:root{--blue:#1a6bff;--bbr:#4d8fff;--navy:#040d1f;--nc:#0a1c3a;--nm:#071428;--nb:rgba(26,107,255,0.18);--wh:#f0f4ff;--mu:rgba(180,200,255,0.5);--gn:#22c55e;--rd:#ef4444;--yl:#f59e0b;--pu:#a855f7;--or:#f97316;--cy:#06b6d4;--fd:'Syne',sans-serif;--fb:'DM Sans',sans-serif}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{background:var(--nm);color:var(--wh);font-family:var(--fb);min-height:100vh;display:none}
.shell{display:flex;min-height:100vh}
.sb{width:72px;background:var(--navy);border-right:1px solid var(--nb);display:flex;flex-direction:column;align-items:center;padding:20px 0;position:fixed;top:0;bottom:0;z-index:10}
.sb-logo{font-family:var(--fd);font-size:11px;font-weight:800;color:var(--bbr);margin-bottom:28px}
.sb-i{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:18px;color:var(--mu);cursor:pointer;transition:all 0.2s;margin-bottom:6px;position:relative;text-decoration:none}
.sb-i:hover{background:rgba(26,107,255,0.08);color:var(--wh)}
.sb-i.active{background:rgba(26,107,255,0.15);color:var(--bbr)}
.sb-i.active::before{content:'';position:absolute;left:-2px;top:50%;transform:translateY(-50%);width:4px;height:20px;background:var(--blue);border-radius:0 4px 4px 0}
.sb-tt{display:none;position:absolute;left:56px;top:50%;transform:translateY(-50%);background:var(--nc);border:1px solid var(--nb);border-radius:8px;padding:6px 12px;font-size:11px;color:var(--wh);white-space:nowrap;z-index:20;pointer-events:none}
.sb-i:hover .sb-tt{display:block}
.sb-sp{flex:1}
.sb-av{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--pu));display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;cursor:pointer;text-decoration:none;color:white}
.ct{margin-left:72px;flex:1;display:flex;flex-direction:column}

/* Shared Components */
.card{background:var(--nc);border:1px solid var(--nb);border-radius:16px;overflow:hidden}
.card-h{padding:16px 20px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--nb)}
.card-t{font-family:var(--fd);font-size:14px;font-weight:700;display:flex;align-items:center;gap:8px}
.card-b{padding:16px 20px}
.badge{font-size:10px;font-weight:600;padding:2px 8px;border-radius:100px;background:rgba(26,107,255,0.12);color:var(--bbr)}
.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:10px;font-size:13px;font-weight:600;font-family:var(--fb);cursor:pointer;border:none;transition:all 0.2s;text-decoration:none}
.btn-blue{background:var(--blue);color:white}.btn-blue:hover{background:var(--bbr)}
.btn-ghost{background:rgba(255,255,255,0.05);color:var(--mu);border:1px solid var(--nb)}.btn-ghost:hover{color:var(--wh)}
.btn-sm{padding:6px 12px;font-size:11px;border-radius:8px}
.empty{text-align:center;padding:32px 16px;color:var(--mu);font-size:13px}
.empty-icon{font-size:28px;margin-bottom:8px}
.spinner{display:inline-block;width:16px;height:16px;border:2px solid rgba(255,255,255,0.1);border-top-color:var(--bbr);border-radius:50%;animation:spin 0.6s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.back-btn{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--mu);cursor:pointer;margin-bottom:16px;padding:6px 12px;border-radius:8px;border:none;background:none;font-family:var(--fb);transition:color 0.2s;text-decoration:none}
.back-btn:hover{color:var(--wh)}
.ftab{padding:6px 14px;border-radius:8px;font-size:11px;font-weight:600;cursor:pointer;border:1px solid var(--nb);background:none;color:var(--mu);font-family:var(--fb);transition:all 0.2s}
.ftab.active{background:rgba(26,107,255,0.12);color:var(--wh);border-color:rgba(26,107,255,0.3)}

/* Header */
.hdr{padding:28px 36px 0;position:relative;overflow:hidden}
.hdr-glow{position:absolute;top:-100px;right:-50px;width:400px;height:300px;border-radius:50%;background:rgba(26,107,255,0.08);filter:blur(80px);pointer-events:none}
.greet{font-family:var(--fd);font-size:28px;font-weight:800;letter-spacing:-0.5px;position:relative;z-index:1}
.hdr-date{font-size:14px;color:var(--mu);margin-top:4px;position:relative;z-index:1}

/* Day strip */
.ds{padding:20px 36px 0;display:flex;align-items:center;gap:8px}
.ds-nav{width:28px;height:28px;border-radius:50%;background:var(--nc);border:1px solid var(--nb);display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:11px;color:var(--mu);flex-shrink:0}
.ds-nav:hover{color:var(--wh)}
.ds-lbl{font-size:12px;color:var(--mu);font-weight:500;min-width:90px;text-align:center}
.ds-days{display:flex;gap:6px;flex:1;justify-content:center}
.ds-d{width:54px;height:60px;border-radius:12px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;cursor:pointer;transition:all 0.2s;border:1px solid transparent;position:relative}
.ds-d:hover{background:rgba(26,107,255,0.06)}
.ds-d.sel{background:var(--blue);border-color:var(--blue);color:white}
.ds-d.today:not(.sel){border-color:rgba(26,107,255,0.3)}
.ds-d .c{font-size:11px;font-weight:500;color:var(--mu)}.ds-d .n{font-size:16px;font-weight:700}
.ds-d.sel .c{color:rgba(255,255,255,0.7)}
.ds-d.hc::after{content:'';position:absolute;bottom:6px;width:4px;height:4px;border-radius:50%;background:var(--bbr)}
.ds-d.sel.hc::after{background:rgba(255,255,255,0.6)}

/* Grid */
.grid{display:grid;grid-template-columns:1fr 380px;gap:20px;padding:24px 36px 36px}

/* Schedule */
.sc{display:flex;align-items:center;gap:14px;padding:14px 8px;border-bottom:1px solid rgba(26,107,255,0.06);border-radius:8px;margin:0 -8px}
.sc:last-child{border-bottom:none}.sc:hover{background:rgba(26,107,255,0.04)}
.sc-dot{width:4px;height:36px;border-radius:4px;flex-shrink:0}
.sc-code{font-size:14px;font-weight:600}.sc-name{font-size:11px;color:var(--mu);margin-top:1px}
.sc-time{font-size:12px;color:var(--mu);text-align:right;white-space:nowrap}
.sc-loc{font-size:10px;color:rgba(180,200,255,0.35);margin-top:2px;text-align:right}

/* Assignments */
.ai{display:flex;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid rgba(26,107,255,0.06)}.ai:last-child{border-bottom:none}
.ai-chk{width:20px;height:20px;border-radius:6px;border:2px solid rgba(26,107,255,0.3);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all 0.2s;flex-shrink:0}
.ai-chk:hover{border-color:var(--blue)}
.ai-chk.started{border-color:var(--yl);background:rgba(245,158,11,0.1)}.ai-chk.started::after{content:'';width:8px;height:8px;border-radius:2px;background:var(--yl)}
.ai-chk.done{border-color:var(--gn);background:var(--gn)}.ai-chk.done::after{content:'✓';font-size:12px;color:white;font-weight:700}
.ai-chk.overdue{border-color:var(--rd);background:rgba(239,68,68,0.1)}.ai-chk.overdue::after{content:'!';font-size:11px;color:var(--rd);font-weight:700}
.ai-title{font-size:13px;font-weight:500}.ai-title.dt{text-decoration:line-through;opacity:0.4}
.ai-meta{font-size:11px;color:var(--mu);margin-top:2px}
.chip{font-size:10px;font-weight:700;padding:3px 10px;border-radius:100px;flex-shrink:0;white-space:nowrap}
.ch-od{background:rgba(239,68,68,0.12);color:var(--rd);border:1px solid rgba(239,68,68,0.2)}
.ch-du{background:rgba(245,158,11,0.12);color:var(--yl);border:1px solid rgba(245,158,11,0.2)}
.ch-dn{background:rgba(34,197,94,0.12);color:var(--gn);border:1px solid rgba(34,197,94,0.2)}
.ch-ex{background:rgba(168,85,247,0.12);color:var(--pu);border:1px solid rgba(168,85,247,0.2)}

/* Stats */
.st-row{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:16px}
.st-m{background:rgba(255,255,255,0.02);border:1px solid var(--nb);border-radius:10px;padding:12px;text-align:center}
.st-v{font-family:var(--fd);font-size:20px;font-weight:800}.st-l{font-size:10px;color:var(--mu);margin-top:2px}

/* Notes item */
.ni{display:flex;align-items:center;gap:12px;padding:12px 6px;border-bottom:1px solid rgba(26,107,255,0.06);cursor:pointer;border-radius:6px;margin:0 -6px;text-decoration:none;color:var(--wh)}
.ni:hover{background:rgba(26,107,255,0.04)}.ni:last-child{border-bottom:none}
.ni-ic{width:34px;height:34px;border-radius:8px;background:rgba(26,107,255,0.1);display:flex;align-items:center;justify-content:center;font-size:14px;flex-shrink:0}

/* Classes grid */
.cls-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px;padding:0 36px 36px}
.cls-card{background:var(--nc);border:1px solid var(--nb);border-radius:16px;padding:24px;cursor:pointer;transition:all 0.3s;position:relative;overflow:hidden;text-decoration:none;color:var(--wh);display:block}
.cls-card:hover{border-color:rgba(26,107,255,0.35);transform:translateY(-2px)}
.cls-code{font-family:var(--fd);font-size:18px;font-weight:800;margin-bottom:4px}
.cls-name{font-size:13px;color:var(--mu);margin-bottom:12px;line-height:1.4}
.cls-meta{display:flex;gap:16px;font-size:11px;color:var(--mu)}

/* Class detail tabs */
.cd-hdr{padding:28px 36px;position:relative;overflow:hidden}
.cd-code{font-family:var(--fd);font-size:32px;font-weight:800;letter-spacing:-1px}
.cd-name{font-size:15px;color:var(--mu);margin-top:4px}
.cd-info{display:flex;gap:20px;margin-top:12px;font-size:12px;color:var(--mu);flex-wrap:wrap}
.cd-tabs{display:flex;gap:4px;padding:0 36px;border-bottom:1px solid var(--nb)}
.cd-tab{padding:10px 16px;font-size:13px;font-weight:500;color:var(--mu);cursor:pointer;border-bottom:2px solid transparent;transition:all 0.2s;background:none;border-top:none;border-left:none;border-right:none;font-family:var(--fb)}
.cd-tab:hover{color:var(--wh)}.cd-tab.active{color:var(--wh);border-bottom-color:var(--blue)}
.cd-body{padding:24px 36px 36px}

/* Note viewer */
.nv-sum{background:rgba(26,107,255,0.04);border:1px solid rgba(26,107,255,0.15);border-radius:14px;overflow:hidden}
.nv-sum-hdr{background:var(--blue);padding:10px 16px;display:flex;align-items:center;gap:8px;font-size:13px;font-weight:600}
.nv-sum-body{padding:20px;font-size:14px;line-height:1.8;color:rgba(180,200,255,0.85)}
.nv-sum-body h2{font-family:var(--fd);font-size:16px;font-weight:700;color:var(--wh);margin:20px 0 8px;padding-bottom:6px;border-bottom:1px solid var(--nb)}
.nv-sum-body h2:first-child{margin-top:0}
.nv-sum-body table{width:100%;border-collapse:collapse;margin:12px 0;font-size:13px}
.nv-sum-body th{text-align:left;padding:8px 12px;background:rgba(26,107,255,0.08);border:1px solid var(--nb);font-weight:600;color:var(--bbr);font-size:11px;text-transform:uppercase}
.nv-sum-body td{padding:8px 12px;border:1px solid var(--nb);color:rgba(180,200,255,0.7)}
.nv-sum-body ul{margin:8px 0;padding-left:20px}.nv-sum-body li{margin-bottom:4px}
.nv-kp{background:rgba(255,255,255,0.02);border:1px solid var(--nb);border-radius:10px;padding:12px 16px;margin-bottom:8px;display:flex;align-items:flex-start;gap:10px}
.nv-kp-num{width:22px;height:22px;border-radius:50%;background:rgba(26,107,255,0.12);display:flex;align-items:center;justify-content:center;font-size:10px;font-weight:700;color:var(--bbr);flex-shrink:0;margin-top:1px}
.nv-transcript{background:rgba(255,255,255,0.02);border:1px solid var(--nb);border-radius:14px;padding:20px;font-size:13px;color:rgba(180,200,255,0.6);line-height:1.8;max-height:500px;overflow-y:auto;white-space:pre-wrap}

/* Flashcards */
.fc-card{width:100%;min-height:220px;border-radius:20px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px;cursor:pointer;transition:all 0.3s;text-align:center;gap:14px}
.fc-q{background:rgba(26,107,255,0.06);border:1px solid rgba(26,107,255,0.2)}.fc-q:hover{border-color:rgba(26,107,255,0.4)}
.fc-a{background:rgba(34,197,94,0.06);border:1px solid rgba(34,197,94,0.2)}
.fc-btns{display:flex;gap:10px;margin-top:16px}
.fc-btn{flex:1;padding:12px;border-radius:12px;text-align:center;cursor:pointer;font-size:12px;font-weight:600;border:none;font-family:var(--fb);transition:all 0.2s}

/* Quiz */
.qz-opt{padding:14px 18px;border:1px solid var(--nb);border-radius:12px;cursor:pointer;margin-bottom:8px;font-size:14px;transition:all 0.2s;display:flex;align-items:center;gap:12px;background:rgba(255,255,255,0.02)}
.qz-opt:hover{border-color:rgba(26,107,255,0.4);background:rgba(26,107,255,0.04)}
.qz-opt.correct{border-color:var(--gn);background:rgba(34,197,94,0.1)}
.qz-opt.wrong{border-color:var(--rd);background:rgba(239,68,68,0.1)}
.qz-letter{width:28px;height:28px;border-radius:8px;background:rgba(255,255,255,0.05);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;flex-shrink:0}
.qz-prog{width:100%;height:6px;background:rgba(255,255,255,0.06);border-radius:6px;overflow:hidden;margin:12px 0}
.qz-prog-bar{height:100%;background:var(--blue);border-radius:6px;transition:width 0.3s}

/* Recording */
.rec-circle{width:140px;height:140px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all 0.3s;margin:0 auto}
.rec-idle{background:rgba(239,68,68,0.1);border:2px solid rgba(239,68,68,0.3)}.rec-idle:hover{background:rgba(239,68,68,0.2)}
.rec-active{background:rgba(239,68,68,0.2);border:2px solid var(--rd);animation:recPulse 1.5s ease-in-out infinite}
@keyframes recPulse{0%,100%{box-shadow:0 0 0 0 rgba(239,68,68,0.3)}50%{box-shadow:0 0 0 20px rgba(239,68,68,0)}}
.rec-dot{width:48px;height:48px;border-radius:50%;background:var(--rd);transition:all 0.3s}
.rec-active .rec-dot{border-radius:8px;width:32px;height:32px}
.rec-timer{font-family:var(--fd);font-size:32px;font-weight:800;text-align:center;margin:20px 0}
.rec-status{text-align:center;font-size:14px;color:var(--mu)}

@media(max-width:900px){.grid{grid-template-columns:1fr}.sb{width:56px}.sb-i{width:38px;height:38px}.ct{margin-left:56px}.hdr,.ds,.grid,.cls-grid,.cd-hdr,.cd-tabs,.cd-body{padding-left:20px;padding-right:20px}}
@media(max-width:600px){.st-row{grid-template-columns:repeat(2,1fr)}.cls-grid{grid-template-columns:1fr}}