/* Modern CSS System for ASK's Physics Academy */
:root {
    /* Color Palette */
    --bg-base: #0a0a16;
    --bg-surface: rgba(255, 255, 255, 0.03);
    --bg-surface-hover: rgba(255, 255, 255, 0.08);
    
    --primary: #4e54c8;
    --primary-glow: rgba(78, 84, 200, 0.5);
    --secondary: #8f94fb;
    --accent: #00d2ff;
    
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    
    /* Typography */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    
    /* Spacing & Layout */
    --container-width: 1200px;
    --section-padding: 100px 0;
    
    /* Transitions */
    --spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);
    --smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* Background Effects */
.bg-orb {
    position: fixed;
    border-radius: 50%;
    filter: blur(100px);
    z-index: -2;
    opacity: 0.5;
    animation: float 20s infinite alternate var(--smooth);
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
    top: -200px;
    left: -200px;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
    bottom: -100px;
    right: -100px;
    animation-delay: -5s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--secondary) 0%, transparent 70%);
    top: 40%;
    left: 30%;
    opacity: 0.3;
    animation-delay: -10s;
}

.noise-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-image: url('data:image/svg+xml,%3Csvg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg"%3E%3Cfilter id="noiseFilter"%3E%3CfeTurbulence type="fractalNoise" baseFrequency="0.65" numOctaves="3" stitchTiles="stitch"/%3E%3C/filter%3E%3Crect width="100%25" height="100%25" filter="url(%23noiseFilter)"/%3E%3C/svg%3E');
    opacity: 0.03;
    z-index: -1;
    pointer-events: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
}

h1 { font-size: 4rem; }
h2 { font-size: 3rem; }
h3 { font-size: 1.5rem; }

span {
    background: linear-gradient(135deg, var(--secondary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Layout Classes */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: var(--section-padding);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-top: 0.5rem;
}

/* Glassmorphism System */
.glass-card {
    background: var(--bg-surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    box-shadow: var(--glass-shadow);
    transition: transform 0.3s var(--smooth), background 0.3s var(--smooth), border-color 0.3s;
}

.glass-card:hover {
    background: var(--bg-surface-hover);
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 2rem;
    border-radius: 30px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s var(--spring);
    cursor: pointer;
    border: none;
    font-family: var(--font-heading);
}

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
}

.btn-glow:hover {
    box-shadow: 0 0 20px var(--primary-glow);
    transform: translateY(-2px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* Header & Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: all 0.3s var(--smooth);
    padding: 1.5rem 0;
}

.header.scrolled {
    padding: 1rem 0;
    background: rgba(10, 10, 22, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-img {
    width: 50px;
    height: 50px;
    object-fit: contain;
}

.logo-text {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.2rem;
    line-height: 1.2;
    letter-spacing: 0.5px;
}

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

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav-link:hover, .nav-link.active {
    color: white;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s var(--spring);
    border-radius: 2px;
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 120px;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(0, 210, 255, 0.1);
    border: 1px solid rgba(0, 210, 255, 0.2);
    border-radius: 20px;
    color: var(--accent);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.hero-title {
    margin-bottom: 1.5rem;
}

.hero-description {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
    max-width: 90%;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.hero-glass {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(255,255,255,0.05), rgba(255,255,255,0.01));
    box-shadow: inset 0 0 20px rgba(255,255,255,0.05), 0 20px 40px rgba(0,0,0,0.4);
}

/* Physics Animation CSS */
.physics-animation {
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.atom {
    position: relative;
    width: 200px;
    height: 200px;
}

.nucleus {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 30px;
    height: 30px;
    background: radial-gradient(circle, var(--accent), var(--primary));
    border-radius: 50%;
    box-shadow: 0 0 20px var(--accent);
}

.orbit {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
}

.orbit-1 { animation: spin 4s linear infinite; }
.orbit-2 { animation: spin 6s linear infinite reverse; transform: rotateX(60deg) rotateY(30deg); }
.orbit-3 { animation: spin 8s linear infinite; transform: rotateX(30deg) rotateY(60deg); }

.electron {
    position: absolute;
    top: -5px;
    left: 50%;
    width: 10px;
    height: 10px;
    background: white;
    border-radius: 50%;
    box-shadow: 0 0 10px white;
    transform: translateX(-50%);
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.about-card {
    padding: 2.5rem;
    text-align: center;
}

.card-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(78, 84, 200, 0.2), rgba(143, 148, 251, 0.2));
    border-radius: 15px;
    font-size: 1.8rem;
    color: var(--accent);
}

.about-card p {
    color: var(--text-secondary);
    margin-top: 1rem;
    font-size: 0.95rem;
}

/* Courses Section */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.course-card {
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.course-badge {
    align-self: flex-start;
    padding: 0.3rem 0.8rem;
    background: rgba(255,255,255,0.1);
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.course-title {
    margin-bottom: 1rem;
    color: var(--accent);
}

.course-desc {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.feature-list {
    list-style: none;
    border-top: 1px solid var(--glass-border);
    padding-top: 1.5rem;
}

.feature-list li {
    margin-bottom: 0.8rem;
    display: flex;
    align-items: flex-start;
    gap: 0.8rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.feature-list i {
    color: var(--accent);
    margin-top: 0.2rem;
}

/* Features Section */
.features-wrapper {
    padding: 4rem;
    background: linear-gradient(135deg, rgba(255,255,255,0.05), transparent);
}

.why-list {
    list-style: none;
    margin-top: 3rem;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.why-list li {
    display: flex;
    gap: 1.5rem;
}

.bullet {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    background: rgba(78, 84, 200, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
}

.why-list h4 {
    margin-bottom: 0.5rem;
}

.why-list p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Testimonials Section */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.quote-icon {
    font-size: 2rem;
    color: var(--accent);
    opacity: 0.5;
    margin-bottom: 1rem;
}

.testimonial-text {
    font-style: italic;
    font-size: 1.05rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
    line-height: 1.8;
}

.student-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    border-top: 1px solid var(--glass-border);
    padding-top: 1.5rem;
}

.student-avatar {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
}

.student-info h4 {
    margin: 0;
    color: var(--accent);
}

.student-info span {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Contact Section */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 2rem;
}

.contact-info {
    padding: 3rem;
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.icon-circle {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(255,255,255,0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--accent);
    border: 1px solid var(--glass-border);
}

.contact-item h3 {
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
}

.contact-item p {
    color: var(--text-secondary);
}

.contact-item a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

.contact-item a:hover {
    color: var(--accent);
}

.highlight-text {
    color: #4facfe !important;
    font-weight: 600;
}

.map-container {
    width: 100%;
    margin-top: 1rem;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.contact-form-container {
    padding: 3rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

input, select, textarea {
    width: 100%;
    padding: 1rem 1.2rem;
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    color: white;
    font-family: var(--font-body);
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 10px rgba(78, 84, 200, 0.2);
}

textarea {
    resize: vertical;
}

.w-100 {
    width: 100%;
}

select option {
    background: var(--bg-base);
    color: white;
}

/* Footer */
.footer {
    border-top: 1px solid var(--glass-border);
    padding: 4rem 0 2rem;
    margin-top: 4rem;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 2rem;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.footer-logo {
    width: 60px;
    filter: drop-shadow(0 0 10px rgba(255,255,255,0.2));
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--accent);
}

.footer-bottom {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.05);
    width: 100%;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Floating WhatsApp Button */
.floating-wa {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background-color: #25d366;
    color: #fff;
    border-radius: 50px;
    text-align: center;
    font-size: 30px;
    box-shadow: 0px 4px 20px rgba(37, 211, 102, 0.4);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all 0.3s var(--spring);
    animation: float-wa 3s ease-in-out infinite alternate;
}

.floating-wa:hover {
    background-color: #128c7e;
    color: #fff;
    transform: scale(1.1);
    box-shadow: 0px 6px 25px rgba(37, 211, 102, 0.6);
}

@keyframes float-wa {
    0% { transform: translateY(0); }
    100% { transform: translateY(-10px); }
}

/* Animations */
@keyframes float {
    0% { transform: translate(0, 0) rotate(0deg); }
    100% { transform: translate(30px, 30px) rotate(10deg); }
}

@keyframes spin {
    100% { transform: rotate(360deg); }
}

.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s var(--smooth), transform 0.8s var(--smooth);
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

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

/* Responsive Design */
@media (max-width: 1024px) {
    h1 { font-size: 3rem; }
    .hero-container { gap: 2rem; }
    .about-grid { grid-template-columns: repeat(2, 1fr); }
    .features-wrapper { padding: 3rem 2rem; }
    .why-list { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-list {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background: rgba(10, 10, 22, 0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        padding: 2rem 0;
        gap: 1.5rem;
        transform: translateY(-150%);
        transition: transform 0.4s var(--spring);
        border-bottom: 1px solid var(--glass-border);
    }

    .nav-list.active {
        transform: translateY(0);
    }

    .nav-actions { display: none; }
    .mobile-menu-btn { display: block; }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content {
        order: 1;
    }

    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-buttons {
        justify-content: center;
    }
    
    .hero-glass {
        width: 80%;
        margin: 0 auto;
    }
    
    .about-grid { grid-template-columns: 1fr; }
    .why-list { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    
    .features-wrapper { padding: 2rem 1.5rem; }
}