/* ==========================================================================
   ÖZŞEN ÖZEL EĞİTİM KURSU - Design System & Base CSS
   LGS & YKS Sınav Hazırlık Merkezi
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Montserrat:wght@400;500;600;700;800;900&display=swap');

:root {
    /* Brand Colors (Aligned with Özşen Identity + Kurs Energy) */
    --bs-primary: #1B4D8E;
    --bs-primary-rgb: 27, 77, 142;
    --bs-secondary: #F5A623;
    --bs-secondary-rgb: 245, 166, 35;
    --bs-success: #2ECC71;
    --bs-success-rgb: 46, 204, 113;

    /* Core Tokens */
    --primary: #1B4D8E;
    --primary-dark: #0F2D5A;
    --primary-darker: #0A1C38;
    --primary-light: #2A69BA;
    --primary-50: #EEF4FB;
    --primary-100: #D8E6F7;

    --secondary: #F5A623;
    --secondary-dark: #D4891A;
    --secondary-light: #FFBF50;
    --secondary-50: #FFF9EE;

    --accent: #2ECC71;
    --accent-dark: #27AE60;
    --accent-light: #52D68A;
    --accent-50: #EDFAF3;

    --danger: #E74C3C;
    --danger-light: #FF6B5B;
    --info: #3498DB;

    /* Neutrals */
    --dark: #121824;
    --dark-surface: #1B2434;
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-muted: #94A3B8;
    --text-light: #F8FAFC;
    --border: #E2E8F0;
    --border-light: #F1F5F9;
    --bg: #F8FAFC;
    --bg-white: #FFFFFF;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #1B4D8E 0%, #0F2D5A 100%);
    --gradient-primary-glow: linear-gradient(135deg, #1B4D8E 0%, #2A69BA 50%, #0F2D5A 100%);
    --gradient-secondary: linear-gradient(135deg, #F5A623 0%, #FF9F00 100%);
    --gradient-hero: linear-gradient(135deg, #0A1C38 0%, #1B4D8E 60%, #0F2D5A 100%);
    --gradient-dark: linear-gradient(135deg, #121824 0%, #1B2434 100%);
    --gradient-accent: linear-gradient(135deg, #2ECC71 0%, #27AE60 100%);
    --gradient-card: linear-gradient(180deg, rgba(255,255,255,0.95) 0%, rgba(255,255,255,0.85) 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.12) 0%, rgba(255,255,255,0.03) 100%);

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(15, 45, 90, 0.04);
    --shadow-md: 0 6px 18px rgba(15, 45, 90, 0.08);
    --shadow-lg: 0 14px 32px rgba(15, 45, 90, 0.12);
    --shadow-xl: 0 24px 50px rgba(15, 45, 90, 0.16);
    --shadow-primary: 0 10px 25px rgba(27, 77, 142, 0.3);
    --shadow-secondary: 0 10px 25px rgba(245, 166, 35, 0.35);

    /* Border Radii */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 9999px;

    /* Fonts */
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    --font-heading: 'Montserrat', system-ui, -apple-system, sans-serif;

    /* Transitions */
    --transition-fast: 0.18s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-base: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
}

body {
    font-family: var(--font-primary);
    color: var(--text-primary);
    background-color: var(--bg);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6,
.font-heading {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--primary-dark);
    letter-spacing: -0.02em;
}

.text-white h1, .text-white h2, .text-white h3, .text-white h4, .text-white h5, .text-white h6,
.bg-primary-dark h1, .bg-primary-dark h2, .bg-primary-dark h3, .bg-primary-dark h4, .bg-primary-dark h5, .bg-primary-dark h6,
.hero-alt1 h1, .hero-alt1 h2, .hero-alt1 h3, .hero-alt1 h4, .hero-alt1 h5, .hero-alt1 h6 {
    color: #FFFFFF;
}

.bg-white h1, .bg-white h2, .bg-white h3, .bg-white h4, .bg-white h5, .bg-white h6,
.bg-light h1, .bg-light h2, .bg-light h3, .bg-light h4, .bg-light h5, .bg-light h6,
.text-dark h1, .text-dark h2, .text-dark h3, .text-dark h4, .text-dark h5, .text-dark h6 {
    color: var(--primary-dark);
}

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

a:hover {
    color: var(--secondary);
}

/* Utilities */
.bg-primary-dark { background-color: var(--primary-dark) !important; }
.bg-primary-darker { background-color: var(--primary-darker) !important; }
.bg-primary-50 { background-color: var(--primary-50) !important; }
.bg-secondary-50 { background-color: var(--secondary-50) !important; }
.bg-accent-50 { background-color: var(--accent-50) !important; }
.text-primary-dark { color: var(--primary-dark) !important; }
.text-secondary { color: var(--secondary) !important; }
.text-secondary-dark { color: var(--secondary-dark) !important; }
.text-accent { color: var(--accent) !important; }

.section-padding {
    padding: 5.5rem 0;
}

@media (max-width: 991px) {
    .section-padding {
        padding: 3.75rem 0;
    }
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-heading);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 1.2px;
    text-transform: uppercase;
    padding: 6px 16px;
    border-radius: var(--radius-full);
    background: var(--primary-50);
    color: var(--primary);
    margin-bottom: 1rem;
    border: 1px solid rgba(27, 77, 142, 0.15);
}

.section-tag.tag-secondary {
    background: var(--secondary-50);
    color: var(--secondary-dark);
    border-color: rgba(245, 166, 35, 0.25);
}

.section-tag.tag-light {
    background: rgba(255, 255, 255, 0.15);
    color: #FFFFFF;
    border-color: rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(8px);
}

.section-title {
    font-size: clamp(1.85rem, 3.5vw, 2.75rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 680px;
    margin: 0 auto 3rem;
}

/* Hover Lift Effect */
.hover-lift {
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hover-lift:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}