/* ============================================
   FILE: assets/css/style.css
   Modern Blog System - Beautiful Minimal Design
   ============================================ */

/* CSS Variables */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #8b5cf6;
    --accent: #ec4899;
    --dark: #0f172a;
    --gray-900: #1e293b;
    --gray-800: #334155;
    --gray-700: #475569;
    --gray-600: #64748b;
    --gray-500: #94a3b8;
    --gray-400: #cbd5e1;
    --gray-300: #e2e8f0;
    --gray-200: #f1f5f9;
    --gray-100: #f8fafc;
    --white: #ffffff;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px rgba(0,0,0,0.07);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 50px rgba(0,0,0,0.15);
    --radius: 12px;
    --radius-lg: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.7;
    color: var(--gray-800);
    background: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.container-small {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow);
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: var(--dark);
    transition: var(--transition);
}

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

.brand-icon {
    font-size: 28px;
    color: var(--primary);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--dark);
    transition: var(--transition);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-item {
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 500;
    font-size: 15px;
    color: var(--gray-700);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-item:hover {
    background: var(--gray-100);
    color: var(--primary);
}

.nav-item.active {
    background: var(--primary);
    color: var(--white);
}

.nav-item .badge {
    background: var(--gray-200);
    color: var(--gray-600);
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 600;
}

.nav-item.active .badge {
    background: rgba(255,255,255,0.2);
    color: var(--white);
}

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

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="2" fill="white" opacity="0.1"/></svg>');
    animation: float 20s linear infinite;
}

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

.hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 20px;
    opacity: 0.9;
    font-weight: 400;
}

.hero-wave {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    overflow: hidden;
    line-height: 0;
}

.hero-wave svg {
    position: relative;
    display: block;
    width: calc(100% + 1.3px);
    height: 60px;
}

.hero-wave path {
    fill: var(--white);
}

/* Animations */
.animate-fade-in {
    animation: fadeIn 0.8s ease-out;
}

.animate-fade-in-delay {
    animation: fadeIn 0.8s ease-out 0.3s both;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Section Header */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.section-header h2 {
    font-size: 32px;
    font-weight: 700;
    color: var(--dark);
}

.link-btn {
    color: var(--primary);
    font-weight: 600;
    transition: var(--transition);
}

.link-btn:hover {
    transform: translateX(4px);
}

/* Featured Section */
.featured-section {
    padding: 60px 0;
    background: var(--gray-100);
}

.featured-post {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 40px;
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.featured-post:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.featured-image {
    height: 400px;
    overflow: hidden;
}

.featured-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.featured-post:hover .featured-image img {
    transform: scale(1.05);
}

.featured-content {
    padding: 40px 40px 40px 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.featured-content h3 {
    font-size: 32px;
    font-weight: 700;
    margin: 16px 0;
    line-height: 1.3;
}

.featured-content h3 a {
    color: var(--dark);
    transition: var(--transition);
}

.featured-content h3 a:hover {
    color: var(--primary);
}

.featured-content p {
    font-size: 18px;
    color: var(--gray-600);
    margin-bottom: 20px;
    line-height: 1.7;
}

/* Posts Section */
.posts-section {
    padding: 80px 0;
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 32px;
}

.post-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.post-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.post-image {
    height: 220px;
    overflow: hidden;
    position: relative;
}

.post-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.image-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.3), transparent);
    opacity: 0;
    transition: var(--transition);
}

.post-card:hover .post-image img {
    transform: scale(1.1);
}

.post-card:hover .image-overlay {
    opacity: 1;
}

.post-body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.post-tag {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 12px;
    width: fit-content;
    transition: var(--transition);
}

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

.post-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.4;
}

.post-title a {
    color: var(--dark);
    transition: var(--transition);
}

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

.post-excerpt {
    color: var(--gray-600);
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: auto;
}

.post-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--gray-200);
}

.post-meta {
    display: flex;
    gap: 8px;
    font-size: 14px;
    color: var(--gray-500);
    align-items: center;
}

.post-stats {
    font-size: 14px;
    color: var(--gray-500);
}

/* Article Page */
.article {
    padding: 40px 0 60px;
}

.article-header {
    text-align: center;
    padding: 60px 0;
}

.article-title {
    font-size: 48px;
    font-weight: 800;
    margin: 20px 0;
    line-height: 1.2;
    color: var(--dark);
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: 12px;
    font-size: 15px;
    color: var(--gray-600);
    flex-wrap: wrap;
}

.article-image {
    margin: 40px 0;
}

.article-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.article-content {
    padding: 40px 0;
}

.content-body {
    font-size: 19px;
    line-height: 1.8;
    color: var(--gray-800);
}

.content-body p {
    margin-bottom: 24px;
}

.content-body h2 {
    font-size: 32px;
    font-weight: 700;
    margin: 48px 0 24px;
    color: var(--dark);
}

.content-body h3 {
    font-size: 24px;
    font-weight: 600;
    margin: 32px 0 16px;
    color: var(--dark);
}

.content-body ul, .content-body ol {
    margin: 24px 0;
    padding-left: 32px;
}

.content-body li {
    margin-bottom: 12px;
}

.content-body img {
    margin: 32px 0;
    border-radius: var(--radius);
}

/* Related Section */
.related-section {
    background: var(--gray-100);
    padding: 80px 0;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 80px 24px;
}

.empty-icon {
    font-size: 80px;
    margin-bottom: 24px;
}

.empty-state h3 {
    font-size: 28px;
    margin-bottom: 12px;
    color: var(--dark);
}

.empty-state p {
    color: var(--gray-600);
    margin-bottom: 32px;
    font-size: 18px;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    margin-top: 60px;
}

.pagination-pages {
    display: flex;
    gap: 8px;
}

.page-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    font-weight: 600;
    color: var(--gray-700);
    background: var(--white);
    border: 1px solid var(--gray-300);
    transition: var(--transition);
}

.page-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    text-align: center;
}

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

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

.btn-outline {
    background: var(--white);
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 14px;
}

.btn-block {
    width: 100%;
}

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

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

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* Footer */
.footer {
    background: var(--dark);
    color: var(--white);
    padding: 60px 0;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
}

.footer-brand .brand-icon {
    color: var(--primary);
}

.footer p {
    opacity: 0.7;
}

/* Admin Styles */
.admin-body {
    background: var(--gray-100);
    display: flex;
}

.admin-sidebar {
    width: 260px;
    background: var(--dark);
    color: var(--white);
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    overflow-y: auto;
    z-index: 1000;
}

.sidebar-brand {
    padding: 32px 24px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 700;
}

.sidebar-nav {
    padding: 16px 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 24px;
    color: rgba(255,255,255,0.7);
    transition: var(--transition);
    font-weight: 500;
}

.nav-link:hover {
    background: rgba(255,255,255,0.1);
    color: var(--white);
}

.nav-link.active {
    background: var(--primary);
    color: var(--white);
    border-left: 4px solid var(--white);
}

.admin-main {
    margin-left: 260px;
    flex: 1;
    min-height: 100vh;
}

.admin-header {
    background: var(--white);
    padding: 24px 32px;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
}

.admin-header h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--dark);
}

.header-actions {
    display: flex;
    gap: 12px;
}

.admin-content {
    padding: 32px;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--white);
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 20px;
    transition: var(--transition);
}

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

.stat-icon {
    font-size: 40px;
}

.stat-info h3 {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.stat-info p {
    color: var(--gray-600);
    font-size: 14px;
}

/* Admin Section */
.admin-section {
    background: var(--white);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
    margin-bottom: 32px;
}

.section-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--gray-200);
}

.section-head h2 {
    font-size: 24px;
    font-weight: 700;
}

/* Table */
.table-wrapper {
    overflow-x: auto;
}

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

.data-table thead {
    background: var(--gray-100);
}

.data-table th {
    padding: 16px;
    text-align: left;
    font-weight: 600;
    color: var(--dark);
    border-bottom: 2px solid var(--gray-300);
}

.data-table td {
    padding: 16px;
    border-bottom: 1px solid var(--gray-200);
}

.data-table tbody tr:hover {
    background: var(--gray-50);
}

.data-table .actions {
    display: flex;
    gap: 12px;
    font-size: 18px;
}

.data-table .actions a {
    cursor: pointer;
    opacity: 0.7;
    transition: var(--transition);
}

.data-table .actions a:hover {
    opacity: 1;
    transform: scale(1.2);
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.badge-published {
    background: #d1fae5;
    color: #065f46;
}

.badge-draft {
    background: #fef3c7;
    color: #92400e;
}

/* Forms */
.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark);
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-300);
    border-radius: 8px;
    font-size: 15px;
    transition: var(--transition);
    font-family: inherit;
}

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

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

.form-group small {
    display: block;
    margin-top: 6px;
    color: var(--gray-600);
    font-size: 13px;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 32px;
}

.form-main {
    min-width: 0;
}

.form-sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.sidebar-box {
    background: var(--gray-50);
    padding: 24px;
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
}

.sidebar-box h3 {
    font-size: 18px;
    margin-bottom: 16px;
    color: var(--dark);
}

.inline-form {
    display: flex;
    gap: 12px;
}

.inline-form .form-control {
    flex: 1;
}

/* Alerts */
.alert {
    padding: 16px 20px;
    border-radius: 8px;
    margin-bottom: 24px;
    font-weight: 500;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border-left: 4px solid #10b981;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border-left: 4px solid #ef4444;
}

/* Login Page */
.login-body {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

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

.login-card {
    background: var(--white);
    padding: 48px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.login-header .brand-icon {
    font-size: 48px;
    color: var(--primary);
}

.login-header h1 {
    font-size: 28px;
    margin: 16px 0 8px;
}

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

.login-form {
    margin-bottom: 24px;
}

.login-footer {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--gray-200);
}

.login-footer a {
    color: var(--primary);
    font-weight: 600;
}

.btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 18px;
    opacity: 0.7;
    transition: var(--transition);
}

.btn-icon:hover {
    opacity: 1;
    transform: scale(1.2);
}

/* Responsive */
@media (max-width: 1024px) {
    .admin-sidebar {
        transform: translateX(-100%);
        transition: var(--transition);
    }
    
    .admin-sidebar.active {
        transform: translateX(0);
    }
    
    .admin-main {
        margin-left: 0;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .mobile-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 16px;
        border-top: 1px solid var(--gray-200);
        box-shadow: var(--shadow-lg);
        max-height: 0;
        overflow: hidden;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        max-height: 500px;
    }
    
    .nav-item {
        width: 100%;
        justify-content: flex-start;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .featured-post {
        grid-template-columns: 1fr;
    }
    
    .featured-content {
        padding: 32px 24px;
    }
    
    .posts-grid {
        grid-template-columns: 1fr;
    }
    
    .article-title {
        font-size: 32px;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
    
    .pagination {
        flex-wrap: wrap;
    }
}