:root {
  --radius-xl: 24px;
  --radius-lg: 18px;
  --radius: 12px;
  --shadow-1: 0 1px 2px rgba(0,0,0,.25), 0 8px 24px rgba(0,0,0,.25);
  --shadow-2: 0 8px 30px rgba(0,0,0,.35);
  --blur: saturate(1.2) blur(16px);
  --dur-fast: 120ms;
  --dur: 220ms;
  --dur-slow: 420ms;
  --ease: cubic-bezier(.2,.8,.2,1);
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --bg: #f6f7fb;
  --bg-elev: rgba(255,255,255,.65);
  --stroke: rgba(16,24,40,.1);
  --text: #0a0b0f;
  --text-muted: #5b6470;
  --accent: #0a84ff;
  --accent-emph: #0066cc;
  --danger: #ff3b30;
  --danger-emph: #d70015;
  --glass: rgba(250,250,255,.55);
  --bg-gradient: radial-gradient(1200px 700px at 10% 0%, rgba(10,132,255,.12), transparent 50%),
                 radial-gradient(900px 600px at 85% 20%, rgba(48,209,88,.12), transparent 55%),
                 linear-gradient(180deg, #ffffff, #f5f7fa);
}

html[data-theme="dark"] {
  --bg: #0b0f14;
  --bg-elev: rgba(18,22,28,.6);
  --stroke: rgba(255,255,255,.08);
  --text: #edf1f7;
  --text-muted: #a2adbd;
  --accent: #64a8ff;
  --accent-emph: #3b82f6;
  --danger: #ff453a;
  --danger-emph: #ff3b30;
  --glass: rgba(16,20,24,.7);
  --bg-gradient: radial-gradient(1200px 700px at 10% 0%, rgba(100,168,255,.15), transparent 50%),
                 radial-gradient(900px 600px at 85% 20%, rgba(52,199,89,.14), transparent 55%),
                 linear-gradient(180deg, #0b0f14, #0e141b);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg-gradient);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--dur-slow) var(--ease), color var(--dur) var(--ease);
}

body::before {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none;
  background: radial-gradient(800px 800px at 20% 30%, rgba(255,255,255,.04), transparent 50%),
              radial-gradient(800px 800px at 80% 10%, rgba(255,255,255,.03), transparent 55%);
  mix-blend-mode: overlay;
  opacity: .6;
  transition: opacity var(--dur) var(--ease);
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  body::before { display: none; }
}

.wrap {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: clamp(16px, 4vw, 48px);
}

.card {
  width: min(720px, 92vw);
  border-radius: var(--radius-xl);
  background: var(--glass);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  box-shadow: var(--shadow-1);
  border: 1px solid var(--stroke);
  overflow: clip;
  position: relative;
}

.cardHeader {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: clamp(16px, 2vw, 22px) clamp(18px, 3vw, 28px);
  border-bottom: 1px solid var(--stroke);
  background: linear-gradient(180deg, rgba(255,255,255,.02), transparent);
}

.title {
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 700;
  letter-spacing: .2px;
}

.subtitle { color: var(--text-muted); font-weight: 500; }

.content {
  display: grid;
  gap: clamp(14px, 1.8vw, 22px);
  padding: clamp(18px, 3vw, 28px);
}

.field {
  display: grid;
  gap: 10px;
}

label { font-weight: 600; }
.hint { color: var(--text-muted); font-size: .925rem; }

.input, .output {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px;
  background: var(--bg-elev);
  border: 1px solid var(--stroke);
  border-radius: var(--radius-lg);
  padding: 12px 12px 12px 16px;
  box-shadow: var(--shadow-2);
}

input[type="text"], input[readonly] {
  width: 100%;
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.4;
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
}

input::placeholder { color: color-mix(in srgb, var(--text-muted) 70%, transparent); }

.btn {
  display: inline-grid;
  place-items: center;
  gap: 8px;
  height: 44px; min-width: 44px;
  padding: 0;
  border-radius: 999px;
  border: 1px solid var(--stroke);
  background: linear-gradient(180deg, color-mix(in srgb, var(--bg-elev) 60%, transparent), transparent);
  color: var(--text);
  cursor: pointer;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.btn:active { transform: translateY(1px) scale(.98); }
.btn:hover { background: color-mix(in srgb, var(--bg-elev) 85%, transparent); }

.btn.icon { width: 44px; }
.btn.primary { background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 18%, transparent), transparent); border-color: color-mix(in srgb, var(--accent) 35%, var(--stroke)); }
.btn.primary:hover { background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 28%, transparent), transparent); }
.btn.danger { background: linear-gradient(180deg, color-mix(in srgb, var(--danger) 18%, transparent), transparent); border-color: color-mix(in srgb, var(--danger) 35%, var(--stroke)); }
.btn.danger:hover { background: linear-gradient(180deg, color-mix(in srgb, var(--danger) 28%, transparent), transparent); }

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

.github-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 999px;
  border: 1px solid var(--stroke);
  background: linear-gradient(180deg, color-mix(in srgb, var(--bg-elev) 60%, transparent), transparent);
  color: var(--text);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.github-link:hover {
  background: color-mix(in srgb, var(--bg-elev) 85%, transparent);
}

.github-link:active {
  transform: translateY(1px) scale(.98);
}

.github-icon {
  width: 22px;
  height: 22px;
}

.status { font-size: .9rem; color: var(--text-muted); }

.row { display: grid; gap: 8px; grid-template-columns: 1fr auto; align-items: center; }

.copyToast {
  position: fixed; left: 50%; bottom: 16px; transform: translateX(-50%) translateY(20px);
  background: var(--bg-elev); border: 1px solid var(--stroke); border-radius: 999px; padding: 10px 14px;
  box-shadow: var(--shadow-2); opacity: 0; pointer-events: none;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.copyToast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.themeToggleIcon { width: 22px; height: 22px; display: grid; }
.themeToggleIcon > svg { grid-area: 1 / 1; transition: opacity var(--dur-fast) var(--ease), transform var(--dur) var(--ease); }
html[data-theme="dark"] .icon-sun { opacity: 0; transform: rotate(-20deg) scale(.8); }
html[data-theme="light"] .icon-moon { opacity: 0; transform: rotate(20deg) scale(.8); }

.footer { 
  padding: 12px 18px 18px; 
  display: flex; 
  justify-content: center; 
  align-items: center; 
  color: var(--text-muted); 
  font-size: .92rem; 
}
.footer a { 
  color: var(--accent); 
  text-decoration: none; 
  transition: color var(--dur) var(--ease);
}
.footer a:hover { 
  color: var(--accent-emph); 
}