/**
 * Marbl Design System v2.0.0
 * Clean token set built from BRAND.md (canonical source of truth).
 * For: component library, Marbl Codes rebuild, all new Marbl properties.
 * NOT for: legacy live pages (use marbl.css v1) or client sites (own CSS).
 *
 * Source: Marbl/design-system/BRAND.md
 * Created: 21 April 2026
 */

/* ==========================================================================
   Tokens
   ========================================================================== */

:root {
  /* ── Colours ── */
  --marbl-charcoal: #171415;
  --marbl-charcoal-deep: #0d0b0c;
  --marbl-charcoal-darkest: #131112;  /* Dark text on ember CTA — locked 30 Apr 2026 */
  --marbl-charcoal-light: #1d1a1b;
  --marbl-charcoal-lighter: #232021;
  --marbl-ember: #F35226;
  --marbl-ember-dark: #BB2F09;
  --marbl-crimson: #322A2A;
  --marbl-sandstone: #A69B98;
  --marbl-beige: #F3E2C8;
  --marbl-beige-dark: #DBCBA9;
  --marbl-black: #000000;
  --marbl-white: #FFFFFF;

  /* Text opacity scale (white on dark) */
  --marbl-white-90: rgba(255, 255, 255, 0.9);
  --marbl-white-85: rgba(255, 255, 255, 0.85);  /* Outline button text — locked 30 Apr 2026 */
  --marbl-white-70: rgba(255, 255, 255, 0.7);
  --marbl-white-65: rgba(255, 255, 255, 0.65);  /* Avatar initials fallback */
  --marbl-white-50: rgba(255, 255, 255, 0.5);
  --marbl-white-40: rgba(255, 255, 255, 0.4);
  --marbl-white-30: rgba(255, 255, 255, 0.3);
  --marbl-white-25: rgba(255, 255, 255, 0.25);
  --marbl-white-20: rgba(255, 255, 255, 0.2);
  --marbl-white-15: rgba(255, 255, 255, 0.15);
  --marbl-white-10: rgba(255, 255, 255, 0.1);
  --marbl-white-08: rgba(255, 255, 255, 0.08);
  --marbl-white-06: rgba(255, 255, 255, 0.06);
  --marbl-white-04: rgba(255, 255, 255, 0.04);

  /* Ember opacity scale (ember tinted overlays / hover backgrounds) */
  --marbl-ember-10: rgba(243, 82, 38, 0.1);

  /* Black opacity scale (dark overlays on light surfaces) */
  --marbl-black-15: rgba(0, 0, 0, 0.15);

  /* Status */
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;

  /* ── Typography ── */
  --font-heading: 'Urbanist', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-accent: 'Petrona', Georgia, serif;

  --font-light: 300;
  --font-regular: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;

  /* Type scale: fixed for small, fluid clamp() for large */
  --text-xs: 11px;
  --text-sm: 13px;
  --text-base: 15px;
  --text-lg: clamp(16px, 0.9rem + 0.3vw, 18px);
  --text-xl: clamp(19px, 1rem + 0.5vw, 22px);
  --text-2xl: clamp(24px, 1.2rem + 1vw, 32px);
  --text-3xl: clamp(36px, 1.5rem + 2.5vw, 56px);
  --text-4xl: clamp(48px, 2rem + 3.5vw, 80px);
  --text-5xl: clamp(56px, 2.5rem + 5vw, 112px);

  /* ── Spacing: one scale for everything ── */
  /* Gaps, margins, padding, all use this. Core: 10/20/40. */
  --gap-3xs: 4px;   /* Tightest hierarchical step — list/TOC item v-padding — locked 30 Apr 2026 */
  --gap-half: 5px;
  --gap-tight: 6px; /* Typographic micro-rhythm (list-item bottom, label rest) — locked 30 Apr 2026 */
  --gap-2xs: 8px;   /* Tight gap for compact controls (mini buttons) — locked 30 Apr 2026 */
  --gap-xs: 10px;
  --gap-sm: 20px;
  --gap-md: 40px;
  --gap-lg: 60px;
  --gap-xl: 80px;
  --gap-2xl: 100px;
  --gap-3xl: 120px;
  --gap-4xl: 140px;
  --gap-5xl: 160px;

  /* ── Border radius ── */
  --radius-2xs: 2px;       /* Tightest — small UI utility rails (slider tracks) */
  --radius-xs: 4px;        /* Small focus ring radius */
  --radius-sm: 8px;        /* Compact controls (mini buttons) */
  --radius: 10px;          /* Default */
  --radius-lg: 20px;
  --radius-circle: 50%;    /* Round shapes — locked 30 Apr 2026 */
  --radius-full: 9999px;

  /* ── Icon sizing ── */
  /* Glyph + container dimensions for icons (separate from gap/spacing).
     Locked 30 Apr 2026 to remove canonical literals. */
  --icon-xs: 11px;
  --icon-sm: 14px;
  --icon-md: 16px;
  --icon-lg: 20px;
  --icon-xl: 22px;
  --icon-2xl: 28px;
  --icon-3xl: 32px;
  --icon-4xl: 48px;

  /* ── Borders ── */
  --border-subtle: 1px solid rgba(255, 255, 255, 0.04);
  --border-standard: 1px solid rgba(255, 255, 255, 0.06);
  --border-visible: 1px solid rgba(255, 255, 255, 0.08);
  --border-interactive: 1px solid rgba(255, 255, 255, 0.15);
  --border-ember: 1px solid rgba(243, 82, 38, 0.15);

  /* ── Transitions ── */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;
  --ease-marbl: cubic-bezier(0.32, 0.72, 0, 1);
  --ease-fast: cubic-bezier(0.16, 1, 0.3, 1);

  /* ── Content widths (200px steps) ── */
  --width-sm: 600px;
  --width-md: 800px;
  --width-lg: 1000px;
  --width-xl: 1200px;
  --width-2xl: 1400px;
  --width-max: 1600px;
  --width-ultra: 1800px;

  /* ── Breakpoints (CSS custom properties can't be used in @media,
       but documented here as canonical reference) ── */
  /* --bp-mobile: 480px;   */
  /* --bp-tablet: 768px;   */
  /* --bp-desktop: 1024px; */
  /* --bp-wide: 1440px;    */
  /* --bp-ultra: 1800px;   */

  /* ── Layout ── */
  --section-pad-y: var(--gap-xl);
  --section-pad-x: var(--gap-md);

  /* ── Z-index ── */
  --z-base: 0;
  --z-above: 10;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal: 300;
  --z-toast: 400;
  --z-tooltip: 500;
}

/* ==========================================================================
   Reset
   ========================================================================== */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scrollbar-width: thin;
  scrollbar-color: var(--marbl-ember) var(--marbl-charcoal);
  /* Native smooth-scroll for in-page anchors. Reduced-motion override below
   * disables this for users who prefer no animation. Locked 30 Apr 2026. */
  scroll-behavior: smooth;
}

/* Desktop only — `scrollbar-gutter: stable` reserves horizontal space for a
 * vertical scrollbar even when one isn't visible, preventing layout shift on
 * long pages. On mobile (touch / pointer:coarse), scrollbars are overlay so
 * they don't take horizontal space — and reserving the gutter interacts badly
 * with mobile Chrome's address-bar-collapse-on-scroll, causing visible page
 * jumps. Scoped to pointer:fine (mouse/trackpad devices) to keep desktops
 * stable while leaving mobile alone. Locked 30 Apr 2026. */
@media (pointer: fine) {
  html { scrollbar-gutter: stable; }
}

/* Honour prefers-reduced-motion: disable native smooth-scroll for users with
 * the OS-level reduced-motion preference. Locked 30 Apr 2026. */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--font-regular);
  line-height: 1.6;
  color: var(--marbl-white);
  background-color: var(--marbl-charcoal);
}

/* ── Universal focus ring ── */
:focus-visible {
  outline: 2px solid var(--marbl-ember);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

/* ── Links ── */
a {
  color: var(--marbl-ember);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--marbl-white);
}

/* ── Images ── */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ── Scrollbar (desktop only) ── */
/* Track matches body charcoal (no visible track), solid ember thumb. Simple. */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--marbl-charcoal);
}

::-webkit-scrollbar-thumb {
  background: var(--marbl-ember);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--marbl-ember-dark);
}

/* Firefox scrollbar styling is declared in the primary html {} rule above (merged to avoid two separate html blocks) */

/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ── Screen reader only ── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ── Logo (canonical) ── */
/* Outer anchor for the animated logo. MarblLogo.init() in marbl-core-v2.js
   finds `[data-logo-animate]` elements and injects a `.marbl-logo-animated`
   wrapper inside. This class sets the anchor's display + colour baseline.
   Restored here 22 April 2026 after burger menu preview showed logo not
   rendering (v2 migration left these behind in marbl.css v1). */
.marbl-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--gap-xs, 10px);
  text-decoration: none;
  color: var(--marbl-white);
}

.marbl-logo:hover {
  color: var(--marbl-white);
}

/* Wrapper injected by marbl-core-v2.js MarblLogo.createLogo(). Inline styles
   set explicit width + height in JS; this class provides the display mode
   and positioning context as a fallback. */
.marbl-logo-animated {
  display: inline-flex;
  align-items: center;
  position: relative;
}

/* Larger header variant (used by some marketing pages). */
.marbl-logo-lg .marbl-logo-animated {
  transform: scale(1.2);
  transform-origin: left center;
}

/* ── Social icon button (canonical) ── */
/* Used by site-footer, burger menu, and anywhere a row of bare social icons
   appears. Bare SVG (no circle bg). White-50 at rest. Ember colour +
   translateY(-2px) lift on hover. Previously lived in marbl.css v1 only —
   restored here 22 April 2026 after footer regression (site-footer.css
   expects this class to exist in v2). */
.btn-icon-social {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: var(--marbl-white-50);
  background: transparent;
  text-decoration: none;
  transition: color 0.15s ease, transform 0.15s ease;
}

.btn-icon-social:hover {
  color: var(--marbl-ember);
  transform: translateY(-2px);
}

.btn-icon-social:focus-visible {
  outline: 2px solid var(--marbl-ember);
  outline-offset: 2px;
  border-radius: 4px;
}

.btn-icon-social svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}