/* DoH Latency Tester — Professional UI */
:root {
	--font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
	--radius-xs: 4px;
	--radius-sm: 8px;
	--radius-md: 12px;
	--space-2xs: 0.25rem;
	--space-xs: 0.5rem;
	--space-sm: 0.75rem;
	--space-md: 1rem;
	--space-lg: 1.5rem;
	--space-xl: 2rem;
	--transition-fast: 0.15s;
	--transition: 0.3s;

	/* Light theme */
	--bg-body: #ffffff;
	--bg-card: #ffffff;
	--bg-input: #f8f9fa;
	--text-primary: #1f2937;
	--text-secondary: #6b7280;
	--border: #e5e7eb;
	--primary: #3b82f6;
	--primary-hover: #2563eb;
	--success: #10b981;
	--warning: #f59e0b;
	--error: #ef4444;
	--bar-bg: #f3f4f6;
}

@media (prefers-color-scheme: dark) {
	:root {
		--bg-body: #111827;
		--bg-card: #1f2937;
		--bg-input: #374151;
		--text-primary: #f9fafb;
		--text-secondary: #d1d5db;
		--border: #374151;
		--primary: #60a5fa;
		--primary-hover: #93c5fd;
		--success: #34d399;
		--warning: #fbbf24;
		--error: #f87171;
		--bar-bg: #4b5563;
	}
}

*,
*::before,
*::after {
	box-sizing: border-box;
}

body {
	margin: 0;
	font-family: var(--font-sans);
	background-color: var(--bg-body);
	color: var(--text-primary);
	line-height: 1.5;
	padding: var(--space-md);
	min-height: 100vh;
}

main {
	max-width: 880px;
	margin: 0 auto;
}

header {
	text-align: center;
	margin-bottom: var(--space-xl);
	padding-top: var(--space-lg);
}

h1 {
	font-weight: 700;
	font-size: 2.25rem;
	line-height: 1.2;
	letter-spacing: -0.02em;
	margin: 0;
	background: linear-gradient(135deg, var(--text-primary), #6b7280);
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
	background-clip: text;
}

header p {
	font-size: 1.125rem;
	color: var(--text-secondary);
	max-width: 600px;
	margin: var(--space-xs) auto 0;
}

.file-inputs {
	margin-bottom: var(--space-xl);
	display: grid;
	gap: var(--space-sm);
}

.file-inputs label {
	display: flex;
	flex-direction: column;
	gap: var(--space-2xs);
	font-size: 0.95rem;
	color: var(--text-secondary);
}

.file-inputs input[type='file'],
.file-inputs input[type='text'] {
	font-size: 1rem;
	padding: var(--space-xs) var(--space-sm);
	border: 1px solid var(--border);
	border-radius: var(--radius-sm);
	background: var(--bg-input);
	color: var(--text-primary);
	transition:
		border-color var(--transition-fast),
		box-shadow var(--transition-fast);
	width: 100%;
	height: 2.5rem;
	font-family: var(--font-sans);
}

.file-inputs input[type='text']::placeholder {
	color: #9ca3af;
}

.file-inputs input:focus {
	outline: none;
	border-color: var(--primary);
	box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.file-inputs input[type='file'] {
	cursor: pointer;
}
.file-inputs input[type='file']::-webkit-file-upload-button {
	background: var(--primary);
	color: white;
	border: none;
	padding: 0.375rem 0.75rem;
	margin: -0.375rem -0.75rem -0.375rem 0;
	border-radius: var(--radius-xs);
	cursor: pointer;
	font-size: 0.95rem;
	font-weight: 500;
	transition: background var(--transition-fast);
}
.file-inputs input[type='file']::-webkit-file-upload-button:hover {
	background: var(--primary-hover);
}

.controls {
	text-align: center;
	margin-bottom: var(--space-xl);
	position: relative;
}

.settings-btn {
	background: #6b7280;
	padding: 0.5rem 1rem;
	font-size: 0.95rem;
	display: inline-flex;
	align-items: center;
	gap: 0.5rem;
}
.settings-btn:hover:not(:disabled) {
	background: #4b5563;
	transform: none;
	box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.settings-btn .material-symbols-outlined {
	font-size: 1.2rem;
	font-variation-settings:
		'FILL' 0,
		'wght' 400,
		'GRAD' 0,
		'opsz' 24;
}

#settingsForm {
	margin-bottom: var(--space-lg);
}

button {
	padding: 0.75rem 1.5rem;
	font-size: 1rem;
	font-weight: 600;
	background: var(--primary);
	color: white;
	border: none;
	border-radius: var(--radius-md);
	cursor: pointer;
	transition:
		background var(--transition),
		transform var(--transition-fast);
	box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

button:hover:not(:disabled) {
	background: var(--primary-hover);
	transform: translateY(-1px);
	box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

button:active:not(:disabled) {
	transform: translateY(0);
}

button:disabled {
	background: #cbd5e1;
	cursor: not-allowed;
	transform: none;
	box-shadow: none;
}

#cancelBtn {
	background: #dc2626;
	margin-left: var(--space-sm);
}
#cancelBtn:hover:not(:disabled) {
	background: #b91c1c;
}

#exportBtn {
	margin-top: var(--space-md);
	background: #4b5563;
}
#exportBtn:hover:not(:disabled) {
	background: #6b7280;
}

.progress-group {
	margin: var(--space-lg) 0;
	max-width: 600px;
	margin-left: auto;
	margin-right: auto;
}

.progress-group progress {
	width: 100%;
	height: 8px;
	border-radius: 4px;
	overflow: hidden;
	border: none;
	background: var(--bar-bg);
}

.progress-group progress::-webkit-progress-bar {
	background: var(--bar-bg);
}
.progress-group progress::-webkit-progress-value {
	background: var(--primary);
	border-radius: 4px;
}

.progress-group div {
	font-size: 0.9rem;
	color: var(--text-secondary);
	margin-top: var(--space-2xs);
}

.status {
	margin-top: var(--space-sm);
	font-style: italic;
	color: var(--error);
	min-height: 1.5rem;
}

.results-list {
	list-style: none;
	padding: 0;
	margin: 0;
	background: var(--bg-card);
	border: 1px solid var(--border);
	border-radius: var(--radius-md);
	padding: var(--space-sm);
	max-height: 60vh;
	overflow-y: auto;
	box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.server-item {
	padding: var(--space-sm) 0;
	display: flex;
	flex-direction: column;
	gap: var(--space-2xs);
	border-bottom: 1px solid var(--border);
	transition: background var(--transition-fast);
}

.server-item:last-child {
	border-bottom: none;
}

.server-item:hover {
	background: rgba(59, 130, 246, 0.03);
	border-radius: var(--radius-xs);
}

.server-header {
	display: flex;
	justify-content: space-between;
	align-items: flex-start;
	gap: var(--space-md);
}

.server-url {
	font-family: 'SF Mono', 'Monaco', 'Inconsolata', monospace;
	font-size: 0.95rem;
	color: var(--text-secondary);
	word-break: break-all;
	flex: 1;
	line-height: 1.4;
}

.server-avg {
	font-weight: 700;
	font-size: 1.1rem;
	min-width: 6ch;
	text-align: right;
	white-space: nowrap;
	color: var(--text-primary);
}

.server-avg.error {
	color: var(--error);
	font-weight: 600;
}

.server-bar-container {
	position: relative;
	width: 100%;
	height: 6px;
	background: var(--bar-bg);
	border-radius: 3px;
	overflow: hidden;
}

.server-bar {
	position: absolute;
	left: 0;
	top: 0;
	height: 100%;
	border-radius: 3px;
	transition: width var(--transition) cubic-bezier(0.23, 1, 0.32, 1);
}

.server-bar.fast {
	background: var(--success);
}
.server-bar.medium {
	background: var(--warning);
}
.server-bar.slow {
	background: var(--error);
}
.server-bar.error {
	background: var(--error);
	opacity: 0.5;
}

.hidden {
	display: none !important;
}

/* Responsive */
@media (max-width: 600px) {
	h1 {
		font-size: 1.8rem;
	}
	.server-header {
		flex-direction: column;
		align-items: stretch;
		gap: var(--space-xs);
	}
	.server-avg {
		text-align: left;
	}
}