/* ============================================================
   Modern Cincinnatus — design tokens & components
   Warm paper surfaces, ink text, muted forest-green accent.
   Display: Playfair Display (serif). Body: General Sans (sans).
   ============================================================ */

:root {
  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.75rem, 1rem + 5.6vw, 5.85rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 640px;
  --content-default: 1140px;
  --content-wide: 1200px;

  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'General Sans', 'Helvetica Neue', sans-serif;
}

:root,
[data-theme='light'] {
  /* Surfaces — warm paper */
  --color-bg: #f5f2ea;
  --color-surface: #faf8f2;
  --color-surface-2: #fdfcf9;
  --color-surface-offset: #eeeadd;
  --color-divider: #dfd9ca;
  --color-border: #d4cdbb;

  /* Text — warm ink */
  --color-text: #211e19;
  --color-text-muted: #6c6455;
  --color-text-faint: #a69f8f;
  --color-text-inverse: #f8f6f0;

  /* Accent — muted forest green */
  --color-primary: #3e5c4c;
  --color-primary-hover: #324a3d;
  --color-primary-active: #263a2f;
  --color-primary-highlight: #e1e8e3;

  --shadow-sm: 0 1px 2px oklch(0.25 0.02 95 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.25 0.02 95 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.25 0.02 95 / 0.12);
}

[data-theme='dark'] {
  --color-bg: #14130f;
  --color-surface: #1a1914;
  --color-surface-2: #1f1e18;
  --color-surface-offset: #24221b;
  --color-divider: #2a2820;
  --color-border: #3c392e;

  --color-text: #e9e3d3;
  --color-text-muted: #a39c89;
  --color-text-faint: #6b6656;
  --color-text-inverse: #1e1d17;

  --color-primary: #86ab96;
  --color-primary-hover: #9ac0a9;
  --color-primary-active: #afd0bc;
  --color-primary-highlight: #253830;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.25);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.35);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.45);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #14130f;
    --color-surface: #1a1914;
    --color-surface-2: #1f1e18;
    --color-surface-offset: #24221b;
    --color-divider: #2a2820;
    --color-border: #3c392e;
    --color-text: #e9e3d3;
    --color-text-muted: #a39c89;
    --color-text-faint: #6b6656;
    --color-text-inverse: #1e1d17;
    --color-primary: #86ab96;
    --color-primary-hover: #9ac0a9;
    --color-primary-active: #afd0bc;
    --color-primary-highlight: #253830;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.25);
    --shadow-md: 0 4px 12px oklch(0 0 0 / 0.35);
    --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.45);
  }
}

/* ---------- Layout scaffolding ---------- */

.container {
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: clamp(var(--space-4), 5vw, var(--space-8));
}

.container--narrow {
  max-width: var(--content-narrow);
}

section {
  padding-block: clamp(var(--space-16), 9vw, var(--space-32));
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.08);
}

.site-header__inner {
  position: relative;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding: var(--space-3) clamp(var(--space-4), 4vw, var(--space-8));
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
  text-decoration: none;
  margin-right: auto;
  min-height: 44px;
}

.brand__mark {
  color: var(--color-primary);
  flex-shrink: 0;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.0625rem;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.site-nav {
  display: none;
}

.site-nav.is-open {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 100%;
  left: clamp(var(--space-4), 4vw, var(--space-8));
  right: clamp(var(--space-4), 4vw, var(--space-8));
  margin-top: var(--space-2);
  background: var(--color-surface-2);
  border: 1px solid oklch(from var(--color-text) l c h / 0.1);
  border-radius: var(--radius-lg);
  padding: var(--space-2) var(--space-5);
  box-shadow: 0 12px 32px oklch(from var(--color-text) l c h / 0.14);
}

.site-nav.is-open a {
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.08);
}

.site-nav.is-open a:last-child {
  border-bottom: none;
}

@media (min-width: 860px) {
  .site-nav {
    display: flex;
    gap: var(--space-6);
    position: static;
    background: none;
    border: none;
    box-shadow: none;
    padding: 0;
  }

  .site-nav a {
    border-bottom: none !important;
  }
}

.site-nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  padding-block: var(--space-3);
}

@media (min-width: 860px) {
  .site-nav a {
    padding-block: var(--space-2);
  }
}

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

.site-nav .nav-cta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-primary);
  font-weight: 600;
}

.site-nav .nav-cta:hover {
  color: var(--color-primary-hover);
}

.nav-cta__icon {
  display: none;
  flex-shrink: 0;
}

@media (min-width: 860px) {
  .site-nav .nav-cta {
    width: 40px;
    height: 40px;
    justify-content: center;
    border-radius: var(--radius-full);
    color: var(--color-text-muted);
    font-weight: 400;
    padding: 0;
  }

  .site-nav .nav-cta:hover {
    color: var(--color-text);
    background: oklch(from var(--color-text) l c h / 0.06);
  }

  .nav-cta__icon {
    display: block;
  }

  .nav-cta__label {
    display: none;
  }
}

.nav-toggle {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  border: none;
  background: none;
  color: var(--color-text);
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
}

.nav-toggle:hover {
  background: oklch(from var(--color-text) l c h / 0.06);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: currentColor;
  position: absolute;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle span:nth-child(1) {
  transform: translateY(-5px);
}

.nav-toggle span:nth-child(3) {
  transform: translateY(5px);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(0) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(0) rotate(-45deg);
}

@media (min-width: 860px) {
  .nav-toggle {
    display: none;
  }
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
}

.theme-toggle:hover {
  color: var(--color-text);
  background: oklch(from var(--color-text) l c h / 0.06);
}

/* ---------- Hero ---------- */

.hero {
  padding-block: clamp(var(--space-20), 12vw, var(--space-32));
}

.hero__eyebrow {
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: var(--space-5);
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-3xl);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--color-primary);
  margin-bottom: var(--space-5);
}

.hero__byline {
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: clamp(var(--space-10), 6vw, var(--space-16));
}

.hero__manifesto {
  max-width: 62ch;
  display: grid;
  gap: var(--space-6);
}

.hero__manifesto p {
  font-size: var(--text-lg);
  line-height: 1.6;
  font-weight: 400;
  color: var(--color-text-muted);
}

/* ---------- Field image ---------- */

.field {
  padding-block: clamp(var(--space-8), 5vw, var(--space-12));
}

.field__figure {
  margin: 0;
}

.field__figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

/* ---------- Section headers ---------- */

.section-title {
  position: relative;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-xl);
  letter-spacing: -0.005em;
  color: var(--color-primary);
  margin-bottom: var(--space-6);
}

.chapter-mark {
  display: none;
}

@media (min-width: 1320px) {
  .chapter-mark {
    display: block;
    position: absolute;
    left: -3.75rem;
    top: 0.25em;
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: 500;
    letter-spacing: 0.08em;
    color: var(--color-text-faint);
  }
}

.section-lede {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 58ch;
  margin-bottom: var(--space-10);
}

/* ---------- Seeing the Trees / accordion ---------- */

.trees {
  background: var(--color-surface);
  border-block: 1px solid oklch(from var(--color-text) l c h / 0.07);
}

.accordion {
  display: grid;
  border-top: 1px solid oklch(from var(--color-text) l c h / 0.12);
}

.accordion details {
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.12);
}

.accordion summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-2);
  min-height: 44px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-lg);
  color: var(--color-primary);
}

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

.accordion summary h3 {
  font: inherit;
  line-height: inherit;
}

.accordion summary:hover {
  color: var(--color-primary);
}

.accordion summary:active {
  color: var(--color-primary-active);
}

.accordion__icon {
  margin-left: auto;
  flex-shrink: 0;
  color: var(--color-text-faint);
  transition: transform 260ms cubic-bezier(0.16, 1, 0.3, 1);
}

.accordion details[open] .accordion__icon {
  transform: rotate(45deg);
  color: var(--color-primary);
}

.accordion__body {
  padding: 0 var(--space-2) var(--space-8);
  max-width: 62ch;
  color: var(--color-text-muted);
}

.accordion__body p + p {
  margin-top: var(--space-4);
}

/* ---------- Ways to Grow ---------- */

#ways-to-grow {
  background: var(--color-surface);
  border-block: 1px solid oklch(from var(--color-text) l c h / 0.07);
}

/* ---------- Why We Should Talk ---------- */

#why-we-should-talk {
  background: var(--color-surface);
  border-block: 1px solid oklch(from var(--color-text) l c h / 0.07);
}

/* ---------- Getting to the Root ---------- */

.root-prose {
  display: grid;
  gap: var(--space-8);
  max-width: 62ch;
}

.root-prose__body {
  display: grid;
  gap: var(--space-6);
}

.root-prose .turn {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 500;
  line-height: 1.5;
  color: var(--color-text);
  padding-left: var(--space-6);
  border-left: 2px solid var(--color-primary);
  max-width: 56ch;
}

@media (min-width: 1024px) {
  .root-prose {
    grid-template-columns: minmax(0, 62ch) 1fr;
    align-items: center;
    column-gap: var(--space-12);
    max-width: none;
  }

  .root-prose .turn {
    font-size: var(--text-sm);
    font-style: italic;
    font-weight: 500;
    color: var(--color-text-muted);
    border-left: none;
    padding-left: var(--space-5);
    border-left: 1px solid oklch(from var(--color-text) l c h / 0.18);
    max-width: 30ch;
  }
}

/* ---------- Why I See It ---------- */

.why__grid {
  display: grid;
  gap: clamp(var(--space-10), 6vw, var(--space-16));
}

@media (min-width: 860px) {
  .why__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: start;
  }
}

.why__prose {
  display: grid;
  gap: var(--space-6);
  max-width: 62ch;
}

.why__figure {
  margin: 0;
}

@media (min-width: 860px) {
  .why__figure {
    position: sticky;
    top: calc(var(--space-16) + var(--space-4));
  }
}

.why__figure img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.why__figure figcaption {
  margin-top: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ---------- Why We Should Talk ---------- */

.talk__questions {
  display: grid;
  gap: var(--space-6);
  margin-block: var(--space-10) var(--space-12);
  counter-reset: talk-question;
}

.talk__questions li {
  counter-increment: talk-question;
  position: relative;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  font-style: italic;
  line-height: 1.4;
  color: var(--color-text);
  padding-left: var(--space-10);
  max-width: 58ch;
}

.talk__questions li::before {
  content: counter(talk-question, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.1em;
  font-family: var(--font-body);
  font-style: normal;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-text-faint);
}

.talk__close {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  max-width: none;
  margin-bottom: var(--space-10);
  padding-top: var(--space-8);
  border-top: 1px solid oklch(from var(--color-text) l c h / 0.12);
}

@media (min-width: 700px) {
  .talk__close {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-10);
  }
}

.talk__close p {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-primary);
  max-width: 32ch;
}

.cta-row {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-4);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-weight: 600;
  font-size: var(--text-sm);
  text-decoration: none;
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-md);
  min-height: 48px;
}

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

.btn-primary:active {
  background: var(--color-primary-active);
  transform: translateY(1px);
}

.privacy-note {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid oklch(from var(--color-text) l c h / 0.08);
  padding-block: var(--space-8);
}

.site-footer__inner {
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: clamp(var(--space-4), 5vw, var(--space-8));
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.site-footer a {
  color: var(--color-text-muted);
  text-decoration: none;
  padding-block: var(--space-2);
}

.site-footer a:hover {
  color: var(--color-text);
}

.site-footer .dot {
  color: var(--color-text-faint);
}

/* ---------- Scroll reveal ---------- */

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity 600ms cubic-bezier(0.16, 1, 0.3, 1),
    transform 600ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ---------- Skip link ---------- */

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: calc(-1 * var(--space-16));
  z-index: 100;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: top 180ms ease;
}

.skip-link:focus {
  top: var(--space-4);
}