@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root{
  --bg:#e9f1f8;
  --bg2:#f8eef3;
  --panel:#eff5fa;
  --ink:#171f26;
  --ink2:#4c5b67;
  --blue:#c8e0f4;
  --pink:#f5e0e8;
  --hi:rgba(255,255,255,.95);
  --lo:rgba(23,31,38,.17);
  --up:-7px -7px 16px var(--hi), 7px 7px 20px var(--lo);
  --in:inset -4px -4px 10px var(--hi), inset 4px 4px 12px var(--lo);
  --tap:44px;
}

*{box-sizing:border-box}

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  min-height:100vh;
  font-family:'Space Grotesk','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  font-size:16.5px;
  line-height:1.66;
  color:var(--ink);
  background:linear-gradient(165deg,#eef5fb 0%,var(--bg) 42%,var(--bg2) 100%);
  background-attachment:fixed;
  overflow-x:clip;
}

a{color:var(--ink);text-decoration:none}

h1,h2,h3{
  margin:0;
  font-weight:700;
  line-height:1.18;
  letter-spacing:.01em;
  text-transform:uppercase;
}

p{margin:0 0 14px}

.skip{
  position:absolute;
  left:14px;
  top:-72px;
  z-index:120;
  padding:12px 18px;
  background:var(--blue);
  border-radius:0 0 12px 12px;
  box-shadow:var(--up);
  font-weight:600;
}
.skip:focus{top:0}

/* ============ top bar ============ */
.bar{
  position:sticky;
  top:0;
  z-index:60;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:10px;
  padding:10px clamp(10px,3vw,32px);
  background:rgba(233,241,248,.88);
  backdrop-filter:blur(10px);
  box-shadow:0 10px 22px rgba(23,31,38,.10);
}

.bar__side{
  display:flex;
  align-items:center;
  gap:6px;
  min-width:0;
}
.bar__side--r{justify-content:flex-end}

.bar__menu{display:flex;gap:2px;min-width:0}

.bar a,.bar button{
  display:inline-flex;
  align-items:center;
  min-height:var(--tap);
  padding:0 12px;
  font-size:16px;
  font-family:inherit;
  color:var(--ink);
  border:0;
  border-radius:14px;
  background:transparent;
  cursor:pointer;
}

.bar__menu a{white-space:nowrap}
.bar__menu a:hover{box-shadow:var(--in)}

.burger{
  gap:9px;
  background:var(--pink) !important;
  box-shadow:var(--up);
  font-weight:600;
}
.burger__ic{
  width:16px;
  height:2px;
  background:var(--ink);
  box-shadow:0 5px 0 var(--ink),0 -5px 0 var(--ink);
  flex:none;
}

.mark{
  font-weight:700;
  font-size:clamp(17px,2.2vw,21px);
  letter-spacing:-.01em;
  padding:0 10px !important;
  white-space:nowrap;
}

.cta{
  background:linear-gradient(145deg,var(--blue),#b6d5ee) !important;
  box-shadow:var(--up);
  font-weight:700;
  border-radius:14px !important;
  white-space:nowrap;
  transition:transform .15s ease, box-shadow .15s ease;
}
.cta:active{box-shadow:var(--in);transform:scale(.97)}

/* ============ veil menu ============ */
.veil{
  position:fixed;
  inset:0;
  z-index:90;
  display:flex;
  flex-direction:column;
  padding:clamp(16px,4vw,42px);
  overflow:auto;
  background:linear-gradient(160deg,#eaf2f9,#f7ebf1);
  box-shadow:var(--in);
  opacity:0;
  visibility:hidden;
  transition:opacity .24s ease, visibility .24s ease;
  counter-reset:vn;
}
.veil.is-open{opacity:1;visibility:visible}

.veil__top{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-bottom:clamp(16px,4vh,42px);
}
.veil__b{font-weight:700;font-size:19px;letter-spacing:.02em}

.veil__x{
  min-height:var(--tap);
  padding:0 18px;
  font:inherit;
  font-weight:600;
  color:var(--ink);
  background:var(--pink);
  border:0;
  border-radius:14px;
  box-shadow:var(--up);
  cursor:pointer;
}
.veil__x:active{box-shadow:var(--in);transform:scale(.97)}

.veil__nav{
  display:grid;
  gap:9px;
  align-content:start;
  max-width:640px;
  width:100%;
}
.veil__nav a{
  counter-increment:vn;
  display:flex;
  align-items:center;
  gap:14px;
  min-height:54px;
  padding:0 16px;
  font-size:clamp(17px,3.2vw,23px);
  font-weight:700;
  text-transform:uppercase;
  background:#eaf2f9;
  border-radius:14px;
  box-shadow:var(--up);
  transition:transform .15s ease, box-shadow .15s ease;
}
.veil__nav a::before{
  content:counter(vn,decimal-leading-zero);
  font-size:13px;
  letter-spacing:.14em;
  color:var(--ink2);
}
.veil__nav a:active{box-shadow:var(--in);transform:scale(.99)}

body.lock{overflow:hidden}

/* ============ hero ============ */
.hero{
  display:grid;
  grid-template-columns:minmax(0,.86fr) minmax(0,1.14fr);
  align-items:center;
  gap:clamp(16px,3vw,42px);
  min-height:45vh;
  padding:clamp(20px,4vw,46px) clamp(16px,4vw,48px);
  background-image:
    linear-gradient(rgba(23,31,38,.062) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23,31,38,.062) 1px, transparent 1px);
  background-size:34px 34px;
  background-position:center;
}

.hero__txt{text-align:center}

.hero h1{
  font-size:clamp(30px,5.2vw,58px);
  letter-spacing:-.012em;
  line-height:1.08;
}

.hero__desc{
  margin:14px auto 0;
  max-width:36ch;
  color:var(--ink2);
  font-size:17px;
}

.hero__media{
  display:flex;
  min-height:230px;
  padding:0;
  background:linear-gradient(150deg,var(--pink),var(--blue));
  box-shadow:var(--up);
}

.hero__img,
.hero__ph{
  display:block;
  width:100%;
  height:100%;
  min-height:230px;
  object-fit:cover;
}
.hero__ph{background:linear-gradient(145deg,var(--pink),var(--blue) 72%);box-shadow:var(--in)}

/* ============ layout shell ============ */
.wrap{
  display:grid;
  grid-template-columns:236px minmax(0,1fr);
  align-items:start;
  gap:clamp(18px,3vw,36px);
  max-width:1180px;
  margin:0 auto;
  padding:clamp(26px,4vw,50px) clamp(14px,3vw,28px) 64px;
}

div[id]{scroll-margin-top:96px}

/* ============ aside ============ */
.side{
  position:sticky;
  top:88px;
  align-self:start;
  padding:16px 14px 18px;
  background:var(--bg2);
  box-shadow:var(--up);
}

.side__h{
  display:flex;
  align-items:center;
  gap:9px;
  margin:0 0 12px;
  font-size:15px;
  letter-spacing:.16em;
}
.side__h--2{margin-top:22px}

.mk{
  width:9px;
  height:9px;
  flex:none;
  background:var(--ink);
}

.side__nav ol{list-style:none;margin:0;padding:0}

.side__nav a{
  display:flex;
  align-items:center;
  min-height:42px;
  padding:0 10px;
  font-size:16px;
  border-radius:12px;
}
.side__nav a:hover{box-shadow:var(--in)}

.top-btn{
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:var(--tap);
  background:var(--blue);
  border-radius:12px;
  box-shadow:var(--up);
  font-weight:600;
  font-size:16px;
  transition:transform .15s ease;
}
.top-btn:active{box-shadow:var(--in);transform:scale(.98)}

/* ============ article ============ */
.doc{min-width:0}

.doc__body{
  padding:clamp(18px,3.4vw,40px);
  background:var(--panel);
  box-shadow:var(--up);
}

.doc__body > div + div{
  margin-top:38px;
  padding-top:38px;
  box-shadow:0 -1px 0 rgba(23,31,38,.1);
}

.doc__body h2{
  position:relative;
  margin:0 0 14px;
  padding-left:18px;
  font-size:clamp(21px,2.5vw,29px);
}
.doc__body h2::before{
  content:'';
  position:absolute;
  left:0;
  top:.34em;
  width:9px;
  height:9px;
  background:var(--ink);
}

.doc__body h3{
  margin:24px 0 10px;
  font-size:19px;
}

.doc__body ul,
.doc__body ol{margin:0 0 16px;padding-left:1.3em}
.doc__body li{margin:0 0 8px}

.doc__body a{box-shadow:inset 0 -1px 0 rgba(23,31,38,.38)}
.doc__body a:hover{box-shadow:inset 0 -1px 0 var(--ink)}

.doc__body blockquote{
  margin:20px 0;
  padding:16px 18px;
  background:var(--bg2);
  box-shadow:var(--in);
}

.doc__body img{display:block;max-width:100%;height:auto}

.doc__body table{width:100%;border-collapse:collapse;font-size:16px}
.doc__body th,
.doc__body td{padding:10px 8px;text-align:left;box-shadow:inset 0 -1px 0 rgba(23,31,38,.12)}
.doc__body th{font-weight:700}

.doc__body hr{border:0;height:1px;background:rgba(23,31,38,.14);margin:26px 0}

/* ============ footer ============ */
.foot{
  margin-top:24px;
  padding:clamp(28px,5vw,58px) clamp(16px,4vw,48px) 0;
  background:linear-gradient(170deg,#dfeaf4,#f1e3eb);
  box-shadow:inset 0 12px 26px rgba(23,31,38,.12);
}

.foot__big{
  margin:0 0 clamp(20px,3vw,36px);
  max-width:1180px;
  margin-left:auto;
  margin-right:auto;
  font-size:clamp(33px,9.4vw,88px);
  font-weight:700;
  line-height:.94;
  letter-spacing:-.025em;
  text-transform:uppercase;
  word-break:break-word;
}

.foot__cols{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:22px;
  max-width:1180px;
  margin:0 auto;
}

.foot dl{margin:0}

.foot dt{
  margin:0 0 8px;
  font-size:15px;
  letter-spacing:.13em;
  color:var(--ink2);
}
.foot dd{margin:0 0 6px;font-size:16px}

.foot__nav dt a,
.foot__nav dd a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
}
.foot__nav a:hover{box-shadow:inset 0 -1px 0 var(--ink)}

.foot__bar{
  max-width:1180px;
  margin:clamp(22px,4vw,38px) auto 0;
  padding:16px 0 24px;
  text-align:center;
  box-shadow:0 -1px 0 rgba(23,31,38,.14);
}
.foot__bar p{margin:0;font-size:15px;color:var(--ink2)}

/* ============ reveal ============ */
.rv{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .55s ease, transform .55s ease;
}
.rv.is-in{opacity:1;transform:none}

/* ============ responsive ============ */
@media (max-width:900px){
  .bar__menu{display:none}
  .bar{grid-template-columns:1fr auto 1fr}
  .wrap{grid-template-columns:minmax(0,1fr)}
  .side{position:static;order:2}
  .doc{order:1}
  .foot__cols{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:760px){
  .hero{
    grid-template-columns:minmax(0,1fr);
    min-height:0;
    padding:16px clamp(14px,4vw,24px) clamp(24px,5vw,34px);
    gap:18px;
  }
  .hero__media{min-height:150px;max-height:190px;order:-1}
  .hero__img,.hero__ph{min-height:150px;max-height:190px}
  .hero__desc{font-size:16px}
}

@media (max-width:480px){
  .bar{padding:8px 10px;gap:6px}
  .bar a,.bar button{padding:0 9px;font-size:16px}
  .mark{padding:0 4px !important;font-size:16px}
  .burger__tx{display:none}
  .foot__cols{grid-template-columns:minmax(0,1fr);gap:16px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .rv{opacity:1;transform:none;transition:none}
  .cta,.top-btn,.veil__nav a{transition:none}
}

button[aria-expanded]{min-width:44px;min-height:44px}