/* CSS Variables for easy theming */
:root {
    --primary-color: #2B5A9C;
    --secondary-color: #8FBC8F;
    --accent-color: #D4A574;
    --light-accent: #A8D8DC;
    --background-color: #FAFAFA;
    --text-gray: #5a5a5a;
    --light-background: #E8E6E3;
    --warm-background: #F5E6D3;
    --warm-accent: #E8A87C;
    
    /* Dynamic Gradient Colors - Using Brand Color Palette */
    --gradient-color-1: #E8F1FB; /* Light tinted primary blue */
    --gradient-color-2: #F0F8F0; /* Light tinted secondary green */
    --gradient-color-3: #F9F3EB; /* Light tinted accent gold */
    --gradient-color-4: #EDF7F8; /* Light tinted light accent */
    --gradient-color-5: #F5E6D3; /* Existing warm background */
    --main-bg-color: linear-gradient(135deg, 
        var(--gradient-color-1) 0%, 
        var(--gradient-color-2) 25%, 
        var(--gradient-color-3) 50%, 
        var(--gradient-color-4) 75%, 
        var(--gradient-color-5) 100%);
    
    /* Section-specific overlay opacities for readability */
    --hero-overlay: rgba(255, 255, 255, 0.3);
    --content-overlay: rgba(255, 255, 255, 0.4);
    --light-overlay: rgba(255, 255, 255, 0.5);
    --form-overlay: rgba(255, 255, 255, 0.6);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--primary-color);
    /* Beautiful brand gradient background */
    background: var(--main-bg-color);
    min-height: 100vh;
}

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

/* Header */
header {
    background: var(--primary-color);
    color: var(--background-color);
    padding: 0.7rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(43, 90, 156, 0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-container {
    display: flex;
    align-items: center;
    margin: -10px 0;
    margin-left: 2rem;
}

.logo-image {
    height: 80px;
    width: auto;
    object-fit: contain;
}

.logo-text {
    color: var(--background-color);
    font-size: 1.4rem;
    font-weight: 600;
    white-space: nowrap;
}

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

.nav-links a {
    color: var(--background-color);
    text-decoration: none;
    transition: color 0.3s;
    font-weight: 500;
}

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

/* Hero Section */
.hero {
    padding: 60px 0 40px;
    margin-top: 70px;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--hero-overlay);
    pointer-events: none;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 2.6rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-weight: 700;
    max-width: 900px;
}

.hero .subtitle {
    font-size: 1.1rem;
    color: #1a4480;
    margin-bottom: 1.5rem;
    max-width: 800px;
    line-height: 1.6;
}

.hero-cta {
    background: var(--secondary-color);
    color: var(--background-color);
    padding: 1rem 2.5rem;
    border: none;
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

.hero-cta:hover {
    background: #7aa87a;
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(143, 188, 143, 0.3);
}

/* Elevate Advantage Section */
.advantage {
    padding: 50px 0;
    position: relative;
}

.advantage::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--content-overlay);
    pointer-events: none;
}

.advantage .container {
    position: relative;
    z-index: 1;
}

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

.advantage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.advantage-card {
    background: var(--background-color);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(212, 165, 116, 0.1);
    text-align: left;
    border-left: 4px solid var(--accent-color);
    transition: all 0.3s;
}

.advantage-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(212, 165, 116, 0.2);
}

.advantage-card .icon {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.advantage-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.8rem;
    font-size: 1.3rem;
}

.advantage-card p {
    color: var(--text-gray);
    line-height: 1.6;
}

/* HarvardX Curriculum Section */
.harvard-curriculum {
    padding: 50px 0;
    text-align: center;
    position: relative;
}

.harvard-curriculum::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--light-overlay);
    pointer-events: none;
}

.harvard-curriculum .container {
    position: relative;
    z-index: 1;
}

.harvard-curriculum h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    font-weight: 700;
}

.curriculum-content {
    max-width: 800px;
    margin: 0 auto;
}

.curriculum-content p {
    font-size: 1.1rem;
    color: var(--text-gray);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.curriculum-benefits {
    margin-top: 2.5rem;
}

.curriculum-benefits h3 {
    font-size: 1.4rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    font-weight: 600;
}

.benefits-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.benefit-item {
    background: var(--background-color);
    padding: 1.5rem;
    border-radius: 12px;
    text-align: left;
    box-shadow: 0 4px 15px rgba(43, 90, 156, 0.08);
    transition: all 0.3s ease;
    border-left: 4px solid var(--warm-accent);
}

.benefit-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(43, 90, 156, 0.15);
}

.benefit-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    display: block;
}

.benefit-content h4 {
    color: var(--primary-color);
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
    font-weight: 600;
}

.benefit-content p {
    color: var(--text-gray);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0;
}

/* Partners Logo Belt */
.partners-belt {
    padding: 30px 0;
    position: relative;
}

.partners-belt::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--content-overlay);
    pointer-events: none;
}

.partners-belt .container {
    position: relative;
    z-index: 1;
}

.partners-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 5rem;
    flex-wrap: wrap;
}

.partner-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.partner-logo img {
    max-height: 120px;
    max-width: 300px;
    width: auto;
    height: auto;
    object-fit: contain;
    filter: grayscale(20%) opacity(0.9);
    transition: all 0.3s ease;
}

.partner-logo:hover img {
    filter: grayscale(0%) opacity(1);
    transform: scale(1.05);
}

/* Programs Section */
.programs {
    padding: 50px 0;
    position: relative;
}

.programs::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--content-overlay);
    pointer-events: none;
}

.programs .container {
    position: relative;
    z-index: 1;
}

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

.programs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 1.5rem;
}

.program-card {
    background: var(--background-color);
    padding: 1.8rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(43, 90, 156, 0.1);
    transition: all 0.3s;
}

.program-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(43, 90, 156, 0.15);
}

.program-card h3 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-size: 1.6rem;
}

.program-card .description {
    color: var(--text-gray);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.program-details {
    margin: 1rem 0;
}

.program-details h4 {
    color: var(--primary-color);
    margin-bottom: 0.6rem;
    font-size: 1.1rem;
}

.program-details ul {
    list-style: none;
    margin: 0.8rem 0;
}

.program-details li {
    color: var(--text-gray);
    margin-bottom: 0.4rem;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.4;
}

.program-details li::before {
    content: "•";
    color: var(--secondary-color);
    font-weight: bold;
    position: absolute;
    left: 0;
}

.pricing {
    background: var(--warm-background);
    padding: 1.5rem;
    border-radius: 10px;
    margin: 1.5rem 0;
}

.pricing h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.pricing .fee-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    color: var(--text-gray);
}

.pricing .fee-amount {
    font-weight: 600;
    color: var(--accent-color);
}

.program-cta {
    background: var(--light-accent);
    color: var(--primary-color);
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    transition: all 0.3s;
    margin-top: 1rem;
    text-decoration: none;
    display: block;
    text-align: center;
}

.program-cta:hover {
    background: #95c9cd;
    transform: translateY(-2px);
}

/* Registration Section */
.registration {
    padding: 50px 0;
    position: relative;
}

.registration::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--form-overlay);
    pointer-events: none;
}

.registration .container {
    position: relative;
    z-index: 1;
}

.registration h2 {
    text-align: center;
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.registration .subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: #1a4480;
    margin-bottom: 2rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.registration-form {
    max-width: 600px;
    margin: 0 auto;
    background: var(--background-color);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(43, 90, 156, 0.1);
}

.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
    font-weight: 600;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid var(--light-background);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--secondary-color);
}

.submit-btn {
    background: var(--light-accent);
    color: var(--primary-color);
    padding: 1rem 2rem;
    border: none;
    border-radius: 30px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    transition: all 0.3s;
}

.submit-btn:hover {
    background: #95c9cd;
    transform: translateY(-2px);
}

.disclaimer {
    font-size: 0.9rem;
    color: #7a7a7a;
    text-align: center;
    margin-top: 1rem;
}

/* Footer */
footer {
    background: var(--primary-color);
    color: var(--background-color);
    padding: 40px 0;
    text-align: center;
}

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

.footer-section h3 {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.footer-section p {
    color: var(--light-background);
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--background-color);
    text-decoration: underline;
}

.map-container {
    margin-top: 1rem;
}

.map-container iframe {
    border: 0;
    border-radius: 8px;
    margin-top: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero {
        margin-top: 90px;
        padding: 40px 0 30px;
    }

    .hero h1 {
        font-size: 2rem;
        margin-bottom: 0.8rem;
    }

    .hero .subtitle {
        font-size: 1rem;
        margin-bottom: 1.2rem;
    }

    .advantage, .programs, .registration, .harvard-curriculum {
        padding: 35px 0;
    }

    .advantage h2, .programs h2, .registration h2, .harvard-curriculum h2 {
        font-size: 1.8rem;
        margin-bottom: 1.5rem;
    }

    .harvard-curriculum .curriculum-content p {
        font-size: 1rem;
    }

    .harvard-curriculum .curriculum-benefits h3 {
        font-size: 1.2rem;
        margin-bottom: 1.5rem;
    }

    .benefits-list {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .benefit-item {
        padding: 1.2rem;
    }

    .advantage-grid {
        gap: 1rem;
        margin-top: 1.5rem;
    }

    .advantage-card {
        padding: 1.5rem;
    }

    .program-card {
        padding: 1.5rem;
    }

    .programs-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .registration .subtitle {
        margin-bottom: 1.5rem;
    }

    .registration-form {
        padding: 1.5rem;
    }

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

    .nav-links {
        display: none;
    }

    .partners-belt {
        padding: 20px 0;
    }

    .partners-logos {
        gap: 2rem;
    }

    .partner-logo img {
        max-height: 68px;
        max-width: 180px;
    }


    .logo-container {
        justify-content: center;
        margin-left: 0;
    }

    .logo-image {
        height: 60px;
    }

    .logo-text {
        font-size: 1.1rem;
    }
}