/* WPS Office Landing Site - Warm Terracotta Theme */
/* Unique design: split-panel hero, timeline features, horizontal scroll, accordion FAQ */

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

:root{
  --primary:#c0392b;
  --primary-dark:#962d22;
  --primary-light:#e74c3c;
  --accent:#e67e22;
  --accent-light:#f39c12;
  --bg:#fdf6f0;
  --bg-alt:#f5ebe0;
  --bg-dark:#1a1210;
  --text:#2c1810;
  --text-light:#6b4f3f;
  --text-inv:#fdf6f0;
  --card:#fff;
  --border:#e8d5c4;
  --shadow:0 4px 24px rgba(44,24,16,.08);
  --shadow-lg:0 12px 40px rgba(44,24,16,.12);
  --radius:12px;
  --radius-lg:20px;
  --transition:.3s cubic-bezier(.4,0,.2,1);
}

@keyframes spin{from{transform:rotate(0deg)}to{transform:rotate(360deg)}}
@keyframes fadeUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}
@keyframes pulse{0%,100%{opacity:.6}50%{opacity:1}}
@keyframes slideIn{from{opacity:0;transform:translateX(-20px)}to{opacity:1;transform:translateX(0)}}

html{scroll-behavior:smooth}

body{
  font-family:"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,sans-serif;
  line-height:1.7;color:var(--text);background:var(--bg);
  -webkit-font-smoothing:antialiased;
}

a{text-decoration:none;color:inherit;transition:color var(--transition)}
img{max-width:100%;display:block}
button{cursor:pointer;border:none;font-family:inherit}

/* ============== TOPBAR NAV ============== */
.topbar{
  position:fixed;top:0;left:0;right:0;z-index:999;
  background:rgba(253,246,240,.92);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border);
  transition:box-shadow var(--transition);
}
.topbar.scrolled{box-shadow:0 2px 20px rgba(44,24,16,.1)}
.topbar-inner{
  max-width:1140px;margin:0 auto;padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;height:64px;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.2rem;color:var(--primary)}
.brand svg{flex-shrink:0}
.nav-menu{display:flex;list-style:none;gap:8px}
.nav-menu a{
  display:inline-block;padding:8px 18px;border-radius:8px;
  font-size:.95rem;font-weight:500;color:var(--text-light);
  transition:all var(--transition);
}
.nav-menu a:hover{color:var(--primary);background:rgba(192,57,43,.06)}
.nav-menu a.on{color:var(--primary);background:rgba(192,57,43,.1);font-weight:600}
.mob-toggle{display:none;background:none;padding:6px}

/* ============== HERO - CENTERED ============== */
.hero-split{
  margin-top:64px;
  display:flex;align-items:center;justify-content:center;
  padding:48px 24px;
  background:linear-gradient(135deg,var(--bg) 0%,var(--bg-alt) 100%);
}
.hero-split>.hero-content{order:1}
.hero-split>.hero-visual{order:2}
.hero-inner{
  display:flex;align-items:center;justify-content:center;gap:60px;
  max-width:1000px;width:100%;flex-wrap:wrap;
}
.hero-content{
  display:flex;flex-direction:column;justify-content:center;
  flex:1 1 380px;min-width:300px;
}
.hero-badge{
  display:inline-flex;align-items:center;gap:6px;
  background:rgba(192,57,43,.08);color:var(--primary);
  padding:6px 14px;border-radius:20px;font-size:.82rem;font-weight:600;
  width:fit-content;margin-bottom:20px;
}
.hero-badge svg{flex-shrink:0}
.hero-title{
  font-size:clamp(2rem,4vw,3.2rem);font-weight:800;
  line-height:1.2;color:var(--text);margin-bottom:16px;
}
.hero-title em{font-style:normal;color:var(--primary)}
.hero-desc{font-size:1.1rem;color:var(--text-light);max-width:480px;margin-bottom:32px;line-height:1.8}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}

.hero-visual{
  flex:0 0 auto;
  width:280px;height:280px;border-radius:var(--radius-lg);
  background:linear-gradient(135deg,var(--primary) 0%,var(--accent) 100%);
  display:flex;align-items:center;justify-content:center;
  position:relative;overflow:hidden;
  box-shadow:0 20px 60px rgba(192,57,43,.25);
}
.hero-visual::before{
  content:"";position:absolute;width:160px;height:160px;
  border-radius:50%;background:rgba(255,255,255,.06);
  top:-40px;right:-40px;
}
.hero-visual::after{
  content:"";position:absolute;width:120px;height:120px;
  border-radius:50%;background:rgba(255,255,255,.04);
  bottom:-30px;left:-30px;
}
.hero-graphic{
  position:relative;z-index:2;animation:float 4s ease-in-out infinite;
  display:flex;flex-direction:column;align-items:center;gap:10px;
}
.hero-graphic .doc-icon{filter:drop-shadow(0 10px 20px rgba(0,0,0,.2))}

/* ============== BUTTONS ============== */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:14px 28px;border-radius:10px;font-size:.95rem;font-weight:600;
  transition:all var(--transition);border:none;
}
.btn-primary{
  background:var(--primary);color:#fff;
  box-shadow:0 4px 16px rgba(192,57,43,.3);
}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 6px 24px rgba(192,57,43,.4)}
.btn-primary:disabled{opacity:.7;cursor:wait;transform:none}
.btn-outline{
  background:transparent;color:var(--primary);
  border:2px solid var(--primary);
}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-ghost{
  background:rgba(255,255,255,.15);color:#fff;
  border:2px solid rgba(255,255,255,.3);backdrop-filter:blur(4px);
}
.btn-ghost:hover{background:rgba(255,255,255,.25)}
.btn-accent{
  background:var(--accent);color:#fff;
  box-shadow:0 4px 16px rgba(230,126,34,.3);
}
.btn-accent:hover{background:#cf6d17;transform:translateY(-2px)}
.btn-accent:disabled{opacity:.7;cursor:wait;transform:none}
.btn-lg{padding:16px 36px;font-size:1.05rem;border-radius:12px}
.btn-sm{padding:10px 20px;font-size:.88rem}
.btn-block{width:100%;justify-content:center}

/* ============== SECTIONS ============== */
.section{padding:80px 24px}
.section-alt{background:var(--bg-alt)}
.section-dark{background:var(--bg-dark);color:var(--text-inv)}
.wrap{max-width:1140px;margin:0 auto}
.sec-header{text-align:center;max-width:640px;margin:0 auto 56px}
.sec-header h2{font-size:clamp(1.6rem,3vw,2.4rem);font-weight:700;margin-bottom:12px}
.sec-header p{color:var(--text-light);font-size:1.05rem}
.section-dark .sec-header p{color:rgba(253,246,240,.65)}

/* ============== TIMELINE FEATURES ============== */
.timeline{position:relative;padding-left:40px}
.timeline::before{
  content:"";position:absolute;left:15px;top:0;bottom:0;
  width:2px;background:linear-gradient(180deg,var(--primary),var(--accent));
  border-radius:2px;
}
.tl-item{
  position:relative;padding:0 0 48px 32px;
  animation:slideIn .6s ease both;
}
.tl-item:last-child{padding-bottom:0}
.tl-dot{
  position:absolute;left:-32px;top:4px;width:14px;height:14px;
  border-radius:50%;background:var(--primary);border:3px solid var(--bg);
  box-shadow:0 0 0 3px var(--primary);
}
.tl-item:nth-child(even) .tl-dot{background:var(--accent);box-shadow:0 0 0 3px var(--accent)}
.tl-content{
  background:var(--card);border-radius:var(--radius);padding:28px 32px;
  box-shadow:var(--shadow);border:1px solid var(--border);
  transition:all var(--transition);
}
.tl-content:hover{box-shadow:var(--shadow-lg);transform:translateX(6px)}
.tl-content h3{font-size:1.15rem;font-weight:700;margin-bottom:8px;display:flex;align-items:center;gap:10px}
.tl-content h3 svg{color:var(--primary);flex-shrink:0}
.tl-content p{color:var(--text-light);font-size:.95rem}

/* ============== STAT STRIP ============== */
.stat-strip{
  display:grid;grid-template-columns:repeat(4,1fr);gap:24px;
  padding:48px 0;
}
.stat-box{text-align:center}
.stat-num{
  font-size:clamp(1.8rem,3vw,2.8rem);font-weight:800;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
}
.stat-label{font-size:.9rem;color:var(--text-light);margin-top:4px}

/* ============== PLATFORM CARDS (HORIZONTAL) ============== */
.plat-row{
  display:grid;grid-template-columns:repeat(4,1fr);gap:20px;
}
.plat-card{
  background:var(--card);border-radius:var(--radius-lg);padding:32px 24px;
  text-align:center;border:1px solid var(--border);
  transition:all var(--transition);position:relative;overflow:hidden;
}
.plat-card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:4px;
  background:linear-gradient(90deg,var(--primary),var(--accent));
  transform:scaleX(0);transition:transform var(--transition);
  transform-origin:left;
}
.plat-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-6px)}
.plat-card:hover::before{transform:scaleX(1)}
.plat-ico{
  width:56px;height:56px;border-radius:14px;
  background:rgba(192,57,43,.06);
  display:flex;align-items:center;justify-content:center;
  margin:0 auto 16px;color:var(--primary);
}
.plat-card h3{font-size:1.05rem;font-weight:700;margin-bottom:6px}
.plat-card p{font-size:.85rem;color:var(--text-light);margin-bottom:16px}
.plat-tag{
  display:inline-block;padding:4px 12px;border-radius:20px;
  font-size:.75rem;font-weight:600;background:rgba(192,57,43,.08);color:var(--primary);
  margin-bottom:16px;
}

/* ============== TESTIMONIALS ============== */
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{
  background:var(--card);border-radius:var(--radius);padding:28px;
  border:1px solid var(--border);transition:all var(--transition);
}
.review-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px)}
.review-stars{display:flex;gap:2px;color:var(--accent);margin-bottom:12px}
.review-text{font-size:.95rem;color:var(--text-light);margin-bottom:16px;font-style:italic;line-height:1.7}
.review-author{display:flex;align-items:center;gap:10px}
.review-avatar{
  width:40px;height:40px;border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:700;font-size:.9rem;
}
.review-info strong{font-size:.9rem;display:block}
.review-info span{font-size:.8rem;color:var(--text-light)}

/* ============== FAQ ACCORDION ============== */
.faq-list{max-width:760px;margin:0 auto}
.faq-item{
  border:1px solid var(--border);border-radius:var(--radius);
  margin-bottom:12px;overflow:hidden;background:var(--card);
  transition:all var(--transition);
}
.faq-item:hover{border-color:rgba(192,57,43,.3)}
.faq-item.open{border-color:var(--primary);box-shadow:0 2px 12px rgba(192,57,43,.08)}
.faq-q{
  padding:18px 24px;display:flex;align-items:center;justify-content:space-between;
  cursor:pointer;font-weight:600;font-size:.95rem;
  transition:background var(--transition);gap:12px;
}
.faq-q:hover{background:rgba(192,57,43,.03)}
.faq-q svg{flex-shrink:0;transition:transform var(--transition);color:var(--primary)}
.faq-item.open .faq-q svg{transform:rotate(180deg)}
.faq-a{
  max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease;
}
.faq-item.open .faq-a{max-height:600px;padding:0 24px 20px}
.faq-a p{color:var(--text-light);font-size:.92rem;line-height:1.8}

/* ============== CTA BANNER ============== */
.cta-banner{
  background:linear-gradient(135deg,var(--primary) 0%,var(--accent) 100%);
  border-radius:var(--radius-lg);padding:56px 48px;
  text-align:center;color:#fff;position:relative;overflow:hidden;
}
.cta-banner::before{
  content:"";position:absolute;width:250px;height:250px;
  border-radius:50%;background:rgba(255,255,255,.06);
  top:-80px;right:-40px;
}
.cta-banner h2{font-size:clamp(1.5rem,3vw,2.2rem);font-weight:700;margin-bottom:12px}
.cta-banner p{font-size:1.05rem;opacity:.9;margin-bottom:28px;max-width:500px;margin-left:auto;margin-right:auto}

/* ============== COMPARISON TABLE ============== */
.cmp-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
.cmp-table{
  width:100%;border-collapse:collapse;min-width:600px;
  background:var(--card);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);
}
.cmp-table th,.cmp-table td{padding:14px 20px;text-align:left;font-size:.92rem}
.cmp-table thead th{
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff;font-weight:600;
}
.cmp-table tbody tr{border-bottom:1px solid var(--border)}
.cmp-table tbody tr:last-child{border-bottom:none}
.cmp-table tbody tr:hover{background:rgba(192,57,43,.03)}
.cmp-table .check{color:#27ae60;font-weight:700}
.cmp-table .cross{color:#c0392b;font-weight:700}

/* ============== VERSION LOG ============== */
.ver-list{max-width:760px;margin:0 auto}
.ver-item{
  display:flex;gap:20px;padding:20px 0;
  border-bottom:1px solid var(--border);
}
.ver-item:last-child{border-bottom:none}
.ver-tag{
  flex-shrink:0;padding:6px 14px;border-radius:8px;
  background:rgba(192,57,43,.08);color:var(--primary);
  font-weight:700;font-size:.85rem;height:fit-content;
}
.ver-info h4{font-size:.95rem;font-weight:600;margin-bottom:4px}
.ver-info p{font-size:.88rem;color:var(--text-light)}
.ver-date{font-size:.8rem;color:var(--text-light);margin-top:4px}

/* ============== TIPS GRID ============== */
.tips-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.tip-card{
  background:var(--card);border-radius:var(--radius);padding:28px;
  border-left:4px solid var(--primary);box-shadow:var(--shadow);
  transition:all var(--transition);
}
.tip-card:nth-child(even){border-left-color:var(--accent)}
.tip-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.tip-card h4{font-size:1rem;font-weight:700;margin-bottom:8px;display:flex;align-items:center;gap:8px}
.tip-card p{font-size:.9rem;color:var(--text-light);line-height:1.7}

/* ============== DOWNLOAD PAGE HERO ============== */
.dl-hero{
  margin-top:64px;padding:80px 24px 60px;
  background:linear-gradient(135deg,var(--bg) 60%,var(--bg-alt) 100%);
  text-align:center;
}
.dl-hero h1{font-size:clamp(1.8rem,3.5vw,2.8rem);font-weight:800;margin-bottom:12px}
.dl-hero p{font-size:1.1rem;color:var(--text-light);max-width:560px;margin:0 auto 36px}

/* main download card */
.dl-main{
  max-width:640px;margin:0 auto 60px;
  background:var(--card);border-radius:var(--radius-lg);padding:48px;
  box-shadow:var(--shadow-lg);border:1px solid var(--border);text-align:center;
  position:relative;overflow:hidden;
}
.dl-main::after{
  content:"";position:absolute;bottom:0;left:0;right:0;height:4px;
  background:linear-gradient(90deg,var(--primary),var(--accent));
}
.dl-main h2{font-size:1.6rem;font-weight:700;margin-bottom:8px}
.dl-main .dl-ver{font-size:.88rem;color:var(--text-light);margin-bottom:24px}
.dl-main .dl-size{
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 16px;border-radius:20px;background:rgba(192,57,43,.06);
  font-size:.82rem;color:var(--primary);font-weight:600;margin-bottom:24px;
}
.dl-reqs{text-align:left;margin-top:28px;padding-top:20px;border-top:1px solid var(--border)}
.dl-reqs h4{font-size:.92rem;font-weight:600;margin-bottom:8px}
.dl-reqs ul{list-style:none;padding:0}
.dl-reqs li{
  font-size:.85rem;color:var(--text-light);padding:4px 0;
  display:flex;align-items:center;gap:8px;
}
.dl-reqs li svg{color:#27ae60;flex-shrink:0}

/* ============== FEATURE ROWS (zigzag) ============== */
.feat-row{
  display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;
  padding:48px 0;
}
.feat-row:nth-child(even){direction:rtl}
.feat-row:nth-child(even) > *{direction:ltr}
.feat-icon-box{
  width:100%;aspect-ratio:4/3;border-radius:var(--radius-lg);
  background:linear-gradient(135deg,rgba(192,57,43,.06),rgba(230,126,34,.06));
  display:flex;align-items:center;justify-content:center;
  border:1px solid var(--border);
}
.feat-icon-box svg{color:var(--primary);opacity:.8}
.feat-text h3{font-size:1.3rem;font-weight:700;margin-bottom:10px}
.feat-text p{color:var(--text-light);font-size:.95rem;line-height:1.8}

/* ============== FOOTER ============== */
.site-footer{
  background:var(--bg-dark);color:rgba(253,246,240,.6);
  padding:40px 24px;text-align:center;font-size:.85rem;line-height:1.9;
}
.site-footer .security{
  color:rgba(253,246,240,.85);font-weight:600;margin-bottom:6px;
  display:flex;align-items:center;justify-content:center;gap:6px;
}
.site-footer .security svg{color:#27ae60;flex-shrink:0}

/* ============== RESPONSIVE ============== */
@media(max-width:1024px){
  .hero-split{grid-template-columns:1fr}
  .hero-content{padding:60px 24px 40px}
  .hero-visual{min-height:320px}
  .stat-strip{grid-template-columns:repeat(2,1fr)}
  .plat-row{grid-template-columns:repeat(2,1fr)}
  .reviews-grid{grid-template-columns:1fr 1fr}
  .feat-row{grid-template-columns:1fr;gap:24px}
  .feat-row:nth-child(even){direction:ltr}
  .tips-grid{grid-template-columns:1fr}
}

@media(max-width:640px){
  .topbar-inner{padding:0 16px}
  .nav-menu{
    display:none;position:fixed;top:64px;left:0;right:0;
    flex-direction:column;background:rgba(253,246,240,.98);
    backdrop-filter:blur(16px);padding:16px;gap:4px;
    border-bottom:1px solid var(--border);box-shadow:var(--shadow);
  }
  .nav-menu.show{display:flex}
  .nav-menu a{padding:12px 16px;border-radius:8px}
  .mob-toggle{display:block}
  .hero-content{padding:40px 16px 30px}
  .hero-actions{flex-direction:column}
  .hero-actions .btn{width:100%;justify-content:center}
  .stat-strip{grid-template-columns:1fr 1fr;gap:16px}
  .plat-row{grid-template-columns:1fr}
  .reviews-grid{grid-template-columns:1fr}
  .section{padding:48px 16px}
  .cta-banner{padding:36px 24px}
  .dl-main{padding:32px 20px}
  .faq-q{padding:14px 16px}
}