.sdt-tree {
	--sdt-yes: #1a7f4b;
	--sdt-no: #b32d2e;
	--sdt-accent: #1d3557;
	--sdt-border: rgba(0, 0, 0, 0.15);
	--sdt-bg: transparent;
	--sdt-radius: 6px;
	max-width: 42rem;
	margin: 1.5em 0;
	font: inherit;
	color: inherit;
}

.sdt-box {
	background: var(--sdt-bg);
	border: 1px solid var(--sdt-border);
	border-radius: var(--sdt-radius);
	padding: 1.25rem 1.5rem;
}

.sdt-trail {
	list-style: none;
	margin: 0 0 1.25rem;
	padding: 0 0 1rem;
	border-bottom: 1px solid var(--sdt-border);
	font-size: 0.9em;
	opacity: 0.8;
}
.sdt-trail li {
	display: flex;
	gap: 0.75rem;
	justify-content: space-between;
	margin: 0.35rem 0;
	padding: 0;
}
.sdt-trail-a { font-weight: 600; flex-shrink: 0; }
.sdt-trail-a--yes { color: var(--sdt-yes); }
.sdt-trail-a--no { color: var(--sdt-no); }

.sdt-step:focus { outline: none; }
.sdt-text {
	margin: 0 0 1rem;
	white-space: pre-line;
	line-height: 1.5;
}
.sdt-question { font-size: 1.3em; font-weight: 600; line-height: 1.35; }
.sdt-step--result .sdt-text { font-size: 1.1em; }

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

.sdt-button {
	display: inline-block;
	min-width: 6rem;
	padding: 0.65rem 1.5rem;
	border: 2px solid var(--sdt-accent);
	border-radius: var(--sdt-radius);
	background: transparent;
	color: var(--sdt-accent);
	font: inherit;
	font-weight: 600;
	text-align: center;
	text-decoration: none;
	cursor: pointer;
	transition: background-color 0.15s, color 0.15s;
}
.sdt-button--yes { border-color: var(--sdt-yes); color: var(--sdt-yes); }
.sdt-button--no { border-color: var(--sdt-no); color: var(--sdt-no); }
.sdt-button--yes:hover, .sdt-button--yes:focus-visible { background: var(--sdt-yes); color: #fff; }
.sdt-button--no:hover, .sdt-button--no:focus-visible { background: var(--sdt-no); color: #fff; }
.sdt-button--link { background: var(--sdt-accent); color: #fff; }
.sdt-button--link:hover, .sdt-button--link:focus-visible { opacity: 0.88; color: #fff; }
.sdt-button:focus-visible, .sdt-nav-btn:focus-visible { outline: 3px solid currentColor; outline-offset: 2px; }

.sdt-nav { display: flex; gap: 1rem; margin-top: 1rem; }
.sdt-nav:empty { display: none; }
.sdt-nav-btn {
	padding: 0;
	border: 0;
	background: none;
	color: inherit;
	font: inherit;
	font-size: 0.9em;
	text-decoration: underline;
	cursor: pointer;
	opacity: 0.8;
}
.sdt-nav-btn:hover { opacity: 1; }

@media (prefers-reduced-motion: reduce) {
	.sdt-button { transition: none; }
}