/* ============================================================
   Apex Education 登峰教育 — site styles
   Mobile-first, responsive 320px → widescreen.
   Palette: Ivy navy · antique gold · ivory
   ============================================================ */

:root{
  --navy:#1C2B45; --navy-deep:#14203A; --navy-soft:#26395C;
  --gold:#B08A4F; --gold-soft:#D9C29A; --gold-ink:#8a6a34;
  --ivory:#F7F4EE; --card:#FFFFFF; --ink:#23262D; --muted:#6E7280;
  --line:#E7E1D6; --line-soft:#EFEAE0;

  --wrap:1120px;
  --pad:clamp(24px, 5vw, 64px);
  --radius:18px;

  --sans:-apple-system,"PingFang SC","Noto Sans CJK SC","Segoe UI","Microsoft YaHei",sans-serif;
  --serif:Georgia,"Times New Roman","Songti SC","Noto Serif CJK SC",serif;

  --shadow:0 8rpx 30px rgba(28,43,69,.08);
}

*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  font-family:var(--sans); background:var(--ivory); color:var(--ink);
  font-size:16px; line-height:1.65; overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
.serif{font-family:var(--serif);}

/* ---------- language visibility ---------- */
:root[data-lang="cn"] .en-only{display:none!important;}
:root[data-lang="en"] .cn-only{display:none!important;}

/* ---------- layout ---------- */
.wrap{max-width:var(--wrap);margin:0 auto;padding-left:var(--pad);padding-right:var(--pad);}
.section{padding:clamp(56px,9vw,110px) 0;}
.section-tight{padding:clamp(40px,6vw,72px) 0;}

.eyebrow{
  font-size:12px;letter-spacing:3.5px;color:var(--gold);font-weight:700;
  text-transform:uppercase;margin-bottom:14px;
}
.h1{font-size:clamp(34px,7vw,64px);font-weight:800;line-height:1.12;letter-spacing:.5px;color:var(--navy);}
.h2{font-size:clamp(26px,4.6vw,40px);font-weight:800;line-height:1.2;color:var(--navy);letter-spacing:.3px;}
.h3{font-size:clamp(19px,2.6vw,24px);font-weight:700;color:var(--navy);}
.lead{font-size:clamp(17px,2.3vw,21px);color:var(--muted);line-height:1.7;}
.prose{font-size:17px;color:var(--ink);line-height:1.8;}
.prose + .prose{margin-top:18px;}

/* summit rule — signature motif: a short gold line topped by a small upward peak */
.summit{display:flex;align-items:center;gap:6px;margin-top:18px;}
.summit::before{content:"";height:3px;width:52px;background:var(--gold);border-radius:2px;}
.summit::after{content:"";width:0;height:0;
  border-left:6px solid transparent;border-right:6px solid transparent;
  border-bottom:9px solid var(--gold);}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-size:16px;font-weight:700;padding:15px 30px;border-radius:999px;
  border:2px solid transparent;cursor:pointer;transition:transform .15s ease,box-shadow .2s ease,background .2s;
  min-height:52px;
}
.btn:active{transform:scale(.97);}
.btn-gold{background:var(--gold);color:#fff;}
.btn-gold:hover{box-shadow:0 8px 24px rgba(176,138,79,.35);}
.btn-navy{background:var(--navy);color:#fff;}
.btn-navy:hover{box-shadow:0 8px 24px rgba(28,43,69,.28);}
.btn-ghost{background:transparent;color:var(--navy);border-color:var(--navy);}
.btn-ghost:hover{background:var(--navy);color:#fff;}
.btn-ghost-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.55);}
.btn-ghost-light:hover{background:#fff;color:var(--navy);border-color:#fff;}

/* ---------- header / nav ---------- */
.nav{
  position:sticky;top:0;z-index:100;background:rgba(247,244,238,.9);
  backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px;}
.brand{display:flex;align-items:center;gap:12px;}
.brand svg{width:38px;height:38px;flex-shrink:0;}
.brand-names{display:flex;flex-direction:column;line-height:1;}
.brand-cn{font-size:20px;font-weight:800;color:var(--navy);letter-spacing:2px;font-family:var(--serif);}
.brand-en{font-size:10px;letter-spacing:2.5px;color:var(--muted);text-transform:uppercase;margin-top:3px;}

.nav-links{display:none;align-items:center;gap:6px;}
.nav-links a{
  padding:10px 16px;font-size:15px;font-weight:600;color:var(--navy);border-radius:999px;
  transition:background .15s,color .15s;
}
.nav-links a:hover{background:rgba(176,138,79,.12);}
.nav-links a.active{color:var(--gold);}

.nav-right{display:flex;align-items:center;gap:10px;}
.lang-toggle{
  display:inline-flex;border:1.5px solid var(--line);border-radius:999px;overflow:hidden;
  background:#fff;font-size:13px;font-weight:700;
}
.lang-toggle button{
  border:none;background:transparent;color:var(--muted);padding:7px 13px;cursor:pointer;
  font-weight:700;font-size:13px;transition:background .15s,color .15s;min-height:36px;
}
.lang-toggle button.on{background:var(--navy);color:#fff;}

.nav-cta{display:none;}
.burger{
  display:inline-flex;flex-direction:column;justify-content:center;gap:5px;width:44px;height:44px;
  border:none;background:transparent;cursor:pointer;padding:10px;
}
.burger span{height:2.5px;background:var(--navy);border-radius:2px;transition:transform .25s,opacity .2s;}
.burger.open span:nth-child(1){transform:translateY(7.5px) rotate(45deg);}
.burger.open span:nth-child(2){opacity:0;}
.burger.open span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg);}

/* mobile drawer */
.drawer{
  position:fixed;inset:68px 0 auto 0;background:var(--ivory);border-bottom:1px solid var(--line);
  z-index:99;transform:translateY(-120%);transition:transform .3s cubic-bezier(.4,0,.2,1);
  box-shadow:0 20px 40px rgba(0,0,0,.08);
}
.drawer.open{transform:translateY(0);}
.drawer a{
  display:block;padding:18px var(--pad);font-size:18px;font-weight:600;color:var(--navy);
  border-bottom:1px solid var(--line-soft);
}
.drawer a.active{color:var(--gold);}
.drawer .drawer-cta{padding:20px var(--pad) 28px;}
.drawer .btn{width:100%;}

/* ---------- hero ---------- */
.hero{
  position:relative;overflow:hidden;color:#fff;
  background:linear-gradient(158deg,var(--navy-deep) 0%,var(--navy) 55%,var(--navy-soft) 100%);
}
.hero-rings{position:absolute;inset:0;overflow:hidden;pointer-events:none;}
.hero-rings span{position:absolute;border:1.5px solid rgba(176,138,79,.28);border-radius:50%;}
.hero-rings span:nth-child(1){width:min(60vw,460px);aspect-ratio:1;right:-14%;top:-16%;}
.hero-rings span:nth-child(2){width:min(60vw,460px);aspect-ratio:1;right:-6%;top:-8%;border-color:rgba(176,138,79,.15);}
.hero-inner{position:relative;z-index:2;padding-top:clamp(56px,11vw,120px);padding-bottom:clamp(52px,9vw,96px);}
.hero .eyebrow{color:var(--gold-soft);}
.hero h1{color:#fff;}
.hero-en-title{color:rgba(255,255,255,.5);font-size:13px;letter-spacing:3px;text-transform:uppercase;margin-top:12px;}
.hero-sub{color:rgba(255,255,255,.85);font-size:clamp(16px,2.4vw,20px);margin-top:22px;max-width:60ch;line-height:1.7;}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px;}
.hero-tag{font-size:13px;color:var(--gold-soft);border:1px solid rgba(217,194,154,.5);border-radius:999px;padding:6px 15px;}
.hero-btns{display:flex;flex-wrap:wrap;gap:14px;margin-top:36px;}

/* ---------- cards ---------- */
.grid{display:grid;gap:20px;grid-template-columns:1fr;}
.grid > *{min-width:0;}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:clamp(24px,4vw,34px);box-shadow:0 6px 22px rgba(28,43,69,.05);
}
.card-hover{transition:transform .2s ease,box-shadow .2s ease,border-color .2s;}
.card-hover:hover{transform:translateY(-3px);box-shadow:0 16px 40px rgba(28,43,69,.1);border-color:var(--gold-soft);}

/* number chip */
.chip{
  width:52px;height:52px;border-radius:14px;background:var(--navy);color:var(--gold-soft);
  display:flex;align-items:center;justify-content:center;font-family:var(--serif);font-size:22px;
  font-weight:700;flex-shrink:0;
}
.chip-round{
  width:56px;height:56px;border-radius:50%;background:rgba(176,138,79,.12);
  border:1px solid rgba(176,138,79,.4);color:var(--gold);
  display:flex;align-items:center;justify-content:center;font-family:var(--serif);font-size:22px;font-weight:700;flex-shrink:0;
}

/* list items */
.li{display:flex;gap:14px;align-items:flex-start;margin-top:12px;}
.li::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--gold);margin-top:10px;flex-shrink:0;}

/* tag pills */
.pill{display:inline-block;font-size:13px;color:var(--navy);background:rgba(176,138,79,.12);
  border:1px solid rgba(176,138,79,.35);border-radius:999px;padding:5px 14px;margin:6px 8px 0 0;}

/* ---------- footer ---------- */
.footer{background:var(--navy-deep);color:rgba(255,255,255,.8);}
.footer-inner{display:grid;gap:32px;padding-top:clamp(44px,7vw,72px);padding-bottom:32px;}
.footer .brand-cn{color:#fff;}
.footer .brand-en{color:var(--gold-soft);}
.footer-col h4{color:#fff;font-size:15px;font-weight:700;letter-spacing:1px;margin-bottom:14px;}
.footer-col a,.footer-col p{color:rgba(255,255,255,.7);font-size:15px;line-height:2;}
.footer-col a:hover{color:var(--gold-soft);}
.footer-qr-col{display:flex;align-items:flex-start;}
.footer-qr-col img{width:120px;height:120px;border-radius:10px;background:#fff;padding:6px;}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:22px 0;font-size:13px;color:rgba(255,255,255,.5);
  display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between;}

/* ---------- reveal on scroll ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease;}
.reveal.in{opacity:1;transform:none;}

/* ============================================================
   HERO — centered content (all screen sizes)
   ============================================================ */
.hero-inner{text-align:center;}
.hero-sub{margin-left:auto;margin-right:auto;}
.hero-tags,.hero-btns{justify-content:center;}

/* top navy header band on Services / About / Contact — centered */
.page-hero{text-align:center;}
.page-hero .hero-sub{margin-left:auto;margin-right:auto;}

/* ============================================================
   RESPONSIVE — tablet & up
   ============================================================ */
@media(min-width:720px){
  .grid-2{grid-template-columns:1fr 1fr;}
  .grid-3{grid-template-columns:repeat(3,1fr);}
  .footer-inner{grid-template-columns:1.6fr 1fr auto 1.2fr;gap:40px;align-items:start;}
  .footer-qr-col{justify-content:flex-start;}
}
@media(min-width:940px){
  .nav-links{display:flex;}
  .nav-cta{display:inline-flex;}
  .burger{display:none;}
  .drawer{display:none;}
}

/* ---------- accessibility ---------- */
:focus-visible{outline:3px solid var(--gold);outline-offset:2px;border-radius:4px;}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important;}
  .reveal{opacity:1;transform:none;}
}