/* ===== CSS Variables ===== */
:root {
    /* Colors */
    --color-primary: #2b87d1;
    --color-primary-dark: #1e6bb3;
    --color-primary-light: #5ba3de;

    --color-waiting: #ce4949;
    --color-waiting-dark: #b33a3a;
    --color-ready: #4bce4b;
    --color-ready-dark: #3ab33a;
    --color-result: #2b87d1;
    --color-too-soon: #f59e0b;
    --color-too-soon-dark: #d97706;

    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;

    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
    --color-border: #e2e8f0;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

main {
    flex: 1;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

img,
svg {
    display: block;
    max-width: 100%;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===== Header ===== */
.header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text);
    transition: opacity var(--transition-fast);
}

.logo:hover {
    opacity: 0.8;
}

.logo-icon {
    width: 28px;
    height: 28px;
    color: var(--color-primary);
}

.logo-text {
    color: var(--color-text);
}

.logo-dot {
    color: var(--color-primary);
}

/* ===== Test Container ===== */
.test-container {
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color var(--transition-normal);
    user-select: none;
    position: relative;
    overflow: hidden;
}

.test-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0;
    transition: opacity var(--transition-normal);
    pointer-events: none;
}

.test-content {
    text-align: center;
    padding: var(--spacing-2xl);
    position: relative;
    z-index: 1;
}

.test-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-lg);
    animation: float 3s ease-in-out infinite;
}

.test-icon svg {
    width: 100%;
    height: 100%;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.test-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.test-description {
    font-size: 1.125rem;
    line-height: 1.7;
    max-width: 500px;
    margin: 0 auto;
}

.result-display {
    display: none;
    align-items: baseline;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.result-value {
    font-size: 5rem;
    font-weight: 800;
    line-height: 1;
}

.result-unit {
    font-size: 2rem;
    font-weight: 600;
    opacity: 0.8;
}

.try-again-btn {
    display: none;
    margin-top: var(--spacing-xl);
    padding: var(--spacing-md) var(--spacing-xl);
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-full);
    color: inherit;
    font-size: 1rem;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.try-again-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

/* State: Idle */
.state-idle {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #ffffff;
}

.state-idle .test-icon {
    color: #ffffff;
}

/* State: Waiting (Red) */
.state-waiting {
    background: linear-gradient(135deg, var(--color-waiting) 0%, var(--color-waiting-dark) 100%);
    color: #ffffff;
}

.state-waiting .test-icon {
    animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
        opacity: 1;
    }

    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

/* State: Ready (Green) */
.state-ready {
    background: linear-gradient(135deg, var(--color-ready) 0%, var(--color-ready-dark) 100%);
    color: #ffffff;
}

.state-ready .test-icon {
    animation: none;
}

/* State: Result */
.state-result {
    background: linear-gradient(135deg, var(--color-result) 0%, var(--color-primary-dark) 100%);
    color: #ffffff;
}

.state-result .test-icon {
    display: none;
}

.state-result .test-description {
    display: none;
}

.state-result .result-display {
    display: flex;
}

.state-result .try-again-btn {
    display: inline-block;
}

/* State: Too Soon */
.state-too-soon {
    background: linear-gradient(135deg, var(--color-too-soon) 0%, var(--color-too-soon-dark) 100%);
    color: #ffffff;
}

.state-too-soon .test-icon svg path {
    d: path("M12 8v4m0 4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z");
}

/* ===== Statistics Section ===== */
.stats-section {
    padding: var(--spacing-3xl) 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

/* ===== Cards ===== */
.card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
    transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.card-icon {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
}

/* ===== Stats Card ===== */
.stats-numbers {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

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

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
}

.stat-item.best .stat-value {
    color: var(--color-success);
}

.stat-item.worst .stat-value {
    color: var(--color-danger);
}

.chart-container {
    height: 150px;
    margin-bottom: var(--spacing-xl);
    position: relative;
}

#stats-chart {
    width: 100%;
    height: 100%;
}

.reset-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-md);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.reset-btn:hover {
    background: var(--color-danger);
    border-color: var(--color-danger);
    color: #ffffff;
}

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

/* ===== About Card ===== */
.about-content p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.about-content strong {
    color: var(--color-text);
}

.tip-box {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: linear-gradient(135deg, rgba(43, 135, 209, 0.1) 0%, rgba(43, 135, 209, 0.05) 100%);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-primary);
    margin-top: var(--spacing-lg);
}

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

.tip-box span {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ===== Recent Card ===== */
.recent-card {
    width: 100%;
}

.recent-results {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.empty-results {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    width: 100%;
    text-align: center;
    color: var(--color-text-muted);
}

.empty-results svg {
    width: 48px;
    height: 48px;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
    animation: spin 4s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.result-tag {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
    border: 1px solid var(--color-border);
    animation: fadeIn 0.3s ease;
}

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

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

.result-tag.fast {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.15) 0%, rgba(16, 185, 129, 0.05) 100%);
    border-color: var(--color-success);
    color: var(--color-success);
}

.result-tag.average {
    background: linear-gradient(135deg, rgba(43, 135, 209, 0.15) 0%, rgba(43, 135, 209, 0.05) 100%);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.result-tag.slow {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.15) 0%, rgba(245, 158, 11, 0.05) 100%);
    border-color: var(--color-warning);
    color: var(--color-warning);
}

.result-tag-number {
    font-weight: 700;
}

/* ===== Footer ===== */
.footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.footer p {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* ===== Responsive Design ===== */
@media (max-width: 992px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .test-container {
        min-height: 350px;
    }

    .test-title {
        font-size: 2rem;
    }

    .test-description {
        font-size: 1rem;
    }

    .result-value {
        font-size: 4rem;
    }

    .result-unit {
        font-size: 1.5rem;
    }

    .test-content {
        padding: var(--spacing-xl);
    }

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

@media (max-width: 480px) {
    .test-container {
        min-height: 300px;
    }

    .test-title {
        font-size: 1.5rem;
    }

    .result-value {
        font-size: 3rem;
    }

    .result-unit {
        font-size: 1.25rem;
    }

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

    .stats-numbers {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-sm);
    }

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

/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles */
button:focus-visible,
a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ===== Read More Button ===== */
.read-more-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-full);
    color: var(--color-primary);
    font-size: 0.875rem;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.read-more-btn:hover {
    background: var(--color-primary);
    color: #ffffff;
}

.read-more-btn svg {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-fast);
}

.read-more-btn:hover svg {
    transform: translateX(4px);
}

/* ===== Article Modal ===== */
.article-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.article-modal.active {
    opacity: 1;
    visibility: visible;
}

.article-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.article-modal-container {
    position: relative;
    width: 90%;
    max-width: 800px;
    max-height: 85vh;
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    transform: translateY(20px) scale(0.95);
    transition: transform var(--transition-normal);
}

.article-modal.active .article-modal-container {
    transform: translateY(0) scale(1);
}

.article-modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    z-index: 10;
    transition: all var(--transition-fast);
}

.article-modal-close:hover {
    background: var(--color-danger);
    border-color: var(--color-danger);
    color: #ffffff;
}

.article-modal-close svg {
    width: 20px;
    height: 20px;
}

.article-content {
    padding: var(--spacing-2xl);
    padding-right: var(--spacing-xl);
    max-height: 85vh;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) transparent;
}

.article-content::-webkit-scrollbar {
    width: 8px;
}

.article-content::-webkit-scrollbar-track {
    background: transparent;
}

.article-content::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-full);
}

.article-content::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

.article-content h2 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-text);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-primary);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.article-content h3 {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--color-text);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.article-content h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.article-content p {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.article-content strong {
    color: var(--color-text);
    font-weight: 600;
}

.article-content ul,
.article-content ol {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-xl);
}

.article-content li {
    margin-bottom: var(--spacing-sm);
}

.article-content li strong {
    color: var(--color-primary);
}

/* Body scroll lock when modal is open */
body.modal-open {
    overflow: hidden;
}

/* ===== Article Modal Responsive ===== */
@media (max-width: 768px) {
    .article-modal-container {
        width: 95%;
        max-height: 90vh;
    }

    .article-content {
        padding: var(--spacing-xl);
        padding-top: var(--spacing-3xl);
    }

    .article-content h2 {
        font-size: 1.5rem;
    }

    .article-content h3 {
        font-size: 1.25rem;
    }

    .article-content h4 {
        font-size: 1rem;
    }

    .article-modal-close {
        top: var(--spacing-sm);
        right: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .article-modal-container {
        width: 100%;
        height: 100%;
        max-height: 100%;
        border-radius: 0;
    }

    .article-content {
        max-height: 100vh;
        padding: var(--spacing-lg);
        padding-top: var(--spacing-3xl);
    }

    .article-content h2 {
        font-size: 1.375rem;
    }
}