/* ============================================
   TUMBLEFERN, INC. — Design Tokens & Base Styles
   ============================================ */

:root,
[data-theme='light'] {
  /* Surfaces */
  --color-bg: #faf9f6;
  --color-surface: #ffffff;
  --color-surface-2: #f2f3ee;
  --color-border: #e1e3db;
  --color-divider: #eaebe4;

  /* Text */
  --color-text: #14181a;
  --color-text-muted: #5c625b;
  --color-text-faint: #9aa096;
  --color-text-inverse: #faf9f6;

  /* Primary accent — fern green */
  --color-primary: #1f6f52;
  --color-primary-hover: #17563f;
  --color-primary-active: #0f3f2e;
  --color-primary-highlight: #dceae1;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

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

  --shadow-sm: 0 1px 2px oklch(0.2 0.02 150 / 0.06);
  --shadow-md: 0 8px 24px oklch(0.2 0.02 150 / 0.08);
  --shadow-lg: 0 20px 48px oklch(0.2 0.02 150 / 0.14);

  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1180px;

  --font-display: 'Cabinet Grotesk', 'Helvetica Neue', sans-serif;
  --font-body: 'Satoshi', 'Helvetica Neue', sans-serif;
}

[data-theme='dark'] {
  --color-bg: #0d1210;
  --color-surface: #131813;
  --color-surface-2: #181d18;
  --color-border: #262b25;
  --color-divider: #1e2320;

  --color-text: #e7e9e4;
  --color-text-muted: #9ba296;
  --color-text-faint: #656c61;
  --color-text-inverse: #0d1210;

  --color-primary: #56b587;
  --color-primary-hover: #73c99e;
  --color-primary-active: #8fdab1;
  --color-primary-highlight: #1c2b22;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 8px 24px oklch(0 0 0 / 0.35);
  --shadow-lg: 0 20px 48px oklch(0 0 0 / 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --color-bg: #0d1210;
    --color-surface: #131813;
    --color-surface-2: #181d18;
    --color-border: #262b25;
    --color-divider: #1e2320;
    --color-text: #e7e9e4;
    --color-text-muted: #9ba296;
    --color-text-faint: #656c61;
    --color-text-inverse: #0d1210;
    --color-primary: #56b587;
    --color-primary-hover: #73c99e;
    --color-primary-active: #8fdab1;
    --color-primary-highlight: #1c2b22;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
    --shadow-md: 0 8px 24px oklch(0 0 0 / 0.35);
    --shadow-lg: 0 20px 48px oklch(0 0 0 / 0.5);
  }
}

:root {
  --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, 3.25rem);
  --text-hero: clamp(2.75rem, 1rem + 6vw, 6.5rem);

  --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;
}

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

html {
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-20);
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-interactive), color var(--transition-interactive);
}

img,
svg {
  display: block;
  max-width: 100%;
}

h1, h2, h3, h4 {
  text-wrap: balance;
  line-height: 1.1;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
}

p, li {
  text-wrap: pretty;
  max-width: 68ch;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  cursor: pointer;
  background: none;
  border: none;
  font: inherit;
  color: inherit;
}

::selection {
  background: oklch(from var(--color-primary) l c h / 0.25);
  color: var(--color-text);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

/* ---------- Layout helpers ---------- */
.wrap {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-5), 4vw, var(--space-12));
}

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

/* ---------- Header ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-divider);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.header--hidden {
  transform: translateY(-100%);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.brand__mark {
  width: 34px;
  height: 34px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.brand__word {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-lg);
  letter-spacing: -0.01em;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav__links {
  display: flex;
  gap: var(--space-6);
  list-style: none;
}

.nav__links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-interactive);
}

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

.theme-toggle {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  transition: color var(--transition-interactive), border-color var(--transition-interactive), background var(--transition-interactive);
}

.theme-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-text-faint);
  background: var(--color-surface-2);
}

@media (max-width: 640px) {
  .nav { gap: var(--space-3); }
  .nav__links { gap: var(--space-4); }
  .nav__links a { font-size: var(--text-xs); }
  .brand__word { font-size: var(--text-base); }
}

@media (max-width: 380px) {
  .brand__word { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding-block: clamp(var(--space-20), 14vw, var(--space-32)) clamp(var(--space-16), 8vw, var(--space-24));
  overflow: hidden;
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-6);
}

.hero__eyebrow::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
}

.hero h1 {
  font-size: var(--text-hero);
  margin-bottom: var(--space-6);
}

.hero h1 em {
  font-style: normal;
  color: var(--color-primary);
}

.hero__lede {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 56ch;
  margin-bottom: var(--space-10);
}

.hero__actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero__frond {
  position: absolute;
  top: -8%;
  right: -10%;
  width: min(52vw, 640px);
  color: var(--color-primary);
  opacity: 0.08;
  z-index: 0;
  pointer-events: none;
}

[data-theme='dark'] .hero__frond {
  opacity: 0.14;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) .hero__frond {
    opacity: 0.14;
  }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: background var(--transition-interactive), color var(--transition-interactive), border-color var(--transition-interactive), transform var(--transition-interactive);
}

.btn:active {
  transform: translateY(1px);
}

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

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

.btn--ghost {
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn--ghost:hover {
  border-color: var(--color-text-faint);
  background: var(--color-surface-2);
}

/* ---------- Section headings ---------- */
.section-head {
  max-width: 640px;
  margin-bottom: clamp(var(--space-10), 6vw, var(--space-16));
}

.section-head__eyebrow {
  display: block;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.section-head h2 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-4);
}

.section-head p {
  color: var(--color-text-muted);
  font-size: var(--text-base);
}

/* ---------- About ---------- */
.about {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(var(--space-8), 6vw, var(--space-20));
  align-items: start;
}

.about__grid p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

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

.stat {
  border-left: 2px solid var(--color-primary);
  padding-left: var(--space-5);
}

.stat__value {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

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

@media (max-width: 800px) {
  .about__grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- Ventures ---------- */
.ventures__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

.venture-card {
  position: relative;
  padding: clamp(var(--space-8), 4vw, var(--space-10));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-surface);
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive), transform var(--transition-interactive);
}

.venture-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.venture-card__icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  margin-bottom: var(--space-6);
}

.venture-card__icon svg {
  width: 24px;
  height: 24px;
}

.venture-card__tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}

.venture-card h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
}

.venture-card p {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  margin-bottom: var(--space-5);
}

.venture-card__list {
  list-style: none;
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.venture-card__list li {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.venture-card__list li::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-primary);
  flex-shrink: 0;
  transform: translateY(-2px);
}

.venture-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
}

.venture-card__link svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-interactive);
}

.venture-card:hover .venture-card__link svg {
  transform: translateX(3px);
}

.venture-card--soon {
  background: var(--color-surface-2);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
}

.status-pill::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
}

@media (max-width: 800px) {
  .ventures__grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- Contact ---------- */
.contact {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
}

.contact__inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(var(--space-8), 6vw, var(--space-20));
  align-items: center;
}

.contact h2 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-5);
}

.contact p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}

.contact__list {
  display: grid;
  gap: var(--space-5);
  list-style: none;
}

.contact__list li {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.contact__list a {
  font-size: var(--text-base);
  font-weight: 500;
  transition: color var(--transition-interactive);
}

.contact__list a:hover {
  color: var(--color-primary);
}

.contact__icon {
  width: 42px;
  height: 42px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
}

.contact__icon svg {
  width: 20px;
  height: 20px;
}

.contact__card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-8), 4vw, var(--space-10));
  background: var(--color-surface-2);
}

.contact__card__label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}

.contact__card h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-4);
}

.contact__card p {
  font-size: var(--text-sm);
  margin-bottom: 0;
}

@media (max-width: 800px) {
  .contact__inner {
    grid-template-columns: 1fr;
  }
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-10);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.footer__mark {
  width: 20px;
  height: 20px;
  color: var(--color-text-faint);
}

.footer__meta {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer__legal {
  display: flex;
  gap: var(--space-5);
  list-style: none;
}

.footer__legal a {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  transition: color var(--transition-interactive);
}

.footer__legal a:hover {
  color: var(--color-text-muted);
}

/* ---------- Legal pages ---------- */
.legal {
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
}

.legal__wrap {
  width: 100%;
  max-width: 72ch;
  margin-inline: auto;
  padding-inline: clamp(var(--space-5), 4vw, var(--space-12));
}

.legal__back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
  transition: color var(--transition-interactive);
}

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

.legal__meta {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  margin-bottom: var(--space-10);
}

.legal article h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-4);
}

.legal article h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  margin-top: var(--space-10);
  margin-bottom: var(--space-3);
}

.legal article p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.legal article ul {
  margin: 0 0 var(--space-4);
  padding-left: var(--space-6);
  color: var(--color-text-muted);
}

.legal article li {
  margin-bottom: var(--space-2);
}

.legal article a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.legal article strong {
  color: var(--color-text);
}

.legal article hr {
  border: none;
  border-top: 1px solid var(--color-divider);
  margin-block: var(--space-10);
}

.legal article em {
  display: block;
  font-style: normal;
  font-size: var(--text-sm);
  color: var(--color-text-faint);
}