/*
 * duckylabs.tech — shared shell
 *
 * Every page links this stylesheet *before* its own <style>, then overrides
 * --accent and --panel-width there. It provides:
 *   - design tokens (colors, type, radii)
 *   - the fixed background layers (glow + dot grid + vignette) that always
 *     cover the whole viewport, no matter how short or long the page is
 *   - page chrome: .dl-topbar, .dl-panel, .dl-footer, .dl-badge
 *   - small opt-in helpers: .dl-heading, .dl-title, .dl-label, .dl-btn, .dl-field
 *
 * The moving glyph field is drawn by assets/bg.js on a transparent canvas
 * that sits between the dot grid and the vignette.
 */

:root {
  color-scheme: dark;

  --bg: #060606;
  --panel: rgba(12, 12, 12, 0.9);
  --panel-solid: #0e0e0e;
  --panel-soft: #171717;
  --line: #262626;
  --line-strong: #363636;
  --text: #f0efea;
  --muted: #a5a39f;
  --dim: #858380;
  --hi: #d9d8d2;
  --accent: #86efac;

  --mono: "SF Mono", ui-monospace, "JetBrains Mono", "Roboto Mono", "IBM Plex Mono", Menlo, Consolas, monospace;

  --radius-lg: 16px;
  --radius: 10px;
  --radius-sm: 6px;

  --panel-width: 880px;
  --page-pad: clamp(12px, 3vw, 28px);

  /* Background cell size. bg.js reads this so its glyphs sit on the CSS dots. */
  --dl-grid: 26px;
  --dl-ink: #d9d8d2;
}

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

html {
  min-height: 100%;
  background: var(--bg);
  scrollbar-width: thin;
  scrollbar-color: #3a3a3a transparent;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: #333;
  border: 2px solid var(--bg);
  border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
  background: #4a4a4a;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(10px, 2vw, 14px);
  padding: var(--page-pad);
  color: var(--text);
  font-family: var(--mono);
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-variant-numeric: tabular-nums lining-nums;
}

/* ---------- background layers ---------------------------------------------
 * All three are position: fixed + inset: 0, so they are always exactly the
 * viewport. Nothing is painted on <body> itself, which is what used to make
 * the old gradient stop at the bottom of the content box.
 */

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background:
    radial-gradient(60rem 34rem at 50% -7rem, color-mix(in srgb, var(--accent) 11%, transparent), transparent 72%),
    radial-gradient(circle at center, rgba(217, 216, 210, 0.11) 0.9px, transparent 1.7px) 0 0 / var(--dl-grid) var(--dl-grid);
}

.dl-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  display: block;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.dl-bg[hidden] {
  display: none;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 115% 85% at 50% 38%, transparent 52%, rgba(0, 0, 0, 0.62) 100%),
    linear-gradient(180deg, transparent 70%, rgba(0, 0, 0, 0.35) 100%);
}

/* ---------- global niceties --------------------------------------------- */

::selection {
  background: color-mix(in srgb, var(--accent) 34%, transparent);
  color: #fff;
}

:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--accent) 72%, transparent);
  outline-offset: 2px;
}

:where(a) {
  color: color-mix(in srgb, var(--accent) 78%, var(--text));
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

:where(kbd) {
  display: inline-block;
  min-width: 1.6em;
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0 0.35em;
  color: var(--muted);
  font: inherit;
  font-size: 0.88em;
  line-height: 1.45;
  text-align: center;
}

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

/* ---------- top bar: a shell-style path back to home ---------------------- */

.dl-topbar {
  width: min(100%, var(--panel-width));
  min-height: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px 14px;
  padding: 0 4px;
  color: var(--dim);
  font-size: clamp(0.74rem, 1.9vw, 0.82rem);
}

.dl-path {
  display: flex;
  align-items: center;
  min-width: 0;
  white-space: nowrap;
}

.dl-path a {
  color: var(--muted);
  text-decoration: none;
  transition: color 150ms ease;
}

.dl-path a:hover,
.dl-path a:focus-visible {
  color: var(--text);
}

.dl-prompt {
  margin-right: 0.65ch;
  color: var(--accent);
  font-weight: 600;
}

.dl-sep {
  padding: 0 0.1ch;
  color: var(--dim);
}

.dl-here {
  min-width: 0;
  overflow: hidden;
  color: var(--text);
  text-overflow: ellipsis;
}

.dl-caret {
  flex: none;
  width: 0.58em;
  height: 1.08em;
  margin-left: 0.45ch;
  background: var(--accent);
  opacity: 0.85;
  animation: dl-blink 1.1s step-end infinite;
}

@keyframes dl-blink {
  50% {
    opacity: 0;
  }
}

.dl-topbar-links {
  display: flex;
  flex: none;
  align-items: center;
  gap: clamp(10px, 2.4vw, 18px);
}

.dl-topbar-links a {
  color: var(--dim);
  text-decoration: none;
  transition: color 150ms ease;
}

.dl-topbar-links a:hover,
.dl-topbar-links a:focus-visible {
  color: var(--text);
}

/* ---------- panel: the main content window --------------------------------- */

.dl-panel {
  position: relative;
  width: min(100%, var(--panel-width));
  display: grid;
  gap: var(--panel-gap, clamp(20px, 3.5vw, 32px));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0) 16rem),
    var(--panel);
  box-shadow:
    0 0 0 1px rgba(0, 0, 0, 0.45),
    0 30px 90px rgba(0, 0, 0, 0.6);
  padding: clamp(18px, 4vw, 40px);
}

/* HUD-style accent brackets on two corners. They share the panel's radius,
   so the arcs sit exactly on top of the border. */
.dl-panel::before,
.dl-panel::after {
  content: "";
  position: absolute;
  width: 46px;
  height: 46px;
  border: 1px solid color-mix(in srgb, var(--accent) 80%, transparent);
  pointer-events: none;
}

.dl-panel::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
  border-top-left-radius: var(--radius-lg);
  -webkit-mask-image: linear-gradient(135deg, #000 35%, transparent 72%);
  mask-image: linear-gradient(135deg, #000 35%, transparent 72%);
}

.dl-panel::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
  border-bottom-right-radius: var(--radius-lg);
  -webkit-mask-image: linear-gradient(315deg, #000 35%, transparent 72%);
  mask-image: linear-gradient(315deg, #000 35%, transparent 72%);
}

/* ---------- footer --------------------------------------------------------- */

.dl-footer {
  width: min(100%, var(--panel-width));
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 18px;
  padding: 4px 4px 0;
  color: var(--dim);
  font-size: clamp(0.66rem, 1.6vw, 0.74rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.dl-footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 18px;
}

.dl-footer a,
.dl-bg-toggle {
  color: var(--dim);
  text-decoration: none;
  transition: color 150ms ease;
}

.dl-footer a:hover,
.dl-footer a:focus-visible,
.dl-bg-toggle:hover,
.dl-bg-toggle:focus-visible {
  color: var(--text);
}

.dl-bg-toggle {
  appearance: none;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  font: inherit;
  letter-spacing: inherit;
  text-transform: inherit;
  cursor: pointer;
}

.dl-bg-toggle[aria-pressed="true"]::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px color-mix(in srgb, var(--accent) 70%, transparent);
  vertical-align: 0.1em;
}

/* ---------- badges (beta / legacy) ---------------------------------------- */

.dl-badge {
  --tone: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex: none;
  border: 1px solid color-mix(in srgb, var(--tone) 42%, var(--line));
  border-radius: 999px;
  background: color-mix(in srgb, var(--tone) 8%, transparent);
  padding: 2px 9px;
  color: color-mix(in srgb, var(--tone) 82%, var(--text));
  font-size: 0.66rem;
  line-height: 1.5;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
}

.dl-badge::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
}

.dl-badge--beta {
  --tone: #e8b45a;
}

.dl-badge--legacy {
  --tone: #9a9893;
}

/* ---------- opt-in helpers for page content ------------------------------- */

.dl-heading {
  display: grid;
  gap: 8px;
}

.dl-title {
  margin: 0;
  font-size: clamp(1.45rem, 4.5vw, 2.3rem);
  font-weight: 650;
  line-height: 1.08;
  letter-spacing: -0.045em;
}

.dl-title-mark {
  margin-right: 0.3em;
  color: var(--accent);
  font-weight: 500;
}

.dl-subtitle {
  margin: 0;
  color: var(--muted);
  font-size: clamp(0.72rem, 1.8vw, 0.86rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.dl-label {
  color: var(--muted);
  font-size: clamp(0.66rem, 1.6vw, 0.76rem);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.dl-btn {
  appearance: none;
  margin: 0;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--panel-soft);
  padding: 10px 16px;
  color: var(--text);
  font: inherit;
  font-size: clamp(0.78rem, 1.8vw, 0.88rem);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color 150ms ease, background-color 150ms ease, box-shadow 200ms ease;
}

.dl-btn:hover {
  border-color: var(--hi);
  background: #1d1d1d;
}

.dl-btn--primary {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
  background: color-mix(in srgb, var(--accent) 8%, var(--panel-soft));
}

.dl-btn--primary:hover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, var(--panel-soft));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 14%, transparent);
}

.dl-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.dl-field {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel-soft);
  padding: 8px 10px;
  color: var(--text);
  font: inherit;
  font-size: clamp(0.84rem, 2vw, 0.95rem);
  outline: none;
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

.dl-field:focus,
.dl-field:focus-visible {
  border-color: color-mix(in srgb, var(--accent) 70%, var(--line));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 14%, transparent);
}

.dl-field::placeholder {
  color: var(--dim);
}

/* ---------- small screens / motion ---------------------------------------- */

@media (max-width: 640px) {
  :root {
    --dl-grid: 24px;
  }

  .dl-panel {
    padding: 22px 16px;
  }

  .dl-panel::before,
  .dl-panel::after {
    width: 34px;
    height: 34px;
  }
}

@media (max-width: 420px) {
  .dl-topbar {
    gap: 8px;
  }

  .dl-prompt {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .dl-caret {
    animation: none;
  }
}