:root {
  --btn-ui-radius: 12px;
  --btn-ui-padding-y: 0.75rem;
  --btn-ui-padding-x: 1.35rem;
  --btn-ui-font-size: 0.95rem;
  --btn-ui-gap: 0.35rem;
  --btn-ui-primary-bg: #0f62fe;
  --btn-ui-primary-border: #0b52c1;
  --btn-ui-primary-text: #ffffff;
  --btn-ui-ghost-border: rgba(13, 23, 43, 0.4);
  --btn-ui-ghost-text: var(--text);
  --btn-ui-ghost-hover-bg: rgba(15, 23, 42, 0.08);
  --btn-ui-focus: rgba(15, 99, 255, 0.55);
  --btn-ui-disabled-opacity: 0.55;
  --btn-ui-primary-shadow: 0 12px 20px rgba(15, 39, 107, 0.25);
}

@media (prefers-color-scheme: dark) {
  :root {
    --btn-ui-primary-bg: #5b8dff;
    --btn-ui-primary-border: #4670c9;
    --btn-ui-primary-text: #0b1220;
    --btn-ui-ghost-border: rgba(255, 255, 255, 0.35);
    --btn-ui-ghost-text: #f8fbff;
    --btn-ui-ghost-hover-bg: rgba(255, 255, 255, 0.08);
    --btn-ui-focus: rgba(94, 165, 255, 0.55);
    --btn-ui-primary-shadow: 0 12px 24px rgba(4, 10, 26, 0.55);
  }
}

html[data-theme="dark"] {
  --btn-ui-primary-bg: #5b8dff;
  --btn-ui-primary-border: #4670c9;
  --btn-ui-primary-text: #0b1220;
  --btn-ui-ghost-border: rgba(255, 255, 255, 0.35);
  --btn-ui-ghost-text: #f8fbff;
  --btn-ui-ghost-hover-bg: rgba(255, 255, 255, 0.08);
  --btn-ui-focus: rgba(94, 165, 255, 0.55);
  --btn-ui-primary-shadow: 0 12px 24px rgba(4, 10, 26, 0.55);
}

html[data-theme="light"] {
  --btn-ui-primary-bg: #f8d7da;
  --btn-ui-primary-border: #efb6be;
  --btn-ui-primary-text: #000000;
  --btn-ui-ghost-border: rgba(239, 182, 190, 0.7);
  --btn-ui-ghost-text: #000000;
  --btn-ui-ghost-hover-bg: rgba(248, 215, 218, 0.55);
  --btn-ui-focus: rgba(239, 182, 190, 0.7);
  --btn-ui-primary-shadow: 0 12px 20px rgba(231, 166, 178, 0.18);
}
@media (prefers-color-scheme: light) {
  html:not([data-theme]) {
    --btn-ui-primary-bg: #f8d7da;
    --btn-ui-primary-border: #efb6be;
    --btn-ui-primary-text: #000000;
    --btn-ui-ghost-border: rgba(239, 182, 190, 0.7);
    --btn-ui-ghost-text: #000000;
    --btn-ui-ghost-hover-bg: rgba(248, 215, 218, 0.55);
    --btn-ui-focus: rgba(239, 182, 190, 0.7);
    --btn-ui-primary-shadow: 0 12px 20px rgba(231, 166, 178, 0.18);
  }
}

.btn-ui {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--btn-ui-gap);
  padding: var(--btn-ui-padding-y) var(--btn-ui-padding-x);
  font-size: var(--btn-ui-font-size);
  font-weight: 600;
  border-radius: var(--btn-ui-radius);
  border: 1px solid transparent;
  text-decoration: none;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
  color: inherit;
  background: transparent;
}

.btn-ui:focus-visible {
  outline: 2px solid var(--btn-ui-focus);
  outline-offset: 2px;
  box-shadow: 0 0 0 2px rgba(15, 62, 255, 0.35);
}

html[data-theme="light"] .btn-ui:focus-visible {
  box-shadow: 0 0 0 2px rgba(239, 182, 190, 0.3);
}
@media (prefers-color-scheme: light) {
  html:not([data-theme]) .btn-ui:focus-visible {
    box-shadow: 0 0 0 2px rgba(239, 182, 190, 0.3);
  }
}

.btn-ui[disabled] {
  opacity: var(--btn-ui-disabled-opacity);
  cursor: not-allowed;
  pointer-events: none;
  box-shadow: none;
}

.btn-ui--primary {
  background-color: var(--btn-ui-primary-bg);
  border-color: var(--btn-ui-primary-border);
  color: var(--btn-ui-primary-text);
  box-shadow: var(--btn-ui-primary-shadow);
}

.btn-ui--primary:not([disabled]):hover {
  transform: translateY(-1px);
  filter: brightness(1.05);
}

.btn-ui--primary:not([disabled]):active {
  transform: translateY(1px);
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.2);
}

html[data-theme="light"] .btn-ui--primary:not([disabled]):active {
  box-shadow: inset 0 2px 8px rgba(231, 166, 178, 0.2);
}
@media (prefers-color-scheme: light) {
  html:not([data-theme]) .btn-ui--primary:not([disabled]):active {
    box-shadow: inset 0 2px 8px rgba(231, 166, 178, 0.2);
  }
}

.btn-ui--ghost {
  border-color: var(--btn-ui-ghost-border);
  color: var(--btn-ui-ghost-text);
}

.btn-ui--ghost:not([disabled]):hover {
  background: var(--btn-ui-ghost-hover-bg);
}

.btn-ui--sm {
  padding: 0.45rem 0.95rem;
  font-size: 0.85rem;
}