/* ===== CSS VARIABLES ===== */
:root {
    /* Colors */
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --primary-light: #7c8ff0;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --text-primary: #ffffff;
    --text-secondary: #e0e7ff;
    --text-muted: #a5b4fc;
    --bg-dark: #0f0f23;
    --bg-darker: #08081a;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-bg: linear-gradient(180deg, #0f0f23 0%, #1a1a3e 100%);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 3rem;
    --font-size-4xl: 4rem;
    
    /* Effects */
    --blur-sm: 10px;
    --blur-md: 20px;
    --blur-lg: 40px;
    --transition-speed: 0.3s;
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 30px rgba(102, 126, 234, 0.3);
}

/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-bg);
    z-index: -2;
}

body::after {
    content: '';
    position: fixed;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
    animation: float 20s ease-in-out infinite;
    z-index: -1;
}

/* ===== ANIMATIONS ===== */
@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(120deg); }
    66% { transform: translate(-20px, 20px) rotate(240deg); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

@keyframes shimmer {
    0% { background-position: -1000px 0; }
    100% { background-position: 1000px 0; }
}

/* Letter Cascade Animation - For Subtle Approach */
@keyframes letterFall {
    0% {
        opacity: 0;
        transform: translateY(-50px) rotateX(90deg);
    }
    50% {
        opacity: 0.8;
    }
    100% {
        opacity: 1;
        transform: translateY(0) rotateX(0deg);
    }
}

@keyframes letterFallOut {
    0% {
        opacity: 1;
        transform: translateY(0) rotateX(0deg);
    }
    100% {
        opacity: 0;
        transform: translateY(50px) rotateX(-90deg);
    }
}

/* Rotating Text Animation - For Bold Approach */
@keyframes fadeSlideIn {
    0% {
        opacity: 0;
        transform: translateY(30px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeSlideOut {
    0% {
        opacity: 1;
        transform: translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateY(-30px);
    }
}

/* Typewriter effect */
@keyframes typewriter {
    from {
        width: 0;
    }
    to {
        width: 100%;
    }
}

@keyframes deletewriter {
    from {
        width: 100%;
    }
    to {
        width: 0;
    }
}

@keyframes blinkCursor {
    0%, 100% { border-right-color: var(--primary-color); }
    50% { border-right-color: transparent; }
}

/* Letter styling */
.letter-cascade span,
.rotating-title span {
    display: inline-block;
    opacity: 0;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.letter-cascade span.fall-in {
    animation: letterFall 0.6s ease-out forwards;
}

.letter-cascade span.fall-out {
    animation: letterFallOut 0.5s ease-in forwards;
}

/* Rotating subtitle */
.rotating-subtitle {
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.subtitle-text {
    display: inline-block;
    overflow: hidden;
    white-space: nowrap;
    border-right: 3px solid var(--primary-color);
    width: fit-content;
}

.subtitle-text.typing {
    animation: typewriter var(--typing-duration, 2s) steps(var(--char-count)) forwards, blinkCursor 0.75s step-end infinite;
}

.subtitle-text.deleting {
    animation: deletewriter var(--delete-duration, 1s) steps(var(--char-count)) forwards, blinkCursor 0.75s step-end infinite;
}

.subtitle-text.typing-complete {
    border-right-color: transparent;
}

.subtitle-text.fade-out {
    animation: fadeSlideOut 0.5s ease-in forwards;
    border-right-color: transparent;
}

.animate-fade-in {
    animation: fadeInUp 1s ease-out forwards;
}

.animate-fade-in-delay-1 {
    animation: fadeInUp 1s ease-out 0.2s forwards;
    opacity: 0;
}

.animate-fade-in-delay-2 {
    animation: fadeInUp 1s ease-out 0.4s forwards;
    opacity: 0;
}

.animate-fade-in-delay-3 {
    animation: fadeInUp 1s ease-out 0.6s forwards;
    opacity: 0;
}

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

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-md));
    -webkit-backdrop-filter: blur(var(--blur-md));
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: var(--spacing-md);
    transition: all var(--transition-speed) ease;
    box-shadow: var(--shadow-md);
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: rgba(255, 255, 255, 0.2);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-description {
    font-size: var(--font-size-lg);
    text-align: center;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto var(--spacing-md);
    line-height: 1.8;
}

/* ===== BUTTONS ===== */
.btn-primary, .btn-secondary, .btn-large {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-speed) ease;
    cursor: pointer;
    border: none;
    font-size: var(--font-size-base);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-primary);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(102, 126, 234, 0.6);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--glass-bg);
    transform: translateY(-2px);
}

.btn-large {
    padding: 1.25rem 3rem;
    font-size: var(--font-size-lg);
}

/* ===== NAVIGATION ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(15, 15, 35, 0.8);
    backdrop-filter: blur(var(--blur-md));
    -webkit-backdrop-filter: blur(var(--blur-md));
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 0;
}

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

.logo h1 {
    font-size: var(--font-size-xl);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-speed);
    padding: 0.5rem 1rem;
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 3px;
    transition: all var(--transition-speed);
}

/* ===== HERO SECTION ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.15) 0%, transparent 50%);
    z-index: -1;
}

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

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: clamp(1.25rem, 3vw, 2rem);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-weight: 300;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== WHY SECTION ===== */
.why-section .glass-card {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.highlight-text {
    font-size: var(--font-size-xl);
    margin-top: var(--spacing-md);
    color: var(--text-primary);
}

/* ===== FEATURES SECTION ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.feature-card {
    text-align: left;
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.feature-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

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

.feature-card ul {
    list-style: none;
    padding-left: 0;
}

.feature-card li {
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
    padding-left: 1.5rem;
    position: relative;
}

.feature-card li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.feature-highlight {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: rgba(102, 126, 234, 0.1);
    border-left: 3px solid var(--primary-color);
    border-radius: 5px;
    color: var(--text-secondary);
}

/* ===== AUDIENCE SECTION ===== */
.audience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.audience-card {
    text-align: center;
}

.audience-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-secondary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.audience-card h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.audience-card ul {
    list-style: none;
    text-align: left;
    padding-left: 0;
}

.audience-card li {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    padding-left: 1.5rem;
    position: relative;
}

.audience-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* ===== EDUCATION SECTION ===== */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.education-card h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
    background: var(--gradient-secondary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.education-card ul {
    list-style: none;
    margin: var(--spacing-md) 0;
}

.education-card li {
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
    padding-left: 1.5rem;
    position: relative;
}

.education-card li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-size: 1.5rem;
    line-height: 1.2;
}

.card-footer {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--glass-border);
    font-style: italic;
    color: var(--text-muted);
}

/* ===== ETHICS SECTION ===== */
.ethics-content {
    max-width: 700px;
    margin: 0 auto;
}

.ethics-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.ethics-icon {
    font-size: 2rem;
    color: var(--primary-color);
    flex-shrink: 0;
}

.ethics-icon i {
    display: block;
}

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

/* ===== ROADMAP SECTION ===== */
.roadmap-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.roadmap-card {
    text-align: center;
    padding: var(--spacing-lg) var(--spacing-md);
}

.roadmap-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.roadmap-card h4 {
    font-size: var(--font-size-xl);
    color: var(--text-primary);
}

/* ===== CTA SECTION ===== */
.cta-section {
    padding: var(--spacing-xl) 0;
}

.cta-card {
    text-align: center;
    padding: var(--spacing-xl);
}

.cta-card h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cta-card p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* ===== CONTACT SECTION ===== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.contact-card {
    text-align: center;
    padding: var(--spacing-lg) var(--spacing-md);
}

.contact-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.contact-card h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.contact-description {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
    line-height: 1.5;
}

.contact-card a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-speed);
    word-break: break-word;
    display: inline-block;
    margin-top: var(--spacing-xs);
}

.contact-card a:hover {
    color: var(--primary-light);
    text-decoration: underline;
}

/* ===== FOOTER ===== */
.footer {
    background: rgba(8, 8, 26, 0.8);
    border-top: 1px solid var(--glass-border);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    margin-top: var(--spacing-xl);
}

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

.footer-section h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.footer-section p {
    color: var(--text-muted);
    line-height: 1.6;
}

.footer-section a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-speed);
}

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

.footer-legal {
    font-size: 0.9rem;
    margin-top: var(--spacing-sm);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--glass-border);
    color: var(--text-muted);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(15, 15, 35, 0.95);
        backdrop-filter: blur(var(--blur-md));
        flex-direction: column;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--glass-border);
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-menu-toggle {
        display: flex;
    }

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

    .hero-cta .btn-large {
        width: 100%;
        max-width: 300px;
    }

    .features-grid,
    .audience-grid,
    .education-grid {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: var(--font-size-2xl);
    }

    .education-grid {
        gap: var(--spacing-md);
    }

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

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .glass-card {
        padding: var(--spacing-sm);
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for accessibility */
a:focus,
button:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* ===== SCROLL BEHAVIOR ===== */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-darker);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-light);
}