/* ===================================
   MODERN GLOBAL DESIGN SYSTEM
   AirlineManager - Consistent UI/UX
   =================================== */

:root {
    /* Primary Gradient Colors */
    --gradient-primary-start: #667eea;
    --gradient-primary-end: #764ba2;
    --gradient-secondary-start: #f093fb;
    --gradient-secondary-end: #f5576c;
    --gradient-success-start: #11998e;
    --gradient-success-end: #38ef7d;
    --gradient-warning-start: #f7b733;
    --gradient-warning-end: #fc4a1a;
    --gradient-danger-start: #eb3349;
    --gradient-danger-end: #f45c43;
    --gradient-info-start: #4facfe;
    --gradient-info-end: #00f2fe;
    /* Accent Colors */
    --accent-primary: #f093fb;
    --accent-secondary: #667eea;
    --accent-glow: rgba(102, 126, 234, 0.3);
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 15px 50px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 6px 20px var(--accent-glow);
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-xxl: 24px;
    --radius-pill: 50px;
    /* Transitions */
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    /* Typography */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
}

/* Dark Theme Overrides */
[data-bs-theme="dark"],
[data-bs-theme="dark-slate"],
[data-bs-theme="dark-midnight"] {
    --gradient-primary-start: #4a5568;
    --gradient-primary-end: #2d3748;
    --gradient-secondary-start: #805ad5;
    --gradient-secondary-end: #553c9a;
    --accent-primary: #9f7aea;
    --accent-secondary: #6b46c1;
    --accent-glow: rgba(159, 122, 234, 0.3);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 15px 50px rgba(0, 0, 0, 0.6);
}

/* ===================================
MODERN CARDS
   =================================== */
.card-modern {
    border-radius: var(--radius-xl);
    border: none;
    box-shadow: var(--shadow-lg);
    transition: var(--transition-base);
    overflow: hidden;
    background: var(--bs-body-bg);
}

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

.card-gradient {
    background: linear-gradient(135deg, var(--gradient-primary-start), var(--gradient-primary-end));
    color: white;
}

.card-glass {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.card-header-modern {
    background: linear-gradient(135deg, var(--gradient-primary-start), var(--gradient-primary-end));
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: none;
    font-weight: var(--font-weight-bold);
}

.card-body-modern {
    padding: var(--spacing-lg);
}

/* ===================================
   MODERN BUTTONS
   =================================== */
.btn-modern {
    padding: 12px 32px;
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-md);
    border: none;
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

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

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

.btn-gradient-primary {
    background: linear-gradient(135deg, var(--gradient-primary-start), var(--gradient-primary-end));
    color: white;
}

.btn-gradient-success {
    background: linear-gradient(135deg, var(--gradient-success-start), var(--gradient-success-end));
    color: white;
}

.btn-gradient-warning {
    background: linear-gradient(135deg, var(--gradient-warning-start), var(--gradient-warning-end));
    color: white;
}

.btn-gradient-danger {
    background: linear-gradient(135deg, var(--gradient-danger-start), var(--gradient-danger-end));
    color: white;
}

.btn-gradient-info {
    background: linear-gradient(135deg, var(--gradient-info-start), var(--gradient-info-end));
    color: white;
}

/* Ripple Effect */
.btn-modern::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-modern:active::before {
    width: 300px;
    height: 300px;
}

/* ===================================
   MODERN FORM CONTROLS
   =================================== */
.form-control-modern {
    border-radius: var(--radius-md);
    border: 2px solid var(--bs-border-color);
    padding: 0.75rem 1rem;
    transition: var(--transition-base);
    box-shadow: var(--shadow-sm);
}

    .form-control-modern:focus {
        border-color: var(--gradient-primary-start);
        box-shadow: 0 0 0 0.25rem var(--accent-glow);
        transform: translateY(-1px);
    }

.input-group-modern {
    box-shadow: var(--shadow-sm);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition-base);
}

    .input-group-modern:focus-within {
        box-shadow: var(--shadow-glow);
        transform: translateY(-1px);
    }

    .input-group-modern .input-group-text {
        background: linear-gradient(135deg, var(--gradient-primary-start), var(--gradient-primary-end));
        color: white;
        border: none;
        padding: 0.75rem 1rem;
    }

    .input-group-modern .form-control {
        border: none;
        border-left: 1px solid var(--bs-border-color);
        padding: 0.75rem 1rem;
    }

/* ===================================
   MODERN ALERTS
   =================================== */
.alert-modern {
    border-radius: var(--radius-lg);
    border: none;
    box-shadow: var(--shadow-md);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    animation: slideInDown 0.5s ease;
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-modern i {
    font-size: 1.5rem;
}

.alert-gradient-success {
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    color: #155724;
}

.alert-gradient-warning {
    background: linear-gradient(135deg, #fff3cd 0%, #ffeaa7 100%);
    color: #856404;
}

.alert-gradient-danger {
    background: linear-gradient(135deg, #f8d7da 0%, #f5c6cb 100%);
    color: #721c24;
}

.alert-gradient-info {
    background: linear-gradient(135deg, #d1ecf1 0%, #bee5eb 100%);
    color: #0c5460;
}

/* ===================================
   MODERN BADGES
   =================================== */
.badge-modern {
    padding: 0.5em 1em;
    border-radius: var(--radius-sm);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    box-shadow: var(--shadow-sm);
}

.badge-gradient-primary {
    background: linear-gradient(135deg, var(--gradient-primary-start), var(--gradient-primary-end));
    color: white;
}

.badge-gradient-success {
    background: linear-gradient(135deg, var(--gradient-success-start), var(--gradient-success-end));
    color: white;
}

/* ===================================
   MODERN TABLES
   =================================== */
.table-modern {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

    .table-modern thead {
        background: linear-gradient(135deg, var(--gradient-primary-start), var(--gradient-primary-end));
        color: white;
    }

        .table-modern thead th {
            border: none;
            padding: var(--spacing-md) var(--spacing-lg);
            font-weight: var(--font-weight-bold);
        }

    .table-modern tbody tr {
        transition: var(--transition-fast);
    }

        .table-modern tbody tr:hover {
            background-color: var(--bs-tertiary-bg);
            transform: scale(1.01);
        }

    .table-modern tbody td {
        padding: var(--spacing-md) var(--spacing-lg);
        border-color: var(--bs-border-color);
    }

/* ===================================
   MODERN MODALS
   =================================== */
.modal-content-modern {
    border-radius: var(--radius-xxl);
    border: none;
    box-shadow: 0 25px 75px rgba(0, 0, 0, 0.4);
    animation: modalSlideIn 0.4s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header-modern {
    background: linear-gradient(135deg, var(--gradient-primary-start), var(--gradient-primary-end));
    color: white;
    border-top-left-radius: var(--radius-xxl);
    border-top-right-radius: var(--radius-xxl);
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: none;
}

.modal-body-modern {
    padding: var(--spacing-lg);
}

.modal-footer-modern {
    border-top: none;
    padding: var(--spacing-md) var(--spacing-lg);
}

/* ===================================
MODERN NAVIGATION
   =================================== */
.nav-modern {
    border-bottom: none;
    gap: var(--spacing-xs);
    padding: 0;
    flex-wrap: wrap;
}

    .nav-modern .nav-link {
        border: none;
        border-radius: var(--radius-lg);
        padding: 14px 24px;
        font-weight: var(--font-weight-semibold);
        color: var(--bs-body-color);
        background: var(--bs-body-bg);
        box-shadow: var(--shadow-sm);
        transition: var(--transition-base);
        position: relative;
        overflow: hidden;
    }

        .nav-modern .nav-link:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
            color: var(--bs-primary);
        }

        .nav-modern .nav-link.active {
            background: linear-gradient(135deg, var(--gradient-primary-start), var(--gradient-primary-end));
            color: white;
            box-shadow: var(--shadow-glow);
            transform: translateY(-2px);
        }

/* ===================================
   MODERN PAGINATION
   =================================== */
.pagination-modern .page-link {
    border-radius: var(--radius-sm);
    margin: 0 4px;
    border: none;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
}

    .pagination-modern .page-link:hover {
        background: linear-gradient(135deg, var(--gradient-primary-start), var(--gradient-primary-end));
        color: white;
        transform: translateY(-2px);
        box-shadow: var(--shadow-md);
    }

.pagination-modern .page-item.active .page-link {
    background: linear-gradient(135deg, var(--gradient-primary-start), var(--gradient-primary-end));
    border: none;
    box-shadow: var(--shadow-glow);
}

/* ===================================
   MODERN DROPDOWN
 =================================== */
.dropdown-menu-modern {
    border-radius: var(--radius-lg);
    border: none;
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-sm);
    animation: dropdownFadeIn 0.3s ease;
}

@keyframes dropdownFadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dropdown-menu-modern .dropdown-item {
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    transition: var(--transition-fast);
}

    .dropdown-menu-modern .dropdown-item:hover {
        background: linear-gradient(135deg, var(--gradient-primary-start), var(--gradient-primary-end));
        color: white;
        transform: translateX(4px);
    }

/* ===================================
   MODERN BREADCRUMBS
   =================================== */
.breadcrumb-modern {
    background: var(--bs-body-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

    .breadcrumb-modern .breadcrumb-item + .breadcrumb-item::before {
        content: "›";
        font-size: 1.2rem;
    }

    .breadcrumb-modern .breadcrumb-item.active {
        color: var(--gradient-primary-start);
        font-weight: var(--font-weight-semibold);
    }

/* ===================================
   MODERN PROGRESS BARS
   =================================== */
.progress-modern {
    border-radius: var(--radius-pill);
    height: 12px;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress-bar-gradient {
    background: linear-gradient(90deg, var(--gradient-primary-start), var(--gradient-primary-end));
    border-radius: var(--radius-pill);
    transition: var(--transition-base);
}

/* ===================================
   MODERN TOOLTIPS
   =================================== */
.tooltip-modern .tooltip-inner {
    background: linear-gradient(135deg, var(--gradient-primary-start), var(--gradient-primary-end));
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    box-shadow: var(--shadow-md);
}

/* ===================================
   UTILITY CLASSES
   =================================== */
.gradient-text {
    background: linear-gradient(135deg, var(--gradient-primary-start), var(--gradient-primary-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

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

.glass-effect {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.glow-effect {
    box-shadow: var(--shadow-glow);
}

/* ===================================
   ANIMATIONS
   =================================== */
.fade-in {
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.slide-in-up {
    animation: slideInUp 0.5s ease;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.scale-in {
    animation: scaleIn 0.3s ease;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ===================================
   RESPONSIVE UTILITIES
   =================================== */
@media (max-width: 768px) {
    .card-modern {
        border-radius: var(--radius-lg);
    }

    .btn-modern {
        width: 100%;
        margin-bottom: var(--spacing-xs);
    }

    .modal-content-modern {
        border-radius: var(--radius-lg);
    }
}

/* ===================================
   ACCESSIBILITY
   =================================== */
.btn-modern:focus-visible,
.form-control-modern:focus-visible,
.nav-modern .nav-link:focus-visible {
    outline: 3px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}