/* ============================================
   SYNAPSE CIRCUITS - Design Tokens
   ============================================ */

:root {
  /* ── Colours ── */
  --color-primary:        #0A7289;
  --color-primary-dark:   #071B24;
  --color-primary-darker: #050F16;
  --color-accent-cyan:    #28D4E8;
  --color-accent-blue:    #236BFE;
  --color-bg-light:       #F4FAFC;
  --color-bg-white:       #FFFFFF;
  --color-text-main:      #1E252B;
  --color-text-muted:     #6B7A86;
  --color-text-light:     #A0B0BA;
  --color-text-white:     #F0F6F8;
  --color-border:         #D7E5EA;
  --color-border-dark:    rgba(40, 212, 232, 0.12);

  /* Gradients */
  --gradient-primary:     linear-gradient(135deg, #0A7289 0%, #28D4E8 100%);
  --gradient-hero:        linear-gradient(180deg, #071B24 0%, #0C2A38 50%, #071B24 100%);
  --gradient-dark-card:   linear-gradient(145deg, rgba(10, 114, 137, 0.08) 0%, rgba(40, 212, 232, 0.04) 100%);
  --gradient-glow:        radial-gradient(ellipse at center, rgba(40, 212, 232, 0.15) 0%, transparent 70%);
  --gradient-cta:         linear-gradient(135deg, #0A7289 0%, #0D8BA6 50%, #28D4E8 100%);

  /* ── Typography ── */
  --font-heading:   'Space Grotesk', sans-serif;
  --font-body:      'Inter', sans-serif;

  --fs-hero:        clamp(2.5rem, 5vw, 4rem);
  --fs-h1:          clamp(2rem, 4vw, 3rem);
  --fs-h2:          clamp(1.75rem, 3vw, 2.5rem);
  --fs-h3:          1.25rem;
  --fs-h4:          1.125rem;
  --fs-body:        1rem;
  --fs-body-lg:     1.125rem;
  --fs-small:       0.875rem;
  --fs-xs:          0.75rem;

  --fw-regular:     400;
  --fw-medium:      500;
  --fw-semibold:    600;
  --fw-bold:        700;

  --lh-tight:       1.2;
  --lh-normal:      1.6;
  --lh-relaxed:     1.8;

  --ls-tight:       -0.02em;
  --ls-normal:      0;
  --ls-wide:        0.05em;
  --ls-wider:       0.1em;

  /* ── Spacing ── */
  --space-xs:       0.25rem;
  --space-sm:       0.5rem;
  --space-md:       1rem;
  --space-lg:       1.5rem;
  --space-xl:       2rem;
  --space-2xl:      3rem;
  --space-3xl:      4rem;
  --space-4xl:      6rem;
  --space-5xl:      8rem;

  /* ── Layout ── */
  --container-max:  1200px;
  --container-wide: 1400px;
  --container-narrow: 800px;

  /* ── Borders ── */
  --radius-sm:      6px;
  --radius-md:      10px;
  --radius-lg:      16px;
  --radius-xl:      24px;
  --radius-full:    9999px;

  /* ── Shadows ── */
  --shadow-sm:      0 1px 3px rgba(7, 27, 36, 0.06);
  --shadow-md:      0 4px 12px rgba(7, 27, 36, 0.08);
  --shadow-lg:      0 8px 30px rgba(7, 27, 36, 0.12);
  --shadow-xl:      0 16px 50px rgba(7, 27, 36, 0.16);
  --shadow-glow:    0 0 30px rgba(40, 212, 232, 0.2);
  --shadow-glow-sm: 0 0 15px rgba(40, 212, 232, 0.15);
  --shadow-card:    0 2px 8px rgba(7, 27, 36, 0.06), 0 8px 24px rgba(7, 27, 36, 0.04);

  /* ── Transitions ── */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* ── Z-Index ── */
  --z-bg:       -1;
  --z-base:     1;
  --z-card:     10;
  --z-nav:      100;
  --z-overlay:  200;
  --z-modal:    300;

  /* ── Semantic Theme Colors (Light Mode default) ── */
  --theme-bg:                      var(--color-bg-white);
  --theme-bg-alt:                  var(--color-bg-light);
  --theme-text:                    var(--color-text-main);
  --theme-text-muted:              var(--color-text-muted);
  --theme-text-light:              var(--color-text-light);
  --theme-text-inv:                var(--color-text-white);
  --theme-border:                  var(--color-border);
  --theme-card-bg:                 var(--color-bg-white);
  --theme-card-border:             var(--color-border);
  --theme-card-icon-color:         var(--color-primary);
  --theme-card-icon-bg:            linear-gradient(135deg, rgba(10, 114, 137, 0.1) 0%, rgba(40, 212, 232, 0.06) 100%);
  --theme-pricing-featured-bg:     rgba(10, 114, 137, 0.03);
  --theme-pricing-featured-border: var(--color-primary);
  --theme-pricing-label-color:     var(--color-primary);
  --theme-badge-bg:                rgba(10, 114, 137, 0.08);
  --theme-badge-color:             var(--color-primary);
  --theme-badge-border:            transparent;
  --theme-dot-color:               var(--color-primary);
  --theme-nav-bg:                  rgba(255, 255, 255, 0.92);
  --theme-nav-border:              rgba(10, 114, 137, 0.08);
  --theme-nav-link-color:          var(--color-text-muted);
  --theme-nav-link-hover:          var(--color-primary);
  --theme-shadow:                  var(--shadow-md);
  --theme-shadow-glow:             var(--shadow-glow-sm);
  --theme-focus-shadow:            rgba(10, 114, 137, 0.15);
  --theme-input-bg:                var(--color-bg-white);
  --theme-card-hover-border:       rgba(10, 114, 137, 0.2);
  --theme-card-hover-bg:           var(--color-bg-white);
  --theme-card-accent-border:      var(--color-primary);
  --theme-checkmark-svg:           url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%230A7289'%3E%3Cpath fill-rule='evenodd' d='M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z'/%3E%3C/svg%3E");

  /* Canvas light theme variables */
  --canvas-bg:                     var(--color-bg-white);
  --canvas-node:                   rgba(10, 114, 137, 0.4);
  --canvas-node-glow:              rgba(10, 114, 137, 0.08);
  --canvas-connection:             rgba(10, 114, 137, 0.06);
  --canvas-connection-active:      rgba(10, 114, 137, 0.15);
  --canvas-accent-node:            rgba(10, 114, 137, 0.85);
  --canvas-text:                   var(--color-text-main);
}

[data-theme="dark"] {
  /* Dark Mode Semantic Mappings */
  --theme-bg:                      var(--color-primary-darker);
  --theme-bg-alt:                  var(--color-primary-dark);
  --theme-text:                    var(--color-text-white);
  --theme-text-muted:              var(--color-text-light);
  --theme-text-light:              var(--color-text-muted);
  --theme-text-inv:                var(--color-text-main);
  --theme-border:                  var(--color-border-dark);
  --theme-card-bg:                 rgba(7, 27, 36, 0.6);
  --theme-card-border:             rgba(40, 212, 232, 0.12);
  --theme-card-icon-color:         var(--color-accent-cyan);
  --theme-card-icon-bg:            linear-gradient(135deg, rgba(40, 212, 232, 0.15) 0%, rgba(10, 114, 137, 0.1) 100%);
  --theme-pricing-featured-bg:     rgba(10, 114, 137, 0.1);
  --theme-pricing-featured-border: var(--color-accent-cyan);
  --theme-pricing-label-color:     var(--color-accent-cyan);
  --theme-badge-bg:                rgba(40, 212, 232, 0.1);
  --theme-badge-color:             var(--color-accent-cyan);
  --theme-badge-border:            rgba(40, 212, 232, 0.15);
  --theme-dot-color:               var(--color-accent-cyan);
  --theme-nav-bg:                  rgba(7, 27, 36, 0.92);
  --theme-nav-border:              rgba(40, 212, 232, 0.08);
  --theme-nav-link-color:          var(--color-text-light);
  --theme-nav-link-hover:          var(--color-accent-cyan);
  --theme-shadow:                  0 10px 40px rgba(0, 0, 0, 0.3);
  --theme-shadow-glow:             var(--shadow-glow);
  --theme-focus-shadow:            rgba(40, 212, 232, 0.15);
  --theme-input-bg:                var(--color-primary-dark);
  --theme-card-hover-border:       rgba(40, 212, 232, 0.3);
  --theme-card-hover-bg:           rgba(10, 114, 137, 0.08);
  --theme-card-accent-border:      var(--color-accent-cyan);
  --theme-checkmark-svg:           url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%2328D4E8'%3E%3Cpath fill-rule='evenodd' d='M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z'/%3E%3C/svg%3E");

  /* Canvas dark theme variables */
  --canvas-bg:                     var(--color-primary-darker);
  --canvas-node:                   rgba(40, 212, 232, 0.5);
  --canvas-node-glow:              rgba(40, 212, 232, 0.12);
  --canvas-connection:             rgba(40, 212, 232, 0.06);
  --canvas-connection-active:      rgba(40, 212, 232, 0.2);
  --canvas-accent-node:            rgba(10, 114, 137, 0.8);
  --canvas-text:                   var(--color-text-white);
}