/*
  render-the-arena-modern.css — "The Arena Modern" (SKIN-G06) Render layer
  token map aligned to BU-CORE-UIUX-001 §4.1, 2026-07-03
  ===========================================================================
  Fires when data-theme="the-arena-modern". ARENA/GAMIFIED category
  (student-facing only per BUP-UI-THEME-001 Rule 2). Phase 2 target.

  SOURCING CLASS: [AUTHORED PROPOSAL -- pending owner approval; no source
  values existed]. BUP-UI-SKIN-002 SKIN-G06 (lines 80-84) describes this
  skin only in prose: "Full cinematic treatment. Dark, dramatic lighting...
  dark, dramatic, cinematic, premium." No hex values exist. This file
  authors a deep-crimson-on-near-black accent distinct from both The Dojo
  (brush-stroke red) and Fight Night (cobalt), aiming for the "premium
  cinematic" register the catalog names via a desaturated, cooler red.

  Contrast check (WCAG AA, BUP-UI-SKIN-001 L-9): text-primary #f5f2f0 on
  canvas #08070a = ~18.3:1. text-secondary #b9a8a8 on canvas = ~9.0:1 --
  passes 4.5:1 minimum.
  ===========================================================================
*/

:root[data-theme="the-arena-modern"] {
  --theme-bg-canvas: #08070a;
  --theme-bg-surface: rgba(255, 245, 245, 0.04);
  --theme-bg-frosted: var(--theme-bg-surface); /* alias — dialect has no distinct frosted-fill token; §4.1 requires this name, value derived from bg-surface */
  --theme-bg-card: rgba(255, 245, 245, 0.07);
  --theme-x-bg-sunken: #08070a;
  --theme-border-inactive: rgba(255, 245, 245, 0.1);
  --theme-border-active: #7a2f3d;

  --theme-text-main: #f5f2f0;
  --theme-x-text-secondary: #b9a8a8;
  --theme-text-muted: #8a7a7a;
  --theme-x-text-inverse: #08070a;
  --theme-x-text-disabled: #4d4547;

  --theme-accent-primary: #7a2f3d;
  --theme-accent-secondary: var(--theme-accent-primary); /* alias — no distinct secondary accent hue exists in sources; §4.1 requires this name */
  --theme-x-accent-hover: #a8425570;
  --theme-x-accent-active: #5c2430;
  --theme-x-accent-disabled: rgba(122, 47, 61, 0.4);
  --theme-x-accent-text: #f5f2f0;
  --theme-x-focus-ring: #a84255;

  --theme-state-healthy: #3f7a5c;
  --theme-state-warning: #b98a4a;
  --theme-state-error: #d1495a;
  --theme-x-state-info: #7a2f3d;

  --theme-x-elevation-1: 0 1px 2px rgba(0, 0, 0, 0.5);
  --theme-x-elevation-2: 0 18px 40px rgba(0, 0, 0, 0.45);
  --theme-x-elevation-3: 0 0 24px rgba(122, 47, 61, 0.5);
  --theme-accent-glow: 0 0 24px rgba(122, 47, 61, 0.5); /* derived — same glow value as --theme-x-elevation-3 (measured/authored glow shadow); §4.1 requires this name */
  --theme-accent-glow-secondary: 0 0 24px rgba(122, 47, 61, 0.5); /* derived — no distinct secondary glow exists in sources; aliased to primary glow value */
  --theme-x-glass-tint: rgba(255, 245, 245, 0.04);
  --theme-backdrop-blur: 28px;

  --theme-x-font-family-base: var(--structure-font-family);
  --theme-x-font-size-sm: 0.875rem;
  --theme-x-font-size-base: 1rem;
  --theme-x-font-size-lg: 1.25rem;
  --theme-x-font-size-xl: 1.75rem;
  --theme-x-line-height-base: 1.5;
  --theme-x-space-unit: 0.5rem;
}

/* Structural selector list mirrors render-greyscale-skeleton.css / render-fight-night.css
   1:1 (R-S7-10 / D-S07-FW-01: structure never forks per skin — value-only skin). */
:root[data-theme="the-arena-modern"] body {
  background-color: var(--theme-bg-canvas);
  color: var(--theme-text-main);
}

:root[data-theme="the-arena-modern"] a {
  color: var(--theme-text-main);
}

:root[data-theme="the-arena-modern"] h1,
:root[data-theme="the-arena-modern"] h2,
:root[data-theme="the-arena-modern"] h3,
:root[data-theme="the-arena-modern"] h4,
:root[data-theme="the-arena-modern"] h5,
:root[data-theme="the-arena-modern"] h6 {
  color: var(--theme-text-main);
}

:root[data-theme="the-arena-modern"] p,
:root[data-theme="the-arena-modern"] li {
  color: var(--theme-x-text-secondary);
}

:root[data-theme="the-arena-modern"] .bu-panel {
  background-color: var(--theme-bg-surface);
  border: 1px solid var(--theme-border-inactive);
  border-top: 2px solid var(--theme-border-active);
  border-bottom: 2px solid var(--theme-border-active);
  box-shadow: var(--theme-x-elevation-2);
  backdrop-filter: blur(var(--theme-backdrop-blur));
  -webkit-backdrop-filter: blur(var(--theme-backdrop-blur));
  color: var(--theme-text-main);
}

:root[data-theme="the-arena-modern"] .bu-rail {
  background-color: rgba(8, 7, 10, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--theme-border-inactive);
  color: var(--theme-text-main);
}

:root[data-theme="the-arena-modern"] .bu-soffit {
  border-top: 1px solid var(--theme-border-inactive);
  color: var(--theme-text-muted);
  font-size: var(--structure-text-sm, 0.875rem);
}

:root[data-theme="the-arena-modern"] .bu-soffit a {
  color: var(--theme-text-muted);
}

:root[data-theme="the-arena-modern"] .bu-soffit a:hover {
  color: var(--theme-text-main);
}

:root[data-theme="the-arena-modern"] .bu-brick {
  color: var(--theme-x-text-secondary);
}

:root[data-theme="the-arena-modern"] .bu-badge-tag {
  background-color: var(--theme-bg-card);
  border: 1px solid var(--theme-border-active);
  color: var(--theme-text-main);
}

:root[data-theme="the-arena-modern"] .bu-control {
  background-color: var(--theme-bg-surface);
  border-color: var(--theme-border-active);
  color: var(--theme-text-main);
}

:root[data-theme="the-arena-modern"] .bu-control:hover {
  background-color: var(--theme-x-accent-hover);
  color: var(--theme-x-text-inverse);
}

:root[data-theme="the-arena-modern"] .bu-control:focus-visible {
  outline: 2px solid var(--theme-x-focus-ring);
  outline-offset: 2px;
}

:root[data-theme="the-arena-modern"] .bu-btn {
  background-color: rgba(255, 245, 245, 0.09);
  border-top: 2px solid var(--theme-border-active);
  border-bottom: 2px solid var(--theme-border-active);
  border-left-color: transparent;
  border-right-color: transparent;
  color: var(--theme-x-accent-text);
}

:root[data-theme="the-arena-modern"] .bu-btn:hover {
  background-color: rgba(255, 245, 245, 0.15);
  border-top-color: var(--theme-x-accent-hover);
  border-bottom-color: var(--theme-x-accent-hover);
}

:root[data-theme="the-arena-modern"] .bu-btn:disabled {
  background-color: rgba(255, 245, 245, 0.03);
  border-top-color: var(--theme-x-accent-disabled);
  border-bottom-color: var(--theme-x-accent-disabled);
  color: var(--theme-x-text-disabled);
}

:root[data-theme="the-arena-modern"] .bu-btn-secondary {
  background-color: transparent;
  border-color: var(--theme-border-active);
  color: var(--theme-text-main);
}

:root[data-theme="the-arena-modern"] .bu-btn-secondary:hover {
  border-color: var(--theme-x-accent-hover);
  color: var(--theme-x-accent-hover);
}

/* PG-035 demo skin switcher active-selection state (D-S07-SKIN-02 switcher UI). */
:root[data-theme="the-arena-modern"] .bu-btn-secondary.is-active {
  background-color: var(--theme-accent-primary);
  border-color: var(--theme-accent-primary);
  color: var(--theme-x-accent-text);
}

:root[data-theme="the-arena-modern"] .bu-btn:focus-visible,
:root[data-theme="the-arena-modern"] .bu-btn-secondary:focus-visible {
  outline: 2px solid var(--theme-x-focus-ring);
  outline-offset: 2px;
}

:root[data-theme="the-arena-modern"] .bu-gate {
  background-color: var(--theme-x-glass-tint);
  backdrop-filter: blur(var(--theme-backdrop-blur));
}

/* Brand lockup accent: the "UP" half of BELT|UP carries the accent hue, the
   rest inherits .bu-nav-brand's text colour. Uniform across every skin per
   D-S07-SKIN-02 (no partial-skin fallthrough) — added 2026-08-21 when an audit
   found this styled in only 2 of 20 skins. Uses the standard accent token, NOT
   the lighter hover tone. */
:root[data-theme="the-arena-modern"] .bu-nav-brand span {
  color: var(--theme-accent-primary);
}

/* --- Footer band -----------------------------------------------------------
   Ported 2026-08-21 to close a partial-skin fallthrough: this family was
   coloured in only 1 of 20 Public skins, so the footer rendered untinted and
   dividerless in every other skin (D-S07-SKIN-02). Token-for-token identical to
   render-greyscale-skeleton.css — no new values invented; each token resolves
   to this skin's own palette. */
:root[data-theme="the-arena-modern"] .bu-footer {
  border-top: 2px solid var(--theme-border-inactive);
  background-color: var(--theme-bg-surface);
}

:root[data-theme="the-arena-modern"] .bu-footer-heading {
  color: var(--theme-text-main);
}

:root[data-theme="the-arena-modern"] .bu-footer-copyright {
  border-top: 1px solid var(--theme-border-inactive);
  color: var(--theme-text-muted);
}

:root[data-theme="the-arena-modern"] .bu-footer-lab-link {
  color: var(--theme-text-muted);
}

:root[data-theme="the-arena-modern"] .bu-link-stealth {
  color: var(--theme-text-muted);
}

:root[data-theme="the-arena-modern"] .bu-link-stealth:hover {
  color: var(--theme-text-main);
}

/* ==== #234 CONSTRUCTION FAMILY BEGIN ==== (ENCLOSURE, family 3 of 8) ====
   Skin "the-arena-modern" belongs to the ENCLOSURE construction family. Colour variants of one
   family share this construction and differ only in the variables above. */
/* family variables: derived from this skin's own palette; contrast pairs verified >= 4.5:1 (fill/ink), >= 3:1 (edge, focus) against the canvas */
:root[data-theme="the-arena-modern"] {
  --fam-edge: #d1495a;
  --fam-hi: #f0a3ad;
  --fam-hov: #8f3a4b;
  --fam-fill: #7a2f3d;
  --fam-ink: #f5f2f0;
  --fam-deep: #3a1219;
  --fam-focus: #f0a3ad;
  --fam-glow: color-mix(in srgb, #d1495a 55%, transparent);
  --theme-text-muted: #978989; /* AA repair (>= 4.7:1 on canvas, surface and card), hue kept semantic */
  --theme-state-healthy: #67967e; /* AA repair (>= 4.7:1 on canvas, surface and card), hue kept semantic */
  --theme-state-error: #d96876; /* AA repair (>= 4.7:1 on canvas, surface and card), hue kept semantic */
}

/* ===========================================================================
   CONSTRUCTION FAMILY 3 of 8 — ENCLOSURE  [#234 / R-0823-01 / R-0823-02]
   Reference: enclosure.html ("four-sided enclosure, skewed plate").
   Frame strategy: FOUR separate light bars (top, bottom, left, right) that
   stand off the plate and stop short of the corners, each with a bright inner
   core; the plate behind the text is SKEWED a few degrees, so the frame and
   the plate disagree on purpose.
   Light source: the bars (core + bloom). Palette: dark, one hue.
   Type: ultra-light display weight, labels in boxed, very wide-tracked tabs.
   [PILLAR-1: Fogg prompt/ability -- the plate is the only filled shape, so the
   eye lands on the content; the bars only signal "this is one object".]
   =========================================================================== */
:root[data-theme="the-arena-modern"] body {
  overflow-x: clip;
  background-image: radial-gradient(90% 55% at 50% -5%, color-mix(in srgb, var(--fam-deep) 60%, transparent), transparent 62%);
  background-repeat: no-repeat;
}
:root[data-theme="the-arena-modern"] .bu-panel {
  border: 0;
  border-radius: 0;
  isolation: isolate;
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}
:root[data-theme="the-arena-modern"] .bu-panel:not(.bu-drawer):not(.bu-slideout-content):not(.bu-report-widget-panel) { margin: 8px; }
/* the skewed plate (behind content, inside the panel's stacking context) */
:root[data-theme="the-arena-modern"] .bu-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  transform: skewX(-3deg);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0) 55%),
    linear-gradient(var(--theme-bg-surface), var(--theme-bg-surface)),
    var(--theme-bg-canvas);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--fam-edge) 24%, transparent), inset 0 0 50px -24px var(--fam-edge);
}
/* the four bars: gaps at every corner, a 1px bright core inside the long sides */
:root[data-theme="the-arena-modern"] .bu-panel::after {
  content: "";
  position: absolute;
  inset: -8px;
  pointer-events: none;
  background-image:
    linear-gradient(90deg, transparent 0 9%, var(--fam-edge) 9% 91%, transparent 91%),
    linear-gradient(90deg, transparent 0 9%, var(--fam-edge) 9% 91%, transparent 91%),
    linear-gradient(180deg, transparent 0 13%, var(--fam-edge) 13% 87%, transparent 87%),
    linear-gradient(180deg, transparent 0 13%, var(--fam-edge) 13% 87%, transparent 87%),
    linear-gradient(90deg, transparent 0 22%, var(--fam-hi) 22% 78%, transparent 78%),
    linear-gradient(90deg, transparent 0 22%, var(--fam-hi) 22% 78%, transparent 78%);
  background-repeat: no-repeat;
  background-size: 100% 3px, 100% 3px, 3px 100%, 3px 100%, 100% 1px, 100% 1px;
  background-position: 0 0, 0 100%, 0 0, 100% 0, 0 1px, 0 calc(100% - 1px);
  filter: drop-shadow(0 0 7px var(--fam-glow));
}
:root[data-theme="the-arena-modern"] h1, :root[data-theme="the-arena-modern"] h2, :root[data-theme="the-arena-modern"] h3 { font-weight: 200; letter-spacing: 0.03em; overflow-wrap: break-word; }
:root[data-theme="the-arena-modern"] .bu-panel h2, :root[data-theme="the-arena-modern"] .bu-panel h3, :root[data-theme="the-arena-modern"] .bu-panel-title, :root[data-theme="the-arena-modern"] .bu-panel-headline,
:root[data-theme="the-arena-modern"] .bu-metric-value, :root[data-theme="the-arena-modern"] .bu-gauge-value { text-shadow: 0 0 22px color-mix(in srgb, var(--fam-edge) 70%, transparent); }
/* label box: boxed, very wide tracking */
:root[data-theme="the-arena-modern"] .bu-panel-sublabel, :root[data-theme="the-arena-modern"] .bu-badge-tag, :root[data-theme="the-arena-modern"] .bu-metric-label, :root[data-theme="the-arena-modern"] .bu-panel-footnote {
  text-transform: uppercase;
  letter-spacing: 0.3em;
  font-size: var(--structure-text-xs, 0.75rem);
  font-weight: 400;
}
:root[data-theme="the-arena-modern"] .bu-badge-tag, :root[data-theme="the-arena-modern"] .bu-panel-sublabel { background: transparent; border: 0; border-radius: 0; box-shadow: inset 0 0 0 1px var(--fam-edge); padding: 0.4rem 0.9rem; color: var(--fam-hi); }
:root[data-theme="the-arena-modern"] .bu-metric { border-bottom: 1px solid color-mix(in srgb, var(--fam-edge) 26%, transparent); }
:root[data-theme="the-arena-modern"] .bu-rail {
  border-bottom: 0;
  background-image: linear-gradient(90deg, transparent 0 6%, var(--fam-edge) 6% 94%, transparent 94%);
  background-size: 100% 2px;
  background-position: 0 100%;
  background-repeat: no-repeat;
}
:root[data-theme="the-arena-modern"] .bu-nav-links a:hover, :root[data-theme="the-arena-modern"] .bu-nav-links a.active { color: var(--fam-hi); text-shadow: 0 0 12px var(--fam-glow); }
/* controls carry the same side-bar motif at button scale */
:root[data-theme="the-arena-modern"] .bu-btn {
  background: var(--fam-fill);
  border: 1px solid var(--fam-fill);
  border-radius: 0;
  color: var(--fam-ink);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  box-shadow: inset 3px 0 0 var(--fam-hi), inset -3px 0 0 var(--fam-hi), 0 0 16px -4px var(--fam-glow);
}
:root[data-theme="the-arena-modern"] .bu-btn:hover { background: var(--fam-hov); border-color: var(--fam-hov); color: var(--fam-ink); box-shadow: inset 3px 0 0 #fff, inset -3px 0 0 #fff, 0 0 22px -2px var(--fam-glow); }
:root[data-theme="the-arena-modern"] .bu-btn-secondary {
  background: transparent;
  border: 1px solid var(--fam-edge);
  border-radius: 0;
  color: var(--fam-hi);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  box-shadow: inset 3px 0 0 var(--fam-edge), inset -3px 0 0 var(--fam-edge);
}
:root[data-theme="the-arena-modern"] .bu-btn-secondary:hover { background: color-mix(in srgb, var(--fam-edge) 16%, transparent); color: var(--fam-hi); border-color: var(--fam-hi); }
:root[data-theme="the-arena-modern"] .bu-btn-secondary.is-active { background: var(--fam-fill); border-color: var(--fam-fill); color: var(--fam-ink); }
:root[data-theme="the-arena-modern"] .bu-control, :root[data-theme="the-arena-modern"] .bu-field input[type="text"], :root[data-theme="the-arena-modern"] .bu-field input[type="email"], :root[data-theme="the-arena-modern"] .bu-field input[type="tel"],
:root[data-theme="the-arena-modern"] .bu-field input[type="password"], :root[data-theme="the-arena-modern"] .bu-field input[type="number"], :root[data-theme="the-arena-modern"] .bu-field select, :root[data-theme="the-arena-modern"] .bu-field textarea,
:root[data-theme="the-arena-modern"] input.bu-input, :root[data-theme="the-arena-modern"] select.bu-input, :root[data-theme="the-arena-modern"] textarea.bu-input {
  background: color-mix(in srgb, var(--theme-bg-canvas) 80%, var(--theme-bg-card));
  border: 1px solid var(--fam-edge);
  border-radius: 0;
  color: var(--theme-text-main);
  box-shadow: inset 3px 0 0 var(--fam-edge);
}
:root[data-theme="the-arena-modern"] .bu-control:hover, :root[data-theme="the-arena-modern"] .bu-field input:hover, :root[data-theme="the-arena-modern"] .bu-field select:hover, :root[data-theme="the-arena-modern"] .bu-field textarea:hover { border-color: var(--fam-hi); color: var(--theme-text-main); background: color-mix(in srgb, var(--theme-bg-canvas) 80%, var(--theme-bg-card)); }
:root[data-theme="the-arena-modern"] .bu-table th, :root[data-theme="the-arena-modern"] .bu-table td { border-bottom: 1px solid color-mix(in srgb, var(--fam-edge) 26%, transparent); }
:root[data-theme="the-arena-modern"] .bu-table th { text-transform: uppercase; letter-spacing: 0.16em; font-weight: 400; }

/* Narrow viewports (#234 D2): the skew and the -8px bars would poke past the page edge
   (measured +14px at 375). The slant is drawn as a clipped parallelogram INSIDE the panel
   box (no transform, so nothing can overflow) and the bars tuck in to 3px. */
@media (max-width: 640px) {
  :root[data-theme="the-arena-modern"] .bu-panel::before { transform: none; clip-path: polygon(2.5% 0, 100% 0, 97.5% 100%, 0 100%); }
  :root[data-theme="the-arena-modern"] .bu-panel::after { inset: -4px; }
}

/* --- shared floors every family honours (state tokens, focus, option list) --- */
:root[data-theme="the-arena-modern"] .bu-field select option,
:root[data-theme="the-arena-modern"] select.bu-input option {
  background-color: var(--theme-bg-canvas);
  color: var(--theme-text-main);
}
:root[data-theme="the-arena-modern"] .bu-btn:focus-visible,
:root[data-theme="the-arena-modern"] .bu-btn-secondary:focus-visible,
:root[data-theme="the-arena-modern"] .bu-control:focus-visible,
:root[data-theme="the-arena-modern"] .bu-field input:focus-visible,
:root[data-theme="the-arena-modern"] .bu-field select:focus-visible,
:root[data-theme="the-arena-modern"] .bu-field textarea:focus-visible,
:root[data-theme="the-arena-modern"] .bu-input:focus-visible,
:root[data-theme="the-arena-modern"] .bu-nav-links a:focus-visible,
:root[data-theme="the-arena-modern"] .bu-tab-btn:focus-visible {
  outline: 2px solid var(--fam-focus);
  outline-offset: 2px;
}
:root[data-theme="the-arena-modern"] .bu-btn:disabled,
:root[data-theme="the-arena-modern"] .bu-btn-secondary:disabled {
  background: transparent;
  border-color: var(--theme-x-accent-disabled);
  color: var(--theme-x-text-disabled);
  box-shadow: none;
  filter: none;
}
:root[data-theme="the-arena-modern"] .bu-status-dot.is-healthy { background: var(--theme-state-healthy); }
:root[data-theme="the-arena-modern"] .bu-status-dot.is-warning,
:root[data-theme="the-arena-modern"] .bu-status-dot.is-alert { background: var(--theme-state-warning); }
:root[data-theme="the-arena-modern"] .bu-status-dot.is-error { background: var(--theme-state-error); }
:root[data-theme="the-arena-modern"] .bu-field-error { color: var(--theme-state-error); }
/* --- overlay / scroll-container panels (Admin drawers, slide-outs, the report widget) ---
   A family frame is drawn on pseudo-elements and a plate that would scroll away with the
   content, and some panel margins would leave a closed drawer peeking in. Overlay panels
   therefore get a solid attached fill, one plain outline, no pseudo frame, no clip. */
:root[data-theme="the-arena-modern"] .bu-drawer, :root[data-theme="the-arena-modern"] .bu-slideout-content, :root[data-theme="the-arena-modern"] .bu-report-widget-panel {
  clip-path: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  background-color: var(--theme-bg-canvas);
  background-image: linear-gradient(var(--theme-bg-surface), var(--theme-bg-surface));
  background-repeat: no-repeat;
  background-size: 100% 100%;
  background-position: 0 0;
  border: 1px solid var(--fam-edge);
  box-shadow: none;
  isolation: auto;
}
:root[data-theme="the-arena-modern"] .bu-drawer::before, :root[data-theme="the-arena-modern"] .bu-drawer::after,
:root[data-theme="the-arena-modern"] .bu-slideout-content::before, :root[data-theme="the-arena-modern"] .bu-slideout-content::after,
:root[data-theme="the-arena-modern"] .bu-report-widget-panel::before, :root[data-theme="the-arena-modern"] .bu-report-widget-panel::after { content: none; }

@media (prefers-reduced-motion: reduce) {
  :root[data-theme="the-arena-modern"] .bu-btn, :root[data-theme="the-arena-modern"] .bu-btn-secondary { transition: none; transform: none; }
}
:root[data-reduced-motion="true"][data-theme="the-arena-modern"] .bu-btn,
:root[data-reduced-motion="true"][data-theme="the-arena-modern"] .bu-btn-secondary { transition: none; transform: none; }
/* ==== #234 CONSTRUCTION FAMILY END ==== */