:root{
  --bg:#0b0b0d;
  --fg:#f2f2f4;
  --muted:#a9a9b2;
}

*{box-sizing:border-box}
html,body{height:100%}

body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Liberation Sans", sans-serif;
  background:var(--bg);
  color:var(--fg);
}

a{color:var(--fg); text-decoration:none}
a:hover{text-decoration:underline}

.wrap{min-height:100vh}

.page{
  position:relative;
  min-height:100vh;
  overflow:hidden;
  display:flex;
  flex-direction:column;
}

.page::before{
  content:"";
  position:absolute;
  inset:0;
  background: url("../assets/formula-bg.jpg") center/cover no-repeat;
  filter: brightness(0.78) contrast(1.12) saturate(0.75);
  transform: scale(1.01);
  z-index:0;
  will-change: transform;
}

@keyframes formulaBreath{
  0%{transform:scale(1.01)}
  100%{transform:scale(1.03)}
}

.page::before{animation:formulaBreath 70s ease-in-out infinite alternate}

@media (prefers-reduced-motion: reduce){.page::before{animation:none}}

.page::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(90deg,rgba(11,11,13,.92) 0%,rgba(11,11,13,.75) 32%,rgba(11,11,13,.42) 58%,rgba(11,11,13,.18) 80%,rgba(11,11,13,.06) 100%);
  z-index:1;
}

.site-header{position:relative;z-index:2;padding:22px 44px 0;text-align:right}
.site-header .brand{margin:0 0 6px;letter-spacing:.22em;text-transform:uppercase;font-size:14px;font-weight:600;opacity:.92}
.site-header .menu{font-size:13px;color:var(--muted)}
.site-header .menu a{color:var(--muted);margin:0 10px}
.site-header .menu a:first-child{margin-left:0}
.site-header .menu a:last-child{margin-right:0}
.site-header .menu a:hover{color:var(--fg);text-decoration:none}

.main{position:relative;z-index:2;flex:1;display:flex;align-items:center}
.container{width:100%;max-width:1100px;padding:28px 44px 56px}
.h1{margin:0 0 10px;font-size:22px;font-weight:600}
.lead{margin:0 0 16px;line-height:1.25;color:var(--muted);max-width:74ch}

.list{margin-top:14px;border:1px solid rgba(242,242,244,.14);border-radius:16px;background:rgba(0,0,0,.14);backdrop-filter:blur(3px);overflow:hidden}
.list-header{padding:14px 16px;border-bottom:1px solid rgba(242,242,244,.10);display:flex;align-items:baseline;justify-content:space-between;gap:12px}
.inline-header{margin-top:18px;border:1px solid rgba(242,242,244,.12);border-radius:16px;background:rgba(0,0,0,.14);backdrop-filter:blur(3px)}
.list-header h2{margin:0;font-size:16px;font-weight:600}
.list-header .note{margin:0;font-size:12px;color:var(--muted);white-space:nowrap}
.items{list-style:none;margin:0;padding:0}
.item{padding:14px 16px;display:flex;justify-content:space-between;align-items:flex-start;gap:14px;border-top:1px solid rgba(242,242,244,.08)}
.item:first-child{border-top:none}
.item a{display:inline-block;font-size:14px;font-weight:600;line-height:1.25}
.item .meta{margin-top:6px;font-size:12px;color:var(--muted);line-height:1.25}

.formula-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:14px;align-items:stretch}
.formula-card{min-height:148px;display:flex;flex-direction:column;padding:18px;border:1px solid rgba(242,242,244,.14);border-radius:18px;background:rgba(0,0,0,.22);backdrop-filter:blur(4px);box-shadow:0 18px 40px rgba(0,0,0,.18);transition:border-color .2s ease,background .2s ease}
.formula-card:hover{border-color:rgba(242,242,244,.26);background:rgba(0,0,0,.28)}
.kicker{margin:0 0 10px;font-size:11px;line-height:1.25;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}
.formula-text{margin:0;font-size:16px;line-height:1.34;font-weight:500;color:rgba(242,242,244,.94)}
.formula-tags{margin-top:auto;padding-top:14px;color:var(--muted);font-size:12px;line-height:1.25;opacity:.86}
.line-button{display:inline-block;clear:both;margin-top:34px;position:relative;z-index:4;border:1px solid rgba(242,242,244,.18);border-radius:999px;padding:8px 14px;background:rgba(255,255,255,.04);color:var(--muted);font:inherit;font-size:13px;cursor:pointer;text-decoration:none;opacity:.86}
.line-button:hover{text-decoration:none;color:var(--fg);border-color:rgba(242,242,244,.34);background:rgba(255,255,255,.08);opacity:.94}
.formula-grid+.line-button,.list+.line-button{margin-top:32px}

.badge{font-size:12px;color:var(--muted);border:1px solid rgba(242,242,244,.14);border-radius:999px;padding:6px 10px;white-space:nowrap;background:rgba(255,255,255,.03);opacity:.82}
.seal{display:flex;align-items:center;gap:10px;margin-top:18px;color:var(--muted);font-size:12px}
.seal img{height:22px;width:auto;opacity:.75}

@media (max-width:980px){.formula-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:900px){.site-header{padding:16px 22px 0}.main{align-items:flex-start}.container{padding:22px 22px 44px}.list-header .note{display:none}.item{flex-direction:column;align-items:flex-start}}
@media (max-width:640px){.formula-grid{grid-template-columns:1fr}.formula-card{min-height:132px}.formula-text{font-size:15px;line-height:1.34}.line-button{margin-top:34px}}