/* skui-sapphire.css  deep navy / electric blue dark theme
   cobalt and electric-blue palette, clean geometric character,
   subtle diagonal dot-grid pattern on body,
   modern geometric sans typography */

@import url('../skui.css');

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;500;600;700;800&family=DM+Sans:ital,wght@0,300;0,400;0,500;0,600;1,400&display=swap');

:root {
  --bg-void:    hsl(222, 40%, 8%);
  --bg-deep:    hsl(220, 36%, 11%);
  --bg-base:    hsl(218, 32%, 14%);
  --bg-raised:  hsl(216, 28%, 18%);
  --bg-float:   hsl(214, 26%, 22%);
  --bg-hover:   hsl(212, 24%, 27%);

  --surf-t:     hsl(215, 28%, 21%);
  --surf-b:     hsl(220, 34%, 12%);
  --surf-btn-t: hsl(213, 26%, 25%);
  --surf-btn-b: hsl(220, 36%, 10%);

  --text-primary:   hsl(210, 80%, 95%);
  --text-secondary: hsl(212, 50%, 75%);
  --text-muted:     hsl(215, 28%, 50%);
  --text-inverse:   hsl(222, 40%, 8%);
  --text-link:      hsl(210, 100%, 72%);

  /* electric cobalt accent */
  --blue-t:    hsl(212, 100%, 62%);
  --blue-b:    hsl(218, 90%, 48%);
  --blue-lit:  hsl(205, 100%, 72%);
  --blue-dim:  hsl(224, 80%, 32%);

  /* electric cyan highlight */
  --secondary-t:    hsl(190, 90%, 55%);
  --secondary-b:    hsl(196, 80%, 40%);
  --secondary-lit:  hsl(184, 95%, 65%);
  --secondary-glow: rgba(20, 180, 220, 0.28);

  --danger-t:  #f04455;
  --danger-b:  #c81e35;
  --success-t: #30d890;
  --success-b: #18a860;
  --warn-t:    #f0c040;
  --warn-b:    #c89010;

  --border-hi:  rgba(80, 160, 255, 0.16);
  --border-lo:  rgba(10, 25, 60, 0.70);
  --border-mid: rgba(10, 25, 60, 0.40);

  --shadow-sm:    0 1px 4px rgba(0,0,0,0.50), 0 1px 0 rgba(80,160,255,0.08);
  --shadow-md:    0 4px 22px rgba(0,0,0,0.55), 0 1px 6px rgba(0,0,0,0.40);
  --shadow-lg:    0 10px 48px rgba(0,0,0,0.65), 0 3px 14px rgba(0,0,0,0.45);
  --shadow-inset: inset 0 2px 8px rgba(0,0,0,0.45), inset 0 1px 0 rgba(80,160,255,0.07);

  --bevel-hi: inset 0 1px 0 rgba(80, 160, 255, 0.14);
  --bevel-lo: inset 0 -1px 0 rgba(0, 0, 0, 0.55);

  --font-sans:    'DM Sans', 'Segoe UI', system-ui, sans-serif;
  --font-mono:    'Cascadia Code', 'Consolas', monospace;
  --font-display: 'Syne', 'DM Sans', sans-serif;
}

/* diagonal dot-grid + deep navy gradient */
body {
  background-color: hsl(222, 40%, 8%);
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='28' height='28'%3E%3Ccircle cx='14' cy='14' r='1.2' fill='rgba(60,120,255,0.09)'/%3E%3Ccircle cx='0' cy='0' r='0.8' fill='rgba(60,120,255,0.06)'/%3E%3Ccircle cx='28' cy='0' r='0.8' fill='rgba(60,120,255,0.06)'/%3E%3Ccircle cx='0' cy='28' r='0.8' fill='rgba(60,120,255,0.06)'/%3E%3Ccircle cx='28' cy='28' r='0.8' fill='rgba(60,120,255,0.06)'/%3E%3C/svg%3E"),
    radial-gradient(ellipse 60% 40% at 20% 15%, rgba(30,80,200,0.22) 0%, transparent 65%),
    radial-gradient(ellipse 45% 35% at 85% 75%, rgba(10,40,140,0.18) 0%, transparent 60%),
    linear-gradient(150deg,
      hsl(224,44%,9%)  0%,
      hsl(220,40%,10%) 35%,
      hsl(216,36%,13%) 65%,
      hsl(222,42%,8%)  100%
    );
  background-attachment: fixed;
}

body::before { opacity: 0.018; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

h5, h6 { font-family: var(--font-sans); }

/* panels have a faint blue-lit top edge */
.panel {
  background: linear-gradient(170deg, var(--bg-raised) 0%, var(--bg-float) 100%);
  border: 1px solid rgba(30, 80, 180, 0.35);
  box-shadow:
    var(--shadow-md),
    inset 0 1px 0 rgba(80,160,255,0.12),
    inset 0 -1px 0 rgba(0,0,0,0.45);
}

/* electric blue active button */
.btn--primary {
  background-color: var(--blue-b);
  background-image:
    linear-gradient(180deg,
      rgba(255,255,255,0.22)  0%,
      rgba(255,255,255,0.06) 49%,
      transparent            50%,
      rgba(0,0,0,0.08)       100%
    ),
    linear-gradient(180deg, var(--blue-t) 0%, var(--blue-b) 100%);
  border: 1px solid rgba(10,40,140,0.6);
  box-shadow:
    inset 0 1px 0 rgba(150,200,255,0.22),
    inset 0 -1px 0 rgba(0,0,0,0.45),
    0 3px 14px rgba(30,80,200,0.50),
    0 0 18px rgba(40,100,255,0.22);
  color: white;
  font-weight: 600;
}

.btn--primary:hover { filter: brightness(1.10); box-shadow: inset 0 1px 0 rgba(150,200,255,0.25), inset 0 -1px 0 rgba(0,0,0,0.45), 0 4px 18px rgba(30,80,200,0.60), 0 0 24px rgba(40,100,255,0.30); }

/* gold → cyan */
.btn--secondary {
  background-color: var(--secondary-b);
  background-image:
    linear-gradient(180deg,
      rgba(255,255,255,0.22)  0%,
      rgba(255,255,255,0.06) 49%,
      transparent            50%,
      rgba(0,0,0,0.08)       100%
    ),
    linear-gradient(180deg, var(--secondary-t) 0%, var(--secondary-b) 100%);
  border: 1px solid rgba(0,80,140,0.55);
  box-shadow:
    inset 0 1px 0 rgba(120,220,255,0.22),
    inset 0 -1px 0 rgba(0,0,0,0.45),
    0 3px 14px rgba(0,120,180,0.40),
    0 0 18px var(--secondary-glow);
  color: white;
}

.btn--secondary:hover { filter: brightness(1.08); }

/* scrollbar  navy tone */
::-webkit-scrollbar-track { background: var(--bg-void); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, hsl(215,28%,26%) 0%, hsl(220,34%,14%) 100%);
  border-color: var(--border-lo);
}

.tab--active,
.tab[aria-selected="true"] {
  background-color: var(--blue-b);
  background-image:
    linear-gradient(180deg,
      rgba(255,255,255,0.20)  0%,
      rgba(255,255,255,0.06) 49%,
      transparent            50%,
      rgba(0,0,0,0.06)       100%
    ),
    linear-gradient(180deg, var(--blue-t) 0%, var(--blue-b) 100%);
  color: white;
  border-color: rgba(10,40,140,0.55);
  box-shadow:
    inset 0 1px 0 rgba(150,200,255,0.18),
    inset 0 -1px 0 rgba(0,0,0,0.40),
    0 2px 12px rgba(30,80,200,0.45),
    0 0 14px rgba(40,100,255,0.18);
}

mark { background: rgba(30,100,255,0.22); color: hsl(212,100%,80%); }

blockquote {
  border-left-color: var(--blue-b);
  background: linear-gradient(90deg, rgba(30,100,255,0.08) 0%, transparent 100%);
}