/* Phong cách "sổ xưởng": giấy ấm, mực đen, một màu cam tín hiệu.
   Mọi màu đều là biến để chế độ tối chỉ cần đổi lại token. */
:root {
  --paper: #f4efe6;
  --paper-2: #ebe4d6;
  --ink: #16140f;
  --ink-soft: #57524a;
  --rule: #cfc6b5;
  --signal: #e2491c;
  --live: #1f8a4c;
  --card: #fbf8f2;
  --serif: "Instrument Serif", Georgia, serif;
  --sans: "Familjen Grotesk", "Helvetica Neue", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --gutter: clamp(16px, 4vw, 48px);
  --max: 1180px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #12110e;
    --paper-2: #1b1915;
    --ink: #efe8da;
    --ink-soft: #a8a194;
    --rule: #34302a;
    --signal: #ff6a3d;
    --live: #3fc07a;
    --card: #191713;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}
/* Lớp hạt giấy rất nhẹ, chỉ để mặt nền không phẳng như template. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .08 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
a { color: inherit; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; }
img { display: block; max-width: 100%; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.mono { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.04em; text-transform: uppercase; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 16px; background: var(--ink); color: var(--paper); padding: 8px 12px; z-index: 10; }

/* Header */
.site-header { border-bottom: 1px solid var(--rule); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 16px; }
.wordmark { display: inline-flex; align-items: center; gap: 10px; font: 400 1.6rem/1 var(--serif); text-decoration: none; }
.wordmark i { width: 12px; height: 12px; background: var(--signal); display: inline-block; transform: rotate(45deg); }
.nav { display: flex; gap: clamp(14px, 3vw, 32px); }
.nav a { text-decoration: none; color: var(--ink-soft); }
.nav a:hover { color: var(--ink); }

/* Hero */
.hero { padding: clamp(56px, 10vw, 128px) 0 clamp(48px, 8vw, 96px); }
.hero .wrap { position: relative; }
.hero .eyebrow { color: var(--signal); }
.hero h1 {
  font: 400 clamp(3rem, 9.5vw, 8.4rem)/0.92 var(--serif);
  letter-spacing: -0.02em;
  margin: 18px 0 0;
  max-width: 11ch;
}
.hero h1 em { color: var(--ink-soft); }
.hero-foot { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 32px; margin-top: 48px; align-items: end; }
.hero-foot p { font-size: 1.15rem; color: var(--ink-soft); max-width: 46ch; margin: 0; }
.facts { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink); }
.facts li { display: flex; justify-content: space-between; gap: 16px; padding: 10px 0; border-bottom: 1px solid var(--rule); }
.facts li span:first-child { color: var(--ink-soft); }

/* Con dấu "FILED": điểm nhớ của trang, gợi lại ngày công ty được cấp phép. */
.stamp {
  position: absolute;
  right: var(--gutter);
  top: 24px;
  border: 3px solid var(--signal);
  color: var(--signal);
  padding: 10px 16px 8px;
  text-align: center;
  transform: rotate(-9deg);
  font-family: var(--mono);
  line-height: 1.25;
  opacity: 0.88;
  mix-blend-mode: multiply;
  animation: stamp 0.5s 0.6s cubic-bezier(0.2, 1.6, 0.4, 1) both;
}
.stamp b { display: block; font-size: 1.7rem; letter-spacing: 0.18em; }
.stamp small { font-size: 0.7rem; letter-spacing: 0.12em; }
@media (prefers-color-scheme: dark) { .stamp { mix-blend-mode: normal; } }
@keyframes stamp { from { opacity: 0; transform: rotate(-9deg) scale(1.6); } }

/* Section heading */
.section { padding: clamp(56px, 8vw, 104px) 0; border-top: 1px solid var(--rule); }
.section-head { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: 24px; margin-bottom: 40px; }
.section-head h2 { font: 400 clamp(2rem, 4.6vw, 3.4rem)/1.02 var(--serif); margin: 0; max-width: 18ch; }
.section-head .mono { color: var(--ink-soft); padding-top: 10px; }

/* Ledger sản phẩm */
.ledger { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink); }
.entry a {
  display: grid;
  grid-template-columns: 64px 56px minmax(0, 1.1fr) minmax(0, 1.4fr) 120px;
  gap: 20px;
  align-items: center;
  padding: 26px 8px;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  transition: background 0.2s;
}
.entry a:hover { background: var(--card); }
.entry .no { color: var(--ink-soft); }
.entry img { width: 48px; height: 48px; border-radius: 12px; }
.entry h3 { font: 400 2rem/1 var(--serif); margin: 0 0 6px; }
.entry .domain { color: var(--ink-soft); }
.entry p { margin: 0; color: var(--ink-soft); }
.entry .status { display: flex; align-items: center; justify-content: flex-end; gap: 8px; }
.entry .status::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--live); box-shadow: 0 0 0 4px color-mix(in srgb, var(--live) 18%, transparent); }
.entry .arrow { display: inline-block; transition: transform 0.2s; }
.entry a:hover .arrow { transform: translateX(4px); color: var(--signal); }
.entry.wip .status::before { background: var(--signal); box-shadow: 0 0 0 4px color-mix(in srgb, var(--signal) 18%, transparent); }
.entry.wip .glyph { width: 48px; height: 48px; border: 1.5px dashed var(--ink-soft); border-radius: 12px; display: grid; place-items: center; font: 1.4rem var(--serif); }

/* Chuỗi xuất hiện duy nhất của trang: các dòng sổ hiện lần lượt. */
@media (prefers-reduced-motion: no-preference) {
  .entry { animation: rise 0.6s cubic-bezier(0.2, 0.7, 0.2, 1) both; animation-delay: calc(var(--i) * 90ms + 200ms); }
  @keyframes rise { from { opacity: 0; transform: translateY(14px); } }
}
@media (prefers-reduced-motion: reduce) { .stamp { animation: none; } html { scroll-behavior: auto; } }

/* Nguyên tắc */
.principles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border-top: 1px solid var(--ink); }
.principles article { padding: 28px 28px 8px 0; border-right: 1px solid var(--rule); }
.principles article + article { padding-left: 28px; }
.principles article:last-child { border-right: 0; }
.principles h3 { font: 400 1.7rem/1.1 var(--serif); margin: 12px 0 10px; }
.principles p { color: var(--ink-soft); margin: 0; }
.principles .mono { color: var(--signal); }

/* Công ty + liên hệ */
.company { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(32px, 6vw, 80px); }
.company p { color: var(--ink-soft); max-width: 52ch; }
.card { align-self: start; background: var(--card); border: 1px solid var(--rule); padding: 28px; }
.card dl { margin: 0; display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 10px 20px; }
.card dt { color: var(--ink-soft); }
.card dd { margin: 0; }
.mail {
  display: inline-block;
  margin-top: 24px;
  font: 400 clamp(1.6rem, 4vw, 2.6rem)/1 var(--serif);
  text-decoration: none;
  border-bottom: 2px solid var(--signal);
  overflow-wrap: anywhere;
}
.mail:hover { color: var(--signal); }

/* Footer */
.site-footer { border-top: 1px solid var(--ink); padding: 28px 0 40px; color: var(--ink-soft); }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 24px; }
.site-footer nav { display: flex; gap: 20px; }

/* Trang văn bản (Privacy, Terms, 404) */
.doc { padding: clamp(48px, 8vw, 96px) 0; max-width: 72ch; }
.doc h1 { font: 400 clamp(2.6rem, 7vw, 4.6rem)/1 var(--serif); margin: 12px 0 8px; }
.doc h2 { font: 400 1.7rem/1.2 var(--serif); margin: 40px 0 8px; }
.doc p, .doc li { color: var(--ink-soft); }
.doc .mono { color: var(--signal); }

@media (max-width: 860px) {
  .hero-foot, .company, .section-head { grid-template-columns: minmax(0, 1fr); }
  .section-head { gap: 8px; }
  .stamp { position: static; width: max-content; margin: 8px 0 32px 20px; }
  .entry a { grid-template-columns: 48px minmax(0, 1fr) auto; gap: 8px 16px; }
  .entry .no { display: none; }
  .entry img, .entry.wip .glyph { width: 44px; height: 44px; }
  .entry p { grid-column: 1 / -1; }
  .entry .status { grid-row: 1; grid-column: 3; }
  .principles { grid-template-columns: minmax(0, 1fr); }
  .principles article, .principles article + article { padding: 24px 0; border-right: 0; border-bottom: 1px solid var(--rule); }
}
@media (max-width: 520px) {
  .nav a:not(:last-child) { display: none; }
  .entry h3 { font-size: 1.6rem; }
}

/* Phần riêng cho Privacy/Terms: mục lục, bảng nhà cung cấp, địa chỉ. */
.doc .lede { font-size: 1.12rem; color: var(--ink); }
.doc h2 { scroll-margin-top: 24px; }
.doc h3 { font: 500 1rem/1.4 var(--sans); margin: 24px 0 4px; }
.doc ul { padding-left: 1.2em; }
.doc li { margin: 6px 0; }
.doc strong { color: var(--ink); font-weight: 500; }
.toc { border-top: 1px solid var(--ink); border-bottom: 1px solid var(--rule); padding: 20px 0; margin: 32px 0 8px; }
.toc ol { columns: 2; column-gap: 32px; margin: 12px 0 0; padding-left: 1.4em; }
.toc li { margin: 4px 0; break-inside: avoid; }
.toc a { text-decoration: none; color: var(--ink-soft); }
.toc a:hover { color: var(--signal); }
.table-wrap { overflow-x: auto; }
.doc table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 0.95rem; }
.doc th, .doc td { text-align: left; padding: 10px 12px 10px 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
.doc th { font: 400 0.75rem/1 var(--mono); text-transform: uppercase; letter-spacing: 0.04em; color: var(--ink-soft); border-bottom-color: var(--ink); }
.doc td { color: var(--ink-soft); }
.doc td:first-child { color: var(--ink); white-space: nowrap; }
.doc address { font-style: normal; color: var(--ink-soft); line-height: 1.8; }
@media (max-width: 600px) { .toc ol { columns: 1; } }