/* ============================================================
   Cabin Room Studio - Base
   Reset, typography, ambient background layers, a11y.
   ============================================================ */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;          /* sticky nav clearance */
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: var(--leading-body);
  color: var(--text);
  background: var(--ink-800);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

button, input, textarea, select { font: inherit; color: inherit; }
button { background: none; border: none; cursor: pointer; }

ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; }


/* ---- Typography -------------------------------------- */

h1, h2, h3 { font-family: var(--font-display); font-weight: 400; line-height: var(--leading-tight); }
h4, h5, h6 { font-family: var(--font-display); font-weight: 400; line-height: var(--leading-snug); }

.u-eyebrow {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--amber-500);
}
.u-eyebrow::before {
  content: ""; width: 18px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--amber-500));
}

.u-lead { font-size: var(--step-1); color: var(--text-muted); font-weight: 300; }
.u-muted { color: var(--text-muted); }
.u-em { font-style: italic; color: var(--amber-500); }

/* gradient headline word */
.u-grad {
  background: linear-gradient(100deg, var(--amber-400) 0%, var(--amber-500) 45%, var(--coast-400) 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}


/* ---- Layout helpers ----------------------------------- */

.u-container { width: 100%; max-width: var(--w-page); margin-inline: auto; padding-inline: var(--sp-6); }
.u-narrow { max-width: var(--w-narrow); margin-inline: auto; }

.section { position: relative; z-index: var(--z-content); padding-block: var(--section-y); }
.section-head { text-align: center; margin-bottom: var(--sp-10); }
.section-head h2 { font-size: var(--step-4); margin-block: var(--sp-4) var(--sp-3); }
.section-head p { color: var(--text-muted); font-weight: 300; max-width: 52ch; margin-inline: auto; }

/* soft gradient seam between sections instead of a hard colour band */
.section--seam::before {
  content: ""; position: absolute; inset-inline: 0; top: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--line) 22%, var(--line) 78%, transparent);
}


/* ---- Ambient background layers ------------------------ */

/* Faint dot grid, always present. ::after is the same grid in
   amber, revealed only inside a mask that follows the cursor. */
.dot-field {
  position: fixed; inset: 0; z-index: var(--z-bg);
  pointer-events: none;
  background-image: radial-gradient(circle at 1px 1px, rgba(255, 255, 255, 0.055) 1px, transparent 0);
  background-size: 26px 26px;
}
.dot-field::after {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(circle at 1px 1px, var(--amber-500) 1px, transparent 0);
  background-size: 26px 26px;
  -webkit-mask-image: radial-gradient(circle 180px at var(--px) var(--py), #000 0%, rgba(0,0,0,0.5) 45%, transparent 75%);
          mask-image: radial-gradient(circle 180px at var(--px) var(--py), #000 0%, rgba(0,0,0,0.5) 45%, transparent 75%);
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease-out);
}
.dot-field.is-live::after { opacity: 1; }

/* Soft colour that trails further behind the cursor -> depth */
.aurora {
  position: fixed; inset: 0; z-index: var(--z-bg);
  pointer-events: none;
  background:
    radial-gradient(circle 320px at var(--ax) var(--ay), rgba(var(--amber-rgb), 0.20), transparent 62%),
    radial-gradient(circle 200px at var(--ax) var(--ay), rgba(var(--coast-rgb), 0.14), transparent 58%);
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease-out);
}
.aurora.is-live { opacity: 1; }

/* Static baked noise - a raster, NOT a live filter. Stops the
   flat dark gradients reading as flat. */
.grain {
  position: fixed; inset: 0; z-index: var(--z-grain);
  pointer-events: none; opacity: 0.032;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* No cursor effects where there is no cursor. */
@media (hover: none), (pointer: coarse) {
  .dot-field::after, .aurora { display: none; }
}


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

.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
  transition-delay: calc(var(--i, 0) * 70ms);
}
.reveal.is-visible { opacity: 1; transform: none; }


/* ---- Accessibility ------------------------------------ */

.skip-link {
  position: absolute; left: var(--sp-4); top: var(--sp-4);
  z-index: 999;
  transform: translateY(-200%);
  padding: var(--sp-3) var(--sp-5);
  background: var(--amber-500); color: var(--text-on-accent);
  border-radius: var(--r-full); font-weight: 700; font-size: var(--step--1);
  transition: transform var(--dur-fast) var(--ease-out);
}
.skip-link:focus { transform: translateY(0); }

:focus-visible {
  outline: 2px solid var(--amber-500);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

.u-visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap; border: 0;
}

::selection { background: rgba(var(--amber-rgb), 0.3); color: var(--text); }


/* ---- Scrollbar ---------------------------------------- */

* { scrollbar-width: thin; scrollbar-color: var(--ink-500) transparent; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--ink-900); }
::-webkit-scrollbar-thumb { background: var(--ink-500); border-radius: var(--r-full); border: 2px solid var(--ink-900); }
::-webkit-scrollbar-thumb:hover { background: var(--line); }


/* ---- Reduced motion ----------------------------------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .reveal { opacity: 1; transform: none; }
}