/* Dragon Hoard Division - Mobile-First Styles */

:root {
    --dragon-red: #DC2626;
    --dragon-orange: #EA580C;
    --dragon-gold: #F59E0B;
    --bg-primary: linear-gradient(135deg, #1a0a0a 0%, #2d1810 50%, #1a0f0a 100%);
    --bg-card: rgba(255, 100, 50, 0.08);
    --glass-bg: rgba(30, 20, 15, 0.7);
    --glass-border: rgba(255, 150, 100, 0.2);
    --text-primary: #FEF3E2;
    --text-secondary: #D4A574;
    --text-muted: #A67C52;
    --success: #22C55E;
    --error: #EF4444;
    --division-bg: #FEFEFE;
    --division-text: #1a1a1a;
    --division-line: #333;
    --input-bg: #FFF9E6;
    --input-border: #F59E0B;
    --cell-size: 2rem;
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --touch-min: 44px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

.game-container {
    max-width: 480px;
    margin: 0 auto;
    padding: var(--space-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.game-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.back-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    min-height: var(--touch-min);
    display: flex;
    align-items: center;
}

.game-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--dragon-gold);
}

/* Screens */
.screen {
    display: none;
    flex-direction: column;
    gap: var(--space-md);
    flex: 1;
}

.screen.active { display: flex; }

/* Dragon */
.dragon-avatar {
    font-size: 3rem;
    text-align: center;
    animation: float 3s ease-in-out infinite;
}

.dragon-avatar.small { font-size: 1.75rem; }
.dragon-avatar.large { font-size: 4rem; }

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.dragon-intro, .dragon-companion, .dragon-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    text-align: center;
}

.dragon-companion {
    flex-direction: row;
    gap: var(--space-sm);
}

.speech-bubble {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
}

.speech-bubble.small { padding: var(--space-xs) var(--space-sm); flex: 1; }

.dragon-speech {
    color: var(--text-primary);
    font-style: italic;
    font-size: 0.85rem;
}

/* Welcome */
.welcome-content {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
}

.welcome-content h2 { color: var(--dragon-gold); font-size: 1.1rem; margin-bottom: var(--space-sm); }
.welcome-content p { color: var(--text-secondary); font-size: 0.85rem; margin-bottom: var(--space-sm); }

.instructions-list { list-style: none; counter-reset: list-item; margin-bottom: var(--space-md); }
.instructions-list li {
    padding: var(--space-xs) 0;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.85rem;
}
.instructions-list li::before {
    content: counter(list-item);
    counter-increment: list-item;
    background: var(--dragon-orange);
    color: white;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 600;
}

.stage-preview { margin-top: var(--space-md); padding-top: var(--space-md); border-top: 1px solid var(--glass-border); }
.stage-preview h3 { color: var(--text-secondary); font-size: 0.75rem; text-transform: uppercase; margin-bottom: var(--space-sm); }
.stage-list { display: flex; flex-direction: column; gap: 2px; }
.stage-item { display: flex; align-items: center; gap: var(--space-sm); padding: 2px; font-size: 0.8rem; }
.stage-item.unlocked { color: var(--text-primary); }
.stage-item.locked { color: var(--text-muted); opacity: 0.6; }
.stage-icon { font-size: 1rem; }

.welcome-buttons { display: flex; flex-direction: column; gap: var(--space-sm); margin-top: auto; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    min-height: var(--touch-min);
    font-size: 1rem;
    font-weight: 600;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: 0.2s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--dragon-orange), var(--dragon-red));
    color: white;
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    border-color: var(--glass-border);
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border-color: var(--glass-border);
}

.btn-hint {
    background: rgba(245, 158, 11, 0.2);
    color: var(--dragon-gold);
    border-color: rgba(245, 158, 11, 0.3);
}

.btn-large { padding: var(--space-lg) var(--space-xl); }
.btn-small { padding: var(--space-sm) var(--space-md); font-size: 0.85rem; min-height: 36px; }

/* Stage Select */
.stage-buttons { display: flex; flex-direction: column; gap: var(--space-sm); }
.stage-btn {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    text-align: left;
    cursor: pointer;
}
.stage-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.stage-btn .stage-icon { font-size: 1.5rem; }
.stage-btn-info { flex: 1; }
.stage-btn-name { font-weight: 600; font-size: 0.9rem; display: block; }
.stage-btn-desc { font-size: 0.75rem; color: var(--text-secondary); }
.stage-btn-status { font-size: 0.7rem; color: var(--dragon-gold); }

/* Stats Bar */
.stats-bar {
    display: flex;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-md);
    background: var(--glass-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--glass-border);
}

.stat { display: flex; flex-direction: column; align-items: center; }
.stat-label { font-size: 0.6rem; color: var(--text-muted); text-transform: uppercase; }
.stat-value { font-size: 0.85rem; font-weight: 600; }

/* ============================================
   DIVISION DISPLAY - Grid-based layout
   ============================================ */
.division-container {
    background: var(--division-bg);
    border-radius: var(--radius-lg);
    padding: var(--space-lg) var(--space-md);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    overflow-x: auto;
}

.division-display {
    font-family: 'Courier New', Courier, monospace;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--division-text);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: fit-content;
}

/* Two-column division layout */
.division-layout {
    display: flex;
    align-items: flex-start;
}

/* Left column: divisor and bracket */
.division-left {
    display: flex;
    flex-direction: column;
}

.divisor-spacer {
    height: var(--cell-size);
}

.divisor-bracket {
    display: flex;
    align-items: center;
    height: var(--cell-size);
}

.divisor {
    text-align: right;
    padding-right: 4px;
}

.bracket {
    font-size: 1.4em;
    line-height: 1;
}

/* Right column: quotient, dividend, working */
.division-right {
    display: flex;
    flex-direction: column;
}

/* Quotient row */
.quotient-row {
    display: flex;
    height: var(--cell-size);
}

.q-cell {
    width: var(--cell-size);
    height: var(--cell-size);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--dragon-red);
    font-weight: 700;
}

.q-cell.empty { color: transparent; }
.q-cell.filled { color: var(--dragon-red); }
.q-cell.remainder {
    color: var(--text-muted);
    font-size: 0.8em;
    width: auto;
    padding: 0 2px;
}
.q-cell.remainder-value {
    color: var(--dragon-gold);
}

.q-cell.input {
    width: var(--cell-size);
    height: var(--cell-size);
    border: 2px solid var(--input-border);
    border-radius: 4px;
    background: var(--input-bg);
    color: var(--dragon-red);
    font-family: inherit;
    font-size: inherit;
    font-weight: inherit;
    text-align: center;
    padding: 0;
}

.q-cell.input:focus {
    outline: none;
    border-color: var(--dragon-orange);
    box-shadow: 0 0 0 2px rgba(234, 88, 12, 0.3);
}

/* Dividend row with top border (the division line) */
.dividend-row {
    display: flex;
    border-top: 3px solid var(--division-line);
    padding-top: 2px;
}

.d-cell {
    width: var(--cell-size);
    height: var(--cell-size);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Working area */
.working-area {
    display: flex;
    flex-direction: column;
    margin-top: 4px;
}

.work-row {
    display: flex;
    min-height: var(--cell-size);
}

.w-cell {
    width: var(--cell-size);
    height: var(--cell-size);
    display: flex;
    align-items: center;
    justify-content: center;
}

.w-cell.empty { color: transparent; }

.w-cell.brought {
    color: var(--dragon-orange);
    font-weight: 700;
}

.w-cell.input {
    width: var(--cell-size);
    height: var(--cell-size);
    border: 2px solid var(--input-border);
    border-radius: 4px;
    background: var(--input-bg);
    color: var(--division-text);
    font-family: inherit;
    font-size: inherit;
    font-weight: inherit;
    text-align: center;
    padding: 0;
}

.w-cell.input:focus {
    outline: none;
    border-color: var(--dragon-orange);
    box-shadow: 0 0 0 2px rgba(234, 88, 12, 0.3);
}

.w-cell.input.error {
    border-color: var(--error);
    background: #FEE2E2;
    animation: shake 0.3s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-3px); }
    75% { transform: translateX(3px); }
}

/* Subtraction line */
.sub-line {
    height: 2px;
    background: var(--division-line);
    margin: 2px 0;
    margin-left: calc(var(--start, 0) * var(--cell-size));
    width: calc(var(--span, 2) * var(--cell-size));
}

/* Bring down equals row */
.equals-row {
    margin-top: 4px;
}

.equals {
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--cell-size);
    color: var(--division-text);
}

/* Final answer row */
.final-row {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 2px dashed var(--division-line);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    font-size: 1.1rem;
}

.final-input {
    width: 5rem;
    height: 2.5rem;
    font-size: 1.1rem;
    text-align: center;
    font-family: 'Courier New', monospace;
    font-weight: 700;
    border: 2px solid var(--input-border);
    border-radius: 6px;
    background: var(--input-bg);
    color: var(--division-text);
}

.final-input:focus {
    outline: none;
    border-color: var(--dragon-orange);
    box-shadow: 0 0 0 2px rgba(234, 88, 12, 0.3);
}

/* Game Actions */
.game-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
}

.game-actions .btn { flex: 1; max-width: 140px; }

/* Hint & Feedback */
.hint-area {
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    text-align: center;
}

.hint-area p { color: var(--dragon-gold); font-size: 0.9rem; }

.feedback-area { text-align: center; padding: var(--space-sm); }
.feedback-area p { font-size: 0.9rem; font-weight: 600; }
.feedback-area.success p { color: var(--success); }
.feedback-area.error p { color: var(--error); }

.game-controls { display: flex; justify-content: center; margin-top: auto; }

/* Overlay */
.overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    z-index: 100;
}

.overlay-content {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    max-width: 320px;
    width: 100%;
}

.answer-summary {
    font-size: 1rem;
    color: var(--dragon-gold);
    font-weight: 600;
    margin: var(--space-md) 0;
    font-family: 'Courier New', monospace;
}

/* Stage/Session Complete */
.celebration { text-align: center; padding: var(--space-md) 0; }
.celebration h2 { color: var(--dragon-gold); font-size: 1.2rem; margin: var(--space-sm) 0; }

.stage-stats, .session-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
}

.stat-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
    text-align: center;
}

.stat-card .stat-number { display: block; font-size: 1.3rem; font-weight: 700; color: var(--dragon-gold); }
.stat-card .stat-label { font-size: 0.65rem; color: var(--text-secondary); text-transform: uppercase; }

.unlock-message {
    background: rgba(234, 88, 12, 0.2);
    border: 2px solid var(--dragon-orange);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    text-align: center;
}

#unlocked-stage-name { font-size: 1rem; color: var(--dragon-gold); }

.stage-complete-buttons, .session-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

/* Responsive */
@media (min-width: 400px) {
    :root { --cell-size: 2.25rem; }
    .division-display { font-size: 1.75rem; }
}

@media (min-width: 480px) {
    :root { --cell-size: 2.5rem; }
    .division-display { font-size: 2rem; }
}

@media (prefers-reduced-motion: reduce) {
    * { animation: none !important; transition: none !important; }
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}