/*
  Odoline — CSS của landing, tách từ bản dựng thử docs/mockups/landing-home-comp.html.
  Màu lấy từ lib/core/theme/fuelbook_theme.dart và DataColors trong tokens.dart.
  Contrast WCAG (chữ >= 4.5, non-text >= 3.0) do tool/site/contrast.py đo; bảng dưới do
  `python3 tool/site/contrast.py` sinh và test_site.py kiểm khớp. Không đặt chữ trắng lên
  fuel/charge/service; nút có chữ chỉ dùng primary/on-primary hoặc tonal pc/on-pc.

  cặp (fg / bg)            loại      sáng    tối    dùng ở
  ink / bg                 text      17.32  15.06   body, tiêu đề
  ink / surface            text      18.05  13.20   thẻ, form
  ink / low                text      16.33  13.81   section nền phụ, UI mini
  ink / s2                 text      15.33  11.63   chip trong hình
  ink / art-a              text      16.09  12.95   tiêu đề trong hình story
  muted / bg               text       8.16   9.92   lede, ghi chú, footer
  muted / surface          text       8.50   8.70   chữ phụ trong thẻ
  muted / low              text       7.69   9.10   chữ phụ nền phụ
  muted / s2               text       7.22   7.66   nhãn trong hình
  muted / art-a            text       7.58   8.53   dòng phụ trong hình story
  primary / bg             text       7.30  11.16   link, eyebrow, nửa sau H1
  primary / surface        text       7.61   9.79   link trong thẻ, nút tonal trên thẻ Pro
  primary / low            text       6.88  10.24   eyebrow trên nền phụ
  on-primary / primary     text       7.61   8.38   nhãn nút tô màu
  on-pc / pc               text       9.57   8.22   pill, tab chọn, nút tonal, thẻ Pro
  ink / charge-c           text      14.90   9.25   số hero Home
  muted / charge-c         text       7.02   6.09   dòng phụ thẻ hero
  charge / charge-c        text       4.72   6.74   "est. from battery", nhãn Free
  charge / surface         text       5.71   9.63   "same as last time"
  charge / bg              text       5.48  10.98   thông báo thành công
  fuel / fuel-c            text       4.57   6.70   nhãn xăng
  service / service-c      text       5.49   6.34   nhãn "due soon"
  error / bg               text       6.27   9.53   thông báo lỗi
  muted / pc               text       6.74   5.54   lede/ghi chú trên quầng sáng (xấu nhất)
  primary / pc             text       6.04   6.24   nửa sau H1, thông báo info
  charge / pc              text       4.53   6.13   thông báo ok trên quầng (thấp nhất light)
  error / pc               text       5.18   5.32   thông báo lỗi trên quầng (thấp nhất dark)
  muted / fuel-c           text       6.85   5.93   lede trên quầng hổ phách
  charge / fuel-c          text       4.61   6.57   thông báo ok trên quầng hổ phách
  outline / surface        non-text   4.30   4.45   viền ô nhập, chip, form
  outline / bg             non-text   4.13   5.07   viền form pill, chấm tab
  outline / low            non-text   3.89   4.65   viền trên nền phụ
  outline / art-a          non-text   3.83   4.36   viền trong hình (thấp nhất cả hai)
  primary / bg             non-text   7.30  11.16   focus ring
  primary / pc             non-text   6.04   6.24   vạch tab chọn
  on-pc / pc               non-text   9.57   8.22   icon check thẻ Pro
  charge / bg              non-text   5.48  10.98   icon check của badge
  charge / charge-c        non-text   4.72   6.74   sparkline, icon sạc
  fuel / fuel-c            non-text   4.57   6.70   icon xăng
  service / service-c      non-text   5.49   6.34   icon bảo dưỡng
  expense / expense-c      non-text   5.60   6.72   icon định dạng file
*/
@font-face { font-family: "Figtree"; font-weight: 700; font-style: normal; font-display: swap; src: url("/assets/fonts/Figtree-Bold.ttf") format("truetype"); }
:root {
  /* Màu: FuelbookTheme light + DataColors light. */
  --bg: #FDFAF4; --surface: #FFFFFF; --low: #F7F3ED; --s2: #F0ECE5; --high: #EAE6DE;
  --ink: #191610; --muted: #524C42; --outline: #80796F; --line: #CFCAC1;
  --primary: #1B5A74; --on-primary: #FFFFFF; --pc: #CCEAF6; --on-pc: #003B50; --error: #B02A2D;
  --fuel: #955905; --fuel-c: #FEE2C9; --charge: #337344; --charge-c: #D6F0DA;
  --service: #4953AB; --service-c: #E1E7FF; --expense: #854078; --expense-c: #FADEF3;
  --art-a: #E9F4F5; /* 40 % primaryContainer trên surface, chỉ là nền hình */
  --shadow: 0 1px 2px rgba(25, 22, 16, .06), 0 14px 36px rgba(27, 90, 116, .12);
  --shadow-sm: 0 6px 18px rgba(25, 22, 16, .08);

  /* FuelbookRadius / FuelbookSpacing / FuelbookMotion. */
  --r-8: 8px; --r-12: 12px; --r-16: 16px; --r-20: 20px; --r-28: 28px; --r-full: 999px;
  --s-4: 4px; --s-8: 8px; --s-12: 12px; --s-16: 16px; --s-24: 24px; --s-32: 32px; --s-48: 48px;
  --ease: cubic-bezier(.33, 1, .68, 1); /* easeOutCubic */
  --fast: 150ms; --medium: 250ms; --sheet-in: 400ms; --sheet-out: 200ms;

  --font-text: -apple-system, BlinkMacSystemFont, "SF Pro Text", Roboto, "Segoe UI", system-ui, sans-serif;
  --font-display: "Figtree", -apple-system, BlinkMacSystemFont, "SF Pro Display", Roboto, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #151310; --surface: #22201C; --low: #1E1C18; --s2: #2C2A26; --high: #373430;
    --ink: #EBE7E1; --muted: #C2BDB4; --outline: #8B857C; --line: #46423B;
    --primary: #9FD0E6; --on-primary: #003045; --pc: #00465B; --on-pc: #CCEAF6; --error: #F8A49D;
    --fuel: #F4BF8C; --fuel-c: #56340E; --charge: #9AD5A5; --charge-c: #1F4127;
    --service: #B5C1F9; --service-c: #2F3671; --expense: #E5B1D9; --expense-c: #4E2946;
    --art-a: #0E252A;
    --shadow: none; --shadow-sm: none;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #151310; --surface: #22201C; --low: #1E1C18; --s2: #2C2A26; --high: #373430;
  --ink: #EBE7E1; --muted: #C2BDB4; --outline: #8B857C; --line: #46423B;
  --primary: #9FD0E6; --on-primary: #003045; --pc: #00465B; --on-pc: #CCEAF6; --error: #F8A49D;
  --fuel: #F4BF8C; --fuel-c: #56340E; --charge: #9AD5A5; --charge-c: #1F4127;
  --service: #B5C1F9; --service-c: #2F3671; --expense: #E5B1D9; --expense-c: #4E2946;
  --art-a: #0E252A;
  --shadow: none; --shadow-sm: none;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 17px/1.55 var(--font-text);
  -webkit-font-smoothing: antialiased;
}
/* Dải che vùng tai thỏ khi thanh trên dính ở top: env(safe-area-inset-top). */
body::before { content: ""; position: fixed; z-index: 6; left: 0; right: 0; top: 0; height: env(safe-area-inset-top, 0px); background: var(--bg); }
a { color: var(--primary); text-underline-offset: 3px; }
p { margin: 0; }
h1, h2, h3 { font-family: var(--font-display); margin: 0; text-wrap: balance; letter-spacing: -.015em;
  overflow-wrap: anywhere; hyphens: auto; }
h1 { font-size: clamp(36px, 5.6vw, 58px); line-height: 1.06; font-weight: 700; letter-spacing: -.025em; }
h2 { font-size: clamp(28px, 4vw, 40px); line-height: 1.12; font-weight: 700; }
h3 { font-size: 20px; line-height: 1.3; font-weight: 700; letter-spacing: -.005em; }
.muted { color: var(--muted); }
.eyebrow { font-size: 13px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--primary); }
.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
:focus-visible { outline: 3px solid var(--primary); outline-offset: 3px; border-radius: var(--r-12); }
.skip { position: absolute; left: -9999px; top: var(--s-8); z-index: 10; background: var(--surface); color: var(--primary); padding: var(--s-12) var(--s-16); border-radius: var(--r-12); }
.skip:focus { left: var(--s-16); }

/* Một wrapper ngoài giữ gutter: 16 trên điện thoại, 24 / 32 ở màn rộng. */
.page {
  --gl: max(16px, env(safe-area-inset-left, 0px));
  --gr: max(16px, env(safe-area-inset-right, 0px));
  padding-left: var(--gl); padding-right: var(--gr); overflow-x: clip;
}
@media (min-width: 768px) { .page { --gl: max(24px, env(safe-area-inset-left, 0px)); --gr: max(24px, env(safe-area-inset-right, 0px)); } }
@media (min-width: 1200px) { .page { --gl: max(32px, env(safe-area-inset-left, 0px)); --gr: max(32px, env(safe-area-inset-right, 0px)); } }
.wrap { max-width: 1120px; margin: 0 auto; }
.bleed { margin-left: calc(-1 * var(--gl)); margin-right: calc(-1 * var(--gr)); padding-left: var(--gl); padding-right: var(--gr); }

/* Thanh trên: dính, mờ nền, một nút tô màu. */
.top { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 5;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  -webkit-backdrop-filter: saturate(1.4) blur(14px); backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent); }
.top .wrap { display: flex; align-items: center; gap: var(--s-8); min-height: 64px; }
.logo { display: inline-flex; align-items: center; gap: var(--s-8); min-height: 48px; margin-right: auto; color: var(--ink); text-decoration: none; font: 700 20px/1 var(--font-display); letter-spacing: -.01em; }
.logo svg { width: 32px; height: 32px; flex: none; }
.top nav { display: flex; align-items: center; gap: var(--s-4); }
.top nav a { display: inline-flex; align-items: center; min-height: 48px; padding: 0 var(--s-12); border-radius: var(--r-full); color: var(--ink); text-decoration: none; font-weight: 600; font-size: 15px; transition: background var(--fast) var(--ease); }
.top nav a:hover { background: var(--s2); }
.top .lang { color: var(--muted); font-size: 14px; margin-right: var(--s-8); }
.top .lang a { padding: 0 var(--s-8); font-size: 14px; color: var(--muted); }
.top .lang a[aria-current="page"] { color: var(--ink); text-decoration: underline; text-decoration-thickness: 2px; }
.top nav a.cta { padding: 0 var(--s-24); background: var(--primary); color: var(--on-primary); font-weight: 700; white-space: nowrap;
  transition: background var(--fast) var(--ease), color var(--fast) var(--ease); }
/* Khi một form waitlist đang trong khung nhìn, nút trên lùi về tonal: mỗi khung chỉ một nút tô màu. */
.top nav a.cta.tonal { background: var(--pc); color: var(--on-pc); }
@media (max-width: 760px) { .top .links, .top .lang { display: none; } .top nav a.cta { padding: 0 var(--s-16); } }
/* Nhãn CTA dài (FR „Rejoindre la liste d’attente“) xuống hai dòng thay vì lấn lề phải ở 360 px. */
@media (max-width: 420px) { .top nav a.cta { white-space: normal; text-align: center; line-height: 1.2; } }

/* Hero */
.hero { position: relative; isolation: isolate; }
.hero::before { content: ""; position: absolute; z-index: -1; inset: -64px calc(-1 * var(--gr)) 0 calc(-1 * var(--gl)); pointer-events: none;
  background: radial-gradient(45% 50% at 12% 20%, color-mix(in srgb, var(--pc) 55%, transparent), transparent 70%),
              radial-gradient(35% 40% at 88% 75%, color-mix(in srgb, var(--fuel-c) 50%, transparent), transparent 70%); }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--s-32); padding-block: var(--s-32) var(--s-48); }
@media (min-width: 900px) { .hero .wrap { grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: var(--s-48); align-items: center; padding-block: var(--s-48) var(--s-48); } }
.hero-copy { display: grid; gap: var(--s-24); }
.hero h1 span { color: var(--primary); }
.lede { font-size: clamp(18px, 2vw, 20px); color: var(--muted); max-width: 34em; }
.pill { justify-self: start; display: inline-flex; align-items: center; gap: var(--s-8); min-height: 32px; padding: 0 var(--s-16); border-radius: var(--r-full); background: var(--pc); color: var(--on-pc); font-size: 14px; font-weight: 700; }
.pill i { width: 8px; height: 8px; border-radius: 50%; background: var(--primary); }

/* Form waitlist: pill, honeypot, trạng thái aria-live, chạy được không cần JS. */
.join { display: grid; gap: var(--s-8); max-width: 520px; }
.join form { display: flex; gap: var(--s-8); padding: var(--s-4); background: var(--surface); border: 1px solid var(--outline); border-radius: var(--r-full); box-shadow: var(--shadow); }
.join form:focus-within { outline: 3px solid var(--primary); outline-offset: 2px; }
.join input[type=email] { flex: 1; min-width: 0; min-height: 52px; padding: 0 var(--s-16); border: 0; border-radius: var(--r-full); background: transparent; color: var(--ink); font: inherit; }
.join input[type=email]::placeholder { color: var(--muted); opacity: 1; }
.join input[type=email]:focus { outline: none; }
.join button { min-height: 52px; padding: 0 var(--s-24); border: 0; border-radius: var(--r-full); background: var(--primary); color: var(--on-primary); font: inherit; font-weight: 700; white-space: nowrap; cursor: pointer; }
.join button[disabled] { cursor: progress; }
.join .hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.join .note { font-size: 14px; color: var(--muted); }
.join .status { min-height: 1.5em; font-size: 15px; font-weight: 600; }
.join .status.ok { color: var(--charge); }
.join .status.err { color: var(--error); }
.join .status.info { color: var(--primary); }
@media (max-width: 460px) { .join form { flex-direction: column; border-radius: var(--r-28); } .join input[type=email] { padding: 0 var(--s-12); } }
.badges { display: flex; flex-wrap: wrap; gap: var(--s-8) var(--s-24); padding: 0; margin: 0; list-style: none; font-size: 15px; color: var(--muted); }
.badges li { display: inline-flex; align-items: center; gap: var(--s-8); }
.badges svg { width: 18px; height: 18px; color: var(--charge); flex: none; }

/* ---------- Story: UI thật của Odoline dựng bằng HTML, 3 cảnh ---------- */
.story { margin: 0; display: grid; gap: var(--s-16); width: 100%; max-width: 460px; justify-self: center; }
.art { position: relative; height: 456px; border-radius: var(--r-28); overflow: hidden; border: 1px solid var(--line);
  background: linear-gradient(165deg, var(--art-a), var(--low)); box-shadow: var(--shadow); }
.scene { position: absolute; inset: 0; opacity: 0; visibility: hidden;
  transition: opacity var(--medium) var(--ease), visibility 0s linear var(--medium); }
.story[data-state="a"] .scene-a, .story[data-state="b"] .scene-b, .story[data-state="c"] .scene-c { opacity: 1; visibility: visible; transition-delay: 0s; }
.ico { display: grid; place-items: center; flex: none; width: 40px; height: 40px; border-radius: var(--r-12); }
.ico svg { width: 22px; height: 22px; }
.ico.sm { width: 32px; height: 32px; border-radius: var(--r-8); }
.ico.sm svg { width: 18px; height: 18px; }
.ico.fuel { background: var(--fuel-c); color: var(--fuel); }
.ico.charge { background: var(--charge-c); color: var(--charge); }
.ico.service { background: var(--service-c); color: var(--service); }
.ico.expense { background: var(--expense-c); color: var(--expense); }
.ico.pro { background: var(--pc); color: var(--on-pc); }
.ico.plain { background: var(--s2); color: var(--ink); }

/* Cảnh a: sheet sạc trượt lên (sheetIn 400 ms). */
.sheet { position: absolute; left: var(--s-12); right: var(--s-12); top: var(--s-24); bottom: 0; padding: var(--s-12) var(--s-16) var(--s-16);
  background: var(--surface); border: 1px solid var(--line); border-bottom: 0; border-radius: var(--r-28) var(--r-28) 0 0; box-shadow: var(--shadow-sm);
  display: grid; gap: var(--s-12); align-content: start; transform: translateY(40px); transition: transform var(--sheet-in) var(--ease); }
.story[data-state="a"] .sheet { transform: none; }
.handle { justify-self: center; width: 32px; height: 4px; border-radius: 2px; background: var(--outline); }
.sheet-title { display: flex; align-items: center; justify-content: space-between; gap: var(--s-8); }
.sheet-title b { font: 700 18px/1.2 var(--font-display); }
.chips { display: flex; flex-wrap: wrap; gap: var(--s-8); }
.chip { display: inline-flex; align-items: center; gap: var(--s-4); min-height: 32px; padding: 0 var(--s-12); border-radius: var(--r-8); border: 1px solid var(--outline); font-size: 14px; font-weight: 600; color: var(--ink); background: var(--surface); }
.chip svg { width: 16px; height: 16px; }
.chip.on { background: var(--pc); color: var(--on-pc); border-color: transparent; }
.seg { display: inline-flex; border: 1px solid var(--outline); border-radius: var(--r-8); overflow: hidden; }
.seg span { display: inline-flex; align-items: center; gap: var(--s-4); min-height: 30px; padding: 0 var(--s-12); font-size: 14px; font-weight: 600; }
.seg span + span { border-left: 1px solid var(--outline); }
.seg span.on { background: var(--pc); color: var(--on-pc); }
.seg svg { width: 14px; height: 14px; }
.fields { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--s-8); }
.field { min-width: 0; min-height: 52px; padding: var(--s-4) var(--s-12); border: 1px solid var(--outline); border-radius: var(--r-12); display: grid; align-content: center; }
.field small { font-size: 12px; line-height: 16px; color: var(--muted); font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.field b { font-size: 16px; line-height: 22px; font-weight: 600; font-variant-numeric: tabular-nums; white-space: nowrap; }
.field b em { font-style: normal; font-weight: 400; color: var(--muted); font-size: 14px; }
.field .hint { color: var(--charge); white-space: normal; }
@media (max-width: 420px) { .art { height: 500px; } .sheet { gap: var(--s-8); } .field { padding: var(--s-4) var(--s-8); } }
.field.wide { grid-column: 1 / -1; }
.soc { grid-column: 1 / -1; display: grid; grid-template-columns: minmax(0, 1fr) 20px minmax(0, 1fr); gap: var(--s-4); align-items: center; }
.soc > svg { width: 20px; height: 20px; color: var(--muted); }
.total { display: flex; align-items: baseline; justify-content: space-between; padding-top: var(--s-8); border-top: 1px solid var(--line); }
.total span { font-size: 15px; color: var(--muted); font-weight: 600; }
.total b { font: 700 26px/1.2 var(--font-display); font-variant-numeric: tabular-nums; }
.save { display: grid; place-items: center; min-height: 44px; border-radius: var(--r-full); background: var(--primary); color: var(--on-primary); font-weight: 700; font-size: 15px; }

/* Cảnh b: Home với thẻ hero tông sạc. */
.home { position: absolute; inset: var(--s-24) var(--s-16) var(--s-16); display: grid; gap: var(--s-12); align-content: start; }
.home-top { display: flex; align-items: center; justify-content: space-between; gap: var(--s-8); }
.home-top b { display: block; font: 700 22px/1.2 var(--font-display); }
.home-top small { display: block; font-size: 13px; color: var(--muted); font-weight: 600; }
.home-top .ico { border-radius: var(--r-full); }
.hero-card { padding: var(--s-16); border-radius: var(--r-20); background: var(--charge-c); color: var(--ink); display: grid; gap: var(--s-8);
  transform: translateY(16px); transition: transform var(--medium) var(--ease); }
.story[data-state="b"] .hero-card { transform: none; }
.hero-card .over { display: flex; align-items: center; gap: var(--s-8); font-size: 13px; font-weight: 600; color: var(--muted); }
.hero-card .over svg { width: 16px; height: 16px; color: var(--charge); }
.metric { display: flex; align-items: baseline; gap: var(--s-8); flex-wrap: wrap; }
.metric b { font: 700 52px/1 var(--font-display); font-variant-numeric: tabular-nums; letter-spacing: -.02em; }
.metric span { font: 700 18px/1.2 var(--font-display); }
.metric em { flex-basis: 100%; font-style: normal; font-size: 13px; font-weight: 600; color: var(--charge); display: inline-flex; align-items: center; gap: var(--s-4); }
.metric em svg { width: 16px; height: 16px; }
.spark { width: 100%; height: 44px; display: block; overflow: visible; }
.spark .line { fill: none; stroke: var(--charge); stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; vector-effect: non-scaling-stroke;
  stroke-dasharray: 1; stroke-dashoffset: 1; transition: stroke-dashoffset var(--sheet-in) var(--ease) 100ms; }
.story[data-state="b"] .spark .line { stroke-dashoffset: 0; }
.spark .axis { stroke: var(--muted); stroke-width: 1; vector-effect: non-scaling-stroke; }
.stats { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: var(--s-12); padding-top: var(--s-8); border-top: 1px solid color-mix(in srgb, var(--charge) 35%, transparent); }
.stats b { display: block; font: 700 20px/1.2 var(--font-display); font-variant-numeric: tabular-nums; white-space: nowrap; }
.stats small { display: block; font-size: 12px; line-height: 16px; color: var(--muted); font-weight: 600; }
.row { display: flex; align-items: center; gap: var(--s-12); min-height: 64px; padding: var(--s-8) var(--s-12); border-radius: var(--r-16); background: var(--surface); border: 1px solid var(--line); }
.row > div { min-width: 0; flex: 1; }
.row b { display: block; font-size: 15px; line-height: 1.3; font-weight: 600; }
.row small { display: block; font-size: 13px; line-height: 1.4; color: var(--muted); font-variant-numeric: tabular-nums; }
.row .end { flex: none; text-align: right; font-size: 13px; line-height: 1.4; color: var(--muted); font-variant-numeric: tabular-nums; font-weight: 600; }
.row .end b { font-size: 15px; color: var(--ink); }
.scene-b .row { opacity: 0; transform: translateY(8px); transition: opacity var(--medium) var(--ease) 150ms, transform var(--medium) var(--ease) 150ms; }
.story[data-state="b"] .scene-b .row { opacity: 1; transform: none; }

/* Cảnh c: bản sao của riêng bạn. */
.keep { position: absolute; inset: var(--s-24) var(--s-16); display: grid; gap: var(--s-12); align-content: center; }
.keep-title { font: 700 22px/1.2 var(--font-display); }
.keep-sub { font-size: 14px; color: var(--muted); margin-top: calc(-1 * var(--s-8)); }
.keep .row { opacity: 0; transform: translateY(8px); transition: opacity var(--medium) var(--ease), transform var(--medium) var(--ease); }
.keep .row.r2 { transition-delay: 80ms; }
.story[data-state="c"] .keep .row { opacity: 1; transform: none; }
.flow { display: flex; align-items: center; justify-content: center; gap: var(--s-8); font-size: 13px; color: var(--muted); font-weight: 600; }
.flow svg { width: 20px; height: 20px; color: var(--primary); }
.keep .row.dest { border: 2px solid var(--primary); transition-delay: 160ms; }
.ok-badge { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; background: var(--charge-c); color: var(--charge); flex: none;
  transform: scale(.6); opacity: 0; transition: transform var(--medium) var(--ease) 320ms, opacity var(--fast) var(--ease) 320ms; }
.ok-badge svg { width: 20px; height: 20px; }
.story[data-state="c"] .ok-badge { transform: none; opacity: 1; }
.tag { display: inline-flex; align-items: center; min-height: 22px; padding: 0 var(--s-8); border-radius: var(--r-8); font: 700 12px/1 var(--font-text); vertical-align: 2px; letter-spacing: 0; white-space: nowrap; }
.tag.pro { background: var(--pc); color: var(--on-pc); }
.tag.service { background: var(--service-c); color: var(--service); }
.tag.charge { background: var(--charge-c); color: var(--charge); }

.caps { display: grid; }
.cap { grid-area: 1 / 1; display: grid; gap: var(--s-4); opacity: 0; transform: translateY(6px); transition: opacity var(--medium) var(--ease), transform var(--medium) var(--ease); }
.cap strong { font: 700 24px/1.2 var(--font-display); letter-spacing: -.015em; }
.cap span { color: var(--muted); font-size: 16px; }
.story[data-state="a"] .cap[data-cap="a"], .story[data-state="b"] .cap[data-cap="b"], .story[data-state="c"] .cap[data-cap="c"] { opacity: 1; transform: none; }
.tabs { display: flex; gap: var(--s-8); flex-wrap: wrap; }
.tabs button { display: inline-flex; align-items: center; gap: var(--s-8); min-height: 48px; padding: 0 var(--s-16); border: 1px solid var(--outline); border-radius: var(--r-full); background: var(--surface); color: var(--ink); font: inherit; font-size: 15px; font-weight: 600; cursor: pointer; transition: background var(--fast) var(--ease), color var(--fast) var(--ease); }
.tabs button i { width: 8px; height: 8px; border-radius: var(--r-full); background: var(--outline); transition: width var(--medium) var(--ease), background var(--medium) var(--ease); }
.tabs button[aria-pressed="true"] { background: var(--pc); color: var(--on-pc); border-color: transparent; }
.tabs button[aria-pressed="true"] i { width: 20px; background: var(--primary); }
.tabs button { white-space: nowrap; }
@media (max-width: 420px) { .tabs button { flex: 1 1 0; justify-content: center; gap: var(--s-4); padding: 0 var(--s-4); font-size: 14px; } .tabs button[aria-pressed="true"] i { width: 14px; } }
@media (prefers-reduced-motion: reduce) { .story *, .story *::before, .top .cta { transition: none !important; } }

/* ---------- Section chung ---------- */
section.block { padding-block: calc(var(--s-48) * 2); }
section.block.alt { background: var(--low); }
section.block .head { display: grid; gap: var(--s-12); max-width: 760px; margin-bottom: var(--s-48); }
section.block .head p { font-size: 19px; color: var(--muted); }
@media (max-width: 720px) { section.block { padding-block: calc(var(--s-32) * 2); } section.block .head { margin-bottom: var(--s-32); } }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-20); }

/* Nghe quen không */
.quotes { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-16); padding: 0; margin: 0; list-style: none; }
@media (max-width: 820px) { .quotes { grid-template-columns: minmax(0, 1fr); } }
.quote { padding: var(--s-24); display: grid; gap: var(--s-12); align-content: start; }
.quote p { font: 700 20px/1.35 var(--font-display); letter-spacing: -.01em; }
.quote small { display: flex; gap: var(--s-8); color: var(--muted); font-size: 15px; }
.quote small svg { width: 18px; height: 18px; color: var(--primary); flex: none; margin-top: 3px; }

/* Cách dùng: 4 bước theo đúng thứ tự, mỗi bước một UI thật thu nhỏ. */
.steps { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-16); padding: 0; margin: 0; list-style: none; }
@media (max-width: 760px) { .steps { grid-template-columns: minmax(0, 1fr); } }
.step { padding: var(--s-16); display: grid; gap: var(--s-16); align-content: start; }
.step .copy { display: grid; gap: var(--s-8); padding: 0 var(--s-8) var(--s-8); justify-items: start; }
.step .n { display: inline-flex; align-items: center; gap: var(--s-8); font-size: 13px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--primary); }
.step .n b { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; border: 2px solid var(--primary); font: 700 14px/1 var(--font-display); letter-spacing: 0; font-variant-numeric: tabular-nums; }
.step p { color: var(--muted); font-size: 16px; }
.mini { padding: var(--s-16); border-radius: var(--r-16); background: var(--low); border: 1px solid var(--line); display: grid; gap: var(--s-8); min-height: 212px; align-content: center; }
.mini .row { min-height: 60px; }
.mini-head { display: flex; align-items: center; justify-content: space-between; gap: var(--s-8); font-size: 14px; font-weight: 600; color: var(--muted); }
.mini-head b { font: 700 16px/1.3 var(--font-display); color: var(--ink); }
.mini-head svg { width: 20px; height: 20px; color: var(--primary); }
.big { font: 700 22px/1.25 var(--font-display); font-variant-numeric: tabular-nums; padding-block: var(--s-4); }
.btns { display: flex; flex-wrap: wrap; gap: var(--s-8); }
.btns span { display: inline-flex; align-items: center; justify-content: center; min-height: 40px; padding: 0 var(--s-16); border-radius: var(--r-full); font-size: 14px; font-weight: 700; white-space: nowrap; }
.btns .tonal { background: var(--pc); color: var(--on-pc); }
.btns .outlined { border: 1px solid var(--outline); color: var(--primary); background: var(--surface); }
.radio { width: 20px; height: 20px; border-radius: 50%; border: 2px solid var(--outline); flex: none; display: grid; place-items: center; }
.radio.on { border-color: var(--primary); }
.radio.on::after { content: ""; width: 10px; height: 10px; border-radius: 50%; background: var(--primary); }
.switch-link { display: inline-flex; align-items: center; min-height: 48px; font-size: 15px; font-weight: 600; }

/* Nguyên tắc */
.principles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-16); padding: 0; margin: 0; list-style: none; }
@media (max-width: 900px) { .principles { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .principles { grid-template-columns: minmax(0, 1fr); } }
.principle { padding: var(--s-24); display: grid; gap: var(--s-8); align-content: start; }
.principle .ico { width: 44px; height: 44px; margin-bottom: var(--s-4); }
.principle p { color: var(--muted); font-size: 16px; }

/* Giá */
.prices { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--s-16); max-width: 920px; }
@media (max-width: 760px) { .prices { grid-template-columns: minmax(0, 1fr); } }
.price { padding: var(--s-32) var(--s-24); border-radius: var(--r-28); display: grid; gap: var(--s-16); align-content: start; }
.price.pro { background: var(--pc); color: var(--on-pc); border: 2px solid var(--primary); }
.price .amount { font: 700 40px/1.1 var(--font-display); letter-spacing: -.02em; font-variant-numeric: tabular-nums; }
/* Dòng phụ (một lần · gói năm) xuống dòng riêng: giá EN có cả $ và £ nên dài. */
.price .amount small { display: block; margin-top: var(--s-4); font: 600 16px/1.3 var(--font-text); letter-spacing: 0; color: var(--muted); }
.price.pro .amount small, .price.pro .fine { color: var(--on-pc); }
.price ul { margin: 0; padding: 0; list-style: none; display: grid; gap: var(--s-8); font-size: 16px; }
.price li { display: grid; grid-template-columns: 24px minmax(0, 1fr); gap: var(--s-8); }
.price li svg { width: 20px; height: 20px; margin-top: 2px; color: var(--charge); }
.price.pro li svg { color: var(--on-pc); }
.price .fine { font-size: 14px; color: var(--muted); }
.price .link { justify-self: start; display: inline-flex; align-items: center; min-height: 48px; padding: 0 var(--s-24); border-radius: var(--r-full); font-weight: 700; font-size: 15px; text-decoration: none; background: var(--pc); color: var(--on-pc); }
.price.pro .link { background: var(--surface); color: var(--primary); }
.pledge { margin-top: var(--s-24); display: flex; align-items: center; gap: var(--s-12); max-width: 920px; padding: var(--s-16) var(--s-24); border-radius: var(--r-20); border: 1px solid var(--line); background: var(--surface); font-weight: 600; }
.pledge svg { width: 24px; height: 24px; color: var(--primary); flex: none; }

/* FAQ */
.faq { display: grid; gap: var(--s-8); max-width: 820px; }
.faq details { padding: 0 var(--s-24); }
.faq summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: var(--s-16); min-height: 64px; padding: var(--s-12) 0; font-weight: 600; font-size: 18px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary svg { width: 22px; height: 22px; color: var(--primary); flex: none; transition: transform var(--medium) var(--ease); }
.faq details[open] summary svg { transform: rotate(45deg); }
.faq details p { padding-bottom: var(--s-24); color: var(--muted); font-size: 16px; max-width: 64ch; }
@media (prefers-reduced-motion: reduce) { .faq summary svg { transition: none; } }

/* CTA cuối */
.final .box { position: relative; overflow: hidden; isolation: isolate; text-align: center; padding: clamp(32px, 6vw, 64px) var(--s-24); border-radius: var(--r-28); display: grid; gap: var(--s-16); justify-items: center; }
.final .box::before { content: ""; position: absolute; inset: 0; z-index: -1;
  background: radial-gradient(50% 60% at 15% 0%, color-mix(in srgb, var(--pc) 60%, transparent), transparent 70%),
              radial-gradient(45% 60% at 90% 100%, color-mix(in srgb, var(--fuel-c) 55%, transparent), transparent 70%); }
.final .join { width: 100%; justify-self: center; text-align: left; }
.final svg.mark { width: 72px; height: 72px; }

footer { padding-block: var(--s-32) var(--s-48); color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); }
footer .wrap { display: grid; gap: var(--s-12); }
footer nav { display: flex; flex-wrap: wrap; align-items: center; column-gap: var(--s-16); }
footer a { display: inline-flex; align-items: center; min-height: 48px; color: var(--muted); }
footer .sep { width: 1px; height: 20px; background: var(--line); }
footer .sep:first-child { display: none; } /* chưa có link trang nào trước vạch ngăn */
/* Trang văn bản (chính sách, hướng dẫn, 404) và ghi chú ngày của bài viết. */
.page-text { padding-block: var(--s-48); }
.page-text .wrap { max-width: 760px; display: grid; gap: var(--s-16); }
.page-text h2 { margin-top: var(--s-16); }
.page-text p, .page-text li { max-width: 68ch; }
.page-text .meta { color: var(--muted); font-size: 15px; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; } }


/* Danh sách trong thẻ nguyên tắc (trang "Switch from"). */
.principle ul { margin: 0; padding-left: 1.2em; display: grid; gap: var(--s-8); color: var(--muted); font-size: 16px; }

/* Trang Format: bảng cột export, khối mã và bảng cấu trúc file. */
.page-text code, .spec code { font: 500 .92em/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: var(--low); border-radius: var(--r-8); padding: 1px 6px; overflow-wrap: anywhere; }
.page-text pre { margin: 0; padding: var(--s-16); background: var(--low); border: 1px solid var(--line);
  border-radius: var(--r-12); font: 500 14px/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  white-space: pre-wrap; overflow-wrap: anywhere; }
.page-text pre code { background: none; padding: 0; font: inherit; }
.spec { width: 100%; max-width: 68ch; border-collapse: collapse; font-size: 15px; }
.spec caption { text-align: left; font-family: var(--font-display); font-weight: 700; font-size: 18px;
  padding-bottom: var(--s-8); overflow-wrap: anywhere; }
.spec th, .spec td { text-align: left; vertical-align: top; padding: var(--s-8) var(--s-12);
  border-bottom: 1px solid var(--line); }
.spec th { color: var(--muted); font-weight: 600; font-size: 14px; }
.spec td.n { width: 3.5em; color: var(--muted); font-variant-numeric: tabular-nums; }

/* Ảnh app thật ({{shot}}, Task 8): ảnh chụp simulator, nạp lười, khung bo như máy. */
.shots { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--s-24); margin: var(--s-48) 0 0; }
.page-text .shots { justify-content: flex-start; margin-top: var(--s-16); }
figure.shot { margin: 0; flex: 0 1 260px; min-width: 0; max-width: 260px; }
figure.shot img { display: block; width: 100%; height: auto; border-radius: var(--r-28);
  border: 1px solid var(--line); box-shadow: var(--shadow-sm); background: var(--surface); }
@media (max-width: 560px) { .shots { gap: var(--s-16); } figure.shot { flex-basis: 100%; max-width: 280px; } }