/* ===== CSS VARIABLES & DESIGN SYSTEM ===== */
:root {
    /* Monochromatic Black & White Theme */
    --bg-primary: #000000;
    --bg-secondary: rgba(255, 255, 255, 0.05);
    --bg-tertiary: rgba(255, 255, 255, 0.08);
    --bg-card: rgba(255, 255, 255, 0.03);

    /* Accent Colors (Pure White/Grey) */
    --accent-primary: #ffffff;
    --accent-secondary: #cccccc;
    --accent-success: #ffffff;
    --accent-error: #ff4444;
    --accent-warning: #f59e0b;

    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.85);
    --text-muted: rgba(255, 255, 255, 0.45);
    --text-disabled: rgba(255, 255, 255, 0.25);

    /* Border & Shadow (Transparent & Sharp) */
    --border-color: rgba(255, 255, 255, 0.15);
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.8);
    --shadow-lg: 0 0 30px rgba(255, 255, 255, 0.05);
    --shadow-inset: inset 0 0 10px rgba(255, 255, 255, 0.05);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3.3rem;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    /* Transitions */
    --transition-fast: 0.1s ease;
    --transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s ease;
}

/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== WELCOME SCREEN ===== */
.welcome-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.8s ease, visibility 0.8s;
}

.welcome-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.welcome-content {
    text-align: center;
    animation: scaleUp 0.8s ease-out;
}

@keyframes scaleUp {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.welcome-logo {
    font-size: 5rem;
    margin-bottom: var(--spacing-md);
    animation: pulse 2s infinite;
}

.welcome-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    color: var(--accent-primary);
}

.welcome-subtitle {
    color: var(--text-muted);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
}

.welcome-loader {
    width: 200px;
    height: 4px;
    background: var(--bg-card);
    border-radius: 999px;
    margin: 0 auto;
    overflow: hidden;
}

.loader-bar {
    height: 100%;
    width: 0%;
    background: var(--accent-primary);
    box-shadow: 0 0 15px white;
    animation: load 2s ease-in-out forwards;
}

@keyframes load {
    from {
        width: 0%;
    }

    to {
        width: 100%;
    }
}

/* ===== NAVIGATION ===== */
.navbar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
}

.brand-icon {
    font-size: 2rem;
}

.brand-name {
    color: var(--text-primary);
}

.nav-stats {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.nav-stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav-stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-primary);
}

/* ===== MAIN CONTAINER ===== */
.main-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    display: flex;
    gap: var(--spacing-2xl);
    align-items: flex-start;
}

/* ===== SETTINGS PANEL ===== */
.settings-panel {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-lg);
    width: 280px;
    flex-shrink: 0;
    position: sticky;
    top: 100px;
}

.content-area {
    flex: 1;
    min-width: 0;
    /* Prevents flex items from overflowing */
}

.setting-group {
    min-width: 200px;
}

.setting-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.setting-options {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.setting-btn {
    min-width: 60px;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: var(--font-family);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

.setting-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.setting-btn.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: var(--bg-primary);
    box-shadow: 0 0 25px rgba(255, 255, 255, 0.4);
    font-weight: 700;
}

/* ===== STATS BAR ===== */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.stat-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-base);
    backdrop-filter: blur(10px);
}

.stat-item:hover {
    background: var(--bg-tertiary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md), var(--shadow-lg);
    border-color: rgba(255, 255, 255, 0.3);
}

.stat-icon {
    font-size: 2rem;
}

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===== PROGRESS BAR ===== */
.progress-container {
    height: 6px;
    background: var(--bg-card);
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: var(--spacing-xl);
}

.progress-bar {
    height: 100%;
    background: var(--accent-primary);
    width: 0%;
    transition: width 0.3s ease;
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.4);
}

/* ===== TYPING AREA ===== */
.typing-container {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    backdrop-filter: blur(15px);
    box-shadow: var(--shadow-inset);
}

.text-display {
    font-family: var(--font-mono);
    font-size: 1.125rem;
    line-height: 1.4;
    letter-spacing: 0.01em;
    margin-bottom: var(--spacing-xl);
    min-height: 150px;
    max-height: 500px;
    overflow-y: auto;
    user-select: none;
    color: var(--text-muted);
    padding-right: var(--spacing-md);
}

.text-display::-webkit-scrollbar {
    width: 8px;
}

.text-display::-webkit-scrollbar-track {
    background: var(--bg-card);
    border-radius: var(--radius-sm);
}

.text-display::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    border: 2px solid var(--bg-card);
}

.text-display::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}

.text-display span {
    transition: all var(--transition-fast);
    position: relative;
}

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

.text-display span.incorrect {
    color: var(--accent-error);
    background: rgba(239, 68, 68, 0.2);
    border-radius: 3px;
}

.text-display span.current {
    background: var(--accent-primary);
    color: var(--bg-primary);
    border-radius: 3px;
    animation: pulse 1s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.6;
    }
}

.typing-input {
    width: 100%;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 1rem;
    resize: none;
    height: 100px;
    transition: all var(--transition-base);
}

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

.typing-input::placeholder {
    color: var(--text-disabled);
}

/* ===== WPM CHART ===== */
.chart-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.chart-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

#wpm-chart {
    width: 100%;
    height: 200px;
}

/* ===== CONTROLS ===== */
.controls {
    display: flex;
    justify-content: flex-start;
    gap: var(--spacing-md);
}

.restart-btn {
    background: var(--accent-primary);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg) var(--spacing-2xl);
    color: var(--bg-primary);
    font-family: var(--font-family);
    font-size: 1.125rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.restart-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(255, 255, 255, 0.2);
    background: #f0f0f0;
}

.restart-btn:active {
    transform: translateY(0);
}

.btn-icon {
    font-size: 1.5rem;
}

.btn-hint {
    font-size: 0.75rem;
    opacity: 0.8;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
}

/* ===== MODAL ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.modal.hidden {
    display: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
}

.modal-content {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    max-width: 700px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: scaleIn 0.4s ease;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-close {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: var(--accent-error);
    color: white;
    transform: rotate(90deg);
}

.modal-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.results-summary {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.result-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-base);
}

.result-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.result-card.primary {
    grid-column: 1 / -1;
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-primary);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
}

.result-value {
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.result-card.primary .result-value {
    font-size: 4rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.results-details {
    display: grid;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.detail-section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.detail-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.detail-content {
    font-family: var(--font-mono);
    font-size: 1.125rem;
    color: var(--text-primary);
}

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

.action-btn {
    flex: 1;
    padding: var(--spacing-lg) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-lg);
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.action-btn.primary {
    background: var(--accent-primary);
    color: var(--bg-primary);
    font-weight: 700;
    box-shadow: var(--shadow-md);
}

.action-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.action-btn.secondary {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
}

.action-btn.secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .main-container {
        flex-direction: column;
    }

    .settings-panel {
        width: 100%;
        position: static;
        margin-bottom: var(--spacing-xl);
    }

    .stats-bar {
        grid-template-columns: repeat(2, 1fr);
    }

    .stat-item {
        padding: var(--spacing-md);
    }

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

    .stat-value {
        font-size: 1.25rem;
    }

    .text-display {
        font-size: 1.125rem;
        line-height: 2;
    }

    .results-summary {
        grid-template-columns: 1fr;
    }

    .result-card.primary {
        grid-column: 1;
    }

    .modal-actions {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .main-container {
        padding: var(--spacing-md);
    }

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

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

    .typing-input {
        height: 80px;
    }
}

/* ===== FOOTER ===== */
.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-2xl) 0;
    margin-top: var(--spacing-2xl);
    backdrop-filter: blur(10px);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: var(--spacing-xl);
}

.footer-info {
    flex: 1;
    min-width: 250px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-description {
    color: var(--text-muted);
    font-size: 0.875rem;
    line-height: 1.6;
    max-width: 300px;
}

.footer-links {
    display: flex;
    gap: var(--spacing-2xl);
}

.footer-link-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-link-title {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.footer-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--accent-primary);
}

.footer-bottom {
    max-width: 1200px;
    margin: var(--spacing-xl) auto 0;
    padding: var(--spacing-lg) var(--spacing-lg) 0;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-disabled);
    font-size: 0.75rem;
}

@media (max-width: 768px) {
    .footer-container {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
        width: 100%;
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
    }
}