/* ==========================================================================
   Intraneurals studio tokens — shared visual identity
   Source: approved Tiruvallur studio system (not cream/serif edtech).
   Loaded AFTER site.css so it remaps the legacy variable surface.
   ========================================================================== */

:root {
  /* Core */
  --paper: #F7F7F5;
  --ink: #14181C;
  --ink-2: #4A535C;
  --ink-3: #7A828A;
  --blueprint: #1B4CD6;
  --kolam: #C9CFD6;
  --signal: #F2B705;
  --paper-2: #FFFFFF;
  --rule: color-mix(in srgb, var(--kolam) 72%, var(--ink) 28%);

  /* Type */
  --font-display: 'IBM Plex Sans Condensed', 'IBM Plex Sans', system-ui, sans-serif;
  --font-body: 'IBM Plex Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;
  --font-tamil: 'IBM Plex Sans Tamil', 'Noto Sans Tamil', sans-serif;
  --font-ui: var(--font-body);
  --font-serif: var(--font-body);

  /* Scale (8px grid) */
  --space: 8px;
  --step--1: 0.875rem;
  --step-0: 1rem;
  --step-1: 1.25rem;
  --step-2: 1.75rem;
  --step-3: 2.5rem;
  --step-4: 3.75rem;
  --step-5: 5.5rem;
  --max: 1120px;

  /* Map into site.css variable names used by existing components */
  --bg: var(--paper);
  --surface-1: var(--paper-2);
  --surface-2: color-mix(in srgb, var(--paper) 88%, var(--kolam) 12%);
  --surface-3: color-mix(in srgb, var(--paper) 70%, var(--kolam) 30%);

  --text-primary: var(--ink);
  --text-secondary: var(--ink-2);
  --text-tertiary: var(--ink-3);
  --text-muted: var(--ink-3);

  --accent: var(--blueprint);
  --accent-dim: color-mix(in srgb, var(--blueprint) 82%, #000 18%);
  --accent-glow: color-mix(in srgb, var(--blueprint) 12%, transparent);
  --bronze: var(--ink-3);
  --cta: var(--ink);
  --cta-hover: var(--blueprint);

  --ink-panel: var(--ink);
  --ink-panel-2: color-mix(in srgb, var(--ink) 92%, #000 8%);
  --pine-panel: var(--ink);
  --paper-on-ink: var(--paper);
  --paper-dim-on-ink: color-mix(in srgb, var(--paper) 72%, transparent);
  --border-on-ink: color-mix(in srgb, var(--paper) 16%, transparent);

  --border: color-mix(in srgb, var(--ink) 12%, transparent);
  --border-strong: color-mix(in srgb, var(--ink) 22%, transparent);
  --error: #B3362B;
  --build-bg: var(--ink);

  --text-xs: var(--step--1);
  --text-eyebrow: 0.75rem;
  --text-sm: 0.9375rem;
  --text-base: var(--step-0);
  --text-lg: var(--step-1);
  --text-xl: clamp(1.25rem, 1rem + 0.8vw, 1.5rem);
  --text-2xl: clamp(1.75rem, 1.2rem + 1.6vw, 2.25rem);
  --text-3xl: clamp(2.125rem, 1.4rem + 2.4vw, 3rem);
  --text-hero: clamp(2.5rem, 1.5rem + 4vw, 4.25rem);

  --space-1: var(--space);
  --space-2: calc(var(--space) * 1.5);
  --space-3: calc(var(--space) * 2);
  --space-4: calc(var(--space) * 3);
  --space-5: calc(var(--space) * 4);
  --space-6: calc(var(--space) * 6);
  --space-7: calc(var(--space) * 8);
  --space-8: calc(var(--space) * 12);
  --space-section: clamp(4rem, 2.5rem + 5vw, 7rem);

  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 6px;
  --radius-full: 999px;

  --max-width: var(--max);
  --page-padding: clamp(1.25rem, 4vw, 2rem);
  --nav-height: 64px;
  --session-bar-height: 0px;

  --shadow-raise: none;
  --shadow-modal: 0 20px 50px -24px color-mix(in srgb, var(--ink) 35%, transparent);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 180ms;

  --track-body: 0;
  --word-body: normal;
  --track-display: -0.03em;
  --word-display: normal;
  --track-mono: 0.02em;
}

html:has(#announcement-bar) {
  --session-bar-height: 2.25rem;
}

/* Base — solid paper (no kolam / dotted screen) */
html {
  background-color: var(--paper);
}
body {
  background-color: var(--paper);
  background-image: none;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.55;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: var(--track-display);
  color: var(--ink);
  text-wrap: balance;
}

::selection {
  background: color-mix(in srgb, var(--blueprint) 22%, transparent);
}

:focus-visible {
  outline: 2px solid var(--blueprint);
  outline-offset: 3px;
}

/* Chrome: kill SaaS glow / pill theater */
.announcement-bar {
  background: var(--signal) !important;
  color: var(--ink) !important;
  min-height: var(--session-bar-height);
  border-bottom: 1px solid color-mix(in srgb, var(--ink) 12%, transparent);
}
.announcement-bar__text {
  color: var(--ink) !important;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.02em;
  font-weight: 500;
}

.navbar.home-navbar,
.navbar {
  background: color-mix(in srgb, var(--paper) 92%, transparent) !important;
  border-bottom: 1px solid var(--border) !important;
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
}
.navbar.scrolled,
.home-navbar.scrolled {
  background: color-mix(in srgb, var(--paper) 96%, transparent) !important;
}

.nav-link,
.nav-more__toggle {
  font-family: var(--font-body) !important;
  font-weight: 500 !important;
  color: var(--ink-2) !important;
}
.nav-link:hover,
.nav-link[aria-current="page"],
.nav-more__toggle:hover {
  color: var(--ink) !important;
}

.btn-cta,
.nav-cta,
.drawer-cta,
.btn--primary,
.btn-pb-primary {
  background: var(--ink) !important;
  color: var(--paper) !important;
  border-radius: 2px !important;
  box-shadow: none !important;
  font-family: var(--font-body) !important;
  font-weight: 600 !important;
  letter-spacing: 0 !important;
}
.btn-cta:hover,
.nav-cta:hover,
.drawer-cta:hover,
.btn--primary:hover,
.btn-pb-primary:hover {
  background: var(--blueprint) !important;
  color: var(--paper) !important;
}

.btn--secondary,
.btn-pb-secondary {
  background: transparent !important;
  color: var(--ink) !important;
  border: 1px solid var(--border-strong) !important;
  border-radius: 2px !important;
  box-shadow: none !important;
}
.btn--secondary:hover,
.btn-pb-secondary:hover {
  border-color: var(--blueprint) !important;
  color: var(--blueprint) !important;
  background: transparent !important;
}

.nav-workshops-cta {
  border-radius: 2px !important;
  background: transparent !important;
  border: 1px solid var(--border) !important;
}
.nav-link__badge {
  background: var(--signal) !important;
  color: var(--ink) !important;
  border-radius: 2px !important;
  font-family: var(--font-mono) !important;
}

.eyebrow,
.hero-tag {
  font-family: var(--font-mono) !important;
  font-size: 0.75rem !important;
  letter-spacing: 0.08em !important;
  text-transform: uppercase !important;
  color: var(--blueprint) !important;
  font-weight: 500 !important;
}
.eyebrow::before,
.hero-tag::before {
  content: none !important;
  display: none !important;
}

.footer,
.page-footer {
  background: var(--ink) !important;
  color: color-mix(in srgb, var(--paper) 78%, transparent) !important;
  border-top: 0 !important;
}
.footer a,
.page-footer a {
  color: color-mix(in srgb, var(--paper) 86%, transparent) !important;
}
.footer a:hover,
.page-footer a:hover {
  color: var(--paper) !important;
}
.footer__workshops-band {
  background: color-mix(in srgb, var(--paper) 6%, transparent) !important;
  border: 1px solid color-mix(in srgb, var(--paper) 12%, transparent) !important;
  border-radius: 2px !important;
}
.footer .btn--primary,
.footer .btn-cta {
  background: var(--blueprint) !important;
}

/* Helpers */
.prose {
  font-family: var(--font-body);
  font-size: var(--step-1);
  line-height: 1.65;
  color: var(--ink-2);
  max-width: 62ch;
}
.back {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-weight: 600;
  color: var(--blueprint);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}
.mono-fact {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.02em;
  color: var(--ink-2);
}