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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --dark-color: #1f2937;
    --light-color: #f9fafb;
    --border-color: #e5e7eb;
    --text-color: #374151;
    --text-light: #6b7280;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px 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);
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Navigation */
header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    padding: 1rem 0;
}

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

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
    opacity: 0.8;
    text-decoration: underline;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 800;
}

.hero .subtitle {
    font-size: 1.25rem;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
    opacity: 0.95;
}

/* Calculator Section */
.calculator-section {
    padding: 3rem 0;
    background-color: var(--light-color);
}

.calculator-wrapper {
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    padding: 2rem;
    margin-bottom: 3rem;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
    flex-wrap: wrap;
}

.tab-btn {
    padding: 1rem 1.5rem;
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.3s;
    position: relative;
    bottom: -2px;
}

.tab-btn:hover {
    color: var(--primary-color);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tab-content h2 {
    color: var(--dark-color);
    margin-bottom: 0.5rem;
    font-size: 2rem;
}

.description {
    color: var(--text-light);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

/* Calculator Grid */
.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.section-card {
    background: var(--light-color);
    padding: 1.5rem;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    transition: border-color 0.3s;
}

.section-card:hover {
    border-color: var(--primary-color);
}

.section-card h3 {
    color: var(--dark-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.input-group {
    margin-bottom: 1rem;
}

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

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

.input-group input[type="number"] {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.input-group input[type="number"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

.range-info {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: var(--text-light);
}

/* Calculate Button */
.calculate-btn {
    width: 100%;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: var(--shadow);
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

/* Results */
.results {
    margin-top: 2rem;
    padding: 2rem;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-radius: 12px;
    border: 2px solid #bae6fd;
}

.results.hidden {
    display: none;
}

.results h3 {
    color: var(--dark-color);
    margin-bottom: 1.5rem;
    font-size: 1.75rem;
    text-align: center;
}

.results h4 {
    color: var(--dark-color);
    margin: 1.5rem 0 1rem;
    font-size: 1.25rem;
}

.score-display {
    text-align: center;
    margin-bottom: 2rem;
}

.total-score {
    display: inline-block;
    padding: 2rem 3rem;
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

.score-label {
    display: block;
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.score-value {
    display: block;
    font-size: 4rem;
    font-weight: 800;
    color: var(--primary-color);
    line-height: 1;
}

.score-range {
    display: block;
    font-size: 0.875rem;
    color: var(--text-light);
    margin-top: 0.5rem;
}

.section-scores {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.score-item {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
}

.section-label {
    font-weight: 600;
    color: var(--text-color);
}

.section-score {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Subscores */
.subscores {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

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

.subscore-item {
    display: flex;
    justify-content: space-between;
    padding: 1rem;
    background: var(--light-color);
    border-radius: 6px;
}

.subscore-item span:last-child {
    font-weight: 700;
    color: var(--primary-color);
}

/* Score Analysis */
.score-analysis {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
}

#analysis-text {
    color: var(--text-color);
    line-height: 1.8;
}

#analysis-text p {
    margin-bottom: 1rem;
}

#analysis-text strong {
    color: var(--dark-color);
}

/* Superscore */
.test-entry {
    background: var(--light-color);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border: 2px solid var(--border-color);
}

.test-entry h3 {
    color: var(--dark-color);
    margin-bottom: 1rem;
}

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

#superscore-breakdown {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1.5rem;
}

/* Percentile Calculator */
.percentile-calculator {
    max-width: 600px;
    margin: 0 auto 2rem;
}

.percentile-display {
    text-align: center;
    margin-bottom: 2rem;
}

.percentile-info {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.percentile-info.highlight {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    border: 2px solid #fbbf24;
}

.percentile-label {
    font-weight: 600;
    color: var(--text-color);
    font-size: 1.125rem;
}

.percentile-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.percentile-explanation {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    text-align: left;
    line-height: 1.8;
}

.percentile-chart {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
}

.chart-container {
    position: relative;
    height: 300px;
    margin-top: 1rem;
}

/* College Estimator */
.college-calculator {
    max-width: 600px;
    margin: 0 auto 2rem;
}

.college-tiers {
    display: grid;
    gap: 1.5rem;
}

.tier {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid;
}

.tier.safety {
    border-left-color: var(--success-color);
}

.tier.target {
    border-left-color: var(--warning-color);
}

.tier.reach {
    border-left-color: var(--danger-color);
}

.tier h4 {
    margin: 0 0 0.5rem 0;
    font-size: 1.5rem;
}

.tier-description {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.college-list {
    display: grid;
    gap: 0.75rem;
}

.college-item {
    padding: 1rem;
    background: var(--light-color);
    border-radius: 6px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.college-name {
    font-weight: 600;
    color: var(--dark-color);
}

.college-stats {
    text-align: right;
    font-size: 0.875rem;
    color: var(--text-light);
}

.admission-chance {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-top: 0.25rem;
}

.chance-high {
    background-color: #d1fae5;
    color: #065f46;
}

.chance-medium {
    background-color: #fef3c7;
    color: #92400e;
}

.chance-low {
    background-color: #fee2e2;
    color: #991b1b;
}

/* Content Section */
.content-section {
    padding: 4rem 0;
    background: white;
}

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

.content-article h2 {
    font-size: 2rem;
    color: var(--dark-color);
    margin-bottom: 1rem;
    margin-top: 2rem;
}

.content-article h2:first-child {
    margin-top: 0;
}

.content-article h3 {
    font-size: 1.5rem;
    color: var(--dark-color);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.content-article p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.content-article ul,
.content-article ol {
    margin-bottom: 1rem;
    padding-left: 2rem;
}

.content-article li {
    margin-bottom: 0.5rem;
    line-height: 1.8;
}

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

/* AdSense Ad Section */
.ad-section {
    padding: 2rem 0;
    background: var(--light-color);
}

.ad-container {
    max-width: 100%;
    margin: 0 auto;
    text-align: center;
    min-height: 90px;
}

/* Keywords Section */
.keywords-section {
    padding: 3rem 0;
    background: var(--light-color);
}

.keywords-section h2 {
    text-align: center;
    color: var(--dark-color);
    margin-bottom: 2rem;
    font-size: 2rem;
}

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

.keyword-link {
    padding: 1rem;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    text-align: center;
    transition: all 0.3s;
}

.keyword-link:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* Footer */
footer {
    background: var(--dark-color);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.footer-section p {
    color: #d1d5db;
    line-height: 1.6;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: #d1d5db;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 1rem;
    text-align: center;
    color: #9ca3af;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero .subtitle {
        font-size: 1rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .tabs {
        gap: 0.5rem;
    }
    
    .tab-btn {
        padding: 0.75rem 1rem;
        font-size: 0.875rem;
    }
    
    .calculator-grid {
        grid-template-columns: 1fr;
    }
    
    .score-value {
        font-size: 3rem;
    }
    
    .total-score {
        padding: 1.5rem 2rem;
    }
    
    .calculator-wrapper {
        padding: 1rem;
    }
    
    .content-article h2 {
        font-size: 1.5rem;
    }
    
    .content-article h3 {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.25rem;
    }
    
    .nav-links {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    
    .nav-links a {
        font-size: 0.875rem;
    }
}

/* Print Styles */
@media print {
    header,
    footer,
    .calculate-btn,
    .keywords-section {
        display: none;
    }
    
    .results {
        page-break-inside: avoid;
    }
}