/* Site public (landing + privacy). Màu theo app: slate + emerald. */
:root {
  --ink: #0f172a;
  --muted: #475569;
  --faint: #94a3b8;
  --line: #e2e8f0;
  --bg: #f8fafc;
  --card: #ffffff;
  --dark: #0f172a;
  --dark-2: #1e293b;
  --accent: #059669;
  --accent-hover: #047857;
  --accent-soft: #ecfdf5;
  --cyan: #06b6d4;
  --radius: 14px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 Inter, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { max-width: 100%; display: block; }
.wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ---------- Nav ---------- */
.nav { position: sticky; top: 0; z-index: 10; background: rgba(248, 250, 252, 0.85); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; font-size: 19px; }
.brand img { width: 32px; height: 32px; }
.brand span { background: linear-gradient(90deg, var(--accent), var(--cyan)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.nav nav { display: flex; align-items: center; gap: 24px; font-size: 15px; font-weight: 500; }
.nav nav a { text-decoration: none; color: var(--muted); }
.nav nav a:hover { color: var(--ink); }
@media (max-width: 720px) { .nav nav a.hide-sm { display: none; } }

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 44px; padding: 0 20px; border-radius: 10px; font-weight: 600; font-size: 15px; text-decoration: none; transition: background 0.15s, color 0.15s, border-color 0.15s; }
.btn-sm { height: 36px; padding: 0 14px; font-size: 14px; }
.nav nav a.btn-primary, .btn-primary { background: var(--accent); color: #fff; }
.nav nav a.btn-primary:hover, .btn-primary:hover { background: var(--accent-hover); color: #fff; }
.btn-ghost { border: 1px solid var(--line); background: var(--card); color: var(--ink); }
.btn-ghost:hover { border-color: var(--faint); }

/* ---------- Hero ---------- */
.hero { padding: 72px 0 56px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
@media (max-width: 960px) { .hero-grid { grid-template-columns: 1fr; gap: 40px; } .hero { padding-top: 48px; } }
.pill { display: inline-block; margin: 0 0 18px; padding: 5px 12px; border-radius: 999px; background: var(--accent-soft); color: var(--accent-hover); font-size: 13px; font-weight: 600; }
h1 { margin: 0; font-size: clamp(36px, 5vw, 54px); line-height: 1.08; letter-spacing: -0.025em; font-weight: 800; }
h1 .accent { background: linear-gradient(90deg, var(--accent), var(--cyan)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { margin: 20px 0 0; font-size: 18px; color: var(--muted); max-width: 540px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.fineprint { margin: 16px 0 0; font-size: 13px; color: var(--faint); }

/* Ảnh minh hoạ giao diện (HTML/CSS, số liệu minh hoạ) */
.preview { margin: 0; }
.window { background: var(--dark); border-radius: 18px; padding: 0 0 18px; box-shadow: 0 30px 60px -20px rgba(15, 23, 42, 0.45); overflow: hidden; }
.window-bar { display: flex; align-items: center; gap: 7px; padding: 14px 18px; border-bottom: 1px solid var(--dark-2); }
.window-bar span { width: 11px; height: 11px; border-radius: 50%; background: #334155; }
.window-bar em { margin-left: 10px; font-style: normal; font-size: 13px; color: var(--faint); }
.window-body { padding: 18px; display: grid; gap: 14px; }
.kpis { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.kpis div { background: var(--dark-2); border-radius: 12px; padding: 12px; }
.kpis small { display: block; font-size: 12px; color: var(--faint); }
.kpis b { display: block; margin-top: 2px; font-size: 20px; color: #f1f5f9; }
.kpis i { font-style: normal; font-size: 12px; color: var(--faint); }
.up { color: #34d399 !important; }
.rows { background: var(--dark-2); border-radius: 12px; padding: 6px 14px; }
.row { display: grid; grid-template-columns: 1fr auto auto; gap: 14px; align-items: center; padding: 9px 0; font-size: 13px; color: #cbd5e1; border-bottom: 1px solid #273449; }
.row:last-child { border-bottom: 0; }
.row em { font-style: normal; color: var(--faint); }
.tag { padding: 2px 8px; border-radius: 999px; font-size: 11px; font-weight: 600; background: #064e3b; color: #6ee7b7; }
.tag.amber { background: #451a03; color: #fcd34d; }
.tag.blue { background: #0c4a6e; color: #7dd3fc; }
.bars { display: flex; align-items: flex-end; gap: 6px; height: 64px; background: var(--dark-2); border-radius: 12px; padding: 12px 14px; }
.bars span { flex: 1; border-radius: 4px 4px 0 0; background: linear-gradient(180deg, #34d399, #059669); }
figcaption { margin-top: 10px; font-size: 12px; color: var(--faint); text-align: right; }

/* ---------- Sections ---------- */
.block { padding: 72px 0; }
.block.alt { background: var(--card); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.kicker { margin: 0 0 8px; font-size: 13px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); }
h2 { margin: 0; font-size: clamp(28px, 3.5vw, 36px); line-height: 1.15; letter-spacing: -0.02em; font-weight: 800; }
.intro { margin: 14px 0 0; max-width: 680px; color: var(--muted); font-size: 17px; }
.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-top: 36px; }
@media (max-width: 720px) { .grid { grid-template-columns: 1fr; } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.block.alt .card { background: var(--bg); }
.card h3 { margin: 14px 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.icon { width: 42px; height: 42px; border-radius: 11px; background: var(--accent-soft); display: grid; place-items: center; }
.icon svg { width: 22px; height: 22px; fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 36px 0 0; padding: 0; list-style: none; counter-reset: step; }
@media (max-width: 860px) { .steps { grid-template-columns: 1fr; } }
.steps li { counter-increment: step; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.steps li::before { content: counter(step); display: grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; background: var(--dark); color: #fff; font-weight: 700; font-size: 14px; }
.steps h3 { margin: 14px 0 6px; font-size: 17px; }
.steps p { margin: 0; color: var(--muted); font-size: 15px; }

.checks { margin: 28px 0 0; padding: 0; list-style: none; display: grid; gap: 12px; max-width: 760px; }
.checks li { position: relative; padding-left: 32px; color: var(--muted); }
.checks li::before { content: ''; position: absolute; left: 0; top: 4px; width: 20px; height: 20px; border-radius: 50%; background: var(--accent-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23059669' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12l5 5L20 7'/%3E%3C/svg%3E") center / 12px no-repeat; }
.checks b { color: var(--ink); font-weight: 600; }

.cta-band { background: var(--dark); color: #f1f5f9; border-radius: 20px; padding: 44px; display: flex; flex-wrap: wrap; gap: 24px; align-items: center; justify-content: space-between; }
.cta-band h2 { color: #fff; font-size: 28px; }
.cta-band p { margin: 8px 0 0; color: var(--faint); }

/* ---------- Footer ---------- */
footer { padding: 36px 0 48px; color: var(--faint); font-size: 14px; }
.foot { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: center; }
.foot nav { display: flex; gap: 20px; }
.foot a { text-decoration: none; color: var(--muted); }
.foot a:hover { color: var(--ink); }

/* ---------- Trang văn bản (privacy) ---------- */
.doc { max-width: 760px; margin: 0 auto; padding: 56px 24px 24px; }
.doc h1 { font-size: clamp(32px, 4vw, 42px); }
.doc .updated { margin: 10px 0 32px; color: var(--faint); font-size: 14px; }
.doc h2 { font-size: 22px; margin: 36px 0 10px; }
.doc p, .doc li { color: var(--muted); }
.doc ul { padding-left: 22px; }
.doc li { margin: 6px 0; }
.doc b { color: var(--ink); font-weight: 600; }
.doc a { color: var(--accent-hover); }