/* =============================================
   AquaChem - Homepage Styles
   ============================================= */

/* ===== HERO SLIDER ===== */
.hero-slider { position: relative; overflow: hidden; background: var(--gray-200); height: 70vh; }
.hero-slider .slide {
    position: absolute; inset: 0;
    transform: translateX(100%);
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform;
}
.hero-slider .slide.active { transform: translateX(0); z-index: 1; }
.hero-slider .slide.slide-out-left  { transform: translateX(-100%); z-index: 1; }
.hero-slider .slide.slide-out-right { transform: translateX(100%);  z-index: 1; }
.hero-slider .slide img { width: 100%; height: 100%; object-fit: cover; }
.hero-slider .slide-overlay {
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    display: flex; align-items: center;
    background: linear-gradient(90deg, rgba(0,0,0,0.4) 0%, transparent 60%);
}
.hero-slider .slide-content {
    color: var(--white); max-width: 600px; padding:0 100px;
}
.hero-slider .slide-content h2 {
    font-size: 2rem; font-weight: 700; margin-bottom: 10px;
    text-shadow: 0 2px 8px rgba(0,0,0,0.3); line-height: 1.2;
}
.hero-slider .slide-content p {
    font-size: 1.05rem; margin-bottom: 20px;
    text-shadow: 0 1px 4px rgba(0,0,0,0.3); opacity: 0.95;
}
.slider-btn {
    position: absolute; top: 50%; transform: translateY(-50%);
    background: rgba(255,255,255,0.8); border: none;
    width: 44px; height: 44px; border-radius: 50%; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    font-size: 1rem; color: var(--gray-700); transition: var(--transition); z-index: 10;
}
.slider-btn:hover { background: var(--white); box-shadow: var(--box-shadow-md); }
.slider-prev { left: 20px; }
.slider-next { right: 20px; }
.slider-dots {
    position: absolute; bottom: 16px; left: 50%; transform: translateX(-50%);
    display: flex; gap: 8px; z-index: 10;
}
.slider-dots .dot {
    width: 10px; height: 10px; border-radius: 50%;
    background: rgba(255,255,255,0.5); cursor: pointer; transition: var(--transition);
}
.slider-dots .dot.active { background: var(--white); transform: scale(1.2); }

/* ===== ADVANTAGES BAR ===== */
.advantages-bar { background: white; padding: 20px 0; }
.advantages-bar .container { display: grid; grid-template-columns: repeat(4,1fr); gap: 20px; }
.advantage-item {  display: flex; align-items: center; gap: 14px; color: var(--white); }
.advantage-item img { width: 70px; height: 70px; object-fit: contain; flex-shrink: 0; background-color: var(--primary); padding: 10px; border-radius: 10px;}
.advantage-item .advantage-icon { 
    width: 40px; height: 40px; display: flex; align-items: center; justify-content: center;
    font-size: 1.4rem; color: var(--white); flex-shrink: 0; padding: 10px; ;
}
.advantage-item h4 { font-size: 1.1rem; font-weight: 600; margin-bottom: 2px; color: black; }
.advantage-item p { font-size: 0.75rem; color: rgba(0, 0, 0, 0.8); line-height: 1.3; }

/* ===== CATEGORY ICONS GRID ===== */
.category-icons-grid {
    display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px;
}
.category-icon-card {
    display: flex; flex-direction: column; align-items: center;
    text-align: center; padding: 28px 16px;
    background: var(--white); border-radius: var(--border-radius);
    box-shadow: var(--box-shadow); transition: var(--transition);
    text-decoration: none; color: var(--gray-700);
}
.category-icon-card:hover {
    transform: translateY(-4px); box-shadow: var(--box-shadow-lg); color: var(--primary);
}
.category-icon-card img { width: 72px; height: 72px; object-fit: contain; margin-bottom: 14px; }
.category-icon-card h3 { font-size: 0.875rem; font-weight: 600; line-height: 1.3; }

/* ===== CATEGORY BOX CARDS ===== */
.category-boxes { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.category-box {
    position: relative; border-radius: var(--border-radius-lg);
    overflow: hidden; height: 500px; display: block;
}
.category-box img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.category-box:hover img { transform: scale(1.05); }
.category-box .box-overlay {
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    display: flex; flex-direction: column; justify-content: flex-end;
    padding: 24px;
    background: linear-gradient(transparent 40%, rgba(0,0,0,0.75));
    color: var(--white);
}
.category-box .box-overlay h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 6px; }
.category-box .box-overlay p {
    font-size: 0.85rem; opacity: 0.9; margin-bottom: 14px;
    max-height: 0; overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.3s ease;
    opacity: 0;
}
.category-box .box-overlay .btn {
    align-self: flex-start;
    font-size: 0.8rem; padding: 8px 18px;
    transform: translateY(10px); opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
}
.category-box:hover .box-overlay p {
    max-height: 60px; opacity: 0.9;
}
.category-box:hover .box-overlay .btn {
    transform: translateY(0); opacity: 1;
}

/* ===== FEATURED TOPICS ===== */
.featured-topics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.featured-topic-card {
    position: relative; border-radius: var(--border-radius-lg);
    overflow: hidden; height: 500px; display: block;
    text-decoration: none;
}
.featured-topic-card img {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform 0.4s ease; display: block;
}
.featured-topic-card:hover img { transform: scale(1.05); }
.featured-topic-card .content {
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    text-align: center; padding: 24px;
    background: rgba(0,0,0,0.42);
    transition: background 0.3s ease;
}
.featured-topic-card:hover .content { background: rgba(0, 0, 0, 0.781); }
.featured-topic-card h3 {
    font-size: 2.8rem; font-weight: 700; color: var(--white);
    margin-bottom: 10px; text-shadow: 0 2px 8px rgba(0,0,0,0.4);
    line-height: 1.3;
}
.featured-topic-card p {
    font-size: 0.88rem; color: rgba(255,255,255,0.88);
    margin-bottom: 20px; line-height: 1.5;
    text-shadow: 0 1px 4px rgba(0,0,0,0.4);
}
.featured-topic-card .btn {
    transform: translateY(8px); opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
}
.featured-topic-card:hover .btn { transform: translateY(0); opacity: 1; }

/* ===== BIG BANNER ===== */
.big-banner { position: relative; width: 100%; overflow: hidden; }
.big-banner .banner-link {
    display: block; position: relative; text-decoration: none;
}
.big-banner img {
    width: 100%; object-fit: cover; display: block;
    transition: transform 0.4s ease;
}
.big-banner:hover img { transform: scale(1.02); }
.big-banner .banner-overlay {
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    background: rgba(0,0,0,0.45);
    text-align: center; padding: 20px;
}
.big-banner .banner-overlay-inner {
    width: 50%;
    display: flex; flex-direction: column; align-items: center;
}
.big-banner .banner-overlay h2 {
    font-size: 3.6rem; font-weight: 700; color: var(--white);
    text-shadow: 0 2px 10px rgba(0,0,0,0.5); margin-bottom: 16px;
}
.big-banner .banner-overlay p {
    font-size: 1.5rem; color: rgba(255,255,255,0.92);
    text-shadow: 0 1px 6px rgba(0,0,0,0.4); margin-bottom: 28px;
    line-height: 1.7;
}
@media (max-width: 768px) {
    .big-banner .banner-overlay-inner { width: 90%; }
    .big-banner .banner-overlay h2 { font-size: 1.6rem; }
    .big-banner .banner-overlay p { font-size: 0.95rem; }
}

/* ===== BRANDS ===== */
.brands-section { padding: 40px 0; }
.brands-grid { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 30px; }
.brands-grid img {
    height: 48px; object-fit: contain;
    filter: grayscale(100%); opacity: 0.6; transition: var(--transition);
}
.brands-grid img:hover { filter: grayscale(0%); opacity: 1; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .category-icons-grid { grid-template-columns: repeat(4, 1fr); }
    .advantages-bar .container { grid-template-columns: repeat(2,1fr); }
    .category-boxes { grid-template-columns: repeat(2, 1fr); }
    .featured-topics { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .category-icons-grid { grid-template-columns: repeat(3, 1fr); gap: 10px; }
    .advantages-bar .container { grid-template-columns: 1fr 1fr; gap: 14px; }
    .hero-slider .slide img { height: 250px; }
    .hero-slider .slide-content h2 { font-size: 1.3rem; }
    .hero-slider .slide-content { padding: 0 20px; }
}
@media (max-width: 480px) {
    .category-icons-grid { grid-template-columns: repeat(2, 1fr); }
    .advantages-bar .container { grid-template-columns: 1fr; }
    .hero-slider .slide img { height: 200px; }
}