/* ====== Математика с Залиной — стили платформы ====== */
:root{
  --teal:#0F766E; --teal-d:#0B5A54; --navy:#16324F; --navy-2:#1E4364;
  --bg:#F7FAF9; --mint:#D9F2EC; --mint-2:#E8F7F1; --mint-3:#EAF3F0;
  --line:#E3EDEA; --line-2:#B5DED4;
  --ink:#1F2933; --muted:#5C6B73; --muted-2:#8AA39D; --ph:#9DB1AC;
  --ok:#5BA882; --ok-d:#2C5A43; --ok-bg:#E7F4EE;
  --gold:#E2A93B; --gold-d:#7D5A12; --gold-bg:#FBF1DC;
  --err:#9A4A38; --err-bg:#FBEAE5; --err-line:#E07856;
  --r:14px; --r-lg:20px;
  --fz: Manrope, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);font-family:var(--fz);color:var(--ink);-webkit-font-smoothing:antialiased}
input::placeholder,textarea::placeholder{color:var(--ph)}
::-webkit-scrollbar{width:9px;height:9px}::-webkit-scrollbar-thumb{background:#D2DEDA;border-radius:99px}
a{color:inherit}
button{font-family:var(--fz)}
.hidden{display:none !important}

/* toast */
.toast{position:fixed;top:18px;left:50%;transform:translateX(-50%);z-index:2000;background:var(--navy);color:#fff;
  padding:12px 20px;border-radius:12px;font-weight:600;font-size:14px;box-shadow:0 12px 30px rgba(22,50,79,.3)}

/* ---------- AUTH ---------- */
.auth-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;
  background:radial-gradient(circle at 50% 0%, var(--mint-2), var(--bg) 60%)}
.auth-card{width:100%;max-width:400px}
.auth-logo{width:64px;height:64px;border-radius:50%;object-fit:cover;box-shadow:0 8px 22px rgba(15,118,110,.2)}
.brand-title{font-weight:800;font-size:20px;color:var(--navy);margin-top:12px}
.brand-eyebrow{font-weight:600;font-size:12px;color:var(--teal);letter-spacing:1.5px;text-transform:uppercase}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:26px;box-shadow:0 18px 50px rgba(22,50,79,.1)}
.field label{font-weight:600;font-size:12px;color:var(--muted)}
.field input,.field textarea,.field select{width:100%;margin-top:6px;border:1.5px solid var(--line);border-radius:12px;
  padding:13px 14px;font-weight:600;font-size:15px;outline:none;color:var(--ink);background:#fff}
.field textarea{resize:vertical;min-height:70px;font-weight:500}
.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--teal)}
.col{display:flex;flex-direction:column;gap:12px}
.btn{border:none;border-radius:12px;padding:14px;font-weight:700;font-size:15px;cursor:pointer}
.btn-primary{background:var(--teal);color:#F7FAF9}
.btn-primary:hover{background:var(--teal-d)}
.btn-ghost{border:1px solid var(--line);background:#fff;color:var(--muted);border-radius:10px;padding:9px 15px;font-weight:600;font-size:13px;cursor:pointer}
.btn-ghost:hover{border-color:var(--line-2)}
.err-box{background:var(--err-bg);color:var(--err);border-radius:10px;padding:10px 12px;font-weight:600;font-size:13px}
.demo-box{margin-top:16px;background:var(--bg);border:1px dashed var(--line-2);border-radius:12px;padding:13px 14px}
.demo-box .t{font-weight:700;font-size:11px;color:var(--teal-d);text-transform:uppercase;letter-spacing:.5px}
.demo-btn{text-align:left;border:1px solid var(--line);background:#fff;border-radius:9px;padding:9px 11px;cursor:pointer;font-weight:600;font-size:12px;color:var(--ink)}
.demo-btn:hover{border-color:var(--line-2)}
.muted-link{font-weight:600;font-size:13px;color:var(--muted);text-decoration:none}

/* ---------- HEADER ---------- */
.appbar{position:sticky;top:0;z-index:30;background:rgba(247,250,249,.9);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);padding:13px clamp(16px,4vw,32px);display:flex;align-items:center;gap:14px}
.appbar img{width:38px;height:38px;border-radius:50%;object-fit:cover;flex:none}
.appbar .who{flex:1;min-width:0}
.appbar .who .n{font-weight:800;font-size:15px;color:var(--navy)}
.appbar .who .s{font-weight:600;font-size:12px;color:var(--muted-2)}

/* ---------- STUDENT ---------- */
.wrap-880{max-width:880px;margin:0 auto;padding:clamp(18px,3vw,30px) clamp(16px,4vw,32px)}
.progress-card{background:linear-gradient(155deg,var(--teal),var(--teal-d));border-radius:var(--r-lg);padding:24px;color:#D9F2EC}
.progress-card .row{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px}
.progress-card .lab{font-weight:600;font-size:12px;color:rgba(217,242,236,.8);text-transform:uppercase;letter-spacing:1px}
.progress-card .big{font-weight:800;font-size:32px;color:#fff;margin-top:4px}
.progress-card .stars{font-weight:800;font-size:24px;color:var(--gold)}
.bar{height:10px;border-radius:99px;background:rgba(217,242,236,.2);margin-top:16px;overflow:hidden}
.bar i{display:block;height:100%;border-radius:99px;background:var(--gold)}
.mod{margin-bottom:20px}
.mod-head{display:flex;align-items:center;gap:9px;margin-bottom:10px;flex-wrap:wrap}
.mod-head .t{font-weight:800;font-size:14px;color:var(--navy)}
.mod-head .m{font-weight:600;font-size:12px;color:var(--muted-2)}
.lesson-btn{text-align:left;display:flex;align-items:center;gap:14px;background:#fff;border:1px solid var(--line);
  border-radius:var(--r);padding:15px 16px;cursor:pointer;width:100%;margin-bottom:10px}
.lesson-btn:hover{border-color:var(--line-2)}
.lesson-ico{width:42px;height:42px;border-radius:11px;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;flex:none}
.lesson-btn .ttl{display:block;font-weight:700;font-size:15px;color:var(--ink)}
.lesson-btn .sub{display:block;font-weight:600;font-size:12px;color:var(--muted-2)}
.pill{font-weight:700;font-size:11px;padding:5px 11px;border-radius:99px;white-space:nowrap}
.empty{background:#fff;border:1px dashed var(--line-2);border-radius:var(--r);padding:30px;text-align:center;font-weight:600;font-size:14px;color:var(--muted-2)}

/* lesson view */
.back-row{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.lesson-title{font-weight:800;font-size:22px;color:var(--navy)}
.video-wrap{position:relative;width:100%;aspect-ratio:16/9;border-radius:var(--r);overflow:hidden;background:#0b1722;border:1px solid var(--line)}
.video-wrap iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.no-video{background:var(--mint-3);border:1px dashed var(--line-2);border-radius:var(--r);padding:22px;text-align:center;color:var(--muted);font-weight:600}
.note{background:#fff;border:1px solid var(--line);border-left:4px solid var(--teal);border-radius:var(--r);padding:14px 16px;font-weight:500;color:var(--ink);line-height:1.5}
.task{background:#fff;border:1.5px solid var(--line-2);border-radius:var(--r);padding:16px;margin-top:12px}
.task .head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:10px}
.task .num{font-weight:800;font-size:13px;color:var(--teal-d)}
.task .att{font-weight:600;font-size:12px;color:var(--muted-2)}
.task .prompt{font-weight:700;font-size:18px;color:var(--ink);margin-bottom:10px}
.task input{width:100%;border:1.5px solid var(--line);border-radius:12px;padding:12px 14px;font-weight:700;font-size:16px;outline:none}
.task input:focus{border-color:var(--teal)}
.task .check{margin-top:10px}
.hint{margin-top:10px;border-radius:10px;padding:10px 12px;font-weight:600;font-size:14px;line-height:1.45}
.hint.h1{background:var(--gold-bg);color:var(--gold-d)}
.hint.h2{background:#EAF3F0;color:var(--teal-d)}
.hint.razbor{background:var(--navy);color:#E2F0FF}
.hint.ok{background:var(--ok-bg);color:var(--ok-d)}
.hint.empty{background:var(--err-bg);color:var(--err)}

/* ---------- TEACHER ---------- */
.t-shell{display:flex;min-height:100vh}
.t-side{width:230px;flex:none;background:linear-gradient(180deg,var(--navy),#0e2740);color:#D9F2EC;
  display:flex;flex-direction:column;padding:18px 14px;position:sticky;top:0;height:100vh}
.t-side .brand{display:flex;align-items:center;gap:10px;padding:6px 8px 16px}
.t-side .brand img{width:34px;height:34px;border-radius:50%;object-fit:cover}
.t-side .brand .n{font-weight:800;font-size:14px;color:#fff;line-height:1.15}
.t-side .brand .r{font-weight:600;font-size:11px;color:rgba(217,242,236,.7)}
.t-nav{display:flex;flex-direction:column;gap:3px;margin-top:6px}
.t-nav button{display:flex;align-items:center;gap:10px;text-align:left;border:none;background:transparent;color:rgba(217,242,236,.72);
  border-radius:10px;padding:11px 12px;font-weight:600;font-size:14px;cursor:pointer;border-left:3px solid transparent}
.t-nav button.active{background:rgba(217,242,236,.14);color:#fff;border-left-color:#34D3B0}
.t-nav .sec{font-weight:700;font-size:10px;letter-spacing:1px;text-transform:uppercase;color:rgba(217,242,236,.45);padding:14px 12px 4px}
.t-side .foot{margin-top:auto;display:flex;flex-direction:column;gap:8px}
.t-main{flex:1;min-width:0;display:flex;flex-direction:column}
.t-head{padding:18px clamp(16px,3vw,30px);border-bottom:1px solid var(--line);background:#fff;
  display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.t-head .ttl{font-weight:800;font-size:20px;color:var(--navy)}
.t-head .sub{font-weight:600;font-size:13px;color:var(--muted-2)}
.t-head .sp{flex:1}
.t-body{padding:clamp(16px,3vw,28px);max-width:1000px;width:100%}
.t-add{background:var(--teal);color:#fff;border:none;border-radius:11px;padding:11px 16px;font-weight:700;font-size:14px;cursor:pointer}
.t-add:hover{background:var(--teal-d)}

.panel{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;margin-bottom:18px}
.panel .ph{padding:14px 16px;border-bottom:1px solid var(--line);font-weight:800;font-size:14px;color:var(--navy)}
.lrow{display:flex;align-items:center;gap:14px;padding:13px 16px;border-bottom:1px solid var(--line)}
.lrow:last-child{border-bottom:none}
.lrow .n{width:30px;height:30px;border-radius:8px;background:var(--mint);color:var(--teal-d);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:13px;flex:none}
.lrow .info{flex:1;min-width:0}
.lrow .info .t{font-weight:700;font-size:14px;color:var(--ink)}
.lrow .info .s{font-weight:600;font-size:12px;color:var(--muted-2)}
.tag{font-weight:600;font-size:11px;padding:4px 9px;border-radius:99px;background:var(--mint-3);color:var(--teal-d);white-space:nowrap}
.tag.off{background:#F0F2F4;color:#9AA7AE}
.icon-btn{border:1px solid var(--line);background:#fff;border-radius:9px;padding:7px 10px;font-weight:600;font-size:12px;cursor:pointer;color:var(--muted)}
.icon-btn:hover{border-color:var(--line-2)}
.icon-btn.danger:hover{border-color:var(--err-line);color:var(--err)}

/* table */
.tbl{width:100%;border-collapse:collapse}
.tbl th{text-align:left;font-weight:700;font-size:11px;text-transform:uppercase;letter-spacing:.5px;color:var(--muted-2);padding:10px 14px;border-bottom:1px solid var(--line)}
.tbl td{padding:12px 14px;border-bottom:1px solid var(--line);font-weight:600;font-size:13px;color:var(--ink);vertical-align:middle}
.tbl tr:last-child td{border-bottom:none}
.ava{width:32px;height:32px;border-radius:50%;background:var(--mint);color:var(--teal-d);display:inline-flex;align-items:center;justify-content:center;font-weight:800;font-size:13px;margin-right:9px;vertical-align:middle}
.mini-bar{display:inline-block;width:90px;height:7px;border-radius:99px;background:var(--line);overflow:hidden;vertical-align:middle;margin-right:8px}
.mini-bar i{display:block;height:100%;background:var(--teal)}

/* modal */
.modal-back{position:fixed;inset:0;z-index:1000;background:rgba(22,50,79,.45);display:flex;align-items:flex-start;justify-content:center;padding:24px;overflow:auto}
.modal{background:#fff;border-radius:var(--r-lg);width:100%;max-width:600px;box-shadow:0 30px 80px rgba(22,50,79,.3);margin:auto}
.modal .mh{display:flex;align-items:center;justify-content:space-between;padding:18px 22px;border-bottom:1px solid var(--line)}
.modal .mh .t{font-weight:800;font-size:17px;color:var(--navy)}
.modal .mb{padding:20px 22px;display:flex;flex-direction:column;gap:14px;max-height:70vh;overflow:auto}
.modal .mf{padding:16px 22px;border-top:1px solid var(--line);display:flex;gap:10px;justify-content:flex-end}
.x{border:none;background:#F0F2F4;width:32px;height:32px;border-radius:9px;cursor:pointer;font-weight:700;color:var(--muted)}
.task-edit{border:1px solid var(--line);border-radius:12px;padding:14px;background:var(--bg)}
.task-edit .teh{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.task-edit .teh .t{font-weight:700;font-size:13px;color:var(--teal-d)}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.vk-ok{font-weight:600;font-size:12px;color:var(--ok-d)}
.vk-bad{font-weight:600;font-size:12px;color:var(--err)}
.cred{background:var(--ok-bg);border:1px solid #BFE3CF;border-radius:12px;padding:16px;font-weight:600;color:var(--ok-d)}
.cred b{font-size:18px;color:var(--navy)}
.dashed-add{border:1.5px dashed var(--line-2);background:#fff;color:var(--teal-d);border-radius:11px;padding:11px;font-weight:700;font-size:13px;cursor:pointer;width:100%}

@media (max-width:720px){
  .t-shell{display:block}
  .t-side{width:100%;height:auto;position:static;flex-direction:row;flex-wrap:wrap;align-items:center;gap:4px;padding:10px 12px}
  .t-side .brand{padding:6px 8px}
  .t-nav{flex-direction:row;flex-wrap:wrap;margin-top:0}
  .t-nav .sec{display:none}
  .t-nav button{border-left:none;border-bottom:3px solid transparent;padding:9px 10px;font-size:13px}
  .t-nav button.active{border-left:none;border-bottom-color:#34D3B0}
  .t-side .foot{flex-direction:row;margin-top:0;margin-left:auto}
  .grid2{grid-template-columns:1fr}
  .tbl th:nth-child(3),.tbl td:nth-child(3){display:none}
}

/* ---------- направления (tracks) ---------- */
.track-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}
.track-tab{font:inherit;font-weight:700;font-size:13px;padding:9px 14px;border-radius:999px;border:1px solid var(--line,#E3EDEA);background:#fff;color:var(--navy,#16324F);cursor:pointer;transition:.15s}
.track-tab:hover{border-color:var(--line-2,#B5DED4)}
.track-tab.active{background:var(--teal,#0F766E);color:#fff;border-color:var(--teal,#0F766E)}
.track-single{font-weight:800;color:var(--navy,#16324F);font-size:15px;margin-bottom:14px}
.track-pick{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:6px}
.track-chk{display:flex;align-items:center;gap:8px;font-weight:600;font-size:13.5px;color:var(--ink,#1F2933);background:var(--mint-3,#EAF3F0);border:1px solid var(--line,#E3EDEA);border-radius:10px;padding:9px 11px;cursor:pointer}
.track-chk input{width:16px;height:16px;accent-color:var(--teal,#0F766E)}
@media(max-width:520px){.track-pick{grid-template-columns:1fr}}

/* ---------- материалы и тренажёр ученика ---------- */
.mat-row{display:flex;gap:10px;flex-wrap:wrap}
.mat-btn{display:inline-flex;align-items:center;gap:7px;font-weight:700;font-size:13.5px;text-decoration:none;color:var(--teal-d,#0B5A54);background:var(--mint-2,#E8F7F1);border:1px solid var(--line-2,#B5DED4);border-radius:10px;padding:10px 16px}
.mat-btn:hover{background:var(--mint,#D9F2EC)}
.trainer-head{display:flex;align-items:center;gap:12px;font-weight:800;color:var(--navy,#16324F);font-size:14px;margin:14px 0 10px}
.trainer-bar{flex:1;height:8px;border-radius:6px;background:var(--mint,#D9F2EC);overflow:hidden}
.trainer-bar i{display:block;height:100%;background:var(--teal,#0F766E);transition:width .3s}
.result-card{margin-top:18px;background:#fff;border:1px solid var(--line,#E3EDEA);border-radius:20px;padding:30px 24px;text-align:center;box-shadow:0 14px 40px -26px rgba(16,50,79,.4)}
.res-emoji{font-size:44px}
.res-title{font-weight:800;color:var(--navy,#16324F);font-size:20px;margin-top:6px}
.res-big{font-size:40px;font-weight:800;color:var(--teal,#0F766E);margin-top:10px}
.res-sub{color:var(--muted,#5C6B73);font-weight:600;margin-top:2px}
.res-stats{display:flex;justify-content:center;gap:18px;margin-top:14px;font-weight:700;color:var(--navy,#16324F)}
.res-stats span{background:var(--mint-3,#EAF3F0);border:1px solid var(--line,#E3EDEA);border-radius:10px;padding:8px 14px;font-size:14px}
.res-actions{display:flex;gap:10px;justify-content:center;margin-top:20px;flex-wrap:wrap}