:root {
  --bg:      #060914;
  --bg-2:    #0A1024;
  --ink:     #EAF0FF;
  --ink-2:   #A5B4D8;
  --ink-3:   #6B7AA0;
  --blue:    #4A78FF;
  --blue-2:  #6E9CFF;
  --purple:  #8B5CF6;
  --violet:  #A78BFA;
  --gold:    #FFC24D;
  --line:    rgba(120,150,255,.16);
  --font: "Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --wrap: 1180px;
  --ease: cubic-bezier(.22,.75,.24,1);
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; font-family: var(--font); color: var(--ink);
  background: var(--bg); line-height: 1.8; font-size: 16px;
  overflow-x: hidden; -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 28px; }

/* 背景层 */
#particles { position: fixed; inset: 0; width: 100%; height: 100%; z-index: 0; pointer-events: none; }
.bg-layer {
  position: fixed; inset: 0; z-index: -2;
  background-image: url(images/bg.png);
  background-size: cover; background-position: center;
  opacity: .55;
}
.bg-glow {
  position: fixed; inset: 0; z-index: -1;
  background:
    radial-gradient(ellipse 900px 600px at 18% 22%, rgba(74,120,255,.22), transparent 65%),
    radial-gradient(ellipse 800px 600px at 85% 78%, rgba(139,92,246,.2), transparent 65%),
    linear-gradient(180deg, rgba(6,9,20,.72), rgba(6,9,20,.86));
}

/* NAV */
.nav { position: fixed; inset: 0 0 auto 0; z-index: 50; padding: 14px 0; transition: background .4s var(--ease), padding .4s var(--ease), border-color .4s var(--ease); border-bottom: 1px solid transparent; }
.nav.scrolled { background: rgba(6,9,20,.78); backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px); padding: 9px 0; border-bottom-color: var(--line); }
.nav-inner { max-width: var(--wrap); margin: 0 auto; padding: 0 28px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mascot { width: 40px; height: 40px; object-fit: contain; filter: drop-shadow(0 0 12px rgba(255,194,77,.5)); }
.brand-txt { font-size: 20px; font-weight: 900; letter-spacing: .06em; }
.brand-txt span { color: var(--gold); }
.nav-links { display: flex; gap: 32px; }
.nav-links a { font-size: 14.5px; color: var(--ink-2); position: relative; padding: 4px 0; transition: color .3s var(--ease); }
.nav-links a::after { content: ""; position: absolute; left: 0; bottom: -3px; height: 2px; width: 0; border-radius: 2px; background: linear-gradient(90deg,var(--blue),var(--violet)); transition: width .35s var(--ease); }
.nav-links a:hover { color: #fff; }
.nav-links a:hover::after { width: 100%; }
.nav-cta {
  padding: 10px 24px; border-radius: 999px; font-size: 14px; font-weight: 500;
  background: linear-gradient(135deg, var(--blue), var(--purple)); color: #fff;
  box-shadow: 0 8px 26px -8px rgba(74,120,255,.7);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease);
  white-space: nowrap;
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 14px 32px -8px rgba(74,120,255,.85); }

/* HERO */
.hero { position: relative; z-index: 1; min-height: 100vh; display: flex; align-items: center; padding: 110px 0 60px; }
.hero-inner { max-width: var(--wrap); margin: 0 auto; padding: 0 28px; width: 100%; display: grid; grid-template-columns: 1.15fr .85fr; gap: 40px; align-items: center; }
.eyebrow { display: inline-block; font-size: 12.5px; letter-spacing: .3em; color: var(--blue-2); margin: 0 0 22px; padding: 7px 18px; border-radius: 999px; border: 1px solid rgba(110,156,255,.35); background: rgba(74,120,255,.1); }
.eyebrow.light { color: var(--gold); border-color: rgba(255,194,77,.35); background: rgba(255,194,77,.08); }
.hero-title {
  font-size: clamp(2.6rem, 6.2vw, 4.8rem); line-height: 1.1; margin: 0 0 20px;
  font-weight: 900; letter-spacing: .01em;
}
.hero-title .hl {
  background: linear-gradient(120deg, #fff 0%, var(--gold) 42%, #FFE6A8 60%, var(--gold) 78%, #fff 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 26px rgba(255,194,77,.55));
}
.hero-sub { font-size: clamp(1.2rem, 2.6vw, 1.75rem); font-weight: 500; color: #CFDCFF; margin: 0 0 10px; letter-spacing: .04em; }
.hero-slogan { font-size: clamp(1.05rem, 2.2vw, 1.4rem); font-weight: 700; color: var(--gold); margin: 0 0 34px; text-shadow: 0 0 24px rgba(255,194,77,.4); letter-spacing: .08em; }

.hero-meta { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 32px; }
.meta-item {
  display: flex; align-items: center; gap: 12px; padding: 14px 20px; border-radius: 14px;
  background: rgba(16,24,52,.62); border: 1px solid var(--line);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
.meta-ico { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 10px; background: rgba(74,120,255,.18); color: var(--blue-2); flex: 0 0 auto; }
.meta-ico svg { width: 19px; height: 19px; }
.meta-item b { display: block; font-size: 15px; color: #fff; line-height: 1.4; }
.meta-item span { font-size: 13px; color: var(--ink-3); }

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 15px 36px; font-size: 15px; font-weight: 500; border-radius: 999px; border: 1px solid transparent; cursor: pointer; transition: transform .25s var(--ease), box-shadow .3s var(--ease), background .3s var(--ease), border-color .3s var(--ease); }
.btn-primary { background: linear-gradient(135deg, var(--blue), var(--purple)); color: #fff; box-shadow: 0 12px 34px -12px rgba(74,120,255,.8); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 20px 44px -12px rgba(74,120,255,.95); }
.btn-ghost { border-color: rgba(150,175,255,.4); color: #D6E1FF; background: rgba(255,255,255,.03); }
.btn-ghost:hover { border-color: var(--blue-2); background: rgba(74,120,255,.12); transform: translateY(-2px); }
.btn-lg { padding: 17px 44px; font-size: 16px; }

/* 娃娃 */
.hero-mascot { position: relative; display: flex; flex-direction: column; align-items: center; }
.mascot-float { position: relative; animation: floatY 3.6s ease-in-out infinite; cursor: pointer; }
.mascot-float img { width: 100%; max-width: 380px; filter: drop-shadow(0 24px 50px rgba(255,194,77,.35)); transition: transform .2s var(--ease); }
@keyframes floatY { 0%,100% { transform: translateY(0) rotate(-1.5deg); } 50% { transform: translateY(-18px) rotate(1.5deg); } }
.mascot-halo { position: absolute; inset: 6% 10%; border-radius: 50%; background: radial-gradient(circle, rgba(255,194,77,.3), transparent 62%); filter: blur(34px); z-index: -1; }
.mascot-float.jump { animation: jump .6s var(--ease); }
@keyframes jump { 0%,100%{transform:translateY(0) scale(1);} 30%{transform:translateY(-46px) scale(1.08);} 60%{transform:translateY(0) scale(.96);} 80%{transform:translateY(-14px) scale(1.02);} }
.mascot-tip { margin: 14px 0 0; font-size: 13px; color: var(--ink-3); letter-spacing: .1em; transition: opacity .3s; }
.mascot-bubble {
  position: absolute; top: -8px; left: 50%; transform: translate(-50%, -100%);
  background: #fff; color: #1b2340; font-size: 14px; font-weight: 500;
  padding: 10px 18px; border-radius: 14px; white-space: nowrap;
  box-shadow: 0 10px 30px rgba(0,0,0,.35); opacity: 0; pointer-events: none;
  transition: opacity .25s var(--ease), transform .25s var(--ease);
}
.mascot-bubble::after { content: ""; position: absolute; bottom: -7px; left: 50%; transform: translateX(-50%); border: 7px solid transparent; border-top-color: #fff; }
.mascot-bubble.show { opacity: 1; transform: translate(-50%, -100%) scale(1.02); }

.scroll-hint { position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%); width: 24px; height: 40px; border: 1.5px solid rgba(150,175,255,.4); border-radius: 13px; }
.scroll-hint span { position: absolute; top: 8px; left: 50%; transform: translateX(-50%); width: 4px; height: 8px; border-radius: 2px; background: var(--blue-2); animation: scrollDot 1.8s var(--ease) infinite; }
@keyframes scrollDot { 0%{opacity:0;transform:translate(-50%,0);} 40%{opacity:1;} 100%{opacity:0;transform:translate(-50%,14px);} }

/* SECTION */
.section { position: relative; z-index: 1; padding: 120px 0; }
.sec-head { margin-bottom: 56px; max-width: 720px; }
.sec-title { font-size: clamp(1.8rem, 4vw, 2.9rem); font-weight: 900; line-height: 1.28; margin: 0 0 16px; letter-spacing: .01em; }
.sec-title.light { color: #fff; }
.sec-lead { font-size: 15.5px; color: var(--ink-2); margin: 0; line-height: 1.9; }

/* WHAT cards */
.cards { display: grid; grid-template-columns: repeat(3,1fr); gap: 22px; }
.card {
  position: relative; padding: 40px 30px 34px; border-radius: 18px; overflow: hidden;
  background: linear-gradient(160deg, rgba(22,32,66,.72), rgba(14,20,44,.72));
  border: 1px solid var(--line); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  transition: transform .4s var(--ease), border-color .4s var(--ease), box-shadow .4s var(--ease);
}
.card::before { content: ""; position: absolute; inset: 0; border-radius: inherit; background: radial-gradient(400px 200px at 50% 0%, rgba(110,156,255,.16), transparent 70%); opacity: 0; transition: opacity .4s var(--ease); }
.card:hover { transform: translateY(-8px); border-color: rgba(110,156,255,.45); box-shadow: 0 30px 60px -30px rgba(74,120,255,.55); }
.card:hover::before { opacity: 1; }
.card-num { position: relative; font-size: 13px; font-weight: 700; letter-spacing: .2em; color: var(--blue-2); }
.card h3 { position: relative; font-size: 20px; font-weight: 700; margin: 14px 0 12px; line-height: 1.45; }
.card p { position: relative; margin: 0; font-size: 14.5px; color: var(--ink-2); line-height: 1.85; }

/* WHO */
.who-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
.who-item {
  padding: 26px 26px; border-radius: 14px; background: rgba(16,24,52,.55);
  border: 1px solid var(--line); backdrop-filter: blur(10px);
  transition: transform .3s var(--ease), border-color .3s var(--ease), background .3s var(--ease);
}
.who-item:hover { transform: translateY(-4px); border-color: rgba(167,139,250,.45); background: rgba(30,24,64,.6); }
.who-item b { display: block; font-size: 17px; color: #fff; margin-bottom: 6px; }
.who-item span { font-size: 14px; color: var(--ink-3); }

/* WHEN */
.when { padding-bottom: 140px; }
.when-inner { display: flex; justify-content: center; }
.when-card {
  width: 100%; max-width: 640px; text-align: center; padding: 54px 44px;
  border-radius: 24px;
  background: linear-gradient(160deg, rgba(28,26,72,.82), rgba(14,18,44,.88));
  border: 1px solid rgba(130,120,255,.3);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 40px 90px -40px rgba(74,120,255,.5);
}
.when-rows { margin: 30px 0 34px; display: flex; flex-direction: column; gap: 14px; }
.when-row { display: flex; align-items: center; gap: 16px; text-align: left; padding: 16px 20px; border-radius: 14px; background: rgba(10,14,32,.5); border: 1px solid var(--line); }
.wr-ico { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 12px; background: rgba(74,120,255,.16); color: var(--blue-2); flex: 0 0 auto; }
.wr-ico svg { width: 22px; height: 22px; }
.when-row b { display: block; font-size: 16.5px; color: #fff; }
.when-row span { font-size: 14px; color: var(--ink-3); }

/* FOOT */
.foot { position: relative; z-index: 1; padding: 34px 0; text-align: center; border-top: 1px solid var(--line); }
.foot p { margin: 0; font-size: 13px; color: var(--ink-3); }

/* REVEAL */
.reveal { opacity: 0; transform: translateY(36px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* RESPONSIVE */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; gap: 30px; text-align: center; }
  .hero-meta, .hero-actions { justify-content: center; }
  .hero-mascot { order: -1; }
  .mascot-float img { max-width: 260px; }
  .cards { grid-template-columns: 1fr; }
  .who-grid { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 640px) {
  .wrap, .nav-inner, .hero-inner { padding-left: 20px; padding-right: 20px; }
  .nav-links { display: none; }
  .section { padding: 84px 0; }
  .who-grid { grid-template-columns: 1fr; }
  .when-card { padding: 40px 24px; }
  .hero { padding-top: 96px; }
}
@media (prefers-reduced-motion: reduce) {
  .mascot-float, .scroll-hint span { animation: none !important; }
  * { transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}