:root {
	--accent: #156082;
	--bg: #f6f8fa;
	--fg: #1c2733;
	--muted: #5b6b7b;
	--border: #d5dde4;
	--error: #b3261e;
}
* { box-sizing: border-box; }
body {
	margin: 0;
	font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
	background: var(--bg);
	color: var(--fg);
	min-height: 100vh;
	display: flex;
	flex-direction: column;
}
header { padding: 28px 24px 8px; text-align: center; }
h1 { margin: 0 0 4px; font-size: 1.6rem; color: var(--accent); letter-spacing: .5px; }
.tagline { margin: 0; color: var(--muted); }
.tagline strong { color: var(--fg); }

main { flex: 1; width: 100%; max-width: 1400px; margin: 0 auto; padding: 16px 24px; }

#dropzone {
	border: 2px dashed var(--border);
	border-radius: 12px;
	background: #fff;
	padding: 48px 24px;
	text-align: center;
	cursor: pointer;
	transition: border-color .15s, background .15s;
}
#dropzone.over, #dropzone:focus-visible { border-color: var(--accent); background: #eef6fa; outline: none; }
.dz-icon { font-size: 2.2rem; margin-bottom: 8px; }
.filebtn {
	color: var(--accent);
	text-decoration: underline;
	cursor: pointer;
}
.filebtn input { display: none; }
.formats { margin-top: 18px; }
.badge {
	display: inline-block;
	padding: 3px 10px;
	margin: 2px 4px;
	border-radius: 999px;
	font-size: .8rem;
	color: #fff;
	background: var(--accent);
}
.badge.docx { background: #2b579a; }
.badge.pptx { background: #c43e1c; }
.badge.xlsx { background: #217346; }
.badge.vsdx { background: #3955a3; }

#toolbar {
	display: flex;
	align-items: center;
	gap: 16px;
	flex-wrap: wrap;
	background: #fff;
	border: 1px solid var(--border);
	border-radius: 8px;
	padding: 8px 14px;
	margin-bottom: 10px;
}
#filename { font-weight: 600; overflow-wrap: anywhere; }
#toolbar button {
	margin-left: auto;
	border: 1px solid var(--border);
	background: #fff;
	border-radius: 6px;
	padding: 6px 12px;
	cursor: pointer;
}
#toolbar button:hover { border-color: var(--accent); color: var(--accent); }

#status { min-height: 1.4em; color: var(--muted); font-size: .9rem; margin: 6px 2px; }
#status.error { color: var(--error); font-weight: 600; }

#viewer {
	background: #fff;
	border: 1px solid var(--border);
	border-radius: 8px;
	padding: 12px;
	overflow: auto;
}
#viewer:empty { display: none; }

footer {
	padding: 18px 24px 26px;
	text-align: center;
	color: var(--muted);
	font-size: .82rem;
}
footer a { color: var(--accent); }
code { background: #eceff2; padding: 1px 5px; border-radius: 4px; }

@media (prefers-reduced-motion: reduce) {
	* { transition: none !important; }
}