/* ====== Văn Phòng Phẩm - Style chung ====== */
:root{
  --primary:#15596b;
  --primary-dark:#0e4250;
  --accent:#f7a800;
  --red:#e23b3b;
  --bg:#f4f6f5;
  --text:#2b2b2b;
  --muted:#777;
  --border:#e4e4e4;
  --radius:10px;
  --shadow:0 2px 12px rgba(0,0,0,.07);
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Segoe UI',Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.55}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 16px}

/* ====== Top bar ====== */
.topbar{background:var(--primary-dark);color:#fff;font-size:13px}
.topbar .container{display:flex;justify-content:space-between;align-items:center;height:38px;flex-wrap:wrap}
.topbar a{color:#fff;opacity:.9}
.topbar a:hover{opacity:1}

/* ====== Header ====== */
.header{background:var(--primary);color:#fff;padding:14px 0}
.header .container{display:flex;align-items:center;gap:24px;flex-wrap:wrap}
.logo{display:flex;align-items:center;gap:10px;font-size:24px;font-weight:800;color:#fff}
.logo .mark{background:#fff;color:var(--primary);width:42px;height:42px;border-radius:50%;display:grid;place-items:center;font-size:15px;font-weight:800;letter-spacing:.5px}
.logo small{display:block;font-size:11px;font-weight:400;opacity:.85;letter-spacing:1px}
.search{flex:1;min-width:220px;display:flex;background:#fff;border-radius:30px;overflow:hidden}
.search input{flex:1;border:0;padding:11px 18px;font-size:14px;outline:none}
.search button{border:0;background:var(--accent);color:#222;padding:0 22px;font-weight:700;cursor:pointer}
.header-actions{display:flex;align-items:center;gap:22px}
.header-actions a{display:flex;align-items:center;gap:8px;font-size:14px}
.cart-link{position:relative}
.cart-count{position:absolute;top:-8px;right:-12px;background:var(--accent);color:#222;font-size:11px;font-weight:700;border-radius:50%;width:20px;height:20px;display:grid;place-items:center}

/* ====== Nav ====== */
.nav{background:#fff;box-shadow:var(--shadow);position:sticky;top:0;z-index:50}
.nav .container{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.nav a{padding:14px 16px;font-weight:600;font-size:14px;border-bottom:3px solid transparent;transition:.15s}
.nav a:hover,.nav a.active{color:var(--primary);border-color:var(--primary)}

/* ====== Hero ====== */
.hero{background:linear-gradient(120deg,var(--primary),#1f8198);color:#fff;padding:54px 0;margin-bottom:30px}
.hero .container{display:flex;align-items:center;gap:40px;flex-wrap:wrap}
.hero-text{flex:1;min-width:280px}
.hero-text h1{font-size:38px;line-height:1.2;margin-bottom:14px}
.hero-text p{font-size:17px;opacity:.92;margin-bottom:24px;max-width:520px}
.btn{display:inline-block;background:var(--accent);color:#222;padding:13px 30px;border-radius:30px;font-weight:700;border:0;cursor:pointer;font-size:15px;transition:.15s}
.btn:hover{transform:translateY(-2px)}
.btn-outline{background:transparent;border:2px solid #fff;color:#fff}
.hero-card{flex:1;min-width:260px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.25);border-radius:14px;padding:26px;backdrop-filter:blur(4px)}
.hero-card h3{margin-bottom:14px;font-size:18px}
.hero-card ul{list-style:none}
.hero-card li{padding:7px 0;border-bottom:1px dashed rgba(255,255,255,.25);display:flex;justify-content:space-between;font-size:14px}

/* ====== Section ====== */
.section{margin:42px 0}
.section-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;border-left:5px solid var(--primary);padding-left:12px}
.section-head h2{font-size:22px;text-transform:uppercase;color:var(--primary-dark)}
.section-head a{color:var(--primary);font-size:14px;font-weight:600}

/* ====== Category grid ====== */
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px}
.cat-card{background:#fff;border-radius:var(--radius);padding:22px 12px;text-align:center;box-shadow:var(--shadow);transition:.15s;border:1px solid var(--border)}
.cat-card:hover{transform:translateY(-4px);border-color:var(--primary)}
.cat-card .ic{font-size:38px;margin-bottom:10px}
.cat-card span{font-weight:600;font-size:14px;display:block}

/* ====== Product grid ====== */
.prod-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:18px}
.card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--border);display:flex;flex-direction:column;transition:.15s}
.card:hover{transform:translateY(-4px);box-shadow:0 8px 22px rgba(0,0,0,.12)}
.thumb{height:170px;display:grid;place-items:center;font-size:62px;background:#f0f5f2;position:relative;overflow:hidden}
.thumb img{width:100%;height:100%;object-fit:contain;padding:12px;background:#fff}
.badge{position:absolute;top:10px;left:10px;background:var(--red);color:#fff;font-size:11px;font-weight:700;padding:3px 9px;border-radius:20px}
.card-body{padding:14px;display:flex;flex-direction:column;gap:8px;flex:1}
.card .cat-tag{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.5px}
.card h3{font-size:14px;font-weight:600;min-height:38px}
.price{display:flex;align-items:baseline;gap:8px;margin-top:auto}
.price .now{color:var(--red);font-weight:800;font-size:17px}
.price .old{color:var(--muted);text-decoration:line-through;font-size:13px}
.add-btn{background:var(--primary);color:#fff;border:0;border-radius:8px;padding:10px;font-weight:700;cursor:pointer;font-size:13px;transition:.15s}
.add-btn:hover{background:var(--primary-dark)}
.thumb-eye{position:absolute;left:0;right:0;bottom:0;background:rgba(21,89,107,.92);color:#fff;font-size:12px;font-weight:600;text-align:center;padding:7px;transform:translateY(100%);transition:.2s}
.thumb:hover .thumb-eye{transform:translateY(0)}

/* ====== Popup chi tiết sản phẩm ====== */
.pm-overlay{position:fixed;inset:0;background:rgba(0,0,0,.55);display:none;align-items:center;justify-content:center;z-index:300;padding:16px}
.pm-overlay.show{display:flex;animation:pmFade .2s ease}
@keyframes pmFade{from{opacity:0}to{opacity:1}}
.pm-box{background:#fff;border-radius:var(--radius);max-width:780px;width:100%;max-height:90vh;overflow:auto;display:grid;grid-template-columns:1fr 1fr;position:relative;box-shadow:0 20px 60px rgba(0,0,0,.3)}
.pm-close{position:absolute;top:12px;right:12px;width:34px;height:34px;border:0;background:#f0f0f0;border-radius:50%;cursor:pointer;font-size:15px;z-index:2}
.pm-close:hover{background:#e0e0e0}
.pm-img{background:#f7f9f8;display:flex;align-items:center;justify-content:center;padding:24px;min-height:300px;position:relative}
.pm-img img{max-width:100%;max-height:320px;object-fit:contain}
.pm-img .pm-ic{font-size:120px}
.pm-info{padding:30px 26px}
.pm-info .cat-tag{display:inline-block;background:#eef4f3;color:var(--primary);font-size:12px;font-weight:600;padding:4px 11px;border-radius:20px;margin-bottom:12px;text-transform:none;letter-spacing:0}
.pm-info h2{font-size:21px;color:var(--text);margin-bottom:12px;line-height:1.35}
.pm-unit{color:var(--muted);font-size:14px;margin-bottom:14px}
.pm-price{font-size:28px;font-weight:800;color:var(--red);margin-bottom:20px}
.pm-price .pm-old{font-size:16px;font-weight:500;color:var(--muted);text-decoration:line-through;margin-left:8px}
.pm-qty{display:flex;align-items:center;gap:14px;margin-bottom:22px}
.pm-actions{display:flex;gap:12px;flex-wrap:wrap}
.pm-actions .btn{flex:1;min-width:150px;padding:13px 18px;font-size:14px}
.btn-buy{background:var(--primary);color:#fff}
.btn-buy:hover{background:var(--primary-dark)}
@media(max-width:640px){
  .pm-box{grid-template-columns:1fr}
  .pm-img{min-height:200px}
  .pm-img .pm-ic{font-size:90px}
}

/* ====== Filter bar ====== */
.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}
.filters button{border:1px solid var(--border);background:#fff;padding:9px 16px;border-radius:30px;cursor:pointer;font-size:13px;font-weight:600;transition:.15s}
.filters button:hover{border-color:var(--primary)}
.filters button.active{background:var(--primary);color:#fff;border-color:var(--primary)}

/* ====== Discount banner ====== */
.discount{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:26px;border:1px dashed var(--accent)}
.discount h2{color:var(--primary-dark);margin-bottom:14px;font-size:20px}
.discount table{width:100%;border-collapse:collapse}
.discount td,.discount th{padding:10px;border-bottom:1px solid var(--border);text-align:left;font-size:14px}
.discount th{color:var(--primary)}
.discount tr td:last-child{font-weight:700;color:var(--red)}

/* ====== Cart page ====== */
.cart-wrap{display:grid;grid-template-columns:1fr 320px;gap:24px;align-items:start}
.cart-items{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.cart-row{display:flex;align-items:center;gap:14px;padding:16px;border-bottom:1px solid var(--border)}
.cart-row .ic{font-size:38px;width:60px;text-align:center}
.cart-row .info{flex:1}
.cart-row .info h4{font-size:14px;margin-bottom:4px}
.qty{display:flex;align-items:center;gap:6px}
.qty button{width:30px;height:30px;border:1px solid var(--border);background:#fff;border-radius:6px;cursor:pointer;font-size:16px;font-weight:700}
.qty span{min-width:30px;text-align:center;font-weight:700}
.remove{color:var(--red);cursor:pointer;font-size:13px;background:none;border:0}
.summary{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;position:sticky;top:80px}
.summary h3{margin-bottom:16px;color:var(--primary-dark)}
.summary .line{display:flex;justify-content:space-between;padding:8px 0;font-size:14px}
.summary .total{border-top:2px solid var(--border);margin-top:8px;padding-top:14px;font-size:19px;font-weight:800}
.summary .total span:last-child{color:var(--red)}
.empty{text-align:center;padding:60px 20px;color:var(--muted)}
.empty .ic{font-size:60px;margin-bottom:14px}

/* ====== Forms / contact ====== */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:start}
.box{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:26px}
.box h2{color:var(--primary-dark);margin-bottom:16px;font-size:20px}
.field{margin-bottom:14px}
.field label{display:block;font-size:13px;font-weight:600;margin-bottom:6px}
.field input,.field textarea{width:100%;padding:11px;border:1px solid var(--border);border-radius:8px;font-size:14px;font-family:inherit}
.info-line{display:flex;gap:12px;padding:10px 0;border-bottom:1px solid var(--border);font-size:14px}
.info-line .ic{font-size:20px;color:var(--primary)}

/* ====== Checkout / giỏ hàng ====== */
.cart-left{display:grid;gap:24px;align-content:start}
.checkout-box{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}
.checkout-box .ck-head{display:flex;align-items:center;gap:10px;margin-bottom:18px;padding-bottom:14px;border-bottom:1px solid var(--border)}
.checkout-box .ck-head .ic{font-size:22px}
.checkout-box .ck-head h3{color:var(--primary-dark);font-size:18px;margin:0}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.field .req{color:var(--red)}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(21,89,107,.12)}
.field textarea{resize:vertical;min-height:64px}
.btn[disabled]{opacity:.6;cursor:not-allowed;transform:none}
.summary .btn{width:100%;margin-top:18px;display:flex;align-items:center;justify-content:center;gap:8px}
.summary .save-badge{background:#eef6f1;color:#1f7a4d;font-size:12.5px;font-weight:600;padding:9px 12px;border-radius:8px;margin-top:12px;display:flex;align-items:center;gap:7px}
.secure-note{font-size:12px;color:var(--muted);text-align:center;margin-top:12px;line-height:1.45}
.summary .cont-link{display:block;text-align:center;margin-top:14px;font-size:13px;color:var(--primary);font-weight:600}
.cart-success{text-align:center;padding:50px 20px;background:#fff;border-radius:var(--radius);box-shadow:var(--shadow)}
.cart-success .ic{font-size:64px;margin-bottom:10px}
.cart-success h2{color:var(--primary-dark);margin-bottom:8px}
.cart-success p{color:var(--muted);margin-bottom:20px;font-size:15px}

/* ====== Footer ====== */
.footer{background:#1d2521;color:#cfd6d1;margin-top:50px;padding:40px 0 0}
.footer .cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:30px;padding-bottom:30px}
.footer h4{color:#fff;margin-bottom:14px;font-size:15px}
.footer a,.footer p{font-size:13px;color:#aab3ad;padding:4px 0;display:block}
.footer a:hover{color:var(--accent)}
.footer-bottom{border-top:1px solid #313b35;text-align:center;padding:16px;font-size:13px;color:#8a948e}

/* ====== Toast ====== */
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(120px);background:var(--primary-dark);color:#fff;padding:14px 26px;border-radius:30px;box-shadow:0 6px 20px rgba(0,0,0,.25);font-weight:600;z-index:200;transition:.3s;font-size:14px}
.toast.show{transform:translateX(-50%) translateY(0)}

.page-title{background:#fff;border-bottom:1px solid var(--border);padding:22px 0}
.page-title h1{font-size:26px;color:var(--primary-dark)}
.breadcrumb{font-size:13px;color:var(--muted);margin-top:4px}

@media(max-width:760px){
  .cart-wrap,.grid-2,.field-row{grid-template-columns:1fr}
  .summary{position:static}
  .hero-text h1{font-size:28px}
  .header .container{gap:12px}
  .search{order:3;width:100%;flex:none}
}