/* 银子教学创作工坊 · 官网子页样式系统
   遵循 site-final 工业设计标准与东方典雅色调：
   深邃背景、青翠与红金点缀、清晰字阶、无溢出、无障碍友好
*/

:root {
  color-scheme: dark;
  --bg: #0c151a;
  --bg-subtle: #101c22;
  --panel: #14232b;
  --panel-card: #182b35;
  --panel-hover: #1c323e;
  --panel-active: #223c4a;
  --text: #ebf3f2;
  --muted: #8ea5af;
  --faint: #5a737f;
  --line: #263c47;
  --line-light: #354e5b;
  --mint: #7fe2be;
  --mint-deep: #256b56;
  --gold: #e5be77;
  --red: #e05247;
  --font-main: "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, sans-serif;
  --font-serif: "Songti SC", "SimSun", "STSong", serif;
  --font-mono: "Consolas", "Courier New", monospace;
  --max-w: 1240px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-main);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, #172c38 0%, #0c151a 70%);
  color: var(--text);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s, border-color 0.2s;
}

button {
  font: inherit;
  color: inherit;
  border: 0;
  background: none;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 4px;
}

.wrap {
  width: min(var(--max-w), calc(100% - 48px));
  margin: 0 auto;
}

/* 顶部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(12, 21, 26, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav-bar {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-group img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.brand-title {
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-title span {
  font-weight: 400;
  color: var(--muted);
  font-size: 14px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 13px;
}

.nav-links a {
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--mint);
}

/* 英雄区 Hero */
.hero-section {
  padding: 64px 0 48px;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  border-radius: 20px;
  background: rgba(127, 226, 190, 0.1);
  border: 1px solid rgba(127, 226, 190, 0.25);
  color: var(--mint);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.badge-tag .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 8px var(--mint);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: end;
}

.hero-title {
  font-size: clamp(34px, 4.8vw, 56px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.hero-title em {
  font-style: normal;
  color: var(--mint);
}

.hero-lead {
  font-size: 16px;
  color: var(--muted);
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 24px;
  border-radius: 12px;
}

.hero-meta-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  font-size: 12px;
}

.hero-meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero-meta-item span {
  color: var(--faint);
}

.hero-meta-item strong {
  color: var(--text);
  font-weight: 500;
}

/* 诗词联动推荐卡片 */
.banner-poetry {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  background: linear-gradient(90deg, #162421 0%, #1a2a26 100%);
  border: 1px solid #2d4740;
  border-radius: 12px;
  padding: 16px 24px;
  margin: 12px 0 48px;
  transition: transform 0.2s, border-color 0.2s;
}

.banner-poetry:hover {
  transform: translateY(-2px);
  border-color: var(--mint);
}

.banner-left {
  display: flex;
  align-items: center;
  gap: 18px;
}

.banner-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(127, 226, 190, 0.15);
  color: var(--mint);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.banner-title {
  font-size: 16px;
  font-weight: 600;
  color: #f0ede6;
  margin-bottom: 2px;
}

.banner-desc {
  font-size: 13px;
  color: #9cb2a9;
}

.banner-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--mint);
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
}

/* 能力板块通用结构 */
.section-block {
  padding: 48px 0;
  border-top: 1px solid var(--line);
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 30px;
  margin-bottom: 32px;
}

.section-eyebrow {
  color: var(--mint);
  font-size: 12px;
  letter-spacing: 0.12em;
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.section-title {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.section-summary {
  max-width: 440px;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.8;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  transition: all 0.2s;
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: var(--mint-deep);
  color: #fff;
  border: 1px solid rgba(127, 226, 190, 0.4);
}

.btn-primary:hover {
  background: #2f836a;
  border-color: var(--mint);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--line);
}

.btn-secondary:hover {
  background: var(--panel-hover);
  border-color: var(--line-light);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: var(--mint);
  border: 1px solid transparent;
  padding: 6px 12px;
}

.btn-ghost:hover {
  background: rgba(127, 226, 190, 0.1);
}

.btn-icon-only {
  width: 38px;
  height: 38px;
  padding: 0;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--panel-card);
  border: 1px solid var(--line);
}

.btn-icon-only:hover {
  border-color: var(--mint);
  color: var(--mint);
}

/* 模块 1：音乐试听与波形展示 */
.music-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.music-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  transition: border-color 0.2s;
}

.music-card:hover {
  border-color: var(--line-light);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.card-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(127, 226, 190, 0.12);
  color: var(--mint);
  font-size: 11px;
  font-family: var(--font-mono);
}

.card-license {
  font-size: 11px;
  color: var(--faint);
}

.music-info h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 6px;
}

.prompt-box {
  background: var(--bg-subtle);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

.prompt-box strong {
  color: var(--text);
  font-weight: 600;
  margin-right: 6px;
}

/* 真实波形交互容器 */
.waveform-wrap {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 14px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.waveform-timeline {
  height: 48px;
  display: flex;
  align-items: center;
  gap: 2px;
  cursor: pointer;
  position: relative;
  touch-action: none;
}

.waveform-bar {
  flex: 1;
  background: #2a3e47;
  border-radius: 1px;
  transition: background 0.1s, transform 0.1s;
  min-height: 4px;
}

.waveform-bar.passed {
  background: var(--mint);
}

.waveform-bar.current {
  background: #ffffff;
  transform: scaleY(1.15);
}

.waveform-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  color: var(--faint);
  font-variant-numeric: tabular-nums;
}

.audio-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 4px;
}

.audio-play-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-play {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--mint);
  color: #0c151a;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  transition: transform 0.15s, background 0.15s;
}

.btn-play:hover {
  transform: scale(1.05);
  background: #99ebd0;
}

.audio-duration {
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--muted);
}

.card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  padding-top: 14px;
  margin-top: 4px;
  font-size: 12px;
}

.perf-spec {
  color: var(--muted);
}

.perf-spec em {
  font-style: normal;
  color: var(--gold);
}

/* 模块 2：可编辑 PPT 课件 */
.ppt-container {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 28px;
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 32px;
}

.ppt-preview-stage {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.slide-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.45);
}

.slide-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.slide-overlay-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(12, 21, 26, 0.85);
  border: 1px solid var(--line);
  color: var(--mint);
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
}

.ppt-nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-arrow-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.slide-page-badge {
  font-size: 14px;
  font-family: var(--font-mono);
  color: var(--muted);
}

.slide-page-badge strong {
  color: var(--mint);
  font-weight: 700;
}

/* 课件缩略图导航条 */
.ppt-thumbs {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
  margin-top: 4px;
}

.thumb-item {
  aspect-ratio: 16 / 9;
  border-radius: 4px;
  border: 2px solid var(--line);
  overflow: hidden;
  background: #000;
  padding: 0;
  cursor: pointer;
  position: relative;
  transition: border-color 0.2s, transform 0.15s;
}

.thumb-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.thumb-item:hover img {
  opacity: 0.95;
}

.thumb-item.active {
  border-color: var(--mint);
}

.thumb-item.active img {
  opacity: 1;
}

.thumb-label {
  position: absolute;
  bottom: 2px;
  right: 4px;
  font-size: 9px;
  background: rgba(0, 0, 0, 0.7);
  padding: 0 4px;
  border-radius: 2px;
  color: #fff;
  font-family: var(--font-mono);
}

/* 课件详细信息区 */
.ppt-details {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 20px;
}

.ppt-headings h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.ppt-headings p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 16px;
}

.ppt-feature-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
  font-size: 13px;
}

.ppt-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--muted);
}

.ppt-feature-item svg {
  color: var(--mint);
  flex-shrink: 0;
  margin-top: 2px;
}

.ppt-feature-item strong {
  color: var(--text);
  font-weight: 500;
}

.ppt-boundary-card {
  background: var(--bg-subtle);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  font-size: 12px;
  line-height: 1.75;
  color: var(--muted);
}

.ppt-boundary-card summary {
  cursor: pointer;
  color: var(--gold);
  font-weight: 600;
  margin-bottom: 6px;
}

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

/* 模块 3：声音克隆流程与需求复制 */
.voice-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.voice-flow-card,
.voice-sample-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.voice-flow-steps {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.flow-step {
  display: flex;
  gap: 14px;
}

.step-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(127, 226, 190, 0.15);
  border: 1px solid rgba(127, 226, 190, 0.3);
  color: var(--mint);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step-body h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}

.step-body p {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.7;
}

.voice-policy-box {
  background: rgba(224, 82, 71, 0.08);
  border: 1px solid rgba(224, 82, 71, 0.3);
  border-radius: 8px;
  padding: 14px;
  font-size: 12px;
  color: #e49994;
  line-height: 1.75;
}

.voice-policy-box strong {
  color: #ff857b;
  display: block;
  margin-bottom: 4px;
}

.voice-meta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  font-size: 12px;
}

.voice-meta-item {
  background: var(--bg-subtle);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
}

.voice-meta-item span {
  display: block;
  font-size: 11px;
  color: var(--faint);
  margin-bottom: 4px;
}

.voice-meta-item strong {
  color: var(--text);
  font-weight: 600;
}

/* 事实与版权声明框 Facts Band */
.legal-band {
  background: var(--panel-card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 24px;
  margin-top: 48px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  font-size: 13px;
  line-height: 1.85;
  color: var(--muted);
}

.legal-col h4 {
  font-size: 14px;
  color: var(--text);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.legal-col h4 svg {
  color: var(--gold);
}

.legal-col a {
  color: var(--mint);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 页脚 Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 40px 0 60px;
  margin-top: 48px;
  background: var(--bg);
  font-size: 12px;
  color: var(--muted);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 600;
}

.footer-nav {
  display: flex;
  gap: 20px;
}

.footer-nav a:hover {
  color: var(--mint);
}

/* 消息轻提示 Toast */
.toast-notice {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--mint);
  color: #0c151a;
  padding: 10px 22px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 99;
}

.toast-notice.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* 响应式断点适配：320px、390px、768px、1024px、1440px */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .ppt-container {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

@media (max-width: 768px) {
  .wrap {
    width: calc(100% - 32px);
  }
  .site-header {
    height: auto;
  }
  .nav-bar {
    height: 64px;
  }
  .nav-links {
    gap: 14px;
    font-size: 12px;
  }
  .music-grid,
  .voice-layout,
  .legal-band {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  .banner-poetry {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding: 16px;
  }
  .banner-arrow {
    align-self: flex-end;
  }
  .ppt-thumbs {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 420px) {
  .wrap {
    width: calc(100% - 24px);
  }
  .hero-title {
    font-size: 28px;
  }
  .hero-meta-list {
    grid-template-columns: 1fr;
  }
  .music-card,
  .voice-flow-card,
  .voice-sample-card,
  .ppt-container {
    padding: 18px 14px;
  }
  .ppt-thumbs {
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
  }
  .audio-controls {
    flex-wrap: wrap;
  }
  .card-foot {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
  }
}

/* 动效缩减 prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto !important;
  }
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

/* Keep intrinsic slide/control widths from expanding small viewports. */
.ppt-preview-stage,.ppt-details,.hero-grid>* {min-width:0}
.waveform-timeline:focus-visible {outline:2px solid var(--mint);outline-offset:4px}
@media(max-width:600px){.nav-bar{align-items:flex-start;flex-direction:column;gap:14px}.brand-title{white-space:nowrap}.nav-links{width:100%;justify-content:flex-start;flex-wrap:wrap;gap:12px}.nav-links a{white-space:nowrap}.ppt-nav-bar{flex-wrap:wrap;gap:14px}.ppt-actions{width:100%}.ppt-actions .btn{white-space:normal;max-width:100%}.ppt-thumbs{grid-template-columns:repeat(3,minmax(0,1fr))}.voice-meta-grid{grid-template-columns:1fr}}
@media(max-width:380px){.brand-title{white-space:normal;flex-wrap:wrap;font-size:13px}.brand-group{gap:8px;max-width:100%}}