:root {
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-secondary: #8b5cf6;
    --color-accent: #06b6d4;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-bg: #0f172a;
    --color-bg-light: #1e293b;
    --color-bg-lighter: #334155;
    --color-text: #f1f5f9;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #94a3b8;
    --color-border: #334155;
    --header-bg: rgba(15, 23, 42, 0.8);
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.5);
}

html[data-theme="light"] {
    --color-bg: #f8fafc;
    --color-bg-light: #ffffff;
    --color-bg-lighter: #e2e8f0;
    --color-text: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #64748b;
    --color-border: #cbd5e1;
    --header-bg: rgba(248, 250, 252, 0.8);
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.15);
}

html[data-theme="dark"] {
    --color-bg: #0f172a;
    --color-bg-light: #1e293b;
    --color-bg-lighter: #334155;
    --color-text: #f1f5f9;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #94a3b8;
    --color-border: #334155;
    --header-bg: rgba(15, 23, 42, 0.8);
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.5);
}

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

button, input, select, textarea {
    color: inherit;
    font-family: inherit;
}


body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}

.background-pattern {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    background:
        radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(6, 182, 212, 0.05) 0%, transparent 50%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header */
.header {
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(10px);
    background: var(--header-bg);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
}

.logo-text {
    color: var(--color-text);
    text-decoration: none;
}

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

.logo-icon {
    width: 2rem;
    height: 2rem;
    color: var(--color-primary);
}

.nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.nav a:hover {
    color: var(--color-primary);
}

/* Hero Section */
.hero {
    padding: 2rem 0 1.5rem;
    text-align: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto 1.25rem;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.feature {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.1rem;
    background: var(--color-bg-light);
    border-radius: 9999px;
    border: 1px solid var(--color-border);
    font-weight: 500;
    font-size: 0.9rem;
}

.feature-icon {
    width: 1.25rem;
    height: 1.25rem;
    flex-shrink: 0;
    color: var(--color-primary);
}

/* Assessments Section */
.assessments {
    padding: 1.5rem 0 3rem;
}

.assessments-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 0.5rem;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text);
    margin: 0;
}

.stats-line {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
}

/* Domain Groups */
.domain-group {
    margin-bottom: 2rem;
}

.domain-group:last-child {
    margin-bottom: 0;
}

.domain-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding: 0.6rem 0 0.6rem 0.75rem;
    border-left: 3px solid var(--color-primary);
}

.domain-icon {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.domain-icon svg {
    width: 20px;
    height: 20px;
}

.domain-info {
    flex: 1;
    min-width: 0;
}

.domain-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.1rem;
}

.domain-description {
    color: var(--color-text-secondary);
    font-size: 0.825rem;
    line-height: 1.4;
}

.domain-count {
    flex-shrink: 0;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    background: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: 0.375rem;
    padding: 0.2rem 0.5rem;
}

/* Model Grid */
.model-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

/* Model Cards */
.model-card {
    background: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: 1rem;
    padding: 1.25rem;
    transition: all 0.2s;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
}

.model-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.model-card.coming-soon {
    opacity: 0.5;
    cursor: default;
}

.model-card.coming-soon:hover {
    border-color: var(--color-border);
    transform: none;
    box-shadow: none;
}

.model-card-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
    gap: 0.5rem;
}

.model-card-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.3;
}

.model-card-badge {
    padding: 0.15rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.65rem;
    font-weight: 600;
    white-space: nowrap;
    flex-shrink: 0;
    border: 1px solid;
}

.model-card-badge.live {
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.model-card-badge.coming {
    background: rgba(148, 163, 184, 0.15);
    color: var(--color-text-muted);
    border-color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.model-card-description {
    font-size: 0.825rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
    margin-bottom: 0.75rem;
    flex-grow: 1;
}

.model-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 0.75rem;
    border-top: 1px solid var(--color-border);
}

.model-card-meta {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.model-card-action {
    font-size: 0.825rem;
    font-weight: 600;
    color: var(--color-primary);
    transition: gap 0.2s;
}

/* Search */
.search-wrap {
    position: relative;
    min-width: 200px;
    max-width: 300px;
}

.search-icon {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    width: 1rem;
    height: 1rem;
    color: var(--color-text-muted);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 0.5rem 0.75rem 0.5rem 2.25rem;
    background: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    color: var(--color-text);
    font-size: 0.85rem;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

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

.search-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.search-clear {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--color-text-muted);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.25rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-clear:hover {
    color: var(--color-text);
}

.no-results {
    text-align: center;
    color: var(--color-text-muted);
    padding: 3rem 1rem;
    font-size: 1rem;
}

/* About Section */
.about {
    padding: 4rem 0;
    background: var(--color-bg-light);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.about-content > p {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    text-align: left;
}

.about-item h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-primary);
}

.about-item p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

/* Footer */
.footer {
    padding: 2rem 0;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    padding: 0.4rem;
    cursor: pointer;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s, border-color 0.2s;
    width: 2.25rem;
    height: 2.25rem;
}

.theme-toggle:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.theme-toggle svg {
    width: 1.25rem;
    height: 1.25rem;
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 50%;
    background: var(--color-primary);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s, transform 0.2s;
    z-index: 50;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-2px);
    background: var(--color-primary-dark);
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        padding: 0.75rem 0;
    }

    .header .container {
        flex-wrap: wrap;
        justify-content: center;
    }

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

    .nav {
        width: 100%;
        justify-content: center;
        gap: 1.25rem;
        padding-top: 0.25rem;
    }

    .theme-toggle {
        position: absolute;
        top: 0.75rem;
        right: 2rem;
    }

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

    .hero-subtitle {
        font-size: 1rem;
    }

    .assessments-header {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }

    .search-wrap {
        max-width: 100%;
    }

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

    .hero-features {
        gap: 0.75rem;
    }

    .feature {
        font-size: 0.875rem;
    }

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

    .section-title {
        font-size: 1.75rem;
    }

    .domain-header {
        flex-wrap: wrap;
    }
}