:root {
    --bg-color: #000000;
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --accent: #10b981; /* Emerald Green */
    --border-color: #27272a;
    --card-bg: rgba(24, 24, 27, 0.4);
    --transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), background-color 0.3s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.3s cubic-bezier(0.4, 0, 0.2, 1), color 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Layout */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

section {
    padding: 6rem 0;
    border-bottom: 1px solid var(--border-color);
}

section:last-child {
    border-bottom: none;
}

/* Typography */
h1 {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.05em;
    margin-bottom: 1.5rem;
}

h2, h3 {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 1.5rem;
}

p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 1.5rem;
}

p:last-child {
    margin-bottom: 0;
}

.hero p {
    font-size: 1.25rem;
    max-width: 700px;
    margin-bottom: 2rem;
}

/* Sections */
.hero {
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    border-bottom: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
    padding-top: 5rem; /* Account for navbar */
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    background: url('chart.avif') no-repeat center right;
    background-image: -webkit-image-set(url('chart.avif') 1x, url('chart.png') 1x);
    background-image: image-set(url('chart.avif') 1x, url('chart.png') 1x);
    background-size: contain;
    opacity: 0.15;
    z-index: -1;
    mask-image: linear-gradient(to left, rgba(0,0,0,1), rgba(0,0,0,0));
    -webkit-mask-image: linear-gradient(to left, rgba(0,0,0,1), rgba(0,0,0,0));
    aspect-ratio: 16/9; /* Stabilization for CLS */
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

.navbar-inner {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0.75rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-cta {
    background-color: var(--accent);
    color: #000000;
    padding: 0.5rem 1.25rem;
    border-radius: 4px;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 700;
    transition: var(--transition);
    border: 1px solid var(--accent);
}

.nav-cta:hover {
    background-color: transparent;
    color: var(--accent);
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.4);
}

.brand {
    font-weight: 700;
    letter-spacing: -0.02em;
    font-size: 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
    cursor: pointer;
}

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

@media (min-width: 768px) {
    .message-section {
        grid-template-columns: 1fr 1.5fr;
    }
}

.message-content b {
    color: var(--text-primary);
    font-weight: 600;
}

/* Grid/Cards */
.cta-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-top: 4rem;
}

@media (min-width: 768px) {
    .cta-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 2.5rem;
    border-radius: 4px;
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.card:hover {
    border-color: var(--accent);
    border-width: 2px; /* Thicker border on hover */
    background: rgba(24, 24, 27, 0.6);
}

.card h3, .curriculum-item h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.card p {
    font-size: 1rem;
}

/* Curriculum Grid */
.curriculum-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-top: 4rem;
}

@media (min-width: 768px) {
    .curriculum-grid {
        grid-template-columns: 1fr 1fr 1fr;
    }
}

.curriculum-item {
    padding: 2.5rem;
    border: 2px solid var(--border-color); /* Constant 2px to prevent jump */
    background: var(--card-bg);
    border-radius: 4px;
    transition: var(--transition);
}

.curriculum-item:hover {
    border-color: var(--accent);
    background: rgba(24, 24, 27, 0.6);
}

.curriculum-label {
    font-size: 0.65rem;
    text-transform: uppercase;
    color: var(--accent);
    letter-spacing: 0.2rem;
    font-weight: 700;
    display: block;
    margin-bottom: 1rem;
}

.curriculum-item h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.curriculum-item p {
    font-size: 0.95rem;
    line-height: 1.6;
}

/* CTA Section & Buttons */
.cta-section {
    text-align: center;
    padding: 8rem 0;
}

.cta-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
    margin-top: 3rem;
}

@media (min-width: 768px) {
    .cta-container {
        flex-direction: row;
        justify-content: center;
        gap: 2rem;
    }
}

.btn {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1.5rem 3rem;
    border-radius: 4px;
    text-decoration: none;
    transition: var(--transition);
    width: 100%;
    max-width: 400px;
}

.btn-primary {
    background-color: var(--accent); /* Mentorship CTA: Green */
    color: #000000;
    border: 2px solid var(--accent);
    font-weight: 800;
}

.btn-secondary {
    background-color: #000000; /* Free CTA: Black */
    color: var(--accent); /* Text in Green */
    border: 2px solid var(--accent); /* Green Border */
    font-weight: 800;
}

.btn-primary:hover {
    box-shadow: 0 0 40px rgba(16, 185, 129, 0.35); /* Green glow */
}

.btn-secondary:hover {
    box-shadow: 0 0 40px rgba(16, 185, 129, 0.2); /* Green glow */
}

.btn-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.btn-subtitle {
    font-size: 0.875rem;
    opacity: 0.8;
    font-weight: 400; /* Remove boldness */
}

.card-action {
    margin-top: 2rem;
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent);
    display: flex;
    align-items: center;
}

.card-action::after {
    content: '→';
    margin-left: 0.5rem;
    transition: var(--transition);
}

.card:hover .card-action::after {
    opacity: 1; /* Keep visual indicator but no movement */
}

/* Contact */
.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item h3 {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.contact-item p {
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 500;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.reveal {
    animation: fadeIn 1s ease forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

/* Subtle Grid Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(var(--border-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
    background-size: 100px 100px;
    opacity: 0.05;
    z-index: -1;
    pointer-events: none;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-card {
    background: #000;
    border: 1px solid var(--border-color);
    padding: 3rem;
    max-width: 500px;
    width: 90%;
    border-radius: 4px;
    position: relative;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    transform: scale(0.95);
    transition: var(--transition);
}

.modal-overlay.active .modal-card {
    transform: scale(1);
    border-color: var(--accent);
    border-width: 2px;
}

.modal-close {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-card h2 {
    color: var(--accent);
    margin-bottom: 2rem;
    font-size: 1.75rem;
}

.modal-card ul {
    list-style: none;
    margin-bottom: 2.5rem;
}

.modal-card li {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.modal-card li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent);
}

.modal-card b {
    color: var(--text-primary);
}

.modal-card .procedure {
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.modal-card .procedure b {
    display: block;
    margin-bottom: 0.5rem;
}