/* OpenContribute Design System - Unified UI Components */

/* ===== Color System ===== */
:root {
    /* Primary Colors */
    --primary: #0d6efd;
    --primary-dark: #0a58ca;
    --primary-light: #3d8bfd;
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    /* Secondary Colors */
    --secondary: #6c757d;
    --success: #198754;
    --danger: #dc3545;
    --warning: #ffc107;
    --info: #0dcaf0;

    /* Neutral Colors */
    --white: #ffffff;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    --black: #000000;

    /* Spacing System (8px grid) */
    --spacing-xs: 0.25rem;  /* 4px */
    --spacing-sm: 0.5rem;   /* 8px */
    --spacing-md: 1rem;     /* 16px */
    --spacing-lg: 1.5rem;   /* 24px */
    --spacing-xl: 2rem;     /* 32px */
    --spacing-xxl: 3rem;    /* 48px */

    /* Typography Scale */
    --font-size-xs: 0.75rem;   /* 12px */
    --font-size-sm: 0.875rem;  /* 14px */
    --font-size-base: 1rem;    /* 16px */
    --font-size-lg: 1.125rem;  /* 18px */
    --font-size-xl: 1.25rem;   /* 20px */
    --font-size-2xl: 1.5rem;   /* 24px */
    --font-size-3xl: 1.875rem; /* 30px */
    --font-size-4xl: 2.25rem;  /* 36px */

    /* Border Radius */
    --radius-sm: 4px;
    --radius-base: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-base: 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;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* ===== Button System ===== */
.btn {
    min-height: 44px !important;
    padding: 0.75rem 1.25rem !important;
    font-size: var(--font-size-base) !important;
    font-weight: 600;
    border-radius: var(--radius-base);
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    border: 2px solid transparent;
    cursor: pointer;
    line-height: 1.5;
}

/* Button Sizes */
.btn-sm {
    min-height: 36px !important;
    padding: 0.5rem 1rem !important;
    font-size: var(--font-size-sm) !important;
}

.btn-lg {
    min-height: 52px !important;
    padding: 1rem 1.5rem !important;
    font-size: var(--font-size-lg) !important;
}

/* Mobile Button Enhancements */
@media (max-width: 768px) {
    .btn {
        min-height: 48px !important;
        padding: 0.875rem 1.25rem !important;
    }

    .btn-sm {
        min-height: 44px !important;
        padding: 0.625rem 1rem !important;
    }
}

/* Button States */
.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-base);
}

.btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* ===== Card System ===== */
.card {
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    overflow: hidden;
    background: var(--white);
}

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

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

@media (max-width: 768px) {
    .card-body {
        padding: var(--spacing-md);
    }
}

/* Card Variants */
.card-clickable {
    cursor: pointer;
}

.card-compact .card-body {
    padding: var(--spacing-md);
}

/* ===== Text Truncation System ===== */
.text-truncate-1 {
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

.text-truncate-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

.text-truncate-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ===== Badge System ===== */
.badge {
    padding: 0.35rem 0.75rem;
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-full);
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    vertical-align: middle;
    line-height: 1;
}

.badge-sm {
    padding: 0.25rem 0.5rem;
    font-size: var(--font-size-xs);
}

.badge-lg {
    padding: 0.5rem 1rem;
    font-size: var(--font-size-base);
}

/* ===== Form System ===== */
.form-control,
.form-select {
    min-height: 44px !important;
    padding: 0.625rem 0.875rem !important;
    font-size: var(--font-size-base);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-base);
    transition: all var(--transition-base);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.15);
    outline: none;
}

.form-control-sm,
.form-select-sm {
    min-height: 36px !important;
    padding: 0.5rem 0.75rem !important;
    font-size: var(--font-size-sm);
}

.form-control-lg,
.form-select-lg {
    min-height: 52px !important;
    padding: 0.75rem 1rem !important;
    font-size: var(--font-size-lg);
}

/* Mobile Form Enhancements */
@media (max-width: 768px) {
    .form-control,
    .form-select {
        min-height: 48px !important;
        padding: 0.75rem 1rem !important;
        font-size: var(--font-size-base);
    }
}

/* Form Labels */
.form-label {
    font-weight: 600;
    font-size: var(--font-size-sm);
    margin-bottom: 0.5rem;
    color: var(--gray-700);
}

/* ===== Pagination System ===== */
.pagination {
    gap: 0.25rem;
}

.page-link {
    min-width: 44px;
    min-height: 44px;
    padding: 0.625rem 0.875rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-base);
    font-weight: 500;
    transition: all var(--transition-base);
    border: 1px solid var(--gray-300);
}

@media (max-width: 768px) {
    .page-link {
        min-width: 48px;
        min-height: 48px;
        font-size: var(--font-size-base);
    }

    .pagination {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}

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

.page-item.active .page-link {
    background-color: var(--primary);
    border-color: var(--primary);
    color: var(--white);
}

/* ===== Icon System ===== */
.icon-xs { font-size: 0.875rem !important; }
.icon-sm { font-size: 1rem !important; }
.icon-base { font-size: 1.25rem !important; }
.icon-lg { font-size: 1.5rem !important; }
.icon-xl { font-size: 2rem !important; }

/* ===== Hero Sections ===== */
.hero-section {
    padding: var(--spacing-xxl) 0;
    background: var(--primary-gradient);
    color: var(--white);
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
}

.hero-section h1 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.hero-section p {
    font-size: var(--font-size-lg);
    opacity: 0.95;
}

@media (max-width: 768px) {
    .hero-section {
        padding: var(--spacing-xl) 0;
    }

    .hero-section h1 {
        font-size: var(--font-size-2xl);
    }

    .hero-section p {
        font-size: var(--font-size-base);
    }
}

/* ===== Mobile Filter System ===== */
@media (max-width: 768px) {
    .filter-sidebar {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: var(--white);
        border-radius: var(--radius-xl) var(--radius-xl) 0 0;
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
        max-height: 70vh;
        overflow-y: auto;
        padding: var(--spacing-lg);
        z-index: 1030;
        transform: translateY(100%);
        transition: transform var(--transition-base);
    }

    .filter-sidebar.show {
        transform: translateY(0);
    }

    .filter-backdrop {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 1025;
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }

    .filter-backdrop.show {
        opacity: 1;
        visibility: visible;
    }
}

/* ===== Loading States ===== */
.spinner-border-sm {
    width: 1rem;
    height: 1rem;
    border-width: 0.2em;
}

.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

/* ===== Empty States ===== */
.empty-state {
    text-align: center;
    padding: var(--spacing-xxl) var(--spacing-lg);
}

.empty-state-icon {
    font-size: 4rem;
    color: var(--gray-400);
    margin-bottom: var(--spacing-lg);
}

.empty-state-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--gray-700);
}

.empty-state-text {
    font-size: var(--font-size-base);
    color: var(--gray-600);
    margin-bottom: var(--spacing-lg);
}

/* ===== Utility Classes ===== */
.touch-target {
    min-width: 44px;
    min-height: 44px;
}

@media (max-width: 768px) {
    .touch-target {
        min-width: 48px;
        min-height: 48px;
    }
}

.no-select {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.smooth-scroll {
    scroll-behavior: smooth;
}

/* ===== Responsive Grid Improvements ===== */
@media (max-width: 576px) {
    .col-xs-12 {
        width: 100% !important;
        flex: 0 0 100% !important;
    }

    .col-xs-6 {
        width: 50% !important;
        flex: 0 0 50% !important;
    }
}

/* ===== Animation Classes ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { transform: translateY(10px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.animate-fadeIn {
    animation: fadeIn var(--transition-base);
}

.animate-slideUp {
    animation: slideUp var(--transition-base);
}