/* =======================================================
   Tide 潮汐 · 现代设计系统规范 (紧凑型网格 & 明朗冷色调)
======================================================= */
:root {
  /* 基础色彩体系（明澈冷灰白，告别压抑纯黑） */
  --bg-main: #f8fafc;
  --bg-surface: #ffffff;
  --bg-subtle: #f1f5f9;
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;

  /* 文字色彩梯次 */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #94a3b8;

  /* 潮汐主色与渐变强调 */
  --tide-blue: #0284c7;
  --tide-cyan: #06b6d4;
  --tide-glow: rgba(14, 165, 233, 0.08);
  --badge-bg: #e0f2fe;
  --badge-text: #0369a1;

  /* 严控间距（彻底杜绝过宽与塌陷，保持清爽紧凑） */
  --space-2xs: 4px;
  --space-xs: 8px;
  --space-sm: 14px;
  --space-md: 20px;
  --space-lg: 32px;
  --space-section: 56px; /* 统一模块留白 */

  /* 圆角与投影系统 */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06);
  --shadow-hover: 0 10px 22px -4px rgba(15, 23, 42, 0.09);
}

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

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 90%;
  max-width: 1120px;
  margin: 0 auto;
}

/* 顶部粘性导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(248, 250, 252, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

.brand-logo {
  height: 24px;
  width: auto;
}

.brand-accent {
  color: var(--tide-blue);
}

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

.nav-link {
  font-size: 0.92rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: var(--tide-blue);
}

/* 移动端汉堡按钮（默认隐藏，仅小屏显示） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 34px;
  height: 34px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* 移动端下拉导航（默认隐藏，由 JS 切换 .is-open） */
.mobile-nav {
  display: none;
  flex-direction: column;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-surface);
}

.mobile-nav.is-open {
  display: flex;
}

.mobile-nav .nav-link {
  padding: 14px 5%;
  border-bottom: 1px solid var(--border-color);
}

/* Hero 个人风貌区 */
.hero-section {
  padding: 56px 0 44px;
  background: radial-gradient(circle at 85% 10%, rgba(14, 165, 233, 0.08) 0%, transparent 55%);
}

.hero-badge {
  display: inline-flex;
  padding: 4px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--badge-text);
  background-color: var(--badge-bg);
  border-radius: 999px;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.hero-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 14px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--tide-blue) 0%, var(--tide-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin-bottom: 24px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.stat-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
}

.stat-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--tide-cyan);
}

/* 栏目容器收敛与间距控制 */
.content-section {
  padding: var(--space-section) 0;
  border-top: 1px solid var(--border-color);
}

.bg-subtle {
  background-color: var(--bg-subtle);
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 8px;
}

.head-meta {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.head-index {
  font-family: 'Fira Code', monospace;
  font-size: 1rem;
  color: var(--tide-blue);
  font-weight: 600;
}

.section-title {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.section-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* 通用网格排版 */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

/* 卡片基础架构 */
.tide-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
}

.tide-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-hover);
}

.card-top {
  margin-bottom: 16px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 8px;
  gap: 8px;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
}

.status-badge {
  font-size: 0.72rem;
  font-family: 'Fira Code', monospace;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background: #f1f5f9;
  color: var(--text-secondary);
  flex-shrink: 0;
  font-weight: 500;
}

.status-badge.active {
  background: #dcfce7;
  color: #15803d;
}

.status-badge.subtle {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
}

.card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* 标签组 */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.tech-tag {
  font-family: 'Fira Code', monospace;
  font-size: 0.74rem;
  padding: 2px 8px;
  border-radius: 4px;
  background-color: var(--bg-main);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

/* 卡片底栏 */
.card-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.action-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--tide-blue);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.action-link:hover {
  text-decoration: underline;
  opacity: 0.85;
}

.item-meta-text {
  font-size: 0.78rem;
  color: var(--text-tertiary);
}

/* ===== 听觉声浪 · 封面墙 (4.1) =====
   两层反向匀速漂移的专辑封面，退成背景质感而非视觉焦点；
   点击某张封面直接播放，不提供曲目列表/按钮。 */
.cover-wall {
  position: relative;
  overflow: hidden;
  height: 148px;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}

.cover-row {
  display: flex;
  align-items: center;
  gap: 14px;
  width: max-content;
  will-change: transform;
}

.cover-row-a {
  margin-bottom: 14px;
  animation: driftLeft 70s linear infinite;
}

.cover-row-b {
  animation: driftRight 92s linear infinite;
}

.cover-row:hover {
  animation-play-state: paused;
}

@keyframes driftLeft {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

@keyframes driftRight {
  from { transform: translateX(-50%); }
  to { transform: translateX(0); }
}

.cover-thumb {
  flex-shrink: 0;
  width: 62px;
  height: 62px;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: none;
  padding: 0;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

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

.cover-thumb:hover,
.cover-thumb:focus-visible {
  transform: scale(1.12);
  box-shadow: var(--shadow-hover);
  z-index: 2;
}

.cover-thumb.is-playing {
  border-color: var(--tide-blue);
  box-shadow: 0 0 0 2px var(--tide-glow);
}

@media (prefers-reduced-motion: reduce) {
  .cover-row-a, .cover-row-b {
    animation: none;
  }
}

/* ===== 呼出式底部播放器 (4.1) =====
   默认完全隐藏、不占空间；点击封面才会滑出。
   仅提供：上一首 / 播放-暂停 / 下一首 / 循环 / 关闭。 */
.player-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  box-shadow: 0 -8px 24px -8px rgba(15, 23, 42, 0.12);
  transform: translateY(100%);
  transition: transform 0.32s ease;
}

.player-bar.is-open {
  transform: translateY(0);
}

.player-bar-inner {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 0;
}

.player-cover {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--bg-subtle);
}

.player-meta {
  flex: 1;
  min-width: 0;
}

.player-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 6px;
}

.player-progress-track {
  height: 3px;
  border-radius: 2px;
  background: var(--bg-subtle);
  overflow: hidden;
}

.player-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--tide-blue), var(--tide-cyan));
  border-radius: 2px;
}

.player-controls {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.player-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  border: none;
  background: none;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.player-btn svg {
  width: 17px;
  height: 17px;
}

.player-btn:hover {
  background: var(--bg-subtle);
  color: var(--tide-blue);
}

.player-btn-main {
  width: 38px;
  height: 38px;
  background: var(--tide-blue);
  color: #ffffff;
}

.player-btn-main:hover {
  background: var(--tide-blue);
  opacity: 0.88;
  color: #ffffff;
}

.player-btn.is-active {
  color: var(--tide-blue);
  background: var(--tide-glow);
}

@media (max-width: 640px) {
  .player-title { display: none; }
  .player-progress-track { display: none; }
}

/* 占位提示 */
.loading-placeholder {
  grid-column: 1 / -1;
  text-align: center;
  padding: 36px;
  color: var(--text-tertiary);
  font-size: 0.9rem;
}

/* 页脚 */
.site-footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  padding: 32px 0;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-title {
  font-weight: 700;
  font-size: 1rem;
}

.footer-desc {
  font-size: 0.85rem;
  color: var(--text-tertiary);
}

.copyright {
  font-size: 0.82rem;
  color: var(--text-tertiary);
}

/* 内置精致毛玻璃弹窗 (用于未上线作品等交互) */
.tide-modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background-color: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.tide-modal-backdrop.is-open {
  opacity: 1;
  pointer-events: auto;
}

.tide-modal-dialog {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  width: 100%;
  max-width: 440px;
  box-shadow: 0 20px 40px -10px rgba(15, 23, 42, 0.2);
  transform: translateY(12px) scale(0.98);
  transition: transform 0.25s ease;
}

.tide-modal-backdrop.is-open .tide-modal-dialog {
  transform: translateY(0) scale(1);
}

.tide-modal-eyebrow {
  font-family: 'Fira Code', monospace;
  font-size: 0.75rem;
  color: var(--tide-blue);
  letter-spacing: 0.08em;
  font-weight: 600;
  margin-bottom: 8px;
}

.tide-modal-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.tide-modal-message {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 24px;
}

.tide-modal-close-btn {
  width: 100%;
  background-color: var(--text-primary);
  color: #ffffff;
  border: none;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.tide-modal-close-btn:hover {
  background-color: #334155;
}

/* 响应式断点 */
@media (max-width: 768px) {
  :root {
    --space-section: 40px;
  }
  .site-nav {
    display: none;
  }
  .nav-toggle {
    display: flex;
  }
  .cards-grid {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 2rem;
  }
}

@media (min-width: 769px) {
  .mobile-nav {
    display: none !important;
  }
}