@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');

:root {
    --primary: #1e3a8a; /* deep blue */
    --primary-light: #3b82f6;
    --accent: #f59e0b; /* golden yellow */
    --bg-light: #f8fafc;
    --text-dark: #0f172a;
    --text-muted: #64748b;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --radius-lg: 16px;
    --radius-md: 12px;
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Outfit', sans-serif; background-color: var(--bg-light); color: var(--text-dark); line-height: 1.6; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
button { font-family: inherit; cursor: pointer; transition: var(--transition); border: none; outline: none; }

.navbar {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky; top: 0; z-index: 50;
    padding: 1rem 10%;
    display: flex; justify-content: space-between; align-items: center;
}
.navbar .brand { font-size: 1.5rem; font-weight: 700; color: var(--primary); letter-spacing: -0.5px; }
.navbar .nav-links { display: flex; gap: 2rem; align-items: center; }
.navbar .nav-links a:hover { color: var(--primary); }

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
}
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-light); transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-accent { background: var(--accent); color: white; }
.btn-accent:hover { filter: brightness(1.1); transform: translateY(-2px); box-shadow: var(--shadow-lg); }

/* Hero Section */
.hero {
    padding: 6rem 5%; text-align: center;
    background: linear-gradient(135deg, #f0f4f8 0%, #e0e7ff 100%);
    position: relative; overflow: hidden;
}
.hero::before {
    content: ''; position: absolute; width: 400px; height: 400px; background: var(--primary-light);
    border-radius: 50%; filter: blur(100px); opacity: 0.15; top: -100px; left: -100px;
}
.hero h1 { font-size: 3.5rem; font-weight: 700; margin-bottom: 1rem; color: var(--primary); letter-spacing: -1px; }
.hero p { font-size: 1.25rem; color: var(--text-muted); max-width: 600px; margin: 0 auto 2rem auto; }

/* Course Grid */
.container { max-width: 1600px; padding: 4rem 2rem; margin: 0 auto; }
.section-title { font-size: 2rem; font-weight: 700; margin-bottom: 2rem; color: var(--primary); }
.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem; }

@media (max-width: 1024px) {
    .grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
    .grid { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
}

/* Horizontal Carousel */
.carousel-container {
    display: flex;
    gap: 2rem;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding-bottom: 1.5rem;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-light) #f1f5f9;
}
.carousel-container::-webkit-scrollbar {
    height: 8px;
}
.carousel-container::-webkit-scrollbar-track {
    background: #f1f5f9;
    border-radius: 4px;
}
.carousel-container::-webkit-scrollbar-thumb {
    background: var(--primary-light);
    border-radius: 4px;
}
.carousel-container .course-card {
    flex: 0 0 calc(25% - 1.5rem);
    width: calc(25% - 1.5rem);
    scroll-snap-align: start;
}
@media (max-width: 1024px) {
    .carousel-container .course-card { 
        flex: 0 0 calc(33.333% - 1.33rem); 
        width: calc(33.333% - 1.33rem); 
    }
}
@media (max-width: 768px) {
    .carousel-container { gap: 1rem; }
    .carousel-container .course-card { 
        flex: 0 0 calc(50% - 0.5rem); 
        width: calc(50% - 0.5rem); 
    }
}

/* Course Card */
.course-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    display: flex; flex-direction: column;
}
.course-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}
.course-card img { width: 100%; aspect-ratio: 3/4; object-fit: cover; }
.course-content { padding: 1.5rem; flex-grow: 1; display: flex; flex-direction: column; }
.course-tag { display: inline-block; padding: 0.25rem 0.75rem; background: #e0e7ff; color: var(--primary); border-radius: 20px; font-size: 0.8rem; font-weight: 600; margin-bottom: 1rem; }
.course-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 0.5rem; color: var(--text-dark); }
.course-price { font-size: 1.5rem; font-weight: 700; color: var(--accent); margin-top: auto; padding-top: 1rem; }

/* Dashboard */
.dashboard-layout { display: flex; min-height: calc(100vh - 70px); }
.sidebar { width: 250px; background: white; border-right: 1px solid var(--border-color); padding: 2rem 0; }
.sidebar-link { display: block; padding: 1rem 2rem; color: var(--text-muted); font-weight: 500; }
.sidebar-link:hover, .sidebar-link.active { background: #f1f5f9; color: var(--primary); border-right: 3px solid var(--primary); }
.main-content { flex: 1; padding: 2rem 10%; }

/* Forms */
.form-group { margin-bottom: 1.5rem; }
.form-label { display: block; margin-bottom: 0.5rem; font-weight: 500; color: var(--text-dark); }
.form-control { width: 100%; padding: 0.75rem 1rem; border: 1px solid var(--border-color); border-radius: var(--radius-md); font-family: inherit; font-size: 1rem; transition: var(--transition); }
.form-control:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1); }

/* === MOBIL/TABLET DUZENI (2026-10-03 eklendi) ===
   Olculen sorunlar: ust menu 390px ekranda 535px yer kapliyor ve sayfayi
   629px'e itiyordu (yatay kaydirma); kurs sayfasindaki 2 kolonlu duzen
   mobilde de 2 kolon kaliyordu. */

/* Ust menu: dar ekranda tasmak yerine alt satira sarsin */
@media (max-width: 900px) {
    .navbar .nav-links {
        flex-wrap: wrap;
        justify-content: flex-end;
        gap: 0.75rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 600px) {
    .navbar .nav-links { gap: 0.5rem; font-size: 0.85rem; }
    .navbar .nav-links .btn { padding: 0.5rem 0.9rem; font-size: 0.85rem; }
}

/* Kurs sayfasi ust bolumu: dar ekranda tek kolon
   (sablonda inline style oldugu icin !important sart) */
@media (max-width: 900px) {
    .kurs-ust-grid {
        grid-template-columns: 1fr !important;
        gap: 2rem !important;
    }
}

/* Hicbir ogenin ekrani asmasini engelle */
@media (max-width: 900px) {
    .container { padding-left: 1rem; padding-right: 1rem; }
    img { max-width: 100%; height: auto; }
}