:root {
  --bg: #fafafa; --card: #fff; --ink: #1a1a1a; --muted: #666;
  --line: #e8e8e8; --brand: #6c3ef5; --brand-d: #5529d6;
  --ok: #1a9e54; --warn: #c2410c; --radius: 12px;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--ink); line-height: 1.6; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar { display: flex; justify-content: space-between; align-items: center; padding: 12px 20px; background: var(--card); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.brand { font-weight: 700; font-size: 18px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.topbar nav { display: flex; gap: 14px; align-items: center; font-size: 14px; }
.topbar nav a { color: var(--muted); }
.topbar nav a:hover { color: var(--ink); }
.credits-pill { background: #f3edff; color: var(--brand-d); border-radius: 999px; padding: 2px 12px; font-weight: 600; }
.lang { border: 1px solid var(--line); border-radius: 999px; padding: 2px 10px !important; }
form.inline { display: inline; margin: 0; }
.linklike { background: none; border: none; color: var(--muted); cursor: pointer; font-size: 14px; padding: 0; }
.linklike:hover { color: var(--ink); }

.wrap { max-width: 960px; margin: 0 auto; padding: 28px 20px 60px; }
.foot { text-align: center; color: var(--muted); font-size: 13px; padding: 24px; border-top: 1px solid var(--line); }

.hero { text-align: center; padding: 60px 20px 40px; }
.hero h1 { font-size: 34px; margin: 0 0 12px; }
.hero p { color: var(--muted); font-size: 17px; max-width: 640px; margin: 0 auto 28px; }
.btn { display: inline-block; background: var(--brand); color: #fff !important; border: none; border-radius: 8px; padding: 12px 28px; font-size: 16px; cursor: pointer; }
.btn:hover { background: var(--brand-d); text-decoration: none; }
.btn.small { padding: 6px 14px; font-size: 14px; }
.btn.ghost { background: #fff; color: var(--ink) !important; border: 1px solid var(--line); }
.btn.ghost:hover { border-color: var(--brand); }
.btn:disabled { opacity: .6; cursor: wait; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; margin-bottom: 20px; }
.card h2, .card h3 { margin-top: 0; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 16px; }
.tool-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; display: block; color: var(--ink); transition: .15s; }
.tool-card:hover { text-decoration: none; border-color: var(--brand); transform: translateY(-2px); box-shadow: 0 6px 18px rgba(108,62,245,.08); }
.tool-card .icon { font-size: 28px; }
.tool-card h3 { margin: 8px 0 6px; font-size: 17px; }
.tool-card p { margin: 0; color: var(--muted); font-size: 14px; }
.tool-card.soon { opacity: .65; }

.stat-row { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 24px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 24px; flex: 1; min-width: 180px; }
.stat .k { color: var(--muted); font-size: 13px; }
.stat .v { font-size: 26px; font-weight: 700; }

.field { margin-bottom: 18px; }
.field label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 15px; }
.field .req { color: #d33; font-size: 12px; font-weight: 400; margin-left: 6px; }
.field input[type=text], .field input[type=email], .field input[type=password],
.field textarea, .field select { width: 100%; border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; font-size: 15px; font-family: inherit; background: #fff; }
.field textarea { resize: vertical; }
.field input:focus, .field textarea:focus, .field select:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(108,62,245,.12); }
.hint { color: var(--muted); font-size: 13px; margin: 4px 0 14px; }
.checkrow { display: flex; gap: 8px; align-items: center; font-weight: 600; }

.alert { border-radius: 8px; padding: 12px 16px; margin-bottom: 18px; font-size: 14px; }
.alert.err { background: #fdecec; color: #b3261e; border: 1px solid #f5c6c2; }
.alert.ok { background: #e7f6ee; color: var(--ok); border: 1px solid #bfe8cf; }
.alert .btn { margin-left: 10px; }

.auth-box { max-width: 420px; margin: 40px auto; }

table.list { width: 100%; border-collapse: collapse; font-size: 14px; }
table.list th, table.list td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); }
table.list th { color: var(--muted); font-weight: 600; }
.delta-pos { color: var(--ok); font-weight: 600; }
.delta-neg { color: #b3261e; }

.result-body { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.result-body h1, .result-body h2, .result-body h3 { margin-top: 1.4em; }
.result-body table { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: 14px; }
.result-body th, .result-body td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }
.result-body th { background: #f6f6f8; }
.result-body code { background: #f1f1f4; padding: 1px 6px; border-radius: 4px; font-size: .92em; }
.result-body pre { background: #f6f6f8; padding: 14px; border-radius: 8px; overflow-x: auto; }
.result-actions { display: flex; gap: 12px; margin: 18px 0; flex-wrap: wrap; }
.meta { color: var(--muted); font-size: 13px; }

.price-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; margin: 20px 0; }
.price-card { background: var(--card); border: 2px solid var(--line); border-radius: var(--radius); padding: 24px; }
.price-card.hot { border-color: var(--brand); }
.price-card h3 { margin-top: 0; }
.price { font-size: 30px; font-weight: 700; margin: 8px 0; }
.price small { font-size: 14px; color: var(--muted); font-weight: 400; }

@media (max-width: 640px) {
  .hero h1 { font-size: 26px; }
  .topbar nav { gap: 10px; font-size: 13px; }
  .wrap { padding: 20px 14px 50px; }
}