:root {
    --primary: #667eea;
    --primary-dark: #5568d3;
    --ink: #1f2430;
    --muted: #667085;
    --line: #e6e8f0;
    --bg: #f5f7fb;
    --card: #ffffff;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--ink);
    background: var(--bg);
}

a { color: inherit; }

.nav {
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(255, 255, 255, .92);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(10px);
}

.nav-inner, .wrap {
    width: min(1080px, calc(100% - 32px));
    margin: 0 auto;
}

.nav-inner {
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-weight: 700;
    letter-spacing: .04em;
}

.nav a.menu {
    margin-left: 18px;
    text-decoration: none;
    color: var(--muted);
}

.hero { text-align: center; padding: 72px 0 28px; }

.badge {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 999px;
    background: #eef1ff;
    color: var(--primary-dark);
    font-size: 13px;
}

.hero h1 {
    margin: 16px 0 8px;
    font-size: 48px;
    line-height: 1.15;
}

.hero p, .detail {
    margin: 0 auto;
    max-width: 640px;
    color: var(--muted);
    line-height: 1.7;
}

.hero .summary-html {
    margin: 16px auto 0;
    text-align: center;
}

.hero .summary-html img {
    display: block;
    margin: 12px auto;
    max-width: min(100%, 920px);
    height: auto;
}

.summary-rich {
    margin: 12px auto 0;
    max-width: 760px;
    text-align: left;
    color: var(--ink);
    line-height: 1.75;
    font-size: 16px;
}
.summary-rich p { margin: 0 0 12px; }
.summary-rich h1, .summary-rich h2, .summary-rich h3, .summary-rich h4 { margin: 18px 0 8px; line-height: 1.3; }
.summary-rich ul, .summary-rich ol { display: block; text-align: left; margin: 8px 0 14px; padding-left: 1.4em; }
.summary-rich img { max-width: 100%; height: auto; }
.summary-rich table { width: 100%; border-collapse: collapse; margin: 12px 0; }
.summary-rich td, .summary-rich th { border: 1px solid var(--line); padding: 6px 8px; }

.price {
    margin-top: 18px;
    font-size: 28px;
    font-weight: 700;
}

.price span { font-size: 14px; color: var(--muted); font-weight: 500; }

.btn {
    display: inline-block;
    margin-top: 18px;
    padding: 12px 22px;
    border: 0;
    border-radius: 10px;
    background: var(--primary);
    color: #fff;
    text-decoration: none;
    cursor: pointer;
    font-size: 15px;
}

.btn:hover { background: var(--primary-dark); }

.btn.ghost {
    background: #fff;
    color: var(--primary-dark);
    border: 1px solid #d5dbff;
}

.features, .steps {
    display: grid;
    gap: 14px;
    margin: 28px 0;
}

.features { grid-template-columns: repeat(3, 1fr); }

.steps { grid-template-columns: repeat(3, 1fr); }

.card, .step, .panel {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 22px;
}

.step-num {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: #eef1ff;
    color: var(--primary-dark);
    font-weight: 700;
}

.product { margin: 10px 0 40px; }

.product h2 { margin: 0 0 8px; }

.folder {
    color: var(--muted);
    line-height: 1.7;
}

code {
    padding: 2px 6px;
    border-radius: 6px;
    background: #f2f4f8;
}

footer {
    padding: 10px 0 36px;
    text-align: center;
    color: var(--muted);
    font-size: 13px;
}

.form label, .admin-form label {
    display: block;
    margin: 14px 0 6px;
    font-size: 14px;
}

input[type="text"], input[type="password"], textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--line);
    border-radius: 10px;
    font: inherit;
}

textarea { min-height: 96px; resize: vertical; }

.pay-box { text-align: center; }

.amount {
    font-size: 36px;
    font-weight: 800;
    letter-spacing: .02em;
}

.addr {
    margin: 12px 0;
    padding: 12px;
    border-radius: 10px;
    background: #f6f7fb;
    word-break: break-all;
    font-family: Consolas, monospace;
}

.warn {
    color: #b54708;
    background: #fff6ed;
    border-radius: 10px;
    padding: 10px 12px;
}

.ok {
    color: #067647;
    background: #ecfdf3;
    border-radius: 10px;
    padding: 10px 12px;
}

.err {
    color: #b42318;
    background: #fef3f2;
    border-radius: 10px;
    padding: 10px 12px;
}

@media (max-width: 800px) {
    .hero h1 { font-size: 34px; }
    .features, .steps { grid-template-columns: 1fr; }
}