:root {
  --color-bg: #e7eef2;
  --color-bg-deep: #d3e0e8;
  --color-surface: rgba(255, 255, 255, 0.72);
  --color-surface-solid: #f7fafc;
  --color-ink: #102033;
  --color-muted: #4a5d70;
  --color-accent: #0f766e;
  --color-accent-hover: #0d5f59;
  --color-accent-soft: rgba(15, 118, 110, 0.12);
  --color-signal: #c2410c;
  --color-signal-soft: rgba(194, 65, 12, 0.12);
  --color-border: rgba(16, 32, 51, 0.12);
  --color-good: #166534;
  --color-warn: #9a3412;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --font-display: "Bricolage Grotesque", Georgia, serif;
  --font-body: "Figtree", system-ui, sans-serif;
  --max-width: 1080px;
  --shadow: 0 18px 50px rgba(16, 32, 51, 0.08);
  --header-h: 68px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.65;
  min-height: 100vh;
  position: relative;
}

.bg-atmosphere {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse 80% 55% at 12% -10%, rgba(15, 118, 110, 0.18), transparent 55%),
    radial-gradient(ellipse 70% 50% at 95% 8%, rgba(194, 65, 12, 0.12), transparent 50%),
    radial-gradient(ellipse 60% 40% at 50% 100%, rgba(59, 130, 246, 0.1), transparent 55%),
    linear-gradient(165deg, #eaf2f6 0%, #dce7ee 45%, #e8ece8 100%);
  pointer-events: none;
}

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(231, 238, 242, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}

.logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--color-ink);
  letter-spacing: -0.02em;
  text-decoration: none;
}

.logo:hover { text-decoration: none; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 22px;
}

.site-nav a {
  color: var(--color-muted);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
}

.site-nav a:hover { color: var(--color-ink); }

.site-nav a.btn--primary {
  color: #fff;
  font-size: 0.92rem;
}

.site-nav a.btn--primary:hover {
  color: #fff;
  background: var(--color-accent-hover);
}

.menu-toggle {
  display: none;
  background: var(--color-surface-solid);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-family: var(--font-body);
  font-weight: 600;
  color: var(--color-ink);
  cursor: pointer;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background 160ms ease, transform 180ms ease, box-shadow 180ms ease, color 160ms ease;
}

.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn--primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 8px 24px rgba(15, 118, 110, 0.25);
}

.btn--primary:hover { background: var(--color-accent-hover); color: #fff; }

.btn--ghost {
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--color-border);
  color: var(--color-ink);
}

.btn--ghost:hover { background: #fff; color: var(--color-ink); }

.btn--lg { padding: 14px 26px; font-size: 1rem; }

/* Hero */
.hero {
  position: relative;
  min-height: calc(100vh - var(--header-h));
  display: flex;
  align-items: flex-end;
  padding: 72px 0 88px;
  overflow: hidden;
}

.hero__plane {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(231, 238, 242, 0.15) 0%, rgba(231, 238, 242, 0.92) 78%),
    radial-gradient(ellipse 90% 70% at 70% 20%, rgba(15, 118, 110, 0.22), transparent 60%),
    radial-gradient(ellipse 50% 45% at 15% 60%, rgba(194, 65, 12, 0.16), transparent 55%),
    url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.35'/%3E%3C/svg%3E");
  background-size: cover, cover, cover, 180px;
  animation: heroDrift 18s ease-in-out infinite alternate;
}

@keyframes heroDrift {
  from { transform: scale(1) translate3d(0, 0, 0); }
  to { transform: scale(1.04) translate3d(-1.5%, 1%, 0); }
}

.brand-mark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.4rem, 7vw, 4.6rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
  margin-bottom: 20px;
  color: var(--color-ink);
}

.brand-mark--light { color: #f4f8fb; }

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3.4vw, 2.35rem);
  font-weight: 700;
  line-height: 1.2;
  max-width: 22ch;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero__lead {
  font-size: 1.1rem;
  color: var(--color-muted);
  max-width: 40rem;
  margin-bottom: 28px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero__content {
  animation: riseIn 700ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes riseIn {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Sections */
.section {
  padding: 88px 0;
}

.section--alt {
  background: rgba(255, 255, 255, 0.38);
  border-block: 1px solid var(--color-border);
}

.section__label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 10px;
}

.section h2 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 14px;
  max-width: 22ch;
}

.section__lead {
  font-size: 1.08rem;
  color: var(--color-muted);
  max-width: 46rem;
  margin-bottom: 36px;
}

/* Calculator */
.calc {
  display: grid;
  gap: 22px;
  max-width: 720px;
}

.calc__step {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-md);
  padding: 22px 22px 20px;
}

.calc__step legend {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  padding: 0 6px;
  margin-bottom: 4px;
}

.calc__hint {
  font-size: 0.92rem;
  color: var(--color-muted);
  margin: 8px 0 14px;
}

.calc__hours {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 12px 0 16px;
}

.calc__hours-field {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
}

.calc__hours-field input[type="number"] {
  width: 5.5rem;
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 800;
  border: none;
  background: transparent;
  color: var(--color-ink);
  outline: none;
  letter-spacing: -0.03em;
}

.calc__hours input[type="range"] {
  width: 100%;
  accent-color: var(--color-accent);
}

.chip-row, .choice-row, .goal-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip {
  border: 1px solid var(--color-border);
  background: var(--color-surface-solid);
  border-radius: 999px;
  padding: 8px 14px;
  font-family: var(--font-body);
  font-weight: 600;
  color: var(--color-muted);
  cursor: pointer;
  transition: background 150ms ease, color 150ms ease, border-color 150ms ease;
}

.chip:hover, .chip.is-active {
  background: var(--color-accent-soft);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.choice, .goal {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-solid);
  cursor: pointer;
  font-weight: 500;
  transition: border-color 150ms ease, background 150ms ease;
}

.choice:has(input:checked),
.goal:has(input:checked) {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.choice input, .goal input { margin-top: 3px; accent-color: var(--color-accent); }

.goal-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.calc__actions { margin-top: 4px; }

.calc-results {
  margin-top: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(232, 245, 242, 0.85));
  box-shadow: var(--shadow);
  padding: 28px;
  animation: riseIn 500ms ease both;
}

.calc-results[hidden] { display: none; }

.calc-results__eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-signal);
  margin-bottom: 8px;
}

.calc-results__eyebrow.is-good { color: var(--color-good); }

.calc-results h3 {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.calc-results__lead {
  color: var(--color-muted);
  margin-bottom: 22px;
  max-width: 42rem;
}

.swap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin-bottom: 22px;
}

.swap {
  padding: 16px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--color-border);
}

.swap strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin-bottom: 4px;
}

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

.calc-results__next {
  padding-top: 18px;
  border-top: 1px solid var(--color-border);
  color: var(--color-ink);
}

.calc-results__reassure {
  margin-top: 4px;
  margin-bottom: 16px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: rgba(15, 118, 110, 0.1);
  border: 1px solid rgba(15, 118, 110, 0.22);
  color: var(--color-ink);
  font-weight: 500;
  line-height: 1.55;
}

.calc-results__next a { font-weight: 700; }

/* Platform controls */
.platform-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.platform-tab {
  border: 1px solid var(--color-border);
  background: var(--color-surface-solid);
  color: var(--color-muted);
  border-radius: 999px;
  padding: 9px 14px;
  font-family: var(--font-body);
  font-weight: 600;
  cursor: pointer;
  transition: background 150ms ease, color 150ms ease, border-color 150ms ease;
}

.platform-tab:hover,
.platform-tab[aria-selected="true"] {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: #fff;
}

.platform-panel {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow);
  margin-bottom: 36px;
  min-height: 220px;
}

.platform-panel h3 {
  font-family: var(--font-display);
  font-size: 1.55rem;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.platform-panel__summary {
  color: var(--color-muted);
  margin-bottom: 20px;
  max-width: 48rem;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.filter-chip {
  border: 1px solid var(--color-border);
  background: transparent;
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-muted);
  cursor: pointer;
  font-family: var(--font-body);
}

.filter-chip.is-active {
  background: var(--color-accent-soft);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.control-list {
  display: grid;
  gap: 12px;
}

.control-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: start;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--color-border);
}

.control-item__check {
  display: flex;
  padding-top: 2px;
  cursor: pointer;
}

.control-item__check input {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--color-accent);
}

.control-item__title {
  font-weight: 700;
  margin-bottom: 4px;
}

.control-item__body {
  color: var(--color-muted);
  font-size: 0.95rem;
}

.control-item__tag {
  display: inline-block;
  margin-top: 8px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.control-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.control-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: none;
  background: var(--color-accent);
  color: #fff !important;
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none !important;
  cursor: pointer;
  transition: background 150ms ease, transform 150ms ease;
}

.control-link:hover {
  background: var(--color-accent-hover);
  color: #fff !important;
  transform: translateY(-1px);
}

.control-link--secondary {
  background: transparent;
  color: var(--color-accent) !important;
  border: 1px solid var(--color-accent);
}

.control-link--secondary:hover {
  background: var(--color-accent-soft);
  color: var(--color-accent) !important;
}

.control-item.is-done {
  opacity: 0.72;
  background: var(--color-accent-soft);
}

/* Insights */
.insight-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.insight h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.insight p { color: var(--color-muted); }

.about__note {
  max-width: 42rem;
  font-size: 1.05rem;
  color: var(--color-ink);
  padding: 18px 20px;
  border-left: 3px solid var(--color-accent);
  background: rgba(255, 255, 255, 0.45);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.future-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-bottom: 22px;
}

.future-card {
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  backdrop-filter: blur(8px);
}

.future-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.future-card p { color: var(--color-muted); }

.future-footnote {
  color: var(--color-muted);
  font-size: 0.95rem;
  max-width: 40rem;
}

/* Closing */
.closing {
  padding: 96px 0;
  background:
    linear-gradient(145deg, #0f2a33 0%, #134e4a 55%, #1c3d4a 100%);
  color: #e8f2f4;
  position: relative;
  overflow: hidden;
}

.closing::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 50% 60% at 80% 20%, rgba(194, 65, 12, 0.28), transparent 55%),
    radial-gradient(ellipse 40% 50% at 10% 80%, rgba(45, 212, 191, 0.18), transparent 50%);
  pointer-events: none;
  animation: heroDrift 20s ease-in-out infinite alternate;
}

.closing__inner {
  position: relative;
  max-width: 40rem;
}

.closing h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.closing p {
  color: rgba(232, 242, 244, 0.82);
  margin-bottom: 24px;
  font-size: 1.08rem;
}

/* Footer */
.site-footer {
  padding: 56px 0 28px;
  background: #0c1822;
  color: rgba(232, 242, 244, 0.78);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 28px;
  margin-bottom: 36px;
}

.site-footer h4 {
  font-family: var(--font-display);
  color: #f4f8fb;
  margin-bottom: 10px;
}

.footer-links {
  list-style: none;
  display: grid;
  gap: 8px;
}

.footer-links a {
  color: rgba(232, 242, 244, 0.78);
  text-decoration: none;
}

.footer-links a:hover { color: #fff; }

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 18px;
  font-size: 0.88rem;
  color: rgba(232, 242, 244, 0.55);
}

.footer-bottom a {
  color: rgba(232, 242, 244, 0.9);
  text-decoration: underline;
}

.footer-bottom a:hover { color: #fff; }

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 560ms ease, transform 560ms ease;
  transition-delay: var(--reveal-delay, 0ms);
}

.reveal--visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .hero__plane,
  .closing::before { animation: none; }
  .hero__content,
  .calc-results,
  .reveal { animation: none; opacity: 1; transform: none; }
  .btn:hover { transform: none; }
}

@media (max-width: 860px) {
  .insight-grid,
  .future-grid,
  .footer-grid { grid-template-columns: 1fr; }

  .menu-toggle { display: inline-flex; }

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(247, 250, 252, 0.98);
    border-bottom: 1px solid var(--color-border);
    padding: 12px 24px 18px;
  }

  .site-nav.open { display: flex; }

  .site-nav a {
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
  }

  .site-nav .btn { margin-top: 10px; border: none; }

  .hero { min-height: auto; padding: 56px 0 64px; align-items: flex-start; }

  .brand-mark { font-size: clamp(2.2rem, 12vw, 3.4rem); }
}

@media (max-width: 520px) {
  .hero__actions { flex-direction: column; align-items: stretch; }
  .platform-panel { padding: 18px; }
  .calc-results { padding: 20px; }
}