/* ===== ULUSOY DIGITAL PORTAL - MAIN STYLES ===== */
/* 2026 Vizyonu - Modern Eğitim Platformu */

:root {
    /* Teal/Yeşil Tonları */
    --primary-teal: #0d9488;
    --primary-teal-dark: #0f766e;
    --primary-teal-light: #14b8a6;
    --accent-green: #10b981;
    --accent-emerald: #059669;
    
    /* Neon Efektleri */
    --neon-teal: #2dd4bf;
    --neon-green: #34d399;
    --neon-glow: 0 0 20px rgba(45, 212, 191, 0.5);
    
    /* Koyu Arka Plan */
    --bg-dark: #0a0f1a;
    --bg-darker: #050810;
    --bg-card: rgba(15, 23, 42, 0.8);
    --bg-card-hover: rgba(20, 30, 50, 0.9);
    
    /* Metin Renkleri */
    --text-white: #f8fafc;
    --text-gray: #94a3b8;
    --text-muted: #64748b;
    
    /* Gradyanlar */
    --gradient-primary: linear-gradient(135deg, #0d9488 0%, #10b981 100%);
    --gradient-dark: linear-gradient(180deg, #0a0f1a 0%, #050810 100%);
    --gradient-card: linear-gradient(145deg, rgba(15, 23, 42, 0.9) 0%, rgba(10, 15, 26, 0.95) 100%);
    
    /* Diğer */
    --border-color: rgba(45, 212, 191, 0.2);
    --shadow-lg: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

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

/* ===== ANIMATED CODE BACKGROUND ===== */
.code-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    background: var(--gradient-dark);
}

.code-rain {
    position: absolute;
    top: -100%;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 14px;
    color: var(--neon-teal);
    opacity: 0.15;
    animation: codeRain linear infinite;
    white-space: nowrap;
    text-shadow: 0 0 10px var(--neon-teal);
}

@keyframes codeRain {
    0% {
        transform: translateY(-100%);
        opacity: 0;
    }
    10% {
        opacity: 0.15;
    }
    90% {
        opacity: 0.15;
    }
    100% {
        transform: translateY(100vh);
        opacity: 0;
    }
}

/* Floating Particles */
.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--neon-teal);
    border-radius: 50%;
    animation: float 15s infinite ease-in-out;
    box-shadow: 0 0 10px var(--neon-teal);
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) translateX(0);
        opacity: 0.3;
    }
    25% {
        transform: translateY(-100px) translateX(50px);
        opacity: 0.8;
    }
    50% {
        transform: translateY(-50px) translateX(-30px);
        opacity: 0.5;
    }
    75% {
        transform: translateY(-150px) translateX(20px);
        opacity: 0.7;
    }
}

/* ===== NAVIGATION ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 2rem;
    background: rgba(10, 15, 26, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.navbar.scrolled {
    padding: 0.75rem 2rem;
    background: rgba(10, 15, 26, 0.95);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.logo-icon {
    width: 45px;
    height: 45px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.2rem;
    color: white;
    box-shadow: var(--neon-glow);
}

.logo-text {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-white);
}

.logo-text span {
    color: var(--neon-teal);
}

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

.nav-links a {
    color: var(--text-gray);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding: 0.5rem 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--neon-teal);
}

.nav-links a:hover::after {
    width: 100%;
}

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

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(13, 148, 136, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(13, 148, 136, 0.5);
}

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

.btn-secondary:hover {
    border-color: var(--neon-teal);
    color: var(--neon-teal);
    box-shadow: var(--neon-glow);
}

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    border-radius: 12px;
}

.btn-glow {
    animation: btnGlow 2s ease-in-out infinite;
}

@keyframes btnGlow {
    0%, 100% {
        box-shadow: 0 4px 15px rgba(13, 148, 136, 0.4);
    }
    50% {
        box-shadow: 0 4px 30px rgba(13, 148, 136, 0.7), var(--neon-glow);
    }
}

/* ===== HERO SECTION ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8rem 2rem 4rem;
    position: relative;
}

.hero-content {
    max-width: 900px;
    text-align: center;
    z-index: 10;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(45, 212, 191, 0.1);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 0.9rem;
    color: var(--neon-teal);
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease-out;
}

.hero-badge .pulse {
    width: 8px;
    height: 8px;
    background: var(--neon-green);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(1.5);
    }
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero h1 .highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero h1 .glow-text {
    text-shadow: 0 0 30px rgba(45, 212, 191, 0.5);
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-gray);
    max-width: 700px;
    margin: 0 auto 2.5rem;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 4rem;
    margin-top: 4rem;
    animation: fadeInUp 0.8s ease-out 0.8s both;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--neon-teal);
    display: block;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

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

/* ===== SECTIONS ===== */
.section {
    padding: 6rem 2rem;
    position: relative;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 4rem;
}

.section-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: rgba(45, 212, 191, 0.1);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--neon-teal);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
}

.section-description {
    font-size: 1.1rem;
    color: var(--text-gray);
}

/* ===== COURSE CARDS ===== */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.course-card {
    background: var(--gradient-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: var(--transition);
}

.course-card:hover {
    transform: translateY(-10px);
    border-color: var(--neon-teal);
    box-shadow: var(--shadow-lg), var(--neon-glow);
}

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

.course-icon {
    width: 70px;
    height: 70px;
    background: rgba(45, 212, 191, 0.1);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

.course-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.course-card p {
    color: var(--text-gray);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.course-features {
    list-style: none;
    margin-bottom: 2rem;
}

.course-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0;
    color: var(--text-gray);
    font-size: 0.95rem;
}

.course-features li::before {
    content: '✓';
    color: var(--neon-green);
    font-weight: 700;
}

.course-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.course-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--neon-teal);
}

.course-price span {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 400;
}

/* ===== FEATURES SECTION ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    transition: var(--transition);
}

.feature-card:hover {
    border-color: var(--neon-teal);
    transform: translateY(-5px);
}

.feature-icon {
    width: 50px;
    height: 50px;
    background: rgba(45, 212, 191, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.feature-card h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* ===== PRICING SECTION ===== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--gradient-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 2.5rem;
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.pricing-card.featured {
    border-color: var(--neon-teal);
    transform: scale(1.05);
}

.pricing-card.featured::before {
    content: 'EN POPÜLER';
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    padding: 0.4rem 1.5rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1px;
}

.pricing-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-10px);
}

.pricing-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.pricing-price {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--neon-teal);
    margin: 1rem 0;
}

.pricing-price span {
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: 400;
}

.pricing-features {
    list-style: none;
    margin: 2rem 0;
    text-align: left;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-gray);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-features li .check {
    color: var(--neon-green);
    font-weight: 700;
}

.pricing-features li .cross {
    color: var(--text-muted);
}

/* ===== TESTIMONIALS ===== */
.testimonials-slider {
    max-width: 800px;
    margin: 0 auto;
}

.testimonial-card {
    background: var(--gradient-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2.5rem;
    text-align: center;
}

.testimonial-text {
    font-size: 1.25rem;
    font-style: italic;
    color: var(--text-gray);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.testimonial-author {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.testimonial-avatar {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
}

.testimonial-info h5 {
    font-size: 1.1rem;
    font-weight: 600;
}

.testimonial-info p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* ===== CTA SECTION ===== */
.cta-section {
    background: var(--gradient-card);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    text-align: center;
    padding: 5rem 2rem;
}

.cta-section h2 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 1rem;
}

.cta-section p {
    font-size: 1.1rem;
    color: var(--text-gray);
    max-width: 600px;
    margin: 0 auto 2rem;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--bg-darker);
    padding: 4rem 2rem 2rem;
    border-top: 1px solid var(--border-color);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 3rem;
    max-width: 1200px;
    margin: 0 auto 3rem;
}

.footer-brand p {
    color: var(--text-muted);
    margin-top: 1rem;
    max-width: 300px;
    line-height: 1.7;
}

.footer-column h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-white);
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: 0.75rem;
}

.footer-column ul a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}

.footer-column ul a:hover {
    color: var(--neon-teal);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ===== MOBILE MENU ===== */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 2px;
    background: var(--text-white);
    transition: var(--transition);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links,
    .nav-buttons {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 2rem;
    }
    
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-card.featured {
        transform: none;
    }
    
    .pricing-card.featured:hover {
        transform: translateY(-10px);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-brand p {
        margin: 1rem auto;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .btn-large {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
    }
}

/* ===== UTILITY CLASSES ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

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

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

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }