/* ============================================
   CSS VARIABLES - Theme System
   ============================================ */
:root {
    /* Light Theme Colors */
    --bg-primary: #f5f5f5;
    --bg-secondary: #ffffff;
    --bg-accent: #f0f0f0;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-muted: #999999;
    --border-color: #e0e0e0;
    --shadow: rgba(0, 0, 0, 0.1);

    /* Functional Colors */
    --color-correct: #22c55e;
    --color-incorrect: #ef4444;
    --color-current: #3b82f6;
    --color-primary: #6366f1;
    --color-primary-hover: #4f46e5;

    /* Spacing & Layout */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}
/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-accent: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --border-color: #334155;
    --shadow: rgba(0, 0, 0, 0.3);
}
/* ============================================
   RESET & BASE STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}


/* ============================================
   CONTAINER & LAYOUT
   ============================================ */
main {
    width: 100%;
}

.container {
    width: 100%;
    max-width: 1200px;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* ============================================
   HEADER
   ============================================ */

.title {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ============================================
   STATS PANEL
   ============================================ */
.stats-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px var(--shadow);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
}

/* ============================================
   TIMER SETTINGS
   ============================================ */
.timer-settings {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px var(--shadow);
}

.timer-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.timer-options {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.timer-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: calc(var(--border-radius) / 2);
    background-color: var(--bg-accent);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    flex: 1;
    min-width: 60px;
}

.timer-btn:hover {
    background-color: var(--border-color);
    transform: translateY(-2px);
}

.timer-btn.active {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.timer-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.timer-btn:disabled:hover {
    transform: none;
}

/* ============================================
   TEXT DISPLAY
   ============================================ */
.text-display {
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px var(--shadow);
    font-size: 1.5rem;
    line-height: 2;
    letter-spacing: 0.02em;
    font-family: 'Courier New', monospace;
    min-height: 200px;
    display: block;
    align-items: center;
    user-select: none;
    overflow-wrap: break-word;
}

.text-display span {
    transition: color 0.1s ease;
}

.text-display .correct {
    color: var(--color-correct);
}

.text-display .incorrect {
    color: var(--color-incorrect);
    background-color: rgba(239, 68, 68, 0.1);
}

.text-display .current {
    background-color: var(--color-current);
    color: white;
    animation: pulse 1s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.6;
    }
}

/* ============================================
   INPUT AREA
   ============================================ */
.input-area {
    width: 100%;
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: 'Courier New', monospace;
    resize: none;
    min-height: 100px;
    transition: var(--transition);
    box-shadow: 0 2px 8px var(--shadow);
}

.input-area:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.input-area::placeholder {
    color: var(--text-muted);
}

/* ============================================
   CONTROLS
   ============================================ */
.controls {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    flex: 1;
    min-width: 150px;
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

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

.btn-secondary:hover {
    background-color: var(--border-color);
    transform: translateY(-2px);
}

/* ============================================
   MODAL (Results Screen)
   ============================================ */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: 0 20px 60px var(--shadow);
    max-width: 600px;
    width: 90%;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-title {
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
    text-align: center;
    color: var(--text-primary);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.result-item {
    text-align: center;
    padding: var(--spacing-md);
    background-color: var(--bg-accent);
    border-radius: var(--border-radius);
}

.result-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.result-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.modal-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
    .title {
        font-size: 1.5rem;
    }

    .text-display {
        font-size: 1.25rem;
        padding: var(--spacing-md);
        min-height: 150px;
    }

    .stat-value {
        font-size: 1.5rem;
    }

    .modal-content {
        padding: var(--spacing-lg);
    }

    .result-value {
        font-size: 2rem;
    }

    .controls {
        flex-direction: column;
    }

    .btn {
        min-width: 100%;
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 1.25rem;
    }

    .text-display {
        font-size: 1rem;
        line-height: 1.8;
    }

    .stats-panel {
        grid-template-columns: 1fr;
    }
}