/* ============================================================================
   Modern Utilitarian Design System
   Primary Color: #113555 (Dark Blue)
   Design Philosophy: Clean, Functional, Consistent
   ============================================================================ */

/* ==========================================================================
   CSS Variables - Design Tokens
   ========================================================================== */
:root {
    /* Colors */
    --primary: #113555;
    --primary-light: #1a4a75;
    --primary-dark: #0a2135;
    --primary-hover: #0f2d48;

    --success: #10b981;
    --success-hover: #059669;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --warning: #f59e0b;
    --warning-hover: #d97706;
    --info: #3b82f6;
    --info-hover: #2563eb;

    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;

    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;

    --border-color: #e5e7eb;
    --border-color-dark: #d1d5db;

    /* Spacing Scale */
    --space-xs: 0.25rem;   /* 4px */
    --space-sm: 0.5rem;    /* 8px */
    --space-md: 1rem;      /* 16px */
    --space-lg: 1.5rem;    /* 24px */
    --space-xl: 2rem;      /* 32px */
    --space-2xl: 3rem;     /* 48px */

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;

    /* 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), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 200ms ease-in-out;
    --transition-slow: 300ms ease-in-out;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
    padding: var(--space-xl) var(--space-md);
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--space-md);
    line-height: 1.7;
}

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

a:hover {
    color: var(--primary-light);
    text-decoration: underline;
}

code {
    font-family: var(--font-mono);
    background-color: var(--bg-tertiary);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    font-size: 0.875em;
    color: var(--text-primary);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-lg) var(--space-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-xl);
}

.site-title {
    font-size: 1.75rem;
    font-weight: 800;
    color: white;
    letter-spacing: -0.025em;
    margin: 0;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-xs);
    align-items: center;
}

.nav-menu li {
    position: relative;
}

.nav-menu a {
    display: flex;
    align-items: center;
    color: rgba(255, 255, 255, 0.9);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.nav-menu a:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    text-decoration: none;
    transform: translateY(-1px);
}

.nav-menu a.active {
    background-color: rgba(255, 255, 255, 0.15);
    color: white;
}

/* Dropdown Menus */
.nav-menu .dropdown {
    position: relative;
}

.nav-menu .dropdown-toggle {
    cursor: pointer;
    gap: var(--space-xs);
}

.nav-menu .dropdown-arrow {
    font-size: 0.75em;
    transition: transform var(--transition-base);
}

.nav-menu .dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

.nav-menu .dropdown-menu {
    position: absolute;
    top: calc(100% + var(--space-sm));
    left: 0;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    min-width: 220px;
    padding: var(--space-sm);
    z-index: 1000;
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
}

.nav-menu .dropdown-menu[style*="display: block"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-menu .dropdown-menu li {
    margin: 0;
}

.nav-menu .dropdown-menu a {
    color: var(--text-primary);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    display: block;
    transition: all var(--transition-fast);
}

.nav-menu .dropdown-menu a:hover {
    background-color: var(--bg-secondary);
    color: var(--primary);
    transform: translateX(4px);
}

/* ==========================================================================
   Container & Layout
   ========================================================================== */
.container,
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

/* ==========================================================================
   Cards
   ========================================================================== */
.card,
.modern-card,
.blog-form-card,
.blog-post-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all var(--transition-base);
}

.card:hover,
.blog-post-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-header {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border-color);
}

.card-header h1,
.card-header h2,
.card-header h3,
.card-header h4,
.card-header h5,
.card-header h6 {
    margin: 0;
    color: var(--text-primary);
    font-weight: 700;
}

.card-body {
    padding: var(--space-xl);
}

.card-footer {
    background: var(--bg-secondary);
    padding: var(--space-lg);
    border-top: 1px solid var(--border-color);
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.9375rem;
    font-weight: 600;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    min-height: 44px;
    white-space: nowrap;
}

.btn:hover {
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

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

/* Primary Button - Dark Blue */
.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border-color: var(--primary);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-hover) 0%, var(--primary-dark) 100%);
    color: white;
}

/* Success Button - Green */
.btn-success {
    background: linear-gradient(135deg, var(--success) 0%, var(--success-hover) 100%);
    color: white;
    border-color: var(--success);
}

.btn-success:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--success-hover) 0%, #047857 100%);
    color: white;
}

/* Danger Button - Red */
.btn-danger {
    background: linear-gradient(135deg, var(--danger) 0%, var(--danger-hover) 100%);
    color: white;
    border-color: var(--danger);
}

.btn-danger:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--danger-hover) 0%, #b91c1c 100%);
    color: white;
}

/* Warning Button - Amber */
.btn-warning {
    background: linear-gradient(135deg, var(--warning) 0%, var(--warning-hover) 100%);
    color: white;
    border-color: var(--warning);
}

.btn-warning:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--warning-hover) 0%, #b45309 100%);
    color: white;
}

/* Info Button - Blue */
.btn-info {
    background: linear-gradient(135deg, var(--info) 0%, var(--info-hover) 100%);
    color: white;
    border-color: var(--info);
}

.btn-info:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--info-hover) 0%, #1d4ed8 100%);
    color: white;
}

/* Secondary Button */
.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-color: var(--border-color-dark);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-tertiary);
    border-color: var(--text-secondary);
    color: var(--text-primary);
}

/* Outline Buttons */
.btn-outline-primary {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}

.btn-outline-primary:hover:not(:disabled) {
    background: var(--primary);
    color: white;
}

.btn-outline-secondary {
    background: transparent;
    color: var(--text-secondary);
    border-color: var(--border-color-dark);
}

.btn-outline-secondary:hover:not(:disabled) {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

.btn-outline-danger {
    background: transparent;
    color: var(--danger);
    border-color: var(--danger);
}

.btn-outline-danger:hover:not(:disabled) {
    background: var(--danger);
    color: white;
}

/* Button Sizes */
.btn-sm {
    padding: var(--space-xs) var(--space-md);
    font-size: 0.875rem;
    min-height: 36px;
}

.btn-lg {
    padding: var(--space-md) var(--space-xl);
    font-size: 1.125rem;
    min-height: 52px;
}

/* Button Group */
.btn-group {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

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

.form-label {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    font-size: 0.9375rem;
}

.form-label .required {
    color: var(--danger);
    margin-left: var(--space-xs);
}

.form-control {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-control:hover:not(:focus) {
    border-color: var(--border-color-dark);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(17, 53, 85, 0.1);
}

.form-control.is-invalid {
    border-color: var(--danger);
}

.form-control.is-invalid: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='%236b7280' 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-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: var(--space-sm);
    line-height: 1.5;
}

.invalid-feedback {
    display: block;
    font-size: 0.875rem;
    color: var(--danger);
    margin-top: var(--space-sm);
    font-weight: 500;
}

.invalid-feedback.d-block {
    display: block !important;
}

/* Checkboxes & Radios */
.form-check {
    display: flex;
    align-items: flex-start;
    padding: var(--space-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.form-check:hover {
    border-color: var(--border-color-dark);
    background-color: var(--bg-secondary);
}

.form-check-input {
    margin: 0.125rem var(--space-md) 0 0;
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--border-color-dark);
    border-radius: var(--radius-sm);
    background-color: var(--bg-primary);
    cursor: pointer;
    flex-shrink: 0;
}

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

.form-check-label {
    flex: 1;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    margin: 0;
}

/* ==========================================================================
   Alerts & Messages
   ========================================================================== */
.alert {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    border: 1px solid transparent;
    font-weight: 500;
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
}

.alert-success {
    background-color: #f0fdf4;
    color: #166534;
    border-color: #bbf7d0;
}

.alert-danger,
.alert-error {
    background-color: #fef2f2;
    color: #991b1b;
    border-color: #fecaca;
}

.alert-warning {
    background-color: #fffbeb;
    color: #92400e;
    border-color: #fed7aa;
}

.alert-info {
    background-color: #eff6ff;
    color: #1e40af;
    border-color: #bfdbfe;
}

/* ==========================================================================
   Tables
   ========================================================================== */
.table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.table thead {
    background: var(--bg-tertiary);
}

.table th {
    padding: var(--space-md) var(--space-lg);
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
}

.table td {
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border-color);
}

.table tbody tr:hover {
    background-color: var(--bg-secondary);
}

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

.table-striped tbody tr:nth-of-type(odd) {
    background-color: var(--bg-secondary);
}

/* ==========================================================================
   Badges
   ========================================================================== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-md);
    font-size: 0.8125rem;
    font-weight: 600;
    line-height: 1;
    border-radius: var(--radius-md);
    white-space: nowrap;
}

.badge.bg-primary { background-color: var(--primary); color: white; }
.badge.bg-success { background-color: var(--success); color: white; }
.badge.bg-danger { background-color: var(--danger); color: white; }
.badge.bg-warning { background-color: var(--warning); color: white; }
.badge.bg-info { background-color: var(--info); color: white; }
.badge.bg-secondary { background-color: var(--text-secondary); color: white; }
.badge.bg-info.text-dark { color: var(--text-primary) !important; }

/* ==========================================================================
   Pagination
   ========================================================================== */
.pagination {
    display: flex;
    list-style: none;
    gap: var(--space-xs);
    justify-content: center;
    margin: var(--space-xl) 0;
}

.pagination .page-item {
    margin: 0;
}

.pagination .page-link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    height: 44px;
    padding: var(--space-sm) var(--space-md);
    color: var(--primary);
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all var(--transition-fast);
}

.pagination .page-link:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

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

.pagination .page-item.disabled .page-link {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* ==========================================================================
   Blog & Content Layouts
   ========================================================================== */
.blog-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-xl);
}

.blog-list-header {
    margin-bottom: var(--space-xl);
}

.blog-list-header h1 {
    margin-bottom: var(--space-lg);
}

.blog-filters {
    background: var(--bg-primary);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--space-xl);
}

.blog-posts {
    display: grid;
    gap: var(--space-xl);
}

.blog-post-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.blog-post-card .card-body {
    padding: var(--space-xl);
}

.blog-post-title {
    font-size: 1.75rem;
    margin-bottom: var(--space-md);
}

.blog-post-title a {
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.blog-post-title a:hover {
    color: var(--primary);
    text-decoration: none;
}

.blog-post-meta {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--space-lg);
}

.blog-post-excerpt {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

.blog-post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.blog-tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.blog-tag:hover {
    background: var(--primary);
    color: white;
    text-decoration: none;
    transform: translateY(-1px);
}

.blog-post-badges {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    align-items: flex-end;
}

.blog-badge {
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    font-weight: 600;
    color: white;
}

.blog-badge.bg-secondary {
    background-color: var(--text-secondary);
}

.blog-badge.bg-warning {
    background-color: var(--warning);
}

.blog-empty-state {
    text-align: center;
    padding: var(--space-2xl) var(--space-xl);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 2px dashed var(--border-color);
}

/* Form Actions */
.blog-form-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: flex-end;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border-color);
    margin-top: var(--space-xl);
}

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

/* Blog Form Row */
.blog-form-row {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
    align-items: start;
}

.blog-form-label {
    padding-top: var(--space-sm);
}

.blog-form-field {
    width: 100%;
}

.blog-form-fields {
    margin-bottom: var(--space-xl);
}

.blog-checkbox-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.blog-checkbox-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.blog-checkbox-item:hover {
    background: var(--bg-tertiary);
}

.blog-checkbox-item input[type="checkbox"] {
    margin-top: 0.125rem;
}

.blog-checkbox-item label {
    font-weight: 500;
    margin: 0;
    cursor: pointer;
}

/* ==========================================================================
   Footer
   ========================================================================== */
footer {
    background: var(--primary);
    color: rgba(255, 255, 255, 0.9);
    padding: var(--space-xl);
    text-align: center;
    margin-top: auto;
}

footer p {
    margin: 0;
    font-size: 0.9375rem;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */
.d-flex {
    display: flex !important;
}

.justify-content-between {
    justify-content: space-between !important;
}

.justify-content-center {
    justify-content: center !important;
}

.align-items-center {
    align-items: center !important;
}

.align-items-start {
    align-items: flex-start !important;
}

.text-center {
    text-align: center !important;
}

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

.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: var(--space-xs) !important; }
.mb-2 { margin-bottom: var(--space-sm) !important; }
.mb-3 { margin-bottom: var(--space-md) !important; }
.mb-4 { margin-bottom: var(--space-lg) !important; }
.mb-5 { margin-bottom: var(--space-xl) !important; }

.mt-2 { margin-top: var(--space-sm) !important; }
.mt-3 { margin-top: var(--space-md) !important; }

.ms-2 { margin-left: var(--space-sm) !important; }
.ms-3 { margin-left: var(--space-md) !important; }

.p-2 { padding: var(--space-sm) !important; }

.w-100 { width: 100% !important; }

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(var(--space-md) * -0.5);
}

.row > * {
    padding: 0 calc(var(--space-md) * 0.5);
}

.col-md-2 { flex: 0 0 16.666667%; max-width: 16.666667%; }
.col-md-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
.col-md-6 { flex: 0 0 50%; max-width: 50%; }
.col-md-8 { flex: 0 0 66.666667%; max-width: 66.666667%; }

.g-3 > * {
    padding: var(--space-md);
}

/* Input Group */
.input-group {
    display: flex;
    width: 100%;
}

.input-group .form-control {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}

.input-group .btn {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

/* Details Summary */
details summary {
    cursor: pointer;
    user-select: none;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

details summary:hover {
    background-color: var(--bg-secondary);
}

details[open] summary {
    margin-bottom: var(--space-md);
}

/* Form Errors */
.form-errors {
    color: var(--danger);
    font-size: 0.875rem;
    margin-top: var(--space-sm);
    font-weight: 500;
}

.error {
    color: var(--danger);
    font-size: 0.875rem;
    margin-top: var(--space-sm);
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 768px) {
    :root {
        --space-xl: 1.5rem;
        --space-2xl: 2rem;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }

    .header-content {
        flex-direction: column;
        gap: var(--space-md);
        padding: var(--space-md);
    }

    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--space-xs);
    }

    .nav-menu a {
        font-size: 0.875rem;
        padding: var(--space-xs) var(--space-md);
    }

    main {
        padding: var(--space-md);
    }

    .container,
    .main-content,
    .blog-container {
        padding: var(--space-md);
    }

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

    .blog-form-row {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .row {
        margin: 0;
    }

    .row > * {
        padding: 0;
    }

    .col-md-2,
    .col-md-4,
    .col-md-6,
    .col-md-8 {
        flex: 0 0 100%;
        max-width: 100%;
        margin-bottom: var(--space-md);
    }

    .btn-group {
        flex-direction: column;
    }

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

    .blog-form-actions {
        flex-direction: column-reverse;
    }

    .blog-form-actions .btn {
        width: 100%;
    }
}

/* ==========================================================================
   Print Styles
   ========================================================================== */
@media print {
    .header,
    .nav-menu,
    footer,
    .btn,
    .blog-form-actions,
    .card-footer {
        display: none !important;
    }

    body {
        background: white;
    }

    .card,
    .blog-post-card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}