/* vsisremote.vsis.net — màu lấy từ logo VsisRemote (assets/branding/svg):
   teal #1c6c86 · navy #0d2c36 · cyan nhấn #7ad3e6; VSIS: #146478 / #0064b4 / #073140 / vàng #ffbe20 */
:root {
  --brand: #1c6c86;
  --brand-2: #146478;
  --accent: #0064b4;
  --cyan: #7ad3e6;
  --navy: #0d2c36;
  --navy-2: #073140;
  --gold: #ffbe20;
  --bg: #f4f7f9;
  --card: #ffffff;
  --text: #1f2a30;
  --muted: #5f7179;
  --border: #e2e8ec;
  --radius: 14px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: 'Be Vietnam Pro', -apple-system, 'Segoe UI', Roboto, sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
svg.i { width: 18px; height: 18px; flex-shrink: 0; }

/* Thanh trên */
.nav { position: sticky; top: 0; z-index: 50; background: rgba(13,44,54,.92); backdrop-filter: blur(8px); border-bottom: 1px solid rgba(255,255,255,.08); }
.nav .wrap { display: flex; align-items: center; gap: 24px; height: 62px; }
.nav .brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 700; font-size: 18px; letter-spacing: -.3px; }
.nav .brand img { width: 32px; height: 32px; border-radius: 8px; }
.nav .brand span { color: var(--cyan); }
.nav .brand:hover { text-decoration: none; }
.nav .links { display: flex; gap: 22px; margin-left: auto; align-items: center; }
.nav .links a { color: rgba(255,255,255,.82); font-size: 14px; font-weight: 500; }
.nav .links a:hover { color: #fff; text-decoration: none; }
@media (max-width: 760px) { .nav .links a.hide-m { display: none; } .nav .links { gap: 14px; } }

/* Nút */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 20px; border-radius: 10px; font-weight: 700; font-size: 15px; border: 0; cursor: pointer; transition: transform .15s, box-shadow .15s, opacity .15s; font-family: inherit; }
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: linear-gradient(135deg, var(--brand), var(--accent)); color: #fff; box-shadow: 0 6px 18px rgba(20,100,120,.28); }
.btn-gold { background: var(--gold); color: var(--navy); }
.btn-ghost { background: rgba(255,255,255,.08); color: #fff; border: 1px solid rgba(255,255,255,.22); }
.btn-outline { background: #fff; color: var(--brand); border: 1px solid var(--brand); }
.btn-sm { padding: 8px 14px; font-size: 13.5px; }
.btn[aria-disabled="true"] { opacity: .5; pointer-events: none; box-shadow: none; }

/* Hero */
.hero { background: radial-gradient(1200px 500px at 85% -10%, rgba(122,211,230,.25), transparent 60%), linear-gradient(160deg, var(--navy) 0%, var(--navy-2) 45%, var(--brand) 100%); color: #fff; padding: 72px 0 84px; overflow: hidden; }
.hero .wrap { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.hero h1 { font-size: 46px; line-height: 1.15; margin: 0 0 16px; letter-spacing: -1px; font-weight: 800; }
.hero h1 em { font-style: normal; color: var(--cyan); }
.hero p.lead { font-size: 18px; opacity: .88; margin: 0 0 28px; max-width: 560px; }
.hero .tags { font-family: 'JetBrains Mono', Consolas, monospace; font-size: 13px; letter-spacing: 3px; color: var(--cyan); margin-bottom: 18px; }
.hero .cta { display: flex; gap: 12px; flex-wrap: wrap; }
.hero .note { margin-top: 18px; font-size: 13.5px; opacity: .75; display: flex; gap: 8px; align-items: center; }
.hero .shots { position: relative; height: 520px; }
.hero .shots img { position: absolute; width: 250px; border-radius: 26px; border: 6px solid #0b232b; box-shadow: 0 30px 60px rgba(0,0,0,.4); }
.hero .shots img:nth-child(1) { left: 6%; top: 30px; transform: rotate(-5deg); }
.hero .shots img:nth-child(2) { right: 4%; top: 0; transform: rotate(4deg); }
@media (max-width: 900px) {
  .hero { padding: 48px 0 56px; }
  .hero .wrap { grid-template-columns: 1fr; }
  .hero h1 { font-size: 34px; }
  .hero .shots { height: 380px; }
  .hero .shots img { width: 190px; }
}

/* Khối nội dung */
section.block { padding: 72px 0; }
section.block.alt { background: #fff; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.sec-head { text-align: center; max-width: 700px; margin: 0 auto 40px; }
.sec-head h2 { font-size: 32px; margin: 0 0 10px; color: var(--navy); letter-spacing: -.5px; }
.sec-head p { margin: 0; color: var(--muted); font-size: 16px; }
.eyebrow { display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: var(--brand); margin-bottom: 10px; }

/* Lưới tính năng */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 900px) { .features { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 580px) { .features { grid-template-columns: 1fr; } }
.feature { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.feature .ic { width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center; background: rgba(28,108,134,.1); color: var(--brand); margin-bottom: 14px; }
.feature .ic svg { width: 22px; height: 22px; }
.feature h3 { font-size: 17px; margin: 0 0 6px; color: var(--navy); }
.feature p { margin: 0; color: var(--muted); font-size: 14.5px; }
.feature ul { margin: 8px 0 0; padding-left: 18px; color: var(--muted); font-size: 14px; }

/* Ảnh chụp */
.gallery { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
@media (max-width: 900px) { .gallery { grid-template-columns: repeat(2, 1fr); } }
.gallery figure { margin: 0; }
.gallery img { border-radius: 18px; border: 1px solid var(--border); box-shadow: 0 10px 30px rgba(13,44,54,.08); }
.gallery figcaption { text-align: center; font-size: 13.5px; color: var(--muted); margin-top: 10px; }

/* Bảng gói */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; max-width: 980px; margin: 0 auto; }
@media (max-width: 860px) { .plans { grid-template-columns: 1fr; max-width: 460px; } }
.plan { background: var(--card); border: 2px solid var(--border); border-radius: 16px; padding: 26px 22px; display: flex; flex-direction: column; position: relative; }
.plan.hl { border-color: var(--gold); }
.plan .badge { position: absolute; top: -11px; left: 50%; transform: translateX(-50%); background: var(--gold); color: var(--navy); font-size: 11px; font-weight: 800; letter-spacing: .5px; text-transform: uppercase; padding: 4px 10px; border-radius: 6px; white-space: nowrap; }
.plan h3 { margin: 0; font-size: 20px; color: var(--navy); }
.plan .sub { color: var(--muted); font-size: 13.5px; margin: 2px 0 14px; }
.plan .price { font-size: 28px; font-weight: 800; color: var(--brand); margin-bottom: 14px; }
.plan .price small { font-size: 14px; font-weight: 500; color: var(--muted); }
.plan ul { list-style: none; padding: 0; margin: 0 0 22px; flex: 1; }
.plan li { display: flex; gap: 9px; align-items: flex-start; padding: 5px 0; font-size: 14.5px; }
.plan li svg { width: 16px; height: 16px; color: var(--brand); margin-top: 4px; flex-shrink: 0; }
.plan li.off { color: var(--muted); }
.plan li.off svg { color: #a3b1b7; }
.plans-note { text-align: center; color: var(--muted); font-size: 14px; margin-top: 22px; }

/* Thẻ tải */
.dl-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
@media (max-width: 980px) { .dl-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .dl-grid { grid-template-columns: 1fr; } }
.dl { background: var(--card); border: 2px solid var(--border); border-radius: 16px; padding: 24px 20px; display: flex; flex-direction: column; gap: 10px; position: relative; transition: border-color .2s, box-shadow .2s; }
.dl.mine { border-color: var(--brand); box-shadow: 0 12px 30px rgba(28,108,134,.16); }
.dl .mine-tag { display: none; position: absolute; top: -11px; left: 18px; background: var(--brand); color: #fff; font-size: 11px; font-weight: 700; padding: 3px 10px; border-radius: 6px; }
.dl.mine .mine-tag { display: block; }
.dl .os { display: flex; align-items: center; gap: 12px; }
.dl .os svg { width: 34px; height: 34px; color: var(--navy); }
.dl h3 { margin: 0; font-size: 19px; color: var(--navy); }
.dl .meta { font-size: 13px; color: var(--muted); min-height: 40px; }
.dl .btns { display: flex; flex-direction: column; gap: 8px; margin-top: auto; }
.dl .soon { display: inline-block; align-self: flex-start; background: #eef2f4; color: var(--muted); font-size: 11.5px; font-weight: 700; padding: 3px 9px; border-radius: 6px; text-transform: uppercase; letter-spacing: .4px; }

/* Các bước */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; counter-reset: s; }
@media (max-width: 800px) { .steps { grid-template-columns: 1fr; } }
.step { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; position: relative; }
.step::before { counter-increment: s; content: counter(s); position: absolute; top: 18px; right: 20px; font-size: 40px; font-weight: 800; color: rgba(28,108,134,.12); line-height: 1; }
.step h3 { margin: 0 0 6px; font-size: 17px; color: var(--navy); }
.step p { margin: 0; color: var(--muted); font-size: 14.5px; }

/* Hộp ghi chú */
.callout { display: flex; gap: 14px; background: rgba(28,108,134,.07); border: 1px solid rgba(28,108,134,.22); border-radius: 12px; padding: 16px 18px; font-size: 14.5px; color: var(--navy); }
.callout svg { width: 22px; height: 22px; color: var(--brand); flex-shrink: 0; margin-top: 1px; }
.callout.warn { background: rgba(255,190,32,.1); border-color: rgba(255,190,32,.45); }
.callout.warn svg { color: #b7860b; }

/* Hỏi đáp */
.faq { max-width: 820px; margin: 0 auto; }
.faq details { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 0 20px; margin-bottom: 10px; }
.faq summary { cursor: pointer; padding: 16px 0; font-weight: 700; color: var(--navy); list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary svg { width: 18px; height: 18px; transition: transform .2s; color: var(--brand); flex-shrink: 0; margin-top: 3px; }
.faq details[open] summary svg { transform: rotate(180deg); }
.faq details p { margin: 0 0 16px; color: var(--muted); font-size: 14.5px; }

/* Dải kêu gọi */
.band { background: linear-gradient(135deg, var(--navy-2), var(--brand)); color: #fff; border-radius: 20px; padding: 40px; display: flex; gap: 24px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.band h2 { margin: 0 0 6px; font-size: 26px; }
.band p { margin: 0; opacity: .85; }

/* Chân trang */
footer { background: var(--navy); color: rgba(255,255,255,.72); padding: 40px 0 28px; font-size: 14px; margin-top: 72px; }
footer .cols { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 28px; }
@media (max-width: 760px) { footer .cols { grid-template-columns: 1fr; } }
footer h4 { color: #fff; margin: 0 0 10px; font-size: 14px; }
footer a { color: rgba(255,255,255,.72); display: block; padding: 3px 0; }
footer a:hover { color: #fff; }
footer .copy { border-top: 1px solid rgba(255,255,255,.1); margin-top: 28px; padding-top: 18px; font-size: 13px; }

/* Tiêu đề trang con */
.page-head { background: linear-gradient(160deg, var(--navy) 0%, var(--navy-2) 55%, var(--brand) 100%); color: #fff; padding: 56px 0 60px; text-align: center; }
.page-head h1 { margin: 0 0 10px; font-size: 38px; letter-spacing: -.8px; }
.page-head p { margin: 0 auto; opacity: .85; max-width: 640px; }
@media (max-width: 600px) { .page-head h1 { font-size: 30px; } }