/* ═══════════════════════════════════════════════════════════
   手启心言 · 设计系统
   具身手工美学：暖纸底、黛青主色、赭石点缀、圆角有机形态
   ═══════════════════════════════════════════════════════════ */

:root {
  /* 色板 */
  --paper:      #F6F0E3;
  --paper-2:    #FDFBF4;
  --paper-3:    #EFE7D5;
  --ink:        #2D2721;
  --ink-soft:   #6E6152;
  --ink-faint:  #9A8D7B;
  --line:       #E4DAC6;
  --line-soft:  #EEE6D4;

  --teal:       #2E6E67;
  --teal-deep:  #1E4B46;
  --teal-mid:   #3E8A80;
  --teal-soft:  #E1EDE9;
  --teal-ghost: #EFF5F2;

  --terra:      #C05F35;
  --terra-deep: #9E4A26;
  --terra-soft: #F5E2D4;

  --amber:      #D59A3C;
  --amber-soft: #F6ECD3;

  /* 字体 */
  --serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans:  "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  /* 形态 */
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --r-xl: 36px;
  --r-blob: 44px;

  /* 阴影（暖调） */
  --sh-xs: 0 1px 2px rgba(93, 63, 32, .07);
  --sh-sm: 0 2px 10px -2px rgba(93, 63, 32, .12);
  --sh-md: 0 10px 34px -12px rgba(93, 63, 32, .22);
  --sh-lg: 0 24px 60px -20px rgba(93, 63, 32, .28);
  --sh-teal: 0 12px 32px -10px rgba(46, 110, 103, .38);

  --rail-w: 248px;
  --ease-spring: cubic-bezier(.34, 1.4, .44, 1);
  --ease-out: cubic-bezier(.22, .8, .3, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 纸张噪点 */
body::before {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none; z-index: 0;
  opacity: .5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3CfeComponentTransfer%3E%3CfeFuncA type='linear' slope='0.05'/%3E%3C/feComponentTransfer%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

::selection { background: var(--teal); color: #fff; }

a { color: var(--teal); text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
img { max-width: 100%; display: block; }

h1, h2, h3, .serif { font-family: var(--serif); }

/* 滚动条 */
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #D5C8AE; border-radius: 8px; border: 2px solid var(--paper); }
::-webkit-scrollbar-thumb:hover { background: var(--teal-mid); }

/* ─────────────────────────── 左侧轨道栏 ─────────────────────────── */

.rail {
  position: fixed; inset: 0 auto 0 0;
  width: var(--rail-w);
  background: var(--paper-2);
  border-right: 1px solid var(--line);
  display: flex; flex-direction: column;
  z-index: 50;
  overflow-y: auto;
  scrollbar-width: thin;
}

.rail-brand {
  display: flex; align-items: center; gap: 12px;
  padding: 22px 20px 16px;
}
.brand-mark {
  width: 44px; height: 44px; flex: none;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--teal) 0%, var(--teal-deep) 100%);
  color: #FFF7EA;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--sh-teal);
  transform: rotate(4deg);
  transition: transform .45s var(--ease-spring);
}
a:hover > .brand-mark, .rail-brand:hover .brand-mark { transform: rotate(0deg) scale(1.05); }
.brand-mark svg { width: 24px; height: 24px; }
.brand-name { font-family: var(--serif); font-weight: 900; font-size: 20px; letter-spacing: .12em; line-height: 1.2; }
.brand-sub  { font-size: 10.5px; color: var(--ink-faint); letter-spacing: .04em; }

.rail-nav { padding: 6px 12px; display: flex; flex-direction: column; gap: 2px; }
.rail-link {
  display: flex; align-items: center; gap: 11px;
  padding: 10px 12px;
  border-radius: var(--r-md);
  color: var(--ink-soft);
  font-size: 14px;
  transition: all .22s var(--ease-out);
  position: relative;
}
.rail-link svg { width: 17px; height: 17px; flex: none; opacity: .85; }
.rail-link:hover { background: var(--teal-ghost); color: var(--teal-deep); transform: translateX(3px); }
.rail-link.active {
  background: var(--teal);
  color: #FFF7EA;
  font-weight: 600;
  box-shadow: var(--sh-sm);
}
.rail-link.active svg { opacity: 1; }
.rail-badge {
  margin-left: auto;
  font-size: 9.5px; padding: 2px 7px;
  border-radius: 99px;
  background: var(--terra); color: #fff;
  letter-spacing: .05em;
  white-space: nowrap;
}
.rail-link.active .rail-badge { background: rgba(255, 247, 234, .22); }

.rail-foot {
  margin-top: auto;
  padding: 14px 18px;
  border-top: 1px dashed var(--line);
  font-size: 10.5px; color: var(--ink-faint);
  line-height: 1.6;
}
.rail-foot b { color: var(--ink-soft); font-weight: 600; }

/* 主区 */
.main { margin-left: var(--rail-w); position: relative; z-index: 1; min-height: 100vh; }

/* ─────────────────────────── 通用组件 ─────────────────────────── */

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 40px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: none; border-radius: 99px;
  padding: 13px 28px;
  font-size: 15px; font-weight: 600;
  letter-spacing: .04em;
  transition: all .25s var(--ease-out);
  position: relative; overflow: hidden;
}
.btn svg { width: 17px; height: 17px; }
.btn-primary { background: var(--teal); color: #FFF7EA; box-shadow: var(--sh-teal); }
.btn-primary:hover { background: var(--teal-deep); transform: translateY(-2px); box-shadow: 0 16px 40px -10px rgba(46, 110, 103, .5); }
.btn-primary:active { transform: translateY(0) scale(.98); }
.btn-terra { background: var(--terra); color: #FFF7EA; box-shadow: 0 12px 32px -10px rgba(192, 95, 53, .42); }
.btn-terra:hover { background: var(--terra-deep); transform: translateY(-2px); }
.btn-ghost {
  background: transparent; color: var(--teal-deep);
  border: 1.5px solid var(--teal);
}
.btn-ghost:hover { background: var(--teal-soft); transform: translateY(-2px); }
.btn-paper { background: var(--paper-2); color: var(--ink); border: 1px solid var(--line); }
.btn-paper:hover { border-color: var(--teal-mid); color: var(--teal-deep); transform: translateY(-2px); box-shadow: var(--sh-sm); }
.btn-sm { padding: 8px 18px; font-size: 13px; }
.btn[disabled] { opacity: .45; pointer-events: none; }

.chip {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; padding: 4px 13px;
  border-radius: 99px;
  border: 1px solid var(--line);
  background: var(--paper-2);
  color: var(--ink-soft);
}
.chip-teal { background: var(--teal-soft); border-color: transparent; color: var(--teal-deep); }
.chip-terra { background: var(--terra-soft); border-color: transparent; color: var(--terra-deep); }
.chip-amber { background: var(--amber-soft); border-color: transparent; color: #8A6415; }

.card {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-sm);
  transition: transform .3s var(--ease-out), box-shadow .3s var(--ease-out), border-color .3s;
}
.card-hover:hover { transform: translateY(-5px); box-shadow: var(--sh-md); border-color: #D8CBAF; }

.sec { padding: 88px 0; position: relative; }
.sec-head { text-align: center; max-width: 720px; margin: 0 auto 52px; }
.sec-eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 12px; letter-spacing: .35em; color: var(--terra);
  font-weight: 600; margin-bottom: 16px;
}
.sec-eyebrow::before, .sec-eyebrow::after {
  content: ""; width: 26px; height: 1.5px; background: var(--terra); opacity: .5;
}
.sec-title { font-size: 34px; font-weight: 900; letter-spacing: .06em; line-height: 1.35; }
.sec-desc { margin-top: 14px; color: var(--ink-soft); font-size: 15px; }

/* 进入动画 */
.rv { opacity: 0; transform: translateY(28px); transition: opacity .8s var(--ease-out), transform .8s var(--ease-out); }
.rv.in { opacity: 1; transform: none; }
.rv-d1 { transition-delay: .1s; } .rv-d2 { transition-delay: .22s; }
.rv-d3 { transition-delay: .34s; } .rv-d4 { transition-delay: .46s; }

@keyframes floatY {
  0%, 100% { transform: translateY(0) rotate(var(--fr, 0deg)); }
  50% { transform: translateY(-14px) rotate(var(--fr, 0deg)); }
}
.float { animation: floatY 6s ease-in-out infinite; }

@keyframes pulseDot {
  0%, 100% { opacity: .35; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.25); }
}

/* ─────────────────────────── 首页 ─────────────────────────── */

.hero {
  min-height: 100vh;
  display: flex; align-items: center;
  position: relative;
  overflow: hidden;
  padding: 60px 0 80px;
}
.hero-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  pointer-events: none;
}
.hero-blob-1 { width: 480px; height: 480px; background: rgba(62, 138, 128, .18); top: -140px; right: -80px; }
.hero-blob-2 { width: 420px; height: 420px; background: rgba(213, 154, 60, .16); bottom: -120px; left: 6%; }
.hero-blob-3 { width: 300px; height: 300px; background: rgba(192, 95, 53, .12); top: 34%; left: 42%; }

.hero-grid {
  display: grid; grid-template-columns: 1.05fr .95fr;
  gap: 60px; align-items: center;
  position: relative; z-index: 2;
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  background: var(--paper-2); border: 1px solid var(--line);
  padding: 7px 16px; border-radius: 99px;
  font-size: 12.5px; color: var(--ink-soft);
  box-shadow: var(--sh-xs);
  margin-bottom: 26px;
}
.hero-eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--terra); animation: pulseDot 2.2s infinite; }
.hero-title {
  font-size: 58px; font-weight: 900;
  line-height: 1.22; letter-spacing: .04em;
}
.hero-title em {
  font-style: normal;
  color: var(--teal);
  position: relative;
  white-space: nowrap;
}
.hero-title em::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 6px;
  height: 12px; background: var(--amber-soft);
  z-index: -1; border-radius: 4px;
}
.hero-sub {
  margin-top: 22px;
  font-size: 16.5px; color: var(--ink-soft);
  max-width: 520px; line-height: 2;
}
.hero-cta { margin-top: 36px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats { margin-top: 46px; display: flex; gap: 38px; }
.hstat b { font-family: var(--serif); font-size: 30px; font-weight: 900; color: var(--teal-deep); display: block; line-height: 1.1; }
.hstat span { font-size: 12px; color: var(--ink-faint); letter-spacing: .08em; }

/* 首图：圆角大画框（呼应参考 UI 的圆角语言） */
.hero-frame {
  position: relative;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--r-blob);
  padding: 34px;
  box-shadow: var(--sh-lg);
  transform: rotate(1.2deg);
  transition: transform .5s var(--ease-out);
}
.hero-frame:hover { transform: rotate(0deg); }
.hero-frame::before {
  content: ""; position: absolute; inset: 12px;
  border: 1.5px dashed #D9CCAF;
  border-radius: calc(var(--r-blob) - 10px);
  pointer-events: none;
}
.hero-frame-head { display: flex; align-items: center; gap: 10px; margin-bottom: 20px; }
.hero-frame-head .avatar {
  width: 40px; height: 40px; border-radius: 12px;
  background: linear-gradient(135deg, var(--terra), var(--terra-deep));
  display: flex; align-items: center; justify-content: center; color: #FFF7EA;
  box-shadow: var(--sh-sm);
}
.hero-frame-head .avatar svg { width: 21px; height: 21px; }
.hero-frame-head b { font-family: var(--serif); font-size: 16px; letter-spacing: .1em; }
.hero-frame-head span { display: block; font-size: 10.5px; color: var(--ink-faint); }
.hero-frame-msg {
  background: var(--teal-ghost);
  border: 1px solid var(--teal-soft);
  border-radius: 4px 18px 18px 18px;
  padding: 15px 18px;
  font-size: 13.5px; line-height: 1.9; color: var(--ink);
}
.hero-frame-msg b { color: var(--teal-deep); }
.hero-frame-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.hero-frame-chip {
  font-size: 12px; color: var(--teal-deep);
  background: var(--paper-2); border: 1px solid var(--teal-soft);
  padding: 6px 13px; border-radius: 99px;
  transition: all .2s;
}
.hero-frame-chip:hover { background: var(--teal); color: #fff; border-color: var(--teal); transform: translateY(-2px); }
.hero-frame-input {
  margin-top: 18px;
  display: flex; align-items: center; gap: 10px;
  border: 1.5px solid var(--line);
  background: var(--paper);
  border-radius: 99px; padding: 11px 18px;
  color: var(--ink-faint); font-size: 13px;
}
.hero-frame-input svg { width: 16px; height: 16px; }
.hero-frame-input .go {
  margin-left: auto; width: 28px; height: 28px; border-radius: 50%;
  background: var(--teal); color: #fff;
  display: flex; align-items: center; justify-content: center;
}
.hero-frame-input .go svg { width: 14px; height: 14px; }

/* 四阶模式（完整文字版） */
.four-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.four-card {
  background: var(--paper-2); border: 1px solid var(--line);
  border-radius: var(--r-lg); padding: 28px 24px;
  position: relative; overflow: hidden;
  transition: all .35s var(--ease-out);
}
.four-card:hover { transform: translateY(-6px); box-shadow: var(--sh-md); border-color: transparent; }
.four-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--fc, var(--teal));
  transform: scaleX(0); transform-origin: left;
  transition: transform .4s var(--ease-out);
}
.four-card:hover::before { transform: scaleX(1); }
.four-no {
  font-family: var(--serif); font-size: 44px; font-weight: 900;
  color: var(--fc, var(--teal)); opacity: .18; line-height: 1;
}
.four-name { font-family: var(--serif); font-size: 21px; font-weight: 900; letter-spacing: .1em; margin: 8px 0 4px; }
.four-en { font-size: 10.5px; color: var(--ink-faint); letter-spacing: .18em; text-transform: uppercase; }
.four-desc { margin-top: 14px; font-size: 13px; color: var(--ink-soft); line-height: 1.9; }
.four-time {
  margin-top: 16px; display: inline-block;
  font-size: 11px; color: var(--fc, var(--teal));
  background: var(--paper); border: 1px dashed var(--line);
  padding: 3px 11px; border-radius: 99px;
}

/* 智能体时间分配图示（彩条） */
.alloc-bar { margin-top: 14px; border: 1px solid var(--line); border-radius: 14px; background: var(--paper); padding: 13px 15px 11px; }
.alloc-title { font-size: 12px; font-weight: 600; color: var(--ink-soft); margin-bottom: 9px; letter-spacing: .03em; }
.alloc-track { display: flex; height: 26px; border-radius: 8px; overflow: hidden; gap: 2px; }
.alloc-track i { display: block; height: 100%; border-radius: 2px; min-width: 4px; transition: width .8s var(--ease-out); }
.alloc-legend { display: flex; flex-wrap: wrap; gap: 6px 16px; margin-top: 9px; }
.alloc-legend span { display: inline-flex; align-items: center; gap: 6px; font-size: 11.5px; color: var(--ink-soft); }
.alloc-legend i { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }

/* 侧栏美育快讯 */
.rail-news { margin: 4px 14px 12px; border-top: 1px dashed var(--line); padding-top: 10px; }
.rail-news h6 { font-size: 10.5px; letter-spacing: .2em; color: var(--ink-faint); padding: 0 4px 6px; font-weight: 600; display: flex; align-items: center; gap: 6px; }
.rail-news h6 .pulse { width: 6px; height: 6px; border-radius: 50%; background: var(--terra); animation: pulseDot 2.2s infinite; }
.rn-item { display: block; padding: 7px 6px; border-radius: 9px; transition: background .18s; cursor: pointer; }
.rn-item:hover { background: var(--teal-ghost); }
.rn-item b { display: block; font-size: 11.5px; font-weight: 500; color: var(--ink-soft); line-height: 1.55; }
.rn-item span { font-size: 9.5px; color: var(--ink-faint); letter-spacing: .04em; }
.rn-more { font-size: 10px; color: var(--teal); padding: 4px 6px 2px; display: inline-block; }
.rn-note { font-size: 9px; color: var(--ink-faint); padding: 6px 6px 0; line-height: 1.5; }

/* 课前课中课后 全流程 */
.flow { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.flow-card {
  border-radius: var(--r-lg); padding: 32px 28px;
  position: relative; overflow: hidden;
  border: 1px solid var(--line);
  transition: all .35s var(--ease-out);
}
.flow-card:hover { transform: translateY(-6px); box-shadow: var(--sh-md); }
.flow-tag {
  display: inline-block; font-size: 11px; font-weight: 700; letter-spacing: .2em;
  padding: 4px 13px; border-radius: 99px; color: #fff; margin-bottom: 18px;
}
.flow-card h3 { font-size: 20px; font-weight: 900; letter-spacing: .05em; }
.flow-card p { margin-top: 12px; font-size: 13.5px; color: var(--ink-soft); line-height: 1.95; }
.flow-card ul { margin-top: 14px; list-style: none; }
.flow-card li { font-size: 13px; color: var(--ink-soft); padding: 5px 0 5px 20px; position: relative; }
.flow-card li::before { content: ""; position: absolute; left: 2px; top: 13px; width: 7px; height: 7px; border-radius: 2px; background: var(--fc); opacity: .55; }
.flow-arrow { display:flex; align-items:center; justify-content:center; color: var(--ink-faint); }

/* 三维框架 */
.tri-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.tri-card { padding: 30px 28px; border-radius: var(--r-lg); border: 1px solid var(--line); background: var(--paper-2); transition: all .3s var(--ease-out); position: relative; display: flex; flex-direction: column; }
.tri-card:hover { transform: translateY(-5px); box-shadow: var(--sh-md); }
.tri-ico {
  width: 46px; height: 46px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  color: #fff; margin-bottom: 18px;
  box-shadow: var(--sh-sm);
}
.tri-ico svg { width: 23px; height: 23px; }
.tri-card h3 { font-size: 19px; font-weight: 900; letter-spacing: .08em; }
.tri-card .en { font-size: 10.5px; letter-spacing: .16em; color: var(--ink-faint); text-transform: uppercase; }
.tri-card p { margin-top: 12px; font-size: 13.5px; color: var(--ink-soft); flex: 1; }
.tri-items { margin-top: 18px; display: flex; flex-direction: column; gap: 7px; }
.tri-items span { font-size: 12px; color: var(--ink-soft); background: var(--paper); border: 1px solid var(--line-soft); border-radius: 8px; padding: 6px 11px; }

/* 三地 */
.site-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.site-card { padding: 26px; border-radius: var(--r-lg); background: var(--paper-2); border: 1px solid var(--line); position: relative; overflow: hidden; transition: all .3s var(--ease-out); }
.site-card:hover { transform: translateY(-5px); box-shadow: var(--sh-md); }
.site-card::after {
  content: attr(data-code);
  position: absolute; right: -6px; bottom: -22px;
  font-family: var(--serif); font-size: 84px; font-weight: 900;
  color: var(--sc, var(--teal)); opacity: .1; line-height: 1;
}
.site-card h3 { font-size: 18px; font-weight: 900; letter-spacing: .06em; }
.site-card .desc { font-size: 13px; color: var(--ink-soft); margin-top: 8px; }
.site-meta { margin-top: 16px; display: flex; gap: 8px; flex-wrap: wrap; }
.site-card { display: flex; flex-direction: column; }
.site-count { margin-top: auto; padding-top: 14px; border-top: 1px dashed var(--line-soft); display: flex; gap: 20px; }
.site-count span { font-size: 11.5px; color: var(--ink-faint); letter-spacing: .04em; }
.site-count b { font-family: var(--serif); font-size: 17px; color: var(--sc, var(--teal-deep)); margin-right: 4px; }

/* 时间线 */
.timeline { max-width: 760px; margin: 0 auto; position: relative; padding-left: 34px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(var(--teal-mid), var(--line)); border-radius: 2px; }
.tl-item { position: relative; padding-bottom: 30px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-dot {
  position: absolute; left: -34px; top: 5px;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--paper-2); border: 2.5px solid var(--line);
}
.tl-item.done .tl-dot { border-color: var(--teal-mid); background: var(--teal-soft); }
.tl-item.doing .tl-dot { border-color: var(--terra); background: var(--terra-soft); box-shadow: 0 0 0 5px rgba(192, 95, 53, .12); }
.tl-item.doing .tl-dot::after { content: ""; position: absolute; inset: 3.5px; border-radius: 50%; background: var(--terra); animation: pulseDot 1.8s infinite; }
.tl-when { font-size: 12px; color: var(--ink-faint); letter-spacing: .06em; }
.tl-item h4 { font-size: 16.5px; font-weight: 700; margin-top: 2px; }
.tl-item.doing h4 { color: var(--terra-deep); }

/* 团队 */
.team-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.member { text-align: center; padding: 26px 12px; border-radius: var(--r-lg); background: var(--paper-2); border: 1px solid var(--line); transition: all .3s var(--ease-out); }
.member:hover { transform: translateY(-4px); box-shadow: var(--sh-sm); border-color: var(--teal-mid); }
.member .ava {
  width: 58px; height: 58px; margin: 0 auto 12px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-size: 22px; font-weight: 900; color: #fff;
  box-shadow: var(--sh-sm);
}
.member b { font-size: 15.5px; letter-spacing: .08em; }
.member span { display: block; font-size: 11px; color: var(--ink-faint); margin-top: 5px; line-height: 1.6; }

/* CTA 条 */
.cta-band {
  border-radius: var(--r-xl);
  background: linear-gradient(120deg, var(--teal-deep), var(--teal) 55%, var(--teal-mid));
  color: #FFF7EA;
  padding: 64px 56px;
  position: relative; overflow: hidden;
  text-align: center;
  box-shadow: var(--sh-lg);
}
.cta-band::before, .cta-band::after {
  content: ""; position: absolute; border-radius: 50%; border: 1.5px dashed rgba(255, 247, 234, .25);
}
.cta-band::before { width: 300px; height: 300px; top: -140px; left: -90px; }
.cta-band::after { width: 380px; height: 380px; bottom: -220px; right: -130px; }
.cta-band h2 { font-size: 32px; font-weight: 900; letter-spacing: .08em; }
.cta-band p { margin-top: 14px; opacity: .82; font-size: 14.5px; }
.cta-band .btn { margin-top: 30px; background: #FFF7EA; color: var(--teal-deep); }
.cta-band .btn:hover { transform: translateY(-2px); box-shadow: 0 16px 40px -12px rgba(0,0,0,.4); background: #fff; }

/* 页脚 */
.footer {
  border-top: 1px solid var(--line);
  padding: 42px 0 36px;
  margin-top: 40px;
  background: var(--paper-2);
}
.footer-grid { display: flex; justify-content: space-between; gap: 30px; flex-wrap: wrap; align-items: flex-start; }
.footer .brand-line { display: flex; align-items: center; gap: 10px; }
.footer p { font-size: 12px; color: var(--ink-faint); margin-top: 10px; max-width: 420px; line-height: 1.9; }
.footer-links { display: flex; gap: 34px; }
.footer-links h5 { font-size: 12.5px; letter-spacing: .12em; color: var(--ink-soft); margin-bottom: 12px; }
.footer-links a { display: block; font-size: 12.5px; color: var(--ink-faint); padding: 3.5px 0; transition: color .2s; }
.footer-links a:hover { color: var(--teal); }
.footer-bottom { margin-top: 30px; padding-top: 18px; border-top: 1px dashed var(--line); font-size: 11px; color: var(--ink-faint); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

/* ─────────────────────────── 数据页（作品/教案/工具/文献） ─────────────────────────── */

.page-head { padding: 56px 0 30px; }
.page-eyebrow { font-size: 12px; letter-spacing: .3em; color: var(--terra); font-weight: 600; }
.page-title { font-size: 34px; font-weight: 900; letter-spacing: .06em; margin-top: 10px; }
.page-desc { color: var(--ink-soft); margin-top: 10px; max-width: 640px; font-size: 14.5px; }

.filter-bar {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
  padding: 16px 20px;
  background: var(--paper-2); border: 1px solid var(--line);
  border-radius: var(--r-lg); box-shadow: var(--sh-xs);
  margin: 26px 0 30px;
  position: sticky; top: 14px; z-index: 20;
}
.filter-label { font-size: 12px; color: var(--ink-faint); letter-spacing: .1em; margin-right: 2px; }
.fchip {
  font-size: 12.5px; padding: 6px 15px;
  border-radius: 99px; border: 1px solid var(--line);
  background: var(--paper); color: var(--ink-soft);
  transition: all .2s;
}
.fchip:hover { border-color: var(--teal-mid); color: var(--teal-deep); }
.fchip.on { background: var(--teal); border-color: var(--teal); color: #fff; font-weight: 600; box-shadow: var(--sh-sm); }
.filter-count { margin-left: auto; font-size: 12px; color: var(--ink-faint); }

.works-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.work-card { padding: 24px; display: flex; flex-direction: column; }
.work-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; }
.work-id { font-size: 11px; color: var(--ink-faint); letter-spacing: .1em; }
.work-card h3 { font-size: 19px; font-weight: 900; letter-spacing: .05em; margin-top: 6px; }
.work-meta { font-size: 12px; color: var(--ink-soft); margin-top: 5px; }
.work-mat { font-size: 12px; color: var(--ink-faint); margin-top: 3px; }
.work-voice {
  margin-top: 15px; padding: 13px 16px;
  background: var(--amber-soft); border-radius: 4px 14px 14px 14px;
  font-size: 13px; color: #7A5A17; line-height: 1.85;
  font-family: var(--serif);
}
.work-code { margin-top: 16px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.code-cell { text-align: center; }
.code-cell span { font-size: 10.5px; color: var(--ink-faint); display: block; margin-bottom: 5px; }
.code-bar { height: 5px; border-radius: 99px; background: var(--paper-3); overflow: hidden; }
.code-bar i { display: block; height: 100%; border-radius: 99px; background: linear-gradient(90deg, var(--teal-mid), var(--teal)); width: 0; transition: width 1s var(--ease-out); }
.work-tags { margin-top: 14px; display: flex; gap: 6px; flex-wrap: wrap; }
.work-tag { font-size: 10.5px; padding: 2.5px 10px; border-radius: 99px; background: var(--teal-ghost); color: var(--teal-deep); }

.lesson-card { padding: 28px; margin-bottom: 20px; }
.lesson-head { display: flex; gap: 18px; align-items: flex-start; flex-wrap: wrap; }
.lesson-id { font-family: var(--serif); font-weight: 900; font-size: 15px; color: var(--terra); letter-spacing: .06em; background: var(--terra-soft); border-radius: 10px; padding: 8px 12px; }
.lesson-head h3 { font-size: 21px; font-weight: 900; letter-spacing: .04em; }
.lesson-metas { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.lesson-goal { margin-top: 14px; font-size: 14px; color: var(--ink-soft); background: var(--paper); border-left: 3px solid var(--amber); padding: 12px 16px; border-radius: 0 10px 10px 0; }
.lesson-steps { margin-top: 20px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.lstep { background: var(--paper); border: 1px solid var(--line-soft); border-radius: var(--r-md); padding: 15px 14px; position: relative; transition: all .25s; }
.lstep:hover { border-color: var(--teal-mid); transform: translateY(-3px); box-shadow: var(--sh-sm); }
.lstep b { font-family: var(--serif); font-size: 14.5px; color: var(--teal-deep); display: block; letter-spacing: .06em; }
.lstep i { font-style: normal; font-size: 9.5px; color: var(--ink-faint); letter-spacing: .14em; text-transform: uppercase; }
.lstep p { font-size: 12px; color: var(--ink-soft); margin-top: 8px; line-height: 1.8; }
.lesson-tip { margin-top: 16px; font-size: 12.5px; color: var(--terra-deep); background: var(--terra-soft); border-radius: 10px; padding: 10px 15px; }
.lesson-mats { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 7px; }

/* ── 教案库：真实课例 / 其他教案 ── */
.lib-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 28px 0 22px; }
.lib-stat { background: var(--paper-2); border: 1px solid var(--line); border-radius: var(--r-md); padding: 16px 18px; box-shadow: var(--sh-xs); }
.lib-stat b { display: block; font-family: var(--serif); font-size: 26px; line-height: 1.25; color: var(--teal-deep); }
.lib-stat span { font-size: 11.5px; color: var(--ink-faint); letter-spacing: .08em; }

.lib-tabs { display: inline-flex; gap: 4px; padding: 4px; background: var(--paper-3); border-radius: 99px; }
.lib-tab { background: transparent; border: 0; display: flex; align-items: center; gap: 8px; font-size: 13px; padding: 9px 20px; border-radius: 99px; color: var(--ink-soft); transition: all .22s; }
.lib-tab span { font-size: 10.5px; padding: 1px 8px; border-radius: 99px; background: rgba(45, 39, 33, .08); }
.lib-tab:hover { color: var(--teal-deep); }
.lib-tab.on { background: var(--paper-2); color: var(--teal-deep); font-weight: 700; box-shadow: var(--sh-sm); }
.lib-tab.on span { background: var(--teal-soft); color: var(--teal-deep); }

.lib-note { margin: 18px 0 24px; font-size: 12.5px; color: var(--ink-soft); background: var(--amber-soft); border-left: 3px solid var(--amber); padding: 11px 16px; border-radius: 0 10px 10px 0; }
.lesson-filter { margin: 16px 0 22px; }

.lesson-titlewrap { flex: 1; min-width: 220px; }
.lesson-titlewrap h3 { font-size: 20px; font-weight: 900; letter-spacing: .03em; line-height: 1.45; }
.lesson-where { margin-top: 9px; font-size: 12px; color: var(--ink-faint); }
.lesson-goal b { color: var(--ink); margin-right: 10px; letter-spacing: .04em; }

.ratio { margin-top: 18px; }
.ratio-bar { display: flex; gap: 2px; height: 9px; border-radius: 99px; overflow: hidden; background: var(--paper-3); }
.ratio-bar i { display: block; height: 100%; }
.ratio-legend { display: flex; flex-wrap: wrap; gap: 6px 16px; margin-top: 9px; font-size: 11.5px; color: var(--ink-faint); }
.ratio-legend span { display: flex; align-items: center; gap: 6px; }
.ratio-legend i { display: block; width: 7px; height: 7px; border-radius: 99px; }

.lesson-toggle { margin-top: 18px; width: 100%; display: flex; align-items: center; justify-content: center; gap: 8px; font-size: 12.5px; color: var(--teal-deep); background: var(--teal-ghost); border: 1px dashed var(--teal-mid); border-radius: 10px; padding: 10px; transition: all .22s; }
.lesson-toggle em { font-style: normal; font-size: 11px; color: var(--ink-faint); }
.lesson-toggle:hover { background: var(--teal-soft); }
.lesson-toggle.on { border-style: solid; background: var(--teal-soft); }

.lesson-detail { margin-top: 18px; border-top: 1px dashed var(--line); padding-top: 20px; }
.ld-block { margin-bottom: 26px; }
.ld-block h4 { display: flex; align-items: center; gap: 8px; font-family: var(--serif); font-size: 15px; letter-spacing: .08em; color: var(--terra-deep); margin-bottom: 12px; }
.ld-block h4::before { content: ''; width: 14px; height: 2px; border-radius: 2px; background: var(--terra); }

.ld-objs { display: grid; gap: 9px; }
.ld-objs > div { display: grid; grid-template-columns: 88px 1fr; gap: 12px; background: var(--paper); border-radius: 10px; padding: 11px 14px; }
.ld-objs dt { font-size: 11.5px; font-weight: 700; letter-spacing: .04em; color: var(--teal-deep); padding-top: 2px; }
.ld-objs dd { font-size: 13px; color: var(--ink-soft); }

.ld-mats { list-style: none; display: grid; gap: 7px; margin-bottom: 12px; }
.ld-mats li { position: relative; font-size: 12.5px; color: var(--ink-soft); padding-left: 16px; }
.ld-mats li::before { content: ''; position: absolute; left: 2px; top: 9px; width: 5px; height: 5px; border-radius: 99px; background: var(--amber); }

.ld-prep p { font-size: 12.5px; color: var(--ink-soft); margin-top: 8px; }
.ld-prep b, .ld-intent b, .ld-reflect b { display: block; font-size: 11.5px; letter-spacing: .06em; color: var(--teal-deep); margin-bottom: 3px; }
.lesson-goal .ln, .ld-prep .ln { display: block; }

.ld-stage { background: var(--paper-2); border: 1px solid var(--line-soft); border-radius: var(--r-md); padding: 16px 18px; margin-bottom: 12px; }
.ld-stage-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.ld-stage-head b { font-family: var(--serif); font-size: 14.5px; letter-spacing: .05em; color: var(--teal-deep); }
.ld-stage-head span { font-size: 11px; color: var(--ink-faint); }
.ld-desc { margin-top: 6px; font-size: 12px; color: var(--ink-faint); }
.ld-two { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 12px; }
.ld-two h5 { font-size: 11.5px; letter-spacing: .06em; color: var(--terra-deep); margin-bottom: 5px; }
.act { list-style: none; display: grid; gap: 5px; }
.act li { position: relative; font-size: 12.5px; color: var(--ink-soft); padding-left: 14px; }
.act li::before { content: '·'; position: absolute; left: 2px; font-weight: 700; color: var(--teal-mid); }
.ld-intent { margin-top: 12px; background: var(--teal-ghost); border-radius: 10px; padding: 10px 14px; font-size: 12.5px; color: var(--teal-deep); }
.ld-reflect p { font-size: 13px; color: var(--ink-soft); margin-top: 12px; }

.tools-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.tool-card { padding: 26px; }
.tool-head { display: flex; align-items: center; gap: 12px; }
.tool-ico { width: 42px; height: 42px; border-radius: 12px; background: var(--teal-soft); color: var(--teal-deep); display: flex; align-items: center; justify-content: center; flex: none; }
.tool-ico svg { width: 20px; height: 20px; }
.tool-head h3 { font-size: 16.5px; font-weight: 700; line-height: 1.4; }
.tool-status { margin-left: auto; font-size: 11px; padding: 3px 11px; border-radius: 99px; white-space: nowrap; }
.st-doing { background: var(--amber-soft); color: #8A6415; }
.st-done { background: var(--teal-soft); color: var(--teal-deep); }
.st-todo { background: var(--paper-3); color: var(--ink-faint); }
.tool-card > p { margin-top: 13px; font-size: 13.5px; color: var(--ink-soft); }
.tool-items { margin-top: 14px; list-style: none; display: flex; flex-direction: column; gap: 7px; }
.tool-items li { font-size: 12.5px; color: var(--ink-soft); background: var(--paper); border: 1px solid var(--line-soft); padding: 8px 13px; border-radius: 9px; }

.refs-group { margin-bottom: 34px; }
.refs-group h3 { font-size: 17px; font-weight: 900; letter-spacing: .1em; display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.refs-group h3 .n { font-size: 11px; background: var(--teal); color: #fff; border-radius: 99px; padding: 2px 10px; letter-spacing: .05em; }
.ref-item {
  display: flex; gap: 14px; align-items: baseline;
  padding: 13px 18px; margin-bottom: 9px;
  background: var(--paper-2); border: 1px solid var(--line);
  border-radius: var(--r-md); font-size: 13.5px; color: var(--ink-soft);
  transition: all .2s;
}
.ref-item:hover { border-color: var(--teal-mid); transform: translateX(4px); }
.ref-item .no { font-family: var(--serif); font-weight: 700; color: var(--terra); flex: none; font-size: 12.5px; }

.empty-tip { text-align: center; padding: 60px 0; color: var(--ink-faint); font-size: 14px; }

/* ─────────────────────────── 智能体页 ─────────────────────────── */

.agent-body { height: 100vh; overflow: hidden; }

/* 历史列表 */
.rail-history { flex: 1; overflow-y: auto; padding: 4px 12px 10px; min-height: 240px; }
.rail-history h6 { font-size: 10.5px; letter-spacing: .2em; color: var(--ink-faint); padding: 10px 12px 6px; font-weight: 600; display: flex; align-items: center; }
.hist-tools { margin-left: auto; display: flex; gap: 4px; letter-spacing: 0; }
.hist-tools button {
  border: 1px solid var(--line); background: var(--paper); border-radius: 6px;
  font-size: 10px; padding: 1px 7px; color: var(--ink-faint); cursor: pointer;
  transition: all .15s;
}
.hist-tools button:hover { color: var(--teal-deep); border-color: var(--teal-mid); }
.hist-item {
  display: flex; align-items: center; gap: 9px;
  padding: 9px 12px; border-radius: 11px;
  font-size: 13px; color: var(--ink-soft);
  cursor: pointer; transition: all .18s;
  position: relative;
}
.hist-item svg { width: 13px; height: 13px; flex: none; opacity: .55; }
.hist-item span { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.hist-item:hover { background: var(--teal-ghost); color: var(--teal-deep); }
.hist-item.on { background: var(--teal-soft); color: var(--teal-deep); font-weight: 600; }
.hist-item .del {
  opacity: 0; border: none; background: none; color: var(--ink-faint);
  padding: 2px; border-radius: 6px; transition: all .15s;
}
.hist-item:hover .del { opacity: 1; }
.hist-item .del:hover { color: var(--terra); background: var(--terra-soft); }
.hist-item .del svg { width: 12px; height: 12px; }
.hist-empty { font-size: 12px; color: var(--ink-faint); padding: 8px 14px; }

.rail-newchat {
  margin: 10px 14px 4px;
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px; border-radius: 14px;
  background: var(--teal); color: #FFF7EA;
  font-size: 13.5px; font-weight: 600;
  border: none; box-shadow: var(--sh-sm);
  transition: all .22s var(--ease-out);
}
.rail-newchat:hover { background: var(--teal-deep); transform: translateY(-1px); box-shadow: var(--sh-teal); }
.rail-newchat svg { width: 15px; height: 15px; }

/* 对话主区 */
.chat-wrap { margin-left: var(--rail-w); height: 100vh; display: flex; flex-direction: column; position: relative; z-index: 1; }

.chat-topbar {
  height: 60px; flex: none;
  display: flex; align-items: center; gap: 14px;
  padding: 0 26px;
  background: rgba(253, 251, 244, .82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  position: relative; z-index: 10;
}
.chat-topbar .t-ava {
  width: 36px; height: 36px; border-radius: 11px;
  background: linear-gradient(135deg, var(--teal), var(--teal-deep));
  color: #FFF7EA; display: flex; align-items: center; justify-content: center;
  box-shadow: var(--sh-sm); transform: rotate(3deg);
}
.chat-topbar .t-ava svg { width: 19px; height: 19px; }
.chat-topbar .t-name { font-family: var(--serif); font-weight: 900; font-size: 16.5px; letter-spacing: .1em; display: flex; align-items: center; gap: 9px; }
.chat-topbar .t-tag { font-size: 9.5px; font-family: var(--sans); font-weight: 600; letter-spacing: .1em; background: var(--teal-soft); color: var(--teal-deep); padding: 2.5px 9px; border-radius: 99px; }
.chat-topbar .t-sub { font-size: 11px; color: var(--ink-faint); }
.topbar-actions { margin-left: auto; display: flex; gap: 8px; }
.icon-btn {
  width: 36px; height: 36px; border-radius: 11px;
  border: 1px solid var(--line); background: var(--paper-2);
  color: var(--ink-soft);
  display: flex; align-items: center; justify-content: center;
  transition: all .2s;
}
.icon-btn:hover { border-color: var(--teal-mid); color: var(--teal-deep); transform: translateY(-1px); box-shadow: var(--sh-xs); }
.icon-btn svg { width: 16px; height: 16px; }
.status-pill {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 11px; color: var(--ink-faint);
  border: 1px solid var(--line); background: var(--paper-2);
  padding: 5px 12px; border-radius: 99px;
}
.status-pill .dot { width: 7px; height: 7px; border-radius: 50%; background: #4CAF7D; }
.status-pill.off .dot { background: var(--terra); }
.status-pill.off { color: var(--terra-deep); border-color: var(--terra-soft); background: var(--terra-soft); }

/* 欢迎态 */
.chat-scroll { flex: 1; overflow-y: auto; position: relative; }
.welcome {
  min-height: 100%;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 20px 24px 12px;
  position: relative;
}
@media (max-height: 860px) {
  .welcome { justify-content: flex-start; padding-top: 10px; }
  .welcome-logo { width: 58px !important; height: 58px !important; margin-bottom: 12px !important; border-radius: 17px !important; }
  .welcome h1 { font-size: 30px !important; }
  .welcome .w-traits { margin-top: 10px !important; }
  .welcome-card { margin-top: 18px !important; padding: 18px 24px !important; }
  .welcome-card ol { gap: 9px !important; }
  .welcome-card li { font-size: 12.5px !important; line-height: 1.75 !important; }
  .welcome-card .wc-note { margin-top: 10px !important; padding-top: 8px !important; }
  .suggests { margin-top: 14px !important; }
  .welcome-deco { display: none; }
}
.welcome-deco { position: absolute; pointer-events: none; color: var(--teal-mid); opacity: .3; }
.welcome-inner { width: 100%; max-width: 780px; text-align: center; position: relative; z-index: 2; }
.welcome-logo {
  width: 76px; height: 76px; margin: 0 auto 20px;
  border-radius: 22px;
  background: linear-gradient(135deg, var(--terra), var(--terra-deep));
  color: #FFF7EA;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 16px 40px -10px rgba(192, 95, 53, .45);
  transform: rotate(4deg);
  transition: transform .5s var(--ease-spring);
}
.welcome-logo:hover { transform: rotate(0deg) scale(1.06); }
.welcome-logo svg { width: 38px; height: 38px; }
.welcome h1 { font-size: 40px; font-weight: 900; letter-spacing: .18em; }
.welcome .w-sub { color: var(--ink-soft); margin-top: 8px; font-size: 14.5px; letter-spacing: .05em; }
.welcome .w-traits { margin-top: 16px; display: flex; justify-content: center; gap: 9px; flex-wrap: wrap; }

.welcome-card {
  margin: 30px auto 0; max-width: 640px;
  text-align: left;
  background: var(--paper-2); border: 1px solid var(--line);
  border-radius: var(--r-lg); box-shadow: var(--sh-md);
  padding: 24px 28px;
  position: relative;
}
.welcome-card::before {
  content: ""; position: absolute; left: 28px; right: 28px; top: 0; height: 3px;
  background: linear-gradient(90deg, var(--terra), var(--amber), var(--teal));
  border-radius: 0 0 4px 4px;
}
.welcome-card ol { list-style: none; counter-reset: wc; display: flex; flex-direction: column; gap: 13px; }
.welcome-card li { counter-increment: wc; display: flex; gap: 14px; font-size: 13.5px; color: var(--ink-soft); line-height: 1.85; }
.welcome-card li::before {
  content: counter(wc);
  flex: none; width: 24px; height: 24px; margin-top: 2px;
  border-radius: 8px;
  background: var(--teal-soft); color: var(--teal-deep);
  font-size: 12.5px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.welcome-card li b { color: var(--ink); }
.welcome-card .wc-note { margin-top: 16px; padding-top: 13px; border-top: 1px dashed var(--line); font-size: 11.5px; color: var(--ink-faint); }

/* 建议问题 */
.suggests { margin-top: 22px; display: flex; flex-wrap: wrap; justify-content: center; gap: 9px; }
.suggest {
  max-width: 100%;
  font-size: 12.5px; color: var(--ink-soft);
  background: var(--paper-2); border: 1px solid var(--line);
  padding: 8px 16px; border-radius: 99px;
  transition: all .2s var(--ease-out);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.suggest:hover { border-color: var(--terra); color: var(--terra-deep); transform: translateY(-2px); box-shadow: var(--sh-sm); }

/* 输入盒 */
.composer {
  flex: none;
  padding: 8px 24px 16px;
  background: linear-gradient(to top, var(--paper) 65%, transparent);
  position: relative; z-index: 10;
}
.composer-inner { max-width: 780px; margin: 0 auto; }
.composer-box {
  background: var(--paper-2);
  border: 1.5px solid var(--line);
  border-radius: 26px;
  box-shadow: var(--sh-md);
  padding: 14px 16px 10px;
  transition: all .25s var(--ease-out);
}
.composer-box:focus-within {
  border-color: var(--teal-mid);
  box-shadow: 0 14px 44px -12px rgba(46, 110, 103, .3);
}
.composer-modes { display: flex; gap: 7px; flex-wrap: wrap; margin-bottom: 10px; }
.mode-chip {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; padding: 5px 13px;
  border-radius: 99px; border: 1px solid var(--line);
  background: var(--paper); color: var(--ink-soft);
  transition: all .2s;
}
.mode-chip svg { width: 13px; height: 13px; }
.mode-chip:hover { border-color: var(--teal-mid); color: var(--teal-deep); }
.mode-chip.on { background: var(--teal); border-color: var(--teal); color: #fff; font-weight: 600; box-shadow: var(--sh-sm); }
.mode-chip.on.m-plan { background: var(--terra); border-color: var(--terra); }
.mode-chip.on.m-scaffold { background: var(--teal); }
.mode-chip.on.m-iterate { background: var(--amber); border-color: var(--amber); color: #5C430E; }

.composer textarea {
  width: 100%; border: none; outline: none; resize: none;
  background: transparent;
  font-family: var(--sans); font-size: 15px; line-height: 1.75;
  color: var(--ink); min-height: 52px; max-height: 200px;
  padding: 2px 4px;
}
.composer textarea::placeholder { color: var(--ink-faint); }

.attach-previews { display: flex; gap: 9px; flex-wrap: wrap; margin-bottom: 8px; }
.attach-thumb {
  position: relative; width: 62px; height: 62px;
  border-radius: 12px; overflow: hidden;
  border: 1.5px solid var(--line); background: var(--paper-3);
}
.attach-thumb img { width: 100%; height: 100%; object-fit: cover; }
.attach-thumb .rm {
  position: absolute; top: 3px; right: 3px;
  width: 17px; height: 17px; border-radius: 50%;
  background: rgba(45, 39, 33, .68); color: #fff; border: none;
  font-size: 10px; line-height: 1;
  display: flex; align-items: center; justify-content: center;
}
.attach-thumb .ocr-tag {
  position: absolute; bottom: 0; left: 0; right: 0;
  font-size: 8.5px; text-align: center; color: #fff;
  background: rgba(46, 110, 103, .8); padding: 1px 0;
}

.composer-bar { display: flex; align-items: center; gap: 8px; padding: 4px 2px 0; }
.composer-hint { font-size: 11px; color: var(--ink-faint); display: flex; align-items: center; gap: 5px; }
.composer-hint kbd {
  font-family: var(--sans); font-size: 9.5px;
  border: 1px solid var(--line); border-bottom-width: 2px;
  background: var(--paper); border-radius: 5px; padding: 1px 6px;
}
.attach-btn {
  width: 34px; height: 34px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--paper);
  color: var(--ink-soft);
  display: flex; align-items: center; justify-content: center;
  transition: all .2s;
}
.attach-btn:hover { border-color: var(--terra); color: var(--terra); transform: translateY(-1px); }
.attach-btn svg { width: 16px; height: 16px; }
.send-btn {
  margin-left: auto;
  width: 40px; height: 40px; border-radius: 50%;
  border: none;
  background: var(--teal); color: #FFF7EA;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--sh-teal);
  transition: all .22s var(--ease-spring);
}
.send-btn:hover:not([disabled]) { transform: scale(1.08) translateY(-1px); background: var(--teal-deep); }
.send-btn:active:not([disabled]) { transform: scale(.94); }
.send-btn[disabled] { opacity: .35; box-shadow: none; cursor: not-allowed; }
.send-btn svg { width: 17px; height: 17px; }
.composer-tip { text-align: center; font-size: 10.5px; color: var(--ink-faint); margin-top: 9px; letter-spacing: .04em; }

/* 消息流 */
.msgs { max-width: 780px; margin: 0 auto; padding: 26px 24px 20px; display: flex; flex-direction: column; gap: 26px; }
.msg { animation: msgIn .45s var(--ease-out) both; }
@keyframes msgIn { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

.msg-user { display: flex; justify-content: flex-end; }
.msg-user .bubble {
  max-width: 82%;
  background: linear-gradient(135deg, var(--teal), var(--teal-deep));
  color: #F3FAF7;
  border-radius: 20px 20px 6px 20px;
  padding: 12px 18px;
  font-size: 14.5px; line-height: 1.8;
  white-space: pre-wrap; word-break: break-word;
  box-shadow: var(--sh-sm);
}
.msg-user .bubble .imgs { display: flex; gap: 8px; margin-bottom: 8px; flex-wrap: wrap; }
.msg-user .bubble .imgs img { width: 110px; height: 110px; object-fit: cover; border-radius: 12px; border: 2px solid rgba(255,255,255,.35); }

.msg-ai .ai-head { display: flex; align-items: center; gap: 9px; margin-bottom: 9px; }
.msg-ai .ai-ava {
  width: 30px; height: 30px; border-radius: 9px;
  background: linear-gradient(135deg, var(--terra), var(--terra-deep));
  color: #FFF7EA; display: flex; align-items: center; justify-content: center;
  box-shadow: var(--sh-xs);
}
.msg-ai .ai-ava svg { width: 15px; height: 15px; }
.msg-ai .ai-name { font-size: 12.5px; font-weight: 700; color: var(--ink-soft); letter-spacing: .06em; }
.ai-actions { margin-left: auto; display: flex; gap: 3px; opacity: 0; transition: opacity .2s; }
.msg-ai:hover .ai-actions { opacity: 1; }
.ai-act {
  width: 28px; height: 28px; border-radius: 8px; border: none; background: none;
  color: var(--ink-faint); display: flex; align-items: center; justify-content: center;
  transition: all .15s;
}
.ai-act:hover { background: var(--teal-ghost); color: var(--teal-deep); }
.ai-act svg { width: 14px; height: 14px; }

/* 模型状态提示条（自动切换模型 / 未接通时的说明） */
.ai-note {
  display: flex; align-items: flex-start; gap: 8px;
  margin: 0 0 10px; padding: 10px 14px;
  border-radius: 12px; background: rgba(46, 110, 103, .06);
  border: 1px solid rgba(46, 110, 103, .12);
  font-size: 12.5px; line-height: 1.7; color: var(--ink-soft);
}
.ai-note svg { width: 15px; height: 15px; flex: none; margin-top: 2px; color: var(--teal); }
.ai-note b { color: var(--ink); font-weight: 600; margin-right: 5px; }
.ai-note.warn { background: rgba(192, 95, 53, .07); border-color: rgba(192, 95, 53, .16); }
.ai-note.warn svg { color: var(--terra); }

/* 重新生成 */
.ai-foot { display: flex; align-items: center; gap: 10px; margin-top: 11px; }
.ai-re {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--paper-2);
  color: var(--ink-soft); font-size: 12.5px; font-family: inherit; cursor: pointer;
  transition: all .18s;
}
.ai-re:hover { border-color: var(--teal); color: var(--teal-deep); background: var(--teal-ghost); transform: translateY(-1px); }
.ai-re svg { width: 14px; height: 14px; }
.ai-foot-tip { font-size: 11.5px; color: var(--ink-faint); }

.msg-ai .bubble {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 6px 22px 22px 22px;
  padding: 18px 24px;
  box-shadow: var(--sh-sm);
  font-size: 14px; line-height: 1.9;
  color: var(--ink);
}
/* 流式光标 */
.streaming::after {
  content: "▍"; color: var(--terra);
  animation: caretBlink 1s steps(2) infinite;
  font-size: 13px;
}
@keyframes caretBlink { 50% { opacity: 0; } }

.typing { display: inline-flex; gap: 6px; padding: 6px 2px; align-items: center; }
.typing i { width: 8px; height: 8px; border-radius: 50%; background: var(--teal-mid); animation: tp 1.2s infinite; }
.typing i:nth-child(2) { animation-delay: .18s; } .typing i:nth-child(3) { animation-delay: .36s; }
@keyframes tp { 0%, 60%, 100% { transform: translateY(0); opacity: .4; } 30% { transform: translateY(-6px); opacity: 1; } }
.think-hint { font-size: 12px; color: var(--ink-faint); margin-top: 8px; letter-spacing: .03em; }

/* 模型服务选择器 */
.pv-item {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 14px; border: 1.5px solid var(--line); border-radius: 14px;
  margin-bottom: 10px; cursor: pointer; background: var(--paper);
  transition: all .2s;
}
.pv-item:hover { border-color: var(--teal-mid); }
.pv-item.on { border-color: var(--teal); background: var(--teal-ghost); box-shadow: var(--sh-sm); }
.pv-item input { accent-color: var(--teal); width: 16px; height: 16px; flex: none; margin: 0; }
.pv-body { flex: 1; }
.pv-body b { font-size: 14px; display: block; }
.pv-body span { font-size: 11.5px; color: var(--ink-faint); }
.pv-item em { font-style: normal; font-size: 10px; color: var(--teal-deep); background: var(--teal-soft); padding: 2px 9px; border-radius: 99px; white-space: nowrap; }

/* Markdown 排版 */
.md h1, .md h2, .md h3, .md h4 { font-family: var(--serif); color: var(--ink); line-height: 1.5; }
.md h2 { font-size: 18px; font-weight: 900; margin: 20px 0 10px; padding-left: 12px; border-left: 4px solid var(--terra); letter-spacing: .04em; }
.md h2:first-child { margin-top: 2px; }
.md h3 { font-size: 15.5px; font-weight: 700; margin: 15px 0 7px; color: var(--teal-deep); }
.md h4 { font-size: 14px; font-weight: 700; margin: 12px 0 6px; }
.md p { margin: 8px 0; }
.md ul, .md ol { margin: 8px 0 8px 4px; padding-left: 22px; }
.md li { margin: 4px 0; }
.md li::marker { color: var(--terra); }
.md strong { color: var(--terra-deep); font-weight: 700; }
.md blockquote {
  margin: 10px 0; padding: 10px 16px;
  background: var(--amber-soft); border-radius: 4px 12px 12px 12px;
  color: #7A5A17; font-family: var(--serif);
}
.md table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 13px; display: block; overflow-x: auto; }
.md th { background: var(--teal-soft); color: var(--teal-deep); font-weight: 700; text-align: left; }
.md th, .md td { border: 1px solid var(--line); padding: 7px 12px; white-space: nowrap; }
.md td { background: var(--paper-2); }
.md tr:nth-child(even) td { background: var(--paper); }
.md code { background: var(--paper-3); border-radius: 5px; padding: 1.5px 6px; font-size: 12.5px; font-family: Consolas, monospace; color: var(--terra-deep); }
.md hr { border: none; border-top: 1px dashed var(--line); margin: 16px 0; }

/* 弹层 */
.overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(45, 39, 33, .45);
  backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  opacity: 0; pointer-events: none;
  transition: opacity .25s;
}
.overlay.show { opacity: 1; pointer-events: auto; }
.dialog {
  width: 100%; max-width: 560px; max-height: 88vh; overflow-y: auto;
  background: var(--paper-2);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-lg);
  padding: 30px 32px;
  transform: translateY(18px) scale(.97);
  transition: transform .3s var(--ease-spring);
}
.overlay.show .dialog { transform: none; }
.dialog h3 { font-size: 19px; font-weight: 900; letter-spacing: .06em; display: flex; align-items: center; gap: 10px; }
.dialog h3 svg { width: 20px; height: 20px; color: var(--terra); }
.dialog .d-sub { font-size: 12.5px; color: var(--ink-faint); margin-top: 6px; }
.dialog .d-close {
  float: right; width: 32px; height: 32px; border-radius: 9px;
  border: 1px solid var(--line); background: var(--paper); color: var(--ink-soft);
}
.dialog .d-close:hover { color: var(--terra); border-color: var(--terra); }

.field { margin-top: 16px; }
.field label { font-size: 12.5px; font-weight: 600; color: var(--ink-soft); display: block; margin-bottom: 7px; letter-spacing: .04em; }
.field input, .field select, .field textarea {
  width: 100%; border: 1.5px solid var(--line); background: var(--paper);
  border-radius: 12px; padding: 10px 14px;
  font-family: var(--sans); font-size: 14px; color: var(--ink);
  outline: none; transition: border-color .2s, box-shadow .2s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--teal-mid); box-shadow: 0 0 0 3px rgba(62, 138, 128, .14);
}
.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.mat-picks { display: flex; flex-wrap: wrap; gap: 8px; }
.mat-pick {
  font-size: 12.5px; padding: 7px 14px;
  border-radius: 99px; border: 1.5px solid var(--line);
  background: var(--paper); color: var(--ink-soft);
  transition: all .18s;
}
.mat-pick:hover { border-color: var(--teal-mid); color: var(--teal-deep); }
.mat-pick.on { background: var(--teal); border-color: var(--teal); color: #fff; font-weight: 600; }
.dialog .btn { width: 100%; margin-top: 24px; }

/* toast */
.toast {
  position: fixed; bottom: 28px; left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--ink); color: #FFF7EA;
  font-size: 13px; padding: 11px 22px; border-radius: 99px;
  box-shadow: var(--sh-lg); z-index: 300;
  opacity: 0; pointer-events: none;
  transition: all .35s var(--ease-spring);
  display: flex; align-items: center; gap: 8px;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast svg { width: 15px; height: 15px; color: #7FD8A4; }

/* 回到欢迎态时输入盒位置 */
.welcome + .composer, .chat-scroll:has(.welcome) + .composer { }

/* ─────────────────────────── 响应式 ─────────────────────────── */

@media (max-width: 1080px) {
  .four-grid { grid-template-columns: repeat(2, 1fr); }
  .team-grid { grid-template-columns: repeat(3, 1fr); }
  .works-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero-frame { max-width: 560px; }
}
@media (max-width: 860px) {
  :root { --rail-w: 0px; }
  .rail { display: none; }
  .main, .chat-wrap { margin-left: 0; }
  .flow, .tri-grid, .site-grid, .tools-grid { grid-template-columns: 1fr; }
  .wrap { padding: 0 22px; }
  .hero-title { font-size: 40px; }
  .sec { padding: 60px 0; }
  .sec-title { font-size: 26px; }
  .lesson-steps { grid-template-columns: repeat(2, 1fr); }
  .lib-stats { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .ld-two { grid-template-columns: 1fr; gap: 12px; }
  .ld-objs > div { grid-template-columns: 1fr; gap: 2px; }
  .lesson-real { padding: 22px; }
  .mobile-top {
    display: flex !important;
  }
}
.mobile-top {
  display: none;
  position: sticky; top: 0; z-index: 60;
  background: rgba(253, 251, 244, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  padding: 10px 14px;
  align-items: center; gap: 10px;
}
.mobile-top .brand-mark { width: 34px; height: 34px; border-radius: 10px; flex: none; }
.mobile-top .brand-mark svg { width: 18px; height: 18px; }
.mobile-top b { font-family: var(--serif); letter-spacing: .1em; flex: none; }
.mobile-top nav {
  margin-left: auto;
  display: flex; gap: 16px;
  font-size: 13px;
  overflow-x: auto;
  white-space: nowrap;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.mobile-top nav::-webkit-scrollbar { display: none; }
.mobile-top nav a { color: var(--ink-soft); flex: none; }
.mobile-top nav a.active { color: var(--teal); font-weight: 700; }
@media (max-width: 520px) {
  .mobile-top b { display: none; }
}

/* 手机端对话页适配：避让右下角平台悬浮标，压缩留白 */
@media (max-width: 860px) {
  .chat-topbar { padding: 0 14px; gap: 10px; height: 54px; }
  .chat-topbar .t-sub { display: none; }
  .chat-topbar .t-name { font-size: 15px; white-space: nowrap; }
  .status-pill { white-space: nowrap; font-size: 10.5px; padding: 4px 9px; }
  .icon-btn { width: 32px; height: 32px; }
  .msgs { padding: 16px 12px 12px; gap: 20px; }
  .msg-user .bubble { max-width: 94%; }
  .msg-ai .bubble { padding: 14px 16px; font-size: 13.5px; }
  .composer { padding: 6px 10px 44px; }
  .composer-inner { max-width: 100%; }
  .composer-modes { overflow-x: auto; flex-wrap: nowrap; scrollbar-width: none; padding-bottom: 2px; }
  .composer-modes::-webkit-scrollbar { display: none; }
  .mode-chip { flex: none; }
  .composer-hint { display: none; }
  /* 发送键移到左侧，避开右下角平台悬浮标 */
  .send-btn { order: -1; margin-left: 0; margin-right: 6px; flex: none; }
  .welcome-card li { font-size: 12px !important; }
  .chat-scroll { -webkit-overflow-scrolling: touch; }
  .ai-foot { flex-wrap: wrap; gap: 8px; }
  .ai-note { padding: 9px 12px; font-size: 12px; }
}

/* 窄屏对话顶栏：隐去类型标签，保证标题一行放下 */
@media (max-width: 420px) {
  .chat-topbar .t-tag { display: none; }
  .chat-topbar { gap: 8px; }
}