:root {
    --bg: #f6f7f9;
    --card: #ffffff;
    --ink: #14181f;
    --muted: #667085;
    --line: #e4e7ec;
    --brand: #0f9d58;
    --brand-ink: #0b7a44;
    --brand-soft: #e7f6ee;
    --danger: #d92d20;
    --danger-soft: #fdecea;
    --warn: #b54708;
    --warn-soft: #fef4e6;
    --code-bg: #0f172a;
    --code-ink: #e2e8f0;
    --radius: 10px;
}
* { 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, sans-serif;
}
a { color: var(--brand-ink); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5em; }
h1 { font-size: 1.6rem; }
h2 { font-size: 1.2rem; }
h3 { font-size: 1rem; }
p { margin: 0 0 1em; }
code, pre { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; font-size: .88em; }
:not(pre) > code { background: #eef0f3; padding: .1em .35em; border-radius: 4px; word-break: break-all; }
pre {
    background: var(--code-bg); color: var(--code-ink);
    padding: 14px 16px; border-radius: var(--radius); overflow-x: auto; line-height: 1.5;
}

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.topbar { background: var(--card); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 12px; }
.brand { font-weight: 700; font-size: 1.1rem; color: var(--ink); display: flex; align-items: center; gap: 8px; }
.brand:hover { text-decoration: none; }
.logo { width: 30px; height: 30px; border-radius: 8px; background: var(--brand); color: #fff; display: grid; place-items: center; }
nav { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
nav a { color: var(--muted); padding: 6px 10px; border-radius: 6px; }
nav a.on, nav a:hover { color: var(--ink); background: var(--bg); text-decoration: none; }
main { padding-top: 28px; padding-bottom: 40px; min-height: 70vh; }
.footer { color: var(--muted); font-size: .85rem; padding-bottom: 30px; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; margin-bottom: 20px; }
.card-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.card-head h2 { margin: 0; }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); }
.row { display: flex; gap: 12px; flex-wrap: wrap; }
.row > * { flex: 1 1 200px; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.mt { margin-top: 16px; }
.right { text-align: right; }

.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    background: var(--brand); color: #fff; border: 0; border-radius: 8px;
    padding: 10px 16px; font: inherit; font-weight: 600; cursor: pointer; white-space: nowrap;
}
.btn:hover { background: var(--brand-ink); text-decoration: none; }
.btn:disabled { opacity: .6; cursor: wait; }
.btn-sm { padding: 6px 12px; font-size: .9rem; color: #fff !important; }
.btn-ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn-ghost:hover { background: var(--bg); }
.btn-danger { background: var(--danger); }
.btn-block { width: 100%; }

label { display: block; font-weight: 600; font-size: .9rem; margin: 0 0 4px; }
.field { margin-bottom: 14px; }
.hint { color: var(--muted); font-size: .82rem; margin-top: 4px; font-weight: 400; }
input[type=text], input[type=email], input[type=password], input[type=tel], input[type=number], input[type=url], select, textarea {
    width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px;
    font: inherit; background: #fff; color: var(--ink);
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--brand-soft); border-color: var(--brand); }
.check { display: flex; gap: 8px; align-items: center; font-weight: 400; }

.alert { padding: 12px 14px; border-radius: 8px; margin-bottom: 18px; border: 1px solid transparent; }
.alert-success { background: var(--brand-soft); color: var(--brand-ink); border-color: #bfe6cf; }
.alert-error { background: var(--danger-soft); color: var(--danger); border-color: #f6c3be; }
.alert-warn { background: var(--warn-soft); color: var(--warn); border-color: #f8d7a8; }

.badge { display: inline-block; padding: 2px 9px; border-radius: 99px; font-size: .78rem; font-weight: 600; }
.badge-active, .badge-success, .badge-sent { background: var(--brand-soft); color: var(--brand-ink); }
.badge-inactive, .badge-none { background: #eef0f3; color: var(--muted); }
.badge-expired, .badge-pending { background: var(--warn-soft); color: var(--warn); }
.badge-suspended, .badge-failed { background: var(--danger-soft); color: var(--danger); }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: .8rem; text-transform: uppercase; letter-spacing: .03em; }

.kv { display: grid; grid-template-columns: 150px 1fr; gap: 8px 14px; align-items: center; }
.kv dt { color: var(--muted); font-size: .88rem; }
.kv dd { margin: 0; min-width: 0; }
.secret { display: flex; gap: 6px; align-items: center; }
.secret code { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.acc-card h3 { margin: 0 0 4px; }
.acc-card .target { color: var(--muted); font-size: .9rem; margin-bottom: 12px; }

/* auth + public pages */
.narrow { max-width: 420px; margin: 20px auto; }
.paypage { max-width: 420px; margin: 10px auto; }
.paypage .amount-big { font-size: 2rem; font-weight: 700; margin: 6px 0 16px; }
.paystate { text-align: center; padding: 12px 0; }
.spinner { width: 36px; height: 36px; border: 4px solid var(--brand-soft); border-top-color: var(--brand); border-radius: 50%; margin: 0 auto 12px; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* landing */
.hero { padding: 40px 0 20px; }
.hero h1 { font-size: 2.3rem; max-width: 700px; }
.hero p { font-size: 1.1rem; color: var(--muted); max-width: 620px; }

/* docs */
.docs { display: grid; grid-template-columns: 210px 1fr; gap: 28px; }
.docs-nav { position: sticky; top: 80px; align-self: start; font-size: .9rem; }
.docs-nav a { display: block; padding: 4px 0; color: var(--muted); }
.docs-nav a:hover { color: var(--ink); }
.docs-nav strong { display: block; margin: 14px 0 4px; font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; }
.docs section { margin-bottom: 36px; scroll-margin-top: 80px; }
.docs h2 { font-size: 1.35rem; border-bottom: 1px solid var(--line); padding-bottom: 8px; margin-bottom: 14px; }
.endpoint { display: flex; gap: 8px; align-items: center; background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; margin-bottom: 14px; flex-wrap: wrap; }
.method { background: var(--brand); color: #fff; font-weight: 700; font-size: .75rem; padding: 2px 8px; border-radius: 4px; }
.req { color: var(--danger); font-weight: 600; font-size: .8rem; }
.opt { color: var(--muted); font-size: .8rem; }

@media (max-width: 760px) {
    .docs { grid-template-columns: 1fr; }
    .docs-nav { position: static; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 14px; }
    .kv { grid-template-columns: 1fr; gap: 2px; }
    .kv dd { margin-bottom: 10px; }
    .hero h1 { font-size: 1.8rem; }
    .topbar-inner { height: auto; padding-top: 10px; padding-bottom: 10px; flex-wrap: wrap; }
}