:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --ink: #1c2230;
  --muted: #5f6b7a;
  --line: #e2e6ec;
  --focus: #2563eb;
  --success: #15803d;
  --success-soft: #e7f6ec;
  --error: #c62828;
  --error-soft: #fdecec;
  --info: #1d4ed8;
  --info-soft: #e8efff;
  --radius: 12px;
  --toast-width: 360px;
  --shadow: 0 10px 30px rgb(20 26 40 / 0.14);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

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

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.demo {
  max-inline-size: 640px;
  margin-inline: auto;
  padding: 4rem 1.25rem;
}

.demo h1 {
  margin-block: 0 0.5rem;
}

.demo p {
  margin-block: 0 1.5rem;
  color: var(--muted);
}

kbd {
  padding: 0.05em 0.4em;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--surface);
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.85em;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  padding: 0.7rem 1.1rem;
  border: 0;
  border-radius: 8px;
  color: #ffffff;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.btn-success {
  background: var(--success);
}

.btn-error {
  background: var(--error);
}

.btn-info {
  background: var(--info);
}

.btn:hover {
  filter: brightness(1.08);
}

.toast-region {
  position: fixed;
  inset-block-end: 1rem;
  inset-inline-end: 1rem;
  z-index: 100;
  inline-size: min(var(--toast-width), calc(100% - 2rem));
}

.toast-stack {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.toast {
  --tone: var(--info);
  --tone-soft: var(--info-soft);
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: start;
  gap: 0.75rem;
  padding: 0.85rem 0.85rem 1rem;
  border: 1px solid var(--line);
  border-inline-start: 4px solid var(--tone);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
  animation: toast-in 220ms ease-out;
}

.toast.is-leaving {
  animation: toast-out 200ms ease-in forwards;
}

.toast-success {
  --tone: var(--success);
  --tone-soft: var(--success-soft);
}

.toast-error {
  --tone: var(--error);
  --tone-soft: var(--error-soft);
}

.toast-icon {
  display: grid;
  place-items: center;
  inline-size: 1.75rem;
  block-size: 1.75rem;
  border-radius: 50%;
  background: var(--tone-soft);
  color: var(--tone);
  font-weight: 700;
}

.toast-title {
  margin: 0;
  font-weight: 600;
}

.toast-message {
  margin: 0.15rem 0 0;
  color: var(--muted);
  font-size: 0.925rem;
}

.toast-close {
  display: grid;
  place-items: center;
  inline-size: 2rem;
  block-size: 2rem;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
}

.toast-close:hover {
  background: var(--bg);
  color: var(--ink);
}

.toast-progress {
  position: absolute;
  inset-inline: 0;
  inset-block-end: 0;
  block-size: 3px;
  background: var(--tone);
  opacity: 0.35;
  transform-origin: left;
  animation: countdown var(--duration, 5s) linear forwards;
}

.toast.is-paused .toast-progress {
  animation-play-state: paused;
}

[dir="rtl"] .toast-progress {
  transform-origin: right;
}

@keyframes countdown {
  to {
    transform: scaleX(0);
  }
}

@media (max-width: 480px) {
  .toast-region {
    inset-inline: 0.75rem;
    inset-block-end: 0.75rem;
    inline-size: auto;
  }

  .demo {
    padding-block: 2.5rem;
  }

  .actions {
    flex-direction: column;
  }

  .btn {
    inline-size: 100%;
  }
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.97);
  }
}

@keyframes toast-out {
  to {
    opacity: 0;
    transform: scale(0.95);
  }
}

@media (prefers-reduced-motion: reduce) {
  .toast,
  .toast.is-leaving,
  .toast-progress {
    animation: none;
  }
}