/*
 * Schola — 首页专属样式
 * 依赖 design-system.css + nav-footer.css
 */

/* ============================================================
   通用首页工具
   ============================================================ */
.section { padding-block: var(--section-gap); }
.section--alt { background-color: var(--color-surface); }
.section--dark {
  background-color: var(--color-text-primary);
  color: var(--color-bg);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-brand);
  margin-bottom: 1.25rem;
}

.section-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: 0.875rem;
}

.reveal {
  opacity: 0;
  transition: opacity 500ms ease;
}
.reveal.visible { opacity: 1; }

/* ============================================================
   1. Hero — 两栏布局
   ============================================================ */
.hero {
  padding-block: clamp(4rem, 10vw, 8rem) clamp(3rem, 6vw, 5rem);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(15, 107, 104, 0.05) 0%, transparent 60%),
    radial-gradient(circle at 80% 20%, rgba(139, 175, 144, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  max-width: var(--width-wide);
  margin-inline: auto;
  padding-inline: clamp(1.5rem, 5vw, 3rem);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
}

@media (max-width: 899px) {
  .hero__inner {
    grid-template-columns: 1fr;
  }
  .hero__visual {
    display: none;
  }
}

.hero__content {
  max-width: 560px;
}

.hero__title {
  font-size: var(--text-hero);
  font-family: var(--font-display);
  line-height: 1.08;
  color: var(--color-text-primary);
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.hero__subtitle {
  font-size: clamp(1rem, 0.9rem + 0.5vw, 1.2rem);
  color: var(--color-text-secondary);
  line-height: 1.65;
  max-width: 480px;
  margin-bottom: 2rem;
}

.hero__cta-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0.875rem;
}

.hero__microcopy {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: 400px;
}

.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-divider);
}

.hero__stat-value {
  font-size: clamp(1.5rem, 1rem + 1.5vw, 2.25rem);
  font-family: var(--font-display);
  color: var(--color-text-primary);
  line-height: 1;
  margin-bottom: 0.25rem;
}
.hero__stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
}

/* ============================================================
   Hero 右侧 — AI Token 流动动画
   ============================================================ */
.hero__visual {
  position: relative;
  height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 外层容器：圆角卡片 + 磨砂背景 */
.ai-flow {
  width: 100%;
  height: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  gap: 0.75rem;
}

/* 顶部标题栏 */
.ai-flow__header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-bottom: 0.875rem;
  border-bottom: 1px solid var(--color-divider);
  flex-shrink: 0;
}

.ai-flow__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-brand);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.ai-flow__label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-brand);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* 流动 token 区域 */
.ai-flow__stream {
  flex: 1;
  overflow: hidden;
  position: relative;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 12px;
  line-height: 1.7;
}

/* 每一行 token */
.token-line {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  margin-bottom: 6px;
  opacity: 0;
  animation: line-appear 0.4s ease forwards;
}

@keyframes line-appear {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* 单个 token */
.token {
  display: inline-block;
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 11px;
  opacity: 0;
  animation: token-pop 0.2s ease forwards;
}

@keyframes token-pop {
  from { opacity: 0; transform: scale(0.85); }
  to   { opacity: 1; transform: scale(1); }
}

/* token 颜色分类 */
.token--school   { background: rgba(15,107,104,0.12); color: var(--color-brand); }
.token--fee      { background: rgba(139,175,144,0.15); color: #3a7a50; }
.token--number   { background: rgba(214,137,16,0.12); color: #9a6200; }
.token--keyword  { background: rgba(26,107,138,0.12); color: #1a6b8a; }
.token--plain    { background: transparent; color: var(--color-text-secondary); }
.token--source   { background: rgba(15,107,104,0.06); color: var(--color-text-muted); font-size: 10px; }

[data-theme="dark"] .token--fee    { color: #8BAF90; }
[data-theme="dark"] .token--number { color: #D4A85A; }

/* 光标闪烁 */
.ai-cursor {
  display: inline-block;
  width: 2px;
  height: 14px;
  background: var(--color-brand);
  margin-left: 2px;
  vertical-align: middle;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* 底部状态栏 */
.ai-flow__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-divider);
  flex-shrink: 0;
}

.ai-flow__tokens-used {
  font-size: 10px;
  color: var(--color-text-muted);
  font-family: monospace;
}

.ai-flow__sources {
  font-size: 10px;
  color: var(--color-brand);
  opacity: 0.7;
}

/* 背景光晕（装饰） */
.ai-flow::after {
  content: '';
  position: absolute;
  bottom: -40px;
  right: -40px;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(15,107,104,0.08) 0%, transparent 70%);
  pointer-events: none;
}

/* ============================================================
   产品预览区（Hero 下方）
   ============================================================ */
.hero-preview {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
  padding-block: clamp(2rem, 5vw, 4rem);
}

.preview-frame {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  max-width: 900px;
  margin-inline: auto;
}

.preview-frame__bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  background-color: var(--color-surface-alt);
  border-bottom: 1px solid var(--color-divider);
}

.preview-frame__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-divider);
}

.preview-frame__url {
  flex: 1;
  height: 22px;
  background-color: var(--color-bg);
  border-radius: 4px;
  border: 1px solid var(--color-divider);
  margin-inline: 8px;
}

.preview-frame__body {
  padding: 1.5rem;
  min-height: 280px;
  display: flex;
  gap: 1rem;
}

.preview-sidebar { width: 180px; flex-shrink: 0; }
.preview-sidebar__item {
  height: 28px;
  background-color: var(--color-surface-alt);
  border-radius: 6px;
  margin-bottom: 8px;
}
.preview-sidebar__item--active {
  background-color: var(--color-brand-light);
  border: 1px solid var(--color-brand-mid);
}

.preview-chat { flex: 1; display: flex; flex-direction: column; gap: 12px; }

.preview-msg {
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.5;
  max-width: 75%;
}
.preview-msg--user {
  align-self: flex-end;
  background-color: var(--color-brand);
  color: #fff;
}
.preview-msg--ai {
  align-self: flex-start;
  background-color: var(--color-surface-alt);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-divider);
}

.preview-msg--ai .preview-msg__lines { display: flex; flex-direction: column; gap: 6px; }
.preview-msg__line {
  height: 10px;
  border-radius: 3px;
  background-color: var(--color-divider);
}
.preview-msg__line--short { width: 60%; }
.preview-msg__line--med   { width: 85%; }
.preview-msg__line--long  { width: 100%; }

/* ============================================================
   2. Capability Strip
   ============================================================ */
.capability-strip {
  padding-block: 1.5rem;
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
  overflow: hidden;
}

.capability-strip__inner {
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  padding-inline: clamp(1rem, 4vw, 2rem);
  max-width: var(--width-wide);
  margin-inline: auto;
}
.capability-strip__inner::-webkit-scrollbar { display: none; }

.capability-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding-inline: 1.25rem;
  flex-shrink: 0;
}
.capability-item:first-child { padding-left: 0; }

.capability-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--color-brand-mid);
  flex-shrink: 0;
}

/* ============================================================
   3. Problem / Solution
   ============================================================ */
.problem-solution {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: start;
}

@media (max-width: 699px) {
  .problem-solution { grid-template-columns: 1fr; }
}

.ps-col__header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1.25rem;
  padding-bottom: 0.875rem;
  border-bottom: 1px solid var(--color-divider);
}

.ps-col__header--problem { color: var(--color-text-muted); }
.ps-col__header--solution { color: var(--color-brand); }

.ps-item {
  display: flex;
  gap: 0.875rem;
  padding-block: 0.875rem;
  border-bottom: 1px solid var(--color-divider);
}
.ps-item:last-child { border-bottom: none; }

.ps-item__icon { width: 20px; height: 20px; flex-shrink: 0; margin-top: 2px; }
.ps-item__text { font-size: var(--text-sm); color: var(--color-text-secondary); line-height: 1.6; }

/* ============================================================
   4. AI Demo
   ============================================================ */
.ai-demo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
}

@media (max-width: 799px) {
  .ai-demo { grid-template-columns: 1fr; }
}

.ai-demo__copy h2 { font-size: var(--text-h1); margin-bottom: 1rem; }
.ai-demo__copy p { font-size: var(--text-body); color: var(--color-text-secondary); line-height: 1.7; margin-bottom: 1.5rem; }

.chat-demo {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.chat-demo__header {
  padding: 0.875rem 1.25rem;
  border-bottom: 1px solid var(--color-divider);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.chat-demo__title { font-size: var(--text-xs); font-weight: 600; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.08em; }
.chat-demo__body { padding: 1.25rem; display: flex; flex-direction: column; gap: 1rem; }

.demo-bubble {
  border-radius: 10px;
  padding: 0.75rem 1rem;
  font-size: 13px;
  line-height: 1.6;
  max-width: 85%;
}
.demo-bubble--user { align-self: flex-end; background-color: var(--color-brand); color: #fff; }
.demo-bubble--ai { align-self: flex-start; background-color: var(--color-bg); border: 1px solid var(--color-border); color: var(--color-text-primary); }
.demo-bubble--ai strong { color: var(--color-brand); }

.chat-demo__source { font-size: 11px; color: var(--color-text-muted); padding: 0 1.25rem 1rem; }

.chat-demo__input {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1rem;
  border-top: 1px solid var(--color-divider);
  background-color: var(--color-bg);
}

.chat-demo__input-bar { flex: 1; height: 36px; background-color: var(--color-surface-alt); border-radius: var(--radius-pill); border: 1px solid var(--color-border); }
.chat-demo__send-btn { width: 32px; height: 32px; border-radius: 50%; background-color: var(--color-brand); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }

/* ============================================================
   5. Features Grid
   ============================================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1rem;
}

.feature-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-btn), border-color var(--transition-btn);
}
.feature-card:hover { box-shadow: var(--shadow-md); border-color: var(--color-brand-mid); }

.feature-card--lg    { grid-column: span 7; }
.feature-card--sm    { grid-column: span 5; }
.feature-card--third { grid-column: span 4; }

@media (max-width: 899px) {
  .feature-card--lg, .feature-card--sm, .feature-card--third { grid-column: span 12; }
}
@media (min-width: 600px) and (max-width: 899px) {
  .feature-card--third { grid-column: span 6; }
}

.feature-card__icon {
  width: 36px; height: 36px;
  background-color: var(--color-brand-light);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1rem;
  color: var(--color-brand);
}
.feature-card__title { font-size: var(--text-h3); font-weight: 600; color: var(--color-text-primary); margin-bottom: 0.5rem; }
.feature-card__desc { font-size: var(--text-sm); color: var(--color-text-secondary); line-height: 1.65; }

/* ============================================================
   6. How it works
   ============================================================ */
.how-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  counter-reset: step;
}

@media (max-width: 699px) {
  .how-steps { grid-template-columns: 1fr; }
}

.how-step__number {
  font-size: clamp(3rem, 6vw, 5rem);
  font-family: var(--font-display);
  color: var(--color-brand-light);
  line-height: 1;
  margin-bottom: 0.5rem;
  transition: color 300ms;
}
[data-theme="dark"] .how-step__number { color: var(--color-brand-mid); }

.how-step__title { font-size: var(--text-h3); font-weight: 600; color: var(--color-text-primary); margin-bottom: 0.5rem; }
.how-step__desc { font-size: var(--text-sm); color: var(--color-text-secondary); line-height: 1.65; }

/* ============================================================
   7. Invite
   ============================================================ */
.invite-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 2rem;
}
@media (max-width: 599px) { .invite-grid { grid-template-columns: 1fr; } }

.invite-card { background-color: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-card); padding: 2rem; }
.invite-card--featured { border-color: var(--color-brand-mid); background-color: var(--color-brand-light); }

.invite-card__label { font-size: var(--text-xs); font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; color: var(--color-brand); margin-bottom: 0.75rem; }
.invite-card__title { font-size: var(--text-h3); font-weight: 600; color: var(--color-text-primary); margin-bottom: 0.5rem; }
.invite-card__desc { font-size: var(--text-sm); color: var(--color-text-secondary); line-height: 1.65; margin-bottom: 1.5rem; }
.invite-card__perks { list-style: none; margin-bottom: 1.5rem; display: flex; flex-direction: column; gap: 0.5rem; }
.invite-card__perk { display: flex; align-items: center; gap: 0.5rem; font-size: var(--text-sm); color: var(--color-text-secondary); }
.invite-card__perk-dot { width: 6px; height: 6px; border-radius: 50%; background-color: var(--color-brand); flex-shrink: 0; }

/* ============================================================
   8. Dimensions
   ============================================================ */
.dimensions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.75rem;
  margin-top: 2rem;
}

.dimension-item {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  padding: 0.875rem 1rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  transition: border-color var(--transition-btn), background-color var(--transition-btn);
}
.dimension-item:hover { border-color: var(--color-brand-mid); background-color: var(--color-brand-light); }
.dimension-item__dot { width: 6px; height: 6px; border-radius: 50%; background-color: var(--color-accent); flex-shrink: 0; margin-top: 6px; }
.dimension-item__text { font-size: var(--text-xs); font-weight: 500; color: var(--color-text-secondary); line-height: 1.4; }

/* ============================================================
   9. Bottom CTA
   ============================================================ */
.bottom-cta {
  background-color: var(--color-text-primary);
  color: var(--color-bg);
  padding-block: clamp(4rem, 8vw, 6rem);
  text-align: left;
}
[data-theme="dark"] .bottom-cta { background-color: var(--color-surface); border-top: 1px solid var(--color-divider); color: var(--color-text-primary); }
.bottom-cta h2 { font-size: var(--text-h1); color: inherit; margin-bottom: 1rem; max-width: 640px; }
.bottom-cta p { font-size: var(--text-body); opacity: 0.7; max-width: 480px; margin-bottom: 2rem; line-height: 1.65; }

.btn-outline-light { background-color: transparent; color: var(--color-bg); border-color: rgba(248,247,242,0.3); }
.btn-outline-light:hover { background-color: rgba(248,247,242,0.1); border-color: rgba(248,247,242,0.6); color: var(--color-bg); }
[data-theme="dark"] .btn-outline-light { color: var(--color-text-primary); border-color: var(--color-border); }
[data-theme="dark"] .btn-outline-light:hover { background-color: var(--color-brand-light); border-color: var(--color-brand); color: var(--color-brand); }

/* ============================================================
   响应式补充
   ============================================================ */
@media (max-width: 599px) {
  .hero__cta-group { flex-direction: column; align-items: flex-start; }
  .hero__stats { gap: 1.25rem; }
  .preview-frame__body { flex-direction: column; }
  .preview-sidebar { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}