:root {
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-input: #0f172a;
    --border: #334155;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --primary: #ec4899;
    --primary-glow: rgba(236, 72, 153, 0.35);
    --success: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.15);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.15);
    --radius: 16px;
    --radius-sm: 10px;
    --shadow-lg: 0 20px 50px rgba(0,0,0,0.4);
    --transition: all 0.15s ease;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', -apple-system, sans-serif;
}

.login-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 40px 32px;
    width: 100%;
    max-width: 380px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
}
.login-brand {
    text-align: center;
    font-size: 28px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), #f472b6);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 8px;
}
.login-sub { text-align: center; color: var(--text-muted); font-size: 14px; margin-bottom: 28px; }
.login-form { display: flex; flex-direction: column; gap: 14px; }
.login-form label { font-size: 13px; color: var(--text-muted); font-weight: 500; }
.login-form input {
    width: 100%; padding: 12px 14px; background: var(--bg-input);
    border: 1px solid var(--border); border-radius: var(--radius-sm);
    color: var(--text); font-size: 15px; font-family: inherit;
}
.login-form input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-glow); }
.login-form button, .btn {
    margin-top: 8px; padding: 13px; background: linear-gradient(135deg, var(--primary), #f472b6);
    color: white; border: none; border-radius: var(--radius-sm);
    font-size: 15px; font-weight: 600; font-family: inherit; cursor: pointer;
}
.btn.secondary { background: var(--bg-card); border: 1px solid var(--border); }
.login-form button:disabled, .btn:disabled { opacity: 0.6; cursor: not-allowed; }
.login-error {
    background: var(--danger-bg); color: var(--danger); padding: 10px 14px;
    border-radius: var(--radius-sm); font-size: 13px; text-align: center; display: none;
}
.login-error.show { display: block; }

.app { max-width: 640px; margin: 0 auto; padding: 20px; }
.topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.brand { font-size: 20px; font-weight: 800; background: linear-gradient(135deg, var(--primary), #f472b6);
    -webkit-background-clip: text; background-clip: text; color: transparent; }

.together-banner {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 16px; margin-bottom: 20px; display: flex; justify-content: space-between; align-items: center;
}

.modules { display: grid; grid-template-columns: 1fr; gap: 12px; margin-bottom: 20px; }
.module-card {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 18px; cursor: pointer; transition: var(--transition);
}
.module-card:hover { border-color: var(--primary); }
.module-card h3 { margin: 0 0 4px; }
.module-card p { margin: 0; color: var(--text-muted); font-size: 13px; }

.card {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 32px; text-align: center; min-height: 200px; display: flex; flex-direction: column;
    justify-content: center; gap: 16px;
}
.card .prompt { font-size: 26px; font-weight: 700; }
.card .answer { font-size: 18px; color: var(--primary); display: none; }
.card .answer.show { display: block; }
.card .example { font-size: 14px; color: var(--text-muted); font-style: italic; }

.actions { display: flex; gap: 12px; margin-top: 16px; }
.actions button { flex: 1; }
.btn-wrong { background: var(--danger-bg); color: var(--danger); border: 1px solid var(--danger); }
.btn-right { background: var(--success-bg); color: var(--success); border: 1px solid var(--success); }

.hidden { display: none !important; }
.center { text-align: center; }
.muted { color: var(--text-muted); }

.debrief-row { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid var(--border); }
.debrief-row:last-child { border-bottom: none; }

.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 20px; }
.stat-box {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm);
    padding: 14px 10px; text-align: center;
}
.stat-value { font-size: 22px; font-weight: 800; color: var(--primary); }
.stat-label { font-size: 11px; color: var(--text-muted); margin-top: 4px; }

.heatmap { margin-bottom: 24px; }
.heatmap-grid {
    display: grid; grid-template-columns: repeat(21, 1fr); gap: 3px;
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px;
}
.heatmap-cell { aspect-ratio: 1; border-radius: 2px; background: var(--border); }
.heatmap-cell.level-1 { background: #4a1d3a; }
.heatmap-cell.level-2 { background: #7a2960; }
.heatmap-cell.level-3 { background: #c23e8a; }
.heatmap-cell.level-4 { background: var(--primary); }

.module-progress h3 { margin: 0 0 12px; font-size: 15px; color: var(--text-muted); }
.module-progress-row { margin-bottom: 14px; }
.module-progress-label { font-size: 14px; margin-bottom: 6px; display: flex; justify-content: space-between; }
.progress-bar { height: 8px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 4px; overflow: hidden; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--primary), #f472b6); }

/* ========================================
   HOME / DASHBOARD
   ======================================== */
.home { display: flex; flex-direction: column; gap: 1.8rem; max-width: 1080px; margin: 0 auto; padding: 0.5rem 0 2rem; }

.home-hero {
    position: relative; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem;
    padding: 2.4rem 2.2rem; border-radius: 28px;
    background:
        radial-gradient(ellipse at top left, rgba(236, 72, 153, 0.18), transparent 60%),
        radial-gradient(ellipse at bottom right, rgba(244, 114, 182, 0.12), transparent 60%),
        linear-gradient(145deg, #1e1030 0%, #170c26 100%);
    border: 1px solid rgba(148, 163, 184, 0.1);
    overflow: hidden;
}
.home-hero-bg {
    position: absolute; inset: 0;
    background-image: repeating-linear-gradient(135deg, transparent 0, transparent 22px, rgba(244, 114, 182, 0.03) 22px, rgba(244, 114, 182, 0.03) 23px);
    pointer-events: none;
}
.home-hero-left { position: relative; z-index: 1; }
.home-greeting {
    display: flex; align-items: baseline; gap: 0.6rem; margin-bottom: 1.2rem;
    font-family: 'JetBrains Mono', monospace; font-size: 0.8rem; text-transform: uppercase;
    letter-spacing: 0.15em; color: var(--text-muted);
}
.home-greeting-label::after { content: " ·"; opacity: 0.4; margin-left: 0.3rem; }
.home-greeting-name { color: #fbbf24; font-weight: 500; }
.home-streak-value { display: flex; align-items: flex-start; gap: 0.6rem; line-height: 0.85; }
.home-streak-number {
    font-family: 'Fraunces', Georgia, serif; font-size: clamp(4.5rem, 11vw, 7rem); font-weight: 900;
    font-variation-settings: 'opsz' 144; letter-spacing: -0.04em;
    background: linear-gradient(180deg, #f1f5f9 0%, #cbd5e1 60%, #94a3b8 100%);
    -webkit-background-clip: text; background-clip: text; color: transparent; display: inline-block;
}
.home-streak-flame {
    color: #fbbf24; width: 1.6rem; height: 1.6rem; margin-top: 0.8rem;
    filter: drop-shadow(0 0 14px rgba(251, 191, 36, 0.5)); animation: flameFlicker 2.5s ease-in-out infinite;
}
.home-streak-flame svg { width: 100%; height: 100%; }
@keyframes flameFlicker {
    0%, 100% { transform: scale(1) rotate(-2deg); opacity: 1; }
    25% { transform: scale(1.08) rotate(1deg); opacity: 0.9; }
    50% { transform: scale(0.98) rotate(-1deg); opacity: 1; }
    75% { transform: scale(1.04) rotate(2deg); opacity: 0.95; }
}
.home-streak-label {
    font-family: 'JetBrains Mono', monospace; font-size: 0.75rem; text-transform: uppercase;
    letter-spacing: 0.2em; color: var(--text-muted); margin-top: 0.6rem; margin-left: 0.2rem;
}
.home-hero-right { position: relative; z-index: 1; }
.home-ring { position: relative; width: 140px; height: 140px; }
.home-ring svg { display: block; }
.home-ring-bg { stroke: rgba(148, 163, 184, 0.14); }
.home-ring-fg {
    stroke-dasharray: 377; stroke-dashoffset: 377;
    transition: stroke-dashoffset 1.2s cubic-bezier(0.4, 0, 0.2, 1);
    filter: drop-shadow(0 0 8px rgba(236, 72, 153, 0.35));
}
.home-ring-center { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; pointer-events: none; }
.home-ring-num { font-family: 'Fraunces', Georgia, serif; font-size: 1.75rem; font-weight: 700; color: var(--text); line-height: 1; }
.home-ring-sep { color: var(--text-muted); font-weight: 400; margin: 0 0.1rem; }
.home-ring-label { font-family: 'JetBrains Mono', monospace; font-size: 0.62rem; text-transform: uppercase; letter-spacing: 0.15em; color: var(--text-muted); margin-top: 0.3rem; }

.home-action { display: grid; grid-template-columns: 1.4fr 1fr; gap: 1.4rem; }
.home-cta {
    position: relative; overflow: hidden; border: 0; border-radius: 22px; padding: 1.8rem 2rem; cursor: pointer;
    text-align: left; background: linear-gradient(135deg, #ec4899 0%, #f472b6 50%, #fb7185 100%); color: white;
    transition: transform 0.4s cubic-bezier(0.4,0,0.2,1), box-shadow 0.4s cubic-bezier(0.4,0,0.2,1);
    box-shadow: 0 14px 40px -12px rgba(236, 72, 153, 0.55); font-family: inherit; width: 100%;
}
.home-cta::before {
    content: ""; position: absolute; inset: 0;
    background-image: radial-gradient(circle at 80% 20%, rgba(255,255,255,0.18) 0, transparent 40%),
        radial-gradient(circle at 20% 80%, rgba(255,255,255,0.12) 0, transparent 50%);
    pointer-events: none;
}
.home-cta:hover { transform: translateY(-4px); box-shadow: 0 22px 60px -14px rgba(236, 72, 153, 0.7); }
.home-cta-inner { position: relative; z-index: 1; display: flex; justify-content: space-between; align-items: center; gap: 1.5rem; }
.home-cta-label { display: flex; flex-direction: column; gap: 0.35rem; }
.home-cta-title { font-family: 'Fraunces', Georgia, serif; font-size: 1.6rem; font-weight: 700; line-height: 1.1; letter-spacing: -0.015em; }
.home-cta-sub { font-family: 'JetBrains Mono', monospace; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.12em; color: rgba(255,255,255,0.75); }
.home-cta-icon {
    width: 56px; height: 56px; border-radius: 50%; background: rgba(255,255,255,0.18); backdrop-filter: blur(6px);
    display: flex; align-items: center; justify-content: center; flex-shrink: 0;
    transition: transform 0.4s cubic-bezier(0.4,0,0.2,1);
}
.home-cta-icon svg { width: 22px; height: 22px; }
.home-cta:hover .home-cta-icon { transform: translateX(6px) rotate(-8deg); }
.home-cta-shine {
    position: absolute; top: 0; left: -100%; width: 60%; height: 100%;
    background: linear-gradient(110deg, transparent 40%, rgba(255,255,255,0.22) 50%, transparent 60%);
    transform: skewX(-20deg); transition: left 0.8s ease; pointer-events: none;
}
.home-cta:hover .home-cta-shine { left: 120%; }

.home-week { background: var(--bg-card); border: 1px solid rgba(148,163,184,0.1); border-radius: 22px; padding: 1.5rem 1.4rem; display: flex; flex-direction: column; justify-content: space-between; }
.home-week-label { font-family: 'JetBrains Mono', monospace; font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.15em; color: var(--text-muted); margin-bottom: 1rem; }
.home-week-cells { display: grid; grid-template-columns: repeat(7, 1fr); gap: 0.5rem; }
.home-week-cell {
    aspect-ratio: 1; border-radius: 10px; background: rgba(148,163,184,0.08);
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    position: relative; transition: var(--transition); cursor: default;
}
.home-week-cell.active { background: linear-gradient(135deg, rgba(236,72,153,0.35), rgba(236,72,153,0.15)); border: 1px solid rgba(236,72,153,0.45); box-shadow: 0 0 12px -4px rgba(236,72,153,0.4); }
.home-week-cell.today { outline: 2px solid #fbbf24; outline-offset: 2px; }
.home-week-day { font-family: 'JetBrains Mono', monospace; font-size: 0.58rem; text-transform: uppercase; color: var(--text-muted); letter-spacing: 0.1em; }
.home-week-dot { font-size: 0.9rem; font-weight: 600; color: var(--text-muted); margin-top: 0.15rem; }
.home-week-cell.active .home-week-dot { color: #fbbf24; }
.home-week-cell.active .home-week-day { color: #fbbf24; }

.home-duel-banner {
    display: flex; align-items: center; gap: 1rem; padding: 1.1rem 1.1rem 1.1rem 1.2rem; border-radius: 14px;
    background: linear-gradient(135deg, rgba(236,72,153,0.13) 0%, rgba(236,72,153,0.04) 100%);
    border: 1px solid rgba(236,72,153,0.22); cursor: pointer; position: relative; overflow: hidden;
    transition: border-color 0.15s, background 0.15s, transform 0.12s;
}
.home-duel-banner::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, var(--primary), rgba(236,72,153,0.3)); }
.home-duel-banner:hover { border-color: rgba(236,72,153,0.4); background: linear-gradient(135deg, rgba(236,72,153,0.18) 0%, rgba(236,72,153,0.06) 100%); transform: translateY(-1px); }
.home-duel-left { flex: 1; min-width: 0; }
.home-duel-label { font-family: 'JetBrains Mono', monospace; font-size: 0.58rem; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-muted); margin-bottom: 0.25rem; }
.home-duel-title { font-family: 'Fraunces', Georgia, serif; font-size: 1.15rem; font-weight: 600; color: var(--text); line-height: 1.2; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.home-duel-sub { font-family: 'JetBrains Mono', monospace; font-size: 0.62rem; color: var(--text-muted); margin-top: 0.2rem; }
.home-duel-score { font-family: 'Fraunces', Georgia, serif; font-size: 1.5rem; font-weight: 700; color: #f472b6; white-space: nowrap; flex-shrink: 0; }
.home-duel-arrow { width: 18px; height: 18px; color: rgba(148,163,184,0.3); flex-shrink: 0; transition: color 0.15s, transform 0.15s; }
.home-duel-banner:hover .home-duel-arrow { color: rgba(148,163,184,0.6); transform: translateX(3px); }

.home-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; }
.home-stat-card { background: var(--bg-card); border: 1px solid rgba(148,163,184,0.1); border-radius: 22px; padding: 1.5rem 1.6rem 1.4rem; transition: var(--transition); position: relative; overflow: hidden; }
.home-stat-card::after { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px; opacity: 0.8; }
.home-stat-mastered::after { background: linear-gradient(90deg, #22c55e, #86efac); }
.home-stat-learning::after { background: linear-gradient(90deg, #fbbf24, #fde68a); }
.home-stat-new::after { background: linear-gradient(90deg, #a78bfa, #c4b5fd); }
.home-stat-card:hover { transform: translateY(-3px); border-color: rgba(148,163,184,0.2); }
.home-stat-head { display: flex; align-items: center; gap: 0.55rem; margin-bottom: 0.8rem; }
.home-stat-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.home-stat-mastered .home-stat-dot { background: #22c55e; box-shadow: 0 0 10px #22c55e; }
.home-stat-learning .home-stat-dot { background: #fbbf24; box-shadow: 0 0 10px #fbbf24; }
.home-stat-new .home-stat-dot { background: #a78bfa; box-shadow: 0 0 10px #a78bfa; }
.home-stat-label { font-family: 'JetBrains Mono', monospace; font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.15em; color: var(--text-muted); font-weight: 500; }
.home-stat-value { font-family: 'Fraunces', Georgia, serif; font-size: 3.2rem; font-weight: 700; font-variation-settings: 'opsz' 144; letter-spacing: -0.03em; line-height: 1; color: var(--text); margin-bottom: 0.8rem; }
.home-stat-bar { height: 4px; background: rgba(148,163,184,0.12); border-radius: 4px; overflow: hidden; margin-bottom: 0.6rem; }
.home-stat-bar-fill { height: 100%; border-radius: 4px; transition: width 1.4s cubic-bezier(0.4,0,0.2,1); }
.home-stat-mastered .home-stat-bar-fill { background: linear-gradient(90deg, #22c55e, #86efac); }
.home-stat-learning .home-stat-bar-fill { background: linear-gradient(90deg, #fbbf24, #fde68a); }
.home-stat-new .home-stat-bar-fill { background: linear-gradient(90deg, #a78bfa, #c4b5fd); }
.home-stat-hint { font-size: 0.72rem; color: var(--text-muted); font-weight: 500; }

.home-section-header { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 1rem; }
.home-section-header h2 { font-family: 'Fraunces', Georgia, serif; font-size: 1.4rem; font-weight: 700; letter-spacing: -0.02em; color: var(--text); margin: 0; }
.home-link { background: transparent; border: 0; color: var(--text-muted); font-family: 'JetBrains Mono', monospace; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.12em; cursor: pointer; transition: var(--transition); }
.home-link:hover { color: #fbbf24; }

.stats-heatmap-wrap { display: flex; gap: 6px; align-items: flex-start; overflow-x: auto; padding-bottom: 4px; }
.stats-heatmap-days { display: flex; flex-direction: column; gap: 3px; padding-top: 4px; }
.stats-heatmap-days span { font-family: 'JetBrains Mono', monospace; font-size: 0.6rem; color: var(--text-muted); height: 13px; line-height: 13px; text-align: right; padding-right: 4px; white-space: nowrap; }
.stats-heatmap-grid { display: flex; flex-direction: row; gap: 3px; }
.stats-hm-week { display: flex; flex-direction: column; gap: 3px; }
.stats-hm-cell { width: 13px; height: 13px; border-radius: 3px; cursor: default; transition: transform 0.15s ease; }
.stats-hm-cell:hover { transform: scale(1.35); }
.stats-hm-cell[data-level="0"] { background: rgba(148,163,184,0.1); }
.stats-hm-cell[data-level="1"] { background: #4a1d3a; }
.stats-hm-cell[data-level="2"] { background: #7a2960; }
.stats-hm-cell[data-level="3"] { background: #c23e8a; }
.stats-hm-cell[data-level="4"] { background: var(--primary); }

@media (max-width: 820px) {
    .home-hero { grid-template-columns: 1fr; gap: 1.5rem; padding: 1.8rem 1.6rem; }
    .home-hero-right { justify-self: flex-start; }
    .home-action { grid-template-columns: 1fr; }
    .home-stats { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
    .home { gap: 1.3rem; padding: 0.3rem 0 1.5rem; }
    .home-hero { padding: 1.6rem 1.3rem; border-radius: 22px; }
    .home-streak-number { font-size: 5.5rem; }
    .home-cta { padding: 1.4rem 1.4rem; }
    .home-cta-title { font-size: 1.3rem; }
    .home-stat-value { font-size: 2.6rem; }
    .home-section-header h2 { font-size: 1.2rem; }
}

.setup-row { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.toggle-group { display: flex; gap: 6px; flex-wrap: wrap; }
.toggle-btn {
    padding: 8px 14px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm);
    color: var(--text); font-size: 13px; cursor: pointer; font-family: inherit;
}
.toggle-btn.active { background: linear-gradient(135deg, var(--primary), #f472b6); border-color: transparent; color: white; }