/* ==========================================================================
   访客小站 · 设计系统（PC 优先，纯静态）
   ========================================================================== */

:root {
  /* 色板 */
  --bg: #f4f6fb;
  --bg-soft: #eef2f9;
  --surface: #ffffff;
  --surface-2: #f7f9fc;
  --surface-3: #eef3fa;
  --text: #131722;
  --text-2: #3d4657;
  --muted: #6b7486;
  --border: #e3e8f0;
  --border-strong: #cfd8e6;

  --accent: #2f6bff;
  --accent-strong: #1f51d6;
  --accent-soft: #e8efff;
  --accent-2: #7a5cff;

  --success: #12a150;
  --success-soft: #e5f7ed;
  --warning: #c47f00;
  --warning-soft: #fdf3e0;
  --danger: #d93a45;
  --danger-soft: #fdeaec;

  /* 排版 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  /* 尺寸 */
  --content-width: 1180px;
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 22px;

  --shadow-xs: 0 1px 2px rgba(19, 23, 34, 0.05);
  --shadow-sm: 0 2px 8px rgba(19, 23, 34, 0.06);
  --shadow: 0 10px 30px rgba(19, 23, 34, 0.08);
  --shadow-lg: 0 24px 60px rgba(19, 23, 34, 0.12);

  --header-h: 64px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.01em;
}

p {
  margin: 0;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  color: var(--accent-strong);
}

code {
  font-family: var(--font-mono);
  font-size: 0.86em;
}

::selection {
  background: var(--accent-soft);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 10px 16px;
  border-radius: 0 0 var(--radius) 0;
  z-index: 100;
}
.skip-link:focus {
  left: 0;
  color: #fff;
}

/* --------------------------------------------------------------------------
   布局
   -------------------------------------------------------------------------- */
.shell {
  width: 100%;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.site-header .shell {
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.brand:hover {
  color: var(--text);
}

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 15px;
  font-weight: 800;
  box-shadow: 0 4px 12px rgba(47, 107, 255, 0.35);
}

.brand-sub {
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  padding-left: 10px;
  margin-left: 2px;
  border-left: 1px solid var(--border-strong);
  letter-spacing: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  flex-wrap: wrap;
}

.site-nav a {
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font-size: 14px;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}
.site-nav a:hover {
  background: var(--surface-3);
  color: var(--text);
}
.site-nav a[aria-current="page"] {
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  margin-left: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 12px;
  font-size: 14px;
  cursor: pointer;
  color: var(--text-2);
}

.site-main {
  min-height: 60vh;
  padding: 40px 0 72px;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 28px 0;
  font-size: 13px;
  color: var(--muted);
}
.site-footer .shell {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}
.site-footer a {
  color: var(--text-2);
}
.site-footer a:hover {
  color: var(--accent);
}
.footer-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-left: auto;
}

/* --------------------------------------------------------------------------
   首页 Hero
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-xl);
  background: radial-gradient(
      1100px 420px at 12% -10%,
      rgba(47, 107, 255, 0.16),
      transparent 60%
    ),
    radial-gradient(900px 420px at 92% 0%, rgba(122, 92, 255, 0.16), transparent 55%),
    var(--surface);
  border: 1px solid var(--border);
  padding: 44px 40px 40px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-sm);
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-strong);
  background: var(--accent-soft);
  border: 1px solid rgba(47, 107, 255, 0.18);
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.hero-eyebrow .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 4px rgba(18, 161, 80, 0.16);
}

.hero h1 {
  font-size: 34px;
  letter-spacing: -0.03em;
  max-width: 720px;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-desc {
  margin-top: 14px;
  max-width: 640px;
  color: var(--muted);
  font-size: 15.5px;
}

.hero-actions {
  margin-top: 24px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-stats {
  margin-top: 30px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}
.hero-stat {
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
}
.hero-stat .k {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
}
.hero-stat .v {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  word-break: break-all;
}

/* --------------------------------------------------------------------------
   区块标题
   -------------------------------------------------------------------------- */
.section-head {
  display: flex;
  align-items: flex-end;
  gap: 16px;
  margin: 40px 0 18px;
  flex-wrap: wrap;
}
.section-head:first-child {
  margin-top: 0;
}
.section-head h2 {
  font-size: 21px;
}
.section-head .desc {
  color: var(--muted);
  font-size: 14px;
  margin-top: 4px;
}
.section-head .spacer {
  margin-left: auto;
}

/* --------------------------------------------------------------------------
   卡片 / 网格
   -------------------------------------------------------------------------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-xs);
}
.card + .card {
  margin-top: 20px;
}

.card-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 6px;
}
.card-head h3 {
  font-size: 16px;
}
.card-desc {
  color: var(--muted);
  font-size: 13.5px;
  margin-bottom: 16px;
}

.grid {
  display: grid;
  gap: 16px;
}
.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

/* 工具入口卡片 */
.tool-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  color: inherit;
  transition: transform 0.16s ease, box-shadow 0.16s ease,
    border-color 0.16s ease;
  box-shadow: var(--shadow-xs);
}
.tool-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: var(--border-strong);
  color: inherit;
}
.tool-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-size: 19px;
  background: var(--accent-soft);
  color: var(--accent-strong);
}
.tool-card h3 {
  font-size: 15.5px;
}
.tool-card p {
  color: var(--muted);
  font-size: 13.5px;
}
.tool-tag {
  margin-top: auto;
  font-size: 12px;
  color: var(--muted);
  font-family: var(--font-mono);
}

/* 图标配色变体 */
.tint-1 .tool-icon {
  background: #e8efff;
  color: #1f51d6;
}
.tint-2 .tool-icon {
  background: #f0eaff;
  color: #6a45e6;
}
.tint-3 .tool-icon {
  background: #e5f7ed;
  color: #0f8a45;
}
.tint-4 .tool-icon {
  background: #fdf3e0;
  color: #b07400;
}
.tint-5 .tool-icon {
  background: #fdeaf1;
  color: #c62b62;
}
.tint-6 .tool-icon {
  background: #e4f5f8;
  color: #0b7d92;
}

/* --------------------------------------------------------------------------
   信息表（访客信息）
   -------------------------------------------------------------------------- */
.info-groups {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.info-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xs);
}
.info-card > header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  font-weight: 700;
  font-size: 14px;
}
.info-card > header .badge {
  margin-left: auto;
}
.info-card .info-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.info-row {
  display: flex;
  gap: 14px;
  padding: 10px 18px;
  border-bottom: 1px solid var(--surface-3);
  font-size: 13.5px;
  align-items: flex-start;
}
.info-row:last-child {
  border-bottom: 0;
}
.info-row .k {
  flex: 0 0 132px;
  color: var(--muted);
}
.info-row .v {
  flex: 1;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text);
  word-break: break-word;
  overflow-wrap: anywhere;
}
.info-row .v.plain {
  font-family: var(--font-sans);
}
.info-row .v.is-empty {
  color: var(--muted);
  font-family: var(--font-sans);
}
.info-row.is-wide {
  flex-direction: column;
  gap: 6px;
}
.info-row.is-wide .k {
  flex: none;
}

.mono-block {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--text-2);
  word-break: break-all;
  width: 100%;
}

.swatch-mini {
  display: inline-block;
  width: 46px;
  height: 18px;
  border-radius: 4px;
  border: 1px solid var(--border-strong);
  vertical-align: middle;
  margin-right: 8px;
}

/* --------------------------------------------------------------------------
   按钮
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  font-size: 13.5px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.08s,
    box-shadow 0.15s;
  white-space: nowrap;
}
.btn:hover {
  background: var(--surface-2);
  border-color: var(--border-strong);
}
.btn:active {
  transform: translateY(1px);
}
.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-accent {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 4px 14px rgba(47, 107, 255, 0.28);
}
.btn-accent:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text-2);
}
.btn-ghost:hover {
  background: var(--surface-3);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12.5px;
}

.btn-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

/* --------------------------------------------------------------------------
   表单
   -------------------------------------------------------------------------- */
label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-2);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

input[type="text"],
input[type="number"],
input[type="search"],
input[type="url"],
textarea,
select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 14px;
  transition: border-color 0.15s, box-shadow 0.15s;
}
textarea {
  min-height: 180px;
  resize: vertical;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
}
input:focus,
textarea:focus,
select:focus,
button:focus-visible,
a:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(47, 107, 255, 0.16);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.check-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: var(--text-2);
  font-weight: 500;
}
.check-row input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

.hint {
  font-size: 12.5px;
  color: var(--muted);
}

/* 分段控件 / 标签页 */
.seg-group {
  display: inline-flex;
  padding: 4px;
  gap: 4px;
  background: var(--surface-3);
  border-radius: var(--radius-sm);
  flex-wrap: wrap;
}
.seg-btn {
  border: 0;
  background: transparent;
  padding: 7px 14px;
  border-radius: 5px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-2);
  cursor: pointer;
  font-family: inherit;
}
.seg-btn[aria-pressed="true"],
.seg-btn.is-active {
  background: var(--surface);
  color: var(--accent-strong);
  box-shadow: var(--shadow-xs);
}

/* --------------------------------------------------------------------------
   徽标 / 状态
   -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 600;
  background: var(--surface-3);
  color: var(--text-2);
}
.badge-ok {
  background: var(--success-soft);
  color: var(--success);
}
.badge-warn {
  background: var(--warning-soft);
  color: var(--warning);
}
.badge-bad {
  background: var(--danger-soft);
  color: var(--danger);
}
.badge-info {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

/* --------------------------------------------------------------------------
   结果输出
   -------------------------------------------------------------------------- */
.output {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 460px;
  overflow: auto;
}
.output.is-error {
  color: var(--danger);
  background: var(--danger-soft);
  border-color: rgba(217, 58, 69, 0.25);
}
.output.is-ok {
  color: var(--success);
  background: var(--success-soft);
  border-color: rgba(18, 161, 80, 0.22);
}

.value-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.value-row code {
  flex: 1;
  min-width: 0;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 9px 12px;
  overflow: auto;
  white-space: nowrap;
}

/* 统计块 */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 12px;
}
.stat {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
}
.stat .k {
  font-size: 12px;
  color: var(--muted);
}
.stat .v {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  margin-top: 2px;
}

/* 自营广告位（内容来自 ad-slots.json，由 ad-slots.js 渲染到容器里） */
/* 容器：取不到广告时彻底不占位，避免出现空框 */
.ad-slot:empty {
  display: none;
}

.ad-card {
  display: block;
  position: relative;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  background: var(--surface-2);
  text-align: left;
  color: var(--muted);
  transition: border-color 0.15s, color 0.15s;
}
.ad-card:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.ad-badge {
  position: absolute;
  top: 12px;
  right: 14px;
  font-size: 11px;
  color: var(--muted);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: 1px 8px;
}

.ad-card .ad-eyebrow {
  display: block;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.ad-card .ad-title {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin-top: 4px;
  line-height: 1.4;
}
.ad-card--domain .ad-title {
  font-size: 18px;
  -webkit-line-clamp: 1;
}
.ad-card:hover .ad-title {
  color: var(--accent-strong);
}
.ad-card .ad-desc {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
}

/* 广告图：来自 ad-slots.json 的 image 字段，加载完成才显示，避免破图占位 */
.ad-card .ad-image {
  display: block;
  width: 100%;
  max-height: 140px;
  object-fit: cover;
  border-radius: 10px;
  margin: 8px 0 2px;
  opacity: 0;
  transition: opacity 0.2s;
}

.ad-card .ad-image[data-loaded="1"] { opacity: 1; }
.ad-card .ad-cta {
  display: block;
  margin-top: 8px;
  font-size: 13px;
}

.ad-inline {
  margin: 22px 0;
}

/* --------------------------------------------------------------------------
   Toast
   -------------------------------------------------------------------------- */
.toast-wrap {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-end;
  pointer-events: none;
}
.toast {
  background: #131722;
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--radius);
  font-size: 13.5px;
  box-shadow: var(--shadow-lg);
  animation: toast-in 0.2s ease;
  max-width: 320px;
}
.toast.is-ok {
  background: #0f8a45;
}
.toast.is-err {
  background: #c62b36;
}
@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --------------------------------------------------------------------------
   内容页排版
   -------------------------------------------------------------------------- */
.prose {
  max-width: 760px;
}
.prose h2 {
  font-size: 19px;
  margin: 28px 0 10px;
}
.prose p,
.prose li {
  color: var(--text-2);
  font-size: 14.5px;
}
.prose ul {
  padding-left: 20px;
}
.prose li {
  margin: 6px 0;
}

.crumbs {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 14px;
}
.crumbs a {
  color: var(--muted);
}
.crumbs a:hover {
  color: var(--accent);
}

.page-title {
  font-size: 26px;
  letter-spacing: -0.02em;
}
.page-lede {
  color: var(--muted);
  margin-top: 8px;
  max-width: 720px;
}

.tool-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.notice {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  background: var(--accent-soft);
  border: 1px solid rgba(47, 107, 255, 0.18);
  color: var(--accent-strong);
  border-radius: var(--radius);
  padding: 12px 14px;
  font-size: 13px;
}

/* --------------------------------------------------------------------------
   响应式（PC 优先，向下兼容）
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .grid-4 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .info-groups {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 820px) {
  .hero {
    padding: 32px 22px;
  }
  .hero h1 {
    font-size: 27px;
  }
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .nav-toggle {
    display: inline-block;
  }
  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 10px 16px;
    display: none;
    box-shadow: var(--shadow);
  }
  .site-nav.is-open {
    display: flex;
  }
}

@media (max-width: 560px) {
  .shell {
    padding: 0 16px;
  }
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: minmax(0, 1fr);
  }
  .form-grid {
    grid-template-columns: minmax(0, 1fr);
  }
  .info-row {
    flex-direction: column;
    gap: 4px;
  }
  .info-row .k {
    flex: none;
  }
}