:root {
  --bg: #0b1120;
  --surface: #131b2e;
  --surface-2: #182238;
  --border: #253048;
  --border-soft: #1c2740;
  --text: #e8ecf4;
  --muted: #8b95a8;
  --muted-soft: #5c6884;
  --accent: #5eead4;
  --accent-dim: #2f7d72;
  --amber: #fbbf24;
  --danger: #f87171;

  --font-display: "Space Grotesk", sans-serif;
  --font-body: "Inter", sans-serif;
  --font-mono: "JetBrains Mono", monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* background grid texture, signals "network/link" */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--border-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-soft) 1px, transparent 1px);
  background-size: 42px 42px;
  -webkit-mask-image: radial-gradient(ellipse 60% 45% at 50% 12%, #000 40%, transparent 85%);
  mask-image: radial-gradient(ellipse 60% 45% at 50% 12%, #000 40%, transparent 85%);
  opacity: 0.6;
}

/* ---------- topbar ---------- */
.topbar {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 22px 32px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
}

.brand-mark { color: var(--accent); display: flex; }

.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
}

.brand-dot { color: var(--accent); }

.domain-config {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 7px 8px 7px 16px;
}

.domain-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted-soft);
  white-space: nowrap;
}

.domain-input {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 6px 14px;
  width: 190px;
  outline: none;
  transition: border-color 0.15s ease;
}

.domain-input:focus { border-color: var(--accent); }
.domain-input::placeholder { color: var(--muted-soft); }

/* ---------- stage / hero ---------- */
.stage {
  position: relative;
  z-index: 1;
  flex: 1;
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  padding: 40px 24px 80px;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.hero { text-align: center; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 14px;
}

.headline {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 2.9rem);
  line-height: 1.15;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}

.headline em {
  font-style: normal;
  color: var(--accent);
}

.sub {
  color: var(--muted);
  font-size: 1rem;
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.55;
}

/* ---------- compressor form ---------- */
.compressor-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  box-shadow: 0 20px 60px -30px rgba(0,0,0,0.6);
}

.field { display: flex; flex-direction: column; gap: 8px; }

.field label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted-soft);
}

.field label .optional {
  text-transform: none;
  letter-spacing: normal;
  color: var(--muted-soft);
  opacity: 0.7;
}

#longUrl {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  padding: 14px 16px;
  outline: none;
  transition: border-color 0.15s ease;
  width: 100%;
}

#longUrl:focus { border-color: var(--accent); }
#longUrl::placeholder { color: var(--muted-soft); }

/* the signature element: two nodes connected by a pulsing link line,
   representing the long url being compressed into a short one */
.link-visual {
  display: flex;
  align-items: center;
  gap: 0;
  height: 20px;
  padding: 0 4px;
}

.node {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  flex-shrink: 0;
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.link-line {
  flex: 1;
  height: 1px;
  background: var(--border);
  margin: 0 6px;
  position: relative;
  overflow: hidden;
  transition: background 0.3s ease;
}

.link-pulse {
  position: absolute;
  top: 0;
  left: -30%;
  width: 30%;
  height: 100%;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
}

.link-visual.is-active .node {
  background: var(--accent);
  box-shadow: 0 0 10px rgba(94, 234, 212, 0.6);
}

.link-visual.is-active .link-line { background: var(--accent-dim); }

.link-visual.is-active .link-pulse {
  opacity: 1;
  animation: pulse-travel 1.1s ease-in-out infinite;
}

@keyframes pulse-travel {
  0% { left: -30%; }
  100% { left: 100%; }
}

.slug-wrap {
  display: flex;
  align-items: stretch;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.15s ease;
}

.slug-wrap:focus-within { border-color: var(--accent); }

.slug-prefix {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--muted-soft);
  padding: 14px 0 14px 16px;
  white-space: nowrap;
  display: flex;
  align-items: center;
}

#customSlug {
  background: transparent;
  border: none;
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  padding: 14px 16px 14px 4px;
  outline: none;
  width: 100%;
  min-width: 0;
}

#customSlug::placeholder { color: var(--muted-soft); }

.btn-shorten {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--accent);
  color: #06231f;
  border: none;
  border-radius: 12px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.98rem;
  padding: 15px 20px;
  cursor: pointer;
  transition: transform 0.12s ease, filter 0.12s ease;
}

.btn-shorten:hover { filter: brightness(1.08); }
.btn-shorten:active { transform: scale(0.98); }

.form-error {
  margin: 0;
  color: var(--danger);
  font-size: 0.85rem;
  min-height: 1em;
}

/* ---------- result stamp ---------- */
.result {
  background: var(--surface);
  border: 1px dashed var(--accent-dim);
  border-radius: 16px;
  padding: 22px 24px;
  animation: stamp-in 0.35s ease;
}

@keyframes stamp-in {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-stamp {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.stamp-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 999px;
  padding: 3px 10px;
}

.stamp-code {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text);
  flex: 1;
  min-width: 200px;
  word-break: break-all;
}

.btn-copy {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 12px;
  font-family: var(--font-body);
  font-size: 0.82rem;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.btn-copy:hover { border-color: var(--accent); color: var(--accent); }
.btn-copy.is-copied { border-color: var(--accent); color: var(--accent); }

.result-original {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.85rem;
  word-break: break-all;
}

/* ---------- manifest / history ---------- */
.manifest-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.manifest-head h2 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin: 0;
  color: var(--text);
}

.btn-clear {
  background: none;
  border: none;
  color: var(--muted-soft);
  font-size: 0.8rem;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.btn-clear:hover { color: var(--danger); }

.manifest-empty {
  border: 1px dashed var(--border);
  border-radius: 14px;
  padding: 28px;
  text-align: center;
  color: var(--muted-soft);
  font-size: 0.9rem;
}

.manifest-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.manifest-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 16px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
}

.manifest-item .item-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted-soft);
  width: 24px;
}

.manifest-item .item-body { min-width: 0; }

.manifest-item .item-short {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.9rem;
  display: block;
}

.manifest-item .item-long {
  color: var(--muted);
  font-size: 0.8rem;
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-top: 2px;
}

.manifest-item .item-actions {
  display: flex;
  gap: 8px;
}

.item-actions button {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 8px;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.item-actions button:hover { color: var(--accent); border-color: var(--accent); }
.item-actions button.danger:hover { color: var(--danger); border-color: var(--danger); }

/* ---------- setup note ---------- */
.setup-note {
  border-top: 1px solid var(--border-soft);
  padding-top: 24px;
  margin-top: 8px;
}

.setup-note h3 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  margin: 0 0 10px;
  color: var(--muted);
}

.setup-note p {
  color: var(--muted-soft);
  font-size: 0.85rem;
  line-height: 1.6;
  margin: 0;
}

.mono {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.82rem;
}

/* ---------- footer ---------- */
.page-footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 20px;
  color: var(--muted-soft);
  font-size: 0.78rem;
}

/* ---------- responsive ---------- */
@media (max-width: 560px) {
  .topbar { padding: 18px 18px; }
  .domain-config { width: 100%; justify-content: space-between; }
  .domain-input { width: 130px; }
  .stage { padding: 24px 16px 60px; gap: 32px; }
  .compressor-form { padding: 20px; }
  .manifest-item { grid-template-columns: 1fr auto; }
  .manifest-item .item-index { display: none; }
}

/* keyboard focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

#totalClicks {
    margin: 15px 0;
    padding: 10px;
    border-radius: 10px;
    background: #1e293b;
    color: white;
    font-size: 16px;
    font-weight: bold;
    text-align: center;
}