/* ============================================================
   DevQuest game theme — playful, chunky, Duolingo-inspired
   ============================================================ */

:root {
    --bg: #eef0fb;
    --bg-accent: #e4e7fa;
    --surface: #ffffff;
    --ink: #1e2340;
    --muted: #6b7191;
    --primary: #5b5bd6;
    --primary-deep: #4747c2;
    --primary-soft: #ecebfd;
    --green: #22c55e;
    --green-deep: #16a34a;
    --red: #ef4444;
    --red-deep: #dc2626;
    --gold: #f59e0b;
    --teal: #2dd4bf;
    --night: #171a33;
    --night-surface: #232748;
    --night-ink: #e8eaf6;
    --night-muted: #9aa0c3;
    --radius: 18px;
    --shadow: 0 10px 30px rgba(30, 35, 64, 0.10);
    --font: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}

h1:focus, h2:focus, h3:focus { outline: none; }

html, body {
    margin: 0;
    padding: 0;
    font-family: var(--font);
    background: var(--bg);
    color: var(--ink);
    min-height: 100vh;
}

#app, .app-root { min-height: 100vh; display: flex; flex-direction: column; }

.app-root.dark {
    --bg: #12142b;
    --bg-accent: #1b1e3d;
    --surface: var(--night-surface);
    --ink: var(--night-ink);
    --muted: var(--night-muted);
    --primary-soft: #2c2f5c;
}

.mono, code, pre, .code-editor, .blank-input {
    font-family: "Cascadia Code", "Fira Code", Consolas, "Courier New", monospace;
}

.muted { color: var(--muted); }
.grow { flex: 1; }

/* ---------- loading ---------- */
.app-loading {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

/* ---------- top bar ---------- */
.topbar {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 10px 18px;
    background: var(--surface);
    box-shadow: 0 2px 12px rgba(30, 35, 64, 0.08);
    position: sticky;
    top: 0;
    z-index: 40;
    flex-wrap: wrap;
}

.topbar-brand { display: flex; align-items: center; gap: 8px; text-decoration: none; color: var(--ink); }
.brand-name { font-weight: 800; font-size: 1.15rem; letter-spacing: 0.3px; }

.topbar-stats { display: flex; gap: 8px; flex-wrap: wrap; }

.stat-chip {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    background: var(--primary-soft);
    color: var(--primary-deep);
    font-weight: 700;
    font-size: 0.85rem;
    padding: 6px 12px;
    border-radius: 999px;
    white-space: nowrap;
}

.stat-streak { background: #fee2e2; color: #b91c1c; }
.app-root.dark .stat-streak { background: #3d1d1d; color: #fca5a5; }

.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }

.lang-toggle {
    border: 2px solid var(--primary);
    background: transparent;
    color: var(--primary);
    font-weight: 800;
    border-radius: 999px;
    padding: 5px 12px;
    cursor: pointer;
    font-size: 0.85rem;
}
.lang-toggle:hover { background: var(--primary-soft); }

.avatar-chip {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--ink);
    font-weight: 700;
    background: var(--bg);
    padding: 4px 12px 4px 6px;
    border-radius: 999px;
}
.avatar-chip:hover { background: var(--primary-soft); }

/* ---------- bottom nav ---------- */
.bottom-nav { display: none; }

/* ---------- buttons ---------- */
.btn {
    border: none;
    cursor: pointer;
    font-family: var(--font);
    font-weight: 800;
    font-size: 1rem;
    padding: 14px 24px;
    border-radius: 16px;
    transition: transform 0.05s ease, filter 0.15s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
}
.btn:active { transform: translateY(2px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary { background: var(--green); color: #fff; box-shadow: 0 4px 0 var(--green-deep); }
.btn-primary:hover:not(:disabled) { filter: brightness(1.05); }
.btn-primary:active:not(:disabled) { box-shadow: 0 1px 0 var(--green-deep); }

.btn-secondary { background: var(--primary); color: #fff; box-shadow: 0 4px 0 var(--primary-deep); }
.btn-secondary:active:not(:disabled) { box-shadow: 0 1px 0 var(--primary-deep); }

.btn-danger { background: var(--red); color: #fff; box-shadow: 0 4px 0 var(--red-deep); }

.btn-ghost { background: transparent; color: var(--muted); }
.btn-ghost:hover { background: var(--bg-accent); }

.btn-block { width: 100%; }
.btn-small { padding: 8px 14px; font-size: 0.85rem; border-radius: 12px; }

.icon-btn {
    border: none;
    background: var(--bg-accent);
    color: var(--ink);
    width: 38px;
    height: 38px;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 700;
}
.icon-btn:hover { background: var(--primary-soft); }
.icon-btn.small { width: 28px; height: 28px; font-size: 0.8rem; border-radius: 8px; }

/* ---------- inputs ---------- */
.text-input {
    width: 100%;
    box-sizing: border-box;
    padding: 13px 16px;
    border: 2px solid #d6d9ef;
    border-radius: 14px;
    font-size: 1rem;
    font-family: var(--font);
    background: var(--surface);
    color: var(--ink);
}
.text-input:focus { outline: none; border-color: var(--primary); }
.text-input.valid { border-color: var(--green); }
.text-input.invalid { border-color: var(--red); }
.text-input.big-input { font-size: 1.1rem; }

.field-label { display: block; font-weight: 800; margin: 18px 0 6px; font-size: 0.92rem; }
.field-hint { font-size: 0.85rem; margin: 6px 0 0; min-height: 1.2em; }
.field-hint.ok-text { color: var(--green-deep); }
.field-hint.error-text { color: var(--red); }

.chip {
    border: 2px solid #d6d9ef;
    background: var(--surface);
    color: var(--ink);
    border-radius: 999px;
    padding: 7px 16px;
    font-weight: 700;
    cursor: pointer;
    font-size: 0.9rem;
}
.chip-active { border-color: var(--primary); background: var(--primary-soft); color: var(--primary-deep); }

/* ---------- landing ---------- */
.landing {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background:
        radial-gradient(1000px 500px at 15% -10%, #d8dcff 0%, transparent 60%),
        radial-gradient(800px 400px at 100% 0%, #ffe9c9 0%, transparent 55%),
        var(--bg);
    padding: 24px;
}

.lang-float { position: fixed; top: 18px; right: 18px; }

.landing-hero { max-width: 560px; text-align: center; }
.landing-mascot { animation: float 3.2s ease-in-out infinite; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

.landing-title {
    font-size: 3.2rem;
    margin: 6px 0 2px;
    font-weight: 900;
    letter-spacing: -1px;
    background: linear-gradient(90deg, var(--primary), #9333ea);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.landing-tagline { font-size: 1.15rem; color: var(--muted); margin: 0 0 26px; }

.landing-actions { display: flex; justify-content: center; margin-bottom: 28px; }

.btn-google {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: var(--surface);
    color: var(--ink);
    font-weight: 800;
    font-size: 1.02rem;
    padding: 14px 26px;
    border-radius: 16px;
    border: 2px solid #d6d9ef;
    box-shadow: 0 4px 0 #d6d9ef;
    text-decoration: none;
    transition: transform 0.05s ease;
}
.btn-google:active { transform: translateY(2px); box-shadow: 0 1px 0 #d6d9ef; }

.setup-card {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 20px 24px;
    box-shadow: var(--shadow);
    max-width: 420px;
}
.setup-title { font-weight: 800; margin: 0 0 6px; }
.setup-text { color: var(--muted); font-size: 0.92rem; margin: 0 0 14px; }

.landing-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
}
.feature {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 14px 16px;
    display: flex;
    gap: 10px;
    align-items: flex-start;
    box-shadow: var(--shadow);
    text-align: left;
    font-size: 0.88rem;
    color: var(--muted);
}
.feature span { font-size: 1.4rem; }
.feature p { margin: 0; }

/* ---------- onboarding ---------- */
.onboarding {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: radial-gradient(900px 500px at 50% -10%, #d8dcff 0%, transparent 60%), var(--bg);
}
.onboarding-card {
    background: var(--surface);
    border-radius: 24px;
    box-shadow: var(--shadow);
    padding: 32px;
    width: 100%;
    max-width: 520px;
    text-align: center;
}
.onboarding-card h1 { margin: 8px 0 4px; }
.onboarding-mascot { display: flex; justify-content: center; }

.lang-row { display: flex; align-items: center; gap: 8px; margin: 18px 0; justify-content: center; }

.avatar-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin: 10px 0 18px;
}
.avatar-grid.small { grid-template-columns: repeat(4, 1fr); }
.avatar-option {
    border: 3px solid transparent;
    background: var(--bg);
    border-radius: 16px;
    padding: 8px 4px;
    cursor: pointer;
    transition: border-color 0.15s ease, transform 0.1s ease;
}
.avatar-option:hover { transform: translateY(-2px); }
.avatar-option.selected { border-color: var(--primary); background: var(--primary-soft); }

/* ---------- pages ---------- */
.page { max-width: 860px; margin: 0 auto; padding: 26px 18px 90px; width: 100%; box-sizing: border-box; }
.page-title { font-size: 1.8rem; font-weight: 900; margin: 0 0 4px; }
.page-subtitle { margin: 0 0 24px; }

/* ---------- worlds map ---------- */
.worlds-page { max-width: 920px; margin: 0 auto; padding: 26px 18px 90px; }
.track-title { font-size: 1.05rem; font-weight: 900; margin: 28px 0 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 1px; }
.track-title span { margin-right: 6px; }

.world-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }

.world-card {
    display: flex;
    gap: 12px;
    align-items: center;
    background: var(--surface);
    border: 2px solid transparent;
    border-radius: var(--radius);
    padding: 16px;
    cursor: pointer;
    text-align: left;
    font-family: var(--font);
    box-shadow: var(--shadow);
    transition: transform 0.12s ease, border-color 0.12s ease;
}
.world-card.available:hover { transform: translateY(-3px); border-color: var(--world-color); }
.world-card.locked { opacity: 0.62; cursor: default; }

.world-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: var(--world-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.7rem;
    flex-shrink: 0;
}

.world-info h3 { margin: 0 0 2px; font-size: 1.02rem; }
.world-info p { margin: 0 0 8px; color: var(--muted); font-size: 0.85rem; }

.world-progress { display: flex; align-items: center; gap: 8px; }
.progress-track {
    height: 12px;
    background: var(--bg-accent);
    border-radius: 999px;
    overflow: hidden;
    min-width: 60px;
}
.progress-fill { height: 100%; background: var(--green); border-radius: 999px; transition: width 0.4s ease; }
.progress-label { font-size: 0.8rem; font-weight: 800; color: var(--muted); }

.soon-badge {
    font-size: 0.8rem;
    font-weight: 800;
    color: var(--muted);
    background: var(--bg-accent);
    padding: 4px 10px;
    border-radius: 999px;
}

/* ---------- world path ---------- */
.world-page { max-width: 620px; margin: 0 auto; padding: 20px 18px 90px; }
.world-header { display: flex; align-items: center; gap: 12px; margin-bottom: 4px; }
.world-header h1 { margin: 0; font-size: 1.5rem; }
.world-header p { margin: 0; }
.world-intro { color: var(--muted); margin: 10px 0 8px; }

.btn-back {
    width: 40px; height: 40px;
    display: flex; align-items: center; justify-content: center;
    background: var(--surface);
    border-radius: 14px;
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--ink);
    text-decoration: none;
    box-shadow: var(--shadow);
}

.lesson-path { display: flex; flex-direction: column; gap: 14px; margin-top: 18px; }
.unit-title { margin: 18px 0 0; color: var(--muted); font-size: 0.95rem; text-transform: uppercase; letter-spacing: 1px; }

.path-row { display: flex; justify-content: center; }
.path-row.n0 { justify-content: flex-start; padding-left: 8%; }
.path-row.n1 { justify-content: center; }
.path-row.n2 { justify-content: flex-end; padding-right: 8%; }
.path-row.n3 { justify-content: center; }

.lesson-node {
    width: 84px;
    height: 84px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    font-family: var(--font);
    position: relative;
    background: var(--primary);
    box-shadow: 0 6px 0 var(--primary-deep);
    transition: transform 0.1s ease;
}
.lesson-node:active { transform: translateY(3px); }

.lesson-node .node-icon { font-size: 1.6rem; line-height: 1; }

.lesson-node.done { background: var(--gold); box-shadow: 0 6px 0 #b45309; }
.lesson-node.locked { background: #b9bdd4; box-shadow: 0 6px 0 #8f93ab; cursor: not-allowed; }
.lesson-node.quiz { background: #0ea5e9; box-shadow: 0 6px 0 #0369a1; }
.lesson-node.boss { width: 100px; height: 100px; background: #a855f7; box-shadow: 0 7px 0 #6b21a8; }

.lesson-node.current { animation: pulse 1.6s ease-in-out infinite; }
@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.06); }
}

.node-stars { font-size: 0.72rem; color: #fff7d6; font-weight: 900; letter-spacing: 1px; }

/* ---------- lesson player ---------- */
.lesson-shell {
    max-width: 680px;
    margin: 0 auto;
    padding: 18px 18px 110px;
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - 64px);
    box-sizing: border-box;
}

.lesson-top { display: flex; align-items: center; gap: 12px; margin-bottom: 22px; }

.exercise-area { flex: 1; display: flex; flex-direction: column; }
.exercise-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
.exercise-count { font-weight: 900; color: var(--muted); font-size: 0.9rem; }
.exercise-prompt { font-size: 1.3rem; font-weight: 800; margin: 0 0 18px; line-height: 1.35; }

.options { display: flex; flex-direction: column; gap: 10px; }
.option {
    display: flex;
    align-items: center;
    gap: 12px;
    text-align: left;
    padding: 15px 16px;
    border-radius: 16px;
    border: 2px solid #d6d9ef;
    background: var(--surface);
    color: var(--ink);
    font-family: var(--font);
    font-size: 1rem;
    cursor: pointer;
    transition: border-color 0.12s ease, background 0.12s ease;
}
.option:hover:not(:disabled) { border-color: var(--primary); }
.option.selected { border-color: var(--primary); background: var(--primary-soft); }
.option.correct { border-color: var(--green); background: #e7f9ee; }
.app-root.dark .option.correct { background: #14321f; }
.option.wrong { border-color: var(--red); background: #fdeaea; }
.app-root.dark .option.wrong { background: #3d1a1a; }

.option-letter {
    width: 30px; height: 30px;
    border-radius: 10px;
    background: var(--bg-accent);
    display: flex; align-items: center; justify-content: center;
    font-weight: 900; font-size: 0.85rem; color: var(--muted);
    flex-shrink: 0;
}
.option.correct .option-letter { background: var(--green); color: white; }
.option.wrong .option-letter { background: var(--red); color: white; }

.tf-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.tf { justify-content: center; font-weight: 800; font-size: 1.05rem; }

.code-block {
    background: var(--night);
    color: #dbe4ff;
    border-radius: 16px;
    padding: 16px 18px;
    font-size: 0.95rem;
    line-height: 1.55;
    overflow-x: auto;
    margin: 0 0 16px;
    white-space: pre-wrap;
}

.code-blank {
    background: var(--night);
    color: #dbe4ff;
    border-radius: 16px;
    padding: 16px 18px;
    font-size: 0.95rem;
    line-height: 2.1;
    white-space: pre-wrap;
}
.blank-input {
    border: none;
    border-bottom: 3px solid var(--teal);
    background: rgba(255, 255, 255, 0.08);
    color: #7ff3e3;
    font-size: 0.95rem;
    text-align: center;
    border-radius: 4px 4px 0 0;
    padding: 2px 4px;
}
.blank-input:focus { outline: none; border-bottom-color: #facc15; }

.code-editor {
    width: 100%;
    box-sizing: border-box;
    background: var(--night);
    color: #dbe4ff;
    border: 2px solid transparent;
    border-radius: 16px;
    padding: 16px 18px;
    font-size: 0.95rem;
    line-height: 1.55;
    resize: vertical;
    tab-size: 4;
}
.code-editor:focus { outline: none; border-color: var(--primary); }
.code-editor.tall { min-height: 320px; }

.code-actions { display: flex; gap: 10px; margin: 14px 0; }

.run-panel { background: var(--surface); border: 2px solid var(--bg-accent); border-radius: 16px; padding: 14px 16px; margin-bottom: 6px; }
.run-label { font-weight: 800; margin: 0 0 6px; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); }
.run-output { background: var(--night); color: #a7f3d0; border-radius: 12px; padding: 12px 14px; margin: 0 0 12px; white-space: pre-wrap; font-size: 0.9rem; }
.run-error-title { font-weight: 800; color: var(--red); margin: 0 0 6px; }
.run-diagnostics { background: #2a1520; color: #fda4af; border-radius: 12px; padding: 10px 14px; margin: 4px 0; white-space: pre-wrap; font-size: 0.85rem; }
.run-error { color: var(--red); font-weight: 700; margin: 0; }

.test-list { display: flex; flex-direction: column; gap: 6px; }
.test-row { display: flex; flex-direction: column; gap: 4px; padding: 8px 12px; border-radius: 10px; font-size: 0.9rem; font-weight: 700; }
.test-row.passed { background: #e7f9ee; color: var(--green-deep); }
.test-row.failed { background: #fdeaea; color: var(--red-deep); }
.app-root.dark .test-row.passed { background: #14321f; }
.app-root.dark .test-row.failed { background: #3d1a1a; }
.test-diff { display: flex; flex-direction: column; gap: 2px; font-weight: 400; font-size: 0.85rem; }
.test-diff code { background: rgba(0,0,0,0.08); padding: 1px 6px; border-radius: 6px; }

.feedback {
    margin-top: 16px;
    border-radius: 16px;
    padding: 16px 18px;
    font-size: 1rem;
    animation: slideUp 0.25s ease;
}
.feedback.good { background: #e7f9ee; border: 2px solid var(--green); }
.feedback.bad { background: #fdeaea; border: 2px solid var(--red); }
.app-root.dark .feedback.good { background: #14321f; }
.app-root.dark .feedback.bad { background: #3d1a1a; }
.feedback strong { display: block; margin-bottom: 4px; font-size: 1.05rem; }
.feedback p { margin: 0 0 8px; color: var(--ink); }
@keyframes slideUp { from { transform: translateY(12px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

.lesson-footer { margin-top: auto; padding-top: 22px; }

/* tip phase */
.tip-phase { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 20px; }
.tip-bubble {
    background: var(--surface);
    border-radius: 20px;
    padding: 18px 22px;
    box-shadow: var(--shadow);
    max-width: 480px;
    position: relative;
}
.tip-bubble strong { color: var(--primary-deep); }
.tip-bubble p { margin: 6px 0 0; font-size: 1.05rem; line-height: 1.5; }

/* results */
.results { align-items: center; justify-content: center; }
.results-card {
    background: var(--surface);
    border-radius: 24px;
    box-shadow: var(--shadow);
    padding: 34px;
    text-align: center;
    width: 100%;
    max-width: 420px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.results-card h1 { margin: 0; }
.results-stars .star.big { font-size: 2.6rem; color: var(--gold); letter-spacing: 6px; }
.results-xp { display: flex; flex-direction: column; gap: 8px; align-items: center; }
.xp-badge {
    background: #fef3c7;
    color: #92400e;
    font-weight: 900;
    font-size: 1.2rem;
    padding: 8px 22px;
    border-radius: 999px;
}
.streak-badge, .level-badge {
    background: #fee2e2;
    color: #b91c1c;
    font-weight: 800;
    padding: 6px 16px;
    border-radius: 999px;
    font-size: 0.95rem;
}
.level-badge { background: #ede9fe; color: #6d28d9; }

/* ---------- leaderboard ---------- */
.leaderboard { display: flex; flex-direction: column; gap: 8px; }
.lb-row {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--surface);
    border-radius: 16px;
    padding: 10px 16px;
    box-shadow: var(--shadow);
}
.lb-row.me { border: 2px solid var(--primary); }
.lb-row.separated { margin-top: 10px; }
.lb-rank {
    width: 34px; height: 34px;
    border-radius: 50%;
    background: var(--bg-accent);
    display: flex; align-items: center; justify-content: center;
    font-weight: 900;
    flex-shrink: 0;
}
.lb-rank.gold { background: #fbbf24; color: #713f12; }
.lb-rank.silver { background: #e2e8f0; color: #475569; }
.lb-rank.bronze { background: #fdba74; color: #7c2d12; }
.lb-name { font-weight: 800; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lb-level { font-size: 0.85rem; }
.lb-streak, .lb-xp { font-weight: 800; font-size: 0.9rem; white-space: nowrap; }

/* ---------- profile ---------- */
.profile-card, .profile-section {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px 22px;
    margin-bottom: 16px;
}
.profile-id { display: flex; align-items: center; gap: 16px; }
.profile-id h2 { margin: 0 0 4px; }
.profile-id p { margin: 0; }
.profile-section h3 { margin: 0 0 6px; }
.pref-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    gap: 12px;
}
.pref-row + .pref-row { border-top: 1px solid var(--bg-accent); }
.profile-actions { display: flex; gap: 10px; margin-top: 6px; }

/* ---------- Bit chat drawer ---------- */
.bit-drawer-backdrop {
    position: fixed; inset: 0;
    background: rgba(23, 26, 51, 0.4);
    z-index: 90;
    animation: fadeIn 0.15s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.bit-drawer {
    position: fixed;
    right: 16px;
    bottom: 16px;
    width: min(400px, calc(100vw - 32px));
    max-height: min(620px, calc(100vh - 90px));
    background: var(--surface);
    border-radius: 22px;
    box-shadow: 0 18px 50px rgba(23, 26, 51, 0.35);
    z-index: 100;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    animation: slideUp 0.2s ease;
}

.bit-drawer-head {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: linear-gradient(90deg, var(--primary-soft), transparent);
}
.bit-drawer-title { flex: 1; display: flex; flex-direction: column; }
.bit-drawer-title strong { font-size: 1.05rem; }
.bit-drawer-title .muted { font-size: 0.8rem; }

.bit-messages { flex: 1; overflow-y: auto; padding: 14px 16px; display: flex; flex-direction: column; gap: 10px; }

.bit-msg { max-width: 88%; }
.bit-msg-bit { align-self: flex-start; }
.bit-msg-user { align-self: flex-end; }
.bit-msg-user p {
    margin: 0;
    background: var(--primary);
    color: white;
    padding: 10px 14px;
    border-radius: 16px 16px 4px 16px;
}
.bit-bubble {
    background: var(--bg);
    border-radius: 16px 16px 16px 4px;
    padding: 10px 14px;
}
.bit-text { margin: 0; font-family: var(--font); white-space: pre-wrap; font-size: 0.95rem; line-height: 1.45; }
.bit-msg-actions { display: flex; justify-content: flex-end; margin-top: 4px; }

.typing { display: flex; gap: 5px; padding: 14px 16px; }
.typing span {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--muted);
    animation: blink 1.2s infinite;
}
.typing span:nth-child(2) { animation-delay: 0.2s; }
.typing span:nth-child(3) { animation-delay: 0.4s; }
@keyframes blink { 0%, 80%, 100% { opacity: 0.25; } 40% { opacity: 1; } }

.bit-hints { padding: 0 16px 8px; display: flex; flex-direction: column; gap: 6px; }
.hint-line {
    background: #fef3c7;
    color: #78350f;
    border-radius: 12px;
    padding: 8px 12px;
    font-size: 0.88rem;
}
.app-root.dark .hint-line { background: #3a3117; color: #fde68a; }

.bit-input-row { display: flex; gap: 8px; padding: 12px 16px 16px; }
.bit-input-row .text-input { flex: 1; }
.bit-input-row .btn { padding: 10px 16px; }

/* ---------- modal ---------- */
.modal-backdrop {
    position: fixed; inset: 0;
    background: rgba(23, 26, 51, 0.45);
    z-index: 120;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}
.modal {
    background: var(--surface);
    border-radius: 22px;
    padding: 26px;
    width: 100%;
    max-width: 380px;
    box-shadow: 0 18px 50px rgba(23, 26, 51, 0.4);
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.modal h3 { margin: 0; }

/* ---------- Bit mascot animations ---------- */
.bit-pose-idle { animation: bitFloat 3s ease-in-out infinite; }
.bit-pose-cheer { animation: bitCheer 0.7s ease-in-out infinite; }
.bit-pose-wave .bit-arm-wave { animation: bitWaveArm 0.5s ease-in-out infinite; transform-origin: 128px 115px; }
.bit-pose-sleep { animation: none; }
.bit-antenna { animation: bitBlink 2.4s ease-in-out infinite; }
.bit-chest-light { animation: bitBlink 1.6s ease-in-out infinite; }
.bit-mouth-talk { animation: bitTalk 0.35s ease-in-out infinite; transform-origin: 100px 90px; }
.bit-mouth-oval { animation: bitTalk 0.35s ease-in-out infinite; }

@keyframes bitFloat { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-4px); } }
@keyframes bitCheer { 0%, 100% { transform: translateY(0) scale(1); } 40% { transform: translateY(-8px) scale(1.04); } }
@keyframes bitWaveArm { 0%, 100% { transform: rotate(-45deg); } 50% { transform: rotate(-70deg); } }
@keyframes bitBlink { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }
@keyframes bitTalk { 0%, 100% { transform: scaleY(1); } 50% { transform: scaleY(0.55); } }

/* ---------- responsive ---------- */
@media (max-width: 720px) {
    .topbar { padding: 8px 12px; }
    .brand-name { display: none; }
    .avatar-name { display: none; }
    .topbar-stats { gap: 6px; }
    .stat-chip { padding: 5px 9px; font-size: 0.78rem; }

    .bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0; left: 0; right: 0;
        background: var(--surface);
        box-shadow: 0 -4px 20px rgba(30, 35, 64, 0.12);
        z-index: 50;
    }
    .nav-item {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 2px;
        padding: 8px 4px 10px;
        text-decoration: none;
        color: var(--muted);
        font-size: 0.68rem;
        font-weight: 800;
    }
    .nav-item.active { color: var(--primary); }
    .nav-icon { font-size: 1.3rem; }

    .page, .worlds-page, .world-page, .lesson-shell { padding-bottom: 110px; }
    .lesson-node { width: 72px; height: 72px; }
    .lesson-node.boss { width: 86px; height: 86px; }
}

/* ============================================================
   Phase 2: gamification styles
   ============================================================ */

.stat-hearts { background: #fee2e2; color: #b91c1c; }
.app-root.dark .stat-hearts { background: #3d1d1d; color: #fca5a5; }
.stat-gems { background: #d1fae5; color: #065f46; }
.app-root.dark .stat-gems { background: #0d2e22; color: #6ee7b7; }

.combo-chip {
    background: linear-gradient(90deg, #f97316, #ef4444);
    color: white;
    animation: comboPop 0.3s ease;
}
@keyframes comboPop { from { transform: scale(0.7); } to { transform: scale(1); } }

.icon-btn.wide { width: auto; padding: 0 12px; }

.home-header { display: flex; justify-content: space-between; align-items: flex-end; gap: 12px; }
.home-actions { display: flex; gap: 8px; }

.weekend-banner {
    background: linear-gradient(90deg, #7c3aed, #db2777);
    color: white;
    font-weight: 900;
    text-align: center;
    padding: 12px 18px;
    border-radius: 16px;
    margin-bottom: 18px;
    animation: float 2.4s ease-in-out infinite;
}

.daily-card {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 18px 20px;
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.daily-goal { display: flex; align-items: center; gap: 10px; font-weight: 800; }
.progress-fill.goal-done { background: var(--gold); }

.quests { display: flex; flex-direction: column; gap: 8px; }
.quest-row {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--bg);
    border-radius: 12px;
    padding: 8px 12px;
}
.quest-row.claimed { opacity: 0.55; }
.quest-icon { font-size: 1.1rem; }
.quest-info { flex: 1; display: flex; flex-direction: column; gap: 4px; font-size: 0.88rem; font-weight: 700; }
.quest-reward { font-weight: 800; font-size: 0.85rem; color: var(--green-deep); }
.quest-progress { font-size: 0.8rem; font-weight: 800; color: var(--muted); min-width: 36px; text-align: right; }
.quest-check { color: var(--green); font-weight: 900; }

.feature-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 18px; }
.feature-card {
    background: var(--surface);
    border: 2px solid transparent;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 14px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    cursor: pointer;
    font-family: var(--font);
    text-align: left;
    color: var(--ink);
    transition: transform 0.12s ease, border-color 0.12s ease;
}
.feature-card:hover { transform: translateY(-3px); border-color: var(--primary); }
.feature-card span { font-size: 1.5rem; }
.feature-card strong { font-size: 0.95rem; }
.feature-card small { font-size: 0.75rem; }
.feature-card.challenge.done { opacity: 0.6; }

.boss-hp { display: flex; align-items: center; gap: 6px; }
.boss-hp-icon { font-size: 1.1rem; }
.boss-hp-track {
    width: 110px;
    height: 12px;
    background: var(--bg-accent);
    border-radius: 999px;
    overflow: hidden;
}
.boss-hp-fill { height: 100%; background: linear-gradient(90deg, #a855f7, #ec4899); transition: width 0.4s ease; }

.boss-intro { position: relative; animation: bitFloat 1.6s ease-in-out infinite; }
.boss-crown { position: absolute; top: -14px; left: 50%; transform: translateX(-50%); font-size: 2rem; }
.boss-bubble { border: 3px solid #a855f7; }
.btn-danger { background: #ef4444; color: white; box-shadow: 0 4px 0 #b91c1c; }

.hearts-timer { font-size: 1.4rem; font-weight: 900; color: #b91c1c; }

.nudge-chip {
    display: block;
    margin: 0 auto 14px;
    background: var(--primary-soft);
    color: var(--primary-deep);
    border: 2px solid var(--primary);
    border-radius: 999px;
    padding: 8px 18px;
    font-weight: 800;
    font-family: var(--font);
    cursor: pointer;
    animation: nudgePulse 1.4s ease-in-out infinite;
}
@keyframes nudgePulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.05); } }

.parsons { display: flex; flex-direction: column; gap: 12px; }
.parsons-label { font-weight: 800; margin: 0; }
.parsons-answer {
    min-height: 60px;
    background: var(--night);
    border-radius: 16px;
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.parsons-empty { color: #64748b; font-size: 0.9rem; }
.parsons-pool { display: flex; flex-direction: column; gap: 6px; }
.parsons-line {
    background: #1e293b;
    color: #dbe4ff;
    border: 2px solid #334155;
    border-radius: 10px;
    padding: 9px 12px;
    font-size: 0.88rem;
    text-align: left;
    cursor: pointer;
    font-family: inherit;
}
.parsons-line:hover:not(:disabled) { border-color: var(--teal); }
.parsons-answer .parsons-line { border-color: var(--teal); cursor: pointer; }

.match-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.match-col { display: flex; flex-direction: column; gap: 8px; }
.match-card {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--surface);
    border: 2px solid #d6d9ef;
    border-radius: 14px;
    padding: 12px 14px;
    cursor: pointer;
    font-family: var(--font);
    font-size: 0.92rem;
    text-align: left;
    color: var(--ink);
    min-height: 52px;
}
.match-card:hover:not(:disabled) { border-color: var(--primary); }
.match-card.picked { border-color: var(--primary); background: var(--primary-soft); }
.match-card.paired { border-color: var(--teal); background: rgba(45, 212, 191, 0.08); }
.match-badge {
    min-width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--teal);
    color: #042f2e;
    font-weight: 900;
    font-size: 0.75rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.bugfix-banner {
    background: #fef3c7;
    color: #92400e;
    border-radius: 12px;
    padding: 10px 14px;
    font-weight: 700;
    margin: 0 0 12px;
}
.app-root.dark .bugfix-banner { background: #3a3117; color: #fde68a; }

.shop-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.shop-card {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.shop-card h3 { margin: 0; }
.shop-card p { margin: 0; font-size: 0.88rem; flex: 1; }
.shop-icon { font-size: 2.2rem; }
.shop-owned { font-weight: 800; }

.ach-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 10px; }
.ach-card {
    display: flex;
    gap: 12px;
    background: var(--surface);
    border-radius: 16px;
    padding: 14px;
    box-shadow: var(--shadow);
    opacity: 0.5;
}
.ach-card.unlocked { opacity: 1; border: 2px solid var(--gold); }
.ach-icon { font-size: 1.8rem; }
.ach-card h3 { margin: 0 0 2px; font-size: 0.95rem; }
.ach-card p { margin: 0; font-size: 0.8rem; }
.ach-reward { font-weight: 800; font-size: 0.78rem !important; color: var(--green-deep); margin-top: 4px !important; }

.lightning-worlds { display: flex; flex-direction: column; gap: 10px; }
.lightning-world-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--surface);
    border: 2px solid transparent;
    border-radius: 16px;
    box-shadow: var(--shadow);
    padding: 14px 18px;
    font-family: var(--font);
    font-weight: 800;
    font-size: 1rem;
    color: var(--ink);
    cursor: pointer;
    text-align: left;
}
.lightning-world-btn:hover { border-color: var(--world-color); transform: translateY(-2px); }
.progress-fill.lightning { background: linear-gradient(90deg, #f97316, #ef4444); }
.lightning-flash { text-align: center; font-size: 1.4rem; font-weight: 900; margin-top: 10px; }
.lightning-flash.good { color: var(--green); }
.lightning-flash