/* ================================================================
   web-chrome-google-zh.hl.cn — Topographic Expedition Theme
   Unique: sage/slate/cream palette, topo-line patterns, timeline
   features, stepped bands, numbered FAQ, terrain aesthetics
   ================================================================ */

@keyframes spin{from{transform:rotate(0deg)}to{transform:rotate(360deg)}}
@keyframes dash{to{stroke-dashoffset:0}}
@keyframes fadeSlide{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}

*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{
  font-family:"Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  color:#2d3a2e;background:#f4f1eb;line-height:1.75;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
button{cursor:pointer;font-family:inherit}
ul,ol{list-style:none}
img,svg{vertical-align:middle}

/* === Palette === */
:root{
  --sage:#5a7a5e;
  --sage-light:#8aad8e;
  --sage-dark:#3d5940;
  --slate:#3b4856;
  --slate-light:#5d7183;
  --cream:#f4f1eb;
  --cream-dark:#e8e3d9;
  --sand:#d4c9b4;
  --bark:#6b5b4e;
  --white:#ffffff;
  --accent:#c06830;
  --accent-light:#e8944c;
  --shadow:0 8px 32px rgba(59,72,86,.12);
  --shadow-lg:0 16px 48px rgba(59,72,86,.16);
  --radius:14px;
  --radius-lg:22px;
  --max:1140px;
}

/* === Utility === */
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}

/* === Topographic background pattern (SVG data-uri) === */
.topo-bg{
  background-image:
    url("data:image/svg+xml,%3Csvg width='400' height='400' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 200c60-40 120 20 200 0s140-60 200-20' fill='none' stroke='%235a7a5e' stroke-width='0.6' opacity='0.12'/%3E%3Cpath d='M0 240c80-30 140 30 200 10s120-50 200-30' fill='none' stroke='%235a7a5e' stroke-width='0.6' opacity='0.09'/%3E%3Cpath d='M0 160c50 20 110-30 200-10s150 40 200 10' fill='none' stroke='%235a7a5e' stroke-width='0.6' opacity='0.09'/%3E%3Cpath d='M0 280c70-20 130 40 200 20s130-60 200-20' fill='none' stroke='%235a7a5e' stroke-width='0.6' opacity='0.07'/%3E%3Cpath d='M0 120c60 30 120-20 200 0s140 50 200 20' fill='none' stroke='%235a7a5e' stroke-width='0.6' opacity='0.07'/%3E%3C/svg%3E");
  background-size:400px 400px;
}

/* ============ NAVIGATION — expedition pill bar ============ */
.topnav{
  position:sticky;top:0;z-index:500;
  background:rgba(244,241,235,.92);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:2px solid var(--sand);
}
.topnav .wrap{
  display:flex;align-items:center;justify-content:space-between;
  height:58px;
}
.brand{
  display:flex;align-items:center;gap:10px;
  font-weight:800;font-size:1rem;letter-spacing:.3px;
  color:var(--sage-dark);
}
.brand svg{flex-shrink:0}
.navlist{display:flex;align-items:center;gap:6px}
.navlist a{
  display:inline-block;padding:7px 20px;border-radius:30px;
  font-size:13.5px;font-weight:600;color:var(--slate-light);
  border:1.5px solid transparent;
  transition:all .3s ease;
}
.navlist a:hover{color:var(--sage-dark);border-color:var(--sage-light);background:rgba(90,122,94,.08)}
.navlist a.on{
  background:var(--sage);color:#fff;border-color:var(--sage);
}

/* ============ HERO — split layout with topo illustration ============ */
.hero-split{
  display:grid;grid-template-columns:1fr 1fr;gap:48px;
  align-items:center;padding:72px 0 56px;
}
.hero-text h1{
  font-size:42px;font-weight:800;line-height:1.2;
  color:var(--slate);margin-bottom:18px;
}
.hero-text h1 em{
  font-style:normal;color:var(--sage);
  border-bottom:3px solid var(--accent);
}
.hero-text .lead{
  font-size:17px;color:var(--slate-light);margin-bottom:32px;
  max-width:440px;
}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}

.hero-visual{
  position:relative;display:flex;align-items:center;justify-content:center;
  min-height:320px;
}
.hero-orb{
  width:260px;height:260px;border-radius:50%;
  background:radial-gradient(circle at 40% 35%,var(--sage-light),var(--sage-dark));
  box-shadow:0 0 60px rgba(90,122,94,.25);
  animation:float 4s ease-in-out infinite;
}
.hero-orb::after{
  content:"";position:absolute;inset:20px;border-radius:50%;
  border:2px dashed rgba(255,255,255,.25);
}
.hero-chrome{
  width:240px;height:240px;
  filter:drop-shadow(0 12px 40px rgba(66,133,244,.3));
  animation:float 4s ease-in-out infinite;
  position:relative;z-index:2;
}
.topo-ring{
  position:absolute;border-radius:50%;
  border:1.5px solid rgba(90,122,94,.2);
}
.topo-ring:nth-child(2){width:320px;height:320px}
.topo-ring:nth-child(3){width:380px;height:380px}
.topo-ring:nth-child(4){width:430px;height:430px}

/* ============ BUTTONS ============ */
.btn-sage{
  background:var(--sage);color:#fff;border:none;
  padding:13px 28px;border-radius:10px;font-size:15px;font-weight:700;
  display:inline-flex;align-items:center;gap:8px;
  box-shadow:0 4px 14px rgba(90,122,94,.3);
  transition:all .3s ease;
}
.btn-sage:hover{background:var(--sage-dark);transform:translateY(-2px);box-shadow:0 6px 20px rgba(90,122,94,.4)}
.btn-sage:disabled{opacity:.6;cursor:wait}

.btn-outline{
  background:transparent;color:var(--sage);
  border:2px solid var(--sage);
  padding:11px 24px;border-radius:10px;font-size:15px;font-weight:700;
  display:inline-flex;align-items:center;gap:8px;
  transition:all .3s ease;
}
.btn-outline:hover{background:var(--sage);color:#fff}

.btn-accent{
  background:var(--accent);color:#fff;border:none;
  padding:13px 28px;border-radius:10px;font-size:15px;font-weight:700;
  display:inline-flex;align-items:center;gap:8px;
  box-shadow:0 4px 14px rgba(192,104,48,.3);
  transition:all .3s ease;
}
.btn-accent:hover{background:#a85828;transform:translateY(-2px)}
.btn-accent:disabled{opacity:.6;cursor:wait}

.btn-white{
  background:#fff;color:var(--sage-dark);border:none;
  padding:13px 28px;border-radius:10px;font-size:15px;font-weight:700;
  display:inline-flex;align-items:center;gap:8px;
  transition:all .3s ease;
}
.btn-white:hover{background:var(--cream);transform:translateY(-2px)}

/* ============ SECTION TITLES ============ */
.sec-head{text-align:center;margin-bottom:48px}
.sec-head h2{
  font-size:32px;font-weight:800;color:var(--slate);
  display:inline-block;position:relative;
}
.sec-head h2::after{
  content:"";display:block;width:60px;height:3px;
  background:var(--accent);margin:12px auto 0;border-radius:2px;
}
.sec-head p{color:var(--slate-light);margin-top:12px;font-size:16px}

/* ============ TIMELINE FEATURES — horizontal stepped layout ============ */
.timeline{padding:64px 0}
.timeline-row{
  display:flex;align-items:stretch;gap:0;
  position:relative;margin-bottom:0;
}
.timeline-row::before{
  content:"";position:absolute;left:50%;top:0;bottom:0;
  width:3px;background:var(--sand);transform:translateX(-50%);
}
.tl-step{
  flex:1;padding:32px;position:relative;
}
.tl-step:nth-child(odd){text-align:right;padding-right:48px}
.tl-step:nth-child(even){text-align:left;padding-left:48px}
.tl-dot{
  position:absolute;top:36px;width:18px;height:18px;border-radius:50%;
  background:var(--sage);border:3px solid var(--cream);
  box-shadow:0 0 0 3px var(--sage-light);
  z-index:2;
}
.tl-step:nth-child(odd) .tl-dot{right:-9px}
.tl-step:nth-child(even) .tl-dot{left:-9px}
.tl-step h3{font-size:19px;font-weight:700;color:var(--sage-dark);margin-bottom:8px}
.tl-step p{color:var(--slate-light);font-size:15px;line-height:1.7}

/* ============ STEPPED BANDS — alternating cream/white sections ============ */
.band{padding:64px 0}
.band-cream{background:var(--cream);padding:64px 0}
.band-white{background:var(--white)}
.band-sage{background:var(--sage);color:#fff}
.band-slate{background:var(--slate);color:#e8e3d9}

/* ============ FEATURE TILES — staggered 2-col with icon ============ */
.stagger{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.tile{
  background:var(--white);border-radius:var(--radius);
  padding:28px;border-left:4px solid var(--sage);
  box-shadow:var(--shadow);transition:all .3s ease;
}
.tile:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.tile:nth-child(even){transform:translateY(20px)}
.tile:nth-child(even):hover{transform:translateY(17px)}
.tile-icon{
  width:44px;height:44px;border-radius:10px;
  background:linear-gradient(135deg,var(--sage-light),var(--sage));
  display:flex;align-items:center;justify-content:center;
  margin-bottom:14px;
}
.tile h3{font-size:17px;font-weight:700;color:var(--slate);margin-bottom:6px}
.tile p{font-size:14.5px;color:var(--slate-light);line-height:1.65}

/* ============ PLATFORM STRIP — horizontal scroll row ============ */
.plat-strip{
  display:flex;gap:20px;overflow-x:auto;
  padding:8px 4px 16px;scroll-snap-type:x mandatory;
  -webkit-overflow-scrolling:touch;
}
.plat-strip::-webkit-scrollbar{height:6px}
.plat-strip::-webkit-scrollbar-thumb{background:var(--sand);border-radius:3px}
.plat-card{
  flex:0 0 260px;scroll-snap-align:start;
  background:var(--white);border-radius:var(--radius);
  padding:28px;text-align:center;
  border:2px solid var(--cream-dark);
  transition:all .3s ease;
}
.plat-card:hover{border-color:var(--sage);box-shadow:var(--shadow)}
.plat-card.featured{border-color:var(--sage);background:rgba(90,122,94,.04)}
.plat-ico{
  width:56px;height:56px;border-radius:14px;margin:0 auto 14px;
  display:flex;align-items:center;justify-content:center;
}
.plat-card h3{font-size:17px;font-weight:700;color:var(--slate);margin-bottom:6px}
.plat-card p{font-size:13.5px;color:var(--slate-light);margin-bottom:16px;min-height:40px}
.plat-badge{
  display:inline-block;background:var(--sage-light);color:#fff;
  font-size:11px;font-weight:700;padding:3px 10px;border-radius:20px;
  margin-bottom:14px;
}

/* ============ NUMBERED FAQ ============ */
.faq-list{max-width:760px;margin:0 auto}
.faq-item{
  display:flex;gap:16px;margin-bottom:14px;
  background:var(--white);border-radius:var(--radius);
  overflow:hidden;box-shadow:0 2px 10px rgba(59,72,86,.07);
  border:1px solid var(--cream-dark);
}
.faq-num{
  flex:0 0 52px;display:flex;align-items:flex-start;justify-content:center;
  padding-top:18px;
  background:var(--sage);color:#fff;font-size:18px;font-weight:800;
}
.faq-body{flex:1;padding:0}
.faq-q{
  width:100%;padding:18px 18px 18px 0;background:none;border:none;
  text-align:left;font-size:15px;font-weight:700;color:var(--slate);
  cursor:pointer;display:flex;justify-content:space-between;align-items:center;
  transition:color .25s;
}
.faq-q:hover{color:var(--sage)}
.faq-chevron{transition:transform .3s;color:var(--sage);flex-shrink:0}
.faq-item.open .faq-chevron{transform:rotate(180deg)}
.faq-a{
  max-height:0;overflow:hidden;transition:all .35s ease;
  color:var(--slate-light);font-size:14.5px;line-height:1.7;
  padding:0 18px 0 0;
}
.faq-item.open .faq-a{max-height:400px;padding-bottom:18px}

/* ============ TESTIMONIALS — quote cards with terrain accent ============ */
.quote-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.quote-card{
  background:rgba(255,255,255,.12);backdrop-filter:blur(8px);
  border-radius:var(--radius);padding:28px;
  border-left:4px solid var(--accent-light);
}
.quote-card p{font-size:15px;line-height:1.7;margin-bottom:14px;font-style:italic;opacity:.95}
.quote-card .author{font-weight:700;font-size:14px}
.quote-card .role{font-size:13px;opacity:.7}

/* ============ CTA BANNER ============ */
.cta-banner{
  background:linear-gradient(135deg,var(--sage),var(--sage-dark));
  color:#fff;padding:56px 24px;text-align:center;
}
.cta-banner h2{font-size:30px;font-weight:800;margin-bottom:14px}
.cta-banner p{font-size:16px;opacity:.85;margin-bottom:28px;max-width:520px;margin-left:auto;margin-right:auto}

/* ============ SEO CONTENT — article style ============ */
.article{
  max-width:780px;margin:0 auto;padding:48px 32px;
  background:var(--white);border-radius:var(--radius-lg);
  box-shadow:var(--shadow);
}
.article section{margin-bottom:36px}
.article h2{
  font-size:22px;font-weight:800;color:var(--sage-dark);
  margin-bottom:14px;padding-left:16px;
  border-left:4px solid var(--accent);
}
.article h3{font-size:18px;font-weight:700;color:var(--slate);margin:20px 0 10px}
.article p{color:var(--slate-light);line-height:1.8;margin-bottom:14px}
.article ul,.article ol{color:var(--slate-light);line-height:1.8;margin-left:20px;margin-bottom:14px;list-style:disc}
.article ol{list-style:decimal}
.article li{margin-bottom:4px}
.article strong{color:var(--slate)}

/* ============ COMPARISON TABLE ============ */
.cmp-table{
  width:100%;border-collapse:collapse;margin:24px 0;
  background:var(--white);border-radius:var(--radius);
  overflow:hidden;box-shadow:0 2px 10px rgba(59,72,86,.08);
}
.cmp-table th,.cmp-table td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--cream-dark)}
.cmp-table th{background:var(--sage);color:#fff;font-weight:700;font-size:14px}
.cmp-table tr:last-child td{border-bottom:none}
.cmp-table .win{color:var(--sage-dark);font-weight:700}
.cmp-table .lose{color:var(--slate-light)}

/* ============ FOOTER ============ */
.site-footer{background:var(--slate);color:var(--cream-dark);padding:40px 24px;text-align:center}
.security-line{
  background:rgba(90,122,94,.15);border:1px solid rgba(90,122,94,.35);
  border-radius:10px;padding:14px 20px;margin-bottom:18px;
  color:var(--sage-light);font-weight:600;font-size:14px;
}
.copyright{color:var(--sand);font-size:13px;line-height:1.6}

/* ============ RESPONSIVE ============ */
@media(max-width:900px){
  .hero-split{grid-template-columns:1fr;text-align:center}
  .hero-text h1{font-size:34px}
  .hero-text .lead{margin:0 auto 28px}
  .hero-btns{justify-content:center}
  .hero-visual{min-height:240px;margin-top:20px}
  .hero-orb{width:200px;height:200px}
  .hero-chrome{width:180px;height:180px}
  .topo-ring:nth-child(2){width:250px;height:250px}
  .topo-ring:nth-child(3){width:300px;height:300px}
  .topo-ring:nth-child(4){width:340px;height:340px}
  .stagger{grid-template-columns:1fr}
  .tile:nth-child(even){transform:none}
  .tile:nth-child(even):hover{transform:translateY(-3px)}
  .quote-grid{grid-template-columns:1fr}
  .timeline-row{flex-direction:column}
  .timeline-row::before{left:24px}
  .tl-step{text-align:left!important;padding:16px 16px 16px 56px!important}
  .tl-step .tl-dot{left:15px!important;right:auto!important}
}
@media(max-width:600px){
  .topnav .wrap{padding:0 12px}
  .navlist a{padding:6px 14px;font-size:12.5px}
  .brand{font-size:.9rem}
  .hero-text h1{font-size:28px}
  .sec-head h2{font-size:26px}
  .plat-card{flex:0 0 220px;padding:20px}
  .article{padding:28px 18px;border-radius:var(--radius)}
}