:root {
    --bg-dark: #0D0D0D;
    --bg-card: #161616;
    --text-main: #F8FAFC;
    --text-silver: #A0A0A0;
    --border-silver: rgba(160, 160, 160, 0.15);
    --font-main: 'Outfit', sans-serif;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Global Container */
.container {
    max-width: 1300px; /* Biraz daha geniş ve ferah */
    margin: 0 auto;
    padding: 0 4rem; /* Yanlardan daha dengeli boşluk */
}

/* Navbar Optimization */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    padding: 1.5rem 6rem; /* Köşelerden biraz daha içeri çekildi */
    background: rgba(13, 13, 13, 0.95);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid var(--border-silver);
}

.nav-right {
    margin-left: auto; /* Tüm içeriği en sağa iter */
    display: flex;
    align-items: center;
    gap: 3.5rem;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-link {
    text-decoration: none;
    color: #FFFFFF; /* Pure White */
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--text-silver);
}

.logo {
    font-weight: 800;
    letter-spacing: 2px;
    text-decoration: none;
    color: var(--text-main);
    font-size: 1.5rem;
    transition: var(--transition);
}

/* Professional Grid (3 Columns) */
.catalog-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr); /* Daha ferah 3'lü dizilim */
    gap: 2.5rem;
}

/* Matte Marketplace Card */
.course-card {
    background: #151515; /* Professional Matte Anthracite */
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    display: flex;
    flex-direction: column;
    position: relative;
}

.course-card:hover {
    transform: translateY(-10px);
    background: #222;
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.05); /* Subtle white glow */
}

.course-badge {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: #FFFFFF;
    color: #000000;
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 800;
    text-transform: uppercase;
    z-index: 10;
}

.course-thumb {
    width: 100%;
    height: 140px;
    overflow: hidden;
    position: relative;
}

.course-thumb::after {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.2); /* Subtle overlay */
}

.course-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.course-content {
    padding: 1.2rem 1.2rem 2.5rem 1.2rem; /* Bottom padding increased for breathing room */
    flex-grow: 1;
}

.rating {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0.5rem 0 1rem 0;
    color: #FFC107; /* Vivid Gold Stars */
    font-size: 0.8rem;
}

.rating i {
    text-shadow: 0 0 10px rgba(255, 193, 7, 0.3); /* Subtle star glow */
}

.rating span {
    color: var(--text-silver);
    font-size: 0.75rem;
}

.price-container {
    display: flex;
    align-items: baseline;
    gap: 0.8rem;
}

.price-new {
    font-size: 1.1rem;
    font-weight: 800;
    color: #FFFFFF;
}

.price-old {
    font-size: 0.9rem;
    color: var(--text-silver);
    text-decoration: line-through;
    opacity: 0.6;
}

/* Pill Filters */
.category-pill {
    padding: 0.6rem 1.5rem;
    border-radius: 50px;
    border: 1px solid var(--border-silver);
    color: #FFFFFF;
    text-decoration: none;
    font-size: 0.85rem;
    transition: var(--transition);
}

.category-pill.active {
    background: var(--text-silver);
    color: #000000;
    border-color: var(--text-silver);
}

/* Button Refinement */
.btn-primary:hover {
    background: #FFFFFF;
    color: #000000;
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.2); /* White button glow */
}

/* Sections */
section {
    padding: 8rem 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 4rem;
}

/* Buttons */
.btn {
    padding: 0.8rem 1.8rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.85rem;
    transition: var(--transition);
    display: inline-block;
    cursor: pointer;
    border: 1px solid transparent;
}

.btn-primary {
    background: #FFFFFF;
    color: #000000;
    border: 1px solid #FFFFFF;
}

.btn-primary:hover {
    background: #E2E8F0;
    transform: translateY(-2px);
}

.btn-outline {
    border: 1px solid var(--border-silver);
    color: #FFFFFF;
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
}

/* Hero Section (PC Left Aligned) */
.hero {
    padding: 14rem 0 10rem 0;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr; /* Tam simetri */
    gap: 8rem; /* Geniş boşluk korunuyor */
    align-items: center;
}

.hero-content {
    text-align: left;
}

.hero-content h1 {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 2rem;
    color: #FFFFFF;
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-silver);
    margin-bottom: 3.5rem;
    max-width: 550px;
}

.hero-visual img {
    width: 100%;
    border-radius: 24px;
    border: 1px solid var(--border-silver);
    box-shadow: 0 40px 80px rgba(0,0,0,0.5);
}

/* Glassmorphism Skill Tree */
.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
}

.glass-card {
    background: rgba(22, 22, 22, 0.4);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 3rem;
    transition: var(--transition);
}

.glass-card:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-8px);
}

/* Catalog Grid */
.catalog-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
}

/* Info Section (News & Calendar) */
.info-section {
    padding: 8rem 0;
    background: #0D0D0D;
}

.info-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 5rem;
}

/* Stats Counter Bar */
.stats-counter {
    padding: 4rem 0;
    border-top: 1px solid var(--border-silver);
    background: #090909;
}

.stats-grid {
    display: flex;
    justify-content: center;
    gap: 8rem;
    text-align: center;
}

.stat-val {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-main);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-silver);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.course-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.course-price {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-main);
}

.btn-sm {
    padding: 0.5rem 1.2rem;
    font-size: 0.8rem;
}

/* News & Calendar Grid */
.news-calendar-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.news-item {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

.news-item:hover {
    transform: translateX(10px);
}

.news-thumb {
    width: 80px;
    height: 80px;
    background: #222;
    border-radius: 12px;
    border: 1px solid var(--border-silver);
    flex-shrink: 0;
}

/* Mobile Adjustments */
@media (max-width: 992px) {
    .news-calendar-grid { grid-template-columns: 1fr; }
}

/* Instructors */
.instructor-mini {
    display: flex;
    justify-content: center;
    gap: 4rem;
    flex-wrap: wrap;
}

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

.inst-card img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    filter: grayscale(1);
    margin-bottom: 1rem;
}

.inst-card h5 {
    font-size: 0.9rem;
}

/* Social Proof Marquee */
.social-proof-ribbon {
    background: #121212;
    border-top: 1px solid var(--border-silver);
    border-bottom: 1px solid var(--border-silver);
    padding: 1rem 0;
    overflow: hidden;
    white-space: nowrap;
    position: relative;
}

.marquee-content {
    display: inline-block;
    animation: marquee 40s linear infinite;
}

.marquee-item {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    margin-right: 4rem;
    color: var(--text-silver);
    font-size: 0.9rem;
}

.marquee-item i {
    color: var(--text-main);
    font-size: 0.6rem;
}

@keyframes marquee {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* Info Grid (Calendar & Blog) */
.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
}

.calendar-item {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-silver);
}

.calendar-date {
    background: rgba(255, 255, 255, 0.05);
    padding: 1rem;
    border-radius: 12px;
    min-width: 80px;
    text-align: center;
}

.calendar-date span {
    display: block;
    font-size: 1.3rem;
    font-weight: 800;
}

.calendar-date small {
    text-transform: uppercase;
    font-size: 0.7rem;
    color: var(--text-silver);
}

.news-card {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

.news-card:hover {
    transform: translateX(10px);
}

.news-card img {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border-radius: 12px;
    border: 1px solid var(--border-silver);
}

.news-card h4 {
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.news-card p {
    font-size: 0.85rem;
    color: var(--text-silver);
}

/* Roadmap Icon */
.roadmap-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    opacity: 0.8;
}

/* Footer Refinement */
footer {
    padding: 6rem 0 3rem 0;
    border-top: 1px solid var(--border-silver);
    background: #090909;
}

/* Responsive Design */

/* Tablet & Smaller Laptops */
@media (max-width: 1024px) {
    .container { padding: 0 3rem; }
    .hero-grid { gap: 3rem; }
    .hero-content h1 { font-size: 3.5rem; }
    .stats-grid { gap: 4rem; }
}

@media (max-width: 992px) {
    .hero-grid { 
        grid-template-columns: 1fr; 
        text-align: center; 
        gap: 4rem; 
    }
    
    .hero-content p { margin: 0 auto 3rem auto; }
    .hero-visual { order: -1; } /* Image on top for mobile */
    
    .catalog-grid, .card-grid { grid-template-columns: repeat(2, 1fr); }
    .info-grid { grid-template-columns: 1fr; gap: 4rem; }
    .stats-grid { flex-wrap: wrap; gap: 3rem; }
}

/* Mobile Devices */
@media (max-width: 768px) {
    .navbar { padding: 1rem 2rem; }
    .hamburger { display: flex; }
    
    .nav-right {
        display: none;
        position: fixed;
        top: 0; left: 0;
        width: 100%; height: 100vh;
        background: var(--bg-dark);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 3rem;
        z-index: 999;
    }

    .nav-right.active { display: flex; }
    .nav-links { flex-direction: column; gap: 2.5rem; }
    .auth-btns { flex-direction: column; width: 80%; }
    .auth-btns .btn { width: 100%; text-align: center; }

    .hero-content { 
        text-align: center; /* Centered for mobile */
    }

    .hero-content h1 { font-size: 2.5rem; }
    .hero-content p { margin: 0 auto 2.5rem auto; }
    
    .section-title { font-size: 2rem; }
    
    .catalog-grid, .card-grid { grid-template-columns: 1fr; }
    .stats-grid { flex-direction: column; gap: 3rem; }
    .info-grid { grid-template-columns: 1fr; }
}

.course-img {
    height: 180px;
    background: #222;
    position: relative;
    overflow: hidden;
    border-top-left-radius: 12px;
    border-top-right-radius: 12px;
}