/* HFL Teaching Hub — shared styles
   Layout: plum + gold storybook palette from the games, calm paper surfaces for the work screens. */
:root{
  --ink:#2E2443;
  --muted:#6F6689;
  --plum:#5B45A8;
  --plum-2:#7A63CC;
  --lilac:#EFEAFE;
  --line:#E4DEF3;
  --paper:#FFFCF5;
  --card:#FFFFFF;
  --gold:#FFC93C;
  --gold-deep:#E9A11E;
  --rose:#E2559A;
  --ok:#2E9E6A;
  --warn:#C9761F;
  --bad:#D2445B;
  --f-display:"Baloo 2","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --f-body:"Atkinson Hyperlegible","PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  --f-letter:"Andika","Comic Sans MS",sans-serif;
  --radius:14px;
  color-scheme:light;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{margin:0;min-height:100%}
body{background:var(--paper);color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased}
a{color:var(--plum)}
h1,h2,h3{font-family:var(--f-display);line-height:1.15;margin:0;text-wrap:balance}
.cn{font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;color:var(--muted);font-weight:400}
.wrap{max-width:1120px;margin:0 auto;padding-left:max(20px,env(safe-area-inset-left,0px));padding-right:max(20px,env(safe-area-inset-right,0px))}

/* buttons & inputs */
.btn{appearance:none;border:0;cursor:pointer;font:600 15px/1 var(--f-body);display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 18px;border-radius:999px;background:var(--plum);color:#fff;text-decoration:none;box-shadow:0 3px 0 #3F2F7E;transition:transform .1s,background .15s}
.btn:hover{background:var(--plum-2)}
.btn:active{transform:translateY(2px);box-shadow:0 1px 0 #3F2F7E}
.btn:focus-visible,.input:focus-visible,.chip-btn:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--gold);outline-offset:2px}
.btn[disabled]{opacity:.55;cursor:default}
.btn.gold{background:linear-gradient(#FFE07A,var(--gold));color:var(--ink);box-shadow:0 3px 0 var(--gold-deep)}
.btn.ghost{background:transparent;color:var(--plum);box-shadow:inset 0 0 0 1.5px var(--line)}
.btn.ghost:hover{background:var(--lilac)}
.btn.small{padding:8px 12px;font-size:13.5px}
.btn.danger{background:var(--bad);box-shadow:0 3px 0 #9E2D40}
.btn.block{width:100%}
label{display:block;font-weight:700;font-size:14px;margin-bottom:6px}
label .cn{font-size:13px;margin-left:4px}
.input,select,textarea{width:100%;font:16px/1.4 var(--f-body);color:var(--ink);background:#fff;border:1.5px solid var(--line);border-radius:10px;padding:11px 13px;transition:border-color .15s}
.input:focus,select:focus,textarea:focus{border-color:var(--plum-2);outline:none}
textarea{min-height:140px;resize:vertical;font-family:ui-monospace,"SF Mono",Menlo,Consolas,monospace;font-size:14px}
.field{display:grid;gap:0}
.hint{font-size:13px;color:var(--muted);margin-top:6px}
.msg{font-size:14px;border-radius:10px;padding:10px 12px;margin:0}
.msg.err{background:#FDECEF;color:#A3263B}
.msg.ok{background:#E7F6EE;color:#1E7550}
.msg:empty{display:none}

/* top bar */
.topbar{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:env(safe-area-inset-top,0px);z-index:5}
.topbar .wrap{display:flex;align-items:center;gap:16px;min-height:66px;flex-wrap:wrap;padding-block:8px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);margin-right:auto}
.brand-mark{width:38px;height:38px;flex:none}
.brand b{font-family:var(--f-display);font-weight:800;font-size:21px;color:var(--plum);display:block;line-height:1}
.brand small{display:block;font-size:12px;color:var(--rose);letter-spacing:.08em;margin-top:2px}
.me{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--lilac);color:var(--plum);display:grid;place-items:center;font:800 15px var(--f-display)}
.me-name{font-weight:700;font-size:14px;margin-right:6px}

/* cards */
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.pill{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:700;padding:3px 10px;border-radius:999px;white-space:nowrap}
.pill::before{content:"";width:7px;height:7px;border-radius:50%;background:currentColor}
.pill.ok{background:#E7F6EE;color:var(--ok)}
.pill.off{background:#F1EFF5;color:#8A8399}
.pill.warn{background:#FDF1E2;color:var(--warn)}
.pill.new{background:#FFF6D9;color:#9A6A00}
.tag{display:inline-block;font-size:12.5px;font-weight:700;padding:3px 9px;border-radius:7px;background:var(--lilac);color:var(--plum)}

/* modal */
.modal-bg{position:fixed;inset:0;background:rgba(46,36,67,.45);display:grid;place-items:center;padding:20px;z-index:50}
.modal{background:var(--card);border-radius:18px;padding:26px;width:min(440px,100%);box-shadow:0 20px 60px rgba(46,36,67,.35);display:grid;gap:16px}
.modal h2{font-size:24px}
.modal .row{display:flex;gap:10px;justify-content:flex-end;flex-wrap:wrap}
.secret{font:700 22px/1.2 ui-monospace,"SF Mono",Menlo,Consolas,monospace;letter-spacing:.06em;background:var(--lilac);color:var(--plum);border-radius:10px;padding:14px;text-align:center;user-select:all;word-break:break-all}

.toast{position:fixed;left:50%;bottom:max(24px,env(safe-area-inset-bottom,0px));transform:translate(-50%,20px);background:var(--ink);color:#fff;padding:12px 18px;border-radius:12px;font-size:14px;opacity:0;pointer-events:none;transition:.25s;z-index:60;max-width:calc(100% - 32px)}
.toast.show{opacity:1;transform:translate(-50%,0)}

@media (prefers-reduced-motion: reduce){*{transition:none!important;animation:none!important}}

/* ===== 平台新增样式 ===== */
.nav{display:flex;gap:4px;flex-wrap:wrap}
.nav a{padding:8px 14px;border-radius:999px;font-weight:700;font-size:14.5px;color:var(--muted);text-decoration:none}
.nav a:hover{background:var(--lilac);color:var(--plum)}
.nav a.on{background:var(--lilac);color:var(--plum)}
.me-name small{display:block;font-size:11.5px;color:var(--muted);font-weight:400;line-height:1.1}
.modal.wide{width:min(720px,100%)}
.modal{max-height:calc(100vh - 40px);overflow:auto}
.page-head{padding-block:30px 18px;display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap}
.page-head h1{font-size:clamp(26px,3.4vw,36px);font-weight:800}
.page-head p{margin:4px 0 0;color:var(--muted)}
.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.toolbar .input,.toolbar select{width:auto;min-width:200px;padding:9px 13px}
.muted{color:var(--muted)}
.small{font-size:13px}
.grow{flex:1}
.stack{display:grid;gap:14px;align-content:start}
.two{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:640px){.two{grid-template-columns:1fr}}

/* 表格 */
.table-wrap{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:auto}
table.t{width:100%;border-collapse:collapse;font-size:14.5px}
table.t th{text-align:left;font-size:12.5px;color:var(--muted);font-weight:700;padding:11px 14px;border-bottom:1px solid var(--line);background:#FBF9FF;white-space:nowrap}
table.t td{padding:11px 14px;border-bottom:1px solid var(--line);vertical-align:middle}
table.t tr:last-child td{border-bottom:0}
table.t td.act{white-space:nowrap;text-align:right}
table.t td.act .btn{margin-left:4px}
.empty-row{padding:30px;text-align:center;color:var(--muted)}

/* 选项卡 */
.tabs{display:flex;gap:6px;flex-wrap:wrap;border-bottom:1px solid var(--line);margin-bottom:20px}
.tabs button{appearance:none;border:0;background:none;font:700 15px var(--f-body);color:var(--muted);padding:12px 14px;cursor:pointer;border-bottom:3px solid transparent;margin-bottom:-1px}
.tabs button.on{color:var(--plum);border-bottom-color:var(--plum)}
.tabs button:focus-visible{outline:3px solid var(--gold)}

/* 封面 */
.cover{position:relative;display:grid;place-items:center;aspect-ratio:16/10}
.cover .ls{display:flex;gap:8px}
.cover .ls span{width:44px;height:48px;border-radius:11px;background:#fff;border:2.5px solid var(--ink);display:grid;place-items:center;font:700 24px var(--f-letter);color:var(--plum);box-shadow:0 3px 0 rgba(46,36,67,.25)}
.cover .ls span:nth-child(odd){transform:rotate(-6deg)}
.cover .ls span:nth-child(even){transform:rotate(5deg) translateY(5px)}
.cover .ls span:nth-child(2){background:#FFE07A}
.cover .ls span:nth-child(3){background:#FFC2D6}
.cover.sm{aspect-ratio:auto;width:84px;height:56px;border-radius:10px;flex:none;overflow:hidden}
.cover.sm .ls{gap:3px}
.cover.sm .ls span{width:18px;height:20px;border-radius:5px;border-width:1.5px;font-size:11px;box-shadow:none}

/* 卡片网格 */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden;display:flex;flex-direction:column;text-decoration:none;color:inherit;transition:transform .15s,box-shadow .15s}
a.card:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(46,36,67,.12)}
.card .cover{border-bottom:1px solid var(--line)}
.card .cb{padding:12px 14px 14px;display:grid;gap:4px}
.card .cb b{font-family:var(--f-display);font-size:18px;line-height:1.2}
.card .cb .cn{font-size:13.5px}
.badge{display:inline-block;font-size:12px;font-weight:700;padding:2px 8px;border-radius:6px;background:var(--lilac);color:var(--plum)}
.badge.game{background:#FFF1D6;color:#9A6A00}
.badge.courseware{background:#FFE3EC;color:#B02A5B}
.badge.video{background:#E2F4E8;color:#2E7D4F}
.badge.temp{background:#FDF1E2;color:var(--warn)}
.badge.gray{background:#F1EFF5;color:#8A8399}