/* CC-173: the landing page's styles, from the signed-off mockup (2 Nov 2026), with the tool's colours (styles-v3.css). */
:root {
  --display: "Source Serif 4", Georgia, "Times New Roman", serif;
  --body: "Public Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --bg: #F6F6F8; --paper: #FFFFFF; --ink: #1C1B22; --muted: #5E5C6B; --line: #E3E2E8;
  --accent: #5B45C2; --accent-strong: #4F3BB0; --accent-text: #3F2E9E; --accent-soft: #EEEBFA; --accent-line: #B9AEEA;
  --chip-text: #45434F; --btn-text: #FFFFFF;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121117; --paper: #1C1B23; --ink: #ECEBF2; --muted: #A9A6B6; --line: #33313D;
    --accent: #6F5BD8; --accent-strong: #AFA2F7; --accent-text: #CDC4FF; --accent-soft: #2E2850; --accent-line: #5A4FA0;
    --chip-text: #C2C0CD;
  }
}
*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.5 var(--body); }
a:focus-visible, .btn:focus-visible { outline: 3px solid var(--accent-line); outline-offset: 2px; }

.top { display: flex; align-items: center; justify-content: space-between; padding: 0 64px; height: 72px; border-bottom: 1px solid var(--line); background: var(--paper); }
.brand { font: 600 22px/1.1 var(--display); letter-spacing: .02em; }
.brand small { display: block; font: 13px var(--body); color: var(--muted); letter-spacing: 0; margin-top: 2px; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 20px; border-radius: 8px; font: 600 15px var(--body); text-decoration: none; }
.btn.primary { background: var(--accent); color: var(--btn-text); }
.btn.primary:hover { background: var(--accent-strong); }
.btn.ghost { border: 1px solid var(--accent-line); color: var(--accent-text); background: transparent; }
.btn.big { min-height: 52px; padding: 0 28px; font-size: 17px; }

main { max-width: 1440px; margin: 0 auto; }
.hero { display: grid; grid-template-columns: 1.15fr 1fr; gap: 64px; padding: 88px 64px 72px; align-items: center; }
h1 { font: 600 56px/1.08 var(--display); margin: 0 0 20px; color: var(--accent-strong); text-wrap: balance; }
.sub { font-size: 20px; line-height: 1.5; margin: 0 0 32px; max-width: 34em; }
.send { margin: 16px 0 0; font-size: 15px; color: var(--muted); }
.send a { color: var(--accent-text); }

.example { background: var(--paper); border: 1px solid var(--line); border-radius: 12px; padding: 24px; box-shadow: 0 8px 24px rgba(0, 0, 0, .06); }
.ex-tag { font: 600 12px var(--body); color: var(--muted); text-transform: uppercase; letter-spacing: .08em; margin-bottom: 14px; }
.status { display: inline-block; font: 600 13px var(--body); padding: 4px 10px; border-radius: 6px; background: var(--accent-soft); color: var(--accent-text); margin-bottom: 10px; }
.ex-sentence { font: 600 20px/1.35 var(--display); margin: 0 0 18px; }
.opts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.opt { border: 1px solid var(--line); border-radius: 8px; padding: 12px; font-size: 13px; line-height: 1.4; color: var(--chip-text); }
.opt b { display: block; color: var(--ink); font-size: 14px; margin-bottom: 4px; }

.cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; padding: 56px 64px; background: var(--paper); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
h2 { font: 600 26px/1.2 var(--display); margin: 0 0 14px; color: var(--accent-strong); }
.cols p { margin: 0 0 12px; font-size: 16px; line-height: 1.55; }
.cols .lead { font-weight: 600; }

.talk { display: flex; align-items: center; justify-content: space-between; gap: 32px; padding: 56px 64px; }
.talk p { margin: 0; font: 600 26px/1.3 var(--display); max-width: 26em; }
.talk p span { display: block; font: 16px var(--body); color: var(--muted); margin-top: 8px; }

.foot { padding: 20px 64px; border-top: 1px solid var(--line); font-size: 13px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 6px 14px; }
.foot a { color: var(--muted); }

@media (max-width: 900px) {
  .top { padding: 0 20px; height: 60px; }
  .brand { font-size: 19px; }
  .brand small { font-size: 12px; }
  .top .btn { min-height: 44px; padding: 0 14px; font-size: 14px; }
  .hero { grid-template-columns: 1fr; gap: 32px; padding: 40px 20px; }
  h1 { font-size: 36px; }
  .sub { font-size: 17px; margin-bottom: 24px; }
  .btn.big { width: 100%; }
  .example { padding: 18px; }
  .ex-sentence { font-size: 18px; }
  .opts { grid-template-columns: 1fr; }
  .cols { grid-template-columns: 1fr; gap: 28px; padding: 40px 20px; }
  h2 { font-size: 23px; }
  .talk { flex-direction: column; align-items: stretch; padding: 40px 20px; gap: 20px; }
  .talk p { font-size: 22px; }
  .foot { padding: 20px; flex-direction: column; }
}