/* ============================================================
   Codex++ 官网 · 使用教程页
   沿用 site.css 的色板与顶栏 / 页脚，只补文档排版
   ============================================================ */

/* ============ 页头 ============ */

.g-hero {
  position: relative;
  padding: 72px 24px 64px;
  text-align: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line-soft);
  background: radial-gradient(60% 80% at 50% 0%, var(--brand-soft), transparent 70%), var(--bg-0);
}
.g-hero .eyebrow { justify-content: center; }
.g-hero h1 {
  font-size: clamp(34px, 5.4vw, 60px);
  font-weight: 900;
  line-height: 1.2;
  margin: 18px 0 14px;
}
.g-hero h1 em { font-style: normal; color: var(--brand); }
.g-hero-sub { color: var(--txt-2); font-size: 15.5px; max-width: 640px; margin: 0 auto; }

.g-quick {
  max-width: 980px;
  margin: 44px auto 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  text-align: left;
}
.g-quick a {
  display: block;
  padding: 18px 18px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  transition: border-color 0.25s, transform 0.35s var(--ease-out);
}
.g-quick a:hover { border-color: var(--brand); transform: translateY(-3px); }
.g-quick .no { font-family: var(--mono); font-size: 12px; color: var(--indigo); }
.g-quick b { display: block; font-size: 15px; margin: 6px 0 4px; }
.g-quick span:last-child { display: block; font-size: 13px; color: var(--txt-2); line-height: 1.6; }

/* ============ 两栏布局 ============ */

.g-layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 56px 28px 96px;
  display: grid;
  grid-template-columns: 232px minmax(0, 1fr);
  gap: 56px;
  align-items: start;
}

.g-toc {
  position: sticky;
  top: calc(var(--nav-h) + 24px);
  max-height: calc(100vh - var(--nav-h) - 44px);
  overflow-y: auto;
  padding-right: 6px;
  font-size: 13.5px;
}
.g-toc summary {
  list-style: none;
  cursor: default;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.24em;
  color: var(--txt-2);
  margin-bottom: 12px;
}
.g-toc summary::-webkit-details-marker { display: none; }
.g-toc ol { list-style: none; border-left: 1px solid var(--line-soft); }
.g-toc li a {
  display: block;
  padding: 5px 0 5px 14px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--txt-2);
  line-height: 1.5;
  transition: color 0.2s, border-color 0.2s;
}
.g-toc li a:hover { color: var(--txt-0); }
.g-toc li a.active { color: var(--txt-0); border-left-color: var(--indigo); }
.g-toc .toc-group {
  padding: 14px 0 4px 14px;
  font-size: 11.5px;
  color: var(--txt-2);
  letter-spacing: 0.08em;
}
.g-toc .toc-group:first-child { padding-top: 2px; }

/* ============ 正文 ============ */

.g-doc { max-width: 800px; min-width: 0; }
.g-doc section { scroll-margin-top: calc(var(--nav-h) + 24px); padding-bottom: 56px; }
.g-doc section + section { border-top: 1px solid var(--line-soft); padding-top: 52px; }

.g-doc .kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--indigo);
}
.g-doc h2 {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 900;
  line-height: 1.3;
  margin: 8px 0 16px;
}
.g-doc h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 32px 0 10px;
  scroll-margin-top: calc(var(--nav-h) + 24px);
}
.g-doc p, .g-doc li { color: var(--txt-1); font-size: 15px; line-height: 1.85; }
.g-doc p + p { margin-top: 12px; }
.g-doc b, .g-doc strong { color: var(--txt-0); font-weight: 700; }
.g-doc a:not(.btn) { color: var(--indigo); border-bottom: 1px solid color-mix(in srgb, var(--brand) 35%, transparent); }
.g-doc a:not(.btn):hover { color: var(--brand); border-bottom-color: currentColor; }

.g-doc ul { margin: 10px 0 0 1.2em; }
.g-doc ul li + li { margin-top: 4px; }
.g-doc ul li::marker { color: var(--txt-2); }

.g-doc code {
  font-family: var(--mono);
  font-size: 0.86em;
  color: var(--indigo);
  background: var(--brand-soft);
  border: 1px solid color-mix(in srgb, var(--brand) 18%, transparent);
  border-radius: 5px;
  padding: 1px 6px;
  overflow-wrap: anywhere;
}
.g-doc pre {
  margin: 14px 0 0;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg-1);
  overflow-x: auto;
}
.g-doc pre code { background: none; border: 0; padding: 0; color: var(--txt-1); font-size: 13.5px; line-height: 1.8; }
.g-doc pre .c { color: var(--txt-2); }
.g-doc pre .h { color: var(--cyan); }

kbd {
  font-family: var(--mono);
  font-size: 0.82em;
  color: var(--txt-0);
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 1px 6px;
}

/* 界面里的按钮 / 菜单名 */
.ui {
  display: inline-block;
  font-size: 0.92em;
  color: var(--txt-0);
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0 7px;
  line-height: 1.65;
  white-space: nowrap;
}

/* 编号步骤 */
.g-steps { list-style: none; margin: 18px 0 0; counter-reset: gs; }
.g-steps > li {
  counter-increment: gs;
  position: relative;
  padding: 0 0 18px 46px;
}
.g-steps > li::before {
  content: counter(gs);
  position: absolute;
  left: 0; top: 1px;
  width: 28px; height: 28px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--on-brand);
  background: var(--brand);
}
.g-steps > li:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 13.5px; top: 34px; bottom: 4px;
  width: 1px;
  background: var(--line);
}
.g-steps > li > b:first-child { display: block; margin-bottom: 2px; }

/* 提示框 */
.g-note {
  margin: 18px 0 0;
  padding: 14px 16px 14px 44px;
  position: relative;
  border: 1px solid color-mix(in srgb, var(--brand) 26%, transparent);
  border-radius: 10px;
  background: var(--brand-soft);
}
.g-note::before {
  content: "i";
  position: absolute;
  left: 15px; top: 16px;
  width: 18px; height: 18px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font: 700 12px/1 var(--mono);
  color: var(--on-brand);
  background: var(--brand);
}
.g-note.warn { border-color: color-mix(in srgb, var(--warn) 30%, transparent); background: color-mix(in srgb, var(--warn) 8%, transparent); }
.g-note.warn::before { content: "!"; background: var(--amber); }
.g-note.ok { border-color: color-mix(in srgb, var(--ok) 30%, transparent); background: color-mix(in srgb, var(--ok) 8%, transparent); }
.g-note.ok::before { content: "✓"; background: var(--green); }
.g-note p, .g-note li { font-size: 14px; }

/* 表格 */
.g-table { margin: 16px 0 0; border: 1px solid var(--line); border-radius: 10px; overflow-x: auto; }
.g-table table { width: 100%; border-collapse: collapse; font-size: 14px; }
.g-table th, .g-table td { padding: 11px 14px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line-soft); }
.g-table th { color: var(--txt-2); font-weight: 500; font-size: 12.5px; background: var(--bg-1); white-space: nowrap; }
.g-table td { color: var(--txt-1); line-height: 1.7; }
.g-table td:first-child { color: var(--txt-0); font-weight: 600; white-space: nowrap; }
.g-table tr:last-child td { border-bottom: 0; }

/* 截图 */
.g-shot { margin: 20px 0 0; }
.g-shot a {
  display: block;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg-1);
  box-shadow: var(--shadow);
  transition: border-color 0.25s;
}
.g-shot a:hover { border-color: var(--brand); }
.g-shot img { width: 100%; height: auto; }
.g-shot figcaption { margin-top: 10px; color: var(--txt-2); font-size: 13px; text-align: center; }

/* 两种模式对比卡 */
.g-cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 18px; }
.g-card {
  padding: 18px 18px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
}
.g-card .tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  padding: 1px 8px;
  border-radius: 99px;
  color: var(--indigo);
  border: 1px solid color-mix(in srgb, var(--brand) 35%, transparent);
}
.g-card h4 { font-size: 16px; margin: 8px 0 6px; }
.g-card p { font-size: 13.5px; line-height: 1.75; color: var(--txt-2); }

/* FAQ 沿用首页样式，只收紧间距 */
.g-doc .faq-list { max-width: none; margin-top: 18px; padding: 0; }

/* 页尾导航 */
.g-next {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

/* ============ 响应式 ============ */

@media (max-width: 1080px) {
  .g-quick { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .g-layout { grid-template-columns: 1fr; gap: 28px; padding-top: 32px; }
  .g-toc {
    position: static;
    max-height: none;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--panel);
    padding: 14px 16px;
  }
  .g-toc summary { cursor: pointer; margin-bottom: 0; }
  .g-toc summary::after { content: " ▾"; }
  .g-toc[open] summary { margin-bottom: 12px; }
  .g-toc[open] summary::after { content: " ▴"; }
}

@media (max-width: 640px) {
  .g-hero { padding: 56px 16px 48px; }
  .g-quick { grid-template-columns: 1fr; }
  .g-layout { padding-left: 16px; padding-right: 16px; }
  .g-cards { grid-template-columns: 1fr; }
  .g-doc p, .g-doc li { font-size: 14.5px; }
  .g-steps > li { padding-left: 40px; }
  .ui { white-space: normal; }
}