/* [INPUT]: 被 index.html、apps/<slug>/index.html、404.html 共同引用
   [OUTPUT]: 提供 AI 应用门户的设计系统：配色、排版、卡片、按钮、表单
   [POS]: 站点唯一共享样式表；所有页面视觉一致性的来源
   [PROTOCOL]: 变更时更新此头部，然后检查 deploy/macmini/site/ 下各页面 */

:root {
  --bg: #070b16;
  --bg-2: #0c1223;
  --surface: #121a2e;
  --surface-2: #18223b;
  --line: #23304d;
  --line-soft: #1a2438;
  --fg: #e9eefb;
  --fg-dim: #93a0be;
  --fg-mute: #5f6d8c;
  --ok: #35d07f;
  --warn: #ffb43a;
  --err: #ff5c72;
  --accent: #5aa9ff;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 18px 44px rgba(0, 0, 0, .46);
  --ease: cubic-bezier(.22, .61, .36, 1);
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background:
    radial-gradient(1100px 560px at 50% -12%, #1b2542 0%, transparent 60%),
    radial-gradient(900px 500px at 12% 8%, rgba(90, 169, 255, .10), transparent 55%),
    radial-gradient(900px 520px at 88% 0%, rgba(155, 110, 255, .10), transparent 55%),
    linear-gradient(180deg, var(--bg-2), var(--bg) 42%);
  background-color: var(--bg);
  color: var(--fg);
  font: 15px/1.65 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }

/* ---------------- 布局 ---------------- */
.shell { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 22px; }

.topbar {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: saturate(150%) blur(14px);
  -webkit-backdrop-filter: saturate(150%) blur(14px);
  background: rgba(7, 11, 22, .72);
  border-bottom: 1px solid var(--line-soft);
}
.topbar-inner {
  display: flex; align-items: center; gap: 14px;
  height: 62px;
}
.brand { display: flex; align-items: center; gap: 11px; font-weight: 650; letter-spacing: .2px; }
.brand-mark {
  width: 30px; height: 30px; border-radius: 9px; flex: none;
  background: linear-gradient(135deg, #5aa9ff, #9b6eff);
  display: grid; place-items: center;
  box-shadow: 0 6px 18px rgba(90, 169, 255, .34);
}
.brand-mark svg { width: 17px; height: 17px; }
.brand-sub { color: var(--fg-mute); font-weight: 400; font-size: 13px; }
.topbar-spacer { flex: 1; }

.ghost-link {
  color: var(--fg-dim); font-size: 13.5px; padding: 7px 13px;
  border-radius: 9px; border: 1px solid transparent; transition: all .18s var(--ease);
}
.ghost-link:hover { color: var(--fg); background: var(--surface); border-color: var(--line); }

/* ---------------- 首屏 ---------------- */
.hero { padding: 66px 0 30px; text-align: center; }
.hero h1 {
  margin: 0 0 14px; font-size: clamp(30px, 5.2vw, 46px); line-height: 1.16;
  font-weight: 700; letter-spacing: -.8px;
}
.hero h1 .grad {
  background: linear-gradient(100deg, #6fb4ff 0%, #9b6eff 48%, #ff8fc7 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p { margin: 0 auto; max-width: 620px; color: var(--fg-dim); font-size: 15.5px; }

.pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; margin-bottom: 22px;
  border-radius: 999px; font-size: 12.5px; font-weight: 600;
  background: rgba(90, 169, 255, .10);
  border: 1px solid rgba(90, 169, 255, .26);
  color: #9ecbff;
}
.pill .dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }

/* ---------------- 应用网格 ---------------- */
.grid {
  display: grid; gap: 16px; padding: 34px 0 8px;
  grid-template-columns: repeat(auto-fill, minmax(287px, 1fr));
}

.app-card {
  position: relative; display: block; overflow: hidden;
  background: linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 20px 18px;
  transition: transform .22s var(--ease), border-color .22s var(--ease), box-shadow .22s var(--ease);
}
.app-card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--card-accent, var(--accent)), transparent);
  opacity: .55; transition: opacity .22s var(--ease);
}
.app-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--card-accent, var(--accent)) 46%, var(--line));
  box-shadow: var(--shadow);
}
.app-card:hover::before { opacity: 1; }
.app-card:focus-visible { outline: 2px solid var(--card-accent, var(--accent)); outline-offset: 3px; }

.app-head { display: flex; align-items: flex-start; gap: 13px; margin-bottom: 13px; }

.app-icon {
  width: 42px; height: 42px; flex: none; border-radius: 11px;
  display: grid; place-items: center;
  background: color-mix(in srgb, var(--card-accent, var(--accent)) 15%, transparent);
  border: 1px solid color-mix(in srgb, var(--card-accent, var(--accent)) 30%, transparent);
  color: var(--card-accent, var(--accent));
  transition: transform .22s var(--ease);
}
.app-card:hover .app-icon { transform: scale(1.07); }
.app-icon svg { width: 21px; height: 21px; }

/* 标题与副标题必须 display:block —— 二者都是 span，行内布局会挤在同一行
   （表现为「AI 对话Chat」），且 margin-top 对行内元素无效。 */
.app-title { display: block; font-size: 16px; font-weight: 640; letter-spacing: -.1px; line-height: 1.35; }
.app-kicker { display: block; color: var(--fg-mute); font-size: 12px; margin-top: 3px; line-height: 1.2; }

.app-desc { color: var(--fg-dim); font-size: 13.5px; min-height: 42px; margin-bottom: 15px; }

.app-foot {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 13px; border-top: 1px solid var(--line-soft);
}
.tag {
  font-size: 11.5px; color: var(--fg-mute);
  background: var(--surface-2); border: 1px solid var(--line-soft);
  padding: 3px 9px; border-radius: 6px;
}
.open-hint {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 12.5px; font-weight: 600;
  color: var(--card-accent, var(--accent));
  opacity: .82; transition: opacity .2s var(--ease), gap .2s var(--ease);
}
.app-card:hover .open-hint { opacity: 1; gap: 8px; }
.open-hint svg { width: 14px; height: 14px; }

/* ---------------- 应用页 ---------------- */
.app-page { padding: 34px 0 60px; }

.crumb {
  display: inline-flex; align-items: center; gap: 7px;
  color: var(--fg-mute); font-size: 13px; margin-bottom: 20px;
  transition: color .18s var(--ease);
}
.crumb:hover { color: var(--fg-dim); }
.crumb svg { width: 14px; height: 14px; }

.app-hero { display: flex; align-items: center; gap: 15px; margin-bottom: 8px; }
.app-hero .app-icon { width: 52px; height: 52px; border-radius: 14px; }
.app-hero .app-icon svg { width: 26px; height: 26px; }
.app-hero h1 { margin: 0; font-size: 25px; font-weight: 680; letter-spacing: -.4px; }
.app-hero .sub { color: var(--fg-mute); font-size: 13px; margin-top: 3px; }

.panel {
  background: linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin-top: 22px;
}

.notice {
  display: flex; gap: 12px; align-items: flex-start;
  background: rgba(255, 180, 58, .07);
  border: 1px solid rgba(255, 180, 58, .24);
  border-radius: var(--radius-sm);
  padding: 14px 16px; margin-top: 18px;
  font-size: 13.5px; color: #ffd79a;
}
.notice svg { width: 17px; height: 17px; flex: none; margin-top: 2px; }
.notice code {
  background: rgba(0, 0, 0, .32); padding: 1px 6px; border-radius: 5px;
  font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 12.5px;
  color: #ffe6bd;
}
.notice a { color: #ffd79a; text-decoration: underline; text-underline-offset: 2px; }

/* 通用控件 */
.field { display: block; margin-bottom: 14px; }
.field > span { display: block; font-size: 12.5px; color: var(--fg-mute); margin-bottom: 7px; }

textarea, input[type="text"], input[type="search"], select {
  width: 100%; background: #0b1120; color: var(--fg);
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 11px 13px; font: inherit; font-size: 14px;
  transition: border-color .18s var(--ease), box-shadow .18s var(--ease);
}
textarea { min-height: 104px; resize: vertical; line-height: 1.6; }
textarea:focus, input:focus, select:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(90, 169, 255, .16);
}
textarea::placeholder, input::placeholder { color: var(--fg-mute); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: linear-gradient(135deg, #5aa9ff, #7d8dff);
  color: #06101f; font-weight: 650; font-size: 14px;
  border: 0; border-radius: var(--radius-sm);
  padding: 11px 20px; cursor: pointer;
  transition: transform .16s var(--ease), box-shadow .16s var(--ease), opacity .16s var(--ease);
  box-shadow: 0 8px 22px rgba(90, 169, 255, .26);
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 11px 26px rgba(90, 169, 255, .34); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: .45; cursor: not-allowed; transform: none; box-shadow: none; }
.btn svg { width: 16px; height: 16px; }
.btn-ghost {
  background: var(--surface-2); color: var(--fg-dim);
  border: 1px solid var(--line); box-shadow: none;
}
.btn-ghost:hover { color: var(--fg); border-color: var(--fg-mute); box-shadow: none; }

.row { display: flex; gap: 11px; flex-wrap: wrap; align-items: center; }

/* 对话界面 */
.chat-log {
  display: flex; flex-direction: column; gap: 13px;
  min-height: 260px; max-height: 46vh; overflow-y: auto;
  padding: 4px 2px 8px; margin-bottom: 14px;
}
.msg { display: flex; gap: 11px; max-width: 88%; }
.msg .avatar {
  width: 29px; height: 29px; border-radius: 8px; flex: none;
  display: grid; place-items: center; font-size: 12px; font-weight: 700;
}
.msg.bot .avatar { background: rgba(90, 169, 255, .16); color: #9ecbff; border: 1px solid rgba(90, 169, 255, .3); }
.msg.me { align-self: flex-end; flex-direction: row-reverse; }
.msg.me .avatar { background: rgba(53, 208, 127, .14); color: var(--ok); border: 1px solid rgba(53, 208, 127, .3); }
.bubble {
  background: var(--surface-2); border: 1px solid var(--line-soft);
  border-radius: 12px; padding: 10px 14px; font-size: 14px;
}
.msg.me .bubble { background: rgba(90, 169, 255, .12); border-color: rgba(90, 169, 255, .26); }

/* 结果占位区 */
.stage {
  border: 1px dashed var(--line); border-radius: var(--radius-sm);
  min-height: 210px; display: grid; place-items: center;
  color: var(--fg-mute); font-size: 13.5px; text-align: center; padding: 22px;
  background: rgba(0, 0, 0, .16);
}
.stage-grid {
  display: grid; gap: 11px; width: 100%;
  grid-template-columns: repeat(auto-fill, minmax(128px, 1fr));
}
.stage-tile {
  aspect-ratio: 1; border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--surface-2), #101828);
  border: 1px solid var(--line-soft);
  display: grid; place-items: center; color: var(--fg-mute); font-size: 12px;
}

/* 样本数据表 */
.kv { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.kv td { padding: 9px 0; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
.kv tr:last-child td { border-bottom: 0; }
.kv td:first-child { color: var(--fg-mute); width: 132px; white-space: nowrap; }
.mono { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 12.5px; }

.foot {
  margin-top: 46px; padding: 20px 0 30px;
  border-top: 1px solid var(--line-soft);
  color: var(--fg-mute); font-size: 12.5px;
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
}

@media (max-width: 560px) {
  .hero { padding: 42px 0 20px; }
  .grid { grid-template-columns: 1fr; padding-top: 24px; }
  .app-desc { min-height: 0; }
}