:root {
  --ink: #24392e; --muted: #53675c; --accent: #28654f; --line: #dce5df;
  --surface: #fff; --background: #f2f5f3; --soft: #e8f1eb; --focus: #28654f;
  font-family: "Segoe UI", "Microsoft YaHei UI", "PingFang SC", sans-serif;
  color: var(--ink); background: var(--background); font-synthesis: none;
}
* { box-sizing: border-box; }
body { margin: 0; min-width: 0; line-height: 1.65; }
a { color: var(--accent); text-underline-offset: .2em; }
a:focus-visible, button:focus-visible, summary:focus-visible, [tabindex]:focus-visible { outline: 3px solid var(--focus); outline-offset: 4px; }
header { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem; max-width: 1104px; margin: auto; padding: 1.5rem; border-bottom: 1px solid var(--line); }
.brand { color: var(--accent); font-size: 1.2rem; font-weight: 750; letter-spacing: -.04em; text-decoration: none; }
.back { min-height: 44px; display: inline-flex; align-items: center; gap: .5rem; font-size: .9rem; }
main { max-width: 1008px; margin: auto; padding: 2.5rem 1.5rem 1.5rem; }
.intro { max-width: 720px; }
.eyebrow { margin: 0 0 .5rem; color: var(--accent); font-weight: 650; }
h1 { font-size: clamp(1.8rem, 4vw, 2.65rem); line-height: 1.25; letter-spacing: -.045em; margin: 0 0 1rem; }
.lead { font-size: 1.05rem; color: var(--muted); }
h2 { font-size: 1.2rem; line-height: 1.4; margin: 0; }
h3 { margin: 0; font-size: 1rem; }
p { margin: .5rem 0 0; }
section { margin-top: 2.5rem; }
.availability { display: flex; align-items: start; gap: 1rem; justify-content: space-between; border: 1px solid var(--line); border-left: 4px solid var(--accent); background: var(--surface); padding: 1.25rem; border-radius: 8px; }
.availability p { color: var(--muted); font-size: .95rem; }
.status-label { flex: none; color: var(--accent); background: var(--soft); border-radius: 6px; padding: .25rem .75rem; font-size: .8rem; font-weight: 650; }
.section-heading { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: .75rem; margin-bottom: 1rem; }
.section-heading > span { color: var(--muted); font-size: .85rem; }
.table-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); }
table { width: 100%; border-collapse: collapse; text-align: left; font-size: .92rem; }
th, td { padding: 1rem; border-bottom: 1px solid var(--line); }
thead { color: var(--muted); background: #f7f9f7; }
thead th { font-weight: 500; }
tbody th { font-weight: 600; }
tbody tr:last-child > * { border-bottom: 0; }
td:last-child { text-align: right; font-variant-numeric: tabular-nums; font-weight: 750; }
thead th:last-child { text-align: right; white-space: nowrap; }
code { font-family: "Cascadia Code", Consolas, monospace; font-size: .88em; }
td code { white-space: nowrap; }
.note { color: var(--muted); font-size: .85rem; margin-top: .75rem; overflow-wrap: anywhere; }
.steps { list-style: none; counter-reset: step; margin: 1.25rem 0 0; padding: 0; display: grid; gap: 1.25rem; }
.steps li { counter-increment: step; position: relative; padding-left: 2.75rem; }
.steps li::before { content: counter(step, decimal-leading-zero); position: absolute; top: 0; left: 0; color: var(--accent); font-size: .9rem; font-weight: 650; }
.steps p { color: var(--muted); font-size: .95rem; }
button { min-height: 44px; border: 1px solid var(--accent); color: var(--accent); background: var(--surface); border-radius: 8px; padding: .5rem 1rem; font: inherit; font-size: .9rem; cursor: pointer; }
button:hover { background: var(--soft); }
pre { margin-top: 1rem; overflow: auto; max-width: 100%; background: #193c30; color: #f0f6f1; padding: 1.25rem; border-radius: 8px; tab-size: 4; }
pre code { font-size: .8rem; line-height: 1.6; }
#copy-status { min-height: 1.5rem; font-size: .85rem; color: var(--accent); }
details { border-top: 1px solid var(--line); padding-top: 1rem; margin-top: 1rem; font-size: .92rem; }
summary { min-height: 44px; cursor: pointer; font-weight: 600; }
details p { color: var(--muted); }
footer { max-width: 1008px; margin: auto; padding: 2rem 1.5rem calc(2rem + env(safe-area-inset-bottom, 0px)); color: var(--muted); font-size: .8rem; }
.skip-link { position: fixed; left: 1rem; top: -5rem; background: var(--surface); padding: .5rem 1rem; }
.skip-link:focus { top: 1rem; }
@media (max-width: 520px) { header { padding: 1rem; } main { padding: 1.5rem 1rem; } .availability { flex-direction: column; } th, td { padding: .75rem; } .status-label { align-self: start; } footer { padding-inline: 1rem; } }
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto; } }

[hidden] { display: none !important; }
.key-panel { padding: 1.4rem; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.key-panel .section-heading { margin-bottom: .8rem; }
#create-key-form { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: .7rem 1rem; margin: 1rem 0; }
#create-key-form > label { grid-column: 1 / -1; font-size: .9rem; font-weight: 600; }
input[type="text"], #key-name { min-width: 0; width: 100%; min-height: 44px; padding: .7rem .8rem; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--ink); font: inherit; }
#key-name { grid-column: 1; grid-row: 2; }
#create-key { grid-column: 2; grid-row: 2; background: var(--accent); color: white; }
fieldset { grid-column: 1 / -1; margin: 0; padding: 0; border: 0; display: flex; flex-wrap: wrap; align-items: center; gap: 1.4rem; }
legend { float: left; padding: 0 1rem 0 0; color: var(--muted); font-size: .9rem; }
fieldset label { display: inline-flex; align-items: center; gap: .4rem; min-height: 40px; }
input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--accent); }
input:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
button:disabled { opacity: .55; cursor: default; }
.new-key-panel { display: grid; gap: .8rem; padding: 1rem; margin: 1rem 0; border: 1px solid #8db39b; border-radius: 10px; background: #eef8f1; }
.new-key-panel p { font-size: .9rem; color: var(--muted); margin: 0; }
#new-key-value { font: .85rem "Cascadia Code", Consolas, monospace; }
.key-actions { display: flex; flex-wrap: wrap; gap: .6rem; }
.key-panel .table-scroll { margin: 1rem 0; }
.key-panel th strong, #model-prices th strong { display: block; font-size: .9rem; }
.key-panel th code, #model-prices th code { display: block; margin-top: .3rem; color: var(--muted); font-weight: 400; font-size: .75rem; }
.key-panel td { font-size: .8rem; min-width: 75px; }
.base-url { display: block; border: 1px solid var(--line); border-radius: 8px; padding: 1rem; background: var(--surface); overflow-wrap: anywhere; }
#key-status, #models-status { color: var(--muted); font-size: .9rem; min-height: 1.5em; }
#key-status.is-error { color: #a83d25; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
@media (max-width: 520px) {
  .key-panel { padding: 1rem; }
  #create-key-form { grid-template-columns: minmax(0, 1fr); }
  #create-key { grid-column: 1; grid-row: 4; }
  .key-actions > button { flex: 1 1 140px; }
}