:root {
  /* Desktop Mat & Backdrop */
  --mat-bg-color: #171311;
  --mat-gradient: radial-gradient(circle at 50% 30%, #2b231d 0%, #171311 80%, #0d0a09 100%);
  --mat-shadow: 0 35px 70px -15px rgba(0, 0, 0, 0.7), 0 0 0 1px rgba(0, 0, 0, 0.5);

  /* Saddle-Tan Leather Binder Header */
  --leather-top: #a75e2b;
  --leather-mid: #824219;
  --leather-deep: #612c0c;
  --leather-bottom: #4a1f07;
  --leather-border: #351403;
  --leather-gradient: linear-gradient(180deg, var(--leather-top) 0%, var(--leather-mid) 38%, var(--leather-deep) 78%, var(--leather-bottom) 100%);
  --leather-inner-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.25), inset 0 -2px 6px rgba(0, 0, 0, 0.7);

  /* Recessed Stitching */
  --stitch-thread: #f5dfba;
  --stitch-highlight: rgba(255, 255, 255, 0.35);
  --stitch-shadow: rgba(0, 0, 0, 0.65);

  /* Brass Grommets & Rivets */
  --brass-highlight: #fffae0;
  --brass-rim: #e6b149;
  --brass-core: #b27a1e;
  --brass-dark: #633f08;
  --brass-bevel: inset 0 1px 1px rgba(255, 255, 255, 0.8), 0 2px 4px rgba(0, 0, 0, 0.45);

  /* Torn Paper & Shredded Remnants */
  --paper-rip-color: #f7f3e8;
  --paper-remnant-top: #e6dfce;
  --paper-remnant-mid: #efe9db;
  --paper-rip-shadow: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.18));

  /* Parchment Calendar Sheets */
  --parchment-sheet: #fbf8f0;
  --parchment-sheet-alt: #f3ede0;
  --parchment-border: rgba(90, 68, 45, 0.14);
  --parchment-weekend: rgba(140, 110, 80, 0.035);
  --parchment-other-month: #e8e2d4;
  --ink-primary: #2d261e;
  --ink-secondary: #6e6150;
  --ink-muted: #9c8e7c;
  --ink-today-highlight: #b83324;

  /* Classic Typography Stack */
  --font-serif: -apple-system, "Lucida Grande", "Hoefler Text", "Baskerville", Georgia, serif;
  --font-sans: -apple-system, "Lucida Grande", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "Courier New", Courier, monospace;

  /* Deboss and Letterpress Effects */
  --letterpress-light: 0 1px 0 rgba(255, 255, 255, 0.85);
  --letterpress-leather: 0 1px 1px rgba(0, 0, 0, 0.7), 0 -1px 0 rgba(255, 255, 255, 0.22);
  --letterpress-inset: inset 0 1px 2px rgba(0, 0, 0, 0.4), 0 1px 0 rgba(255, 255, 255, 0.4);

  /* Crimson Silk Ribbon Bookmark */
  --ribbon-red: #c92828;
  --ribbon-red-dark: #961919;
  --ribbon-shadow: 0 4px 10px rgba(0, 0, 0, 0.35);

  /* Colored Paper Event Chips */
  --chip-blue-bg: #e5effd;
  --chip-blue-border: #9ec0f7;
  --chip-blue-text: #1a427a;
  --chip-blue-stripe: #3b82f6;

  --chip-green-bg: #eaf6ed;
  --chip-green-border: #a4ddb6;
  --chip-green-text: #164e29;
  --chip-green-stripe: #22c55e;

  --chip-amber-bg: #fdf3e5;
  --chip-amber-border: #f8cf9b;
  --chip-amber-text: #733a0b;
  --chip-amber-stripe: #f59e0b;

  --chip-purple-bg: #f3ecfb;
  --chip-purple-border: #cfb9f5;
  --chip-purple-text: #442475;
  --chip-purple-stripe: #8b5cf6;

  --chip-rose-bg: #fae9e9;
  --chip-rose-border: #f4b2b2;
  --chip-rose-text: #791c1c;
  --chip-rose-stripe: #ef4444;

  /* Grid Metrics */
  --cell-min-height: 104px;
  --time-row-height: 48px;
}