/* ---------------------------
   bellis.tech minimal theme
   - lean, modern, accessible
   - white glass cards, black text
   - responsive logo and grid
---------------------------- */

/* CSS Reset (small) */
*,
*::before,
*::after { box-sizing: border-box; }
html:focus-within { scroll-behavior: smooth; }
html, body { height: 100%; }
body, h1, h2, h3, h4, p, ul { margin: 0; }
ul { padding: 0; list-style: none; }

/* Theme tokens */
:root {
  --bg: #0a0b0d;            /* page background */
  --ink: #0f1115;           /* base text on white cards */
  --ink-muted: #4a5160;

  --card-bg: rgba(255, 255, 255, 0.85);  /* white w/ slight opacity */
  --card-border: rgba(12, 18, 28, 0.06);
  --ring: rgba(34, 150, 255, 0.35);

  --brand: #2296ff;
  --brand-ink: #0b3b66;

  --wrap: 1120px;
  --radius: 16px;
  --shadow: 0 8px 24px rgba(0,0,0,0.12);
  --shadow-soft: 0 4px 16px rgba(0,0,0,0.08);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;

  --font-sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --lh: 1.55;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4f6fb;          /* subtle light background */
  }
}

/* Base */
body {
  font-family: var(--font-sans);
  background: radial-gradient(1200px 600px at 10% -10%, #10203a 0%, transparent 55%),
              radial-gradient(1200px 600px at 110% 10%, #1b2b40 0%, transparent 55%),
              var(--bg);
  color: #101218;
  line-height: var(--lh);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Accessibility */
.skip-link {
  position: absolute;
  left: -9999px;
  top: -9999px;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
  background: #fff;
  color: #000;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  outline: 2px solid var(--brand);
}

/* Layout primitives */
.wrap {
  width: min(100% - 2rem, var(--wrap));
  margin-inline: auto;
}
.section {
  padding: clamp(2.5rem, 4vw, 4rem) 0;
}
.grid {
  display: grid;
  gap: var(--space-8);
}
@media (min-width: 860px) {
  .grid {
    grid-template-columns: 2fr 1fr;
  }
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-top: 4px solid transparent;
  background: linear-gradient(to bottom, rgba(10, 10, 20, 0.95), rgba(34, 150, 255, 0.92));
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);  
  backdrop-filter: saturate(160%) blur(15px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}
.brand-logo {
  height: clamp(36px, 6vw, 56px);   /* responsive logo scaling */
  width: auto;
  aspect-ratio: auto;
  image-rendering: -webkit-optimize-contrast;
}
.brand-text {
  color: #eaf2ff;
  letter-spacing: 0.08em;
  font-weight: 700;
  font-size: clamp(0.9rem, 1.2vw, 1.05rem);
}

.site-nav ul { display: flex; gap: var(--space-6); }
.site-nav a {
  color: #dfe7f3;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  opacity: 0.9;
}
.site-nav a:hover,
.site-nav a:focus {
  opacity: 1;
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

/* Hero */
.hero {
  padding: clamp(3rem, 6vw, 6rem) 0 clamp(2.5rem, 4vw, 4rem);
}
.hero-inner {
  display: grid;
  gap: var(--space-6);
  text-align: left;
}
.hero-title {
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  color: #f1f5ff;
  letter-spacing: -0.02em;
}
.hero-subtitle {
  color: #cbd7e8;
  max-width: 62ch;
  font-size: clamp(1rem, 1.2vw, 1.1rem);
}
.hero-cta { display: flex; gap: var(--space-4); }

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.7rem 1rem;
  border-radius: 999px;
  background: var(--brand);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(255,255,255,0.15);
  transition: transform 120ms ease, filter 120ms ease;
}
.btn:hover { transform: translateY(-1px); filter: brightness(1.05); }
.btn:focus { outline: 3px solid var(--ring); outline-offset: 2px; }
.btn:active { transform: translateY(0); }
.btn-ghost {
  background: transparent;
  color: #e6f1ff;
  border: 1px solid rgba(230, 241, 255, 0.45);
}

/* Cards (white, slightly transparent) */
.card {
  background: var(--card-bg);
  color: var(--ink);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(1rem, 2vw, 1.5rem);
  backdrop-filter: blur(8px);
}
.card-title {
  font-size: clamp(1.25rem, 1.8vw, 1.4rem);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-3);
  color: var(--ink);
}
.card p { color: var(--ink-muted); }

/* Inline lists & tags */
.list-inline {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
  margin-top: var(--space-3);
}
.list-inline li {
  padding: 0.35rem 0.6rem;
  background: rgba(255,255,255,0.65);
  border: 1px solid rgba(16, 17, 21, 0.08);
  border-radius: 999px;
  font-size: 0.9rem;
}

.list { display: grid; gap: 0.5rem; }
.list li { color: var(--ink-muted); }

.tag-row { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-3); }
.tag {
  display: inline-block;
  font: 600 0.8rem/1 var(--font-sans);
  padding: 0.4rem 0.6rem;
  border-radius: 7px;
  background: #eff6ff;
  color: var(--brand-ink);
  border: 1px solid rgba(34,150,255,0.25);
}

.actions { display: flex; gap: var(--space-3); margin-top: var(--space-4); }

/* Footer */
.site-footer {
  padding: var(--space-8) 0;
  color: #9fb3cc;
  text-align: center;
  font-size: 0.95rem;
}

/* Reduce motion for those who prefer it */
@media (prefers-reduced-motion: reduce) {
  html:focus-within { scroll-behavior: auto; }
  .btn { transition: none; }
}

/* Small screens */
@media (max-width: 720px) {
  .site-nav ul { gap: var(--space-4); }
  .brand-text { display: none; } /* keep the header compact on phones */
}