/**
 * style.css
 * Global layout, sidebar, header ve temel stiller
 * Glassmorphism tasarım sistemi ile uyumlu
 */

/* ========== GLOBAL RESET & BASE ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

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

a:hover {
    color: var(--accent-purple);
}

button {
    border: none;
    cursor: pointer;
    font-family: inherit;
    background: transparent;
}

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

ul,
ol {
    list-style: none;
}

/* ========== SIDEBAR ========== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 280px;
    height: 100vh;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-right: 1px solid var(--glass-border);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    z-index: var(--z-sticky);
    transition: transform var(--transition-normal);
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--glass-border);
    margin-bottom: var(--spacing-xl);
}

.sidebar-logo {
    width: 48px;
    height: 48px;
    background: var(--gradient-purple-cyan);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--text-primary);
    box-shadow: var(--shadow-glow-purple);
}

.sidebar-title {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--gradient-purple-cyan);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* User Profile in Sidebar */
.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xl);
    transition: all var(--transition-fast);
}

.user-profile:hover {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-hover);
}

.user-avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: var(--gradient-purple-pink);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--text-primary);
    overflow: hidden;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-info h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.user-info p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Sidebar Navigation */
.sidebar-nav {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.nav-item:hover {
    background: var(--glass-bg-hover);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--accent-purple-glow);
    color: var(--accent-purple);
    border: 1px solid rgba(124, 74, 255, 0.3);
}

.nav-item i {
    width: 20px;
    font-size: 1.1rem;
    text-align: center;
}

.nav-item span {
    font-size: 0.95rem;
}

/* Sign Out Button */
.sign-out-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 500;
    margin-top: var(--spacing-xl);
    transition: all var(--transition-fast);
}

.sign-out-btn:hover {
    background: var(--danger-bg);
    border-color: var(--danger);
    color: var(--danger);
}

/* ========== HEADER ========== */
.header {
    position: fixed;
    top: 0;
    left: 280px;
    right: 0;
    height: 72px;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-2xl);
    z-index: var(--z-sticky);
}

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

.logo i {
    font-size: 1.75rem;
    background: var(--gradient-purple-cyan);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

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

/* Search Box */
.search-box {
    position: relative;
    width: 320px;
}

.search-box i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.95rem;
}

.search-box input {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    padding: var(--spacing-sm) var(--spacing-lg);
    padding-left: 44px;
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent-purple);
    box-shadow: 0 0 0 3px var(--accent-purple-glow);
}

/* Notification Button */
.notification-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

.notification-btn:hover {
    background: var(--glass-bg-hover);
    color: var(--text-primary);
    border-color: var(--glass-border-hover);
}

.notification-btn .badge {
    position: absolute;
    top: -4px;
    right: -4px;
    width: 18px;
    height: 18px;
    background: var(--danger);
    color: var(--text-primary);
    font-size: 0.7rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--gradient-purple-pink);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    cursor: pointer;
    overflow: hidden;
    transition: box-shadow var(--transition-fast);
}

.header-avatar:hover {
    box-shadow: var(--shadow-glow-purple);
}

.header-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ========== MAIN CONTENT ========== */
.main-content {
    margin-left: 280px;
    margin-top: 72px;
    padding: var(--spacing-2xl);
    min-height: calc(100vh - 72px);
}

.main-content-full {
    margin-left: 0;
    margin-top: 72px;
    padding: var(--spacing-2xl);
    min-height: calc(100vh - 72px);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

/* ========== COURSES SECTION ========== */
.courses-section {
    padding: var(--spacing-2xl);
    animation: private-fadeIn var(--transition-normal) ease-out;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

/* Primary Button */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--gradient-purple-cyan);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    box-shadow: var(--shadow-glow-purple);
    transition: all var(--transition-normal);
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px rgba(124, 74, 255, 0.5);
}

/* ========== COURSES GRID ========== */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

/* Course Card */
.course-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.course-card:hover {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.course-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
    background: var(--gradient-purple-cyan);
    position: relative;
}

.course-image::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60%;
    background: linear-gradient(to top, var(--bg-primary), transparent);
}

.course-content {
    padding: var(--spacing-lg);
}

.course-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
}

.course-code {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.course-title {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.course-menu-btn {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.course-menu-btn:hover {
    background: var(--glass-bg-hover);
    color: var(--text-primary);
}

.course-notebooks {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.course-notebooks i {
    color: var(--accent-purple);
}

.course-link {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--gradient-purple-cyan);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    width: 100%;
    transition: all var(--transition-normal);
}

.course-link:hover {
    box-shadow: var(--shadow-glow-purple);
    transform: translateY(-1px);
}

/* Course Badge */
.course-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.7rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.course-badge.new {
    background: var(--accent-cyan-glow);
    color: var(--accent-cyan);
}

.course-badge.popular {
    background: var(--accent-pink-glow);
    color: var(--accent-pink);
}

/* ========== MOBILE HAMBURGER ========== */
.hamburger-btn {
    display: none;
    width: 40px;
    height: 40px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    font-size: 1.25rem;
}

/* Mobile Overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: calc(var(--z-sticky) - 1);
}

.sidebar-overlay.active {
    display: block;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1200px) {
    .courses-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

@media (max-width: 992px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .header {
        left: 0;
        padding: 0 var(--spacing-lg);
    }

    .main-content {
        margin-left: 0;
        padding: var(--spacing-lg);
    }

    .hamburger-btn {
        display: flex;
    }

    .courses-section {
        padding: var(--spacing-lg);
    }
}

@media (max-width: 768px) {
    .header {
        height: 64px;
    }

    .main-content {
        margin-top: 64px;
        padding: var(--spacing-md);
    }

    .search-box {
        display: none;
    }

    .section-header h2 {
        font-size: 1.5rem;
    }

    .courses-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .courses-section {
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .header {
        padding: 0 var(--spacing-md);
    }

    .logo h1 {
        display: none;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    .btn-primary {
        width: 100%;
    }

    .course-content {
        padding: var(--spacing-md);
    }
}

/* ========== BACK BUTTON ========== */
.back-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    margin-bottom: var(--spacing-lg);
}

.back-btn:hover {
    background: var(--glass-bg-hover);
    border-color: var(--glass-border-hover);
    color: var(--text-primary);
}

/* ========== PAGE TITLE ========== */
.page-title {
    font-size: 2rem;
    font-weight: 700;
    background: var(--gradient-purple-cyan);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.page-subtitle {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-2xl);
}

/* ========== EMPTY STATE ========== */
.empty-state {
    text-align: center;
    padding: var(--spacing-3xl);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
}

.empty-state i {
    font-size: 4rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
}

.empty-state h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.empty-state p {
    color: var(--text-muted);
    margin-bottom: var(--spacing-xl);
}

/* ========== ANIMATIONS ========== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translate3d(0, 30px, 0);
    }

    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

@keyframes scaleUp {
    from {
        opacity: 0;
        transform: scale3d(0.92, 0.92, 1);
    }

    to {
        opacity: 1;
        transform: scale3d(1, 1, 1);
    }
}

.course-card,
.stat-card {
    animation: fadeInUp 0.5s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.course-card:nth-child(1),
.stat-card:nth-child(1) {
    animation-delay: 0.05s;
}

.course-card:nth-child(2),
.stat-card:nth-child(2) {
    animation-delay: 0.1s;
}

.course-card:nth-child(3),
.stat-card:nth-child(3) {
    animation-delay: 0.15s;
}

.course-card:nth-child(4),
.stat-card:nth-child(4) {
    animation-delay: 0.2s;
}

.course-card:nth-child(5) {
    animation-delay: 0.25s;
}

.course-card:nth-child(6) {
    animation-delay: 0.3s;
}

.course-card:nth-child(7) {
    animation-delay: 0.35s;
}

.course-card:nth-child(8) {
    animation-delay: 0.4s;
}

/* ========== SELECTION ========== */
::selection {
    background: var(--accent-purple-glow);
    color: var(--text-primary);
}

/* ========== FOCUS VISIBLE ========== */
:focus-visible {
    outline: 2px solid var(--accent-purple);
    outline-offset: 2px;
}

/* ========== REDUCED MOTION ========== */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}