/* ============================================================
   海谊家校通 · 设计系统 v20260916r「靛蓝高定」
   视觉升级要点（版式结构不变）：
   - 主色升级靛蓝渐变 + 极光 hero；大数字渐变描金
   - 卡片 18px 圆角 + 三层阴影 + 发丝描边 + 入场动效
   - 底部导航悬浮玻璃胶囊；顶栏深空渐变 + 双光晕
   - 按钮/胶囊统一内高光 + 按压回弹；深色模式全同步
   ============================================================ */
:root{
  --brand:#3b6cf6;--brand2:#1e46b8;
  --grad:linear-gradient(135deg,#4d7dff 0%,#3b6cf6 45%,#2749c9 100%);
  --bg:#eef2fa;--card:#ffffff;--soft:#f4f7fd;
  --text:#171e2e;--text2:#71809c;
  --line:#e6ecf7;
  --ok:#0a9e6b;--warn:#d97706;--bad:#d64545;
  --gold:#c9a227;
  --r:18px;--rs:12px;
  --sh1:0 1px 2px rgba(20,35,80,.04),0 4px 14px rgba(20,35,80,.07);
  --sh2:0 10px 30px rgba(20,35,80,.18);
  --sat:env(safe-area-inset-top,0px);--sab:env(safe-area-inset-bottom,0px);--appw:480px
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{background:linear-gradient(180deg,#f2f5fc 0%,var(--bg) 30%,#eaeff9 100%);background-attachment:fixed;color:var(--text);font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;font-size:14.5px;max-width:var(--appw);margin:0 auto;min-height:100vh;min-height:100dvh;line-height:1.5}
button{font-family:inherit}

/* —— 顶栏（深空渐变 + 双光晕） —— */
.hd{background:linear-gradient(135deg,#2c50c8 0%,#3b6cf6 55%,#4d7dff 100%);color:#fff;padding:calc(20px + var(--sat)) 16px 18px;position:sticky;top:0;z-index:10;overflow:hidden;box-shadow:0 4px 18px rgba(30,70,184,.28)}
.hd::before{content:"";position:absolute;left:-30px;top:-70px;width:180px;height:180px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.16),transparent 68%);pointer-events:none}
.hd::after{content:"";position:absolute;right:-44px;top:-58px;width:190px;height:190px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.13),transparent 66%);pointer-events:none}
.hd .t{font-size:18.5px;font-weight:800;letter-spacing:.6px}
.hd .s{font-size:12px;opacity:.88;margin-top:3px;letter-spacing:.2px}
.hd .out{position:absolute;right:14px;top:calc(20px + var(--sat));font-size:12px;background:rgba(255,255,255,.16);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);padding:6px 12px;border-radius:15px;cursor:pointer;transition:background .15s;border:1px solid rgba(255,255,255,.14)}
.hd .out:active{background:rgba(255,255,255,.32)}

/* —— 底部导航（悬浮玻璃胶囊） —— */
.tabs{display:flex;background:rgba(255,255,255,.86);backdrop-filter:blur(18px) saturate(1.6);-webkit-backdrop-filter:blur(18px) saturate(1.6);border-top:0;position:fixed;bottom:calc(8px + var(--sab));left:50%;transform:translateX(-50%);width:calc(100% - 20px);max-width:calc(var(--appw) - 20px);z-index:10;overflow-x:auto;scrollbar-width:none;padding:5px;border-radius:20px;box-shadow:0 6px 24px rgba(20,35,80,.14),0 1px 0 rgba(255,255,255,.6) inset;border:1px solid rgba(255,255,255,.5)}
.tabs::-webkit-scrollbar{display:none}
.tabs div{flex:1 0 auto;min-width:52px;text-align:center;padding:6px 2px 7px;font-size:11.5px;color:var(--text2);cursor:pointer;border-radius:15px;margin:1px;transition:color .16s,background .16s,transform .16s}
.tabs div.on{color:var(--brand);font-weight:700;background:rgba(59,108,246,.11)}
.tabs div .i{font-size:19px;display:block;transition:transform .18s cubic-bezier(.3,1.6,.5,1)}
.tabs div.on .i{transform:scale(1.16) translateY(-1px)}

.page{padding:16px 14px calc(96px + var(--sab))}

/* —— 卡片（发丝描边 + 入场动效） —— */
.card{background:var(--card);border-radius:var(--r);padding:16px;margin-bottom:12px;box-shadow:var(--sh1),0 0 0 1px rgba(20,35,80,.028) inset;animation:cardin .4s cubic-bezier(.2,.8,.3,1) both}
@keyframes cardin{from{opacity:0;transform:translateY(10px)}}

/* —— 分组标题（渐变竖条 + 描金点缀） —— */
.label{font-size:13.5px;color:var(--text);margin:18px 2px 9px;font-weight:700;display:flex;align-items:center;gap:7px;letter-spacing:.3px}
.label::before{content:"";width:4px;height:15px;border-radius:2.5px;background:linear-gradient(180deg,#4d7dff,#2749c9);box-shadow:0 2px 6px rgba(59,108,246,.4);flex-shrink:0}
.label .muted{font-weight:500;font-size:12px}

/* —— 按钮体系（内高光 + 回弹） —— */
.btn{display:block;width:100%;background:linear-gradient(135deg,#4d7dff 0%,#3b6cf6 45%,#2749c9 100%);color:#fff;border:0;border-radius:var(--rs);padding:12px;font-size:16px;font-weight:600;cursor:pointer;margin-top:12px;min-height:46px;box-shadow:0 6px 18px rgba(40,80,200,.32),0 1px 0 rgba(255,255,255,.28) inset;transition:transform .13s cubic-bezier(.3,1.4,.5,1),filter .13s;text-shadow:0 1px 1px rgba(20,40,120,.18)}
.btn:active{transform:scale(.975);filter:brightness(.93)}
.btn.ghost{background:rgba(59,108,246,.08);color:var(--brand);box-shadow:none;text-shadow:none;border:1px solid rgba(59,108,246,.22)}
.btn.ghost:active{background:rgba(59,108,246,.17);filter:none}
.btn.sm{width:auto;padding:8px 15px;font-size:13px;border-radius:10px;margin:0;min-height:34px;box-shadow:none}
.btn.sm:active{transform:scale(.94)}
.btn.green{background:linear-gradient(135deg,#1ec98a,#0a9e6b);box-shadow:0 6px 18px rgba(10,158,107,.3),0 1px 0 rgba(255,255,255,.26) inset;text-shadow:0 1px 1px rgba(0,90,60,.2)}
.btn.red{background:linear-gradient(135deg,#f05a56,#d64545);box-shadow:0 6px 18px rgba(214,69,69,.3),0 1px 0 rgba(255,255,255,.26) inset;text-shadow:0 1px 1px rgba(140,30,30,.2)}

/* —— 标签 —— */
.tag{display:inline-block;font-size:12px;padding:2.5px 10px;border-radius:9px;background:rgba(59,108,246,.09);color:var(--brand);margin-left:5px;vertical-align:1px;font-weight:500}
.tag.ok{background:#e2f6ec;color:var(--ok)}.tag.warn{background:#fdf1de;color:var(--warn)}.tag.bad{background:#fdeaea;color:var(--bad)}

/* —— 头像 —— */
.avatar{width:48px;height:48px;border-radius:15px;background:linear-gradient(135deg,#4d7dff,#2749c9);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:700;flex-shrink:0;box-shadow:0 5px 14px rgba(39,73,201,.32),0 1px 0 rgba(255,255,255,.3) inset}

.row{display:flex;align-items:center;gap:12px}
.grow{flex:1;min-width:0}
.muted{color:var(--text2);font-size:12.5px}
.kv{display:flex;justify-content:space-between;font-size:13px;padding:6px 0;border-bottom:1px dashed var(--line);gap:10px}
.kv:last-child{border:0}

/* —— 表格（斑马纹 + 吸顶表头） —— */
table{width:100%;border-collapse:collapse;font-size:12.5px}
th{color:var(--text2);font-weight:600;text-align:left;padding:8px 5px;border-bottom:1px solid var(--line);white-space:nowrap;font-size:11.5px;letter-spacing:.3px}
td{padding:8px 5px;border-bottom:1px solid var(--line)}
tbody tr:nth-child(even){background:var(--soft)}
.tblwrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
.tblwrap.tall{max-height:68vh;max-height:68dvh;overflow:auto;border-radius:12px}
.tblwrap thead th{position:sticky;top:0;background:var(--card);z-index:2;box-shadow:0 1px 0 var(--line)}
.up{color:var(--bad);font-weight:700}.down{color:var(--ok);font-weight:700}
.big{font-size:clamp(26px,7vw,32px);font-weight:800;letter-spacing:.5px;background:linear-gradient(135deg,#4d7dff,#2749c9);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;font-variant-numeric:tabular-nums}

/* —— 数据格 & 宫格 —— */
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.grid4 .c{background:var(--soft);border-radius:13px;padding:10px 6px;text-align:center;box-shadow:0 0 0 1px rgba(20,35,80,.03) inset}
.grid4 .c b{font-size:18px;display:block;font-variant-numeric:tabular-nums}
.grid4 .c span{font-size:11.5px;color:var(--text2)}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}
.grid3 .q{text-align:center;padding:14px 4px;background:var(--card);border-radius:15px;cursor:pointer;box-shadow:var(--sh1),0 0 0 1px rgba(20,35,80,.028) inset;transition:transform .14s cubic-bezier(.3,1.4,.5,1)}
.grid3 .q:active{transform:scale(.95)}
.grid3 .q .ic{font-size:21px;width:40px;height:40px;border-radius:13px;display:flex;align-items:center;justify-content:center;margin:0 auto 6px;background:var(--soft)}
.grid3 .q p{font-size:12px;margin-top:0;color:var(--text);font-weight:500}
.grid3 .q:nth-child(1) .ic{background:#fdf1de}
.grid3 .q:nth-child(2) .ic{background:#e2f6ec}
.grid3 .q:nth-child(3) .ic{background:#e8f0ff}
/* 首页快捷宫格（4 项 · 彩色图标底） */
.quick{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;margin-bottom:12px}
.quick .q{background:var(--card);border-radius:15px;padding:12px 4px 10px;text-align:center;cursor:pointer;box-shadow:var(--sh1),0 0 0 1px rgba(20,35,80,.028) inset;transition:transform .14s cubic-bezier(.3,1.4,.5,1)}
.quick .q:active{transform:scale(.93)}
.quick .q .ic{font-size:21px;width:42px;height:42px;border-radius:14px;display:flex;align-items:center;justify-content:center;margin:0 auto 6px}
.quick .q p{font-size:12px;margin-top:0;color:var(--text);font-weight:500}
.quick .q:nth-child(1) .ic{background:#e8f0ff}
.quick .q:nth-child(2) .ic{background:#e2f6ec}
.quick .q:nth-child(3) .ic{background:#f3ecff}
.quick .q:nth-child(4) .ic{background:#fdf1de}

/* —— 弹层 —— */
.sheet{position:fixed;inset:0;background:rgba(12,22,48,.52);z-index:50;display:flex;align-items:flex-end;justify-content:center;animation:sfade .2s;backdrop-filter:blur(3px);-webkit-backdrop-filter:blur(3px)}
.sheet .box{background:var(--card);width:100%;max-width:var(--appw);border-radius:22px 22px 0 0;padding:14px 16px calc(26px + var(--sab));max-height:88vh;max-height:88dvh;overflow:auto;animation:sup .3s cubic-bezier(.2,.9,.3,1);box-shadow:0 -8px 32px rgba(12,22,48,.22)}
.sheet .box::before{content:"";display:block;width:38px;height:4.5px;border-radius:3px;background:linear-gradient(90deg,#d5deef,#c3cfe8);margin:0 auto 12px}
.sheet h3{font-size:16.5px;margin-bottom:12px;font-weight:700}
@keyframes sfade{from{opacity:0}}
@keyframes sup{from{transform:translateY(45%)}}

/* —— 表单 —— */
.fi{margin:11px 0}.fi label{font-size:12.5px;color:var(--text2);display:block;margin-bottom:5px;font-weight:500}
.fi input,.fi select,.fi textarea{width:100%;border:1.5px solid var(--line);border-radius:12px;padding:11px 12px;font-size:16px;font-family:inherit;background:var(--soft);color:var(--text);transition:border-color .16s,box-shadow .16s,background .16s}
.fi input:focus,.fi select:focus,.fi textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3.5px rgba(59,108,246,.13);background:var(--card)}
.fi textarea{height:74px;resize:none}
.fi input::placeholder,.fi textarea::placeholder{color:#aeb9cf}

/* —— Toast（语义色 + 入场动画） —— */
.toast{position:fixed;top:calc(12% + var(--sat));left:50%;transform:translateX(-50%);background:rgba(22,30,50,.92);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);color:#fff;padding:11px 20px;border-radius:15px;font-size:13.5px;z-index:99;max-width:80%;text-align:center;box-shadow:var(--sh2);animation:tin .22s ease}
.toast.ok{background:rgba(10,158,107,.94)}
.toast.bad{background:rgba(214,69,69,.94)}
@keyframes tin{from{opacity:0;transform:translate(-50%,-10px)}}

/* —— 列表项 —— */
.item{padding:11px 0;border-bottom:1px dashed var(--line)}
.item:last-child{border:0}
.item h4{font-size:14.5px;font-weight:600}
.item p{font-size:12.5px;color:var(--text2);margin-top:3px;line-height:1.55}

/* —— 消息 —— */
.bubble{max-width:78%;padding:10px 13px;border-radius:16px;font-size:14px;margin:5px 0;line-height:1.5}
.bubble.me{background:linear-gradient(135deg,#4d7dff,#2749c9);color:#fff;margin-left:auto;border-bottom-right-radius:5px;box-shadow:0 3px 10px rgba(39,73,201,.24)}
.bubble.you{background:var(--card);border:1px solid var(--line);border-bottom-left-radius:5px;box-shadow:var(--sh1)}
.msgrow{display:flex}.msgrow.me{justify-content:flex-end}
.chatbox{position:fixed;bottom:calc(80px + var(--sab));left:50%;transform:translateX(-50%);width:calc(100% - 20px);max-width:calc(var(--appw) - 20px);background:rgba(255,255,255,.9);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);display:flex;padding:9px 12px;border-top:0;border-radius:18px;box-shadow:0 6px 24px rgba(20,35,80,.14),0 1px 0 rgba(255,255,255,.6) inset;border:1px solid rgba(255,255,255,.5)}
.chatbox input{flex:1;border:1.5px solid var(--line);border-radius:21px;padding:10px 14px;font-size:16px;outline:none;transition:border-color .15s;background:var(--card);color:var(--text)}
.chatbox input:focus{border-color:var(--brand)}
.chatbox button{border:0;background:linear-gradient(135deg,#4d7dff,#2749c9);color:#fff;border-radius:21px;padding:0 17px;margin-left:8px;font-size:14px;font-weight:600;min-height:40px;box-shadow:0 3px 10px rgba(39,73,201,.26)}

/* —— 考试切换胶囊 —— */
.examtabs{display:flex;gap:7px;overflow-x:auto;padding-bottom:4px;margin-bottom:10px;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.examtabs::-webkit-scrollbar{display:none}
.examtabs button{flex-shrink:0;border:0;background:var(--soft);border-radius:17px;padding:8px 15px;font-size:12.5px;color:var(--text2);cursor:pointer;transition:all .16s;min-height:36px;font-weight:500}
.examtabs button.on{background:linear-gradient(135deg,#4d7dff,#2749c9);color:#fff;font-weight:600;box-shadow:0 4px 12px rgba(40,80,200,.3),0 1px 0 rgba(255,255,255,.24) inset}

/* —— 进度条 —— */
.bar{height:6px;background:var(--soft);border-radius:3px;overflow:hidden;margin-top:4px}
.bar i{display:block;height:100%;background:linear-gradient(90deg,#4d7dff,#2749c9);border-radius:3px;box-shadow:0 0 8px rgba(59,108,246,.4)}

input[type=file]{font-size:12.5px}
.chk{display:flex;align-items:center;gap:7px;font-size:12.5px;color:var(--text2);margin-top:8px}

/* —— 班级选择器（横向 chip + 可搜索，班级规模化后依然清晰） —— */
.clsbar{display:flex;flex-direction:column;gap:8px}
.clssearch{width:100%;border:1px solid var(--line);background:var(--soft);border-radius:11px;padding:9px 12px;font-size:13px;color:var(--text);outline:none;transition:border-color .15s,background .15s}
.clssearch:focus{border-color:var(--brand);background:var(--card)}
.clsrow{display:flex;flex-wrap:wrap;gap:7px}
.clschip{display:inline-flex;align-items:center;gap:5px;padding:7px 13px;border-radius:15px;background:var(--soft);color:var(--text2);font-size:12.5px;font-weight:500;cursor:pointer;transition:all .14s;min-height:34px;user-select:none;white-space:nowrap}
.clschip b{font-variant-numeric:tabular-nums}
.clschip:active{transform:scale(.95)}
.clschip.on{background:linear-gradient(135deg,#4d7dff,#2749c9);color:#fff;font-weight:600;box-shadow:0 4px 12px rgba(40,80,200,.3),0 1px 0 rgba(255,255,255,.24) inset}

/* —— 学生搜索命中列表（替代 300+ 条超长下拉框） —— */
.hits{margin-top:6px;max-height:280px;overflow-y:auto;-webkit-overflow-scrolling:touch}
.hits .hit{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:11px 12px;border-radius:11px;background:var(--soft);margin-bottom:5px;cursor:pointer;transition:background .14s}
.hits .hit:active{background:rgba(59,108,246,.12)}
.hits .hit b{font-size:13.5px;color:var(--text)}
.hits .hit .muted{font-size:11.5px;text-align:right}

/* —— 成绩表工具条 + 次要科目默认收起（手机上免横向滚动） —— */
.tblbar{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:9px;flex-wrap:wrap}
#scoreTab .sub-more{display:none}
#scoreTab.full .sub-more{display:table-cell}

/* —— 回到顶部 —— */
.btop{position:fixed;right:14px;bottom:calc(92px + var(--sab));width:42px;height:42px;border-radius:50%;background:rgba(23,30,46,.72);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);color:#fff;display:none;align-items:center;justify-content:center;font-size:18px;z-index:40;cursor:pointer;box-shadow:0 4px 14px rgba(0,0,0,.24);border:1px solid rgba(255,255,255,.14)}
.btop.show{display:flex}

/* —— 加载态 / 空状态 / 折叠说明 —— */
.spin{display:inline-block;width:22px;height:22px;border:3px solid rgba(59,108,246,.16);border-top-color:var(--brand);border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.empty{text-align:center;padding:30px 16px;color:var(--text2);font-size:13px}
details.hint{background:var(--soft);border-radius:12px;padding:10px 13px;margin:9px 0;font-size:12.5px;color:var(--text2);line-height:1.65}
details.hint summary{cursor:pointer;font-weight:600;color:var(--brand);font-size:12.5px}
details.hint summary::-webkit-details-marker{display:none}
details.hint p{margin-top:8px}

/* —— 登录页品牌区 —— */
.login-hero{text-align:center;padding:26px 0 8px}
.login-logo{width:68px;height:68px;border-radius:21px;background:linear-gradient(135deg,#4d7dff 0%,#3b6cf6 50%,#2749c9 100%);display:flex;align-items:center;justify-content:center;font-size:33px;margin:0 auto 12px;box-shadow:0 12px 30px rgba(30,70,184,.36),0 1px 0 rgba(255,255,255,.3) inset}
.login-hero h2{font-size:19.5px;font-weight:800;letter-spacing:.8px}
.login-hero p{font-size:12.5px;color:var(--text2);margin-top:5px}

/* —— 极光学生卡（家长首页） —— */
.hero{background:linear-gradient(135deg,#2c50c8 0%,#3b6cf6 48%,#4d7dff 78%,#6d8dff 100%);border-radius:var(--r);padding:18px 16px;margin-bottom:12px;color:#fff;box-shadow:0 10px 28px rgba(30,70,184,.34),0 1px 0 rgba(255,255,255,.22) inset;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;right:-34px;top:-50px;width:160px;height:160px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.2),transparent 66%);pointer-events:none}
.hero::after{content:"";position:absolute;right:34px;bottom:-56px;width:120px;height:120px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.13),transparent 64%);pointer-events:none}
.hero .avatar{background:rgba(255,255,255,.24);box-shadow:0 2px 10px rgba(0,0,0,.16)}
.hero .tag{background:rgba(255,255,255,.24);color:#fff}
.hero .tag.ok{background:rgba(255,255,255,.24);color:#fff}
.hero .tag.warn{background:rgba(255,214,120,.32);color:#ffe9b8}
.hero .muted{color:rgba(255,255,255,.82)}
.hero .big{background:linear-gradient(180deg,#ffffff,#cfe0ff);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}

/* —— 考勤登记 —— */
.attrow{padding:10px 0;border-bottom:1px dashed var(--line)}
.attrow:last-child{border-bottom:0}
.attname{display:flex;align-items:center;flex-wrap:wrap;gap:4px;margin-bottom:6px}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{font-size:12px;padding:5px 12px;border-radius:15px;background:var(--soft);color:var(--text2);cursor:pointer;border:1px solid transparent;user-select:none;transition:transform .12s,background .15s}
.chip.on{background:linear-gradient(135deg,#4d7dff,#2749c9);color:#fff;font-weight:600;box-shadow:0 2px 8px rgba(40,80,200,.28)}
.chip:active{transform:scale(.93)}
/* —— 课表 —— */
table.tt td{text-align:center;padding:4px 2px}
.ttc{width:100%;min-width:54px;border:1.5px solid var(--line);border-radius:8px;padding:6px 2px;font-size:12.5px;text-align:center;background:var(--card);color:var(--text)}
.ttc:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(59,108,246,.13)}
.ttv{font-size:12.5px;min-height:18px}
table.tt.sm th,table.tt.sm td{padding:4px 3px;font-size:11.5px}
.clschip{cursor:pointer;background:var(--soft);border-radius:15px;padding:5px 12px;font-size:12.5px}

/* —— 平板 / 大屏自适应 —— */
@media (min-width:560px){
  :root{--appw:640px}
  body{font-size:15px}
  .card{padding:18px 20px}
  table{font-size:13px}
  .page{padding:18px 18px calc(100px + var(--sab))}
  .grid4 .c b{font-size:19px}
}
@media (min-width:900px){
  :root{--appw:760px}
  body{font-size:15px}
  .card{padding:20px 24px;border-radius:20px}
  .page{padding:22px 22px calc(104px + var(--sab))}
  .hd .t{font-size:20px}
  .tabs div{min-width:64px;font-size:12px}
  .tabs div .i{font-size:21px}
  table{font-size:13.5px}
  td,th{padding:9px 7px}
  .big{font-size:34px}
}
/* —— 小屏手机 —— */
@media (max-width:350px){
  .tabs div{min-width:47px;font-size:10.5px;padding:5px 2px 6px}
  .tabs div .i{font-size:17px}
  .grid4{gap:5px}.grid4 .c{padding:8px 3px}.grid4 .c b{font-size:16px}
  .quick{gap:6px}.quick .q{padding:10px 2px 8px}
  .quick .q .ic{width:38px;height:38px;font-size:19px}
  .big{font-size:24px}
}

/* —— 深色模式（跟随系统） —— */
@media (prefers-color-scheme: dark){
  :root{--bg:#0d121b;--card:#181f2e;--soft:#202939;--text:#e8edf6;--text2:#8b97ac;--line:#2a3346;--brand:#5d8bff;--brand2:#3b64d9;--sh1:0 1px 2px rgba(0,0,0,.28),0 4px 14px rgba(0,0,0,.3);--sh2:0 10px 30px rgba(0,0,0,.55)}
  body{background:linear-gradient(180deg,#101624 0%,#0d121b 30%,#0b101a 100%);background-attachment:fixed}
  .hd{background:linear-gradient(135deg,#1c3591 0%,#2853c9 55%,#3b6cf6 100%);box-shadow:0 4px 18px rgba(0,0,0,.4)}
  .hd .out{background:rgba(255,255,255,.14)}
  .tabs{background:rgba(20,28,44,.88);box-shadow:0 6px 24px rgba(0,0,0,.45),0 1px 0 rgba(255,255,255,.07) inset;border-color:rgba(255,255,255,.09)}
  .card{box-shadow:var(--sh1),0 0 0 1px rgba(255,255,255,.045) inset}
  .sheet{background:rgba(5,10,24,.62)}
  .sheet .box{background:var(--card);box-shadow:0 -8px 32px rgba(0,0,0,.5)}
  .bubble.you{background:var(--card);border-color:var(--line)}
  .bubble.me{background:linear-gradient(135deg,#3f74e8,#2b52cc)}
  .btn{box-shadow:0 6px 18px rgba(0,0,0,.4),0 1px 0 rgba(255,255,255,.2) inset}
  .btn.ghost{background:rgba(93,139,255,.13);border-color:rgba(93,139,255,.28)}
  .btn.ghost:active{background:rgba(93,139,255,.24)}
  .grid3 .q,.quick .q{background:var(--card);box-shadow:var(--sh1),0 0 0 1px rgba(255,255,255,.045) inset}
  .grid3 .q .ic{background:var(--soft)}
  .quick .q:nth-child(1) .ic{background:#1e2c4d}
  .quick .q:nth-child(2) .ic{background:#123327}
  .quick .q:nth-child(3) .ic{background:#2a1f4d}
  .quick .q:nth-child(4) .ic{background:#3a2a10}
  .grid3 .q:nth-child(1) .ic{background:#3a2a10}
  .grid3 .q:nth-child(2) .ic{background:#123327}
  .grid3 .q:nth-child(3) .ic{background:#1e2c4d}
  .grid4 .c{background:var(--soft);box-shadow:0 0 0 1px rgba(255,255,255,.04) inset}
  .tblwrap thead th{background:var(--card)}
  tbody tr:nth-child(even){background:#1c2536}
  .fi input,.fi select,.fi textarea{background:#121927;border-color:var(--line);color:var(--text)}
  .fi input:focus,.fi select:focus,.fi textarea:focus{background:#141c2c}
  .fi input::placeholder,.fi textarea::placeholder{color:#56617a}
  .chatbox{background:rgba(20,28,44,.9);box-shadow:0 6px 24px rgba(0,0,0,.45),0 1px 0 rgba(255,255,255,.07) inset;border-color:rgba(255,255,255,.09)}
  .chatbox input{background:#121927;border-color:var(--line);color:var(--text)}
  .examtabs button{background:var(--soft)}
  .examtabs button.on{background:linear-gradient(135deg,#3f74e8,#2b52cc);color:#fff}
  .tag{background:#223052;color:#93b2fa}
  .tag.ok{background:#123327;color:#3fd39a}
  .tag.warn{background:#3a2a10;color:#f0a63a}
  .tag.bad{background:#3d1a1a;color:#f08a8a}
  .bar{background:#232c3d}
  .bar i{background:linear-gradient(90deg,#3f74e8,#2b52cc);box-shadow:none}
  .toast{background:rgba(233,240,255,.16)}
  .toast.ok{background:rgba(16,120,84,.88)}
  .toast.bad{background:rgba(160,52,52,.88)}
  .chip{background:#232c3d;color:#a9b4c8}
  .chip.on{background:linear-gradient(135deg,#3f74e8,#2b52cc);color:#fff}
  .ttc{background:#121927;border-color:var(--line);color:var(--text)}
  .clschip{background:#232c3d}
  .hero{background:linear-gradient(135deg,#1c3591 0%,#2853c9 55%,#3b6cf6 100%);box-shadow:0 10px 28px rgba(0,0,0,.45),0 1px 0 rgba(255,255,255,.14) inset}
  .hero .big{background:linear-gradient(180deg,#ffffff,#bcd0ff);-webkit-background-clip:text;background-clip:text}
  .big{background:linear-gradient(135deg,#6d97ff,#4a71e8);-webkit-background-clip:text;background-clip:text}
  .login-logo{box-shadow:0 12px 30px rgba(0,0,0,.5),0 1px 0 rgba(255,255,255,.2) inset}
  .spin{border-color:rgba(93,139,255,.22);border-top-color:#5d8bff}
  .details.hint,.details.hint summary{background:var(--soft)}
  .btop{background:rgba(233,240,255,.14)}
  .hits .hit{background:var(--soft)}
  .hits .hit:active{background:rgba(93,139,255,.16)}
  .clssearch{background:var(--soft)}
  .clssearch:focus{background:#141c2c}
}

/* —— 动效敏感用户 —— */
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}