:root {
  --primary: #2563eb; --primary-light: #dbeafe;
  --success: #16a34a; --success-light: #dcfce7;
  --danger: #dc2626; --danger-light: #fee2e2;
  --warm: #f59e0b; --warm-light: #fef3c7;
  --purple: #7c3aed; --purple-light: #ede9fe;
  --bg: #f8fafc; --card: #ffffff; --text: #1e293b;
  --muted: #64748b; --border: #e2e8f0; --surface: #f1f5f9;
  --radius: 12px; --radius-sm: 8px;
}
[data-theme="dark"] {
  --primary: #60a5fa; --primary-light: #1e3a5f;
  --success: #4ade80; --success-light: #14532d;
  --danger: #f87171; --danger-light: #450a0a;
  --warm: #fbbf24; --warm-light: #451a03;
  --purple: #a78bfa; --purple-light: #2e1065;
  --bg: #0f172a; --card: #1e293b; --text: #f1f5f9;
  --muted: #94a3b8; --border: #334155; --surface: #1e293b;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; }

/* Screens */
.screen { display: none; min-height: 100vh; }
.screen.active { display: block; }

/* ── Profile Screen ── */
.profile-wrap { max-width: 400px; margin: 0 auto; padding: 2rem 1rem 3rem; }
.profile-header { text-align: center; margin-bottom: 2rem; }
.app-logo { font-size: 56px; margin-bottom: .5rem; }
.profile-header h1 { font-size: 24px; font-weight: 700; color: var(--primary); }
#profile-list { display: flex; flex-direction: column; gap: 10px; margin-bottom: 1rem; }
.profile-card { display: flex; align-items: center; gap: 14px; background: var(--card); border: 1.5px solid var(--border); border-radius: var(--radius); padding: 14px 16px; cursor: pointer; transition: all .15s; }
.profile-card:hover { border-color: var(--primary); background: var(--primary-light); }
.profile-avatar { width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 22px; flex-shrink: 0; }
.profile-info { flex: 1; }
.profile-name { font-size: 16px; font-weight: 600; }
.profile-stats { font-size: 12px; color: var(--muted); margin-top: 2px; }
.profile-del { background: none; border: none; cursor: pointer; font-size: 18px; color: var(--muted); padding: 4px; }
.profile-del:hover { color: var(--danger); }
#lang-bar-profile { display: flex; gap: 7px; justify-content: center; margin-top: 1.5rem; flex-wrap: wrap; }

/* New profile form */
.new-profile-form { background: var(--card); border: 1.5px solid var(--primary); border-radius: var(--radius); padding: 1rem; margin-bottom: 1rem; }
.new-profile-form input { width: 100%; padding: 10px 12px; border: 1.5px solid var(--border); border-radius: var(--radius-sm); font-size: 15px; margin-bottom: 10px; outline: none; }
.new-profile-form input:focus { border-color: var(--primary); }
.emoji-picker { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.emoji-opt { font-size: 24px; padding: 4px 8px; border-radius: 8px; cursor: pointer; border: 2px solid transparent; }
.emoji-opt.selected { border-color: var(--primary); background: var(--primary-light); }
.form-btns { display: flex; gap: 8px; }

/* ── App Screen ── */
#app { max-width: 540px; margin: 0 auto; padding: .75rem 1rem 3rem; }
#top-bar { display: flex; align-items: center; gap: 10px; margin-bottom: .75rem; }
#player-name-display { flex: 1; font-size: 15px; font-weight: 600; text-align: center; }
.icon-btn { background: none; border: none; cursor: pointer; font-size: 20px; padding: 6px 8px; border-radius: var(--radius-sm); color: var(--muted); transition: all .15s; }
.icon-btn:hover { background: var(--surface); color: var(--text); }

/* Daily banner */
#daily-banner { background: linear-gradient(135deg, var(--primary-light), var(--purple-light)); border: 1.5px solid var(--primary); border-radius: var(--radius); padding: 10px 14px; margin-bottom: .75rem; display: flex; align-items: center; gap: 10px; }
#daily-text { font-size: 13px; font-weight: 600; color: var(--primary); flex: 1; }
#daily-dots { display: flex; gap: 5px; }
.daily-dot { width: 14px; height: 14px; border-radius: 50%; border: 2px solid var(--primary); background: transparent; }
.daily-dot.done { background: var(--primary); }

/* Badge toast */
#badge-toast { position: fixed; top: 16px; left: 50%; transform: translateX(-50%); background: var(--warm); color: #fff; padding: 10px 20px; border-radius: 20px; font-size: 14px; font-weight: 700; z-index: 1000; box-shadow: 0 4px 16px rgba(0,0,0,.2); animation: slideDown .4s ease; }
@keyframes slideDown { from { top: -40px; opacity: 0; } to { top: 16px; opacity: 1; } }

/* Scores */
#score-row { display: flex; gap: 8px; margin-bottom: .75rem; flex-wrap: nowrap; }
.score-card { flex: 1; min-width: 0; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 8px 10px; text-align: center; }
.score-label { font-size: 10px; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; margin-bottom: 1px; }
.score-val { font-size: 22px; font-weight: 700; }
.score-val.stars { font-size: 16px; }
#progress-wrap { background: var(--border); border-radius: 4px; height: 5px; margin-bottom: .75rem; overflow: hidden; }
#progress-bar { height: 100%; background: var(--primary); border-radius: 4px; transition: width .4s ease; width: 0%; }

/* Learning path */
#path-row { display: flex; gap: 6px; margin-bottom: .75rem; overflow-x: auto; padding-bottom: 2px; }
.path-step { flex-shrink: 0; width: 36px; height: 36px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 16px; border: 2px solid var(--border); background: var(--surface); color: var(--muted); transition: all .2s; }
.path-step.done { background: var(--success); border-color: var(--success); color: #fff; }
.path-step.current { background: var(--primary); border-color: var(--primary); color: #fff; box-shadow: 0 0 0 3px var(--primary-light); }
.path-step.locked { opacity: .4; cursor: not-allowed; }

/* Mode tabs */
#mode-tabs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin-bottom: .75rem; }
.mode-tab { padding: 8px 4px; border: 1.5px solid var(--border); border-radius: var(--radius-sm); background: var(--card); cursor: pointer; font-size: 11px; color: var(--muted); transition: all .15s; text-align: center; font-weight: 500; line-height: 1.3; }
.mode-tab:hover { border-color: var(--primary); }
.mode-tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.mode-tab.locked-tab { opacity: .4; cursor: not-allowed; }

/* Difficulty */
#difficulty-row { display: flex; gap: 6px; align-items: center; margin-bottom: .75rem; }
.diff-label { font-size: 12px; color: var(--muted); font-weight: 500; }
.diff-btn { padding: 4px 12px; border-radius: 14px; border: 1.5px solid var(--border); background: var(--card); cursor: pointer; font-size: 11px; color: var(--muted); transition: all .15s; font-weight: 500; }
.diff-btn.active { background: var(--warm); color: #fff; border-color: var(--warm); }

/* Task card */
#task-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; box-shadow: 0 2px 8px rgba(0,0,0,.05); margin-bottom: 1rem; }
#task-text { font-size: 18px; font-weight: 600; margin-bottom: 5px; }
#task-sub { font-size: 12px; color: var(--muted); margin-bottom: .875rem; }

/* Timer bar */
#timer-bar-wrap { height: 6px; background: var(--border); border-radius: 3px; margin-bottom: .875rem; overflow: hidden; }
#timer-bar { height: 100%; background: var(--warm); border-radius: 3px; transition: width .1s linear; }
#timer-bar.urgent { background: var(--danger); }

#clock-wrap { display: flex; justify-content: center; margin-bottom: .875rem; }
#clock-svg { touch-action: none; }

/* Text task box */
#text-task-box { background: var(--primary-light); border: 2px solid var(--primary); border-radius: var(--radius); padding: 1.25rem 1.25rem 1rem; margin-bottom: .875rem; text-align: center; }
#text-task-main { font-size: 24px; font-weight: 700; color: var(--primary); line-height: 1.3; }
#text-task-hint { font-size: 12px; color: #2563eb99; margin-top: 4px; }

/* Answer grid */
#answer-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; margin-bottom: .875rem; }
.answer-btn { padding: 11px 6px; border: 1.5px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); cursor: pointer; font-size: 13px; font-weight: 600; color: var(--text); transition: all .15s; text-align: center; }
.answer-btn:hover:not(:disabled) { border-color: var(--primary); background: var(--primary-light); color: var(--primary); }
.answer-btn.correct { background: var(--success-light); border-color: var(--success); color: var(--success); }
.answer-btn.wrong { background: var(--danger-light); border-color: var(--danger); color: var(--danger); }
.answer-btn:disabled { cursor: default; }

/* Word chips */
#word-area { margin-bottom: .875rem; }
#word-bank { display: flex; flex-wrap: wrap; gap: 7px; min-height: 44px; padding: 10px; background: var(--surface); border-radius: var(--radius-sm); border: 1.5px dashed var(--border); margin-bottom: 8px; }
#word-answer { display: flex; flex-wrap: wrap; gap: 7px; min-height: 50px; padding: 10px; background: #fff; border-radius: var(--radius-sm); border: 1.5px solid var(--border); align-items: center; }
#word-answer-label { font-size: 11px; color: var(--muted); width: 100%; margin-bottom: 3px; }
.word-chip { padding: 7px 13px; border-radius: 18px; border: 1.5px solid var(--primary); background: var(--primary-light); color: var(--primary); cursor: pointer; font-size: 13px; font-weight: 600; transition: all .15s; user-select: none; }
.word-chip:hover { background: var(--primary); color: #fff; }
.word-chip.in-answer { border-color: var(--success); background: var(--success-light); color: var(--success); }
#word-area.answered .word-chip { cursor: default; pointer-events: none; }

/* Feedback */
#feedback { min-height: 40px; border-radius: var(--radius-sm); padding: 9px 14px; font-size: 13px; font-weight: 600; text-align: center; display: flex; align-items: center; justify-content: center; gap: 6px; margin-bottom: .75rem; transition: all .3s; }
.fb-neutral { background: var(--surface); color: var(--muted); }
.fb-success { background: var(--success-light); color: var(--success); }
.fb-error { background: var(--danger-light); color: var(--danger); }

/* Buttons */
#btn-row { display: flex; gap: 8px; }
.btn { flex: 1; padding: 10px; border-radius: var(--radius-sm); border: 1.5px solid var(--border); background: var(--surface); cursor: pointer; font-size: 13px; color: var(--text); transition: all .15s; font-weight: 500; }
.btn:hover { background: var(--border); }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { opacity: .9; background: var(--primary); }
.btn-outline { background: transparent; border: 1.5px solid var(--primary); color: var(--primary); border-radius: var(--radius-sm); padding: 10px; cursor: pointer; font-size: 13px; font-weight: 600; width: 100%; transition: all .15s; }
.btn-outline:hover { background: var(--primary-light); }
.btn-danger { background: var(--danger); color: #fff; border: none; border-radius: var(--radius-sm); padding: 8px 16px; cursor: pointer; font-size: 13px; font-weight: 600; }

/* Badges */
#badges-section { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.25rem; }
.section-title { font-size: 13px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; margin-bottom: .75rem; }
#badges-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(64px, 1fr)); gap: 10px; }
.badge-item { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.badge-icon { width: 48px; height: 48px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 24px; border: 2px solid var(--border); background: var(--surface); transition: all .2s; }
.badge-icon.earned { border-color: var(--warm); background: var(--warm-light); box-shadow: 0 0 0 3px var(--warm-light); }
.badge-icon.locked-badge { filter: grayscale(1); opacity: .35; }
.badge-label { font-size: 10px; color: var(--muted); text-align: center; line-height: 1.2; }

/* Settings */
.settings-wrap { max-width: 400px; margin: 0 auto; padding: 1rem 1rem 3rem; }
.settings-wrap h2 { font-size: 20px; font-weight: 700; margin-bottom: 1.5rem; margin-top: .5rem; }
.setting-row { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; border-bottom: 1px solid var(--border); gap: 12px; flex-wrap: wrap; }
.setting-row label { font-size: 14px; font-weight: 500; }
.danger-row { border-bottom: none; margin-top: .5rem; }
.toggle-btn { padding: 6px 16px; border-radius: 14px; border: 1.5px solid var(--border); background: var(--surface); cursor: pointer; font-size: 12px; font-weight: 700; color: var(--muted); transition: all .15s; min-width: 56px; }
.toggle-btn.on { background: var(--success); border-color: var(--success); color: #fff; }
#timer-options { display: flex; gap: 6px; flex-wrap: wrap; }
.timer-opt { padding: 5px 12px; border-radius: 14px; border: 1.5px solid var(--border); background: var(--card); cursor: pointer; font-size: 12px; font-weight: 600; color: var(--muted); }
.timer-opt.active { background: var(--warm); border-color: var(--warm); color: #fff; }
#lang-bar-settings { display: flex; gap: 6px; flex-wrap: wrap; }
.lang-btn { padding: 6px 12px; border-radius: 18px; border: 1.5px solid var(--border); background: var(--card); cursor: pointer; font-size: 12px; color: var(--muted); font-weight: 500; transition: all .15s; }
.lang-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* Number exercise popup */
.mode-tab.mode-tab-locked { opacity: .45; cursor: not-allowed; }
.mode-tab.mode-tab-locked:hover { border-color: var(--border); }
#num-popup-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.55); z-index: 1500;
  display: flex; align-items: center; justify-content: center; padding: 1.5rem;
}
#num-popup-overlay.hidden { display: none; }
#num-popup-box {
  background: var(--card); border-radius: var(--radius);
  padding: 1.75rem 1.5rem; max-width: 360px; width: 100%;
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}
#num-popup-title { font-size: 18px; font-weight: 700; color: var(--primary); margin-bottom: 6px; }
#num-popup-sub { font-size: 13px; color: var(--muted); margin-bottom: 1.25rem; }
#num-popup-number {
  font-size: 56px; font-weight: 700; color: var(--text);
  text-align: center; margin-bottom: 1.25rem;
  background: var(--surface); border-radius: var(--radius); padding: .75rem;
}
#num-popup-input {
  width: 100%; padding: 11px 14px; border: 1.5px solid var(--border);
  border-radius: var(--radius-sm); font-size: 16px; margin-bottom: .875rem;
  outline: none; background: var(--card); color: var(--text);
}
#num-popup-input:focus { border-color: var(--primary); }
#num-popup-feedback { margin-bottom: .875rem; border-radius: var(--radius-sm); padding: 9px 14px; font-size: 13px; font-weight: 600; text-align: center; min-height: 40px; display: flex; align-items: center; justify-content: center; }
#num-popup-btns { display: flex; gap: 8px; }

/* Number stats table */
#num-stats-section { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.25rem; margin-top: 1rem; }
.num-stats-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; margin-top: .75rem; }
.num-stat-cell { background: var(--surface); border-radius: var(--radius-sm); padding: 6px 4px; text-align: center; }
.num-stat-n { font-size: 16px; font-weight: 700; color: var(--text); }
.num-stat-s { font-size: 10px; color: var(--muted); margin-top: 2px; }
#disclaimer-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.55); z-index: 2000;
  display: flex; align-items: center; justify-content: center;
  padding: 1.5rem;
}
#disclaimer-overlay.hidden { display: none; }
#disclaimer-box {
  background: var(--card); border-radius: var(--radius);
  padding: 2rem 1.5rem; max-width: 380px; width: 100%;
  text-align: center; box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}
#disclaimer-icon { font-size: 48px; margin-bottom: .75rem; }
#disclaimer-title { font-size: 22px; font-weight: 700; color: var(--primary); margin-bottom: 1rem; }
#disclaimer-text { font-size: 13px; color: var(--muted); line-height: 1.7; margin-bottom: 1.5rem; }
#disclaimer-btn {
  background: var(--primary); color: #fff; border: none;
  border-radius: var(--radius-sm); padding: 11px 32px;
  font-size: 14px; font-weight: 600; cursor: pointer; width: 100%;
}
#disclaimer-btn:hover { opacity: .9; }
#celebrate { position: fixed; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; z-index: 999; display: none; }
.confetti { position: absolute; width: 10px; height: 10px; border-radius: 2px; animation: fall 1s ease-in forwards; }
@keyframes fall { 0% { transform: translateY(-20px) rotate(0deg); opacity: 1; } 100% { transform: translateY(100vh) rotate(720deg); opacity: 0; } }

@media(max-width:380px) {
  #mode-tabs { grid-template-columns: repeat(2, 1fr); }
  .mode-tab { font-size: 10px; }
  #text-task-main { font-size: 20px; }
}