/* Treehouse theme: paper and wood by day, lantern light by night. */
:root {
	--bg: #f6efdc;
	--bg-dot: #eadfc2;
	--surface: #fffaf0;
	--surface-2: #f3e8d0;
	--text: #4a3523;
	--muted: #8a7258;
	--border: #e3d2b0;
	--wood: #a8713f;
	--wood-dark: #7c4f2a;
	--wood-text: #fff6e6;
	--accent: #5e9a4a;
	--accent-dark: #477a37;
	--accent-text: #ffffff;
	--accent-soft: #e2efcf;
	--berry: #d0688a;
	--berry-soft: #f8dde5;
	--sky: #5b93c7;
	--sky-soft: #dbe9f6;
	--danger: #b8492f;
	--shadow: 0 2px 0 #e3d2b0;
	--radius: 14px;
	--font-display: "Fredoka", "Nunito", ui-rounded, system-ui, sans-serif;
	--font-body: "Nunito", ui-rounded, system-ui, sans-serif;
	color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
	:root {
		--bg: #18211b;
		--bg-dot: #223026;
		--surface: #222d25;
		--surface-2: #2b382f;
		--text: #f2e8d5;
		--muted: #b3a68d;
		--border: #3a4a3e;
		--wood: #8a5a32;
		--wood-dark: #5e3b1f;
		--wood-text: #fbeed6;
		--accent: #9fd27f;
		--accent-dark: #7fb862;
		--accent-text: #15210f;
		--accent-soft: #2f4430;
		--berry: #f09ab6;
		--berry-soft: #4a2c37;
		--sky: #9cc5ec;
		--sky-soft: #26384a;
		--danger: #f0937b;
		--shadow: 0 2px 0 #121914;
	}
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
	margin: 0;
	color: var(--text);
	font: 16px/1.55 var(--font-body);
	background-color: var(--bg);
	background-image: radial-gradient(var(--bg-dot) 1.5px, transparent 1.5px);
	background-size: 22px 22px;
}

h1, h2, .brand { font-family: var(--font-display); }
h1 { font-size: 26px; font-weight: 600; margin: 0 0 4px; }
h2 { font-size: 14px; font-weight: 600; color: var(--muted); margin: 0 0 8px; letter-spacing: 0.02em; }
.muted { color: var(--muted); font-size: 14px; margin: 0; }
.error { color: var(--danger); font-size: 14px; margin: 0; }
.empty { color: var(--muted); padding: 24px 0; text-align: center; }
.empty::before {
	content: "";
	display: block;
	width: 44px;
	height: 44px;
	margin: 0 auto 8px;
	background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 21c0-6 1-11 8-16-1 7-3 12-8 16zm0 0c0-4-1-8-7-11 0 5 2 9 7 11z' fill='%235e9a4a' opacity='.7'/%3E%3C/svg%3E") center / contain no-repeat;
}

button, input, textarea { font: inherit; color: inherit; }

button {
	background: var(--surface);
	border: 1.5px solid var(--border);
	border-radius: 999px;
	padding: 5px 14px;
	cursor: pointer;
	font-weight: 600;
	box-shadow: var(--shadow);
	transition: transform 0.08s ease, background 0.15s ease;
}
button:hover { background: var(--surface-2); }
button:active { transform: translateY(1px); box-shadow: none; }
button.primary {
	background: var(--accent);
	color: var(--accent-text);
	border-color: var(--accent-dark);
	box-shadow: 0 3px 0 var(--accent-dark);
}
button.primary:hover { background: var(--accent-dark); }
button.danger { color: var(--danger); }
button.link { background: none; border: none; padding: 0; color: var(--accent-dark); box-shadow: none; font-weight: 700; }
button:disabled { opacity: 0.6; cursor: default; }

input, textarea {
	background: var(--surface);
	border: 1.5px solid var(--border);
	border-radius: 12px;
	padding: 8px 12px;
	width: 100%;
}
input:focus, textarea:focus, button:focus-visible { outline: 3px solid var(--accent-soft); border-color: var(--accent); outline-offset: 0; }
textarea { resize: vertical; }

.card {
	background: var(--surface);
	border: 1.5px solid var(--border);
	border-radius: 20px;
	padding: 18px;
	box-shadow: 0 4px 0 var(--border);
}

/* Login: the treehouse itself */
.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login form { width: min(380px, 100%); display: grid; gap: 12px; text-align: center; }
.login .art { width: 170px; height: auto; margin: -70px auto 0; display: block; }
.login h1 { font-size: 32px; }

/* Header: a wooden plank */
.top {
	display: flex;
	align-items: center;
	gap: 16px;
	padding: 10px 18px;
	background-color: var(--wood);
	background-image: repeating-linear-gradient(0deg, transparent 0 9px, rgb(0 0 0 / 0.06) 9px 10px);
	border-bottom: 4px solid var(--wood-dark);
	color: var(--wood-text);
	position: sticky;
	top: 0;
	z-index: 1;
}
.brand { font-weight: 600; font-size: 20px; display: flex; align-items: center; gap: 8px; }
.brand svg { width: 30px; height: 30px; }
.top nav { display: flex; gap: 6px; }
.top nav button {
	background: rgb(255 255 255 / 0.12);
	border-color: transparent;
	color: var(--wood-text);
	box-shadow: none;
}
.top nav button:hover { background: rgb(255 255 255 / 0.22); }
.top nav button.active {
	background: var(--surface);
	color: var(--text);
	box-shadow: 0 2px 0 var(--wood-dark);
}
.who { margin-left: auto; font-size: 14px; opacity: 0.9; }
.top .link { color: var(--wood-text); text-decoration: underline; text-underline-offset: 3px; }

.tab { display: grid; gap: 0; height: calc(100vh - 58px); }
.chat { grid-template-columns: 210px minmax(0, 1fr) auto; }
.notes { grid-template-columns: 270px minmax(0, 1fr); }
.files { display: block; overflow: auto; }

.side { background: var(--surface); border-right: 1.5px dashed var(--border); padding: 18px; overflow: auto; }
.side-head, .thread-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 10px; }
.side-head h2, .thread-head h2 { margin: 0; }
.pane { padding: 18px 26px; overflow: auto; display: flex; flex-direction: column; min-height: 0; }
.pane.wide { max-width: 960px; margin: 0 auto; display: block; }

.list { list-style: none; margin: 0 0 14px; padding: 0; display: grid; gap: 2px; }
.list button {
	width: 100%;
	text-align: left;
	border: none;
	background: none;
	box-shadow: none;
	display: flex;
	justify-content: space-between;
	align-items: center;
	padding: 5px 10px;
	font-weight: 600;
}
.list button.active { background: var(--accent-soft); color: var(--accent-dark); }
.badge { background: var(--berry); color: #fff; border-radius: 999px; font-size: 12px; padding: 0 8px; }

.inline { display: flex; gap: 6px; }

/* Chat */
#channel-title { font-size: 20px; color: var(--text); }
.messages { flex: 1; overflow: auto; display: flex; flex-direction: column; gap: 8px; padding: 4px 2px 12px; }
.msg {
	display: grid;
	grid-template-columns: 34px minmax(0, 1fr);
	gap: 0 10px;
	padding: 10px 12px;
	border-radius: 18px;
	background: var(--surface);
	border: 1.5px solid var(--border);
}
.msg.open { border-color: var(--accent); background: var(--accent-soft); }
.avatar {
	grid-row: span 3;
	width: 34px;
	height: 34px;
	border-radius: 50%;
	display: grid;
	place-items: center;
	font-family: var(--font-display);
	font-weight: 600;
	color: #fff;
	background: var(--wood);
}
.avatar.audrey { background: var(--berry); }
.avatar.jon { background: var(--sky); }
.msg-head { display: flex; gap: 8px; align-items: baseline; }
.msg-author { font-weight: 800; }
.msg-time { color: var(--muted); font-size: 12px; }
.msg-text { white-space: pre-wrap; overflow-wrap: anywhere; }
.msg-replies { font-size: 14px; margin-top: 2px; }

.composer { display: flex; gap: 8px; align-items: flex-end; padding-top: 12px; }
.composer textarea { border-radius: 18px; }

.thread {
	width: 350px;
	background: var(--surface-2);
	border-left: 1.5px dashed var(--border);
	padding: 18px;
	display: flex;
	flex-direction: column;
	min-height: 0;
}

/* Notes */
.tree, .tree ul { list-style: none; margin: 0; padding: 0; }
.tree ul { padding-left: 14px; border-left: 1.5px dotted var(--border); margin-left: 12px; }
.tree button {
	border: none;
	background: none;
	box-shadow: none;
	text-align: left;
	width: 100%;
	padding: 3px 10px 3px 28px;
	font-weight: 600;
	background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M5 19C5 10 11 5 20 4c0 9-5 15-15 15zm0 0 8-8' fill='%235e9a4a' stroke='%23477a37' stroke-width='1.2' stroke-linecap='round'/%3E%3C/svg%3E");
	background-repeat: no-repeat;
	background-position: 7px center;
	background-size: 15px;
}
.tree button.active { background-color: var(--accent-soft); color: var(--accent-dark); }

#note { background: var(--surface); border: 1.5px solid var(--border); border-radius: 22px; padding: 22px 26px; box-shadow: 0 4px 0 var(--border); }
.note-head { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 14px; padding-bottom: 12px; border-bottom: 1.5px dashed var(--border); }
.actions { display: flex; gap: 6px; flex-wrap: wrap; align-items: flex-start; }
.editor { display: grid; gap: 10px; }
.editor textarea { font-family: ui-monospace, Menlo, monospace; font-size: 14px; min-height: 50vh; }

.markdown { max-width: 760px; overflow-wrap: anywhere; }
.markdown h1, .markdown h2, .markdown h3 { color: var(--text); margin: 1.2em 0 0.4em; letter-spacing: 0; }
.markdown h1 { font-size: 24px; }
.markdown h2 { font-size: 20px; }
.markdown h3 { font-size: 17px; }
.markdown pre { background: var(--surface-2); padding: 12px; border-radius: 12px; overflow: auto; }
.markdown code { font-family: ui-monospace, Menlo, monospace; font-size: 0.9em; }
.markdown a { color: var(--accent-dark); }
.markdown blockquote { border-left: 4px solid var(--accent-soft); margin: 0; padding-left: 12px; color: var(--muted); }
.markdown table { border-collapse: collapse; }
.markdown th, .markdown td { border: 1.5px solid var(--border); padding: 4px 10px; }
.markdown img { max-width: 100%; border-radius: 12px; }
.markdown li::marker { color: var(--accent); }

/* Files */
.upload { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto; gap: 8px; margin-bottom: 8px; }
.file-table { width: 100%; border-collapse: separate; border-spacing: 0 8px; margin-top: 12px; }
.file-table th { text-align: left; font-size: 13px; color: var(--muted); font-weight: 700; padding: 0 12px; }
.file-table td { padding: 10px 12px; vertical-align: middle; background: var(--surface); border-top: 1.5px solid var(--border); border-bottom: 1.5px solid var(--border); }
.file-table td:first-child { border-left: 1.5px solid var(--border); border-radius: 16px 0 0 16px; font-weight: 700; }
.file-table td:last-child { border-right: 1.5px solid var(--border); border-radius: 0 16px 16px 0; text-align: right; white-space: nowrap; }
.file-table td:last-child .actions { justify-content: flex-end; }
.file-table .desc { color: var(--muted); font-size: 13px; font-weight: 400; }
.preview { margin-top: 16px; }
.preview img { max-width: 100%; border-radius: 12px; }
.preview pre { white-space: pre-wrap; overflow-wrap: anywhere; margin: 0; }

@media (max-width: 760px) {
	.tab { height: auto; }
	.chat, .notes { grid-template-columns: minmax(0, 1fr); }
	.side { border-right: none; border-bottom: 1.5px dashed var(--border); }
	.thread { width: auto; border-left: none; border-top: 1.5px dashed var(--border); }
	.messages { max-height: 60vh; }
	.pane { padding: 16px; }
	#note { padding: 16px; }
	.upload { grid-template-columns: minmax(0, 1fr); }
	.file-table th:nth-child(3), .file-table td:nth-child(3), .file-table th:nth-child(4), .file-table td:nth-child(4) { display: none; }
	.top { flex-wrap: wrap; }
	.top nav { order: 3; width: 100%; }
}