/* ==========================================================================
   Google Auth Module — 演示页样式
   设计上下文：
     用户   需要给任意站点接 Google 登录的前端开发者 / 独立站长
     任务   调配置 → 看真实渲染 → 核对会话数据 → 复制接入代码
     个性   精密 / 克制 / 可信
     美学   编辑式技术文档：暖灰纸面、非对称分栏、墨色文字、单一交互蓝
            避免三张等宽卡片、紫蓝渐变、居中一切、通用圆角阴影堆叠
   ========================================================================== */

:root {
  --paper: #f6f5f1;
  --surface: #ffffff;
  --surface-2: #fbfaf6;
  --ink: #1b1b19;
  --ink-2: #5e5e57;
  --ink-3: #6f6e66;
  --line: #e2e0d8;
  --line-strong: #cbc9be;
  --accent: #0b57d0;
  --accent-soft: #e9f0fc;
  --ok: #1e7a46;
  --ok-soft: #e7f2eb;
  --err: #b3261e;
  --err-soft: #fbecea;
  --warn: #8a5a08;
  --warn-soft: #faf1dd;
  --focus: #0b57d0;
  --grid-line: rgba(27, 27, 25, .028);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --paper: #151513;
  --surface: #1d1d1a;
  --surface-2: #232320;
  --ink: #f2f1ec;
  --ink-2: #b9b8b0;
  --ink-3: #9b9a91;
  --line: #33332e;
  --line-strong: #4a4a42;
  --accent: #8ab4f8;
  --accent-soft: #1c2b45;
  --ok: #7ddba4;
  --ok-soft: #193020;
  --err: #f2a9a3;
  --err-soft: #3a201f;
  --warn: #e8c37a;
  --warn-soft: #332a17;
  --focus: #8ab4f8;
  --grid-line: rgba(255, 255, 255, .022);
}

/* 宿主页只需覆盖一个变量就能让按钮焦点环适配深色主题 */
[data-theme="dark"] .ga-root { --ga-focus: #8ab4f8; }

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 56px 56px;
}

body > * { position: relative; z-index: 1; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 12px; top: -60px; z-index: 20;
  padding: 10px 16px; background: var(--accent); color: #fff;
  border-radius: 6px; text-decoration: none; font-size: 13px; font-weight: 600;
}
.skip-link:focus { top: 12px; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

.eyebrow {
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--ink-3);
  text-transform: uppercase;
}

code {
  font-family: var(--mono);
  font-size: .9em;
  padding: 1px 5px;
  border-radius: 3px;
  background: var(--surface-2);
  border: 1px solid var(--line);
}

/* --------------------------------------------------------------------------
   顶栏
   -------------------------------------------------------------------------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 62px;
  padding: 0 clamp(20px, 3vw, 44px);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand__name { font-size: 13px; font-weight: 700; letter-spacing: .12em; }
.brand__divider { color: var(--line-strong); }
.brand__sub { font-family: var(--mono); font-size: 11px; color: var(--ink-3); letter-spacing: .08em; }
.brand__mark {
  display: grid; grid-template-columns: repeat(2, 7px); grid-template-rows: repeat(2, 7px);
  gap: 2px; flex: 0 0 auto;
}
.brand__mark i { display: block; border-radius: 1px; }
.brand__mark i:nth-child(1) { background: #4285f4; }
.brand__mark i:nth-child(2) { background: #ea4335; border-radius: 50%; }
.brand__mark i:nth-child(3) { background: #fbbc05; border-radius: 50%; }
.brand__mark i:nth-child(4) { background: #34a853; }

.topbar__meta { display: flex; align-items: center; gap: 14px; }

.env-badge {
  display: inline-flex; align-items: center; min-height: 26px; padding: 0 10px;
  border: 1px solid var(--line-strong); border-radius: 3px;
  font-family: var(--mono); font-size: 10.5px; font-weight: 600; letter-spacing: .08em;
  color: var(--ink-2); background: var(--surface-2);
}
.env-badge[data-kind="live"] { color: var(--ok); border-color: var(--ok); background: var(--ok-soft); }

.icon-btn {
  display: inline-flex; align-items: center; gap: 7px; min-height: 36px; padding: 0 10px;
  border: 1px solid var(--line-strong); border-radius: 5px;
  background: transparent; color: var(--ink-2); cursor: pointer;
  font-size: 12px; font-family: inherit;
  transition: background-color 160ms var(--ease), color 160ms var(--ease);
}
.icon-btn:hover { background: var(--surface-2); color: var(--ink); }
.icon-btn__glyph {
  width: 12px; height: 12px; border-radius: 50%;
  border: 2px solid currentColor;
  background: linear-gradient(90deg, currentColor 50%, transparent 50%);
}
.version { font-family: var(--mono); font-size: 11px; color: var(--ink-3); }

/* --------------------------------------------------------------------------
   主体：非对称双栏
   -------------------------------------------------------------------------- */

.shell {
  display: grid;
  grid-template-columns: minmax(330px, 400px) minmax(0, 1fr);
  max-width: 1440px;
  margin: 0 auto;
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
  background: var(--surface);
}

.config,
.preview { padding: clamp(24px, 3.2vw, 48px); min-width: 0; }

.config { border-right: 1px solid var(--line); }

.config__intro { margin-bottom: 36px; }

.config__intro h1 {
  margin: 18px 0 16px;
  font-size: clamp(30px, 3vw, 42px);
  font-weight: 650;
  line-height: 1.09;
  letter-spacing: -.045em;
}

.lede { margin: 0; max-width: 34ch; color: var(--ink-2); font-size: 14px; line-height: 1.75; }

/* 表单 */
fieldset { margin: 0 0 26px; padding: 0; border: 0; }
legend {
  width: 100%; margin: 0 0 16px; padding: 0 0 8px;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono); font-size: 11px; font-weight: 600;
  letter-spacing: .12em; color: var(--ink-3); text-transform: uppercase;
}

.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; min-width: 0; }
.field label { font-size: 12px; font-weight: 600; color: var(--ink-2); }
.optional { font-weight: 400; color: var(--ink-3); }
.field__hint { font-size: 11.5px; line-height: 1.5; color: var(--ink-3); }

.field input[type="text"],
.field select {
  width: 100%; min-height: 44px; padding: 0 12px;
  border: 1px solid var(--line-strong); border-radius: 5px;
  background: var(--surface); color: var(--ink);
  font-family: inherit; font-size: 13.5px;
  transition: border-color 160ms var(--ease), box-shadow 160ms var(--ease);
}
.field input[type="text"]::placeholder { color: var(--ink-3); }
.field input[type="text"]:focus,
.field select:focus { border-color: var(--accent); }
.field input[type="text"]:focus-visible,
.field select:focus-visible { outline: 3px solid var(--focus); outline-offset: 1px; }

.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.check {
  display: flex; align-items: center; gap: 10px; min-height: 44px;
  font-size: 13px; color: var(--ink-2); cursor: pointer;
}
.check input { width: 18px; height: 18px; accent-color: var(--accent); flex: 0 0 auto; }

.config__actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 4px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; padding: 0 18px;
  border: 1px solid transparent; border-radius: 5px;
  font-family: inherit; font-size: 13.5px; font-weight: 600; cursor: pointer;
  transition: background-color 160ms var(--ease), color 160ms var(--ease),
              border-color 160ms var(--ease), transform 160ms var(--ease);
}
.btn:active:not(:disabled) { transform: scale(.985); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn--primary { background: var(--accent); color: #ffffff; }
[data-theme="dark"] .btn--primary { color: #10131a; }
.btn--primary:hover:not(:disabled) { filter: brightness(1.08); }
.btn--ghost { background: transparent; color: var(--ink-2); border-color: var(--line-strong); }
.btn--ghost:hover:not(:disabled) { background: var(--surface-2); color: var(--ink); }
.btn--sm { min-height: 38px; padding: 0 13px; font-size: 12.5px; }

.config__note {
  margin: 24px 0 0; padding-top: 20px; border-top: 1px solid var(--line);
  font-size: 12.5px; line-height: 1.8; color: var(--ink-2);
}

/* --------------------------------------------------------------------------
   预览区
   -------------------------------------------------------------------------- */

.preview__head { display: flex; align-items: center; justify-content: space-between; gap: 16px; }

.status-pill {
  display: inline-flex; align-items: center; gap: 8px; min-height: 28px; padding: 0 12px;
  border: 1px solid var(--line-strong); border-radius: 999px;
  font-family: var(--mono); font-size: 11px; font-weight: 600;
  color: var(--ink-2); background: var(--surface-2);
  transition: color 200ms var(--ease), background-color 200ms var(--ease), border-color 200ms var(--ease);
}
.status-pill__dot { width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.status-pill[data-status="ready"] { color: var(--ink-2); }
.status-pill[data-status="loading"],
.status-pill[data-status="signing-in"] { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
.status-pill[data-status="signed-in"] { color: var(--ok); border-color: var(--ok); background: var(--ok-soft); }
.status-pill[data-status="error"] { color: var(--err); border-color: var(--err); background: var(--err-soft); }

.stage {
  display: flex; flex-direction: column; align-items: flex-start; justify-content: center;
  min-height: 230px; margin-top: 20px; padding: 26px 0 30px;
  border-top: 1px solid var(--line);
}
.stage__lead { margin: 0 0 6px; font-size: clamp(19px, 2vw, 24px); font-weight: 620; letter-spacing: -.025em; }
.stage__sub { margin: 0; max-width: 52ch; font-size: 13.5px; color: var(--ink-2); }
.mount { width: 100%; max-width: 400px; margin: 24px 0 14px; min-height: 52px; }
.stage__note { margin: 0; font-size: 12px; color: var(--ink-3); }

.skeleton { width: 100%; max-width: 320px; margin: 20px 0 0; }
.skeleton span {
  display: block; position: relative; overflow: hidden;
  height: 48px; margin-bottom: 8px; border-radius: 4px; background: var(--surface-2);
  border: 1px solid var(--line);
}
.skeleton span:last-child { width: 65%; height: 12px; border: 0; }
.skeleton span::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
  opacity: .35; transform: translateX(-100%);
  animation: shimmer 1.4s var(--ease) infinite;
}
@keyframes shimmer { to { transform: translateX(100%); } }

/* 会话数据：用分隔线与网格，避免通用卡片堆叠 */
.session {
  margin: 4px 0 22px; padding: 22px 0 0;
  border-top: 2px solid var(--ink);
  animation: rise 320ms var(--ease) both;
}
@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

.session__head { display: flex; align-items: center; gap: 14px; margin-bottom: 20px; }
.avatar {
  display: inline-flex; align-items: center; justify-content: center;
  width: 48px; height: 48px; flex: 0 0 auto;
  border-radius: 50%; background: var(--accent-soft); color: var(--accent);
  font-size: 19px; font-weight: 650;
}
.session__who { min-width: 0; flex: 1 1 auto; }
.session__name { margin: 0; font-size: 16px; font-weight: 650; letter-spacing: -.01em; }
.session__email { margin: 2px 0 0; font-size: 13px; color: var(--ink-2); overflow-wrap: anywhere; }
.tag {
  flex: 0 0 auto; padding: 4px 10px; border-radius: 3px;
  font-family: var(--mono); font-size: 10.5px; font-weight: 600;
  color: var(--ok); background: var(--ok-soft); border: 1px solid var(--ok);
}
.tag[data-muted="true"] { color: var(--ink-3); background: var(--surface-2); border-color: var(--line-strong); }

.session__meta {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0; margin: 0 0 18px; border-top: 1px solid var(--line);
}
.session__meta > div { padding: 12px 0; border-bottom: 1px solid var(--line); }
.session__meta > div:nth-child(odd) { padding-right: 16px; }
.session__meta dt { margin: 0 0 3px; font-size: 11px; color: var(--ink-3); }
.session__meta dd { margin: 0; font-family: var(--mono); font-size: 12px; overflow-wrap: anywhere; }

.raw { border-bottom: 1px solid var(--line); padding-bottom: 12px; }
.raw summary { cursor: pointer; font-size: 12.5px; color: var(--accent); font-weight: 600; min-height: 32px; }
.raw summary:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.raw pre {
  margin: 10px 0 0; padding: 14px; max-height: 230px; overflow: auto;
  border: 1px solid var(--line); border-radius: 5px; background: var(--surface-2);
  font-family: var(--mono); font-size: 11.5px; line-height: 1.7; color: var(--ink-2);
}
.session__warn {
  margin: 14px 0 0; padding: 9px 12px; border-left: 3px solid var(--warn);
  background: var(--warn-soft); color: var(--warn); font-size: 12px;
}

.preview__actions { display: flex; flex-wrap: wrap; gap: 8px; padding: 18px 0 26px; border-top: 1px solid var(--line); }

/* 事件日志 */
.logwrap { border-top: 1px solid var(--line); padding-top: 18px; }
.logwrap__head { display: flex; align-items: center; justify-content: space-between; }
.link-btn {
  border: 0; background: transparent; color: var(--accent); cursor: pointer;
  font-family: var(--mono); font-size: 11px; min-height: 32px; padding: 0 4px;
}
.link-btn:hover { text-decoration: underline; }

.log {
  list-style: none; margin: 12px 0 0; padding: 8px 0;
  min-height: 132px; max-height: 210px; overflow-y: auto;
  border: 1px solid var(--line); border-radius: 5px; background: var(--surface-2);
  font-family: var(--mono); font-size: 11.5px; line-height: 1.7;
}
.log__item {
  display: grid; grid-template-columns: 72px 92px minmax(0, 1fr);
  gap: 10px; padding: 4px 14px;
  border-left: 2px solid transparent;
  animation: rise 220ms var(--ease) both;
}
.log__item + .log__item { border-top: 1px solid var(--line); }
.log__time { color: var(--ink-3); }
.log__kind { font-weight: 700; letter-spacing: .04em; color: var(--ink-2); }
.log__msg { color: var(--ink-2); overflow-wrap: anywhere; }
.log__item[data-kind="signin"] { border-left-color: var(--ok); }
.log__item[data-kind="signin"] .log__kind { color: var(--ok); }
.log__item[data-kind="error"] { border-left-color: var(--err); background: var(--err-soft); }
.log__item[data-kind="error"] .log__kind { color: var(--err); }
.log__item[data-kind="buttonclick"] { border-left-color: var(--accent); }
.log__item[data-kind="buttonclick"] .log__kind { color: var(--accent); }
.log__empty { padding: 12px 14px; color: var(--ink-3); }

/* 编号式设计说明：用分隔线建立节奏，不堆叠卡片 */
.notes { margin-top: 36px; border-top: 1px solid var(--line); }
.note {
  display: grid; grid-template-columns: 48px minmax(0, 1fr); gap: 12px;
  padding: 16px 0; border-bottom: 1px solid var(--line);
}
.note__no { font-family: var(--mono); font-size: 11px; color: var(--ink-3); letter-spacing: .1em; padding-top: 3px; }
.note h3 { margin: 0 0 4px; font-size: 13.5px; font-weight: 650; letter-spacing: -.01em; }
.note p { margin: 0; max-width: 62ch; font-size: 12.5px; line-height: 1.7; color: var(--ink-2); }

/* --------------------------------------------------------------------------
   接入代码
   -------------------------------------------------------------------------- */

.snippet {
  max-width: 1440px; margin: 0 auto; padding: clamp(24px, 3vw, 40px);
  border: 1px solid var(--line); border-top: 0; background: var(--surface);
}
.snippet__head { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.snippet__head h2 { margin: 10px 0 0; font-size: 22px; font-weight: 650; letter-spacing: -.03em; }
.snippet__tools { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.tabs { display: inline-flex; border: 1px solid var(--line-strong); border-radius: 5px; overflow: hidden; }
.tab {
  min-height: 38px; padding: 0 14px; border: 0; background: transparent;
  color: var(--ink-2); font-family: var(--mono); font-size: 11.5px; cursor: pointer;
}
.tab + .tab { border-left: 1px solid var(--line-strong); }
.tab.is-active { background: var(--accent-soft); color: var(--accent); font-weight: 700; }

.code {
  margin: 20px 0 0; padding: 20px 22px; overflow-x: auto;
  border: 1px solid var(--line); border-radius: 5px; background: var(--surface-2);
  font-family: var(--mono); font-size: 12.5px; line-height: 1.8; color: var(--ink);
}
.code .tok-c { color: var(--ink-3); }
.code .tok-t { color: var(--accent); }
.code .tok-s { color: var(--ok); }
.code .tok-k { color: var(--err); }
.snippet__note { margin: 14px 0 0; font-size: 12.5px; color: var(--ink-2); }

.footer {
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  max-width: 1440px; margin: 0 auto; padding: 22px clamp(20px, 3vw, 40px) 40px;
  font-size: 11.5px; color: var(--ink-3);
}

.toast {
  position: fixed; right: 24px; bottom: 24px; z-index: 30;
  padding: 11px 16px; border: 1px solid var(--line-strong); border-radius: 5px;
  background: var(--surface); color: var(--ink); box-shadow: 0 8px 28px rgba(0, 0, 0, .12);
  font-size: 13px; animation: rise 220ms var(--ease) both;
}

/* --------------------------------------------------------------------------
   响应式与无障碍
   -------------------------------------------------------------------------- */

@media (max-width: 980px) {
  .shell { grid-template-columns: 1fr; }
  .config { border-right: 0; border-bottom: 1px solid var(--line); }
  .config__intro { margin-bottom: 28px; }
  .lede { max-width: 62ch; }
  .config form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 24px; }
  .config form fieldset:nth-child(1) { grid-row: span 2; }
  .config__actions { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  .topbar { height: 56px; }
  .brand__sub, .brand__divider, .version { display: none; }
  .config form { display: block; }
  .field-row { grid-template-columns: 1fr; gap: 0; }
  .session__meta { grid-template-columns: 1fr; }
  .session__meta > div:nth-child(odd) { padding-right: 0; }
  .tag { display: none; }
  .log__item { grid-template-columns: 62px 80px minmax(0, 1fr); gap: 6px; font-size: 10.5px; }
  .snippet__head { align-items: flex-start; }
  .mount, .ga-btn { max-width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
}