:root{
  --bg:#f5f7fb; --surface:#fff; --text:#14213d; --muted:#74809a; --line:#e8edf5;
  --blue:#2f74ff; --blue2:#eaf2ff; --green:#22b573; --green2:#e8f8f1;
  --amber:#f3aa22; --amber2:#fff6dd; --red:#e85b63; --red2:#fff0f1; --shadow:0 10px 30px rgba(23,39,74,.08);
}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%;background:var(--bg);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;color:var(--text)}
button,input,textarea{font:inherit}
button{cursor:pointer}
#app{min-height:100vh}
.shell{max-width:520px;margin:0 auto;min-height:100vh;background:var(--bg);position:relative;padding-bottom:92px}
.topbar{padding:22px 18px 10px;display:flex;align-items:center;justify-content:space-between;gap:12px;position:sticky;top:0;background:linear-gradient(var(--bg) 80%,rgba(245,247,251,0));z-index:4}
.title-wrap h1{margin:0;font-size:28px;line-height:1.08;letter-spacing:-.03em}.title-wrap p{margin:5px 0 0;color:var(--muted);font-size:14px}
.icon-btn{width:40px;height:40px;border:0;border-radius:14px;background:var(--surface);box-shadow:var(--shadow);font-size:20px;color:var(--text)}
.content{padding:6px 16px 24px}.day-tabs{display:flex;gap:8px;margin:6px 0 16px}.day-tab{border:0;background:#edf1f7;color:#66728c;border-radius:14px;padding:10px 13px;font-weight:700;font-size:13px}.day-tab.active{background:var(--blue2);color:var(--blue)}
.lesson-list{display:flex;flex-direction:column;gap:10px}.lesson-card{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:14px;box-shadow:0 4px 14px rgba(23,39,74,.035)}
.lesson-card.current{background:#eef5ff;border-color:#dceaff}.lesson-head{display:flex;gap:12px;align-items:center}.time{width:58px;color:#60708d;font-size:14px;font-weight:700}.subject{flex:1;font-weight:800;font-size:17px}.subject-emoji{font-size:24px;width:32px;text-align:center}.chev{color:#99a5ba;font-size:24px}.lesson-meta{margin:10px 0 0 70px;display:flex;gap:7px;flex-wrap:wrap}.pill{display:inline-flex;align-items:center;gap:6px;border-radius:999px;padding:7px 9px;font-size:12px;font-weight:700;background:#f0f3f8;color:#69758e}.pill.ok{background:var(--green2);color:#188a58}.pill.warn{background:var(--amber2);color:#aa7414}.pill.empty{background:#f2f4f8;color:#8b95a8}.pill.blue{background:var(--blue2);color:var(--blue)}
.bottom-nav{position:fixed;bottom:0;left:50%;transform:translateX(-50%);max-width:520px;width:100%;display:grid;grid-template-columns:repeat(3,1fr);background:rgba(255,255,255,.95);backdrop-filter:blur(14px);border-top:1px solid var(--line);padding:10px 16px calc(10px + env(safe-area-inset-bottom));z-index:10}.nav-btn{border:0;background:none;color:#8a95a9;padding:6px 0;font-size:12px;font-weight:700}.nav-btn span{display:block;font-size:22px;margin-bottom:3px}.nav-btn.active{color:var(--blue)}
.backbar{display:flex;align-items:center;gap:10px}.back{border:0;background:none;font-size:27px;padding:4px}.lesson-title{flex:1;text-align:center}.lesson-title h2{margin:0;font-size:18px}.lesson-title p{margin:3px 0 0;color:var(--muted);font-size:13px}.spacer40{width:40px}
.section-card{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:16px;margin-bottom:12px;box-shadow:0 4px 14px rgba(23,39,74,.035)}.section-head{display:flex;align-items:flex-start;gap:12px}.section-icon{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;background:var(--blue2);font-size:20px}.section-main{flex:1}.section-main h3{margin:1px 0 7px;font-size:16px}.section-text{font-size:15px;line-height:1.45;color:#33415c}.status-line{margin-top:9px;color:#21885e;font-size:12px;font-weight:700}.section-actions{display:flex;gap:8px;margin-top:13px}.secondary,.primary,.danger{border:0;border-radius:14px;padding:11px 13px;font-weight:800}.secondary{background:#eff3f8;color:#52627d}.primary{background:var(--blue);color:#fff}.danger{background:var(--red2);color:var(--red)}.full{width:100%}
.material-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:12px}.material{aspect-ratio:1.05;border-radius:14px;overflow:hidden;background:#edf1f6;position:relative;border:1px solid var(--line)}.material img{width:100%;height:100%;object-fit:cover}.material .label{position:absolute;left:6px;bottom:6px;background:rgba(18,28,47,.72);color:#fff;font-size:10px;border-radius:8px;padding:4px 6px}.add-material{display:grid;place-items:center;color:var(--blue);font-weight:800;border:1px dashed #aac7ff;background:#f8fbff}
.sheet-wrap{position:fixed;inset:0;background:rgba(20,33,61,.28);display:flex;align-items:flex-end;justify-content:center;z-index:30}.sheet{width:min(520px,100%);max-height:92vh;overflow:auto;background:var(--surface);border-radius:26px 26px 0 0;padding:10px 18px calc(24px + env(safe-area-inset-bottom));box-shadow:0 -18px 50px rgba(20,33,61,.2)}.grab{width:42px;height:5px;background:#d8deea;border-radius:99px;margin:2px auto 14px}.sheet h2{margin:0 0 6px;font-size:22px}.sheet .sub{margin:0 0 18px;color:var(--muted);font-size:14px}.field{margin:15px 0}.field label{display:block;font-weight:800;margin-bottom:8px}.text-input,.text-area{width:100%;border:1px solid #dfe6f0;border-radius:14px;background:#f8faff;padding:13px 14px;outline:none;color:var(--text)}.text-area{min-height:86px;resize:vertical}.text-input:focus,.text-area:focus{border-color:#9abaff;box-shadow:0 0 0 3px rgba(47,116,255,.08)}.chips{display:flex;gap:8px;flex-wrap:wrap}.chip{border:1px solid #e0e6f0;background:#f4f6f9;color:#4f5c75;padding:9px 11px;border-radius:999px;font-weight:700;font-size:13px}.chip.selected{background:var(--blue);border-color:var(--blue);color:#fff}.photo-drop{border:1.5px dashed #a9c6ff;border-radius:16px;background:#f8fbff;padding:16px;text-align:center;color:var(--blue);font-weight:800}.photo-drop input{display:none}.preview{display:flex;gap:8px;overflow:auto;margin-top:10px}.preview img{width:86px;height:86px;object-fit:cover;border-radius:13px;border:1px solid var(--line)}
.notice{padding:12px 14px;border-radius:14px;background:var(--green2);color:#197e55;font-weight:700;font-size:13px;margin-bottom:12px}.soft{background:#eef5ff;color:#2a64c9}.empty-state{padding:30px 18px;text-align:center;color:var(--muted)}.empty-state .big{font-size:46px;margin-bottom:8px}.toast{position:fixed;left:50%;bottom:100px;transform:translateX(-50%);background:#14213d;color:#fff;padding:11px 14px;border-radius:999px;font-size:13px;font-weight:700;z-index:50;box-shadow:var(--shadow);animation:fade .2s ease}.profile-card{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:16px;margin-bottom:12px}.muted{color:var(--muted)}
@keyframes fade{from{opacity:0;transform:translate(-50%,8px)}to{opacity:1;transform:translate(-50%,0)}}
@media (min-width:760px){body{padding:24px}.shell{min-height:calc(100vh - 48px);border-radius:30px;overflow:hidden;box-shadow:0 30px 90px rgba(23,39,74,.16)}.bottom-nav{bottom:24px;border-radius:0 0 30px 30px;overflow:hidden}}
.week-tabs{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}
.week-tabs .day-tab{padding:10px 6px}
.lesson-number{width:34px;height:34px;border-radius:12px;background:#f0f4fa;display:grid;place-items:center;color:#4f607e;font-size:14px;font-weight:900;flex:0 0 auto}
.subject-block{flex:1;min-width:0}.subject-block .subject{white-space:normal}.room{margin-top:3px;color:var(--muted);font-size:12px;font-weight:650}
.lesson-meta{margin-left:46px}
.subject-picker{display:flex;flex-direction:column;gap:8px}.picker-row{width:100%;border:1px solid var(--line);background:#f8faff;border-radius:14px;padding:13px 14px;display:flex;align-items:center;justify-content:space-between;color:var(--text);text-align:left}.picker-row span:first-child{display:flex;flex-direction:column;gap:3px}.picker-row small{color:var(--muted);font-size:12px}
.week-nav{display:grid;grid-template-columns:42px 1fr 42px;align-items:center;gap:8px;margin:4px 0 10px}.week-arrow,.week-label{border:0;background:var(--surface);box-shadow:0 4px 14px rgba(23,39,74,.045);color:var(--text)}.week-arrow{height:40px;border-radius:13px;font-size:25px}.week-label{height:40px;border-radius:13px;font-weight:850;font-size:14px}.date-tabs{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;margin-bottom:8px}.date-tab{border:0;background:#edf1f7;color:#69758d;border-radius:15px;padding:8px 4px;display:flex;flex-direction:column;align-items:center;gap:3px}.date-tab span{font-size:11px;font-weight:800}.date-tab b{font-size:17px}.date-tab.active{background:var(--blue);color:white}.history-hint{text-align:center;color:#95a0b3;font-size:11px;margin:0 0 13px}.pill.group{background:#f2ecff;color:#7250bd}.group-switch{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:14px;margin-bottom:12px}.group-switch-title{font-size:12px;color:var(--muted);font-weight:800;margin-bottom:9px}.my-group-card{background:#f2ecff;border:1px solid #e3d8ff;border-radius:18px;padding:13px 14px;margin-bottom:12px;display:flex;align-items:center;justify-content:space-between;gap:12px}.my-group-card b{display:block;color:#5f3ead;font-size:14px}.my-group-card span{display:block;color:#776a94;font-size:12px;margin-top:3px}.my-group-card button{border:0;background:#fff;border-radius:11px;padding:8px 10px;color:#7250bd;font-weight:800}.group-choice-list{display:grid;gap:10px;margin:14px 0}.group-choice{border:1px solid var(--line);background:#f7f9fc;border-radius:17px;padding:15px;text-align:left;display:flex;align-items:center;justify-content:space-between;gap:12px}.group-choice strong{font-size:16px}.group-choice small{display:block;color:var(--muted);margin-top:3px}.group-choice .room-badge{background:var(--blue2);color:var(--blue);border-radius:999px;padding:8px 10px;font-size:13px;font-weight:900;white-space:nowrap}.group-tabs{display:grid;grid-template-columns:1fr 1fr;gap:8px}.group-tab{border:1px solid var(--line);background:#f6f8fc;color:var(--text);border-radius:14px;padding:10px;text-align:left}.group-tab b{display:block;font-size:13px}.group-tab span{display:block;color:var(--muted);font-size:11px;margin-top:3px}.group-tab.active{background:var(--blue2);border-color:#bad1ff;color:var(--blue)}.pref-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 0;border-top:1px solid var(--line)}.pref-row:first-of-type{margin-top:10px}.pref-row>div{display:flex;flex-direction:column;gap:3px}.pref-row small{color:var(--muted);font-size:11px}.pref-row select{border:1px solid var(--line);background:#f6f8fc;border-radius:12px;padding:9px;color:var(--text);font-weight:700}.history-row small{white-space:normal;line-height:1.35}


/* Confirmations */
.confirmers-box{margin-top:10px;border:1px solid #e5ebf4;background:#f8faff;border-radius:14px;padding:10px 11px;display:flex;align-items:center;gap:9px;width:100%;text-align:left;color:var(--text)}
.confirmers-avatars{display:flex;align-items:center;flex:0 0 auto}.conf-avatar{width:27px;height:27px;border-radius:50%;display:grid;place-items:center;background:#e6efff;color:#2f64bd;font-size:11px;font-weight:900;border:2px solid white;margin-left:-5px}.conf-avatar:first-child{margin-left:0}.conf-avatar.more{background:#eef1f6;color:#6d7890}
.confirmers-copy{min-width:0;display:flex;flex-direction:column;gap:2px}.confirmers-copy b{font-size:12px;color:#207957}.confirmers-copy span{font-size:12px;color:#66728a;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:260px}
.secondary.confirmed{background:var(--green2);color:#188a58;cursor:default}.secondary:disabled{opacity:1}.confirm-list{display:grid;gap:8px;margin:13px 0 18px}.confirm-person{display:flex;align-items:center;gap:11px;padding:10px 11px;border:1px solid var(--line);border-radius:14px;background:#f8faff}.confirm-person .conf-avatar{margin:0;width:34px;height:34px;font-size:13px}.confirm-person b{font-size:14px}.confirm-person small{display:block;color:var(--muted);font-size:11px;margin-top:2px}.you-badge{margin-left:auto;background:var(--green2);color:#188a58;padding:5px 8px;border-radius:999px;font-size:11px;font-weight:850}

/* Auth / onboarding */
.auth-shell{max-width:520px;margin:0 auto;min-height:100vh;background:linear-gradient(180deg,#f7faff 0%,#f5f7fb 55%,#eef4ff 100%);display:flex;flex-direction:column;padding:24px 18px calc(26px + env(safe-area-inset-bottom))}
.auth-spacer{flex:1;min-height:24px}.auth-brand{text-align:center;padding:32px 12px 24px}.brand-mark{width:76px;height:76px;border-radius:24px;background:linear-gradient(145deg,#2f74ff,#65a0ff);display:grid;place-items:center;margin:0 auto 18px;color:white;font-size:38px;box-shadow:0 18px 40px rgba(47,116,255,.24)}.auth-brand h1{margin:0;font-size:30px;letter-spacing:-.04em}.auth-brand p{margin:9px auto 0;max-width:330px;color:var(--muted);line-height:1.45;font-size:15px}
.auth-card{background:rgba(255,255,255,.96);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:26px;padding:18px}.auth-tabs{display:grid;grid-template-columns:1fr 1fr;background:#f0f3f8;padding:4px;border-radius:15px;margin-bottom:18px}.auth-tab{border:0;background:transparent;border-radius:12px;padding:10px;font-weight:850;color:#758198}.auth-tab.active{background:white;color:var(--text);box-shadow:0 3px 9px rgba(23,39,74,.08)}
.auth-card h2{font-size:22px;margin:0 0 5px}.auth-note{font-size:13px;line-height:1.45;color:var(--muted);margin:0 0 16px}.auth-help{margin-top:13px;text-align:center;color:var(--muted);font-size:12px;line-height:1.45}.auth-help b{color:#53617a}.auth-error{display:none;background:var(--red2);color:var(--red);border-radius:13px;padding:10px 12px;margin:0 0 12px;font-size:13px;font-weight:750}.auth-error.show{display:block}.pin-input{letter-spacing:.35em;font-size:20px;font-weight:900;text-align:center}.auth-back{border:0;background:none;color:var(--blue);font-weight:800;padding:0;margin-bottom:12px}.found-class{background:var(--green2);border:1px solid #d3f0e3;border-radius:17px;padding:13px 14px;margin:12px 0 18px}.found-class b{display:block;color:#187e56}.found-class span{font-size:12px;color:#53806e}.onboarding-groups{display:grid;gap:10px;margin:12px 0 18px}.onboarding-group{background:#f8faff;border:1px solid var(--line);border-radius:16px;padding:13px}.onboarding-group b{font-size:14px}.onboarding-group small{display:block;color:var(--muted);margin:3px 0 9px}.onboarding-group select{width:100%;border:1px solid #dfe6f0;background:white;border-radius:12px;padding:10px;color:var(--text);font-weight:700}.logout-row{display:flex;gap:8px}.logout-row button{flex:1}