/* ====================================
   EduNews - School News Website
   Main Stylesheet
==================================== */

:root {
    /* Education Theme Colors */
    --primary: #1e40af;
    --primary-light: #3b82f6;
    --primary-dark: #1e3a8a;
    --secondary: #059669;
    --secondary-light: #10b981;
    --accent: #f59e0b;
    --accent-light: #fbbf24;
    
    /* Neutrals */
    --white: #ffffff;
    --light: #f8fafc;
    --lighter: #f1f5f9;
    --gray-lighter: #e2e8f0;
    --gray-light: #cbd5e1;
    --gray: #64748b;
    --gray-dark: #475569;
    --dark: #1e293b;
    --darker: #0f172a;
    
    /* Semantic */
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Layout */
    --header-height: 60px;
    --header-top-height: 40px;
    --radius-sm: 6px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
}

/* Dark Mode */
[data-theme="dark"] {
    --white: #0f172a;
    --light: #1e293b;
    --lighter: #334155;
    --gray-lighter: #475569;
    --gray-light: #64748b;
    --gray: #94a3b8;
    --gray-dark: #cbd5e1;
    --dark: #f1f5f9;
    --darker: #f8fafc;
}

/* ====================================
   Reset & Base
==================================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: 'Open Sans', sans-serif; background: var(--light); color: var(--dark); line-height: 1.6; overflow-x: hidden; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; font-size: inherit; }

h1, h2, h3, h4, h5, h6 { font-family: 'Montserrat', sans-serif; font-weight: 700; line-height: 1.3; color: var(--darker); }
h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }

/* ====================================
   Header
==================================== */
.header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; transition: var(--transition); }

.header-top { background: var(--primary-dark); color: var(--white); padding: 8px 0; font-size: 0.85rem; }
.header-top .container { display: flex; justify-content: space-between; align-items: center; }
.header-top-left { display: flex; gap: 25px; }
.header-top-left span { display: flex; align-items: center; gap: 8px; }
.header-top-right { display: flex; gap: 15px; }
.header-top-right a { color: var(--white); opacity: 0.8; transition: var(--transition); }
.header-top-right a:hover { opacity: 1; }

.header-main { background: var(--white); padding: 12px 0; box-shadow: var(--shadow); }
.header-main .container { display: flex; align-items: center; justify-content: space-between; gap: 40px; }

.header.scrolled { box-shadow: var(--shadow-lg); }
.header.scrolled .header-top { display: none; }

.logo { display: flex; align-items: center; gap: 12px; }
.logo i { font-size: 2rem; color: var(--primary); }
.logo-text { display: flex; flex-direction: column; }
.logo-name { font-family: 'Montserrat', sans-serif; font-weight: 800; font-size: 1.4rem; color: var(--primary); }
.logo-name strong { color: var(--secondary); }
.logo-slogan { font-size: 0.7rem; color: var(--gray); text-transform: uppercase; letter-spacing: 1px; }

/* Navigation */
.nav-list { display: flex; align-items: center; gap: 5px; }
.nav-link { display: flex; align-items: center; gap: 8px; padding: 12px 18px; border-radius: var(--radius); font-weight: 500; color: var(--gray-dark); transition: var(--transition); }
.nav-link i { font-size: 0.9rem; }
.nav-link:hover, .nav-link.active { color: var(--primary); background: rgba(30, 64, 175, 0.08); }
.dropdown-icon { font-size: 0.7rem; margin-left: 5px; transition: var(--transition); }

.dropdown { position: relative; }
.dropdown-menu { position: absolute; top: 100%; left: 0; min-width: 220px; background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow-lg); opacity: 0; visibility: hidden; transform: translateY(10px); transition: var(--transition); padding: 10px; }
.dropdown:hover .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown:hover .dropdown-icon { transform: rotate(180deg); }
.dropdown-menu li a { display: flex; align-items: center; gap: 10px; padding: 12px 15px; border-radius: var(--radius-sm); color: var(--gray-dark); }
.dropdown-menu li a:hover { background: var(--light); color: var(--primary); }
.dropdown-menu li a i { width: 20px; color: var(--primary); }

/* Header Actions */
.header-actions { display: flex; align-items: center; gap: 10px; }
.search-btn, .theme-toggle { width: 44px; height: 44px; border-radius: var(--radius); display: flex; align-items: center; justify-content: center; color: var(--gray-dark); background: var(--light); transition: var(--transition); }
.search-btn:hover, .theme-toggle:hover { background: var(--primary); color: var(--white); }

.mobile-menu-btn { display: none; flex-direction: column; gap: 5px; padding: 10px; }
.mobile-menu-btn span { width: 24px; height: 2px; background: var(--dark); transition: var(--transition); }

/* Search Modal */
.search-modal { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0, 0, 0, 0.9); z-index: 2000; display: flex; align-items: center; justify-content: center; opacity: 0; visibility: hidden; transition: var(--transition); }
.search-modal.active { opacity: 1; visibility: visible; }
.search-modal-content { width: 90%; max-width: 600px; position: relative; }
.search-input { width: 100%; padding: 20px 60px 20px 25px; font-size: 1.2rem; border: none; border-radius: var(--radius-xl); background: var(--white); }
.search-close { position: absolute; right: 20px; top: 50%; transform: translateY(-50%); color: var(--gray); font-size: 1.5rem; }

/* ====================================
   Hero Section
==================================== */
.hero { position: relative; height: 75vh; min-height: 550px; overflow: hidden; margin-top: calc(var(--header-height) + var(--header-top-height)); }
.hero-slide { position: absolute; inset: 0; background-size: cover; background-position: center; opacity: 0; transition: opacity 0.8s ease; }
.hero-slide::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(30, 64, 175, 0.85) 0%, rgba(5, 150, 105, 0.7) 100%); }
.hero-slide.active { opacity: 1; }
.hero-content { position: absolute; top: 50%; left: 10%; transform: translateY(-50%); max-width: 650px; color: var(--white); z-index: 10; }
.hero-tag { display: inline-flex; align-items: center; gap: 8px; padding: 8px 16px; background: rgba(255, 255, 255, 0.2); backdrop-filter: blur(10px); border-radius: var(--radius-full); font-size: 0.85rem; font-weight: 600; margin-bottom: 20px; }
.hero-title { font-size: 3rem; margin-bottom: 20px; text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2); }
.hero-desc { font-size: 1.1rem; opacity: 0.9; margin-bottom: 30px; line-height: 1.7; }

/* Hero Navigation */
.hero-nav { position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%); display: flex; align-items: center; gap: 20px; z-index: 20; }
.hero-nav-btn { width: 50px; height: 50px; border-radius: 50%; background: rgba(255, 255, 255, 0.2); backdrop-filter: blur(10px); color: var(--white); display: flex; align-items: center; justify-content: center; transition: var(--transition); }
.hero-nav-btn:hover { background: var(--white); color: var(--primary); }
.hero-dots { display: flex; gap: 10px; }
.hero-dot { width: 12px; height: 12px; border-radius: 50%; background: rgba(255, 255, 255, 0.4); cursor: pointer; transition: var(--transition); }
.hero-dot.active { background: var(--white); transform: scale(1.3); }

/* ====================================
   Quick Links
==================================== */
.quick-links { padding: 60px 0; background: var(--white); margin-top: -60px; position: relative; z-index: 30; border-radius: var(--radius-xl) var(--radius-xl) 0 0; }
.quick-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 25px; }
.quick-card { background: var(--light); padding: 30px; border-radius: var(--radius-lg); text-align: center; transition: var(--transition); border: 2px solid transparent; }
.quick-card:hover { border-color: var(--primary); transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.quick-icon { width: 70px; height: 70px; margin: 0 auto 20px; border-radius: var(--radius); background: linear-gradient(135deg, var(--primary), var(--secondary)); display: flex; align-items: center; justify-content: center; }
.quick-icon i { font-size: 1.8rem; color: var(--white); }
.quick-card h3 { font-size: 1.1rem; margin-bottom: 8px; color: var(--dark); }
.quick-card p { font-size: 0.9rem; color: var(--gray); }

/* ====================================
   Sections
==================================== */
.section { padding: 60px 0; }
.section-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 35px; }
.section-title { font-size: 1.6rem; display: flex; align-items: center; gap: 12px; }
.section-title i { color: var(--primary); }
.section-link { display: flex; align-items: center; gap: 8px; color: var(--primary); font-weight: 600; }
.section-link:hover { color: var(--secondary); }

/* ====================================
   News Grid & Cards
==================================== */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.news-list-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 25px; }

.news-card { background: var(--white); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow); transition: var(--transition); }
.news-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-xl); }
.news-card .card-image { position: relative; height: 200px; overflow: hidden; }
.news-card .card-image img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
.news-card:hover .card-image img { transform: scale(1.1); }
.news-card .card-category { position: absolute; top: 15px; left: 15px; padding: 6px 14px; background: var(--primary); color: var(--white); border-radius: var(--radius-full); font-size: 0.75rem; font-weight: 600; }
.news-card .card-priority { position: absolute; top: 15px; right: 15px; width: 30px; height: 30px; background: var(--accent); color: var(--white); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 0.8rem; }
.news-card .card-body { padding: 25px; }
.news-card .card-title { font-size: 1.15rem; margin-bottom: 12px; line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-card .card-excerpt { color: var(--gray); font-size: 0.9rem; margin-bottom: 15px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-card .card-meta { display: flex; gap: 15px; font-size: 0.8rem; color: var(--gray); }
.news-card .card-meta span { display: flex; align-items: center; gap: 5px; }

/* ====================================
   Dual Column Section
==================================== */
.dual-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.dual-column { background: var(--white); border-radius: var(--radius-lg); padding: 30px; box-shadow: var(--shadow); }

/* Announcement List */
.announcement-list { display: flex; flex-direction: column; gap: 15px; }
.announcement-item { display: flex; gap: 15px; padding: 15px; border-radius: var(--radius); background: var(--light); transition: var(--transition); }
.announcement-item:hover { background: rgba(30, 64, 175, 0.08); }
.announcement-item .date { min-width: 55px; text-align: center; padding: 10px 5px; background: var(--primary); color: var(--white); border-radius: var(--radius-sm); }
.announcement-item .date .day { font-size: 1.4rem; font-weight: 700; display: block; }
.announcement-item .date .month { font-size: 0.7rem; text-transform: uppercase; }
.announcement-item .content h4 { font-size: 0.95rem; margin-bottom: 5px; }
.announcement-item .content p { font-size: 0.85rem; color: var(--gray); }

/* Events List */
.events-list { display: flex; flex-direction: column; gap: 15px; }
.event-item { display: flex; gap: 15px; padding: 15px; border-radius: var(--radius); background: var(--light); border-left: 4px solid var(--secondary); transition: var(--transition); }
.event-item:hover { background: rgba(5, 150, 105, 0.08); }
.event-item .event-icon { width: 50px; height: 50px; background: var(--secondary); color: var(--white); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-size: 1.2rem; }
.event-item .event-info h4 { font-size: 0.95rem; margin-bottom: 5px; }
.event-item .event-info p { font-size: 0.85rem; color: var(--gray); display: flex; align-items: center; gap: 5px; }

/* ====================================
   Stats Section
==================================== */
.stats-section { background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%); padding: 80px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; }
.stat-item { text-align: center; color: var(--white); }
.stat-number { font-family: 'Montserrat', sans-serif; font-size: 3.5rem; font-weight: 800; margin-bottom: 10px; }
.stat-label { font-size: 1.1rem; opacity: 0.9; }

/* ====================================
   Page Banner
==================================== */
.page-banner { position: relative; height: 350px; margin-top: calc(var(--header-height) + var(--header-top-height)); background-size: cover; background-position: center; display: flex; align-items: center; }
.page-banner-overlay { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(30, 64, 175, 0.9) 0%, rgba(5, 150, 105, 0.8) 100%); }
.page-banner-content { position: relative; z-index: 10; color: var(--white); text-align: center; width: 100%; }
.page-title { font-size: 2.5rem; margin-bottom: 15px; display: flex; align-items: center; justify-content: center; gap: 15px; }
.page-subtitle { font-size: 1.1rem; opacity: 0.9; }

/* Breadcrumb */
.breadcrumb { display: flex; align-items: center; justify-content: center; gap: 10px; margin-bottom: 20px; font-size: 0.9rem; }
.breadcrumb a { color: rgba(255, 255, 255, 0.8); }
.breadcrumb a:hover { color: var(--white); }

/* ====================================
   Category Tabs
==================================== */
.category-tabs { background: var(--white); padding: 30px 0; box-shadow: var(--shadow); }
.tabs-grid { display: flex; justify-content: center; gap: 15px; flex-wrap: wrap; }
.tab-card { display: flex; align-items: center; gap: 10px; padding: 15px 25px; background: var(--light); border-radius: var(--radius-full); font-weight: 600; color: var(--gray-dark); transition: var(--transition); border: 2px solid transparent; }
.tab-card:hover { border-color: var(--primary); }
.tab-card.active { background: var(--primary); color: var(--white); }
.tab-card i { font-size: 1rem; }

/* ====================================
   Page Layout
==================================== */
.page-layout { display: grid; grid-template-columns: 280px 1fr; gap: 40px; padding: 50px 0; }

/* Sidebar */
.sidebar { display: flex; flex-direction: column; gap: 25px; }
.sidebar-card { background: var(--white); border-radius: var(--radius-lg); padding: 25px; box-shadow: var(--shadow); }
.sidebar-card h3 { font-size: 1.1rem; margin-bottom: 20px; display: flex; align-items: center; gap: 10px; color: var(--primary); }

/* Hot Articles */
.hot-item { display: flex; gap: 10px; padding: 12px 0; border-bottom: 1px solid var(--gray-lighter); }
.hot-item:last-child { border-bottom: none; }
.hot-number { width: 28px; height: 28px; background: var(--primary); color: var(--white); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 0.8rem; font-weight: 700; flex-shrink: 0; }
.hot-item h4 { font-size: 0.9rem; font-weight: 500; line-height: 1.4; }
.hot-item:hover h4 { color: var(--primary); }

/* Tags Cloud */
.tags-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag { padding: 6px 12px; background: var(--light); border-radius: var(--radius-full); font-size: 0.8rem; color: var(--gray-dark); }
.tag:hover { background: var(--primary); color: var(--white); }

/* Content Area */
.content-area { min-width: 0; }
.content-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 25px; }
.results-count { font-size: 0.9rem; color: var(--gray); }
.sort-options select { padding: 10px 15px; border: 1px solid var(--gray-lighter); border-radius: var(--radius); background: var(--white); }

/* ====================================
   Programs Grid
==================================== */
.programs-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 25px; }
.program-card { background: var(--white); border-radius: var(--radius-lg); padding: 35px 25px; text-align: center; box-shadow: var(--shadow); transition: var(--transition); border: 2px solid transparent; }
.program-card:hover { border-color: var(--primary); transform: translateY(-5px); }
.program-icon { width: 80px; height: 80px; margin: 0 auto 20px; background: linear-gradient(135deg, var(--primary), var(--secondary)); border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center; }
.program-icon i { font-size: 2rem; color: var(--white); }
.program-card h3 { font-size: 1.15rem; margin-bottom: 12px; }
.program-card p { font-size: 0.9rem; color: var(--gray); margin-bottom: 20px; }
.program-info { display: flex; justify-content: center; gap: 20px; margin-bottom: 20px; font-size: 0.85rem; color: var(--gray); }
.program-info li { display: flex; align-items: center; gap: 5px; }

/* ====================================
   Research Areas
==================================== */
.research-areas-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 25px; margin-bottom: 50px; }
.research-area-card { background: var(--white); border-radius: var(--radius-lg); padding: 30px; box-shadow: var(--shadow); transition: var(--transition); }
.research-area-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.area-icon { width: 60px; height: 60px; background: linear-gradient(135deg, var(--primary), var(--primary-light)); border-radius: var(--radius); display: flex; align-items: center; justify-content: center; margin-bottom: 20px; }
.area-icon i { font-size: 1.5rem; color: var(--white); }
.research-area-card h3 { font-size: 1.1rem; margin-bottom: 10px; }
.research-area-card p { font-size: 0.9rem; color: var(--gray); margin-bottom: 15px; }
.area-stats { display: flex; gap: 15px; font-size: 0.8rem; color: var(--gray); }
.area-stats span { display: flex; align-items: center; gap: 5px; }

/* Publications List */
.publications-list { background: var(--white); border-radius: var(--radius-lg); padding: 30px; box-shadow: var(--shadow); }
.publication-item { display: flex; align-items: flex-start; gap: 20px; padding: 20px 0; border-bottom: 1px solid var(--gray-lighter); }
.publication-item:last-child { border-bottom: none; }
.pub-year { background: var(--primary); color: var(--white); padding: 8px 15px; border-radius: var(--radius-sm); font-weight: 700; font-size: 0.9rem; }
.pub-content { flex: 1; }
.pub-content h4 { font-size: 1rem; margin-bottom: 8px; }
.pub-authors { font-size: 0.9rem; color: var(--gray-dark); margin-bottom: 5px; }
.pub-journal { font-size: 0.85rem; color: var(--gray); display: flex; align-items: center; gap: 8px; }
.pub-type { background: var(--secondary); color: var(--white); padding: 5px 12px; border-radius: var(--radius-full); font-size: 0.75rem; font-weight: 600; }

/* ====================================
   Article Detail
==================================== */
.article-header { background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%); padding: 100px 0 80px; margin-top: calc(var(--header-height) + var(--header-top-height)); color: var(--white); text-align: center; }
.article-category { display: inline-flex; align-items: center; gap: 8px; padding: 8px 16px; background: rgba(255, 255, 255, 0.2); border-radius: var(--radius-full); font-size: 0.85rem; margin-bottom: 20px; }
.article-title { font-size: 2.2rem; max-width: 900px; margin: 0 auto 20px; }
.article-excerpt { font-size: 1.1rem; opacity: 0.9; max-width: 700px; margin: 0 auto 25px; }
.article-meta { display: flex; justify-content: center; gap: 25px; font-size: 0.9rem; opacity: 0.85; }
.article-meta span { display: flex; align-items: center; gap: 8px; }

.article-main { padding: 60px 0; }
.article-layout { display: grid; grid-template-columns: 1fr 320px; gap: 40px; margin-bottom: 50px; }
.article-body { background: var(--white); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow); }
.article-featured-image { position: relative; height: 400px; }
.article-featured-image img { width: 100%; height: 100%; object-fit: cover; }
.image-overlay { position: absolute; bottom: 20px; right: 20px; padding: 10px 20px; background: rgba(0, 0, 0, 0.7); color: var(--white); border-radius: var(--radius); display: flex; align-items: center; gap: 8px; cursor: pointer; transition: var(--transition); }
.image-overlay:hover { background: var(--primary); }
.article-content { padding: 40px; font-size: 1.05rem; line-height: 1.8; }
.article-content h2 { margin: 30px 0 15px; font-size: 1.5rem; }
.article-content p { margin-bottom: 20px; }
.article-tags { padding: 0 40px 30px; display: flex; flex-wrap: wrap; gap: 10px; }
.article-share { padding: 20px 40px; border-top: 1px solid var(--gray-lighter); display: flex; align-items: center; gap: 15px; }
.share-btn { width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center; transition: var(--transition); }
.share-btn.facebook { background: #1877f2; color: var(--white); }
.share-btn.twitter { background: #1da1f2; color: var(--white); }
.share-btn.linkedin { background: #0a66c2; color: var(--white); }
.share-btn.copy { background: var(--light); color: var(--gray-dark); }
.share-btn:hover { opacity: 0.85; transform: scale(1.1); }

/* Article Sidebar */
.article-sidebar { display: flex; flex-direction: column; gap: 25px; }
.related-articles, .popular-articles { display: flex; flex-direction: column; gap: 15px; }
.related-item, .popular-item { display: flex; gap: 12px; padding: 10px; border-radius: var(--radius); transition: var(--transition); }
.related-item:hover, .popular-item:hover { background: var(--light); }
.related-item img, .popular-item img { width: 80px; height: 60px; object-fit: cover; border-radius: var(--radius-sm); }
.related-item h4, .popular-item h4 { font-size: 0.9rem; font-weight: 500; line-height: 1.4; }

/* Comments */
.comments-section { background: var(--white); border-radius: var(--radius-lg); padding: 40px; box-shadow: var(--shadow); }
.comments-section h3 { font-size: 1.3rem; margin-bottom: 30px; display: flex; align-items: center; gap: 10px; }
.comment-form { margin-bottom: 40px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; }
.comment-form input, .comment-form textarea { width: 100%; padding: 15px; border: 1px solid var(--gray-lighter); border-radius: var(--radius); transition: var(--transition); }
.comment-form input:focus, .comment-form textarea:focus { outline: none; border-color: var(--primary); }
.comment-form textarea { margin-bottom: 20px; resize: vertical; }
.comments-list { display: flex; flex-direction: column; gap: 25px; }
.comment-item { display: flex; gap: 15px; padding-bottom: 25px; border-bottom: 1px solid var(--gray-lighter); }
.comment-item:last-child { border-bottom: none; }
.comment-avatar { width: 50px; height: 50px; background: var(--primary); color: var(--white); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 1.2rem; }
.comment-content h4 { font-size: 1rem; margin-bottom: 5px; }
.comment-date { font-size: 0.8rem; color: var(--gray); margin-bottom: 10px; display: block; }
.comment-content p { font-size: 0.95rem; color: var(--gray-dark); }

/* ====================================
   Buttons
==================================== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 14px 28px; border-radius: var(--radius); font-weight: 600; font-size: 0.95rem; transition: var(--transition); cursor: pointer; border: 2px solid transparent; }
.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-secondary { background: var(--secondary); color: var(--white); }
.btn-secondary:hover { background: #047857; }
.btn-outline { background: transparent; border-color: var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: var(--white); }
.btn-danger { background: var(--danger); color: var(--white); }
.btn-danger:hover { background: #dc2626; }

/* ====================================
   Admin Styles
==================================== */
.admin-body { background: var(--lighter); }
.admin-header { position: relative; }
.admin-header .header-top { display: none; }
.admin-main { padding: 40px 0; margin-top: var(--header-height); }
.admin-header-section { margin-bottom: 30px; }
.admin-title { font-size: 1.8rem; display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.admin-subtitle { color: var(--gray); }

/* Admin Stats */
.admin-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 30px; }
.stat-card { background: var(--white); border-radius: var(--radius-lg); padding: 25px; display: flex; align-items: center; gap: 20px; box-shadow: var(--shadow); }
.stat-icon { width: 60px; height: 60px; border-radius: var(--radius); display: flex; align-items: center; justify-content: center; font-size: 1.5rem; color: var(--white); }
.stat-icon.thong-bao { background: linear-gradient(135deg, #f59e0b, #fbbf24); }
.stat-icon.su-kien { background: linear-gradient(135deg, #8b5cf6, #a78bfa); }
.stat-icon.hoc-bong { background: linear-gradient(135deg, #10b981, #34d399); }
.stat-icon.total { background: linear-gradient(135deg, #3b82f6, #60a5fa); }
.stat-info .stat-number { font-size: 1.8rem; font-weight: 700; color: var(--dark); }
.stat-info .stat-label { font-size: 0.9rem; color: var(--gray); }

/* Admin Layout */
.admin-layout { display: grid; grid-template-columns: 1fr 1.2fr; gap: 30px; }
.admin-card { background: var(--white); border-radius: var(--radius-lg); box-shadow: var(--shadow); overflow: hidden; }
.admin-card-header { padding: 20px 25px; border-bottom: 1px solid var(--gray-lighter); display: flex; justify-content: space-between; align-items: center; }
.admin-card-header h2 { font-size: 1.2rem; display: flex; align-items: center; gap: 10px; }

/* Article Form */
.article-form { padding: 25px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; font-weight: 500; color: var(--gray-dark); font-size: 0.9rem; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 12px 15px; border: 1px solid var(--gray-lighter); border-radius: var(--radius); transition: var(--transition); background: var(--white); }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.image-preview { margin-top: 10px; }
.image-preview img { max-height: 150px; border-radius: var(--radius); }
.form-actions { display: flex; gap: 15px; padding-top: 10px; }

/* Filter Tabs */
.filter-tabs { display: flex; gap: 8px; }
.filter-tab { padding: 8px 16px; border-radius: var(--radius-full); font-size: 0.85rem; font-weight: 500; color: var(--gray); background: var(--light); transition: var(--transition); }
.filter-tab:hover { background: var(--gray-lighter); }
.filter-tab.active { background: var(--primary); color: var(--white); }

/* Articles List */
.articles-list { max-height: 600px; overflow-y: auto; }
.list-item { display: flex; gap: 15px; padding: 20px; border-bottom: 1px solid var(--gray-lighter); transition: var(--transition); }
.list-item:hover { background: var(--light); }
.list-item img { width: 100px; height: 70px; object-fit: cover; border-radius: var(--radius-sm); }
.list-item-content { flex: 1; min-width: 0; }
.list-item-content h4 { font-size: 0.95rem; margin-bottom: 8px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.item-meta { display: flex; gap: 15px; font-size: 0.8rem; color: var(--gray); }
.item-meta span { display: flex; align-items: center; gap: 5px; }
.list-item-actions { display: flex; flex-direction: column; gap: 8px; }
.edit-btn, .delete-btn { width: 36px; height: 36px; border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; transition: var(--transition); }
.edit-btn { background: var(--info); color: var(--white); }
.edit-btn:hover { background: #2563eb; }
.delete-btn { background: var(--danger); color: var(--white); }
.delete-btn:hover { background: #dc2626; }

/* Modal */
.modal { position: fixed; inset: 0; background: rgba(0, 0, 0, 0.5); z-index: 3000; display: flex; align-items: center; justify-content: center; opacity: 0; visibility: hidden; transition: var(--transition); }
.modal.active { opacity: 1; visibility: visible; }
.modal-content { background: var(--white); padding: 40px; border-radius: var(--radius-lg); text-align: center; max-width: 400px; }
.modal-icon { width: 70px; height: 70px; margin: 0 auto 20px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 2rem; }
.modal-icon.warning { background: #fef3c7; color: var(--warning); }
.modal-content h3 { margin-bottom: 10px; }
.modal-content p { color: var(--gray); margin-bottom: 25px; }
.modal-actions { display: flex; gap: 15px; justify-content: center; }

/* Toast */
.toast { position: fixed; bottom: 30px; right: 30px; background: var(--success); color: var(--white); padding: 15px 25px; border-radius: var(--radius); display: flex; align-items: center; gap: 12px; box-shadow: var(--shadow-lg); transform: translateX(120%); transition: var(--transition); z-index: 4000; }
.toast.active { transform: translateX(0); }

/* ====================================
   Lightbox
==================================== */
.lightbox { position: fixed; inset: 0; background: rgba(0, 0, 0, 0.95); z-index: 5000; display: flex; align-items: center; justify-content: center; opacity: 0; visibility: hidden; transition: var(--transition); }
.lightbox.active { opacity: 1; visibility: visible; }
.lightbox-img { max-width: 90%; max-height: 90vh; object-fit: contain; border-radius: var(--radius); }
.lightbox-close { position: absolute; top: 30px; right: 30px; width: 50px; height: 50px; background: var(--white); color: var(--dark); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; }

/* ====================================
   Chatbot
==================================== */
.chatbot-container { position: fixed; bottom: 30px; right: 30px; z-index: 1500; }
.chatbot-toggle { width: 60px; height: 60px; background: linear-gradient(135deg, var(--primary), var(--secondary)); color: var(--white); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; box-shadow: var(--shadow-lg); position: relative; transition: var(--transition); }
.chatbot-toggle:hover { transform: scale(1.1); }
.chatbot-pulse { position: absolute; inset: -5px; border-radius: 50%; border: 3px solid var(--primary); animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0; transform: scale(1.3); } }

.chatbot-window { position: absolute; bottom: 80px; right: 0; width: 380px; background: var(--white); border-radius: var(--radius-lg); box-shadow: var(--shadow-xl); overflow: hidden; opacity: 0; visibility: hidden; transform: translateY(20px) scale(0.95); transition: var(--transition); }
.chatbot-window.active { opacity: 1; visibility: visible; transform: translateY(0) scale(1); }
.chatbot-header { background: linear-gradient(135deg, var(--primary), var(--secondary)); color: var(--white); padding: 20px; display: flex; align-items: center; gap: 15px; }
.chatbot-avatar { width: 45px; height: 45px; background: rgba(255, 255, 255, 0.2); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.3rem; }
.chatbot-info h4 { font-size: 1rem; margin-bottom: 3px; }
.chatbot-status { font-size: 0.8rem; opacity: 0.9; display: flex; align-items: center; gap: 5px; }
.chatbot-status i { font-size: 0.5rem; color: #22c55e; }
.chatbot-close { margin-left: auto; background: rgba(255, 255, 255, 0.2); width: 35px; height: 35px; border-radius: 50%; color: var(--white); }
.chatbot-messages { height: 300px; overflow-y: auto; padding: 20px; display: flex; flex-direction: column; gap: 15px; }
.chat-message { max-width: 85%; }
.chat-message.bot { align-self: flex-start; }
.chat-message.user { align-self: flex-end; }
.message-content { padding: 15px; border-radius: var(--radius); font-size: 0.9rem; line-height: 1.5; }
.chat-message.bot .message-content { background: var(--light); border-radius: 0 var(--radius) var(--radius) var(--radius); }
.chat-message.user .message-content { background: var(--primary); color: var(--white); border-radius: var(--radius) 0 var(--radius) var(--radius); }
.message-content ul { margin: 10px 0 0 15px; }
.message-content li { margin-bottom: 5px; }
.chatbot-suggestions { padding: 0 20px 15px; display: flex; flex-wrap: wrap; gap: 8px; }
.suggestion-btn { padding: 8px 14px; background: var(--light); border-radius: var(--radius-full); font-size: 0.8rem; color: var(--gray-dark); transition: var(--transition); }
.suggestion-btn:hover { background: var(--primary); color: var(--white); }
.chatbot-input { display: flex; gap: 10px; padding: 15px 20px; border-top: 1px solid var(--gray-lighter); }
.chatbot-input input { flex: 1; padding: 12px 15px; border: 1px solid var(--gray-lighter); border-radius: var(--radius-full); }
.chatbot-input input:focus { outline: none; border-color: var(--primary); }
.chatbot-input button { width: 45px; height: 45px; background: var(--primary); color: var(--white); border-radius: 50%; display: flex; align-items: center; justify-content: center; transition: var(--transition); }
.chatbot-input button:hover { background: var(--primary-dark); }

/* ====================================
   Footer
==================================== */
.footer { background: var(--darker); color: var(--gray-light); padding: 60px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 40px; }
.footer-logo { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.footer-logo i { font-size: 2rem; color: var(--primary-light); }
.footer-logo span { font-family: 'Montserrat', sans-serif; font-size: 1.4rem; font-weight: 800; color: var(--white); }
.footer-logo strong { color: var(--secondary-light); }
.footer-about p { margin-bottom: 20px; line-height: 1.7; }
.social-links { display: flex; gap: 12px; }
.social-link { width: 42px; height: 42px; background: rgba(255, 255, 255, 0.1); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--white); transition: var(--transition); }
.social-link:hover { background: var(--primary); transform: translateY(-3px); }
.footer-links h3, .footer-contact h3 { color: var(--white); font-size: 1.1rem; margin-bottom: 20px; }
.footer-links ul li { margin-bottom: 12px; }
.footer-links ul li a:hover { color: var(--primary-light); padding-left: 5px; }
.footer-contact ul li { margin-bottom: 12px; display: flex; align-items: flex-start; gap: 12px; }
.footer-contact ul li i { color: var(--primary-light); margin-top: 3px; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.1); padding-top: 25px; text-align: center; font-size: 0.9rem; }

/* ====================================
   Pagination
==================================== */
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 40px; }
.pagination button { width: 42px; height: 42px; border-radius: var(--radius); background: var(--white); color: var(--gray-dark); font-weight: 600; transition: var(--transition); border: 1px solid var(--gray-lighter); }
.pagination button:hover, .pagination button.active { background: var(--primary); color: var(--white); border-color: var(--primary); }

/* ====================================
   Page Transition
==================================== */
.page-transition { position: fixed; inset: 0; background: linear-gradient(135deg, var(--primary), var(--secondary)); z-index: 9999; display: flex; align-items: center; justify-content: center; opacity: 0; visibility: hidden; transition: var(--transition); }
.page-transition.active { opacity: 1; visibility: visible; }
.transition-logo { font-size: 4rem; color: var(--white); animation: pulse 1s infinite; }