@import url('https://fonts.googleapis.com/css2?family=DM+Mono:ital,wght@0,300;0,400;0,500;1,300&family=Instrument+Serif:ital@0;1&display=swap');

:root {
  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.75);
  --glass-inner: rgba(255, 255, 255, 0.35);
  --glass-shadow: 0 8px 64px rgba(0,0,0,0.18), 0 2px 16px rgba(0,0,0,0.10);
  --inset-shadow: inset 0 1px 0 rgba(255,255,255,0.9);
  --text: #000000;
  --muted: #000000;
  --subtle: #252525;
  --accent: #1a1a1a;
  --divider: rgba(0,0,0,0.08);
  --hover-bg: rgba(0,0,0,0.04);
  --active-bg: rgba(0,0,0,0.07);
  --toggle-active-bg: rgba(0,0,0,0.06);
  --toggle-active-border: rgba(0,0,0,0.3);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
}

body {
  font-family: 'DM Mono', monospace;
  background:
    url('https://scenery.u888v99.workers.dev/') center center / cover no-repeat fixed;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

/* Subtle backdrop vignette */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 40%, rgba(0,0,0,0.25) 100%);
  pointer-events: none;
  z-index: 0;
}

/* ── Glass card ── */
.card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 520px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  box-shadow: var(--glass-shadow), var(--inset-shadow);
  backdrop-filter: blur(24px) saturate(1.6);
  -webkit-backdrop-filter: blur (24px) saturate(1.6);
  padding: 40px 36px 36px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

/* Glossy top sheen */
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 50%;
  border-radius: 20px 20px 0 0;
  background: linear-gradient(to bottom, rgba(255,255,255,0.45), transparent);
  pointer-events: none;
}

/* ── Header ── */
header {
  text-align: center;
}

.logo {
  font-family: 'Instrument Serif', serif;
  font-style: italic;
  font-size: 2rem;
  letter-spacing: -0.01em;
  color: var(--text);
  line-height: 1;
}

.logo span {
  font-style: normal;
}

.tagline {
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 6px;
  font-weight: 300;
}

/* ── Output ── */
.output-wrapper {
  background: var(--glass-inner);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 20px 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.8), inset 0 -1px 0 rgba(0,0,0,0.04);
}

.output-label {
  font-size: 0.55rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--subtle);
  font-weight: 400;
}

.output-text {
  font-family: 'DM Mono', monospace;
  font-size: 0.875rem;
  font-weight: 400;
  line-height: 1.75;
  color: var(--text);
  word-break: break-all;
  min-height: 2.8em;
  letter-spacing: 0.03em;
}

.output-text.empty {
  color: var(--subtle);
  font-style: italic;
  font-weight: 300;
}

@keyframes revealText {
  from { opacity: 0; transform: translateY(3px); }
  to   { opacity: 1; transform: translateY(0); }
}

.output-text.flash {
  animation: revealText 0.2s ease forwards;
}

.output-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 10px;
  border-top: 1px solid var(--divider);
}

.char-count {
  font-size: 0.6rem;
  color: var(--subtle);
  letter-spacing: 0.1em;
}

.char-count strong {
  color: var(--muted);
  font-weight: 500;
}

.copy-btn {
  background: transparent;
  border: 1px solid var(--divider);
  color: var(--muted);
  font-family: 'DM Mono', monospace;
  font-size: 0.55rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 5px 12px;
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.18s;
}

.copy-btn:hover {
  background: var(--hover-bg);
  border-color: rgba(0,0,0,0.2);
  color: var(--text);
}

.copy-btn.copied {
  background: rgba(0,0,0,0.06);
  border-color: rgba(0,0,0,0.25);
  color: var(--text);
}

.custom-chars {
  margin-top: 10px;
  width: 100%;
  background: rgba(255,255,255,0.35);
  border: 1px solid var(--divider);
  border-radius: 8px;
  padding: 8px 12px;
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  color: var(--text);
  outline: none;
  transition: border-color 0.18s, background 0.18s;
}

.custom-chars::placeholder {
  color: var(--subtle);
  font-style: italic;
  font-weight: 300;
}

.custom-chars:focus {
  border-color: rgba(0,0,0,0.25);
  background: rgba(255,255,255,0.55);
}

.copy-wrap {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 3px;
}

.copy-hint {
  font-size: 0.48rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--subtle);
  align-self: flex-end;
  margin-right: 2px;
}

.section-label {
  font-size: 0.55rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--subtle);
  margin-bottom: 10px;
}

.charset-grid {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.toggle {
  position: relative;
}

.toggle input {
  position: absolute;
  opacity: 0;
  width: 0; height: 0;
}

.toggle label {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 14px;
  border: 1px solid var(--divider);
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  background: rgba(255,255,255,0.3);
  transition: all 0.18s;
  user-select: none;
}

.toggle label:hover {
  background: rgba(255,255,255,0.55);
  border-color: rgba(0,0,0,0.15);
  color: var(--text);
}

.toggle input:checked + label {
  background: rgba(255,255,255,0.6);
  border-color: var(--toggle-active-border);
  color: var(--text);
  box-shadow: 0 1px 4px rgba(0,0,0,0.08), inset 0 1px 0 rgba(255,255,255,0.9);
}

.slider-section { }

.slider-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 4px;
}

.slider-wrapper {
  flex: 1;
}

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 2px;
  background: transparent;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 2px;
  background: linear-gradient(
    to right,
    rgba(0,0,0,0.5) var(--pct, 25%),
    rgba(0,0,0,0.12) var(--pct, 25%)
  );
  border-radius: 2px;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #fff;
  border: 1.5px solid rgba(0,0,0,0.25);
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
  margin-top: -6px;
  cursor: pointer;
  transition: box-shadow 0.15s, transform 0.15s;
}

input[type="range"]:hover::-webkit-slider-thumb {
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
  transform: scale(1.1);
}

.length-readout {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  min-width: 36px;
}

.length-num {
  font-family: 'Instrument Serif', serif;
  font-size: 1.4rem;
  color: var(--text);
  line-height: 1;
  width: 48px;
  text-align: right;
  background: transparent;
  border: none;
  outline: none;
  -moz-appearance: textfield;
}

.length-num::-webkit-inner-spin-button,
.length-num::-webkit-outer-spin-button {
  -webkit-appearance: none;
}

.length-sub {
  font-size: 0.5rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--subtle);
}

/* ── Generate button ── */
.generate-btn {
  width: 100%;
  background: rgba(15, 15, 15, 0.82);
  border: 1px solid rgba(0,0,0,0.15);
  color: rgba(255,255,255,0.92);
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  padding: 15px;
  cursor: pointer;
  border-radius: 10px;
  transition: all 0.18s;
  box-shadow: 0 1px 0 rgba(255,255,255,0.1) inset, 0 4px 12px rgba(0,0,0,0.15);
}

.generate-btn:hover {
  background: rgba(0, 0, 0, 0.9);
  box-shadow: 0 1px 0 rgba(255,255,255,0.1) inset, 0 6px 20px rgba(0,0,0,0.25);
  transform: translateY(-1px);
}

.generate-btn:active {
  transform: translateY(0);
  box-shadow: 0 1px 0 rgba(255,255,255,0.1) inset, 0 2px 6px rgba(0,0,0,0.2);
}

/* ── Warning ── */
.warning {
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: #b45309;
  background: rgba(251,191,36,0.12);
  border: 1px solid rgba(251,191,36,0.3);
  border-radius: 8px;
  padding: 10px 14px;
  display: none;
}

.warning.visible {
  display: block;
}