/* ============================================================
   默契问答 · Styles — Google Material Design 3
   ============================================================ */

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-padding-top:70px}
body{
  font-family:var(--font-body);background:var(--surface-alt);color:var(--on-surface);
  line-height:1.6;min-height:100vh;padding-bottom:76px;overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font-family:inherit;font-size:inherit;color:inherit}
button{cursor:pointer;border:none;background:none}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:4px}

.container{max-width:720px;margin:0 auto;padding:0 var(--sp-4)}

/* ---- Top bar ---- */
.topbar{
  position:sticky;top:0;z-index:40;
  background:var(--surface);backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  box-shadow:0 1px 0 var(--outline-variant);
}
.topbar-inner{max-width:720px;margin:0 auto;padding:12px var(--sp-4);display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px}
.brand-mark{width:30px;height:30px;flex-shrink:0}
.brand-name{font-family:var(--font-display);font-weight:700;font-size:18px;letter-spacing:-.01em}
.topbar-actions{display:flex;align-items:center;gap:var(--sp-2)}
.topbar-nav{display:none;gap:var(--sp-4)}
@media(min-width:720px){.topbar-nav{display:flex}}

/* ---- Bottom tab bar ---- */
.tabbar{
  position:fixed;left:0;right:0;bottom:0;z-index:50;display:flex;
  background:var(--surface);border-top:1px solid var(--outline-variant);
  padding:4px var(--sp-2) calc(4px + env(safe-area-inset-bottom));
}
@media(min-width:720px){.tabbar{display:none}}
.tabbar a{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 0;font-size:11px;color:var(--on-surface-variant);border-radius:var(--shape-xs)}
.tabbar a.active{color:var(--primary);font-weight:600}
.tabbar svg{width:22px;height:22px}

/* ---- Buttons (Google M3) ---- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 24px;border-radius:var(--shape-full);font-weight:500;
  font-size:14px;letter-spacing:.01em;transition:all .2s cubic-bezier(.2,0,0,1);
  position:relative;overflow:hidden;
}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--primary);color:var(--on-primary)}
.btn-primary:hover{box-shadow:var(--elevation-2);filter:brightness(.92)}
.btn-secondary{background:var(--surface);color:var(--primary);border:1px solid var(--outline)}
.btn-secondary:hover{background:var(--primary-container);border-color:var(--primary)}
.btn-ghost{background:transparent;color:var(--on-surface-variant);padding:10px 14px}
.btn-ghost:hover{background:var(--surface-alt)}
.btn-block{width:100%}
.btn-sm{padding:10px 18px;font-size:13px;min-height:40px}
.btn[disabled]{opacity:.45;pointer-events:none}

/* ---- Cards (Google M3) ---- */
.card{background:var(--surface);border-radius:var(--shape-md);box-shadow:var(--elevation-1);padding:var(--sp-5)}
.card-tight{padding:var(--sp-4)}

/* ---- Forms (Google M3 outlined) ---- */
.field{margin-bottom:var(--sp-5)}
.field label{display:block;font-size:13px;font-weight:600;color:var(--on-surface-variant);margin-bottom:6px}
.field input[type=text],.field input[type=password],.field textarea,.field select{
  width:100%;padding:13px 14px;border:1px solid var(--outline);border-radius:var(--shape-xs);
  background:var(--surface);font-size:15px;transition:border-color .2s,box-shadow .2s;
}
.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--primary);box-shadow:0 0 0 2px var(--primary-container)}
.field textarea{resize:vertical;min-height:80px}
.field-hint{font-size:12px;color:var(--on-surface-variant);opacity:.7;margin-top:6px}
.field-error{font-size:12px;color:var(--error);margin-top:6px;display:none}

.toggle-row{display:flex;align-items:center;justify-content:space-between;padding:14px 0;border-bottom:1px solid var(--outline-variant)}
.toggle-row:last-child{border-bottom:none}
.switch{position:relative;width:44px;height:26px}
.switch input{opacity:0;width:0;height:0}
.switch .track{position:absolute;inset:0;background:var(--outline);border-radius:999px;transition:background .2s}
.switch .track::after{content:'';position:absolute;width:20px;height:20px;left:3px;top:3px;background:var(--white);border-radius:50%;transition:transform .2s;box-shadow:0 1px 3px rgba(0,0,0,.2)}
.switch input:checked+.track{background:var(--primary)}
.switch input:checked+.track::after{transform:translateX(18px)}

/* ---- Entry grid ---- */
.entry-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--sp-2)}
@media(max-width:480px){.entry-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:360px){.entry-grid{grid-template-columns:repeat(2,1fr)}}
.entry-card{
  background:var(--surface);border-radius:var(--shape-md);padding:var(--sp-4) var(--sp-2);
  display:flex;flex-direction:column;align-items:center;gap:6px;text-align:center;
  box-shadow:var(--elevation-1);transition:box-shadow .2s,transform .15s;
}
.entry-card:hover{box-shadow:var(--elevation-2)}
.entry-card:active{transform:scale(.96)}
.entry-icon{width:44px;height:44px;border-radius:var(--shape-sm);display:flex;align-items:center;justify-content:center}
.entry-label{font-size:12px;font-weight:600}

/* ---- Tags ---- */
.tag{display:inline-flex;align-items:center;padding:4px 10px;border-radius:var(--shape-full);font-size:11px;font-weight:600;background:var(--surface-alt);color:var(--primary)}
.tag-coral{background:var(--error-container);color:var(--error)}
.tag-official{background:var(--tertiary);color:var(--on-primary);font-weight:700}

/* ---- Section headers ---- */
.section-head{display:flex;align-items:baseline;justify-content:space-between;margin:var(--sp-6) 0 var(--sp-3)}
.section-title{font-family:var(--font-display);font-weight:700;font-size:18px}
.section-link{font-size:13px;color:var(--primary);font-weight:600;transition:opacity .15s}
.section-link:hover{opacity:.8}

/* ---- Test list items ---- */
.test-item{
  display:flex;align-items:center;gap:var(--sp-4);background:var(--surface);
  border-radius:var(--shape-md);padding:var(--sp-4);box-shadow:var(--elevation-1);
  margin-bottom:var(--sp-2);transition:box-shadow .2s;
}
.test-item:hover{box-shadow:var(--elevation-2)}
.test-thumb{width:52px;height:52px;border-radius:var(--shape-sm);flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:22px}
.test-meta{flex:1;min-width:0}
.test-title{font-weight:700;font-size:15px;margin-bottom:2px}
.test-sub{font-size:12px;color:var(--on-surface-variant);display:flex;gap:8px;align-items:center;flex-wrap:wrap}

/* ---- Empty state ---- */
.empty{text-align:center;padding:var(--sp-8) var(--sp-4);color:var(--on-surface-variant)}
.empty svg{width:64px;height:64px;margin:0 auto var(--sp-4);opacity:.5}
.empty p{font-size:14px;margin-bottom:var(--sp-4)}

/* ---- Auth pages ---- */
.auth-wrap{min-height:calc(100vh - 60px);display:flex;align-items:center;justify-content:center;padding:var(--sp-5)}
.auth-card{width:100%;max-width:380px}
.auth-title{font-family:var(--font-display);font-weight:800;font-size:26px;margin-bottom:6px}
.auth-sub{font-size:13px;color:var(--on-surface-variant);margin-bottom:var(--sp-6)}
.auth-switch{text-align:center;margin-top:var(--sp-5);font-size:13px;color:var(--on-surface-variant)}
.auth-switch a{color:var(--primary);font-weight:600}

/* ---- Score display ---- */
.num-display{font-family:var(--font-display);font-variant-numeric:tabular-nums}

/* ---- Progress bar ---- */
.progress{height:6px;background:var(--outline-variant);border-radius:var(--shape-full);overflow:hidden}
.progress-fill{height:100%;background:var(--gradient-sync);border-radius:var(--shape-full);transition:width .3s ease}

/* ---- Options ---- */
.option-list{display:flex;flex-direction:column;gap:var(--sp-2)}
.option-btn{
  text-align:left;padding:16px 18px;border-radius:var(--shape-sm);
  border:1.5px solid var(--outline);background:var(--surface);
  color:var(--on-surface);font-size:15px;font-weight:500;transition:border-color .2s,background .2s,transform .1s;
}
[data-theme="dark"] .option-btn{background:var(--surface-alt);border-color:var(--outline-variant)}
.option-btn:hover{border-color:var(--primary)}
.option-btn:active{transform:scale(.98)}
.option-btn.selected{border-color:var(--primary);background:var(--primary-container)}
.option-btn.correct{border-color:var(--secondary);background:var(--secondary-container)}
.option-btn.wrong{border-color:var(--error);background:var(--error-container)}
[data-theme="dark"] .option-btn.selected{background:rgba(138,180,248,.2)}
[data-theme="dark"] .option-btn.correct{background:rgba(52,168,83,.2)}
[data-theme="dark"] .option-btn.wrong{background:rgba(242,139,130,.2)}

/* ---- Question builder ---- */
.qb-item{border:1.5px solid var(--outline);border-radius:var(--shape-md);padding:var(--sp-4);margin-bottom:var(--sp-4);background:var(--surface)}
.qb-item-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--sp-3)}
.qb-opt-row{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.qb-opt-row input[type=text]{flex:1;padding:10px 12px;border:1.5px solid var(--outline);border-radius:var(--shape-xs)}
.qb-radio{flex-shrink:0}

/* ---- Ranking ---- */
.rank-item{display:flex;align-items:center;gap:var(--sp-4);padding:14px var(--sp-2);border-bottom:1px solid var(--outline-variant)}
.rank-item:last-child{border-bottom:none}
.rank-pos{width:30px;text-align:center;font-family:var(--font-display);font-weight:800;font-size:15px;color:var(--on-surface-variant)}
.rank-item.top1 .rank-pos,.rank-item.top2 .rank-pos,.rank-item.top3 .rank-pos{color:var(--tertiary);font-size:18px}
.rank-avatar{width:36px;height:36px;border-radius:50%;background:var(--gradient-sync);flex-shrink:0;display:flex;align-items:center;justify-content:center;color:var(--white);font-weight:700;font-size:13px}
.rank-info{flex:1;min-width:0}
.rank-name{font-weight:600;font-size:14px}
.rank-time{font-size:12px;color:var(--on-surface-variant)}
.rank-score{font-family:var(--font-display);font-weight:800;font-size:17px;color:var(--secondary)}

/* ---- Category tabs ---- */
.tabs{display:flex;gap:5px;overflow-x:auto;padding:4px 0 10px;-webkit-overflow-scrolling:touch;scrollbar-width:none;flex-wrap:nowrap;-ms-overflow-style:none}
.tabs::-webkit-scrollbar{display:none}
.tabs::after{content:'';flex:0 0 1px;padding-right:1px}
.tab-chip{
  flex-shrink:0;padding:6px 12px;border-radius:var(--shape-full);
  border:1.5px solid var(--outline);font-size:12px;font-weight:600;
  color:var(--on-surface-variant);white-space:nowrap;transition:all .2s;
}
.tab-chip:hover:not(.active){border-color:var(--primary);color:var(--primary)}
.tab-chip.active{background:var(--primary);border-color:var(--primary);color:var(--on-primary)}

/* ---- Search box (Google-style pill) ---- */
.search-box{
  display:flex;align-items:center;gap:10px;background:var(--surface);
  border:1px solid var(--outline);border-radius:var(--shape-full);
  padding:12px 18px;margin-bottom:var(--sp-4);transition:border-color .2s,box-shadow .2s;
}
.search-box:focus-within{border-color:var(--primary);box-shadow:0 0 0 2px var(--primary-container)}
.search-box input{flex:1;border:none;outline:none;background:transparent;font-size:14px}
.search-box svg{width:20px;height:20px;color:var(--on-surface-variant);flex-shrink:0}

/* ---- Bank question cards ---- */
.bank-card{display:flex;flex-direction:column;gap:8px}
.bank-card-head{display:flex;align-items:center;justify-content:space-between}
.bank-card-title{font-weight:700;font-size:15px;line-height:1.4}
.bank-card-opts{display:flex;flex-wrap:wrap;gap:4px;max-width:100%}
.opt-chip{display:inline-flex;align-items:center;padding:3px 8px;border-radius:var(--shape-xs);font-size:11px;font-weight:500;background:var(--surface-alt);color:var(--on-surface-variant);border:1px solid var(--outline-variant);line-height:1.3;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
[data-theme="dark"] .opt-chip{background:rgba(255,255,255,.06);color:#BCC0C5;border-color:rgba(255,255,255,.1)}

/* ---- Messages ---- */
.msg-card{display:flex;flex-direction:column;gap:10px;transition:box-shadow .2s}
.msg-card:hover{box-shadow:var(--elevation-2)}
.msg-head{display:flex;align-items:center;justify-content:space-between}
.msg-user{display:flex;align-items:center;gap:12px}
.msg-avatar{width:36px;height:36px;border-radius:50%;flex-shrink:0;background:var(--gradient-sync);display:flex;align-items:center;justify-content:center;color:var(--white);font-weight:700;font-size:13px}
.msg-avatar-lg{width:44px;height:44px;font-size:16px}
.msg-name{font-weight:600;font-size:14px}
.msg-time{font-size:12px;color:var(--on-surface-variant)}
.msg-body{font-size:14px;line-height:1.65;color:var(--on-surface);word-break:break-word}
.msg-foot{display:flex;align-items:center;gap:12px;margin-top:2px}
.reply-hint{font-size:12px;color:var(--on-surface-variant)}
.msg-detail-card{padding:var(--sp-5)}

#postBox textarea,textarea#replyInput{
  width:100%;padding:12px 14px;border:1.5px solid var(--outline);border-radius:var(--shape-xs);
  background:var(--surface);font-size:14px;resize:vertical;min-height:72px;color:var(--on-surface);transition:border-color .2s;
}
#postBox textarea:focus,textarea#replyInput:focus{border-color:var(--primary);outline:none}

/* ---- Reply items ---- */
.reply-item{display:flex;gap:12px;padding:14px var(--sp-2);border-bottom:1px solid var(--outline-variant);background:var(--surface);border-radius:var(--shape-xs)}
.reply-item:last-child{border-bottom:none}
.reply-avatar{width:32px;height:32px;border-radius:50%;flex-shrink:0;background:var(--surface-alt);display:flex;align-items:center;justify-content:center;color:var(--on-surface-variant);font-weight:600;font-size:12px}
.reply-content{flex:1;min-width:0}
.reply-head{display:flex;align-items:center;gap:8px;margin-bottom:4px;flex-wrap:wrap}
.reply-name{font-weight:600;font-size:13px}
.reply-time{font-size:11px;color:var(--on-surface-variant)}
.reply-body{font-size:14px;line-height:1.55;color:var(--on-surface);word-break:break-word}

/* ---- Profile ---- */
.profile-head{display:flex;align-items:center;gap:var(--sp-4);padding:var(--sp-5) 0}
.profile-avatar{width:64px;height:64px;border-radius:50%;background:var(--gradient-sync);flex-shrink:0;display:flex;align-items:center;justify-content:center;color:var(--white);font-weight:700;font-size:24px}
.profile-name{font-family:var(--font-display);font-weight:700;font-size:19px}
.profile-id{font-size:12px;color:var(--on-surface-variant)}
.mini-stats{display:flex;gap:var(--sp-2);margin:var(--sp-4) 0}
.mini-stat{flex:1;background:var(--surface);border-radius:var(--shape-md);padding:var(--sp-4);text-align:center;box-shadow:var(--elevation-1)}
.mini-stat b{display:block;font-family:var(--font-display);font-size:22px;font-weight:800}
.mini-stat span{font-size:11px;color:var(--on-surface-variant)}

/* ---- Toast ---- */
.toast{position:fixed;left:50%;bottom:96px;transform:translateX(-50%) translateY(20px);background:var(--on-surface);color:var(--surface);padding:12px 20px;border-radius:var(--shape-full);font-size:13px;opacity:0;pointer-events:none;z-index:100;transition:opacity .25s,transform .25s;max-width:88vw;text-align:center}
[data-theme="dark"] .toast{background:rgba(255,255,255,.92);color:#202124}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* dark mode form fixes */
[data-theme="dark"] .field input[type=text],
[data-theme="dark"] .field input[type=password],
[data-theme="dark"] .field textarea,
[data-theme="dark"] .field select{background:var(--surface-alt);border-color:var(--outline-variant);color:var(--on-surface)}
[data-theme="dark"] .field input:focus,
[data-theme="dark"] .field textarea:focus,
[data-theme="dark"] .field select:focus{border-color:var(--primary)}
[data-theme="dark"] .search-box{background:var(--surface-alt);border-color:var(--outline-variant)}
[data-theme="dark"] .search-box input{color:var(--on-surface)}
[data-theme="dark"] .qb-opt-row input[type=text]{background:var(--surface-alt);border-color:var(--outline-variant);color:var(--on-surface)}

/* ---- Utility ---- */
.stack{display:flex;flex-direction:column;gap:var(--sp-3)}
.row{display:flex;align-items:center}
.row-between{display:flex;align-items:center;justify-content:space-between}
.mt-6{margin-top:var(--sp-6)}
.mt-7{margin-top:var(--sp-7)}
.center{text-align:center}
.muted{color:var(--on-surface-variant)}
.small{font-size:12px}