/* Keyboard Test - TechTools Dark Theme */

:root {
    /* Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a2e;
    --bg-card-hover: #232338;
    --bg-input: #0d0d14;

    /* Key Colors */
    --key-bg: #1e1e2e;
    --key-bg-hover: #2a2a3e;
    --key-bg-pressed: #3b82f6;
    --key-bg-tested: rgba(16, 185, 129, 0.15);
    --key-border: #3a3a4e;
    --key-border-tested: #10b981;

    /* Accent Colors */
    --accent-primary: #6366f1;
    --accent-secondary: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.3);

    /* Semantic Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;

    /* Text Colors */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-key: #cbd5e1;

    /* Borders */
    --border-color: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(255, 255, 255, 0.2);

    /* Sizing */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --key-size: 48px;
    --key-gap: 4px;

    /* Transitions */
    --transition-fast: 100ms ease;
    --transition-normal: 250ms ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* App Container */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 30px;
}

.back-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color var(--transition-fast);
}

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

.title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
}

.title-icon {
    width: 32px;
    height: 32px;
    color: var(--accent-primary);
}

.header-spacer {
    width: 100px;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Instructions */
.instructions {
    text-align: center;
    color: var(--text-secondary);
    font-size: 16px;
}

/* Stats Bar */
.stats-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    padding: 16px 24px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-label {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-reset {
    background: var(--bg-input);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

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

.btn-small {
    padding: 6px 12px;
    font-size: 12px;
    background: var(--bg-input);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

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

/* Keyboard Container */
.keyboard-container {
    display: flex;
    justify-content: center;
    overflow-x: auto;
    padding: 20px 0;
}

.keyboard {
    display: flex;
    flex-direction: column;
    gap: var(--key-gap);
    padding: 20px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.keyboard-row {
    display: flex;
    gap: var(--key-gap);
}

/* Keys */
.key {
    width: var(--key-size);
    height: var(--key-size);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--key-bg);
    border: 2px solid var(--key-border);
    border-radius: 6px;
    color: var(--text-key);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    user-select: none;
}

.key:hover {
    background: var(--key-bg-hover);
}

.key.pressed {
    background: var(--key-bg-pressed);
    border-color: var(--key-bg-pressed);
    color: white;
    transform: scale(0.95);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.5);
}

.key.tested {
    background: var(--key-bg-tested);
    border-color: var(--key-border-tested);
}

.key.tested.pressed {
    background: var(--key-bg-pressed);
    border-color: var(--key-bg-pressed);
}

.key span {
    line-height: 1;
}

.key .key-shift {
    font-size: 10px;
    color: var(--text-muted);
    margin-top: 2px;
}

.key.pressed .key-shift {
    color: rgba(255, 255, 255, 0.7);
}

.arrow-key {
    font-size: 14px;
}

/* Key Indicator (for Caps Lock, etc.) */
.key-indicator {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-muted);
}

.key-indicator.active {
    background: var(--success);
    box-shadow: 0 0 8px var(--success);
}

/* Key Sizes */
.key-fn {
    height: 36px;
    font-size: 10px;
}

.key-wide-1-25 {
    width: calc(var(--key-size) * 1.25 + var(--key-gap) * 0.25);
}

.key-wide-1-5 {
    width: calc(var(--key-size) * 1.5 + var(--key-gap) * 0.5);
}

.key-wide-1-75 {
    width: calc(var(--key-size) * 1.75 + var(--key-gap) * 0.75);
}

.key-wide-2 {
    width: calc(var(--key-size) * 2 + var(--key-gap));
}

.key-wide-2-25 {
    width: calc(var(--key-size) * 2.25 + var(--key-gap) * 1.25);
}

.key-wide-2-75 {
    width: calc(var(--key-size) * 2.75 + var(--key-gap) * 1.75);
}

.key-space {
    width: calc(var(--key-size) * 6.25 + var(--key-gap) * 5.25);
}

/* Spacers */
.key-spacer {
    width: var(--key-size);
}

.key-spacer-half {
    width: calc(var(--key-size) / 2);
}

/* Main keyboard layout with numpad */
.keyboard-main {
    display: flex;
    gap: calc(var(--key-size) / 2);
    margin-top: 10px;
}

.keyboard-left {
    display: flex;
    flex-direction: column;
    gap: var(--key-gap);
}

/* Numpad - CSS Grid for proper row spanning */
.numpad {
    display: grid;
    grid-template-columns: repeat(4, var(--key-size));
    grid-template-rows: repeat(5, var(--key-size));
    gap: var(--key-gap);
}

.key-numpad-tall {
    grid-row: span 2;
}

.key-numpad-wide {
    grid-column: span 2;
}

/* History Section */
.history-section {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 20px;
    border: 1px solid var(--border-color);
}

.history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.history-header h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.history-header h3 svg {
    width: 20px;
    height: 20px;
    color: var(--accent-primary);
}

.history-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    max-height: 100px;
    overflow-y: auto;
}

.history-placeholder {
    color: var(--text-muted);
    font-size: 14px;
}

.history-key {
    display: inline-flex;
    align-items: center;
    padding: 6px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 13px;
    font-family: 'Courier New', monospace;
    color: var(--text-primary);
}

.history-key.recent {
    background: rgba(99, 102, 241, 0.2);
    border-color: var(--accent-primary);
}

/* Test Section */
.test-section {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    border: 1px solid var(--border-color);
}

.test-section h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.test-section h3 svg {
    width: 20px;
    height: 20px;
    color: var(--accent-primary);
}

.test-description {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
}

.rollover-display {
    display: flex;
    gap: 24px;
    align-items: center;
}

.rollover-count {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 30px;
    background: var(--bg-input);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.rollover-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--accent-primary);
    font-family: 'Courier New', monospace;
    line-height: 1;
}

.rollover-label {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 8px;
}

.rollover-keys {
    flex: 1;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 16px;
    background: var(--bg-input);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    min-height: 80px;
    align-content: flex-start;
}

.rollover-placeholder {
    color: var(--text-muted);
    font-size: 14px;
}

.rollover-key {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 14px;
    background: var(--key-bg-pressed);
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    color: white;
    animation: keyPulse 0.5s ease infinite alternate;
}

@keyframes keyPulse {
    from {
        box-shadow: 0 0 10px rgba(59, 130, 246, 0.5);
    }
    to {
        box-shadow: 0 0 20px rgba(59, 130, 246, 0.8);
    }
}

/* Info Panel */
.info-panel {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    border: 1px solid var(--border-color);
}

.info-panel h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.info-panel h3 svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    color: var(--accent-primary);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.info-label {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-value {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
}

/* Tips Banner */
.tips-banner {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px 20px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
}

.tips-banner svg {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    color: var(--accent-primary);
    margin-top: 2px;
}

.tips-banner strong {
    color: var(--accent-primary);
}

/* SEO Content Section */
.seo-content {
    background: var(--bg-secondary);
    padding: 60px 0;
    margin-top: 60px;
}

.seo-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

.seo-content h2 {
    font-size: 28px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.seo-content > p {
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-size: 16px;
    line-height: 1.7;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.feature-card {
    background: var(--bg-card);
    padding: 24px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.feature-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
}

/* FAQ Section */
.faq-section {
    margin-bottom: 48px;
}

.faq-section h2 {
    margin-bottom: 24px;
}

.faq-item {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    margin-bottom: 12px;
    overflow: hidden;
}

.faq-item summary {
    padding: 18px 24px;
    cursor: pointer;
    font-weight: 500;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: 20px;
    color: var(--accent-primary);
    transition: transform var(--transition-fast);
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item p {
    padding: 0 24px 18px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Use Cases */
.use-cases {
    background: var(--bg-card);
    padding: 24px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.use-cases h3 {
    margin-bottom: 16px;
    color: var(--text-primary);
}

.use-cases ul {
    list-style: none;
}

.use-cases li {
    padding: 8px 0;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.use-cases li:last-child {
    border-bottom: none;
}

.use-cases li strong {
    color: var(--text-primary);
}

/* Footer */
.footer {
    text-align: center;
    padding: 30px 0;
    color: var(--text-muted);
    font-size: 14px;
    border-top: 1px solid var(--border-color);
    margin-top: 40px;
}

/* Responsive */
@media (max-width: 1200px) {
    :root {
        --key-size: 42px;
    }
}

@media (max-width: 1000px) {
    :root {
        --key-size: 36px;
    }

    .key {
        font-size: 10px;
    }

    .key .key-shift {
        font-size: 8px;
    }

    .key-fn {
        height: 30px;
        font-size: 9px;
    }
}

@media (max-width: 768px) {
    .header {
        flex-wrap: wrap;
        gap: 12px;
    }

    .title {
        order: -1;
        width: 100%;
        justify-content: center;
        font-size: 20px;
    }

    .back-link {
        font-size: 13px;
    }

    .header-spacer {
        display: none;
    }

    .stats-bar {
        gap: 16px;
    }

    .stat-item {
        min-width: 80px;
    }

    :root {
        --key-size: 32px;
    }

    .keyboard {
        padding: 12px;
    }

    .keyboard-main {
        flex-direction: column;
        align-items: center;
    }

    .numpad {
        margin-top: 8px;
    }

    .rollover-display {
        flex-direction: column;
    }

    .rollover-count {
        width: 100%;
    }

    .rollover-keys {
        width: 100%;
    }

    .info-grid {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    :root {
        --key-size: 28px;
        --key-gap: 2px;
    }

    .key {
        font-size: 8px;
        border-radius: 4px;
    }

    .key .key-shift {
        display: none;
    }

    .key-fn {
        height: 24px;
        font-size: 7px;
    }

    .arrow-key {
        font-size: 10px;
    }
}

@media (max-width: 480px) {
    .app-container {
        padding: 0 12px;
    }

    .keyboard {
        padding: 8px;
    }

    :root {
        --key-size: 24px;
    }
}