/* ===================================
   CSS Variables & Root Styles
   =================================== */
:root {
    /* Color Palette - Fresh & Modern */
    --primary-dark: #1a1a2e;
    --primary-blue: #0f4c75;
    --accent-teal: #3282b8;
    --accent-orange: #ff6b35;
    --accent-yellow: #f7b731;
    --light-bg: #f8f9fa;
    --white: #ffffff;
    --gray-100: #f1f3f5;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-600: #6c757d;
    --gray-800: #343a40;
    
    /* Typography */
    --font-display: 'Poppins', sans-serif;
    --font-body: 'Poppins', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.15);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===================================
   Reset & Base Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    line-height: 1.2;
    font-weight: 400;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-base);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    box-shadow: var(--shadow-sm);
    animation: slideDown 0.5s ease;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent-teal), var(--primary-blue));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: 700;
    font-size: 1.2rem;
    font-family: var(--font-display);
    box-shadow: var(--shadow-md);
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-primary {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-dark);
}

.logo-tagline {
    font-size: 0.75rem;
    color: var(--gray-600);
    font-weight: 500;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-link {
    font-weight: 500;
    color: var(--gray-800);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-orange);
    transition: var(--transition-base);
    transform: translateX(-50%);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

.nav-link:hover {
    color: var(--accent-orange);
}

.nav-link.active {
    color: var(--accent-teal);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-dark);
    border-radius: 2px;
    transition: var(--transition-base);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: var(--spacing-xl) var(--spacing-md);
    margin-top: 70px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    z-index: -1;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.hero-shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.4;
    animation: float 20s infinite ease-in-out;
}

.hero-shape.shape-1 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, var(--accent-teal), var(--primary-blue));
    top: -200px;
    right: -100px;
    animation-delay: 0s;
}

.hero-shape.shape-2 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, var(--accent-orange), var(--accent-yellow));
    bottom: -150px;
    left: -100px;
    animation-delay: 5s;
}

.hero-shape.shape-3 {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--accent-teal), var(--accent-orange));
    top: 50%;
    left: 10%;
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    25% {
        transform: translate(30px, 30px) rotate(90deg);
    }
    50% {
        transform: translate(-20px, 50px) rotate(180deg);
    }
    75% {
        transform: translate(40px, -30px) rotate(270deg);
    }
}

.hero-content {
    max-width: 900px;
    text-align: center;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--white);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-md);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--primary-blue);
    animation: fadeInUp 0.8s ease 0.2s both;
}

.badge-icon {
    font-size: 1.2rem;
}

.hero-title {
    font-size: clamp(3rem, 8vw, 6rem);
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.title-line {
    display: block;
    animation: fadeInUp 0.8s ease both;
}

.title-line:nth-child(1) {
    animation-delay: 0.4s;
}

.title-line:nth-child(2) {
    animation-delay: 0.6s;
}

.title-line.highlight {
    background: linear-gradient(135deg, var(--accent-teal), var(--accent-orange));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.hero-description {
    font-size: 1.25rem;
    color: var(--gray-600);
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
    animation: fadeInUp 0.8s ease 0.8s both;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 1s both;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-teal));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--gray-600);
    font-weight: 500;
    margin-top: var(--spacing-xs);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--gray-600);
    font-size: 0.85rem;
    animation: fadeIn 1s ease 1.5s both;
}

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

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--accent-teal);
    border-bottom: 2px solid var(--accent-teal);
    transform: rotate(45deg);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: rotate(45deg) translateY(0);
    }
    40% {
        transform: rotate(45deg) translateY(10px);
    }
    60% {
        transform: rotate(45deg) translateY(5px);
    }
}

/* ===================================
   Introduction Section
   =================================== */
.introduction {
    padding: var(--spacing-xl) 0;
    background: var(--white);
}

.intro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.section-label {
    display: inline-block;
    color: var(--accent-orange);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.85rem;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--spacing-md);
    color: var(--primary-dark);
}

.section-description {
    font-size: 1.1rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.intro-visual {
    display: grid;
    gap: var(--spacing-md);
}

.visual-card {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
}

.visual-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.visual-card.card-1 {
    animation: fadeInRight 0.8s ease 0.2s both;
}

.visual-card.card-2 {
    animation: fadeInRight 0.8s ease 0.4s both;
}

.visual-card.card-3 {
    animation: fadeInRight 0.8s ease 0.6s both;
}

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

.card-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.visual-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--primary-dark);
}

.visual-card p {
    color: var(--gray-600);
}

/* ===================================
   About Section
   =================================== */
.about {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.about-image {
    position: relative;
}

.image-frame {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.image-frame::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--accent-teal), var(--primary-blue));
    opacity: 0.1;
}

.university-badge {
    text-align: center;
    z-index: 1;
}

.badge-title {
    display: block;
    font-family: var(--font-display);
    font-size: 4rem;
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-teal));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.badge-subtitle {
    display: block;
    font-size: 1.2rem;
    color: var(--gray-600);
    font-weight: 500;
}

.about-text {
    font-size: 1.1rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.about-text strong {
    color: var(--primary-blue);
    font-weight: 600;
}

.about-text em {
    color: var(--accent-teal);
}

.about-highlights {
    display: grid;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.highlight-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.highlight-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.highlight-content h4 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xs);
    color: var(--primary-dark);
}

.highlight-content p {
    color: var(--gray-600);
}

/* ===================================
   What Is Section
   =================================== */
.what-is {
    padding: var(--spacing-xl) 0;
    background: var(--white);
}

.what-is-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.feature-card {
    background: linear-gradient(135deg, var(--gray-100), var(--white));
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 2px solid transparent;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-teal), var(--accent-orange));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition-base);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--accent-teal);
}

.feature-number {
    font-family: var(--font-display);
    font-size: 3rem;
    color: var(--gray-300);
    margin-bottom: var(--spacing-sm);
}

.feature-title {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-dark);
}

.feature-description {
    color: var(--gray-600);
    line-height: 1.8;
}

.platform-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    background: linear-gradient(135deg, var(--primary-blue), var(--accent-teal));
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    color: var(--white);
}

.showcase-content h3 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.showcase-content p {
    margin-bottom: var(--spacing-md);
    opacity: 0.9;
    line-height: 1.8;
}

.benefit-list {
    list-style: none;
    display: grid;
    gap: var(--spacing-sm);
}

.benefit-list li {
    padding-left: var(--spacing-md);
    position: relative;
}

.benefit-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-yellow);
    font-weight: bold;
}

.phone-mockup {
    background: var(--primary-dark);
    border-radius: var(--radius-xl);
    padding: var(--spacing-sm);
    box-shadow: var(--shadow-xl);
}

.phone-screen {
    background: var(--white);
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 9/16;
}

.app-preview {
    padding: var(--spacing-md);
}

.app-header {
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.app-content {
    display: grid;
    gap: var(--spacing-sm);
}

.order-card {
    background: var(--gray-100);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    color: var(--primary-dark);
}

/* ===================================
   Journal Teaser Section
   =================================== */
.journal-teaser {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

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

.meeting-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.meeting-card {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    display: flex;
    gap: var(--spacing-md);
    transition: var(--transition-base);
    text-align: left;
}

.meeting-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.meeting-date {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent-teal), var(--primary-blue));
    color: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    min-width: 80px;
}

.date-day {
    font-size: 2rem;
    font-weight: 700;
    font-family: var(--font-display);
}

.date-month {
    font-size: 0.85rem;
    text-transform: uppercase;
}

.meeting-info h4 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-xs);
    color: var(--primary-dark);
}

.meeting-info p {
    color: var(--gray-600);
    line-height: 1.6;
}

.cta-button {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent-teal), var(--primary-blue));
    color: var(--white);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-xl);
    font-weight: 600;
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    margin-top: var(--spacing-md);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* ===================================
   Team Section
   =================================== */
.team {
    padding: var(--spacing-xl) 0;
    background: var(--white);
}

.team-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.team-note {
    text-align: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--gray-100), var(--white));
    border-radius: var(--radius-md);
    border-left: 4px solid var(--accent-orange);
}

.team-note p {
    font-size: 1.1rem;
    color: var(--gray-600);
}

.team-note a {
    color: var(--accent-teal);
    font-weight: 600;
    text-decoration: underline;
}

.team-note a:hover {
    color: var(--accent-orange);
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--primary-dark);
    color: var(--white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-brand {
    grid-column: span 1;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    font-family: var(--font-display);
    font-size: 1.5rem;
}

.footer-logo .logo-icon {
    width: 40px;
    height: 40px;
    font-size: 1rem;
}

.footer-description {
    color: var(--gray-400);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.footer-badges {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.footer-badge {
    background: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

.footer-links h4 {
    margin-bottom: var(--spacing-md);
    font-size: 1.2rem;
}

.footer-links ul {
    list-style: none;
    display: grid;
    gap: var(--spacing-sm);
}

.footer-links a,
.footer-links li {
    color: var(--gray-400);
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: var(--accent-orange);
    padding-left: var(--spacing-xs);
}

.footer-contact h4 {
    margin-bottom: var(--spacing-md);
    font-size: 1.2rem;
}

.domain-highlight {
    font-family: var(--font-display);
    font-size: 1.8rem;
    color: var(--accent-teal);
    margin-bottom: var(--spacing-sm);
}

.footer-note {
    color: var(--gray-400);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--gray-400);
    font-size: 0.9rem;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 968px) {
    .navbar {
        padding: 0.75rem 0;
    }
    
    .nav-container {
        padding: 0 1rem;
    }
    
    .logo-icon {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    
    .logo-primary {
        font-size: 1.25rem;
    }
    
    .logo-tagline {
        font-size: 0.65rem;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        padding: 5rem 1.5rem 2rem;
        box-shadow: -8px 0 24px rgba(0, 0, 0, 0.15);
        transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        overflow-y: auto;
        z-index: 999;
        gap: 0;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-link {
        width: 100%;
        padding: 1rem 1.25rem;
        border-radius: var(--radius-sm);
        font-size: 1rem;
        font-weight: 500;
        display: flex;
        align-items: center;
        transition: all 0.2s ease;
        border-left: 3px solid transparent;
    }
    
    .nav-link::after {
        display: none;
    }
    
    .nav-link:hover {
        background: linear-gradient(90deg, rgba(50, 130, 184, 0.08), transparent);
        border-left-color: var(--accent-teal);
        padding-left: 1.5rem;
    }
    
    .nav-link.active {
        background: linear-gradient(90deg, rgba(50, 130, 184, 0.12), transparent);
        border-left-color: var(--accent-orange);
        color: var(--accent-orange);
    }
    
    .menu-toggle {
        display: flex;
        position: relative;
        z-index: 1001;
        width: 40px;
        height: 40px;
        align-items: center;
        justify-content: center;
        border-radius: var(--radius-sm);
        transition: background 0.2s ease;
    }
    
    .menu-toggle:active {
        background: rgba(0, 0, 0, 0.05);
    }
    
    .menu-toggle span {
        width: 22px;
        height: 2px;
        background: var(--primary-dark);
        border-radius: 2px;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        position: absolute;
    }
    
    .menu-toggle span:nth-child(1) {
        transform: translateY(-6px);
    }
    
    .menu-toggle span:nth-child(3) {
        transform: translateY(6px);
    }
    
    .menu-toggle.active span:nth-child(1) {
        transform: translateY(0) rotate(45deg);
    }
    
    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
        transform: scale(0);
    }
    
    .menu-toggle.active span:nth-child(3) {
        transform: translateY(0) rotate(-45deg);
    }
    
    /* Mobile Overlay */
    .nav-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(0, 0, 0, 0.5);
        backdrop-filter: blur(4px);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: 998;
    }
    
    .nav-overlay.active {
        opacity: 1;
        visibility: visible;
    }
    
    .intro-grid,
    .about-grid,
    .platform-showcase {
        grid-template-columns: 1fr;
    }
    
    .hero-stats {
        gap: var(--spacing-md);
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   Utility Classes
   =================================== */
.text-center {
    text-align: center;
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }