/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #000000;
    --primary-hover: #333333;
    --secondary-color: #666666;
    --success-color: #000000;
    --error-color: #000000;
    --warning-color: #666666;
    
    --text-primary: #000000;
    --text-secondary: #666666;
    --text-muted: #999999;
    
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --bg-accent: #f5f5f5;
    
    --border-color: #e0e0e0;
    --border-light: #f0f0f0;
    
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: none;
    --shadow-xl: none;
    
    --radius-sm: 0;
    --radius-md: 0;
    --radius-lg: 0;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
    font-family: var(--font-family);
    color: var(--text-primary);
    background: var(--bg-primary);
    line-height: 1.6;
    font-size: 16px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 3rem;
}

/* Navigation */
.navbar {
    background: var(--bg-primary);
    border-bottom: none;
    position: relative;
    z-index: 100;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 5rem;
    padding: 0 3rem;
}

.nav-brand h2 {
    font-size: 1.8rem;
    font-weight: 400;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 3rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 400;
    font-size: 1rem;
    transition: color 0.2s ease;
    padding: 0;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 400;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.15s ease;
    gap: 0.5rem;
    background: transparent;
}

.btn-primary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--text-primary);
}

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

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

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Hero Section */
.hero {
    background: var(--bg-primary);
    padding: 8rem 0 10rem 0;
    text-align: center;
}

.hero-title {
    font-size: 4rem;
    font-weight: 400;
    margin-bottom: 3rem;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 4rem;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 400;
    line-height: 1.5;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Features Section */
.features {
    padding: 8rem 0 6rem 0;
    background: var(--bg-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4rem;
    max-width: 1000px;
    margin: 0 auto;
}

.feature-card {
    background: transparent;
    padding: 0;
    border-radius: var(--radius-lg);
    text-align: left;
    border: none;
    transition: none;
}

.feature-icon {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 2rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.95rem;
}

/* How It Works Section */
.how-it-works {
    padding: 6rem 0;
    background: var(--bg-primary);
}

.section-title {
    text-align: left;
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 3rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.steps {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 2rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.step {
    display: inline-block;
    background: var(--bg-secondary);
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all 0.15s ease;
}

.step:hover {
    background: var(--bg-accent);
    color: var(--text-primary);
}

.step-number {
    display: none;
}

.step-content h3 {
    display: none;
}

.step-content p {
    margin: 0;
    font-size: inherit;
    color: inherit;
}

/* Stats Section */
.stats {
    padding: 8rem 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    max-width: 1000px;
    margin: 0 auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 1.1rem;
    line-height: 1.6;
}

.stat-card {
    text-align: left;
    padding: 2rem;
    border-right: 1px solid var(--border-color);
}

.stat-card:last-child {
    border-right: none;
}

.stat-number {
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-family: inherit;
}

.stat-label {
    color: var(--text-secondary);
    font-weight: 400;
    font-size: 0.9rem;
    text-transform: none;
    font-family: var(--font-family);
}

/* Page Header */
.page-header {
    background: var(--bg-primary);
    padding: 6rem 0 4rem 0;
    text-align: center;
}

.page-header h1 {
    font-size: 3rem;
    font-weight: 400;
    margin-bottom: 2rem;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.page-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
    line-height: 1.5;
}

/* Leaderboard Filters */
.leaderboard-filters {
    padding: 2rem 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

.filter-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.filter-select {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
}

/* Leaderboard Table */
.leaderboard {
    padding: 3rem 0;
    background: var(--bg-primary);
}

.leaderboard-table {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: none;
    overflow: hidden;
    margin-bottom: 2rem;
}

.table-header {
    display: grid;
    grid-template-columns: 80px 1fr 100px 80px 80px 80px;
    gap: 1rem;
    padding: 1rem 0;
    background: var(--bg-primary);
    font-weight: 400;
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-transform: none;
    letter-spacing: 0;
    border-bottom: 1px solid var(--border-color);
}

.table-row {
    display: grid;
    grid-template-columns: 80px 1fr 100px 80px 80px 80px;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-light);
    align-items: center;
    transition: none;
}

.table-row:hover {
    background: var(--bg-primary);
}

.table-row.top-performer {
    background: var(--bg-primary);
    border-color: var(--border-color);
}

.rank-col {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.rank-number {
    font-weight: 600;
    color: var(--text-primary);
}

.rank-badge {
    font-size: 1.25rem;
}

.name-col {
    display: flex;
    flex-direction: column;
}

.algo-name {
    font-weight: 600;
    color: var(--text-primary);
}

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

.positive {
    color: var(--success-color);
    font-weight: 600;
}

.negative {
    color: var(--error-color);
    font-weight: 600;
}

.status {
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
}

.status.active {
    background: #dcfce7;
    color: #166534;
}

.status.paused {
    background: #fef3c7;
    color: #92400e;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 2rem;
}

.pagination-btn {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.pagination-btn:hover,
.pagination-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.pagination-dots {
    padding: 0.5rem;
    color: var(--text-muted);
}

/* Market Benchmarks */
.market-benchmark {
    padding: 3rem 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.market-benchmark h2 {
    text-align: left;
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 2rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.benchmark-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.benchmark-card {
    background: transparent;
    padding: 0;
    border-radius: var(--radius-lg);
    text-align: left;
    border: none;
}

.benchmark-card h3 {
    font-size: 1rem;
    font-weight: 400;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.benchmark-return {
    font-size: 1.2rem;
    font-weight: 400;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.benchmark-period {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Submission Form */
.submission-form {
    padding: 3rem 0;
    background: var(--bg-primary);
}

.form-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    max-width: 1200px;
    margin: 0 auto;
}

.algorithm-form {
    grid-column: 1 / -1;
}

.form-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.api-documentation {
    grid-column: 1 / -1;
    margin-top: 3rem;
    padding-top: 3rem;
    border-top: 1px solid var(--border-color);
}

.algorithm-form {
    background: var(--bg-primary);
    padding: 0;
    border-radius: var(--radius-lg);
    border: none;
}

.form-section {
    margin-bottom: 3rem;
}

.form-section h2 {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 2rem;
    color: var(--text-primary);
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group small {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* File Upload */
.file-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--bg-primary);
}

.file-upload-area:hover {
    border-color: var(--primary-color);
    background: var(--bg-accent);
}

.file-upload-area.dragover {
    border-color: var(--primary-color);
    background: var(--bg-accent);
}

.file-upload-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.file-upload-link {
    color: var(--primary-color);
    cursor: pointer;
}

.file-info {
    margin-top: 0.5rem;
    padding: 0.5rem;
    background: var(--bg-accent);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Checkbox */
.checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    line-height: 1.5;
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    margin: 0;
}

.checkmark {
    width: 1rem;
    height: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    flex-shrink: 0;
    margin-top: 0.125rem;
}

.checkbox-label input:checked + .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-label input:checked + .checkmark::after {
    content: '✓';
    color: white;
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
}

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

.link:hover {
    text-decoration: underline;
}

/* Form Actions */
.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

/* API Documentation */
.api-documentation {
    background: var(--bg-primary);
    padding: 0;
    border-radius: var(--radius-lg);
    border: none;
    height: fit-content;
}

.api-documentation h2 {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 2rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.api-section {
    margin-bottom: 2rem;
}

.api-section h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.code-example {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow-x: auto;
}

.code-example pre {
    margin: 0;
    padding: 1rem;
}

.code-example code {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--text-primary);
}

.api-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.api-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-secondary);
}

.api-list li:last-child {
    border-bottom: none;
}

.api-list code {
    background: var(--bg-accent);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    color: var(--primary-color);
}

/* Footer */
.footer {
    background: var(--bg-primary);
    padding: 4rem 0 3rem 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 400;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .nav-container {
        padding: 0 1.5rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .nav-menu {
        gap: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .steps {
        justify-content: flex-start;
    }
    
    .form-container {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .form-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .table-header,
    .table-row {
        grid-template-columns: 60px 1fr 80px 60px 60px 60px;
        font-size: 0.8rem;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .stats-grid,
    .benchmark-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }
}