/* ============================================================
   responsive.css —— 全站响应式与交互层 v2
   加载顺序：tokens → base → 页面专属 → responsive（最后覆盖）
   断点按 size class 而非设备：≤380 / ≤640 / ≤768 / ≤900 / ≤1024 / >1440
   ============================================================ */

/* ==========================================================
   1. 程序化视觉层（无需外部素材：极光 / 网格 / 微粒噪点）
   ========================================================== */
#aurora {
  position: fixed; inset: 0; z-index: var(--z-aurora);
  pointer-events: none; overflow: hidden;
}
#aurora .blob {
  position: absolute; border-radius: 50%;
  filter: blur(72px); will-change: transform;
  opacity: .75;
}
#aurora .b1 { width: 46vw; height: 46vw; min-width: 360px; min-height: 360px;
  top: -18vw; left: -10vw; background: var(--aurora-1); animation: drift-a 26s var(--ease-spring) infinite alternate; }
#aurora .b2 { width: 40vw; height: 40vw; min-width: 320px; min-height: 320px;
  top: 34vh; right: -14vw; background: var(--aurora-2); animation: drift-b 32s var(--ease-spring) infinite alternate; }
#aurora .b3 { width: 34vw; height: 34vw; min-width: 280px; min-height: 280px;
  bottom: -16vw; left: 22vw; background: var(--aurora-3); animation: drift-c 38s var(--ease-spring) infinite alternate; }
@keyframes drift-a { from { transform: translate3d(0,0,0) scale(1); } to { transform: translate3d(8vw, 6vh, 0) scale(1.15); } }
@keyframes drift-b { from { transform: translate3d(0,0,0) scale(1.1); } to { transform: translate3d(-10vw, -8vh, 0) scale(.92); } }
@keyframes drift-c { from { transform: translate3d(0,0,0) scale(.95); } to { transform: translate3d(6vw, -6vh, 0) scale(1.12); } }

#grid-fx {
  position: fixed; inset: 0; z-index: var(--z-aurora); pointer-events: none;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(80% 70% at 50% 30%, #000 0%, transparent 85%);
  mask-image: radial-gradient(80% 70% at 50% 30%, #000 0%, transparent 85%);
}
#grain {
  position: fixed; inset: 0; z-index: var(--z-aurora); pointer-events: none;
  opacity: .05; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ==========================================================
   1b. 门户首屏程序化光环（纯 CSS，替代待补的视觉素材）
   ========================================================== */
.hero { position: relative; }
.hero-orb {
  position: absolute; right: 6%; top: 50%; transform: translateY(-50%);
  width: min(360px, 28vw); aspect-ratio: 1; border-radius: 50%;
  pointer-events: none; opacity: .85; z-index: 0;
  background:
    radial-gradient(circle at 34% 30%, color-mix(in srgb, var(--mango) 40%, transparent), transparent 58%),
    radial-gradient(circle at 70% 72%, color-mix(in srgb, var(--teal) 30%, transparent), transparent 60%);
  filter: blur(3px);
  animation: orb-float 12s var(--ease-spring) infinite alternate;
}
.hero-orb::before {
  content: ''; position: absolute; inset: 13%; border-radius: 50%;
  border: 1px solid color-mix(in srgb, var(--mango) 48%, transparent);
  box-shadow: 0 0 70px color-mix(in srgb, var(--mango) 20%, transparent),
              inset 0 0 70px color-mix(in srgb, var(--teal) 14%, transparent);
  animation: orb-spin 30s linear infinite;
}
.hero-orb::after {
  content: ''; position: absolute; inset: -7%; border-radius: 50%;
  border: 1px dashed color-mix(in srgb, var(--hairline-strong) 90%, transparent);
  animation: orb-spin 48s linear infinite reverse;
}
@keyframes orb-float { from { transform: translateY(-52%) scale(.98); } to { transform: translateY(-46%) scale(1.03); } }
.hero > .reveal { position: relative; z-index: 1; }
@keyframes orb-spin { to { transform: rotate(360deg); } }
@media (max-width: 900px) { .hero-orb { display: none; } }
@media (prefers-reduced-motion: reduce) { .hero-orb, .hero-orb::before, .hero-orb::after { animation: none !important; } }

/* ==========================================================
   2. 交互反馈组件：滚动进度 / 返回顶部 / 菜单 / 底部标签栏
   ========================================================== */
#scroll-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: calc(var(--z-nav) + 1);
  background: linear-gradient(90deg, var(--teal), var(--mango), var(--sky));
  transform: scaleX(0); transform-origin: 0 50%; pointer-events: none;
  transition: transform .12s linear;
}
#to-top {
  position: fixed; right: 18px; bottom: calc(18px + var(--safe-b));
  width: 46px; height: 46px; border-radius: 50%; z-index: 60;
  display: grid; place-items: center;
  background: var(--bg-glass-strong); color: var(--text-1);
  border: 1px solid var(--hairline); box-shadow: inset 0 1px 0 var(--glass-hi), var(--shadow-2);
  backdrop-filter: blur(var(--lg-blur)) saturate(var(--lg-sat)); -webkit-backdrop-filter: blur(var(--lg-blur)) saturate(var(--lg-sat));
  opacity: 0; transform: translateY(14px) scale(.9); pointer-events: none;
  transition: opacity var(--dur-2) var(--ease-out), transform var(--dur-2) var(--ease-spring);
}
#to-top.show { opacity: 1; transform: none; pointer-events: auto; }
#to-top:hover { border-color: color-mix(in srgb, var(--mango) 50%, transparent); }
#to-top:active { transform: scale(.94); }
#to-top svg { width: 20px; height: 20px; }

.nav-toggle {
  display: none; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: 50%; flex: none;
  margin-left: auto; background: var(--bg-glass-2);
  border: 1px solid var(--hairline); color: var(--text-1);
  transition: transform var(--dur-1) var(--ease-press), background-color var(--dur-1);
}
.nav-toggle:hover { background: var(--hairline-strong); }
.nav-toggle:active { transform: scale(.94); }
.nav-toggle svg { width: 20px; height: 20px; }
.nav-toggle .ico-open { display: block; }
.nav-toggle .ico-close { display: none; }
.nav.menu-open .nav-toggle .ico-open { display: none; }
.nav.menu-open .nav-toggle .ico-close { display: block; }

/* 遮罩必须低于 nav（nav 自身是 stacking context），抽屉才能浮在遮罩之上 */
.nav-backdrop { z-index: calc(var(--z-nav) - 1); }
.forum-backdrop {
  position: fixed; inset: 0; z-index: calc(var(--z-drawer) - 1);
  background: rgba(0,0,0,.45); backdrop-filter: blur(3px);
  opacity: 0; pointer-events: none;
  transition: opacity var(--dur-2) var(--ease-out);
}
.nav-backdrop.show, .forum-backdrop.show { opacity: 1; pointer-events: auto; }

.mobile-tabbar { display: none; }
.mobile-tabbar a {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 3px; min-height: 50px; border-radius: 12px;
  color: var(--text-3); font-size: 11px; font-weight: 600;
  transition: color var(--dur-1) var(--ease-out), transform var(--dur-1) var(--ease-press);
  -webkit-tap-highlight-color: transparent;
}
.mobile-tabbar a:hover { color: var(--text-1); }
.mobile-tabbar a:active { transform: scale(.92); }
.mobile-tabbar a.active { color: var(--mango); }
.mobile-tabbar a svg { width: 21px; height: 21px; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

.forum-drawer-toggle { display: none !important; }

/* 卡片指针视差（仅精细指针设备，JS 设置 --px/--py） */
@media (hover: hover) and (pointer: fine) {
  .parallax { transform: perspective(900px) rotateX(var(--py, 0deg)) rotateY(var(--px, 0deg)); transition: transform .35s var(--ease-spring); }
}

/* ==========================================================
   3. 大屏：更舒展的留白与内容宽度
   ========================================================== */
@media (min-width: 1600px) {
  .container { width: min(1280px, 88vw); }
  .container-wide { width: min(1520px, 90vw); }
  .section { padding: clamp(64px, 7vw, 120px) 0; }
  .grid-cards { gap: var(--sp-6); }
}

/* ==========================================================
   4. ≤1024：论坛收起右栏、门户/博客网格收敛
   ========================================================== */
@media (max-width: 1024px) {
  .forum-layout { grid-template-columns: 240px 1fr; }
  .forum-right { display: none; }
  .now-playing { grid-template-columns: 220px 1fr; gap: 22px; }
  .np-cover { width: 190px; height: 190px; }
}

/* ==========================================================
   5. ≤900：移动导航体系 + 论坛会话抽屉（核心断点）
   ========================================================== */
@media (max-width: 900px) {
  :root { --nav-h: 56px; }
  body { padding-bottom: calc(62px + var(--safe-b)); }

  .nav-toggle { display: inline-flex; }
  .nav .links {
    position: fixed; top: calc(var(--nav-h) + var(--safe-t) + 8px); right: 12px;
    margin: 0; width: min(300px, calc(100vw - 24px));
    max-height: calc(100dvh - var(--nav-h) - 40px); overflow-y: auto;
    flex-direction: column; align-items: stretch; flex-wrap: nowrap; gap: 4px;
    padding: 12px; border-radius: var(--r-lg);
    background: var(--bg-glass-strong); border: 1px solid var(--hairline);
    backdrop-filter: blur(var(--lg-blur)) saturate(var(--lg-sat)); -webkit-backdrop-filter: blur(var(--lg-blur)) saturate(var(--lg-sat));
    box-shadow: inset 0 1px 0 var(--glass-hi), var(--shadow-4);
    z-index: var(--z-drawer);
    opacity: 0; transform: translateY(-12px) scale(.97); pointer-events: none;
    transform-origin: 100% 0;
    transition: opacity var(--dur-2) var(--ease-out), transform var(--dur-2) var(--ease-spring);
  }
  .nav.menu-open .links { opacity: 1; transform: none; pointer-events: auto; }
  .nav .links a.link, .nav .links .btn, .nav .links .theme-btn {
    justify-content: flex-start; width: 100%; min-height: 46px;
    font-size: 16px; border-radius: var(--r-md); padding: 10px 14px;
  }
  .nav .links .theme-btn { width: 46px; }

  .mobile-tabbar {
    position: fixed; left: 0; right: 0; bottom: 0; z-index: var(--z-tabbar);
    display: grid; grid-template-columns: repeat(5, 1fr); gap: 2px;
    padding: 5px 8px calc(5px + var(--safe-b));
    padding-left: calc(8px + var(--safe-l)); padding-right: calc(8px + var(--safe-r));
    background: color-mix(in srgb, var(--bg-1) 84%, transparent);
    backdrop-filter: blur(var(--lg-blur)) saturate(var(--lg-sat)); -webkit-backdrop-filter: blur(var(--lg-blur)) saturate(var(--lg-sat));
    border-top: 1px solid var(--hairline);
    box-shadow: inset 0 1px 0 var(--glass-hi), 0 -8px 30px rgba(0,0,0,.18);
  }

  /* 论坛：会话列表改为可呼出的抽屉，不再直接隐藏 */
  .forum-layout {
    grid-template-columns: 1fr;
    height: calc(100dvh - var(--nav-h) - 62px - var(--safe-b));
    min-height: 420px; padding: 12px 0 0;
  }
  .forum-side {
    display: flex;
    position: fixed; top: calc(var(--nav-h) + var(--safe-t));
    bottom: calc(62px + var(--safe-b)); left: 0;
    width: min(320px, 86vw); z-index: var(--z-drawer);
    border-radius: 0 var(--r-lg) var(--r-lg) 0;
    background: var(--bg-glass-strong);
    transform: translateX(-102%);
    transition: transform var(--dur-2) var(--ease-spring);
    box-shadow: var(--shadow-5);
  }
  .forum-layout.drawer-open .forum-side { transform: none; }
  .forum-drawer-toggle { display: inline-grid !important; place-items: center; width: 40px; height: 40px; flex: none; }
  #to-top { bottom: calc(76px + var(--safe-b)); }
  .mini-bar { bottom: calc(70px + var(--safe-b)); }
}

/* ==========================================================
   6. ≤768：单列阅读、表格横向滚动、播放器堆叠
   ========================================================== */
@media (max-width: 768px) {
  .section { padding: 44px 0 64px; }
  .grid-cards { grid-template-columns: 1fr; gap: var(--sp-4); }

  .hero { min-height: auto; padding-top: 64px; padding-bottom: 28px; }
  .hero .title-xl { font-size: clamp(38px, 9vw, 56px); }
  .hero-sub { font-size: 16px; }

  .blog-toolbar { flex-direction: column; align-items: stretch; gap: 14px; }
  .blog-toolbar > .row { flex-wrap: wrap; }
  .blog-toolbar .input, .blog-toolbar .select { max-width: none !important; flex: 1 1 130px; }
  .cats { overflow-x: auto; flex-wrap: nowrap; padding-bottom: 4px; scrollbar-width: none; }
  .cats::-webkit-scrollbar { display: none; }
  .cat-chip { flex: none; min-height: 40px; display: inline-flex; align-items: center; }

  .tabs { overflow-x: auto; flex-wrap: nowrap; gap: 2px; scrollbar-width: none; margin-top: 24px; }
  .tabs::-webkit-scrollbar { display: none; }
  .tab { flex: none; min-height: 46px; padding: 12px 16px; white-space: nowrap; }

  .now-playing { grid-template-columns: 1fr; text-align: center; gap: 18px; padding: 22px; }
  .np-cover { width: min(200px, 52vw); height: min(200px, 52vw); }
  .np-controls { justify-content: center; flex-wrap: wrap; gap: 10px; }
  .vol-wrap { display: none; }
  .visualizer { height: 68px; }
  .np-progress { gap: 8px; }

  .admin-panel { overflow-x: auto; }
  .tbl { min-width: 620px; }
  .stat-grid { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; }

  .post-view { max-width: 100%; }
  .post-content { font-size: 16px; line-height: 1.85; }
  .comments { max-width: 100%; margin-top: 36px; }
  .editor-pane { max-width: 100%; }
  .editor-pane input.title-in { font-size: 24px; }

  .hero-profile { padding: 24px; }
  #profile-avatar { width: 68px; height: 68px; font-size: 24px; }
  .hero-profile .row.gap-5 { gap: 16px; }

  .modal { padding: var(--sp-5); }
  .modal-overlay { padding: 12px; align-items: flex-end; }
  .modal-overlay.open { align-items: center; }
  #toast-root { bottom: calc(76px + var(--safe-b)); }
}

/* ==========================================================
   7. ≤640：手机主档（20px 全局边距 · 44px 触摸目标）
   ========================================================== */
@media (max-width: 640px) {
  body { font-size: 16px; }
  .container, .container-wide { width: calc(100% - 40px); }
  .section { padding: 36px 0 56px; }

  .nav { padding-left: calc(20px + var(--safe-l)); padding-right: calc(20px + var(--safe-r)); }
  .nav .brand { font-size: 16px; }

  .btn { font-size: 15px; padding: 12px 18px; }
  .btn-sm { min-height: 40px; }
  .icon-btn { width: 44px; height: 44px; }
  .input, .textarea, .select { font-size: 16px; }  /* 防 iOS 聚焦自动缩放 */

  .space-card { padding: 20px; }
  .space-card .ico { width: 46px; height: 46px; font-size: 23px; }
  .space-card h4 { font-size: 18px; }
  .space-card p { min-height: 0; }

  .post-card .cover { height: 180px; }
  .post-card .body { padding: 16px 18px 20px; }
  .post-card h3 { font-size: 18px; }
  .post-card .meta { flex-wrap: wrap; gap: 8px; }

  .song-row { padding: 10px 8px; gap: 10px; }
  .song-row .cover { width: 42px; height: 42px; }
  .song-row .pc { display: none; }
  .song-row .idx { width: 18px; }

  .mini-bar { width: calc(100% - 24px); padding: 8px 12px; gap: 8px; }
  .mini-bar .icon-btn { width: 38px; height: 38px; font-size: 15px; }
  .mini-bar .play-btn.sm { width: 42px; height: 42px; }

  .chat-head { padding: 10px 12px; gap: 8px; }
  .chat-head .badge { font-size: 11px; }
  .messages { padding: 14px; gap: 10px; }
  .msg { max-width: 88%; }
  .msg img { max-width: 180px; }
  .composer { padding: 10px; gap: 6px; }
  .composer textarea { font-size: 16px; min-height: 44px; }
  .composer .icon-btn.sm { width: 40px; height: 40px; }
  .composer .btn.sm { min-height: 40px; padding: 8px 12px; }
  .emoji-pop { left: 8px; right: 8px; width: auto; bottom: 62px; }

  .auth-wrap { padding: 24px 16px; align-items: flex-start; }
  .auth-card { width: 100%; padding: 28px 22px; border-radius: var(--r-lg); }
  .auth-card h1 { font-size: 24px; }

  .footer { padding: 28px 0 calc(24px + var(--safe-b)); }
  .empty { padding: 44px 16px; }
}

/* ==========================================================
   8. ≤380：小屏机型
   ========================================================== */
@media (max-width: 380px) {
  .container, .container-wide { width: calc(100% - 32px); }
  .mobile-tabbar a { font-size: 10px; }
  .mobile-tabbar a svg { width: 19px; height: 19px; }
  .np-controls { gap: 6px; }
  .play-btn { width: 54px; height: 54px; }
  .mini-bar .icon-btn#mini-prev, .mini-bar .icon-btn#mini-next { display: none; }
}

/* ==========================================================
   9. 横屏矮屏：压缩纵向留白
   ========================================================== */
@media (max-height: 560px) and (orientation: landscape) and (max-width: 900px) {
  .hero { min-height: auto; padding-top: 28px; padding-bottom: 20px; }
  .section { padding: 24px 0 40px; }
  .forum-layout { min-height: 320px; }
  .mobile-tabbar a { min-height: 42px; flex-direction: row; gap: 6px; }
  .mobile-tabbar a svg { width: 17px; height: 17px; }
  body { padding-bottom: calc(48px + var(--safe-b)); }
}

/* 卡片指针光晕：只改背景，不触碰 transform，避免与既有 hover 位移冲突 */
.space-card, .post-card, .hidden-card, .pl-card, .stat-card, .admin-card, .space-tile { position: relative; }
.pointer-glow {
  position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  z-index: 0; opacity: 0; mix-blend-mode: screen;
  transition: opacity .35s var(--ease-out);
  background: radial-gradient(240px circle at var(--mx, 50%) var(--my, 50%),
              color-mix(in srgb, var(--mango) 20%, transparent), transparent 62%);
}
.space-card:hover > .pointer-glow, .post-card:hover > .pointer-glow,
.hidden-card:hover > .pointer-glow, .pl-card:hover > .pointer-glow,
.stat-card:hover > .pointer-glow, .admin-card:hover > .pointer-glow,
.space-tile:hover > .pointer-glow { opacity: 1; }

/* 首屏分级入场：只动画 transform / opacity */
@media (prefers-reduced-motion: no-preference) {
  .hero .reveal.in > *, .blog-hero.reveal.in > * { animation: hero-rise .72s var(--ease-spring) both; }
  .hero .reveal.in > *:nth-child(1), .blog-hero.reveal.in > *:nth-child(1) { animation-delay: .04s; }
  .hero .reveal.in > *:nth-child(2), .blog-hero.reveal.in > *:nth-child(2) { animation-delay: .12s; }
  .hero .reveal.in > *:nth-child(3), .blog-hero.reveal.in > *:nth-child(3) { animation-delay: .2s; }
  .hero .reveal.in > *:nth-child(4), .blog-hero.reveal.in > *:nth-child(4) { animation-delay: .28s; }
}
@keyframes hero-rise { from { opacity: 0; transform: translateY(18px); } }

/* ==========================================================
   10. 动效偏好：新层动画全部停用
   ========================================================== */
@media (prefers-reduced-motion: reduce) {
  #aurora .blob { animation: none !important; }
  .parallax { transform: none !important; }
  #scroll-progress { transition: none; }
}