/* generateascii.com — design system
   Dark-terminal aesthetic, system monospace stack (zero external font requests). */

:root {
  --bg: #0b0d0f;
  --bg-raised: #121519;
  --bg-inset: #08090a;
  --border: #23282e;
  --border-soft: #1a1e23;
  --text: #e6e8eb;
  --text-dim: #9aa4af;
  --text-faint: #5b6570;
  --accent: #39ff88;
  --accent-dim: #1f9c53;
  --accent-contrast: #04170b;
  --danger: #ff5f56;
  --focus: #7cc6ff;
  --radius: 6px;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "Menlo", "Consolas",
    "Liberation Mono", monospace;
  --maxw: 1180px;
}

:root[data-theme="light"] {
  --bg: #f5f6f4;
  --bg-raised: #ffffff;
  --bg-inset: #edeeec;
  --border: #d8dbd6;
  --border-soft: #e6e8e4;
  --text: #14181a;
  --text-dim: #4b5560;
  --text-faint: #8a939c;
  --accent: #0f8a45;
  --accent-dim: #0c6e37;
  --accent-contrast: #f2fff6;
  --focus: #0a6cbf;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f5f6f4;
    --bg-raised: #ffffff;
    --bg-inset: #edeeec;
    --border: #d8dbd6;
    --border-soft: #e6e8e4;
    --text: #14181a;
    --text-dim: #4b5560;
    --text-faint: #8a939c;
    --accent: #0f8a45;
    --accent-dim: #0c6e37;
    --accent-contrast: #f2fff6;
    --focus: #0a6cbf;
  }
}

* { box-sizing: border-box; }
html { color-scheme: dark light; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 8px 12px;
  z-index: 100;
}
.skip-link:focus { left: 8px; top: 8px; }

button, select, input, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: var(--bg-inset);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius);
  padding: 8px 12px;
  transition: border-color .12s ease, background .12s ease, color .12s ease;
}
button:hover { border-color: var(--accent-dim); color: var(--accent); }
button:focus-visible, a:focus-visible, select:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}
button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
  font-weight: 600;
}
button.primary:hover { color: var(--accent-contrast); filter: brightness(1.08); }
button:disabled { opacity: .45; cursor: not-allowed; }
button.icon-btn { padding: 6px 10px; font-size: 13px; }

select, input[type="text"], input[type="number"], textarea {
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 7px 10px;
  width: 100%;
}
textarea { resize: vertical; }

input[type="range"] { width: 100%; accent-color: var(--accent); }
input[type="color"] {
  width: 40px; height: 30px; padding: 2px;
  background: var(--bg-inset); border: 1px solid var(--border); border-radius: var(--radius);
}

label { display: block; font-size: 12.5px; color: var(--text-dim); margin-bottom: 4px; }
.field { margin-bottom: 14px; }
.field-row { display: flex; gap: 10px; align-items: center; }
.field-row label { margin-bottom: 0; }

/* ---------- layout shell ---------- */
.site-header {
  border-bottom: 1px solid var(--border-soft);
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(8px);
  z-index: 20;
}
.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: flex; align-items: baseline; gap: 10px; }
.brand-mark {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.02em;
}
.brand-mark .bracket { color: var(--accent); }
.brand-tag { color: var(--text-faint); font-size: 12px; display: none; }
@media (min-width: 640px) { .brand-tag { display: inline; } }

.header-actions { display: flex; align-items: center; gap: 8px; }

main { max-width: var(--maxw); margin: 0 auto; padding: 24px 20px 60px; }

.container-narrow { max-width: 760px; margin: 0 auto; padding: 40px 20px 60px; }
.container-narrow h1 { font-size: 22px; }
.container-narrow h2 { font-size: 16px; margin-top: 32px; }
.container-narrow p, .container-narrow li { color: var(--text-dim); }

/* ---------- hero ---------- */
.hero { text-align: center; padding: 20px 0 28px; }
.hero h1 {
  font-size: clamp(22px, 4vw, 34px);
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.hero p { color: var(--text-dim); margin: 0; font-size: 14.5px; }
.hero .trust-line {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--text-faint);
}
.hero .trust-line .dot { color: var(--accent); margin: 0 6px; }

/* ---------- tabs ---------- */
.tabbar {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--border-soft);
  margin-bottom: 20px;
}
.tab-btn {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  padding: 10px 4px;
  margin-right: 22px;
  color: var(--text-dim);
  font-size: 14.5px;
  font-weight: 600;
}
.tab-btn:hover { color: var(--text); border-color: var(--border); }
.tab-btn[aria-selected="true"] { color: var(--accent); border-color: var(--accent); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---------- tool layout ---------- */
.tool-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
@media (min-width: 900px) {
  .tool-grid { grid-template-columns: 300px 1fr; align-items: start; }
}

.panel {
  background: var(--bg-raised);
  border: 1px solid var(--border-soft);
  border-radius: 10px;
  padding: 16px;
}
.panel h2 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-faint);
  margin: 0 0 14px;
}
.panel + .panel { margin-top: 16px; }

.controls-stack { display: flex; flex-direction: column; }

fieldset { border: none; padding: 0; margin: 0 0 14px; }
fieldset legend { padding: 0; }

.btn-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 6px; }

/* ---------- preview / output ---------- */
.output-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}
.output-toolbar .btn-row { margin-top: 0; }

.ascii-surface {
  background: var(--bg-inset);
  border: 1px solid var(--border-soft);
  border-radius: 10px;
  overflow: auto;
  min-height: 220px;
  position: relative;
}
.ascii-surface pre {
  margin: 0;
  padding: 20px;
  white-space: pre;
  line-height: 1.05;
  font-size: 13px;
  tab-size: 1;
}
.ascii-surface canvas { display: block; max-width: 100%; }
.ascii-surface.is-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-faint);
  font-size: 13px;
  min-height: 260px;
  text-align: center;
  padding: 20px;
}

.copy-flash {
  position: absolute;
  top: 10px; right: 10px;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 4px 10px;
  border-radius: 5px;
  font-size: 12px;
  font-weight: 600;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity .15s ease, transform .15s ease;
  pointer-events: none;
}
.copy-flash.show { opacity: 1; transform: translateY(0); }

/* ---------- font gallery ---------- */
.gallery-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}
.gallery-head h2 { margin: 0; }
.gallery {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  max-height: 480px;
  overflow-y: auto;
  padding-right: 4px;
}
.gallery-item {
  text-align: left;
  background: var(--bg-inset);
  border: 1px solid var(--border-soft);
  padding: 10px 12px;
  border-radius: 8px;
  overflow: hidden;
}
.gallery-item:hover { border-color: var(--accent-dim); }
.gallery-item[aria-pressed="true"] { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, var(--bg-inset)); }
.gallery-item .font-name {
  display: block;
  font-size: 11px;
  color: var(--text-faint);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.gallery-item pre {
  margin: 0;
  font-size: 11px;
  line-height: 1.05;
  color: var(--text);
  white-space: pre;
  overflow-x: auto;
}

/* ---------- dropzone (image mode) ---------- */
.dropzone {
  border: 1.5px dashed var(--border);
  border-radius: 10px;
  padding: 28px 16px;
  text-align: center;
  color: var(--text-dim);
  cursor: pointer;
  background: var(--bg-inset);
  transition: border-color .12s ease, background .12s ease;
}
.dropzone:hover, .dropzone.dragover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 6%, var(--bg-inset));
}
.dropzone strong { color: var(--text); }
.dropzone .hint { font-size: 12px; color: var(--text-faint); margin-top: 4px; }
.source-thumb {
  margin-top: 12px;
  display: none;
  align-items: center;
  gap: 10px;
  background: var(--bg-inset);
  border: 1px solid var(--border-soft);
  border-radius: 8px;
  padding: 8px;
}
.source-thumb.show { display: flex; }
.source-thumb img { width: 44px; height: 44px; object-fit: cover; border-radius: 4px; }
.source-thumb .meta { font-size: 12px; color: var(--text-dim); overflow: hidden; text-overflow: ellipsis; }

/* ---------- range value display ---------- */
.range-label { display: flex; justify-content: space-between; font-size: 12.5px; color: var(--text-dim); margin-bottom: 4px; }
.range-label span:last-child { color: var(--text); font-variant-numeric: tabular-nums; }

/* swatch segmented control */
.segmented { display: flex; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.segmented button {
  flex: 1; border: none; border-radius: 0; background: var(--bg-inset);
  border-right: 1px solid var(--border);
}
.segmented button:last-child { border-right: none; }
.segmented button[aria-pressed="true"] { background: var(--accent); color: var(--accent-contrast); font-weight: 600; }

/* ---------- ad slots ---------- */
.ad-slot {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-raised);
  border: 1px dashed var(--border);
  border-radius: 10px;
  color: var(--text-faint);
  font-size: 11px;
  letter-spacing: .05em;
  text-transform: uppercase;
  margin: 28px auto;
  max-width: var(--maxw);
  overflow: hidden;
}
.ad-slot::before { content: "Advertisement"; }
.ad-slot--leaderboard { min-height: 90px; }
.ad-slot--inline { min-height: 100px; margin: 24px 0; }
.ad-slot--footer { min-height: 90px; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--border-soft);
  margin-top: 40px;
}
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 24px 20px 40px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  color: var(--text-faint);
  font-size: 12.5px;
}
.footer-links { display: flex; gap: 16px; flex-wrap: wrap; }
.footer-links a { color: var(--text-dim); }

/* ---------- misc ---------- */
.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;
}

.spinner {
  display: inline-block; width: 12px; height: 12px;
  border: 2px solid var(--border); border-top-color: var(--accent);
  border-radius: 50%; animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

::selection { background: var(--accent); color: var(--accent-contrast); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-inset); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-faint); }