/* ============================================================
   AI小燕老师 · 燕赵科普游 UI 设计规范（design-system.md）
   品牌主色 #0078D4 · 深海蓝 #003D8F · 亮蓝 #33A3FF
   科技高光 #00D4FF · 学术金 #C9A227 · 橙红 #E85D4E · 柔粉 #FFB6C1
   ============================================================ */
:root{
  --primary:#0078D4;            /* 品牌主色600 */
  --primary-hover:#008CF5;      /* hover */
  --primary-2:#33A3FF;          /* 亮蓝400 */
  --primary-dark:#003D8F;       /* 深海蓝800 */
  --primary-900:#002766;        /* 极深蓝900 */
  --glow:#00D4FF;               /* 科技高光（成功/焦点环） */
  --sky:#4FC3F7;                /* 天空蓝 */
  --ice:#E6F4FF;                /* 冰蓝白50 */
  --ink:#1A1F36; --ink-2:#4B5563; --ink-3:#8C8C8C;
  --bg:#F5F7FA; --card:#FFFFFF; --line:#E5E7EB;
  --ok:#00D4FF; --warn:#C9A227; --danger:#E85D4E;
  --radius:16px;
  --shadow:0 8px 24px rgba(0,120,212,.15);
  --shadow-md:0 2px 8px rgba(0,120,212,.10);
  --glow-ring:0 0 0 3px rgba(0,212,255,.16), 0 0 14px rgba(0,212,255,.30);
  --grad-brand:linear-gradient(135deg,#003D8F,#0078D4 50%,#33A3FF);
  --grad-tech:linear-gradient(135deg,#0078D4,#00D4FF);
  --grad-gold:linear-gradient(180deg,#A68200,#C9A227 50%,#E8D5A3);
  --grad-warm:linear-gradient(135deg,#FFB6C1,#E85D4E);
  --font:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:var(--font);color:var(--ink);background:linear-gradient(160deg,#E6F4FF 0%,#FFFFFF 45%,#F5F7FA 100%);
  display:flex;justify-content:center;overflow:hidden;
}
/* 科技光晕装饰 */
.bg-deco{position:fixed;border-radius:50%;filter:blur(70px);opacity:.5;pointer-events:none;z-index:0}
.bd1{width:420px;height:420px;left:-140px;top:-120px;background:radial-gradient(circle,#66BAFF,transparent 70%)}
.bd2{width:380px;height:380px;right:-120px;bottom:-100px;background:radial-gradient(circle,#99D1FF,transparent 70%)}
.bd3{width:300px;height:300px;left:55%;top:30%;background:radial-gradient(circle,#CCE8FF,transparent 70%)}

.app{
  position:relative;z-index:1;width:100%;max-width:540px;height:100dvh;display:flex;flex-direction:column;
  background:rgba(255,255,255,.78);backdrop-filter:blur(12px);
}
@media(min-width:600px){
  .app{max-width:540px;height:86vh;margin:auto;border-radius:26px;box-shadow:0 24px 70px rgba(0,120,212,.18);border:1px solid #fff;overflow:hidden}
}
/* ---------- 中部：PC 双栏 / 移动单栏 ---------- */
.middle{flex:1;display:flex;flex-direction:column;min-height:0}
.sidebar{display:none}
@media(min-width:900px){
  .app{max-width:1080px}
  .middle{flex-direction:row}
  .sidebar{
    display:flex;flex-direction:column;gap:0;width:330px;flex:none;overflow-y:auto;padding:16px;
    background:rgba(230,244,255,.55);border-right:1px solid var(--line);
  }
  .sidebar .welcome{margin-bottom:0;box-shadow:none;border:1px solid #fff}
  .chat{flex:1;min-width:0;padding:20px 18px 8px}
}

/* ---------- 顶栏（品牌渐变） ---------- */
.topbar{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:12px 16px;background:linear-gradient(120deg,#003D8F,#0078D4 55%,#33A3FF);
  color:#fff;flex:none;box-shadow:0 4px 18px rgba(0,120,212,.35);
}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand-logo{width:42px;height:42px;border-radius:50%;background:#fff;object-fit:cover;box-shadow:0 0 0 2px rgba(255,255,255,.6)}
.brand-name{font-size:17px;font-weight:700;letter-spacing:.5px}
.brand-sub{font-size:11px;opacity:.88;margin-top:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.top-actions{display:flex;align-items:center;gap:8px;flex:none}
.status-badge{
  font-size:11px;padding:4px 9px;border-radius:999px;background:rgba(255,255,255,.18);
  border:1px solid rgba(255,255,255,.4);white-space:nowrap;display:flex;align-items:center;gap:5px;
}
.status-badge::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--warn);box-shadow:0 0 6px rgba(201,162,39,.6)}
.status-badge.on::before{background:var(--glow);box-shadow:0 0 6px rgba(0,212,255,.8)}

/* ---------- 聊天区 ---------- */
.chat{flex:1;min-height:0;overflow-y:auto;scroll-behavior:smooth;padding:16px 14px 8px;scrollbar-width:thin}
.chat::-webkit-scrollbar{width:5px}.chat::-webkit-scrollbar-thumb{background:var(--primary-2);border-radius:99px}

/* 欢迎（背景微光渐变，符合规范） */
.welcome{border-radius:var(--radius);background:linear-gradient(135deg,#E6F4FF,#FFFFFF);border:1px solid #fff;padding:18px 16px;box-shadow:var(--shadow);margin-bottom:16px;opacity:0;transform:translateY(8px);animation:pop .45s ease forwards}
.welcome-head{display:flex;justify-content:space-between;align-items:center;gap:10px}
.welcome-text h1{font-size:20px;margin-bottom:6px;color:var(--primary-dark)}
.welcome-text p{font-size:12.5px;color:var(--ink-2);line-height:1.6}
.welcome-avatar{width:82px;height:82px;object-fit:cover;border-radius:18px;background:#fff;box-shadow:0 6px 16px rgba(0,120,212,.2)}
.welcome-foot{margin-top:12px;display:flex;justify-content:center}
.info-link{
  display:inline-flex;align-items:center;gap:5px;font-size:12.5px;color:var(--primary);
  background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 16px;text-decoration:none;transition:.2s;
}
.info-link:hover{border-color:var(--primary-2);background:var(--ice);box-shadow:0 4px 12px rgba(0,120,212,.15)}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:14px}
/* 临时隐藏的功能卡片（保留在代码中，移除 fc-hidden 类即可恢复） */
.feature-card.fc-hidden{display:none}
.feature-grid:has(.fc-hidden){grid-template-columns:repeat(2,1fr)}
.feature-card{
  display:flex;flex-direction:column;align-items:center;gap:7px;padding:12px 6px;
  background:#fff;border:1px solid var(--line);border-radius:14px;cursor:pointer;transition:.2s;color:var(--ink);font-size:12px;
}
.feature-card:hover{transform:translateY(-3px);box-shadow:0 8px 20px rgba(0,120,212,.15);border-color:var(--primary-2)}
.fc-icon{width:34px;height:34px;border-radius:10px;display:flex;align-items:center;justify-content:center}
.fc-icon svg{width:20px;height:20px;fill:#fff}
/* 功能图标：品牌蓝系为主 + 金/橙红/柔粉点缀（60-30-10 原则） */
.fc-blue{background:linear-gradient(135deg,#003D8F,#0078D4)}
.fc-cyan{background:var(--grad-tech)}
.fc-indigo{background:linear-gradient(135deg,#002766,#33A3FF)}
.fc-green{background:linear-gradient(135deg,#33A3FF,#4FC3F7)}
.fc-orange{background:var(--grad-gold)}
.fc-rose{background:var(--grad-warm)}
.quick-list{display:flex;flex-direction:column;gap:8px;margin-top:14px}
.quick-item{
  display:flex;align-items:center;gap:9px;padding:10px 12px;background:#fff;border:1px solid var(--line);
  border-radius:10px;cursor:pointer;font-size:13px;color:var(--primary);text-align:left;transition:.2s;
}
.quick-item svg{width:16px;height:16px;fill:none;stroke:var(--primary);stroke-width:1.6}
.quick-item:hover{border-color:var(--primary-2);background:var(--ice)}

/* 消息 */
.msg{display:flex;margin:12px 0;animation:pop .3s ease}
.msg.user{justify-content:flex-end}
.msg .bubble{
  max-width:86%;padding:11px 14px;border-radius:16px;font-size:14.5px;line-height:1.7;white-space:pre-wrap;word-break:break-word;
}
.msg.user .bubble{background:linear-gradient(120deg,#0078D4,#33A3FF);color:#fff;border-bottom-right-radius:6px;box-shadow:0 4px 12px rgba(0,120,212,.28)}
.msg.ai .bubble{background:#fff;border:1px solid var(--line);border-bottom-left-radius:6px;box-shadow:var(--shadow-md)}
.msg.ai .avatar{width:34px;height:34px;border-radius:50%;object-fit:cover;margin-right:9px;flex:none;background:#fff;border:1px solid var(--line);margin-top:2px}
.msg.ai .bubble b{color:var(--primary-dark)}
.msg .bubble ol,.msg .bubble ul{margin:6px 0 0 18px}
.msg .bubble li{margin:3px 0}
.typing-cursor{display:inline-block;width:2px;height:1em;background:var(--primary);vertical-align:-2px;animation:blink .8s infinite;margin-left:1px}

/* 思考流水线（科技感浅蓝底 + 发光状态点） */
.think{
  margin:6px 0 2px 43px;background:rgba(0,120,212,.045);border:1px solid rgba(0,120,212,.14);border-radius:12px;overflow:hidden;
}
.think-head{display:flex;align-items:center;justify-content:space-between;padding:9px 12px;cursor:pointer;font-size:12.5px;color:var(--ink-2)}
.think-head .dots{display:inline-flex;gap:3px;margin-left:6px}
.think-head .dots i{width:5px;height:5px;border-radius:50%;background:var(--primary-2);box-shadow:0 0 6px rgba(0,212,255,.6);animation:bounce 1.2s infinite}
.think-head .dots i:nth-child(2){animation-delay:.15s}.think-head .dots i:nth-child(3){animation-delay:.3s}
.think-toggle{color:var(--primary);font-size:12px;user-select:none}
.think-body{display:none;padding:2px 12px 12px}
.think.open .think-body{display:block}
.step{display:flex;gap:8px;padding:5px 0;font-size:12.5px;line-height:1.55}
.step .no{
  flex:none;width:20px;height:20px;margin-top:1px;border-radius:50%;background:var(--ice);color:var(--primary);
  font-size:11px;display:flex;align-items:center;justify-content:center;font-weight:700;
}
.step.done .no{background:var(--ok);color:#002766;box-shadow:0 0 8px rgba(0,212,255,.5)}
.step.run .no{background:var(--warn);color:#fff;animation:pulse 1s infinite}
.step .txt b{color:var(--ink)}
.step .txt .det{color:var(--ink-3);display:block;margin-top:1px}
.step .txt .st{color:var(--ok);font-weight:600}
.step.run .txt .st{color:var(--warn)}

/* 输入栏（聚焦态：科技高光焦点环） */
.composer{display:flex;align-items:flex-end;gap:9px;padding:10px 12px calc(12px + env(safe-area-inset-bottom));background:rgba(255,255,255,.92);border-top:1px solid var(--line);flex:none;backdrop-filter:blur(6px)}
.composer-plus,.composer-send{
  width:40px;height:40px;border:none;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:.2s;flex:none;
}
.composer-plus{background:var(--ice);color:var(--primary)}
.composer-plus:hover{background:#CCE8FF}
.composer-send{background:var(--grad-tech);color:#fff;box-shadow:0 4px 14px rgba(0,120,212,.4)}
.composer-send:hover{transform:scale(1.06);box-shadow:var(--glow-ring)}
.composer-send svg,.composer-plus svg{width:19px;height:19px;fill:currentColor}
.composer-box{flex:1;background:var(--bg);border:1px solid var(--line);border-radius:22px;padding:9px 14px;display:flex;align-items:center;transition:.2s}
.composer-box:focus-within{border-color:var(--primary-2);background:#fff;box-shadow:var(--glow-ring)}
.composer-box textarea{border:none;outline:none;background:transparent;width:100%;resize:none;font-family:var(--font);font-size:14.5px;line-height:1.5;color:var(--ink);max-height:120px}
.composer-box textarea::placeholder{color:var(--ink-3)}

/* 帮助/合规页复用的卡片与表格 */
.kv{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin-bottom:10px}
.kv .k{font-size:12px;color:var(--ink-3);margin-bottom:4px}
.kv .v{font-size:18px;font-weight:700;color:var(--ink)}
.kv .v small{font-size:12px;color:var(--glow);font-weight:600;margin-left:6px}
.table{width:100%;border-collapse:collapse;font-size:12.5px;margin-bottom:14px}
.table th,.table td{text-align:left;padding:7px 8px;border-bottom:1px solid var(--line)}
.table th{color:var(--ink-3);font-weight:600;background:var(--bg)}
.table .ok{color:var(--glow);font-weight:700}
.note{font-size:12px;color:var(--ink-3);line-height:1.7}

.toast{
  position:fixed;left:50%;bottom:96px;transform:translateX(-50%) translateY(10px);background:rgba(0,39,102,.92);color:#fff;
  padding:9px 18px;border-radius:999px;font-size:13px;opacity:0;transition:.25s;z-index:99;pointer-events:none;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

@keyframes pop{to{opacity:1;transform:none}}
@keyframes blink{50%{opacity:0}}
@keyframes bounce{0%,60%,100%{transform:translateY(0)}30%{transform:translateY(-4px)}}
@keyframes pulse{50%{opacity:.4}}