/* ===== WeSignHK Design Language — SJB with Dark Mode & Slider (fixed) ===== */
*,
*::before,*::after{box-sizing:border-box}
:root{
  --bg:#f8fafc;
  --card:#ffffff;
  --text:#0f172a;
  --muted:#64748b;
  --brand:#2563eb;
  --brand-2:#7c3aed;
  --border:#e5e7eb;
  --shadow:0 6px 22px rgba(15,23,42,.06);
  --radius:16px;
  --sky:#38bdf8; /* 天蓝色 */
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0b1220;
    --card:#0f1628;
    --text:#e5e7eb;
    --muted:#9aa4b2;
    --brand:#5b8cff;
    --brand-2:#9a6bff;
    --border:#1f273a;
    --shadow:0 8px 28px rgba(0,0,0,.35);
    --sky:#38bdf8;
  }
}
html[data-theme="light"]{
  --bg:#f8fafc; --card:#ffffff; --text:#0f172a; --muted:#64748b;
  --brand:#2563eb; --brand-2:#7c3aed; --border:#e5e7eb; --shadow:0 6px 22px rgba(15,23,42,.06); --sky:#38bdf8;
}
html[data-theme="dark"]{
  --bg:#0b1220; --card:#0f1628; --text:#e5e7eb; --muted:#9aa4b2;
  --brand:#5b8cff; --brand-2:#9a6bff; --border:#1f273a; --shadow:0 8px 28px rgba(0,0,0,.35); --sky:#38bdf8;
}

html,body{height:100%}
body{
  margin:0;
  font:15.5px/1.65 ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,Helvetica,sans-serif;
  color:var(--text);
  background:linear-gradient(180deg, color-mix(in oklab, var(--card) 70%, var(--bg)), var(--bg) 35%, var(--bg) 100%);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}

/* Container */
.container{width:min(1120px,92vw);margin-inline:auto}

/* Header */
.site-header{
  background:color-mix(in oklab, var(--card) 80%, transparent);
  backdrop-filter:saturate(1.1) blur(8px);
  position:sticky;top:0;z-index:50;
  border-bottom:1px solid color-mix(in oklab, var(--border) 90%, transparent);
}
.header-row{display:flex;align-items:center;gap:14px;padding:10px 0}
.nav{margin-left:auto;display:flex;gap:8px;flex-wrap:wrap}
.nav-item{
  display:inline-flex;align-items:center;height:36px;padding:0 12px;border-radius:999px;
  color:var(--text);text-decoration:none;border:1px solid transparent;
}
.nav-item:hover{background:color-mix(in oklab, var(--card) 90%, var(--bg))}
.nav-item.is-active{border-color:var(--border);background:var(--card)}
.icon-btn{
  border:1px solid var(--border);
  background:var(--card); color:var(--text);
  height:36px; width:36px; border-radius:10px;
  display:none; align-items:center; justify-content:center;
}
.theme-toggle{margin-left:8px;display:inline-flex}
.theme-toggle .icon-moon{display:none}
html[data-theme="dark"] .theme-toggle .icon-sun{display:none}
html[data-theme="dark"] .theme-toggle .icon-moon{display:block}
@media (max-width: 900px){
  .icon-btn.menu-toggle{display:inline-flex}
  .nav{display:none;position:absolute;left:0;right:0;top:100%;background:var(--card);
       border-bottom:1px solid var(--border);padding:10px;gap:6px}
  .nav.open{display:flex;flex-wrap:wrap}
  .nav-item{flex:1 1 auto;justify-content:center;border:1px solid var(--border);background:var(--card);border-radius:10px}
}

/* 基本卡片/主栅格 */
.card{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);box-shadow:var(--shadow);
  padding:22px;
}
.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:24px;padding:22px 0 34px}
@media(max-width:960px){.hero{grid-template-columns:1fr}}
.headline{margin:2px 0 10px;font-weight:800;font-size:clamp(22px,2.4vw,32px);line-height:1.25}
.headline .dot{color:var(--brand)}
.lead{margin:0 0 16px;color:var(--muted)}
.cta-row{display:flex;gap:10px;flex-wrap:wrap;margin:8px 0 10px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  height:40px;padding:0 16px;border-radius:12px;border:1px solid var(--border);
  text-decoration:none;font-weight:600;letter-spacing:.2px;color:var(--text);background:var(--card);
}
.btn-primary{
  color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand-2));
  border-color:transparent;box-shadow:0 8px 18px color-mix(in oklab, var(--brand) 30%, transparent);
}
.btn-ghost:hover{background:color-mix(in oklab, var(--card) 86%, var(--bg))}
.social{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0 6px}
.social a{display:inline-flex;align-items:center;gap:8px;padding:6px 10px;border-radius:999px;border:1px solid var(--border);text-decoration:none;color:var(--text);background:var(--card)}
.social a:hover{background:color-mix(in oklab, var(--card) 90%, var(--bg))}
.social img{width:18px;height:18px;display:inline-block}
.video-wrap{aspect-ratio:16/9;border-radius:12px;overflow:hidden}
.video-wrap iframe{width:100%;height:100%;border:0;display:block}

/* 3 功能卡 */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:8px 0 40px}
@media(max-width:900px){.cards{grid-template-columns:1fr}}
.mini-card{
  display:block;position:relative;padding:16px 16px 18px;border-radius:14px;
  background:var(--card);border:1px solid var(--border);box-shadow:var(--shadow);
  color:inherit;text-decoration:none;transition:transform .18s ease, box-shadow .18s ease;
}
.mini-card:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(0,0,0,.15)}
.mini-card h3{margin:2px 0 6px;font-size:17px}
.mini-card p{margin:0;color:var(--muted)}
.mini-card .arrow{position:absolute;right:14px;bottom:12px;color:var(--brand);font-weight:700}

/* ===== 顶部 Slider：宽度=容器100%，比例 1920×667 ===== */
.slider{padding:16px 0 10px} /* 仅负责上下间距，不使用两栏栅格 */
.hero-slider{
  position:relative;border-radius:var(--radius);overflow:hidden;background:#000;
  border:1px solid var(--border);box-shadow:var(--shadow);
  width:100%;
}
.hero-slider .slides{display:flex;transition:transform .5s ease;will-change:transform}
.hero-slider .slide{min-width:100%}
.hero-slider .slide img{
  width:100%;height:auto;
  aspect-ratio:1920/667;       /* 关键：固定默认比例，自适应 */
  object-fit:cover;             /* 宽高比不一致时优雅裁切 */
  display:block;background:#000;
}

/* 覆盖标题 —— 天蓝色半透明，更小的体积 */
.hero-title{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  margin:0;font-weight:800;letter-spacing:.3px;text-align:center;
  font-size:clamp(20px,2.6vw,34px);
  color:#fff;text-shadow:0 2px 6px rgba(0,0,0,.35);
  background:rgba(56,189,248,.58);  /* 天蓝 + 半透明 */
  padding:.28em .8em;               /* 缩小背景体积 */
  border-radius:12px;
  pointer-events:none;
}

/* 控件与圆点 */
.carousel-btn{
  position:absolute;top:50%;transform:translateY(-50%);
  width:36px;height:36px;border-radius:999px;border:1px solid var(--border);
  background:color-mix(in oklab, var(--card) 90%, transparent); color:var(--text);
  display:flex;align-items:center;justify-content:center;cursor:pointer
}
.carousel-btn:hover{background:var(--card)}
.carousel-btn.prev{left:10px}
.carousel-btn.next{right:10px}
.hero-dots{position:absolute;left:0;right:0;bottom:10px;display:flex;gap:8px;justify-content:center}
.hero-dots .dot{
  width:8px;height:8px;border-radius:999px;border:1px solid var(--border);
  background:color-mix(in oklab, var(--card) 70%, transparent);padding:0;cursor:pointer
}
.hero-dots .dot.active{background:color-mix(in oklab, var(--sky) 70%, var(--card))}

/* Footer */
.site-footer{border-top:1px solid var(--border);background:var(--card)}
.footer-row{display:flex;align-items:center;justify-content:space-between;padding:14px 0;color:var(--muted);font-size:14px;flex-wrap:wrap;gap:10px}
.footer-links{display:flex;gap:14px}
.footer-links a{color:inherit;text-decoration:none}
.footer-links a:hover{text-decoration:underline}