/* ==========================================================================
   MERIDIAN — design system
   A VDFS Advisory publication. Single source of visual truth, consumed by the
   hub, the web newsletter, and the infographic renderer. Edit tokens here only.
   ========================================================================== */

:root {
  /* --- Light (default) palette --- */
  --paper:        #F4F1E8;
  --paper-panel:  #EBE6D8;
  --paper-sunk:   #E3DCC9;
  --ink:          #1A1713;
  --ink-soft:     #423B31;
  --muted:        #8C8472;
  --rule:         #D7CFBC;
  --accent:       #B23A2E;
  --accent-deep:  #7E271E;
  --gold:         #A8823C;

  /* --- Type --- */
  --font-display: "Fraunces", "Times New Roman", serif;
  --font-body:    "Newsreader", Georgia, serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, "SFMono-Regular", monospace;

  /* Fluid type scale (clamped) */
  --step--1: clamp(0.82rem, 0.78rem + 0.2vw, 0.92rem);
  --step-0:  clamp(1.06rem, 1rem + 0.3vw, 1.2rem);
  --step-1:  clamp(1.33rem, 1.2rem + 0.6vw, 1.6rem);
  --step-2:  clamp(1.7rem, 1.45rem + 1.1vw, 2.3rem);
  --step-3:  clamp(2.2rem, 1.7rem + 2.2vw, 3.4rem);
  --step-4:  clamp(2.9rem, 2rem + 4vw, 5.2rem);
  --step-5:  clamp(3.6rem, 2.2rem + 6.5vw, 7.5rem);

  /* Spacing & layout */
  --measure: 68ch;
  --gutter: clamp(1.25rem, 0.6rem + 3vw, 3rem);
  --maxw: 1200px;
  --radius: 2px;

  color-scheme: light;
}

[data-theme="dark"] {
  --paper:        #15120D;
  --paper-panel:  #1E1A13;
  --paper-sunk:   #241F16;
  --ink:          #F2ECDD;
  --ink-soft:     #C9C0AC;
  --muted:        #8E856F;
  --rule:         #332C20;
  --accent:       #D9694F;
  --accent-deep:  #E68A72;
  --gold:         #CBA45A;
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper:        #15120D;
    --paper-panel:  #1E1A13;
    --paper-sunk:   #241F16;
    --ink:          #F2ECDD;
    --ink-soft:     #C9C0AC;
    --muted:        #8E856F;
    --rule:         #332C20;
    --accent:       #D9694F;
    --accent-deep:  #E68A72;
    --gold:         #CBA45A;
    color-scheme: dark;
  }
}

/* --- Reset-ish --- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  font-optical-sizing: auto;
  line-height: 1.62;
  font-feature-settings: "liga" 1, "kern" 1, "onum" 1;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Paper grain — subtle warmth so backgrounds aren't dead-flat */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.035'/%3E%3C/svg%3E");
}
[data-theme="dark"] body::before { mix-blend-mode: screen; opacity: 0.6; }

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 460;
  line-height: 1.02;
  letter-spacing: -0.012em;
  margin: 0 0 0.4em;
  font-optical-sizing: auto;
}
h1 { font-size: var(--step-4); font-weight: 500; }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-2); }
p { margin: 0 0 1.1em; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent-deep); }

/* Editorial labels / kickers / meta */
.kicker, .meta, .label {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
.kicker { color: var(--accent); font-weight: 500; }

/* Hairline rule */
.rule { height: 1px; background: var(--rule); border: 0; margin: 0; }

/* Layout helpers */
.wrap { width: min(100% - 2 * var(--gutter), var(--maxw)); margin-inline: auto; position: relative; z-index: 1; }
.prose { max-width: var(--measure); }

/* Drop-cap for article openers */
.dropcap::first-letter {
  font-family: var(--font-display);
  font-weight: 600;
  float: left;
  font-size: 3.6em;
  line-height: 0.72;
  padding: 0.06em 0.1em 0 0;
  color: var(--accent);
}

/* Tag pill */
.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border: 1px solid var(--rule);
  border-radius: 100px;
  padding: 0.28em 0.7em;
  white-space: nowrap;
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 0.55em;
  font-family: var(--font-mono);
  font-size: 0.82rem; letter-spacing: 0.06em; text-transform: uppercase;
  padding: 0.85em 1.4em;
  background: var(--ink); color: var(--paper);
  border: 1px solid var(--ink); border-radius: var(--radius);
  text-decoration: none; cursor: pointer;
  transition: transform .25s cubic-bezier(.2,.8,.2,1), background .25s, color .25s;
}
.btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; transform: translateY(-2px); }
.btn--ghost { background: transparent; color: var(--ink); }
.btn--ghost:hover { background: var(--ink); color: var(--paper); }

/* Staggered load reveal */
@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(14px); animation: rise .9s cubic-bezier(.2,.8,.2,1) forwards; }
  @keyframes rise { to { opacity: 1; transform: none; } }
}

::selection { background: var(--accent); color: #fff; }