/* ---------------------------------------------------------------
   Palette — gunmetal with a powdery range of soft steel tints.
   --------------------------------------------------------------- */

:root {
  --bg:            #eef1f5;
  --bg-raised:     #ffffff;
  --panel-bg:      #ffffff;
  --panel-border:  #cfd6de;
  --panel-shadow:  0 1px 2px rgba(42, 52, 64, 0.05),
                   0 6px 22px rgba(42, 52, 64, 0.08);
  --fieldset-bg:   #f5f7fa;
  --fieldset-border: #dce2e8;

  --text:          #2a3440;
  --text-muted:    #5c6b79;
  --text-subtle:   #8591a0;

  --accent:        #556b7b;
  --accent-hover:  #3f5565;
  --accent-contrast:#ffffff;
  --accent-soft:   #dbe3eb;

  --debian:        #a04a5a;
  --ubuntu:        #c96a3e;

  --code-bg:       #242c36;
  --code-fg:       #dde3eb;
  --code-muted:    #8591a0;

  --error:         #b0465a;
  --error-bg:      #f4dde2;

  --focus-ring:    0 0 0 3px rgba(85, 107, 123, 0.32);

  --radius:        10px;
  --radius-sm:     6px;
  --gap:           1rem;
}

:root[data-theme="dark"] {
  --bg:            #1b212a;
  --bg-raised:     #252d38;
  --panel-bg:      #242c37;
  --panel-border:  #3a4450;
  --panel-shadow:  0 1px 2px rgba(0, 0, 0, 0.4),
                   0 8px 28px rgba(0, 0, 0, 0.4);
  --fieldset-bg:   #1f2630;
  --fieldset-border: #2f3844;

  --text:          #dde4ec;
  --text-muted:    #9ba7b5;
  --text-subtle:   #6d7886;

  --accent:        #89a4b6;
  --accent-hover:  #a2bac9;
  --accent-contrast:#1a2028;
  --accent-soft:   #2c3946;

  --debian:        #d07f8c;
  --ubuntu:        #e08b61;

  --code-bg:       #131922;
  --code-fg:       #dde3eb;
  --code-muted:    #7e8a98;

  --error:         #e98fa1;
  --error-bg:      #3a222a;

  --focus-ring:    0 0 0 3px rgba(137, 164, 182, 0.4);
}

/* Fall back to prefers-color-scheme only when the user hasn't chosen. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg:            #1b212a;
    --bg-raised:     #252d38;
    --panel-bg:      #242c37;
    --panel-border:  #3a4450;
    --panel-shadow:  0 1px 2px rgba(0, 0, 0, 0.4),
                     0 8px 28px rgba(0, 0, 0, 0.4);
    --fieldset-bg:   #1f2630;
    --fieldset-border: #2f3844;

    --text:          #dde4ec;
    --text-muted:    #9ba7b5;
    --text-subtle:   #6d7886;

    --accent:        #89a4b6;
    --accent-hover:  #a2bac9;
    --accent-contrast:#1a2028;
    --accent-soft:   #2c3946;

    --debian:        #d07f8c;
    --ubuntu:        #e08b61;

    --code-bg:       #131922;
    --code-fg:       #dde3eb;
    --code-muted:    #7e8a98;

    --error:         #e98fa1;
    --error-bg:      #3a222a;

    --focus-ring:    0 0 0 3px rgba(137, 164, 182, 0.4);
  }
}

/* Distro tinting. */
body[data-distro="debian"] { --accent-distro: var(--debian); }
body[data-distro="ubuntu"] { --accent-distro: var(--ubuntu); }

/* ---------------------------------------------------------------
   Base
   --------------------------------------------------------------- */

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

html, body {
  margin: 0;
  padding: 0;
}

body {
  background:
    radial-gradient(1200px 600px at 15% -10%, var(--accent-soft), transparent 60%),
    var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  min-height: 100vh;
}

a { color: var(--accent); }
a:hover { color: var(--accent-hover); }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
  background: var(--accent-soft);
  color: var(--text);
  padding: 0.08em 0.38em;
  border-radius: 4px;
}

pre {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 1rem;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88rem;
  line-height: 1.55;
  margin: 0;
}

pre.empty {
  color: var(--code-muted);
  font-style: italic;
  background: color-mix(in srgb, var(--code-bg) 85%, transparent);
}

/* ---------------------------------------------------------------
   Header
   --------------------------------------------------------------- */

.site-header {
  padding: 2rem 1.5rem 1.25rem;
  max-width: 1280px;
  margin: 0 auto;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  min-width: 0;
}

.app-logo {
  color: var(--accent);
  flex-shrink: 0;
  filter: drop-shadow(0 1px 2px rgba(42, 52, 64, 0.18));
}

:root[data-theme="dark"] .app-logo {
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.45));
}

.site-header h1 {
  margin: 0;
  font-size: 1.85rem;
  letter-spacing: -0.01em;
}

.tagline {
  color: var(--text-muted);
  margin: 0;
  max-width: none;
}

/* Theme toggle */

.theme-toggle {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--panel-border);
  background: var(--bg-raised);
  color: var(--text);
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  box-shadow: var(--panel-shadow);
  transition: transform 0.1s ease, background 0.2s ease, color 0.2s ease;
}

.theme-toggle:hover { background: var(--accent-soft); }
.theme-toggle:active { transform: translateY(1px); }
.theme-toggle:focus-visible { outline: none; box-shadow: var(--focus-ring); }

.theme-toggle-icon {
  display: inline-block;
  width: 1em;
  text-align: center;
  transition: transform 0.25s ease;
}

:root[data-theme="dark"] .theme-toggle-icon { transform: rotate(180deg); }

/* ---------------------------------------------------------------
   Site navigation (horizontal navbar shared across all pages)
   --------------------------------------------------------------- */

.site-nav {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.25rem 1.5rem 0;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0 0 0.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  border-bottom: 1px solid var(--panel-border);
}

.site-nav a {
  display: inline-block;
  padding: 0.45rem 0.9rem;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.95rem;
  transition: background 0.15s ease, color 0.15s ease;
}

.site-nav a:hover {
  background: var(--accent-soft);
  color: var(--text);
}

.site-nav a[aria-current="page"] {
  color: var(--accent);
  background: var(--accent-soft);
  font-weight: 600;
}

.site-nav a:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* ---------------------------------------------------------------
   Shared page-level helpers (FAQ, repo cards, warning banners)
   --------------------------------------------------------------- */

.page-intro {
  color: var(--text-muted);
  margin: 0 0 1rem;
}

.warning-banner {
  border: 1px solid color-mix(in srgb, var(--debian) 45%, transparent);
  background: color-mix(in srgb, var(--debian) 12%, var(--panel-bg));
  color: var(--text);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  margin: 0 0 1.25rem;
  font-size: 0.92rem;
}

.warning-banner strong { color: var(--debian); }

/* <details>/<summary> FAQ accordion. */
.faq > details {
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  padding: 0;
  margin: 0 0 0.6rem;
  background: var(--fieldset-bg);
  overflow: hidden;
}

.faq > details[open] {
  background: var(--panel-bg);
  box-shadow: var(--panel-shadow);
}

.faq > details > summary {
  cursor: pointer;
  padding: 0.85rem 1rem;
  font-weight: 600;
  color: var(--text);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.faq > details > summary::-webkit-details-marker { display: none; }
.faq > details > summary::after {
  content: "+";
  font-weight: 400;
  font-size: 1.25rem;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}

.faq > details[open] > summary::after {
  content: "\2013";
  transform: none;
}

.faq > details > :not(summary) {
  padding: 0 1rem 1rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.faq > details > :not(summary):first-of-type { padding-top: 0.25rem; }

/* Repo card (used on /third-party/ and /variants/). */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.9rem;
}

.repo-card {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  background: var(--fieldset-bg);
  transition: border-color 0.15s ease, background 0.15s ease;
}

.repo-card:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.repo-card header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
}

.repo-card h3 {
  margin: 0;
  font-size: 1rem;
}

.repo-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

.repo-card .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
  font-size: 0.8rem;
  color: var(--text-subtle);
  margin-top: 0.15rem;
}

.repo-card .meta code { font-size: 0.78rem; }

.repo-card label.check {
  margin-top: 0.25rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.category-heading {
  margin: 1.25rem 0 0.5rem;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.category-heading:first-of-type { margin-top: 0; }

.search-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1rem;
}

.search-row input[type="search"] {
  flex: 1;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  background: var(--bg-raised);
  color: var(--text);
  font: inherit;
}

.search-row input[type="search"]:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--focus-ring);
}

.empty-hits {
  color: var(--text-subtle);
  font-style: italic;
  margin: 1rem 0;
}

/* Simpler horizontal form row used by secondary pages (third-party, variants).
   Wraps on narrow viewports; .field-grow expands to fill remaining space. */
.options-row-simple {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.25rem;
  align-items: flex-end;
  margin: 0 0 1rem;
}

.options-row-simple .field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-width: 180px;
  flex: 0 0 auto;
}

.options-row-simple .field-grow { flex: 1 1 260px; min-width: 220px; }

.options-row-simple .field > label,
.options-row-simple .field .field-label {
  font-weight: 600;
  font-size: 0.88rem;
}

.options-row-simple .search-row { margin: 0; }

/* Action row: Reset + Generate aligned bottom-right like the main form. */
.actions-row {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 0.6rem;
  margin: 1rem 0 0;
}

.actions-row .primary { padding: 0.65rem 1.9rem; font-weight: 600; }

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

main.app-stack {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Options grid: 3 progressive rows that collapse on narrow viewports.
   Row A (dropdowns):  Distribution | Release | Format | Mirror | Architecture
   Row B (checklists): Components (×3) | Suites (×2)
   Row C (action): Generate (right) */
.options-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1.25rem 1.5rem;
  align-items: start;
}

.options-grid .field {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  min-width: 0;
}

.options-grid .field > label,
.options-grid .field .field-label {
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--text);
  letter-spacing: 0.01em;
}

.options-grid .field-components { grid-column: 1 / span 3; }
.options-grid .field-suites     { grid-column: 4 / span 2; }

.options-grid .field-action {
  grid-column: 1 / -1;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 0.6rem;
  padding-top: 0.25rem;
}

.options-grid .field-action .primary {
  padding: 0.65rem 1.9rem;
  font-weight: 600;
  white-space: nowrap;
}

/* Responsive: 2 columns at medium widths, 1 at narrow. */
@media (max-width: 900px) {
  .options-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .options-grid .field-components,
  .options-grid .field-suites {
    grid-column: auto;
  }
}

@media (max-width: 560px) {
  .options-grid {
    grid-template-columns: minmax(0, 1fr);
  }
  .options-grid .field-components,
  .options-grid .field-suites,
  .options-grid .field-action {
    grid-column: auto;
  }
}

/* Vertical checkbox stack (Components + Suites). */
.check-stack {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-height: 2rem;
}

.check-empty {
  color: var(--text-subtle);
  font-style: italic;
  font-size: 0.88rem;
  margin: 0.15rem 0 0;
}

/* Suite codename chip: hidden when a release hasn't been chosen. */
.suite-code {
  font-size: 0.82em;
  padding: 0.05em 0.4em;
  margin-left: 0.25em;
}

.suite-code:empty { display: none; }

/* Tone down disabled inputs so it's obvious they're waiting on a prior choice. */
select:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

label.check input:disabled ~ span {
  opacity: 0.55;
  cursor: not-allowed;
}

label.check:has(input:disabled) {
  cursor: not-allowed;
}

/* ---------------------------------------------------------------
   Panels & form
   --------------------------------------------------------------- */

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--panel-shadow);
}


label {
  display: block;
  margin: 0.25rem 0;
  color: var(--text);
}

label.radio,
label.check {
  display: flex;
  gap: 0.55rem;
  align-items: flex-start;
  cursor: pointer;
  padding: 0.15rem 0;
}

label.radio input,
label.check input {
  margin-top: 0.3rem;
  flex-shrink: 0;
  accent-color: var(--accent);
}

select,
input[type="url"],
input[type="text"] {
  width: 100%;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  background: var(--bg-raised);
  color: var(--text);
  font: inherit;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

select:hover,
input[type="url"]:hover,
input[type="text"]:hover {
  border-color: var(--accent);
}

select:focus-visible,
input[type="url"]:focus-visible,
input[type="text"]:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--focus-ring);
}

.hint {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin: 0.35rem 0 0.6rem;
}

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

.actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

button {
  font: inherit;
  padding: 0.6rem 1.15rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--panel-border);
  cursor: pointer;
  background: var(--bg-raised);
  color: var(--text);
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease, transform 0.08s ease;
}

button:hover { border-color: var(--accent); }
button:active { transform: translateY(1px); }

button:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-color: var(--accent);
}

button.primary {
  background: var(--accent);
  color: var(--accent-contrast);
  border-color: var(--accent);
  font-weight: 600;
}

button.primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

button.primary:disabled,
button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

button.secondary { color: var(--text-muted); }

/* ---------------------------------------------------------------
   Output panel
   --------------------------------------------------------------- */

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin: -0.25rem 0 0.85rem;
}

.output-header h2 {
  margin: 0;
  font-size: 1.1rem;
  letter-spacing: -0.005em;
}

.output-header h2 #output-filename {
  color: var(--accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.95rem;
}

.output-panel h3 {
  margin: 1.25rem 0 0.5rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ---------------------------------------------------------------
   Feedback
   --------------------------------------------------------------- */

.error {
  color: var(--error);
  background: var(--error-bg);
  border: 1px solid color-mix(in srgb, var(--error) 45%, transparent);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.75rem;
  margin: 0.75rem 0 0;
  font-weight: 500;
}

/* ---------------------------------------------------------------
   Footer
   --------------------------------------------------------------- */

footer {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1rem 1.5rem 2.5rem;
  color: var(--text-subtle);
  font-size: 0.85rem;
}

footer a { color: inherit; text-decoration: underline; text-decoration-color: var(--panel-border); }
footer a:hover { text-decoration-color: var(--accent); }