/* ============================================
   乾远知产 ChanYond 官网样式 v3.0（仿壹虎大片版式）
   配色：深海蓝 #0a1628-#1a3a5c / 烟金 #b8935a
   字体：Poppins（英文/数据）+ Noto Sans SC（中文正文）+ Noto Serif SC（衬线引文）
   风格：国际品牌大片感 — 直角、深色主导、金色点缀
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  /* 深海蓝色阶 */
  --ot-blue-950: #060e1c;
  --ot-blue-900: #0a1628;
  --ot-blue-800: #0d1f3c;
  --ot-blue-700: #122b50;
  --ot-blue-600: #1a3a5c;
  /* 烟金色阶 */
  --ot-gold-500: #b8935a;
  --ot-gold-400: #c9a76e;
  --ot-gold-300: #d4b98a;
  --ot-gold-100: #f5f0e6;
  --ot-gold-50: #faf7f0;
  /* 信任深蓝绿（DNA Bar 等强调区块）*/
  --ot-green-600: #1a3a5c;
  --ot-green-500: #2c5282;
  --ot-green-100: #e6eef7;
  /* 中性灰（偏冷）*/
  --ot-gray-50: #F4F6F8;
  --ot-gray-100: #E8ECF0;
  --ot-gray-200: #CDD4DB;
  --ot-gray-300: #A0ACB8;
  --ot-gray-400: #7A8A98;
  --ot-gray-500: #5C6C7C;
  --ot-gray-600: #3D4F5F;
  --ot-gray-700: #2A3A48;
  --ot-gray-800: #1A2832;
  --ot-gray-900: #0E1820;
  --ot-white: #FFFFFF;
  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(6,24,36,0.06);
  --shadow: 0 4px 16px rgba(6,24,36,0.08);
  --shadow-md: 0 8px 32px rgba(6,24,36,0.10);
  --shadow-lg: 0 16px 48px rgba(6,24,36,0.14);
  /* 布局 */
  --radius: 6px;
  --radius-btn: 30px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1400px;
  --nav-height: 80px;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  color: var(--ot-gray-800);
  line-height: 1.7;
  background: var(--ot-white);
}

a { text-decoration: none; color: inherit; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", "Poppins", serif;
  font-weight: 600;
}
h1 { font-size: 2.85rem; line-height: 1.25; letter-spacing: 0.01em; font-weight: 700; }
h2 { font-size: 2.05rem; line-height: 1.35; letter-spacing: 0.005em; font-weight: 600; }
h3 { font-size: 1.4rem; line-height: 1.45; font-weight: 600; }
h4 { font-size: 1.15rem; line-height: 1.45; font-weight: 600; letter-spacing: 0.01em; }

.section-label {
  font-family: "Poppins", sans-serif;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ot-gold-500);
  margin-bottom: 14px;
}

.section-title { text-align: center; margin-bottom: 64px; }
.section-title h2 { margin-bottom: 16px; }
.section-title p {
  font-family: "Noto Serif SC", Georgia, serif;
  color: var(--ot-gray-500);
  font-size: 1.05rem;
  font-weight: 300;
  letter-spacing: 0.04em;
  line-height: 1.9;
  max-width: 640px;
  margin: 0 auto;
}

/* Light section title (on dark backgrounds) */
.section-title-light h2 { color: var(--ot-white); }
.section-title-light p { color: rgba(255,255,255,0.6); }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 36px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-btn);
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  letter-spacing: 0.02em;
}
.btn-primary {
  background: var(--ot-gold-500);
  color: var(--ot-white);
  border-color: var(--ot-gold-500);
}
.btn-primary:hover {
  background: var(--ot-gold-400);
  border-color: var(--ot-gold-400);
  box-shadow: 0 4px 20px rgba(184,147,90,0.3);
}
.btn-outline {
  background: transparent;
  color: var(--ot-white);
  border-color: rgba(255,255,255,0.4);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--ot-white);
}
.btn-outline-dark {
  background: transparent;
  color: var(--ot-blue-900);
  border-color: var(--ot-blue-900);
}
.btn-outline-dark:hover {
  background: var(--ot-blue-900);
  color: var(--ot-white);
}
.btn-gold-outline {
  background: transparent;
  color: var(--ot-gold-500);
  border-color: var(--ot-gold-500);
}
.btn-gold-outline:hover {
  background: var(--ot-gold-500);
  color: var(--ot-white);
}
.btn-lg { padding: 16px 48px; font-size: 1.1rem; }
.btn-sm { padding: 10px 24px; font-size: 0.9rem; }

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  transition: var(--transition);
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 1001;
}
.nav-logo img { height: 36px; width: auto; }
.nav-logo-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  line-height: 1.2;
}
.nav-logo-cn {
  font-family: "Noto Sans SC", sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.15em;
}
.nav-logo-en {
  font-family: "Poppins", sans-serif;
  font-weight: 500;
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.7;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--ot-gold-500);
  transition: var(--transition);
}
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }
.nav-links .nav-cta { border: none; }
.nav-links .nav-cta::after { display: none; }

/* Transparent state (homepage hero) */
.navbar-transparent {
  background: transparent;
}
.navbar-transparent .nav-logo-cn,
.navbar-transparent .nav-logo-en { color: var(--ot-white); }
.navbar-transparent .nav-links a { color: rgba(255,255,255,0.85); }
.navbar-transparent .nav-links a:hover { color: var(--ot-white); }
.navbar-transparent .nav-links a.active { color: var(--ot-white); }

/* Scrolled state */
.navbar-scrolled {
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}
.navbar-scrolled .nav-logo-cn,
.navbar-scrolled .nav-logo-en { color: var(--ot-blue-900); }
.navbar-scrolled .nav-links a { color: var(--ot-gray-700); }
.navbar-scrolled .nav-links a:hover { color: var(--ot-blue-900); }
.navbar-scrolled .nav-links a.active { color: var(--ot-blue-900); }

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  z-index: 1001;
  padding: 8px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ot-white);
  transition: var(--transition);
}
.navbar-scrolled .nav-toggle span { background: var(--ot-blue-900); }
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--ot-blue-950);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  opacity: 0.35;
  filter: brightness(0.6);
}
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to right, rgba(6,24,36,0.95) 0%, rgba(6,24,36,0.7) 50%, rgba(6,24,36,0.4) 100%),
    linear-gradient(to top, rgba(6,24,36,0.8) 0%, transparent 40%);
  z-index: 1;
}
.hero .container {
  position: relative;
  z-index: 2;
  padding-top: 120px;
  padding-bottom: 80px;
}
.hero-content { max-width: 700px; }
.hero-logo { height: 56px; width: auto; margin-bottom: 28px; opacity: 0.85; }
.hero-slogan {
  font-family: "Poppins", sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.45em;
  color: var(--ot-gold-400);
  margin-bottom: 24px;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 16px;
}
.hero-slogan::before,
.hero-slogan::after {
  content: '';
  display: block;
  width: 32px;
  height: 1px;
  background: var(--ot-gold-400);
  flex-shrink: 0;
}
.hero h1 {
  color: var(--ot-white);
  margin-bottom: 22px;
  font-size: 3.6rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1.25;
  text-shadow: 0 2px 12px rgba(0,0,0,0.5), 0 6px 40px rgba(0,0,0,0.3);
}
.hero-desc {
  font-family: "Noto Serif SC", Georgia, serif;
  color: rgba(255,255,255,0.75);
  font-size: 1.05rem;
  line-height: 2;
  max-width: 560px;
  margin-bottom: 28px;
  font-weight: 300;
  letter-spacing: 0.05em;
}
.hero-sub {
  margin-bottom: 36px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.hero-sub span {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  border: 1px solid rgba(212,185,138,0.4);
  background: transparent;
  color: rgba(255,255,255,0.82);
  font-size: 0.86rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  border-radius: 999px;
  backdrop-filter: blur(2px);
}
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 48px; }
.hero-brand-mark {
  position: absolute;
  right: 48px;
  bottom: 80px;
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  opacity: 0.18;
}
.hero-brand-mark img {
  width: 64px;
  height: 64px;
}
.hero-brand-cn {
  font-family: "Noto Sans SC", sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.3em;
}
.hero-brand-en {
  font-family: "Poppins", sans-serif;
  font-size: 0.65rem;
  font-weight: 500;
  color: #fff;
  letter-spacing: 0.25em;
  text-transform: uppercase;
}
.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.4);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  animation: bounce 2s infinite;
}
.hero-scroll svg { width: 20px; height: 20px; stroke: currentColor; fill: none; }
@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-8px); }
  60% { transform: translateX(-50%) translateY(-4px); }
}

/* --- Page Header (inner pages) --- */
.page-header {
  position: relative;
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--ot-blue-950);
  overflow: hidden;
}
.page-header-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.35;
}
.page-header::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6,24,36,0.7) 0%, rgba(6,24,36,0.9) 100%);
  z-index: 1;
}
.page-header .container {
  position: relative;
  z-index: 2;
  padding-top: 120px;
  padding-bottom: 80px;
}
.page-header h1 { color: var(--ot-white); margin-bottom: 16px; }
.page-header p { color: rgba(255,255,255,0.6); font-size: 1.15rem; max-width: 600px; margin: 0 auto; }

/* --- Service Page Styles --- */
.service-section { padding: 80px 0; }
.service-section.section-alt { background: var(--ot-gray-50); }

.service-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.service-item {
  background: var(--ot-white);
  border: 1px solid var(--ot-gray-100);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
}
.service-item:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--ot-gold-300);
}
.service-item h4 { margin: 12px 0 8px; }
.service-item .service-desc {
  color: var(--ot-gray-500);
  font-size: 0.9rem;
  margin-bottom: 16px;
  min-height: 1.4em;
}
.service-item .btn { font-size: 0.85rem; padding: 8px 20px; }

.country-badge {
  display: inline-block;
  font-family: "Poppins", sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  width: 56px;
  height: 56px;
  line-height: 56px;
  border-radius: 50%;
  color: var(--ot-white);
  background: var(--ot-blue-700);
  margin: 0 auto;
}
.country-badge.us { background: #1a3a6c; }
.country-badge.eu { background: #003399; }
.country-badge.uk { background: #1a2a5c; }
.country-badge.jp { background: #bc002d; }
.country-badge.kr { background: #003478; }
.country-badge.au { background: #00008B; }
.country-badge.cn { background: #de2910; }
.country-badge.intl { background: var(--ot-gold-500); font-size: 0.85rem; }

.service-note {
  text-align: center;
  margin-top: 32px;
  color: var(--ot-gray-500);
  font-size: 0.92rem;
}
.service-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  margin: 0 auto;
}

/* --- Sections --- */
.section { padding: 120px 0; }
.section-dark {
  background: var(--ot-blue-900);
  color: var(--ot-white);
}
.section-darker {
  background: var(--ot-blue-950);
  color: var(--ot-white);
}
.section-light { background: var(--ot-gray-50); }
.section-green { background: var(--ot-green-600); color: var(--ot-white); }
.section-alt { background: var(--ot-gray-50); }

/* --- Stats Row (cases.html) --- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  text-align: center;
  padding: 40px 0;
}
.stat-item {
  padding: 24px;
}
.stat-number {
  font-family: 'Poppins', 'DM Sans', sans-serif;
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--ot-blue-700);
  line-height: 1.1;
  margin-bottom: 8px;
}
.stat-label {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ot-gray-800);
  margin-bottom: 4px;
}
.stat-note {
  font-size: 0.85rem;
  color: var(--ot-gray-500);
}

/* --- Case Grid (cases.html) --- */
.case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}
.case-card {
  background: var(--ot-white);
  border: 1px solid var(--ot-gray-100);
  border-radius: var(--radius);
  padding: 32px;
  transition: var(--transition);
}
.case-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--ot-gold-300);
}
.case-tag {
  display: inline-block;
  background: var(--ot-blue-50, #eef4ff);
  color: var(--ot-blue-700);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 12px;
}
.case-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--ot-gray-900);
}
.case-meta {
  font-size: 0.9rem;
  color: var(--ot-gray-600);
  line-height: 1.7;
  margin-bottom: 12px;
}
.case-result {
  font-size: 0.9rem;
  color: var(--ot-gray-800);
  background: var(--ot-gray-50);
  padding: 10px 14px;
  border-radius: 6px;
  margin-bottom: 12px;
}
.case-quote {
  font-style: italic;
  font-size: 0.88rem;
  color: var(--ot-gray-500);
  border-left: 3px solid var(--ot-gold-400);
  padding-left: 12px;
  margin-top: 12px;
}

/* --- About Story (about.html) --- */
.about-story {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 48px;
  align-items: start;
}
.story-content h2 {
  font-size: 1.6rem;
  margin-bottom: 20px;
  color: var(--ot-gray-900);
}
.story-content p {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--ot-gray-600);
  margin-bottom: 14px;
}
.founder-card {
  background: var(--ot-white);
  border: 1px solid var(--ot-gray-100);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
}
.founder-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--ot-gray-900);
}
.founder-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--ot-gray-50);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}
.founder-creds {
  list-style: none;
  padding: 0;
  margin: 0 0 16px;
  text-align: left;
}
.founder-creds li {
  font-size: 0.88rem;
  color: var(--ot-gray-600);
  padding: 6px 0;
  border-bottom: 1px solid var(--ot-gray-50);
  position: relative;
  padding-left: 16px;
}
.founder-creds li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--ot-green-600);
  font-weight: 700;
}
.founder-card .founder-quote {
  font-family: 'Noto Serif SC', serif;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--ot-gray-500);
  font-style: italic;
  border: none;
  padding: 12px 0 0;
  margin: 0;
  position: static;
}
.founder-card .founder-quote::before { display: none; }

/* --- Cards Grid (about.html team & network) --- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.card {
  background: var(--ot-white);
  border: 1px solid var(--ot-gray-100);
  border-radius: var(--radius);
  padding: 32px;
  transition: var(--transition);
}
.card:hover {
  box-shadow: var(--shadow-md);
}
.card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--ot-gray-900);
}
.card p {
  font-size: 0.9rem;
  color: var(--ot-gray-600);
  line-height: 1.6;
}
.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.card-icon.blue { background: var(--ot-blue-50, #eef4ff); color: var(--ot-blue-700); }
.card-icon.navy-light { background: #eef1f7; color: var(--ot-blue-900); }
.card-icon.gold-light { background: #fef7e7; color: var(--ot-gold-500); }
.card-icon.amber { background: #fef3cd; color: #d97706; }
.icon-svg-lg { width: 28px; height: 28px; }
.card-icon svg { width: 28px; height: 28px; flex-shrink: 0; }
.card-icon { overflow: hidden; }

/* --- Process Flow (services.html) --- */
.process-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}
.process-step {
  text-align: center;
  padding: 16px 12px;
  min-width: 80px;
}
.process-number {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--ot-blue-700);
  color: var(--ot-white);
  font-family: 'Poppins', 'DM Sans', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 10px;
}
.process-step h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ot-gray-800);
}
.process-arrow {
  color: var(--ot-gray-300);
  font-size: 1.4rem;
  margin-top: -20px;
}

/* --- Brand Gallery (about.html) --- */
.brand-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}
.brand-gallery-item {
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 4/3;
}
.brand-gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* --- Contact Grid (contact.html) --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-info-card {
  background: var(--ot-white);
  border: 1px solid var(--ot-gray-100);
  border-radius: var(--radius);
  padding: 36px;
}
.contact-info-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--ot-gray-900);
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--ot-gray-50);
}
.contact-item:last-child { border-bottom: none; }
.contact-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--ot-blue-50, #eef4ff);
  color: var(--ot-blue-700);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.contact-icon .icon-svg { width: 20px; height: 20px; }
.contact-item h4 {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ot-gray-800);
  margin-bottom: 2px;
}
.contact-item p {
  font-size: 0.9rem;
  color: var(--ot-gray-600);
}
.qrcode-block {
  text-align: center;
  padding: 16px;
  background: var(--ot-gray-50);
  border-radius: var(--radius);
}
.qrcode-block img {
  width: 160px;
  height: 160px;
  object-fit: contain;
  margin-bottom: 8px;
}
.qrcode-block p {
  font-size: 0.8rem;
  color: var(--ot-gray-500);
}

/* --- Contact Form --- */
.contact-form-card {
  background: var(--ot-white);
  border: 1px solid var(--ot-gray-100);
  border-radius: var(--radius);
  padding: 36px;
}
.contact-form-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--ot-gray-900);
}
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--ot-gray-700);
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--ot-gray-200);
  border-radius: 8px;
  font-size: 0.9rem;
  transition: var(--transition);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--ot-blue-700);
  box-shadow: 0 0 0 3px rgba(29,78,216,0.08);
}

/* --- Founder Story --- */
.founder-story {
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 24px;
}
.founder-quote {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.45rem;
  line-height: 2.05;
  color: var(--ot-white);
  font-weight: 400;
  font-style: normal;
  border: none;
  padding: 56px 0 0;
  margin: 0 0 28px;
  position: relative;
  letter-spacing: 0.015em;
}
.founder-quote::before {
  content: '\201C';
  display: block;
  position: absolute;
  top: -8px;
  left: 50%;
  transform: translateX(-50%);
  font-family: 'Georgia', 'Noto Serif SC', serif;
  font-size: 5rem;
  line-height: 1;
  color: var(--ot-gold-500);
  opacity: 0.6;
  font-weight: 400;
}
.founder-meta {
  color: var(--ot-green-400);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 28px;
}
.founder-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}
.founder-tags span {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.8);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.82rem;
  letter-spacing: 0.02em;
}

/* --- Data Wall --- */
.data-wall {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}
.data-item {}
.data-number {
  font-family: "Poppins", sans-serif;
  font-size: 4rem;
  font-weight: 800;
  color: var(--ot-gold-500);
  line-height: 1;
  margin-bottom: 8px;
}
.data-label {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ot-white);
  margin-bottom: 4px;
}
.data-desc {
  font-family: "Noto Serif SC", Georgia, serif;
  font-size: 0.85rem;
  font-weight: 300;
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.03em;
}

/* --- Product Card (homepage preview) --- */
.product-scroll {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 20px;
  padding: 16px 0 32px;
}
.product-scroll::-webkit-scrollbar { height: 4px; }
.product-scroll::-webkit-scrollbar-track { background: var(--ot-gray-100); }
.product-scroll::-webkit-scrollbar-thumb { background: var(--ot-gray-300); border-radius: 2px; }

.product-card {
  background: var(--ot-blue-950);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  border-top: 3px solid transparent;
}
.product-card:hover {
  transform: translateY(-8px);
  border-top-color: var(--ot-gold-500);
  box-shadow: var(--shadow-lg);
}
.product-card-img {
  aspect-ratio: 1/1;
  overflow: hidden;
  background: var(--ot-gray-50);
}
.product-card-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 20px;
  transition: var(--transition);
}
.product-card:hover .product-card-img img { transform: scale(1.05); }
.product-card-info { padding: 20px; }
.product-card-name {
  font-family: "Poppins", sans-serif;
  font-weight: 600;
  color: var(--ot-white);
  font-size: 1rem;
  margin-bottom: 4px;
}
.product-card-desc {
  font-family: "Noto Serif SC", Georgia, serif;
  font-weight: 300;
  color: rgba(255,255,255,0.5);
  font-size: 0.85rem;
  margin-bottom: 12px;
}
.product-card-price {
  font-family: "Poppins", sans-serif;
  font-weight: 700;
  color: var(--ot-gold-500);
  font-size: 1.2rem;
}
.product-card-link {
  display: inline-block;
  margin-top: 12px;
  color: var(--ot-gold-500);
  font-size: 0.9rem;
  font-weight: 500;
}
.product-card-link:hover { color: var(--ot-gold-400); }

/* --- Global Proof (two-column) --- */
.proof-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.proof-list { list-style: none; }
.proof-list li {
  font-family: "Noto Serif SC", Georgia, serif;
  font-weight: 300;
  letter-spacing: 0.03em;
  line-height: 1.85;
  padding: 16px 0;
  padding-left: 20px;
  border-left: 3px solid var(--ot-gold-500);
  margin-bottom: 16px;
  color: rgba(255,255,255,0.82);
  font-size: 0.98rem;
}
.proof-list li strong { color: var(--ot-white); }
.photo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.photo-grid img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: var(--radius);
  transition: var(--transition);
}
.photo-grid img:hover { transform: scale(1.05); opacity: 0.9; }

/* --- Community Gallery (12 images, index.html) --- */
.community-gallery {
  display: grid;
  grid-template-areas:
    "a a b c"
    "a a d e"
    "f g h h"
    "i j h h"
    "k k l l";
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 200px;
  gap: 6px;
}
.community-gallery .gallery-item {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
}
.community-gallery .gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
  display: block;
}
.community-gallery .gallery-item:nth-child(1)  { grid-area: a; }
.community-gallery .gallery-item:nth-child(2)  { grid-area: b; }
.community-gallery .gallery-item:nth-child(3)  { grid-area: c; }
.community-gallery .gallery-item:nth-child(4)  { grid-area: d; }
.community-gallery .gallery-item:nth-child(5)  { grid-area: e; }
.community-gallery .gallery-item:nth-child(6)  { grid-area: f; }
.community-gallery .gallery-item:nth-child(7)  { grid-area: g; }
.community-gallery .gallery-item:nth-child(8)  { grid-area: h; }
.community-gallery .gallery-item:nth-child(9)  { grid-area: i; }
.community-gallery .gallery-item:nth-child(10) { grid-area: j; }
.community-gallery .gallery-item:nth-child(11) { grid-area: k; }
.community-gallery .gallery-item:nth-child(12) { grid-area: l; }

/* --- Community Gallery Small (6 images) --- */
.community-gallery-sm {
  display: grid;
  grid-template-areas:
    "a a b b"
    "a a c c"
    "d e f f";
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 220px;
  gap: 6px;
}
.community-gallery-sm .gallery-item {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
}
.community-gallery-sm .gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
  display: block;
}
.community-gallery-sm .gallery-item:nth-child(1) { grid-area: a; }
.community-gallery-sm .gallery-item:nth-child(2) { grid-area: b; }
.community-gallery-sm .gallery-item:nth-child(3) { grid-area: c; }
.community-gallery-sm .gallery-item:nth-child(4) { grid-area: d; }
.community-gallery-sm .gallery-item:nth-child(5) { grid-area: e; }
.community-gallery-sm .gallery-item:nth-child(6) { grid-area: f; }

.community-gallery .gallery-item img:hover,
.community-gallery-sm .gallery-item img:hover {
  transform: scale(1.06);
  opacity: 0.88;
}
.community-gallery .gallery-item .gallery-caption,
.community-gallery-sm .gallery-item .gallery-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 24px 12px 10px;
  background: linear-gradient(transparent, rgba(0,0,0,0.6));
  color: var(--ot-white);
  font-size: 0.78rem;
  opacity: 0;
  transition: var(--transition);
}
.community-gallery .gallery-item:hover .gallery-caption,
.community-gallery-sm .gallery-item:hover .gallery-caption {
  opacity: 1;
}

/* --- Brand DNA Bar --- */
.dna-bar {
  padding: 48px 0;
}
.dna-bar .container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}
.dna-item {
  text-align: center;
}
.dna-item-en {
  font-family: "Poppins", sans-serif;
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: 0.15em;
  color: var(--ot-white);
  margin-bottom: 4px;
}
.dna-item-cn {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
}
.dna-divider {
  width: 1px;
  height: 40px;
  background: rgba(255,255,255,0.3);
}

/* --- CTA Banner --- */
.cta-banner {
  padding: 96px 0;
  text-align: center;
}
.cta-banner h2 { color: var(--ot-white); margin-bottom: 16px; }
.cta-banner p {
  color: rgba(255,255,255,0.6);
  font-size: 1.05rem;
  margin-bottom: 36px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}
.cta-banner .btn-group { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* --- Footer --- */
.footer {
  background: var(--ot-blue-950);
  padding: 64px 0 32px;
  color: rgba(255,255,255,0.6);
  border-top: 1px solid rgba(255,255,255,0.06);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand-name {
  font-family: "Poppins", sans-serif;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--ot-white);
  margin-bottom: 4px;
}
.footer-brand-sub {
  font-size: 0.85rem;
  margin-bottom: 16px;
  color: rgba(255,255,255,0.4);
}
.footer-brand p {
  font-family: "Noto Serif SC", Georgia, serif;
  font-size: 0.88rem;
  font-weight: 300;
  line-height: 1.85;
  letter-spacing: 0.03em;
  margin-bottom: 16px;
}
.footer h4 {
  color: var(--ot-white);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.footer-links a {
  display: block;
  padding: 6px 0;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
}
.footer-links a:hover { color: var(--ot-gold-500); }
.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.35);
}

/* --- Timeline --- */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--ot-gold-500), var(--ot-green-600));
  transform: translateX(-50%);
}
.timeline-item {
  position: relative;
  padding: 24px 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
}
.timeline-item:nth-child(odd) .timeline-content { grid-column: 1; text-align: right; }
.timeline-item:nth-child(odd) .timeline-year { grid-column: 2; }
.timeline-item:nth-child(even) .timeline-year { grid-column: 1; text-align: right; }
.timeline-item:nth-child(even) .timeline-content { grid-column: 2; }
.timeline-dot {
  position: absolute;
  left: 50%;
  top: 32px;
  width: 16px;
  height: 16px;
  background: var(--ot-gold-500);
  border: 3px solid var(--ot-blue-950);
  transform: translateX(-50%);
  z-index: 2;
}
.timeline-year {
  font-family: "Poppins", sans-serif;
  font-size: 2rem;
  font-weight: 800;
  color: var(--ot-gold-500);
}
.timeline-content h3 {
  color: var(--ot-white);
  font-size: 1.1rem;
  margin-bottom: 8px;
}
.timeline-content p {
  color: rgba(255,255,255,0.6);
  font-size: 0.95rem;
}

/* --- DNA Cards --- */
.dna-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.dna-card {
  background: rgba(255,255,255,0.04);
  border-top: 3px solid var(--ot-gold-500);
  padding: 40px 32px;
  transition: var(--transition);
}
.dna-card:hover {
  background: rgba(255,255,255,0.08);
  box-shadow: 0 8px 32px rgba(184,147,90,0.1);
}
.dna-card-icon {
  width: 56px;
  height: 56px;
  background: rgba(184,147,90,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.dna-card-icon svg {
  width: 28px;
  height: 28px;
  stroke: var(--ot-gold-500);
  fill: none;
  stroke-width: 1.5;
}
.dna-card h3 { color: var(--ot-white); margin-bottom: 12px; }
.dna-card p {
  font-family: "Noto Serif SC", Georgia, serif;
  color: rgba(255,255,255,0.6);
  font-size: 0.92rem;
  font-weight: 300;
  letter-spacing: 0.03em;
  line-height: 1.9;
}

/* --- Two Column (Image + Text) --- */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.two-col-reverse { direction: rtl; }
.two-col-reverse > * { direction: ltr; }
.two-col-img {
  overflow: hidden;
  border-radius: var(--radius);
}
.two-col-img img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  transition: var(--transition);
}
.two-col-img:hover img { transform: scale(1.03); }
.two-col-text h3 { margin-bottom: 16px; }
.two-col-text p { margin-bottom: 16px; color: rgba(255,255,255,0.7); }

/* Blockquote */
.brand-quote {
  border-left: 3px solid var(--ot-gold-500);
  padding-left: 20px;
  margin-top: 24px;
  font-family: "Poppins", sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--ot-gold-500);
  font-style: italic;
}

/* --- User Persona --- */
.persona-grid {
  display: grid;
  gap: 80px;
}
.persona-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.persona-item:nth-child(even) { direction: rtl; }
.persona-item:nth-child(even) > * { direction: ltr; }
.persona-img {
  overflow: hidden;
  border-radius: var(--radius);
}
.persona-img img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}
.persona-tag {
  display: inline-block;
  background: var(--ot-gold-500);
  color: var(--ot-white);
  font-family: "Poppins", sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 12px;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}
.persona-text h3 { color: var(--ot-blue-900); margin-bottom: 12px; }
.persona-text p { color: var(--ot-gray-500); }

/* --- Product Detail (products.html) --- */
.product-nav {
  position: sticky;
  top: var(--nav-height);
  z-index: 99;
  background: var(--ot-blue-950);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  overflow-x: auto;
  scrollbar-width: none;
}
.product-nav::-webkit-scrollbar { display: none; }
.product-nav .container {
  display: flex;
  gap: 8px;
  padding-top: 12px;
  padding-bottom: 12px;
}
.product-nav a {
  flex-shrink: 0;
  padding: 8px 20px;
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(255,255,255,0.5);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: var(--transition);
}
.product-nav a:hover { color: rgba(255,255,255,0.8); }
.product-nav a.active {
  color: var(--ot-gold-500);
  border-bottom-color: var(--ot-gold-500);
}

.product-detail {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 64px;
  align-items: start;
}

/* Product image gallery */
.product-gallery {}
.product-main-img {
  width: 100%;
  aspect-ratio: 4/3;
  overflow: hidden;
  background: var(--ot-gray-50);
  margin-bottom: 12px;
}
.product-main-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 16px;
}
.product-thumbs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.product-thumb {
  flex: 0 0 72px;
  height: 72px;
  overflow: hidden;
  cursor: pointer;
  opacity: 0.5;
  border: 2px solid transparent;
  transition: var(--transition);
  background: var(--ot-gray-50);
}
.product-thumb:hover { opacity: 0.8; }
.product-thumb.active {
  opacity: 1;
  border-color: var(--ot-gold-500);
}
.product-thumb img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 4px;
}

/* Product info */
.product-info {}
.product-sku {
  display: inline-block;
  border: 1px solid var(--ot-gold-500);
  color: var(--ot-gold-500);
  font-family: "Poppins", sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 10px;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}
.product-info h2 { margin-bottom: 4px; }
.product-info .product-en {
  font-family: "Poppins", sans-serif;
  font-size: 0.9rem;
  color: var(--ot-gray-400);
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.product-price {
  font-family: "Poppins", sans-serif;
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--ot-gold-500);
  margin-bottom: 20px;
}
.product-price small {
  font-size: 1rem;
  font-weight: 500;
  color: var(--ot-gray-400);
  margin-right: 4px;
}
.product-desc {
  color: var(--ot-gray-500);
  font-size: 1rem;
  margin-bottom: 24px;
  line-height: 1.7;
}
.product-features { margin-bottom: 32px; }
.product-features li {
  padding: 10px 0 10px 20px;
  border-left: 3px solid var(--ot-gold-500);
  margin-bottom: 8px;
  font-size: 0.95rem;
  color: var(--ot-gray-700);
}
.product-buy-tip {
  font-size: 0.85rem;
  color: var(--ot-gray-400);
  margin-top: 12px;
}

/* --- 7SPI Section (craftsmanship) --- */
.spi-hero { text-align: center; padding: 120px 0; }
.spi-number {
  font-family: "Poppins", sans-serif;
  font-size: 8rem;
  font-weight: 800;
  color: var(--ot-gold-500);
  line-height: 1;
  margin-bottom: 8px;
}
.spi-unit {
  font-family: "Poppins", sans-serif;
  font-size: 2rem;
  font-weight: 600;
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.2em;
  margin-bottom: 24px;
}
.spi-subtitle {
  font-size: 1.2rem;
  color: rgba(255,255,255,0.7);
  max-width: 600px;
  margin: 0 auto 48px;
}
.spi-explain {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.5);
  max-width: 500px;
  margin: 0 auto 48px;
}

/* SPI comparison bars */
.spi-bars { max-width: 500px; margin: 0 auto; }
.spi-bar-item { margin-bottom: 20px; }
.spi-bar-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: 6px;
  font-size: 0.9rem;
}
.spi-bar-label span:first-child { color: rgba(255,255,255,0.7); }
.spi-bar-label span:last-child {
  font-family: "Poppins", sans-serif;
  font-weight: 700;
}
.spi-bar-track {
  height: 8px;
  background: rgba(255,255,255,0.1);
  overflow: hidden;
}
.spi-bar-fill {
  height: 100%;
  transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1);
  width: 0;
}
.spi-bar-fill.revealed { width: var(--bar-width); }
.spi-bar-item:nth-child(1) .spi-bar-fill { background: var(--ot-gray-500); }
.spi-bar-item:nth-child(2) .spi-bar-fill { background: var(--ot-blue-600); }
.spi-bar-item:nth-child(3) .spi-bar-fill { background: var(--ot-gold-500); }
.spi-bar-item:nth-child(3) .spi-bar-label span:last-child { color: var(--ot-gold-500); }

/* --- Material Cards --- */
.material-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.material-card {
  background: var(--ot-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.material-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.material-card-img {
  aspect-ratio: 16/10;
  overflow: hidden;
}
.material-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.material-card-body { padding: 28px 24px; }
.material-card-body h3 { margin-bottom: 12px; color: var(--ot-blue-900); }
.material-card-body p { color: var(--ot-gray-500); font-size: 0.95rem; }

/* --- Awards Section --- */
.awards-center { text-align: center; margin-bottom: 48px; }
.award-badge {
  display: inline-block;
  border: 2px solid var(--ot-gold-500);
  padding: 16px 32px;
  margin-bottom: 16px;
}
.award-badge h3 { color: var(--ot-gold-500); font-size: 1.2rem; }
.award-badge p { color: rgba(255,255,255,0.5); font-size: 0.85rem; margin-top: 4px; }
.events-list {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.events-list span {
  color: rgba(255,255,255,0.6);
  font-size: 0.95rem;
  padding-left: 16px;
  border-left: 2px solid var(--ot-gold-500);
}

/* --- FAQ --- */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--ot-gray-200);
  margin-bottom: 8px;
  transition: var(--transition);
}
.faq-item.active { border-color: var(--ot-gold-500); box-shadow: var(--shadow); }
.faq-question {
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  color: var(--ot-gray-800);
}
.faq-question:hover { color: var(--ot-blue-900); }
.faq-arrow {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  transition: var(--transition);
  flex-shrink: 0;
}
.faq-item.active .faq-arrow { transform: rotate(180deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-item.active .faq-answer { max-height: 600px; }
.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--ot-gray-500);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* --- Scroll Reveal (disabled - show immediately) --- */
.reveal {
  opacity: 1;
  transform: none;
}
.reveal.revealed {
  opacity: 1;
  transform: none;
}

/* --- Mobile CTA (fixed bottom) --- */
.mobile-cta {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 998;
  padding: 12px 16px;
  padding-bottom: calc(12px + env(safe-area-inset-bottom, 0px));
  background: var(--ot-blue-950);
  border-top: 1px solid rgba(255,255,255,0.1);
}
.mobile-cta .btn { width: 100%; }

/* ============================================
   Knowledge Hub — 户外知识库
   ============================================ */

/* --- Category Filter --- */
.knowledge-filter {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.filter-btn {
  display: inline-flex;
  align-items: center;
  padding: 10px 24px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-btn);
  border: 2px solid var(--ot-gray-300);
  background: transparent;
  color: var(--ot-gray-600);
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.filter-btn:hover {
  border-color: var(--ot-gold-500);
  color: var(--ot-gold-500);
}
.filter-btn.active {
  background: var(--ot-gold-500);
  border-color: var(--ot-gold-500);
  color: var(--ot-white);
}

/* --- Article Card Grid --- */
.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.article-card {
  position: relative;
  background: var(--ot-white);
  border-radius: var(--radius);
  overflow: hidden;
  border-top: 3px solid transparent;
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.article-card:hover {
  transform: translateY(-8px);
  border-top-color: var(--ot-gold-500);
  box-shadow: var(--shadow-lg);
}
.article-card-tag {
  display: inline-block;
  margin: 20px 0 0 24px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--ot-white);
}
/* When card has image, overlay the tag */
.article-card-img + .article-card-tag,
.article-card .article-card-img ~ .article-card-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
  margin: 0;
}
.article-card-tag[data-cat="recommend"] { background: var(--ot-gold-500); }
.article-card-tag[data-cat="compare"]   { background: var(--ot-green-600); }
.article-card-tag[data-cat="guide"]     { background: var(--ot-blue-600); }
.article-card-tag[data-cat="review"]    { background: var(--ot-blue-700); }

.article-card-img {
  aspect-ratio: 16/10;
  overflow: hidden;
  background: var(--ot-gray-100);
}
.article-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}
.article-card:hover .article-card-img img { transform: scale(1.05); }

.article-card-body { padding: 24px; }
.article-card-body h3 {
  font-family: "Poppins", "Noto Sans SC", sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--ot-gray-800);
  margin-bottom: 8px;
  line-height: 1.4;
}
.article-card-body p {
  font-family: "Noto Serif SC", Georgia, serif;
  font-weight: 300;
  font-size: 0.9rem;
  color: var(--ot-gray-500);
  line-height: 1.7;
  letter-spacing: 0.03em;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 12px;
}
.article-card-meta {
  font-size: 0.82rem;
  color: var(--ot-gray-400);
  display: flex;
  align-items: center;
  gap: 12px;
}

/* --- Empty State --- */
.knowledge-empty {
  text-align: center;
  padding: 80px 24px;
  border: 2px dashed var(--ot-gray-200);
}
.knowledge-empty h3 {
  color: var(--ot-gray-500);
  margin-bottom: 8px;
}
.knowledge-empty p {
  color: var(--ot-gray-400);
  font-size: 0.95rem;
}

/* --- Breadcrumb --- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--ot-gray-400);
  padding: calc(var(--nav-height) + 24px) 0 0;
  margin-bottom: 32px;
}
.breadcrumb a { color: var(--ot-gray-400); }
.breadcrumb a:hover { color: var(--ot-gold-500); }
.breadcrumb .breadcrumb-sep { color: var(--ot-gray-300); }
.breadcrumb .breadcrumb-current { color: var(--ot-gray-600); font-weight: 500; }

/* --- Article Header --- */
.article-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 48px;
}
.article-category-tag {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ot-white);
  margin-bottom: 16px;
}
.article-category-tag[data-cat="recommend"] { background: var(--ot-gold-500); }
.article-category-tag[data-cat="compare"]   { background: var(--ot-green-600); }
.article-category-tag[data-cat="guide"]     { background: var(--ot-blue-600); }
.article-category-tag[data-cat="review"]    { background: var(--ot-blue-700); }

.article-header h1 {
  font-size: 2.4rem;
  color: var(--ot-gray-800);
  margin-bottom: 16px;
}
.article-lead {
  font-family: "Noto Serif SC", Georgia, serif;
  font-size: 1.1rem;
  font-weight: 300;
  color: var(--ot-gray-500);
  line-height: 1.9;
  letter-spacing: 0.04em;
  max-width: 640px;
  margin: 0 auto 16px;
}
.article-meta {
  font-size: 0.85rem;
  color: var(--ot-gray-400);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

/* --- Article Layout (TOC + Content) --- */
.article-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 48px;
  max-width: var(--max-width);
  margin: 0 auto;
}

/* TOC Sidebar */
.article-toc {
  position: sticky;
  top: calc(var(--nav-height) + 24px);
  align-self: start;
  padding-left: 20px;
  border-left: 2px solid var(--ot-gray-200);
}
.article-toc h4 {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ot-gray-400);
  margin-bottom: 16px;
}
.article-toc ol { list-style: none; }
.article-toc li { margin-bottom: 8px; }
.article-toc a {
  display: block;
  font-size: 0.88rem;
  color: var(--ot-gray-500);
  padding: 4px 0 4px 12px;
  border-left: 2px solid transparent;
  margin-left: -22px;
  transition: var(--transition);
}
.article-toc a:hover { color: var(--ot-blue-900); }
.article-toc a.active {
  color: var(--ot-gold-500);
  border-left-color: var(--ot-gold-500);
  font-weight: 600;
}

/* Article Content Typography */
.article-content { max-width: 780px; }
.article-content h2 {
  font-size: 1.6rem;
  color: var(--ot-blue-900);
  margin-top: 48px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ot-gray-100);
}
.article-content h3 {
  font-size: 1.2rem;
  color: var(--ot-gray-800);
  margin-top: 32px;
  margin-bottom: 12px;
}
.article-content p {
  color: var(--ot-gray-600);
  font-size: 1rem;
  line-height: 1.85;
  margin-bottom: 16px;
}
.article-content ul,
.article-content ol {
  padding-left: 24px;
  margin-bottom: 16px;
}
.article-content ul { list-style: disc; }
.article-content ol { list-style: decimal; }
.article-content li {
  color: var(--ot-gray-600);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 6px;
}
.article-content blockquote {
  border-left: 4px solid var(--ot-gold-500);
  padding: 16px 20px;
  margin: 24px 0;
  background: var(--ot-gold-50);
  font-family: "Noto Serif SC", Georgia, serif;
  font-weight: 300;
  color: var(--ot-gray-700);
  font-size: 0.95rem;
  line-height: 1.85;
}

/* Article Table */
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.92rem;
}
.article-content th,
.article-content td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--ot-gray-100);
}
.article-content th {
  background: var(--ot-blue-950);
  color: var(--ot-white);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.03em;
}
.article-content tr:nth-child(even) { background: var(--ot-gray-50); }

/* Data Callout */
.data-callout {
  background: var(--ot-blue-950);
  color: var(--ot-white);
  padding: 24px 28px;
  margin: 24px 0;
}
.data-callout .data-callout-number {
  font-family: "Poppins", sans-serif;
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--ot-gold-500);
  line-height: 1.1;
}
.data-callout .data-callout-text {
  font-size: 0.92rem;
  color: rgba(255,255,255,0.7);
  margin-top: 4px;
}

/* Article Verdict / Conclusion Box */
.article-verdict {
  border-left: 4px solid var(--ot-gold-500);
  padding: 20px 24px;
  margin: 32px 0;
  background: var(--ot-gold-50);
}
.article-verdict h3 {
  margin-top: 0;
  color: var(--ot-blue-900);
}

/* Related Articles */
.related-articles { margin-top: 64px; }
.related-articles .section-title { margin-bottom: 32px; }

/* ============================
   Responsive
   ============================ */
@media (max-width: 1024px) {
  .data-wall { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .proof-grid { grid-template-columns: 1fr; gap: 48px; }
  .dna-cards { grid-template-columns: repeat(2, 1fr); }
  .two-col,
  .persona-item { grid-template-columns: 1fr; gap: 32px; }
  .two-col-reverse { direction: ltr; }
  .persona-item:nth-child(even) { direction: ltr; }
  .product-detail { grid-template-columns: 1fr; gap: 32px; }
  .footer-grid { grid-template-columns: 1fr 1fr 1fr 1fr; gap: 32px; }
  .material-cards { grid-template-columns: repeat(2, 1fr); }
  .knowledge-grid { grid-template-columns: repeat(2, 1fr); }
  .article-layout { grid-template-columns: 1fr; }
  .article-toc { display: none; }
  .timeline::before { left: 24px; }
  .timeline-item { grid-template-columns: 1fr; padding-left: 56px; }
  .timeline-item:nth-child(odd) .timeline-content,
  .timeline-item:nth-child(even) .timeline-content { grid-column: 1; text-align: left; }
  .timeline-item:nth-child(odd) .timeline-year,
  .timeline-item:nth-child(even) .timeline-year { grid-column: 1; text-align: left; }
  .timeline-dot { left: 24px; }
}

@media (max-width: 768px) {
  html { font-size: 15px; }
  h1 { font-size: 2.2rem; }
  h2 { font-size: 1.8rem; }
  .section { padding: 80px 0; }
  .section-title { margin-bottom: 40px; }

  /* Nav mobile */
  .nav-links {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: var(--ot-blue-950);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 24px;
    z-index: 999;
    padding: 100px 32px 32px;
  }
  .nav-links.open { display: flex; }
  .nav-links a {
    font-size: 1.2rem;
    color: rgba(255,255,255,0.85) !important;
  }
  .nav-toggle { display: flex; }
  .nav-toggle.active span { background: var(--ot-white) !important; }

  /* Hero */
  .hero { min-height: 100vh; }
  .hero .container { padding-top: 140px; }
  .hero-btns { flex-direction: column; }
  .hero-btns .btn { width: 100%; }
  .hero-sub { flex-direction: column; gap: 8px; }
  .hero-scroll { display: none; }

  /* Page header */
  .page-header { min-height: 50vh; }

  /* Data wall */
  .data-wall { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .data-number { font-size: 2.8rem; }

  /* Products */
  .product-scroll { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 12px; }
  .product-detail { grid-template-columns: 1fr; }

  /* DNA */
  .dna-bar .container { flex-direction: column; gap: 20px; }
  .dna-divider { width: 40px; height: 1px; }
  .dna-cards { grid-template-columns: 1fr; }

  /* Photo grid */
  .photo-grid { grid-template-columns: repeat(2, 1fr); }
  .community-gallery,
  .community-gallery-sm {
    grid-template-areas: none;
    grid-template-columns: repeat(2, 1fr);
    grid-auto-rows: 180px;
  }
  .community-gallery .gallery-item,
  .community-gallery .gallery-item:nth-child(n),
  .community-gallery-sm .gallery-item,
  .community-gallery-sm .gallery-item:nth-child(n) {
    grid-column: auto;
    grid-row: auto;
    grid-area: auto;
  }
  .community-gallery .gallery-item .gallery-caption,
  .community-gallery-sm .gallery-item .gallery-caption { opacity: 1; }

  /* Footer */
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }

  /* Material cards */
  .material-cards { grid-template-columns: 1fr; }

  /* Knowledge Hub */
  .knowledge-grid { grid-template-columns: 1fr; }
  .knowledge-filter { justify-content: flex-start; overflow-x: auto; flex-wrap: nowrap; }
  .article-header h1 { font-size: 1.8rem; }

  /* SPI */
  .spi-number { font-size: 5rem; }

  /* Mobile CTA */
  .mobile-cta { display: block; }
  body { padding-bottom: 72px; }

  /* Persona */
  .persona-item { grid-template-columns: 1fr; gap: 24px; }
  .persona-item:nth-child(even) { direction: ltr; }
}

/* --- Markets & Industries (homepage) --- */
.markets-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.market-card {
  position: relative;
  text-align: center;
  padding: 40px 22px 32px;
  border: 1px solid var(--ot-gray-100);
  background: var(--ot-white);
  border-radius: var(--radius);
  transition: var(--transition);
  overflow: hidden;
}
.market-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--ot-gold-500), var(--ot-gold-300));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.market-card:hover {
  border-color: var(--ot-gold-300);
  box-shadow: 0 12px 36px rgba(10,22,40,0.08);
  transform: translateY(-4px);
}
.market-card:hover::before { transform: scaleX(1); }
.market-code {
  font-family: "Poppins", sans-serif;
  font-size: 2.1rem;
  font-weight: 700;
  color: var(--ot-blue-900);
  letter-spacing: 0.03em;
  line-height: 1;
  margin-bottom: 12px;
  transition: var(--transition);
}
.market-card:hover .market-code { color: var(--ot-gold-500); }
.market-name {
  font-family: "Noto Serif SC", serif;
  font-size: 1.02rem;
  font-weight: 500;
  color: var(--ot-gray-800);
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}
.market-desc {
  font-family: "Poppins", sans-serif;
  font-size: 0.68rem;
  color: var(--ot-gray-400);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  line-height: 1.6;
}

.industry-tags-title {
  text-align: center;
  margin: 64px 0 20px;
  font-family: "Poppins", sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.3em;
  color: var(--ot-gray-400);
  text-transform: uppercase;
}
.industry-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  max-width: 880px;
  margin: 0 auto;
}
.industry-tags span {
  padding: 8px 18px;
  border: 1px solid var(--ot-gray-200);
  background: var(--ot-white);
  color: var(--ot-gray-700);
  font-family: "Noto Serif SC", serif;
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  border-radius: 999px;
  transition: var(--transition);
}
.industry-tags span:hover {
  border-color: var(--ot-gold-400);
  color: var(--ot-gold-500);
  background: var(--ot-gold-50);
  transform: translateY(-2px);
}

@media (max-width: 768px) {
  .markets-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .market-card { padding: 24px 14px; }
  .market-code { font-size: 1.6rem; }
}

/* --- Footer Contact (homepage) --- */
.footer-contact { display: flex; flex-direction: column; gap: 12px; }
.footer-contact-item {
  display: flex;
  gap: 12px;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.55;
}
.footer-contact-item a:hover { color: var(--ot-gold-500); }
.footer-contact-label {
  flex-shrink: 0;
  width: 32px;
  font-family: "Poppins", sans-serif;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ot-gold-500);
  padding-top: 2px;
}
.footer-qr {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
  padding-top: 16px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.footer-qr img {
  width: 110px;
  height: 110px;
  background: var(--ot-white);
  padding: 6px;
  border-radius: 4px;
}
.footer-qr span {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.65);
  line-height: 1.6;
  letter-spacing: 0.04em;
}
.footer-bottom a { color: rgba(255,255,255,0.45); }
.footer-bottom a:hover { color: var(--ot-gold-500); }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col ul li { margin-bottom: 8px; font-size: 0.88rem; color: rgba(255,255,255,0.6); }
.footer-col ul li a { color: rgba(255,255,255,0.6); text-decoration: none; transition: var(--transition); }
.footer-col ul li a:hover { color: var(--ot-gold-500); }
.footer-qr p { font-size: 0.8rem; color: rgba(255,255,255,0.5); margin-top: 6px; }

/* --- Logo Wall (cases.html) --- */
.logo-wall {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 24px;
  align-items: center;
}
.logo-wall-item {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  background: var(--ot-gray-50);
  border-radius: 8px;
  height: 80px;
}
.logo-wall-item img {
  max-width: 100%;
  max-height: 48px;
  object-fit: contain;
  filter: grayscale(0.3);
  opacity: 0.8;
  transition: var(--transition);
}
.logo-wall-item:hover img {
  filter: grayscale(0);
  opacity: 1;
}

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr !important; gap: 32px; }
}

/* --- Articles Page --- */
.article-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  padding: 32px 0 8px;
}
.filter-btn {
  padding: 8px 22px;
  border: 1px solid var(--ot-gray-200);
  background: var(--ot-white);
  color: var(--ot-gray-600);
  font-family: "Noto Serif SC", serif;
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  border-radius: 999px;
  cursor: pointer;
  transition: var(--transition);
}
.filter-btn:hover {
  border-color: var(--ot-gold-400);
  color: var(--ot-gold-500);
  transform: translateY(-1px);
}
.filter-btn.active {
  background: var(--ot-blue-900);
  border-color: var(--ot-blue-900);
  color: var(--ot-white);
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 28px;
}
.article-card { grid-column: span 2; }
.article-card-featured { grid-column: span 3; }
.article-card-hero { grid-column: span 6; }
.article-card-hero .article-card-body { padding: 56px 56px 48px; max-width: 880px; }
.article-card-hero h3 { font-size: 2rem !important; line-height: 1.45 !important; }
.article-card-hero .article-card-body p { font-size: 1.05rem !important; }
@media (max-width: 1024px) {
  .article-card { grid-column: span 3; }
  .article-card-featured { grid-column: span 6; }
  .article-card-hero { grid-column: span 6; }
  .article-card-hero .article-card-body { padding: 36px 28px 28px; }
  .article-card-hero h3 { font-size: 1.5rem !important; }
}
@media (max-width: 640px) {
  .article-card { grid-column: span 6; }
}
.article-card {
  position: relative;
  background: var(--ot-white);
  border: 1px solid var(--ot-gray-100);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}
.article-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--ot-gold-500), var(--ot-gold-300));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.article-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(10,22,40,0.08);
  border-color: var(--ot-gold-300);
}
.article-card:hover::before { transform: scaleX(1); }

.article-card-tag {
  position: absolute;
  top: 18px;
  right: 18px;
  font-family: "Poppins", sans-serif;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ot-gold-500);
  background: var(--ot-gold-50);
  padding: 4px 10px;
  border-radius: 4px;
}
.article-card-body {
  padding: 32px 24px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.article-card-meta {
  font-family: "Poppins", sans-serif;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--ot-gray-400);
  text-transform: uppercase;
  margin-bottom: 14px;
}
.article-card h3 {
  font-family: "Noto Serif SC", serif;
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--ot-blue-900);
  margin-bottom: 14px;
  letter-spacing: 0.01em;
}
.article-card-body p {
  font-size: 0.92rem;
  color: var(--ot-gray-500);
  line-height: 1.85;
  margin-bottom: 20px;
  flex: 1;
}
.article-card-link {
  font-family: "Poppins", sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ot-gold-500);
  letter-spacing: 0.04em;
  margin-top: auto;
}
.article-card:hover .article-card-link { color: var(--ot-gold-400); }

@media (max-width: 1024px) {
  .article-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
}
@media (max-width: 640px) {
  .article-grid { grid-template-columns: 1fr; }
  .article-filters { padding: 16px 0; }
}

/* --- Featured Article (置顶头条) --- */
.article-card-featured {
  background: linear-gradient(135deg, var(--ot-blue-900) 0%, var(--ot-blue-800) 100%);
  border-color: var(--ot-blue-700);
  position: relative;
}
.article-card-featured::before {
  background: linear-gradient(90deg, var(--ot-gold-400), var(--ot-gold-500), var(--ot-gold-300));
  transform: scaleX(1);
  height: 4px;
}
.article-card-featured:hover {
  border-color: var(--ot-gold-400);
  box-shadow: 0 24px 56px rgba(10,22,40,0.35);
}
.article-card-featured .article-card-body { padding: 48px 40px 40px; }
.article-card-featured h3 {
  font-size: 1.7rem;
  line-height: 1.5;
  color: var(--ot-white);
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}
.article-card-featured .article-card-meta {
  color: var(--ot-gold-400);
  font-weight: 600;
}
.article-card-featured .article-card-body p {
  color: rgba(255,255,255,0.72);
  font-size: 1rem;
  line-height: 1.95;
  font-family: "Noto Serif SC", serif;
  font-weight: 300;
}
.article-card-featured .article-card-link {
  color: var(--ot-gold-400);
  font-size: 0.95rem;
}
.article-card-featured:hover .article-card-link { color: var(--ot-gold-300); }

.tag-featured {
  background: var(--ot-gold-500) !important;
  color: var(--ot-white) !important;
  padding: 5px 14px !important;
  font-weight: 700 !important;
  letter-spacing: 0.1em !important;
  box-shadow: 0 2px 12px rgba(184,147,90,0.4);
}

@media (max-width: 1024px) {
  .article-card-featured { grid-column: span 2; }
  .article-card-featured h3 { font-size: 1.4rem; }
  .article-card-featured .article-card-body { padding: 36px 28px 28px; }
}
@media (max-width: 640px) {
  .article-card-featured { grid-column: span 1; }
  .article-card-featured h3 { font-size: 1.2rem; }
}

/* --- Article Detail Page (long-form reading) --- */
.article-page { padding: 140px 0 80px; }
.article-page-header {
  max-width: 800px;
  margin: 0 auto 56px;
  text-align: center;
  padding: 0 24px;
}
.article-page-tag {
  display: inline-block;
  background: var(--ot-gold-500);
  color: var(--ot-white);
  font-family: "Poppins", sans-serif;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 5px 14px;
  border-radius: 4px;
  margin-bottom: 20px;
}
.article-page-title {
  font-family: "Noto Serif SC", serif;
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ot-blue-900);
  margin-bottom: 24px;
  letter-spacing: 0.01em;
}
.article-page-meta {
  font-family: "Poppins", sans-serif;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: var(--ot-gray-400);
  text-transform: uppercase;
}
.article-page-meta span { margin: 0 12px; }
.article-page-divider {
  width: 60px;
  height: 2px;
  background: var(--ot-gold-500);
  margin: 32px auto;
}

.article-content {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
  font-family: "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
  font-size: 1.05rem;
  line-height: 2;
  color: var(--ot-gray-700);
  font-weight: 400;
}
.article-content > p { margin-bottom: 1.6em; letter-spacing: 0.02em; }
.article-content h2 {
  font-family: "Noto Serif SC", serif;
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--ot-blue-900);
  margin: 2.4em 0 0.8em;
  padding-left: 14px;
  border-left: 4px solid var(--ot-gold-500);
  line-height: 1.5;
}
.article-content h3 {
  font-family: "Noto Serif SC", serif;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--ot-blue-800);
  margin: 1.8em 0 0.6em;
  line-height: 1.55;
}
.article-content h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ot-blue-800);
  margin: 1.4em 0 0.5em;
}
.article-content strong { color: var(--ot-blue-900); font-weight: 700; }
.article-content em { color: var(--ot-gold-600, #8b6f43); font-style: normal; font-weight: 600; }
.article-content blockquote {
  margin: 2em 0;
  padding: 20px 28px;
  border-left: 4px solid var(--ot-gold-500);
  background: var(--ot-gold-50);
  font-family: "Noto Serif SC", serif;
  font-size: 1rem;
  color: var(--ot-gray-700);
  font-style: normal;
}
.article-content ul, .article-content ol {
  margin: 1em 0 1.6em;
  padding-left: 1.5em;
}
.article-content ul li, .article-content ol li {
  margin-bottom: 0.6em;
  list-style-position: outside;
  list-style-type: disc;
}
.article-content ol li { list-style-type: decimal; }
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.6em 0;
  font-size: 0.95rem;
  font-family: "Noto Sans SC", sans-serif;
}
.article-content table th,
.article-content table td {
  padding: 12px 16px;
  border: 1px solid var(--ot-gray-200);
  text-align: left;
  line-height: 1.6;
}
.article-content table th {
  background: var(--ot-blue-900);
  color: var(--ot-white);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.article-content table tr:nth-child(even) { background: var(--ot-gray-50); }
.article-content code {
  background: var(--ot-gray-100);
  color: var(--ot-blue-900);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.9em;
}
.article-content hr {
  border: 0;
  height: 1px;
  background: var(--ot-gray-200);
  margin: 2.4em 0;
}
.article-content .key-points {
  background: linear-gradient(135deg, var(--ot-blue-900) 0%, var(--ot-blue-800) 100%);
  color: var(--ot-white);
  padding: 32px 36px;
  border-radius: var(--radius);
  margin: 2.4em 0;
  font-family: "Noto Sans SC", sans-serif;
}
.article-content .key-points h4 {
  color: var(--ot-gold-400);
  font-family: "Poppins", sans-serif;
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin: 0 0 16px;
}
.article-content .key-points ul li {
  color: rgba(255,255,255,0.85);
  margin-bottom: 0.8em;
  list-style-type: none;
  padding-left: 24px;
  position: relative;
}
.article-content .key-points ul li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--ot-gold-400);
  font-weight: 700;
}
.article-content .article-disclaimer {
  margin-top: 3em;
  padding: 20px 24px;
  background: var(--ot-gray-50);
  border: 1px solid var(--ot-gray-200);
  border-radius: var(--radius);
  font-size: 0.88rem;
  color: var(--ot-gray-500);
  line-height: 1.85;
}
.article-back {
  max-width: 760px;
  margin: 48px auto 0;
  padding: 0 24px;
}
.article-back a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: "Poppins", sans-serif;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  color: var(--ot-gold-500);
  font-weight: 600;
}
.article-back a:hover { color: var(--ot-gold-400); }

@media (max-width: 768px) {
  .article-page-title { font-size: 1.6rem; }
  .article-content { font-size: 1rem; }
  .article-content h2 { font-size: 1.25rem; }
}