/* ───────────────────────────────────────────────────────────────────────
   Nils Frahm — "Feutre"
   A vertical column of six felt hammers suspended in a dark hall.
   Palette: Feutre  ·  Type: Spectral + Geist Mono  ·  Grammar: La Colonne
   ─────────────────────────────────────────────────────────────────────── */

:root {
  /* Feutre palette */
  --blackbox: #0C0B09;
  --hall:     #110F0C;
  --linen:    #E8E2D4;
  --linen-2:  #CFC9BB;
  --ash:      #54524C;
  --whisper:  #8A8580;
  --ember:    #A84B2A;
  --felt:     #3A3833;

  /* type */
  --serif: 'Spectral', 'Times New Roman', serif;
  --mono:  'Geist Mono', 'SF Mono', 'Menlo', monospace;

  /* motion */
  --ease-slow: cubic-bezier(.22,.61,.36,1);
  --ease-strike: cubic-bezier(.55,.06,.22,1);

  /* geometry of the column */
  --hammer-w: 220px;
  --hammer-h: 88px;
  --column-radius: 520px;
}

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

html, body {
  height: 100%;
  background: var(--blackbox);
  color: var(--linen);
  font-family: var(--serif);
  font-weight: 300;
  letter-spacing: 0.01em;
  overflow: hidden;
  cursor: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@media (hover: none) { html, body { cursor: auto; } }

/* ─── The Hall (living texture background) ───────────────────────────── */
#hall {
  position: fixed; inset: 0; z-index: 0;
  pointer-events: none;
}
#hall svg { position: absolute; inset: 0; width: 100%; height: 100%; }

#grain {
  position: absolute; inset: 0;
  background-image:
    radial-gradient(1px 1px at 20% 30%, rgba(232,226,212,0.04) 50%, transparent 51%),
    radial-gradient(1px 1px at 70% 60%, rgba(232,226,212,0.03) 50%, transparent 51%),
    radial-gradient(1px 1px at 45% 85%, rgba(168,75,42,0.04) 50%, transparent 51%);
  background-size: 3px 3px, 5px 5px, 7px 7px;
  mix-blend-mode: screen;
  opacity: 0.6;
  animation: drift 14s linear infinite;
}
@keyframes drift {
  0% { transform: translate(0,0); }
  100% { transform: translate(-3px,-5px); }
}

/* ─── Loader ──────────────────────────────────────────────────────────── */
#loader {
  position: fixed; inset: 0; z-index: 50;
  background: var(--blackbox);
  display: grid;
  place-items: center;
  transition: opacity 1.4s var(--ease-slow), visibility 1.4s;
}
#loader.gone { opacity: 0; visibility: hidden; }

.loader-svg {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}

.loader-word {
  position: relative;
  font-family: var(--serif);
  font-weight: 200;
  font-size: clamp(3rem, 9vw, 7.5rem);
  letter-spacing: 0.22em;
  color: var(--linen);
  display: flex;
  gap: 0.04em;
  padding-top: 2em;
}
.loader-word span {
  display: inline-block;
  opacity: 0;
  transform: translateY(14px);
  filter: blur(8px);
  transition: opacity 900ms var(--ease-slow), transform 900ms var(--ease-slow), filter 900ms var(--ease-slow);
}
.loader-word.lit span { opacity: 0.92; transform: translateY(0); filter: blur(0); }
.loader-word.lit span:nth-child(1) { transition-delay: 120ms; }
.loader-word.lit span:nth-child(2) { transition-delay: 260ms; }
.loader-word.lit span:nth-child(3) { transition-delay: 400ms; }
.loader-word.lit span:nth-child(4) { transition-delay: 540ms; }
.loader-word.lit span:nth-child(5) { transition-delay: 680ms; }

.loader-meta {
  position: absolute;
  bottom: 2.4rem; left: 0; right: 0;
  display: flex; justify-content: center; gap: 2.2rem;
  font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.32em;
  color: var(--whisper); text-transform: uppercase;
  opacity: 0;
  transition: opacity 1.2s var(--ease-slow);
}
.loader-meta.lit { opacity: 0.8; }

/* ─── HUD ─────────────────────────────────────────────────────────────── */
#hud-top {
  position: fixed; top: 1.6rem; left: 1.8rem; right: 1.8rem;
  z-index: 20;
  display: flex; justify-content: space-between; align-items: flex-start;
  pointer-events: none;
  opacity: 0;
  transition: opacity 1.4s var(--ease-slow) 0.4s;
}
#hud-top.visible { opacity: 1; }

.hud-mark { display: flex; flex-direction: column; gap: 0.35rem; }
.hud-name {
  font-family: var(--serif); font-style: italic; font-weight: 400;
  font-size: 0.92rem; letter-spacing: 0.06em; color: var(--linen);
}
.hud-rule { width: 2.2rem; height: 1px; background: var(--ember); opacity: 0.7; }
.hud-kind {
  font-family: var(--mono); font-size: 0.58rem; letter-spacing: 0.32em;
  color: var(--whisper); text-transform: uppercase;
}

.hud-coord {
  display: flex; flex-direction: column; align-items: flex-end; gap: 0.25rem;
  font-family: var(--mono); font-size: 0.58rem; letter-spacing: 0.26em;
  color: var(--whisper); text-transform: uppercase;
}
.hud-coord > span { display: block; }
.hud-coord .hud-sep { display: none; }

/* ─── Stage (3D perspective) ──────────────────────────────────────────── */
#stage {
  position: fixed; inset: 0;
  z-index: 10;
  perspective: 2000px;
  perspective-origin: 50% 50%;
  opacity: 0;
  transition: opacity 1.8s var(--ease-slow) 0.6s;
}
#stage.visible { opacity: 1; }
#stage.struck { opacity: 0.08; pointer-events: none; transition: opacity 0.6s ease; }

#column {
  position: absolute;
  top: 50%; left: 50%;
  width: var(--hammer-w);
  height: var(--hammer-h);
  transform-style: preserve-3d;
  transform: translate(-50%, -50%) rotateX(0deg);
  transition: transform 1.2s var(--ease-slow);
  will-change: transform;
}

/* each hammer is a flat card placed on the circumference of a horizontal-axis cylinder */
.hammer {
  position: absolute;
  top: 0; left: 0;
  width: var(--hammer-w);
  height: var(--hammer-h);
  transform-style: preserve-3d;
  backface-visibility: hidden;
  cursor: none;
  background: transparent;
  border: 0;
  padding: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  -webkit-tap-highlight-color: transparent;
}
.hammer:focus { outline: none; }
.hammer:focus-visible { outline: 1px dashed var(--ember); outline-offset: 8px; }

.hammer-inner {
  position: relative;
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 0 0.6rem;
  transition: opacity 0.5s var(--ease-slow);
}

.hammer-shank {
  position: absolute;
  left: 50%; top: -180px;
  width: 1px; height: 180px;
  background: linear-gradient(to bottom, transparent, rgba(232,226,212,0.18));
  transform: translateX(-50%);
  opacity: 0;
  transition: opacity 0.6s var(--ease-slow);
}
.hammer.active .hammer-shank { opacity: 1; }

.hammer-head {
  position: relative;
  width: 64px; height: 64px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #5a564e, #2f2d28 70%, #1a1815);
  box-shadow:
    inset 0 0 0 1px rgba(232,226,212,0.06),
    inset 4px -4px 10px rgba(0,0,0,0.6),
    0 0 0 0 rgba(168,75,42,0);
  flex-shrink: 0;
  transition: box-shadow 0.8s var(--ease-slow), transform 0.4s var(--ease-slow);
}
.hammer-head::before {
  content: '';
  position: absolute; inset: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, rgba(232,226,212,0.18), transparent 55%);
  filter: url(#felt);
  opacity: 0.7;
}
.hammer-head::after {
  content: '';
  position: absolute; inset: -6px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(168,75,42,0.35) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.5s var(--ease-slow);
  pointer-events: none;
}
.hammer.active .hammer-head::after { opacity: 0.55; }
.hammer.hovered .hammer-head { transform: translateY(3px); }

.hammer-text {
  flex: 1;
  display: flex; flex-direction: column; gap: 0.25rem;
  opacity: 0;
  transition: opacity 0.7s var(--ease-slow);
}
.hammer.active .hammer-text { opacity: 1; }

.hammer-title {
  font-family: var(--serif);
  font-weight: 300;
  font-size: 1.35rem;
  letter-spacing: 0.08em;
  color: var(--linen);
  text-transform: uppercase;
  line-height: 1;
}
.hammer-meta {
  font-family: var(--mono); font-size: 0.58rem; letter-spacing: 0.32em;
  color: var(--whisper); text-transform: uppercase;
  display: flex; gap: 0.8rem;
}

/* strike animation: the head pulls, then slams */
.hammer.striking .hammer-head {
  animation: strike 520ms var(--ease-strike) forwards;
}
@keyframes strike {
  0%   { transform: translateY(0) scale(1); }
  30%  { transform: translateY(-22px) scale(1.02); }
  55%  { transform: translateY(14px) scale(0.92); box-shadow: inset 0 0 0 1px rgba(168,75,42,0.5), inset 4px -4px 10px rgba(0,0,0,0.6), 0 0 40px rgba(168,75,42,0.35); }
  100% { transform: translateY(0) scale(0.2); opacity: 0; }
}
.hammer.striking .hammer-text { opacity: 0; transition: opacity 250ms ease; }

/* ─── Active ring (eye level indicator) ──────────────────────────────── */
#ring {
  position: absolute;
  left: 50%; top: 50%;
  width: min(820px, 90vw); height: 200px;
  transform: translate(-50%, -50%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 1.6s var(--ease-slow) 0.8s;
}
#stage.visible #ring { opacity: 0.9; }

/* ─── Rail (vertical index) ───────────────────────────────────────────── */
#rail {
  position: fixed;
  right: 2.2rem; top: 50%;
  transform: translateY(-50%);
  z-index: 15;
  display: flex; flex-direction: column; gap: 0.9rem;
  opacity: 0;
  transition: opacity 1.6s var(--ease-slow) 0.9s;
}
#rail.visible { opacity: 1; }

.rail-item {
  display: flex; align-items: center; gap: 0.7rem;
  font-family: var(--mono); font-size: 0.58rem; letter-spacing: 0.32em;
  color: var(--whisper); text-transform: uppercase;
  cursor: none;
  background: none; border: none; padding: 0;
  transition: color 0.4s ease;
}
.rail-item .rail-num { min-width: 1.4em; text-align: right; }
.rail-item .rail-tick {
  width: 14px; height: 1px; background: var(--whisper);
  transition: width 0.4s var(--ease-slow), background 0.4s ease;
}
.rail-item.active { color: var(--linen); }
.rail-item.active .rail-tick { width: 38px; background: var(--ember); }
.rail-item:hover { color: var(--linen-2); }

/* ─── Detail fold ─────────────────────────────────────────────────────── */
#detail {
  position: fixed; inset: 0;
  z-index: 30;
  background: radial-gradient(ellipse at 50% 40%, rgba(26,22,18,0.8), rgba(12,11,9,0.98) 60%);
  opacity: 0;
  visibility: hidden;
  transition: opacity 1.4s var(--ease-slow), visibility 1.4s;
  display: grid;
  place-items: center;
  padding: 3rem;
}
#detail.open { opacity: 1; visibility: visible; transition-delay: 0.8s, 0s; }

.detail-inner {
  max-width: 780px;
  display: flex; flex-direction: column; gap: 1.4rem;
  transform: translateY(20px);
  opacity: 0;
  transition: transform 1.2s var(--ease-slow) 1s, opacity 1.2s var(--ease-slow) 1s;
}
#detail.open .detail-inner { transform: translateY(0); opacity: 1; }

.detail-meta {
  display: flex; align-items: center; gap: 1rem;
  font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.32em;
  color: var(--whisper); text-transform: uppercase;
}
.detail-meta .detail-sep { width: 2rem; height: 1px; background: var(--ember); }

#detail-title {
  font-family: var(--serif);
  font-weight: 200;
  font-size: clamp(3rem, 8vw, 6rem);
  letter-spacing: 0.06em;
  color: var(--linen);
  line-height: 1;
  text-transform: uppercase;
}

#detail-epigraph {
  font-family: var(--serif); font-style: italic; font-weight: 300;
  font-size: 1.1rem; letter-spacing: 0.02em;
  color: var(--linen-2);
  max-width: 52ch;
  line-height: 1.6;
}

.detail-body {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 2.4rem;
  margin-top: 0.6rem;
}
.detail-col { display: flex; flex-direction: column; gap: 0.5rem; }
.detail-label {
  font-family: var(--mono); font-size: 0.52rem; letter-spacing: 0.32em;
  color: var(--ember); text-transform: uppercase;
}
.detail-col p {
  font-family: var(--serif); font-weight: 300;
  font-size: 0.9rem; line-height: 1.6;
  color: var(--linen);
}

.detail-dots {
  display: flex; flex-wrap: wrap; gap: 0.9rem;
  margin-top: 0.6rem;
}
.detail-dots span {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--whisper);
  opacity: 0.5;
  transition: opacity 0.4s ease, transform 0.4s ease;
}
.detail-dots span.pulse { background: var(--ember); opacity: 1; transform: scale(1.8); }

.detail-close {
  margin-top: 1.2rem;
  align-self: flex-start;
  background: none; border: none;
  font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.32em;
  color: var(--whisper); text-transform: uppercase;
  cursor: none;
  display: flex; align-items: center; gap: 0.7rem;
  padding: 0.3rem 0;
  transition: color 0.4s ease;
}
.detail-close::before {
  content: ''; width: 28px; height: 1px;
  background: var(--whisper);
  transition: width 0.4s var(--ease-slow), background 0.4s ease;
}
.detail-close:hover { color: var(--linen); }
.detail-close:hover::before { width: 52px; background: var(--ember); }

/* ─── Canvas particles ────────────────────────────────────────────────── */
#particles {
  position: fixed; inset: 0;
  z-index: 25;
  pointer-events: none;
  mix-blend-mode: screen;
}

/* ─── Cursor ──────────────────────────────────────────────────────────── */
#cursor {
  position: fixed; top: 0; left: 0;
  width: 60px; height: 60px;
  margin-left: -30px; margin-top: -54px; /* tip anchors at mouse point */
  pointer-events: none;
  z-index: 100;
  transition: transform 120ms var(--ease-slow);
  mix-blend-mode: normal;
}
#cursor svg { width: 100%; height: 100%; }
#cursor.hover #cur-head { r: 7; }
#cursor.strike #cur-ember { opacity: 1; animation: ember 520ms ease-out; }
@keyframes ember {
  0% { opacity: 1; r: 1; }
  40% { r: 9; }
  100% { opacity: 0; r: 18; }
}

@media (hover: none) { #cursor { display: none; } }

/* ─── Bottom HUD ──────────────────────────────────────────────────────── */
#hud-bottom {
  position: fixed; bottom: 1.6rem; left: 1.8rem; right: 1.8rem;
  z-index: 20;
  display: flex; justify-content: space-between; align-items: flex-end;
  pointer-events: none;
}
#hint {
  font-family: var(--mono); font-size: 0.58rem; letter-spacing: 0.32em;
  color: var(--whisper); text-transform: uppercase;
  opacity: 0;
  transition: opacity 1.6s var(--ease-slow) 1.2s;
}
#hint.visible { opacity: 0.75; }
#hint em { font-style: italic; color: var(--linen); font-family: var(--serif); text-transform: lowercase; letter-spacing: 0.04em; }

#colophon {
  pointer-events: auto;
  display: flex; align-items: baseline; gap: 0.5rem;
  font-family: var(--serif); font-style: italic; font-weight: 300;
  font-size: 0.66rem; letter-spacing: 0.22em;
  color: var(--whisper); text-decoration: none;
  cursor: none;
  opacity: 0;
  transition: opacity 1.6s var(--ease-slow) 1.4s, color 0.4s ease;
}
#colophon.visible { opacity: 0.65; }
#colophon:hover { color: var(--ember); opacity: 1; }
#colophon em { font-style: italic; color: var(--linen); font-size: 0.72rem; letter-spacing: 0.14em; }
#colophon .colo-mark { font-style: normal; font-size: 0.56rem; opacity: 0.7; }
#colophon .colo-sep { color: var(--ember); font-style: normal; }
#colophon .colo-year { font-feature-settings: 'lnum' 1; letter-spacing: 0.32em; font-size: 0.56rem; }

/* ─── Mobile perfection ───────────────────────────────────────────────── */
@media (max-width: 820px) {
  :root {
    --hammer-w: 78vw;
    --hammer-h: 72px;
    --column-radius: 44vh;
  }
  #hud-top { top: 1rem; left: 1rem; right: 1rem; }
  #hud-bottom { bottom: 1rem; left: 1rem; right: 1rem; flex-direction: column; align-items: flex-start; gap: 0.8rem; }
  .hud-coord { align-items: flex-start; }
  #rail { right: 0.8rem; gap: 0.6rem; }
  .rail-item .rail-tick { width: 10px; }
  .rail-item.active .rail-tick { width: 22px; }
  .loader-word { font-size: clamp(2.5rem, 14vw, 5rem); letter-spacing: 0.18em; }
  .loader-meta { gap: 1.2rem; font-size: 0.52rem; bottom: 1.6rem; }
  .hammer-title { font-size: 1.1rem; }
  .hammer-head { width: 56px; height: 56px; }
  .detail-body { grid-template-columns: 1fr; gap: 1.4rem; }
  #detail { padding: 1.6rem; }
  #colophon { font-size: 0.52rem; letter-spacing: 0.14em; }
  #colophon em { font-size: 0.58rem; }
}

/* reduced motion respect */
@media (prefers-reduced-motion: reduce) {
  #column { transition: none; }
  .hammer.striking .hammer-head { animation-duration: 100ms; }
  #grain { animation: none; }
}

/* A Velocity atelier work — © MMXXVI */