/* ============================================================================
   SEUIL · BASE — the total field (every surface is the vault), chrome, cursor,
   preloader, shared type & controls. Shared by index.html and item.html.
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: auto; }
body {
  min-height: 100dvh;
  font-family: var(--font-text);
  font-size: var(--step-0);
  line-height: var(--leading-body);
  color: var(--ink);
  background: var(--shadow-deep);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; }
::selection { background: var(--brass); color: var(--shadow-vault); }

/* ---- THE TOTAL FIELD: garnet ground + a raking vault-light that leans to you */
.field {
  position: fixed; inset: 0; z-index: -2;
  background:
    radial-gradient(120% 90% at 50% 120%, var(--shadow-deep) 0%, transparent 60%),
    radial-gradient(100% 100% at 50% 30%, var(--oxblood-lit) 0%, var(--oxblood) 45%, var(--shadow-deep) 100%);
}
/* the vault-light — a soft amber pool that follows the pointer with lag */
.vault-light {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background: radial-gradient(38vmax 38vmax at var(--lx, 58%) var(--ly, 32%),
              color-mix(in srgb, var(--amber) 26%, transparent) 0%,
              color-mix(in srgb, var(--amber) 8%, transparent) 34%,
              transparent 66%);
  mix-blend-mode: screen;
  transition: opacity 1.2s var(--ease-vault);
  will-change: background;
}
.is-emerald .vault-light { /* past admission: the hall warms & cools to candle-amber */
  background: radial-gradient(60vmax 50vmax at 50% 40%,
              color-mix(in srgb, var(--candle) 30%, transparent) 0%,
              color-mix(in srgb, var(--emerald) 24%, transparent) 55%, transparent 80%);
}
/* film grain — analog imperfection, anti-AI-stock (SVG noise, static) */
.grain {
  position: fixed; inset: 0; z-index: var(--z-grain); pointer-events: none;
  opacity: 0.10; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---- THE KEY-LIGHT CURSOR (desktop pointer only) ----------------------- */
.cursor { display: none; }
@media (hover: hover) and (pointer: fine) {
  body.has-cursor { cursor: none; }
  body.has-cursor a, body.has-cursor button, body.has-cursor [data-hit] { cursor: none; }
  .cursor {
    display: block; position: fixed; top: 0; left: 0; z-index: var(--z-cursor);
    pointer-events: none; transform: translate(-50%, -50%);
    mix-blend-mode: screen; will-change: transform;
  }
  .cursor__glow {
    width: 34px; height: 34px; border-radius: 50%;
    background: radial-gradient(circle, color-mix(in srgb, var(--amber) 70%, transparent) 0%, transparent 68%);
    transition: width var(--d-fast) var(--ease-hand), height var(--d-fast) var(--ease-hand);
  }
  .cursor__core {
    position: absolute; top: 50%; left: 50%; width: 5px; height: 5px; border-radius: 50%;
    background: var(--amber-hi); transform: translate(-50%, -50%);
  }
  body.cursor-key .cursor__glow { width: 58px; height: 58px; }   /* over the iris: a key-light */
  body.cursor-hit .cursor__glow { width: 46px; height: 46px;
    background: radial-gradient(circle, color-mix(in srgb, var(--brass-hi) 80%, transparent) 0%, transparent 66%); }
}

/* ---- PRELOADER: the vault waking, its first light finding you ----------- */
.preloader {
  position: fixed; inset: 0; z-index: 100; display: grid; place-items: center;
  background: var(--shadow-vault);
  transition: opacity 900ms var(--ease-vault), visibility 900ms;
}
.preloader.is-done { opacity: 0; visibility: hidden; }
.preloader__mark {
  font-family: var(--font-display); font-weight: 600;
  font-size: var(--step-2); letter-spacing: var(--tracking-incised);
  color: var(--brass); text-transform: uppercase;
  opacity: 0; animation: wake 1.6s var(--ease-vault) 0.2s forwards;
}
.preloader__slit {
  width: 2px; height: 0; margin: var(--s-3) auto 0;
  background: linear-gradient(var(--amber-hi), var(--amber));
  box-shadow: 0 0 18px 4px color-mix(in srgb, var(--amber) 60%, transparent);
  animation: slit 1.6s var(--ease-vault) 0.4s forwards;
}
@keyframes wake { to { opacity: 1; } }
@keyframes slit { 0%{height:0} 60%{height:110px} 100%{height:80px} }
@media (prefers-reduced-motion: reduce) {
  .preloader__mark { animation: none; opacity: 1; }
  .preloader__slit { animation: none; height: 80px; }
}

/* ---- CHROME: near-invisible ------------------------------------------- */
.chrome {
  position: fixed; top: 0; left: 0; right: 0; z-index: var(--z-chrome);
  display: flex; align-items: center; justify-content: space-between;
  padding: clamp(1rem, 2.4vw, 1.9rem) var(--page-x);
  mix-blend-mode: screen;
  transition: opacity var(--d-mid) var(--ease-vault), transform var(--d-mid) var(--ease-vault);
}
.chrome[data-hidden="true"] { opacity: 0; transform: translateY(-8px); pointer-events: none; }
.chrome__mark {
  font-family: var(--font-display); font-weight: 700; font-size: var(--step-1);
  letter-spacing: var(--tracking-incised); text-transform: uppercase; color: var(--brass-hi);
}
.chrome__mark small { display:block; font-size: 0.42em; letter-spacing: var(--tracking-label);
  color: var(--ink-faint); font-weight: 400; margin-top: 2px; }
.chrome__enter {
  font-family: var(--font-text); font-size: var(--step--1);
  letter-spacing: var(--tracking-label); text-transform: uppercase; color: var(--ink-soft);
  padding: 0.6em 0.2em; position: relative;
}
.chrome__enter::after {
  content:""; position:absolute; left:0; right:100%; bottom: 0.3em; height:1px;
  background: var(--brass-hi); transition: right var(--d-mid) var(--ease-hand);
}
.chrome__enter:hover::after { right: 0; }

/* ---- SHARED TYPE ------------------------------------------------------- */
.incised {
  font-family: var(--font-display); font-weight: 600; text-transform: uppercase;
  letter-spacing: var(--tracking-incised); line-height: var(--leading-tight);
  color: var(--brass-hi);
  text-shadow: 0 1px 0 color-mix(in srgb, var(--brass-lo) 60%, transparent),
               0 0 24px color-mix(in srgb, var(--amber) 18%, transparent);
}
.label {
  font-family: var(--font-text); font-size: var(--step--1); font-weight: 500;
  letter-spacing: var(--tracking-label); text-transform: uppercase; color: var(--ink-faint);
}
.tnum { font-feature-settings: "tnum" 1, "lnum" 1; font-variant-numeric: tabular-nums lining-nums; }
.measure { max-width: var(--measure); }

/* ---- THE ADMITTANCE CONTROL (buttons that read as engraved brass) ------- */
.admit {
  --b: var(--brass);
  display: inline-flex; align-items: center; gap: 0.8em;
  font-family: var(--font-display); font-weight: 600; text-transform: uppercase;
  letter-spacing: var(--tracking-incised); font-size: var(--step-0); color: var(--amber-hi);
  padding: 1em 2em; border: 1px solid var(--b);
  background: linear-gradient(color-mix(in srgb, var(--brass) 12%, transparent), transparent);
  position: relative; overflow: hidden; transition: color var(--d-fast) var(--ease-hand);
}
.admit::before { /* the light that sweeps through when you cross */
  content:""; position:absolute; inset:0; transform: translateX(-101%);
  background: linear-gradient(100deg, transparent, color-mix(in srgb, var(--amber) 40%, transparent), transparent);
  transition: transform var(--d-slow) var(--ease-vault);
}
.admit:hover::before, .admit:focus-visible::before { transform: translateX(101%); }
.admit:hover { color: var(--shadow-vault); background: var(--amber); }
.admit[data-ghost] { border-color: var(--hairline); color: var(--ink-soft); padding: 0.7em 1.4em; font-size: var(--step--1); }

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

/* ---- REVEAL (IntersectionObserver-driven; degrades to visible) ---------- */
/* content is visible by default; JS "arms" the reveal only once it can animate it
   (so a failed/slow script never hides content — and audits paint correctly) */
html.reveal-armed [data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity 900ms var(--ease-vault), transform 900ms var(--ease-vault); }
html.reveal-armed [data-reveal].is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { [data-reveal] { transition-duration: 1ms; } }

.sr-only { position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap; border:0; }
.skip { position:fixed; left:50%; top:-60px; transform:translateX(-50%); z-index:200;
  background:var(--shadow-vault); color:var(--amber); padding:.6em 1.2em; border:1px solid var(--brass);
  transition: top var(--d-fast); }
.skip:focus { top:12px; }

/* ---- THE IRIS (shared shell; JS mounts the brass blades) --------------- */
.iris { position: relative; aspect-ratio: 1; width: 100%; isolation: isolate; }
.iris__well {
  position: absolute; inset: 6%; z-index: 0; overflow: hidden; border-radius: 50%;
  clip-path: circle(6% at 50% 50%); opacity: 0; will-change: clip-path, opacity;
  background: var(--shadow-vault);
}
.iris__blades { position: absolute; inset: 0; z-index: 2; width: 100%; height: 100%;
  filter: drop-shadow(0 6px 24px rgba(0,0,0,0.55)); }
.iris__whisper, .iris__slit { pointer-events: none; }
.iris__whisper {
  position: absolute; left: 50%; bottom: -2.2em; transform: translateX(-50%); z-index: 3;
  font-size: var(--step--1); letter-spacing: var(--tracking-label); text-transform: uppercase;
  color: var(--amber); opacity: 0.7; transition: opacity var(--d-mid) var(--ease-vault);
}
.iris.is-open .iris__whisper { opacity: 0; }
body.is-idle-gift .cursor__glow { width: 66px; height: 66px; }

/* ---- PROCEDURAL MATERIAL PLATES (no photography, never AI-stock) -------- */
.plate { position: absolute; inset: 0; background-color: var(--shadow-vault); }
.plate::after { /* thread/analog grain over every material */
  content:""; position:absolute; inset:0; opacity:.5; mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
/* the atelier in shadow: hanging cloth + a raking amber light */
.plate--atelier {
  background:
    radial-gradient(60% 80% at 62% 22%, color-mix(in srgb,var(--amber) 34%,transparent), transparent 60%),
    repeating-linear-gradient(96deg, #2a0a10 0 22px, #1c0509 22px 46px),
    linear-gradient(180deg, var(--oxblood) 0%, var(--shadow-vault) 100%);
}
/* charcoal storm wool, oxblood at the hem */
.plate--wool {
  background:
    linear-gradient(0deg, color-mix(in srgb,var(--garnet) 40%,transparent) 0%, transparent 24%),
    repeating-linear-gradient(45deg, #26262b 0 3px, #1b1b20 3px 6px),
    repeating-linear-gradient(-45deg, rgba(255,255,255,.03) 0 3px, transparent 3px 6px),
    #202025;
}
/* sand-washed garnet silk, a fall of light down the bias */
.plate--silk {
  background:
    linear-gradient(115deg, transparent 20%, color-mix(in srgb,var(--amber) 26%,transparent) 42%, transparent 60%),
    linear-gradient(200deg, var(--garnet-hi) 0%, var(--garnet) 45%, #3f0913 100%);
}
/* brushed brass / horology */
.plate--brass {
  background:
    linear-gradient(100deg, transparent 30%, rgba(255,243,208,.5) 48%, transparent 62%),
    repeating-linear-gradient(90deg, #a9863a 0 2px, #c9a659 2px 4px, #8a6c2c 4px 6px),
    #9c7c34;
}
/* the porter's lamp: smoked glass with a warm core */
.plate--amber {
  background:
    radial-gradient(38% 44% at 50% 52%, var(--amber-hi) 0%, var(--amber) 22%, color-mix(in srgb,var(--brass) 60%,transparent) 42%, transparent 66%),
    radial-gradient(120% 120% at 50% 50%, #241318 0%, var(--shadow-vault) 70%);
}
/* a wax seal (footer) */
.plate--seal {
  background:
    radial-gradient(50% 50% at 42% 38%, color-mix(in srgb,var(--brass-hi) 55%,transparent), transparent 55%),
    radial-gradient(60% 60% at 50% 50%, var(--garnet-hi), #4a0d16 60%, #2a0810 100%);
}