/* ==========================================================================
   Kbong Pte. Ltd. — Custom Software Development
   Core stylesheet (Tailwind CDN handles utility classes; this file holds
   brand tokens, bespoke components, and refinements Tailwind can't do alone)
   ========================================================================== */

:root {
  --kb-navy-950: #060b16;
  --kb-navy-900: #0a1224;
  --kb-navy-800: #0f1b33;
  --kb-navy-700: #152342;
  --kb-navy-600: #1c2f56;
  --kb-slate-300: #b9c3d6;
  --kb-slate-400: #8b98b3;
  --kb-cyan-400: #35d0e0;
  --kb-cyan-300: #6ee3ee;
  --kb-amber-400: #f0b429;
  --kb-white: #f7f9fc;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--kb-navy-950);
  color: var(--kb-white);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

h1, h2, h3, h4, .font-display {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
}

/* ---- Reusable brand tokens as utility-like classes ---- */
.text-kb-cyan { color: var(--kb-cyan-400); }
.bg-kb-navy-950 { background-color: var(--kb-navy-950); }
.bg-kb-navy-900 { background-color: var(--kb-navy-900); }
.bg-kb-navy-800 { background-color: var(--kb-navy-800); }
.border-kb-navy-700 { border-color: var(--kb-navy-700); }

/* ---- Grid / dot pattern background ---- */
.kb-grid-bg {
  background-image:
    linear-gradient(rgba(53, 208, 224, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(53, 208, 224, 0.06) 1px, transparent 1px);
  background-size: 44px 44px;
}

.kb-radial-glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at 20% 10%, rgba(53, 208, 224, 0.18), transparent 45%),
              radial-gradient(circle at 85% 30%, rgba(240, 180, 41, 0.10), transparent 40%);
}

/* ---- Nav ---- */
#site-header {
  backdrop-filter: blur(14px);
  background: rgba(6, 11, 22, 0.82);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.kb-logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--kb-cyan-400), var(--kb-navy-600));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  color: var(--kb-navy-950);
  font-size: 16px;
  flex-shrink: 0;
}

.nav-link {
  position: relative;
  color: var(--kb-slate-300);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: color 0.2s ease;
}
.nav-link:hover { color: var(--kb-white); }
.nav-link.is-active { color: var(--kb-cyan-300); }
.nav-link.is-active::after {
  content: '';
  position: absolute;
  left: 0; bottom: -8px;
  width: 100%; height: 2px;
  background: var(--kb-cyan-400);
  border-radius: 2px;
}

/* ---- Buttons ---- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--kb-cyan-400), #1aa9bb);
  color: #05131a;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.78rem 1.6rem;
  border-radius: 8px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 8px 24px -8px rgba(53, 208, 224, 0.45);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px -6px rgba(53, 208, 224, 0.55);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--kb-white);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.75rem 1.55rem;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.18);
  transition: border-color 0.2s ease, background 0.2s ease;
}
.btn-secondary:hover {
  border-color: var(--kb-cyan-400);
  background: rgba(53, 208, 224, 0.06);
}

/* ---- Cards ---- */
.kb-card {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.015));
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 14px;
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}
.kb-card:hover {
  transform: translateY(-4px);
  border-color: rgba(53, 208, 224, 0.35);
  background: linear-gradient(180deg, rgba(53,208,224,0.06), rgba(255,255,255,0.02));
}

.kb-icon-badge {
  width: 46px;
  height: 46px;
  border-radius: 10px;
  background: rgba(53, 208, 224, 0.12);
  color: var(--kb-cyan-300);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
}

.kb-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--kb-cyan-300);
  background: rgba(53, 208, 224, 0.10);
  border: 1px solid rgba(53, 208, 224, 0.25);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
}

/* ---- Process step connector ---- */
.kb-step-num {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(53, 208, 224, 0.4);
  color: var(--kb-cyan-300);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  flex-shrink: 0;
  background: var(--kb-navy-900);
}

.kb-step-line {
  width: 1px;
  flex: 1;
  background: linear-gradient(180deg, rgba(53,208,224,0.5), transparent);
}

/* ---- Section divider label ---- */
.kb-eyebrow {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--kb-cyan-400);
}

/* ---- Footer ---- */
#site-footer a { color: var(--kb-slate-300); }
#site-footer a:hover { color: var(--kb-cyan-300); }

/* ---- Mobile nav ---- */
#mobile-menu { display: none; }
#mobile-menu.open { display: block; }

/* ---- Scroll fade-in ---- */
.kb-fade-up {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.kb-fade-up.kb-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---- Misc ---- */
.kb-hairline {
  border-top: 1px solid rgba(255,255,255,0.08);
}

.kb-quote-mark {
  font-family: 'Space Grotesk', serif;
  font-size: 3.5rem;
  line-height: 1;
  color: rgba(53, 208, 224, 0.35);
}

::selection {
  background: rgba(53, 208, 224, 0.35);
}

/* Scrollbar */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--kb-navy-950); }
::-webkit-scrollbar-thumb { background: var(--kb-navy-700); border-radius: 6px; }