/* =====================================================================
   Paradoxicity — launch / index page
   Dark, technical aesthetic. Single accent: phosphor green.
   ===================================================================== */

:root {
  --bg:          #0A0A0A;
  --bg-elev:     #101317;   /* card surface, slightly raised           */
  --bg-elev-2:   #14181d;   /* card hover surface                      */
  --border:      #1e242c;   /* default hairline border                 */
  --border-soft: #171b21;

  --text:        #dfe4ea;   /* primary body text  (~13:1 on --bg)      */
  --text-dim:    #9aa4b0;   /* secondary text     (~6.5:1 on --bg)     */
  --text-faint:  #7c8590;   /* tertiary / index numbers (~5:1 on --bg) */

  --accent:      #39FF88;   /* phosphor green — the single accent      */
  --accent-dim:  #2bd873;
  --accent-glow: rgba(57, 255, 136, 0.28);
  --accent-veil: rgba(57, 255, 136, 0.08);

  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', 'Menlo',
               'Consolas', monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI',
               Roboto, Helvetica, Arial, sans-serif;

  --maxw: 960px;
  --radius: 12px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* --- reset / base ---------------------------------------------------- */

*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, p { margin: 0; }

a { color: inherit; text-decoration: none; }

/* --- accessibility helpers ------------------------------------------ */

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 100;
  padding: 10px 16px;
  background: var(--accent);
  color: #05140b;
  font-family: var(--font-mono);
  font-weight: 700;
  border-radius: 8px;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 12px; }

/* Consistent, visible keyboard focus everywhere */
a:focus-visible,
.card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

/* =====================================================================
   Ambient background layers (all decorative)
   Kept very low-contrast so body/heading text stays well above WCAG AA.
   ===================================================================== */

.bg-grid,
.bg-scanlines,
.bg-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
}

/* faint technical grid */
.bg-grid {
  background-image:
    linear-gradient(to right,  rgba(255,255,255,0.022) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.022) 1px, transparent 1px);
  background-size: 44px 44px;
  /* fade the grid out toward the edges */
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 55%, transparent 100%);
          mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 55%, transparent 100%);
}

/* subtle scanline overlay */
.bg-scanlines {
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0) 0px,
    rgba(0, 0, 0, 0) 2px,
    rgba(0, 0, 0, 0.16) 3px
  );
  opacity: 0.35;
}

/* slow ambient accent glow, top-center */
.bg-glow {
  background:
    radial-gradient(60% 45% at 50% -8%, var(--accent-veil), transparent 70%),
    radial-gradient(80% 60% at 50% 0%, rgba(0, 217, 255, 0.0), transparent 70%);
}

/* =====================================================================
   Layout wrapper
   ===================================================================== */

.site-header,
main,
.site-footer {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 40px);
}

/* =====================================================================
   Header
   ===================================================================== */

.site-header {
  padding-top: clamp(64px, 12vh, 132px);
  padding-bottom: clamp(40px, 7vh, 72px);
}

.site-header__prompt {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  color: var(--text-faint);
  margin-bottom: 20px;
}
.site-header__user { color: var(--accent-dim); }
.site-header__at,
.site-header__path { color: var(--text-faint); }
.site-header__host { color: var(--text-dim); }

.site-title {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.6rem, 9vw, 5rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--text);
}

.cursor {
  color: var(--accent);
  font-weight: 500;
  margin-left: 0.04em;
  text-shadow: 0 0 12px var(--accent-glow);
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink {
  0%, 50%   { opacity: 1; }
  50.01%, 100% { opacity: 0; }
}

.site-tagline {
  font-family: var(--font-mono);
  font-size: clamp(0.9rem, 2.4vw, 1.05rem);
  color: var(--text-dim);
  margin-top: 20px;
  letter-spacing: 0.01em;
}

/* =====================================================================
   Project grid
   ===================================================================== */

main { flex: 1 0 auto; }

.project-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.5vw, 24px);
}

.project-grid__item { display: flex; }

/* --- card ------------------------------------------------------------ */

.card {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  width: 100%;
  padding: clamp(24px, 3vw, 34px);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition:
    transform 0.28s var(--ease),
    border-color 0.28s var(--ease),
    background-color 0.28s var(--ease),
    box-shadow 0.28s var(--ease);
}

/* top accent line that grows in on hover */
.card::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  height: 2px;
  width: 100%;
  background: linear-gradient(90deg, var(--accent), transparent 85%);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease);
  z-index: 1;
}

.card__index {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-faint);
  letter-spacing: 0.08em;
  margin-bottom: 18px;
  transition: color 0.28s var(--ease);
}

.card__title {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.3rem, 3.4vw, 1.6rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--text);
  transition: color 0.28s var(--ease);
}

.card__desc {
  margin-top: 12px;
  color: var(--text-dim);
  font-size: 0.98rem;
  max-width: 46ch;
}

.card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--border-soft);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.card__path {
  color: var(--text-faint);
  letter-spacing: 0.01em;
  word-break: break-all;
}

.card__launch {
  color: var(--accent);
  font-weight: 500;
  white-space: nowrap;
  transition: transform 0.28s var(--ease), text-shadow 0.28s var(--ease);
}

/* --- card hover / focus states -------------------------------------- */

.card:hover,
.card:focus-visible {
  transform: translateY(-4px);
  background: var(--bg-elev-2);
  border-color: var(--accent-dim);
  box-shadow:
    0 14px 40px -18px rgba(0, 0, 0, 0.8),
    0 0 0 1px var(--accent-veil),
    0 0 34px -8px var(--accent-glow);
}
.card:hover::before,
.card:focus-visible::before { transform: scaleX(1); }

.card:hover .card__title,
.card:focus-visible .card__title { color: var(--accent); }

.card:hover .card__index,
.card:focus-visible .card__index { color: var(--accent-dim); }

.card:hover .card__launch,
.card:focus-visible .card__launch {
  transform: translateX(4px);
  text-shadow: 0 0 14px var(--accent-glow);
}

.card:active { transform: translateY(-1px); }

/* =====================================================================
   Footer
   ===================================================================== */

.site-footer {
  padding-top: clamp(48px, 9vh, 96px);
  padding-bottom: 40px;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
}

/* =====================================================================
   Scroll-in animation (progressive enhancement — see script.js)
   ===================================================================== */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* =====================================================================
   Responsive — collapse 2x2 grid to a single column
   ===================================================================== */

@media (max-width: 640px) {
  .project-grid { grid-template-columns: 1fr; }
  .bg-scanlines { opacity: 0.25; }
}

/* =====================================================================
   Reduced motion — honor the user's preference
   ===================================================================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .cursor { opacity: 1; }
  .reveal { opacity: 1; transform: none; }
  .card:hover,
  .card:focus-visible { transform: none; }
}