/**
 * RFP Management System - Design System
 * A comprehensive, production-ready design system for a modern web application.
 */

:root {
    /* Colors */
    --color-primary: #1e293b;       /* Slate 800 */
    --color-primary-light: #334155; /* Slate 700 */
    --color-accent: #0ea5e9;        /* Sky 500 */
    --color-accent-hover: #0284c7;  /* Sky 600 */
    --color-accent-light: #e0f2fe;  /* Sky 50 */
    --color-success: #22c55e;
    --color-success-light: #dcfce7;
    --color-warning: #f59e0b;
    --color-warning-light: #fef3c7;
    --color-danger: #ef4444;
    --color-danger-light: #fee2e2;
    --color-purple: #8b5cf6;
    --color-purple-light: #ede9fe;
    --color-gray: #6b7280;
    --color-gray-light: #f3f4f6;
    
    /* Surfaces */
    --bg-body: #f1f5f9;            /* Slate 100 */
    --bg-card: #ffffff;
    --bg-card-hover: #f8fafc;
    --bg-input: #ffffff;
    --border-color: #e2e8f0;       /* Slate 200 */
    --border-color-focus: var(--color-accent);
    
    /* Text */
    --text-primary: #0f172a;       /* Slate 900 */
    --text-secondary: #64748b;     /* Slate 500 */
    --text-muted: #94a3b8;         /* Slate 400 */
    --text-inverse: #ffffff;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.8125rem;  /* 13px */
    --font-size-base: 0.875rem; /* 14px */
    --font-size-md: 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 */
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    
    /* Borders & Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.05);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Layout */
    --navbar-height: 64px;
    --container-max: 100%;
}

/* 1. Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-body);
    font-family: var(--font-family);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* 2. Layout */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.main-content {
    padding-top: calc(var(--navbar-height) + var(--space-8));
    padding-bottom: var(--space-12);
    min-height: calc(100vh - var(--navbar-height));
}

.grid {
    display: grid;
    gap: var(--space-6);
}

.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--5 { grid-template-columns: repeat(5, 1fr); }

/* 3. Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background-color: white;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    z-index: 50;
    display: flex;
    align-items: center;
}

.navbar__container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-4);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar__brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-weight: 700;
    font-size: var(--font-size-lg);
    color: var(--color-primary);
}

.navbar__brand-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background-color: var(--color-accent);
    color: white;
    border-radius: var(--radius-full);
}

.navbar__toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.navbar__menu {
    display: flex;
    gap: var(--space-4);
    align-items: center;
}

.navbar__link {
    color: var(--text-secondary);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: var(--transition-fast);
}

.navbar__link:hover {
    color: var(--text-primary);
    background-color: var(--bg-card-hover);
}

.navbar__link.active {
    background-color: var(--color-accent-light);
    color: var(--color-accent);
}

.navbar__user {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.navbar__avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background-color: var(--color-accent);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: var(--font-size-sm);
}

.navbar__user-info {
    display: flex;
    flex-direction: column;
    line-height: 1.3;
}

.navbar__user-name {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.navbar__user-role {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    text-transform: capitalize;
}

.navbar__logout {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    color: var(--text-muted);
    transition: all var(--transition-fast);
}

.navbar__logout:hover {
    background-color: var(--color-danger-light);
    color: var(--color-danger);
}

/* 4. Cards */
.card {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-1px);
}

.card__header {
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card__header-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.card__body {
    padding: var(--space-5);
}

/* 5. Stat Cards */
.stat-card {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    background-color: var(--bg-card);
    padding: var(--space-5);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.stat-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-1px);
}

.stat-card__icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-card__content {
    flex: 1;
}

.stat-card__label {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.stat-card__value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-card--blue .stat-card__icon { background-color: var(--color-accent-light); color: var(--color-accent); }
.stat-card--green .stat-card__icon { background-color: var(--color-success-light); color: var(--color-success); }
.stat-card--amber .stat-card__icon { background-color: var(--color-warning-light); color: #d97706; }
.stat-card--red .stat-card__icon { background-color: var(--color-danger-light); color: var(--color-danger); }
.stat-card--purple .stat-card__icon { background-color: var(--color-purple-light); color: var(--color-purple); }

/* 6. Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: 1px solid transparent;
    gap: 8px;
    line-height: 1.5;
}

.btn:active {
    transform: scale(0.97);
}

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

.btn--success {
    background-color: var(--color-success);
    color: white;
}
.btn--success:hover {
    background-color: #16a34a;
}

.btn--danger {
    background-color: var(--color-danger);
    color: white;
}
.btn--danger:hover {
    background-color: #dc2626;
}

.btn--outline {
    border-color: var(--border-color);
    background-color: transparent;
    color: var(--text-secondary);
}
.btn--outline:hover {
    background-color: var(--color-gray-light);
    color: var(--text-primary);
}

.btn--ghost {
    background-color: transparent;
    color: var(--text-secondary);
}
.btn--ghost:hover {
    background-color: var(--color-gray-light);
    color: var(--text-primary);
}

.btn--block {
    width: 100%;
}

.btn--sm {
    padding: 6px 12px;
    font-size: var(--font-size-xs);
}

.btn--lg {
    padding: 12px 24px;
    font-size: var(--font-size-base);
}

/* 7. Forms */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    font-weight: 500;
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-2);
    color: var(--text-primary);
}

.form-control, .form-select, .form-textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    background-color: var(--bg-input);
    color: var(--text-primary);
    transition: all var(--transition-fast);
    font-family: inherit;
}

.form-control:focus, .form-select:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--border-color-focus);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

.form-control--error {
    border-color: var(--color-danger);
}
.form-control--error:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%2364748b' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: 2.5rem;
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

.form-input-wrapper {
    position: relative;
}

.form-input-wrapper i,
.form-input-wrapper svg {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.form-input-wrapper .form-control {
    padding-left: 40px;
}

.form-hint {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    margin-top: var(--space-1);
}

.form-error {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--color-danger);
    margin-top: var(--space-1);
}

.form-row {
    display: flex;
    gap: var(--space-4);
}
.form-row > * {
    flex: 1;
}

/* 8. Tables */
.table-responsive {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    background: white;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    background-color: #f8fafc;
    font-weight: 600;
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
}

.data-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    font-size: var(--font-size-sm);
    vertical-align: middle;
    color: var(--text-primary);
    word-break: break-word;
}

.data-table tr:hover {
    background-color: var(--bg-card-hover);
}

.data-table tr:last-child td {
    border-bottom: none;
}

/* 9. Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 600;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.badge--new { background-color: #ccfbf1; color: #0d9488; }
.badge--expired { background-color: var(--color-danger-light); color: var(--color-danger); }
.badge--valid { background-color: var(--color-success-light); color: #16a34a; }
.badge--working { background-color: var(--color-accent-light); color: var(--color-accent); }
.badge--submitted { background-color: var(--color-purple-light); color: var(--color-purple); }
.badge--not-eligible { background-color: var(--color-gray-light); color: var(--color-gray); }
.badge--follow-up { background-color: var(--color-warning-light); color: #d97706; }

/* 10. Alerts */
.alert {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: 14px 18px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--space-6);
    border: 1px solid transparent;
}

.alert--success {
    background-color: var(--color-success-light);
    color: #16a34a;
    border-color: rgba(34, 197, 94, 0.2);
}

.alert--error {
    background-color: var(--color-danger-light);
    color: var(--color-danger);
    border-color: rgba(239, 68, 68, 0.2);
}

.alert--warning {
    background-color: var(--color-warning-light);
    color: #d97706;
    border-color: rgba(245, 158, 11, 0.2);
}

.alert--info {
    background-color: var(--color-accent-light);
    color: var(--color-accent);
    border-color: rgba(14, 165, 233, 0.2);
}

.alert__close {
    margin-left: auto;
    background: none;
    border: none;
    cursor: pointer;
    font-size: var(--font-size-lg);
    color: inherit;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.alert__close:hover {
    opacity: 1;
}

/* 11. Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.page-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.page-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-top: var(--space-1);
}

/* 12. Login Page */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    background-size: cover;
    padding: var(--space-4);
}

.login-container {
    width: 100%;
    max-width: 420px;
}

.login-card {
    background-color: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.login-card__header {
    padding: 40px 32px 24px;
    text-align: center;
}

.login-card__icon {
    width: 64px;
    height: 64px;
    background-color: var(--color-accent-light);
    color: var(--color-accent);
    border-radius: var(--radius-full);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: var(--space-4);
}

.login-card__header h1 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.login-card__header p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.login-card__form {
    padding: 0 32px 40px;
}

.login-card__error {
    background-color: var(--color-danger-light);
    color: var(--color-danger);
    padding: 10px 14px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-4);
    border: 1px solid rgba(239, 68, 68, 0.2);
    text-align: center;
}

/* 13. File Upload Zone */
.upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    background-color: var(--bg-card);
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--color-accent);
    background-color: rgba(14, 165, 233, 0.05); /* accent-light but more subtle */
}

.upload-zone__icon {
    font-size: 2rem;
    color: var(--text-muted);
    margin-bottom: var(--space-3);
}

.upload-zone__text {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.file-list {
    margin-top: var(--space-4);
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    background-color: var(--color-gray-light);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-2);
    font-size: var(--font-size-sm);
}

.file-item__remove {
    color: var(--color-danger);
    cursor: pointer;
    background: none;
    border: none;
    padding: 4px;
}

/* 14. Contact Row */
.contact-row {
    display: flex;
    gap: var(--space-4);
    align-items: flex-end;
    padding: var(--space-4);
    background-color: var(--color-gray-light);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-3);
    position: relative;
    border: 1px solid var(--border-color);
}

.contact-row .form-group {
    flex: 1;
    margin-bottom: 0;
}

.contact-row__remove {
    position: absolute;
    top: -10px;
    right: -10px;
    background-color: var(--color-danger);
    color: white;
    border-radius: var(--radius-full);
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-fast);
}

.contact-row__remove:hover {
    background-color: #dc2626; /* darker danger */
}

/* 15. Detail View */
.detail-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
}

.detail-item {
    margin-bottom: var(--space-4);
}

.detail-item label {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.detail-item .value {
    display: block;
    font-size: var(--font-size-base);
    color: var(--text-primary);
    margin-top: var(--space-1);
}

.detail-section {
    margin-bottom: var(--space-8);
}

.detail-section__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    padding-bottom: var(--space-3);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

/* 16. Pagination */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    margin-top: var(--space-8);
}

.pagination__link {
    padding: 8px 14px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    font-weight: 500;
}

.pagination__link:hover {
    background-color: var(--color-gray-light);
    color: var(--text-primary);
}

.pagination__link.active {
    background-color: var(--color-accent);
    color: white;
}

/* 17. Empty State */
.empty-state {
    text-align: center;
    padding: var(--space-12) var(--space-4);
    color: var(--text-muted);
}

.empty-state__icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
    opacity: 0.4;
}

.empty-state__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

.empty-state__text {
    font-size: var(--font-size-sm);
    max-width: 400px;
    margin: 0 auto;
}

/* 18. Filter Bar */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
    padding: var(--space-4);
    background-color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    align-items: flex-end;
    border: 1px solid var(--border-color);
}

.filter-bar .form-group {
    margin-bottom: 0;
    flex: 1;
    min-width: 180px;
}

.search-input {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394a3b8'%3e%3cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z'/%3e%3c/svg%3e");
    background-position: 12px center;
    background-repeat: no-repeat;
    background-size: 16px;
    padding-left: 36px;
}

/* 19. Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 60;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    backdrop-filter: blur(2px);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background-color: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 90%;
    transform: scale(0.95);
    transition: transform var(--transition-base);
    overflow: hidden;
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal__header {
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.modal__close {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--text-muted);
    cursor: pointer;
}
.modal__close:hover { color: var(--text-primary); }

.modal__body {
    padding: var(--space-6);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.modal__footer {
    padding: var(--space-4) var(--space-6);
    background-color: var(--color-gray-light);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
}

/* 20. Utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }
.text-muted { color: var(--text-muted); }
.text-danger { color: var(--color-danger); }
.text-success { color: var(--color-success); }
.text-primary { color: var(--color-primary); }

.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-center { display: flex; justify-content: center; align-items: center; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }

.hidden { display: none !important; }
.visible-mobile { display: none; }

/* 21. Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

.animate-slideUp {
    opacity: 0;
    animation: slideUp var(--transition-base) forwards;
}

/* Stagger card animations */
.grid > .card:nth-child(1) { animation-delay: 0.05s; }
.grid > .card:nth-child(2) { animation-delay: 0.1s; }
.grid > .card:nth-child(3) { animation-delay: 0.15s; }
.grid > .card:nth-child(4) { animation-delay: 0.2s; }
.grid > .card:nth-child(5) { animation-delay: 0.25s; }
.grid > .card:nth-child(n+6) { animation-delay: 0.3s; }

/* 22. Responsive Breakpoints */

/* Tablet and below */
@media (max-width: 1024px) {
    .grid--3, .grid--4, .grid--5 {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Mobile */
@media (max-width: 640px) {
    .grid, .grid--2, .grid--3, .grid--4, .grid--5 {
        grid-template-columns: 1fr;
    }

    .detail-grid {
        grid-template-columns: 1fr;
    }

    .navbar__toggle {
        display: block;
    }

    .navbar__menu {
        display: none;
        position: absolute;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: var(--space-4);
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
        gap: var(--space-2);
        align-items: flex-start;
    }

    .navbar__menu.active {
        display: flex;
    }

    .navbar__link {
        width: 100%;
    }

    .navbar__user {
        width: 100%;
        padding-top: var(--space-4);
        margin-top: var(--space-2);
        border-top: 1px solid var(--border-color);
    }

    .form-row {
        flex-direction: column;
    }
    
    .contact-row {
        flex-direction: column;
        align-items: stretch;
    }

    .hidden-mobile {
        display: none !important;
    }

    .visible-mobile {
        display: block;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .filter-bar {
        flex-direction: column;
        align-items: stretch;
    }
}

/* Logo Styles */
.navbar__logo { max-height: 40px; width: auto; object-fit: contain; }
.login-card__logo { max-height: 80px; width: auto; object-fit: contain; margin-bottom: 16px; }