/* ============================================================
   AI Vision · 全局样式
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;600;700&family=Inter:wght@400;500;600&display=swap');

/* ---------- CSS Variables ---------- */
:root {
  --bg:         #0a0a0f;
  --bg-card:    #111118;
  --bg-card-hover: #18181f;
  --border:     rgba(255,255,255,0.07);
  --text-primary:   #f0ede6;
  --text-secondary: #8a8799;
  --text-muted:    #55535f;

  /* tag colors */
  --tag-purple-bg:  rgba(127,119,221,0.12);
  --tag-purple-text:#a09be8;
  --tag-purple-bar: #7F77DD;

  --tag-blue-bg:   rgba(55,138,221,0.12);
  --tag-blue-text: #72b4ef;
  --tag-blue-bar:  #378ADD;

  --tag-red-bg:    rgba(210,60,60,0.12);
  --tag-red-text:  #e07070;
  --tag-red-bar:   #e24b4a;

  --tag-green-bg:  rgba(99,153,34,0.12);
  --tag-green-text:#8ec45a;
  --tag-green-bar: #639922;

  --tag-amber-bg:  rgba(186,117,23,0.12);
  --tag-amber-text:#e0a84a;
  --tag-amber-bar: #BA7517;

  --font-serif: 'Noto Serif SC', 'Songti SC', 'SimSun', Georgia, serif;
  --font-sans:  'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  --radius-card: 12px;
  --transition:  0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 80px 40px 60px;
  position: relative;
  overflow: hidden;
}

/* Subtle grid background */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

/* Radial glow behind content */
.hero::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -55%);
  width: 800px;
  height: 500px;
  background: radial-gradient(ellipse, rgba(127,119,221,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 1200px;
  width: 100%;
}

.hero-label {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--tag-purple-text);
  background: var(--tag-purple-bg);
  border: 1px solid rgba(127,119,221,0.25);
  padding: 5px 16px;
  border-radius: 100px;
  margin-bottom: 40px;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.hero-label.visible { opacity: 1; transform: translateY(0); }

.hero-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 48px;
}

.hero-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px 36px;
  text-align: left;
  position: relative;
  overflow: hidden;
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s ease, transform 0.7s ease, border-color var(--transition), background var(--transition);
}

.hero-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.hero-card:nth-child(2) { transition-delay: 0.12s; }

.hero-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--card-accent, var(--tag-purple-bar)), transparent);
  opacity: 0.6;
}

.hero-card:hover {
  border-color: rgba(255,255,255,0.14);
  background: var(--bg-card-hover);
}

.hero-card-quote {
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.4vw, 26px);
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.55;
  margin-bottom: 28px;
  letter-spacing: -0.01em;
}

.hero-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.hero-card-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.hero-card-title {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.hero-scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  opacity: 0;
  transition: opacity 0.8s ease 0.5s;
}

.hero-scroll-hint.visible { opacity: 1; }

.hero-scroll-hint span {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero-arrow {
  width: 18px;
  height: 18px;
  border-right: 2px solid var(--text-muted);
  border-bottom: 2px solid var(--text-muted);
  transform: rotate(45deg);
  animation: arrow-bounce 2s ease-in-out infinite;
}

@keyframes arrow-bounce {
  0%, 100% { transform: rotate(45deg) translateY(0); opacity: 0.5; }
  50%       { transform: rotate(45deg) translateY(4px); opacity: 1; }
}

/* ============================================================
   SECTION HEADER
   ============================================================ */
.section-header {
  text-align: center;
  padding: 20px 40px 60px;
  max-width: 900px;
  margin: 0 auto;
}

.section-header h2 {
  font-family: var(--font-serif);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.section-header h2.visible { opacity: 1; transform: translateY(0); }

.section-header p {
  font-size: 14px;
  color: var(--text-secondary);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease 0.1s, transform 0.6s ease 0.1s;
}

.section-header p.visible { opacity: 1; transform: translateY(0); }

/* ============================================================
   QUOTE GRID
   ============================================================ */
.quotes-section {
  padding: 0 40px 80px;
  max-width: 1200px;
  margin: 0 auto;
}

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

/* ---------- Quote Card ---------- */
.quote-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 28px 24px 24px;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 0;
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease,
    border-color var(--transition),
    background var(--transition);
  cursor: default;
}

.quote-card.visible {
  opacity: 1;
  transform: translateY(0);
}

/* colored left bar */
.quote-card::before {
  content: '';
  position: absolute;
  top: 16px; left: 0;
  width: 3px;
  height: calc(100% - 32px);
  border-radius: 0 2px 2px 0;
  transition: height var(--transition);
}

.quote-card:hover {
  border-color: rgba(255,255,255,0.12);
  background: var(--bg-card-hover);
}

.quote-card:hover::before {
  height: calc(100% - 24px);
}

.quote-card-tag {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 100px;
  margin-bottom: 14px;
  margin-left: 12px;
  align-self: flex-start;
}

.quote-card-quote {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 400;
  color: var(--text-primary);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

.quote-card-divider {
  width: 24px;
  height: 1px;
  background: rgba(255,255,255,0.1);
  margin-bottom: 16px;
  margin-left: 12px;
}

.quote-card-origin {
  padding-left: 12px;
}

.quote-card-origin-en {
  font-size: 11px;
  color: var(--text-muted);
  font-style: italic;
  line-height: 1.6;
  margin-bottom: 12px;
}

.quote-card-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.quote-card-title {
  font-size: 11px;
  color: var(--text-secondary);
  line-height: 1.4;
  margin-top: 2px;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 40px;
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
}

/* ============================================================
   COLOR VARIANTS
   ============================================================ */

/* purple */
.tag-purple { background: var(--tag-purple-bg); color: var(--tag-purple-text); }
.card-purple::before { background: var(--tag-purple-bar); }
.card-purple { --card-accent: var(--tag-purple-bar); }

/* blue */
.tag-blue { background: var(--tag-blue-bg); color: var(--tag-blue-text); }
.card-blue::before { background: var(--tag-blue-bar); }
.card-blue { --card-accent: var(--tag-blue-bar); }

/* red */
.tag-red { background: var(--tag-red-bg); color: var(--tag-red-text); }
.card-red::before { background: var(--tag-red-bar); }
.card-red { --card-accent: var(--tag-red-bar); }

/* green */
.tag-green { background: var(--tag-green-bg); color: var(--tag-green-text); }
.card-green::before { background: var(--tag-green-bar); }
.card-green { --card-accent: var(--tag-green-bar); }

/* amber */
.tag-amber { background: var(--tag-amber-bg); color: var(--tag-amber-text); }
.card-amber::before { background: var(--tag-amber-bar); }
.card-amber { --card-accent: var(--tag-amber-bar); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .quotes-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hero { padding: 80px 24px 60px; }
  .hero-cards { grid-template-columns: 1fr; gap: 16px; }
  .hero-card { padding: 28px 24px; }
  .section-header { padding: 20px 24px 40px; }
  .quotes-section { padding: 0 24px 60px; }
  .quotes-grid { grid-template-columns: 1fr; }
  .site-footer { padding: 24px; }
}