/* ============================================================
   EduTourChina — guide.edutourchina.net
   Academic indigo + teal + warm gold. Self-contained for Phase 1.
   Phase 2 appends references/css_base.css (RTL / Arabic webfont /
   .mt-disclaimer) on top of this file.
   ============================================================ */
:root {
  --primary: #3D2F8F;
  --primary-light: #5B4BC9;
  --primary-dark: #2A1F63;
  --accent: #0E8C96;
  --accent-light: #36B0B8;
  --gold: #C9A24B;
  --gold-light: #E7CF94;
  --ink: #1C2138;
  --muted: #5B6275;
  --bg: #FFFFFF;
  --bg-alt: #F4F5FB;
  --border: #E5E7F0;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 6px 24px rgba(40, 35, 90, .08);
  --shadow-lg: 0 14px 44px rgba(40, 35, 90, .14);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans",
    "PingFang SC", "Microsoft YaHei", sans-serif;
  --maxw: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-light); }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------- Nav (unique structure) ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 14px 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.nav-brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 19px; color: var(--primary); }
.nav-brand .logo-mark {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 16px;
}
.nav-brand span.tour, .nav-brand span.china { color: var(--accent); }
.nav-links { display: flex; align-items: center; gap: 22px; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--ink); font-weight: 600; font-size: 15px; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-cta { margin-left: 8px; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--ink); margin: 5px 0; transition: .3s; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; border-radius: 999px; font-weight: 700; font-size: 15px;
  border: 2px solid transparent; cursor: pointer; transition: .2s; white-space: nowrap;
}
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { color: #fff; transform: translateY(-1px); box-shadow: var(--shadow-lg); }
.btn-accent { background: linear-gradient(135deg, var(--accent), var(--accent-light)); color: #fff; }
.btn-accent:hover { color: #fff; transform: translateY(-1px); }
.btn-ghost { background: #fff; border-color: var(--primary); color: var(--primary); }
.btn-ghost:hover { background: var(--primary); color: #fff; }
.btn-gold { background: var(--gold); color: #fff; }
.btn-gold:hover { color: #fff; background: var(--gold-light); }
.btn-group { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- Hero ---------- */
.hero {
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(14, 140, 150, .18), transparent),
    radial-gradient(900px 500px at 10% 10%, rgba(61, 47, 143, .16), transparent),
    linear-gradient(180deg, #f7f6fd, #ffffff);
  padding: 72px 0 60px;
}
.hero h1 { font-size: clamp(30px, 5vw, 50px); line-height: 1.1; margin: 0 0 18px; letter-spacing: -.5px; }
.hero p.lead { font-size: 19px; color: var(--muted); max-width: 640px; margin: 0 0 28px; }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: center; }
.hero-visual {
  border-radius: 20px; padding: 28px; color: #fff;
  background: linear-gradient(150deg, var(--primary-dark), var(--accent));
  box-shadow: var(--shadow-lg); min-height: 280px;
  display: grid; gap: 14px; align-content: center;
}
.hero-visual .stat { display: flex; align-items: baseline; gap: 10px; }
.hero-visual .stat b { font-size: 30px; }
.hero-visual .stat span { opacity: .85; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
.hero-badges .badge {
  background: rgba(255, 255, 255, .16); border: 1px solid rgba(255, 255, 255, .3);
  padding: 6px 12px; border-radius: 999px; font-size: 13px; font-weight: 600;
}

/* ---------- Trust bar ---------- */
.trustbar { background: var(--bg-alt); border-bottom: 1px solid var(--border); }
.trustbar .container { display: flex; flex-wrap: wrap; justify-content: center; gap: 28px; padding: 16px 20px; }
.trustbar .item { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 14px; font-weight: 600; }
.trustbar .item b { color: var(--primary); }

/* ---------- Sections ---------- */
.section { padding: 64px 0; }
.section.bg-white { background: #fff; }
.section.bg-alt { background: var(--bg-alt); }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 40px; }
.section-head .eyebrow { color: var(--accent); font-weight: 800; letter-spacing: 1px; text-transform: uppercase; font-size: 13px; }
.section-head h2 { font-size: clamp(26px, 3.5vw, 36px); margin: 8px 0 12px; }
.section-head p { color: var(--muted); font-size: 17px; margin: 0; }

/* ---------- Cards grid (CRITICAL: merged selector + auto-fill) ---------- */
.cards-grid, .cards-grid-2, .cards-grid-3, .cards-grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.cards-grid-2 { grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); }
.cards-grid-3 { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.cards-grid-4 { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }

.card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow); transition: .22s; display: flex; flex-direction: column; gap: 10px;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--primary-light); }
.card .card-icon { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; font-size: 22px;
  background: linear-gradient(135deg, rgba(61,47,143,.12), rgba(14,140,150,.14)); }
.card h3 { margin: 4px 0 0; font-size: 19px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card .card-link { margin-top: auto; font-weight: 700; color: var(--primary); }
.card.feature { background: linear-gradient(160deg, #fff, #f6f5fe); }

/* ---------- Stats row ---------- */
.stats-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 20px; }
.stat-box { text-align: center; padding: 26px 16px; border-radius: var(--radius); background: #fff; border: 1px solid var(--border); box-shadow: var(--shadow); }
.stat-box b { display: block; font-size: 34px; color: var(--primary); line-height: 1; }
.stat-box span { color: var(--muted); font-size: 14px; }

/* ---------- Steps / journey ---------- */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; counter-reset: step; }
.step { position: relative; padding: 26px 22px 22px; border-radius: var(--radius); background: #fff; border: 1px solid var(--border); box-shadow: var(--shadow); }
.step::before { counter-increment: step; content: counter(step); position: absolute; top: -16px; left: 22px;
  width: 36px; height: 36px; border-radius: 50%; background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff;
  display: grid; place-items: center; font-weight: 800; box-shadow: var(--shadow); }
.step h4 { margin: 14px 0 6px; font-size: 17px; }
.step p { margin: 0; color: var(--muted); font-size: 14px; }

/* ---------- Page banner (article/guide header) ---------- */
.page-banner { background: linear-gradient(135deg, var(--primary-dark), var(--primary)); color: #fff; padding: 56px 0 44px; }
.page-banner .breadcrumb { font-size: 13px; opacity: .8; margin-bottom: 12px; }
.page-banner .breadcrumb a { color: #fff; opacity: .9; }
.page-banner h1 { font-size: clamp(28px, 4vw, 40px); margin: 0 0 10px; }
.page-banner p { max-width: 680px; opacity: .9; margin: 0; font-size: 17px; }

/* ---------- Article layout ---------- */
.article-layout { display: grid; grid-template-columns: 1fr 320px; gap: 40px; align-items: start; }
.article-main { min-width: 0; }
.article-meta { display: flex; flex-wrap: wrap; gap: 14px; color: var(--muted); font-size: 14px; margin-bottom: 18px; }
.article-body { font-size: 16.5px; }
.article-body h2 { font-size: 24px; margin: 32px 0 12px; }
.article-body h3 { font-size: 19px; margin: 24px 0 8px; }
.article-body p { margin: 0 0 16px; }
.article-body ul, .article-body ol { margin: 0 0 16px; padding-left: 22px; }
.article-body li { margin: 6px 0; }
.article-body blockquote { margin: 18px 0; padding: 14px 18px; border-left: 4px solid var(--accent); background: var(--bg-alt); border-radius: var(--radius-sm); color: var(--muted); }
.article-sidebar { position: sticky; top: 86px; display: grid; gap: 18px; }
.sidebar-cta { background: linear-gradient(160deg, var(--primary), var(--accent)); color: #fff; border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.sidebar-cta h4 { margin: 0 0 8px; }
.sidebar-cta p { font-size: 14px; opacity: .92; margin: 0 0 14px; }
.sidebar-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }
.sidebar-card h4 { margin: 0 0 10px; font-size: 15px; }
.sidebar-card ul { margin: 0; padding-left: 18px; font-size: 14px; color: var(--muted); }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--border); box-shadow: var(--shadow); }
table.data { width: 100%; border-collapse: collapse; font-size: 15px; min-width: 560px; }
table.data th, table.data td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border); }
table.data th { background: var(--bg-alt); color: var(--primary); font-weight: 700; }
table.data tr:last-child td { border-bottom: 0; }

/* ---------- FAQ ---------- */
.faq-item { border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 12px; overflow: hidden; background: #fff; }
.faq-q { width: 100%; text-align: left; background: none; border: 0; padding: 18px 20px; font-size: 17px; font-weight: 700; cursor: pointer; display: flex; justify-content: space-between; gap: 12px; color: var(--ink); }
.faq-q .plus { color: var(--primary); font-size: 22px; transition: .2s; }
.faq-item.open .faq-q .plus { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-a .faq-a-inner { padding: 0 20px 18px; color: var(--muted); }

/* ---------- Forms ---------- */
.form-grid { display: grid; gap: 16px; max-width: 520px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-weight: 600; font-size: 14px; }
.field input, .field select, .field textarea {
  padding: 11px 13px; border: 1px solid var(--border); border-radius: var(--radius-sm); font: inherit; font-size: 15px; background: #fff;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--primary-light); border-color: var(--primary-light); }
.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.filter-bar select, .filter-bar input { padding: 9px 12px; border: 1px solid var(--border); border-radius: 999px; font: inherit; font-size: 14px; }

/* ---------- Contact cards ---------- */
.contact-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; }
.contact-card { text-align: center; padding: 24px; border-radius: var(--radius); background: #fff; border: 1px solid var(--border); box-shadow: var(--shadow); }
.contact-card .ic { font-size: 26px; }
.contact-card a { font-weight: 700; }

/* ---------- CTA band ---------- */
.cta-band { background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; border-radius: 20px; padding: 48px; text-align: center; margin: 0 auto; max-width: var(--maxw); box-shadow: var(--shadow-lg); }
.cta-band h2 { color: #fff; font-size: clamp(24px, 3vw, 32px); margin: 0 0 12px; }
.cta-band p { opacity: .92; max-width: 620px; margin: 0 auto 22px; font-size: 17px; }
.cta-band .btn-ghost { background: #fff; color: var(--primary); }

/* ---------- Footer ---------- */
.footer { background: var(--primary-dark); color: #d9d9f0; padding: 52px 0 26px; margin-top: 60px; }
.footer a { color: #cfc9f5; }
.footer a:hover { color: #fff; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; }
.footer h4 { color: #fff; font-size: 15px; margin: 0 0 14px; }
.footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; font-size: 14px; }
.footer .brand { font-size: 19px; font-weight: 800; color: #fff; margin-bottom: 10px; }
.footer .brand span { color: var(--accent-light); }
.footer p { font-size: 14px; color: #b9b6e0; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.14); margin-top: 32px; padding-top: 18px; font-size: 13px; color: #9b97cc; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; }

/* ---------- Toast ---------- */
.toast { position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%) translateY(20px); background: var(--ink); color: #fff; padding: 13px 20px; border-radius: 999px; box-shadow: var(--shadow-lg); opacity: 0; pointer-events: none; transition: .3s; z-index: 200; font-size: 15px; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.ok { background: #1e7d4f; }
.toast.err { background: #b23b3b; }

/* ---------- Machine-translation disclaimer (also appended by css_base) ---------- */
.mt-disclaimer { background: #FFF8E1; color: #7a5b00; font-size: 13px; padding: 8px 16px; text-align: center; line-height: 1.5; }

/* ---------- Language switcher (injected by i18n_build) ---------- */
.lang-switch { display: flex; flex-wrap: wrap; gap: 4px 16px; align-items: center; padding: 6px 16px; background: var(--primary-dark, #2A1F63); font-size: 13px; line-height: 1.4; }
.lang-switch a { color: #fff; opacity: .85; text-decoration: none; font-weight: 500; white-space: nowrap; }
.lang-switch a:hover { opacity: 1; text-decoration: underline; }
.lang-switch a.active { opacity: 1; font-weight: 700; }
.lang-switch a.active::after { content: " \2022"; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav-links { display: none; position: absolute; top: 100%; right: 0; left: 0; flex-direction: column; gap: 0;
    background: #fff; border-bottom: 1px solid var(--border); padding: 8px 20px 16px; box-shadow: var(--shadow); }
  .nav-links.open { display: flex; }
  .nav-links li { padding: 10px 0; border-bottom: 1px solid var(--border); }
  .nav-links .nav-cta { margin: 10px 0 0; }
  .nav-toggle { display: block; }
  .footer-grid { grid-template-columns: 1fr; }
  .cta-band { padding: 34px 22px; }
}