/* ===== AI推荐 — 亮色主题，风格对齐 localhost:3009 ===== */

/* ---- 变量 ---- */
:root {
  --primary:        #2563EB;
  --primary-dark:   #1E40AF;
  --primary-light:  #3B82F6;
  --primary-bg:     #EFF6FF;
  --primary-border: #DBEAFE;

  --bg:        #FFFFFF;
  --bg-soft:   #FFFFFF;
  --surface:   #FFFFFF;

  --text:       #2D3435;
  --text-sub:   #596061;
  --text-muted: #94A3B8;
  --text-sec:   #64748B;

  --border:       #F1F5F9;
  --border-card:  #E2E8F0;

  --radius-sm:  8px;
  --radius:     12px;
  --radius-lg:  16px;
  --radius-xl:  20px;

  --header-h:   64px;
  --container:  1200px;

  --shadow-nav:   0 10px 40px rgba(25, 27, 35, 0.04);
  --shadow-card:  0 8px 26px rgba(15, 23, 42, 0.045);
  --shadow-hover: 0 16px 42px rgba(15, 23, 42, 0.08);
  --shadow-blue:  0 14px 30px rgba(37, 99, 235, 0.18);

  --font-head: "Manrope", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
}

/* ---- Reset ---- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); font-size: 16px; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

.container {
  width: min(var(--container), calc(100% - 48px));
  margin-inline: auto;
}
.pc-only { display: inline; }

/* ---- Material Symbols 对齐 ---- */
.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  vertical-align: middle;
  line-height: 1;
}

/* ---- 按钮 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  cursor: pointer;
  border: none;
}
.btn .material-symbols-outlined { font-size: 18px; }

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: var(--shadow-blue);
}
.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 20px 40px rgba(37, 99, 235, 0.26);
}

.btn-ghost {
  background: var(--bg-soft);
  color: var(--text);
  border: 1px solid var(--border-card);
}
.btn-ghost:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
}

.btn-primary-invert {
  background: #fff;
  color: var(--primary);
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 24px;
  border-radius: var(--radius);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn-primary-invert:hover { transform: translateY(-1px); box-shadow: 0 10px 28px rgba(0,0,0,0.15); }

.btn-outline-invert {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255,255,255,0.6);
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 24px;
  border-radius: var(--radius);
  transition: border-color 0.15s ease, background 0.15s ease;
}
.btn-outline-invert:hover { border-color: #fff; background: rgba(255,255,255,0.1); }

/* ---- 顶部导航 ---- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  z-index: 100;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-nav);
  transition: box-shadow 0.3s ease;
}
.site-header.scrolled { box-shadow: 0 10px 40px rgba(25,27,35,0.08); }

.nav {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 800;
  color: var(--primary-dark);
  flex-shrink: 0;
}
.logo-mark {
  width: 32px; height: 32px;
  display: grid; place-items: center;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 16px;
  font-weight: 800;
}
.logo-text em {
  font-style: normal;
  color: var(--primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-menu a {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-sec);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: color 0.15s ease, background 0.15s ease;
}
.nav-menu a:hover { color: var(--text); background: var(--bg-soft); }
.nav-menu .nav-cta {
  margin-left: 8px;
  padding: 8px 18px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius);
}
.nav-menu .nav-cta:hover { background: var(--primary-dark); }

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
}
.nav-toggle span {
  display: block;
  width: 22px; height: 2px;
  margin: 4px 0;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---- Hero ---- */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: calc(100vh - var(--header-h));
  padding: calc(var(--header-h) + 40px) 0 60px;
  text-align: center;
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(ellipse at 50% 42%, rgba(37, 99, 235, 0.10) 0%, rgba(37, 99, 235, 0.035) 32%, transparent 64%),
    linear-gradient(135deg, #F8FBFF 0%, #FFFFFF 48%, #FBFAFF 100%);
}
.hero::before {
  content: "";
  position: absolute;
  inset: -18%;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 18% 24%, rgba(59, 130, 246, 0.16), transparent 21%),
    radial-gradient(circle at 82% 70%, rgba(124, 58, 237, 0.12), transparent 24%);
  filter: blur(24px);
  opacity: 0.82;
  animation: signal-drift 18s ease-in-out infinite alternate;
}
.hero::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(760px, 82vw);
  aspect-ratio: 1;
  z-index: 0;
  border: 1px solid rgba(37, 99, 235, 0.10);
  border-radius: 50%;
  box-shadow:
    0 0 0 38px rgba(37, 99, 235, 0.022),
    0 0 0 76px rgba(124, 58, 237, 0.018);
  pointer-events: none;
  opacity: 0.9;
  transform: translate(-50%, -50%);
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}
.hero-grid {
  position: absolute;
  inset: 0;
  display: block;
  opacity: 0.58;
  background-image:
    linear-gradient(rgba(37, 99, 235, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.055) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(ellipse at center, #000 0%, rgba(0, 0, 0, 0.72) 40%, transparent 78%);
  mask-image: radial-gradient(ellipse at center, #000 0%, rgba(0, 0, 0, 0.72) 40%, transparent 78%);
}
.hero-grid::before {
  content: "";
  position: absolute;
  top: 31%;
  left: calc(50% + min(250px, 27vw));
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #60A5FA;
  box-shadow:
    0 0 0 7px rgba(96, 165, 250, 0.13),
    0 0 28px 7px rgba(37, 99, 235, 0.27);
  animation: signal-pulse 4.8s ease-in-out infinite;
}
.hero-grid::after {
  content: "";
  position: absolute;
  inset: 20% 17%;
  border: 1px solid rgba(124, 58, 237, 0.12);
  border-left-color: rgba(37, 99, 235, 0.34);
  border-radius: 49% 51% 47% 53%;
  transform: rotate(-18deg);
  animation: signal-orbit 22s linear infinite;
}
.hero-inner {
  position: relative;
  z-index: 1;
  width: min(100% - 40px, 900px);
  margin-inline: auto;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  border-radius: 9999px;
  border: 1px solid var(--primary-border);
  background: var(--primary-bg);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 24px;
}
.hero-eyebrow .material-symbols-outlined { font-size: 14px; }

.hero-title {
  font-family: var(--font-head);
  font-size: clamp(40px, 7vw, 78px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.055em;
  color: var(--text);
  margin-bottom: 20px;
  text-wrap: balance;
  text-shadow: 0 12px 32px rgba(30, 64, 175, 0.08);
}
.hero-title::after {
  content: "";
  display: block;
  width: clamp(92px, 15vw, 156px);
  height: 5px;
  margin: 27px auto 0;
  border-radius: 999px;
  background: linear-gradient(90deg, #2563EB 0%, #7C3AED 100%);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.2);
}
.text-primary {
  color: var(--primary);
  background: linear-gradient(115deg, #2563EB 10%, #7C3AED 88%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

@keyframes signal-drift {
  from { transform: translate3d(-2%, -1%, 0) scale(1); }
  to { transform: translate3d(2%, 1%, 0) scale(1.04); }
}

@keyframes signal-pulse {
  0%, 100% { opacity: 0.68; transform: scale(0.86); }
  50% { opacity: 1; transform: scale(1.12); }
}

@keyframes signal-orbit {
  from { transform: rotate(-18deg); }
  to { transform: rotate(342deg); }
}

.hero-sub {
  max-width: 900px;
  margin: 0 auto 36px;
  color: var(--text-sub);
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.62;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  max-width: 840px;
  margin-inline: auto;
}
.hero-stats li {
  padding: 20px 16px;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-card);
}
.stat-num {
  display: block;
  font-family: var(--font-head);
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 800;
  color: var(--primary);
  line-height: 1.1;
}
.stat-num::after { content: "+"; font-size: 0.55em; vertical-align: super; }
.hero-stats span {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--text-muted);
}

/* ---- 通用 Section ---- */
.section {
  padding: 92px 0;
  background: #FFFFFF;
}
.section + .section { border-top: 1px solid var(--border); }
.section-head { text-align: center; margin-bottom: 48px; }

.section-eyebrow {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 12px;
  opacity: 0.75;
}

.section-title {
  font-family: var(--font-head);
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: 0;
  color: var(--text);
}

.section-desc {
  margin-top: 14px;
  color: var(--text-sub);
  font-size: 15px;
  max-width: 580px;
  line-height: 1.62;
}
.section-head .section-desc { margin-inline: auto; }

/* ---- 新书推荐 ---- */
.book-feature {
  padding-top: 40px;
  padding-bottom: 58px;
  background: #FFFFFF;
}
.book-feature + .platform-tools {
  border-top: 0;
}
.book-feature-card {
  display: grid;
  grid-template-columns: minmax(280px, 0.42fr) minmax(0, 0.58fr);
  gap: 42px;
  align-items: center;
  padding: 36px;
  border: 1px solid #DCE6F3;
  border-radius: 24px;
  background: #FFFFFF;
  box-shadow: 0 18px 52px rgba(15, 23, 42, 0.06);
}
.book-feature-cover {
  min-height: 430px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 0;
  background: transparent;
  overflow: visible;
}
.book-feature-cover img {
  width: min(100%, 360px);
  max-height: 470px;
  object-fit: contain;
  filter: drop-shadow(0 22px 28px rgba(15, 23, 42, 0.14));
}
.book-feature-content {
  min-width: 0;
}
.book-feature-title {
  margin: 0;
  color: var(--text);
  font-family: var(--font-head);
  font-size: clamp(28px, 3.2vw, 42px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: 0;
}
.book-feature-lead {
  max-width: 680px;
  margin-top: 18px;
  color: var(--text-sub);
  font-size: 17px;
  line-height: 1.72;
}
.book-feature-points {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 28px;
}
.book-feature-points div {
  min-height: 132px;
  padding: 17px 16px;
  border: 1px solid var(--border-card);
  border-radius: 16px;
  background: #FFFFFF;
}
.book-feature-points strong {
  display: block;
  margin-bottom: 8px;
  color: var(--text);
  font-size: 15px;
  font-weight: 800;
  line-height: 1.35;
}
.book-feature-points span {
  display: block;
  color: var(--text-sec);
  font-size: 13px;
  line-height: 1.58;
}
.book-feature-quote {
  margin: 26px 0 0;
  padding: 14px 18px;
  border-left: 3px solid var(--primary);
  border-radius: 0 14px 14px 0;
  background: #F8FBFF;
  color: var(--text-sec);
  font-size: 15px;
  line-height: 1.7;
}
.book-feature-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---- 平台能力入口 ---- */
.platform-tools {
  padding-top: 56px;
  background: #FFFFFF;
}
.platform-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.platform-card {
  min-height: 210px;
  display: flex;
  flex-direction: column;
  position: relative;
  padding: 24px 22px 22px;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  background: #FFFFFF;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.platform-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary-border);
  box-shadow: var(--shadow-hover);
}
.platform-icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: var(--radius);
  border: 1px solid var(--primary-border);
  background: #FFFFFF;
  color: var(--primary);
  font-size: 23px;
  margin-bottom: 22px;
}
.platform-card-body {
  display: grid;
  gap: 8px;
  min-width: 0;
}
.platform-card-body strong {
  color: var(--text);
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: 0;
}
.platform-card-body span {
  color: var(--text-sub);
  font-size: 14px;
  line-height: 1.62;
}
.platform-card-action {
  position: absolute;
  top: 24px;
  right: 22px;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 18px;
  transition: color 0.2s ease, transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}
.platform-card:hover .platform-card-action {
  color: var(--primary);
  background: var(--primary-bg);
  border-color: var(--primary-border);
  transform: translateX(2px);
}

/* ---- 资源入口 ---- */
.resources { background: #FFFFFF; }

.resource-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.resource-card {
  padding: 26px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-card);
  background: var(--surface);
  box-shadow: var(--shadow-card);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  display: flex;
  flex-direction: column;
}
.resource-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-border);
}

.resource-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 16px;
}
.resource-icon {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  border-radius: var(--radius-sm);
  background: var(--primary-bg);
  color: var(--primary);
  flex-shrink: 0;
}
.resource-icon .material-symbols-outlined { font-size: 22px; }
.resource-badge {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 3px 9px;
  border-radius: 9999px;
  background: var(--primary-bg);
  color: var(--primary);
  border: 1px solid var(--primary-border);
}

.resource-title {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}
.resource-desc {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 20px;
}
.resource-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: auto;
}
.resource-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--primary-border);
  background: var(--primary-bg);
  transition: background 0.15s ease, border-color 0.15s ease;
}
.resource-link:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.resource-link .material-symbols-outlined { font-size: 14px; }
.resource-link-secondary {
  background: transparent;
  color: var(--text-sub);
  border-color: var(--border-card);
}
.resource-link-secondary:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* featured card: 高优先级覆盖 display:flex */
.resource-card.resource-card-featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 52px 1fr auto;
  grid-template-rows: auto 1fr;
  column-gap: 28px;
  row-gap: 8px;
  align-items: start;
  padding: 28px 32px;
}
.resource-card.resource-card-featured .resource-header {
  grid-column: 1; grid-row: 1 / 3;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  gap: 8px;
  margin-bottom: 0;
}
.resource-card.resource-card-featured .resource-title {
  grid-column: 2; grid-row: 1;
  font-size: 20px;
  align-self: end;
  margin-bottom: 0;
}
.resource-card.resource-card-featured .resource-desc {
  grid-column: 2; grid-row: 2;
  margin-bottom: 0;
  font-size: 15px;
  align-self: start;
}
.resource-card.resource-card-featured .resource-links {
  grid-column: 3; grid-row: 1 / 3;
  margin-top: 0;
  align-self: center;
  flex-direction: column;
}

/* ---- 皮书 ---- */
.books { background: #FFFFFF; }
.book-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.book-card {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-card);
  background: var(--surface);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.book-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }

.book-body { padding: 24px; display: flex; flex-direction: column; flex: 1; }
.book-tag {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 10px;
}
.book-body h3 {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}
.book-body p {
  font-size: 13.5px;
  color: var(--text-sub);
  line-height: 1.7;
  flex: 1;
}
.book-cta {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 18px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
}
.book-cta .material-symbols-outlined { font-size: 16px; transition: transform 0.15s ease; }
.book-card:hover .book-cta .material-symbols-outlined { transform: translateX(3px); }
.book-cta-muted { color: var(--text-muted); }
.book-cta-muted .material-symbols-outlined { font-size: 16px; }

/* ---- GEO 大会 ---- */
.conference { background: #FFFFFF; }
.conf-card {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 56px;
  align-items: center;
  padding: 52px 56px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--primary-border);
  background: #FFFFFF;
  box-shadow: var(--shadow-card);
}

.conf-points {
  margin: 24px 0 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.conf-points li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--text-sub);
  font-size: 15px;
}
.conf-points li .material-symbols-outlined {
  font-size: 18px;
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 2px;
  font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

.conf-visual { display: grid; place-items: center; }
.conf-badge {
  width: min(260px, 100%);
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1.5px dashed rgba(37,99,235,0.35);
  display: grid;
  place-content: center;
  text-align: center;
  gap: 8px;
  background: #FFFFFF;
}
.conf-num {
  font-family: var(--font-head);
  font-size: 64px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}
.conf-label {
  font-size: 13px;
  color: var(--text-sub);
  letter-spacing: 0.06em;
}

/* ---- 文章 ---- */
.articles { background: #FFFFFF; }
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.article-card {
  padding: 28px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-card);
  background: var(--surface);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.article-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.article-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.article-source {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}
.article-tag {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 2px 8px;
  border-radius: 9999px;
  background: var(--primary-bg);
  color: var(--primary);
}
.article-card h3 {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.4;
  margin-bottom: 10px;
}
.article-card p {
  font-size: 13.5px;
  color: var(--text-sub);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 20px;
}
.article-cta {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  margin-top: auto;
}
.article-cta .material-symbols-outlined { font-size: 15px; transition: transform 0.15s ease; }
.article-card:hover .article-cta .material-symbols-outlined { transform: translateX(3px); }

/* ---- 创始人 ---- */
.founders { background: #FFFFFF; }
.founder-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  max-width: 860px;
  margin-inline: auto;
}
.founder-card {
  padding: 36px 32px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-card);
  background: var(--surface);
  box-shadow: var(--shadow-card);
  text-align: center;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.founder-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.founder-avatar {
  width: 72px; height: 72px;
  margin: 0 auto 18px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-family: var(--font-head);
  font-size: 28px;
  font-weight: 800;
  color: #fff;
  background: var(--primary);
}
.founder-avatar-2 { background: var(--primary-dark); }
.founder-card h3 {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
}
.founder-role {
  margin: 6px 0 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary);
}
.founder-bio {
  font-size: 14px;
  color: var(--text-sub);
  text-align: left;
  line-height: 1.75;
  margin-bottom: 18px;
}
.founder-links { display: flex; justify-content: center; gap: 8px; }
.founder-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  padding: 6px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--primary-border);
  background: var(--primary-bg);
  transition: background 0.15s, border-color 0.15s;
}
.founder-link:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.founder-link .material-symbols-outlined { font-size: 14px; }

/* ---- CTA ---- */
.cta-band { padding: 0 0 88px; }
.cta-inner {
  text-align: center;
  padding: 64px 40px;
  border-radius: var(--radius-xl);
  background: var(--surface);
  border: 1px solid var(--border-card);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}
.cta-icon {
  display: block;
  font-size: 40px;
  margin: 0 auto 16px;
  color: var(--primary);
  font-variation-settings: 'FILL' 0, 'wght' 300, 'GRAD' 0, 'opsz' 48;
}
.cta-inner h2 {
  font-family: var(--font-head);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  color: var(--text);
  margin-bottom: 12px;
}
.cta-inner p {
  font-size: 15px;
  color: var(--text-sub);
  max-width: 480px;
  margin-inline: auto;
  margin-bottom: 32px;
}
.cta-actions { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--border);
  background: #FFFFFF;
  padding: 56px 0 0;
}
.footer-inner {
  display: flex;
  justify-content: center;
  padding-bottom: 40px;
}
.footer-brand { text-align: center; }
.footer-brand .logo { margin-bottom: 12px; }
.footer-brand p {
  font-size: 14px;
  color: var(--text-sub);
  margin-bottom: 4px;
}
.footer-tagline {
  font-size: 13px;
  color: var(--text-muted);
}
.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.footer-links h4 {
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 14px;
}
.footer-links a {
  display: block;
  margin-bottom: 10px;
  font-size: 14px;
  color: var(--text-sub);
  transition: color 0.15s ease;
}
.footer-links a:hover { color: var(--primary); }
.footer-bottom {
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 88px;
  padding: 18px 0 20px;
  font-size: 13px;
  color: var(--text-muted);
}
.footer-bottom__signature {
  width: 40px;
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(90deg, #60A5FA 0%, var(--primary) 52%, #4F46E5 100%);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.18);
}
.footer-bottom p {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin: 0;
  line-height: 1.5;
}
.footer-bottom__year {
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.025em;
}
.footer-bottom__divider {
  width: 4px;
  height: 4px;
  border-radius: 999px;
  background: #3B82F6;
}
.footer-bottom__company {
  color: var(--text-sub);
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: 0.035em;
}

/* ---- 滚动显现 ---- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after {
    animation: none !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== 响应式 ===== */
@media (max-width: 1100px) {
  .book-feature-card {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .book-feature-cover {
    min-height: 360px;
  }
  .book-feature-cover img {
    width: min(100%, 320px);
  }
  .platform-grid { grid-template-columns: repeat(2, 1fr); }
  .resource-grid { grid-template-columns: repeat(2, 1fr); }
  .resource-card-featured { grid-template-columns: 56px 1fr auto; column-gap: 24px; }
  .book-grid { grid-template-columns: repeat(2, 1fr); }
  .conf-card { grid-template-columns: 1fr; padding: 40px 36px; gap: 36px; }
  .conf-visual { order: -1; }
  .conf-badge { width: 200px; }
  .conf-num { font-size: 52px; }
}

@media (max-width: 768px) {
  .pc-only { display: none; }
  .section { padding: 64px 0; }
  .container { width: calc(100% - 40px); }
  .hero {
    min-height: calc(100svh - var(--header-h));
    padding: calc(var(--header-h) + 52px) 0 60px;
  }
  .hero-inner { width: min(100% - 32px, 640px); }
  .hero-title {
    font-size: clamp(38px, 11vw, 60px);
    letter-spacing: -0.04em;
  }
  .hero-title::after {
    height: 4px;
    margin-top: 22px;
  }
  .hero::after {
    width: 118vw;
    opacity: 0.72;
  }
  .hero-grid {
    opacity: 0.42;
    background-size: 36px 36px;
  }
  .hero-grid::before {
    top: 24%;
    left: auto;
    right: 16%;
  }
  .hero-grid::after { inset: 27% 5%; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); margin-top: 48px; }
  .hero-actions { flex-direction: column; align-items: center; }
  .hero-actions .btn { width: 100%; max-width: 300px; justify-content: center; }
  .book-feature {
    padding-top: 24px;
    padding-bottom: 48px;
  }
  .book-feature-card {
    padding: 24px;
    border-radius: var(--radius-lg);
  }
  .book-feature-cover {
    min-height: 320px;
    border-radius: 16px;
  }
  .book-feature-cover img {
    width: min(100%, 275px);
    max-height: 360px;
  }
  .book-feature-title {
    font-size: 28px;
  }
  .book-feature-lead {
    font-size: 15px;
  }
  .book-feature-points {
    grid-template-columns: 1fr;
  }
  .book-feature-points div {
    min-height: auto;
  }
  .book-feature-actions {
    flex-direction: column;
  }
  .book-feature-actions .btn {
    width: 100%;
    justify-content: center;
  }
  .article-grid { grid-template-columns: 1fr; }
  .founder-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .footer-links { grid-template-columns: 1fr 1fr; gap: 24px; }
  .cta-inner { padding: 44px 24px; }
  .cta-actions { flex-direction: column; align-items: center; }
  .cta-actions .btn { width: 100%; max-width: 300px; justify-content: center; }

  /* 移动端导航 */
  .nav-toggle { display: block; }
  .nav-menu {
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 8px 20px 20px;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.25s ease, opacity 0.25s ease, visibility 0.25s;
    box-shadow: 0 20px 40px rgba(0,0,0,0.08);
  }
  .nav-menu.open { transform: none; opacity: 1; visibility: visible; }
  .nav-menu li { border-bottom: 1px solid var(--border); }
  .nav-menu li:last-child { border-bottom: 0; margin-top: 12px; }
  .nav-menu a { display: block; padding: 14px 8px; font-size: 15px; border-radius: 0; }
  .nav-menu .nav-cta { text-align: center; border-radius: var(--radius); margin: 0; }
}

@media (max-width: 600px) {
  .book-grid { grid-template-columns: 1fr; }
  .platform-grid { grid-template-columns: 1fr; }
  .platform-card {
    min-height: auto;
    padding: 22px 20px 20px;
  }
  .platform-icon {
    width: 44px;
    height: 44px;
    font-size: 22px;
    margin-bottom: 18px;
  }
  .platform-card-action {
    top: 22px;
    right: 20px;
  }
  .resource-grid { grid-template-columns: 1fr; }
  .resource-card-featured {
    display: flex;
    flex-direction: column;
  }
  .footer-links { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 10px; }
}



/* ---- GEOrank 自定义首页导航对齐公共头部 2026-06-16 ---- */
.georank-platform-header {
  height: 64px;
  background: rgba(255,255,255,0.86);
  border-bottom-color: #F1F5F9;
  box-shadow: 0 10px 40px rgba(25,27,35,0.04);
}
.georank-platform-nav {
  width: 100%;
  max-width: 1280px;
  height: 64px;
  padding-inline: 24px;
  margin-inline: auto;
  justify-content: flex-start;
  gap: 32px;
}
.georank-platform-logo {
  width: auto;
  min-width: 0;
  flex: 0 0 auto;
}
.brand-logo-image {
  display: block;
  width: auto;
  height: 34px;
  object-fit: contain;
}
.georank-platform-menu {
  flex: 0 0 auto;
  justify-content: flex-start;
  align-items: center;
  gap: 20px;
  min-width: 0;
}
.georank-platform-menu a {
  display: block;
  position: relative;
  padding: 0;
  border-radius: 0;
  color: #475569;
  font-family: Manrope, Inter, sans-serif;
  font-size: 15.2px;
  font-weight: 750;
  line-height: 15.2px;
  letter-spacing: 0;
  white-space: nowrap;
}
.georank-platform-menu a:hover {
  background: transparent;
  color: #2563EB;
}
.georank-platform-menu a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -23px;
  height: 3px;
  border-radius: 999px;
  background: #2563EB;
  opacity: 0;
  transform: scaleX(0.7);
  transition: opacity 0.16s ease, transform 0.16s ease;
}
.georank-platform-menu a:hover::after {
  opacity: 1;
  transform: scaleX(1);
}
.georank-header-actions {
  flex: 0 0 auto;
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.georank-profile-link {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #DBE3EF;
  border-radius: 16px;
  color: #334155;
  background: #FFFFFF;
  box-shadow: 0 12px 28px rgba(15,23,42,0.055);
  transition: border-color 0.16s ease, color 0.16s ease, transform 0.16s ease, box-shadow 0.16s ease;
}
.georank-profile-link:hover {
  border-color: #BFD7FF;
  color: #2563EB;
  transform: translateY(-1px);
  box-shadow: 0 14px 34px rgba(37,99,235,0.10);
}
.georank-platform-logo:focus-visible,
.georank-platform-menu a:focus-visible,
.georank-profile-link:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.28);
  outline-offset: 4px;
}
.georank-profile-link__icon {
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: #EFF6FF;
  color: #2563EB;
}
.georank-profile-link .material-symbols-outlined {
  font-size: 20px;
}
.reveal {
  opacity: 1;
  transform: none;
}
@media (max-width: 980px) {
  .georank-platform-nav {
    width: 100%;
    max-width: none;
    padding-inline: 20px;
    gap: 24px;
  }
  .georank-platform-menu {
    flex: 1 1 auto;
    gap: 18px;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .georank-platform-menu::-webkit-scrollbar {
    display: none;
  }
}
@media (max-width: 768px) {
  .georank-platform-nav {
    overflow: hidden;
    gap: 18px;
    padding-inline: 16px;
  }
  .site-header .georank-platform-menu {
    position: static;
    flex-direction: row;
    align-items: center;
    background: transparent;
    backdrop-filter: none;
    border-bottom: 0;
    box-shadow: none;
    padding: 0;
    transform: none;
    opacity: 1;
    visibility: visible;
  }
  .georank-platform-menu li,
  .georank-platform-menu li:last-child {
    flex: 0 0 auto;
    border-bottom: 0;
    margin-top: 0;
  }
  .site-header .georank-platform-menu a {
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    padding: 0;
    font-size: 14px;
    line-height: 14px;
  }
  .georank-header-actions {
    gap: 8px;
  }
  .georank-profile-link {
    width: 40px;
    height: 40px;
    border-radius: 14px;
  }
  .georank-profile-link__icon {
    width: 29px;
    height: 29px;
    border-radius: 10px;
  }
}
@media (max-width: 520px) {
  .georank-platform-nav {
    padding-inline: 12px;
    gap: 14px;
  }
  .georank-platform-logo {
    width: auto;
    min-width: 0;
  }
  .brand-logo-image {
    height: 30px;
  }
  .georank-platform-menu {
    gap: 14px;
  }
  .georank-header-actions {
    gap: 6px;
  }
  .georank-profile-link {
    width: 38px;
    height: 38px;
  }
}