:root{
  --v1:#7C3AED; --v2:#8B5CF6; --v3:#A855F7; --v4:#6D28D9; --v5:#9333EA;
  --ink:#1c1733; --muted:#6b6480; --line:#ece8f7;
  --bg:#f6f5fb; --card:#ffffff;
  --shadow:0 1px 3px rgba(76,29,149,.06),0 10px 30px rgba(76,29,149,.07);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg); color:var(--ink); line-height:1.6; -webkit-font-smoothing:antialiased;
}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
a{color:inherit}

/* HERO */
.hero{position:relative;overflow:hidden;background:linear-gradient(135deg,#4C1D95 0%,#7C3AED 48%,#A855F7 100%);color:#fff;border-bottom:1px solid rgba(255,255,255,.12);padding:42px 0 36px}
.hero-glow{position:absolute;inset:0;background:radial-gradient(900px 320px at 80% -20%,rgba(255,255,255,.28),transparent 60%);pointer-events:none}
.hero-inner{position:relative;z-index:1}
.brand{display:flex;align-items:center;margin-bottom:18px}
.brand-name{font-weight:800;font-size:26px;letter-spacing:.22em;color:#fff;text-shadow:0 2px 10px rgba(0,0,0,.2)}
/* 顶部白色 header：logo.png 是深色字 + 不透明白底，放在白条上才自然，
   紫色 hero 从它下面开始，主色调不受影响。 */
.topbar{background:#fff;border-bottom:1px solid var(--line)}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-top:13px;padding-bottom:13px}
.brand-logo{height:36px;width:auto;display:block}
/* 新闻页 hero 里只剩一个标签，紫色band 收窄一些 */
.hero.hero-slim{padding:22px 0 20px}
/* 首页 hero 已不用，news.html 的页面标签仍依赖它 */
.kicker{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:.1em;color:#ede9fe;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.22);border-radius:999px;padding:5px 13px}
.hero h1{font-size:clamp(28px,5vw,46px);font-weight:800;margin:16px 0 6px;letter-spacing:-.01em}
.hero .sub{color:#e9e3ff;font-size:16px}
.prewarm-note{display:inline-flex;align-items:center;gap:8px;margin-top:12px;font-size:13.5px;color:#ede9fe;background:rgba(255,255,255,.13);border:1px solid rgba(255,255,255,.2);border-radius:999px;padding:6px 14px}
/* 作者样式的 display 会盖掉 hidden 属性依赖的 UA 规则，必须显式写出来 */
.prewarm-note[hidden]{display:none}
.prewarm-note::before{content:"";width:8px;height:8px;border-radius:50%;background:#ede9fe;animation:dp 1.1s infinite ease-in-out}
@keyframes dp{0%,80%,100%{transform:scale(.45);opacity:.45}40%{transform:scale(1);opacity:1}}
.stat-grid{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
.stat{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);border-radius:14px;padding:13px 17px;min-width:118px;backdrop-filter:blur(6px)}
.stat .n{font-size:25px;font-weight:800;line-height:1.1}
.stat .l{font-size:12.5px;color:#e9e3ff;margin-top:2px}
.stat.total .n{color:#fff}
.stat.sec{border-left:4px solid var(--c)}

/* NAV */
nav.anchors{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.86);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--line)}
nav.anchors .wrap{display:flex;flex-wrap:wrap;gap:8px;padding:12px 20px}
nav.anchors a{display:inline-flex;align-items:center;gap:7px;text-decoration:none;color:var(--ink);font-size:14px;font-weight:600;padding:7px 13px;border-radius:999px;border:1px solid var(--line);background:#fff;transition:.15s}
nav.anchors a .pill{font-size:12px;font-weight:700;color:#fff;background:var(--c);border-radius:999px;padding:1px 8px}
nav.anchors a:hover{border-color:var(--c);color:var(--c)}
nav.anchors a.active{border-color:var(--c);color:var(--c);box-shadow:0 0 0 3px color-mix(in srgb,var(--c) 18%,transparent)}

/* SECTIONS */
main{padding:32px 0 8px}
section{padding:16px 0 24px;scroll-margin-top:64px}
.sec-head{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.sec-head .dot{width:12px;height:12px;border-radius:4px;background:var(--c)}
.sec-head h2{font-size:22px;font-weight:800}
.sec-head .cnt{font-size:13px;font-weight:700;color:#fff;background:var(--c);border-radius:999px;padding:3px 11px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(310px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:11px;transition:transform .15s,box-shadow .15s}
.card:hover{transform:translateY(-3px);box-shadow:0 6px 14px rgba(76,29,149,.12),0 18px 40px rgba(76,29,149,.1)}
.card .top{display:flex;align-items:center;justify-content:space-between;gap:10px}
.card .num{font-size:13px;font-weight:800;color:#fff;background:var(--c);border-radius:8px;padding:3px 9px;letter-spacing:.02em}
.card .chip{font-size:12px;font-weight:600;color:var(--c);background:color-mix(in srgb,var(--c) 12%,#fff);border:1px solid color-mix(in srgb,var(--c) 25%,#fff);border-radius:999px;padding:3px 10px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:210px}
.card h3{font-size:16.5px;font-weight:700;line-height:1.4}
.card h3 a{color:var(--ink);text-decoration:none}
.card h3 a:hover{color:var(--c);text-decoration:underline}
.card .sum{font-size:14px;color:#3f3a52;flex:1}
.card .orig{display:inline-flex;align-self:flex-start;align-items:center;gap:5px;font-size:13px;font-weight:600;color:var(--c);text-decoration:none;border:1px solid color-mix(in srgb,var(--c) 30%,#fff);border-radius:9px;padding:6px 11px;transition:.15s}
.card .orig:hover{background:var(--c);color:#fff}

/* FOOTER */
footer{border-top:1px solid var(--line);margin-top:22px;padding:24px 0 110px;color:var(--muted);font-size:13.5px;text-align:center}
footer a{color:var(--v1);text-decoration:none}
#fallback-tag{color:#b45309;font-weight:600}

/* CHAT */
.chat-fab{position:fixed;right:22px;bottom:22px;width:58px;height:58px;border:none;border-radius:18px;cursor:pointer;background:linear-gradient(135deg,#7C3AED,#A855F7);color:#fff;box-shadow:0 8px 24px rgba(124,58,237,.45);z-index:40;display:flex;align-items:center;justify-content:center}
.fab-logo{font-weight:800;font-size:24px;letter-spacing:.02em}
.fab-pulse{position:absolute;inset:0;border-radius:18px;box-shadow:0 0 0 0 rgba(124,58,237,.5);animation:pulse 2.4s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(124,58,237,.45)}70%{box-shadow:0 0 0 16px rgba(124,58,237,0)}100%{box-shadow:0 0 0 0 rgba(124,58,237,0)}}
.chat-panel{position:fixed;right:22px;bottom:22px;width:372px;max-width:calc(100vw - 28px);height:548px;max-height:calc(100vh - 56px);background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:0 20px 60px rgba(76,29,149,.28);z-index:50;display:flex;flex-direction:column;overflow:hidden;transform:translateY(20px) scale(.98);opacity:0;pointer-events:none;transition:.18s}
.chat-panel.open{transform:none;opacity:1;pointer-events:auto}
.chat-head{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;background:linear-gradient(135deg,#6D28D9,#A855F7);color:#fff}
.chat-head-left{display:flex;align-items:center;gap:11px}
.chat-avatar{width:34px;height:34px;border-radius:10px;background:rgba(255,255,255,.2);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px}
.chat-title{font-weight:800;font-size:15px}
.chat-sub{font-size:12px;color:#ece9ff}
.chat-close{border:none;background:rgba(255,255,255,.18);color:#fff;width:30px;height:30px;border-radius:9px;font-size:20px;line-height:1;cursor:pointer}
.chat-close:hover{background:rgba(255,255,255,.3)}
.chat-body{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:12px;background:#faf9fe}
.msg{display:flex}.msg.bot{justify-content:flex-start}.msg.user{justify-content:flex-end}
.bubble{max-width:82%;padding:10px 13px;border-radius:14px;font-size:14px;line-height:1.55;white-space:pre-wrap;word-break:break-word}
.msg.bot .bubble{background:#fff;border:1px solid var(--line);border-bottom-left-radius:4px}
.msg.user .bubble{background:linear-gradient(135deg,#7C3AED,#8B5CF6);color:#fff;border-bottom-right-radius:4px}
/* bot 气泡要纵向堆叠「思考过程 / 气泡 / 来源」，否则 flex 行方向会把它们排成一排 */
.msg.bot{flex-direction:column;align-items:flex-start}
/* 思考过程：默认折叠，流式期间自动展开 */
.msg.bot .think{max-width:82%;margin-bottom:6px;border:1px dashed #ddd6fe;background:#faf8ff;border-radius:12px;overflow:hidden}
.think-head{display:flex;align-items:center;gap:6px;padding:7px 11px;font-size:12px;font-weight:700;color:#7c3aed;cursor:pointer;user-select:none}
.think-head .caret{margin-left:auto;transition:transform .15s}
.think.open .think-head .caret{transform:rotate(90deg)}
.think-body{display:none;padding:0 11px 9px;font-size:12.5px;line-height:1.6;color:#6b7280;white-space:pre-wrap;word-break:break-word;max-height:180px;overflow-y:auto}
.think.open .think-body{display:block}
/* 引用来源 */
.msg.bot .sources{max-width:82%;margin-top:6px;display:flex;flex-direction:column;gap:4px}
.src{display:flex;gap:6px;align-items:baseline;font-size:12px;line-height:1.45}
.src .n{flex:none;font-weight:800;color:#7c3aed}
.src a{color:#4b5563;text-decoration:none;border-bottom:1px solid #e9d5ff}
.src a:hover{color:#7c3aed}
.src .site{color:#9ca3af}
/* 联网搜索开关 */
.chat-tools{display:flex;gap:8px;padding:8px 12px 0;background:#fff}
.chat-toggle{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:#fff;color:#6b7280;font-size:12.5px;font-weight:600;padding:5px 11px;border-radius:999px;cursor:pointer}
.chat-toggle .dot{width:7px;height:7px;border-radius:50%;background:#d1d5db}
.chat-toggle[aria-pressed="true"]{border-color:#c4b5fd;background:#f5f3ff;color:#7c3aed}
.chat-toggle[aria-pressed="true"] .dot{background:#7c3aed;box-shadow:0 0 0 3px rgba(124,58,237,.18)}
.chat-input{display:flex;gap:8px;padding:12px;border-top:1px solid var(--line);background:#fff}
.chat-input textarea{flex:1;resize:none;border:1px solid var(--line);border-radius:12px;padding:9px 11px;font:inherit;font-size:14px;max-height:96px;outline:none}
.chat-input textarea:focus{border-color:var(--v2)}
.chat-input button{border:none;background:linear-gradient(135deg,#7C3AED,#A855F7);color:#fff;font-weight:700;padding:0 16px;border-radius:12px;cursor:pointer}
.chat-input button:disabled{opacity:.55;cursor:not-allowed}
.chat-hint{padding:0 14px 10px;font-size:12px;color:#b45309;min-height:0}
.chat-hint:empty{min-height:0}

@media(max-width:560px){
  .stat-grid{gap:8px}.stat{min-width:calc(50% - 4px)}
  .chat-panel{right:10px;bottom:10px}
  .chat-fab{right:14px;bottom:14px}
}