:root {
  --bg: #141419; --bg-2: #1b1b21; --card: #20202a; --card-2: #2a2a36;
  --line: rgba(255,255,255,.09); --line-2: rgba(255,255,255,.16);
  --text: #fafafa; --muted: #a6a6b8; --dim: #74748a;
  --brand: #8c8cea; --pink: #ff6fb5; --amber: #ffc65c; --lime: #b8f26b;
  --ok: #4ade80; --warn: #fbbf24; --bad: #f87171;
  --grad: linear-gradient(110deg, var(--brand), var(--pink) 55%, var(--amber));
  --grad-loop: linear-gradient(110deg, var(--brand), var(--pink), var(--amber), var(--pink), var(--brand));
  --font: 'Inter', system-ui, sans-serif;
  --head: 'Plus Jakarta Sans', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
  color-scheme: dark;
}
* { box-sizing: border-box; margin: 0; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; overflow-x: clip; }
body { background: var(--bg); color: var(--text); font: 16px/1.6 var(--font); overflow-x: clip; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; color: inherit; }
.wrap { width: min(1160px, 100% - 32px); margin-inline: auto; }
.mono { font-family: var(--mono); }
.center { text-align: center; }
.center .sub { margin-inline: auto; }

/* ---------- nền động ---------- */
.blobs { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.blobs i { position: absolute; width: 46vmax; height: 46vmax; border-radius: 50%; filter: blur(90px); opacity: .26; animation: float 22s ease-in-out infinite alternate; }
.blobs i:nth-child(1) { background: var(--brand); top: -18vmax; left: -12vmax; }
.blobs i:nth-child(2) { background: var(--pink); top: 25vh; right: -22vmax; animation-delay: -7s; }
.blobs i:nth-child(3) { background: var(--amber); bottom: -26vmax; left: 20vw; opacity: .14; animation-delay: -13s; }
@keyframes float { to { transform: translate(6vmax, 4vmax) scale(1.15) rotate(25deg); } }

/* ---------- nav ---------- */
.nav { position: sticky; top: 0; z-index: 50; backdrop-filter: blur(14px); background: rgba(20,20,25,.72); border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; align-items: center; gap: 20px; height: 64px; }
.logo { font: 800 18px var(--head); display: flex; align-items: center; gap: 10px; white-space: nowrap; }
.logo b { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; background: var(--grad); color: #16161c; font-size: 13px; }
.nav nav { display: flex; gap: 4px; margin-left: auto; }
.nav nav a { padding: 8px 14px; border-radius: 999px; color: var(--muted); font-size: 14px; font-weight: 500; transition: .2s; }
.nav nav a:hover { color: var(--text); background: var(--card); }
@media (max-width: 820px) { .nav nav { display: none; } .nav .btn { margin-left: auto; } }

/* ---------- nút ---------- */
.btn { position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 13px 22px; border-radius: 999px; border: 1px solid var(--line-2); background: var(--card-2); font-weight: 600; font-size: 15px; cursor: pointer; overflow: hidden; transition: transform .2s, box-shadow .2s, background .2s; white-space: nowrap; }
.btn:hover { transform: translateY(-2px); background: #333342; }
.btn:active { transform: scale(.97); }
.btn-hot { background: var(--grad-loop); background-size: 200% 100%; color: #16161c; border: 0; box-shadow: 0 10px 30px -10px var(--pink); animation: slide 6s linear infinite; }
.btn-hot:hover { background: var(--grad-loop); background-size: 200% 100%; box-shadow: 0 16px 40px -8px var(--pink); }
.btn-hot::after { content: ""; position: absolute; inset: 0; background: linear-gradient(100deg, transparent 30%, rgba(255,255,255,.55) 50%, transparent 70%); transform: translateX(-120%); animation: shine 3.2s ease-in-out infinite; }
.btn-ghost { background: transparent; }
.btn-sm { padding: 8px 14px; font-size: 13px; }
.btn-block { width: 100%; }
.btn:disabled { opacity: .4; pointer-events: none; animation: none; }
.linkbtn { background: none; border: 0; padding: 0; color: var(--brand); cursor: pointer; font-family: var(--mono); font-size: 12px; text-decoration: underline dotted; text-underline-offset: 3px; }
@keyframes shine { 60%, 100% { transform: translateX(120%); } }
@keyframes slide { to { background-position: 200% 0; } }

/* ---------- hero ---------- */
.hero { padding: 84px 0 40px; text-align: center; position: relative; }
.eyebrow { display: inline-flex; gap: 10px; align-items: center; padding: 7px 15px; border-radius: 999px; border: 1px solid var(--line-2); background: rgba(255,255,255,.04); font: 500 12px var(--mono); letter-spacing: .06em; color: var(--muted); text-transform: uppercase; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--lime); animation: ping 1.8s infinite; }
@keyframes ping { 0% { box-shadow: 0 0 0 0 rgba(184,242,107,.7); } 70%, 100% { box-shadow: 0 0 0 10px transparent; } }
h1 { font: 800 clamp(42px, 7.5vw, 88px)/1.02 var(--head); letter-spacing: -.04em; margin: 22px auto 18px; max-width: 13ch; }
.grad-text { background: var(--grad-loop); background-size: 200% auto; -webkit-background-clip: text; background-clip: text; color: transparent; animation: slide 5s linear infinite; }
.lead { color: var(--muted); font-size: clamp(16px, 2vw, 19px); max-width: 640px; margin: 0 auto 30px; }
.cta-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 56px; }
.stat { padding: 20px; border-radius: 20px; background: rgba(255,255,255,.035); border: 1px solid var(--line); text-align: left; }
.stat b { display: block; font: 800 36px var(--head); letter-spacing: -.02em; }
.stat span { color: var(--muted); font-size: 13px; }
@media (max-width: 720px) { .stats { grid-template-columns: repeat(2, 1fr); } }
.sticker { position: absolute; padding: 8px 14px; border-radius: 14px; font: 700 13px var(--head); background: var(--card); border: 1px solid var(--line-2); box-shadow: 0 12px 30px -12px rgba(0,0,0,.7); animation: bob 5s ease-in-out infinite; }
.sticker.s1 { top: 110px; left: 3%; rotate: -8deg; color: var(--lime); }
.sticker.s2 { top: 190px; right: 4%; rotate: 7deg; color: var(--amber); animation-delay: -2s; }
.sticker.s3 { top: 360px; left: 7%; rotate: 5deg; color: var(--pink); animation-delay: -3.5s; }
.sticker.s4 { top: 330px; right: 8%; rotate: -5deg; color: var(--brand); animation-delay: -1s; }
@keyframes bob { 50% { transform: translateY(-12px); } }
@media (max-width: 1100px) { .sticker { display: none; } }

/* ---------- băng chạy ---------- */
.marquee { border-block: 1px solid var(--line); background: rgba(255,255,255,.025); overflow: hidden; padding: 14px 0; rotate: -1.2deg; margin: 24px -20px; }
.marquee .track { display: flex; width: max-content; animation: marq 34s linear infinite; font: 700 15px var(--head); color: var(--muted); }
.marquee .track span { padding-right: 44px; white-space: nowrap; }
.marquee .track span::before { content: "✦"; color: var(--pink); margin-right: 44px; }
@keyframes marq { to { transform: translateX(-50%); } }

/* ---------- section ---------- */
section { padding: 96px 0; }
.kicker { font: 600 12px var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--brand); }
h2 { font: 800 clamp(30px, 4.6vw, 54px)/1.08 var(--head); letter-spacing: -.03em; margin: 12px 0 14px; }
.sub { color: var(--muted); max-width: 640px; }
.hint { color: var(--dim); font-size: 13px; margin-top: 12px; }

/* ---------- toggle cách trả ---------- */
.toggle { position: relative; display: inline-grid; grid-template-columns: 1fr 1fr; padding: 5px; border-radius: 999px; background: var(--card); border: 1px solid var(--line-2); margin-top: 34px; }
.toggle button { position: relative; z-index: 1; border: 0; background: none; padding: 11px 22px; border-radius: 999px; font-weight: 700; font-size: 14px; cursor: pointer; color: var(--muted); transition: color .25s; display: flex; gap: 8px; align-items: center; justify-content: center; }
.toggle button.on { color: #16161c; }
.toggle .pill { position: absolute; top: 5px; bottom: 5px; left: 5px; width: calc(50% - 5px); border-radius: 999px; background: var(--grad); transition: transform .4s cubic-bezier(.6,-.3,.3,1.4); }
.toggle[data-mode="once"] .pill { transform: translateX(100%); }
.tag { font: 800 10px var(--mono); padding: 3px 7px; border-radius: 999px; background: var(--lime); color: #16161c; letter-spacing: .04em; vertical-align: middle; }

/* ---------- thẻ giá ---------- */
@property --ang { syntax: '<angle>'; initial-value: 0deg; inherits: false; }
.plans { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 44px; text-align: left; }
@media (max-width: 1100px) { .plans { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .plans { grid-template-columns: 1fr; } }
.plan { position: relative; padding: 28px; border-radius: 24px; background: var(--card); border: 1px solid var(--line); display: flex; flex-direction: column; gap: 14px; transition: transform .25s ease-out, border-color .25s; will-change: transform; }
.plan:hover { border-color: var(--line-2); }
.plan.hot { background: linear-gradient(var(--card), var(--card)) padding-box, conic-gradient(from var(--ang), var(--brand), var(--pink), var(--amber), var(--brand)) border-box; border: 2px solid transparent; animation: spin 5s linear infinite; box-shadow: 0 30px 60px -30px rgba(255,111,181,.5); }
@keyframes spin { to { --ang: 360deg; } }
.ribbon { position: absolute; top: -13px; right: 22px; padding: 5px 12px; border-radius: 999px; background: var(--grad); color: #16161c; font: 800 11px var(--mono); letter-spacing: .08em; }
.plan h3 { font: 700 13px var(--mono); letter-spacing: .12em; color: var(--muted); text-transform: uppercase; }
.price { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.price b { font: 800 clamp(42px, 4.2vw, 52px)/1 var(--head); letter-spacing: -.03em; }
.price s { color: var(--dim); font-size: 18px; }
.price span { color: var(--muted); }
.plan .note { color: var(--lime); font-size: 14px; font-weight: 600; }
.plan ul { list-style: none; padding: 0; display: grid; gap: 9px; color: var(--muted); font-size: 14px; flex: 1; }
.plan li { display: flex; gap: 10px; }
.plan li::before { content: "✓"; color: var(--brand); font-weight: 800; }
.flip { animation: flip .45s ease both; }
.flip:nth-child(2) { animation-delay: .06s; }
.flip:nth-child(3) { animation-delay: .12s; }
.flip:nth-child(4) { animation-delay: .18s; }
@keyframes flip { from { opacity: 0; transform: translateY(16px) scale(.97); } }
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 26px; text-align: left; }
.compare > div { padding: 22px; border-radius: 20px; background: rgba(255,255,255,.03); border: 1px dashed var(--line-2); }
.compare h4 { font: 700 17px var(--head); margin-bottom: 8px; }
.compare p { color: var(--muted); font-size: 14px; }
@media (max-width: 720px) { .compare { grid-template-columns: 1fr; } }

/* ---------- form & panel ---------- */
.checkout, .renew { display: grid; grid-template-columns: 1.1fr .9fr; gap: 22px; margin-top: 44px; align-items: start; }
@media (max-width: 900px) { .checkout, .renew { grid-template-columns: 1fr; } }
.panel { padding: 28px; border-radius: 24px; background: var(--card); border: 1px solid var(--line); min-width: 0; }
.field { display: grid; gap: 7px; margin-bottom: 16px; }
.field > label { font: 600 11px var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.input { width: 100%; padding: 13px 16px; border-radius: 14px; background: var(--bg-2); border: 1px solid var(--line-2); outline: none; transition: border-color .2s, box-shadow .2s; }
.input:focus { border-color: var(--brand); box-shadow: 0 0 0 4px rgba(140,140,234,.18); }
.input.err { border-color: var(--bad); animation: shake .35s; }
@keyframes shake { 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 560px) { .row2 { grid-template-columns: 1fr; } }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { padding: 10px 16px; border-radius: 14px; border: 1px solid var(--line-2); background: var(--bg-2); cursor: pointer; font-weight: 700; font-size: 14px; transition: .2s; display: grid; gap: 1px; text-align: left; }
.chip small { color: var(--muted); font-weight: 500; font-size: 12px; }
.chip:hover { border-color: var(--brand); transform: translateY(-1px); }
.chip.on { background: rgba(140,140,234,.16); border-color: var(--brand); box-shadow: 0 0 0 3px rgba(140,140,234,.15); }
.check { display: flex; gap: 10px; align-items: center; color: var(--muted); font-size: 14px; cursor: pointer; margin: 4px 0 18px; }
.check input { accent-color: var(--brand); width: 18px; height: 18px; }
.lookup { display: flex; gap: 10px; }
.summary { position: sticky; top: 88px; }
.sum-line { display: flex; justify-content: space-between; gap: 12px; padding: 11px 0; border-bottom: 1px dashed var(--line-2); color: var(--muted); font-size: 14px; }
.sum-line b { color: var(--text); text-align: right; }
.total { display: flex; justify-content: space-between; align-items: baseline; margin: 18px 0; color: var(--muted); }
.total b { font: 800 38px var(--head); letter-spacing: -.02em; color: var(--text); }

/* ---------- thanh toán / QR ---------- */
.qr-box { display: none; text-align: center; }
.qr-box.show { display: block; animation: pop .5s cubic-bezier(.2,1.4,.4,1); }
@keyframes pop { from { opacity: 0; transform: scale(.92); } }
.qr-img { width: 100%; max-width: 280px; border-radius: 18px; background: #fff; padding: 8px; margin: 16px auto; display: block; box-shadow: 0 20px 50px -20px var(--brand); }
.kv { display: grid; gap: 8px; text-align: left; margin-top: 12px; }
.kv > div { display: grid; grid-template-columns: 84px 1fr auto; align-items: center; gap: 10px; padding: 10px 14px; border-radius: 12px; background: var(--bg-2); font-size: 14px; }
.kv > div > b:last-child { grid-column: 2 / -1; }
.kv span { color: var(--muted); }
.kv b { font-family: var(--mono); font-weight: 600; overflow-wrap: anywhere; text-align: right; }
.copy { border: 0; background: var(--card-2); border-radius: 8px; padding: 4px 9px; font-size: 12px; cursor: pointer; color: var(--muted); }
.copy:hover { color: var(--text); background: var(--brand); color: #16161c; }
.status { display: inline-flex; align-items: center; gap: 8px; padding: 6px 12px; border-radius: 999px; font: 700 12px var(--mono); letter-spacing: .06em; }
.status.wait { background: rgba(251,191,36,.12); color: var(--warn); }
.status.ok { background: rgba(74,222,128,.12); color: var(--ok); }
.status.bad { background: rgba(248,113,113,.12); color: var(--bad); }
.spinner { width: 12px; height: 12px; border-radius: 50%; border: 2px solid currentColor; border-right-color: transparent; animation: rot .8s linear infinite; }
@keyframes rot { to { transform: rotate(360deg); } }
.success-title { font: 800 28px var(--head); margin: 16px 0 4px; }
.keybox { font: 700 clamp(18px, 3vw, 24px) var(--mono); letter-spacing: .06em; padding: 18px; border-radius: 16px; background: var(--bg-2); border: 2px dashed var(--ok); margin: 14px 0; overflow-wrap: anywhere; }
.empty { padding: 22px; border-radius: 16px; border: 1px dashed var(--line-2); color: var(--muted); text-align: center; font-size: 14px; }

/* ---------- gia hạn ---------- */
.lic { display: none; margin-top: 8px; }
.lic.show { display: block; animation: pop .45s cubic-bezier(.2,1.4,.4,1); }
.lic-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.bar { height: 10px; border-radius: 999px; background: var(--bg-2); overflow: hidden; margin: 14px 0 4px; }
.bar i { display: block; width: 0; height: 100%; border-radius: inherit; background: var(--grad); transition: width .9s cubic-bezier(.2,.9,.3,1); }
.setting { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 16px; border-radius: 16px; background: var(--bg-2); margin-top: 16px; }
.setting p { color: var(--muted); font-size: 13px; }
.switch { position: relative; width: 52px; height: 30px; flex: none; }
.switch input { position: absolute; inset: 0; opacity: 0; cursor: pointer; z-index: 1; margin: 0; }
.switch span { position: absolute; inset: 0; border-radius: 999px; background: var(--card-2); border: 1px solid var(--line-2); transition: .25s; }
.switch span::after { content: ""; position: absolute; top: 3px; left: 3px; width: 22px; height: 22px; border-radius: 50%; background: var(--muted); transition: .35s cubic-bezier(.5,1.6,.4,1); }
.switch input:checked + span { background: var(--brand); }
.switch input:checked + span::after { transform: translateX(22px); background: #fff; }
.newexp { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; padding: 16px; border-radius: 16px; background: rgba(184,242,107,.08); border: 1px solid rgba(184,242,107,.25); margin-top: 16px; font: 600 15px var(--mono); }
.newexp .arrow { color: var(--lime); font-size: 20px; }
.newexp b { color: var(--lime); }

/* ---------- quản trị ---------- */
.notice { padding: 14px 18px; border-radius: 14px; background: rgba(251,191,36,.08); border: 1px solid rgba(251,191,36,.25); color: #fde68a; font-size: 14px; margin-top: 18px; }
.acc-list { display: grid; gap: 12px; margin-top: 14px; }
.acc { display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: center; padding: 16px; border-radius: 18px; background: var(--bg-2); border: 1px solid var(--line); }
.acc.def { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(140,140,234,.12); }
.acc .bank { width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center; font: 800 12px var(--head); background: var(--grad); color: #16161c; }
.acc h4 { font: 700 15px var(--head); display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.acc p { color: var(--muted); font: 500 13px var(--mono); overflow-wrap: anywhere; }
.acc .acts { grid-column: 1 / -1; display: flex; gap: 6px; flex-wrap: wrap; }
.qr-preview { margin-top: 18px; text-align: center; }
.qr-preview img { width: 220px; max-width: 100%; border-radius: 14px; background: #fff; padding: 8px; }
.tbl-wrap { overflow-x: auto; }
.tbl { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 720px; }
.tbl th { font: 600 11px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); text-align: left; padding: 10px; border-bottom: 1px solid var(--line-2); }
.tbl td { padding: 12px 10px; border-bottom: 1px solid var(--line); vertical-align: middle; }
.tbl small { color: var(--muted); }

/* ---------- CMS (trang Quản trị) ---------- */
.cms-tabs { display: flex; flex-wrap: wrap; gap: 8px; padding-top: 28px; }
.cms-tabs button { padding: 10px 16px; border-radius: 999px; border: 1px solid var(--line-2); background: var(--card); font-weight: 700; font-size: 14px; cursor: pointer; transition: .2s; }
.cms-tabs button:hover { border-color: var(--brand); }
.cms-tabs button.on { background: var(--grad); color: #16161c; border-color: transparent; }
.cms-list { display: grid; gap: 14px; margin-top: 24px; justify-items: start; }
.cms-item { width: 100%; padding: 18px; border-radius: 18px; background: var(--card); border: 1px solid var(--line); }
.cms-item-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 14px; }
.cms-item-head b { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font: 700 15px var(--head); }
.cms-item-head span { display: flex; gap: 6px; flex: none; }
.cms-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 0 14px; }
.cms-grid .wide { grid-column: 1 / -1; }
.cms-media { display: flex; gap: 8px; align-items: center; }
.cms-media .input { flex: 1; min-width: 0; }
.cms-thumb { flex: none; width: 88px; aspect-ratio: 16 / 9; border-radius: 8px; object-fit: cover; background: #000; border: 1px solid var(--line); }
.cms-h3 { font: 800 22px var(--head); margin: 36px 0 0; }
textarea.input { resize: vertical; min-height: 84px; line-height: 1.5; }
.cms-bar { position: sticky; bottom: 16px; z-index: 5; display: flex; flex-wrap: wrap; gap: 10px; justify-content: flex-end; align-items: center; margin-top: 22px; padding: 12px; border-radius: 18px; background: rgba(20,20,25,.9); backdrop-filter: blur(10px); border: 1px solid var(--line-2); }
.cms-bar .hint { margin: 0 auto 0 4px; }
@media (max-width: 640px) { .cms-bar { position: static; } .cms-bar .hint { flex-basis: 100%; } }
code { font-family: var(--mono); font-size: .9em; padding: 1px 6px; border-radius: 6px; background: var(--card-2); }

/* ---------- trang chính sách / điều khoản ---------- */
.prose { max-width: 780px; padding: 56px 0 80px; }
.prose h1 { max-width: none; margin: 12px 0 6px; font-size: clamp(32px, 5vw, 48px); }
.prose h2 { margin: 34px 0 10px; font-size: 22px; }
.prose p, .prose li { color: var(--muted); }
.prose ul { padding-left: 22px; display: grid; gap: 6px; }
.prose a { color: var(--brand); text-decoration: underline; text-underline-offset: 3px; }
.draft { margin-top: 16px; padding: 12px 16px; border-radius: 12px; background: rgba(251,191,36,.1); border: 1px solid rgba(251,191,36,.3); color: #fde68a !important; font-size: 14px; }

/* ---------- footer, toast, reveal ---------- */
footer { padding: 40px 0 60px; border-top: 1px solid var(--line); color: var(--dim); font-size: 13px; }
footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
footer a { color: var(--muted); }
.toast { position: fixed; left: 50%; bottom: 24px; padding: 12px 18px; border-radius: 14px; background: var(--text); color: #16161c; font-weight: 600; font-size: 14px; box-shadow: 0 18px 40px -10px rgba(0,0,0,.6); opacity: 0; transform: translate(-50%, 20px); transition: .3s; z-index: 99; pointer-events: none; max-width: calc(100% - 32px); }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s, transform .7s cubic-bezier(.2,.8,.2,1); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}