:root {
  --ink: #0a1a2f;
  --ink-2: #11304d;
  --paper: #ffffff;
  --frost: #f3f8fc;
  --frost-2: #e9f2f8;
  --ice: #d9eaf6;
  --hair: #dce8f1;
  --azure: #1287cf;
  --azure-deep: #0a6aa6;
  --cyan: #4cc6e6;
  --heat: #ff6a3d;
  --heat-soft: #fff0eb;
  --text: #0a1a2f;
  --muted: #5c768c;
  --r: 16px;
  --r-lg: 24px;
  --shadow: 0 24px 60px -28px rgba(10, 40, 70, 0.35);
  --shadow-sm: 0 8px 26px -16px rgba(10, 40, 70, 0.4);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--frost);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
h1, h2, h3, .brand span { font-family: "Hanken Grotesk", "Inter", sans-serif; }
img, svg { max-width: 100%; }
a { color: inherit; }

/* Cool aurora backdrop */
.aurora {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(60% 50% at 78% 8%, rgba(76, 198, 230, 0.22), transparent 70%),
    radial-gradient(50% 40% at 10% 0%, rgba(18, 135, 207, 0.14), transparent 70%),
    linear-gradient(180deg, #eef6fb 0%, #f5fafd 38%, #ffffff 100%);
}

/* ---- Nav ---- */
.nav {
  max-width: 1140px; margin: 0 auto; padding: 22px 28px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font-weight: 700; font-size: 20px; letter-spacing: -0.02em; }
.brand strong { color: var(--azure); font-weight: 800; }
.brand-mark { color: var(--ink); }
.nav-links { display: flex; align-items: center; gap: 30px; font-size: 15px; }
.nav-links a { text-decoration: none; color: var(--ink-2); opacity: 0.85; transition: opacity 0.2s; }
.nav-links a:hover { opacity: 1; }
.nav-cta {
  background: var(--ink); color: #fff !important; opacity: 1 !important;
  padding: 9px 18px; border-radius: 999px; font-weight: 600; font-size: 14px;
}
.nav-cta:hover { background: var(--azure-deep); }

/* ---- Hero ---- */
.hero {
  max-width: 1140px; margin: 0 auto; padding: 40px 28px 30px;
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 40px; align-items: center;
}
.pill {
  display: inline-flex; align-items: center; gap: 9px;
  background: var(--heat-soft); color: var(--heat); border: 1px solid #ffd9cd;
  font-weight: 600; font-size: 13px; padding: 7px 14px; border-radius: 999px;
  letter-spacing: 0.01em;
}
.pulse { width: 8px; height: 8px; border-radius: 50%; background: var(--heat); box-shadow: 0 0 0 0 rgba(255,106,61,0.5); animation: pulse 1.8s infinite; }
@keyframes pulse { 0%{box-shadow:0 0 0 0 rgba(255,106,61,.5);} 70%{box-shadow:0 0 0 10px rgba(255,106,61,0);} 100%{box-shadow:0 0 0 0 rgba(255,106,61,0);} }

.hero h1 {
  font-size: clamp(38px, 5.2vw, 62px); line-height: 1.02; letter-spacing: -0.035em;
  font-weight: 800; margin: 20px 0 18px; color: var(--ink);
}
.hero h1 em { font-style: normal; color: var(--azure); }
.lede { font-size: 18px; color: var(--muted); max-width: 30em; margin: 0 0 28px; }

.join { display: flex; gap: 10px; max-width: 460px; }
.join input {
  flex: 1; min-width: 0; padding: 15px 18px; font-size: 16px; font-family: inherit;
  border: 1px solid var(--hair); border-radius: 12px; background: #fff; color: var(--ink);
  outline: none; transition: border-color 0.2s, box-shadow 0.2s;
}
.join input:focus { border-color: var(--azure); box-shadow: 0 0 0 4px rgba(18,135,207,0.14); }
.join button {
  padding: 15px 24px; font-size: 16px; font-weight: 700; font-family: "Hanken Grotesk", sans-serif;
  border: none; border-radius: 12px; cursor: pointer; white-space: nowrap;
  background: var(--ink); color: #fff; transition: transform 0.08s, background 0.2s;
}
.join button:hover { background: var(--azure-deep); }
.join button:active { transform: scale(0.98); }
.micro { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); margin-top: 14px; }

/* Hero art */
.hero-art { position: relative; display: flex; justify-content: center; }
.art-glow {
  position: absolute; width: 78%; height: 78%; top: 8%; left: 11%;
  background: radial-gradient(circle, rgba(76,198,230,0.35), transparent 68%);
  filter: blur(20px); z-index: 0;
}
.ac-illustration { position: relative; z-index: 1; width: 100%; max-width: 380px; filter: drop-shadow(0 30px 40px rgba(12,60,100,0.18)); }
.wave { opacity: 0; animation: wave 3s infinite ease-out; }
.w2 { animation-delay: 0.4s; } .w3 { animation-delay: 0.8s; }
@keyframes wave { 0%{opacity:0; transform:translateX(-4px);} 40%{opacity:.6;} 100%{opacity:0; transform:translateX(8px);} }
.flake { animation: float 4s infinite ease-in-out; }
.f2 { animation-delay: 1s; } .f3 { animation-delay: 2s; }
@keyframes float { 0%,100%{transform:translateY(0); opacity:.9;} 50%{transform:translateY(8px); opacity:.4;} }

.art-chip {
  position: absolute; z-index: 2; background: #fff; border: 1px solid var(--hair);
  border-radius: 14px; padding: 11px 14px; box-shadow: var(--shadow-sm);
  font-size: 14px; font-weight: 600; color: var(--ink); display: flex; align-items: center; gap: 9px;
}
.art-chip small { display: block; font-weight: 400; font-size: 11.5px; color: var(--muted); }
.art-chip-1 { top: 6%; left: -6%; animation: bob 5s infinite ease-in-out; }
.art-chip-2 { bottom: 8%; right: -8%; animation: bob 6s infinite ease-in-out 0.6s; }
@keyframes bob { 0%,100%{transform:translateY(0);} 50%{transform:translateY(-7px);} }
.dot { width: 9px; height: 9px; border-radius: 50%; flex-shrink: 0; }
.dot.ok { background: #1ea672; box-shadow: 0 0 0 3px rgba(30,166,114,0.16); }
.dot.warn { background: var(--azure); box-shadow: 0 0 0 3px rgba(18,135,207,0.16); }

/* ---- Trust strip ---- */
.strip {
  max-width: 1140px; margin: 18px auto 0; padding: 22px 28px;
  display: flex; align-items: center; gap: 26px; flex-wrap: wrap;
  border-top: 1px solid var(--hair); border-bottom: 1px solid var(--hair);
}
.strip-label { font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.strip ul { display: flex; gap: 30px; flex-wrap: wrap; list-style: none; margin: 0; padding: 0; }
.strip li { font-family: "Hanken Grotesk", sans-serif; font-weight: 700; font-size: 19px; color: var(--ink-2); opacity: 0.55; letter-spacing: -0.01em; }

/* ---- Section heads ---- */
section { scroll-margin-top: 24px; }
.sec-head { max-width: 1140px; margin: 0 auto; padding: 0 28px; text-align: center; }
.eyebrow { display: inline-block; font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--azure); font-weight: 700; }
.sec-head h2 { font-size: clamp(28px, 3.6vw, 42px); letter-spacing: -0.03em; font-weight: 800; margin: 12px 0 0; color: var(--ink); }
.sec-sub { color: var(--muted); font-size: 17px; margin: 12px auto 0; max-width: 34em; }

/* ---- How ---- */
.how { padding: 86px 0 30px; }
.steps {
  max-width: 1140px; margin: 46px auto 0; padding: 0 28px;
  list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px;
}
.steps li { position: relative; padding: 30px 26px; background: #fff; border: 1px solid var(--hair); border-radius: var(--r-lg); box-shadow: var(--shadow-sm); }
.step-no { position: absolute; top: 22px; right: 24px; font-family: "Hanken Grotesk", sans-serif; font-weight: 800; font-size: 30px; color: var(--frost-2); }
.steps h3 { font-size: 20px; letter-spacing: -0.02em; margin: 18px 0 8px; }
.steps p { color: var(--muted); font-size: 15.5px; margin: 0; }

/* ---- Models ---- */
.models { padding: 86px 0 30px; }
.model-grid {
  max-width: 1140px; margin: 46px auto 0; padding: 0 28px;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 24px;
}
.mcard {
  background: #fff; border: 1px solid var(--hair); border-radius: var(--r-lg);
  overflow: hidden; box-shadow: var(--shadow-sm); transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
  display: flex; flex-direction: column;
}
.mcard:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.mcard.sel { border-color: var(--azure); box-shadow: 0 0 0 2px rgba(18,135,207,0.25), var(--shadow); }
.mcard-photo {
  position: relative; aspect-ratio: 4 / 3; background: linear-gradient(160deg, #eef6fb, #dcebf5);
  display: flex; align-items: center; justify-content: center;
}
.mcard-photo svg { width: 46%; opacity: 0.55; }
.mcard-btu { position: absolute; top: 12px; left: 12px; background: rgba(10,26,47,0.82); color: #fff; font-size: 12px; font-weight: 600; padding: 5px 11px; border-radius: 999px; backdrop-filter: blur(4px); }
.mcard-body { padding: 18px 18px 20px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.mcard-body h3 { font-size: 17.5px; letter-spacing: -0.02em; margin: 0; }
.mcard-meta { font-size: 13px; color: var(--muted); }
.mcard-blurb { font-size: 14px; color: var(--ink-2); margin: 2px 0 0; }
.mcard-foot { display: flex; align-items: center; justify-content: space-between; margin-top: auto; padding-top: 14px; }
.mcard-price { font-family: "Hanken Grotesk", sans-serif; font-weight: 800; font-size: 18px; color: var(--ink); }
.mcard-price span { font-weight: 500; font-size: 12px; color: var(--muted); }
.track-btn {
  display: inline-flex; align-items: center; gap: 6px; cursor: pointer; user-select: none;
  font-size: 13.5px; font-weight: 600; color: var(--azure-deep);
  border: 1px solid var(--ice); background: var(--frost); padding: 8px 13px; border-radius: 999px; transition: all 0.16s;
}
.track-btn input { display: none; }
.mcard.sel .track-btn { background: var(--azure); color: #fff; border-color: var(--azure); }
.track-btn .tick { width: 15px; height: 15px; border-radius: 50%; border: 1.6px solid currentColor; display: inline-flex; align-items: center; justify-content: center; font-size: 10px; }
.amazon-btn { display: block; text-align: center; margin-top: 12px; padding: 10px 14px; border-radius: 10px; font-size: 14px; font-weight: 600; text-decoration: none; color: var(--ink); background: var(--frost-2); border: 1px solid var(--hair); transition: background 0.16s, color 0.16s; }
.amazon-btn:hover { background: var(--ink); color: #fff; }

/* ---- Calculator ---- */
.calc { padding: 86px 0 30px; }
.calc-inner {
  max-width: 1000px; margin: 0 auto; padding: 0 28px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center;
}
.calc-copy h2 { font-size: clamp(26px, 3.2vw, 36px); letter-spacing: -0.03em; margin: 12px 0 12px; }
.calc-copy p { color: var(--muted); font-size: 16px; }
.calc-panel { background: var(--ink); border-radius: var(--r-lg); padding: 30px; color: #fff; box-shadow: var(--shadow); }
.calc-panel label { display: block; font-size: 13px; font-weight: 600; color: #aecde6; margin-bottom: 16px; }
.calc-panel .field { display: flex; align-items: center; margin-top: 7px; }
.calc-panel input, .calc-panel select {
  width: 100%; margin-top: 7px; padding: 12px 14px; font-size: 15px; font-family: inherit;
  background: #0f2942; border: 1px solid #1d456b; border-radius: 11px; color: #fff; outline: none;
}
.calc-panel .field input { margin-top: 0; }
.calc-panel .field i { font-style: normal; color: #aecde6; margin-left: -34px; font-size: 14px; pointer-events: none; }
.calc-panel input:focus, .calc-panel select:focus { border-color: var(--cyan); }
.calc-out { margin-top: 22px; padding-top: 20px; border-top: 1px solid #1d456b; font-size: 15px; color: #cfe4f3; line-height: 1.55; }
.calc-out strong { font-family: "Hanken Grotesk", sans-serif; color: var(--cyan); font-size: 30px; font-weight: 800; display: block; letter-spacing: -0.02em; }

/* ---- Why ---- */
.why { padding: 86px 0 30px; }
.why-grid { max-width: 1140px; margin: 46px auto 0; padding: 0 28px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.why-grid article { padding: 8px 4px; }
.why-grid h3 { font-size: 19px; letter-spacing: -0.02em; margin: 16px 0 8px; }
.why-grid p { color: var(--muted); font-size: 15.5px; margin: 0; }

/* ---- Final CTA ---- */
.cta { padding: 70px 28px 90px; }
.cta-card {
  max-width: 760px; margin: 0 auto; text-align: center; color: #fff;
  background: linear-gradient(150deg, #0c2540 0%, #11436c 60%, #0a6aa6 100%);
  border-radius: 28px; padding: 56px 40px; box-shadow: var(--shadow); position: relative; overflow: hidden;
}
.cta-card::after { content: ""; position: absolute; width: 300px; height: 300px; top: -120px; right: -90px; background: radial-gradient(circle, rgba(76,198,230,0.35), transparent 70%); }
.cta-frost { color: var(--cyan); position: relative; }
.cta-card h2 { font-size: clamp(26px, 3.6vw, 38px); letter-spacing: -0.03em; margin: 16px 0 12px; color: #fff; position: relative; }
.cta-card p { color: #c4ddef; font-size: 17px; margin: 0 0 26px; position: relative; }
.join-lg { max-width: 480px; margin: 0 auto; position: relative; }
.join-lg button { background: var(--cyan); color: var(--ink); }
.join-lg button:hover { background: #6fd4ef; }
.micro-light { color: #a9cbe2; justify-content: center; }

/* ---- Footer ---- */
.foot { border-top: 1px solid var(--hair); background: #fff; }
.foot-inner { max-width: 1140px; margin: 0 auto; padding: 34px 28px; display: flex; align-items: center; gap: 30px; flex-wrap: wrap; }
.brand-foot { font-size: 17px; }
.foot-disc { font-size: 13px; color: var(--muted); margin: 0; max-width: 60ch; flex: 1; min-width: 280px; }

/* ---- Responsive ---- */
@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; gap: 10px; padding-top: 20px; }
  .hero-art { order: -1; margin-bottom: 10px; }
  .ac-illustration { max-width: 280px; }
  .art-chip-1 { left: 0; } .art-chip-2 { right: 0; }
  .steps, .why-grid { grid-template-columns: 1fr; }
  .calc-inner { grid-template-columns: 1fr; gap: 26px; }
  .nav-links a:not(.nav-cta) { display: none; }
}
@media (max-width: 460px) {
  .join { flex-direction: column; }
  .join button { width: 100%; }
}