/* ============================================================
   梦想国际官网 - style.css
   国际旅游AI / 全球签证AI 静态站点样式
   ============================================================ */

:root{
  --c-bg: #FAF7F1;
  --c-bg-alt: #F1ECE1;
  --c-surface: #FFFFFF;
  --c-navy: #10243E;
  --c-navy-2: #16324F;
  --c-cyan: #0E8C8C;
  --c-cyan-2: #0B7373;
  --c-graphite: #3B3F45;
  --c-graphite-soft: #6B7178;
  --c-green: #1E8A5F;
  --c-orange: #E07B33;
  --c-line: #E4DDCE;
  --c-line-dark: #223A5A;
  --radius-s: 6px;
  --radius-m: 12px;
  --radius-l: 20px;
  --shadow-s: 0 1px 3px rgba(16,36,62,.08);
  --shadow-m: 0 6px 24px rgba(16,36,62,.10);
  --maxw: 1180px;
  --font-base: "Noto Sans SC","PingFang SC","Microsoft YaHei","Hiragino Sans GB",-apple-system,BlinkMacSystemFont,sans-serif;
}

*,*::before,*::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  font-family: var(--font-base);
  background: var(--c-bg);
  color: var(--c-graphite);
  line-height: 1.85;
  font-size: 16px;
  overflow-x: hidden;
}
img,svg{ max-width:100%; display:block; }
a{ color: var(--c-cyan-2); text-decoration:none; }
a:hover{ text-decoration: underline; }
ul,ol{ padding-left: 1.3em; }
h1,h2,h3,h4{ color: var(--c-navy); line-height:1.4; margin:0 0 .6em; font-weight:700; }
p{ margin:0 0 1em; }
.container{ max-width: var(--maxw); margin:0 auto; padding:0 20px; width:100%; }
section{ padding: 56px 0; }
.section-alt{ background: var(--c-bg-alt); }
.section-navy{ background: var(--c-navy); color:#EFEFE9; }
.section-navy h2,.section-navy h3{ color:#fff; }
.tag{
  display:inline-block; font-size:.78rem; letter-spacing:.04em; color:var(--c-cyan-2);
  background: rgba(14,140,140,.09); border:1px solid rgba(14,140,140,.25);
  border-radius: 999px; padding:3px 12px; margin-bottom:10px; font-weight:600;
}
.eyebrow{ color:var(--c-orange); font-weight:700; font-size:.85rem; letter-spacing:.06em; }

/* ---------- Header / Nav ---------- */
.site-header{
  position: sticky; top:0; z-index: 50;
  background: rgba(250,247,241,.94);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--c-line);
}
.nav-wrap{ display:flex; align-items:center; justify-content:space-between; padding:12px 20px; max-width: var(--maxw); margin:0 auto; }
.brand{ display:flex; align-items:center; gap:10px; font-weight:800; color:var(--c-navy); font-size:1.15rem; }
.brand img{ width:38px; height:38px; }
.brand:hover{ text-decoration:none; }
.main-nav{ display:flex; gap:2px; }
.main-nav a{
  color: var(--c-graphite); font-weight:600; font-size:.96rem;
  padding:10px 14px; border-radius: var(--radius-s);
}
.main-nav a:hover,.main-nav a.active{ background: var(--c-navy); color:#fff; text-decoration:none; }
.nav-toggle{ display:none; background:none; border:1px solid var(--c-line-dark); border-radius:var(--radius-s); width:42px; height:38px; cursor:pointer; }
.nav-toggle span{ display:block; width:20px; height:2px; background:var(--c-navy); margin:4px auto; }

/* ---------- Hero ---------- */
.hero{
  padding: 64px 0 48px;
  background: linear-gradient(160deg, var(--c-navy) 0%, var(--c-navy-2) 55%, var(--c-cyan-2) 130%);
  color:#F3F1E8;
  position:relative;
  overflow:hidden;
}
.hero .container{ display:grid; grid-template-columns: 1.15fr .85fr; gap:40px; align-items:center; }
.hero h1{ color:#fff; font-size:2.1rem; margin-bottom:.5em; }
.hero p.lead{ font-size:1.05rem; color:#E4E2D6; max-width: 56ch; }
.hero-actions{ display:flex; gap:12px; margin-top: 20px; flex-wrap:wrap; }
.btn{
  display:inline-block; padding:12px 22px; border-radius: 999px; font-weight:700;
  font-size:.95rem; border:1px solid transparent; cursor:pointer;
}
.btn-primary{ background: var(--c-orange); color:#fff; }
.btn-primary:hover{ background:#c96a28; text-decoration:none; }
.btn-outline{ background: transparent; color:#fff; border-color: rgba(255,255,255,.55); }
.btn-outline:hover{ background: rgba(255,255,255,.12); text-decoration:none; }
.btn-outline-dark{ background: transparent; color: var(--c-navy); border-color: var(--c-navy); }
.btn-outline-dark:hover{ background: var(--c-navy); color:#fff; text-decoration:none; }
.hero-art{ background: rgba(255,255,255,.06); border:1px solid rgba(255,255,255,.16); border-radius: var(--radius-l); padding:18px; }

/* ---------- Chain / flow ---------- */
.chain{
  display:flex; flex-wrap:wrap; gap:8px; align-items:center; justify-content:center;
  margin: 18px 0;
}
.chain span.node{
  background: var(--c-surface); border:1px solid var(--c-line); border-radius: 999px;
  padding:7px 14px; font-size:.86rem; font-weight:600; color: var(--c-navy); box-shadow: var(--shadow-s);
}
.chain span.arrow{ color: var(--c-graphite-soft); font-size:.9rem; }
.section-navy .chain span.node{ background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.25); color:#fff; }

/* ---------- Cards / Grid ---------- */
.grid{ display:grid; gap:24px; }
.grid-2{ grid-template-columns: repeat(2,1fr); }
.grid-3{ grid-template-columns: repeat(3,1fr); }
.grid-4{ grid-template-columns: repeat(4,1fr); }
.card{
  background: var(--c-surface); border:1px solid var(--c-line); border-radius: var(--radius-m);
  padding:22px; box-shadow: var(--shadow-s);
}
.card h3{ font-size:1.05rem; }
.card .icon{ width:44px; height:44px; margin-bottom:12px; }

/* ---------- Article blocks (homepage feature articles) ---------- */
.feature-article{
  background: var(--c-surface); border:1px solid var(--c-line); border-radius: var(--radius-l);
  padding: 32px; margin-bottom: 30px; box-shadow: var(--shadow-m);
  display:grid; grid-template-columns: 1fr 260px; gap: 30px;
}
.feature-article .meta{ font-size:.85rem; color: var(--c-graphite-soft); margin-bottom:8px; }
.feature-article .meta .cat{ color: var(--c-cyan-2); font-weight:700; }
.feature-article h3{ font-size:1.35rem; margin-bottom: .5em; }
.feature-article .lede{ font-weight:600; color: var(--c-navy-2); }
.feature-article .art-figure{ align-self:start; background: var(--c-bg-alt); border-radius: var(--radius-m); padding:14px; }
.feature-article .art-figure figcaption{ font-size:.78rem; color: var(--c-graphite-soft); margin-top:8px; }
.feature-article .body-more{ border-top:1px dashed var(--c-line); margin-top:16px; padding-top:16px; }

.obs-article{
  background: var(--c-bg-alt); border:1px solid var(--c-line); border-radius: var(--radius-m);
  padding:24px; margin-bottom:18px;
}
.obs-article h4{ font-size:1.1rem; }

/* ---------- Secondary article (on sub pages) ---------- */
.article{
  background: var(--c-surface); border:1px solid var(--c-line); border-radius: var(--radius-l);
  padding: 30px; margin-bottom: 26px;
}
.article .meta{ font-size:.85rem; color:var(--c-graphite-soft); margin-bottom:10px; }
.article h2{ font-size:1.4rem; }
.article figure{ margin: 18px 0; background: var(--c-bg-alt); border-radius: var(--radius-m); padding:16px; }
.article figcaption{ font-size:.8rem; color:var(--c-graphite-soft); margin-top:8px; }
.article table{ width:100%; border-collapse: collapse; font-size:.92rem; }
.article th,.article td{ border:1px solid var(--c-line); padding:8px 10px; text-align:left; }
.article th{ background: var(--c-bg-alt); }
.table-scroll{ overflow-x:auto; margin:16px 0; }
.callout{
  border-left:4px solid var(--c-orange); background: #FBF1E6; border-radius: var(--radius-s);
  padding: 14px 18px; margin: 16px 0; font-size:.95rem;
}
.callout.green{ border-color: var(--c-green); background:#EAF5EE; }
.callout.navy{ border-color: var(--c-navy); background:#EAF0F6; }

/* ---------- Index summary rollup cards ---------- */
.rollup-card{
  border:1px solid var(--c-line); border-radius: var(--radius-m); background: var(--c-surface);
  padding: 18px; margin-bottom:14px;
}
.rollup-card .meta{ font-size:.78rem; color:var(--c-graphite-soft); }
.rollup-card h4{ font-size:1rem; margin:.3em 0 .5em; }
.rollup-card p{ font-size:.92rem; margin-bottom:.4em; }
.rollup-more{ text-align:center; margin-top: 10px; }

/* ---------- Timeline ---------- */
.timeline{ position:relative; padding-left: 28px; }
.timeline::before{ content:""; position:absolute; left:8px; top:4px; bottom:4px; width:2px; background: var(--c-line-dark); opacity:.25; }
.timeline-item{ position:relative; margin-bottom: 18px; }
.timeline-item::before{
  content:""; position:absolute; left:-28px; top:4px; width:12px; height:12px; border-radius:50%;
  background: var(--c-cyan); border:2px solid #fff; box-shadow:0 0 0 2px var(--c-cyan);
}
.timeline-item .t-time{ font-weight:700; color:var(--c-navy); }
.timeline-item.fixed::before{ background: var(--c-orange); box-shadow:0 0 0 2px var(--c-orange); }

/* ---------- Tabs (intensity / area compare) ---------- */
.tabs{ display:flex; gap:8px; flex-wrap:wrap; margin-bottom:16px; }
.tab-btn{
  background: var(--c-surface); border:1px solid var(--c-line); border-radius:999px;
  padding:8px 18px; font-weight:600; cursor:pointer; font-size:.9rem; color:var(--c-graphite);
}
.tab-btn.active{ background: var(--c-navy); color:#fff; border-color:var(--c-navy); }
.tab-panel{ display:none; }
.tab-panel.active{ display:block; }

/* ---------- FAQ ---------- */
.faq-item{ border-bottom:1px solid var(--c-line); padding: 14px 0; }
.faq-q{
  display:flex; justify-content:space-between; align-items:center; cursor:pointer;
  font-weight:700; color: var(--c-navy); gap:12px;
}
.faq-q .plus{ font-size:1.3rem; color:var(--c-cyan-2); flex-shrink:0; transition: transform .2s; }
.faq-item.open .faq-q .plus{ transform: rotate(45deg); }
.faq-a{ max-height:0; overflow:hidden; transition: max-height .25s ease; font-size:.95rem; color:var(--c-graphite); }
.faq-item.open .faq-a{ max-height: 600px; margin-top:10px; }

/* ---------- App feature grid ---------- */
.feat-grid{ display:grid; grid-template-columns: repeat(4,1fr); gap:18px; }
.feat-grid .card{ text-align:center; }

/* ---------- Download entries ---------- */
.download-grid{ display:grid; grid-template-columns: repeat(3,1fr); gap:20px; }
.download-card{
  background: var(--c-surface); border:1px solid var(--c-line); border-radius: var(--radius-m);
  padding:24px; text-align:center;
}
.download-card .status{ display:inline-block; margin-top:10px; font-size:.82rem; padding:4px 12px; border-radius:999px; background:#F1ECE1; color:var(--c-graphite-soft); }

/* ---------- Footer ---------- */
.site-footer{ background: var(--c-navy); color:#C9CFD8; padding: 48px 0 24px; font-size:.9rem; }
.site-footer h4{ color:#fff; font-size:.95rem; margin-bottom:14px; }
.footer-grid{ display:grid; grid-template-columns: 1.4fr 1fr 1fr 1.4fr; gap:32px; margin-bottom: 30px;}
.footer-grid a{ color:#C9CFD8; display:block; margin-bottom:8px; }
.footer-grid a:hover{ color:#fff; }
.footer-disclaimer{ border-top:1px solid rgba(255,255,255,.12); padding-top:20px; font-size:.8rem; color:#9AA4B2; line-height:1.9; }
.footer-bottom{ margin-top:18px; font-size:.8rem; color:#8894A3; display:flex; justify-content:space-between; flex-wrap:wrap; gap:8px;}
.icp-slot{ color:#8894A3; }

/* ---------- Breadcrumb ---------- */
.breadcrumb{ font-size:.85rem; color: var(--c-graphite-soft); padding: 14px 0 0; }
.breadcrumb a{ color: var(--c-graphite-soft); }

/* ---------- Page hero (secondary pages) ---------- */
.page-hero{ padding: 40px 0 30px; background: var(--c-bg-alt); border-bottom:1px solid var(--c-line); }
.page-hero h1{ font-size:1.8rem; margin-bottom:.4em; }
.page-hero .lead{ max-width:70ch; color: var(--c-graphite); }

/* ---------- Assistant demo ---------- */
.assistant-box{ background: var(--c-surface); border:1px solid var(--c-line); border-radius: var(--radius-l); padding:22px; box-shadow: var(--shadow-m); }
.assistant-q{ background: var(--c-bg-alt); border-radius: var(--radius-m); padding:12px 16px; margin-bottom:10px; cursor:pointer; font-weight:600; color:var(--c-navy); }
.assistant-a{ display:none; border-left:3px solid var(--c-cyan); padding:10px 16px; margin: -6px 0 14px 10px; font-size:.93rem; background:#F3F8F7; border-radius:0 var(--radius-s) var(--radius-s) 0; }
.assistant-a.show{ display:block; }

/* ---------- Back to top ---------- */
.back-top{
  position: fixed; right:20px; bottom:20px; width:44px; height:44px; border-radius:50%;
  background: var(--c-navy); color:#fff; display:flex; align-items:center; justify-content:center;
  box-shadow: var(--shadow-m); opacity:0; pointer-events:none; transition: opacity .2s; z-index:40; cursor:pointer; border:none;
}
.back-top.show{ opacity:1; pointer-events:auto; }

/* ---------- Utility ---------- */
.mt-0{margin-top:0} .mb-0{margin-bottom:0}
.text-center{text-align:center}
.small{ font-size:.85rem; color:var(--c-graphite-soft); }
.section-title{ text-align:center; max-width: 720px; margin:0 auto 36px; }
.section-title h2{ font-size:1.7rem; }
.divider{ height:1px; background:var(--c-line); margin: 40px 0; border:none; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1024px){
  .grid-4{ grid-template-columns: repeat(2,1fr); }
  .feat-grid{ grid-template-columns: repeat(2,1fr); }
  .footer-grid{ grid-template-columns: 1fr 1fr; }
  .feature-article{ grid-template-columns: 1fr; }
  .feature-article .art-figure{ order:-1; }
}
@media (max-width: 860px){
  .hero .container{ grid-template-columns: 1fr; }
  .hero-art{ order:-1; }
  .grid-3{ grid-template-columns: repeat(2,1fr); }
  .download-grid{ grid-template-columns: 1fr; }
}
@media (max-width: 720px){
  .main-nav{
    position:absolute; top:100%; left:0; right:0; background: var(--c-bg);
    flex-direction:column; padding:10px 20px 18px; border-bottom:1px solid var(--c-line);
    display:none;
  }
  .main-nav.open{ display:flex; }
  .nav-toggle{ display:block; }
  .grid-2,.grid-3{ grid-template-columns: 1fr; }
  .feat-grid{ grid-template-columns: 1fr 1fr; }
  .hero h1{ font-size:1.55rem; }
  section{ padding: 40px 0; }
}
@media (max-width: 480px){
  .feat-grid{ grid-template-columns: 1fr; }
  .hero{ padding: 44px 0 32px; }
  .feature-article, .article{ padding:20px; }
  .container{ padding:0 14px; }
}