:root {
  --brand: #50C878;
  --brand-deep: #1B6B47;
  --brand-soft: #D8F0E4;
  --ink: #14201A;
  --muted: #5B6B62;
  --line: rgba(20, 32, 26, 0.1);
  --surface: rgba(255, 255, 255, 0.78);
  --bg0: #E8F4EC;
  --bg1: #F4FAF6;
  --warn-bg: #FFF6EB;
  --warn-ink: #8A4B12;
  --radius: 20px;
  --shadow: 0 18px 50px rgba(27, 107, 71, 0.08);
  --max: 1080px;
  --logo-green: #50C878;
  --logo-amber: #E8A54B;
  --logo-coral: #E07A5F;
  --logo-graphite: #26312D;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  font-family: Manrope, sans-serif;
  background:
    radial-gradient(900px 480px at 12% -10%, rgba(47, 158, 107, 0.22), transparent 60%),
    radial-gradient(700px 420px at 100% 8%, rgba(47, 158, 107, 0.12), transparent 55%),
    linear-gradient(180deg, var(--bg0), var(--bg1) 28%, #F7FBF8 100%);
  min-height: 100vh;
}

a { color: var(--brand-deep); }
a:hover { color: var(--brand); }

.wrap {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
}

header.top {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(244, 250, 246, 0.82);
  border-bottom: 1px solid var(--line);
}

.top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  font-family: Sora, sans-serif;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 8px 18px rgba(47, 158, 107, 0.22);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  justify-content: flex-end;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
  font-weight: 650;
  font-size: 0.92rem;
}

.nav a.active {
  color: var(--brand-deep);
}

.hero {
  padding: 36px 0 10px;
  animation: rise 0.7s ease both;
}

.hero-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 8px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-deep);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h1 {
  margin: 12px 0 10px;
  font-family: Sora, sans-serif;
  font-size: clamp(1.7rem, 4vw, 2.55rem);
  line-height: 1.12;
  letter-spacing: -0.035em;
}

.lede {
  margin: 0;
  max-width: 42rem;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.65;
}

.muted {
  color: var(--muted);
  font-size: 0.92rem;
}

.layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 28px;
  align-items: start;
  padding: 24px 0 56px;
}

.toc {
  position: sticky;
  top: 78px;
  padding: 16px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  animation: rise 0.75s ease 0.05s both;
}

.toc h2 {
  margin: 0 0 10px;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 800;
}

.toc a {
  display: block;
  text-decoration: none;
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 7px 8px;
  border-radius: 10px;
  line-height: 1.35;
}

.toc a:hover {
  background: var(--brand-soft);
  color: var(--brand-deep);
}

.content {
  display: grid;
  gap: 18px;
}

section.panel {
  scroll-margin-top: 88px;
  padding: 24px 24px 22px;
  border-radius: calc(var(--radius) + 4px);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  animation: rise 0.75s ease both;
}

.panel h2 {
  margin: 0 0 10px;
  font-family: Sora, sans-serif;
  font-size: 1.22rem;
  letter-spacing: -0.02em;
}

.panel h3 {
  margin: 20px 0 8px;
  font-family: Sora, sans-serif;
  font-size: 1.02rem;
}

.panel p,
.panel li {
  color: var(--muted);
  line-height: 1.65;
  font-size: 0.98rem;
}

.panel p { margin: 0 0 12px; }
.panel p:last-child,
.panel ul:last-child { margin-bottom: 0; }

.panel ul {
  margin: 0 0 12px;
  padding-left: 1.15rem;
}

.panel li { margin: 0 0 8px; }
.panel li strong { color: var(--ink); }

.formula {
  margin: 14px 0;
  padding: 14px 16px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(47, 158, 107, 0.1), rgba(255, 255, 255, 0.55));
  border: 1px solid rgba(47, 158, 107, 0.22);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92rem;
  color: var(--brand-deep);
  font-weight: 650;
  line-height: 1.55;
  overflow-x: auto;
}

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-top: 14px;
}

.mini {
  padding: 14px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
}

.mini strong {
  display: block;
  margin-bottom: 6px;
  font-family: Sora, sans-serif;
  font-size: 0.95rem;
  color: var(--ink);
}

.mini span {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.5;
}

.note {
  margin-top: 14px;
  padding: 14px 16px;
  border-radius: 14px;
  background: var(--warn-bg);
  border: 1px solid #F3D5A8;
  color: var(--warn-ink);
  font-size: 0.92rem;
  line-height: 1.55;
}

.contact a { font-weight: 700; text-decoration: none; }

footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: 0.9rem;
}

footer .row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  justify-content: space-between;
  align-items: center;
}

footer a { font-weight: 650; text-decoration: none; }

/* Splash-matched logo animation */
.logo-stage {
  width: 118px;
  height: 118px;
  position: relative;
  display: grid;
  place-items: center;
  opacity: 0;
  transform: scale(0.72) translateY(6px);
  animation:
    logoIntro 1.3s cubic-bezier(0.22, 1, 0.36, 1) 0.05s forwards,
    logoFloat 2.4s ease-in-out 1.35s infinite;
}

.logo-halo {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background:
    conic-gradient(
      from -130deg,
      var(--logo-green) 0 46%,
      transparent 46% 56%,
      var(--logo-amber) 56% 74%,
      transparent 74% 80%,
      var(--logo-coral) 80% 92%,
      transparent 92% 100%
    );
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 5px), #000 calc(100% - 4px));
  mask: radial-gradient(farthest-side, transparent calc(100% - 5px), #000 calc(100% - 4px));
  opacity: 0.85;
  animation: haloSpin 2.4s ease-in-out 1.35s infinite;
}

.logo-badge {
  position: relative;
  z-index: 1;
  width: 76px;
  height: 76px;
  padding: 5px;
  border-radius: 19px;
  background: #FFFCF8;
  border: 1.4px solid rgba(255, 255, 255, 0.82);
  box-shadow:
    0 18px 34px -8px rgba(38, 49, 45, 0.15),
    0 0 28px -10px rgba(47, 158, 107, 0.18);
}

.logo-badge img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 16px;
  display: block;
}

@keyframes logoIntro {
  0% { opacity: 0; transform: scale(0.72) translateY(8px); }
  72% { opacity: 1; transform: scale(1.035) translateY(0); }
  100% { opacity: 1; transform: scale(1) translateY(0); }
}

@keyframes logoFloat {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-3.5px) scale(1.012); }
}

@keyframes haloSpin {
  0%, 100% { transform: rotate(-2.5deg); }
  50% { transform: rotate(2.5deg); }
}

@keyframes rise {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .toc { position: static; display: none; }
  .hero-brand { align-items: center; text-align: center; }
  .hero .lede { margin-left: auto; margin-right: auto; }
  h1 { text-align: center; }
  .eyebrow { margin-left: auto; margin-right: auto; }
}