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

:root {
    /* SuperGLUE-inspired Color Palette */
    --primary-blue: #2563eb;
    --primary-dark: #1e40af;
    --accent-blue: #3b82f6;
    --light-blue: #dbeafe;

    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;

    --bg-white: #ffffff;
    --bg-light: #f9fafb;
    --bg-gray: #f3f4f6;

    --border-light: #e5e7eb;
    --border-gray: #d1d5db;

    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* 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 -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* ===== Base Typography ===== */
body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}



h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

p {
    color: var(--text-secondary);
    line-height: 1.7;
}

a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

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

.section {
    padding: var(--spacing-3xl) 0;
}

.bg-light {
    background-color: var(--bg-light);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-header h2 {
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

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

.section-actions {
    margin-top: var(--spacing-md);
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* ===== Header ===== */
.header {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: 1000;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

.header-content {
    display: flex !important;
    justify-content: space-between !important;
    align-items: center !important;
    padding: 1rem 0;
    width: 100%;
    min-height: 60px;
}

.logo {
    font-size: 2.5rem !important;
    font-weight: 700;
    color: var(--primary-blue);
    margin: 0;
    flex-shrink: 0;
}

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

.nav {
    display: flex !important;
    gap: 0.3rem;
    align-items: center;
    flex-wrap: nowrap !important;
    margin-left: auto;
}

.nav-link {
    padding: 0.5rem 0.6rem;
    font-size: 0.75rem;
    white-space: nowrap;
}

.nav-link:hover,
.nav-link:focus {
    background: var(--bg-light);
    color: var(--primary-blue);
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

.nav-link.active {
    color: var(--primary-blue);
    font-weight: 600;
    background: var(--bg-light);
}

.nav-link-two-line {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1px;
    min-width: 70px; /* Consistent width */
}

.nav-link-two-line .line1 {
    font-weight: 600;
    font-size: 0.7rem;
}

.nav-link-two-line .line2 {
    font-size: 0.6rem;
    opacity: 0.8;
}

/* ===== Hero Section ===== */
.hero {
    padding: var(--spacing-3xl) 0 var(--spacing-3xl);
    text-align: center;
    background: linear-gradient(135deg, var(--bg-white) 0%, var(--bg-light) 100%);
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 4rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.025em;
}

.hero h2 {
    font-size: var(--font-size-2xl);
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-3xl);
    margin: var(--spacing-2xl) 0;
    padding: var(--spacing-xl) 0;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-2xl);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 500;
    border: 1px solid transparent;
    border-radius: 8px;
    text-decoration: none;
    cursor: pointer;
    -webkit-transition: all 0.2s ease;
    -moz-transition: all 0.2s ease;
    -o-transition: all 0.2s ease;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary-blue);
    color: white;
    border-color: var(--primary-blue);
}

.btn-primary:hover,
.btn-primary:focus {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: white;
    -webkit-transform: translateY(-1px);
    -ms-transform: translateY(-1px);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

.btn-secondary {
    background: var(--bg-white);
    color: var(--primary-blue);
    border-color: var(--border-gray);
}

.btn-secondary:hover,
.btn-secondary:focus {
    background: var(--light-blue);
    border-color: var(--primary-blue);
    color: var(--primary-dark);
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

.btn-outline {
    background: transparent;
    color: var(--primary-blue);
    border-color: var(--primary-blue);
}

.btn-outline:hover,
.btn-outline:focus {
    background: var(--primary-blue);
    color: white;
    outline: 2px solid var(--primary-dark);
    outline-offset: 2px;
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    -webkit-transform: none;
    -ms-transform: none;
    transform: none;
}

.btn:disabled:hover,
.btn:disabled:focus {
    outline: none;
    -webkit-transform: none;
    -ms-transform: none;
    transform: none;
}

/* ===== Overview Grid ===== */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.overview-card {
    background: var(--bg-white);
    padding: var(--spacing-xl);
    border-radius: 12px;
    border: 1px solid var(--border-light);
    text-align: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.overview-card:hover {
    -webkit-transform: translateY(-2px);
    -ms-transform: translateY(-2px);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}
.overview-card h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-xl);
}
.overview-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== Datasets Grid ===== */
.datasets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.dataset-card {
    background: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: 12px;
    padding: var(--spacing-xl);
    transition: all 0.2s ease;
    overflow: hidden;

    display: flex;
    flex-direction: column;
}
.dataset-card:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.dataset-card h3 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-xl);
    
    /* ✅ Allow wrapping for long names */
    word-wrap: break-word;
    word-break: break-word;
    overflow-wrap: break-word;

    /* ✅ Prevent overflow */
    white-space: normal;

    line-height: 1.3;
    max-width: 100%;
}


.dataset-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
    /* Ensure description text also wraps properly */
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.dataset-card h3.long-name {
    font-size: var(--font-size-lg);
    line-height: 1.2;
}

.dataset-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-xs) 0;
    border-top: 1px solid var(--border-light);
    padding-top: var(--spacing-md);
    gap: var(--spacing-sm);
}

.dataset-info span {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    background: var(--bg-gray);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 6px;
    flex: 1;
    min-width: 0;
    word-break: break-word;
}

.dataset-metrics {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}
.metric-tag {
    font-size: var(--font-size-xs);
    padding: 4px 8px;
    background: var(--light-blue);
    color: var(--primary-blue);
    border-radius: 4px;
    font-weight: 500;
}

.dataset-actions {
    margin-top: var(--spacing-md);
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;

    margin-top: auto;
}

/* ===== Leaderboard ===== */
.leaderboard-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: 12px;
}

.control-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.control-group label {
    font-weight: 500;
    color: var(--text-primary);
}

.control-select {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-gray);
    border-radius: 6px;
    background: var(--bg-white);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.leaderboard-container {
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    overflow: hidden;
    margin-top: 2rem;
}







.leaderboard-container > div {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}
.score-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-weight: 500;
    font-size: 0.85rem;
    min-width: 50px;
    text-align: center;
}
.score-excellent {
    background: #d4edda;
    color: #155724;
}

.score-good {
    background: #cce5ff;
    color: #004085;
}

.score-fair {
    background: #fff3cd;
    color: #856404;
}

.score-poor {
    background: #f8d7da;
    color: #721c24;
}

.rank-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    font-weight: 600;
    font-size: 0.9rem;
}

.rank-1 {
    background: linear-gradient(45deg, #ffd700, #ffed4e);
    color: #856404;
}

.rank-2 {
    background: linear-gradient(45deg, #c0c0c0, #e8e8e8);
    color: #495057;
}

.rank-3 {
    background: linear-gradient(45deg, #cd7f32, #d2b48c);
    color: #5d4e37;
}

.rank-other {
    background: var(--bg-light);
    color: var(--text-primary);
}


/* ===== Submit Section ===== */
.submit-container {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-3xl);
    max-width: 1400px;
    margin: 0 auto;
}

.submit-info {
    background: var(--bg-white);
    padding: var(--spacing-xl);
    border-radius: 12px;
    border: 1px solid var(--border-light);
    height: fit-content;
}

.submit-info h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.submit-info ul {
    list-style: none;
    margin-bottom: var(--spacing-xl);
}

.submit-info li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--spacing-lg);
}

.submit-info li:before {
    content: "•";
    color: var(--primary-blue);
    font-weight: bold;
    position: absolute;
    left: 0;
}

.api-format {
    margin-top: var(--spacing-xl);
}

.api-format h4 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    font-size: var(--font-size-lg);
}

.code-block {
    background: var(--bg-gray);
    border: 1px solid var(--border-gray);
    border-radius: 8px;
    padding: var(--spacing-md);
    overflow-x: auto;
}

.code-block pre {
    margin: 0;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    line-height: 1.5;
}

.submit-form-wrapper {
    background: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: 12px;
    overflow: hidden;
}

.submit-form {
    padding: var(--spacing-xl);
}

.form-section {
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--border-light);
}

.form-section:last-of-type {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.form-section h3 {
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    font-size: var(--font-size-xl);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--border-gray);
    border-radius: 8px;
    font-size: var(--font-size-base);
    background: var(--bg-white);
    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-blue);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-help {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

.form-actions {
    text-align: center;
    padding-top: var(--spacing-xl);
}

/* ===== Submit Result ===== */
.submit-result {
    margin: var(--spacing-xl);
    padding: var(--spacing-lg);
    border-radius: 8px;
    text-align: center;
}

.submit-result.success {
    background: #d1fae5;
    border: 1px solid #10b981;
    color: #065f46;
}

.submit-result.error {
    background: #fee2e2;
    border: 1px solid #ef4444;
    color: #991b1b;
}

.submit-result h3 {
    margin-bottom: var(--spacing-sm);
}

/* ===== Footer ===== */
.footer {
    background: var(--bg-gray);
    border-top: 1px solid var(--border-light);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    font-size: var(--font-size-lg);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: var(--spacing-xs);
}

.footer-section a {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.footer-section a:hover {
    color: var(--primary-blue);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-light);
}

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

/* ===== States & Utilities ===== */
.loading {
    text-align: center;
    padding: var(--spacing-3xl);
    color: var(--text-muted);
    font-style: italic;
}

.error {
    color: var(--error);
    text-align: center;
    padding: var(--spacing-lg);
}

.empty-state {
    text-align: center;
    padding: var(--spacing-3xl);
    color: var(--text-muted);
}

.text-center { text-align: center; }
.text-left   { text-align: left; }
.text-right  { text-align: right; }
.hidden { display: none !important; }


/* ===== Animations ===== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0);    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

/* ===== Print Styles ===== */
@media print {
    .header,
    .footer,
    .hero-actions,
    .submit-form {
        display: none;
    }

    .section {
        padding: var(--spacing-lg) 0;
    }

    .container {
        max-width: none;
        padding: 0;
    }
}

/* Download Section */
.download-section {
    background: linear-gradient(135deg, var(--light-blue) 0%, var(--bg-light) 100%);
    border: 2px dashed var(--primary-blue);
    border-radius: 12px;
    padding: var(--spacing-2xl);
    text-align: center;
    margin: var(--spacing-xl) 0;
    transition: all 0.3s ease;
}

.download-section:hover {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--accent-blue) 100%);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.download-section:hover .btn-primary {
    background: white;
    color: var(--primary-blue);
    border-color: white;
}

.download-icon {
    font-size: 3rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
    transition: color 0.3s ease;
}

.download-section:hover .download-icon {
    color: white;
}

.download-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-md) 0;
    border-top: 1px solid rgba(37, 99, 235, 0.2);
    border-bottom: 1px solid rgba(37, 99, 235, 0.2);
}

.download-stat {
    text-align: center;
}

.download-stat-number {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-blue);
    display: block;
}

.download-section:hover .download-stat-number {
    color: white;
}

.download-stat-label {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.download-section:hover .download-stat-label {
    color: rgba(255, 255, 255, 0.9);
}

/* File Upload Styles */
.upload-area {
    border: 2px dashed var(--border-gray);
    border-radius: 12px;
    padding: var(--spacing-2xl);
    text-align: center;
    background: var(--bg-light);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary-blue);
    background: var(--light-blue);
    transform: scale(1.02);
}

.upload-area.has-files {
    border-color: var(--success);
    background: #f0fdf4;
}

.upload-icon {
    font-size: 2.5rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
    transition: color 0.3s ease;
}

.upload-area:hover .upload-icon,
.upload-area.dragover .upload-icon {
    color: var(--primary-blue);
}

.upload-area.has-files .upload-icon {
    color: var(--success);
}

.upload-text {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.upload-subtext {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.file-input {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

/* File List */
.uploaded-files {
    margin-top: var(--spacing-lg);
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    margin-bottom: var(--spacing-sm);
    transition: all 0.2s ease;
}

.file-item:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-sm);
}

.file-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.file-icon {
    color: var(--success);
    font-size: var(--font-size-lg);
}

.file-name {
    font-weight: 500;
    color: var(--text-primary);
}

.file-size {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.file-remove {
    color: var(--error);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: 4px;
    transition: background-color 0.2s ease;
}

.file-remove:hover {
    background: var(--bg-light);
}

/* Progress Indicators */
.submission-progress {
    background: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: 12px;
    padding: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
}

.progress-steps {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.progress-steps::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--border-light);
    z-index: 1;
}

.progress-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--bg-white);
    padding: 0 var(--spacing-sm);
    z-index: 2;
    position: relative;
}

.step-circle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-gray);
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    transition: all 0.3s ease;
}

.progress-step.active .step-circle {
    background: var(--primary-blue);
    color: white;
}

.progress-step.completed .step-circle {
    background: var(--success);
    color: white;
}

.step-label {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    text-align: center;
}

.progress-step.active .step-label {
    color: var(--primary-blue);
    font-weight: 500;
}

/* Results Summary */
.results-summary {
    background: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: 12px;
    padding: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
}

.summary-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
}

.summary-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
}

.summary-icon.success {
    background: #d1fae5;
    color: var(--success);
}

.summary-icon.error {
    background: #fee2e2;
    color: var(--error);
}

.summary-content h3 {
    margin: 0 0 var(--spacing-xs) 0;
}

.summary-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.metric-card {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--bg-light);
    border-radius: 8px;
}

.metric-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-blue);
    display: block;
}

.metric-label {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}



/* Alert Boxes */
.alert {
    padding: var(--spacing-md);
    border-radius: 8px;
    margin: var(--spacing-md) 0;
    border-left: 4px solid;
}

/* Loading States */
.spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-light);
    border-top: 2px solid var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: inline-block;
    margin-right: var(--spacing-sm);
}

.spinner-large {
    width: 30px;
    height: 30px;
    border: 3px solid var(--border-light);
    border-top: 3px solid var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 10px;
}

@media (max-width: 768px) {
    /* Container & Layout */
    .container {
        padding: 0 var(--spacing-md);
    }

    /* Header */
    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .nav {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.25rem;
    }
    
    .nav-link {
        font-size: 0.8rem;
        padding: 0.5rem 0.75rem;
    }
    
    .logo {
        font-size: 2rem;
    }
    
    .nav-link-two-line .line1 {
        font-size: 0.8rem;
    }
    
    .nav-link-two-line .line2 {
        font-size: 0.7rem;
    }

    /* Hero Section */
    .hero h1 {
        font-size: var(--font-size-3xl);
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    /* Grid Layouts */
    .overview-grid {
        grid-template-columns: 1fr;
    }

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

    .dataset-card h3 {
        font-size: var(--font-size-lg);
        line-height: 1.2;
    }

    /* Submit Section */
    .submit-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    /* Leaderboard */
    .leaderboard-controls {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: stretch;
    }
    
    .control-group {
        flex-direction: column;
        align-items: stretch;
    }
    
    .control-select {
        width: 100%;
    }

    .leaderboard-container {
        margin: 0 -1rem;
        border-radius: 0;
    }
    
    
    .score-badge {
        padding: 0.2rem 0.4rem;
        font-size: 0.75rem;
        min-width: 40px;
    }

    /* Download & Progress */
    .download-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .summary-metrics {
        grid-template-columns: 1fr;
    }
    
    .progress-steps {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .progress-steps::before {
        display: none;
    }

    /* CSV & Code */
    .csv-preview {
        font-size: var(--font-size-xs);
    }
    
    .workflow-list li {
        padding-left: var(--spacing-xl);
    }

    /* Footer */
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-style: italic;
}

/* Progress Tracker */
.progress-tracker {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: var(--spacing-xl);
    border: 2px solid var(--accent-blue);
}

.progress-bar {
    width: 100%;
    height: 20px;
    background: var(--border-light);
    border-radius: 10px;
    overflow: hidden;
    margin: 1rem 0;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-blue), #28a745);
    transition: width 0.3s ease;
    width: 0%;
}

.progress-text {
    text-align: center;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.missing-datasets {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-blue);
}

.dataset-tag {
    display: inline-block;
    background: var(--accent-blue);
    color: white;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    margin: 0.2rem;
    font-size: 0.85rem;
}

.upload-instructions {
    background: #e3f2fd;
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid #2196f3;
    margin-bottom: 1rem;
}
/* Individual Testing Styles */
.test-results {
    background: var(--bg-light);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: var(--spacing-lg);
}

.results-header {
    border-bottom: 1px solid #dee2e6;
    padding-bottom: 15px;
    margin-bottom: 20px;
}

.results-header h4 {
    margin: 0;
    color: var(--primary-blue);
}

.performance-summary {
    background: var(--bg-light);
    border: 1px solid var(--border-light);
    border-radius: 6px;
    padding: var(--spacing-md);
}

.performance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 10px;
    margin-top: 10px;
}

.performance-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px;
    background: white;
    border-radius: 4px;
    font-size: 0.9rem;
}

.performance-badge {
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* Status Badge Styles */
.status-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 9999px;
    font-size: 12px;
    font-weight: 600;
}

.status-badge.complete {
    background-color: #d1fae5;
    color: #065f46;
}

.status-badge.partial {
    background-color: #dbeafe;
    color: #1e40af;
}

.badge-excellent { background: #d4edda; color: #155724; }
.badge-good { background: #cce5ff; color: #004085; }
.badge-fair { background: #fff3cd; color: #856404; }
.badge-poor { background: #f8d7da; color: #721c24; }

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.metric-card {
    background: white;
    border: 1px solid var(--border-light);
    border-radius: 6px;
    padding: var(--spacing-md);
    text-align: center;
}

.metric-card h6 {
    margin: 0 0 8px 0;
    font-size: 0.8rem;
    color: #6c757d;
    font-weight: 500;
}

.metric-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-blue);
}

.evaluation-details {
    background: var(--bg-gray);
    border: 1px solid var(--border-gray);
    border-radius: 6px;
    padding: var(--spacing-md);
}

.details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 10px;
    margin-top: 10px;
}

.detail-item {
    background: white;
    padding: 8px;
    border-radius: 4px;
    font-size: 0.9rem;
}

.detail-label {
    font-weight: 500;
    color: #495057;
}

.detail-value {
    color: #6c757d;
}

.warnings {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 6px;
    padding: var(--spacing-md);
    color: #856404;
}

.loading-state {
    text-align: center;
    padding: var(--spacing-lg);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Navigation Dropdown */
.nav-dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-toggle {
    position: relative;
}

.dropdown-toggle::after {
    content: '▼';
    font-size: 0.8em;
    margin-left: 0.5rem;
    transition: transform 0.2s ease;
}

.nav-dropdown:hover .dropdown-toggle::after {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    border: 1px solid var(--border-light);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    min-width: 160px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
    z-index: 1000;
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: background-color 0.2s ease;
    border-bottom: 1px solid var(--border-light);
}

.dropdown-item:last-child {
    border-bottom: none;
}

.dropdown-item:hover {
    background: var(--bg-light);
    color: var(--primary-blue);
}


.nav-link.active {
    color: var(--primary-blue);
    font-weight: 600;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--primary-blue);
    color: var(--primary-blue);
    transition: all 0.3s ease;
}

.btn-outline:hover {
    background: var(--primary-blue);
    color: white;
}

.dataset-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.dataset-actions .btn {
    flex: 1;
    min-width: 120px;
}

@media (max-width: 768px) {
    .dataset-actions {
        flex-direction: column;
    }
    
    .dataset-actions .btn {
        width: 100%;
    }


.metric-cell {
    text-align: center !important;
    font-weight: 600 !important;
    color: #dc2626 !important;
    background: #fee2e2 !important;
    padding: 0.35rem 0.5rem !important;
    border-radius: 3px !important;
}

}