:root {
  --bg: #0a0a0b;
  --bg-elev: #111114;
  --bg-elev-2: #16161a;
  --border: #1f1f24;
  --border-strong: #2a2a31;
  --text: #ededf0;
  --text-dim: #9a9aa3;
  --text-faint: #5e5e68;
  --accent: #6366f1;
  --accent-glow: #818cf8;
  --accent-soft: rgba(99, 102, 241, 0.12);
  --danger: #f87171;
  --success: #34d399;
  --radius: 14px;
  --radius-sm: 8px;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono",
    Menlo, Consolas, monospace;
  --shadow-lg: 0 30px 60px -20px rgba(0, 0, 0, 0.5),
    0 8px 24px -8px rgba(0, 0, 0, 0.4);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(
      ellipse 80% 50% at 50% -10%,
      rgba(99, 102, 241, 0.18) 0%,
      transparent 60%
    ),
    radial-gradient(
      ellipse 50% 40% at 0% 100%,
      rgba(56, 189, 248, 0.08) 0%,
      transparent 60%
    );
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(
    ellipse 80% 60% at 50% 30%,
    #000 30%,
    transparent 75%
  );
  -webkit-mask-image: radial-gradient(
    ellipse 80% 60% at 50% 30%,
    #000 30%,
    transparent 75%
  );
  pointer-events: none;
  z-index: 0;
}

.bg-glow {
  position: fixed;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 60vw;
  height: 60vw;
  max-width: 800px;
  max-height: 800px;
  background: radial-gradient(
    circle,
    rgba(99, 102, 241, 0.18) 0%,
    transparent 60%
  );
  filter: blur(60px);
  pointer-events: none;
  z-index: 0;
  animation: drift 18s ease-in-out infinite;
}

@keyframes drift {
  0%,
  100% {
    transform: translateX(-50%) translateY(0);
  }
  50% {
    transform: translateX(-50%) translateY(20px);
  }
}

.shell {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 24px 64px;
  display: flex;
  flex-direction: column;
  gap: 32px;
  min-height: 100vh;
}

.brand {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.01em;
  flex-wrap: wrap;
}

.brand-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.privacy-banner {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  color: var(--success);
  background: rgba(52, 211, 153, 0.08);
  border: 1px solid rgba(52, 211, 153, 0.25);
  padding: 5px 10px;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.privacy-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 8px rgba(52, 211, 153, 0.8);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(0.85); }
}

.logo {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-glow));
  display: grid;
  place-items: center;
  box-shadow: 0 4px 14px -4px rgba(99, 102, 241, 0.5);
}

.logo-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 8px #fff;
}

.brand-name {
  color: var(--text);
}

.brand-tag {
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 13px;
}

.hero {
  text-align: center;
  padding: 24px 0 8px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
}

.hero h1 {
  margin: 0;
  font-size: clamp(28px, 6vw, 44px);
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.025em;
  max-width: 18ch;
}

.accent {
  background: linear-gradient(120deg, var(--accent) 20%, var(--accent-glow));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  margin: 0;
  max-width: 56ch;
  color: var(--text-dim);
  font-size: clamp(14px, 2.5vw, 16px);
  line-height: 1.6;
}

.card {
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.02),
    rgba(255, 255, 255, 0)
  ),
  var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

#shorten-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.input-row {
  display: flex;
  gap: 10px;
  align-items: stretch;
}

.input-wrap {
  position: relative;
  flex: 1;
  min-width: 0;
  display: flex;
}

#long-url {
  flex: 1;
  min-width: 0;
  padding: 14px 42px 14px 16px;
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--text);
  background: var(--bg-elev-2);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 120ms ease, box-shadow 120ms ease;
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
}

.clear-btn {
  position: absolute;
  top: 50%;
  right: 8px;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  color: var(--text-dim);
  cursor: pointer;
  padding: 0;
  transition: color 120ms ease, background 120ms ease, border-color 120ms ease, transform 120ms ease, opacity 120ms ease;
}

.clear-btn[hidden] {
  display: none;
}

.clear-btn:hover {
  color: var(--danger);
  border-color: rgba(248, 113, 113, 0.4);
  background: rgba(248, 113, 113, 0.08);
}

.clear-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.clear-btn:active {
  transform: translateY(-50%) scale(0.92);
}

#long-url::placeholder {
  color: var(--text-faint);
}

#long-url:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

#submit-btn {
  position: relative;
  padding: 0 22px;
  min-height: 48px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(180deg, var(--accent), #4f46e5);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform 100ms ease, box-shadow 100ms ease, opacity 120ms ease;
  white-space: nowrap;
  box-shadow: 0 6px 16px -6px rgba(99, 102, 241, 0.55),
    inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

#submit-btn:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px -8px rgba(99, 102, 241, 0.65),
    inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

#submit-btn:active:not(:disabled) {
  transform: translateY(0);
}

#submit-btn:disabled {
  opacity: 0.7;
  cursor: progress;
}

.btn-spinner {
  display: none;
  width: 16px;
  height: 16px;
  margin-left: 8px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  vertical-align: middle;
  animation: spin 600ms linear infinite;
}

#submit-btn.loading .btn-spinner {
  display: inline-block;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.error {
  margin: 0;
  padding: 10px 12px;
  font-size: 13px;
  color: var(--danger);
  background: rgba(248, 113, 113, 0.08);
  border: 1px solid rgba(248, 113, 113, 0.2);
  border-radius: var(--radius-sm);
}

.result {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed var(--border-strong);
  animation: rise 220ms ease;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.result-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.result-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.hidden-count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-glow);
  background: var(--accent-soft);
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid rgba(99, 102, 241, 0.25);
}

.link-box {
  display: flex;
  align-items: stretch;
  gap: 8px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 6px 6px 6px 14px;
}

.short-link {
  flex: 1;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  display: flex;
  align-items: center;
  word-break: break-all;
  user-select: all;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease;
  flex-shrink: 0;
}

.copy-btn:hover {
  background: var(--bg-elev-2);
  border-color: var(--accent);
  color: var(--accent-glow);
}

.copy-btn .icon-check {
  display: none;
}

.copy-btn.copied {
  color: var(--success);
  border-color: rgba(52, 211, 153, 0.4);
  background: rgba(52, 211, 153, 0.08);
}

.copy-btn.copied .icon-copy {
  display: none;
}

.copy-btn.copied .icon-check {
  display: inline;
}

.result-hint {
  margin: 10px 0 0;
  font-size: 12px;
  color: var(--text-faint);
  text-align: center;
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 8px;
}

.feature {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: border-color 150ms ease, transform 150ms ease;
}

.feature:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.feature-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-glow);
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 16px;
  border: 1px solid rgba(99, 102, 241, 0.25);
}

.feature h2 {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.feature p {
  margin: 0;
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.5;
}

.cross-promo {
  margin-top: 4px;
}

.cross-promo-card {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  align-items: start;
  padding: 20px;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.02),
    rgba(255, 255, 255, 0)
  ),
  var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  transition: border-color 150ms ease, transform 150ms ease,
    box-shadow 150ms ease;
}

.cross-promo-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    600px circle at 0% 0%,
    rgba(99, 102, 241, 0.1),
    transparent 55%
  );
  pointer-events: none;
}

.cross-promo-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
  box-shadow: 0 14px 30px -18px rgba(99, 102, 241, 0.55);
}

.cross-promo-card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.cross-promo-icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  font-size: 26px;
  line-height: 1;
  border-radius: 12px;
  background: var(--accent-soft);
  border: 1px solid rgba(99, 102, 241, 0.25);
  box-shadow: 0 4px 14px -6px rgba(99, 102, 241, 0.5);
}

.cross-promo-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.cross-promo-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-glow);
}

.cross-promo-title {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
  line-height: 1.3;
}

.cross-promo-lede {
  margin: 0;
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.55;
}

.cross-promo-uses {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.cross-promo-uses li {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  padding: 4px 9px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.cross-promo-cta {
  margin-top: 4px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-glow);
}

.cross-promo-arrow {
  transition: transform 150ms ease;
}

.cross-promo-card:hover .cross-promo-arrow {
  transform: translateX(3px);
}

.footer {
  margin-top: auto;
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
  color: var(--text-faint);
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

.footer a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 120ms ease;
}

.footer a:hover {
  color: var(--accent-glow);
}

.copy {
  font-family: var(--font-sans);
}

.footer-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
}

.runtime-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--text-dim);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 5px 10px;
  border-radius: 999px;
  letter-spacing: 0.04em;
}

.runtime-pill .pulse {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-glow);
  box-shadow: 0 0 6px var(--accent-glow);
  animation: pulse 1.6s ease-in-out infinite;
}

.runtime-label {
  text-transform: uppercase;
  color: var(--text-faint);
  font-size: 10px;
}

.runtime-value {
  color: var(--accent-glow);
  font-weight: 600;
  min-width: 1.5ch;
  text-align: right;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 640px) {
  .shell {
    padding: 20px 16px 40px;
    gap: 24px;
  }

  .input-row {
    flex-direction: column;
  }

  #submit-btn {
    padding: 14px 20px;
    min-height: 48px;
  }

  .clear-btn {
    width: 32px;
    height: 32px;
    right: 6px;
  }

  #long-url {
    padding-right: 48px;
  }

  .features {
    grid-template-columns: 1fr;
  }

  .cross-promo-card {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 18px;
  }

  .cross-promo-title {
    font-size: 16px;
  }

  .link-box {
    flex-direction: column;
    padding: 10px;
  }

  .short-link {
    padding: 8px 4px;
    word-break: break-all;
    white-space: normal;
  }

  .copy-btn {
    justify-content: center;
    padding: 10px;
  }

  .footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .brand {
    gap: 8px;
  }

  .privacy-banner {
    font-size: 11px;
    padding: 4px 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .bg-glow,
  .result {
    animation: none;
  }
  .feature {
    transition: none;
  }
  .cross-promo-card,
  .cross-promo-arrow {
    transition: none;
  }
  .cross-promo-card:hover {
    transform: none;
  }
  .cross-promo-card:hover .cross-promo-arrow {
    transform: none;
  }
}