/* ============================================================
   Signal Dynamics - Core Tokens
   Colors, Typography, Spacing, Radii, Shadows
   ============================================================ */

/* ---------- Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* Forma DJR Text - Signal Dynamics brand display face (italic bold) */
@font-face {
  font-family: 'Forma DJR Text';
  src: url('fonts/FormaDJRText-BoldItalic.otf') format('opentype');
  font-weight: 700;
  font-style: italic;
  font-display: swap;
}

:root {
  /* ==========================================================
     BRAND COLORS - sampled from logo & marketing background
     ========================================================== */

  /* Signal Blue - the "Signal" wordmark, primary brand color */
  --sd-blue-50:  #e6f3fb;
  --sd-blue-100: #c1e0f3;
  --sd-blue-200: #8cc7e8;
  --sd-blue-300: #4aa8d8;
  --sd-blue-400: #2a8ec5;
  --sd-blue-500: #1878b1;   /* PRIMARY - logo blue */
  --sd-blue-600: #146596;
  --sd-blue-700: #10537b;
  --sd-blue-800: #0c4162;
  --sd-blue-900: #082e46;

  /* Cyan - bright accent from marketing background gradient */
  --sd-cyan-300: #4dc3ff;
  --sd-cyan-400: #1eb0ff;
  --sd-cyan-500: #00aaff;   /* gradient start */
  --sd-cyan-600: #0d8ed3;   /* mid */
  --sd-cyan-700: #1772a6;   /* lower mid */
  --sd-cyan-800: #19618a;   /* gradient end */

  /* Dynamics Gray - neutral ramp, anchored to wordmark gray */
  --sd-gray-0:   #ffffff;
  --sd-gray-50:  #f6f7f8;
  --sd-gray-100: #eceef0;
  --sd-gray-200: #d6d9dc;
  --sd-gray-300: #b4b8bc;
  --sd-gray-400: #888c90;
  --sd-gray-500: #606366;
  --sd-gray-600: #444645;   /* PRIMARY - logo "Dynamics" gray */
  --sd-gray-700: #33353a;
  --sd-gray-800: #23262c;
  --sd-gray-900: #14171c;

  /* Navy - dark-background logo variant */
  --sd-navy-500: #233049;
  --sd-navy-600: #1c2740;
  --sd-navy-700: #1a2238;   /* dark-mode canvas */
  --sd-navy-800: #131a2c;
  --sd-navy-900: #0b1122;

  /* ==========================================================
     SEMANTIC STATUS - mission-critical telemetry palette
     (instrument-panel feel: clear, high-contrast, unambiguous)
     ========================================================== */
  --sd-status-nominal:   #16a36b;   /* green - link-locked, operational */
  --sd-status-nominal-bg:#e6f6ee;
  --sd-status-warning:   #d98a17;   /* amber - degraded, attention */
  --sd-status-warning-bg:#fdf3e3;
  --sd-status-fault:     #c8321f;   /* red - fault, link-loss */
  --sd-status-fault-bg:  #fbe9e6;
  --sd-status-info:      #1878b1;   /* blue - informational */
  --sd-status-info-bg:   #e6f3fb;
  --sd-status-offline:   #888c90;   /* gray - standby, not reporting */

  /* ==========================================================
     SEMANTIC TOKENS - light theme (default)
     ========================================================== */
  --bg-canvas:    var(--sd-gray-50);
  --bg-surface:   #ffffff;
  --bg-raised:    #ffffff;
  --bg-sunken:    var(--sd-gray-100);
  --bg-inverse:   var(--sd-navy-700);

  --fg-primary:   var(--sd-gray-900);
  --fg-secondary: var(--sd-gray-600);
  --fg-muted:     var(--sd-gray-500);
  --fg-subtle:    var(--sd-gray-400);
  --fg-inverse:   #ffffff;
  --fg-brand:     var(--sd-blue-500);
  --fg-link:      var(--sd-blue-600);

  --border-subtle:  var(--sd-gray-100);
  --border-default: var(--sd-gray-200);
  --border-strong:  var(--sd-gray-300);
  --border-focus:   var(--sd-blue-500);

  --accent:       var(--sd-blue-500);
  --accent-hover: var(--sd-blue-600);
  --accent-press: var(--sd-blue-700);

  /* ==========================================================
     TYPOGRAPHY
     Display : Forma DJR Text (Bold Italic) - the brand wordmark face
     UI/Body : Inter - neutral, readable, engineering-appropriate
     Mono    : JetBrains Mono - for specs, telemetry, SNs
     ========================================================== */
  --font-display: 'Forma DJR Text', 'Arial Narrow', sans-serif;
  --font-body:    'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono:    'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;

  /* Fluid type scale - mission-critical means legible */
  --fs-xs:    12px;
  --fs-sm:    13px;
  --fs-base:  15px;
  --fs-md:    16px;
  --fs-lg:    18px;
  --fs-xl:    22px;
  --fs-2xl:   28px;
  --fs-3xl:   36px;
  --fs-4xl:   48px;
  --fs-5xl:   64px;
  --fs-6xl:   84px;

  --lh-tight:   1.1;
  --lh-snug:    1.25;
  --lh-normal:  1.5;
  --lh-relaxed: 1.65;

  --tracking-tight:  -0.02em;
  --tracking-normal: 0;
  --tracking-wide:   0.04em;
  --tracking-wider:  0.08em;    /* eyebrow labels, SPEC CALLOUTS */
  --tracking-widest: 0.18em;    /* section dividers */

  /* ==========================================================
     SPACING - 4px base grid
     ========================================================== */
  --sp-0:  0;
  --sp-1:  4px;
  --sp-2:  8px;
  --sp-3:  12px;
  --sp-4:  16px;
  --sp-5:  20px;
  --sp-6:  24px;
  --sp-8:  32px;
  --sp-10: 40px;
  --sp-12: 48px;
  --sp-16: 64px;
  --sp-20: 80px;
  --sp-24: 96px;

  /* ==========================================================
     RADII - subtle. Industrial product, not consumer-soft.
     ========================================================== */
  --radius-sm:  2px;
  --radius-md:  4px;
  --radius-lg:  6px;
  --radius-xl:  10px;
  --radius-pill: 999px;

  /* ==========================================================
     ELEVATION - flat, precise shadows. No drama.
     ========================================================== */
  --shadow-xs:   0 1px 2px rgba(20, 23, 28, 0.06);
  --shadow-sm:   0 1px 3px rgba(20, 23, 28, 0.08), 0 1px 2px rgba(20, 23, 28, 0.04);
  --shadow-md:   0 4px 12px rgba(20, 23, 28, 0.08), 0 1px 3px rgba(20, 23, 28, 0.06);
  --shadow-lg:   0 12px 32px rgba(20, 23, 28, 0.12), 0 2px 8px rgba(20, 23, 28, 0.06);
  --shadow-inset: inset 0 1px 0 rgba(255,255,255,0.5), inset 0 -1px 0 rgba(20,23,28,0.04);

  /* Blue focus ring */
  --ring: 0 0 0 3px rgba(24, 120, 177, 0.32);

  /* ==========================================================
     MOTION
     ========================================================== */
  --ease-standard: cubic-bezier(0.2, 0, 0.1, 1);
  --ease-entrance: cubic-bezier(0, 0, 0.2, 1);
  --ease-exit:     cubic-bezier(0.4, 0, 1, 1);
  --dur-fast:   120ms;
  --dur-base:   180ms;
  --dur-slow:   280ms;
}

/* ==========================================================
   SEMANTIC TYPE STYLES - use these; don't restyle from scratch
   ========================================================== */

html, body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--fg-primary);
  background: var(--bg-canvas);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.sd-display,
h1.sd-display {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 800;
  font-size: var(--fs-6xl);
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--fg-primary);
}

h1, .sd-h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-4xl);
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-tight);
}

h2, .sd-h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-3xl);
  line-height: var(--lh-snug);
}

h3, .sd-h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-2xl);
  line-height: var(--lh-snug);
}

h4, .sd-h4 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--fs-lg);
  line-height: var(--lh-snug);
}

.sd-eyebrow {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--fg-brand);
}

.sd-divider-label {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-widest);
  color: var(--fg-muted);
}

p, .sd-body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: var(--lh-relaxed);
  color: var(--fg-primary);
}

.sd-lead {
  font-family: var(--font-body);
  font-size: var(--fs-lg);
  line-height: var(--lh-relaxed);
  color: var(--fg-secondary);
}

.sd-small {
  font-size: var(--fs-sm);
  color: var(--fg-muted);
}

code, .sd-mono, .sd-spec {
  font-family: var(--font-mono);
  font-size: 0.92em;
  letter-spacing: 0;
}

.sd-spec-callout {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--fg-secondary);
}

/* Brand "SIGNAL DYNAMICS"-style wordmark treatment - italic condensed */
.sd-wordmark-treatment {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 800;
  letter-spacing: var(--tracking-tight);
}
.sd-wordmark-treatment .blue { color: var(--sd-blue-500); }
.sd-wordmark-treatment .gray { color: var(--sd-gray-600); }