/* ===================================
   Akademik İşbirliği Platformu
   Custom CSS Styles
   =================================== */

/* ===================================
   1. GENEL AYARLAR
   =================================== */

:root {
    /* Ana Renkler */
    --primary-color: #1e40af;
    --primary-dark: #1e3a8a;
    --primary-light: #3b82f6;
    --secondary-color: #7c3aed;
    --success-color: #059669;
    --warning-color: #f59e0b;
    --danger-color: #dc2626;
    --info-color: #0891b2;
    
    /* Nötr Renkler */
    --light-bg: #f3f4f6;
    --white: #ffffff;
    --gray-100: #f9fafb;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-500: #6b7280;
    --gray-700: #374151;
    --gray-900: #111827;
    
    /* Tipografi */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Poppins', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 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);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

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

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-700);
    background-color: var(--light-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    color: var(--gray-900);
}

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

a:hover {
    color: var(--primary-dark);
}

/* ===================================
   2. NAVBAR ÖZELLEŞTIRME
   =================================== */

.navbar {
    padding: 1rem 0;
    backdrop-filter: blur(10px);
}

.navbar-brand {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.25rem;
    transition: transform var(--transition-fast);
}

.navbar-brand:hover {
    transform: translateY(-2px);
}

.navbar-nav .nav-link {
    font-weight: 500;
    padding: 0.5rem 1rem;
    margin: 0 0.25rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.navbar-nav .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.navbar-nav .nav-link.active {
    background-color: rgba(255, 255, 255, 0.2);
    font-weight: 600;
}

/* ===================================
   3. KARTLAR VE CONTAINER'LAR
   =================================== */

.card {
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.card:hover {
    transform: translateY(-2px);
}

.hover-card {
    cursor: pointer;
}

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

.hover-lift {
    transition: all var(--transition-normal);
}

.hover-lift:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl) !important;
}

.shadow-sm {
    box-shadow: var(--shadow-sm) !important;
}

.shadow-md {
    box-shadow: var(--shadow-md) !important;
}

.shadow-lg {
    box-shadow: var(--shadow-lg) !important;
}

/* ===================================
   4. BUTONLAR
   =================================== */

.btn {
    font-weight: 500;
    border-radius: var(--radius-md);
    padding: 0.5rem 1.25rem;
    transition: all var(--transition-fast);
    border: none;
    position: relative;
    overflow: hidden;
}

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

.btn:active {
    transform: translateY(0);
}

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

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color) 0%, #047857 100%);
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning-color) 0%, #d97706 100%);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color) 0%, #b91c1c 100%);
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1.125rem;
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
}

/* Button Group Styles */
.btn-check:checked + .btn-outline-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.btn-check:checked + .btn-outline-success {
    background-color: var(--success-color);
    border-color: var(--success-color);
    color: white;
}

.btn-check:checked + .btn-outline-warning {
    background-color: var(--warning-color);
    border-color: var(--warning-color);
    color: white;
}

.btn-check:checked + .btn-outline-danger {
    background-color: var(--danger-color);
    border-color: var(--danger-color);
    color: white;
}

/* ===================================
   5. FORMLAR
   =================================== */

.form-control,
.form-select {
    border-radius: var(--radius-md);
    border: 2px solid var(--gray-200);
    padding: 0.625rem 1rem;
    transition: all var(--transition-fast);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.form-check-input {
    border-radius: var(--radius-sm);
    border: 2px solid var(--gray-300);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.form-check-input:focus {
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.form-check-label {
    cursor: pointer;
    user-select: none;
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

/* ===================================
   6. BADGES
   =================================== */

.badge {
    font-weight: 500;
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.badge i {
    font-size: 0.875rem;
}

/* ===================================
   7. ALERTS
   =================================== */

.alert {
    border-radius: var(--radius-lg);
    border: none;
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.alert-success {
    background-color: rgba(5, 150, 105, 0.1);
    color: var(--success-color);
}

.alert-danger {
    background-color: rgba(220, 38, 38, 0.1);
    color: var(--danger-color);
}

.alert-warning {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.alert-info {
    background-color: rgba(8, 145, 178, 0.1);
    color: var(--info-color);
}

/* ===================================
   8. MODAL
   =================================== */

.modal-content {
    border-radius: var(--radius-xl);
    border: none;
    box-shadow: var(--shadow-xl);
}

.modal-header {
    border-bottom: 2px solid var(--gray-200);
    padding: 1.5rem;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    border-top: 2px solid var(--gray-200);
    padding: 1.5rem;
}

.modal-backdrop {
    backdrop-filter: blur(2px);
}

/* ===================================
   9. NAVIGATION PILLS
   =================================== */

.nav-pills .nav-link {
    border-radius: var(--radius-md);
    font-weight: 500;
    padding: 0.625rem 1.25rem;
    transition: all var(--transition-fast);
    color: var(--gray-700);
}

.nav-pills .nav-link:hover {
    background-color: var(--gray-100);
    color: var(--primary-color);
}

.nav-pills .nav-link.active {
    background-color: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-md);
}

.nav-pills .nav-link .badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
}

/* ===================================
   10. ÖZEL BILEŞENLER
   =================================== */

/* Hero Section */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.hero-section h1 {
    color: white;
}

.hero-image .placeholder-image {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* Feature Icons */
.feature-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.hover-lift .feature-icon {
    transition: all var(--transition-normal);
}

.hover-lift:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

/* Step Numbers */
.step-number {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    box-shadow: var(--shadow-md);
}

/* Progress Steps */
.step-circle {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--gray-200);
    color: var(--gray-500);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    margin: 0 auto;
    transition: all var(--transition-fast);
}

.step-circle.active {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 0 0 4px rgba(30, 64, 175, 0.2);
}

.step-circle.completed {
    background-color: var(--success-color);
    color: white;
    box-shadow: 0 0 0 4px rgba(5, 150, 105, 0.2);
}

/* Gradient Background */
.bg-gradient-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%) !important;
}

/* Sticky Elements */
.sticky-top {
    position: sticky;
    top: 20px;
    z-index: 1020;
}

/* ===================================
   11. ANIMASYONLAR
   =================================== */

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

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-right {
    animation: slideInRight 0.5s ease-out;
}

/* Loading Spinner */
.spinner-border {
    animation: spinner-border 0.75s linear infinite;
}

/* ===================================
   12. RESPONSIVE DESIGN
   =================================== */

/* Tablet */
@media (max-width: 991.98px) {
    .navbar-collapse {
        background-color: rgba(255, 255, 255, 0.95);
        padding: 1rem;
        margin-top: 1rem;
        border-radius: var(--radius-lg);
    }
    
    .navbar-dark .navbar-collapse {
        background-color: rgba(30, 58, 138, 0.95);
    }
}

/* Mobile */
@media (max-width: 767.98px) {
    .hero-section {
        padding: 2rem 0;
    }
    
    .display-4 {
        font-size: 2rem;
    }
    
    .display-5 {
        font-size: 1.75rem;
    }
    
    .card-body {
        padding: 1.25rem !important;
    }
    
    .modal-dialog {
        margin: 0.5rem;
    }
    
    .btn-lg {
        padding: 0.625rem 1.25rem;
        font-size: 1rem;
    }
}

/* Small Mobile */
@media (max-width: 575.98px) {
    body {
        font-size: 14px;
    }
    
    h1, h2, h3 {
        font-size: 1.5rem;
    }
    
    .container-fluid {
        padding-left: 1rem;
        padding-right: 1rem;
    }
}

/* ===================================
   13. UTILITY CLASSES
   =================================== */

/* Text Colors */
.text-primary {
    color: var(--primary-color) !important;
}

.text-success {
    color: var(--success-color) !important;
}

.text-warning {
    color: var(--warning-color) !important;
}

.text-danger {
    color: var(--danger-color) !important;
}

/* Background Colors */
.bg-light {
    background-color: var(--light-bg) !important;
}

/* Spacing Utilities */
.gap-1 {
    gap: var(--spacing-xs);
}

.gap-2 {
    gap: var(--spacing-sm);
}

.gap-3 {
    gap: var(--spacing-md);
}

.gap-4 {
    gap: var(--spacing-lg);
}

/* Border Radius */
.rounded-xl {
    border-radius: var(--radius-xl) !important;
}

/* Cursor */
.cursor-pointer {
    cursor: pointer;
}

/* Transitions */
.transition-all {
    transition: all var(--transition-normal);
}

/* ===================================
   14. SCROLL BAR ÖZELLEŞTIRME
   =================================== */

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: var(--radius-md);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* ===================================
   15. PRINT STYLES
   =================================== */

@media print {
    .navbar,
    .btn,
    .modal,
    .alert {
        display: none !important;
    }
    
    body {
        background-color: white;
    }
}

/* ===================================
   16. ACCESSIBILITY
   =================================== */

/* Focus Styles */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.btn:focus,
.form-control:focus,
.form-select:focus,
.form-check-input:focus {
    outline: none;
}

/* Skip to Content Link */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}

.skip-to-content:focus {
    top: 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;
    }
}

/* ===================================
   17. DROPDOWN Z-INDEX FIX
   =================================== */

/* Navbar dropdown'ları her zaman en üstte olsun */
.navbar {
    z-index: 1030 !important;
}

.navbar .dropdown-menu {
    z-index: 1031 !important;
}

/* Bootstrap dropdown genel fix */
.dropdown-menu {
    z-index: 1050 !important;
}

.dropdown-menu.show {
    z-index: 1050 !important;
}

/* Navbar'daki user dropdown özel fix */
#userDropdown {
    position: relative;
    z-index: 1032 !important;
}

.navbar-nav .dropdown {
    position: relative;
    z-index: 1032 !important;
}

.navbar-nav .dropdown-menu {
    z-index: 1033 !important;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15) !important;
}

/* Butonlar dropdown'un arkasında kalmasın */
.btn,
.card {
    z-index: 1 !important;
    position: relative;
}

/* Page header butonları */
.row .btn {
    z-index: 1 !important;
}

/* Sticky navbar fix */
.sticky-top {
    z-index: 1020 !important;
}

/* Modal backdrop ve modal */
.modal-backdrop {
    z-index: 1040 !important;
}

.modal {
    z-index: 1041 !important;
}

/* Tooltip ve popover */
.tooltip {
    z-index: 1070 !important;
}

.popover {
    z-index: 1060 !important;
}