/* ===========================================================================
   Inca Studio — base.css  (shipped with every site, loaded BEFORE styles.css)

   This file is the MECHANICAL layer only: reset, layout primitives, motion
   plumbing, accessibility, responsive guards. It contains NO identity: every
   colour, font and shape is read from a custom property that styles.css must
   define. styles.css loads after this file, so any rule here can be overridden
   with a selector of equal specificity.

   styles.css MUST define these tokens on :root —
     --ground --ink --brand --accent --surface --line --ink-soft
     --font-display --font-body
     --radius --radius-lg
   and MAY override any --space-* / --step-* / --container / --section-pad.
   =========================================================================== */

/* --- tokens: mechanical defaults, all overridable ------------------------- */
:root {
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 40px;
  --space-6: 64px;
  --space-7: 96px;
  --space-8: 140px;

  --step--1: clamp(0.82rem, 0.79rem + 0.15vw, 0.9rem);
  --step-0:  clamp(1rem, 0.96rem + 0.2vw, 1.09rem);
  --step-1:  clamp(1.2rem, 1.12rem + 0.4vw, 1.45rem);
  --step-2:  clamp(1.5rem, 1.34rem + 0.8vw, 2rem);
  --step-3:  clamp(1.9rem, 1.6rem + 1.5vw, 2.8rem);
  --step-4:  clamp(2.3rem, 1.7rem + 3vw, 3.6rem);
  --step-5:  clamp(3rem, 1.8rem + 6vw, 6.5rem);

  --container: 1200px;
  --container-narrow: 68ch;
  --gutter: clamp(20px, 5vw, 40px);
  --section-pad: clamp(40px, 8vw, 96px);
  --section-pad-tight: clamp(32px, 6vw, 64px);

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 600ms;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  overflow-x: clip;           /* clip, not hidden — keeps position:sticky alive */
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  overflow-x: clip;
  min-height: 100svh;
  font-family: var(--font-body, system-ui, sans-serif);
  font-size: var(--step-0);
  line-height: 1.6;
  color: var(--ink, #16130f);
  background: var(--ground, #fff);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body.no-scroll { overflow: hidden; }

h1, h2, h3, h4 {
  font-family: var(--font-display, var(--font-body, system-ui, sans-serif));
  line-height: 1.08;
  text-wrap: balance;
  overflow-wrap: break-word;
}
h1 { font-size: var(--step-5); letter-spacing: -0.02em; }
h2 { font-size: var(--step-4); letter-spacing: -0.015em; }
h3 { font-size: var(--step-2); }
p, li { overflow-wrap: break-word; }
p { text-wrap: pretty; }

img, picture, video, canvas, svg { display: block; max-width: 100%; }
img, video { height: auto; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
ul[class], ol[class] { list-style: none; padding: 0; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
:target { scroll-margin-top: clamp(72px, 12vh, 120px); }

/* --- accessibility -------------------------------------------------------- */
:focus-visible {
  outline: 3px solid var(--accent, #c1440e);
  outline-offset: 3px;
  border-radius: 2px;
}
.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap;
}
.skip-link {
  position: absolute; top: -100%; left: var(--space-3); z-index: 999;
  padding: var(--space-2) var(--space-3);
  background: var(--ink, #16130f); color: var(--ground, #fff);
  border-radius: var(--radius, 10px);
}
.skip-link:focus-visible { top: var(--space-3); }

/* --- layout primitives ---------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--narrow { max-width: var(--container-narrow); }
.container--wide { max-width: 1560px; }

.section { padding-block: var(--section-pad); }
.section--tight { padding-block: var(--section-pad-tight); }
.section--flush { padding-block: 0; }
.section--bleed { padding-inline: 0; }

.stack > * + * { margin-block-start: var(--flow, var(--space-4)); }
.stack--tight { --flow: var(--space-2); }
.stack--loose { --flow: var(--space-5); }

.cluster {
  display: flex; flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}
.grid-auto {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fit, minmax(min(var(--col, 280px), 100%), 1fr));
}
.split {
  display: grid;
  gap: var(--space-5);
  align-items: center;
  grid-template-columns: 1fr;
}
@media (min-width: 860px) {
  .split { grid-template-columns: var(--split, 1fr 1fr); }
  .split--55 { --split: 55fr 45fr; }
  .split--60 { --split: 60fr 40fr; }
}

/* photo frames: aspect-ratio wrapper + zoom mask */
.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: var(--ratio, 3 / 2);
  border-radius: var(--radius-lg, var(--radius, 10px));
}
.media > img, .media > picture, .media > picture > img, .media > video {
  width: 100%; height: 100%;
  object-fit: cover;
}
.media--square { --ratio: 1 / 1; }
.media--portrait { --ratio: 4 / 5; }
.media--wide { --ratio: 16 / 9; }
.media--flush { border-radius: 0; }

/* text over photos always needs a scrim */
.scrim { position: relative; isolation: isolate; }
.scrim::after {
  content: ""; position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(var(--scrim-dir, to top),
    rgb(0 0 0 / var(--scrim-a, 0.62)), rgb(0 0 0 / 0) 65%);
  pointer-events: none;
}
.scrim > * { position: relative; z-index: 2; }

/* --- tables & wide content never scroll the page ------------------------- */
.scroll-x { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table { border-collapse: collapse; width: 100%; }
td, th { text-align: start; }
.tabular { font-variant-numeric: tabular-nums; }

/* --- filmstrip / snap galleries ------------------------------------------ */
.filmstrip {
  display: flex;
  gap: var(--space-3);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  padding-block-end: var(--space-2);
}
.filmstrip::-webkit-scrollbar { display: none; }
.filmstrip > * { flex: 0 0 auto; scroll-snap-align: start; }
@media (max-width: 640px) {
  .filmstrip > * { flex-basis: 78vw; }   /* visible peek of the next card */
}

/* --- marquee -------------------------------------------------------------- */
.marquee {
  display: flex;
  overflow: hidden;
  width: 100%;
  max-width: 100vw;
  user-select: none;
}
.marquee__track {
  display: flex;
  flex: 0 0 auto;
  gap: var(--space-5);
  padding-inline-end: var(--space-5);
  min-width: 100%;
  will-change: transform;
  animation: inca-marquee var(--marquee-dur, 28s) linear infinite;
}
.marquee:hover .marquee__track { animation-play-state: var(--marquee-hover, running); }
@keyframes inca-marquee { to { transform: translate3d(-100%, 0, 0); } }

/* --- sticky mobile conversion bar ---------------------------------------- */
.mobile-bar {
  position: fixed;
  inset: auto 0 0 0;
  z-index: 90;
  display: none;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  padding-bottom: calc(var(--space-2) + env(safe-area-inset-bottom));
  background: var(--surface, var(--ground, #fff));
  border-top: 1px solid var(--line, rgb(0 0 0 / 0.12));
  transform: translateY(110%);
  transition: transform 320ms var(--ease-out);
}
.mobile-bar > * { flex: 1 1 0; text-align: center; }
.mobile-bar.is-visible { transform: none; }
@media (max-width: 640px) { .mobile-bar { display: flex; } }

/* --- drawer (mobile nav) -------------------------------------------------- */
.drawer {
  position: fixed;
  inset: 0;
  z-index: 100;
  visibility: hidden;
  opacity: 0;
  transition: opacity 280ms var(--ease-out), visibility 280ms;
}
.drawer.is-open { visibility: visible; opacity: 1; }
.drawer__panel {
  position: absolute;
  inset-block: 0;
  inset-inline-end: 0;
  width: min(88vw, 400px);
  overflow-y: auto;
  padding: var(--space-5) var(--gutter);
  background: var(--ground, #fff);
  transform: translateX(100%);
  transition: transform 320ms var(--ease-out);
}
.drawer.is-open .drawer__panel { transform: none; }
.drawer__scrim { position: absolute; inset: 0; background: rgb(0 0 0 / 0.5); }

/* --- lightbox ------------------------------------------------------------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: grid;
  place-items: center;
  padding: var(--gutter);
  background: rgb(0 0 0 / 0.9);
  visibility: hidden;
  opacity: 0;
  transition: opacity 240ms var(--ease-out), visibility 240ms;
}
.lightbox.is-open { visibility: visible; opacity: 1; }
.lightbox img { max-height: 86svh; width: auto; }

/* --- forms ---------------------------------------------------------------- */
label { display: block; font-size: var(--step--1); }
input, select, textarea {
  width: 100%;
  padding: var(--space-3);
  background: var(--surface, transparent);
  color: inherit;
  border: 1px solid var(--line, rgb(0 0 0 / 0.2));
  border-radius: var(--radius, 10px);
}
textarea { min-height: 8rem; resize: vertical; }
input:user-invalid, textarea:user-invalid { border-color: #b3261e; }

/* --- buttons: structure only, colour comes from styles.css ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 48px;
  padding: 0 var(--space-4);
  border-radius: var(--radius, 10px);
  font-weight: 600;
  line-height: 1;
  text-align: center;
  text-decoration: none;
  transition: transform 160ms var(--ease-out), background-color 200ms, color 200ms;
}
.btn:active { transform: translateY(1px); }

/* --- motion plumbing ------------------------------------------------------
   Reveal classes only hide content when JS is present (html.js) AND the visitor
   has not asked for reduced motion. With JS off the page renders complete.
   app.js adds .is-in; the safety sweep force-completes anything left hidden.  */
@media (prefers-reduced-motion: no-preference) {
  html.js .reveal {
    opacity: 0;
    transform: translate3d(0, var(--reveal-y, 28px), 0);
    transition:
      opacity var(--dur) var(--ease-out) var(--reveal-delay, 0ms),
      transform var(--dur) var(--ease-out) var(--reveal-delay, 0ms);
  }
  html.js .reveal.is-in { opacity: 1; transform: none; }

  html.js .reveal-stagger > * {
    opacity: 0;
    transform: translate3d(0, 24px, 0);
    transition: opacity var(--dur) var(--ease-out), transform var(--dur) var(--ease-out);
  }
  html.js .reveal-stagger.is-in > * { opacity: 1; transform: none; }
  html.js .reveal-stagger.is-in > :nth-child(2) { transition-delay: 80ms; }
  html.js .reveal-stagger.is-in > :nth-child(3) { transition-delay: 160ms; }
  html.js .reveal-stagger.is-in > :nth-child(4) { transition-delay: 240ms; }
  html.js .reveal-stagger.is-in > :nth-child(5) { transition-delay: 320ms; }
  html.js .reveal-stagger.is-in > :nth-child(n + 6) { transition-delay: 400ms; }

  html.js .mask-reveal { clip-path: inset(0 0 100% 0); transition: clip-path 900ms var(--ease-out); }
  html.js .mask-reveal.is-in { clip-path: inset(0 0 0 0); }
}

/* hover flourishes only where hovering is real */
@media (hover: hover) and (pointer: fine) {
  .hover-lift { transition: transform 260ms var(--ease-out), box-shadow 260ms var(--ease-out); }
  .hover-lift:hover { transform: translateY(-6px); }
  .hover-zoom img { transition: transform 700ms var(--ease-out); }
  .hover-zoom:hover img { transform: scale(1.06); }
}

@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;
  }
}

/* --- cross-document view transitions ------------------------------------- */
@view-transition { navigation: auto; }
@media (prefers-reduced-motion: no-preference) {
  ::view-transition-old(root) { animation: inca-vt-out 180ms var(--ease-out) both; }
  ::view-transition-new(root) { animation: inca-vt-in 320ms var(--ease-out) both; }
}
@keyframes inca-vt-out { to { opacity: 0; } }
@keyframes inca-vt-in { from { opacity: 0; transform: translateY(8px); } }

/* --- sunset mode ----------------------------------------------------------
   The mechanism lives here; styles.css defines what dusk actually shifts by
   redeclaring its own tokens inside `html.dusk { … }`.                       */
html.dusk { color-scheme: dark; }
html, html.dusk { transition: none; }
html.js body { transition: background-color 600ms var(--ease-out), color 600ms var(--ease-out); }
.dusk-toggle {
  position: fixed;
  inset-block-end: calc(var(--space-4) + env(safe-area-inset-bottom));
  inset-inline-end: var(--space-4);
  z-index: 80;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--surface, var(--ground, #fff));
  border: 1px solid var(--line, rgb(0 0 0 / 0.15));
}
@media (max-width: 640px) {
  .dusk-toggle { inset-block-end: calc(76px + env(safe-area-inset-bottom)); }
}

/* --- print ---------------------------------------------------------------- */
@media print {
  .mobile-bar, .dusk-toggle, .drawer, .lightbox, nav { display: none !important; }
  body { color: #000; background: #fff; }
}