/* ============================================================
   English Quest — Shared Stylesheet
   Design tokens extracted from english-quest-ui-design.html
   ============================================================ */
:root{
  --ink:#16232B; --ink-soft:#5C6E76;
  --paper:#EFF7F4; --canvas:#E3EEEA; --card:#FFFFFF;
  --teal:#0EA893; --teal-dark:#0A8271; --teal-pale:#DCF4EF;
  --coral:#FF6F59; --coral-pale:#FFE4DF;
  --gold:#FFB627; --gold-pale:#FFF1D2;
  --grape:#7C6FF0; --grape-pale:#EAE7FF;
  --blue:#3E8EF7; --blue-pale:#E4EFFE;
  --line:#DCE7E2;
  --radius-lg:28px; --radius-md:16px; --radius-sm:10px;
  --shadow-card: 0 2px 0 var(--line), 0 14px 30px -18px rgba(22,35,43,0.25);
  --shadow-frame: 0 30px 60px -25px rgba(22,35,43,0.45);
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background:var(--canvas);
  background-image:radial-gradient(circle at 1px 1px, rgba(22,35,43,0.06) 1px, transparent 0);
  background-size:22px 22px;
  font-family:'Sarabun',sans-serif;
  color:var(--ink);
  min-height:100vh;
}
h1,h2,h3,.brand-name,.font-kanit{font-family:'Kanit',sans-serif;}
a{color:inherit;text-decoration:none;}
::selection{background:var(--gold-pale);}

/* ---------- LAYOUT ---------- */
.app{display:grid;grid-template-columns:280px 1fr;min-height:100vh;}
.sidebar{background:var(--ink);color:#fff;padding:28px 20px 24px;position:sticky;top:0;height:100vh;overflow-y:auto;}
.brand{display:flex;align-items:center;gap:10px;margin-bottom:6px;}
.brand-mark{width:34px;height:34px;border-radius:10px;flex-shrink:0;object-fit:cover;display:block;}
.brand-name{font-weight:700;font-size:17px;letter-spacing:.2px;}
.brand-sub{font-size:11.5px;color:rgba(255,255,255,.5);margin:0 0 26px 0;letter-spacing:.3px;}
.nav-group-label{font-size:11px;text-transform:uppercase;letter-spacing:1.2px;color:rgba(255,255,255,.38);margin:20px 0 8px 4px;font-weight:600;}
.nav-btn{width:100%;display:flex;align-items:center;gap:10px;background:transparent;border:none;color:rgba(255,255,255,.75);padding:9px 10px;border-radius:10px;font-family:'Sarabun',sans-serif;font-size:13.5px;font-weight:500;text-align:left;cursor:pointer;transition:background .15s ease,color .15s ease;}
.nav-btn .dot{width:7px;height:7px;border-radius:50%;background:rgba(255,255,255,.25);flex-shrink:0;}
.nav-btn:hover{background:rgba(255,255,255,.06);color:#fff;}
.nav-btn.active{background:rgba(255,255,255,.12);color:#fff;}
.nav-btn.active .dot{background:var(--gold);}
.main{padding:36px 40px 80px;max-width:1280px;margin:0 auto;width:100%;}

/* ---------- TOP BAR (mobile) ---------- */
.topbar{display:none;background:var(--ink);color:#fff;padding:14px 18px;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:20;gap:12px;}
.topbar-left{display:flex;align-items:center;gap:12px;min-width:0;}
.hamburger-btn{display:none;background:none;border:none;color:#fff;font-size:22px;line-height:1;padding:8px;margin:-8px;cursor:pointer;flex-shrink:0;width:40px;height:40px;align-items:center;justify-content:center;border-radius:10px;}
.hamburger-btn:active{background:rgba(255,255,255,.12);}
.sidebar-backdrop{display:none;position:fixed;inset:0;background:rgba(22,35,43,.55);z-index:29;}
.sidebar-backdrop.show{display:block;}

@media (max-width:900px){
  .app{grid-template-columns:1fr;}
  .sidebar{
    display:block;position:fixed;top:0;left:0;bottom:0;width:min(78vw,300px);
    height:100vh;z-index:30;transform:translateX(-100%);
    transition:transform .22s ease;box-shadow:0 0 40px rgba(0,0,0,.35);
  }
  .sidebar.open{transform:translateX(0);}
  .topbar{display:flex;}
  .hamburger-btn{display:flex;}
  .main{padding:20px 16px 60px;}
  /* Nav buttons and other tappable rows get a real touch target on mobile */
  .nav-btn{padding:13px 12px;font-size:14.5px;min-height:44px;}
  .btn{min-height:44px;}
  .chip{min-height:44px;padding:11px 16px;}
}

/* ---------- COMPONENTS ---------- */
.card{background:var(--card);border-radius:var(--radius-md);box-shadow:var(--shadow-card);padding:20px;}
.eyebrow{font-size:11.5px;font-weight:700;letter-spacing:1.4px;text-transform:uppercase;color:var(--teal-dark);margin:0 0 6px 0;}
.page-title{font-weight:700;font-size:26px;margin:0 0 8px 0;}
.page-desc{font-size:14px;color:var(--ink-soft);max-width:720px;line-height:1.6;margin:0 0 26px 0;}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:'Sarabun',sans-serif;font-weight:600;font-size:14px;padding:12px 22px;border-radius:14px;border:none;cursor:pointer;transition:transform .1s ease, filter .15s ease;}
.btn:active{transform:translateY(1px);}
.btn-primary{background:var(--teal);color:#fff;box-shadow:0 4px 0 var(--teal-dark);}
.btn-primary:hover{filter:brightness(1.05);}
.btn-primary:active{box-shadow:0 2px 0 var(--teal-dark);}
.btn-secondary{background:#fff;color:var(--ink);border:1.5px solid var(--line);}
.btn-coral{background:var(--coral);color:#fff;box-shadow:0 4px 0 #C94E3D;}
.btn-ghost{background:transparent;color:var(--ink-soft);}
.btn-block{width:100%;}
.btn[disabled]{opacity:.45;cursor:not-allowed;box-shadow:none;}

.badge{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:20px;font-size:12px;font-weight:600;}
.badge-teal{background:var(--teal-pale);color:var(--teal-dark);}
.badge-gold{background:var(--gold-pale);color:#946A00;}
.badge-coral{background:var(--coral-pale);color:#B8402F;}
.badge-grape{background:var(--grape-pale);color:#5240C4;}

.input{width:100%;padding:13px 16px;border-radius:12px;border:1.5px solid var(--line);font-family:'Sarabun',sans-serif;font-size:14px;background:#fff;color:var(--ink);}
.input:focus{outline:none;border-color:var(--teal);}
.field{margin-bottom:16px;}
.field label{display:block;font-size:13px;font-weight:600;margin-bottom:6px;color:var(--ink-soft);}

.progress-track{width:100%;height:12px;border-radius:20px;background:var(--paper);overflow:hidden;border:1px solid var(--line);}
.progress-fill{height:100%;background:linear-gradient(90deg,var(--teal),var(--teal-dark));border-radius:20px;transition:width .3s ease;}

.stat-pill{display:flex;align-items:center;gap:6px;background:#fff;border:1px solid var(--line);border-radius:20px;padding:6px 12px;font-weight:700;font-size:13px;color: #000;}

/* Exercise player layout — shared by frontend/pages/lesson.html and
   admin/pages/exercises.html (live preview), see assets/js/exercise-player.js */
.q-label{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:var(--teal-dark);margin-bottom:10px;}
.q-prompt{font-size:19px;font-weight:600;margin-bottom:24px;line-height:1.5;}
.word-bank{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:20px;min-height:52px;}
.answer-slot{display:flex;flex-wrap:wrap;gap:10px;min-height:52px;padding:12px;border:2px dashed var(--line);border-radius:12px;margin-bottom:20px;}
.match-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;}

.chip{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 16px;border-radius:12px;background:#fff;border:1.5px solid var(--line);font-weight:600;font-size:15px;cursor:pointer;user-select:none;transition:all .12s ease;}
.chip:hover{border-color:var(--teal);}
.chip.selected{background:var(--teal-pale);border-color:var(--teal);color:var(--teal-dark);}
.chip.picking{background:var(--gold-pale);border-color:var(--gold);color:#946A00;}
.chip.wrong{background:var(--coral-pale);border-color:var(--coral);color:#B8402F;animation:chip-shake .35s ease;}
.chip.correct{background:var(--teal-pale);border-color:var(--teal);color:var(--teal-dark);cursor:default;}
.chip.correct .check-mark{color:var(--teal-dark);font-weight:700;}
@keyframes chip-shake{
  0%,100%{transform:translateX(0);}
  20%{transform:translateX(-6px);}
  40%{transform:translateX(6px);}
  60%{transform:translateX(-4px);}
  80%{transform:translateX(4px);}
}

.table{width:100%;border-collapse:collapse;font-size:13.5px;}
.table th{text-align:left;color:var(--ink-soft);font-weight:600;padding:10px 12px;border-bottom:1.5px solid var(--line);font-size:12px;text-transform:uppercase;letter-spacing:.5px;}
.table td{padding:12px;border-bottom:1px solid var(--line);}
.table tr:hover td{background:var(--paper);}

.grid{display:grid;gap:18px;}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}
@media (max-width:900px){.grid-3,.grid-4{grid-template-columns:1fr;}}

.modal-bg{position:fixed;inset:0;background:rgba(22,35,43,.5);display:flex;align-items:center;justify-content:center;z-index:50;}
.modal{background:#fff;border-radius:var(--radius-md);padding:28px;max-width:420px;width:92%;box-shadow:var(--shadow-frame);}

.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--ink);color:#fff;padding:12px 22px;border-radius:14px;font-size:14px;font-weight:600;z-index:60;}

/* Logout confirmation modal */
.modal-backdrop{
  position:fixed;inset:0;z-index:200;
  background:rgba(22,35,43,.45);
  backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
  display:none;align-items:center;justify-content:center;padding:20px;
  opacity:0;transition:opacity .18s ease;
}
.modal-backdrop.show{display:flex;opacity:1;}
.modal-card{
  background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-frame);
  padding:32px 28px;max-width:340px;width:100%;text-align:center;
  transform:scale(.94);transition:transform .18s ease;
}
.modal-backdrop.show .modal-card{transform:scale(1);}
.modal-card h3{margin:0 0 8px;font-size:20px;}
.modal-desc{color:var(--ink-soft);font-size:14px;margin:0 0 22px;}
.modal-actions{display:flex;gap:10px;justify-content:center;}
.modal-actions .btn{flex:1;}