/* Math Play — mobile-first Armenian school math game */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+Armenian:wght@400;600;700&display=swap');

:root {
  --bg:        #f0f4ff;
  --surface:   #ffffff;
  --border:    #d0d9f0;
  --text:      #1a2540;
  --muted:     #5a6888;
  --accent:    #3b5bdb;
  --accent-s:  #dbe4ff;
  --success:   #2f9e44;
  --success-s: #d3f9d8;
  --danger:    #c92a2a;
  --danger-s:  #ffe3e3;
  --warn:      #e67700;
  --warn-s:    #fff3bf;
  --gold:      #f59f00;
  --radius:    14px;
  --shadow:    0 8px 24px rgba(30,50,100,.10);
}

* { box-sizing: border-box; }
html { font-size: 16px; }
html, body { margin: 0; min-height: 100dvh; }
body {
  font-family: 'Noto Sans Armenian','Segoe UI',system-ui,sans-serif;
  color: var(--text);
  background: linear-gradient(160deg,#e8eeff 0%,#f8f9ff 60%,#e8fff0 100%);
  -webkit-tap-highlight-color: transparent;
}

/* ── Layout ─────────────────────────────────────────────────────────────────── */
.shell   { max-width: 480px; margin: 0 auto; padding: 16px env(safe-area-inset-right) 24px env(safe-area-inset-left); }
.wide    { max-width: 900px; }
.card    { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; }
.card + .card { margin-top: 14px; }

/* ── Typography ─────────────────────────────────────────────────────────────── */
h1 { font-size: 1.5rem; font-weight: 700; margin: 0 0 6px; }
h2 { font-size: 1.15rem; font-weight: 700; margin: 0 0 14px; }
h3 { font-size: 1rem; font-weight: 600; margin: 0 0 10px; }
p  { margin: 0 0 10px; line-height: 1.65; }
a  { color: var(--accent); }
.muted  { color: var(--muted); font-size: .85rem; }
.hidden { display: none !important; }

/* ── Forms ──────────────────────────────────────────────────────────────────── */
.field { margin-bottom: 14px; }
label  { display: block; font-size: .82rem; font-weight: 700; color: var(--muted); margin-bottom: 5px; text-transform: uppercase; letter-spacing: .03em; }
input, select, textarea {
  width: 100%; padding: 13px 14px; border: 1.5px solid var(--border);
  border-radius: 10px; font-size: 1rem; font-family: inherit;
  background: var(--surface); color: var(--text); transition: border-color .15s;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-s); }
textarea { resize: vertical; min-height: 72px; }

/* ── Buttons ────────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 22px; border: none; border-radius: 10px;
  font-size: 1rem; font-family: inherit; font-weight: 700;
  cursor: pointer; text-decoration: none; min-height: 52px;
  transition: opacity .15s, transform .1s, box-shadow .15s;
  -webkit-user-select: none; user-select: none;
}
.btn:active:not(:disabled) { transform: scale(.96); }
.btn:disabled  { opacity: .45; cursor: not-allowed; }
.btn-primary   { background: var(--accent); color: #fff; box-shadow: 0 4px 12px rgba(59,91,219,.3); }
.btn-primary:hover:not(:disabled) { opacity: .9; box-shadow: 0 6px 16px rgba(59,91,219,.4); }
.btn-success   { background: var(--success); color: #fff; }
.btn-danger    { background: var(--danger); color: #fff; }
.btn-secondary { background: var(--surface); color: var(--text); border: 1.5px solid var(--border); }
.btn-secondary:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.btn-full      { width: 100%; }
.btn-sm        { padding: 9px 14px; font-size: .88rem; min-height: 38px; }

/* ── Alerts ─────────────────────────────────────────────────────────────────── */
.alert        { padding: 12px 16px; border-radius: 10px; font-size: .9rem; margin-bottom: 14px; }
.alert-error  { background: var(--danger-s); color: var(--danger); border: 1px solid #ffb3b3; }
.alert-success{ background: var(--success-s); color: var(--success); border: 1px solid #8ce99a; }
.alert-info   { background: var(--accent-s); color: var(--accent); border: 1px solid #bac8ff; }
.alert-warn   { background: var(--warn-s); color: var(--warn); border: 1px solid #ffd43b; }

/* ── Progress strip ─────────────────────────────────────────────────────────── */
.progress-strip        { display: flex; gap: 6px; margin: 12px 0; }
.progress-dot          { width: 18px; height: 18px; border-radius: 50%; background: var(--border); transition: background .4s, transform .3s; }
.progress-dot.done     { background: var(--success); transform: scale(1.15); }
.progress-dot.current  { background: var(--accent); box-shadow: 0 0 0 3px var(--accent-s); }

/* ── Prize reveal ───────────────────────────────────────────────────────────── */
.prize-wrap       { position: relative; border-radius: 14px; overflow: hidden; box-shadow: var(--shadow); aspect-ratio: 4/3; max-width: 100%; }
.prize-img        { width: 100%; height: 100%; object-fit: cover; display: block; }
.prize-grid       { position: absolute; inset: 0; display: grid; grid-template-columns: repeat(4,1fr); grid-template-rows: repeat(5,1fr); pointer-events: none; }
.prize-tile       { background: linear-gradient(135deg,#c5d0f0,#a8bce8); border: 1px solid rgba(255,255,255,.25); transition: opacity .55s ease; }
.prize-tile.show  { opacity: 0; }
.prize-pct        { position: absolute; top: 8px; right: 10px; background: rgba(0,0,0,.55); color: #fff; font-size: .8rem; font-weight: 700; padding: 3px 8px; border-radius: 20px; }

.prize-done-banner { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; background: rgba(0,0,0,.30); }
.prize-done-text   { color: #fff; font-size: 1.4rem; font-weight: 700; text-shadow: 0 2px 8px rgba(0,0,0,.6); text-align: center; padding: 0 12px; }

@keyframes pulse-prize { 0%,100%{transform:scale(1)} 50%{transform:scale(1.04)} }
.prize-pulse { animation: pulse-prize .7s ease 3; }
@media (prefers-reduced-motion: reduce) { .prize-pulse { animation: none; } }

/* ── Exercise card ──────────────────────────────────────────────────────────── */
.task-header   { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; color: var(--muted); font-size: .85rem; font-weight: 600; }
.task-q        { font-size: 1.3rem; font-weight: 700; margin-bottom: 18px; line-height: 1.4; min-height: 60px; }
.task-q.big    { font-size: 1.8rem; text-align: center; }
.answer-input  { font-size: 1.2rem; text-align: center; font-weight: 700; letter-spacing: .05em; }

.thinking-area { background: var(--bg); border: 1.5px dashed var(--border); border-radius: 10px; padding: 12px; margin-bottom: 14px; }
.thinking-area summary { cursor: pointer; font-size: .88rem; font-weight: 600; color: var(--muted); list-style: none; display: flex; align-items: center; gap: 6px; }
.thinking-area summary::before { content: "✏️"; }
.thinking-area[open] summary::before { content: "📝"; }
.thinking-area textarea { border: none; background: transparent; resize: vertical; min-height: 60px; }

.hint-panel     { margin-bottom: 14px; }
.hint-text      { background: var(--warn-s); border-left: 4px solid var(--warn); border-radius: 0 8px 8px 0; padding: 10px 14px; font-size: .92rem; margin-bottom: 8px; }
.hint-level-tag { font-size: .75rem; font-weight: 700; color: var(--warn); margin-bottom: 4px; }

.feedback-area  { margin: 14px 0; }
.feedback-ok    { background: var(--success-s); border-left: 4px solid var(--success); border-radius: 0 10px 10px 0; padding: 12px 16px; font-weight: 600; }
.feedback-wrong { background: var(--danger-s); border-left: 4px solid var(--danger); border-radius: 0 10px 10px 0; padding: 12px 16px; font-weight: 600; }
.explanation    { background: var(--accent-s); border-radius: 10px; padding: 10px 14px; margin-top: 8px; font-size: .9rem; }

/* ── Compare buttons ────────────────────────────────────────────────────────── */
.compare-row { display: flex; gap: 10px; justify-content: center; margin-bottom: 14px; }
.compare-btn { font-size: 1.4rem; font-weight: 900; padding: 14px 24px; min-width: 72px; }

/* ── Celebration overlay ────────────────────────────────────────────────────── */
.celebration-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.45);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  z-index: 100; padding: 24px;
}
.celebration-card {
  background: var(--surface); border-radius: 20px; padding: 32px 24px;
  text-align: center; max-width: 320px; width: 100%; box-shadow: 0 20px 60px rgba(0,0,0,.25);
}
.celebration-emoji { font-size: 3rem; display: block; margin-bottom: 12px; }
.celebration-title { font-size: 1.6rem; font-weight: 700; margin-bottom: 8px; }

/* ── Admin / Teacher dashboard ──────────────────────────────────────────────── */
.nav-bar     { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; background: var(--surface); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 20; }
.nav-title   { font-weight: 700; font-size: 1rem; }
.tab-bar     { display: flex; gap: 2px; border-bottom: 2px solid var(--border); margin-bottom: 16px; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.tab-btn     { padding: 10px 16px; font-size: .88rem; font-weight: 600; cursor: pointer; border: none; background: none; color: var(--muted); white-space: nowrap; border-bottom: 3px solid transparent; margin-bottom: -2px; }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-pane    { display: none; }
.tab-pane.active { display: block; }

.stat-grid  { display: grid; grid-template-columns: repeat(auto-fit,minmax(110px,1fr)); gap: 10px; margin-bottom: 16px; }
.stat-card  { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 14px; text-align: center; }
.stat-num   { font-size: 1.7rem; font-weight: 700; color: var(--accent); }
.stat-label { font-size: .75rem; color: var(--muted); margin-top: 4px; }

.pupil-table { width: 100%; border-collapse: collapse; font-size: .88rem; }
.pupil-table th { text-align: left; padding: 8px 10px; background: var(--bg); color: var(--muted); font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; }
.pupil-table td { padding: 9px 10px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.pupil-table tr:last-child td { border-bottom: none; }

.status-badge { display: inline-block; padding: 2px 9px; border-radius: 20px; font-size: .75rem; font-weight: 700; }
.sb-done    { background: var(--success-s); color: var(--success); }
.sb-prog    { background: var(--accent-s); color: var(--accent); }
.sb-wait    { background: #f0f0f0; color: #666; }
.sb-warn    { background: var(--warn-s); color: var(--warn); }

.pill-row   { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 10px; }
.pill       { display: inline-flex; align-items: center; gap: 4px; padding: 4px 10px; border-radius: 20px; font-size: .82rem; font-weight: 600; background: var(--accent-s); color: var(--accent); cursor: pointer; border: 1px solid var(--accent-s); transition: background .12s; }
.pill:hover { background: #bac8ff; }
.pill.selected { background: var(--accent); color: #fff; }

.task-template-row { display: flex; gap: 8px; align-items: center; padding: 9px 0; border-bottom: 1px solid var(--border); }
.task-template-row:last-child { border-bottom: none; }
.tmpl-seq  { color: var(--muted); font-size: .8rem; min-width: 22px; }
.tmpl-info { flex: 1; }
.tmpl-q    { font-weight: 600; font-size: .9rem; }
.tmpl-meta { font-size: .75rem; color: var(--muted); }
.tmpl-drag { cursor: grab; color: var(--muted); padding: 0 6px; font-size: 1.2rem; line-height: 1; user-select: none; touch-action: none; }
.tmpl-drag:active { cursor: grabbing; }

/* ── Upload area ────────────────────────────────────────────────────────────── */
.upload-area { border: 2px dashed var(--border); border-radius: 12px; padding: 28px; text-align: center; cursor: pointer; transition: border-color .2s; }
.upload-area:hover, .upload-area.over { border-color: var(--accent); background: var(--accent-s); }
.upload-preview { max-width: 100%; max-height: 200px; border-radius: 10px; margin-top: 10px; }

/* ── Offline banner ─────────────────────────────────────────────────────────── */
.offline-banner { position: fixed; top: 0; left: 0; right: 0; background: var(--warn); color: #fff; padding: 8px 16px; text-align: center; font-size: .85rem; font-weight: 600; z-index: 50; transform: translateY(-100%); transition: transform .3s; }
.offline-banner.show { transform: translateY(0); }