:root {
	--ink: #1f2933;
	--muted: #6b7280;
	--line: #d9dee3;
	--accent: #2563eb;
	--danger: #b91c1c;
	--bg: #f9fafb;
	/* the top bar's height: the sidebar starts under it */
	--topbar: 3.5rem;
	--sidebar: 13rem;
}

* {
	box-sizing: border-box;
}

body {
	margin: 0;
	font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
	color: var(--ink);
	background: var(--bg);
}


a {
	color: var(--accent);
}

input,
button {
	font: inherit;
	padding: 0.4rem 0.6rem;
	border: 1px solid var(--line);
	border-radius: 6px;
	background: #fff;
	color: var(--ink);
}

button {
	cursor: pointer;
	background: var(--accent);
	color: #fff;
	border-color: var(--accent);
}

/* ─── machines page ──────────────────────────────────────────────────────── */

.topbar {
	position: sticky;
	top: 0;
	z-index: 20;
	display: flex;
	align-items: center;
	gap: 0.75rem;
	min-height: var(--topbar);
	padding: 0 1rem;
	background: #fff;
	border-bottom: 1px solid var(--line);
}

.brand {
	display: inline-flex;
	align-items: center;
	gap: 0.5rem;
	font-weight: 700;
	font-size: 1.25rem;
	color: var(--ink);
	text-decoration: none;
}

.whoami {
	margin-left: auto;
	display: flex;
	align-items: center;
	gap: 0.6rem;
	font-size: 0.9rem;
	color: var(--muted);
	min-width: 0;
}

.whoami .email {
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}

.badge {
	padding: 0.1rem 0.5rem;
	border-radius: 999px;
	background: #eef2ff;
	color: #4338ca;
	font-size: 0.75rem;
	font-weight: 600;
}

.whoami form {
	margin: 0;
}

button.quiet {
	background: #fff;
	color: var(--ink);
	border-color: var(--line);
}

button.quiet:hover {
	border-color: #9ca3af;
}

.content {
	max-width: 900px;
	margin: 0 auto;
	padding: 1.5rem 1rem 4rem;
}

.content h1 {
	margin: 0 0 1rem;
	font-size: 1.5rem;
}

.empty {
	padding: 2rem 1.5rem;
	text-align: center;
	color: var(--muted);
	background: #fff;
	border: 1px dashed var(--line);
	border-radius: 16px;
}

.machines {
	display: flex;
	flex-direction: column;
	gap: 0.75rem;
	margin: 0;
	padding: 0;
	list-style: none;
}

.machine {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 0.75rem 1rem;
	padding: 1rem 1.25rem;
	background: #fff;
	border: 1px solid var(--line);
	border-radius: 14px;
	box-shadow: 0 4px 14px rgb(30 41 59 / 5%);
}

.machine-main {
	flex: 1;
	min-width: 12rem;
}

.machine-name {
	font-weight: 600;
}

.machine-meta {
	font-size: 0.85rem;
	color: var(--muted);
}

.machine-ip {
	font-family: ui-monospace, Menlo, Consolas, monospace;
}

.machine-ssh {
	display: flex;
	align-items: center;
	gap: 0.25rem;
	margin-top: 0.3rem;
	font-size: 0.8rem;
}

.machine-ssh code {
	padding: 0.15rem 0.45rem;
	border-radius: 6px;
	background: #f3f4f6;
	overflow-wrap: anywhere;
}

.machine-actions {
	display: flex;
	gap: 0.5rem;
}

.machine-actions form {
	margin: 0;
}

.status {
	display: inline-block;
	min-width: 6.5rem;
	padding: 0.2rem 0.6rem;
	border-radius: 999px;
	font-size: 0.75rem;
	font-weight: 700;
	letter-spacing: 0.04em;
	text-align: center;
	background: #f3f4f6;
	color: var(--muted);
}

.status-running {
	background: #dcfce7;
	color: #166534;
}

.status-suspended,
.status-stopped {
	background: #fef3c7;
	color: #92400e;
}

.footer {
	text-align: center;
	font-size: 0.85rem;
	color: var(--muted);
}

/* ─── landing page ─────────────────────────────────────────────────────── */

.landing {
	min-height: 100vh;
	background: var(--bg);
}

.landing-grid {
	display: grid;
	grid-template-columns: minmax(0, 5fr) minmax(0, 4fr);
	align-items: start;
	min-height: 100vh;
}

.scene {
	position: sticky;
	top: 0;
	height: 100vh;
	overflow: hidden;
	display: flex;
	flex-direction: column;
	gap: 1.5rem;
	padding: 2.5rem;
	color: #fff;
	background:
		radial-gradient(60% 40% at 20% 20%, rgb(244 114 182 / 25%), transparent 70%),
		radial-gradient(50% 40% at 80% 80%, rgb(96 165 250 / 25%), transparent 70%),
		linear-gradient(160deg, #1e1b4b 0%, #312e81 45%, #0f172a 100%);
}

.scene-art {
	flex: 1;
	min-height: 0;
	width: 100%;
	object-fit: contain;
	object-position: center;
	filter: drop-shadow(0 20px 40px rgb(0 0 0 / 35%));
}

.scene-copy {
	position: relative;
	max-width: 30rem;
	padding: 1.25rem 1.5rem;
	border-radius: 16px;
	background: rgb(15 23 42 / 55%);
	backdrop-filter: blur(6px);
	box-shadow: 0 10px 40px rgb(0 0 0 / 30%);
}

.scene-kicker {
	margin: 0 0 0.5rem;
	font-size: 0.75rem;
	font-weight: 600;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	color: #c7d2fe;
}

.scene-copy h2 {
	margin: 0 0 0.5rem;
	font-size: 1.6rem;
	line-height: 1.2;
}

.scene-copy p {
	margin: 0;
	color: #e0e7ff;
}

.panel {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	padding: 2rem 1.5rem;
	background:
		radial-gradient(40% 30% at 100% 0%, rgb(99 102 241 / 8%), transparent 70%),
		var(--bg);
}

.card {
	width: 100%;
	max-width: 420px;
	padding: 2rem 2rem 1.5rem;
	background: #fff;
	border: 1px solid var(--line);
	border-radius: 20px;
	box-shadow: 0 20px 60px rgb(30 41 59 / 10%);
}

.brand-lg {
	display: inline-flex;
	align-items: center;
	gap: 0.5rem;
	font-size: 1.1rem;
	letter-spacing: 0.02em;
	color: var(--muted);
}

.brand-mark {
	width: 26px;
	height: 26px;
}

.card h1 {
	margin: 1rem 0 0.25rem;
	font-size: 1.9rem;
	letter-spacing: -0.02em;
}

.lede {
	margin: 0 0 1.25rem;
	color: var(--muted);
}

.google {
	position: relative;
	min-height: 44px;
}

.gsi-slot {
	display: flex;
	justify-content: center;
}

.gsi-placeholder {
	position: absolute;
	inset: 0;
	margin: 0 auto;
	max-width: 360px;
	border-radius: 6px;
	background: linear-gradient(90deg, #eef0f4 25%, #f8f9fb 50%, #eef0f4 75%);
	background-size: 200% 100%;
	animation: shimmer 1.4s linear infinite;
	pointer-events: none;
}

@keyframes shimmer {
	to {
		background-position: -200% 0;
	}
}

.hint {
	margin: 0.5rem 0 0;
	font-size: 0.85rem;
	color: var(--muted);
	text-align: center;
}

.divider {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	margin: 1.25rem 0;
	font-size: 0.8rem;
	color: var(--muted);
	text-transform: uppercase;
	letter-spacing: 0.08em;
}

.divider::before,
.divider::after {
	content: "";
	flex: 1;
	height: 1px;
	background: var(--line);
}

.email-form {
	display: flex;
	flex-direction: column;
	gap: 0.75rem;
}

.field {
	display: flex;
	flex-direction: column;
	gap: 0.3rem;
	font-size: 0.85rem;
	font-weight: 600;
	color: var(--ink);
}

.field input {
	width: 100%;
	padding: 0.65rem 0.8rem;
	font-weight: 400;
	border-radius: 10px;
	transition: border-color 0.15s, box-shadow 0.15s;
}

.field input:focus {
	outline: none;
	border-color: var(--accent);
	box-shadow: 0 0 0 3px rgb(37 99 235 / 18%);
}

.password-field {
	position: relative;
	display: block;
}

.password-field input {
	padding-right: 4rem;
}

.password-field .link {
	position: absolute;
	top: 50%;
	right: 0.5rem;
	transform: translateY(-50%);
	font-size: 0.8rem;
}

button.link {
	padding: 0.2rem 0.4rem;
	background: none;
	border: none;
	color: var(--accent);
	font-weight: 600;
}

button.link:hover {
	text-decoration: underline;
}

button.primary {
	margin-top: 0.25rem;
	padding: 0.7rem 1rem;
	font-weight: 600;
	border-radius: 10px;
	background: linear-gradient(135deg, #4f46e5, #2563eb);
	border-color: transparent;
	box-shadow: 0 6px 16px rgb(37 99 235 / 25%);
	transition: transform 0.1s, box-shadow 0.15s;
}

button.primary:hover {
	box-shadow: 0 8px 22px rgb(37 99 235 / 35%);
}

button.primary:active {
	transform: translateY(1px);
}

button:disabled {
	opacity: 0.6;
	cursor: wait;
}

.switch {
	margin: 0;
	font-size: 0.85rem;
	text-align: center;
	color: var(--muted);
}

.providers {
	display: flex;
	flex-direction: column;
	gap: 0.6rem;
}

.provider {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	padding: 0.6rem 0.9rem;
	border: 1px solid var(--line);
	border-radius: 10px;
	background: #fff;
	color: var(--ink);
	font-weight: 500;
	text-decoration: none;
	transition: border-color 0.15s, box-shadow 0.15s, transform 0.1s;
}

.provider img {
	width: 20px;
	height: 20px;
}

.provider span {
	flex: 1;
	text-align: center;
	margin-right: 20px;
}

.provider:hover {
	border-color: #9ca3af;
	box-shadow: 0 4px 12px rgb(30 41 59 / 8%);
}

.provider:active {
	transform: translateY(1px);
}

.provider.off {
	opacity: 0.5;
	cursor: not-allowed;
	box-shadow: none;
	transform: none;
}

.dev-login {
	margin-top: 1.5rem;
	padding: 0.75rem 1rem;
	border: 1px dashed var(--line);
	border-radius: 10px;
	font-size: 0.85rem;
	color: var(--muted);
}

.dev-row {
	display: flex;
	gap: 0.5rem;
	margin-top: 0.5rem;
}

.dev-row input {
	flex: 1;
	min-width: 0;
}

.dev-row button {
	white-space: nowrap;
}

.warning {
	color: var(--danger);
}

.card .warning {
	margin: 0 0 1rem;
	padding: 0.6rem 0.8rem;
	border-radius: 10px;
	background: #fef2f2;
	border: 1px solid #fecaca;
	font-size: 0.9rem;
}

.landing .footer {
	padding: 1.5rem 0 0;
}

@media (max-width: 900px) {
	.landing-grid {
		grid-template-columns: minmax(0, 1fr);
	}

	.scene {
		position: static;
		height: auto;
		padding: 1.5rem;
	}

	.scene-art {
		flex: none;
		height: 300px;
	}

	.scene-copy h2 {
		font-size: 1.25rem;
	}

	.card {
		padding: 1.5rem 1.25rem;
	}
}

@media (prefers-reduced-motion: reduce) {
	.gsi-placeholder {
		animation: none;
	}
}

/* ─── students table (admin) ─────────────────────────────────────────────── */

.content h2 {
	margin: 2.5rem 0 0.5rem;
	font-size: 1.25rem;
}

.hint-left {
	margin: 0 0 1rem;
	font-size: 0.9rem;
	color: var(--muted);
}

.students {
	overflow-x: auto;
	background: #fff;
	border: 1px solid var(--line);
	border-radius: 14px;
	font-size: 0.9rem;
}

.student {
	display: grid;
	grid-template-columns: minmax(12rem, 2fr) minmax(6rem, 1fr) minmax(8rem, 1fr) minmax(14rem, 1.5fr);
	align-items: center;
	gap: 0.5rem 1rem;
	min-width: 44rem;
	padding: 0.6rem 0.9rem;
	border-bottom: 1px solid var(--line);
}

.student:last-child {
	border-bottom: 0;
}

.student.head {
	font-size: 0.75rem;
	text-transform: uppercase;
	letter-spacing: 0.06em;
	color: var(--muted);
}

.student.pending {
	color: var(--muted);
}

.source {
	font-size: 0.75rem;
	color: var(--muted);
}

.assign {
	display: flex;
	gap: 0.4rem;
	margin: 0;
}

.assign select {
	font: inherit;
	padding: 0.3rem 0.5rem;
	border: 1px solid var(--line);
	border-radius: 6px;
	background: #fff;
}

/* ─── messages and the email verification box ─────────────────────────────── */

.notice {
	margin: 0 0 1rem;
	padding: 0.6rem 1rem;
	background: #eff6ff;
	border: 1px solid #bfdbfe;
	border-radius: 10px;
}

.verify {
	display: flex;
	flex-wrap: wrap;
	gap: 0.75rem 1.25rem;
	align-items: center;
	justify-content: space-between;
	margin: 0 0 1.5rem;
	padding: 1rem 1.25rem;
	background: #fffbeb;
	border: 1px solid #fde68a;
	border-radius: 16px;
}

.verify p {
	flex: 1 1 20rem;
	margin: 0;
}