/* ==========================================================================
   Design system — Matt Ratcliffe
   Dark navy base, neon cyan -> magenta gradient (from the MR logo), monospace type.
   ========================================================================== */

:root {
  /* Surfaces */
  --bg-0: #05070f;
  --bg-1: #0a0e1f;
  --bg-2: #0f1428;
  --bg-3: #141a33;
  --border: #232a4d;
  --border-soft: #1a2040;

  /* Neon accents (sampled from the logo gradient) */
  --cyan: #22e2ff;
  --cyan-soft: #22e2ff33;
  --blue: #4a6bff;
  --magenta: #d946f5;
  --magenta-soft: #d946f533;
  --gradient: linear-gradient(120deg, var(--cyan) 0%, var(--blue) 50%, var(--magenta) 100%);

  /* Text */
  --text-0: #eef2ff;
  --text-1: #aab3d6;
  --text-2: #8790b8;

  /* Type */
  --font-mono: 'JetBrains Mono', 'Courier New', Courier, monospace;

  /* Rhythm */
  --radius: 10px;
  --max-width: 1120px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-0);
  color: var(--text-0);
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
}

body {
  background:
    radial-gradient(60rem 30rem at 15% -10%, #16224a55, transparent 60%),
    radial-gradient(50rem 25rem at 110% 10%, #4a1a5a44, transparent 60%),
    var(--bg-0);
  min-height: 100vh;
}

h1, h2, h3, h4 {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-0);
  margin: 0 0 0.6em;
}

p { color: var(--text-1); margin: 0 0 1em; }

a { color: var(--cyan); text-decoration: none; }
a:hover { color: var(--magenta); }

code, pre { font-family: var(--font-mono); }

::selection { background: var(--magenta-soft); color: var(--text-0); }

/* -- Accessibility ---------------------------------------------------------*/

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--cyan);
  color: var(--bg-0);
  padding: 0.6em 1em;
  border-radius: 6px;
  font-weight: 700;
  z-index: 2000;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 1rem; color: var(--bg-0); }

a:focus-visible,
button:focus-visible,
.btn:focus-visible,
.card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-0); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: var(--cyan); }

/* -- Layout helpers ------------------------------------------------------ */

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--gutter); }

.section { padding: clamp(3rem, 8vw, 6rem) 0; border-bottom: 1px solid var(--border-soft); }

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 1rem;
}
.section-tag::before { content: '//'; color: var(--magenta); }

.section-title { font-size: clamp(1.6rem, 3vw, 2.4rem); margin-bottom: 0.4em; }
.section-lead { color: var(--text-1); max-width: 640px; }

/* -- Neon text / gradient ------------------------------------------------ */

.text-gradient {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.glow-cyan { text-shadow: 0 0 18px var(--cyan-soft); }
.glow-magenta { text-shadow: 0 0 18px var(--magenta-soft); }

/* -- Buttons -------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.75em 1.4em;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--bg-2);
  border-color: var(--cyan);
  color: var(--cyan);
}
.btn-primary:hover { color: var(--bg-0); background: var(--cyan); box-shadow: 0 0 24px var(--cyan-soft); }

.btn-ghost { background: transparent; border-color: var(--border); color: var(--text-1); }
.btn-ghost:hover { border-color: var(--magenta); color: var(--magenta); }

/* -- Cards -----------------------------------------------------------------*/

.card {
  background: linear-gradient(180deg, var(--bg-2), var(--bg-1));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem;
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.card::before {
  content: '';
  position: absolute;
  inset: 0;
  padding: 1px;
  border-radius: var(--radius);
  background: var(--gradient);
  opacity: 0;
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  transition: opacity 0.25s ease;
  pointer-events: none;
}
.card:hover { transform: translateY(-3px); }
.card:hover::before { opacity: 1; }

/* -- Boot screen (initial paint before Blazor hydrates) ------------------- */

.boot-screen { min-height: 100vh; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 1.4rem; }
.boot-logo { width: 88px; height: auto; filter: drop-shadow(0 0 26px #22e2ff55); animation: pulse 2.2s ease-in-out infinite; }
.boot-bar { width: 220px; height: 3px; background: var(--border); border-radius: 4px; overflow: hidden; }
.boot-bar span { display: block; height: 100%; width: 40%; background: var(--gradient); animation: sweep 1.2s ease-in-out infinite; }
.boot-text { font-size: 0.8rem; color: var(--text-2); letter-spacing: 0.08em; }

@keyframes sweep { 0% { transform: translateX(-120%); } 100% { transform: translateX(340%); } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.6; } }

#blazor-error-ui {
  background: #d946f522;
  border-top: 1px solid var(--magenta);
  color: var(--text-0);
  bottom: 0;
  box-shadow: 0 -1px 20px #00000066;
  display: none;
  left: 0;
  padding: 0.8rem 1.2rem;
  position: fixed;
  width: 100%;
  z-index: 1000;
  font-family: var(--font-mono);
}
#blazor-error-ui .dismiss { cursor: pointer; position: absolute; right: 1rem; top: 0.6rem; color: var(--text-1); }