:root{--ink: #12242b;--ink-soft: #3d565f;--muted: #7a929b;--bg: #f4f7f7;--surface: #ffffff;--line: #e3ebeb;--primary: #0d7377;--primary-strong: #0a5c5f;--primary-soft: #e0f2f1;--grad: linear-gradient(135deg, #0d7377 0%, #14a085 100%);--accent: #f4a261;--accent-soft: #fdf0e3;--danger: #dc4b4b;--danger-soft: #fdeaea;--success: #2a9d5c;--success-soft: #e6f6ec;--sidebar: #0e1f26;--sidebar-ink: #9fb8bf;--radius: 16px;--radius-sm: 10px;--shadow: 0 1px 3px rgba(18, 36, 43, .06), 0 8px 24px rgba(18, 36, 43, .07);--shadow-lg: 0 4px 12px rgba(18, 36, 43, .1), 0 20px 48px rgba(18, 36, 43, .16);--font-display: "Sora", system-ui, sans-serif;--font-body: "Inter", system-ui, sans-serif}:root[data-theme=dark]{--ink: #e7eef0;--ink-soft: #b3c4c9;--muted: #7e979e;--bg: #0b1519;--surface: #13232a;--line: #21363e;--primary: #17a8a0;--primary-strong: #4fd1c5;--primary-soft: #123333;--grad: linear-gradient(135deg, #0d7377 0%, #14a085 100%);--accent: #f4a261;--accent-soft: #3a2b1a;--danger: #f0736f;--danger-soft: #3a1e1e;--success: #4ec98a;--success-soft: #16321f;--sidebar: #0a1216;--sidebar-ink: #8ba7af;--shadow: 0 1px 3px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);--shadow-lg: 0 4px 12px rgba(0,0,0,.4), 0 20px 48px rgba(0,0,0,.55)}:root[data-theme=dark] .msg.assistant{background:#1a2d35}:root[data-theme=dark] .msg.assistant code{background:#24404a}:root[data-theme=dark] .chat-sessions button{color:var(--ink-soft)}:root[data-theme=dark] .heat-cell{background:#1a2b32}:root[data-theme=dark] .opt{background:var(--surface)}:root[data-theme=dark] .input,:root[data-theme=dark] select.input,:root[data-theme=dark] textarea.input{background:#0f1d23;color:var(--ink)}:root[data-theme=dark] .mat-thumb{background:var(--primary-soft)}:root[data-theme=dark] 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label{display:block;font-size:12.5px;font-weight:600;color:var(--ink-soft);margin-bottom:5px}.row{display:flex;gap:12px}.row>*{flex:1}.chip{display:inline-flex;align-items:center;font-size:11.5px;font-weight:600;padding:3px 10px;border-radius:999px;background:var(--primary-soft);color:var(--primary-strong)}.chip.accent{background:var(--accent-soft);color:#a05e1c}.chip.gray{background:#eef2f2;color:var(--muted)}.empty{text-align:center;padding:48px 20px;color:var(--muted)}.empty .big{font-size:40px;margin-bottom:10px}.modal-bg{position:fixed;top:0;right:0;bottom:0;left:0;background:#0e1f2680;z-index:100;display:flex;align-items:center;justify-content:center;padding:18px;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px)}.modal{background:#fff;border-radius:20px;padding:26px;width:100%;max-width:560px;max-height:90dvh;overflow-y:auto;box-shadow:var(--shadow-lg)}.modal h2{font-size:19px;margin-bottom:18px}.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:20px}.login-wrap{min-height:100dvh;display:flex;align-items:center;justify-content:center;background:radial-gradient(1200px 800px at 80% -10%,#14a08533,transparent),radial-gradient(900px 600px at -10% 110%,#0d737733,transparent),var(--sidebar);padding:20px}.login-card{width:100%;max-width:400px;background:#fff;border-radius:24px;padding:40px 36px;box-shadow:var(--shadow-lg)}.login-card .logo{width:64px;height:64px;border-radius:18px;margin-bottom:18px}.login-card h1{font-size:24px}.login-card .sub{color:var(--muted);font-size:14px;margin:6px 0 26px}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin-bottom:22px}.stat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow)}.stat .num{font-family:var(--font-display);font-size:27px;font-weight:700}.stat .lbl{font-size:12.5px;color:var(--muted);font-weight:500}.stat.hero{background:var(--grad);border:none;color:#fff}.stat.hero .lbl{color:#c9ecdf}.hero-banner{background:var(--grad);border-radius:20px;color:#fff;padding:26px 28px;margin-bottom:22px;display:flex;justify-content:space-between;align-items:center;gap:18px;flex-wrap:wrap;box-shadow:0 10px 30px #0d737759}.hero-banner h2{font-size:21px}.hero-banner p{margin:5px 0 0;color:#d4f0e6;font-size:14px}.hero-banner .btn{background:#fff;color:var(--primary-strong);box-shadow:none}.quick-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px}.quick{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);transition:all .15s;color:var(--ink);display:block}.quick:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);border-color:var(--primary)}.quick .ico{font-size:26px}.quick h3{font-size:15px;margin:10px 0 3px}.quick p{margin:0;font-size:12.5px;color:var(--muted)}.filters{display:flex;gap:10px;margin-bottom:18px;flex-wrap:wrap}.filters .input{width:auto;min-width:140px}.filters .search{flex:1;min-width:200px}.mat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px}.mat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:all .15s;cursor:pointer}.mat:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.mat-thumb{height:120px;background:var(--primary-soft);display:flex;align-items:center;justify-content:center;font-size:38px;overflow:hidden}.mat-thumb img{width:100%;height:100%;object-fit:cover}.mat-body{padding:12px 14px}.mat-body h3{font-size:14px;font-weight:600;font-family:var(--font-body);overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.mat-meta{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap}.viewer-bg{position:fixed;top:0;right:0;bottom:0;left:0;background:#0a1419eb;z-index:120;display:flex;flex-direction:column}.viewer-top{display:flex;justify-content:space-between;align-items:center;padding:12px 18px;color:#fff;gap:10px}.viewer-top h3{font-size:15px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.viewer-body{flex:1;display:flex;align-items:center;justify-content:center;overflow:auto;padding:0 14px 14px}.viewer-body iframe{width:100%;height:100%;border:none;border-radius:10px;background:#fff}.viewer-body img{max-width:100%;max-height:100%;border-radius:10px}.deck-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}.deck{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);transition:all .15s;position:relative}.deck:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.deck h3{font-size:16px;margin-bottom:4px}.deck .meta{font-size:12.5px;color:var(--muted)}.deck .due-pill{position:absolute;top:14px;right:14px;background:var(--accent);color:#4a2c0d;font-weight:700;font-size:12px;border-radius:999px;padding:2px 10px}.deck-foot{display:flex;gap:8px;margin-top:14px}.study-wrap{max-width:640px;margin:0 auto}.study-card{background:var(--surface);border-radius:22px;box-shadow:var(--shadow-lg);padding:34px 30px;min-height:300px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:14px;border:1px solid var(--line)}.study-card .q{font-size:19px;font-weight:600;white-space:pre-wrap}.study-card .a{font-size:16.5px;color:var(--ink-soft);white-space:pre-wrap;border-top:2px dashed var(--line);padding-top:18px;width:100%}.study-card 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img{max-width:100%;display:block;border-radius:12px;-webkit-user-select:none;user-select:none;-webkit-user-drag:none}.occ-box{position:absolute;background:var(--accent);border:2px solid #d9822b;border-radius:6px;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;color:#4a2c0d;overflow:hidden}.occ-box.revealed{background:#2a9d5ce0;border-color:var(--success);color:#fff}.occ-box.editing{background:#f4a2618c}.occ-box .del{position:absolute;top:0;right:2px;font-size:12px;color:#7c1d1d}.q-card{max-width:720px;margin:0 auto}.q-stem{font-size:16px;font-weight:600;margin-bottom:18px;white-space:pre-wrap}.opt{display:flex;gap:12px;align-items:flex-start;width:100%;text-align:left;background:#fff;border:1.5px solid var(--line);border-radius:12px;padding:12px 14px;margin-bottom:9px;font-size:14.5px;transition:all .12s;color:var(--ink)}.opt:hover{border-color:var(--primary)}.opt .letter{width:26px;height:26px;border-radius:8px;background:var(--primary-soft);color:var(--primary-strong);font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:13px}.opt.correct{border-color:var(--success);background:var(--success-soft)}.opt.correct .letter{background:var(--success);color:#fff}.opt.wrong{border-color:var(--danger);background:var(--danger-soft)}.opt.wrong .letter{background:var(--danger);color:#fff}.explain{background:var(--primary-soft);border-radius:12px;padding:14px 16px;font-size:14px;margin-top:14px;white-space:pre-wrap}.chat-layout{display:flex;gap:16px;height:calc(100dvh - 150px);min-height:420px}.chat-sessions{width:220px;flex-shrink:0;overflow-y:auto;display:flex;flex-direction:column;gap:6px}.chat-sessions button{text-align:left;background:var(--surface);border:1px solid var(--line);padding:10px 12px;border-radius:var(--radius-sm);font-size:13px;color:var(--ink-soft);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-sessions button.active{border-color:var(--primary);background:var(--primary-soft);color:var(--primary-strong);font-weight:600}.chat-main{flex:1;display:flex;flex-direction:column;background:var(--surface);border-radius:var(--radius);border:1px solid var(--line);box-shadow:var(--shadow);min-width:0}.chat-scroll{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:14px}.msg{max-width:85%;padding:12px 16px;border-radius:16px;font-size:14.5px}.msg.user{align-self:flex-end;background:var(--grad);color:#fff;border-bottom-right-radius:4px}.msg.assistant{align-self:flex-start;background:#f2f6f6;border-bottom-left-radius:4px}.msg.assistant h1,.msg.assistant h2,.msg.assistant h3{font-size:15px;margin:10px 0 4px}.msg.assistant ul,.msg.assistant ol{margin:6px 0;padding-left:20px}.msg.assistant code{background:#e3ebeb;padding:1px 5px;border-radius:5px;font-size:13px}.msg.assistant pre{background:#12242b;color:#d6e4e4;padding:12px;border-radius:10px;overflow-x:auto;font-size:13px}.msg.assistant pre code{background:none;padding:0;color:inherit}.chat-input{display:flex;gap:10px;padding:14px;border-top:1px solid var(--line)}.chat-input textarea{flex:1;min-height:46px;max-height:140px}@media(max-width:860px){.chat-sessions{display:none}.chat-layout{height:calc(100dvh - 210px)}}.heatmap{display:grid;grid-template-columns:repeat(auto-fill,13px);gap:3px}.heat-cell{width:13px;height:13px;border-radius:3px;background:#e8eeee}.heat-1{background:#b2e3d5}.heat-2{background:#5cc4a4}.heat-3{background:#14a085}.heat-4{background:#0a5c5f}.bar-row{display:flex;align-items:center;gap:10px;margin-bottom:10px}.bar-row .lbl{width:140px;font-size:13px;font-weight:500;text-align:right;flex-shrink:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.bar-track{flex:1;height:22px;background:#eef2f2;border-radius:7px;overflow:hidden}.bar-fill{height:100%;background:var(--grad);border-radius:7px;display:flex;align-items:center;justify-content:flex-end;padding-right:8px;color:#fff;font-size:11.5px;font-weight:700;min-width:34px}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:18px}@media(max-width:860px){.grid-2{grid-template-columns:1fr}}.mt{margin-top:18px}.spinner{width:22px;height:22px;border:3px solid var(--primary-soft);border-top-color:var(--primary);border-radius:50%;animation:spin .7s linear infinite;margin:0 auto}@keyframes spin{to{transform:rotate(360deg)}}.theme-btn{background:none;border:none;color:var(--sidebar-ink);font-size:17px;padding:4px 6px;border-radius:8px}.theme-btn:hover{color:#fff;background:#ffffff14}.search-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:150;background:#0a14198c;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);display:flex;justify-content:center;align-items:flex-start;padding:12vh 16px 16px}.search-box{width:100%;max-width:620px;background:var(--surface);border-radius:18px;box-shadow:var(--shadow-lg);overflow:hidden}.search-box input{width:100%;border:none;padding:18px 22px;font-size:17px;background:transparent;color:var(--ink);outline:none;border-bottom:1px solid var(--line)}.search-results{max-height:55vh;overflow-y:auto}.search-group-title{font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);padding:12px 22px 4px;font-weight:700}.search-item{display:flex;gap:12px;align-items:center;padding:11px 22px;cursor:pointer}.search-item:hover,.search-item.sel{background:var(--primary-soft)}.search-item .ico{font-size:18px}.search-item .txt{flex:1;min-width:0}.search-item .txt strong{font-size:14px;font-weight:600;display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.search-item .txt span{font-size:12px;color:var(--muted)}.search-hint{padding:10px 22px;font-size:12px;color:var(--muted);border-top:1px solid var(--line);display:flex;gap:14px}.kbd{background:var(--line);border-radius:5px;padding:1px 6px;font-size:11px;font-family:monospace}.goal-ring{display:flex;align-items:center;gap:16px}.ring{width:76px;height:76px;flex-shrink:0}.ring-track{fill:none;stroke:var(--line);stroke-width:9}.ring-fill{fill:none;stroke:url(#ringgrad);stroke-width:9;stroke-linecap:round;transition:stroke-dashoffset .6s}.ring-label{font-family:var(--font-display);font-weight:700;font-size:16px;fill:var(--ink)}.exam-row{display:flex;align-items:center;gap:14px;padding:14px 16px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);margin-bottom:10px}.exam-count{width:62px;height:62px;border-radius:14px;flex-shrink:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--primary-soft);color:var(--primary-strong)}.exam-count.soon{background:var(--accent-soft);color:#c67b28}.exam-count.urgent{background:var(--danger-soft);color:var(--danger)}.exam-count .n{font-family:var(--font-display);font-size:22px;font-weight:700;line-height:1}.exam-count .u{font-size:10px;text-transform:uppercase;letter-spacing:.05em}.exam-info{flex:1;min-width:0}.exam-info h3{font-size:15px;font-family:var(--font-body)}.exam-info .meta{font-size:12.5px;color:var(--muted)}.exam-plan{font-size:12.5px;color:var(--primary-strong);font-weight:600;margin-top:3px}.seg{display:inline-flex;background:var(--line);border-radius:12px;padding:3px;gap:3px}.seg button{border:none;background:none;padding:8px 18px;border-radius:9px;font-weight:600;font-size:13.5px;color:var(--muted)}.seg button.active{background:var(--surface);color:var(--primary-strong);box-shadow:var(--shadow)}.provider-card{border:2px solid var(--line);border-radius:var(--radius);padding:16px;cursor:pointer;transition:all .15s}.provider-card.active{border-color:var(--primary);background:var(--primary-soft)}.provider-card h3{font-size:15px;margin-bottom:4px}.provider-card p{font-size:12.5px;color:var(--muted);margin:0}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%);background:var(--ink);color:#fff;padding:12px 22px;border-radius:12px;font-size:14px;z-index:200;box-shadow:var(--shadow-lg);animation:toast-in .25s}@keyframes toast-in{0%{opacity:0;transform:translate(-50%,10px)}}