/* ═══════════════════════════════════════════
   SH2 THEME — strict white/dark section polarity,
   richer backgrounds (grid / dots / beam), parallax
   hairlines, mobile colour-HUD strip, theme-strip.
   Additive layer: loads AFTER tokens.css +
   south-hustles.css and only introduces new classes
   (plus a dark-mode flip for .section--gradient-bn
   and the <900px .color-hud reposition).
   Token-driven: raw hex appears only where tokens.css
   itself inlines the same scale values (.section--inverted
   precedent) — locally re-declared pole scales.
   ═══════════════════════════════════════════ */

/* ── 1a. STRICT POLARITY SKINS ─────────────────
   .sec-light / .sec-dark override the soft grey
   gradient weave with a hard light or hard dark
   panel. In html[data-theme='dark'] the two INVERT
   so the page keeps alternating polarity.
   Do not combine with .section--inverted /
   .section--gradient-bn on the same element. */

/* light panel — flat, faintly gradient, dark ink.
   Uses the theme scales, so in dark mode it
   automatically becomes the DARK pole (inversion
   for free). */
.section.sec-light,
.sec-light {
  color: var(--ink-0);
  background: linear-gradient(
    180deg,
    var(--bg-1) 0%,
    var(--bg-0) 46%,
    var(--bg-2) 100%
  );
}

/* dark panel — near-black chapter, light ink,
   full local re-declaration so every child
   restyles itself (same technique as
   .section--inverted in tokens.css). */
.section.sec-dark,
.sec-dark {
  /* Neutral grayscale — no blue/cyan channel bias (Franco: "sin cyan en
     la version darkmode"). Drives #magnetic/#gravity/#canopy. */
  --bg-0: #0c0c0c;
  --bg-1: #131313;
  --bg-2: #1c1c1c;
  --bg-glass: rgba(18, 18, 18, 0.72);
  --ink-0: #f4f4f5;
  --ink-1: #b9b9c1;
  --ink-2: #84848e;
  --ink-3: #4c4c55;
  --line: #282828;
  --line-soft: #202020;
  --pole-hi: #181818;
  --pole-lo: #060606;
  --surface: #181818;
  --surface-ink: #1e1e1e;
  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.5), 0 16px 40px -24px rgba(0, 0, 0, 0.7);
  --shadow-lift: 0 2px 6px rgba(0, 0, 0, 0.55), 0 24px 60px -28px rgba(0, 0, 0, 0.85);
  color-scheme: dark;
  color: var(--ink-0);
  background: linear-gradient(180deg, #101010 0%, #060606 55%, #111111 100%);
}

/* INVERSION — in dark theme .sec-dark flips to the
   LIGHT pole (mirrors the light-theme token scale),
   so alternation survives the theme toggle. */
html[data-theme='dark'] .section.sec-dark,
html[data-theme='dark'] .sec-dark {
  --bg-0: #e6e6e6;
  --bg-1: #ededed;
  --bg-2: #dcdcdc;
  --bg-glass: rgba(230, 230, 230, 0.72);
  --ink-0: #0d0d0f;
  --ink-1: #46464b;
  --ink-2: #77777d;
  --ink-3: #a9a9ad;
  --line: #cfcfcf;
  --line-soft: #dcdcdc;
  --pole-hi: #ececec;
  --pole-lo: #d8d8d8;
  --surface: #f4f4f4;
  --surface-ink: #ffffff;
  --shadow-card: 0 1px 2px rgba(13, 13, 15, 0.04), 0 16px 40px -24px rgba(13, 13, 15, 0.16);
  --shadow-lift: 0 2px 6px rgba(13, 13, 15, 0.08), 0 24px 60px -28px rgba(13, 13, 15, 0.24);
  color-scheme: light;
  color: var(--ink-0);
  background: linear-gradient(180deg, #f0f0f0 0%, #e2e2e2 55%, #ececec 100%);
}

/* ── 1a-bis. gradient-bn direction flip in dark mode ──
   Light theme: white→black going down (as shipped).
   Dark theme: black→grey going DOWN, so the weave
   direction flips with the polarity. Greys stay dark
   enough that the forced light text in tokens.css
   keeps contrast. Overrides the equal-specificity
   rule in tokens.css by cascade order. */
html[data-theme='dark'] .section--gradient-bn {
  background: linear-gradient(
    180deg,
    #000000 0%,
    var(--pole-lo) 38%,
    var(--pole-hi) 82%,
    var(--bg-2) 100%
  );
}

/* ── 1b/1c. RICHER BACKGROUNDS ─────────────────
   Additive classes any section can carry (one per
   section — they share the ::before slot). They
   never replace the section background: the layer
   is painted by an inset pseudo sandwiched between
   the section background and its content
   (isolation + z-index:-1). Ink-driven, so both
   themes and both polarity skins work untouched. */
.bg-grid,
.bg-dots,
.bg-beam {
  position: relative;
  isolation: isolate;
}
.bg-grid::before,
.bg-dots::before,
.bg-beam::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

/* a) faint blueprint grid */
.bg-grid::before {
  background-image:
    repeating-linear-gradient(
      0deg,
      color-mix(in srgb, var(--ink-0) 7%, transparent) 0 1px,
      transparent 1px 56px
    ),
    repeating-linear-gradient(
      90deg,
      color-mix(in srgb, var(--ink-0) 7%, transparent) 0 1px,
      transparent 1px 56px
    );
  -webkit-mask-image: radial-gradient(120% 90% at 50% 40%, #000 55%, transparent 100%);
  mask-image: radial-gradient(120% 90% at 50% 40%, #000 55%, transparent 100%);
}

/* b) dot matrix */
.bg-dots::before {
  background-image: radial-gradient(
    color-mix(in srgb, var(--ink-0) 16%, transparent) 1px,
    transparent 1.6px
  );
  background-size: 24px 24px;
  -webkit-mask-image: radial-gradient(110% 90% at 50% 50%, #000 45%, transparent 100%);
  mask-image: radial-gradient(110% 90% at 50% 50%, #000 45%, transparent 100%);
}

/* c) soft diagonal accent beam */
.bg-beam::before {
  background:
    linear-gradient(
      112deg,
      transparent 26%,
      color-mix(in srgb, var(--accent) 13%, transparent) 46%,
      color-mix(in srgb, var(--accent-2) 9%, transparent) 60%,
      transparent 80%
    );
  filter: blur(0.5px);
}

/* ── 2. PARALLAX HAIRLINES (styled here, injected
   by js/sh2-lines.js into [data-lines] sections) ── */
.sh2-lines {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}
.sh2-line {
  position: absolute;
  left: -6%;
  width: 112%;
  height: 1px;
  transform: rotate(var(--sh2-rot, 0deg));
  will-change: transform;
  background: linear-gradient(
    90deg,
    transparent,
    color-mix(in srgb, var(--accent) 55%, transparent) 32%,
    color-mix(in srgb, var(--accent) 30%, transparent) 58%,
    transparent
  );
}
.sh2-line--warm {
  background: linear-gradient(
    90deg,
    transparent,
    color-mix(in srgb, var(--accent-2) 50%, transparent) 38%,
    color-mix(in srgb, var(--accent-soft) 40%, transparent) 66%,
    transparent
  );
}

/* ── 3a. HUD DOT TOOLTIPS — mono labels, both
   breakpoints. data-label is set by sh2-lines.js
   (initHudMobile) from the dot's aria-label. */
.color-hud__dot[data-label]::after {
  content: attr(data-label);
  position: absolute;
  left: calc(100% + 12px);
  top: 50%;
  translate: 0 -50%;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.08em;
  text-transform: lowercase;
  white-space: nowrap;
  color: var(--ink-0);
  background: color-mix(in srgb, var(--bg-0) 88%, transparent);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 5px 8px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s var(--ease-out);
}
.color-hud__dot:hover::after,
.color-hud__dot:focus-visible::after {
  opacity: 1;
}

/* ── 3b. MOBILE HUD — stays VISIBLE under 900px:
   compact horizontal strip pinned bottom-left,
   dots become a row along a horizontal track.
   (Overrides the display:none at 720px in
   south-hustles.css by cascade order.)
   Horizontal dragging is handled by initHudMobile
   in js/sh2-lines.js; the !important top pin keeps
   the desktop JS's inline vertical `top` from
   breaking the row. */
@media (max-width: 900px) {
  .color-hud {
    display: flex;
    flex-direction: row;
    align-items: center;
    top: auto;
    bottom: calc(14px + env(safe-area-inset-bottom, 0px));
    left: 12px;
    transform: none;
    gap: 12px;
    padding: 9px 14px;
    border-radius: 999px;
  }
  .color-hud__track {
    width: min(150px, 38vw);
    height: 10px;
    /* same holo ramp as the desktop track, rotated */
    background: linear-gradient(90deg, #ff5a7a, #6d5efc 50%, #57e6ff);
  }
  .color-hud__dot {
    top: 50% !important; /* beat the desktop JS inline top */
    width: 18px;
    height: 18px;
  }
  .color-hud__dot[data-dot='0'] { left: 20%; }
  .color-hud__dot[data-dot='1'] { left: 50%; }
  .color-hud__dot[data-dot='2'] { left: 80%; }
  .color-hud__reset {
    writing-mode: horizontal-tb;
    transform: none;
  }
  /* tooltip flips above the dot on the bottom strip */
  .color-hud__dot[data-label]::after {
    left: 50%;
    top: auto;
    bottom: calc(100% + 12px);
    translate: -50% 0;
  }
}

/* ── 4. THEME STRIP — slim fixed polarity-rhythm
   indicator on the right edge. Built + updated by
   initThemeStrip (js/sh2-lines.js): one segment per
   chapter; filled = dark panel, hollow = light
   panel, accent = chapter in view. Decorative. */
.theme-strip {
  position: fixed;
  right: 9px;
  top: 50%;
  translate: 0 -50%;
  z-index: 40;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  pointer-events: none;
}
.theme-strip__seg {
  width: 3px;
  height: 13px;
  border-radius: 2px;
  background: transparent;
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--ink-0) 34%, transparent);
  transition:
    background 0.3s var(--ease-out),
    height 0.3s var(--ease-out),
    box-shadow 0.3s var(--ease-out);
}
.theme-strip__seg--dark {
  background: color-mix(in srgb, var(--ink-0) 78%, transparent);
  box-shadow: none;
}
.theme-strip__seg--active {
  height: 24px;
  background: var(--accent);
  box-shadow: none;
}
@media (max-width: 900px) {
  .theme-strip { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .theme-strip__seg { transition: none; }
}