/* Con Kiến · The Ant · "Capture The Vibe"
   Hai theme: dark (mặc định) và light. Chỉ vàng đồng + nâu, đường kẻ mảnh, serif cho tiêu đề. */
:root {
  --font-display: "Playfair Display", "Be Vietnam Pro", Georgia, "Times New Roman", serif;
  --font-body: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --gold: #e0aa4b;
  --gold-deep: #b8761f;
  --gold-grad: linear-gradient(135deg, #8a5a2b 0%, #e8b04f 52%, #b8761f 100%);
  --on-gold: #1a1109;
}
:root, [data-theme="dark"] {
  --bg: #0d0906;
  --surface: #17100b;
  --surface-2: #1f1610;
  --band: #130d08;
  --band-text: #f3ead8;
  --text: #f3ead8;
  --muted: #b9aa91;
  --accent: #e8b04f;
  --line: rgba(232, 176, 79, .24);
  --line-strong: rgba(232, 176, 79, .5);
  --input: #0d0906;
  --glow: radial-gradient(60% 70% at 85% 10%, rgba(224, 170, 75, .18), transparent 70%);
  --shadow: 0 30px 60px -28px rgba(0, 0, 0, .8);
  color-scheme: dark;
}
[data-theme="light"] {
  --bg: #faf5ea;
  --surface: #fffdf8;
  --surface-2: #f1e8d3;
  --band: #2b1a0e;
  --band-text: #f6edd9;
  --text: #1f150d;
  --muted: #6b5a47;
  --accent: #8a5a2b;
  --line: #e0d3b8;
  --line-strong: #b8956a;
  --input: #ffffff;
  --glow: radial-gradient(60% 70% at 85% 10%, rgba(224, 170, 75, .22), transparent 70%);
  --shadow: 0 30px 60px -30px rgba(80, 50, 20, .35);
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; animation: none !important; } }

body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--font-body); font-size: 17px; line-height: 1.65; -webkit-font-smoothing: antialiased; transition: background .25s ease, color .25s ease; }
img, svg { max-width: 100%; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--gold); }
:focus-visible { outline: 2px solid var(--gold); outline-offset: 3px; border-radius: 4px; }

.wrap { width: 100%; max-width: 1120px; margin-inline: auto; padding-inline: clamp(16px, 4vw, 32px); }
h1, h2, h3 { font-family: var(--font-display); margin: 0; text-wrap: balance; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.3rem, 5.2vw, 4rem); font-weight: 700; line-height: 1.08; }
h2 { font-size: clamp(1.8rem, 3.4vw, 2.6rem); font-weight: 700; line-height: 1.12; }
h3 { font-size: 1.2rem; font-weight: 600; line-height: 1.25; }
p { margin: 0; }
.lead { font-size: 1.12rem; color: var(--muted); max-width: 60ch; }
.eyebrow { font-weight: 600; font-size: .78rem; letter-spacing: .22em; text-transform: uppercase; color: var(--accent); display: flex; align-items: center; gap: 12px; }
.eyebrow::before { content: ""; width: 28px; height: 1px; background: var(--gold); }

/* header */
.site-header { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 76px; flex-wrap: wrap; padding-block: 8px; }
.brand { display: flex; align-items: center; text-decoration: none; }
.brand img { height: 62px; width: auto; display: block; }
.nav { display: flex; align-items: center; gap: clamp(10px, 2vw, 24px); flex-wrap: wrap; font-size: .92rem; letter-spacing: .02em; }
.nav a { text-decoration: none; color: var(--text); }
.nav a:hover { color: var(--gold); }
.lang, .theme-toggle { border: 1px solid var(--line-strong); background: transparent; color: var(--text); font: inherit; font-size: .78rem; font-weight: 600; letter-spacing: .08em; padding: 5px 12px; border-radius: 999px; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; gap: 6px; min-height: 34px; }
.lang:hover, .theme-toggle:hover { border-color: var(--gold); color: var(--gold); }
.theme-toggle svg { width: 15px; height: 15px; }
[data-theme="dark"] .ico-moon, [data-theme="light"] .ico-sun { display: none; }

/* theme-aware logos */
[data-theme="dark"] .logo-light, [data-theme="light"] .logo-dark { display: none; }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 50px; padding: 10px 26px; border-radius: 999px; font-weight: 600; letter-spacing: .02em; text-decoration: none; border: 1px solid transparent; transition: transform .15s ease, box-shadow .2s ease, border-color .2s ease; cursor: pointer; font-family: var(--font-body); font-size: 1rem; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--gold-grad); color: var(--on-gold); box-shadow: 0 12px 28px -12px rgba(224, 170, 75, .7); }
.btn-primary:hover { color: var(--on-gold); box-shadow: 0 16px 34px -12px rgba(224, 170, 75, .9); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--line-strong); }
.btn-ghost:hover { border-color: var(--gold); color: var(--gold); }
.btn-sm { min-height: 40px; padding: 6px 18px; font-size: .88rem; }

/* hero */
.hero { padding-block: clamp(40px, 7vw, 88px) clamp(36px, 6vw, 72px); background: var(--glow); }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: clamp(28px, 5vw, 64px); align-items: center; }
.slogan { font-weight: 600; letter-spacing: .34em; text-transform: uppercase; font-size: .78rem; color: var(--accent); margin-bottom: 18px; display: flex; align-items: center; gap: 14px; }
.slogan::before { content: ""; width: 44px; height: 1px; background: var(--gold); }
.hero h1 em { font-style: italic; background: var(--gold-grad); -webkit-background-clip: text; background-clip: text; color: transparent; padding-right: .06em; }
.hero .lead { margin-top: 22px; }
.cta-row { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 30px; }
.channels { margin-top: 24px; font-size: .85rem; letter-spacing: .06em; color: var(--muted); }

.phone { background: var(--surface); color: var(--text); border-radius: 22px; padding: 20px; border: 1px solid var(--line-strong); box-shadow: var(--shadow); }
.phone-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding-bottom: 12px; border-bottom: 1px solid var(--line); font-size: .85rem; }
.phone-head strong { font-family: var(--font-display); font-size: 1.05rem; }
.tag { font-size: .68rem; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); }
.chat { display: flex; flex-direction: column; gap: 10px; padding-top: 14px; }
.msg { max-width: 88%; padding: 10px 14px; border-radius: 16px; font-size: .95rem; line-height: 1.5; }
.msg time { display: block; font-size: .7rem; opacity: .6; margin-bottom: 2px; }
.msg.cus { align-self: flex-start; background: var(--surface-2); border: 1px solid var(--line); border-bottom-left-radius: 4px; }
.msg.bot { align-self: flex-end; background: var(--gold-grad); color: var(--on-gold); border-bottom-right-radius: 4px; }
.handover { align-self: center; font-size: .75rem; font-weight: 600; letter-spacing: .04em; color: var(--accent); border: 1px solid var(--line-strong); padding: 5px 14px; border-radius: 999px; }

/* sections */
section { padding-block: clamp(48px, 7vw, 96px); }
section.alt { background: var(--surface-2); border-block: 1px solid var(--line); }
.section-head { display: grid; gap: 14px; margin-bottom: clamp(26px, 4vw, 48px); }
.dark { background: var(--band); color: var(--band-text); border-block: 1px solid var(--line); }
.dark .eyebrow { color: var(--gold); }
.dark .lead { color: color-mix(in srgb, var(--band-text) 72%, transparent); }
.dark a { color: var(--gold); }

.trail { list-style: none; margin: 0; padding: 0; position: relative; display: grid; gap: 30px; }
.trail::before { content: ""; position: absolute; left: 21px; top: 8px; bottom: 8px; border-left: 1px dashed var(--gold); }
.trail li { position: relative; padding-left: 68px; }
.trail .n { position: absolute; left: 0; top: 0; width: 44px; height: 44px; border-radius: 50%; background: var(--band); color: var(--gold); border: 1px solid var(--gold); display: grid; place-items: center; font-family: var(--font-display); font-weight: 700; }
.trail h3 { margin-bottom: 6px; }
.trail p { color: color-mix(in srgb, var(--band-text) 80%, transparent); max-width: 62ch; }

.grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 24px; display: grid; gap: 10px; align-content: start; transition: border-color .2s ease, transform .2s ease; }
.card:hover { border-color: var(--line-strong); transform: translateY(-3px); }
.card p { color: var(--muted); font-size: .96rem; }

/* uy tín */
.trust { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line-strong); border-radius: 16px; overflow: hidden; background: var(--surface); }
.trust div { padding: 26px 22px; border-right: 1px solid var(--line); display: grid; gap: 8px; align-content: start; }
.trust div:last-child { border-right: none; }
.trust strong { font-family: var(--font-display); font-size: 1.5rem; line-height: 1.15; background: var(--gold-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.trust span { color: var(--muted); font-size: .93rem; }

/* giá */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: stretch; }
.plan { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 28px; display: grid; gap: 14px; align-content: start; }
.plan.hot { border-color: var(--gold); box-shadow: 0 24px 50px -28px rgba(224, 170, 75, .55); position: relative; }
.price { font-family: var(--font-display); font-weight: 700; font-size: 2.1rem; letter-spacing: -0.01em; font-variant-numeric: tabular-nums; }
.price small { font-family: var(--font-body); font-weight: 500; font-size: .85rem; color: var(--muted); letter-spacing: 0; }
.plan ul { margin: 0; padding-left: 1.1em; color: var(--muted); font-size: .96rem; display: grid; gap: 6px; }
.plan ul li::marker { color: var(--gold); }
.fine { margin-top: 20px; font-size: .9rem; color: var(--muted); max-width: 70ch; }

.case { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(24px, 4vw, 56px); align-items: start; }
.case ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.case li { padding: 16px 18px; border: 1px solid var(--line-strong); border-radius: 12px; }

/* faq */
details { border-top: 1px solid var(--line-strong); padding: 18px 0; }
details:last-of-type { border-bottom: 1px solid var(--line-strong); }
summary { cursor: pointer; font-family: var(--font-display); font-weight: 600; font-size: 1.15rem; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; font-size: 1.5rem; line-height: 1; color: var(--gold); }
details[open] summary::after { content: "−"; }
details p { margin-top: 10px; color: var(--muted); max-width: 70ch; }

/* liên hệ */
.cta-band { background: var(--gold-grad); color: var(--on-gold); border-block: 1px solid var(--gold-deep); }
.cta-band .inner { display: grid; grid-template-columns: 1.3fr 1fr; gap: 24px; align-items: center; }
.cta-band h2 { color: var(--on-gold); }
.cta-band .btn-primary { background: #120c07; color: #f6e7c4; box-shadow: none; }
.contact-lines { display: grid; gap: 6px; font-weight: 600; }
.contact-lines a { color: var(--on-gold); }

/* footer */
.site-footer { padding-block: 40px; font-size: .9rem; color: var(--muted); border-top: 1px solid var(--line); }
.site-footer .cols { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.site-footer address { font-style: normal; max-width: 52ch; }
.site-footer nav { display: grid; gap: 8px; align-content: start; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--gold); }
.site-footer strong { color: var(--text); }
.logo-foot { height: 92px; width: auto; display: block; margin-bottom: 14px; }

/* trang văn bản */
.doc { padding-block: clamp(32px, 5vw, 64px); }
.doc .wrap { max-width: 800px; }
.doc h1 { font-size: clamp(1.9rem, 4vw, 2.8rem); margin-bottom: 8px; }
.doc h2 { font-size: 1.35rem; margin-top: 34px; margin-bottom: 8px; }
.doc p, .doc li { color: var(--text); opacity: .92; }
.doc ul, .doc ol { padding-left: 1.2em; display: grid; gap: 4px; }
.doc .meta { color: var(--muted); font-size: .92rem; margin-bottom: 20px; }
.doc hr { border: none; border-top: 1px dashed var(--gold); margin: 48px 0 8px; }
.doc .en-title { font-family: var(--font-display); font-weight: 700; font-size: 1.7rem; margin-top: 12px; }

/* đặt hàng */
.dh-form { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 20px; background: var(--surface); border: 1px solid var(--line-strong); border-radius: 18px; padding: clamp(18px, 3vw, 32px); box-shadow: var(--shadow); }
.dh-form label { display: grid; gap: 6px; font-weight: 500; font-size: .9rem; color: var(--muted); }
.dh-form .wide { grid-column: 1 / -1; }
.dh-form input, .dh-form select { font: inherit; min-height: 48px; padding: 8px 14px; border: 1px solid var(--line-strong); border-radius: 10px; background: var(--input); color: var(--text); }
.dh-form input:focus, .dh-form select:focus { outline: 2px solid var(--gold); outline-offset: 1px; border-color: var(--gold); }
.dh-form .check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; }
.dh-form .check input { min-height: 0; width: 20px; height: 20px; margin-top: 3px; flex: none; accent-color: var(--gold); }
.dh-out { margin-top: 26px; background: var(--surface); border: 1px solid var(--gold); border-radius: 18px; padding: clamp(18px, 3vw, 32px); }
.dh-grid { display: grid; grid-template-columns: 240px 1fr; gap: 24px; align-items: start; margin-block: 16px; }
.dh-qr { width: 100%; max-width: 240px; height: auto; border: 6px solid #fff; border-radius: 10px; background: #fff; }
.dh-table { width: 100%; border-collapse: collapse; font-size: .95rem; }
.dh-table th, .dh-table td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.dh-table th { width: 40%; color: var(--muted); font-weight: 500; }
.phieu { display: none; }

@media (max-width: 900px) {
  .hero-grid, .case, .cta-band .inner { grid-template-columns: 1fr; }
  .grid4 { grid-template-columns: repeat(2, 1fr); }
  .trust { grid-template-columns: repeat(2, 1fr); }
  .trust div:nth-child(2) { border-right: none; }
  .trust div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .plans { grid-template-columns: 1fr; }
}
@media (max-width: 700px) { .dh-form { grid-template-columns: 1fr; } .dh-grid { grid-template-columns: 1fr; } }
@media (max-width: 520px) {
  body { font-size: 16px; }
  .grid4, .trust { grid-template-columns: 1fr; }
  .trust div { border-right: none; border-bottom: 1px solid var(--line); }
  .trust div:last-child { border-bottom: none; }
  .brand img { height: 52px; }
}
@media print {
  html, body { background: #fff !important; color: #000 !important; }
  body * { visibility: hidden; }
  .phieu, .phieu * { visibility: visible; color: #000; }
  .phieu { display: block; position: absolute; inset: 0 auto auto 0; width: 100%; padding: 24px; font-size: 12pt; }
  .phieu h1 { font-size: 20pt; text-align: center; } .phieu h2 { font-size: 13pt; margin: 14px 0 4px; }
  .phieu .dh-qr { max-width: 160px; margin-top: 10px; }
  .phieu .dh-table th, .phieu .dh-table td { border-bottom: 1px solid #ccc; color: #000; }
}