/* ==========================================================================
   Rivosus Ranch - base.css
   Design tokens, reset, typography, and shared chrome (header / footer).
   Palette derives from the Rivosus Ranch Seal (deep pine) and the warm
   parchment of the 1917 archival photography.
   ========================================================================== */

/* ---------- 1. Tokens ---------------------------------------------------- */

:root {
  /* Pine - sampled from Rivosus Ranch Seal.png */
  --pine-900: #071E13;
  --pine-800: #0B2E1D;
  --pine-700: #0E3B24;
  --pine-600: #16512F;
  --moss-500: #2F5D43;
  --sage-300: #8FA898;
  --sage-200: #B7C7BB;

  /* Parchment - warm, nostalgic paper */
  --parchment-50:  #FBF7EF;
  --parchment-100: #F3EDE1;
  --parchment-200: #E7DECB;
  --parchment-300: #D8CCB4;

  /* Stone - the masonry itself.
     -500 is tuned for dark grounds, -600 for light ones. Using -500 on
     parchment lands at 3.4:1, which fails WCAG AA for the small letterspaced
     labels it would carry, so light sections use -600 (5.4:1). */
  --stone-400: #A9A498;
  --stone-500: #8A8579;
  --stone-600: #6B665C;
  --stone-700: #4A4740;

  /* Ink + brass accent (brass echoes the gold of the RPI mark) */
  --ink-900: #1A1813;
  --ink-700: #38342B;
  --brass-500: #C39A4E;
  --brass-400: #D9B673;

  /* Corporate mark */
  --rpi-blue: #1349A0;
  --rpi-gold: #D2A745;

  /* Semantic */
  --bg: var(--parchment-50);
  --fg: var(--ink-900);
  --fg-muted: var(--ink-700);
  --rule: rgba(26, 24, 19, 0.16);
  --rule-light: rgba(255, 255, 255, 0.18);

  /* Type */
  --font-display: "Cormorant Garamond", "Iowan Old Style", "Palatino Linotype",
                  Palatino, Georgia, "Times New Roman", serif;
  --font-body: "Spectral", Georgia, "Times New Roman", serif;

  /* Fluid type scale */
  --t-hero:  clamp(3rem, 1.6rem + 6.4vw, 8.25rem);
  --t-xxl:   clamp(2.25rem, 1.5rem + 3.2vw, 4.25rem);
  --t-xl:    clamp(1.75rem, 1.3rem + 1.9vw, 2.875rem);
  --t-lg:    clamp(1.375rem, 1.18rem + 0.85vw, 1.875rem);
  --t-md:    clamp(1.0625rem, 1.01rem + 0.28vw, 1.1875rem);
  --t-sm:    0.9375rem;
  --t-xs:    0.8125rem;
  --t-label: 0.6875rem;

  /* Rhythm */
  --gutter: clamp(1.25rem, 0.8rem + 2.2vw, 3.5rem);
  --section-y: clamp(4.5rem, 3rem + 7vw, 10rem);
  --measure: 64ch;
  --wrap: 1280px;
  --wrap-narrow: 860px;

  --radius: 2px;
  --shadow-plate: 0 1px 2px rgba(26,24,19,.08), 0 18px 45px -22px rgba(26,24,19,.45);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 2. Reset ----------------------------------------------------- */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: var(--t-md);
  font-weight: 300;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, svg, video { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4 { margin: 0; font-weight: 400; line-height: 1.08; }
p { margin: 0 0 1.35em; }
p:last-child { margin-bottom: 0; }
a { color: inherit; }
ul, ol { margin: 0; padding: 0; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
[hidden] { display: none !important; }

:focus-visible {
  outline: 2px solid var(--brass-500);
  outline-offset: 3px;
}

::selection { background: var(--pine-700); color: var(--parchment-50); }

/* ---------- 3. Typography ------------------------------------------------ */

.t-hero { font-family: var(--font-display); font-size: var(--t-hero); font-weight: 300; line-height: 0.92; letter-spacing: -0.02em; }
.t-xxl  { font-family: var(--font-display); font-size: var(--t-xxl);  font-weight: 300; line-height: 1.02; letter-spacing: -0.015em; }
.t-xl   { font-family: var(--font-display); font-size: var(--t-xl);   font-weight: 300; line-height: 1.1; }
.t-lg   { font-family: var(--font-display); font-size: var(--t-lg);   font-weight: 400; line-height: 1.22; }

/* Eyebrow / kicker - letterspaced caps with a rule */
.eyebrow {
  font-family: var(--font-body);
  font-size: var(--t-label);
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--stone-600);
  margin: 0 0 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.9rem;
}
.eyebrow::before {
  content: "";
  width: 2.25rem;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
  flex: none;
}
.eyebrow--center { justify-content: center; }
.eyebrow--center::after {
  content: "";
  width: 2.25rem;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
  flex: none;
}
.eyebrow--plain::before, .eyebrow--plain::after { display: none; }

.lede {
  font-size: clamp(1.1875rem, 1.05rem + 0.6vw, 1.5rem);
  line-height: 1.6;
  font-weight: 300;
  color: var(--fg-muted);
}

.prose { max-width: var(--measure); }

.drop-cap::first-letter {
  font-family: var(--font-display);
  font-size: 3.6em;
  line-height: 0.82;
  float: left;
  padding: 0.06em 0.12em 0 0;
  color: var(--pine-700);
  font-weight: 400;
}

/* ---------- 4. Layout ---------------------------------------------------- */

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.wrap--narrow { max-width: var(--wrap-narrow); }

.section { padding-block: var(--section-y); position: relative; }
.section--tight { padding-block: clamp(3rem, 2rem + 4vw, 6rem); }

.section--pine { background: var(--pine-800); color: var(--parchment-100); }
.section--pine .eyebrow { color: var(--sage-300); }
.section--pine .lede { color: var(--sage-200); }

.section--parchment { background: var(--parchment-100); }

.rule { height: 1px; background: var(--rule); border: 0; margin: 0; }
.rule--light { background: var(--rule-light); }

/* Hairline paper grain - warmth without an image request */
.grain::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.035;
  background-image:
    repeating-linear-gradient(0deg, rgba(0,0,0,.6) 0 1px, transparent 1px 3px),
    repeating-linear-gradient(90deg, rgba(0,0,0,.6) 0 1px, transparent 1px 4px);
  mix-blend-mode: multiply;
}

/* ---------- 4b. Shared components ----------------------------------------- */
/* Used by both the public pages and the portal, so they live here rather
   than in site.css (which the portal does not load). */

/* Two-column split that collapses on narrow screens */
.split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(2.5rem, 6vw, 6rem);
  align-items: center;
}
.split--wide-left  { grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); }
.split--wide-right { grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); }

@media (max-width: 900px) {
  .split, .split--wide-left, .split--wide-right {
    grid-template-columns: 1fr;
    gap: 2.75rem;
  }
}

/* Framed photographic plate */
.plate { margin: 0; }
.plate__frame {
  position: relative;
  overflow: hidden;
  background: var(--parchment-200);
  padding: clamp(0.5rem, 1vw, 0.75rem);
  box-shadow: var(--shadow-plate);
  border-radius: var(--radius);
}
.plate__frame img {
  width: 100%;
  display: block;
  transition: transform 1.4s var(--ease), filter 1.4s var(--ease);
}
.plate--archival .plate__frame img { filter: sepia(0.22) contrast(1.04) brightness(1.02); }
.plate__frame:hover img { transform: scale(1.035); }

.plate--clickable .plate__frame { cursor: zoom-in; }
.plate--clickable .plate__frame::after {
  content: "View";
  position: absolute;
  right: clamp(1rem, 2vw, 1.5rem);
  bottom: clamp(1rem, 2vw, 1.5rem);
  padding: 0.5rem 1rem;
  background: rgba(7, 30, 19, 0.82);
  color: var(--parchment-100);
  font-size: var(--t-label);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity .4s var(--ease), transform .4s var(--ease);
  pointer-events: none;
}
.plate--clickable .plate__frame:hover::after { opacity: 1; transform: none; }

.plate__caption {
  margin-top: 1.1rem;
  display: flex;
  gap: 1rem;
  align-items: baseline;
  font-size: var(--t-sm);
  color: var(--fg-muted);
  line-height: 1.5;
}
.section--pine .plate__caption { color: var(--sage-200); }
.plate__year {
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: 0.02em;
  color: var(--pine-700);
  flex: none;
}
.section--pine .plate__year { color: var(--brass-400); }

/* ---------- 5. Buttons --------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.95rem 1.9rem;
  font-family: var(--font-body);
  font-size: var(--t-label);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-decoration: none;
  border: 1px solid currentColor;
  border-radius: var(--radius);
  color: var(--pine-700);
  background: transparent;
  transition: background-color .45s var(--ease), color .45s var(--ease),
              border-color .45s var(--ease), transform .45s var(--ease);
}
.btn:hover { background: var(--pine-700); border-color: var(--pine-700); color: var(--parchment-50); }
.btn:active { transform: translateY(1px); }

.btn--light { color: var(--parchment-100); }
.btn--light:hover { background: var(--parchment-100); border-color: var(--parchment-100); color: var(--pine-800); }

.btn--solid { background: var(--pine-700); border-color: var(--pine-700); color: var(--parchment-50); }
.btn--solid:hover { background: var(--pine-900); border-color: var(--pine-900); }

.btn--brass { color: var(--pine-900); background: var(--brass-500); border-color: var(--brass-500); }
.btn--brass:hover { background: var(--brass-400); border-color: var(--brass-400); color: var(--pine-900); }

.btn[disabled] { opacity: .45; pointer-events: none; }

/* Quiet text link with an animated underline */
.link {
  text-decoration: none;
  background-image: linear-gradient(currentColor, currentColor);
  background-size: 0% 1px;
  background-repeat: no-repeat;
  background-position: 0 100%;
  transition: background-size .4s var(--ease);
  padding-bottom: 2px;
  border-bottom: 1px solid var(--rule);
}
.link:hover { background-size: 100% 1px; }

/* ---------- 6. Header / navigation --------------------------------------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  padding-top: env(safe-area-inset-top, 0px);
  transition: background-color .5s var(--ease), box-shadow .5s var(--ease),
              border-color .5s var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header__inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 1.15rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  transition: padding .5s var(--ease);
}

.brand { display: flex; align-items: center; gap: 0.85rem; text-decoration: none; flex: none; }
.brand__seal {
  width: 44px; height: 44px;
  flex: none;
  transition: width .5s var(--ease), height .5s var(--ease), filter .5s var(--ease);
}
.brand__text { display: flex; flex-direction: column; line-height: 1; }
.brand__name {
  font-family: var(--font-display);
  font-size: 1.3rem;
  letter-spacing: 0.04em;
  color: var(--pine-700);
  transition: color .5s var(--ease);
}
.brand__sub {
  font-size: 0.6rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--stone-500);
  margin-top: 0.34rem;
  transition: color .5s var(--ease);
}

.nav { display: flex; align-items: center; gap: clamp(1rem, 2.2vw, 2.4rem); }
.nav__list { display: flex; align-items: center; gap: clamp(1rem, 2.2vw, 2.4rem); list-style: none; }
.nav__link {
  font-size: var(--t-label);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-700);
  position: relative;
  padding-block: 0.4rem;
  transition: color .4s var(--ease);
  white-space: nowrap;
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .45s var(--ease);
}
.nav__link:hover::after, .nav__link[aria-current="true"]::after { transform: scaleX(1); transform-origin: left; }

/* Over-hero (transparent) state */
.site-header[data-mode="over"] .brand__name,
.site-header[data-mode="over"] .nav__link { color: var(--parchment-100); }
.site-header[data-mode="over"] .brand__sub { color: var(--sage-300); }
.site-header[data-mode="over"] .brand__seal { filter: brightness(0) invert(1) opacity(.92); }

/* Pinned (scrolled) state */
.site-header[data-mode="pinned"] {
  background: rgba(251, 247, 239, 0.94);
  backdrop-filter: blur(14px) saturate(1.1);
  -webkit-backdrop-filter: blur(14px) saturate(1.1);
  border-bottom-color: var(--rule);
}
.site-header[data-mode="pinned"] .site-header__inner { padding-block: 0.72rem; }
.site-header[data-mode="pinned"] .brand__seal { width: 34px; height: 34px; }

/* Mobile toggle */
.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  margin-right: -10px;
  position: relative;
  z-index: 2;
}
.nav-toggle__bar {
  display: block;
  width: 22px; height: 1.5px;
  background: var(--ink-900);
  transition: transform .4s var(--ease), opacity .3s var(--ease), background-color .4s var(--ease);
}
.site-header[data-mode="over"] .nav-toggle__bar { background: var(--parchment-100); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar { background: var(--parchment-100); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

@media (max-width: 880px) {
  .nav-toggle { display: flex; }
  .nav {
    position: fixed;
    inset: 0;
    background: var(--pine-800);
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    gap: 0;
    padding: 6rem var(--gutter) 3rem;
    clip-path: circle(0% at calc(100% - 3rem) 2.5rem);
    transition: clip-path .7s var(--ease);
    pointer-events: none;
    overflow-y: auto;
  }
  .nav[data-open="true"] { clip-path: circle(150% at calc(100% - 3rem) 2.5rem); pointer-events: auto; }
  .nav__list { flex-direction: column; align-items: flex-start; gap: 0; width: 100%; }
  .nav__list li { width: 100%; border-bottom: 1px solid var(--rule-light); }
  .nav__link {
    display: block;
    width: 100%;
    padding: 1.35rem 0;
    font-family: var(--font-display);
    font-size: 1.85rem;
    letter-spacing: 0.01em;
    text-transform: none;
    font-weight: 300;
    color: var(--parchment-100) !important;
  }
  .nav__link::after { display: none; }
  .nav .btn { margin-top: 2.25rem; align-self: flex-start; }
  body[data-nav-open="true"] { overflow: hidden; }
}

/* ---------- 7. Footer ---------------------------------------------------- */

.site-footer {
  background: var(--pine-900);
  color: var(--sage-200);
  padding-block: clamp(3.5rem, 2.5rem + 4vw, 6rem) 2rem;
  font-size: var(--t-sm);
}
.site-footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(2, minmax(0, 1fr));
  gap: clamp(2rem, 4vw, 4rem);
  align-items: start;
}
.site-footer__seal { width: 84px; height: 84px; margin-bottom: 1.5rem; filter: brightness(0) invert(1) opacity(.82); }
.site-footer__mark { font-family: var(--font-display); font-size: 1.65rem; color: var(--parchment-100); letter-spacing: 0.03em; }
.site-footer h4 {
  font-family: var(--font-body);
  font-size: var(--t-label);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sage-300);
  margin-bottom: 1.15rem;
  font-weight: 500;
}
.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: 0.7rem; }
.site-footer a { text-decoration: none; opacity: .88; transition: opacity .3s var(--ease); }
.site-footer a:hover { opacity: 1; }

.site-footer__base {
  margin-top: clamp(2.5rem, 4vw, 4rem);
  padding-top: 1.75rem;
  border-top: 1px solid var(--rule-light);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  font-size: var(--t-xs);
  color: var(--sage-300);
}
.rpi-credit { display: flex; align-items: center; gap: 0.7rem; text-decoration: none; }
.rpi-credit img { width: 26px; height: 26px; }
.rpi-credit span { font-size: var(--t-xs); letter-spacing: 0.1em; }

@media (max-width: 720px) {
  .site-footer__grid { grid-template-columns: 1fr; gap: 2.5rem; }
}

/* ---------- 8. Scroll reveal --------------------------------------------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 1s var(--ease), transform 1s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].is-revealed { opacity: 1; transform: none; }

/* ---------- 9. Lightbox --------------------------------------------------- */

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(7, 30, 19, 0.96);
  display: grid;
  place-items: center;
  padding: clamp(1.25rem, 5vw, 4rem);
  opacity: 0;
  pointer-events: none;
  transition: opacity .45s var(--ease);
}
.lightbox[data-open="true"] { opacity: 1; pointer-events: auto; }
.lightbox__figure { max-width: 1400px; margin: 0; }
.lightbox__img {
  max-height: 78vh;
  width: auto;
  margin-inline: auto;
  box-shadow: 0 40px 90px -30px rgba(0,0,0,.8);
}
.lightbox__cap {
  margin-top: 1.5rem;
  text-align: center;
  color: var(--sage-200);
  font-size: var(--t-sm);
  letter-spacing: 0.04em;
}
.lightbox__close {
  position: absolute;
  top: clamp(1rem, 3vw, 2.25rem);
  right: clamp(1rem, 3vw, 2.25rem);
  width: 48px; height: 48px;
  border: 1px solid var(--rule-light);
  border-radius: 50%;
  color: var(--parchment-100);
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  transition: background-color .35s var(--ease);
}
.lightbox__close:hover { background: rgba(255,255,255,.1); }

/* ---------- 10. Utilities & motion preferences ---------------------------- */

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

.skip-link {
  position: absolute;
  top: -120px; left: var(--gutter);
  z-index: 300;
  background: var(--pine-700);
  color: var(--parchment-50);
  padding: 0.9rem 1.4rem;
  font-size: var(--t-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  text-decoration: none;
  transition: top .3s var(--ease);
}
.skip-link:focus { top: calc(env(safe-area-inset-top, 0px) + 1rem); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
}