/* Video Studio — trang giới thiệu.
   Hai chất liệu: nền mực xanh đen = màn hình dựng phim, thẻ giấy ngà = trang
   kịch bản. Chữ trên mực dùng grotesque, chữ trên giấy dùng serif. */

:root {
  --ink: #0E1F1E;
  --ink-2: #142B29;
  --ink-3: #1C3A37;
  --paper: #EFE7D6;
  --paper-2: #E1D5BE;
  --paper-3: #CFC0A4;
  --seal: #C7402B;
  --seal-soft: #E0654E;
  --jade: #7FB39D;
  --on-ink: #EAF0EE;
  --dim: #93AAA6;
  --on-paper: #23312F;
  --on-paper-dim: #5C6B68;

  --sans: "Archivo", system-ui, "Segoe UI", sans-serif;
  --serif: "Newsreader", Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;

  --wrap: 1120px;
  --pad: clamp(20px, 5vw, 56px);
  --r: 4px;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--ink);
  color: var(--on-ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; }
a { color: inherit; }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--seal); color: #fff; padding: 10px 16px;
}
.skip:focus { left: 0; }

:focus-visible { outline: 2px solid var(--seal-soft); outline-offset: 3px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding-inline: var(--pad); }

/* ---------- Thanh trên cùng ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 20px;
  padding: 12px var(--pad);
  background: color-mix(in srgb, var(--ink) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--ink-3);
}

.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; margin-right: auto; }
.brand-mark {
  width: 15px; height: 15px; flex: none;
  background: var(--seal);
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
}
.brand-name { font-weight: 800; letter-spacing: -0.02em; font-size: 17px; }

.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav a {
  font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.02em;
  color: var(--dim); text-decoration: none;
  padding: 6px 10px; border-radius: var(--r);
}
.nav a:hover { color: var(--on-ink); background: var(--ink-2); }
.nav a.is-active { color: var(--on-ink); background: var(--ink-3); }

.nav-cta {
  font-size: 14px; font-weight: 600; text-decoration: none;
  padding: 8px 16px; border-radius: var(--r);
  background: var(--seal); color: #fff; white-space: nowrap;
}
.nav-cta:hover { background: var(--seal-soft); }

@media (max-width: 900px) { .nav { display: none; } }

/* ---------- Hero ---------- */
.hero {
  max-width: var(--wrap); margin: 0 auto;
  padding: clamp(48px, 8vw, 104px) var(--pad) clamp(40px, 6vw, 80px);
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(32px, 5vw, 72px);
  align-items: center;
}
@media (max-width: 940px) { .hero { grid-template-columns: 1fr; } }

.eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--jade); margin: 0 0 18px;
}

h1 {
  font-size: clamp(38px, 6.2vw, 66px);
  line-height: 1.02; letter-spacing: -0.035em; font-weight: 900;
  margin: 0 0 22px;
}

.lede { font-size: clamp(16.5px, 1.6vw, 19px); color: var(--dim); margin: 0 0 28px; max-width: 54ch; }
.lede--narrow { max-width: 62ch; }
.lede em { color: var(--on-ink); font-style: italic; }

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-block; text-decoration: none;
  font-weight: 600; font-size: 15.5px;
  padding: 13px 26px; border-radius: var(--r);
  border: 1px solid transparent; transition: background .15s, border-color .15s;
}
.btn-primary { background: var(--seal); color: #fff; }
.btn-primary:hover { background: var(--seal-soft); }
.btn-ghost { border-color: var(--ink-3); color: var(--on-ink); }
.btn-ghost:hover { border-color: var(--dim); background: var(--ink-2); }

.hero-foot { font-family: var(--mono); font-size: 12.5px; color: var(--dim); margin: 20px 0 0; }

/* ---------- Chữ ký: thẻ phụ đề ---------- */
.cue {
  margin: 0;
  background: var(--ink-2);
  border: 1px solid var(--ink-3);
  border-left: 3px solid var(--seal);
  border-radius: var(--r);
  padding: 26px 28px 22px;
}
.cue-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 18px; }
.cue-index {
  font-family: var(--mono); font-size: 12px; font-weight: 600;
  background: var(--ink-3); color: var(--dim);
  padding: 2px 9px; border-radius: 2px;
}
.cue-time { font-family: var(--mono); font-size: 12.5px; color: var(--dim); letter-spacing: 0.01em; }

.cue-src {
  font-size: clamp(19px, 2.2vw, 24px); margin: 0; color: var(--dim);
  line-height: 1.45;
}
.cue-arrow { height: 26px; position: relative; margin: 6px 0; }
.cue-arrow::before {
  content: ""; position: absolute; left: 0; top: 50%;
  width: 34px; height: 1px; background: var(--seal);
}
.cue-arrow::after {
  content: ""; position: absolute; left: 30px; top: 50%;
  width: 5px; height: 5px; transform: translateY(-50%) rotate(45deg);
  border-top: 1px solid var(--seal); border-right: 1px solid var(--seal);
}
.cue-vi {
  font-family: var(--serif);
  font-size: clamp(21px, 2.5vw, 27px); line-height: 1.4;
  margin: 0; color: #fff;
}
.cue-foot {
  font-family: var(--mono); font-size: 11.5px; color: var(--dim);
  margin: 20px 0 0; padding-top: 14px; border-top: 1px solid var(--ink-3);
  letter-spacing: 0.02em;
}

/* Câu Việt hiện ra sau câu Trung, một lần lúc tải trang */
@media (prefers-reduced-motion: no-preference) {
  .cue-src { animation: fadeUp .5s ease both; }
  .cue-arrow { animation: fadeUp .4s ease .45s both; }
  .cue-vi { animation: fadeUp .55s ease .65s both; }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(7px); }
  to { opacity: 1; transform: none; }
}

/* ---------- Dải nội dung ---------- */
.band { padding: clamp(56px, 8vw, 104px) 0; border-top: 1px solid var(--ink-3); }
.band--paper { background: var(--paper); color: var(--on-paper); border-top: none; }

h2 {
  font-size: clamp(27px, 3.6vw, 41px); line-height: 1.12;
  letter-spacing: -0.03em; font-weight: 800; margin: 0 0 20px; max-width: 20ch;
}
h3 { font-size: 18px; font-weight: 700; letter-spacing: -0.015em; margin: 0 0 10px; }

.band--paper .eyebrow { color: var(--seal); }
.band--paper .lede { color: var(--on-paper-dim); }
.band--paper .lede em { color: var(--on-paper); }

/* ---------- Đua tốc độ ---------- */
.race { margin: 36px 0 14px; display: grid; gap: 14px; max-width: 780px; }
.lane { display: grid; grid-template-columns: minmax(0, 15em) 1fr auto; gap: 16px; align-items: center; }
@media (max-width: 720px) { .lane { grid-template-columns: 1fr; gap: 6px; } }

.lane-name { font-size: 14.5px; color: var(--dim); }
.lane-track { display: block; height: 10px; background: var(--ink-2); border-radius: 2px; overflow: hidden; }
.lane-bar { display: block; height: 100%; border-radius: 2px; }
.lane-bar--fast { width: 3.3%; min-width: 4px; background: var(--jade); }
.lane-bar--slow { width: 100%; background: var(--seal); }
.lane-num { font-family: var(--mono); font-size: 14px; font-weight: 600; white-space: nowrap; }

@media (prefers-reduced-motion: no-preference) {
  .lane-bar { transform-origin: left; animation: grow .8s cubic-bezier(.2, .7, .3, 1) both; }
  .lane-bar--slow { animation-delay: .12s; }
}
@keyframes grow { from { transform: scaleX(0); } to { transform: none; } }

.race-note, .note {
  font-size: 14.5px; color: var(--dim); max-width: 68ch;
  border-left: 2px solid var(--ink-3); padding-left: 16px; margin: 18px 0 0;
}
.note { margin-top: 32px; }
.note--tight { margin-top: 18px; }
.band--paper .race-note, .band--paper .note { color: var(--on-paper-dim); border-left-color: var(--paper-3); }

/* ---------- Lưới thẻ ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 40px; }
@media (max-width: 860px) { .grid-3 { grid-template-columns: 1fr; } }

.card { background: var(--ink-2); border: 1px solid var(--ink-3); border-radius: var(--r); padding: 24px; }
.card p { margin: 0; font-size: 15px; color: var(--dim); }

.card--paper { background: #F7F2E7; border-color: var(--paper-2); }
.card--paper p { color: var(--on-paper-dim); font-family: var(--serif); font-size: 16px; }
.card--paper h3 { color: var(--on-paper); }

.out {
  font-family: var(--mono) !important; font-size: 11.5px !important;
  color: var(--seal) !important; letter-spacing: 0.02em;
  margin: 0 0 12px !important;
}
.out code { background: none; padding: 0; color: inherit; font-size: inherit; }

.two-up, .two-col { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(24px, 4vw, 56px); }
.two-up { margin-top: 44px; padding-top: 36px; border-top: 1px solid var(--paper-2); }
@media (max-width: 860px) { .two-up, .two-col { grid-template-columns: 1fr; } }
.two-up p { font-family: var(--serif); color: var(--on-paper-dim); margin: 0; }

/* ---------- Tải về ---------- */
.dl-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 20px; margin-top: 40px; align-items: start; }
@media (max-width: 860px) { .dl-grid { grid-template-columns: 1fr; } }

.dl {
  position: relative;
  background: var(--ink-2); border: 1px solid var(--ink-3);
  border-radius: var(--r); padding: 30px;
}
.dl--main { border-color: color-mix(in srgb, var(--seal) 45%, var(--ink-3)); }
.dl h3 { font-size: 23px; margin-bottom: 4px; }
.dl-for { font-family: var(--mono); font-size: 12px; color: var(--jade); margin: 0 0 20px; letter-spacing: 0.02em; }
.dl ul { margin: 0 0 26px; padding-left: 18px; }
.dl li { font-size: 15px; color: var(--dim); margin-bottom: 9px; }
.dl .btn { width: 100%; text-align: center; }
.dl-meta { font-family: var(--mono); font-size: 12px; color: var(--dim); margin: 14px 0 0; word-break: break-all; }

.sha {
  font-family: var(--mono); font-size: 11.5px; color: var(--dim);
  background: none; border: none; border-bottom: 1px dashed var(--ink-3);
  padding: 4px 0 2px; margin-top: 6px; cursor: pointer; text-align: left;
}
.sha:hover { color: var(--jade); border-bottom-color: var(--jade); }

/* Thông báo gấp, bật bằng runtime-config.json */
.notice {
  background: var(--seal); color: #fff;
  padding: 11px var(--pad); font-size: 14.5px; text-align: center;
}

/* Con dấu son — điểm nhấn duy nhất của trang */
.seal {
  position: absolute; top: -16px; right: 22px;
  width: 62px; height: 62px;
  border: 2px solid var(--seal); border-radius: 3px;
  display: grid; place-items: center;
  transform: rotate(-7deg);
  background: color-mix(in srgb, var(--seal) 12%, var(--ink-2));
}
.seal span {
  font-family: var(--mono); font-size: 10px; font-weight: 600;
  color: var(--seal-soft); text-align: center; line-height: 1.25; letter-spacing: 0.06em;
}

/* ---------- Các bước cài ---------- */
.steps { list-style: none; margin: 40px 0 0; padding: 0; }
.step {
  display: grid; grid-template-columns: 7.5em 1fr; gap: clamp(16px, 3vw, 36px);
  padding: 22px 0; border-top: 1px solid var(--paper-2);
}
.step:last-child { border-bottom: 1px solid var(--paper-2); }
@media (max-width: 700px) { .step { grid-template-columns: 1fr; gap: 8px; } }

.step-time { font-family: var(--mono); font-size: 13px; display: flex; flex-direction: column; gap: 2px; }
.step-time span:first-child { color: var(--on-paper); font-weight: 600; }
.step-dur { color: var(--on-paper-dim); }
@media (max-width: 700px) { .step-time { flex-direction: row; gap: 8px; } }

.step-body p { font-family: var(--serif); font-size: 16.5px; color: var(--on-paper-dim); margin: 0 0 8px; max-width: 62ch; }
.step-body p:last-child { margin-bottom: 0; }
.step-body a { color: var(--seal); text-underline-offset: 3px; }

.step--key .step-body { border-left: 2px solid var(--seal); padding-left: 18px; margin-left: -18px; }
.step-why {
  font-family: var(--sans) !important; font-size: 14px !important;
  color: var(--on-paper-dim); background: #F7F2E7;
  padding: 12px 14px; border-radius: var(--r); margin-top: 12px !important;
}

code {
  font-family: var(--mono); font-size: 0.88em;
  background: color-mix(in srgb, var(--paper-3) 40%, transparent);
  padding: 1px 5px; border-radius: 2px;
}
.band:not(.band--paper) code { background: var(--ink-3); color: var(--on-ink); }

.more { margin-top: 32px; border-top: 1px solid var(--paper-2); padding-top: 20px; }
.more summary { cursor: pointer; font-weight: 600; font-size: 15.5px; }
.more-body { padding-top: 12px; }
.more-body p { font-family: var(--serif); color: var(--on-paper-dim); max-width: 68ch; }

/* ---------- Cấu hình + chi phí ---------- */
.specs { margin: 28px 0 0; }
.specs > div { padding: 16px 0; border-top: 1px solid var(--ink-3); }
.specs dt { font-family: var(--mono); font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--jade); margin-bottom: 6px; }
.specs dd { margin: 0; font-size: 15px; color: var(--dim); }

.cost { width: 100%; border-collapse: collapse; margin-top: 28px; font-size: 14.5px; }
.cost th {
  text-align: left; font-family: var(--mono); font-size: 11px;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--dim);
  font-weight: 400; padding: 0 0 10px; border-bottom: 1px solid var(--ink-3);
}
.cost td { padding: 11px 0; border-bottom: 1px solid var(--ink-2); color: var(--dim); }
.cost td:first-child { color: var(--on-ink); }
.cost .free { font-family: var(--mono); font-weight: 600; color: var(--jade); text-align: right; }

/* ---------- FAQ ---------- */
.faq { margin-top: 40px; columns: 2; column-gap: 40px; }
@media (max-width: 860px) { .faq { columns: 1; } }
.faq article { break-inside: avoid; margin-bottom: 28px; }
.faq h3 { color: var(--on-paper); }
.faq p { font-family: var(--serif); font-size: 16px; color: var(--on-paper-dim); margin: 0; }

/* ---------- Chân trang ---------- */
.footer { border-top: 1px solid var(--ink-3); padding: 44px 0; }
.footer-in { display: grid; grid-template-columns: auto 1fr auto; gap: 32px; align-items: start; }
@media (max-width: 860px) { .footer-in { grid-template-columns: 1fr; gap: 18px; } }
.footer p { margin: 0; font-size: 13.5px; color: var(--dim); }
.footer-brand { font-weight: 800; color: var(--on-ink) !important; font-size: 15px !important; margin-bottom: 4px !important; }
.footer a { color: var(--jade); text-underline-offset: 3px; }
.disclaimer { max-width: 62ch; }
.ver { font-family: var(--mono); font-size: 12px; white-space: nowrap; }