/**
 * UniEduNote - Merkezi Tema Dosyası
 * Tüm projede tutarlı renk, tipografi ve stil tanımları
 */

/* ============================================
   RENK PALETİ
   ============================================ */
:root {
    /* Primary / Gradient */
    --primary-purple: #667eea;
    --primary-dark-purple: #764ba2;
    --primary-pink: #f093fb;
    --primary-red: #f5576c;
    
    /* Accent */
    --accent-blue: #4facfe;
    --accent-cyan: #00f2fe;
    
    /* Text */
    --text-primary: #1a202c;
    --text-secondary: #2d3748;
    --text-muted: #4a5568;
    --text-light: #718096;
    
    /* Glass / Background */
    --bg-glass: rgba(255, 255, 255, 0.7);
    --bg-glass-light: rgba(255, 255, 255, 0.9);
    --bg-glass-dark: rgba(255, 255, 255, 0.6);
    
    /* Shadow & Border */
    --shadow-sm: 0 4px 16px rgba(102, 126, 234, 0.2);
    --shadow-md: 0 8px 24px rgba(102, 126, 234, 0.4);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.08);
    
    /* Status Colors */
    --success: #34C759;
    --error: #FF3B30;
    --warning: #FF9500;
    --info: #007AFF;
    
    /* Background */
    --bg-color: #F2F2F7;
    
    /* Border Radius */
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --radius-full: 9999px;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 40px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Font Size Hierarchy */
h1, .h1 { font-size: 2.5rem; font-weight: 800; line-height: 1.2; letter-spacing: -0.02em; }
h2, .h2 { font-size: 2rem; font-weight: 800; line-height: 1.3; letter-spacing: -0.01em; }
h3, .h3 { font-size: 1.5rem; font-weight: 700; line-height: 1.4; }
h4, .h4 { font-size: 1.25rem; font-weight: 700; line-height: 1.4; }
h5, .h5 { font-size: 1.125rem; font-weight: 600; line-height: 1.5; }
h6, .h6 { font-size: 1rem; font-weight: 600; line-height: 1.5; }

p, .text { font-size: 1rem; line-height: 1.7; color: var(--text-secondary); }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-lg { font-size: 1.125rem; }

/* ============================================
   GLASS MORPHISM
   ============================================ */
.glass {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.6);
    box-shadow: var(--shadow-sm);
    border-radius: var(--radius-lg);
}

.glass-light {
    background: var(--bg-glass-light);
}

.glass-dark {
    background: var(--bg-glass-dark);
}

/* ============================================
   BUTONLAR
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 14px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-dark-purple) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary-purple);
    border: 1px solid rgba(102, 126, 234, 0.3);
}

.btn-secondary:hover {
    background: rgba(102, 126, 234, 0.2);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--primary-purple);
    border: 2px solid var(--primary-purple);
}

.btn-outline:hover {
    background: var(--primary-purple);
    color: white;
}

.btn-danger {
    background: var(--error);
    color: white;
}

.btn-danger:hover {
    background: #d32f2f;
    transform: translateY(-2px);
}

.btn-sm {
    padding: 10px 16px;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 18px 32px;
    font-size: 1.125rem;
}

/* ============================================
   KARTLAR
   ============================================ */
.card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-lg);
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.card-header {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.card-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.card-body {
    color: var(--text-secondary);
}

/* ============================================
   FORM ELEMANLARI
   ============================================ */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: var(--bg-glass-light);
    font-size: 1rem;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-purple);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    background: white;
}

.form-control::placeholder {
    color: var(--text-light);
}

/* ============================================
   GRID SİSTEMİ
   ============================================ */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.grid-auto {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

/* ============================================
   RESPONSIVE - MOBILE FIRST
   ============================================ */

/* Mobile (default - 768px ve altı) */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 16px;
        --spacing-xl: 24px;
    }
    
    h1, .h1 { font-size: 2rem; }
    h2, .h2 { font-size: 1.75rem; }
    h3, .h3 { font-size: 1.25rem; }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}

/* Tablet (769px - 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
    .grid-3,
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Desktop (1025px ve üzeri) */
@media (min-width: 1025px) {
    .container {
        padding: 0 var(--spacing-xl);
    }
}

/* ============================================
   UTİLİTY SINIFLARI
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }
.p-5 { padding: var(--spacing-xl); }

.d-flex { display: flex; }
.d-grid { display: grid; }
.d-none { display: none; }

.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--spacing-xs); }
.gap-2 { gap: var(--spacing-sm); }
.gap-3 { gap: var(--spacing-md); }
.gap-4 { gap: var(--spacing-lg); }

/* ============================================
   ANİMASYONLAR
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

.animate-fadeInUp {
    animation: fadeInUp 0.6s ease-out;
}

.animate-fadeIn {
    animation: fadeIn 0.4s ease-out;
}

.animate-slideIn {
    animation: slideIn 0.5s ease-out;
}

/* ============================================
   GRADIENT TEXT
   ============================================ */
.gradient-text {
    background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-dark-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}