/* ===== RESET & BASE ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#fff;--bg-alt:#f7f8fa;--text:#26283b;--text-light:#6b6d7b;
  --accent:#987147;--accent-hover:#7a5a38;--dark:#1a1a2e;
  --border:#e8e8e8;--white:#fff;--shadow:0 2px 20px rgba(0,0,0,.06);
  --radius:4px;--transition:.3s ease;
}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'Montserrat',sans-serif;color:var(--text);background:var(--bg);line-height:1.6;overflow-x:hidden}
a{text-decoration:none;color:inherit;transition:color var(--transition)}
ul{list-style:none}
img{max-width:100%;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* ===== HEADER ===== */
.header-top{background:var(--dark);color:var(--white);text-align:center;padding:8px 0;font-size:12px;letter-spacing:1px;text-transform:uppercase}
.main-header{position:sticky;top:0;z-index:1000;background:var(--white);transition:box-shadow var(--transition)}
.main-header.scrolled{box-shadow:0 2px 30px rgba(0,0,0,.08)}
.header-main{border-bottom:1px solid var(--border)}
.header-flex{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;gap:20px}
.header-logo img{height:48px;width:auto}
.header-nav ul{display:flex;gap:32px}
.header-nav a{font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:1.5px;color:var(--text);position:relative;padding:4px 0}
.header-nav a::after{content:'';position:absolute;bottom:-2px;left:0;width:0;height:2px;background:var(--accent);transition:width var(--transition)}
.header-nav a:hover::after,.header-nav a.active::after{width:100%}
.header-nav a:hover,.header-nav a.active{color:var(--accent)}
.header-actions{display:flex;align-items:center;gap:16px}
.search-btn,.zalo-header-btn{background:none;border:none;cursor:pointer;color:var(--text);display:flex;align-items:center;transition:color var(--transition)}
.search-btn:hover,.zalo-header-btn:hover{color:var(--accent)}
.mobile-menu-btn{display:none;background:none;border:none;cursor:pointer;flex-direction:column;gap:5px;padding:4px}
.mobile-menu-btn span{width:22px;height:2px;background:var(--text);transition:var(--transition)}

/* ===== SEARCH OVERLAY ===== */
.search-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.85);z-index:2000;display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transition:var(--transition)}
.search-overlay.open{opacity:1;visibility:visible}
.search-overlay-inner{width:90%;max-width:600px;display:flex;align-items:center;gap:12px}
.search-overlay input{flex:1;background:transparent;border:none;border-bottom:2px solid var(--white);color:var(--white);font-size:24px;padding:12px 0;outline:none;font-family:inherit}
.search-overlay input::placeholder{color:rgba(255,255,255,.5)}
.search-close{background:none;border:none;color:var(--white);cursor:pointer;padding:8px}

/* ===== HERO ===== */
.hero{position:relative;height:85vh;min-height:500px;display:flex;align-items:center;justify-content:center;text-align:center;overflow:hidden}
.hero-bg{position:absolute;inset:0;background:linear-gradient(135deg,#1a1a2e 0%,#2d2d44 50%,#987147 100%);z-index:0}
.hero-bg::after{content:'';position:absolute;inset:0;background:url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="p" width="20" height="20" patternUnits="userSpaceOnUse"><circle cx="10" cy="10" r=".5" fill="rgba(255,255,255,.05)"/></pattern></defs><rect fill="url(%23p)" width="100" height="100"/></svg>');opacity:.6}
.hero-content{position:relative;z-index:1;color:var(--white);padding:0 20px}
.hero-sub{font-size:13px;letter-spacing:4px;text-transform:uppercase;margin-bottom:20px;opacity:.7;animation:fadeUp .8s ease}
.hero-title{font-size:clamp(32px,6vw,64px);font-weight:700;line-height:1.15;margin-bottom:24px;animation:fadeUp .8s ease .15s both}
.hero-desc{font-size:16px;max-width:480px;margin:0 auto 36px;opacity:.8;font-weight:300;animation:fadeUp .8s ease .3s both}
.hero-btn{display:inline-block;padding:14px 40px;border:2px solid var(--white);color:var(--white);font-size:12px;font-weight:600;letter-spacing:2px;text-transform:uppercase;transition:var(--transition);animation:fadeUp .8s ease .45s both}
.hero-btn:hover{background:var(--white);color:var(--dark)}

/* ===== SECTIONS ===== */
.section{padding:80px 0}
.section-header{text-align:center;margin-bottom:48px}
.section-sub{font-size:12px;letter-spacing:3px;text-transform:uppercase;color:var(--accent);margin-bottom:8px;font-weight:600}
.section-title{font-size:28px;font-weight:700;color:var(--text)}

/* ===== CATEGORIES ===== */
.categories{background:var(--bg-alt)}
.category-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.category-card{position:relative;overflow:hidden;cursor:pointer;border-radius:var(--radius)}
.category-card-img{aspect-ratio:3/4;overflow:hidden}
.category-card-img img{width:100%;height:100%;object-fit:cover;transition:transform .6s ease}
.category-card:hover .category-card-img img{transform:scale(1.08)}
.category-card-info{position:absolute;bottom:0;left:0;right:0;padding:24px;background:linear-gradient(transparent,rgba(0,0,0,.7));color:var(--white)}
.category-card-info h3{font-size:18px;font-weight:600;margin-bottom:4px}
.category-card-info span{font-size:12px;opacity:.8}
.category-arrow{position:absolute;right:20px;bottom:24px;width:36px;height:36px;border:1px solid rgba(255,255,255,.4);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:var(--transition)}
.category-card:hover .category-arrow{background:var(--accent);border-color:var(--accent)}

/* ===== FILTER BAR ===== */
.filter-bar{display:flex;justify-content:center;gap:8px;margin-bottom:40px;flex-wrap:wrap}
.filter-btn{padding:10px 24px;border:1px solid var(--border);background:transparent;font-family:inherit;font-size:13px;font-weight:500;cursor:pointer;transition:var(--transition);color:var(--text-light);border-radius:2px}
.filter-btn.active,.filter-btn:hover{background:var(--dark);color:var(--white);border-color:var(--dark)}

/* ===== PRODUCT GRID ===== */
.product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.product-card{cursor:pointer;opacity:0;transform:translateY(20px);animation:fadeUp .5s ease forwards}
.product-card-img{position:relative;aspect-ratio:3/4;overflow:hidden;background:var(--bg-alt);border-radius:var(--radius)}
.product-card-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.product-card:hover .product-card-img img{transform:scale(1.05)}
.product-quick-view{position:absolute;bottom:12px;left:50%;transform:translateX(-50%) translateY(20px);opacity:0;padding:10px 20px;background:var(--dark);color:var(--white);font-size:11px;font-weight:600;letter-spacing:1.5px;text-transform:uppercase;border:none;cursor:pointer;transition:var(--transition);white-space:nowrap;border-radius:2px}
.product-card:hover .product-quick-view{opacity:1;transform:translateX(-50%) translateY(0)}
.product-quick-view:hover{background:var(--accent)}
.product-card-info{padding:14px 0}
.product-card-info h3{font-size:14px;font-weight:500;margin-bottom:6px;transition:color var(--transition)}
.product-card:hover .product-card-info h3{color:var(--accent)}
.product-card-info .product-price{font-size:15px;font-weight:700;color:var(--accent)}

/* ===== PROMO BANNER ===== */
.promo-banner{padding:80px 0;background:var(--dark);text-align:center;color:var(--white)}
.promo-inner{max-width:560px;margin:0 auto}
.promo-sub{font-size:12px;letter-spacing:3px;text-transform:uppercase;color:var(--accent);margin-bottom:12px}
.promo-title{font-size:28px;font-weight:700;margin-bottom:16px;line-height:1.3}
.promo-desc{font-size:14px;opacity:.7;margin-bottom:32px}
.promo-btn{display:inline-block;padding:14px 40px;background:var(--accent);color:var(--white);font-size:12px;font-weight:600;letter-spacing:2px;text-transform:uppercase;transition:var(--transition);border-radius:2px}
.promo-btn:hover{background:var(--accent-hover)}

/* ===== MODAL ===== */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:3000;display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transition:var(--transition);padding:20px}
.modal-overlay.open{opacity:1;visibility:visible}
.modal-content{background:var(--white);max-width:900px;width:100%;max-height:90vh;overflow-y:auto;position:relative;border-radius:var(--radius);transform:scale(.95);transition:transform var(--transition)}
.modal-overlay.open .modal-content{transform:scale(1)}
.modal-close{position:absolute;top:16px;right:16px;background:none;border:none;cursor:pointer;color:var(--text);z-index:1;padding:4px}
.modal-body{display:grid;grid-template-columns:1fr 1fr;min-height:400px}
.modal-img{background:var(--bg-alt)}
.modal-img img{width:100%;height:100%;object-fit:cover}
.modal-info{padding:40px 32px;display:flex;flex-direction:column;gap:12px}
.modal-category{font-size:12px;letter-spacing:2px;text-transform:uppercase;color:var(--accent);font-weight:600}
.modal-name{font-size:22px;font-weight:700}
.modal-price{font-size:20px;font-weight:700;color:var(--accent)}
.modal-desc{font-size:14px;color:var(--text-light);line-height:1.7}
.modal-desc ul{margin-top:8px;padding-left:18px;list-style:disc}
.modal-desc li{margin-bottom:4px}
.modal-sizes{display:flex;align-items:center;gap:12px;margin-top:8px}
.size-label{font-size:13px;font-weight:600}
.size-options{display:flex;gap:8px}
.size-btn{width:40px;height:40px;border:1px solid var(--border);background:transparent;font-family:inherit;font-size:13px;font-weight:600;cursor:pointer;transition:var(--transition)}
.size-btn.active,.size-btn:hover{background:var(--dark);color:var(--white);border-color:var(--dark)}
.modal-order-btn{display:flex;align-items:center;justify-content:center;gap:8px;padding:14px;background:var(--accent);color:var(--white);font-size:13px;font-weight:600;letter-spacing:1px;text-transform:uppercase;text-align:center;margin-top:12px;transition:var(--transition);border-radius:2px}
.modal-order-btn:hover{background:var(--accent-hover)}
.modal-call-btn{display:flex;align-items:center;justify-content:center;gap:8px;padding:12px;border:1px solid var(--border);font-size:13px;font-weight:500;transition:var(--transition);border-radius:2px;color:var(--text)}
.modal-call-btn:hover{border-color:var(--accent);color:var(--accent)}

/* ===== FOOTER ===== */
.main-footer{background:var(--dark);color:rgba(255,255,255,.8);padding:60px 0 0}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer-logo{height:40px;margin-bottom:16px;background:#fff;padding:6px;border-radius:6px}
.footer-brand p{font-size:14px;line-height:1.7;opacity:.7}
.footer-col h4{font-size:14px;font-weight:600;text-transform:uppercase;letter-spacing:1px;margin-bottom:16px;color:var(--white)}
.footer-col ul li{margin-bottom:10px}
.footer-col ul a{font-size:14px;opacity:.7;transition:var(--transition)}
.footer-col ul a:hover{opacity:1;color:var(--accent)}
.contact-list li{display:flex;align-items:center;gap:8px}
.contact-list svg{opacity:.6;flex-shrink:0}
.footer-bottom{text-align:center;padding:24px 0;font-size:13px;opacity:.5}

/* ===== FLOATING BUTTONS ===== */
.floating-buttons{position:fixed;bottom:24px;right:24px;display:flex;flex-direction:column;gap:12px;z-index:900}
.float-btn{width:52px;height:52px;border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 20px rgba(0,0,0,.2);transition:transform var(--transition)}
.float-btn:hover{transform:scale(1.1)}
.zalo-float{background:#0068ff}
.phone-float{background:var(--accent)}
.chat-float{background:#1a1a2e}

/* ===== BACK TO TOP ===== */
.back-to-top{position:fixed;bottom:24px;left:24px;width:44px;height:44px;border:1px solid var(--border);background:var(--white);border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:0;visibility:hidden;transition:var(--transition);z-index:900;box-shadow:var(--shadow)}
.back-to-top.visible{opacity:1;visibility:visible}
.back-to-top:hover{background:var(--dark);color:var(--white);border-color:var(--dark)}

/* ===== ANIMATIONS ===== */
@keyframes fadeUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}

/* ===== RESPONSIVE ===== */
@media(max-width:991px){
  .product-grid{grid-template-columns:repeat(3,1fr)}
  .category-grid{grid-template-columns:repeat(3,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .modal-body{grid-template-columns:1fr}
  .modal-img{max-height:350px}
}
@media(max-width:767px){
  .header-nav{position:fixed;top:0;left:0;width:280px;height:100%;background:var(--white);z-index:2000;transform:translateX(-100%);transition:transform var(--transition);padding:60px 24px 24px;box-shadow:2px 0 20px rgba(0,0,0,.1)}
  .header-nav.open{transform:translateX(0)}
  .header-nav ul{flex-direction:column;gap:24px}
  .mobile-menu-btn{display:flex}
  .hero{height:70vh;min-height:400px}
  .hero-title{font-size:28px}
  .product-grid{grid-template-columns:repeat(2,1fr);gap:16px}
  .category-grid{grid-template-columns:1fr;gap:16px}
  .category-card-img{aspect-ratio:16/9}
  .section{padding:60px 0}
  .footer-grid{grid-template-columns:1fr;gap:30px}
  .promo-title{font-size:22px}
  .filter-bar{gap:6px}
  .filter-btn{padding:8px 16px;font-size:12px}
}
@media(max-width:480px){
  .product-grid{gap:12px}
  .product-card-info h3{font-size:13px}
  .product-card-info .product-price{font-size:14px}
  .header-logo img{height:36px}
}