/* E4E — main.css
   Base, variables, layout, header, sidebar, home dashboard. */

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#f4f6fb; --bg-soft:#eef1f7; --card:#ffffff; --text:#1b2340;
  --muted:#64748b; --line:#e2e8f0;
  --brand:#1e3a8a; --brand-2:#3b82f6; --brand-soft:#dbeafe;
  --ok:#16a34a; --ok-soft:#dcfce7; --warn:#d97706; --warn-soft:#fef3c7;
  --bad:#dc2626; --bad-soft:#fee2e2; --accent:#0d9488;
  --radius:14px; --radius-s:9px;
  --shadow:0 1px 2px rgba(16,24,40,.06),0 4px 14px rgba(16,24,40,.07);
  --shadow-lg:0 8px 30px rgba(30,58,138,.14);
  --font:"Segoe UI",system-ui,-apple-system,Roboto,"Helvetica Neue",Arial,sans-serif;
}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}
a{color:var(--brand-2);text-decoration:none}
a:hover{text-decoration:underline}
button{font-family:inherit;cursor:pointer}
:focus-visible{outline:3px solid var(--brand-2);outline-offset:2px;border-radius:6px}
.wrap{max-width:1180px;margin:0 auto;padding:0 18px}

/* ---------- Header ---------- */
.topbar{position:sticky;top:0;z-index:60;background:var(--card);border-bottom:1px solid var(--line)}
.topbar-in{display:flex;align-items:center;gap:14px;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.05rem;color:var(--brand);white-space:nowrap}
.logo-mark{width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;display:grid;place-items:center;font-weight:800}
.nav{display:flex;gap:4px;margin-inline-start:8px}
.nav a{padding:8px 13px;border-radius:9px;color:var(--muted);font-weight:600;font-size:.93rem}
.nav a:hover{background:var(--bg-soft);text-decoration:none;color:var(--text)}
.nav a.active{background:var(--brand-soft);color:var(--brand)}
.topbar-sp{flex:1}
.searchbox{position:relative}
.searchbox input{width:230px;max-width:38vw;padding:9px 12px 9px 36px;border:1.5px solid var(--line);border-radius:10px;background:var(--bg);color:var(--text);font-size:.9rem}
.searchbox .s-ico{position:absolute;inset-inline-start:11px;top:50%;transform:translateY(-50%);color:var(--muted)}
.search-results{position:absolute;top:44px;inset-inline-end:0;width:330px;max-height:380px;overflow:auto;background:var(--card);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow-lg);display:none;z-index:80}
.search-results.open{display:block}
.search-results a{display:block;padding:10px 14px;border-bottom:1px solid var(--line);color:var(--text)}
.search-results a:hover{background:var(--bg-soft);text-decoration:none}
.search-results small{color:var(--muted)}
.icon-btn{border:1px solid var(--line);background:var(--card);color:var(--text);border-radius:10px;min-width:42px;min-height:42px;padding:8px 10px;font-size:1.05rem;display:inline-grid;place-items:center}
.icon-btn:hover{background:var(--bg-soft)}
.hamburger{display:none}

/* ---------- Layout with sidebar ---------- */
.layout{display:flex;gap:22px;align-items:flex-start;padding:22px 0 60px}
.sidebar{width:272px;flex-shrink:0;position:sticky;top:86px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px;max-height:calc(100vh - 110px);overflow:auto}
.sidebar h3{font-size:.82rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:4px 6px 10px}
.side-lesson{display:flex;gap:10px;align-items:center;width:100%;text-align:start;background:none;border:0;border-radius:10px;padding:9px 10px;color:var(--text);font-size:.9rem}
.side-lesson:hover{background:var(--bg-soft)}
.side-lesson .dot{width:24px;height:24px;border-radius:50%;display:grid;place-items:center;font-size:.75rem;font-weight:700;border:2px solid var(--line);color:var(--muted);flex-shrink:0}
.side-lesson.done .dot{background:var(--ok);border-color:var(--ok);color:#fff}
.side-lesson.current{background:var(--brand-soft)}
.side-lesson.current .dot{border-color:var(--brand);color:var(--brand)}
.side-lesson .t{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
main.content{flex:1;min-width:0}

/* ---------- Hero / dashboard ---------- */
.hero{background:linear-gradient(120deg,#1e3a8a,#3b82f6 60%,#0d9488);color:#fff;border-radius:18px;padding:28px;box-shadow:var(--shadow-lg);margin-bottom:20px;position:relative;overflow:hidden}
.hero h1{font-size:1.6rem;margin-bottom:6px}
.hero p{opacity:.92;max-width:60ch}
.hero-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:16px}
.btn{display:inline-flex;align-items:center;gap:8px;border:0;border-radius:11px;padding:12px 18px;font-weight:700;font-size:.95rem;min-height:46px}
.btn-pri{background:#fff;color:var(--brand)}
.btn-pri:hover{background:#eef4ff}
.btn-brand{background:var(--brand);color:#fff}
.btn-brand:hover{background:#172f70}
.btn-ghost{background:rgba(255,255,255,.16);color:#fff;border:1px solid rgba(255,255,255,.4)}
.btn-line{background:var(--card);border:1.5px solid var(--line);color:var(--text)}
.btn-line:hover{border-color:var(--brand-2)}
.btn-ok{background:var(--ok);color:#fff}
.btn-bad{background:var(--bad);color:#fff}
.btn-sm{padding:8px 12px;min-height:38px;font-size:.85rem;border-radius:9px}
.btn:disabled{opacity:.55;cursor:not-allowed}
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:20px}
.stat-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:15px;box-shadow:var(--shadow)}
.stat-card .v{font-size:1.45rem;font-weight:800}
.stat-card .l{font-size:.82rem;color:var(--muted)}
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;margin-bottom:18px}
.panel h2{font-size:1.15rem;margin-bottom:4px}
.panel .sub{color:var(--muted);font-size:.9rem;margin-bottom:12px}
.section-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:22px 0 12px}
.section-head h2{font-size:1.2rem}
.pill{display:inline-flex;align-items:center;gap:6px;font-size:.78rem;font-weight:700;padding:4px 11px;border-radius:999px;background:var(--bg-soft);color:var(--muted)}
.pill.green{background:var(--ok-soft);color:var(--ok)}
.pill.blue{background:var(--brand-soft);color:var(--brand)}
.pill.orange{background:var(--warn-soft);color:var(--warn)}
.pill.red{background:var(--bad-soft);color:var(--bad)}

/* ---------- Lesson cards ---------- */
.lesson-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(255px,1fr));gap:14px}
.lesson-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:0;overflow:hidden;display:flex;flex-direction:column;transition:transform .15s ease,box-shadow .15s ease;text-align:start;color:var(--text);border-width:1px;font-size:1rem;width:100%}
button.lesson-card{cursor:pointer}
.lesson-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);text-decoration:none}
.lesson-card .band{height:8px;background:linear-gradient(90deg,var(--brand),var(--accent))}
.lesson-card.done .band{background:var(--ok)}
.lesson-card.review .band{background:var(--warn)}
.lesson-card .body{padding:15px}
.lesson-card .num{font-size:.76rem;font-weight:800;color:var(--brand-2);text-transform:uppercase;letter-spacing:.05em}
.lesson-card h3{font-size:1.02rem;margin:3px 0}
.lesson-card .topic{font-size:.86rem;color:var(--muted);margin-bottom:10px}
.progress{height:8px;background:var(--bg-soft);border-radius:99px;overflow:hidden}
.progress > span{display:block;height:100%;background:linear-gradient(90deg,var(--brand-2),var(--accent));border-radius:99px;transition:width .5s ease}
.lesson-meta{display:flex;justify-content:space-between;align-items:center;margin-top:9px;font-size:.8rem;color:var(--muted)}

/* ---------- Footer ---------- */
footer.site{border-top:1px solid var(--line);padding:22px 0 34px;color:var(--muted);font-size:.86rem;background:var(--card)}
footer.site .wrap{display:flex;gap:14px;flex-wrap:wrap;justify-content:space-between;align-items:center}

/* ---------- Toast ---------- */
#toasts{position:fixed;bottom:20px;inset-inline-end:20px;z-index:200;display:flex;flex-direction:column;gap:10px;max-width:min(360px,90vw)}
.toast{background:#111c3a;color:#fff;padding:12px 16px;border-radius:12px;box-shadow:var(--shadow-lg);display:flex;gap:10px;align-items:center;animation:tin .25s ease;font-size:.9rem}
.toast.ok{background:#14532d}.toast.err{background:#7f1d1d}.toast.info{background:#1e3a8a}
@keyframes tin{from{transform:translateY(12px);opacity:0}to{transform:none;opacity:1}}

/* ---------- Modal ---------- */
.modal-back{position:fixed;inset:0;background:rgba(10,15,35,.55);display:none;place-items:center;z-index:150;padding:18px}
.modal-back.open{display:grid}
.modal{background:var(--card);color:var(--text);border-radius:16px;max-width:560px;width:100%;padding:24px;box-shadow:var(--shadow-lg);max-height:88vh;overflow:auto}

/* ---------- Drawer (mobile sidebar) ---------- */
.drawer-back{position:fixed;inset:0;background:rgba(10,15,35,.45);z-index:90;display:none}
.drawer-back.open{display:block}
.skip-link{position:absolute;inset-inline-start:-9999px;top:0;background:var(--brand);color:#fff;padding:10px 16px;z-index:300;border-radius:0 0 10px 0}
.skip-link:focus{inset-inline-start:0}
.kbd{background:var(--bg-soft);border:1px solid var(--line);border-bottom-width:2px;border-radius:6px;padding:1px 7px;font-size:.8rem;font-family:inherit}