/* ============================================================
   Do I Need Visa — 全站共享样式
   设计原则:移动优先 / 系统字体(无外部字体,保 LCP)/ 无框架依赖
   四态配色遵循 DEV §4.2:
     visa_free  → green-600  (#16a34a)
     on_arrival → amber-500  (#f59e0b)
     evisa      → blue-600   (#2563eb)
     required   → red-600    (#dc2626)
   ============================================================ */

:root {
  --c-bg: #f8fafc;
  --c-surface: #ffffff;
  --c-border: #e2e8f0;
  --c-text: #0f172a;
  --c-text-2: #475569;
  --c-text-3: #94a3b8;
  --c-primary: #1d4ed8;
  --c-primary-hover: #1e40af;
  --c-free: #16a34a;
  --c-free-bg: #f0fdf4;
  --c-arrival: #d97706;
  --c-arrival-bg: #fffbeb;
  --c-evisa: #2563eb;
  --c-evisa-bg: #eff6ff;
  --c-required: #dc2626;
  --c-required-bg: #fef2f2;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(15, 23, 42, .08), 0 4px 12px rgba(15, 23, 42, .06);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.65;
  font-size: 16px;
}

img { max-width: 100%; }
a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- 布局 ---------- */
.container { max-width: 960px; margin: 0 auto; padding: 0 16px; }
.section { padding: 40px 0; }
.section-sm { padding: 28px 0; }

/* ---------- 头部 / 底部 ---------- */
.site-header {
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  position: sticky; top: 0; z-index: 50;
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 56px;
}
.brand { font-weight: 700; font-size: 17px; color: var(--c-text); }
.brand:hover { text-decoration: none; }
.brand span { color: var(--c-primary); }
.site-nav { display: flex; gap: 18px; font-size: 14px; }
.site-nav a { color: var(--c-text-2); }
.site-nav a:hover { color: var(--c-primary); text-decoration: none; }

.site-footer {
  background: #0f172a; color: #cbd5e1;
  margin-top: 48px; padding: 40px 0 24px; font-size: 14px;
}
.site-footer a { color: #93c5fd; }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
.footer-col h3 { color: #f1f5f9; font-size: 14px; margin-bottom: 10px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 6px; }
.footer-legal {
  border-top: 1px solid #1e293b; margin-top: 28px; padding-top: 16px;
  color: #64748b; font-size: 13px; line-height: 1.7;
}
@media (min-width: 720px) {
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}

/* ---------- 首屏工具区(红线 #7:首屏即工具) ---------- */
.hero {
  background: linear-gradient(180deg, #eff6ff 0%, var(--c-bg) 100%);
  padding: 24px 0 32px;
}
.hero h1 {
  font-size: 26px; line-height: 1.3; text-align: center;
  margin-bottom: 16px; letter-spacing: -0.01em;
}
@media (min-width: 720px) { .hero h1 { font-size: 34px; } }

/* ---------- 查询器 ---------- */
.checker {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  max-width: 640px;
  margin: 0 auto;
}
.checker-row { display: flex; flex-direction: column; gap: 12px; }
@media (min-width: 640px) {
  .checker-row { flex-direction: row; align-items: flex-end; }
  .checker-field { flex: 1; }
}
.checker-field label {
  display: block; font-size: 13px; font-weight: 600;
  color: var(--c-text-2); margin-bottom: 6px;
}
.combo { position: relative; }
.combo input {
  width: 100%; height: 48px; padding: 0 14px;
  font-size: 16px; border: 1.5px solid var(--c-border);
  border-radius: 10px; background: #fff; color: var(--c-text);
}
.combo input:focus {
  outline: none; border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(29, 78, 216, .15);
}
.combo-list {
  position: absolute; top: calc(100% + 4px); left: 0; right: 0;
  background: #fff; border: 1px solid var(--c-border);
  border-radius: 10px; box-shadow: var(--shadow);
  max-height: 280px; overflow-y: auto; z-index: 60;
  display: none; list-style: none;
}
.combo.open .combo-list { display: block; }
.combo-list li {
  padding: 10px 14px; font-size: 15px; cursor: pointer;
  display: flex; align-items: center; gap: 8px;
}
.combo-list li:hover, .combo-list li.active { background: #eff6ff; }
.combo-list .flag { font-size: 18px; }
.combo-arrow {
  display: none;
}
@media (min-width: 640px) {
  .combo-arrow {
    display: flex; align-items: center; justify-content: center;
    padding: 0 4px 12px; color: var(--c-text-3); font-size: 20px;
  }
}

/* ---------- 移动端全屏搜索面板(TODO[3], PRD 非功能需求) ---------- */
.combo-backdrop { display: none; }
@media (max-width: 639px) {
  body.combo-modal-open { overflow: hidden; }
  body.combo-modal-open .combo-backdrop {
    display: block; position: fixed; inset: 0;
    background: rgba(15, 23, 42, .45); z-index: 90;
  }
  .combo.open {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: #fff; padding: 12px 16px;
    box-shadow: 0 1px 0 rgba(0, 0, 0, .08);
  }
  .combo.open .combo-list {
    position: fixed; top: 68px; left: 0; right: 0; bottom: 0;
    max-height: none; border: none; border-radius: 0; box-shadow: none;
  }
  .combo.open .combo-list li { padding: 14px 16px; font-size: 16px; }
}

/* ---------- 结果卡片(预留 min-height 防 CLS) ---------- */
.result-area { min-height: 0; margin-top: 16px; }
.result-card {
  border-radius: 10px; padding: 16px 18px;
  border: 1.5px solid transparent; display: none;
}
.result-card.show { display: block; }
.result-card .result-headline {
  font-size: 19px; font-weight: 700; line-height: 1.4;
}
.result-card .result-detail { font-size: 14px; margin-top: 6px; color: var(--c-text-2); }
.result-card .result-links { margin-top: 12px; font-size: 14px; display: flex; flex-wrap: wrap; gap: 8px 18px; }
.result-card.free     { background: var(--c-free-bg);     border-color: var(--c-free); }
.result-card.free .result-headline     { color: var(--c-free); }
.result-card.arrival  { background: var(--c-arrival-bg);  border-color: var(--c-arrival); }
.result-card.arrival .result-headline  { color: var(--c-arrival); }
.result-card.evisa    { background: var(--c-evisa-bg);    border-color: var(--c-evisa); }
.result-card.evisa .result-headline    { color: var(--c-evisa); }
.result-card.required { background: var(--c-required-bg); border-color: var(--c-required); }
.result-card.required .result-headline { color: var(--c-required); }
.result-card.unknown  { background: #f1f5f9; border-color: var(--c-text-3); }
.result-card.unknown .result-headline  { color: var(--c-text-2); }

.share-row { margin-top: 10px; text-align: center; font-size: 13px; color: var(--c-text-3); }
.share-row button {
  background: none; border: none; color: var(--c-primary);
  cursor: pointer; font-size: 13px; text-decoration: underline;
}

/* ---------- 通用排版 ---------- */
h1.page-title { font-size: 28px; line-height: 1.3; margin-bottom: 12px; }
h2 { font-size: 22px; margin: 32px 0 12px; }
h3 { font-size: 17px; margin: 20px 0 8px; }
p { margin-bottom: 12px; color: var(--c-text-2); }
.lead { font-size: 17px; color: var(--c-text-2); }
.prose ul, .prose ol { margin: 0 0 12px 22px; color: var(--c-text-2); }
.prose li { margin-bottom: 6px; }

/* ---------- 卡片 / 列表 ---------- */
.card {
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow);
}
.grid-3 { display: grid; grid-template-columns: 1fr; gap: 14px; }
@media (min-width: 720px) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }
.grid-4 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (min-width: 720px) { .grid-4 { grid-template-columns: repeat(4, 1fr); } }

.step-card { text-align: left; }
.step-card .step-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--c-primary); color: #fff; font-weight: 700;
  margin-bottom: 10px;
}

.badge {
  display: inline-block; padding: 2px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 600;
}
.badge.free     { background: var(--c-free-bg);     color: var(--c-free); }
.badge.arrival  { background: var(--c-arrival-bg);  color: var(--c-arrival); }
.badge.evisa    { background: var(--c-evisa-bg);    color: var(--c-evisa); }
.badge.required { background: var(--c-required-bg); color: var(--c-required); }
.badge.unknown  { background: #f1f5f9; color: var(--c-text-2); }

/* ---------- 国家条目列表 ---------- */
.country-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px; list-style: none;
}
@media (min-width: 720px) { .country-grid { grid-template-columns: repeat(4, 1fr); } }
.country-grid a {
  display: flex; align-items: center; gap: 8px;
  padding: 9px 12px; background: var(--c-surface);
  border: 1px solid var(--c-border); border-radius: 8px;
  color: var(--c-text); font-size: 14px;
}
.country-grid a:hover { border-color: var(--c-primary); text-decoration: none; }
.country-grid .flag { font-size: 18px; }
.country-grid .days { margin-left: auto; font-size: 12px; color: var(--c-text-3); }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; margin: 12px 0; }
table.data {
  width: 100%; border-collapse: collapse; font-size: 14px;
  background: var(--c-surface);
}
table.data th, table.data td {
  padding: 10px 12px; border: 1px solid var(--c-border); text-align: left;
}
table.data th { background: #f1f5f9; font-weight: 600; }

/* ---------- FAQ ---------- */
.faq-item {
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: 10px; padding: 16px 18px; margin-bottom: 10px;
}
.faq-item h3 { margin: 0 0 8px; font-size: 16px; }
.faq-item p { margin-bottom: 0; font-size: 14px; }

/* ---------- 面包屑 ---------- */
.breadcrumb { font-size: 13px; color: var(--c-text-3); margin-bottom: 14px; }
.breadcrumb a { color: var(--c-text-2); }

/* ---------- 提示条 ---------- */
.notice {
  background: #fffbeb; border: 1px solid #fde68a; border-radius: 10px;
  padding: 12px 16px; font-size: 13px; color: #92400e; margin: 16px 0;
}
.updated-at { font-size: 13px; color: var(--c-text-3); }

/* ---------- CTA ---------- */
.cta-band {
  background: var(--c-primary); color: #fff; border-radius: var(--radius);
  padding: 28px 24px; text-align: center; margin: 32px 0;
}
.cta-band h2 { color: #fff; margin: 0 0 8px; }
.cta-band p { color: #bfdbfe; }
.cta-band a.btn-light {
  display: inline-block; background: #fff; color: var(--c-primary);
  font-weight: 700; padding: 12px 28px; border-radius: 10px; margin-top: 8px;
}
.cta-band a.btn-light:hover { text-decoration: none; background: #eff6ff; }

/* ---------- 无障碍 ---------- */
:focus-visible { outline: 2px solid var(--c-primary); outline-offset: 2px; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}
.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--c-primary); color: #fff; padding: 8px 16px; z-index: 100;
}
.skip-link:focus { left: 0; }

/* ==================== v2 增强（路线页/排名页/首页区块/列表页控件） ==================== */

/* 首页:热门路线 */
.route-list { list-style: none; padding: 0; margin: 16px 0 0; display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.route-chip { display: flex; justify-content: space-between; align-items: center; gap: 10px; background: var(--c-surface); border: 1px solid var(--c-border); border-radius: 10px; padding: 12px 14px; }
.route-chip:hover { text-decoration: none; border-color: var(--c-primary); box-shadow: 0 1px 6px rgba(29,78,216,.10); }
.rc-pair { font-weight: 600; color: var(--c-text); }
.rc-badge { font-size: 12.5px; font-weight: 700; white-space: nowrap; padding: 4px 10px; border-radius: 999px; }
.route-chip.free .rc-badge { color: var(--c-free); background: var(--c-free-bg); }
.route-chip.arrival .rc-badge { color: var(--c-arrival); background: var(--c-arrival-bg); }
.route-chip.evisa .rc-badge { color: var(--c-evisa); background: var(--c-evisa-bg); }
.route-chip.required .rc-badge { color: var(--c-required); background: var(--c-required-bg); }

/* 首页:统计带 */
.stats-band { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 16px; }
.stat { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: 12px; padding: 20px 12px; text-align: center; }
.stat-big { display: block; font-size: 28px; font-weight: 800; color: var(--c-primary); }
.stat-label { display: block; margin-top: 4px; font-size: 13px; color: #64748b; }
@media (max-width: 560px) { .stats-band { grid-template-columns: 1fr; } }

/* Quick Facts */
.fact-grid { display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); margin-top: 14px; }
.fact { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: 10px; padding: 12px 14px; }
.fact-k { display: block; font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: #64748b; }
.fact-v { display: block; margin-top: 3px; font-weight: 600; color: var(--c-text); }

/* 路线页:护照对比 */
.cmp-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 14px 0; }
.cmp-card { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: 12px; padding: 18px; text-align: center; }
.cmp-name { font-weight: 700; }
.cmp-big { font-size: 34px; font-weight: 800; color: var(--c-primary); margin-top: 6px; }
.cmp-sub { font-size: 13px; color: #64748b; }
.cmp-meta { margin-top: 8px; font-size: 13.5px; color: #475569; }
@media (max-width: 560px) { .cmp-grid { grid-template-columns: 1fr; } }

/* 路线页:答案卡静态版与操作行 */
.result-card.static { display: block; margin-top: 14px; }
.route-actions { margin: 14px 0 0; display: flex; flex-wrap: wrap; gap: 10px; }
.btn-ghost { display: inline-block; border: 1px solid var(--c-border); background: var(--c-surface); color: var(--c-primary); font-weight: 600; font-size: 14px; padding: 9px 14px; border-radius: 9px; }
.btn-ghost:hover { text-decoration: none; border-color: var(--c-primary); }

/* 材料清单 */
.doc-list { margin: 12px 0; padding: 0 0 0 2px; list-style: none; }
.doc-list li { padding: 9px 0 9px 30px; position: relative; border-bottom: 1px dashed var(--c-border); }
.doc-list li:last-child { border-bottom: 0; }
.doc-list li::before { content: "✓"; position: absolute; left: 4px; color: var(--c-free); font-weight: 800; }

/* 免签列表页控件 */
.vf-controls { margin-top: 14px; }
.vf-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { border: 1px solid var(--c-border); background: var(--c-surface); color: #475569; font-size: 13.5px; font-weight: 600; padding: 7px 14px; border-radius: 999px; cursor: pointer; }
.chip:hover { border-color: var(--c-primary); color: var(--c-primary); }
.chip.active { background: var(--c-primary); border-color: var(--c-primary); color: #fff; }
.vf-tools { display: flex; gap: 10px; margin-top: 10px; flex-wrap: wrap; }
.vf-search { flex: 1; min-width: 200px; border: 1px solid var(--c-border); border-radius: 9px; padding: 10px 12px; font-size: 15px; background: var(--c-surface); }
.vf-sort { border: 1px solid var(--c-border); border-radius: 9px; padding: 10px 12px; font-size: 14px; background: var(--c-surface); color: var(--c-text); }
.count-badge { display: inline-block; margin-left: 10px; vertical-align: middle; background: var(--c-evisa-bg); color: var(--c-evisa); font-size: 13px; font-weight: 700; padding: 2px 10px; border-radius: 999px; }

/* 排名页 */
.top10 li a { align-items: center; }
.rank-table th { user-select: none; white-space: nowrap; }
.rank-table th.sorted-asc::after { content: " ↑"; color: var(--c-primary); }
.rank-table th.sorted-desc::after { content: " ↓"; color: var(--c-primary); }

/* IP 归属地快捷选择 chip */
.geo-chip {
  display: inline-flex; align-items: center; gap: 6px; margin-top: 8px;
  border: 1px dashed var(--c-border); background: var(--c-evisa-bg); color: var(--c-text);
  font-size: 13px; font-weight: 600; padding: 6px 12px; border-radius: 999px; cursor: pointer;
}
.geo-chip:hover { border-color: var(--c-primary); color: var(--c-primary); }
.geo-chip-hint { color: #64748b; font-weight: 500; }
/* ---------- 优化:移动端导航换行 + 横向滚动(4 链接在窄屏溢出) ---------- */
@media (max-width: 719px) {
  .site-header .container { flex-wrap: wrap; height: auto; padding: 8px 0; row-gap: 4px; }
  .site-nav { width: 100%; overflow-x: auto; white-space: nowrap; font-size: 13px; gap: 14px; -webkit-overflow-scrolling: touch; }
}

/* 下拉匹配片段高亮 */
.combo-list mark { background: #fef08a; color: inherit; border-radius: 2px; padding: 0 1px; }

/* 返回顶部按钮(app.js initBackToTop 注入) */
.back-to-top {
  position: fixed; right: 20px; bottom: 20px; z-index: 70;
  width: 44px; height: 44px; border-radius: 50%; border: none; cursor: pointer;
  background: var(--c-primary); color: #fff; font-size: 20px; line-height: 1;
  box-shadow: 0 4px 14px rgba(15, 23, 42, .25);
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: opacity .2s ease, transform .2s ease, visibility .2s;
}
.back-to-top:hover { background: var(--c-primary-hover); }
.back-to-top.show { opacity: 1; visibility: visible; transform: none; }
@media (prefers-reduced-motion: reduce) { .back-to-top { transition: none; } }