/* Earglish static site. Colors mirror the app palette (docs/design-system.md, ColorTokens.kt);
   the Google button colors are fixed by Google's branding guidelines and are not app tokens. */
:root {
  color-scheme: light dark;
  --font: "Noto Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --bg: #F8FAFC; --surface: #FFFFFF; --container: #F1F5F9; --text: #15171A; --text-2: #526176;
  --border: #E2E8F0; --outline: #64748B; --primary: #0066CC; --on-primary: #FFFFFF;
  --error: #C62828; --on-error: #FFFFFF; --error-container: #FEE2E2; --on-error-container: #7F1D1D;
  --success-container: #D1FAE5; --on-success-container: #064E3B;
  --disabled-bg: #E2E8F0; --disabled-fg: #94A3B8;
  --gb-fill: #FFFFFF; --gb-stroke: #747775; --gb-text: #1F1F1F;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0F172A; --surface: #1E293B; --container: #28364C; --text: #F1F5F9; --text-2: #A8B6CC;
    --border: #334155; --outline: #94A3B8; --primary: #3B9EFF; --on-primary: #00264D;
    --error: #F87171; --on-error: #3B0A0A; --error-container: #991B1B; --on-error-container: #FEE2E2;
    --success-container: #065F46; --on-success-container: #D1FAE5;
    --disabled-bg: #334155; --disabled-fg: #64748B;
    --gb-fill: #131314; --gb-stroke: #8E918F; --gb-text: #E3E3E3;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 400 16px/1.6 var(--font); }
a { color: var(--primary); }
a:focus-visible, button:focus-visible, input:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

.wrap { max-width: 720px; margin: 0 auto; padding: 0 20px 64px; }
header.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 20px 0; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--text); text-decoration: none; font-weight: 600; font-size: 18px; }
.brand img { width: 36px; height: 36px; border-radius: 8px; display: block; }
.langs { display: inline-flex; border: 1px solid var(--border); border-radius: 999px; overflow: hidden; background: var(--surface); }
.langs button { font: 500 13px/1 var(--font); border: 0; background: transparent; color: var(--text-2); padding: 8px 14px; cursor: pointer; }
.langs button[aria-pressed="true"] { background: var(--primary); color: var(--on-primary); }

h1 { font-size: 28px; line-height: 36px; font-weight: 600; margin: 16px 0 8px; }
h2 { font-size: 20px; line-height: 28px; font-weight: 600; margin: 32px 0 8px; }
p, li { color: var(--text); }
.muted { color: var(--text-2); }
ul, ol { padding-left: 22px; }
li + li { margin-top: 4px; }

/* Language switching: one block per language, the other is hidden. */
html[data-lang="vi"] [lang="en"], html[data-lang="en"] [lang="vi"] { display: none !important; }

table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--border); }
th { color: var(--text-2); font-weight: 500; font-size: 13px; letter-spacing: .4px; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 20px; margin: 16px 0; }
.card > :first-child { margin-top: 0; }
.card > :last-child { margin-bottom: 0; }
.banner { display: flex; gap: 12px; border-radius: 12px; padding: 12px 16px; margin: 12px 0; background: var(--error-container); color: var(--on-error-container); font-size: 15px; }
.banner.ok { background: var(--success-container); color: var(--on-success-container); }
.banner p { margin: 0; color: inherit; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 40px; padding: 10px 24px; border: 0; border-radius: 16px;
  font: 500 14px/20px var(--font); letter-spacing: .1px; cursor: pointer; width: 100%; text-decoration: none; }
.btn.danger { background: var(--error); color: var(--on-error); }
.btn.outlined { background: transparent; color: var(--primary); border: 1px solid var(--outline); }
.btn:disabled { background: var(--disabled-bg); color: var(--disabled-fg); cursor: not-allowed; }

/* Google sign-in button: colors and text per Google's branding guidelines. */
.gbtn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; width: 100%; height: 40px; padding: 0 12px; border-radius: 20px;
  background: var(--gb-fill); color: var(--gb-text); border: 1px solid var(--gb-stroke); font: 500 14px/20px "Google Sans", Roboto, var(--font); cursor: pointer; }
.gbtn img { width: 20px; height: 20px; display: block; }
.gbtn .g-dark { display: none; }
@media (prefers-color-scheme: dark) { .gbtn .g-light { display: none; } .gbtn .g-dark { display: block; } }
.gbtn:disabled { opacity: .6; cursor: wait; }

.check { display: flex; gap: 12px; align-items: flex-start; margin: 16px 0; cursor: pointer; }
.check input { width: 20px; height: 20px; margin: 2px 0 0; flex: none; accent-color: var(--error); }
.actions { display: flex; flex-direction: column; gap: 12px; margin-top: 16px; }
[hidden] { display: none !important; }

footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--border); color: var(--text-2); font-size: 14px; display: flex; gap: 16px; flex-wrap: wrap; }
.hero { padding: 24px 0 8px; }
.hero p { font-size: 18px; color: var(--text-2); }
.links { display: flex; flex-direction: column; gap: 12px; margin-top: 24px; }