:root {
    --bg: #fafafa;
    --surface: #ffffff;
    --surface-2: #f4f4f5;
    --border: #e4e4e7;
    --border-strong: #d4d4d8;
    --text: #0a0a0a;
    --text-soft: #3f3f46;
    --text-mute: #71717a;
    --primary: #10b981;
    --primary-2: #059669;
    --primary-soft: #ecfdf5;
    --primary-edge: #d1fae5;
    --accent: #0a0a0a;
    --success: #10b981;
    --success-soft: #ecfdf5;
    --danger: #dc2626;
    --danger-soft: #fef2f2;
    --warn: #d97706;
    --warn-soft: #fffbeb;
    --radius: 10px;
    --radius-lg: 14px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow: 0 6px 20px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.10);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 15px;
    line-height: 1.6;
    letter-spacing: -0.01em;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-2); }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
    background: rgba(255,255,255,0.85);
    backdrop-filter: saturate(180%) blur(8px);
    border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 50;
}
.site-header .row {
    display: flex; align-items: center; justify-content: space-between;
    height: 64px;
}
.brand {
    display: flex; align-items: center; gap: 10px;
    font-weight: 700; font-size: 17px; color: var(--text);
}
.brand-mark {
    width: 30px; height: 30px; border-radius: 8px;
    background: var(--accent);
    color: var(--primary); display: inline-flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: 14px; letter-spacing: -0.5px;
}
.site-header nav { display: flex; gap: 24px; }
.site-header nav a {
    color: var(--text-soft); font-weight: 500; font-size: 14px;
}
.site-header nav a:hover { color: var(--primary); }
.site-header nav a.active { color: var(--primary); }

/* Hero */
.hero {
    text-align: center;
    padding: 64px 20px 40px;
}
.hero .eyebrow {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 12px; font-weight: 600; letter-spacing: 0.5px;
    margin-bottom: 16px;
}
.hero h1 {
    font-size: 38px; line-height: 1.2; margin: 0 0 12px;
    font-weight: 700; letter-spacing: -0.5px;
}
.hero h1 .grad {
    color: var(--primary);
}
.hero p.lead {
    color: var(--text-soft); font-size: 16px;
    max-width: 560px; margin: 0 auto;
}

/* Card */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 28px;
}
.card + .card { margin-top: 16px; }
.card h2 {
    margin: 0 0 6px; font-size: 18px; font-weight: 600;
}
.card .card-sub {
    color: var(--text-soft); font-size: 14px; margin: 0 0 20px;
}

/* Service grid */
.service-grid {
    display: grid; gap: 16px;
    grid-template-columns: repeat(3, 1fr);
    margin: 32px 0 48px;
}
@media (max-width: 720px) { .service-grid { grid-template-columns: 1fr; } }
.service-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
    cursor: pointer; display: block; color: inherit;
}
.service-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    border-color: var(--border-strong);
}
.service-card .icon {
    width: 44px; height: 44px; border-radius: 10px;
    display: inline-flex; align-items: center; justify-content: center;
    background: var(--primary-soft); color: var(--primary);
    margin-bottom: 14px;
}
.service-card h3 { margin: 0 0 6px; font-size: 16px; font-weight: 600; }
.service-card p { margin: 0; color: var(--text-soft); font-size: 14px; }
.service-card .arrow {
    display: inline-flex; margin-top: 12px;
    color: var(--primary); font-size: 14px; font-weight: 500;
}

/* Forms */
.field { display: block; margin-bottom: 16px; }
.field label {
    display: block; font-size: 13px; font-weight: 500;
    color: var(--text-soft); margin-bottom: 6px;
}
.input, textarea.input {
    width: 100%;
    padding: 11px 14px;
    border: 1px solid var(--border-strong);
    border-radius: 10px;
    background: var(--surface);
    font-size: 15px; color: var(--text);
    font-family: inherit;
    transition: border-color .15s, box-shadow .15s;
    outline: none;
}
.input:focus, textarea.input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
}
.input.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: 0.5px; }
.input-hint { font-size: 12px; color: var(--text-mute); margin-top: 6px; }
textarea.input { min-height: 160px; resize: vertical; }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    padding: 10px 18px;
    border-radius: 10px;
    border: 1px solid transparent;
    font-size: 14px; font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: transform .1s, box-shadow .15s, opacity .15s;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
.btn-primary {
    color: #fff;
    background: var(--accent);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06);
}
.btn-primary:hover:not(:disabled) { background: #1f1f23; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12); }
.btn-ghost {
    background: var(--surface-2); color: var(--text);
    border-color: var(--border-strong);
}
.btn-ghost:hover:not(:disabled) { background: var(--primary-soft); color: var(--primary); border-color: var(--primary); }
.btn-block { display: flex; width: 100%; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 8px; }

/* Stepper */
.stepper {
    display: flex; gap: 8px; margin: 0 0 28px; padding: 0; list-style: none;
}
.stepper li {
    flex: 1; display: flex; align-items: center; gap: 10px;
    padding: 12px 14px;
    background: var(--surface-2); border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 13px; color: var(--text-mute);
}
.stepper li .num {
    width: 24px; height: 24px; border-radius: 999px;
    display: inline-flex; align-items: center; justify-content: center;
    background: var(--border); color: var(--text-mute); font-weight: 700; font-size: 12px;
    flex-shrink: 0;
}
.stepper li.active { background: var(--primary-soft); border-color: var(--primary); color: var(--primary); }
.stepper li.active .num { background: var(--primary); color: #fff; }
.stepper li.done { background: var(--success-soft); border-color: var(--success); color: var(--success); }
.stepper li.done .num { background: var(--success); color: #fff; }
@media (max-width: 720px) {
    .stepper li em { display: none; }
}

/* Notice */
.notice {
    border-radius: 10px;
    padding: 12px 14px;
    font-size: 13px;
    margin: 12px 0;
    line-height: 1.6;
}
.notice.info { background: var(--primary-soft); color: var(--primary); }
.notice.warn { background: var(--warn-soft); color: #b45309; }
.notice.error { background: var(--danger-soft); color: var(--danger); }
.notice.success { background: var(--success-soft); color: var(--success); }
.notice ul { margin: 6px 0 0; padding-left: 20px; }

/* KV pairs */
.kv {
    display: grid; grid-template-columns: 120px 1fr;
    gap: 10px 16px; font-size: 14px;
    padding: 12px 0; border-top: 1px solid var(--border);
}
.kv:first-of-type { border-top: 0; padding-top: 0; }
.kv .k { color: var(--text-soft); }
.kv .v { color: var(--text); word-break: break-all; }
.kv .v.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

/* Table */
table.results {
    width: 100%; border-collapse: collapse; font-size: 14px;
    margin-top: 16px;
}
table.results th, table.results td {
    text-align: left; padding: 10px 12px;
    border-bottom: 1px solid var(--border);
}
table.results th {
    font-weight: 600; color: var(--text-soft); font-size: 13px;
    background: var(--surface-2);
}
table.results td.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

.tag {
    display: inline-block; padding: 2px 8px; border-radius: 999px;
    font-size: 12px; font-weight: 500;
}
.tag.ok { background: var(--success-soft); color: var(--success); }
.tag.bad { background: var(--danger-soft); color: var(--danger); }
.tag.warn { background: var(--warn-soft); color: #b45309; }
.tag.mute { background: var(--surface-2); color: var(--text-mute); border: 1px solid var(--border); }

/* Filter chips */
.filter-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.chip {
    padding: 4px 12px; border-radius: 999px;
    font-size: 13px; font-weight: 500;
    background: var(--surface-2); border: 1px solid var(--border);
    color: var(--text-soft); cursor: pointer;
}
.chip.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* Toast */
#toast-root {
    position: fixed; top: 24px; left: 50%; transform: translateX(-50%);
    z-index: 1000; pointer-events: none;
    display: flex; flex-direction: column; gap: 8px; align-items: center;
}
.toast {
    background: #1a1d2e; color: #fff;
    padding: 10px 16px; border-radius: 10px;
    font-size: 14px; box-shadow: var(--shadow-lg);
    pointer-events: auto;
    animation: toast-in .2s ease-out;
}
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
@keyframes toast-in { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: translateY(0); } }

/* Spinner */
.spin {
    width: 14px; height: 14px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 999px;
    animation: spin .8s linear infinite;
    display: inline-block;
}
.btn-ghost .spin { border-color: rgba(0,0,0,0.18); border-top-color: var(--text); }
@keyframes spin { to { transform: rotate(360deg); } }

/* Footer */
.site-footer {
    margin-top: 80px; padding: 24px 20px;
    text-align: center; color: var(--text-mute); font-size: 13px;
    border-top: 1px solid var(--border); background: var(--surface);
}

/* Hidden */
.hide { display: none !important; }

/* Section */
section.page { padding: 32px 0 64px; }

/* FAQ */
details.faq {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 12px; padding: 14px 18px; margin-bottom: 10px;
}
details.faq summary {
    cursor: pointer; font-weight: 600; font-size: 15px;
    list-style: none; outline: none;
}
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::before {
    content: "+"; display: inline-block; width: 20px;
    color: var(--primary); font-weight: 700; margin-right: 6px;
}
details.faq[open] summary::before { content: "−"; }
details.faq p { margin: 10px 0 0; color: var(--text-soft); font-size: 14px; }