/* ==========================================================
   Dashboard shell: sidebar, topbar, flashcards, timeline
   ========================================================== */
.app{display:flex;min-height:100vh}

/* ---------------------------------------------------- SIDEBAR */
.sidebar{width:var(--sidebar-w);background:var(--surface);border-right:1px solid var(--line);
  position:fixed;inset:0 auto 0 0;display:flex;flex-direction:column;z-index:60;transition:transform var(--tr)}
.sb-brand{padding:19px 20px;display:flex;align-items:center;gap:12px;border-bottom:1px solid var(--line-2)}
.sb-logo{width:42px;height:42px;border-radius:13px;background:var(--g-primary);display:grid;place-items:center;
  color:#fff;font-size:1.05rem;box-shadow:0 4px 14px rgba(99,102,241,.34);flex:none}
.sb-brand .t1{font-weight:800;font-size:.92rem;letter-spacing:-.02em;line-height:1.2}
.sb-brand .t2{font-size:.66rem;color:var(--muted);margin-top:2px}
.sb-nav{flex:1;overflow-y:auto;padding:14px 12px}
.sb-group{font-size:.62rem;font-weight:800;text-transform:uppercase;letter-spacing:.09em;
  color:var(--faint);padding:15px 12px 7px}
.sb-link{display:flex;align-items:center;gap:12px;padding:10px 13px;border-radius:11px;
  color:var(--ink-2);font-weight:500;font-size:.845rem;cursor:pointer;transition:var(--tr);margin-bottom:2px;position:relative}
.sb-link i{width:19px;text-align:center;font-size:.9rem;color:var(--faint);transition:var(--tr)}
.sb-link:hover{background:var(--slate-soft);color:var(--ink)}
.sb-link:hover i{color:var(--primary)}
.sb-link.active{background:var(--primary-soft);color:var(--primary-dark);font-weight:650}
.sb-link.active i{color:var(--primary)}
.sb-link.active::before{content:'';position:absolute;left:-12px;top:50%;transform:translateY(-50%);
  width:3.5px;height:20px;border-radius:0 4px 4px 0;background:var(--primary)}
.sb-link .pill{margin-left:auto;background:var(--rose);color:#fff;font-size:.62rem;font-weight:800;
  padding:2px 7px;border-radius:var(--r-full);min-width:19px;text-align:center}
.sb-foot{padding:13px;border-top:1px solid var(--line-2)}
.sb-user{display:flex;align-items:center;gap:11px;padding:9px 11px;border-radius:12px;
  background:var(--slate-soft);cursor:pointer;transition:var(--tr)}
.sb-user:hover{background:#eef2f7}
.sb-user .nm{font-weight:650;font-size:.8rem;line-height:1.2;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sb-user .rl{font-size:.66rem;color:var(--muted);text-transform:capitalize}

/* ----------------------------------------------------- MAIN */
.main{flex:1;margin-left:var(--sidebar-w);min-width:0;display:flex;flex-direction:column}
.topbar{height:var(--topbar-h);background:rgba(255,255,255,.86);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);display:flex;align-items:center;gap:16px;padding:0 24px;
  position:sticky;top:0;z-index:50}
.topbar h1{font-size:1.12rem}
.topbar .sub{font-size:.72rem;color:var(--muted);margin-top:1px}
.tb-clock{display:flex;flex-direction:column;align-items:flex-end;line-height:1.25;padding-right:14px;border-right:1px solid var(--line)}
.tb-clock .tm{font-weight:800;font-size:1rem;color:var(--primary-dark)}
.tb-clock .dt{font-size:.68rem;color:var(--muted)}
.tb-btn{width:40px;height:40px;border-radius:12px;border:1px solid var(--line);background:var(--surface);
  display:grid;place-items:center;cursor:pointer;color:var(--ink-2);transition:var(--tr);position:relative}
.tb-btn:hover{background:var(--slate-soft);color:var(--primary)}
.tb-badge{position:absolute;top:-5px;right:-5px;background:var(--rose);color:#fff;font-size:.6rem;
  font-weight:800;min-width:18px;height:18px;border-radius:9px;display:grid;place-items:center;
  padding:0 4px;border:2px solid #fff}
.burger{display:none}
.content{padding:24px;flex:1}
.page-head{margin-bottom:20px}
.page-head h2{font-size:1.35rem;margin-bottom:3px}
.page-head p{color:var(--muted);font-size:.83rem}

/* --------------------------------------------- NOTIFICATION PANEL */
.np{position:fixed;top:calc(var(--topbar-h) + 8px);right:20px;width:370px;max-height:70vh;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-xl);
  z-index:70;display:none;flex-direction:column;overflow:hidden}
.np.open{display:flex;animation:pop .18s ease}
@keyframes pop{from{opacity:0;transform:translateY(-8px) scale(.97)}to{opacity:1;transform:none}}
.np-head{padding:14px 17px;border-bottom:1px solid var(--line-2);display:flex;align-items:center;justify-content:space-between}
.np-list{overflow-y:auto;flex:1}
.np-item{display:flex;gap:12px;padding:13px 17px;border-bottom:1px solid var(--line-2);cursor:pointer;transition:var(--tr)}
.np-item:hover{background:var(--slate-soft)}
.np-item.unread{background:var(--primary-soft)}
.np-item.unread:hover{background:#e5eaff}
.np-ico{width:36px;height:36px;border-radius:11px;display:grid;place-items:center;color:#fff;flex:none;font-size:.82rem}
.np-item .ti{font-weight:650;font-size:.81rem;margin-bottom:2px}
.np-item .ms{font-size:.75rem;color:var(--muted);line-height:1.5}
.np-item .tmm{font-size:.66rem;color:var(--faint);margin-top:4px}

/* ==================== FLASHCARD GRID ==================== */
.flash-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px;margin-bottom:22px}
.stat{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:19px;overflow:hidden;box-shadow:var(--sh-sm);transition:var(--tr)}
.stat:hover{transform:translateY(-3px);box-shadow:var(--sh-lg)}
.stat::after{content:'';position:absolute;inset:0 0 auto 0;height:4px;background:var(--g-primary)}
.stat.sky::after{background:var(--g-sky)}.stat.emerald::after{background:var(--g-emerald)}
.stat.amber::after{background:var(--g-amber)}.stat.rose::after{background:var(--g-rose)}
.stat.pink::after{background:var(--g-pink)}.stat.violet::after{background:var(--g-violet)}
.stat.slate::after{background:var(--g-slate)}
.stat-ico{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;color:#fff;
  font-size:1.05rem;background:var(--g-primary);box-shadow:0 5px 15px rgba(99,102,241,.3);margin-bottom:13px}
.stat.sky .stat-ico{background:var(--g-sky);box-shadow:0 5px 15px rgba(14,165,233,.3)}
.stat.emerald .stat-ico{background:var(--g-emerald);box-shadow:0 5px 15px rgba(16,185,129,.3)}
.stat.amber .stat-ico{background:var(--g-amber);box-shadow:0 5px 15px rgba(245,158,11,.3)}
.stat.rose .stat-ico{background:var(--g-rose);box-shadow:0 5px 15px rgba(244,63,94,.3)}
.stat.pink .stat-ico{background:var(--g-pink);box-shadow:0 5px 15px rgba(236,72,153,.3)}
.stat.violet .stat-ico{background:var(--g-violet);box-shadow:0 5px 15px rgba(139,92,246,.3)}
.stat.slate .stat-ico{background:var(--g-slate);box-shadow:0 5px 15px rgba(100,116,139,.3)}
.stat-label{font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:var(--faint)}
.stat-value{font-size:1.85rem;font-weight:800;letter-spacing:-.03em;margin:3px 0 2px}
.stat-sub{font-size:.75rem;color:var(--muted);display:flex;align-items:center;gap:6px}
.trend-up{color:var(--emerald);font-weight:700}.trend-down{color:var(--rose);font-weight:700}
.bar{height:6px;border-radius:var(--r-full);background:var(--line-2);overflow:hidden;margin-top:11px}
.bar span{display:block;height:100%;border-radius:var(--r-full);background:var(--g-primary);transition:width .6s ease}

/* ============ LIVE ROOM CARDS (hero flashcards) ============ */
.live-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(330px,1fr));gap:18px;margin-bottom:22px}
.live-card{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-xl);
  padding:22px;overflow:hidden;box-shadow:var(--sh);transition:var(--tr)}
.live-card:hover{box-shadow:var(--sh-lg)}
.live-card::before{content:'';position:absolute;inset:0;opacity:.05;pointer-events:none;background:var(--g-primary)}
.live-card.busy{border-color:#a7f3d0}
.live-card.busy::before{background:var(--g-emerald);opacity:.07}
.live-card.free{border-color:#e0e7ff}
.lc-top{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;position:relative;z-index:2;margin-bottom:16px}
.lc-room{display:flex;align-items:center;gap:12px}
.lc-icon{width:48px;height:48px;border-radius:15px;display:grid;place-items:center;color:#fff;font-size:1.1rem;flex:none}
.lc-room h3{font-size:1rem;letter-spacing:-.02em}
.lc-room .cap{font-size:.72rem;color:var(--muted);margin-top:2px}
.lc-pulse{position:relative;width:11px;height:11px;border-radius:50%;background:var(--emerald);flex:none}
.lc-pulse::after{content:'';position:absolute;inset:-6px;border-radius:50%;border:2px solid var(--emerald);
  animation:ring 1.8s cubic-bezier(.2,.6,.4,1) infinite}
@keyframes ring{0%{transform:scale(.6);opacity:.9}100%{transform:scale(1.5);opacity:0}}
.lc-body{position:relative;z-index:2;display:flex;align-items:center;gap:18px}
.lc-info{flex:1;min-width:0}
.lc-title{font-weight:750;font-size:.98rem;margin-bottom:8px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lc-owner{display:flex;align-items:center;gap:9px;margin-bottom:10px}
.lc-owner .nm{font-size:.81rem;font-weight:600}
.lc-owner .jt{font-size:.68rem;color:var(--muted)}
.lc-meta{display:flex;flex-wrap:wrap;gap:7px}
.lc-chip{display:inline-flex;align-items:center;gap:5px;background:var(--slate-soft);border:1px solid var(--line);
  padding:4px 10px;border-radius:var(--r-full);font-size:.71rem;font-weight:600;color:var(--ink-2)}
.lc-chip i{font-size:.65rem;color:var(--muted)}

/* countdown ring */
.ring-wrap{position:relative;width:104px;height:104px;flex:none}
.ring-wrap svg{transform:rotate(-90deg)}
.ring-bg{fill:none;stroke:var(--line-2);stroke-width:8}
.ring-fg{fill:none;stroke:url(#gradEmerald);stroke-width:8;stroke-linecap:round;transition:stroke-dashoffset 1s linear}
.ring-txt{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}
.ring-txt .cd{font-size:1.02rem;font-weight:800;letter-spacing:-.02em;font-variant-numeric:tabular-nums;color:#047857}
.ring-txt .lb{font-size:.58rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--faint)}
.lc-free{text-align:center;padding:8px 0;position:relative;z-index:2}
.lc-free .big{font-size:1.15rem;font-weight:750;color:#047857;margin-bottom:5px}
.lc-free .nxt{font-size:.78rem;color:var(--muted)}
.lc-actions{position:relative;z-index:2;margin-top:16px;display:flex;gap:9px}

/* ================= ROOM TIMELINE ================= */
.tl-room{margin-bottom:20px}
.tl-head{display:flex;align-items:center;gap:10px;margin-bottom:9px}
.tl-head .sw{width:11px;height:11px;border-radius:4px;flex:none}
.tl-head h4{font-size:.86rem}
.tl-bar{position:relative;height:52px;background:var(--slate-soft);border:1px solid var(--line);
  border-radius:12px;overflow:hidden}
.tl-tick{position:absolute;top:0;bottom:0;width:1px;background:var(--line)}
.tl-tick span{position:absolute;top:3px;left:4px;font-size:.58rem;color:var(--faint);font-weight:600;white-space:nowrap}
.tl-block{position:absolute;top:5px;bottom:5px;border-radius:9px;padding:0 9px;display:flex;align-items:center;
  gap:6px;color:#fff;font-size:.7rem;font-weight:650;overflow:hidden;cursor:pointer;transition:var(--tr);
  box-shadow:0 3px 9px rgba(15,23,42,.16)}
.tl-block:hover{transform:translateY(-1px);box-shadow:0 6px 16px rgba(15,23,42,.24);z-index:3}
.tl-block.past{opacity:.5}
.tl-block.live{box-shadow:0 0 0 2px #fff,0 0 0 4px var(--emerald)}
.tl-now{position:absolute;top:0;bottom:0;width:2px;background:var(--rose);z-index:4}
.tl-now::before{content:'';position:absolute;top:-4px;left:-4px;width:10px;height:10px;border-radius:50%;background:var(--rose)}
.tl-gap{position:absolute;top:5px;bottom:5px;border-radius:9px;cursor:pointer;transition:var(--tr)}
.tl-gap:hover{background:rgba(99,102,241,.13);box-shadow:inset 0 0 0 1.5px rgba(99,102,241,.4)}

/* ================= ACTIVITY FEED ================= */
.feed-item{display:flex;gap:13px;padding:12px 0;border-bottom:1px solid var(--line-2)}
.feed-item:last-child{border-bottom:none}
.feed-ico{width:34px;height:34px;border-radius:11px;display:grid;place-items:center;color:#fff;font-size:.75rem;flex:none}
.feed-item .tx{font-size:.81rem;line-height:1.5}
.feed-item .tm{font-size:.68rem;color:var(--faint);margin-top:3px}

/* ================= LAYOUT GRIDS ================= */
.cols{display:grid;gap:18px}
.cols-2{grid-template-columns:1.6fr 1fr}
.cols-2e{grid-template-columns:1fr 1fr}
.cols-3{grid-template-columns:repeat(3,1fr)}