/* ========================================
   CSS Variables - Tema Renkleri
   ======================================== */
:root {
    --bg: #FAFAF9;
    --surface: #FFFFFF;
    --surface-2: #F5F5F4;
    --ink: #17150F;
    --ink-2: #44403C;
    --muted: #78716C;
    --border: #E7E5E4;
    --border-2: #D6D3D1;

    --accent: #0E5C4F;
    --accent-light: #E0F2EA;
    --accent-dark: #0A4A3F;

    --secondary: #C4501E;
    --secondary-light: #F7E7DE;

    --success: #16A34A;
    --warning: #F59E0B;
    --error: #DC2626;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1);

    /* Eski degiskenlerle uyumluluk */
    --bg-primary: var(--surface);
    --bg-secondary: var(--surface-2);
    --bg-card: var(--surface);
    --bg-hover: var(--surface-2);
    --text-primary: var(--ink);
    --text-secondary: var(--ink-2);
    --text-muted: var(--muted);
    --accent-hover: var(--accent-dark);

    --gradient-primary: linear-gradient(135deg, #0E5C4F 0%, #1A8A75 50%, #34D399 100%);
    --gradient-hero: linear-gradient(135deg, #0E5C4F 0%, #0A4A3F 100%);

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Karanlik Tema */
[data-theme="dark"] {
    --bg: #0C0A09;
    --surface: #1C1917;
    --surface-2: #292524;
    --ink: #FAFAF9;
    --ink-2: #D6D3D1;
    --muted: #A8A29E;
    --border: #44403C;
    --border-2: #57534E;

    --accent: #34D399;
    --accent-light: #064E3B;
    --accent-dark: #6EE7B7;

    --secondary: #FB923C;
    --secondary-light: #431407;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.5);

    --bg-primary: var(--surface);
    --bg-secondary: var(--surface-2);
    --bg-card: var(--surface);
    --bg-hover: var(--surface-2);
    --text-primary: var(--ink);
    --text-secondary: var(--ink-2);
    --text-muted: var(--muted);
    --accent-hover: var(--accent-dark);

    --gradient-primary: linear-gradient(135deg, #34D399 0%, #6EE7B7 50%, #A7F3D0 100%);
    --gradient-hero: linear-gradient(135deg, #34D399 0%, #064E3B 100%);
}

/* ========================================
   Sifirlama ve Temel Ayarlar
   ======================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg);
    color: var(--ink);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-feature-settings: "cv02", "cv03", "cv04", "cv11";
}

/* Selection rengi */
::selection {
    background: var(--accent);
    color: #FFFFFF;
}

::-moz-selection {
    background: var(--accent);
    color: #FFFFFF;
}

/* Scrollbar ozellestirme */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface-2);
}

::-webkit-scrollbar-thumb {
    background: var(--border-2);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--muted);
}

/* Firefox scrollbar */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--border-2) var(--surface-2);
}

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

img {
    max-width: 100%;
    display: block;
}

/* ========================================
   Focus Visible Stillleri
   ======================================== */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

:focus:not(:focus-visible) {
    outline: none;
}

/* ========================================
   Container & Layout
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 2.25rem;
    font-weight: 400;
    color: var(--ink);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.section-description {
    font-size: 1.1rem;
    color: var(--ink-2);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   Heading Stilleri
   ======================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Instrument Serif', Georgia, serif;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

/* ========================================
   Header
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: background 0.3s ease, border-color 0.3s ease;
}

[data-theme="dark"] .header {
    background: rgba(12, 10, 9, 0.8);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--ink);
}

.logo span {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 1.25rem;
    font-weight: 400;
}

.logo-svg {
    flex-shrink: 0;
}

.logo-icon {
    font-size: 1.75rem;
}

.nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--ink-2);
    white-space: nowrap;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--ink);
    background: var(--surface-2);
}

.nav-link.active {
    color: var(--accent);
    background: var(--accent-light);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Tema Toggle Butonu */
.theme-toggle {
    position: relative;
    width: 48px;
    height: 28px;
    border-radius: 14px;
    border: 2px solid var(--border);
    background: var(--surface-2);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    padding: 0 4px;
}

.theme-toggle:hover {
    border-color: var(--accent);
}

.theme-icon {
    font-size: 14px;
    transition: var(--transition);
    position: absolute;
}

.theme-icon.sun {
    left: 6px;
    opacity: 1;
    transform: scale(1);
}

.theme-icon.moon {
    right: 6px;
    opacity: 0.5;
    transform: scale(0.8);
}

[data-theme="dark"] .theme-icon.sun {
    opacity: 0.5;
    transform: scale(0.8);
}

[data-theme="dark"] .theme-icon.moon {
    opacity: 1;
    transform: scale(1);
}

/* Mobil Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--ink);
    border-radius: 2px;
    transition: var(--transition);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobil Nav */
.mobile-nav {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 16px 20px;
    z-index: 999;
    flex-direction: column;
    gap: 4px;
    box-shadow: var(--shadow-lg);
}

.mobile-nav.active {
    display: flex;
}

.mobile-nav-link {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    color: var(--ink-2);
    transition: var(--transition);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    color: var(--accent);
    background: var(--accent-light);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    padding: 160px 0 100px;
    background: var(--surface);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: var(--gradient-primary);
    border-radius: 50%;
    opacity: 0.08;
    filter: blur(60px);
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, var(--secondary) 0%, var(--warning) 100%);
    border-radius: 50%;
    opacity: 0.06;
    filter: blur(60px);
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 50px;
    background: var(--accent-light);
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 24px;
    border: 1px solid var(--accent);
}

.hero-title {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 3.5rem;
    font-weight: 400;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
    color: var(--ink);
}

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

.hero-description {
    font-size: 1.2rem;
    color: var(--ink-2);
    max-width: 640px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 2.5rem;
    font-weight: 400;
    color: var(--accent);
    line-height: 1;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--muted);
    margin-top: 4px;
    font-weight: 500;
}

/* ========================================
   Butonlar
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent;
    gap: 8px;
    font-family: 'Plus Jakarta Sans', sans-serif;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(14, 92, 79, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 25px rgba(14, 92, 79, 0.4);
}

.btn-primary:active {
    transform: translateY(0) scale(1);
}

.btn-outline {
    background: transparent;
    color: var(--ink);
    border-color: var(--border);
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-light);
    transform: scale(1.02);
}

.btn-outline:active {
    transform: scale(1);
}

/* ========================================
   Kart Tasarimi - Dersler
   ======================================== */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.course-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.course-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--accent);
}

.course-card:hover::before {
    opacity: 1;
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
    display: inline-block;
    transition: transform 0.3s ease;
}

.course-card:hover .card-icon {
    transform: scale(1.15);
}

.card-title {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 1.2rem;
    font-weight: 400;
    color: var(--ink);
    margin-bottom: 8px;
}

.card-description {
    font-size: 0.9rem;
    color: var(--ink-2);
    margin-bottom: 20px;
    line-height: 1.5;
}

.card-meta {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--muted);
    font-weight: 500;
}

.meta-icon {
    font-size: 0.9rem;
}

.card-link {
    display: inline-flex;
    align-items: center;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent);
    transition: var(--transition);
}

.card-link:hover {
    color: var(--accent-dark);
    gap: 8px;
}

/* ========================================
   Ozellikler Bolumu
   ======================================== */
.features-section {
    background: var(--surface);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.feature-card {
    text-align: center;
    padding: 40px 30px;
    border-radius: var(--radius-lg);
    background: var(--surface-2);
    border: 1px solid var(--border);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    display: inline-block;
}

.feature-title {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 1.2rem;
    font-weight: 400;
    color: var(--ink);
    margin-bottom: 10px;
}

.feature-description {
    font-size: 0.95rem;
    color: var(--ink-2);
    line-height: 1.6;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 60px 0 0;
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-description {
    font-size: 0.9rem;
    color: var(--ink-2);
    line-height: 1.6;
    max-width: 320px;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-heading {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 1rem;
    font-weight: 400;
    color: var(--ink);
    margin-bottom: 4px;
}

.footer-links a {
    font-size: 0.9rem;
    color: var(--ink-2);
}

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

.footer-bottom {
    text-align: center;
    padding: 20px 0;
    border-top: 1px solid var(--border);
    font-size: 0.85rem;
    color: var(--muted);
}

/* ========================================
   Animasyonlar
   ======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.course-card {
    animation: fadeInUp 0.5s ease-out both;
}

.course-card:nth-child(1) { animation-delay: 0.05s; }
.course-card:nth-child(2) { animation-delay: 0.1s; }
.course-card:nth-child(3) { animation-delay: 0.15s; }
.course-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; }
.course-card:nth-child(9) { animation-delay: 0.45s; }
.course-card:nth-child(10) { animation-delay: 0.5s; }

/* Scroll reveal animasyonu */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* ========================================
   Auth Buttons (Login/Register)
   ======================================== */
.auth-buttons {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-login {
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--ink);
    background: transparent;
    border: 1.5px solid var(--border);
    cursor: pointer;
    transition: var(--transition);
}

.btn-login:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-light);
}

.btn-register {
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-weight: 600;
    color: #fff;
    background: var(--gradient-primary);
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-register:hover {
    transform: translateY(-1px) scale(1.02);
    box-shadow: 0 4px 12px rgba(14, 92, 79, 0.3);
}

.user-menu {
    display: none;
    align-items: center;
    gap: 12px;
}

.user-menu .user-name {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--ink);
}

.user-menu .btn-admin {
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--accent);
    background: var(--accent-light);
    border: 1px solid var(--accent);
    cursor: pointer;
    transition: var(--transition);
}

.user-menu .btn-admin:hover {
    background: var(--accent);
    color: #fff;
}

.user-menu .btn-logout {
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--muted);
    background: var(--surface-2);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: var(--transition);
}

.user-menu .btn-logout:hover {
    color: var(--error);
    border-color: var(--error);
}

/* ========================================
   Cookie Banner
   ======================================== */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 10000;
    background: var(--surface);
    border-top: 1px solid var(--border);
    box-shadow: 0 -4px 20px rgba(0,0,0,0.1);
    transform: translateY(100%);
    transition: transform 0.4s ease;
    padding: 20px 24px;
}

.cookie-banner.show {
    transform: translateY(0);
}

.cookie-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
}

.cookie-text h4 {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 1rem;
    font-weight: 400;
    margin-bottom: 4px;
}

.cookie-text p {
    font-size: 0.88rem;
    color: var(--ink-2);
}

.cookie-actions {
    display: flex;
    gap: 10px;
    flex-shrink: 0;
}

.cookie-btn {
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.cookie-accept {
    background: var(--gradient-primary);
    color: #fff;
}

.cookie-accept:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(14, 92, 79, 0.3);
}

.cookie-settings {
    background: var(--surface-2);
    color: var(--ink-2);
    border: 1px solid var(--border);
}

.cookie-settings:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* ========================================
   Ad Containers
   ======================================== */
.ad-container {
    margin: 20px 0;
    text-align: center;
}

.ad-placeholder {
    background: var(--surface-2);
    border: 1px dashed var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
    position: relative;
}

.ad-label {
    position: absolute;
    top: 4px;
    left: 8px;
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.ad-demo {
    padding: 20px;
    color: var(--muted);
    font-size: 0.85rem;
}

.ad-horizontal {
    max-width: 728px;
    margin: 20px auto;
}

.ad-vertical {
    max-width: 300px;
    margin: 20px auto;
}

/* ========================================
   Content Lock Overlay
   ======================================== */
.content-locked {
    position: relative;
    overflow: hidden;
}

.content-locked .lock-overlay {
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

[data-theme="dark"] .content-locked .lock-overlay {
    background: rgba(12, 10, 9, 0.85);
}

.lock-content {
    text-align: center;
    padding: 24px;
}

.lock-icon {
    width: 40px;
    height: 40px;
    color: var(--accent);
    margin-bottom: 12px;
}

.lock-text {
    font-size: 0.9rem;
    color: var(--ink-2);
    margin-bottom: 16px;
}

.btn-premium {
    padding: 10px 24px;
    background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-premium:hover {
    transform: translateY(-1px) scale(1.02);
    box-shadow: 0 4px 12px rgba(196, 80, 30, 0.3);
}

/* ========================================
   Premium Badge
   ======================================== */
.premium-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
    color: #fff;
    border-radius: 9999px;
    font-size: 0.72rem;
    font-weight: 700;
}

/* ========================================
   Subscription Card
   ======================================== */
.subscription-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
}

.sub-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.sub-header h3 {
    font-family: 'Instrument Serif', Georgia, serif;
    font-size: 1.1rem;
    font-weight: 400;
}

.btn-upgrade {
    padding: 8px 20px;
    background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-upgrade:hover {
    transform: translateY(-1px) scale(1.02);
    box-shadow: 0 4px 12px rgba(196, 80, 30, 0.3);
}

.sub-features {
    list-style: none;
}

.sub-features li {
    padding: 6px 0;
    font-size: 0.9rem;
    color: var(--ink-2);
}

.sub-features li::before {
    content: '';
}

/* ========================================
   Kod Bloklari (Monospace)
   ======================================== */
code, pre, kbd {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

pre {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    overflow-x: auto;
    font-size: 0.875rem;
    line-height: 1.7;
}

code {
    background: var(--surface-2);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.875em;
}

pre code {
    background: none;
    padding: 0;
    border-radius: 0;
}

/* ========================================
   Reduced Motion
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .course-card:hover,
    .feature-card:hover,
    .btn-primary:hover,
    .btn-outline:hover,
    .btn-register:hover,
    .btn-premium:hover,
    .btn-upgrade:hover {
        transform: none;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }
}

/* ========================================
   High Contrast Destegi
   ======================================== */
@media (prefers-contrast: high) {
    :root {
        --border: #000000;
        --border-2: #333333;
        --muted: #333333;
    }

    [data-theme="dark"] {
        --border: #FFFFFF;
        --border-2: #CCCCCC;
        --muted: #CCCCCC;
    }

    .btn-primary,
    .btn-register {
        border: 2px solid var(--ink);
    }
}

/* ========================================
   Responsive Tasarim
   ======================================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.75rem;
    }

    .footer-inner {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero {
        padding: 130px 0 60px;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .hero-stats {
        gap: 30px;
    }

    .stat-number {
        font-size: 2rem;
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .courses-grid {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .footer-inner {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .container {
        padding: 0 16px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.85rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        width: 100%;
    }

    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }

    .course-card {
        padding: 20px;
    }

    .cookie-content {
        flex-direction: column;
        text-align: center;
    }

    .cookie-actions {
        width: 100%;
    }

    .cookie-actions .cookie-btn {
        flex: 1;
    }
}

/* ============================================
   Ders 3B Şeridi — js/ders-3d.js
   Koyu, opak zemin; sayfa metnini örtmez.
   NOT: Ders sayfaları css/style.css yüklemez (global değişken ve
   başlık kuralları ders sayfası düzenini bozardı); oraya da birebir
   aynısı eklendi, ders sayfaları assets/css/ders-3d.css dosyasından
   bağlar. İki blok senkron tutulmalıdır.
   ============================================ */
.ders-3d-strip {
    position: relative;
    display: block;
    height: 300px;
    margin-top: 32px;
    background: #0E0E10;
    border: 1px solid rgba(255, 255, 255, .14);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 12px 30px rgba(4, 10, 14, .30);
}

/* Köşe vinyeti — sahneyi çerçeveye oturtur, metin okunurluğunu bozmaz */
.ders-3d-strip::after {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 2;
    pointer-events: none;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, .06);
}

.ders-3d-tag {
    position: absolute;
    top: 12px;
    left: 14px;
    z-index: 3;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 5px 11px;
    border-radius: 999px;
    background: rgba(14, 14, 16, .62);
    border: 1px solid rgba(255, 255, 255, .14);
    color: rgba(255, 255, 255, .78);
    font-size: .72rem;
    font-weight: 600;
    letter-spacing: .06em;
    text-transform: uppercase;
    line-height: 1.2;
    pointer-events: none;
}

.ders-3d-tag .ui-icon {
    width: 14px;
    height: 14px;
    color: var(--accent, #00D4AA);
}

@media (max-width: 768px) {
    .ders-3d-strip {
        height: 260px;
        margin-top: 24px;
        border-radius: 10px;
    }
}

/* Simülatör kartlari: ince hover */
.sim-card{transition:transform .18s ease,border-color .18s ease}
.sim-card:hover{transform:translateY(-1px);border-color:var(--accent,#0F6B7C)}