/* ============================================
   CSS Variables & Root Styles
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #ec4899;
    --accent-color: #f59e0b;
    --dark-bg: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --border-color: #334155;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
}
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--dark-bg) 0%, #1a1f3a 100%);
    color: var(--text-primary);
    line-height: 1.6;
}
/* Navigation */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}
.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    cursor: pointer;
}
.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}
.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
    font-weight: 500;
}
.nav-links a:hover {
    color: var(--primary-color);
}
/* Button Styles */
.cta-button {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 0.7rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}
.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
}
.secondary-button {
    background: transparent;
    color: var(--primary-color);
    padding: 0.7rem 1.5rem;
    border: 2px solid var(--primary-color);
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}
.secondary-button:hover {
    background: rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}
/* Hero Section */
.hero {
    margin-top: 70px;
    padding: 6rem 2rem;
    text-align: center;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(236, 72, 153, 0.1));
    border-bottom: 1px solid var(--border-color);
}
.hero-content h1 {
    font-size: clamp(2rem, 8vw, 3.5rem);
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}
.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}
/* Overview Section */
.overview {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}
.section-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}
.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    transition: all 0.3s ease;
}
.stat-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.1);
    transform: translateY(-5px);
}
.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}
.stat-label {
    color: var(--text-secondary);
    font-weight: 500;
}
/* STLC Phases Section */
.stlc {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}
.stlc-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.phases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}
.phase-card {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    transition: all 0.3s ease;
    cursor: pointer;
}
.phase-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 15px 40px rgba(99, 102, 241, 0.2);
    transform: translateY(-8px);
}
.phase-number {
    display: inline-flex;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin-bottom: 1rem;
}
.phase-title {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    font-weight: 600;
}
.phase-challenge, .phase-solutions {
    margin-bottom: 1rem;
}
.challenge-label, .solution-label {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}
.challenge-label {
    color: var(--warning-color);
}
.solution-label {
    color: var(--primary-color);
}
.challenge-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}
.phase-solutions {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}
.solution-item {
    display: flex;
    align-items: flex-start;
    margin: 0.5rem 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}
.solution-bullet {
    color: var(--success-color);
    margin-right: 0.5rem;
    font-weight: bold;
    flex-shrink: 0;
}
/* Mission Section */
.mission {
    padding: 4rem 2rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(236, 72, 153, 0.1));
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    margin: 2rem 0;
}
.mission-container {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}
.mission-title {
    font-size: 2rem;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.mission-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}
.mission-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 1rem;
    transition: all 0.3s ease;
}
.mission-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
}
.mission-item-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}
.mission-item-text {
    color: var(--text-secondary);
    line-height: 1.6;
}
/* Future Section */
.future {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}
.future-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.future-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin: 2rem 0;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}
.comparison-column {
    text-align: center;
}
.comparison-title {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    font-weight: 600;
}
.comparison-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 0.5rem;
    font-size: 0.95rem;
}
.wrong {
    color: var(--error-color);
}
.right {
    color: var(--success-color);
}
/* CTA Section */
.cta-section {
    padding: 4rem 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 1rem;
    text-align: center;
    max-width: 900px;
    margin: 4rem auto;
}
.cta-section h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: white;
}
.cta-section p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: rgba(255, 255, 255, 0.9);
}
/* Footer */
footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 3rem 2rem;
    text-align: center;
    color: var(--text-secondary);
}
.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}
.footer-logo {
    font-size: 1.3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}
.footer-text {
    margin-bottom: 2rem;
    line-height: 1.6;
}
.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}
.footer-links a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}
.footer-links a:hover {
    color: var(--secondary-color);
}
.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
    font-size: 0.9rem;
}
/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.fade-in {
    animation: fadeInUp 0.6s ease-out;
}
/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
}
::-webkit-scrollbar-track {
    background: var(--dark-bg);
}
::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}
/* Responsive Design */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    .nav-links {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    .hero {
        padding: 3rem 1rem;
        margin-top: 150px;
    }
    .hero-content h1 {
        font-size: 1.8rem;
    }
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    .section-title,
    .stlc-title,
    .mission-title,
    .future-title {
        font-size: 1.8rem;
    }
    .phases-grid {
        grid-template-columns: 1fr;
    }
    .future-comparison {
        grid-template-columns: 1fr;
    }
    .stats-grid {
        grid-template-columns: 1fr;
    }
}