/* (rút gọn — đầy đủ như đã gửi trước) */
:root{ --bg:#0b0f19; --card:#0f172a; --muted:#94a3b8; --text:#e5e7eb; --text-soft:#cbd5e1; --border:rgba(255,255,255,.08); --border-strong:rgba(255,255,255,.14); --accent: var(--accent-hex, #f43f5e); --shadow:0 10px 28px rgba(0,0,0,.35); --radius:14px; }
*{box-sizing:border-box} html{scroll-behavior:smooth} html,body{height:100%}
body{margin:0;color:var(--text);font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";line-height:1.6;background:radial-gradient(1200px 600px at 80% -10%, rgba(244,63,94,0.12), transparent 40%),radial-gradient(1000px 500px at -10% 10%, rgba(99,102,241,0.12), transparent 40%),var(--bg)}
img{max-width:100%;height:auto;display:block}
h1,h2,h3{margin:0 0 8px 0;line-height:1.2;color:#fff} h1.h1{font-size:clamp(28px,3.2vw,42px);font-weight:700} h2{font-size:clamp(20px,2.4vw,28px);font-weight:700} h3{font-size:18px;font-weight:700}
.lead{color:var(--text-soft)} .muted{color:var(--muted)} a{color:#93c5fd;text-decoration:none} a:hover{color:#bfdbfe;text-decoration:underline}
.container{max-width:1200px;margin:0 auto;padding:24px 16px} .section{margin-top:28px}
.grid{display:grid;gap:12px} .grid-2{grid-template-columns:repeat(2,minmax(0,1fr))} .grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
@media(max-width:900px){.grid-3{grid-template-columns:1fr 1fr}} @media(max-width:640px){.grid-2,.grid-3{grid-template-columns:1fr}}
.hero{margin-top:12px} .hero-grid{display:grid;gap:16px;align-items:stretch;grid-template-columns:1.2fr .9fr} @media(max-width:980px){.hero-grid{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:14px;box-shadow:var(--shadow)}
.mini-card{background:rgba(255,255,255,.02);border:1px solid var(--border);border-radius:12px;padding:10px 12px} .price{font-size:18px;font-weight:800}
.badge{display:inline-flex;align-items:center;gap:8px;padding:4px 8px;border-radius:999px;font-size:12px;border:1px solid var(--border-strong);color:var(--text-soft);background:rgba(255,255,255,.03)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:38px;padding:0 14px;border-radius:10px;border:1px solid var(--border-strong);color:#e2e8f0;background:rgba(255,255,255,.05);cursor:pointer;transition:all .15s ease;text-decoration:none}
.btn:hover{background:rgba(255,255,255,.08);transform:translateY(-1px)} .btn:active{transform:translateY(0)}
.btn-primary{background:linear-gradient(180deg,var(--accent),#dc3655);border-color:rgba(255,255,255,.18)} .btn-primary:hover{filter:brightness(1.05)}
.btn-ghost{background:transparent;border:1px solid var(--border)} .list-inline{display:flex;gap:10px;flex-wrap:wrap}
.input{width:100%;height:40px;color:#e5e7eb;background:rgba(255,255,255,.04);border:1px solid var(--border-strong);border-radius:10px;padding:0 12px;outline:none}
.input::placeholder{color:#94a3b8} .input:focus{border-color:#a78bfa;box-shadow:0 0 0 3px rgba(167,139,250,.15)}
.hidden{display:none} .header{position:sticky;top:0;z-index:50;background:rgba(11,15,25,.75);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;gap:12px;padding:10px 16px} .brand{color:#fff;font-weight:800;letter-spacing:.2px;display:inline-flex;align-items:center;gap:8px} .logo-lg{width:28px;height:28px}
.nav-desktop{margin-left:auto;display:flex;gap:14px;flex-wrap:wrap} .nav-desktop a{color:#e5e7eb;padding:6px 10px;border-radius:8px} .nav-desktop a:hover{background:rgba(255,255,255,.06)}
.nav-toggle{display:none;margin-left:8px;padding:6px 10px;border-radius:8px;border:1px solid var(--border);background:rgba(255,255,255,.04);color:#fff}
.nav-mobile{display:none;padding:10px 16px;border-top:1px solid var(--border);background:rgba(11,15,25,.98)} .nav-mobile a{display:block;padding:12px 16px;color:#e5e7eb} .nav-mobile a:hover{background:rgba(255,255,255,.06)}
@media(max-width:760px){.nav-desktop{display:none}.nav-toggle{display:inline-flex}.nav-mobile{display:block}}
.hero, main, section { position: relative; z-index: 1; }
footer{margin-top:28px;padding:20px 16px;color:var(--muted);border-top:1px solid var(--border)}
/* ==== Mobile nav control (append-only) ==== */
.hidden{ display:none !important; }     /* BẮT BUỘC: ẩn khi có class hidden */
body.nav-open{ overflow:hidden; }       /* Khoá cuộn nền khi mở menu */

:root{ --header-h: 64px; }              /* chỉnh nếu header cao/thấp khác */

.nav-mobile{
  position: fixed;
  inset: var(--header-h) 0 0 0;         /* nằm dưới header */
  background: rgba(2, 6, 23, .94);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  padding: 16px 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  z-index: 2000;
  border-top: 1px solid rgba(255,255,255,.06);
}
.nav-mobile a{
  font-size: 18px;
  font-weight: 600;
}
.nav-toggle{
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.04);
  padding: 8px 14px;
  border-radius: 12px;
}
@media (min-width: 1024px){
  .nav-mobile{ display:none !important; } /* desktop: luôn ẩn mobile nav */
}
/* ===== Mobile nav (checkbox hack) ===== */
.hidden{ display:none !important; }
body.nav-open{ overflow:hidden; }

.nav-mobile-wrap{ position:relative; display:block; }
.nav-toggle{
  border:1px solid rgba(255,255,255,.12);
  background:rgba(255,255,255,.04);
  padding:8px 14px; border-radius:12px; cursor:pointer; z-index:3001;
}

/* panel menu */
.nav-mobile{
  position:fixed; left:0; right:0; top:64px; bottom:0;
  background:rgba(2,6,23,.94);
  -webkit-backdrop-filter:blur(8px); backdrop-filter:blur(8px);
  padding:16px 20px 24px; display:none; flex-direction:column; gap:18px;
  z-index:3000; border-top:1px solid rgba(255,255,255,.06);
}
.nav-mobile a{ font-size:18px; font-weight:600; }

/* overlay click-outside */
.nav-overlay{
  position:fixed; inset:0; background:rgba(0,0,0,.45); display:none; z-index:2999;
}

/* khi checkbox bật thì mở menu + overlay */
#navToggle:checked ~ #mobileNav{ display:flex; }
#navToggle:checked ~ .nav-overlay{ display:block; }

/* desktop ẩn mobile panel */
@media (min-width:1024px){
  .nav-mobile{ display:none !important; }
  .nav-overlay{ display:none !important; }
}
/* ==== FIX: Mobile menu về nền tối kiểu cũ ==== */

/* Ưu tiên cao để đè mọi khai báo trước đó */
.header .nav-mobile{
  /* nền tối + hiệu ứng gradient nhẹ giống trang */
  background:
    radial-gradient(800px 400px at 80% -10%, rgba(244,63,94,.12), transparent 40%),
    radial-gradient(600px 300px at -10% 10%, rgba(99,102,241,.12), transparent 40%),
    var(--bg, #0b0f19);
  color: #e5e7eb;             /* chữ sáng */
  border-top: 1px solid rgba(255,255,255,.08);
}

/* Liên kết trong menu: chữ sáng + hover nhẹ */
.header .nav-mobile a{
  color: #e5e7eb;
  border-radius: 10px;
  padding: 10px 8px;
}
.header .nav-mobile a:hover{
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.14);
}

/* Nút Menu cũng dùng tone tối */
.header .nav-toggle{
  background: rgba(255,255,255,.06);
  color: #e5e7eb;
  border: 1px solid rgba(255,255,255,.12);
}

/* Overlay tối hơn một chút */
.nav-overlay{
  background: rgba(2,6,23,.65);
}

/* Bật dark scheme cho trình duyệt (Safari/iOS) để tránh auto nền trắng) */
:root{ color-scheme: dark; }
/* ==== FIX cứng nền tối cho menu mobile ==== */
/* Ưu tiên rất cao + !important để thắng mọi khai báo cũ / CDN */
#mobileNav{
  position: fixed !important;
  left: 0 !important; right: 0 !important; bottom: 0 !important;
  top: 64px !important;                 /* khớp chiều cao header */
  z-index: 4000 !important;

  /* Nền tối đặc, bỏ mờ */
  background: #0b0f19 !important;
  -webkit-backdrop-filter: none !important;
  backdrop-filter: none !important;

  /* viền nhẹ để tách khỏi header */
  border-top: 1px solid rgba(255,255,255,.08) !important;

  /* hiển thị dạng cột khi mở */
  display: none;                        /* mặc định ẩn (checkbox hack sẽ bật) */
  flex-direction: column;
  gap: 18px;
  padding: 16px 20px 24px;
  color: #e5e7eb !important;
}
#mobileNav a{
  color: #e5e7eb !important;
  font-size: 18px;
  font-weight: 600;
  border-radius: 10px;
  padding: 10px 8px;
}
#mobileNav a:hover{
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.14);
}

/* Khi bật checkbox => hiện panel */
#navToggle:checked ~ #mobileNav{ display: flex !important; }

/* Overlay tối, nằm dưới panel */
.nav-overlay{
  position: fixed; inset: 0; z-index: 3999;
  background: rgba(2,6,23,.65) !important;
  display: none;
}
#navToggle:checked ~ .nav-overlay{ display: block !important; }

/* Tùy chọn: thêm gradient nhẹ trên nền tối (không trong suốt) */
#mobileNav::before{
  content:""; position:absolute; inset:0; pointer-events:none;
  background:
    radial-gradient(800px 400px at 80% -10%, rgba(244,63,94,.14), transparent 40%),
    radial-gradient(600px 300px at -10% 10%, rgba(99,102,241,.14), transparent 40%);
  opacity:.9;
}