:root {
  --bg-dark: #05060a;
  --bg-elevated: #0b1020;
  --bg-alt: #070b16;
  --accent: #34d1ff;
  --accent-strong: #ff2f6a;
  --accent-soft: rgba(52, 209, 255, 0.18);
  --accent-soft-2: rgba(255, 47, 106, 0.2);
  --border-subtle: #1f2937;
  --text-main: #f9fafb;
  --text-muted: #9ca3af;
  --text-soft: #6b7280;
  --shadow-soft: 0 22px 55px rgba(0, 0, 0, 0.9);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-pill: 999px;
  --transition-fast: 0.18s ease-out;
  --transition-med: 0.28s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-family: 'Montserrat', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI',
    sans-serif;
  background: radial-gradient(circle at top left, #111827 0, #020617 55%, #000000 100%);
  color: var(--text-main);
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: -40%;
  background: radial-gradient(circle at 0% 0%, rgba(56, 189, 248, 0.26), transparent 55%),
    radial-gradient(circle at 100% 10%, rgba(236, 72, 153, 0.3), transparent 55%),
    radial-gradient(circle at 50% 100%, rgba(129, 140, 248, 0.22), transparent 55%);
  opacity: 0.55;
  pointer-events: none;
  mix-blend-mode: screen;
  animation: orbitGlow 28s infinite linear;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(1120px, 100% - 40px);
  margin: 0 auto;
}

.section {
  padding: 96px 0;
}

.section-alt {
  background: radial-gradient(circle at top right, rgba(30, 64, 175, 0.22), #020617 55%, #000 100%);
}

/* Overview (Home) - extra tech glow */

#overview.section-alt {
  position: relative;
  overflow: hidden;
}

#overview.section-alt::before {
  content: '';
  position: absolute;
  inset: -35%;
  background: radial-gradient(circle at 15% 10%, rgba(56, 189, 248, 0.22), transparent 55%),
    radial-gradient(circle at 85% 30%, rgba(236, 72, 153, 0.16), transparent 55%),
    radial-gradient(circle at 40% 100%, rgba(129, 140, 248, 0.14), transparent 60%);
  opacity: 0.9;
  pointer-events: none;
  mix-blend-mode: screen;
  filter: blur(6px);
  animation: orbitGlow 34s linear infinite;
}

#overview.section-alt::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
      90deg,
      rgba(148, 163, 255, 0.055),
      rgba(148, 163, 255, 0.055) 1px,
      transparent 1px,
      transparent 22px
    ),
    repeating-linear-gradient(
      0deg,
      rgba(52, 209, 255, 0.04),
      rgba(52, 209, 255, 0.04) 1px,
      transparent 1px,
      transparent 22px
    );
  opacity: 0.35;
  pointer-events: none;
  mask-image: radial-gradient(circle at 50% 35%, rgba(0, 0, 0, 1), rgba(0, 0, 0, 0));
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
  max-width: 720px;
  position: relative;
  z-index: 1;
}

.section-header h2 {
  font-size: 28px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0 0 16px;
}

.section-header p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.7;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(18px);
  background: linear-gradient(
    to bottom,
    rgba(3, 7, 18, 0.96),
    rgba(3, 7, 18, 0.9),
    transparent
  );
  border-bottom: 1px solid rgba(15, 23, 42, 0.95);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 28px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.logo-mark {
  width: 54px;
  height: 54px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: radial-gradient(circle at 20% 0, rgba(248, 250, 252, 0.2), rgba(15, 23, 42, 1));
  box-shadow: 0 0 0 1px rgba(79, 70, 229, 0.85), 0 0 24px rgba(59, 130, 246, 0.75);
}

.logo-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.logo-text-cn {
  font-weight: 600;
  font-size: 16px;
}

.logo-text-en {
  font-size: 12px;
  color: var(--text-soft);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 13px;
}

.main-nav a {
  position: relative;
  padding: 4px 0;
  color: var(--text-soft);
  transition: color var(--transition-fast);
}

.main-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-strong));
  transition: width var(--transition-fast);
}

.main-nav a:hover {
  color: var(--text-main);
}

.main-nav a:hover::after {
  width: 100%;
}

.main-nav a.is-active {
  color: var(--text-main);
}

.main-nav a.is-active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.lang-select-wrap {
  position: relative;
  margin-right: 4px;
}

.lang-select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  padding: 5px 22px 5px 10px;
  border-radius: 999px;
  border: 1px solid rgba(75, 85, 120, 0.9);
  background: radial-gradient(circle at top left, rgba(52, 209, 255, 0.14), #05060a);
  color: var(--text-soft);
  font-size: 11px;
}

.lang-select-wrap::after {
  content: '▾';
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 9px;
  color: var(--text-soft);
  pointer-events: none;
}

.btn {
  border-radius: var(--radius-pill);
  padding: 7px 16px;
  font-size: 13px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-main);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: background var(--transition-fast), border-color var(--transition-fast),
    transform var(--transition-fast), box-shadow var(--transition-fast), color var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  border-color: transparent;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.6);
  background-size: 200% 200%;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 0 1px rgba(52, 209, 255, 0.5), 0 0 24px rgba(52, 209, 255, 0.85);
  background-position: 100% 0;
}

.btn-outline {
  border-color: var(--border-subtle);
  background: radial-gradient(circle at top left, rgba(248, 250, 252, 0.18), rgba(15, 23, 42, 0.96));
}

.btn-outline:hover {
  border-color: var(--accent);
  background: radial-gradient(circle at top left, rgba(52, 209, 255, 0.35), rgba(15, 23, 42, 1));
  box-shadow: 0 0 18px rgba(52, 209, 255, 0.45);
}

.btn-ghost {
  border-color: rgba(78, 86, 120, 0.5);
  color: var(--text-soft);
}

.btn-ghost:hover {
  border-color: rgba(150, 156, 188, 0.8);
  color: var(--text-main);
  background: rgba(30, 36, 66, 0.7);
}

.btn-lg {
  padding: 10px 24px;
  font-size: 14px;
}

a.btn {
  text-decoration: none;
}

.btn-block {
  width: 100%;
  margin-top: 8px;
}

/* Auth & Form */
.auth-section {
  padding-top: 100px;
  min-height: 60vh;
}

.auth-container {
  max-width: 420px;
  margin: 0 auto;
}

.auth-card {
  background: radial-gradient(circle at top left, rgba(52, 209, 255, 0.18), #020617);
  border: 1px solid rgba(52, 63, 110, 0.95);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
}

.auth-title {
  margin: 0 0 6px;
  font-size: 22px;
}

.auth-subtitle {
  margin: 0 0 20px;
  font-size: 13px;
  color: var(--text-muted);
}

.flash-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
}

.flash-msg {
  padding: 10px 12px;
  border-radius: var(--radius-md);
  background: rgba(255, 47, 106, 0.2);
  border: 1px solid rgba(255, 47, 106, 0.6);
  color: #ff8fad;
  font-size: 13px;
}

.flash-global {
  padding-top: 80px;
  padding-bottom: 12px;
}

.flash-global .flash-msg {
  margin-bottom: 8px;
}

.flash-global .flash-msg:last-child {
  margin-bottom: 0;
}

.auth-form .form-group {
  margin-bottom: 14px;
}

.auth-form label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  color: var(--text-muted);
}

.form-input {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(62, 72, 120, 0.9);
  background: rgba(10, 12, 22, 0.95);
  color: var(--text-main);
  font-size: 14px;
  font-family: inherit;
}

.form-input::placeholder {
  color: var(--text-soft);
}

.form-input:focus {
  outline: none;
  border-color: var(--accent);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.auth-footer {
  margin: 18px 0 0;
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
}

.auth-link {
  color: var(--accent);
}

.auth-link:hover {
  text-decoration: underline;
}

/* Profile */
.profile-section {
  padding-top: 100px;
}

.profile-container {
  max-width: 560px;
  margin: 0 auto;
}

.profile-card {
  background: radial-gradient(circle at top left, rgba(30, 64, 175, 0.35), #020617);
  border: 1px solid rgba(31, 41, 55, 0.95);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
}

.profile-row {
  margin-bottom: 16px;
}

.profile-row-avatar {
  display: flex;
  align-items: center;
  gap: 16px;
}

.profile-label {
  display: block;
  font-size: 12px;
  color: var(--text-soft);
  margin-bottom: 4px;
}

.profile-value {
  font-size: 15px;
}

.profile-bio {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
  white-space: pre-wrap;
}

.profile-actions {
  margin-top: 20px;
}

.profile-avatar {
  width: 72px;
  height: 72px;
  border-radius: 999px;
  overflow: hidden;
  border: 2px solid rgba(52, 209, 255, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at top, #1f2937, #020617);
}

.profile-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.profile-avatar-initial {
  font-size: 28px;
  font-weight: 600;
  color: var(--text-main);
}

.text-muted {
  color: var(--text-muted);
}

.nav-toggle {
  display: none;
  width: 32px;
  height: 32px;
  padding: 0;
  border-radius: 8px;
  border: 1px solid rgba(60, 64, 90, 0.8);
  background: rgba(9, 11, 20, 0.9);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
}

.nav-toggle span {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: #e0e4ff;
}

/* Hero */

.hero {
  padding-top: 80px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1.1fr);
  align-items: center;
  gap: 40px;
}

.hero::before {
  content: '';
  position: absolute;
  inset: -40%;
  background: radial-gradient(circle at 10% 0%, rgba(56, 189, 248, 0.18), transparent 55%),
    radial-gradient(circle at 90% 100%, rgba(236, 72, 153, 0.16), transparent 55%);
  opacity: 0.65;
  pointer-events: none;
  mix-blend-mode: screen;
  animation: orbitGlow 30s linear infinite;
}

.hero > .container {
  position: relative;
  z-index: 1;
}

.hero-copy h1 {
  font-size: 34px;
  line-height: 1.2;
  margin: 10px 0 18px;
}

.hero-copy h1 span {
  display: block;
}

.eyebrow {
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.gradient-text {
  background: linear-gradient(120deg, #ffffff, #e4f3ff, #34d1ff);
  -webkit-background-clip: text;
  color: transparent;
}

.hero-subtitle {
  margin: 0 0 26px;
  color: var(--text-muted);
  line-height: 1.8;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 24px;
}

.hero-actions .btn-outline {
  background: transparent;
}

.hero-metas {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.meta-item {
  padding: 12px 14px;
  border-radius: 14px;
  background: radial-gradient(circle at top left, rgba(37, 99, 235, 0.55), rgba(15, 23, 42, 0.98));
  border: 1px solid rgba(59, 130, 246, 0.9);
  box-shadow: 0 14px 32px rgba(15, 23, 42, 0.9);
}

.meta-label {
  font-size: 11px;
  color: #cbd5ff;
}

.meta-value {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  font-weight: 600;
}

.meta-sub {
  display: block;
  margin-top: 2px;
  font-size: 11px;
  color: var(--accent);
}

.hero-visual {
  position: relative;
  align-self: stretch;
}

.hero-card {
  border-radius: var(--radius-lg);
  padding: 18px 18px 16px;
  border: 1px solid rgba(55, 65, 81, 0.95);
  box-shadow: var(--shadow-soft);
  background: radial-gradient(circle at top left, rgba(52, 209, 255, 0.18), #020617);
  position: relative;
  overflow: hidden;
}

.hero-card.primary {
  transform: translateY(6px);
}

.hero-card.secondary {
  margin-top: 16px;
  padding-top: 16px;
  background: radial-gradient(circle at bottom right, rgba(255, 47, 106, 0.18), #05060a);
  border-color: rgba(85, 52, 120, 0.9);
}

.hero-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  margin-bottom: 12px;
}

.status-pill {
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  font-size: 11px;
  border: 1px solid rgba(84, 215, 165, 0.9);
  color: #4ade80;
  background: rgba(6, 95, 70, 0.3);
  box-shadow: 0 0 0 1px rgba(34, 197, 94, 0.5);
  animation: pulseRing 3.8s infinite;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.metric {
  padding: 10px 10px 9px;
  border-radius: 12px;
  background: rgba(12, 16, 30, 0.9);
  border: 1px solid rgba(48, 61, 110, 0.9);
}

.metric-label {
  font-size: 11px;
  color: var(--text-soft);
}

.metric-value {
  display: block;
  margin-top: 4px;
  font-weight: 600;
}

.metric-sub {
  display: block;
  margin-top: 2px;
  font-size: 11px;
  color: var(--accent);
}

.hero-card-title {
  font-size: 14px;
  margin: 0 0 6px;
}

.hero-card-desc {
  margin: 0 0 12px;
  font-size: 13px;
  color: var(--text-muted);
}

.hero-tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: 11px;
  background: rgba(15, 20, 40, 0.9);
  border: 1px solid rgba(82, 96, 160, 0.9);
}

.hero-hq-card {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 18px;
  align-items: stretch;
  min-height: 360px;
  padding: 22px 22px 20px;
  position: relative;
}

.hero-hq-media {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(148, 163, 255, 0.9);
  min-height: 360px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.8);
}

.hero-hq-card::before {
  content: '';
  position: absolute;
  inset: -10px;
  border-radius: calc(var(--radius-lg) + 12px);
  background: radial-gradient(circle at 20% 0%, rgba(52, 209, 255, 0.22), transparent 55%),
    radial-gradient(circle at 90% 30%, rgba(255, 47, 106, 0.16), transparent 58%),
    linear-gradient(135deg, rgba(148, 163, 255, 0.18), rgba(52, 209, 255, 0.08));
  filter: blur(14px);
  opacity: 0.9;
  pointer-events: none;
  mix-blend-mode: screen;
}

.hero-hq-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-hq-info {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hero-hq-meta-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

/* Overview */

.overview-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  position: relative;
  z-index: 1;
}

.overview-card {
  background: radial-gradient(circle at top left, rgba(37, 99, 235, 0.35), #020617);
  border-radius: var(--radius-lg);
  padding: 20px 20px 18px;
  border: 1px solid rgba(30, 64, 175, 0.95);
  min-height: 170px;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-med), box-shadow var(--transition-med),
    border-color var(--transition-med), background var(--transition-med), filter var(--transition-med);
}

.overview-card::before {
  content: '';
  position: absolute;
  inset: -2px;
  background: radial-gradient(circle at 20% 0, rgba(52, 209, 255, 0.35), transparent 60%),
    radial-gradient(circle at 90% 30%, rgba(255, 47, 106, 0.22), transparent 62%),
    linear-gradient(135deg, rgba(56, 189, 248, 0.18), rgba(129, 140, 248, 0.12));
  opacity: 0.45;
  filter: blur(14px);
  pointer-events: none;
  transition: opacity var(--transition-med), filter var(--transition-med);
}

.overview-card::after {
  content: '';
  position: absolute;
  left: -40%;
  top: -60%;
  width: 180%;
  height: 180%;
  background: linear-gradient(
    115deg,
    transparent 0%,
    rgba(52, 209, 255, 0.12) 35%,
    rgba(255, 47, 106, 0.08) 50%,
    rgba(129, 140, 248, 0.12) 65%,
    transparent 100%
  );
  opacity: 0;
  transform: translate3d(-8%, 10%, 0) rotate(0.001deg);
  pointer-events: none;
}

.overview-card h3 {
  margin: 0 0 10px;
  font-size: 16px;
  position: relative;
  z-index: 1;
}

.overview-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.8;
  position: relative;
  z-index: 1;
}

.overview-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-soft);
  border-color: var(--accent);
  background: radial-gradient(circle at top left, rgba(52, 209, 255, 0.28), #060712);
}

.overview-card:hover::before {
  opacity: 0.85;
  filter: blur(18px);
}

.overview-card:hover::after {
  opacity: 1;
  animation: scanSweep 1.25s ease-out both;
}

.overview-link {
  display: block;
  color: inherit;
  text-decoration: none;
}

.overview-link:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px rgba(52, 209, 255, 0.65), 0 0 0 6px rgba(52, 209, 255, 0.18);
}

.overview-cta {
  margin-top: 12px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(52, 209, 255, 0.55);
  color: rgba(199, 210, 255, 0.95);
  background: radial-gradient(circle at top left, rgba(52, 209, 255, 0.18), rgba(15, 23, 42, 0.92));
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  position: relative;
  z-index: 1;
}

.overview-cta::after {
  content: '→';
  opacity: 0.9;
}

.overview-card:hover .overview-cta {
  border-color: rgba(255, 47, 106, 0.65);
  box-shadow: 0 0 18px rgba(52, 209, 255, 0.35);
}

/* Overview secondary pages */
.overview-detail-hero {
  position: relative;
  overflow: hidden;
}

.overview-detail-hero::before {
  content: '';
  position: absolute;
  inset: -35%;
  background: radial-gradient(circle at 10% 10%, rgba(56, 189, 248, 0.22), transparent 55%),
    radial-gradient(circle at 90% 20%, rgba(236, 72, 153, 0.18), transparent 55%),
    radial-gradient(circle at 50% 100%, rgba(129, 140, 248, 0.16), transparent 60%);
  opacity: 0.95;
  pointer-events: none;
  mix-blend-mode: screen;
  filter: blur(10px);
  animation: orbitGlow 32s linear infinite;
}

.overview-detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  position: relative;
  z-index: 1;
}

.overview-detail-card {
  border-radius: var(--radius-lg);
  padding: 22px 22px 18px;
  background: radial-gradient(circle at top left, rgba(52, 209, 255, 0.16), rgba(2, 6, 23, 0.96));
  border: 1px solid rgba(72, 85, 130, 0.9);
  box-shadow: 0 22px 55px rgba(0, 0, 0, 0.85);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-med), box-shadow var(--transition-med), border-color var(--transition-med);
}

.overview-detail-card::after {
  content: '';
  position: absolute;
  left: -40%;
  top: -60%;
  width: 180%;
  height: 180%;
  background: linear-gradient(
    115deg,
    transparent 0%,
    rgba(52, 209, 255, 0.12) 35%,
    rgba(255, 47, 106, 0.08) 50%,
    rgba(129, 140, 248, 0.12) 65%,
    transparent 100%
  );
  opacity: 0;
  pointer-events: none;
}

.overview-detail-card:hover {
  transform: translateY(-4px);
  border-color: rgba(52, 209, 255, 0.75);
  box-shadow: 0 0 0 1px rgba(52, 209, 255, 0.22), 0 28px 70px rgba(0, 0, 0, 0.9);
}

.overview-detail-card:hover::after {
  opacity: 1;
  animation: scanSweep 1.35s ease-out both;
}

.overview-detail-card h3 {
  margin: 0 0 10px;
  font-size: 16px;
  position: relative;
  z-index: 1;
}

.overview-detail-card p {
  margin: 0 0 10px;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.9;
  position: relative;
  z-index: 1;
}

.overview-detail-actions {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  position: relative;
  z-index: 1;
}

/* Programs */

.programs-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.program-card {
  border-radius: var(--radius-lg);
  padding: 20px 20px 18px;
  background: radial-gradient(circle at top left, rgba(37, 99, 235, 0.3), #020617);
  border: 1px solid rgba(30, 64, 175, 0.95);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform var(--transition-med), box-shadow var(--transition-med),
    border-color var(--transition-med), background var(--transition-med), filter var(--transition-med);
}

.program-card h3 {
  margin: 0;
  font-size: 16px;
}

.program-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.8;
}

.program-card ul {
  margin: 8px 0 14px;
  padding-left: 18px;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.7;
}

.program-card li + li {
  margin-top: 4px;
}

.program-card .btn {
  align-self: flex-start;
}

.card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 8px;
}

.card-actions .btn {
  align-self: auto;
}

.program-detail-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.program-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 6px;
}

.program-stats .metric {
  background: rgba(10, 12, 22, 0.82);
  border: 1px solid rgba(48, 61, 110, 0.9);
}

.program-detail-card {
  max-width: 820px;
  margin: 0 auto;
}

.badge {
  align-self: flex-start;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-size: 11px;
  border: 1px solid rgba(84, 96, 150, 0.9);
  color: var(--text-soft);
  margin-bottom: 4px;
}

.badge-highlight {
  border-color: rgba(255, 47, 106, 0.9);
  color: #ff8fad;
  background: rgba(255, 47, 106, 0.12);
}

.program-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-soft);
  border-color: var(--accent-strong);
  background: rgba(6, 11, 25, 0.98);
}

/* Coaches */

.coaches-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.coach-card {
  border-radius: var(--radius-lg);
  padding: 18px 18px 16px;
  background: radial-gradient(circle at top left, rgba(255, 149, 214, 0.3), #020617);
  border: 1px solid rgba(248, 113, 113, 0.9);
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: transform var(--transition-med), box-shadow var(--transition-med),
    border-color var(--transition-med), background var(--transition-med), filter var(--transition-med);
}

.coach-avatar {
  /* 更适合 1:1 甚至略偏竖版的人像比例 */
  aspect-ratio: 4 / 5;
  border-radius: 14px;
  margin-bottom: 4px;
  background-image: linear-gradient(180deg, rgba(15, 23, 42, 0.08), rgba(0, 0, 0, 0.7)),
    var(--coach-bg, url("../images/coach_placeholder.svg"));
  background-size: cover;
  background-position: center top;
  background-repeat: no-repeat;
  border: 1px solid rgba(120, 128, 180, 0.9);
  position: relative;
  overflow: hidden;
  isolation: isolate;
  transition: transform var(--transition-med), box-shadow var(--transition-med);
}

.coach-avatar::after {
  content: attr(data-initial);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 44px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: rgba(226, 232, 240, 0.82);
  text-shadow: 0 10px 30px rgba(0, 0, 0, 0.75), 0 0 26px rgba(52, 209, 255, 0.22);
  pointer-events: none;
  mix-blend-mode: screen;
  opacity: 0.9;
}

.coach-a {
  background-image: url("../images/coaches/lin.jpg");
}

.coach-b {
  background-image: url("../images/coaches/jun.jpg");
}

.coach-c {
  background-image: url("../images/coaches/ava.jpg");
}

.coach-card h3 {
  margin: 0;
  font-size: 15px;
}

.coach-link {
  color: inherit;
  text-decoration: none;
}

.coach-link:hover {
  color: #e5e7ff;
}

.coach-tags {
  margin: 0;
  font-size: 12px;
  color: var(--accent);
}

.coach-desc {
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.8;
}

.coach-card .btn {
  margin-top: 10px;
  align-self: flex-start;
}

.coach-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-soft);
  border-color: var(--accent-strong);
}

.coach-card:hover .coach-avatar {
  transform: translateY(-2px) scale(1.03);
}

/* Coach detail */
.coach-detail-hero {
  position: relative;
  overflow: hidden;
}

.coach-detail-hero::before {
  content: '';
  position: absolute;
  inset: -35%;
  background: radial-gradient(circle at 0% 0%, rgba(56, 189, 248, 0.24), transparent 55%),
    radial-gradient(circle at 100% 20%, rgba(236, 72, 153, 0.2), transparent 55%),
    radial-gradient(circle at 50% 100%, rgba(129, 140, 248, 0.18), transparent 60%);
  opacity: 0.95;
  pointer-events: none;
  mix-blend-mode: screen;
  filter: blur(10px);
  animation: orbitGlow 32s linear infinite;
}

.coach-detail-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 40px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.coach-detail-photo-card {
  border-radius: var(--radius-lg);
  padding: 18px 18px 16px;
  background: radial-gradient(circle at top left, rgba(255, 149, 214, 0.28), #020617);
  border: 1px solid rgba(248, 113, 113, 0.9);
  box-shadow: var(--shadow-soft);
  animation: cardFloat 9s ease-in-out infinite;
}

.coach-detail-avatar {
  aspect-ratio: 4 / 5;
  border-radius: 16px;
  border: 1px solid rgba(148, 163, 255, 0.9);
  background-image: linear-gradient(180deg, rgba(15, 23, 42, 0.08), rgba(0, 0, 0, 0.78)),
    var(--coach-bg, url("../images/coach_placeholder.svg"));
  background-size: cover;
  background-position: center top;
  background-repeat: no-repeat;
  overflow: hidden;
  position: relative;
  isolation: isolate;
}

.coach-detail-avatar::after {
  content: attr(data-initial);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 52px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: rgba(226, 232, 240, 0.82);
  text-shadow: 0 14px 40px rgba(0, 0, 0, 0.8), 0 0 30px rgba(236, 72, 153, 0.18);
  pointer-events: none;
  mix-blend-mode: screen;
  opacity: 0.9;
}

.coach-detail-tagline {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.badge-coach {
  border-color: rgba(248, 113, 113, 0.95);
  color: #fed7e2;
  background: rgba(190, 24, 93, 0.4);
}

.coach-detail-name {
  margin: 4px 0 0;
  font-size: 20px;
}

.coach-detail-tags {
  margin: 2px 0 0;
  font-size: 13px;
  color: var(--accent);
}

.coach-detail-intro {
  max-width: 520px;
}

.coach-detail-lead {
  margin: 0 0 18px;
  color: var(--text-muted);
  line-height: 1.9;
  font-size: 14px;
}

.coach-detail-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* AI Lab */

.ai-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.ai-panel {
  border-radius: var(--radius-lg);
  padding: 20px 20px 18px;
  background: radial-gradient(circle at top left, rgba(45, 212, 191, 0.24), #020617);
  border: 1px solid rgba(34, 197, 94, 0.85);
  transition: transform var(--transition-med), box-shadow var(--transition-med),
    border-color var(--transition-med), background var(--transition-med), filter var(--transition-med);
}

.ai-panel h3 {
  margin: 0 0 10px;
  font-size: 16px;
}

.ai-panel p {
  margin: 0;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.8;
}

.ai-panel ul {
  margin: 10px 0 0;
  padding-left: 18px;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.7;
}

.ai-panel li + li {
  margin-top: 4px;
}

.ai-panel.highlight {
  background: radial-gradient(circle at top left, rgba(255, 149, 214, 0.4), #020617);
  border-color: rgba(248, 113, 113, 0.95);
}

.ai-panel:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-soft);
  border-color: var(--accent);
}

/* Community */

.community-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.community-card {
  border-radius: var(--radius-lg);
  padding: 18px 18px 16px;
  background: radial-gradient(circle at top left, rgba(59, 130, 246, 0.24), #020617);
  border: 1px dashed rgba(55, 65, 81, 0.95);
  transition: transform var(--transition-med), box-shadow var(--transition-med),
    border-color var(--transition-med), background var(--transition-med), filter var(--transition-med);
}

.community-card h3 {
  margin: 0 0 8px;
  font-size: 15px;
}

.community-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.8;
}

.community-card .btn {
  margin-top: 12px;
  align-self: flex-start;
}

.community-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-soft);
  border-style: solid;
  border-color: var(--accent);
}

/* Join Us */

.join-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.join-panel {
  border-radius: var(--radius-lg);
  padding: 20px 20px 18px;
  background: radial-gradient(circle at top left, rgba(129, 140, 248, 0.35), #020617);
  border: 1px solid rgba(129, 140, 248, 0.95);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.join-panel h3 {
  margin: 0;
  font-size: 16px;
}

.join-panel p {
  margin: 0 0 8px;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.8;
}

.join-panel .btn {
  align-self: flex-start;
}

/* Founder */

.founder-hero {
  background: radial-gradient(circle at top left, #1f2937 0, #05060a 55%, #020308 100%);
}

.founder-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 40px;
  align-items: center;
}

.founder-photo-card {
  border-radius: var(--radius-lg);
  padding: 18px 18px 16px;
  background: radial-gradient(circle at top left, rgba(52, 209, 255, 0.18), #020617);
  border: 1px solid rgba(71, 85, 191, 0.9);
  box-shadow: var(--shadow-soft);
  animation: cardFloat 10s ease-in-out infinite;
}

.founder-photo {
  overflow: hidden;
  border-radius: 16px;
  border: 1px solid rgba(148, 163, 255, 0.8);
}

.founder-photo img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.founder-tagline {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.badge-founder {
  border-color: rgba(148, 163, 255, 0.9);
  color: #c7d2ff;
  background: rgba(55, 65, 194, 0.3);
}

.founder-name-cn {
  font-size: 18px;
  font-weight: 600;
}

.founder-name-en {
  font-size: 12px;
  color: var(--text-soft);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.founder-intro {
  max-width: 520px;
}

.founder-title {
  font-size: 28px;
  line-height: 1.4;
  margin: 12px 0 16px;
}

.founder-lead {
  margin: 0 0 18px;
  color: var(--text-muted);
  line-height: 1.9;
}

.founder-actions {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.founder-meta-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.founder-meta {
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(71, 85, 105, 0.9);
}

.founder-meta .meta-value {
  margin-top: 4px;
  font-size: 13px;
}

.founder-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px;
}

.founder-block {
  border-radius: var(--radius-lg);
  padding: 20px 20px 18px;
  background: rgba(9, 11, 22, 0.96);
  border: 1px solid rgba(63, 74, 125, 0.95);
}

.founder-block h2 {
  margin: 0 0 10px;
  font-size: 18px;
}

.founder-block p {
  margin: 0 0 8px;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.9;
}

.founder-timeline {
  border-radius: var(--radius-lg);
  padding: 18px 18px 4px;
  background: radial-gradient(circle at top left, rgba(52, 209, 255, 0.14), #020617);
  border: 1px solid rgba(56, 68, 148, 0.95);
}

.timeline-item {
  position: relative;
  padding-left: 22px;
  margin-bottom: 14px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 0;
  bottom: -10px;
  width: 1px;
  background: linear-gradient(to bottom, rgba(148, 163, 255, 0.2), rgba(15, 23, 42, 0.2));
}

.timeline-item:last-child::before {
  bottom: 0;
}

.timeline-dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  border: 2px solid rgba(129, 140, 248, 0.95);
  background: #020617;
  position: absolute;
  left: 2px;
  top: 4px;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

.timeline-content h3 {
  margin: 0 0 4px;
  font-size: 14px;
}

.timeline-content p {
  margin: 0 0 2px;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.8;
}

/* Footer */

.site-footer {
  border-top: 1px solid rgba(15, 23, 42, 0.95);
  padding: 36px 0 28px;
  background: radial-gradient(circle at top, #020617 0, #020617 55%, #000000 100%);
}

.footer-grid {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 18px;
}

.footer-slogan {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--text-muted);
}

.footer-columns {
  display: flex;
  gap: 56px;
}

.footer-col h4 {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.footer-col a,
.footer-col p {
  display: block;
  margin: 4px 0;
  font-size: 13px;
  color: var(--text-muted);
}

.footer-col a:hover {
  color: var(--accent);
}

.footer-bottom {
  border-top: 1px solid rgba(28, 32, 52, 0.9);
  padding-top: 10px;
}

.footer-bottom p {
  margin: 0;
  font-size: 12px;
  color: var(--text-soft);
  text-align: right;
}

/* Scroll reveal */

.reveal {
  opacity: 0;
  transform: translateY(24px) scale(0.98);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

@keyframes orbitGlow {
  0% {
    transform: translate3d(0, 0, 0) rotate(0deg);
  }
  50% {
    transform: translate3d(0, -2%, 0) rotate(180deg);
  }
  100% {
    transform: translate3d(0, 0, 0) rotate(360deg);
  }
}

@keyframes cardFloat {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-4px);
  }
  100% {
    transform: translateY(0);
  }
}

@keyframes pulseRing {
  0% {
    box-shadow: 0 0 0 0 rgba(52, 209, 255, 0.4);
  }
  70% {
    box-shadow: 0 0 0 18px rgba(52, 209, 255, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(52, 209, 255, 0);
  }
}

@keyframes scanSweep {
  0% {
    transform: translate3d(-14%, 14%, 0) rotate(0.001deg);
    opacity: 0;
  }
  15% {
    opacity: 1;
  }
  100% {
    transform: translate3d(14%, -14%, 0) rotate(0.001deg);
    opacity: 0;
  }
}

/* Responsive */

@media (max-width: 960px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-visual {
    order: -1;
  }

  .hero-subtitle {
    max-width: none;
  }

  .overview-grid,
  .programs-grid,
  .coaches-grid,
  .ai-grid,
  .community-grid,
  .join-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-columns {
    gap: 32px;
  }
}

@media (max-width: 720px) {
  .nav-container {
    padding-inline: 0;
  }

  .main-nav,
  .nav-actions {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .main-nav.open,
  .nav-actions.open {
    display: flex;
  }

  .main-nav {
    position: absolute;
    top: 56px;
    left: 20px;
    right: 20px;
    flex-direction: column;
    padding: 14px 16px;
    border-radius: 16px;
    background: rgba(3, 5, 15, 0.98);
    border: 1px solid rgba(50, 60, 100, 0.95);
    z-index: 40;
  }

  .nav-actions {
    position: absolute;
    top: 56px;
    right: 24px;
    flex-direction: row;
  }

  .hero-metas {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 72px 0;
  }

  .overview-grid,
  .programs-grid,
  .coaches-grid,
  .ai-grid,
  .community-grid,
  .join-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .founder-layout,
  .founder-grid,
  .coach-detail-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .overview-detail-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-grid {
    flex-direction: column;
    gap: 24px;
  }

  .footer-columns {
    flex-wrap: wrap;
    gap: 24px;
  }

  .footer-bottom p {
    text-align: left;
  }
}