:root {
  --paper: #f7f8fb;
  --paper-2: #eef0f5;
  --paper-3: #e2e5ef;
  --ink: #1e2130;
  --ink-2: #3d425a;
  --ink-3: #6b708a;
  --rule: rgba(30, 33, 48, 0.1);
  --rule-soft: rgba(30, 33, 48, 0.06);
  --indigo: #4f52b3;
  --indigo-deep: #35378f;
  --fog: #8e94c1;
  --green: #4a7c59;
  --green-soft: rgba(74, 124, 89, 0.14);
  --amber: #b8862d;
  --amber-soft: rgba(184, 134, 45, 0.14);
  --shadow: 0 24px 70px rgba(30, 33, 48, 0.18);
  --shadow-soft: 0 10px 30px rgba(30, 33, 48, 0.08);
  --glass: rgba(255, 255, 255, 0.62);
  --glass-strong: rgba(255, 255, 255, 0.82);
  --font: "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", "SF Mono", Consolas, ui-monospace, monospace;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--paper); }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 18% 16%, rgba(79, 82, 179, 0.14), transparent 26rem),
    radial-gradient(circle at 82% 6%, rgba(142, 148, 193, 0.16), transparent 24rem),
    radial-gradient(circle at 64% 88%, rgba(74, 124, 89, 0.08), transparent 22rem),
    var(--paper);
  color: var(--ink);
  font-family: var(--font);
  letter-spacing: -0.005em;
  text-rendering: optimizeLegibility;
}

body.panel-open { overflow: hidden; }
a { color: inherit; }
img, video { max-width: 100%; }
button, a { -webkit-tap-highlight-color: transparent; }

.skip-link {
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 50;
  transform: translateY(-160%);
  background: var(--indigo);
  color: var(--paper-2);
  padding: 0.75rem 1rem;
  border-radius: 999px;
  font-weight: 800;
}
.skip-link:focus { transform: translateY(0); }

.surface {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 0;
  opacity: 0.42;
  background:
    radial-gradient(circle at 14% 22%, rgba(79, 82, 179, 0.22), transparent 28rem),
    radial-gradient(circle at 80% 12%, rgba(142, 148, 193, 0.26), transparent 26rem),
    radial-gradient(circle at 50% 86%, rgba(74, 124, 89, 0.18), transparent 24rem);
  filter: blur(60px);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1rem, 4vw, 3.5rem);
  border-bottom: 1px solid transparent;
  transition: background 200ms var(--ease), border-color 200ms var(--ease), backdrop-filter 200ms var(--ease);
}

.site-header[data-elevated="true"], .site-header.compact {
  background: rgba(247, 248, 251, 0.72);
  backdrop-filter: blur(18px);
  border-color: var(--rule);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  text-decoration: none;
  min-height: 44px;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(79, 82, 179, 0.36);
  border-radius: 14px;
  background: rgba(79, 82, 179, 0.09);
  color: var(--indigo);
  font-weight: 900;
}
.brand strong, .brand small { display: block; }
.brand strong { font-size: 0.95rem; }
.brand small { color: var(--ink-3); font-size: 0.72rem; margin-top: 0.12rem; }

.nav { display: flex; align-items: center; gap: clamp(0.4rem, 2vw, 1.1rem); flex-wrap: wrap; justify-content: flex-end; }
.nav a {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.65rem;
  border-radius: 999px;
  color: var(--ink-2);
  text-decoration: none;
  font-size: 0.86rem;
  transition: color 180ms var(--ease), background 180ms var(--ease);
}
.nav a:hover { color: var(--ink); background: rgba(30, 33, 48, 0.055); }

.hero {
  position: relative;
  min-height: calc(100svh - 78px);
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.62fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: stretch;
  padding: clamp(4rem, 10vw, 8rem) clamp(1.25rem, 5vw, 6rem) clamp(5rem, 9vw, 7rem);
  z-index: 1;
}

.hero-copy { align-self: start; }
.eyebrow, .section-kicker {
  color: var(--indigo);
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1, h2, h3, p { margin-block-start: 0; }
h1 {
  max-width: 12ch;
  margin-block-end: 1.35rem;
  font-size: clamp(3.1rem, 7.6vw, 7.2rem);
  line-height: 0.95;
  letter-spacing: -0.052em;
}
h2 {
  margin: 0;
  font-size: clamp(2.3rem, 5vw, 5.4rem);
  line-height: 0.97;
  letter-spacing: -0.045em;
  max-width: 16ch;
}
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); line-height: 1.05; margin-block-end: 0.8rem; }

.lede {
  max-width: 62ch;
  color: var(--ink-2);
  font-size: clamp(1.05rem, 1.6vw, 1.28rem);
  line-height: 1.6;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 0.85rem; margin-top: 2rem; }

.button, .ghost-button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  padding: 0.86rem 1rem;
  font-weight: 800;
  text-decoration: none;
  transition: transform 180ms var(--ease), background 180ms var(--ease), color 180ms var(--ease), border-color 180ms var(--ease), box-shadow 180ms var(--ease);
}
.button:hover, .ghost-button:hover { transform: translateY(-2px); }
.button.primary { background: var(--indigo); color: var(--paper-2); box-shadow: 0 10px 34px rgba(79, 82, 179, 0.32); }
.button.secondary, .ghost-button { border: 1px solid var(--rule); color: var(--ink); background: rgba(255, 255, 255, 0.72); backdrop-filter: blur(12px); }
.ghost-button { cursor: pointer; font: inherit; font-size: 0.9rem; }

.proof-window {
  align-self: stretch;
  border: 1px solid rgba(79, 82, 179, 0.28);
  border-radius: 22px;
  background:
    linear-gradient(160deg, rgba(255, 255, 255, 0.72), rgba(238, 240, 245, 0.58)),
    var(--paper-2);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.window-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid var(--rule);
  padding: 0.9rem 1rem;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 0.76rem;
}
.window-bar span { width: 10px; height: 10px; border-radius: 50%; background: var(--fog); }
.window-bar span:nth-child(2) { background: var(--indigo); }
.window-bar span:nth-child(3) { background: var(--green); }
.window-bar strong { margin-left: auto; color: var(--ink-2); font-weight: 700; }

.proof-stats { margin: 0; padding: 1.1rem; display: grid; gap: 0.8rem; }
.proof-stats div {
  border: 1px solid var(--rule);
  border-radius: 18px;
  background: rgba(30, 33, 48, 0.035);
  padding: 1rem;
}
.proof-stats dt { color: var(--ink); font-weight: 900; margin-bottom: 0.28rem; }
.proof-stats dd { margin: 0; color: var(--ink-2); line-height: 1.5; }

.verify-strip {
  list-style: none;
  display: grid;
  gap: 0.45rem;
  margin: 0;
  padding: 0 1.1rem 1.1rem;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.verify-strip li { position: relative; padding-left: 1rem; }
.verify-strip li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45em;
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 999px;
  background: var(--green);
  box-shadow: 0 0 14px rgba(74, 124, 89, 0.5);
}

.section { padding: clamp(4.5rem, 9vw, 8rem) clamp(1.25rem, 5vw, 6rem); }

.split-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(260px, 0.5fr);
  gap: clamp(1.5rem, 5vw, 4rem);
  align-items: end;
  margin-top: 0.8rem;
  margin-bottom: 2.2rem;
}
.split-heading p { color: var(--ink-2); line-height: 1.65; font-size: 1.02rem; }

.card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }

.proof-card {
  min-height: 300px;
  display: flex;
  flex-direction: column;
  border: 1px solid rgba(30, 33, 48, 0.08);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.62);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(12px);
  padding: clamp(1.1rem, 2vw, 1.4rem);
  transform-style: preserve-3d;
  perspective: 1200px;
  transition: transform 220ms var(--ease), box-shadow 220ms var(--ease), border-color 220ms var(--ease), background 220ms var(--ease);
  cursor: default;
  outline: none;
}
.proof-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: rgba(79, 82, 179, 0.28); background: rgba(255, 255, 255, 0.76); }
.proof-card.matte {
  background: rgba(226, 229, 239, 0.82);
  box-shadow: 0 4px 14px rgba(30, 33, 48, 0.1);
  border-color: rgba(30, 33, 48, 0.06);
}
.proof-card.matte:hover { background: rgba(238, 240, 245, 0.88); }

.proof-card p { color: var(--ink-2); line-height: 1.58; }
.proof-card a, .footer a { min-height: 44px; display: inline-flex; align-items: center; width: fit-content; color: var(--indigo); font-weight: 800; font-underline-offset: 0.22em; }
.proof-card a { margin-top: auto; }

.label {
  width: max-content;
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border-radius: 999px;
  padding: 0.24rem 0.62rem;
  margin-bottom: 1.2rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.frosted-label { background: rgba(79, 82, 179, 0.12); color: var(--indigo-deep); border: 1px solid rgba(79, 82, 179, 0.26); }
.matte-label { background: rgba(142, 148, 193, 0.18); color: #5c5490; border: 1px solid rgba(142, 148, 193, 0.36); }

.process { background: linear-gradient(180deg, rgba(238, 240, 245, 0.88), rgba(247, 248, 251, 0.94)); }

.contact-form {
  border: 1px solid rgba(30, 33, 48, 0.08);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.66);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(12px);
  padding: clamp(1.5rem, 3vw, 2.2rem);
  max-width: 940px;
}
.form-title { max-width: 22ch; }
.form-description { color: var(--ink-2); max-width: 60ch; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.9rem; margin-top: 1.4rem; }

.field { display: flex; flex-direction: column; gap: 0.3rem; }
.field.full { grid-column: 1 / -1; }

label { font-weight: 800; font-size: 0.86rem; letter-spacing: 0.02em; }
.checkbox { display: flex; align-items: flex-start; gap: 0.5rem; font-weight: 600; cursor: pointer; }
.checkbox input { width: 18px; height: 18px; accent-color: var(--indigo); margin-top: 0.1rem; }

input, textarea {
  width: 100%;
  border: 1px solid var(--rule);
  border-radius: 14px;
  padding: 0.72rem 0.85rem;
  background: rgba(255, 255, 255, 0.7);
  color: var(--ink);
  font: inherit;
  transition: border-color 180ms var(--ease), box-shadow 180ms var(--ease);
}
input:focus, textarea:focus { outline: none; border-color: rgba(79, 82, 179, 0.42); box-shadow: 0 0 0 4px rgba(79, 82, 179, 0.12); }
input:invalid:not(:placeholder-shown), textarea:invalid:not(:placeholder-shown) { border-color: rgba(180, 70, 70, 0.45); }

.field-error { color: #a04040; font-size: 0.8rem; min-height: 1rem; }
.form-actions { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-top: 0.6rem; }
.form-result { margin-top: 1rem; }
.result-card {
  border: 1px solid rgba(74, 124, 89, 0.38);
  border-radius: 18px;
  background: rgba(74, 124, 89, 0.1);
  padding: 1rem 1.1rem;
}
.result-card strong { display: block; margin-bottom: 0.25rem; }
.result-card p { margin: 0; color: var(--ink-2); }

.closing {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(260px, 0.5fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
  background: radial-gradient(circle at 76% 18%, rgba(79, 82, 179, 0.12), transparent 24rem), var(--paper);
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  border-top: 1px solid var(--rule);
  padding: 1.4rem clamp(1.25rem, 5vw, 6rem);
  color: var(--ink-3);
  position: relative;
  z-index: 1;
}
.footer p { margin: 0; }

.concept-panel {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(30, 33, 48, 0.42);
  backdrop-filter: blur(14px);
}
.concept-panel[hidden] { display: none; }

.panel-card {
  position: relative;
  width: min(560px, 100%);
  border: 1px solid rgba(142, 148, 193, 0.44);
  border-radius: 24px;
  background: rgba(247, 248, 251, 0.84);
  backdrop-filter: blur(14px);
  padding: clamp(1.35rem, 4vw, 2rem);
  box-shadow: var(--shadow);
}
.panel-card p { color: var(--ink-2); line-height: 1.6; }
.panel-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 42px;
  height: 42px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.76);
  color: var(--ink);
  cursor: pointer;
  font-size: 1.5rem;
}
.mini-metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.8rem; margin-top: 1.4rem; }
.mini-metrics div { border: 1px solid var(--rule); border-radius: 18px; padding: 1rem; }
.mini-metrics strong { display: block; color: var(--indigo); font-size: 1.8rem; }
.mini-metrics span { color: var(--ink-2); font-size: 0.82rem; }

.guide-body { background: var(--paper); }
.guide-main { padding: clamp(3rem, 7vw, 6rem) clamp(1.25rem, 5vw, 6rem); }
.guide-article { width: min(920px, 100%); margin: 0 auto; }
.guide-article h1 { max-width: 12ch; font-size: clamp(3.2rem, 8vw, 7.2rem); }
.guide-article section { border-top: 1px solid var(--rule); padding-top: 2rem; margin-top: 2rem; }
.guide-article p, .guide-article li { color: var(--ink-2); line-height: 1.65; font-size: 1.02rem; }
.guide-article code { background: rgba(79, 82, 179, 0.1); color: var(--indigo-deep); padding: 0.1rem 0.28rem; border-radius: 6px; }
.guide-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 1.2rem; }
.pass-list { color: var(--ink-2); line-height: 1.65; }

@media (max-width: 980px) {
  .hero, .closing, .split-heading { grid-template-columns: 1fr; }
  .proof-window { justify-self: stretch; }
  .card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .guide-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .site-header { align-items: flex-start; flex-direction: column; }
  .nav { justify-content: flex-start; }
  .hero { padding-top: 3rem; }
  h1 { font-size: clamp(3rem, 17vw, 4.5rem); }
  .card-grid, .form-grid, .mini-metrics { grid-template-columns: 1fr; }
  .proof-card { min-height: unset; }
  .hero-actions .button { width: 100%; }
  .form-actions { flex-direction: column; align-items: stretch; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .proof-card:hover { transform: none; }
  .surface { display: none; }
}