/**
 * Voice Analyzer - Main Stylesheet
 * Mobile-first responsive design with CSS variables
 */

:root {
	--vca-primary: #6366F1;
	--vca-primary-dark: #4F46E5;
	--vca-primary-light: #818CF8;
	--vca-accent: #EC4899;
	--vca-success: #10B981;
	--vca-warning: #F59E0B;
	--vca-error: #EF4444;
	--vca-neutral-50: #F9FAFB;
	--vca-neutral-100: #F3F4F6;
	--vca-neutral-200: #E5E7EB;
	--vca-neutral-300: #D1D5DB;
	--vca-neutral-400: #9CA3AF;
	--vca-neutral-500: #6B7280;
	--vca-neutral-600: #4B5563;
	--vca-neutral-700: #374151;
	--vca-neutral-800: #1F2937;
	--vca-neutral-900: #111827;

	--vca-radius: 8px;
	--vca-radius-lg: 12px;
	--vca-radius-xl: 16px;
	
	--vca-spacing-xs: 4px;
	--vca-spacing-sm: 8px;
	--vca-spacing-md: 16px;
	--vca-spacing-lg: 24px;
	--vca-spacing-xl: 32px;
	--vca-spacing-2xl: 48px;

	--vca-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
	--vca-shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
	--vca-shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
	--vca-shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);

	--vca-transition: all 0.2s ease-in-out;
	--vca-transition-slow: all 0.3s ease-in-out;

	--vca-font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
	--vca-font-size-base: 16px;
	--vca-font-size-sm: 14px;
	--vca-font-size-xs: 12px;
	--vca-font-size-lg: 18px;
	--vca-font-size-xl: 24px;
	--vca-font-size-2xl: 32px;

	--vca-line-height-tight: 1.4;
	--vca-line-height-normal: 1.6;
	--vca-line-height-relaxed: 1.8;

	--vca-control-height: 48px;
	--vca-control-padding-x: 16px;
	--vca-control-padding-y: 12px;
}

/* Reset & Base Styles */
.vca-container {
	font-family: var(--vca-font-family);
	font-size: var(--vca-font-size-base);
	line-height: var(--vca-line-height-normal);
	color: var(--vca-neutral-900);
	background: transparent;
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}

.vca-container * {
	box-sizing: border-box;
}

.vca-container *:focus {
	outline: 2px solid var(--vca-primary);
	outline-offset: 2px;
}

/* Header */
.vca-header {
	text-align: center;
	margin-bottom: var(--vca-spacing-2xl);
	padding: 0 var(--vca-spacing-md);
}

.vca-title {
	font-size: var(--vca-font-size-2xl);
	font-weight: 700;
	line-height: var(--vca-line-height-tight);
	color: var(--vca-neutral-900);
	margin: 0 0 var(--vca-spacing-sm) 0;
	letter-spacing: -0.5px;
}

.vca-subtitle {
	font-size: var(--vca-font-size-lg);
	color: var(--vca-neutral-500);
	margin: 0;
	line-height: var(--vca-line-height-normal);
	max-width: 600px;
	margin-left: auto;
	margin-right: auto;
}

/* Main Layout */
.vca-main {
	display: grid;
	gap: var(--vca-spacing-lg);
	padding: 0 var(--vca-spacing-md);
	max-width: 800px;
	margin: 0 auto;
}

/* Sections */
.vca-section {
	background: white;
	border: 1px solid var(--vca-neutral-200);
	border-radius: var(--vca-radius-lg);
	padding: var(--vca-spacing-lg);
	box-shadow: var(--vca-shadow-md);
	transition: var(--vca-transition);
}

.vca-section-title {
	font-size: var(--vca-font-size-lg);
	font-weight: 600;
	color: var(--vca-neutral-900);
	margin: 0 0 var(--vca-spacing-lg) 0;
	letter-spacing: -0.3px;
}

.vca-input-section {
	background: linear-gradient(135deg, #F9FAFB 0%, #F3F4F6 100%);
	border-color: var(--vca-neutral-200);
}

.vca-results-section {
	border: 2px solid var(--vca-primary);
	background: linear-gradient(135deg, rgba(99, 102, 241, 0.02) 0%, rgba(99, 102, 241, 0.01) 100%);
}

/* Form Groups */
.vca-form-group {
	display: flex;
	flex-direction: column;
	gap: var(--vca-spacing-sm);
	margin-bottom: var(--vca-spacing-md);
}

.vca-form-group:last-child {
	margin-bottom: 0;
}

.vca-label {
	font-size: var(--vca-font-size-sm);
	font-weight: 600;
	color: var(--vca-neutral-800);
	letter-spacing: 0.3px;
	text-transform: uppercase;
	display: block;
	margin-bottom: var(--vca-spacing-xs);
}

/* Input & Select Elements */
.vca-input,
.vca-select {
	width: 100%;
	height: var(--vca-control-height);
	padding: var(--vca-control-padding-y) var(--vca-control-padding-x);
	font-size: var(--vca-font-size-base);
	line-height: var(--vca-line-height-normal);
	border: 1px solid var(--vca-neutral-300);
	border-radius: var(--vca-radius);
	background: white;
	color: var(--vca-neutral-900);
	transition: var(--vca-transition);
	font-family: var(--vca-font-family);
	appearance: none;
}

.vca-input::placeholder {
	color: var(--vca-neutral-400);
}

.vca-input:hover,
.vca-select:hover {
	border-color: var(--vca-neutral-400);
	background: #FAFBFC;
}

.vca-input:focus,
.vca-select:focus {
	border-color: var(--vca-primary);
	background: white;
	box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
	outline: none;
}

.vca-input:disabled,
.vca-select:disabled {
	background: var(--vca-neutral-100);
	color: var(--vca-neutral-400);
	cursor: not-allowed;
	border-color: var(--vca-neutral-200);
}

.vca-select {
	background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236B7280' d='M1 4l5 4 5-4'/%3E%3C/svg%3E");
	background-repeat: no-repeat;
	background-position: right var(--vca-control-padding-x) center;
	padding-right: 36px;
}

.vca-select option {
	padding: var(--vca-control-padding-y);
	background: white;
	color: var(--vca-neutral-900);
	border: none;
}

/* Helper Text */
.vca-helper {
	font-size: var(--vca-font-size-xs);
	color: var(--vca-neutral-500);
	display: block;
	margin-top: var(--vca-spacing-xs);
}

.vca-error-message {
	font-size: var(--vca-font-size-sm);
	color: var(--vca-error);
	margin-top: var(--vca-spacing-xs);
	display: none;
}

.vca-form-group.vca-has-error .vca-error-message {
	display: block;
}

.vca-form-group.vca-has-error .vca-input,
.vca-form-group.vca-has-error .vca-select {
	border-color: var(--vca-error);
	background: rgba(239, 68, 68, 0.02);
}

/* Mode Section */
.vca-mode-section {
	animation: vca-fade-in 0.2s ease-in-out;
}

@keyframes vca-fade-in {
	from {
		opacity: 0;
	}
	to {
		opacity: 1;
	}
}

/* Buttons */
.vca-button-group {
	display: flex;
	gap: var(--vca-spacing-md);
	margin-top: var(--vca-spacing-lg);
	flex-wrap: wrap;
}

.vca-button {
	height: var(--vca-control-height);
	padding: var(--vca-control-padding-y) var(--vca-control-padding-x);
	font-size: var(--vca-font-size-base);
	font-weight: 600;
	border: none;
	border-radius: var(--vca-radius);
	cursor: pointer;
	transition: var(--vca-transition);
	display: inline-flex;
	align-items: center;
	justify-content: center;
	white-space: nowrap;
	letter-spacing: 0.3px;
	font-family: var(--vca-font-family);
	text-transform: uppercase;
	font-size: var(--vca-font-size-sm);
	gap: var(--vca-spacing-sm);
}

.vca-button:active {
	transform: scale(0.98);
}

.vca-button-primary {
	background: var(--vca-primary);
	color: white;
	flex: 1;
	min-width: 120px;
}

.vca-button-primary:hover {
	background: var(--vca-primary-dark);
	box-shadow: var(--vca-shadow-md);
}

.vca-button-primary:active {
	background: #4338CA;
}

.vca-button-primary:disabled {
	background: var(--vca-neutral-300);
	cursor: not-allowed;
	box-shadow: none;
}

.vca-button-secondary {
	background: white;
	color: var(--vca-neutral-700);
	border: 1px solid var(--vca-neutral-300);
	flex: 1;
	min-width: 120px;
}

.vca-button-secondary:hover {
	background: var(--vca-neutral-50);
	border-color: var(--vca-neutral-400);
}

.vca-button-secondary:active {
	background: var(--vca-neutral-100);
}

.vca-button-text {
	background: transparent;
	color: var(--vca-primary);
	padding: var(--vca-spacing-sm) var(--vca-spacing-md);
	height: auto;
	text-transform: none;
	font-weight: 500;
	font-size: var(--vca-font-size-sm);
}

.vca-button-text:hover {
	background: rgba(99, 102, 241, 0.08);
	color: var(--vca-primary-dark);
}

/* Results Container */
.vca-results-container {
	display: grid;
	gap: var(--vca-spacing-lg);
}

.vca-result-card {
	background: white;
	border: 1px solid var(--vca-neutral-200);
	border-radius: var(--vca-radius-lg);
	padding: var(--vca-spacing-lg);
	box-shadow: var(--vca-shadow-sm);
}

.vca-result-primary {
	background: linear-gradient(135deg, #6366F1 0%, #4F46E5 100%);
	color: white;
	border: none;
	text-align: center;
}

.vca-result-label {
	font-size: var(--vca-font-size-sm);
	font-weight: 600;
	text-transform: uppercase;
	letter-spacing: 0.5px;
	opacity: 0.9;
	margin-bottom: var(--vca-spacing-sm);
	display: block;
}

.vca-result-value {
	font-size: var(--vca-font-size-2xl);
	font-weight: 700;
	line-height: var(--vca-line-height-tight);
	letter-spacing: -0.5px;
	margin: 0;
	word-break: break-word;
}

.vca-result-secondary {
	font-size: var(--vca-font-size-sm);
	margin-top: var(--vca-spacing-md);
	opacity: 0.85;
}

/* Results Grid */
.vca-results-grid {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: var(--vca-spacing-md);
}

.vca-result-item {
	padding: var(--vca-spacing-md);
	background: var(--vca-neutral-50);
	border-radius: var(--vca-radius);
	border: 1px solid var(--vca-neutral-200);
}

.vca-result-item-label {
	font-size: var(--vca-font-size-xs);
	color: var(--vca-neutral-600);
	font-weight: 600;
	text-transform: uppercase;
	letter-spacing: 0.3px;
	margin-bottom: var(--vca-spacing-xs);
	display: block;
}

.vca-result-item-value {
	font-size: var(--vca-font-size-lg);
	font-weight: 700;
	color: var(--vca-neutral-900);
	word-break: break-word;
}

/* Result Actions */
.vca-result-actions {
	display: flex;
	gap: var(--vca-spacing-md);
	margin-top: var(--vca-spacing-lg);
}

.vca-copy-success {
	animation: vca-pulse 0.3s ease-out;
}

@keyframes vca-pulse {
	0% {
		box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
	}
	70% {
		box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
	}
	100% {
		box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
	}
}

/* History Section */
.vca-history-header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	margin-bottom: var(--vca-spacing-lg);
	gap: var(--vca-spacing-md);
}

.vca-history-list {
	display: flex;
	flex-direction: column;
	gap: var(--vca-spacing-sm);
}

.vca-history-item {
	background: var(--vca-neutral-50);
	border: 1px solid var(--vca-neutral-200);
	border-radius: var(--vca-radius);
	padding: var(--vca-spacing-md);
	display: flex;
	justify-content: space-between;
	align-items: center;
	cursor: pointer;
	transition: var(--vca-transition);
}

.vca-history-item:hover {
	background: white;
	border-color: var(--vca-primary);
	box-shadow: var(--vca-shadow-sm);
}

.vca-history-content {
	flex: 1;
}

.vca-history-note {
	font-size: var(--vca-font-size-sm);
	color: var(--vca-neutral-900);
	font-weight: 600;
	margin-bottom: var(--vca-spacing-xs);
}

.vca-history-time {
	font-size: var(--vca-font-size-xs);
	color: var(--vca-neutral-500);
}

.vca-history-remove {
	background: transparent;
	border: none;
	color: var(--vca-error);
	cursor: pointer;
	font-size: var(--vca-font-size-sm);
	padding: var(--vca-spacing-xs) var(--vca-spacing-sm);
	transition: var(--vca-transition);
	height: auto;
	text-transform: none;
	width: auto;
}

.vca-history-remove:hover {
	color: #DC2626;
	background: rgba(239, 68, 68, 0.1);
}

.vca-empty-state {
	text-align: center;
	color: var(--vca-neutral-400);
	font-size: var(--vca-font-size-sm);
	padding: var(--vca-spacing-lg) var(--vca-spacing-md);
	margin: 0;
}

/* Loading State */
.vca-loading {
	position: relative;
	pointer-events: none;
	opacity: 0.6;
}

.vca-spinner {
	display: inline-block;
	width: 16px;
	height: 16px;
	border: 2px solid rgba(99, 102, 241, 0.2);
	border-top-color: var(--vca-primary);
	border-radius: 50%;
	animation: vca-spin 0.6s linear infinite;
}

@keyframes vca-spin {
	to {
		transform: rotate(360deg);
	}
}

/* Responsive Design */
@media (max-width: 640px) {
	:root {
		--vca-font-size-base: 16px;
		--vca-spacing-lg: 16px;
		--vca-spacing-xl: 24px;
		--vca-spacing-2xl: 32px;
	}

	.vca-header {
		margin-bottom: var(--vca-spacing-xl);
		padding: 0 var(--vca-spacing-sm);
	}

	.vca-title {
		font-size: var(--vca-font-size-xl);
	}

	.vca-subtitle {
		font-size: var(--vca-font-size-base);
	}

	.vca-main {
		padding: 0 var(--vca-spacing-sm);
		gap: var(--vca-spacing-md);
	}

	.vca-section {
		padding: var(--vca-spacing-md);
		border-radius: var(--vca-radius-lg);
	}

	.vca-button-group {
		flex-direction: column;
		gap: var(--vca-spacing-sm);
	}

	.vca-button {
		width: 100%;
	}

	.vca-results-grid {
		grid-template-columns: 1fr;
		gap: var(--vca-spacing-sm);
	}

	.vca-history-item {
		flex-direction: column;
		align-items: flex-start;
		gap: var(--vca-spacing-sm);
	}

	.vca-history-remove {
		align-self: flex-end;
		margin-top: var(--vca-spacing-sm);
	}

	.vca-result-value {
		font-size: var(--vca-font-size-xl);
	}
}

@media (max-width: 480px) {
	:root {
		--vca-control-height: 44px;
		--vca-control-padding-x: 12px;
		--vca-spacing-md: 12px;
	}

	.vca-title {
		font-size: var(--vca-font-size-lg);
	}

	.vca-result-value {
		font-size: var(--vca-font-size-xl);
	}
}

/* Accessibility */
.vca-sr-only {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border: 0;
}

/* Toolbar */
.vca-toolbar {
	display: flex;
	justify-content: space-between;
	align-items: center;
	padding: 0 var(--vca-spacing-md);
	margin-bottom: var(--vca-spacing-lg);
	max-width: 800px;
	margin-left: auto;
	margin-right: auto;
}

.vca-toolbar-btn {
	background: transparent;
	border: 1px solid var(--vca-neutral-300);
	width: 40px;
	height: 40px;
	border-radius: var(--vca-radius);
	cursor: pointer;
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 18px;
	transition: var(--vca-transition);
}

.vca-toolbar-btn:hover {
	background: var(--vca-neutral-50);
	border-color: var(--vca-neutral-400);
}

/* Harmonics List */
.vca-harmonics-list {
	display: grid;
	gap: var(--vca-spacing-sm);
}

.vca-harmonic-row {
	display: grid;
	grid-template-columns: 30px 1fr 60px 80px;
	gap: var(--vca-spacing-md);
	padding: var(--vca-spacing-md);
	background: var(--vca-neutral-50);
	border-radius: var(--vca-radius);
	border: 1px solid var(--vca-neutral-200);
	font-size: var(--vca-font-size-sm);
	align-items: center;
}

.vca-harmonic-num {
	font-weight: 700;
	color: var(--vca-primary);
	text-align: center;
}

.vca-harmonic-freq {
	color: var(--vca-neutral-700);
	font-weight: 600;
}

.vca-harmonic-note {
	background: var(--vca-primary-light);
	color: white;
	padding: 4px 8px;
	border-radius: 4px;
	text-align: center;
	font-weight: 600;
}

.vca-harmonic-cents {
	color: var(--vca-neutral-600);
	font-size: var(--vca-font-size-xs);
	text-align: center;
}

/* Exercise Cards */
.vca-exercise-card {
	background: var(--vca-neutral-50);
	border: 1px solid var(--vca-neutral-200);
	border-radius: var(--vca-radius-lg);
	padding: var(--vca-spacing-md);
	margin-bottom: var(--vca-spacing-md);
	transition: var(--vca-transition);
}

.vca-exercise-card:hover {
	border-color: var(--vca-primary);
	background: white;
	box-shadow: var(--vca-shadow-sm);
}

/* Health Section */
.vca-health-section {
	background: linear-gradient(135deg, rgba(16, 185, 129, 0.02) 0%, rgba(16, 185, 129, 0.01) 100%);
	border-color: var(--vca-success);
}

.vca-health-status {
	animation: vca-fade-in 0.3s ease-out;
}

/* Visualization Section */
.vca-visualization-section {
	background: linear-gradient(135deg, rgba(59, 130, 246, 0.02) 0%, rgba(59, 130, 246, 0.01) 100%);
	border-color: #3B82F6;
}

/* Exercises Section */
.vca-exercises-section {
	background: linear-gradient(135deg, rgba(245, 158, 11, 0.02) 0%, rgba(245, 158, 11, 0.01) 100%);
	border-color: var(--vca-warning);
}

/* Dark Mode */
body.vca-dark-mode {
	--vca-neutral-50: #1A1A2E;
	--vca-neutral-100: #16213E;
	--vca-neutral-200: #0F3460;
	--vca-neutral-300: #1A3D5C;
	--vca-neutral-400: #5A6A7A;
	--vca-neutral-500: #7A8A9A;
	--vca-neutral-600: #9AAAAA;
	--vca-neutral-700: #C0CCCC;
	--vca-neutral-800: #D0DDDD;
	--vca-neutral-900: #EEEEEE;

	background: #0F1419;
	color: #EEEEEE;
}

body.vca-dark-mode .vca-section {
	background: #16213E;
	border-color: #0F3460;
}

body.vca-dark-mode .vca-input-section {
	background: linear-gradient(135deg, #1A2332 0%, #162135 100%);
}

body.vca-dark-mode .vca-results-section {
	background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(99, 102, 241, 0.08) 100%);
}

body.vca-dark-mode .vca-input,
body.vca-dark-mode .vca-select {
	background: #0F3460;
	border-color: #1A3D5C;
	color: #EEEEEE;
}

body.vca-dark-mode .vca-input::placeholder {
	color: #7A8A9A;
}

body.vca-dark-mode .vca-input:hover,
body.vca-dark-mode .vca-select:hover {
	background: #1A3D5C;
	border-color: #3A5D8C;
}

body.vca-dark-mode .vca-label {
	color: #C0CCCC;
}

body.vca-dark-mode .vca-button-secondary {
	background: #0F3460;
	color: #C0CCCC;
	border-color: #1A3D5C;
}

body.vca-dark-mode .vca-button-secondary:hover {
	background: #1A3D5C;
	border-color: #3A5D8C;
}

body.vca-dark-mode .vca-result-item {
	background: #0F3460;
	border-color: #1A3D5C;
}

body.vca-dark-mode .vca-history-item {
	background: #0F3460;
	border-color: #1A3D5C;
}

body.vca-dark-mode .vca-history-item:hover {
	background: #16213E;
	border-color: #6366F1;
}

body.vca-dark-mode .vca-harmonic-row {
	background: #0F3460;
	border-color: #1A3D5C;
}

body.vca-dark-mode .vca-exercise-card {
	background: #0F3460;
	border-color: #1A3D5C;
}

body.vca-dark-mode .vca-exercise-card:hover {
	background: #16213E;
	border-color: #6366F1;
}

/* Print Styles */
@media print {
	.vca-input-section,
	.vca-button-group,
	.vca-history-section,
	.vca-toolbar,
	.vca-health-section,
	.vca-exercises-section,
	.vca-visualization-section {
		display: none;
	}

	.vca-results-section {
		border: 1px solid #ccc;
		box-shadow: none;
	}

	.vca-button {
		display: none;
	}
}