/* Solution Blog System - Modern & Beautiful Styles */

/* CSS Variables for consistent theming */
:root {
    /* Colors */
    --primary: #6366f1;
    --primary-hover: #5855eb;
    --secondary: #f59e0b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #06b6d4;
    
    /* Grays */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Layout */
    --container-max: 1200px;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', 'Monaco', 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition: all 0.2s ease-in-out;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--gray-50);
    font-size: 16px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--gray-900);
}

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; }

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

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

/* Layout Components */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Navigation Bar */
.navbar {
    background: white;
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    color: var(--gray-700);
    font-size: 1rem;
}

.nav-brand:hover {
    color: var(--primary);
}

.nav-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    color: var(--gray-900);
    font-size: 1.1rem;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* Language Toggle Button */
.btn-lang {
    padding: 5px 12px;
    border: 1.5px solid var(--gray-300);
    border-radius: 20px;
    background: white;
    color: var(--gray-600);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    letter-spacing: 0.02em;
}

.btn-lang:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(59, 130, 246, 0.05);
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--gray-600);
    font-size: 0.9rem;
}

/* Button Styles */
.btn-primary, .btn-secondary, .btn-outline, .btn-danger {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.6rem 1.2rem;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

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

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
}

.btn-secondary:hover {
    background: var(--gray-200);
    color: var(--gray-800);
}

.btn-outline {
    background: transparent;
    color: var(--gray-600);
    border: 1px solid var(--gray-300);
}

.btn-outline:hover {
    background: var(--gray-50);
    border-color: var(--gray-400);
    color: var(--gray-700);
}

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

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

.btn-full {
    width: 100%;
    justify-content: center;
}

/* Main Content */
.main-content {
    min-height: calc(100vh - 140px);
    padding: var(--spacing-2xl) 0;
}

/* Hero Section */
.hero-section {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.hero-section h1 {
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-section p {
    color: var(--gray-600);
    font-size: 1.1rem;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.empty-state i {
    font-size: 4rem;
    color: var(--gray-300);
    margin-bottom: var(--spacing-lg);
}

.empty-state h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--gray-600);
}

.empty-state p {
    color: var(--gray-500);
    margin-bottom: var(--spacing-lg);
}

/* Solutions Grid */
.solutions-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* Solution Card */
.solution-card {
    background: white;
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    transition: var(--transition);
    border: 1px solid var(--gray-200);
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.solution-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.card-title-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.card-info-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.card-header {
    flex: 1;
    min-width: 0;
}

.solution-title {
    margin-bottom: 0;
    font-size: 1.05rem;
}

.problem-link-inline {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--info);
    font-size: 0.8rem;
    font-weight: 500;
    white-space: nowrap;
    padding: 0.2rem 0.5rem;
    border-radius: var(--border-radius-sm);
    background: rgba(6, 182, 212, 0.08);
    transition: var(--transition);
}

.problem-link-inline:hover {
    background: rgba(6, 182, 212, 0.15);
    color: #0891b2;
}

.solution-title a {
    color: var(--gray-900);
    font-weight: 600;
}

.solution-title a:hover {
    color: var(--primary);
}

.solution-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xs);
}

.tag {
    background: var(--primary);
    color: white;
    padding: 0.15rem 0.5rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
}

.card-meta {
    display: flex;
    gap: var(--spacing-md);
    color: var(--gray-500);
    font-size: 0.8rem;
    white-space: nowrap;
    margin-left: auto;
}

.card-meta span {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* Solution Post (Individual Blog Page) */
.solution-post {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.post-header {
    padding: var(--spacing-2xl);
    border-bottom: 1px solid var(--gray-200);
    background: linear-gradient(135deg, var(--gray-50), white);
}

.post-title {
    font-size: 2.2rem;
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
}

.post-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    color: var(--gray-600);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.9rem;
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.post-actions {
    margin-top: var(--spacing-lg);
}

.post-actions .btn-secondary {
    cursor: pointer;
}

.post-content {
    padding: var(--spacing-2xl);
    font-size: 1.05rem;
    line-height: 1.8;
}

/* Markdown Content Styling */
#markdown-content h1, #markdown-content h2 {
    margin-top: 2em;
    margin-bottom: 1em;
    padding-bottom: 0.3em;
    border-bottom: 1px solid var(--gray-200);
}

#markdown-content h3, #markdown-content h4 {
    margin-top: 1.5em;
    margin-bottom: 0.8em;
}

#markdown-content p {
    margin-bottom: 1.2em;
}

#markdown-content blockquote {
    border-left: 4px solid var(--primary);
    padding-left: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    background: var(--gray-50);
    padding: var(--spacing-lg);
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
}

#markdown-content code {
    background: var(--gray-100);
    padding: 0.2em 0.4em;
    border-radius: var(--border-radius-sm);
    font-family: var(--font-mono);
    font-size: 0.9em;
}

#markdown-content pre {
    background: var(--gray-900);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: var(--spacing-lg) 0;
    position: relative;
}

.copy-btn {
    position: absolute;
    right: 8px;
    padding: 4px 8px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    color: var(--gray-400);
    cursor: pointer;
    font-size: 0.8rem;
    opacity: 0;
    transition: opacity 0.2s, background 0.2s;
    z-index: 1;
}

.copy-btn-top {
    top: 8px;
}

.copy-btn-bottom {
    bottom: 8px;
}

#markdown-content pre:hover .copy-btn {
    opacity: 1;
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.copy-btn.copied {
    color: var(--success);
    border-color: var(--success);
}

#markdown-content pre code {
    background: none;
    padding: 0;
    color: var(--gray-100);
}

#markdown-content table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-lg) 0;
}

#markdown-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius-sm);
    margin: var(--spacing-md) 0;
    box-shadow: var(--shadow-sm);
}

#markdown-content video,
#preview-area video {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius-sm);
    margin: var(--spacing-md) 0;
    box-shadow: var(--shadow-sm);
}

#preview-area img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius-sm);
    margin: var(--spacing-md) 0;
    box-shadow: var(--shadow-sm);
}

#markdown-content th,
#markdown-content td {
    border: 1px solid var(--gray-200);
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
}

#markdown-content th {
    background: var(--gray-50);
    font-weight: 600;
}

/* Login Page */
.login-page {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.login-container {
    position: relative;
    z-index: 10;
    width: 100%;
    max-width: 400px;
    margin: var(--spacing-lg);
}

.login-card {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-2xl);
    backdrop-filter: blur(10px);
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.login-icon {
    display: inline-block;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
}

.login-icon i {
    font-size: 1.5rem;
    color: white;
}

.login-header h1 {
    margin-bottom: var(--spacing-sm);
    color: var(--gray-900);
}

.login-header p {
    color: var(--gray-600);
}

.error-message {
    background: #fee2e2;
    color: #dc2626;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.login-form {
    margin-bottom: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--gray-700);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    transition: var(--transition);
    background: white;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.login-footer {
    text-align: center;
}

.back-link {
    color: var(--gray-600);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.back-link:hover {
    color: var(--primary);
}

/* Login Background Animation */
.login-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.bg-shapes {
    position: relative;
    width: 100%;
    height: 100%;
}

.shape {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    animation: float 6s ease-in-out infinite;
}

.shape-1 {
    width: 80px;
    height: 80px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 120px;
    height: 120px;
    top: 70%;
    right: 15%;
    animation-delay: 2s;
}

.shape-3 {
    width: 60px;
    height: 60px;
    top: 40%;
    right: 30%;
    animation-delay: 4s;
}

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

/* Admin Panel */
.admin-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--spacing-2xl);
    align-items: start;
}

.admin-main {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-2xl);
}

.admin-sidebar {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-xl);
}

.sidebar-section {
    margin-bottom: var(--spacing-2xl);
}

.sidebar-section h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    color: var(--gray-800);
    font-size: 1.1rem;
}

.solution-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.solution-item {
    padding: var(--spacing-md);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.solution-item:hover {
    border-color: var(--primary);
    background: var(--gray-50);
}

.solution-item.active {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

.solution-item h4 {
    margin-bottom: var(--spacing-xs);
    font-size: 0.95rem;
}

.solution-item h4 a {
    color: var(--gray-800);
}

.solution-item h4 a:hover {
    color: var(--primary);
}

.solution-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
}

.status {
    padding: 0.2rem 0.5rem;
    border-radius: 12px;
    font-weight: 500;
}

.status-published {
    background: #dcfce7;
    color: #15803d;
}

.status-draft {
    background: #fef3c7;
    color: #d97706;
}

.status-personal {
    background: #e0e7ff;
    color: #4338ca;
}

.date {
    color: var(--gray-500);
}

.help-content {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.8;
    color: var(--gray-600);
}

/* Form Enhancements */
.solution-form {
    max-width: none;
}

.form-row {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.form-group-half {
    flex: 1;
}

.form-group small {
    color: var(--gray-500);
    font-size: 0.85rem;
    margin-top: var(--spacing-xs);
    display: block;
}

.form-group textarea {
    resize: vertical;
    min-height: 300px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* Editor Container */
.editor-container {
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
}

.editor-tabs {
    display: flex;
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-300);
    align-items: center;
}

.editor-toolbar-right {
    margin-left: auto;
    padding-right: var(--spacing-md);
}

.btn-upload {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.4rem 0.9rem;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    font-size: 0.85rem;
    border: 1px solid var(--gray-300);
    cursor: pointer;
    transition: var(--transition);
    background: white;
    color: var(--gray-600);
}

.btn-upload:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

.btn-upload:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Drag-over state for textarea */
.form-group textarea.drag-over {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
    background: rgba(99, 102, 241, 0.03);
}

.tab-btn {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    color: var(--gray-600);
    transition: var(--transition);
}

.tab-btn:hover {
    background: var(--gray-100);
    color: var(--gray-800);
}

.tab-btn.active {
    background: white;
    color: var(--primary);
    border-bottom: 2px solid var(--primary);
}

.tab-content {
    position: relative;
}

.tab-pane {
    display: none;
    padding: var(--spacing-lg);
}

.tab-pane.active {
    display: block;
}

.editor-help {
    margin-top: var(--spacing-sm);
}

.preview-content {
    min-height: 300px;
    background: white;
}

#preview-area {
    font-size: 1.05rem;
    line-height: 1.8;
}

.empty-text {
    color: var(--gray-500);
    font-style: italic;
}

/* Form Actions */
.form-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--gray-200);
}

.action-group {
    display: flex;
    gap: var(--spacing-md);
}

.danger-zone {
    display: flex;
    align-items: center;
}

/* Alert Messages */
.alert {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.alert-error {
    background: #fee2e2;
    color: #dc2626;
    border: 1px solid #fecaca;
}

.alert-success {
    background: #dcfce7;
    color: #15803d;
    border: 1px solid #bbf7d0;
}

/* Search Box */
.search-box {
    margin-bottom: var(--spacing-xl);
}

.search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #667eea0a, #764ba20a);
    border-radius: 50px;
    padding: 4px;
    border: 1.5px solid var(--gray-200);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.search-input-wrapper:focus-within {
    border-color: transparent;
    background: linear-gradient(135deg, #667eea22, #764ba222);
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.15), 0 0 0 3px rgba(102, 126, 234, 0.08);
    transform: translateY(-1px);
}

.search-icon {
    position: absolute;
    left: 20px;
    color: var(--gray-400);
    font-size: 1rem;
    transition: color 0.3s;
}

.search-input-wrapper:focus-within .search-icon {
    color: #667eea;
}

#searchInput {
    width: 100%;
    padding: 14px 48px;
    font-size: 1rem;
    border: none;
    border-radius: 46px;
    background: white;
    transition: background 0.3s;
    font-family: inherit;
    letter-spacing: 0.01em;
}

#searchInput:focus {
    outline: none;
    background: #fefefe;
}

#searchInput::placeholder {
    color: var(--gray-400);
    font-weight: 300;
}

.search-clear {
    position: absolute;
    right: 16px;
    background: var(--gray-100);
    border: none;
    color: var(--gray-500);
    cursor: pointer;
    padding: 6px 10px;
    font-size: 0.85rem;
    border-radius: 50%;
    transition: all 0.2s;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-clear:hover {
    color: white;
    background: #667eea;
    transform: rotate(90deg);
}

/* Tag Filter */
.tag-filter {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-lg) var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    border: 1px solid var(--gray-200);
}

.filter-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    color: var(--gray-700);
    font-weight: 500;
}

.filter-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.filter-tag {
    padding: 0.4rem 0.9rem;
    border-radius: 20px;
    border: 1px solid var(--gray-300);
    background: white;
    color: var(--gray-600);
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.filter-tag:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

.filter-tag.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Problem Link */
.problem-link {
    margin-top: var(--spacing-sm);
}

.problem-link a {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--info);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.3rem 0.7rem;
    border-radius: var(--border-radius-sm);
    background: rgba(6, 182, 212, 0.08);
    transition: var(--transition);
}

.problem-link a:hover {
    background: rgba(6, 182, 212, 0.15);
    color: #0891b2;
}

.problem-link-banner {
    margin: var(--spacing-md) 0;
}

.problem-link-banner a {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: white;
    background: linear-gradient(135deg, var(--info), #0284c7);
    padding: 0.6rem 1.2rem;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
}

.problem-link-banner a:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    color: white;
}

/* Footer */
.footer {
    background: var(--gray-800);
    color: var(--gray-300);
    padding: var(--spacing-xl) 0;
    text-align: center;
    margin-top: var(--spacing-2xl);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .nav-container {
        padding: 0 var(--spacing-md);
    }
    
    .nav-title {
        display: none;
    }
    
    .solutions-grid {
        gap: var(--spacing-sm);
    }
    
    .solution-card {
        padding: var(--spacing-md);
    }
    
    .card-title-row {
        flex-wrap: wrap;
    }
    
    .card-info-row {
        flex-wrap: wrap;
    }
    
    .card-meta {
        margin-left: 0;
    }
    
    .post-header,
    .post-content {
        padding: var(--spacing-lg);
    }
    
    .post-title {
        font-size: 1.8rem;
    }
    
    .post-meta {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .admin-layout {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .form-row {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .form-actions {
        flex-direction: column;
        gap: var(--spacing-lg);
        align-items: stretch;
    }
    
    .action-group {
        justify-content: center;
    }
    
    .danger-zone {
        justify-content: center;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.6rem; }
}

@media (max-width: 480px) {
    .nav-actions {
        gap: var(--spacing-sm);
    }
    
    .btn-primary, .btn-secondary, .btn-outline, .btn-danger {
        padding: 0.5rem 0.8rem;
        font-size: 0.85rem;
    }
    
    .login-card {
        margin: var(--spacing-sm);
        padding: var(--spacing-lg);
    }
    
    .solution-card {
        padding: var(--spacing-md);
    }
    
    .card-meta {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}