/* DriveFlow website — giai đoạn 1 (giao diện tĩnh) */
:root {
  --ink: #0b2530;
  --ink-2: #123543;
  --teal: #167a92;
  --teal-strong: #0f6478;
  --mint: #b9f3e1;
  --mint-soft: #e3faf2;
  --paper: #f2f7f7;
  --surface: #ffffff;
  --line: #d3e3e4;
  --text: #10283c;
  --muted: #4b636d;
  --ok: #107c10;
  --warn: #8a5a00;
  --danger: #b3261e;

  --font: "Be Vietnam Pro", "Segoe UI", system-ui, sans-serif;
  --step--1: 0.875rem;
  --step-0: 1rem;
  --step-1: 1.125rem;
  --step-2: 1.5rem;
  --step-3: 2rem;
  --step-4: clamp(2.5rem, 6vw, 4.5rem);

  --radius-s: 6px;
  --radius-m: 10px;
  --radius-l: 18px;
  --wrap: 1120px;
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
[id] { scroll-margin-top: 84px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: var(--font);
  font-size: var(--step-0);
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: var(--teal-strong); text-underline-offset: 3px; }
a:hover { color: var(--ink); }
:focus-visible { outline: 3px solid var(--teal); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3 { line-height: 1.15; margin: 0 0 .5em; letter-spacing: -0.02em; color: var(--ink); }
h2 { font-size: var(--step-3); font-weight: 700; }
h3 { font-size: var(--step-1); font-weight: 600; letter-spacing: -0.01em; }
p { margin: 0 0 1em; }

.wrap { width: min(100% - 32px, var(--wrap)); margin-inline: auto; }
.prose { max-width: 68ch; }
.skip {
  position: absolute; left: 16px; top: -100px;
  background: var(--ink); color: #fff; padding: 8px 14px; border-radius: var(--radius-s); z-index: 10;
}
.skip:focus { top: 12px; color: #fff; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(242, 247, 247, .9); border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
}
.site-header > .wrap { display: flex; align-items: center; gap: 12px 28px; min-height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font-weight: 700; font-size: var(--step-1); letter-spacing: -0.015em; flex: none; }
.brand img { width: 34px; height: 34px; }
.header-menu { display: flex; align-items: center; gap: 12px; flex: 1; }
.nav { display: flex; gap: 2px; }
.nav a {
  color: var(--muted); text-decoration: none; padding: 8px 12px; border-radius: var(--radius-s); font-size: var(--step--1); font-weight: 500;
}
.nav a:hover { color: var(--ink); background: rgba(185, 243, 225, .35); }
.nav a[aria-current="page"] { color: var(--ink); background: var(--mint-soft); }
.header-tools { display: flex; align-items: center; gap: 16px; margin-left: auto; }
.signin { color: var(--ink); text-decoration: none; font-size: var(--step--1); font-weight: 600; padding: 8px 4px; }
.signin:hover { color: var(--teal-strong); text-decoration: underline; }
.signin[aria-current="page"] { color: var(--teal-strong); }
.header-dl { flex: none; }
.nav-toggle { display: none; }

/* Chọn ngôn ngữ */
.lang-switch {
  display: inline-flex; align-items: center; gap: 2px; padding: 3px; border-radius: 99px;
  background: var(--surface); border: 1px solid var(--line);
}
.lang-switch svg { margin: 0 4px 0 6px; color: var(--muted); flex: none; }
.lang-switch a {
  min-width: 34px; padding: 4px 10px; border-radius: 99px; text-align: center;
  font-size: 0.8125rem; font-weight: 600; color: var(--muted); text-decoration: none;
}
.lang-switch a:hover { color: var(--ink); }
.lang-switch a[aria-current="true"] { background: var(--ink); color: var(--mint); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 48px; padding: 0 22px; border-radius: var(--radius-m);
  font: 600 var(--step-0)/1 var(--font); text-decoration: none; cursor: pointer;
  border: 1px solid transparent; white-space: nowrap;
}
.btn svg { flex: none; }
.btn-primary { background: var(--teal-strong); color: #fff; }
.btn-primary:hover { background: var(--ink); color: #fff; }
.btn-ghost { background: var(--surface); color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--teal); color: var(--ink); }
.btn-small { min-height: 38px; padding: 0 14px; font-size: var(--step--1); }
.btn-danger { background: var(--surface); color: var(--danger); border-color: #e8c5c2; }
.btn-danger:hover { border-color: var(--danger); color: var(--danger); }
.btn[disabled] { opacity: .55; cursor: not-allowed; }

/* Hero */
.hero { padding: 72px 0 88px; overflow: hidden; }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 56px; align-items: center; }
.hero h1 { font-size: var(--step-4); font-weight: 800; letter-spacing: -0.045em; line-height: 1; margin-bottom: 24px; }
.hero .lede { font-size: var(--step-1); color: var(--muted); max-width: 46ch; margin-bottom: 32px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.release-note { margin-top: 18px; font-size: var(--step--1); color: var(--muted); }

/* Hero queue — phần tử đặc trưng */
.queue {
  background: var(--ink); color: #dcecef; border-radius: var(--radius-l);
  padding: 22px 22px 14px; box-shadow: 0 30px 60px -30px rgba(11, 37, 48, .55);
}
.queue-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 4px 16px; margin-bottom: 14px; }
.queue-head strong { color: #fff; font-weight: 600; }
.queue-head span { font-size: var(--step--1); color: #9fc3cb; }
.queue ul { list-style: none; margin: 0; padding: 0; }
.job { display: grid; grid-template-columns: 34px minmax(0, 1fr) 40px; gap: 4px 12px; align-items: center; padding: 12px 0; border-top: 1px solid rgba(185, 243, 225, .12); }
.job-icon { width: 34px; height: 34px; border-radius: 8px; display: grid; place-items: center; background: var(--ink-2); color: var(--mint); grid-row: span 2; }
.job-name { font-size: var(--step--1); color: #fff; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.job-meta { font-size: 0.8125rem; color: #9fc3cb; grid-column: 2; display: flex; justify-content: space-between; gap: 12px; }
.bar { grid-column: 2; height: 6px; background: rgba(185, 243, 225, .14); border-radius: 99px; overflow: hidden; }
.bar i { display: block; height: 100%; width: var(--p, 0%); background: var(--mint); border-radius: inherit; transition: width .4s linear; }
.job[data-state="paused"] .bar i { background: #6f8f98; }
.job[data-state="done"] .bar i { background: #6ee7b7; }
.job-btn {
  grid-column: 3; grid-row: 1 / span 3; width: 36px; height: 36px; border-radius: 50%;
  border: 1px solid rgba(185, 243, 225, .3); background: transparent; color: var(--mint); cursor: pointer; display: grid; place-items: center;
}
.job-btn:hover { background: var(--ink-2); }
.job-btn[hidden] { display: none; }
.job .bar, .job .job-meta { grid-column: 2; }
.queue-foot { font-size: 0.8125rem; color: #9fc3cb; padding-top: 10px; border-top: 1px solid rgba(185, 243, 225, .12); }

/* Sections */
.section { padding: 88px 0; }
.section-alt { background: var(--surface); border-block: 1px solid var(--line); }
.section-head { max-width: 640px; margin-bottom: 40px; }
.section-head p { color: var(--muted); font-size: var(--step-1); }

.shot {
  border-radius: var(--radius-l); overflow: hidden; border: 1px solid #1d3a45;
  background: #151b1f; box-shadow: 0 30px 60px -34px rgba(11, 37, 48, .6);
}
.shot img { width: 100%; height: auto; }
.shot-caption { font-size: var(--step--1); color: var(--muted); margin-top: 12px; }

.features { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px 56px; margin-top: 56px; }
.feature { display: grid; grid-template-columns: 44px minmax(0, 1fr); gap: 16px; }
.feature-icon { width: 44px; height: 44px; border-radius: 12px; background: var(--mint-soft); color: var(--teal-strong); display: grid; place-items: center; }
.feature p { color: var(--muted); margin: 0; }

/* Steps — đây là trình tự thật nên có đánh số */
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; counter-reset: step; }
.steps li { counter-increment: step; padding: 0 28px 0 0; position: relative; }
.steps li::before {
  content: counter(step); display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%;
  background: var(--ink); color: var(--mint); font-weight: 700; margin-bottom: 18px; position: relative; z-index: 1;
}
.steps li:not(:last-child)::after {
  content: ""; position: absolute; top: 20px; left: 48px; right: 8px; height: 2px;
  background: repeating-linear-gradient(90deg, var(--teal) 0 8px, transparent 8px 14px);
}
.steps p { color: var(--muted); margin: 0; }

/* FAQ */
.faq { max-width: 760px; }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  cursor: pointer; list-style: none; padding: 20px 40px 20px 0; font-weight: 600; color: var(--ink); position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; position: absolute; right: 8px; top: 50%; width: 10px; height: 10px; margin-top: -7px;
  border-right: 2px solid var(--teal); border-bottom: 2px solid var(--teal); transform: rotate(45deg); transition: transform .2s;
}
.faq details[open] summary::after { transform: rotate(-135deg); margin-top: -2px; }
.faq details > div { padding: 0 0 20px; color: var(--muted); max-width: 64ch; }


/* Page head (trang con) */
.page-head { padding: 56px 0 32px; }
.page-head h1 { font-size: clamp(2rem, 4.5vw, 3rem); font-weight: 800; letter-spacing: -0.035em; }
.page-head p { color: var(--muted); font-size: var(--step-1); max-width: 60ch; margin: 0; }

.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-l); padding: 32px; }
.panel + .panel { margin-top: 24px; }
.panel h2 { font-size: var(--step-2); }

/* Download */
.dl-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 24px; align-items: start; }
.dl-main h2 { margin-bottom: 4px; }
.dl-options { display: grid; gap: 12px; margin: 24px 0; }
.dl-option { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 16px 18px; border: 1px solid var(--line); border-radius: var(--radius-m); }
.dl-option strong { display: block; color: var(--ink); }
.dl-option span { font-size: var(--step--1); color: var(--muted); }
.facts { display: grid; grid-template-columns: max-content 1fr; gap: 10px 20px; margin: 0; font-size: var(--step--1); }
.facts dt { color: var(--muted); }
.facts dd { margin: 0; color: var(--ink); font-weight: 500; }
.hash { display: flex; gap: 8px; align-items: stretch; margin-top: 8px; }
.hash code {
  flex: 1; min-width: 0; overflow-wrap: anywhere; background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius-s);
  padding: 10px 12px; font-family: "Cascadia Code", Consolas, monospace; font-size: 0.8125rem; color: var(--ink);
}
.changelog { list-style: none; margin: 0; padding: 0; }
.changelog > li { padding: 18px 0; border-top: 1px solid var(--line); }
.changelog > li:first-child { border-top: 0; padding-top: 0; }
.changelog h3 { margin-bottom: 2px; }
.changelog time { font-size: var(--step--1); color: var(--muted); }
.changelog ul { margin: 8px 0 0; padding-left: 20px; color: var(--muted); }

ol.howto { padding-left: 22px; margin: 0; }
ol.howto li { padding-left: 6px; margin-bottom: 10px; }

/* Login */
.auth { min-height: min(calc(100vh - 69px), 760px); display: grid; place-items: center; padding: 56px 0; }
.auth-card { width: min(100% - 32px, 440px); background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-l); padding: 40px 36px; text-align: center; }
.auth-card img.mark { width: 56px; height: 56px; margin: 0 auto 20px; }
.auth-card h1 { font-size: var(--step-3); font-weight: 800; letter-spacing: -0.03em; }
.auth-card p { color: var(--muted); }
.btn-google { width: 100%; background: #fff; color: #1f1f1f; border: 1px solid #747775; font-weight: 500; margin-top: 12px; }
.btn-google:hover { background: #f6f8f8; color: #1f1f1f; }
.auth-legal { font-size: var(--step--1); margin: 24px 0 0; }

/* Alerts */
.alert { display: flex; gap: 12px; align-items: flex-start; padding: 14px 16px; border-radius: var(--radius-m); border: 1px solid; font-size: var(--step--1); text-align: left; margin-bottom: 20px; }
.alert p { margin: 0; }
.alert strong { display: block; }
.alert-info { background: var(--mint-soft); border-color: #a7e3cf; color: var(--ink); }
.alert-warn { background: #fff6e0; border-color: #f0d494; color: #4d3500; }
.alert-error { background: #fdecea; border-color: #f1b8b3; color: #5f1410; }
.alert[hidden] { display: none; }

.spinner { width: 18px; height: 18px; border-radius: 50%; border: 2px solid currentColor; border-right-color: transparent; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Account */
.account-grid { display: grid; grid-template-columns: 340px 1fr; gap: 24px; align-items: start; }
.account-grid > .panel + .panel { margin-top: 0; }
.profile { text-align: left; }
.avatar { width: 72px; height: 72px; border-radius: 50%; background: var(--teal); color: #fff; display: grid; place-items: center; font-size: var(--step-2); font-weight: 700; margin-bottom: 16px; }
.profile h2 { margin-bottom: 2px; }
.profile .email { color: var(--muted); margin-bottom: 20px; overflow-wrap: anywhere; }
.status-list { list-style: none; margin: 0 0 24px; padding: 0; display: grid; gap: 12px; }
.status-list li { display: flex; justify-content: space-between; gap: 12px; font-size: var(--step--1); }
.status-list span:first-child { color: var(--muted); }
.pill { display: inline-flex; align-items: center; gap: 6px; padding: 2px 10px; border-radius: 99px; font-size: 0.8125rem; font-weight: 600; }
.pill::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.pill-ok { background: #e3f4e3; color: var(--ok); }
.pill-free { background: var(--mint-soft); color: var(--teal-strong); }
.pill-bad { background: #fdecea; color: var(--danger); }
.devices { list-style: none; margin: 0; padding: 0; }
.device { display: grid; grid-template-columns: 40px minmax(0, 1fr) auto; gap: 14px; align-items: center; padding: 16px 0; border-top: 1px solid var(--line); }
.device:first-child { border-top: 0; }
.device-icon { width: 40px; height: 40px; border-radius: 10px; background: var(--paper); color: var(--teal-strong); display: grid; place-items: center; }
.device strong { display: block; color: var(--ink); font-weight: 600; }
.device span { font-size: var(--step--1); color: var(--muted); }
.device .tag { color: var(--teal-strong); font-weight: 600; }
.empty { text-align: center; padding: 32px 0; color: var(--muted); }

.preview-bar {
  background: #fff6e0; border-bottom: 1px solid #f0d494; color: #4d3500; font-size: var(--step--1);
}
.preview-bar .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; padding: 8px 0; }
.preview-bar a { color: #4d3500; }

/* Nối backend: trang tài khoản, đăng nhập phần mềm */
[hidden] { display: none !important; }
.account-loading { display: flex; align-items: center; gap: 12px; color: var(--muted); padding: 24px 0; }
.link-btn { background: none; border: 0; padding: 0; font: inherit; color: var(--teal-strong); text-decoration: underline; text-underline-offset: 3px; cursor: pointer; }
.link-btn:hover { color: var(--ink); }
.avatar-img { object-fit: cover; padding: 0; }
.account-id { font-family: "Cascadia Mono", Consolas, monospace; font-size: 0.8125rem; color: var(--ink); }
.admin-link { margin: 18px 0 0; padding-top: 16px; border-top: 1px solid var(--line); font-size: var(--step--1); }
.btn-google.is-loading { pointer-events: none; opacity: .75; }
.account-chip {
  display: flex; align-items: center; gap: 12px; text-align: left; margin: 20px 0;
  padding: 12px 14px; border: 1px solid var(--line); border-radius: var(--radius-m); background: var(--paper);
}
.account-chip img, .account-chip > span:first-child {
  width: 40px; height: 40px; border-radius: 50%; flex: none; object-fit: cover;
  display: grid; place-items: center; background: var(--teal); color: #fff; font-weight: 700;
}
.account-chip > span:last-child { display: grid; min-width: 0; line-height: 1.35; }
.account-chip strong { color: var(--ink); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.account-chip small { color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.confirm-actions { display: grid; gap: 10px; }
.confirm-actions .btn { width: 100%; }
.dev-form { display: grid; gap: 14px; text-align: left; margin-top: 8px; }
.dev-form label { display: grid; gap: 6px; font-weight: 600; font-size: var(--step--1); color: var(--ink); }
.dev-form input {
  min-height: 44px; padding: 0 12px; border: 1px solid var(--line); border-radius: var(--radius-s);
  font: 400 var(--step-0) var(--font); color: var(--text);
}
.dev-form input:focus { outline: none; border-color: var(--teal); box-shadow: 0 0 0 3px rgba(22, 122, 146, .2); }
.auth-card code { font-size: 0.8125rem; background: var(--paper); padding: 1px 5px; border-radius: 4px; }

/* Legal / guide */
.doc { padding-bottom: 88px; }
.doc .panel { max-width: 820px; }
.doc h2 { font-size: var(--step-2); margin-top: 1.6em; }
.doc h2:first-child { margin-top: 0; }
.doc ul, .doc ol { padding-left: 22px; }
.doc li { margin-bottom: 6px; }
.updated { color: var(--muted); font-size: var(--step--1); }

/* Footer */
.site-footer { background: var(--ink); color: #a9c7ce; font-size: var(--step--1); }
.site-footer a { color: #dcecef; text-decoration: none; }
.site-footer a:hover { color: var(--mint); text-decoration: underline; }
.footer-cta {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px 32px;
  padding: 56px 0 48px; border-bottom: 1px solid rgba(185, 243, 225, .14);
}
.footer-cta h2 { color: #fff; font-size: var(--step-3); margin: 0 0 6px; }
.footer-cta p { margin: 0; font-size: var(--step-0); }
.site-footer .btn-mint { background: var(--mint); color: var(--ink); text-decoration: none; }
.site-footer .btn-mint:hover { background: #fff; color: var(--ink); text-decoration: none; }
.footer-grid {
  display: grid; grid-template-columns: minmax(0, 1.6fr) repeat(3, minmax(0, 1fr)); gap: 32px;
  padding: 48px 0 40px;
}
.footer-brand .brand { color: #fff; margin-bottom: 14px; }
.footer-brand p { max-width: 34ch; margin: 0; }
.footer-col h3 { color: var(--mint); font-size: var(--step--1); font-weight: 600; letter-spacing: 0; margin: 0 0 14px; }
.footer-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.footer-base {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px;
  padding: 20px 0 28px; border-top: 1px solid rgba(185, 243, 225, .14);
}
.footer-lang { display: flex; align-items: center; gap: 12px; }
.site-footer .lang-switch { background: transparent; border-color: rgba(185, 243, 225, .25); }
.site-footer .lang-switch svg { color: #a9c7ce; }
.site-footer .lang-switch a { color: #a9c7ce; padding: 4px 12px; }
.site-footer .lang-switch a:hover { color: #fff; text-decoration: none; }
.site-footer .lang-switch a[aria-current="true"] { background: var(--mint); color: var(--ink); }

/* Responsive */
@media (max-width: 900px) {
  .hero { padding: 40px 0 64px; }
  .hero .wrap, .dl-grid, .account-grid { grid-template-columns: minmax(0, 1fr); }
  .features { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .steps { grid-template-columns: 1fr; gap: 28px; }
  .steps li { padding: 0 0 0 56px; }
  .steps li::before { position: absolute; left: 0; top: 0; margin: 0; }
  .steps li:not(:last-child)::after { top: 48px; bottom: -24px; left: 19px; right: auto; width: 2px; height: auto; background: repeating-linear-gradient(180deg, var(--teal) 0 8px, transparent 8px 14px); }
  .section { padding: 64px 0; }

  /* Header thu gọn: logo, nút tải và nút menu */
  .site-header > .wrap { flex-wrap: wrap; min-height: 60px; padding-block: 10px; }
  .header-dl { margin-left: auto; }
  .nav-toggle {
    display: inline-flex; align-items: center; gap: 8px; min-height: 38px; padding: 0 12px;
    background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-s);
    font: 600 var(--step--1) var(--font); color: var(--ink); cursor: pointer;
  }
  .nav-toggle[aria-expanded="true"] { background: var(--ink); color: var(--mint); border-color: var(--ink); }
  .header-menu {
    display: none; order: 5; width: 100%; flex: none; flex-direction: column; align-items: stretch; gap: 8px;
    padding: 4px 0 16px;
  }
  .header-menu.open { display: flex; }
  .nav { flex-direction: column; }
  .nav a { padding: 12px; font-size: var(--step-0); }
  .header-tools { margin: 4px 0 0; padding: 12px 12px 0; border-top: 1px solid var(--line); justify-content: space-between; }
  .signin { font-size: var(--step-0); padding: 8px 0; }

  .footer-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 760px) {
  .panel { padding: 24px 20px; }
  .auth-card { padding: 32px 22px; }
  .dl-option { flex-direction: column; align-items: stretch; }
  .actions .btn { flex: 1 1 100%; }
  .footer-cta { padding: 40px 0 36px; }
  .footer-cta .btn { width: 100%; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); padding: 36px 0 32px; }
}
@media (max-width: 420px) {
  .header-dl { padding: 0 12px; }
  .header-dl svg { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}