:root {
  --bg: #ffffff; --bg-alt: #f7f5fb; --ink: #1d1530; --ink-soft: #5b5470; --line: #e7e2f0;
  --brand: #7c3aed; --brand-2: #ec4899; --brand-soft: #f1e9ff; --ok: #0f9d58; --err: #d93025;
  --radius: 14px; --shadow: 0 1px 2px rgba(29,21,48,.05), 0 8px 24px rgba(29,21,48,.06);
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .6em; }
h1 { font-size: clamp(28px, 4.5vw, 46px); letter-spacing: -.02em; }
h2 { font-size: clamp(22px, 3vw, 32px); }
h3 { font-size: 18px; }
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 760px; margin-left: auto; margin-right: auto; }
.center { text-align: center; }
.muted { color: var(--ink-soft); }
.small { font-size: 13px; }
.eyebrow { color: var(--brand); font-weight: 600; font-size: 14px; letter-spacing: .04em; }
.lead { font-size: 18px; color: var(--ink-soft); }

/* buttons */
.btn { display: inline-block; border: 1px solid transparent; border-radius: 10px; padding: 9px 18px; font: inherit; font-weight: 600; cursor: pointer; text-decoration: none !important; }
.btn-primary { background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff; }
.btn-primary:hover { filter: brightness(1.05); }
.btn-primary:disabled { opacity: .6; cursor: wait; }
.btn-ghost { background: #fff; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }
.btn-lg { padding: 13px 26px; font-size: 17px; }
.btn-sm { padding: 6px 12px; font-size: 14px; }
.linkish { background: none; border: 0; padding: 0; color: var(--brand); font: inherit; cursor: pointer; }

/* nav */
.nav { position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.nav-inner { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 800; font-size: 19px; color: var(--ink); text-decoration: none !important; }
.brand span { color: var(--brand); }
.nav-links { display: flex; gap: 20px; flex: 1; }
.nav-links a { color: var(--ink-soft); font-size: 15px; }
.nav-cta { display: flex; gap: 8px; }

/* layout */
.section { padding: 64px 0; }
.section.alt { background: var(--bg-alt); }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); margin-bottom: 16px; }
.grid-3, .grid-4 { display: grid; gap: 18px; margin-top: 28px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* hero */
.hero { padding: 72px 0 56px; background: radial-gradient(1200px 400px at 80% 0, var(--brand-soft), transparent); }
.hero-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: center; }
.hero-cta { display: flex; gap: 12px; margin: 24px 0 10px; flex-wrap: wrap; }
.demo { font-size: 14px; }
.demo .label { display: inline-block; font-size: 12px; font-weight: 700; color: var(--brand); background: var(--brand-soft); border-radius: 6px; padding: 2px 8px; }
.demo-input { border-bottom: 1px dashed var(--line); padding-bottom: 12px; margin-bottom: 12px; }
.demo-title { font-weight: 700; }
.demo ul { padding-left: 18px; margin: 8px 0; }
.tags { color: var(--brand); }
.feature .icon { font-size: 28px; }
.feature p, .tool-link p { color: var(--ink-soft); font-size: 15px; margin: 0; }
.tool-link { display: block; color: var(--ink); text-decoration: none !important; transition: border-color .15s; }
.tool-link:hover { border-color: var(--brand); }
.step span { display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 50%; background: var(--brand); color: #fff; font-weight: 700; margin-bottom: 10px; }
details { border-bottom: 1px solid var(--line); padding: 14px 0; }
details summary { cursor: pointer; font-weight: 600; }
details p { color: var(--ink-soft); }
.cta-band { background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff; }
.cta-band p { opacity: .9; }
.cta-band .btn-primary { background: #fff; color: var(--brand); }

/* pricing */
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; margin-top: 32px; }
.plan { position: relative; display: flex; flex-direction: column; }
.plan ul { padding-left: 18px; color: var(--ink-soft); font-size: 14px; flex: 1; }
.plan .btn { width: 100%; text-align: center; }
.plan form { margin: 0; }
.plan-popular { border-color: var(--brand); box-shadow: 0 0 0 2px var(--brand-soft), var(--shadow); }
.price { font-size: 30px; font-weight: 800; margin: 0; }
.price span { font-size: 14px; font-weight: 400; color: var(--ink-soft); }
.badge { position: absolute; top: -11px; right: 16px; background: var(--brand); color: #fff; font-size: 12px; font-weight: 700; padding: 2px 10px; border-radius: 99px; }
.pricing-notes { margin-top: 40px; color: var(--ink-soft); }

/* forms */
.form label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 14px; }
.form input:not([type=checkbox]), .form select, .form textarea { display: block; width: 100%; margin-top: 6px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; font: inherit; font-weight: 400; background: #fff; }
.form input:focus, .form select:focus, .form textarea:focus { outline: 2px solid var(--brand-soft); border-color: var(--brand); }
.form .check { font-weight: 400; }
.form .row { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; }
.auth { max-width: 420px; }
.flashes { margin-top: 16px; }
.flash { padding: 10px 14px; border-radius: 10px; margin-bottom: 8px; }
.flash-error { background: #fdecea; color: var(--err); }
.flash-success { background: #e6f4ea; color: var(--ok); }
.error { color: var(--err); }

/* app */
.section.app { padding-top: 32px; }
.app-grid { display: grid; grid-template-columns: 200px 1fr; gap: 28px; align-items: start; }
.app-nav { display: flex; flex-direction: column; gap: 4px; position: sticky; top: 84px; }
.app-nav a, .app-nav .linkish { padding: 8px 12px; border-radius: 8px; color: var(--ink); text-align: left; }
.app-nav a.active { background: var(--brand-soft); color: var(--brand); font-weight: 600; }
.app-nav form { margin: 0; }
.usage { display: flex; gap: 20px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.tabs { display: flex; gap: 6px; margin-bottom: 12px; }
.tab { border: 1px solid var(--line); background: #fff; border-radius: 99px; padding: 6px 16px; font: inherit; cursor: pointer; }
.tab.active { background: var(--ink); color: #fff; border-color: var(--ink); }
.result h4 { margin: 18px 0 6px; font-size: 14px; color: var(--ink-soft); display: flex; justify-content: space-between; align-items: center; }
.result h4:first-child { margin-top: 0; }
.result .out { white-space: pre-wrap; background: var(--bg-alt); border-radius: 10px; padding: 12px; }
.copy { font-size: 12px; }
.pill { display: inline-block; background: var(--brand-soft); color: var(--brand); border-radius: 6px; padding: 1px 8px; font-size: 12px; margin-right: 6px; }
.history-item summary { font-weight: 400; }
pre { white-space: pre-wrap; word-break: break-all; background: var(--bg-alt); padding: 12px; border-radius: 10px; font-size: 13px; }
.key { font-size: 15px; }
.shop-item { display: flex; justify-content: space-between; align-items: center; }
.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th, .table td { border-bottom: 1px solid var(--line); padding: 8px; text-align: left; }
.kv th { text-align: left; padding: 6px 16px 6px 0; vertical-align: top; color: var(--ink-soft); font-weight: 500; white-space: nowrap; }

/* legal / prose */
.legal-grid { display: grid; grid-template-columns: 200px 1fr; gap: 40px; }
.legal-nav { display: flex; flex-direction: column; gap: 4px; position: sticky; top: 84px; align-self: start; }
.legal-nav a { color: var(--ink-soft); padding: 6px 0; }
.legal-nav a.active { color: var(--brand); font-weight: 600; }
.prose { max-width: 760px; }
.prose h2 { font-size: 20px; margin-top: 1.6em; }

/* footer */
.footer { border-top: 1px solid var(--line); background: var(--bg-alt); padding: 48px 0 24px; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 24px; }
.footer-grid h4 { margin: 0 0 10px; }
.footer-grid a:not(.brand) { display: block; color: var(--ink-soft); margin-bottom: 6px; }
.footer-company { border-top: 1px solid var(--line); margin-top: 32px; padding-top: 20px; color: var(--ink-soft); font-size: 13px; }
.footer-company p { margin: 4px 0; }

@media (max-width: 900px) {
  .nav-links { display: none; }
  .hero-grid, .grid-3, .grid-4, .app-grid, .legal-grid, .footer-grid { grid-template-columns: 1fr; }
  .app-nav, .legal-nav { position: static; flex-direction: row; flex-wrap: wrap; }
  .section { padding: 44px 0; }
}

[hidden] { display: none !important; }