:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-card: #16161f;
    --bg-input: #1e1e2a;
    
    --text-primary: #f0f0f5;
    --text-secondary: #a0a0b0;
    --text-muted: #606070;
    
    --accent-primary: #6366f1;
    --accent-secondary: #818cf8;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
    
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    --border: #2a2a35;
    --border-focus: #6366f1;
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', Consolas, monospace;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    font-size: 1.2rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: var(--accent-gradient);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.nav {
    display: flex;
    gap: 0.5rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    font-weight: 500;
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.nav-link-primary {
    background: var(--accent-primary);
    color: white;
}

.nav-link-primary:hover {
    background: var(--accent-secondary);
    color: white;
}

.main {
    flex: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    width: 100%;
}

.hero {
    text-align: center;
    padding: 4rem 0;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
}

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

.badge {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-xl);
    font-size: 0.875rem;
    font-weight: 500;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
}

.badge-python { border-color: #3776ab; color: #5a9fd4; }
.badge-pydantic { border-color: #e92063; color: #f06292; }
.badge-json { border-color: #f7df1e; color: #f7df1e; }

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.section-header p {
    color: var(--text-secondary);
}

.demo-section {
    padding: 4rem 0;
}

.demo-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

@media (max-width: 1024px) {
    .demo-grid {
        grid-template-columns: 1fr;
    }
}

.input-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

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

.input-group textarea {
    width: 100%;
    padding: 1rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    resize: vertical;
    transition: border-color 0.2s ease;
}

.input-group textarea:focus {
    outline: none;
    border-color: var(--border-focus);
}

.evaluate-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    background: var(--accent-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.evaluate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.3);
}

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

.btn-icon {
    font-size: 0.875rem;
}

.results-panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

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

.results-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.verdict-badge {
    padding: 0.375rem 1rem;
    border-radius: var(--radius-xl);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.verdict-pending {
    background: var(--bg-tertiary);
    color: var(--text-muted);
}

.verdict-pass {
    background: rgba(34, 197, 94, 0.2);
    color: var(--success);
}

.verdict-borderline {
    background: rgba(245, 158, 11, 0.2);
    color: var(--warning);
}

.verdict-fail {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
}

.overall-score-card {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.score-ring {
    width: 120px;
    height: 120px;
    margin: 0 auto 0.75rem;
    position: relative;
}

.score-ring svg {
    transform: rotate(-90deg);
}

.score-ring-bg {
    fill: none;
    stroke: var(--bg-primary);
    stroke-width: 8;
}

.score-ring-progress {
    fill: none;
    stroke: url(#scoreGradient);
    stroke-width: 8;
    stroke-linecap: round;
    transition: stroke-dasharray 0.6s ease;
}

.score-value {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2rem;
    font-weight: 700;
}

.score-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.criteria-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

@media (max-width: 600px) {
    .criteria-grid {
        grid-template-columns: 1fr;
    }
}

.criterion-card {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 1rem;
    transition: transform 0.2s ease;
}

.criterion-card:hover {
    transform: translateY(-2px);
}

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

.criterion-name {
    font-weight: 500;
    font-size: 0.875rem;
}

.criterion-score {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--accent-secondary);
}

.criterion-bar {
    height: 4px;
    background: var(--bg-primary);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.criterion-bar-fill {
    height: 100%;
    width: 0%;
    background: var(--accent-gradient);
    border-radius: 2px;
    transition: width 0.4s ease;
}

.criterion-justification {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.4;
}

.json-output {
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.json-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border);
    font-size: 0.875rem;
    font-weight: 500;
}

.copy-btn {
    padding: 0.25rem 0.75rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.copy-btn:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

#json-output {
    padding: 1rem;
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.5;
    overflow-x: auto;
    max-height: 300px;
    overflow-y: auto;
}

#json-output code {
    color: var(--text-secondary);
}

.rubric-section {
    padding: 4rem 0;
}

.rubric-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 3rem;
}

@media (max-width: 900px) {
    .rubric-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .rubric-grid {
        grid-template-columns: 1fr;
    }
}

.rubric-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    text-align: center;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.rubric-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-primary);
}

.rubric-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.rubric-card h4 {
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.rubric-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.scoring-guide {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
}

.scoring-guide h3 {
    text-align: center;
    margin-bottom: 1.5rem;
}

.score-legend {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.score-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.score-num {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-weight: 600;
    font-size: 0.875rem;
}

.score-5 { background: rgba(34, 197, 94, 0.2); color: var(--success); }
.score-4 { background: rgba(34, 197, 94, 0.15); color: #4ade80; }
.score-3 { background: rgba(245, 158, 11, 0.2); color: var(--warning); }
.score-2 { background: rgba(239, 68, 68, 0.15); color: #f87171; }
.score-1 { background: rgba(239, 68, 68, 0.2); color: var(--danger); }

.verdict-legend {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.verdict-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.about-section {
    padding: 4rem 0;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

@media (max-width: 768px) {
    .about-content {
        grid-template-columns: 1fr;
    }
}

.about-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
}

.about-card h4 {
    margin-bottom: 1rem;
    font-weight: 600;
}

.about-card ul {
    list-style: none;
}

.about-card li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.about-card li::before {
    content: ">";
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: 600;
}

.footer {
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.875rem;
}

.footer-note {
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .main {
        padding: 1rem;
    }
    
    .header-content {
        padding: 1rem;
    }
    
    .nav {
        display: none;
    }
}