/* Front page and login. Same grayscale palette as the review page. */
:root {
  --ink: #36454f; --slate: #708090; --lightgray: #d3d3d3; --white: #ffffff; --page: #f4f5f6;
  --fill: #36454f; --on-fill: #ffffff; --red: #b3261e;
}
:root[data-theme="dark"] {
  --ink: #e4e8eb; --slate: #9aa7b3; --lightgray: #38424b; --white: #1b2127; --page: #14181c;
  --fill: #e4e8eb; --on-fill: #14181c; --red: #f28b82;
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: var(--page); color: var(--ink);
  font-family: 'DejaVu Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif; font-size: 15px; line-height: 1.5; }
.wrap { max-width: 760px; margin: 0 auto; padding: 24px 16px 60px; }
.top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 40px; }
.brand { font-weight: 700; letter-spacing: 0.02em; }
.icon-btn { border: 1px solid var(--lightgray); background: var(--white); color: var(--ink); border-radius: 8px;
  width: 34px; height: 30px; font-size: 15px; cursor: pointer; }
h1 { font-size: 30px; line-height: 1.2; margin: 0 0 12px; }
.lead { font-size: 17px; color: var(--slate); margin: 0 0 24px; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.actions form { margin: 0; }
.btn { display: inline-block; font: inherit; font-weight: 600; text-decoration: none; cursor: pointer; border-radius: 8px;
  padding: 10px 18px; background: var(--fill); color: var(--on-fill); border: 1px solid var(--fill); }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--lightgray); }
.btn:hover { opacity: .88; }
.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 40px 0 16px; }
.card { background: var(--white); border: 1px solid var(--lightgray); border-radius: 10px; padding: 14px 16px; }
.card h2 { font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--slate); margin: 0 0 6px; }
.card p { margin: 0; font-size: 14px; }
.note { color: var(--slate); font-size: 13px; }
/* login */
.panel { max-width: 380px; margin: 10vh auto 0; background: var(--white); border: 1px solid var(--lightgray); border-radius: 12px; padding: 24px; }
.panel h1 { font-size: 22px; margin-bottom: 16px; }
label { display: block; font-size: 13px; color: var(--slate); margin: 14px 0 4px; }
input { width: 100%; font: inherit; color: var(--ink); background: var(--page); border: 1px solid var(--lightgray); border-radius: 8px; padding: 9px 11px; }
input:focus { outline: 2px solid var(--slate); outline-offset: 1px; }
.panel .btn { width: 100%; margin-top: 20px; }
.error { color: var(--red); font-size: 13px; margin: 12px 0 0; }
.notice { border: 1px solid var(--ink); border-radius: 8px; padding: 10px 12px; font-size: 13px; margin-bottom: 8px; }
.notice:empty, .error:empty { display: none; }
.back { display: block; text-align: center; margin-top: 16px; color: var(--slate); font-size: 13px; }
@media (max-width: 600px) { .cards { grid-template-columns: 1fr; } h1 { font-size: 25px; } }