/* ============================================================
   COCANA — DESIGNED HUMAN STATES
   Design system. ACSS-style layout naming + BEM components.
   OKLCH color, rem/clamp/calc, no !important.
   ============================================================ */

/* ---- 1. TOKENS ------------------------------------------- */
:root {
  /* Core palette (OKLCH) */
  --black:        oklch(0.14 0.004 60);   /* near-black, faint warm */
  --black-deep:   oklch(0.09 0.004 60);   /* true depth for ENTER */
  --ink:          oklch(0.20 0.004 60);   /* text on light */
  --ink-soft:     oklch(0.38 0.004 60);   /* secondary text on light */
  --ivory:        oklch(0.972 0.008 85);  /* light section bg, low-chroma */
  --ivory-soft:   oklch(0.95 0.010 85);   /* card on ivory */
  --line-light:   oklch(0.86 0.012 85);   /* hairline on ivory */
  --line-dark:    oklch(1 0 0 / 0.14);    /* hairline on black */

  --paper:        oklch(0.97 0.006 85);   /* text on black (warm white) */
  --paper-soft:   oklch(0.97 0.006 85 / 0.66);

  /* Gold ramp */
  --gold:         oklch(0.80 0.105 84);   /* primary gold */
  --gold-deep:    oklch(0.70 0.115 78);   /* richer gold */
  --gold-bright:  oklch(0.90 0.085 92);   /* highlight */
  --gold-soft:    oklch(0.80 0.105 84 / 0.18);
  --gold-metal:   linear-gradient(160deg, var(--gold-bright) 0%, var(--gold-deep) 46%, var(--gold) 70%, var(--gold-bright) 100%);

  /* State accents */
  --st-original:  oklch(0.82 0.13 82);    /* gold */
  --st-limitless: oklch(0.70 0.16 245);   /* blue */
  --st-desire:    oklch(0.60 0.20 22);    /* deep red */
  --st-dream:     oklch(0.62 0.18 300);   /* violet */

  /* Typography */
  --font-display: "Cinzel", "Times New Roman", serif;
  --font-body:    "Jost", system-ui, sans-serif;

  --step--1: clamp(0.78rem, 0.74rem + 0.2vw, 0.88rem);
  --step-0:  clamp(0.95rem, 0.90rem + 0.25vw, 1.05rem);
  --step-1:  clamp(1.20rem, 1.10rem + 0.5vw, 1.45rem);
  --step-2:  clamp(1.55rem, 1.35rem + 1.0vw, 2.10rem);
  --step-3:  clamp(2.05rem, 1.70rem + 1.8vw, 3.10rem);
  --step-4:  clamp(2.70rem, 2.10rem + 3.0vw, 4.60rem);
  --step-5:  clamp(3.40rem, 2.40rem + 5.0vw, 6.00rem);

  /* Spacing scale */
  --space-3xs: 0.25rem;
  --space-2xs: 0.5rem;
  --space-xs:  0.75rem;
  --space-s:   1rem;
  --space-m:   1.5rem;
  --space-l:   2.5rem;
  --space-xl:  4rem;
  --space-2xl: 6rem;
  --space-3xl: 9rem;

  /* Structure */
  --width-content: 78rem;
  --width-text:    42rem;
  --radius:        0.4rem;
  --radius-l:      0.7rem;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);     /* quint */
  --ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
  --dur-1: 0.4s;
  --dur-2: 0.7s;
  --dur-3: 1.1s;

  /* Z scale */
  --z-base: 1;
  --z-sticky: 100;
  --z-nav: 200;
  --z-overlay: 300;
}

/* ---- 2. RESET -------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  font-family: var(--font-body);
  font-size: var(--step-0);
  font-weight: 300;
  line-height: 1.65;
  color: var(--ink);
  background: var(--ivory);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, picture, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul { list-style: none; padding: 0; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: 0.02em;
  text-wrap: balance;
}

::selection { background: var(--gold-soft); color: var(--ink); }

/* ---- 3. LAYOUT PRIMITIVES (ACSS-style) ------------------ */
.section { padding-block: var(--space-2xl); position: relative; }
.section--tight { padding-block: var(--space-xl); }
.section--flush { padding-block: 0; }

.container {
  width: min(100% - var(--space-l), var(--width-content));
  margin-inline: auto;
}
.container--text { max-width: var(--width-text); }

.content > * + * { margin-block-start: var(--space-s); }
.flow > * + * { margin-block-start: var(--space-m); }

.cluster { display: flex; flex-wrap: wrap; gap: var(--space-s); align-items: center; }
.center { display: grid; place-items: center; text-align: center; }

:is(.theme-dark, .theme-deep) { background: var(--black); color: var(--paper); }
:is(.theme-dark, .theme-deep) h1, :is(.theme-dark, .theme-deep) h2, :is(.theme-dark, .theme-deep) h3 { color: var(--paper); }
.theme-deep { background: var(--black-deep); color: var(--paper); }

/* ---- 4. TYPE HELPERS ------------------------------------ */
.eyebrow {
  font-family: var(--font-body);
  font-size: var(--step--1);
  font-weight: 400;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--gold-deep);
}
:is(.theme-dark, .theme-deep) .eyebrow { color: var(--gold); }

.display { font-size: var(--step-4); letter-spacing: 0.01em; }
.display--xl { font-size: var(--step-5); }
.lede { font-size: var(--step-1); font-weight: 300; line-height: 1.5; max-width: 34ch; }
.prose { max-width: 65ch; text-wrap: pretty; }
.gold { color: var(--gold-deep); }
:is(.theme-dark, .theme-deep) .gold { color: var(--gold); }
.muted { color: var(--ink-soft); }
:is(.theme-dark, .theme-deep) .muted { color: var(--paper-soft); }

/* gold rule ornament */
.rule {
  width: clamp(2.5rem, 6vw, 5rem); height: 1px;
  background: var(--gold); border: 0; opacity: 0.7;
}
.rule--node { position: relative; }
.rule--node::after {
  content: ""; position: absolute; inset-block-start: 50%; inset-inline-start: 50%;
  width: 0.45rem; height: 0.45rem; transform: translate(-50%, -50%) rotate(45deg);
  border: 1px solid var(--gold);
}

/* ---- 5. BUTTONS ----------------------------------------- */
.btn {
  --pad-i: 2.4rem;
  display: inline-flex; align-items: center; justify-content: center; gap: 0.7rem;
  font-family: var(--font-body); font-size: var(--step--1); font-weight: 400;
  letter-spacing: 0.32em; text-transform: uppercase;
  padding: 1.05rem var(--pad-i);
  position: relative; overflow: hidden;
  transition: color var(--dur-1) var(--ease-out);
}
.btn--gold { background: var(--gold-metal); color: var(--black); }
.btn--gold::before {
  content: ""; position: absolute; inset: 0; background: var(--black);
  transform: translateY(101%); transition: transform var(--dur-1) var(--ease-out); z-index: 0;
}
.btn--gold:hover { color: var(--gold); }
.btn--gold:hover::before { transform: translateY(0); }
.btn--gold > * { position: relative; z-index: 1; }
.btn__label { position: relative; z-index: 1; }

.btn--ghost {
  color: var(--paper); border: 1px solid var(--line-dark);
}
.btn--ghost:hover { border-color: var(--gold); color: var(--gold); }
.theme-light .btn--ghost { color: var(--ink); border-color: var(--line-light); }

/* arrow */
.btn__arrow { transition: transform var(--dur-1) var(--ease-out); }
.btn:hover .btn__arrow { transform: translateX(0.3rem); }

/* ---- 6. HEADER / NAV ------------------------------------ */
.site-header {
  position: fixed; inset-block-start: 0; inset-inline: 0; z-index: var(--z-nav);
  display: flex; align-items: center; justify-content: space-between;
  padding: clamp(1.1rem, 2vw, 1.8rem) clamp(1.25rem, 4vw, 3.5rem);
  transition: background var(--dur-2) var(--ease-out), padding var(--dur-2) var(--ease-out);
}
.site-header--scrolled {
  background: color-mix(in oklab, var(--black) 82%, transparent);
  backdrop-filter: blur(14px);
  padding-block: clamp(0.8rem, 1.4vw, 1.1rem);
}
.site-header.on-light:not(.site-header--scrolled) { color: var(--ink); }
.site-header.on-dark:not(.site-header--scrolled) { color: var(--paper); }
.site-header--scrolled { color: var(--paper); }

.brand {
  font-family: var(--font-display); font-size: clamp(1.15rem, 2.4vw, 1.6rem);
  letter-spacing: 0.4em; padding-inline-start: 0.4em; color: var(--gold);
}
.nav { display: flex; gap: clamp(1.2rem, 2.6vw, 2.6rem); align-items: center; }
.nav__link {
  font-size: var(--step--1); letter-spacing: 0.22em; text-transform: uppercase;
  position: relative; padding-block: 0.4rem;
}
.nav__link::after {
  content: ""; position: absolute; inset-block-end: 0; inset-inline-start: 0;
  width: 100%; height: 1px; background: currentColor;
  transform: scaleX(0); transform-origin: right; transition: transform var(--dur-1) var(--ease-out);
}
.nav__link:hover::after, .nav__link[aria-current="page"]::after { transform: scaleX(1); transform-origin: left; }
.nav__link[aria-current="page"] { color: var(--gold); }

.nav-toggle { display: none; }

@media (max-width: 52rem) {
  .nav-toggle { display: inline-flex; }
}

/* ---- 7. FOOTER ------------------------------------------ */
.site-footer { background: var(--black-deep); color: var(--paper-soft); padding-block: var(--space-xl); }
.site-footer__top { display: flex; flex-wrap: wrap; gap: var(--space-l); justify-content: space-between; align-items: flex-start; }
.site-footer__brand { font-family: var(--font-display); font-size: 1.5rem; letter-spacing: 0.4em; color: var(--gold); }
.site-footer__tag { font-size: var(--step--1); letter-spacing: 0.3em; text-transform: uppercase; margin-block-start: 0.6rem; }
.site-footer__nav { display: flex; flex-wrap: wrap; gap: var(--space-m); }
.site-footer__nav a { font-size: var(--step--1); letter-spacing: 0.2em; text-transform: uppercase; }
.site-footer__nav a:hover { color: var(--gold); }
.site-footer__fund { color: var(--gold); font-size: var(--step--1); letter-spacing: 0.18em; text-transform: uppercase; }
.site-footer__legal { margin-block-start: var(--space-l); padding-block-start: var(--space-m); border-block-start: 1px solid var(--line-dark); font-size: var(--step--1); opacity: 0.6; letter-spacing: 0.08em; }

/* ---- 7b. PAGE TRANSITIONS (View Transitions API) -------- */
@view-transition { navigation: auto; }
@media (prefers-reduced-motion: no-preference) {
  ::view-transition-old(root) { animation: vt-fade-out 0.42s var(--ease-out) both; }
  ::view-transition-new(root) { animation: vt-fade-in 0.55s var(--ease-out) both; }
  @keyframes vt-fade-out { to { opacity: 0; } }
  @keyframes vt-fade-in { from { opacity: 0; } }
  /* the brand wordmark persists across navigations */
  .brand { view-transition-name: brand-mark; }
}

/* ---- 8. REVEAL (progressive enhancement) ---------------- */
.reveal { opacity: 1; }
@media (prefers-reduced-motion: no-preference) {
  .js .reveal { opacity: 0; transform: translateY(1.6rem); transition: opacity var(--dur-3) var(--ease-out), transform var(--dur-3) var(--ease-out); }
  .js .reveal.is-in { opacity: 1; transform: none; }
  .js .reveal[data-delay="1"] { transition-delay: 0.08s; }
  .js .reveal[data-delay="2"] { transition-delay: 0.16s; }
  .js .reveal[data-delay="3"] { transition-delay: 0.24s; }
  .js .reveal[data-delay="4"] { transition-delay: 0.32s; }
}