/* ============================================================
   添先生海外GEO · AI 信源网站 —— 响应式样式
   Copyright (c) 添先生 | 官网 tianguangai.com | 微信 13570149131
   自适应：手机 / 平板 / 桌面
   ============================================================ */

:root {
  --c-primary: #1f4e79;
  --c-primary-2: #2e5c8a;
  --c-accent: #0d7a5f;
  --c-text: #1f2933;
  --c-muted: #6b7280;
  --c-bg: #ffffff;
  --c-bg-soft: #f5f8fc;
  --c-border: #e3e8ef;
  --radius: 10px;
  --shadow: 0 2px 10px rgba(31, 78, 121, .08);
  --shadow-lg: 0 8px 30px rgba(31, 78, 121, .12);
  --maxw: 1140px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--c-primary); text-decoration: none; }
a:hover { color: var(--c-primary-2); text-decoration: underline; }

/* ---------------- 容器 ---------------- */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------------- 顶部导航（移动端自适应折叠）---------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: #fff; border-bottom: 1px solid var(--c-border);
  backdrop-filter: saturate(180%) blur(8px);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; color: var(--c-primary); }
.brand .dot {
  width: 26px; height: 26px; border-radius: 8px; flex: none;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
}
.nav-links { display: flex; align-items: center; gap: 22px; list-style: none; margin: 0; padding: 0; }
.nav-links a { font-size: 15px; color: var(--c-text); }
.nav-links a:hover { color: var(--c-primary); }
.nav-toggle {
  display: none; border: 1px solid var(--c-border); background: #fff;
  border-radius: 8px; padding: 8px 12px; font-size: 18px; cursor: pointer;
}

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 20px; border-radius: 8px; border: 1px solid transparent;
  font-size: 15px; font-weight: 600; cursor: pointer; transition: .18s;
  text-decoration: none !important; line-height: 1.4;
}
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover { background: var(--c-primary-2); color: #fff; }
.btn-ghost { background: #fff; color: var(--c-primary); border-color: var(--c-border); }
.btn-ghost:hover { border-color: var(--c-primary); }
.btn-danger { background: #b42318; color: #fff; }
.btn-block { width: 100%; }
.btn-sm { padding: 6px 12px; font-size: 13px; }

/* ---------------- 首页 Hero ---------------- */
.hero {
  padding: 72px 0 56px;
  background: linear-gradient(180deg, var(--c-bg-soft), #fff);
  border-bottom: 1px solid var(--c-border);
}
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.hero h1 { font-size: clamp(28px, 4vw, 44px); line-height: 1.25; margin: 0 0 16px; color: var(--c-primary); }
.hero p.lead { font-size: clamp(15px, 1.6vw, 18px); color: var(--c-muted); margin: 0 0 28px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-card {
  background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow-lg);
}
.hero-card h3 { margin: 0 0 14px; font-size: 17px; color: var(--c-primary); }
.hero-card ol { margin: 0; padding-left: 20px; color: var(--c-muted); font-size: 14.5px; }
.hero-card li { margin-bottom: 8px; }

/* ---------------- 区块 ---------------- */
.section { padding: 56px 0; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 28px; flex-wrap: wrap; }
.section-head h2 { font-size: clamp(22px, 2.6vw, 30px); margin: 0; color: var(--c-text); }
.section-head .more { font-size: 14px; }

/* ---------------- 卡片网格（自适应）---------------- */
.grid { display: grid; gap: 22px; grid-template-columns: repeat(3, 1fr); }
.card {
  background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow); transition: .2s; display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.card h3 { margin: 0 0 10px; font-size: 17px; line-height: 1.45; }
.card h3 a { color: var(--c-text); }
.card h3 a:hover { color: var(--c-primary); text-decoration: none; }
.card .meta { font-size: 12.5px; color: var(--c-muted); margin-bottom: 10px; display: flex; flex-wrap: wrap; gap: 10px; }
.card .excerpt { font-size: 14.5px; color: var(--c-muted); margin: 0; flex: 1; }

/* ---------------- 文章详情 ---------------- */
.article { padding: 40px 0 64px; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 44px; align-items: start; }
.article-body { min-width: 0; }
.article-body h1 { font-size: clamp(26px, 3.4vw, 38px); line-height: 1.25; margin: 0 0 14px; color: var(--c-text); }
.article-meta { font-size: 13.5px; color: var(--c-muted); margin-bottom: 26px; display: flex; flex-wrap: wrap; gap: 12px; }
.article-body h2 { font-size: clamp(20px, 2.4vw, 26px); margin: 40px 0 14px; color: var(--c-primary); line-height: 1.35; }
.article-body h3 { font-size: 18px; margin: 28px 0 10px; }
.article-body p { margin: 0 0 16px; }
.article-body blockquote {
  margin: 22px 0; padding: 16px 20px; background: var(--c-bg-soft);
  border-left: 4px solid var(--c-primary); border-radius: 0 8px 8px 0; color: #37474f;
}
.article-body ul, .article-body ol { padding-left: 22px; margin: 0 0 18px; }
.article-body li { margin-bottom: 7px; }
.article-body code { background: #eef2f7; padding: 2px 6px; border-radius: 4px; font-size: 13.5px; }
.article-body table { width: 100%; border-collapse: collapse; margin: 22px 0; font-size: 14.5px; }
.article-body th, .article-body td { border: 1px solid var(--c-border); padding: 10px 12px; text-align: left; }
.article-body th { background: var(--c-bg-soft); font-weight: 600; }
.article-body hr { border: none; border-top: 1px solid var(--c-border); margin: 34px 0; }

.aside { position: sticky; top: 84px; }
.aside-box { background: var(--c-bg-soft); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 20px; margin-bottom: 18px; }
.aside-box h4 { margin: 0 0 12px; font-size: 15px; color: var(--c-primary); }
.aside-box ul { list-style: none; margin: 0; padding: 0; font-size: 14px; }
.aside-box li { margin-bottom: 9px; }

/* ---------------- 表单 ---------------- */
.form-card { max-width: 460px; margin: 48px auto; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 7px; }
.form-control {
  width: 100%; padding: 11px 14px; border: 1px solid var(--c-border);
  border-radius: 8px; font-size: 15px; font-family: inherit; background: #fff;
}
.form-control:focus { outline: none; border-color: var(--c-primary); box-shadow: 0 0 0 3px rgba(31,78,121,.10); }
.form-hint { font-size: 12.5px; color: var(--c-muted); margin-top: 6px; }

.alert { padding: 12px 16px; border-radius: 8px; font-size: 14.5px; margin-bottom: 18px; }
.alert-error { background: #fef3f2; color: #b42318; border: 1px solid #fecdca; }
.alert-ok { background: #ecfdf3; color: #067647; border: 1px solid #abefc6; }
.alert-info { background: #eff8ff; color: #175cd3; border: 1px solid #b2ddff; }

/* ---------------- 表格（移动端横向滚动）---------------- */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table.data { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 560px; }
table.data th, table.data td { padding: 11px 12px; border-bottom: 1px solid var(--c-border); text-align: left; }
table.data th { background: var(--c-bg-soft); font-weight: 600; white-space: nowrap; }
table.data tr:hover td { background: #fafcff; }

/* ---------------- 统计卡 ---------------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-bottom: 32px; }
.stat { background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius); padding: 20px; }
.stat .num { font-size: 26px; font-weight: 700; color: var(--c-primary); line-height: 1.2; }
.stat .lbl { font-size: 13px; color: var(--c-muted); margin-top: 4px; }

/* ---------------- 提示条 / 页脚 ---------------- */
.notice {
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  color: #fff; text-align: center; font-size: 13.5px; padding: 9px 16px;
}
.site-footer {
  border-top: 1px solid var(--c-border); background: var(--c-bg-soft);
  padding: 34px 0; margin-top: 60px; font-size: 14px; color: var(--c-muted);
}
.footer-grid { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer-grid a { color: var(--c-primary); }

.pill {
  display: inline-block; padding: 2px 9px; border-radius: 999px;
  font-size: 11.5px; font-weight: 600; background: var(--c-bg-soft); color: var(--c-primary);
}
.pill-ok { background: #ecfdf3; color: #067647; }
.pill-warn { background: #fffaeb; color: #b54708; }
.pill-wait { background: #eff8ff; color: #175cd3; }

.empty { text-align: center; padding: 56px 20px; color: var(--c-muted); }

/* ============================================================
   响应式断点（自适应核心）
   ============================================================ */

/* 平板 */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero { padding: 52px 0 44px; }
  .article-layout { grid-template-columns: 1fr; gap: 32px; }
  .aside { position: static; }
  .grid { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
}

/* 手机 */
@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .wrap { padding: 0 16px; }

  .nav-links {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; border-bottom: 1px solid var(--c-border);
    box-shadow: var(--shadow-lg); padding: 8px 0;
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: 13px 20px; border-bottom: 1px solid #f1f4f8; }
  .nav-links a:last-child { border-bottom: none; }
  .nav-toggle { display: inline-block; }

  .hero { padding: 38px 0 32px; }
  .hero-actions .btn { flex: 1 1 100%; }
  .section { padding: 38px 0; }

  .grid { grid-template-columns: 1fr; gap: 16px; }
  .stats { grid-template-columns: 1fr 1fr; gap: 12px; }
  .stat { padding: 16px; }
  .stat .num { font-size: 22px; }

  .article { padding: 26px 0 44px; }
  .form-card { margin: 24px auto; }

  .footer-grid { flex-direction: column; gap: 14px; }

  .table-wrap { margin: 0 -16px; padding: 0 16px; }
}

/* 大屏优化 */
@media (min-width: 1400px) {
  :root { --maxw: 1240px; }
}

/* ============================================================
   用户中心 · 资源下载卡片
   ============================================================ */
.dl-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.dl-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 22px;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 14px;
  text-decoration: none;
  color: inherit;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.dl-card:hover {
  transform: translateY(-2px);
  border-color: #1a73e8;
  box-shadow: 0 8px 24px rgba(26, 115, 232, .12);
}

.dl-icon {
  flex: 0 0 52px;
  width: 52px; height: 52px;
  display: flex; align-items: center; justify-content: center;
  font-size: 26px;
  background: linear-gradient(135deg, #eef4ff, #e3edff);
  border-radius: 12px;
}

.dl-body { flex: 1 1 auto; min-width: 0; }

.dl-title {
  font-size: 16.5px;
  font-weight: 700;
  margin-bottom: 5px;
  color: #111827;
}

.dl-desc {
  font-size: 13px;
  line-height: 1.65;
  color: #6b7280;
}

.dl-meta {
  margin-top: 7px;
  font-size: 12px;
  color: #9ca3af;
}

.dl-action {
  flex: 0 0 auto;
  padding: 9px 20px;
  background: #1a73e8;
  color: #fff;
  border-radius: 9px;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
}
.dl-card:hover .dl-action { background: #1557b0; }

@media (max-width: 720px) {
  .dl-grid { grid-template-columns: 1fr; gap: 14px; }
  .dl-card { padding: 16px; gap: 12px; }
  .dl-icon { flex-basis: 44px; width: 44px; height: 44px; font-size: 22px; }
  .dl-action { padding: 8px 14px; font-size: 13px; }
}

/* ============================================================
   用户中心 · 文章一键复制
   ============================================================ */
.copy-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
}
.copy-meta-item {
  font-size: 13px;
  color: #6b7280;
  text-decoration: none;
}
a.copy-meta-item { color: #1a73e8; }
a.copy-meta-item:hover { text-decoration: underline; }

.copy-quick { margin-bottom: 30px; }

.copy-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.copy-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  text-align: left;
  cursor: pointer;
  font: inherit;
  transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease;
}
.copy-card:hover {
  transform: translateY(-2px);
  border-color: #1a73e8;
  box-shadow: 0 8px 22px rgba(26, 115, 232, .12);
}
.copy-card-icon {
  flex: 0 0 44px;
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px;
  background: linear-gradient(135deg, #eef4ff, #e3edff);
  border-radius: 10px;
}
.copy-card-body { flex: 1 1 auto; min-width: 0; }
.copy-card-title { font-size: 15.5px; font-weight: 700; color: #111827; margin-bottom: 4px; }
.copy-card-desc { font-size: 12.5px; line-height: 1.6; color: #6b7280; }
.copy-card-action {
  flex: 0 0 auto;
  padding: 7px 16px;
  background: #1a73e8;
  color: #fff;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}
.copy-card:hover .copy-card-action { background: #1557b0; }
.copy-card.is-copied .copy-card-action { background: #067647; }
.copy-card.is-failed .copy-card-action { background: #b42318; }

.copy-block {
  margin-bottom: 28px;
  padding: 18px 20px;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
}
.copy-block-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.copy-block-head h3 { margin: 0; font-size: 16px; }
.copy-block-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.copy-hint {
  margin: 0 0 12px;
  font-size: 13px;
  line-height: 1.7;
  color: #6b7280;
}

.copy-preview {
  padding: 14px 16px;
  background: #f9fafb;
  border: 1px solid #eef0f4;
  border-radius: 9px;
  font-size: 14.5px;
  line-height: 1.75;
  color: #1f2937;
  max-height: 340px;
  overflow: auto;
}
.copy-preview-title { font-size: 17px; font-weight: 700; }
.copy-preview-rich > h1 { font-size: 20px; margin: 0 0 12px; }
.copy-preview-rich > h2 { font-size: 17px; margin: 20px 0 10px; }
.copy-preview-rich > h3 { font-size: 15.5px; margin: 16px 0 8px; }
.copy-preview-rich img { max-width: 100%; height: auto; border-radius: 8px; }

.copy-src {
  width: 100%;
  margin-top: 12px;
  padding: 13px 15px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12.5px;
  line-height: 1.65;
  color: #374151;
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  border-radius: 9px;
  resize: vertical;
  box-sizing: border-box;
}

.btn.is-copied { background: #067647; border-color: #067647; color: #fff; }
.btn.is-failed { background: #b42318; border-color: #b42318; color: #fff; }

@media (max-width: 720px) {
  .copy-grid { grid-template-columns: 1fr; }
  .copy-card { padding: 14px; gap: 12px; }
  .copy-card-icon { flex-basis: 38px; width: 38px; height: 38px; font-size: 19px; }
  .copy-card-desc { display: none; }
  .copy-block { padding: 15px 14px; }
}