/* public/css/base.css — 设计变量、基础排版、表单与按钮、布局工具、应用外壳、课件视觉（沿用 HTML 课件 v2）与全屏课件；页面样式见 app.css（须在本文件之后加载） */
:root{--bg:#fff;--surface:#f9f8f7;--raised:#fff;--text:#2c2c2b;--muted:#6f6c67;--line:#e6e5e3;--blue:#2783de;--blue2:#e5f2fc;--green:#46a171;--green2:#e8f1ec;--orange:#d5803b;--orange2:#fbebde;--red:#e56458;--red2:#fce9e7;--shadow:0 1px 2px rgba(0,0,0,.05),0 6px 24px rgba(0,0,0,.05);--r:12px}
[data-theme=dark]{--bg:#191919;--surface:#202020;--raised:#262626;--text:#fff;--muted:rgba(255,255,255,.65);--line:rgba(255,255,255,.18);--blue:#5e9fe8;--blue2:rgba(94,159,232,.13);--green:#72bc8f;--green2:rgba(114,188,143,.12);--orange:#de9255;--orange2:rgba(222,146,85,.12);--red:#e97366;--red2:rgba(233,115,102,.12);--shadow:none}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;min-height:100vh;display:flex;flex-direction:column;font:16px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans SC","PingFang SC","Microsoft YaHei",Arial,sans-serif;background:var(--bg);color:var(--text)}
html:not([lang^="zh"]) body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif}
body.deck-open{overflow:hidden}
a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}
h1{font-size:clamp(26px,3.2vw,36px);line-height:1.2;letter-spacing:-.02em;margin:.2em 0 .4em}
h2{font-size:22px;margin:28px 0 12px}h3{font-size:18px;margin:0 0 8px}h4{margin:16px 0 6px}
p{margin:.4em 0}
button,input,textarea,select{font:inherit;color:inherit}button{cursor:pointer}
code,.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
code{background:var(--surface);border:1px solid var(--line);border-radius:5px;padding:0 5px;font-size:.92em}
.muted{color:var(--muted)}.small{font-size:13px}.hint{color:var(--muted);font-size:13px}.center{text-align:center}.nowrap{white-space:nowrap}.grow{flex:1;min-width:0}.mt{margin-top:18px}.big{font-size:20px}
.ok-text{color:var(--green)}.warn-text{color:var(--red)}.orange-text{color:var(--orange)}.live-text{color:var(--red);font-weight:700}
[hidden]{display:none!important}

/* ===== 表单 ===== */
label{display:block;margin:10px 0;font-size:14px;color:var(--muted)}
input:not([type=checkbox]):not([type=radio]):not([type=range]),textarea,select{width:100%;margin-top:5px;padding:10px 12px;background:var(--raised);border:1px solid var(--line);border-radius:8px;outline:none;color:var(--text)}
input:focus,textarea:focus,select:focus{border-color:var(--blue);box-shadow:0 0 0 3px var(--blue2)}
textarea{resize:vertical;line-height:1.5}
.row input:not([type=checkbox]):not([type=radio]):not([type=range]),.row select{width:auto;flex:1;min-width:0;margin-top:0}
.row input[type=number],.row input[type=date]{flex:0 0 auto;width:110px}
.row label{margin:0}
.check-line{display:flex;gap:8px;align-items:center;color:var(--text)}
.check-line input{width:18px;height:18px;accent-color:var(--blue)}
fieldset{border:1px solid var(--line);border-radius:var(--r);padding:12px 16px;margin:14px 0}legend{font-weight:700;padding:0 6px}
.code-input{font-family:ui-monospace,Menlo,monospace;letter-spacing:.2em;text-transform:uppercase;font-size:20px!important;text-align:center}

/* ===== 按钮 ===== */
.icon-btn,.nav-btn,.action-btn{border:1px solid var(--line);background:var(--raised);border-radius:8px;min-width:44px;height:40px;padding:0 13px;display:inline-flex;align-items:center;justify-content:center;gap:7px;color:var(--text);text-decoration:none;white-space:nowrap;font-size:15px}
.icon-btn:hover,.nav-btn:hover,.action-btn:hover{background:var(--surface);text-decoration:none}
.action-btn.primary{background:var(--blue);border-color:var(--blue);color:#fff}.action-btn.primary:hover{filter:brightness(1.06)}
.action-btn.danger{color:var(--red);border-color:color-mix(in srgb,var(--red) 40%,var(--line))}
.action-btn.sm,.icon-btn.sm{height:32px;min-width:32px;padding:0 10px;font-size:13px}
.action-btn.lg{height:48px;padding:0 20px;font-size:16px}
.action-btn.block{width:100%;margin-top:8px}
.action-btn:disabled{opacity:.55;cursor:not-allowed}
.action-btn.loading{position:relative;color:transparent!important}.action-btn.loading:after{content:"";position:absolute;width:16px;height:16px;border:2px solid currentColor;border-color:var(--muted) transparent var(--muted) transparent;border-radius:50%;animation:spin .8s linear infinite}
.action-btn.live-btn{background:var(--red);border-color:var(--red);color:#fff}
.link-btn{background:none;border:0;padding:2px 4px;color:var(--blue);font-size:13px}.link-btn.danger{color:var(--red)}
.chip-btn{border:1px solid var(--line);background:var(--raised);border-radius:999px;padding:6px 12px;font-size:13px}.chip-btn.on{background:var(--blue);border-color:var(--blue);color:#fff}
.spinner{display:inline-block;width:16px;height:16px;border:2px solid var(--line);border-top-color:var(--blue);border-radius:50%;animation:spin .8s linear infinite;vertical-align:-3px}
@keyframes spin{to{transform:rotate(360deg)}}

/* ===== 布局工具 ===== */
.row{display:flex;gap:10px;align-items:center;margin-top:8px}.row.wrap{flex-wrap:wrap}.row.between{justify-content:space-between}.row.end{justify-content:flex-end}.row.center{justify-content:center}
.spacer{flex:1}
.pill{display:inline-flex;align-items:center;gap:6px;padding:4px 9px;border-radius:999px;background:var(--blue2);color:var(--blue);font-size:12.5px;font-weight:700;white-space:nowrap}
.pill.gray{background:var(--surface);color:var(--muted);border:1px solid var(--line)}.pill.green{background:var(--green2);color:var(--green)}.pill.orange{background:var(--orange2);color:var(--orange)}.pill.blue{background:var(--blue2);color:var(--blue)}
.pill.live{background:var(--red2);color:var(--red)}a.pill:hover{text-decoration:none;filter:brightness(.97)}
.card{background:var(--raised);border:1px solid var(--line);border-radius:var(--r);padding:20px;min-width:0;margin-bottom:14px}
.card.soft{background:var(--surface)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:20px}.grid .card{margin:0}
.grid.two{grid-template-columns:repeat(2,1fr)}.grid.four{grid-template-columns:repeat(4,1fr)}.grid.three-auto{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:start}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);margin:10px 0 16px;background:var(--raised)}
.table,.matrix,.flow-table{width:100%;border-collapse:collapse;font-size:14px}
.table th,.table td,.matrix th,.matrix td,.flow-table th,.flow-table td{padding:9px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.table th,.matrix th,.flow-table th{background:var(--surface);font-size:12.5px;color:var(--muted);font-weight:700;position:sticky;top:0}
.table tr:last-child td,.matrix tr:last-child td{border-bottom:0}
.empty{text-align:center;padding:48px 20px;color:var(--muted)}.empty b{display:block;font-size:18px;color:var(--text);margin-bottom:6px}
.note{background:var(--blue2);border-radius:8px;padding:10px 12px;margin:10px 0;font-size:14px}.note.warn{background:var(--orange2)}
.back{display:inline-block;margin:6px 0;font-size:14px}
.md p{margin:.5em 0}.md ul{margin:.4em 0;padding-left:1.3em}

/* ===== 应用外壳 ===== */
.topbar{display:flex;align-items:center;gap:12px;padding:0 20px;border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--bg) 92%,transparent);z-index:20}
.app-top{position:sticky;top:0;height:60px;backdrop-filter:saturate(1.4) blur(8px)}
.brand{display:flex;align-items:center;gap:10px;font-weight:750;white-space:nowrap;color:var(--text)}.brand:hover{text-decoration:none}
.brand-mark{width:30px;height:30px;border-radius:9px;background:var(--blue);color:#fff;display:grid;place-items:center;font-weight:800;font-size:14px}
.main-nav{display:flex;gap:2px;margin-left:12px}
.main-nav a{padding:8px 11px;border-radius:8px;color:var(--muted);font-size:15px}.main-nav a:hover{background:var(--surface);text-decoration:none;color:var(--text)}.main-nav a.on{color:var(--text);background:var(--surface);font-weight:650}
.menu-btn{display:none}
.user-slot{display:flex;gap:8px;align-items:center}
.user-menu{position:relative}.user-menu summary{list-style:none;display:flex;align-items:center;gap:8px;cursor:pointer;padding:4px 8px;border-radius:8px}.user-menu summary::-webkit-details-marker{display:none}.user-menu summary:hover{background:var(--surface)}
.avatar{width:32px;height:32px;border-radius:50%;background:var(--blue2);color:var(--blue);display:grid;place-items:center;font-weight:800}
.menu{position:absolute;right:0;top:44px;min-width:200px;background:var(--raised);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);padding:6px;z-index:30}
.menu a,.menu button{display:block;width:100%;text-align:left;padding:9px 10px;border-radius:7px;border:0;background:none;color:var(--text);font-size:14px}.menu a:hover,.menu button:hover{background:var(--surface);text-decoration:none}
.menu-head{padding:8px 10px;border-bottom:1px solid var(--line);margin-bottom:4px}.menu-head small{display:block;color:var(--muted)}
.announce{display:flex;align-items:center;justify-content:center;gap:10px;padding:8px 16px;background:var(--orange2);font-size:14px}
.main{flex:1;width:100%}
.page{max-width:1180px;margin:0 auto;padding:24px 20px 60px}
.page-narrow{max-width:760px;margin:0 auto;padding:24px 20px 60px}
.page-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap;margin-bottom:10px}
.loading-page{padding:80px 20px;text-align:center;color:var(--muted)}
.app-foot{padding:18px 20px;border-top:1px solid var(--line);color:var(--muted);font-size:13px;text-align:center}
.toast{position:fixed;left:50%;bottom:72px;transform:translateX(-50%);background:var(--text);color:var(--bg);padding:10px 16px;border-radius:8px;opacity:0;pointer-events:none;transition:.2s;z-index:100;max-width:calc(100vw - 32px);text-align:center}
.toast.show{opacity:1}.toast.bad{background:var(--red);color:#fff}
.modal-back{position:fixed;inset:0;background:rgba(0,0,0,.42);display:grid;place-items:center;z-index:80;padding:16px}
.modal{background:var(--raised);border:1px solid var(--line);border-radius:14px;width:min(520px,100%);max-height:calc(100vh - 32px);display:flex;flex-direction:column;box-shadow:0 12px 48px rgba(0,0,0,.22)}
.modal.wide{width:min(820px,100%)}
.modal-head{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:12px 16px;border-bottom:1px solid var(--line)}
.modal-body{padding:14px 18px 18px;overflow:auto}

/* ===== 班级导航 ===== */
.class-bar{border-bottom:1px solid var(--line);background:var(--surface)}
.class-title{max-width:1180px;margin:0 auto;padding:12px 20px 4px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.class-tabs{max-width:1180px;margin:0 auto;padding:0 14px;display:flex;gap:2px;overflow-x:auto;scrollbar-width:none}
.class-tabs a{padding:10px 12px;color:var(--muted);border-bottom:2px solid transparent;white-space:nowrap;font-size:14.5px}.class-tabs a:hover{text-decoration:none;color:var(--text)}.class-tabs a.on{color:var(--text);border-bottom-color:var(--blue);font-weight:650}
.admin-tabs{padding:0;border-bottom:1px solid var(--line);margin-bottom:18px}

/* ===== 课件（沿用 v2 视觉）===== */
.eyebrow{color:var(--blue);font-weight:750;letter-spacing:.08em;text-transform:uppercase;font-size:13px;margin-bottom:10px}
.display{font-size:clamp(38px,6vw,72px);line-height:1.06;letter-spacing:-.045em;margin:0;max-width:880px}
.lead{font-size:clamp(18px,2vw,24px);line-height:1.48;color:var(--muted);max-width:760px;margin:22px 0 0}
.lead-sm{font-size:18px;color:var(--muted);margin:4px 0 12px}
.hero{display:grid;grid-template-columns:1.25fr .75fr;gap:56px;align-items:center}
.hero-art{aspect-ratio:1/1;border-radius:28px;background:linear-gradient(145deg,var(--blue2),var(--surface));border:1px solid var(--line);position:relative;overflow:hidden}
.orb{position:absolute;border-radius:50%;border:1px solid color-mix(in srgb,var(--blue) 42%,transparent)}.orb.a{inset:15%}.orb.b{inset:28%}.orb.c{inset:41%;background:var(--blue);box-shadow:0 0 0 18px color-mix(in srgb,var(--blue) 12%,transparent)}
.orbit-word{position:absolute;font-weight:700;color:var(--muted);font-size:14px}.orbit-word.w1{top:9%;left:40%}.orbit-word.w2{right:4%;top:46%}.orbit-word.w3{bottom:8%;left:38%}.orbit-word.w4{left:4%;top:46%}
.card h3{margin:0 0 8px;font-size:18px}.slide .card p,.agenda .card p,.lesson-card p{margin:0;color:var(--muted)}
.num{font-size:13px;color:var(--blue);font-weight:800;margin-bottom:8px}
.big-num{font-size:clamp(34px,5vw,60px);font-weight:800;letter-spacing:-.04em}
.section-title{font-size:clamp(28px,4vw,46px);line-height:1.14;letter-spacing:-.035em;margin:0}
.section-sub{font-size:18px;color:var(--muted);max-width:720px;margin:14px 0 0}
.quote{font-size:clamp(26px,4vw,46px);line-height:1.26;letter-spacing:-.025em;max-width:970px;margin:0}.quote b{color:var(--blue)}
.flow{display:flex;align-items:stretch;gap:10px;margin-top:28px;overflow-x:auto;padding-bottom:8px}
.step{flex:1;min-width:170px;border:1px solid var(--line);border-radius:12px;padding:18px;background:var(--raised)}.step strong{display:block;font-size:22px;margin-bottom:6px}
.arrow{display:grid;place-items:center;color:var(--muted)}
.list{display:grid;gap:12px;margin-top:20px}
.list-item{display:flex;gap:14px;align-items:flex-start;padding:15px 17px;background:var(--surface);border:1px solid var(--line);border-radius:10px;color:var(--text)}
a.list-item:hover{text-decoration:none;border-color:var(--blue)}
.list-item .check{width:28px;height:28px;border-radius:8px;background:var(--blue2);color:var(--blue);display:grid;place-items:center;flex:0 0 auto;font-weight:800}
.list-item .check.big{width:40px;height:40px;font-size:22px}
.list-item p{margin:1px 0 0}
.reveal [data-reveal]{opacity:.16;filter:blur(2px);transition:.25s}.reveal [data-reveal].shown{opacity:1;filter:none}.reveal{cursor:pointer}
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:22px 0}
.tab{border:1px solid var(--line);background:var(--raised);padding:9px 13px;border-radius:8px}.tab.active{background:var(--blue);color:#fff;border-color:var(--blue)}
.prompt-box{border:1px solid var(--line);background:var(--surface);border-radius:12px;padding:18px;white-space:pre-wrap;max-height:330px;overflow:auto;font-size:15px}
.prompt-box.sm{font-size:13.5px;padding:12px;max-height:220px}
.form{display:grid;grid-template-columns:1fr 1fr;gap:4px 14px;margin-top:20px}.form .wide{grid-column:1/-1}.form label{margin:4px 0}
.form textarea{min-height:88px}
.speaker{padding:12px 14px;border-left:3px solid var(--orange);background:var(--orange2);border-radius:0 8px 8px 0;color:var(--text);margin-top:20px}
.agenda{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:26px}.agenda .card{padding:16px;margin:0}.agenda small{color:var(--muted)}
.kbd{border:1px solid var(--line);border-bottom-width:2px;border-radius:6px;padding:1px 6px;background:var(--surface);font-size:12px}
.lead-md{font-size:20px;max-width:860px}.vote-title{margin-top:24px}

/* ===== 全屏课件 ===== */
.deck{position:fixed;inset:0;z-index:60;background:var(--bg);display:grid;grid-template-rows:60px 1fr 52px}
.deck-top .brand{min-width:0}.deck-lesson{overflow:hidden;text-overflow:ellipsis;max-width:260px}
.module-title{font-size:14px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}
.deck-body{display:flex;min-height:0}
.stage{flex:1;position:relative;overflow:auto;min-width:0}
.slide{min-height:100%;padding:44px clamp(22px,5vw,76px) 60px;display:none;align-items:center}.slide.active{display:flex}
.slide-inner{width:min(1120px,100%);margin:auto}
.deck-side{width:360px;flex:0 0 360px;border-left:1px solid var(--line);overflow:auto;background:var(--surface)}
.footer{display:flex;align-items:center;padding:0 20px;border-top:1px solid var(--line);background:var(--bg);gap:12px}
.progress{height:4px;background:var(--line);position:absolute;left:0;right:0;bottom:51px}.progress>i{display:block;height:100%;width:0;background:var(--blue);transition:width .25s}
.counter{min-width:70px;text-align:center;color:var(--muted);font-size:14px}
.dots{display:flex;gap:5px;overflow:hidden;max-width:280px}.dot{width:6px;height:6px;border-radius:50%;background:var(--line)}.dot.on{background:var(--blue)}
.toolbar-note{color:var(--muted);font-size:13px}
.deck-timer{font-variant-numeric:tabular-nums;font-weight:800;padding:4px 10px;border-radius:8px;background:var(--blue2);color:var(--blue)}.deck-timer.warn{background:var(--red2);color:var(--red)}.deck-timer.done{animation:blink 1s infinite}
@keyframes blink{50%{opacity:.35}}
.deck-pop{position:fixed;z-index:70;top:68px;right:16px;width:min(440px,calc(100vw - 32px));max-height:calc(100vh - 140px);overflow:auto;background:var(--raised);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);padding:14px 16px}
@media(min-width:1101px){.deck.with-side .deck-pop{right:376px;width:min(440px,calc(100vw - 408px))}}
.pop-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.scene-list{margin:0;padding:0;list-style:none;display:grid;gap:4px}.scene-list button{width:100%;text-align:left;border:1px solid transparent;background:none;padding:8px 10px;border-radius:8px;display:flex;gap:10px;align-items:center}.scene-list button:hover{background:var(--surface)}.scene-list button.on{border-color:var(--blue);background:var(--blue2)}
.sid{display:inline-block;min-width:42px;font:700 12px ui-monospace,Menlo,monospace;color:var(--blue);background:var(--blue2);padding:2px 6px;border-radius:6px;text-align:center}
.timer-face{font-size:56px;font-variant-numeric:tabular-nums;font-weight:800;letter-spacing:-.04em;text-align:center}
.pick-face{font-size:40px;font-weight:800;text-align:center;padding:18px 0}.pick-face small{display:block;font-size:14px;color:var(--muted)}
.roster-input{margin-top:10px}
.prompt-item{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:10px 0;border-bottom:1px solid var(--line)}.prompt-item .row{margin:0}
.flow-row{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin:8px 0;font-size:14px}.flow-row p{margin:4px 0}