/* ── Reset & base ──────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #040714;
  --surface-1: rgba(255,255,255,.03);
  --surface-2: rgba(255,255,255,.06);
  --surface-toast: #1a1730;
  --border-subtle: rgba(255,255,255,.07);
  --border: rgba(255,255,255,.1);
  --border-strong: rgba(255,255,255,.22);
  --text-primary: #f9f9f9;
  --text-secondary: #cacaca;
  --text-muted: rgba(255,255,255,.55);
  --accent: #db2777;
  --accent-bright: #f472b6;
  --accent-soft: rgba(219, 39, 119, 0.15);
  --danger: #e11d48;
  --danger-hover: #f43f5e;
  --font: 'Avenir Next', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --text-xs: 0.75rem; --text-sm: 0.875rem; --text-base: 1rem;
  --text-lg: 1.125rem; --text-xl: 1.25rem; --text-2xl: 1.5rem;
  --space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 16px;
  --space-6: 24px; --space-8: 32px;
  --radius-sm: 6px; --radius: 10px; --radius-lg: 15px;
  --ease-snap: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast: 120ms; --dur: 200ms;
  --control-height: 44px;
  --control-height-sm: 36px;
  --shadow-card: 0 12px 28px rgba(15, 23, 42, 0.5);
  --shadow-modal: 0 24px 48px rgba(2, 6, 23, 0.58);
  --z-sticky-header: 200;
  --z-modal: 400;
  --z-toast: 500;
}

html { height: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  min-height: 100%;
  color: var(--text-primary);
  display: flex; flex-direction: column;
}

main#main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  width: 100%;
}

.container {
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-6);
  flex: 1;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.section {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.section__header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4);
}
.section__titles {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 0;
}
.section__title {
  font-size: var(--text-xl);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}
.section__lead {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.45;
  max-width: 52ch;
}

/* ── Header ────────────────────────────────────────────────── */
.header-bar {
  background: linear-gradient(in oklch 135deg, #B015B0 0%, #3D0080 50%, #040714 100%);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 var(--space-6);
  height: 68px;
  position: sticky;
  top: 0;
  z-index: var(--z-sticky-header);
  display: flex;
  align-items: center;
}

.header-logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

.header-logo-img {
  height: 36px; width: auto; flex-shrink: 0;
  filter: brightness(0) invert(1);
  transition: transform 0.3s var(--ease-snap);
  display: block;
}
.header-logo-img:hover { transform: scale(1.14) rotate(-9deg); }

.header-title-link { text-decoration: none; color: inherit; }
.header-logo h1 { font-size: 1.2em; font-weight: 600; color: var(--text-primary); letter-spacing: .5px; }
.header-subtitle { font-size: .82em; color: rgba(255,255,255,.72); font-weight: 500; margin-top: 3px; }

nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.header-home {
  display: flex; align-items: center; justify-content: center;
  margin-left: 5px;
  min-width: var(--control-height);
  min-height: var(--control-height);
  padding: var(--space-2);
  color: rgba(255,255,255,0.9); text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--dur), background var(--dur);
  flex-shrink: 0;
}
.header-home:hover { color: #fff; background: rgba(255,255,255,0.12); }
.header-home svg { width: 34px; height: 34px; display: block; }

.nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--control-height);
  padding: 0 var(--space-3);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: var(--radius-sm);
  background: transparent;
  color: rgba(255,255,255,0.92);
  cursor: pointer;
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: 600;
  transition: background-color var(--dur), color var(--dur), border-color var(--dur);
}
.nav-link:hover {
  background: rgba(255,255,255,0.1);
  color: #fff;
}
.nav-link.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-bright);
}

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--control-height);
  padding: 0 var(--space-4);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-primary);
  transition:
    background-color var(--dur),
    color var(--dur),
    border-color var(--dur),
    box-shadow var(--dur),
    transform var(--dur-fast);
  -webkit-tap-highlight-color: transparent;
}
.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}
.btn--sm {
  min-height: var(--control-height-sm);
  padding: 0 var(--space-3);
  font-size: var(--text-xs);
}
.btn--primary {
  background: var(--accent);
  color: #fff;
  border-color: transparent;
}
.btn--primary:hover { background: var(--accent-bright); }
.btn--secondary {
  background: var(--surface-2);
  color: var(--text-primary);
  border-color: var(--border-strong);
}
.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

/* ── Inputs ────────────────────────────────────────────────── */
.input, .input--sm {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-1);
  color: var(--text-primary);
  font-size: var(--text-sm);
  font-family: inherit;
  transition: border-color var(--dur), box-shadow var(--dur);
}
.input:focus, .input:focus-within {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}
.input--sm {
  padding: var(--space-2) var(--space-3);
  min-height: var(--control-height-sm);
  width: auto;
}
select.input {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23cacaca' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.field-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.field-row label,
.slider-row label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-weight: 500;
}

.grid-two {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

/* ── Sliders ───────────────────────────────────────────────── */
.sliders-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}
.slider-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-3);
}
.slider-row input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}
.slider-label {
  font-size: var(--text-xs);
  color: var(--text-muted);
  min-width: 72px;
  text-align: right;
}

/* ── Toggles ───────────────────────────────────────────────── */
.toggles-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  padding: var(--space-2) 0;
}
.check {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}
.check input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
  cursor: pointer;
}

/* ── Cards ─────────────────────────────────────────────────── */
.card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  backdrop-filter: blur(10px);
  transition: border-color var(--dur), box-shadow var(--dur);
}
.card:hover {
  border-color: var(--border-strong);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.45);
}
.card--flat:hover {
  box-shadow: none;
}
.card .field-row + .field-row,
.card .grid-two + .field-row,
.card .sliders-grid + .field-row,
.card .toggles-row + .field-row,
.card .field-row + .grid-two,
.card .field-row + .sliders-grid,
.card .field-row + .toggles-row {
  margin-top: var(--space-4);
}

.output-header {
  display: flex;
  gap: var(--space-4);
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  margin-bottom: var(--space-4);
}
.output-header h3 { font-size: var(--text-lg); font-weight: 600; }

.output-text {
  width: 100%;
  min-height: 160px;
  padding: var(--space-4);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(0,0,0,0.2);
  color: var(--text-primary);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: var(--text-sm);
  line-height: 1.6;
  resize: vertical;
}
.output-text:focus { outline: none; }

/* ── Mode panels ───────────────────────────────────────────── */
.mode-panel[hidden] {
  display: none !important;
}
.mode-panel {
  animation: fadeIn 0.3s ease-out;
}

/* ── Footer ────────────────────────────────────────────────── */
.info-footer {
  text-align: center;
  padding: var(--space-6) var(--space-6) 28px;
  color: var(--text-muted);
  font-size: .78em;
  line-height: 1.8;
  border-top: 1px solid var(--border-subtle);
  margin-top: var(--space-8);
}
.footer-link {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--dur);
}
.footer-link:hover,
.footer-link:focus-visible {
  color: var(--text-secondary);
  text-decoration: underline;
}

/* ── Skip link ─────────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 1000;
  padding: var(--space-2) var(--space-4);
  background: var(--accent-bright);
  color: #000;
  font-weight: 600;
  font-size: var(--text-sm);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  text-decoration: none;
  transition: top var(--dur);
}
.skip-link:focus { top: 0; }

/* ── Focus styles ──────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--accent-bright);
  outline-offset: 2px;
}

/* ── Animations ────────────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Reduced motion ────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 640px) {
  .header-bar { padding: 0 var(--space-4); }
  .container { padding: var(--space-4); }
  .grid-two,
  .sliders-grid { grid-template-columns: 1fr; }
  .output-header { flex-direction: column; align-items: flex-start; }
  .toggles-row { gap: var(--space-3); }
}