:root {
  --bg: #f6f7fb; --surface: #ffffff; --surface-2: #f1f3f8; --ink: #141826; --muted: #5d6475; --line: #e2e5ee;
  --brand: #3b5bdb; --brand-ink: #ffffff; --brand-soft: #e8edff; --ok: #1f9d55; --ok-soft: #e3f6ec;
  --warn: #c2410c; --warn-soft: #fff1e8; --bad: #c92a2a; --bad-soft: #ffe9e9;
  --radius: 12px; --shadow: 0 1px 2px rgba(16,24,40,.05), 0 4px 16px rgba(16,24,40,.06);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1219; --surface: #171b25; --surface-2: #1e2330; --ink: #e8ebf3; --muted: #9aa3b5; --line: #2a3040;
    --brand: #6f8cff; --brand-ink: #0b0e14; --brand-soft: #1f2a4d; --ok: #3ccf7f; --ok-soft: #133524;
    --warn: #ff9a5c; --warn-soft: #3a2416; --bad: #ff7676; --bad-soft: #3d1c1c; --shadow: none;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5rem; }
h1 { font-size: 1.9rem; } h2 { font-size: 1.35rem; } h3 { font-size: 1.05rem; }
p { margin: 0 0 .8rem; }
.container { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 760px; }
.muted { color: var(--muted); }
.small { font-size: .86rem; }

/* nav */
.nav { background: var(--surface); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.nav .container { display: flex; align-items: center; gap: 18px; min-height: 60px; flex-wrap: wrap; }
.logo { font-weight: 800; font-size: 1.15rem; color: var(--ink); display: flex; align-items: center; gap: 8px; }
.logo:hover { text-decoration: none; }
.logo i { width: 26px; height: 26px; border-radius: 7px; background: var(--brand); display: inline-grid; place-items: center;
  color: var(--brand-ink); font-style: normal; font-size: .9rem; }
.nav-links { display: flex; gap: 14px; align-items: center; margin-left: auto; flex-wrap: wrap; }
.nav-links a { color: var(--muted); font-weight: 500; }
.nav-links a.active, .nav-links a:hover { color: var(--ink); text-decoration: none; }
.credit-pill { background: var(--brand-soft); color: var(--brand); border-radius: 999px; padding: 3px 10px; font-size: .82rem; font-weight: 600; }

main { padding: 28px 0 60px; }
.footer { border-top: 1px solid var(--line); padding: 22px 0; color: var(--muted); font-size: .86rem; }
.footer .container { display: flex; gap: 16px; flex-wrap: wrap; justify-content: space-between; }

/* surfaces */
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.card + .card { margin-top: 16px; }
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.split { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(300px, 1fr); gap: 20px; align-items: start; }
@media (max-width: 900px) { .grid-2, .grid-3, .split { grid-template-columns: 1fr; } }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.spread { justify-content: space-between; }
.stack > * + * { margin-top: 12px; }

/* buttons + forms */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; border: 1px solid var(--line);
  background: var(--surface); color: var(--ink); padding: 9px 16px; border-radius: 9px; font: inherit; font-weight: 600;
  cursor: pointer; text-decoration: none; }
.btn:hover { text-decoration: none; border-color: var(--muted); }
.btn-primary { background: var(--brand); border-color: var(--brand); color: var(--brand-ink); }
.btn-primary:hover { filter: brightness(1.07); border-color: var(--brand); }
.btn-danger { color: var(--bad); }
.btn-sm { padding: 6px 11px; font-size: .86rem; }
.btn-lg { padding: 13px 22px; font-size: 1.02rem; }
.btn[disabled] { opacity: .55; cursor: not-allowed; }
label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: 5px; }
input[type=text], input[type=email], input[type=password], input[type=url], input[type=file], select, textarea {
  width: 100%; padding: 9px 11px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface);
  color: var(--ink); font: inherit; }
textarea { resize: vertical; min-height: 70px; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--brand); outline-offset: 0; border-color: var(--brand); }
input[type=checkbox] { width: auto; accent-color: var(--brand); }
.field { margin-bottom: 14px; }
.field .help { color: var(--muted); font-size: .82rem; margin-top: 4px; }
.errorlist { list-style: none; padding: 0; margin: 4px 0; color: var(--bad); font-size: .86rem; }
.check { display: flex; gap: 8px; align-items: center; font-weight: 500; }
.or { text-align: center; color: var(--muted); font-size: .85rem; margin: 6px 0 12px; }

/* messages */
.messages { list-style: none; padding: 0; margin: 0 0 18px; }
.messages li { padding: 11px 14px; border-radius: 9px; margin-bottom: 8px; background: var(--brand-soft); color: var(--ink); }
.messages .success { background: var(--ok-soft); }
.messages .error { background: var(--bad-soft); }
.messages .warning { background: var(--warn-soft); }

/* badges / scores */
.badge { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: .78rem; font-weight: 700; background: var(--surface-2); color: var(--muted); }
.badge.ok { background: var(--ok-soft); color: var(--ok); }
.badge.warn { background: var(--warn-soft); color: var(--warn); }
.badge.bad { background: var(--bad-soft); color: var(--bad); }
.score-ring { --v: 0; width: 112px; height: 112px; border-radius: 50%; display: grid; place-items: center; flex: none;
  background: conic-gradient(var(--c, var(--brand)) calc(var(--v) * 1%), var(--surface-2) 0); }
.score-ring > div { width: 88px; height: 88px; border-radius: 50%; background: var(--surface); display: grid; place-items: center; text-align: center; }
.score-ring b { font-size: 1.8rem; line-height: 1; display: block; }
.score-ring span { font-size: .72rem; color: var(--muted); }
.kw { display: inline-block; padding: 3px 9px; margin: 3px 4px 3px 0; border-radius: 6px; font-size: .84rem; background: var(--surface-2); }
.kw.hit { background: var(--ok-soft); color: var(--ok); }
.kw.miss { background: var(--bad-soft); color: var(--bad); }
.issue-list { padding-left: 18px; margin: 0; }
.issue-list li { margin-bottom: 6px; }

/* progress */
.progress { height: 10px; background: var(--surface-2); border-radius: 999px; overflow: hidden; }
.progress > div { height: 100%; width: 0; background: var(--brand); transition: width .6s ease; }
.task-box { text-align: center; padding: 36px 20px; }
.spinner { width: 34px; height: 34px; border: 3px solid var(--surface-2); border-top-color: var(--brand); border-radius: 50%;
  animation: spin 1s linear infinite; margin: 0 auto 14px; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation: none; } .progress > div { transition: none; } }

/* tables / lists */
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { text-align: left; padding: 11px 8px; border-bottom: 1px solid var(--line); vertical-align: middle; }
.table th { font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.table-wrap { overflow-x: auto; }
.empty { text-align: center; padding: 40px 16px; color: var(--muted); }

/* preview */
.preview-frame { width: 100%; height: 1000px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 14px; flex-wrap: wrap; }
.tabs button { background: none; border: 0; padding: 9px 14px; font: inherit; font-weight: 600; color: var(--muted); cursor: pointer;
  border-bottom: 2px solid transparent; margin-bottom: -1px; }
.tabs button.on { color: var(--ink); border-bottom-color: var(--brand); }
.tab-panel[hidden] { display: none; }
.sticky { position: sticky; top: 76px; }

/* editor */
.ed-section { border: 1px solid var(--line); border-radius: 10px; padding: 14px; margin-bottom: 14px; background: var(--surface); }
.ed-section > h3 { display: flex; justify-content: space-between; align-items: center; }
.ed-item { border: 1px dashed var(--line); border-radius: 8px; padding: 12px; margin-bottom: 10px; background: var(--surface-2); }
.ed-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 10px; }
.ed-item .field { margin-bottom: 8px; }

/* landing */
.hero { padding: 54px 0 30px; text-align: center; }
.hero h1 { font-size: clamp(2rem, 4.5vw, 3.1rem); letter-spacing: -.02em; max-width: 860px; margin: 0 auto 14px; }
.hero p.lead { font-size: 1.15rem; color: var(--muted); max-width: 700px; margin: 0 auto 24px; }
.feature h3 { display: flex; gap: 8px; align-items: center; }
.step-n { width: 30px; height: 30px; border-radius: 50%; background: var(--brand-soft); color: var(--brand); display: inline-grid; place-items: center; font-weight: 800; }
.note { background: var(--brand-soft); border-radius: 10px; padding: 12px 14px; font-size: .92rem; }
.warn-box { background: var(--warn-soft); border-radius: 10px; padding: 12px 14px; font-size: .92rem; }
.auth { max-width: 430px; margin: 20px auto; }
.nav-links a.btn-primary, .nav-links a.btn-primary:hover { color: var(--brand-ink); }