:root {
  --blue: #0d3b66;
  --sky: #0f6b8f;
  --teal: #059669;
  --ink: #1f2937;
  --muted: #6b7280;
  --light: #f3f4f6;
  --soft: #e0f2fe;
  --paper: #f7f4ee;
  --white: #ffffff;
  --line: rgba(13, 59, 102, 0.12);
  --shadow: 0 18px 50px rgba(13, 59, 102, 0.08);
  --radius: 18px;
  --nav-w: 17rem;
  --max: 68rem;
  --font: "Segoe UI", Aptos, "Helvetica Neue", Arial, sans-serif;
  --display: "Segoe UI Semibold", "Segoe UI", Aptos, Arial, sans-serif;
  --bg: var(--paper);
  --fg: var(--ink);
  --card: var(--white);
  --accent: var(--teal);
}

html[data-theme="dark"] {
  --bg: #0b1622;
  --fg: #e8eef3;
  --card: #12202e;
  --paper: #0b1622;
  --white: #12202e;
  --ink: #e8eef3;
  --muted: #9aa8b5;
  --light: #1a2b3b;
  --soft: #163246;
  --line: rgba(224, 242, 254, 0.1);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--fg);
  background: var(--bg);
  line-height: 1.55;
  font-size: 17px;
}

img,
svg {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--sky);
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--blue);
  color: #fff;
  padding: 0.5rem 0.8rem;
  z-index: 80;
}

.skip-link:focus {
  top: 1rem;
}

.progress {
  position: fixed;
  top: 0;
  left: var(--nav-w);
  height: 3px;
  width: 0;
  z-index: 60;
  background: linear-gradient(90deg, var(--blue), var(--teal));
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: 0.7rem 1rem;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.wordmark {
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--blue);
  text-decoration: none;
  font-size: 1.2rem;
}

html[data-theme="dark"] .wordmark {
  color: #f3f4f6;
}

.wordmark span {
  background: linear-gradient(90deg, var(--blue), var(--teal));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

#nav-toggle {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--fg);
  border-radius: 10px;
  padding: 0.4rem 0.7rem;
  font: inherit;
}

.side-nav {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--nav-w);
  padding: 1.6rem 1.2rem 2rem;
  border-right: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 92%, var(--white));
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
  z-index: 30;
}

.side-nav .brand-block {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.12rem;
}

.side-nav .wordmark {
  display: inline;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: none;
  line-height: 1.1;
  font-size: 1.35rem;
}

.side-nav .wordmark:hover,
.side-nav .wordmark:focus {
  background: none;
  border-left-color: transparent;
}

.side-nav .brand-tag {
  display: block;
  margin: 0;
  padding: 0;
  max-width: 14rem;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.3;
}

.side-nav ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.side-nav ol a {
  display: block;
  text-decoration: none;
  color: var(--muted);
  font-size: 1.08rem;
  padding: 0.42rem 0.6rem;
  border-radius: 8px;
  border-left: 3px solid transparent;
}

.side-nav ol a.is-active,
.side-nav ol a:hover {
  color: var(--blue);
  background: var(--soft);
  border-left-color: var(--teal);
}

html[data-theme="dark"] .side-nav ol a.is-active,
html[data-theme="dark"] .side-nav ol a:hover {
  color: #fff;
}

.toggles {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.toggle-row {
  display: flex;
  gap: 0.35rem;
}

.toggle-row button {
  flex: 1;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--fg);
  border-radius: 8px;
  padding: 0.3rem 0.2rem;
  font: inherit;
  font-size: 0.78rem;
  cursor: pointer;
}

.toggle-row button[aria-pressed="true"] {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}

.page {
  margin-left: var(--nav-w);
}

main {
  max-width: calc(var(--max) + 4rem);
  margin: 0 auto;
  padding: 0 2rem 6rem;
}

.section {
  padding: 5.5rem 0 2rem;
  scroll-margin-top: 1.2rem;
}

.kicker {
  color: var(--teal);
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 700;
  margin: 0 0 0.7rem;
}

h1,
h2,
.headline {
  font-family: var(--display);
  letter-spacing: -0.035em;
  line-height: 1.12;
  color: var(--blue);
  margin: 0 0 1rem;
}

html[data-theme="dark"] h1,
html[data-theme="dark"] h2,
html[data-theme="dark"] .headline {
  color: #f8fafc;
}

.headline {
  font-size: clamp(1.8rem, 3.4vw, 2.7rem);
  font-weight: 700;
  max-width: 22ch;
}

.lead {
  font-size: 1.12rem;
  color: var(--muted);
  max-width: 58ch;
  margin: 0 0 2rem;
}

.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 3rem;
  align-items: center;
  padding-top: 4rem;
}

.hero .headline {
  max-width: 16ch;
  font-size: clamp(2.1rem, 4vw, 3.3rem);
}

.hero-visual {
  background:
    radial-gradient(circle at 80% 10%, rgba(5, 150, 105, 0.16), transparent 36%),
    linear-gradient(160deg, var(--white), var(--soft));
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 1.6rem;
  box-shadow: var(--shadow);
  display: grid;
  justify-items: end;
  align-content: start;
  gap: 0.6rem;
}

.window-hero {
  width: 100%;
  display: block;
}

svg g[data-notation][hidden],
svg g[data-notation].is-off {
  display: none !important;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin: 1.6rem 0 1.8rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  border-radius: 999px;
  padding: 0.75rem 1.25rem;
  font-weight: 650;
  border: 1px solid transparent;
  cursor: pointer;
  font: inherit;
}

.btn-primary {
  background: linear-gradient(90deg, var(--blue), var(--sky));
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: var(--blue);
  border-color: var(--line);
}

html[data-theme="dark"] .btn-ghost {
  color: #fff;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.stat {
  border-top: 2px solid var(--teal);
  padding-top: 0.55rem;
}

.stat b {
  display: block;
  font-size: clamp(1.15rem, 1.6vw, 1.35rem);
  line-height: 1.15;
  color: var(--blue);
}

html[data-theme="dark"] .stat b {
  color: #fff;
}

.stat span {
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.35;
}

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

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.3rem 1.35rem;
  box-shadow: var(--shadow);
}

.card h3 {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
  color: var(--blue);
}

html[data-theme="dark"] .card h3 {
  color: #fff;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
}

.flow {
  margin: 2rem 0 0.5rem;
  display: grid;
  gap: 0.75rem;
}

.flow-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
}

.flow-node {
  background: var(--blue);
  color: #fff;
  border-radius: 12px;
  padding: 0.55rem 0.75rem;
  font-size: 0.88rem;
  font-weight: 650;
}

.flow-node.sky {
  background: var(--sky);
}

.flow-node.teal {
  background: var(--teal);
}

.flow-node.soft {
  background: var(--soft);
  color: var(--blue);
  border: 1px solid color-mix(in srgb, var(--sky) 40%, transparent);
}

html[data-theme="dark"] .flow-node.soft {
  color: #e8eef3;
}

.flow-arrow {
  color: var(--sky);
  font-weight: 700;
}

.flow-split {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.45rem;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.8rem;
  margin: 0 0 2rem;
}

.stat-box {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem 1.1rem;
}

.stat-box strong {
  display: block;
  color: var(--blue);
  font-size: 1.15rem;
}

html[data-theme="dark"] .stat-box strong {
  color: #fff;
}

.stat-box span {
  color: var(--muted);
  font-size: 0.84rem;
}

.gallery-title {
  margin: 2rem 0 0.45rem;
  font-size: 1rem;
  color: var(--muted);
  font-weight: 600;
}

.gallery-lead {
  margin: 0 0 0.7rem;
  max-width: 40rem;
  color: var(--text);
  font-size: 0.95rem;
}

.typo-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0.7rem;
}

.typo {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.7rem 0.5rem 0.75rem;
  text-align: center;
}

.typo img {
  width: 72px;
  height: 60px;
  object-fit: contain;
}

.typo figcaption {
  margin-top: 0.35rem;
  font-size: 0.78rem;
  color: var(--muted);
}

.frames {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.6rem;
}

.frame {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.frame-visual {
  background:
    linear-gradient(180deg, var(--soft), var(--light));
  min-height: 160px;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.frame-visual img {
  width: 88px;
}

.frame-body {
  padding: 0.95rem 1.1rem 1.15rem;
}

.frame-body h3 {
  margin: 0 0 0.3rem;
  font-size: 1rem;
}

.frame-body p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.layers {
  display: grid;
  gap: 0.55rem;
  margin: 1.6rem 0 0.4rem;
}

.layer {
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: 1rem;
  align-items: center;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.8rem 1rem;
}

.layer b {
  color: var(--blue);
}

html[data-theme="dark"] .layer b {
  color: #fff;
}

.layer span {
  color: var(--muted);
  font-size: 0.95rem;
}

.sec-stack {
  display: grid;
  gap: 0.4rem;
  margin: 1.5rem 0;
}

.sec-stack li {
  list-style: none;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.55rem 0.85rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.sec-stack {
  margin-left: 0;
  padding: 0;
}

.sec-stack em {
  color: var(--muted);
  font-style: normal;
  font-variant-numeric: tabular-nums;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.path {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.3rem;
}

.path .now {
  color: var(--teal);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 700;
}

.path h3 {
  margin: 0.35rem 0 0.4rem;
}

.ladder {
  list-style: none;
  margin: 1.6rem 0 0.4rem;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.ladder-step {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem 1.15rem;
  position: relative;
}

.ladder-step.is-now {
  border-color: color-mix(in srgb, var(--teal) 55%, var(--line));
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--teal) 25%, transparent);
  background: color-mix(in srgb, var(--teal) 8%, var(--card));
}

.ladder-label {
  margin: 0;
  color: var(--teal);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 700;
}

.ladder-step h3 {
  margin: 0.3rem 0 0.35rem;
  font-size: 1.05rem;
}

.ladder-step p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.notation-toggle {
  display: inline-flex;
  gap: 0.35rem;
  margin: 0 0 0.85rem;
  padding: 0.25rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--soft) 70%, var(--card));
  border: 1px solid var(--line);
}

.notation-toggle--inline {
  margin: 0 0 1rem;
}

.notation-toggle button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 650;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  cursor: pointer;
}

.notation-toggle button[aria-pressed="true"] {
  background: var(--blue);
  color: #fff;
}

.notation-hint {
  margin: 0 0 0.7rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.cta-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1.4rem;
}

form {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.3rem;
  display: grid;
  gap: 0.75rem;
}

label {
  display: grid;
  gap: 0.3rem;
  font-size: 0.88rem;
  color: var(--muted);
}

input,
textarea {
  font: inherit;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.6rem 0.7rem;
}

textarea {
  min-height: 6.5rem;
  resize: vertical;
}

.form-hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.aside-list {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.aside-list li {
  margin: 0.4rem 0;
}

.email-line {
  margin-top: 1rem;
  color: var(--muted);
}

.site-footer {
  margin-left: var(--nav-w);
  padding: 2rem 2rem 3rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

details.depth {
  margin-top: 1.8rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.2rem 1rem 0.4rem;
}

details.depth summary {
  cursor: pointer;
  padding: 0.9rem 0;
  font-weight: 650;
  color: var(--blue);
  list-style: none;
}

html[data-theme="dark"] details.depth summary {
  color: #fff;
}

details.depth summary::-webkit-details-marker {
  display: none;
}

details.depth summary::after {
  content: "+";
  float: right;
  color: var(--teal);
  font-weight: 700;
}

details.depth[open] summary::after {
  content: "–";
}

.depth-body {
  padding: 0 0 1rem;
  color: var(--muted);
}

.depth-body p,
.depth-body li {
  max-width: 70ch;
}

.depth-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.ok,
.gap {
  border-radius: 12px;
  padding: 0.9rem 1rem;
}

.ok {
  background: color-mix(in srgb, var(--teal) 10%, var(--card));
}

.gap {
  background: color-mix(in srgb, #b45309 10%, var(--card));
}

.honest {
  margin-top: 1rem;
  padding: 0.9rem 1rem;
  border-left: 3px solid var(--sky);
  background: var(--light);
}

@media (max-width: 1080px) {
  .hero,
  .cards,
  .stat-row,
  .frames,
  .cta-grid,
  .split,
  .depth-grid {
    grid-template-columns: 1fr;
  }

  .typo-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .layer {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  .progress {
    left: 0;
  }

  .topbar {
    display: flex;
  }

  .side-nav {
    transform: translateX(-105%);
    transition: transform 0.2s ease;
    box-shadow: var(--shadow);
  }

  .side-nav.is-open {
    transform: none;
  }

  .page,
  .site-footer {
    margin-left: 0;
  }

  .hero {
    min-height: auto;
    padding-top: 1.5rem;
  }

  .stats {
    grid-template-columns: 1fr;
  }
}

@media print {
  .progress,
  .side-nav,
  .topbar,
  .actions,
  #meeting-form,
  .skip-link {
    display: none !important;
  }

  .page,
  .site-footer {
    margin: 0;
  }

  body {
    background: #fff;
    color: #111;
  }

  details.depth {
    break-inside: avoid;
  }

  details.depth:not([open]) {
    border: 0;
  }

  details.depth:not([open]) .depth-body {
    display: block;
  }

  a[href^="mailto"]::after {
    content: " (" attr(href) ")";
    font-size: 0.85em;
  }
}