/*
 * technical.css — Foundation for the technical-dense archetype
 *
 * Archetype ID: technical-dense
 * Craft profile (reference-corpus.md):
 *   radius system: tight — 8px card / 6px input / 4px button
 *   button style:  sharp, mono-label; no gradient; high-contrast border on ghost
 *   divider style: hairline 1px solid at 8% opacity
 *   icon treatment: monochrome, small (16px), uniform
 *
 * Override --color-accent (and related tokens) via a :root block in the
 * generated page to brand this foundation without touching the file.
 *
 * Issue: #1048 — custom CSS component library per archetype
 */

/* --- 1. Design Tokens --- */

:root {
  /* Accent — override per brand */
  --color-accent:          #0ea5e9;          /* cool sky blue default */
  --color-accent-subtle:   rgba(14, 165, 233, 0.10);
  --color-accent-hover:    rgba(14, 165, 233, 0.16);

  /* Surface palette — dark-first technical */
  --color-bg:              #0d1117;
  --color-bg-raised:       #161b22;
  --color-bg-sunken:       #090d13;
  --color-fg:              #e6edf3;
  --color-fg-muted:        #8b949e;
  --color-fg-faint:        #484f58;
  --color-border:          rgba(240, 246, 252, 0.08);
  --color-border-strong:   rgba(240, 246, 252, 0.14);

  /* Code surface */
  --code-bg:               rgba(240, 246, 252, 0.06);

  /* Radius system — tight, at least 3 distinct values (N13 compliance) */
  --radius-sm:             2px;             /* tags / micro elements */
  --radius-btn:            4px;             /* button — tight, sharp */
  --radius-input:          6px;             /* input — slightly more than button */
  --radius-card:           8px;             /* card — most generous in this system */
  --radius-pill:           9999px;          /* pill badge */

  /* Shadow tokens — cool, flat, low-spread */
  --shadow-card:           0 1px 3px rgba(0, 0, 0, 0.24),
                           0 0 0 1px rgba(240, 246, 252, 0.08);
  --shadow-card-hover:     0 4px 16px rgba(0, 0, 0, 0.32),
                           0 0 0 1px rgba(240, 246, 252, 0.14);
  --shadow-btn:            none;            /* technical: no shadow on primary */
  --shadow-elevated:       0 8px 32px rgba(0, 0, 0, 0.40);

  /* Transition — crisp, fast */
  --transition-fast:       120ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base:       200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow:       320ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Spacing scale */
  --space-1:4px; --space-2:8px; --space-3:12px; --space-4:16px;
  --space-6:24px; --space-8:32px; --space-12:48px; --space-16:64px; --space-24:96px;

  /* Icon sizing — uniform 16px (craft profile: monochrome, small, uniform) */
  --icon-feature: 16px;
  --icon-nav:     16px;
  --icon-inline:  14px;
}

/* --- 2. Element Overrides (N18 compliance) --- */

/* Custom selection — cool accent tint */
::selection {
  background: var(--color-accent-subtle);
  color:      var(--color-fg);
}

/* Custom focus ring — technical accent (N18, N15 compliance) */
:focus-visible {
  outline:        2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Custom scrollbar — thin, cool-dark theme */
::-webkit-scrollbar       { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: var(--color-bg-sunken); }
::-webkit-scrollbar-thumb {
  background:    var(--color-border-strong);
  border-radius: var(--radius-sm);
}
::-webkit-scrollbar-thumb:hover { background: var(--color-fg-muted); }

/* Code blocks — dark, dense */
code, kbd {
  background:    var(--code-bg);
  border-radius: var(--radius-sm);
  padding:       2px 6px;
  font-size:     0.875em;
  font-family:   ui-monospace, SFMono-Regular, Menlo, monospace;
  color:         var(--color-fg);
  border:        1px solid var(--color-border);
}

/* Links — custom underline treatment (N17 compliance) */
a:not([class]) {
  color:                    var(--color-accent);
  text-decoration:          underline;
  text-decoration-color:    transparent;
  text-underline-offset:    3px;
  text-decoration-thickness: 1px;
  transition:               text-decoration-color var(--transition-fast);
}
a:not([class]):hover {
  text-decoration-color: var(--color-accent);
}

/* --- 3. Component Classes --- */

/* --- Button --- */

.btn {
  display:          inline-flex;
  align-items:      center;
  gap:              var(--space-2);
  padding:          8px 16px;
  border-radius:    var(--radius-btn);     /* 4px — sharp, technical */
  font-size:        0.875rem;
  font-weight:      500;
  font-family:      ui-monospace, SFMono-Regular, Menlo, monospace;
  line-height:      1;
  letter-spacing:   0.02em;
  cursor:           pointer;
  white-space:      nowrap;
  transition:       background-color var(--transition-fast),
                    border-color     var(--transition-fast),
                    transform        var(--transition-fast);
  /* Flat fill with high-contrast border — technical depth signal (N14) */
  background-color: var(--color-accent);
  color:            #fff;
  border:           1px solid transparent;
  box-shadow:       none;
}

.btn:hover {
  background-color: color-mix(in srgb, var(--color-accent) 85%, #000);
  transform:        translateY(-1px);      /* lift on hover — N20 compliance */
}

.btn:active {
  transform:        translateY(0px);       /* press-down — N20 compliance */
  background-color: color-mix(in srgb, var(--color-accent) 75%, #000);
}

.btn:focus-visible {
  outline:        2px solid var(--color-accent);
  outline-offset: 2px;                     /* custom focus ring — N18 compliance */
}

/* Ghost — high-contrast border (craft profile: "high-contrast border on ghost") */
.btn-ghost {
  background-color: transparent;
  color:            var(--color-fg);
  border:           1px solid var(--color-border-strong);
  box-shadow:       none;
}

.btn-ghost:hover {
  background-color: var(--color-bg-raised);
  border-color:     var(--color-fg-muted);
  transform:        translateY(-1px);
}

.btn-ghost:active {
  transform:        translateY(0px);
  background-color: var(--color-bg-sunken);
}

/* --- Card --- */

.card {
  background:    var(--color-bg-raised);
  border-radius: var(--radius-card);       /* 8px — tight, dense */
  box-shadow:    var(--shadow-card);
  padding:       var(--space-4);
  transition:    box-shadow var(--transition-base),
                 transform  var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-card-hover);
  transform:  translateY(-1px);
}

/* --- Badge --- */

.badge {
  display:          inline-flex;
  align-items:      center;
  gap:              var(--space-1);
  padding:          2px 8px;
  border-radius:    var(--radius-pill);    /* pill — categorical difference */
  font-size:        0.6875rem;
  font-weight:      500;
  font-family:      ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing:   0.05em;
  text-transform:   uppercase;
  background-color: var(--color-accent-subtle);
  color:            var(--color-accent);
  border:           1px solid rgba(14, 165, 233, 0.20);
}

/* --- Input --- */

.input {
  display:          block;
  width:            100%;
  padding:          8px 12px;
  border-radius:    var(--radius-input);   /* 6px — distinct from card and btn */
  font-size:        0.875rem;
  font-family:      ui-monospace, SFMono-Regular, Menlo, monospace;
  background-color: var(--color-bg-sunken);
  color:            var(--color-fg);
  border:           1px solid var(--color-border-strong);
  transition:       border-color var(--transition-fast),
                    box-shadow   var(--transition-fast);
  -webkit-appearance: none;
  appearance:       none;
}

.input::placeholder { color: var(--color-fg-faint); }

.input:focus {
  outline:      none;
  border-color: var(--color-accent);
  box-shadow:   0 0 0 3px var(--color-accent-subtle); /* custom focus ring — N18 */
}

/* --- 4. Utility Classes --- */

/* Scroll-triggered reveal (honors prefers-reduced-motion) */
.reveal {
  opacity:    0;
  transform:  translateY(16px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal.visible {
  opacity:   1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal,
  .reveal.visible {
    opacity:    1;
    transform:  none;
    transition: none;
  }
}

/* Gradient text — technical cool-to-accent */
.gradient-text {
  background-image:    linear-gradient(135deg, var(--color-accent) 0%, #38bdf8 100%);
  -webkit-background-clip: text;
  background-clip:     text;
  -webkit-text-fill-color: transparent;
  color:               transparent;
}

/* Glass — dark, technical tint */
.glass {
  background:  rgba(22, 27, 34, 0.80);
  backdrop-filter:         blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border:      1px solid var(--color-border);
}

/* Divider — hairline 1px solid at 8% opacity (craft profile) */
.divider {
  height:     1px;
  border:     none;
  background: var(--color-border);        /* 8% opacity border = hairline */
  margin:     var(--space-8) 0;
}

/* Icon container — no tinted background (craft profile: monochrome, no container) */
.icon-container {
  display:          inline-flex;
  align-items:      center;
  justify-content:  center;
  width:            var(--icon-feature);
  height:           var(--icon-feature);
  color:            var(--color-fg-muted);
  flex-shrink:      0;
}