/* TIP brand system. One spacing scale (8pt), two radii, one elevation.
   Palette is custom green + warm neutrals; no framework defaults. */

:root {
  --ink: #16181d;
  --ink-soft: #565d66;
  --paper: #faf9f5;
  --surface: #ffffff;
  --surface-2: #f3f1ea;
  --line: #e6e2d8;
  --green: #1f7a4d;
  --green-deep: #155c3a;
  --green-tint: #eaf3ed;
  --clay: #b5462f;

  --r: 12px;
  --r-sm: 8px;
  --r-pill: 999px;
  --shadow: 0 1px 2px rgba(16, 24, 30, 0.05), 0 10px 30px -16px rgba(16, 24, 30, 0.22);

  --sp-1: 8px;
  --sp-2: 16px;
  --sp-3: 24px;
  --sp-4: 32px;
  --sp-5: 48px;
  --sp-6: 64px;
  --sp-7: 96px;

  --font-head: "Space Grotesk", "Segoe UI", system-ui, sans-serif;
  --font-body: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --maxw: 1080px;
}

[data-theme="dark"] {
  --ink: #eef1ee;
  --ink-soft: #9aa3a0;
  --paper: #0f1311;
  --surface: #161b18;
  --surface-2: #131816;
  --line: #26302b;
  --green: #46b07c;
  --green-deep: #6cc99a;
  --green-tint: #16241d;
  --clay: #e0805f;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 32px -18px rgba(0, 0, 0, 0.7);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  font-family: var(--font-head);
  line-height: 1.1;
  margin: 0 0 var(--sp-2);
  letter-spacing: -0.01em;
}

h1 {
  font-weight: 700;
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  letter-spacing: -0.02em;
}

h2 {
  font-weight: 600;
  font-size: clamp(1.6rem, 3vw, 2.1rem);
}

h3 {
  font-weight: 600;
  font-size: 1.2rem;
}

p {
  margin: 0 0 var(--sp-2);
}

a {
  color: var(--green-deep);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

code {
  font-family: ui-monospace, "SF Mono", "Cascadia Code", Menlo, monospace;
  font-size: 0.9em;
  background: var(--surface-2);
  padding: 2px 6px;
  border-radius: 6px;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--sp-3);
}

.narrow {
  max-width: 720px;
}

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

.skip-link:focus {
  position: fixed;
  top: var(--sp-2);
  left: var(--sp-2);
  width: auto;
  height: auto;
  clip: auto;
  padding: var(--sp-1) var(--sp-2);
  background: var(--green);
  color: #fff;
  border-radius: var(--r-sm);
  z-index: 100;
}

:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  color: var(--ink);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
}

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

.nav {
  margin-left: auto;
}

.nav-menu {
  display: flex;
  gap: var(--sp-3);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-menu a {
  color: var(--ink-soft);
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-menu a:hover {
  color: var(--ink);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  width: 44px;
  height: 44px;
  cursor: pointer;
}

.nav-toggle-bar,
.nav-toggle-bar::before,
.nav-toggle-bar::after {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  margin: 0 auto;
  position: relative;
  content: "";
}

.nav-toggle-bar::before {
  position: absolute;
  top: -6px;
}

.nav-toggle-bar::after {
  position: absolute;
  top: 6px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  color: var(--ink-soft);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 8px 12px;
  min-height: 40px;
  cursor: pointer;
}

.theme-toggle:hover {
  color: var(--ink);
  border-color: var(--ink-soft);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-1);
  min-height: 44px;
  padding: 10px 20px;
  border-radius: var(--r-sm);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    background-color 0.15s ease,
    border-color 0.15s ease,
    color 0.15s ease;
}

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

.btn-primary {
  background: var(--green);
  color: #fff;
  border-color: var(--green);
}

.btn-primary:hover {
  background: var(--green-deep);
  border-color: var(--green-deep);
}

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

.btn-ghost:hover {
  background: var(--green-tint);
  border-color: var(--green);
}

/* Hero */
.hero {
  padding: var(--sp-7) 0 var(--sp-6);
  background: linear-gradient(180deg, var(--green-tint), var(--paper));
}

.hero-inner {
  max-width: 760px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--green-deep);
  margin-bottom: var(--sp-2);
}

.lede {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 60ch;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-top: var(--sp-3);
}

.hero-metric {
  margin-top: var(--sp-5);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.metric-label {
  font-size: 0.85rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.metric-value {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-variant-numeric: tabular-nums;
  color: var(--green-deep);
  min-height: 1.2em;
  display: inline-flex;
  align-items: center;
}

/* Sections */
.section {
  padding: var(--sp-6) 0;
}

.section-alt {
  background: var(--surface-2);
}

.section-lede {
  color: var(--ink-soft);
  max-width: 64ch;
  margin-bottom: var(--sp-4);
}

.symptoms {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--sp-1);
  max-width: 52ch;
}

.symptoms li {
  padding: var(--sp-2) 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
}

.symptoms li:last-child {
  border-bottom: 0;
}

/* Cards */
.cards {
  display: grid;
  gap: var(--sp-3);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .cards {
    grid-template-columns: 1fr 1fr;
  }
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: var(--sp-3);
  box-shadow: var(--shadow);
}

.card h3 {
  color: var(--green-deep);
}

.card p {
  margin: 0;
  color: var(--ink-soft);
}

/* Expander demo */
.expander {
  display: flex;
  gap: var(--sp-2);
  flex-wrap: wrap;
  max-width: 560px;
}

.expander input {
  flex: 1 1 240px;
  min-height: 44px;
  padding: 10px 14px;
  font: inherit;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
}

.expander input:focus-visible {
  border-color: var(--green);
  outline-offset: 0;
}

.expander-out {
  margin-top: var(--sp-4);
}

.expander-out[hidden] {
  display: none;
}

.expander-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-2);
  margin-bottom: var(--sp-3);
}

.stat-label {
  display: block;
  font-size: 0.8rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}

.stat-value {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.4rem;
  font-variant-numeric: tabular-nums;
}

.stat-grow {
  color: var(--green-deep);
}

.deliverables {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.deliverables li {
  display: flex;
  justify-content: space-between;
  gap: var(--sp-2);
  padding: 10px var(--sp-2);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
}

.deliverables .d-name {
  color: var(--ink);
}

.deliverables .d-tok {
  color: var(--green-deep);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.deliverables li.is-pending {
  opacity: 0.45;
}

/* Org chart */
.orgchart {
  text-align: center;
  margin-top: var(--sp-2);
}

.org-node {
  display: inline-block;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  padding: 12px 16px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.95rem;
  box-shadow: var(--shadow);
}

.org-root {
  background: var(--green);
  color: #fff;
  border-color: var(--green);
  margin-bottom: var(--sp-3);
}

.org-branches {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--sp-3);
}

@media (min-width: 760px) {
  .org-branches {
    grid-template-columns: repeat(4, 1fr);
    align-items: start;
  }
}

.org-branches > li {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-2);
}

.org-branches > li::before {
  content: "";
  width: 1px;
  height: 18px;
  background: var(--line);
}

.org-branches ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.org-branches ul > li::before {
  content: "";
  display: block;
  width: 1px;
  height: 14px;
  background: var(--line);
  margin: 0 auto var(--sp-1);
}

.org-sub {
  font-weight: 500;
  background: var(--green-tint);
  border-color: var(--green-tint);
  color: var(--green-deep);
}

/* Targets table */
.table-wrap {
  overflow-x: auto;
}

.targets {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
}

.targets th,
.targets td {
  text-align: left;
  padding: var(--sp-2) var(--sp-3);
  border-bottom: 1px solid var(--line);
}

.targets thead th {
  font-family: var(--font-head);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  background: var(--surface-2);
}

.targets tbody tr:last-child th,
.targets tbody tr:last-child td {
  border-bottom: 0;
}

.targets td {
  color: var(--green-deep);
  font-weight: 600;
}

/* Ledger */
.ledger-wrap {
  display: grid;
  gap: var(--sp-4);
}

@media (min-width: 820px) {
  .ledger-wrap {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }
}

.ledger-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: var(--sp-4);
  box-shadow: var(--shadow);
}

.ledger-total {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(2.4rem, 7vw, 4rem);
  font-variant-numeric: tabular-nums;
  color: var(--green-deep);
  line-height: 1;
  margin: var(--sp-1) 0;
  min-height: 1em;
}

.ledger-meta {
  font-size: 0.9rem;
  color: var(--ink-soft);
}

/* Steps + code */
.steps {
  max-width: 60ch;
  color: var(--ink);
  padding-left: 1.4em;
  margin-bottom: var(--sp-4);
}

.steps li {
  margin-bottom: var(--sp-1);
}

.codeblock {
  position: relative;
  background: var(--ink);
  color: #f4f6f4;
  border-radius: var(--r);
  padding: var(--sp-3);
  overflow-x: auto;
}

[data-theme="dark"] .codeblock {
  background: #0a0d0b;
  border: 1px solid var(--line);
}

.codeblock pre {
  margin: 0;
}

.codeblock code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: 0.9rem;
  line-height: 1.7;
}

.copy-btn {
  position: absolute;
  top: var(--sp-2);
  right: var(--sp-2);
  background: rgba(255, 255, 255, 0.1);
  color: #f4f6f4;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 6px;
  padding: 6px 12px;
  font: inherit;
  font-size: 0.8rem;
  cursor: pointer;
}

.copy-btn:hover {
  background: rgba(255, 255, 255, 0.18);
}

/* Footer */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--line);
  padding: var(--sp-5) 0;
}

.footer-inner {
  display: grid;
  gap: var(--sp-3);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.attribution {
  margin: 0;
  font-size: 1rem;
  font-weight: 500;
  color: var(--ink);
  max-width: 48ch;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
}

.footer-links a {
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--ink);
}

.copyright {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

/* Skeleton loaders */
.skeleton {
  display: inline-block;
  width: 8ch;
  height: 1em;
  border-radius: 6px;
  background: linear-gradient(
    90deg,
    var(--surface-2) 25%,
    var(--line) 37%,
    var(--surface-2) 63%
  );
  background-size: 400% 100%;
  animation: shimmer 1.4s ease infinite;
}

.skeleton-lg {
  width: 6ch;
  height: 0.9em;
}

@keyframes shimmer {
  0% {
    background-position: 100% 0;
  }
  100% {
    background-position: 0 0;
  }
}

/* Mobile nav */
@media (max-width: 760px) {
  .nav-toggle {
    display: block;
    margin-left: auto;
  }

  .nav {
    margin-left: 0;
  }

  .nav-menu {
    position: absolute;
    left: 0;
    right: 0;
    top: 64px;
    flex-direction: column;
    gap: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    padding: var(--sp-1) var(--sp-3) var(--sp-3);
    display: none;
  }

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

  .nav-menu li {
    border-top: 1px solid var(--line);
  }

  .nav-menu a {
    display: block;
    padding: var(--sp-2) 0;
  }

  .header-actions .btn-ghost {
    display: none;
  }

  .expander-summary {
    grid-template-columns: 1fr;
    gap: var(--sp-1);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .skeleton {
    animation: none;
  }

  * {
    transition: none !important;
  }
}