/**
 * MAIN CSS - XỐP EPS KINH BẮC V2
 * Modern, Clean, Professional
 */

/* ========== VARIABLES ========== */
:root {
    --primary: #FF6B35;
    --secondary: #F7931E;
    --dark: #1B3765;
    --text: #2C3E50;
    --light: #F8F9FA;
    --white: #FFFFFF;
    --success: #10B981;
    --error: #EF4444;
    
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --transition: 0.3s ease;
    --shadow: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --radius: 12px;
    --container: 1200px;
}

/* ========== RESET ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--text); line-height: 1.6; }
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ========== CONTAINER ========== */
.container { max-width: var(--container); margin: 0 auto; padding: 0 20px; }
.section { padding: 60px 0; }
.section-alt { background: var(--light); }

/* ========== HEADER ========== */
.header {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    max-width: var(--container);
    margin: 0 auto;
}

.logo img { 
    height: 60px;
    display: block;
    max-width: 100%;
}

.nav {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-item {
    position: relative;
}

.nav-link {
    font-weight: 600;
    color: var(--text);
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.85rem;
    white-space: nowrap;
}

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

.nav-link.has-dropdown::after {
    content: '▼';
    font-size: 0.7rem;
}

/* Dropdown */
.dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--white);
    min-width: 250px;
    box-shadow: var(--shadow-lg);
    border-radius: 8px;
    padding: 10px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s;
    margin-top: 10px;
}

.nav-item:hover .dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    padding: 12px 20px;
    color: var(--text);
    transition: var(--transition);
    display: block;
}

.dropdown-item:hover {
    background: var(--light);
    color: var(--primary);
    padding-left: 25px;
}

.header-cta {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    transition: var(--transition);
}

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

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
}

/* ========== HERO ========== */
.hero {
    background: linear-gradient(135deg, var(--dark) 0%, #2C5282 100%);
    color: var(--white);
    padding: 80px 20px;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 20px;
    color: var(--white);
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 30px;
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========== BUTTONS ========== */
.btn {
    padding: 14px 28px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1.05rem;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    box-shadow: 0 4px 12px rgba(255,107,53,0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255,107,53,0.4);
}

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

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

/* ========== GRID ========== */
.grid {
    display: grid;
    gap: 30px;
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.grid-5 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

/* ========== CARDS ========== */
.card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    padding: 25px;
}

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

.card-image {
    width: 100% !important;
    height: 280px !important;
    object-fit: cover !important;
    display: block !important;
    flex-shrink: 0;
}

.card-content {
    padding: 25px;
    flex-grow: 1;
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 15px;
}

.card-text {
    color: var(--text);
    line-height: 1.8;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    min-height: 5.4em; /* 3 lines * 1.8 line-height */
}

/* ========== PRODUCT CARD ========== */
.product-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

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

.product-image {
    width: 100% !important;
    height: 280px !important;
    object-fit: cover !important;
    display: block !important;
    flex-shrink: 0;
}

.product-content {
    padding: 20px;
    flex-grow: 1;
}

.product-category {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text);
    opacity: 0.7;
    margin-bottom: 8px;
    font-weight: 600;
}

.product-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 10px;
}

.product-desc {
    color: var(--text);
    margin-bottom: 15px;
    line-height: 1.6;
}

.product-link {
    color: var(--primary);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.product-link:hover { gap: 10px; }

/* ========== BOX IMAGE (for homepage products) ========== */
.box-image img,
.box-image {
    width: 100% !important;
    height: 280px !important;
    object-fit: cover !important;
    display: block !important;
}

/* ========== SECTION HEADER ========== */
.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-badge {
    display: inline-block;
    background: rgba(255,107,53,0.1);
    color: var(--primary);
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 15px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text);
    max-width: 700px;
    margin: 0 auto;
}

/* ========== FOOTER ========== */
.footer {
    background: var(--dark);
    color: rgba(255,255,255,0.8);
    padding: 50px 20px 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 30px;
}

.footer-title {
    color: var(--white);
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255,255,255,0.8);
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 0.9rem;
}

/* ========== STICKY CTA ========== */
.sticky-cta {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: 0 -4px 12px rgba(0,0,0,0.1);
    padding: 15px 20px;
    z-index: 999;
    transform: translateY(100%);
    transition: var(--transition);
}

.sticky-cta.show {
    transform: translateY(0);
}

.sticky-cta-container {
    max-width: var(--container);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 15px;
}

.sticky-cta-text {
    font-weight: 600;
    color: var(--dark);
}

.sticky-cta-buttons {
    display: flex;
    gap: 10px;
}

.sticky-btn {
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    transition: var(--transition);
    white-space: nowrap;
}

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

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
    .nav { display: none; }
    .mobile-menu-btn { display: block; }
    .hero h1 { font-size: 2rem; }
    .hero p { font-size: 1rem; }
    .section-title { font-size: 1.75rem; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .sticky-cta-container { flex-direction: column; text-align: center; }
    .sticky-cta-buttons { width: 100%; flex-direction: column; }
    .sticky-btn { width: 100%; }
}

/* ========== PAGINATION ========== */
.pagination-container {
    margin-top: 50px;
    display: flex;
    justify-content: center;
}

.pagination {
    display: inline-flex;
    gap: 8px;
    align-items: center;
    background: var(--white);
    padding: 10px;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.pagination-btn {
    min-width: 40px;
    height: 40px;
    padding: 8px 12px;
    border: 2px solid #E5E7EB;
    background: var(--white);
    color: var(--text);
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.95rem;
}

.pagination-btn:hover:not(.disabled):not(.active) {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.pagination-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(255,107,53,0.3);
}

.pagination-btn.disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.pagination-dots {
    padding: 0 8px;
    color: var(--text);
    opacity: 0.5;
    font-weight: 600;
}

@media (max-width: 768px) {
    .pagination {
        gap: 4px;
        padding: 8px;
    }
    
    .pagination-btn {
        min-width: 36px;
        height: 36px;
        padding: 6px 10px;
        font-size: 0.85rem;
    }
}


/* ========== PAGINATION ========== */
.pagination-container {
    margin-top: 50px;
    text-align: center;
}

.pagination {
    display: inline-flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
}

.pagination-btn {
    padding: 10px 16px;
    border: 2px solid #E5E7EB;
    background: var(--white);
    color: var(--text);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    min-width: 44px;
}

.pagination-btn:hover:not(.disabled):not(.active) {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.pagination-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(255,107,53,0.3);
}

.pagination-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-dots {
    padding: 0 8px;
    color: #9CA3AF;
    font-weight: 600;
}

@media (max-width: 768px) {
    .pagination-btn {
        padding: 8px 12px;
        font-size: 0.9rem;
        min-width: 40px;
    }
}}