/* Header Left */
.header-left {
	display: flex;
	align-items: center;
	gap: 12px;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
	display: none;
	width: 40px;
	height: 40px;
	border-radius: 8px;
	border: none;
	background-color: var(--surface-hover);
	color: var(--text-primary);
	cursor: pointer;
	align-items: center;
	justify-content: center;
	transition: var(--transition);
}

.mobile-menu-toggle:hover {
	background-color: var(--border);
}

@media (max-width: 768px) {
	.mobile-menu-toggle {
		display: flex;
	}
}

/* Language Select */
.language-select {
	height: 40px;
	padding: 0 12px;
	border-radius: 8px;
	border: 1px solid var(--border);
	background-color: var(--surface-hover);
	color: var(--text-primary);
	font-size: 14px;
	font-weight: 500;
	cursor: pointer;
	outline: none;
	transition: var(--transition);
	margin-right: 8px;
}

.language-select:hover {
	background-color: var(--border);
}

.language-select:focus {
	border-color: var(--primary-color);
	box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Theme Toggle Button */
.theme-toggle {
	width: 40px;
	height: 40px;
	border-radius: 8px;
	border: none;
	background-color: var(--surface-hover);
	color: var(--text-primary);
	cursor: pointer;
	display: flex;
	align-items: center;
	justify-content: center;
	transition: var(--transition);
}

.theme-toggle:hover {
	background-color: var(--border);
}

.theme-toggle .sun-icon,
.theme-toggle .moon-icon {
	transition: var(--transition);
}

[data-theme="light"] .moon-icon {
	display: none;
}

[data-theme="dark"] .sun-icon {
	display: none;
}

/* Search Input */
.search-input {
	width: 100%;
	padding: 10px 16px;
	border: 1px solid var(--border);
	border-radius: 8px;
	background-color: var(--background);
	color: var(--text-primary);
	font-size: 14px;
	outline: none;
	transition: var(--transition);
}

.search-input:focus {
	border-color: var(--primary-color);
	box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.search-input::placeholder {
	color: var(--text-secondary);
}

/* Tool List */
.tool-list {
	padding: 12px 0;
}

.tool-category {
	margin-bottom: 20px;
}

.category-title {
	font-size: 11px;
	font-weight: 700;
	text-transform: uppercase;
	color: var(--text-secondary);
	padding: 8px 16px;
	margin-bottom: 2px;
	margin-top: 8px;
	letter-spacing: 0.8px;
	cursor: pointer;
	display: flex;
	align-items: center;
	justify-content: space-between;
	transition: all 0.2s ease;
	outline: none;
	border-radius: 6px;
	user-select: none;
	background-color: var(--bg-secondary);
	border-bottom: 1px solid var(--border);
}

.category-title:hover {
	background-color: var(--surface);
	color: var(--primary-color);
}

.category-title:hover .category-arrow {
	color: var(--primary-color);
}

.category-title:focus {
	background-color: var(--surface);
	outline: 2px solid var(--primary-color);
	outline-offset: -2px;
}

.category-title:active {
	transform: scale(0.99);
}

.category-arrow {
	transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), color 0.2s ease;
	flex-shrink: 0;
	color: var(--text-secondary);
	width: 16px;
	height: 16px;
	opacity: 0.7;
}

.category-title:hover .category-arrow {
	opacity: 1;
}

.category-title[aria-expanded="false"] .category-arrow {
	transform: rotate(-90deg);
}

.category-items {
	max-height: 1000px;
	overflow: hidden;
	transition: max-height 0.3s ease, opacity 0.3s ease;
}

.tool-category[aria-hidden="true"] .category-items {
	max-height: 0;
	opacity: 0;
}

.tool-item {
	display: flex;
	align-items: center;
	padding: 8px 16px;
	margin-left: 4px;
	color: var(--text-primary);
	text-decoration: none;
	transition: var(--transition);
	cursor: pointer;
	position: relative;
	border-radius: 4px;
}

.tool-item:hover {
	background-color: var(--surface-hover);
}

.tool-item.active {
	background-color: var(--surface-hover);
	border-left: 3px solid var(--primary-color);
	padding-left: 13px;
}

.tool-icon {
	font-size: 20px;
	margin-right: 12px;
	flex-shrink: 0;
}

.tool-name {
	flex: 1;
	font-size: 14px;
	font-weight: 500;
	white-space: nowrap;
	overflow: hidden;
	text-overflow: ellipsis;
}

/* Sections */
.input-section,
.output-section {
	background-color: var(--surface);
	border: 1px solid var(--border);
	border-radius: 12px;
	padding: 20px;
	box-shadow: var(--shadow-sm);
}

.section-header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	margin-bottom: 16px;
}

.section-header label {
	font-size: 14px;
	font-weight: 600;
	color: var(--text-primary);
}

/* Output size indicator */
.output-size {
	font-size: 12px;
	color: var(--text-secondary);
	margin-left: 8px;
	font-weight: 400;
}

.output-size .size-bytes {
	font-weight: 600;
	color: var(--primary-color);
}

.output-size .compression-ratio {
	color: var(--success);
	font-weight: 600;
}

/* Auto-run toggle */
.auto-run-toggle {
	display: flex;
	align-items: center;
	gap: 8px;
	font-size: 13px;
	color: var(--text-secondary);
	margin-left: 16px;
}

.toggle-switch {
	position: relative;
	display: inline-block;
	width: 44px;
	height: 24px;
}

.toggle-switch input {
	opacity: 0;
	width: 0;
	height: 0;
}

.toggle-slider {
	position: absolute;
	cursor: pointer;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	background-color: var(--border);
	transition: var(--transition);
	border-radius: 24px;
}

.toggle-slider:before {
	position: absolute;
	content: "";
	height: 18px;
	width: 18px;
	left: 3px;
	bottom: 3px;
	background-color: white;
	transition: var(--transition);
	border-radius: 50%;
}

.toggle-switch input:checked + .toggle-slider {
	background-color: var(--primary-color);
}

.toggle-switch input:checked + .toggle-slider:before {
	transform: translateX(20px);
}

.toggle-switch input:focus + .toggle-slider {
	box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Form Controls */
.input-area,
.output-area {
	width: 100%;
	min-height: 200px;
	padding: 16px;
	border: 1px solid var(--border);
	border-radius: 8px;
	background-color: var(--background);
	color: var(--text-primary);
	font-family: 'Monaco', 'Menlo', 'Courier New', monospace;
	font-size: 14px;
	line-height: 1.5;
	resize: vertical;
	outline: none;
	transition: var(--transition);
}

.input-area:focus {
	border-color: var(--primary-color);
	box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.input-area.drag-over {
	border-color: var(--primary-color);
	background-color: rgba(59, 130, 246, 0.05);
	box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.input-area.drag-over::before {
	content: '📁 파일을 여기에 드롭하세요';
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	font-size: 16px;
	font-weight: 600;
	color: var(--primary-color);
	pointer-events: none;
	z-index: 10;
	background-color: var(--surface);
	padding: 12px 24px;
	border-radius: 8px;
	box-shadow: var(--shadow-md);
}

.output-area {
	background-color: var(--surface-hover);
}

.control-group {
	display: flex;
	gap: 16px;
	flex-wrap: wrap;
	align-items: flex-end;
}

.control-item {
	display: flex;
	flex-direction: column;
	gap: 8px;
}

.control-item label {
	font-size: 14px;
	font-weight: 500;
	color: var(--text-primary);
}

.select-input,
.number-input,
.color-input {
	padding: 10px 14px;
	border: 1px solid var(--border);
	border-radius: 8px;
	background-color: var(--background);
	color: var(--text-primary);
	font-size: 14px;
	outline: none;
	transition: var(--transition);
}

.select-input:focus,
.number-input:focus {
	border-color: var(--primary-color);
	box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.color-input {
	height: 42px;
	cursor: pointer;
}

.number-input {
	width: 100px;
}

/* Buttons */
.button-group {
	display: flex;
	gap: 8px;
}

.btn {
	padding: 10px 20px;
	border: none;
	border-radius: 8px;
	font-size: 14px;
	font-weight: 500;
	cursor: pointer;
	transition: var(--transition);
	display: inline-flex;
	align-items: center;
	gap: 8px;
	white-space: nowrap;
	position: relative;
	overflow: hidden;
}

/* Ripple effect for buttons */
.btn::after {
	content: '';
	position: absolute;
	top: 50%;
	left: 50%;
	width: 0;
	height: 0;
	border-radius: 50%;
	background: rgba(255, 255, 255, 0.5);
	transform: translate(-50%, -50%);
	transition: width 0.6s, height 0.6s;
}

.btn:active::after {
	width: 300px;
	height: 300px;
}

.btn-primary {
	background-color: var(--primary-color);
	color: white;
}

.btn-primary:hover {
	background-color: var(--primary-hover);
	box-shadow: var(--shadow-md);
}

.btn-secondary {
	background-color: var(--surface-hover);
	color: var(--text-primary);
	border: 1px solid var(--border);
}

.btn-secondary:hover {
	background-color: var(--border);
}

.btn-sample {
	background-color: #10b981;
	color: white;
	border: none;
}

.btn-sample:hover {
	background-color: #059669;
	box-shadow: var(--shadow-md);
}

.btn-copy {
	background-color: var(--surface-hover);
	color: var(--text-primary);
}

.btn-copy:hover {
	background-color: var(--border);
}

.btn-copy.copied {
	background-color: var(--success);
	color: white;
	animation: copySuccess 0.5s ease;
}

@keyframes copySuccess {
	0% {
		transform: scale(1);
	}
	50% {
		transform: scale(1.05);
	}
	100% {
		transform: scale(1);
	}
}

.btn-copy .copy-icon {
	display: inline;
}

.btn-copy .check-icon {
	display: none;
}

.btn-copy.copied .copy-icon {
	display: none;
}

.btn-copy.copied .check-icon {
	display: inline;
}

.btn svg {
	flex-shrink: 0;
}

/* Color Palette */
.color-palette {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
	gap: 16px;
}

.color-card {
	background-color: var(--surface);
	border: 1px solid var(--border);
	border-radius: 8px;
	overflow: hidden;
	box-shadow: var(--shadow-sm);
	transition: var(--transition);
}

.color-card:hover {
	box-shadow: var(--shadow-md);
	transform: translateY(-2px);
}

.color-preview {
	width: 100%;
	height: 100px;
	cursor: pointer;
}

.color-info {
	padding: 12px;
}

.color-value {
	font-family: 'Monaco', 'Menlo', 'Courier New', monospace;
	font-size: 13px;
	color: var(--text-primary);
	margin-bottom: 4px;
	cursor: pointer;
	transition: var(--transition);
}

.color-value:hover {
	color: var(--primary-color);
}

.color-rgb {
	font-size: 12px;
	color: var(--text-secondary);
	font-family: 'Monaco', 'Menlo', 'Courier New', monospace;
	cursor: pointer;
}

/* Toast Notification */
.toast {
	position: fixed;
	bottom: 24px;
	right: 24px;
	padding: 16px 24px;
	background-color: var(--text-primary);
	color: var(--background);
	border-radius: 12px;
	box-shadow: var(--shadow-lg);
	font-size: 14px;
	font-weight: 500;
	opacity: 0;
	transform: translateY(20px);
	transition: var(--transition);
	pointer-events: none;
	z-index: 1000;
	display: flex;
	align-items: center;
	gap: 12px;
	max-width: 400px;
}

.toast.show {
	opacity: 1;
	transform: translateY(0);
	pointer-events: auto;
}

.toast.success {
	background-color: var(--success);
	color: white;
}

.toast.error {
	background-color: var(--error);
	color: white;
}

.toast.warning {
	background-color: var(--warning);
	color: white;
}

.toast-icon {
	font-size: 20px;
	flex-shrink: 0;
}

/* Loading Spinner */
.loading-spinner {
	display: inline-block;
	width: 20px;
	height: 20px;
	border: 3px solid rgba(255, 255, 255, 0.3);
	border-radius: 50%;
	border-top-color: white;
	animation: spinner 0.8s linear infinite;
}

@keyframes spinner {
	to { transform: rotate(360deg); }
}

.loading-overlay {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	background-color: rgba(0, 0, 0, 0.5);
	display: flex;
	align-items: center;
	justify-content: center;
	z-index: 2000;
	opacity: 0;
	pointer-events: none;
	transition: opacity 0.3s ease;
}

.loading-overlay.show {
	opacity: 1;
	pointer-events: auto;
}

.loading-content {
	background-color: var(--surface);
	padding: 32px;
	border-radius: 16px;
	box-shadow: var(--shadow-lg);
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 16px;
}

.loading-spinner-large {
	width: 48px;
	height: 48px;
	border: 4px solid var(--border);
	border-radius: 50%;
	border-top-color: var(--primary-color);
	animation: spinner 0.8s linear infinite;
}

.loading-text {
	color: var(--text-primary);
	font-size: 14px;
	font-weight: 500;
}

/* Footer */
.footer {
	background-color: var(--surface);
	border-top: 1px solid var(--border);
	padding: 24px;
	text-align: center;
	margin-top: auto;
}

.footer-content {
	max-width: 1200px;
	margin: 0 auto;
}

.footer-text {
	color: var(--text-secondary);
	font-size: 14px;
}

.footer-link {
	color: var(--primary-color);
	text-decoration: none;
	font-weight: 500;
	transition: opacity 0.3s ease;
}

.footer-link:hover {
	opacity: 0.8;
	text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
	.control-group {
		flex-direction: column;
		align-items: stretch;
	}

	.control-item {
		width: 100%;
	}

	.number-input {
		width: 100%;
	}

	.color-palette {
		grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
	}
}

@media (max-width: 480px) {
	.section-header {
		flex-direction: column;
		align-items: flex-start;
		gap: 12px;
	}

	.button-group {
		width: 100%;
		flex-wrap: wrap;
	}

	.btn {
		flex: 1;
		justify-content: center;
	}
}

/* =================================
   Special Characters Tool Styles
   ================================= */
.char-category {
	margin-bottom: 2.5rem;
}

.char-category-title {
	font-size: 1.1rem;
	font-weight: 600;
	color: var(--text);
	margin-bottom: 1rem;
	padding-bottom: 0.5rem;
	border-bottom: 2px solid var(--primary);
}

.char-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
	gap: 0.75rem;
}

.char-item {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	padding: 0.75rem;
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: 8px;
	cursor: pointer;
	transition: all 0.2s ease;
}

.char-item:hover {
	background: var(--surface-hover);
	border-color: var(--primary);
	transform: translateY(-2px);
	box-shadow: 0 4px 12px rgba(59, 130, 246, 0.15);
}

.char-display {
	font-size: 1.5rem;
	min-width: 2rem;
	text-align: center;
	color: var(--primary);
}

.char-info {
	flex: 1;
	min-width: 0;
}

.char-name {
	font-size: 0.85rem;
	font-weight: 500;
	color: var(--text);
	margin-bottom: 0.25rem;
}

.char-code {
	font-size: 0.75rem;
	font-family: 'Courier New', monospace;
	color: var(--text-secondary);
}

/* =================================
   Password Generator Styles
   ================================= */
.strength-preset-btn {
	padding: 0.5rem 0.75rem;
	border: 1px solid var(--border);
	border-radius: 6px;
	background: var(--surface-hover);
	color: var(--text-secondary);
	font-size: 0.85rem;
	font-weight: 500;
	cursor: pointer;
	transition: all 0.2s;
}

.strength-preset-btn:hover {
	background: var(--bg);
	border-color: var(--primary-color);
}

.strength-preset-btn.active {
	background: var(--primary-color);
	color: white;
	border-color: var(--primary-color);
}

.password-strength {
	padding: 0.35rem 0.75rem;
	border-radius: 4px;
	font-size: 0.85rem;
	font-weight: 600;
	text-transform: uppercase;
}

.password-strength.weak {
	background: rgba(239, 68, 68, 0.1);
	color: #ef4444;
}

.password-strength.medium {
	background: rgba(251, 191, 36, 0.1);
	color: #fbbf24;
}

.password-strength.strong {
	background: rgba(34, 197, 94, 0.1);
	color: #22c55e;
}

.password-strength.very-strong {
	background: rgba(59, 130, 246, 0.1);
	color: #3b82f6;
}

/* =================================
   Timestamp Converter Styles
   ================================= */
.timestamp-tabs {
	display: flex;
	gap: 0.5rem;
	margin-bottom: 1.5rem;
	border-bottom: 2px solid var(--border);
}

.timestamp-tab {
	padding: 0.75rem 1.5rem;
	border: none;
	background: transparent;
	color: var(--text-secondary);
	font-size: 0.95rem;
	font-weight: 500;
	cursor: pointer;
	border-bottom: 2px solid transparent;
	margin-bottom: -2px;
	transition: all 0.2s;
}

.timestamp-tab:hover {
	color: var(--text-primary);
	background: var(--surface-hover);
}

.timestamp-tab.active {
	color: var(--primary-color);
	border-bottom-color: var(--primary-color);
}

.timestamp-input-card {
	background: var(--surface-hover);
	border-radius: 8px;
	padding: 1.5rem;
	margin-bottom: 1rem;
}

.timestamp-result-card {
	background: var(--surface-hover);
	border-radius: 8px;
	padding: 1rem;
	margin-bottom: 0.75rem;
	border: 1px solid var(--border);
	transition: all 0.2s;
}

.timestamp-result-card:hover {
	border-color: var(--primary-color);
	box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.timestamp-result-label {
	font-size: 0.85rem;
	font-weight: 600;
	color: var(--text-secondary);
	margin-bottom: 0.5rem;
	text-transform: uppercase;
	letter-spacing: 0.5px;
}

.timestamp-result-value {
	font-family: 'Courier New', monospace;
	font-size: 1rem;
	color: var(--text-primary);
	padding: 0.75rem;
	background: var(--bg);
	border-radius: 6px;
	border: 1px solid var(--border);
	display: flex;
	justify-content: space-between;
	align-items: center;
}

.timestamp-datetime-input {
	width: 100%;
	padding: 0.75rem;
	border: 1px solid var(--border);
	border-radius: 6px;
	background: var(--bg);
	color: var(--text-primary);
	font-size: 1rem;
}

/* =================================
   Diff Checker Styles
   ================================= */
.diff-stats {
	display: flex;
	gap: 1rem;
	align-items: center;
}

.stat-item {
	padding: 0.35rem 0.75rem;
	border-radius: 4px;
	font-size: 0.85rem;
	font-weight: 600;
}

.stat-added {
	background: rgba(34, 197, 94, 0.1);
	color: #22c55e;
}

.stat-removed {
	background: rgba(239, 68, 68, 0.1);
	color: #ef4444;
}

.stat-unchanged {
	background: rgba(156, 163, 175, 0.1);
	color: #9ca3af;
}

.diff-result {
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: 8px;
	padding: 1rem;
}

.diff-line {
	display: grid;
	grid-template-columns: 60px 60px 1fr;
	gap: 1rem;
	padding: 0.5rem;
	font-family: 'Courier New', monospace;
	font-size: 0.9em;
	line-height: 1.5;
}

.diff-line .line-num {
	text-align: right;
	color: var(--text-secondary);
	user-select: none;
}

.diff-line .line-content {
	white-space: pre-wrap;
	word-break: break-all;
}

.diff-unchanged {
	background: transparent;
}

.diff-added {
	background: rgba(34, 197, 94, 0.1);
	border-left: 3px solid #22c55e;
}

.diff-added .line-content {
	color: #22c55e;
}

.diff-removed {
	background: rgba(239, 68, 68, 0.1);
	border-left: 3px solid #ef4444;
}

.diff-removed .line-content {
	color: #ef4444;
}

/* =================================
   Responsive Styles for New Tools
   ================================= */
@media (max-width: 768px) {
	.char-grid {
		grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
		gap: 0.5rem;
	}

	.char-item {
		padding: 0.5rem;
	}

	.char-display {
		font-size: 1.25rem;
	}

	.diff-line {
		grid-template-columns: 50px 50px 1fr;
		gap: 0.5rem;
		font-size: 0.8em;
	}

	.diff-stats {
		flex-wrap: wrap;
		gap: 0.5rem;
	}
}

@media (max-width: 480px) {
	.char-grid {
		grid-template-columns: 1fr;
	}

	.diff-line {
		grid-template-columns: 40px 40px 1fr;
		gap: 0.25rem;
		padding: 0.35rem;
		font-size: 0.75em;
	}
}

/* =================================
   Number Base Converter Styles
   ================================= */
.base-converter-card {
	background: var(--surface);
	border: 2px solid var(--border);
	border-radius: 12px;
	padding: 1.25rem;
	transition: all 0.3s ease;
	position: relative;
}

.base-converter-card:hover {
	border-color: var(--primary-color);
	box-shadow: 0 4px 20px rgba(59, 130, 246, 0.15);
	transform: translateY(-2px);
}

.base-converter-card.error {
	border-color: var(--error);
	animation: shake 0.3s ease;
}

@keyframes shake {
	0%, 100% { transform: translateX(0); }
	25% { transform: translateX(-5px); }
	75% { transform: translateX(5px); }
}

.base-converter-card[data-base="binary"] {
	border-left: 4px solid #3b82f6;
}

.base-converter-card[data-base="octal"] {
	border-left: 4px solid #10b981;
}

.base-converter-card[data-base="decimal"] {
	border-left: 4px solid #f59e0b;
}

.base-converter-card[data-base="hexadecimal"] {
	border-left: 4px solid #ef4444;
}

.base-converter-header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	margin-bottom: 1rem;
}

.base-converter-title {
	display: flex;
	align-items: center;
	gap: 0.75rem;
}

.base-converter-title label {
	font-size: 1rem;
	font-weight: 600;
	color: var(--text-primary);
	margin: 0;
	display: block;
}

.base-converter-title small {
	font-size: 0.75rem;
	color: var(--text-secondary);
	display: block;
	margin-top: 0.25rem;
	font-weight: 400;
}

.base-icon {
	display: flex;
	align-items: center;
	justify-content: center;
	width: 40px;
	height: 40px;
	border-radius: 8px;
	font-size: 1.25rem;
	font-weight: 700;
	color: white;
	flex-shrink: 0;
}

.base-converter-card[data-base="binary"] .base-icon {
	background: linear-gradient(135deg, #3b82f6, #2563eb);
}

.base-converter-card[data-base="octal"] .base-icon {
	background: linear-gradient(135deg, #10b981, #059669);
}

.base-converter-card[data-base="decimal"] .base-icon {
	background: linear-gradient(135deg, #f59e0b, #d97706);
}

.base-converter-card[data-base="hexadecimal"] .base-icon {
	background: linear-gradient(135deg, #ef4444, #dc2626);
}

.base-converter-input {
	width: 100%;
	padding: 0.875rem 1rem;
	border: 2px solid var(--border);
	border-radius: 8px;
	background-color: var(--background);
	color: var(--text-primary);
	font-family: 'Monaco', 'Menlo', 'Courier New', monospace;
	font-size: 1.125rem;
	font-weight: 500;
	letter-spacing: 0.5px;
	outline: none;
	transition: all 0.2s ease;
}

.base-converter-input:focus {
	border-color: var(--primary-color);
	background-color: var(--surface);
	box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.base-converter-input.error {
	border-color: var(--error);
	background-color: rgba(239, 68, 68, 0.05);
}

.base-converter-input.error:focus {
	box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.1);
}

.base-converter-error {
	min-height: 20px;
	margin-top: 0.5rem;
	font-size: 0.8rem;
	color: var(--error);
	font-weight: 500;
	display: flex;
	align-items: center;
	gap: 0.375rem;
	opacity: 0;
	transform: translateY(-5px);
	transition: all 0.2s ease;
}

.base-converter-error.show {
	opacity: 1;
	transform: translateY(0);
}

.base-converter-error::before {
	content: "⚠";
	font-size: 1rem;
}

.btn-icon {
	width: 36px;
	height: 36px;
	padding: 0;
	display: flex;
	align-items: center;
	justify-content: center;
	background-color: var(--surface-hover);
	border: 1px solid var(--border);
	border-radius: 6px;
	cursor: pointer;
	transition: all 0.2s ease;
}

.btn-icon:hover {
	background-color: var(--primary-color);
	border-color: var(--primary-color);
	color: white;
	transform: scale(1.05);
}

.btn-icon svg {
	width: 16px;
	height: 16px;
}

.base-converter-info {
	margin-top: 1.5rem;
	padding: 1rem;
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: 8px;
}

.info-item {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	color: var(--text-secondary);
	font-size: 0.875rem;
}

.info-item svg {
	flex-shrink: 0;
	color: var(--primary-color);
}

/* Responsive Styles */
@media (max-width: 768px) {
	.base-converter-card {
		padding: 1rem;
	}

	.base-icon {
		width: 36px;
		height: 36px;
		font-size: 1rem;
	}

	.base-converter-input {
		font-size: 1rem;
		padding: 0.75rem;
	}
}

@media (max-width: 480px) {
	.base-converter-title {
		flex-direction: column;
		align-items: flex-start;
		gap: 0.5rem;
	}

	.base-converter-header {
		flex-direction: column;
		align-items: flex-start;
		gap: 0.75rem;
	}

	.btn-icon {
		align-self: flex-end;
	}
}

/* =================================
   Web Accessibility Tools Styles
   ================================= */

/* WCAG Contrast Checker */
.contrast-result-container,
.colorblind-result-container,
.aria-result-container {
	margin-top: 1rem;
}

.contrast-preview {
	margin-bottom: 2rem;
}

.preview-box {
	padding: 3rem 2rem;
	border-radius: 12px;
	border: 2px solid var(--border);
	display: flex;
	flex-direction: column;
	gap: 1.5rem;
	align-items: center;
	justify-content: center;
}

.preview-text-normal {
	font-size: 16px;
	font-weight: 400;
}

.preview-text-large {
	font-size: 24px;
	font-weight: 700;
}

.contrast-ratio {
	background: var(--surface);
	padding: 1.5rem;
	border-radius: 12px;
	text-align: center;
	margin-bottom: 1.5rem;
	border: 2px solid var(--border);
}

.contrast-ratio h3 {
	margin: 0 0 1rem 0;
	font-size: 1rem;
	color: var(--text-secondary);
}

.ratio-value {
	font-size: 3rem;
	font-weight: 700;
	color: var(--primary-color);
	margin-bottom: 0.5rem;
}

.ratio-description {
	font-size: 0.875rem;
	color: var(--text-secondary);
}

.wcag-compliance {
	background: var(--surface);
	padding: 1.5rem;
	border-radius: 12px;
	margin-bottom: 1.5rem;
	border: 2px solid var(--border);
}

.wcag-compliance h3 {
	margin: 0 0 1.5rem 0;
	font-size: 1.125rem;
}

.compliance-section {
	margin-bottom: 1.5rem;
}

.compliance-section:last-child {
	margin-bottom: 0;
}

.compliance-section h4 {
	margin: 0 0 1rem 0;
	font-size: 1rem;
	color: var(--text-primary);
}

.text-size-info {
	font-size: 0.75rem;
	font-weight: 400;
	color: var(--text-secondary);
}

.compliance-row {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 1rem;
}

.compliance-item {
	padding: 1rem;
	border-radius: 8px;
	border: 2px solid var(--border);
	background: var(--background);
	display: flex;
	justify-content: space-between;
	align-items: center;
}

.compliance-item.pass {
	border-color: var(--success);
	background: rgba(16, 185, 129, 0.05);
}

.compliance-item.fail {
	border-color: var(--error);
	background: rgba(239, 68, 68, 0.05);
}

.compliance-label {
	font-weight: 600;
	font-size: 0.875rem;
}

.compliance-status {
	display: flex;
	align-items: center;
	gap: 0.5rem;
	font-size: 0.875rem;
	font-weight: 600;
}

.compliance-item.pass .compliance-status {
	color: var(--success);
}

.compliance-item.fail .compliance-status {
	color: var(--error);
}

.compliance-status svg {
	width: 20px;
	height: 20px;
}

.color-info-section {
	background: var(--surface);
	padding: 1.5rem;
	border-radius: 12px;
	border: 2px solid var(--border);
}

.color-info-section h3 {
	margin: 0 0 1rem 0;
	font-size: 1.125rem;
}

.color-info-grid {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 1rem;
}

.color-info-item {
	display: flex;
	align-items: center;
	gap: 1rem;
	padding: 1rem;
	background: var(--background);
	border-radius: 8px;
	border: 1px solid var(--border);
}

.color-swatch {
	width: 60px;
	height: 60px;
	border-radius: 8px;
	border: 2px solid var(--border);
	flex-shrink: 0;
}

.color-details {
	flex: 1;
}

.color-label {
	font-size: 0.75rem;
	color: var(--text-secondary);
	margin-bottom: 0.25rem;
}

.color-value {
	font-size: 1rem;
	font-weight: 600;
	font-family: monospace;
	margin-bottom: 0.25rem;
}

.color-rgb {
	font-size: 0.75rem;
	color: var(--text-secondary);
	font-family: monospace;
}

.contrast-error {
	padding: 1.5rem;
	background: rgba(239, 68, 68, 0.1);
	border: 2px solid var(--error);
	border-radius: 8px;
	color: var(--error);
	text-align: center;
}

/* Colorblind Simulator */
.colorblind-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
	gap: 1.5rem;
	margin-bottom: 2rem;
}

.colorblind-card {
	background: var(--surface);
	border: 2px solid var(--border);
	border-radius: 12px;
	overflow: hidden;
	transition: transform 0.2s ease;
}

.colorblind-card:hover {
	transform: translateY(-4px);
	border-color: var(--primary-color);
}

.colorblind-swatch {
	height: 120px;
	position: relative;
	display: flex;
	align-items: center;
	justify-content: center;
}

.swatch-overlay {
	background: rgba(0, 0, 0, 0.7);
	padding: 0.5rem 1rem;
	border-radius: 8px;
}

.swatch-hex {
	color: white;
	font-family: monospace;
	font-size: 1.125rem;
	font-weight: 600;
}

.colorblind-info {
	padding: 1.25rem;
}

.colorblind-info h4 {
	margin: 0 0 0.5rem 0;
	font-size: 1rem;
}

.colorblind-type-en {
	font-size: 0.75rem;
	color: var(--text-secondary);
	margin: 0 0 0.75rem 0;
	font-style: italic;
}

.colorblind-description {
	font-size: 0.875rem;
	color: var(--text-primary);
	margin: 0 0 0.5rem 0;
}

.colorblind-rgb {
	font-size: 0.75rem;
	font-family: monospace;
	color: var(--text-secondary);
	margin: 0 0 0.25rem 0;
}

.colorblind-prevalence {
	font-size: 0.75rem;
	color: var(--text-secondary);
	margin: 0;
}

.accessibility-tips {
	background: var(--surface);
	padding: 1.5rem;
	border-radius: 12px;
	border: 2px solid var(--primary-color);
	border-left-width: 6px;
}

.accessibility-tips h3 {
	margin: 0 0 1rem 0;
	font-size: 1.125rem;
	color: var(--primary-color);
}

.accessibility-tips ul {
	margin: 0;
	padding-left: 1.5rem;
}

.accessibility-tips li {
	margin-bottom: 0.75rem;
	line-height: 1.6;
	color: var(--text-primary);
}

.accessibility-tips li:last-child {
	margin-bottom: 0;
}

.accessibility-tips strong {
	color: var(--primary-color);
}

.colorblind-error {
	padding: 1.5rem;
	background: rgba(239, 68, 68, 0.1);
	border: 2px solid var(--error);
	border-radius: 8px;
	color: var(--error);
	text-align: center;
}

/* ARIA Validator */
.aria-summary {
	background: var(--surface);
	padding: 1.5rem;
	border-radius: 12px;
	margin-bottom: 1.5rem;
	border: 2px solid var(--border);
}

.aria-summary h3 {
	margin: 0 0 1rem 0;
	font-size: 1.125rem;
}

.summary-stats {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
	gap: 1rem;
}

.stat-item {
	padding: 1rem;
	background: var(--background);
	border-radius: 8px;
	text-align: center;
	border: 2px solid var(--border);
}

.stat-item.stat-success {
	border-color: var(--success);
	background: rgba(16, 185, 129, 0.05);
}

.stat-item.stat-error {
	border-color: var(--error);
	background: rgba(239, 68, 68, 0.05);
}

.stat-label {
	display: block;
	font-size: 0.75rem;
	color: var(--text-secondary);
	margin-bottom: 0.5rem;
}

.stat-value {
	display: block;
	font-size: 1.5rem;
	font-weight: 700;
	color: var(--primary-color);
}

.stat-item.stat-success .stat-value {
	color: var(--success);
}

.stat-item.stat-error .stat-value {
	color: var(--error);
}

.aria-issues {
	margin-bottom: 1.5rem;
}

.aria-issues h3 {
	margin: 0 0 1rem 0;
	font-size: 1.125rem;
}

.aria-issue {
	background: var(--surface);
	border: 2px solid var(--border);
	border-left-width: 6px;
	border-radius: 8px;
	padding: 1.25rem;
	margin-bottom: 1rem;
}

.aria-issue:last-child {
	margin-bottom: 0;
}

.aria-issue-error {
	border-left-color: var(--error);
}

.aria-issue-warning {
	border-left-color: #f59e0b;
}

.issue-header {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	margin-bottom: 0.75rem;
}

.issue-icon {
	display: flex;
	align-items: center;
	flex-shrink: 0;
}

.aria-issue-error .issue-icon {
	color: var(--error);
}

.aria-issue-warning .issue-icon {
	color: #f59e0b;
}

.issue-category {
	font-weight: 600;
	font-size: 0.875rem;
}

.aria-issue-error .issue-category {
	color: var(--error);
}

.aria-issue-warning .issue-category {
	color: #f59e0b;
}

.issue-element {
	font-size: 0.75rem;
	color: var(--text-secondary);
	background: var(--background);
	padding: 0.25rem 0.5rem;
	border-radius: 4px;
	font-family: monospace;
}

.issue-message {
	font-size: 0.875rem;
	color: var(--text-primary);
	margin-bottom: 0.5rem;
	line-height: 1.5;
}

.issue-suggestion {
	font-size: 0.8125rem;
	color: var(--text-secondary);
	padding: 0.75rem;
	background: var(--background);
	border-radius: 6px;
	border-left: 3px solid var(--primary-color);
	line-height: 1.5;
}

.aria-valid {
	margin-bottom: 1.5rem;
}

.aria-valid h3 {
	margin: 0 0 1rem 0;
	font-size: 1.125rem;
}

.valid-elements-list {
	display: grid;
	gap: 0.75rem;
}

.valid-element {
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: 8px;
	padding: 1rem;
}

.valid-element-header {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	margin-bottom: 0.5rem;
}

.element-tag {
	font-family: monospace;
	font-size: 0.875rem;
	font-weight: 600;
	color: var(--primary-color);
}

.element-role {
	font-family: monospace;
	font-size: 0.75rem;
	color: var(--text-secondary);
	background: var(--background);
	padding: 0.25rem 0.5rem;
	border-radius: 4px;
}

.element-attrs {
	font-family: monospace;
	font-size: 0.75rem;
	color: var(--text-secondary);
	line-height: 1.6;
}

.aria-best-practices {
	background: var(--surface);
	padding: 1.5rem;
	border-radius: 12px;
	border: 2px solid var(--success);
	border-left-width: 6px;
}

.aria-best-practices h3 {
	margin: 0 0 1rem 0;
	font-size: 1.125rem;
	color: var(--success);
}

.aria-best-practices ul {
	margin: 0;
	padding-left: 1.5rem;
}

.aria-best-practices li {
	margin-bottom: 0.75rem;
	line-height: 1.6;
	color: var(--text-primary);
}

.aria-best-practices li:last-child {
	margin-bottom: 0;
}

.aria-best-practices strong {
	color: var(--success);
}

.aria-error {
	padding: 1.5rem;
	background: rgba(239, 68, 68, 0.1);
	border: 2px solid var(--error);
	border-radius: 8px;
	color: var(--error);
	text-align: center;
}

.error-details {
	font-family: monospace;
	font-size: 0.875rem;
	margin-top: 0.5rem;
}

/* Responsive Styles for Accessibility Tools */
@media (max-width: 768px) {
	.compliance-row {
		grid-template-columns: 1fr;
	}

	.color-info-grid {
		grid-template-columns: 1fr;
	}

	.colorblind-grid {
		grid-template-columns: 1fr;
	}

	.summary-stats {
		grid-template-columns: 1fr;
	}
}

@media (max-width: 480px) {
	.preview-box {
		padding: 2rem 1rem;
	}

	.ratio-value {
		font-size: 2rem;
	}

	.color-info-item {
		flex-direction: column;
		text-align: center;
	}
}

/* ==================== Share Button ==================== */

.share-button-container {
	position: relative;
	display: inline-flex;
	align-items: center;
}

/* 위치 설정 */
.share-position-top-right {
	position: absolute;
	top: 1rem;
	right: 1rem;
	z-index: 100;
}

.share-position-top-left {
	position: absolute;
	top: 1rem;
	left: 1rem;
	z-index: 100;
}

.share-position-bottom-right {
	position: absolute;
	bottom: 1rem;
	right: 1rem;
	z-index: 100;
}

.share-position-bottom-left {
	position: absolute;
	bottom: 1rem;
	left: 1rem;
	z-index: 100;
}

.share-position-inline {
	position: relative;
	display: inline-flex;
	align-items: center;
}

/* 공유 버튼 */
.share-button {
	display: inline-flex;
	align-items: center;
	gap: 0.5rem;
	padding: 0.625rem 1rem;
	border-radius: 8px;
	border: 1px solid var(--border);
	background-color: var(--surface);
	color: var(--text-primary);
	font-size: 14px;
	font-weight: 500;
	cursor: pointer;
	transition: all 0.2s ease;
	box-shadow: var(--shadow-sm);
}

.share-button:hover {
	background-color: var(--surface-hover);
	border-color: var(--primary-color);
	box-shadow: var(--shadow-md);
	transform: translateY(-1px);
}

.share-button:active,
.share-button.active {
	background-color: var(--primary-color);
	color: white;
	border-color: var(--primary-color);
}

.share-button svg {
	width: 20px;
	height: 20px;
	flex-shrink: 0;
}

.share-button.active svg {
	stroke: white;
}

/* 공유 메뉴 */
.share-menu {
	position: absolute;
	top: calc(100% + 0.5rem);
	right: 0;
	min-width: 200px;
	background-color: var(--surface);
	border: 1px solid var(--border);
	border-radius: 8px;
	box-shadow: var(--shadow-lg);
	padding: 0.5rem;
	z-index: 1000;
	animation: slideDown 0.2s ease;
}

@keyframes slideDown {
	from {
		opacity: 0;
		transform: translateY(-10px);
	}
	to {
		opacity: 1;
		transform: translateY(0);
	}
}

.share-menu-item {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	width: 100%;
	padding: 0.625rem 0.75rem;
	border: none;
	border-radius: 6px;
	background-color: transparent;
	color: var(--text-primary);
	font-size: 14px;
	text-align: left;
	cursor: pointer;
	transition: background-color 0.2s ease;
}

.share-menu-item:hover {
	background-color: var(--surface-hover);
}

.share-menu-item:active {
	background-color: var(--border);
}

.share-icon {
	font-size: 18px;
	width: 24px;
	text-align: center;
	flex-shrink: 0;
}

.share-label {
	flex: 1;
	white-space: nowrap;
}

/* 툴팁 */
.share-button[data-tooltip] {
	position: relative;
}

.share-button[data-tooltip]::before {
	content: attr(data-tooltip);
	position: absolute;
	bottom: calc(100% + 8px);
	right: 0;
	padding: 0.5rem 0.75rem;
	background-color: var(--text-primary);
	color: var(--background);
	font-size: 12px;
	font-weight: 500;
	border-radius: 6px;
	white-space: nowrap;
	opacity: 0;
	pointer-events: none;
	transition: opacity 0.2s ease;
	z-index: 1001;
}

.share-button[data-tooltip]::after {
	content: '';
	position: absolute;
	bottom: calc(100% + 2px);
	right: 1rem;
	width: 0;
	height: 0;
	border-left: 6px solid transparent;
	border-right: 6px solid transparent;
	border-top: 6px solid var(--text-primary);
	opacity: 0;
	pointer-events: none;
	transition: opacity 0.2s ease;
}

.share-button[data-tooltip]:hover::before,
.share-button[data-tooltip]:hover::after {
	opacity: 1;
}

/* 반응형 */
@media (max-width: 768px) {
	.share-menu {
		right: auto;
		left: 50%;
		transform: translateX(-50%);
		min-width: 180px;
	}

	.share-button {
		padding: 0.5rem 0.875rem;
		font-size: 13px;
	}
}

@media (max-width: 480px) {
	.share-position-top-right,
	.share-position-top-left {
		top: 0.5rem;
	}

	.share-position-top-right {
		right: 0.5rem;
	}

	.share-position-top-left {
		left: 0.5rem;
	}

	.share-button span {
		display: none; /* 모바일에서는 아이콘만 표시 */
	}

	.share-button {
		padding: 0.5rem;
		width: 40px;
		height: 40px;
		justify-content: center;
	}
}

/* ========================================
   Skip to Content Link
   ======================================== */
.skip-link {
	position: absolute;
	top: -40px;
	left: 0;
	background: var(--primary-color);
	color: white;
	padding: 8px 16px;
	text-decoration: none;
	border-radius: 0 0 4px 0;
	z-index: 1000;
	font-weight: 600;
	transition: top 0.3s ease;
}

.skip-link:focus {
	top: 0;
	outline: 2px solid var(--primary-color);
	outline-offset: 2px;
}

/* ========================================
   Breadcrumb Navigation
   ======================================== */
.breadcrumb-nav {
	background-color: var(--surface);
	border-bottom: 1px solid var(--border);
	padding: 0.75rem 1.5rem;
}

.breadcrumb {
	list-style: none;
	padding: 0;
	margin: 0;
	display: flex;
	align-items: center;
	flex-wrap: wrap;
	gap: 0.5rem;
	max-width: 1400px;
	margin: 0 auto;
}

.breadcrumb li {
	display: flex;
	align-items: center;
	font-size: 14px;
	color: var(--text-secondary);
}

.breadcrumb li a {
	color: var(--primary-color);
	text-decoration: none;
	transition: var(--transition);
	padding: 4px 8px;
	border-radius: 4px;
}

.breadcrumb li a:hover {
	background-color: var(--surface-hover);
	text-decoration: underline;
}

.breadcrumb li:not(:last-child)::after {
	content: "›";
	margin-left: 0.5rem;
	color: var(--text-tertiary);
	font-size: 16px;
}

.breadcrumb li.active {
	color: var(--text-primary);
	font-weight: 500;
}

@media (max-width: 768px) {
	.breadcrumb-nav {
		padding: 0.5rem 1rem;
	}

	.breadcrumb li {
		font-size: 13px;
	}
}

/* ========================================
   Contrast Checker Specific Styles
   ======================================== */
.suggestions-section {
	margin-top: 2rem;
	padding: 1.5rem;
	background: var(--surface);
	border-radius: 8px;
	border: 2px solid var(--warning);
}

.suggestions-section h3 {
	margin-bottom: 1rem;
	color: var(--warning);
}

.suggestions-description {
	margin-bottom: 1rem;
	color: var(--text-secondary);
}

.suggestion-item {
	padding: 1rem;
	background: var(--bg);
	border-radius: 8px;
	margin-bottom: 1rem;
}

.suggestion-preview {
	margin-bottom: 1rem;
}

.suggestion-colors-grid {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 1rem;
}

.suggestion-color-label {
	font-size: 0.9rem;
	color: var(--text-secondary);
	margin-bottom: 0.5rem;
}

.suggestion-color-display {
	display: flex;
	align-items: center;
	gap: 0.5rem;
}

.suggestion-color-swatch {
	width: 40px;
	height: 40px;
	border: 1px solid var(--border);
	border-radius: 4px;
}

.suggestion-color-info {
	flex: 1;
}

.suggestion-color-hex {
	font-weight: 600;
}

.suggestion-color-rgb {
	font-size: 0.85rem;
	color: var(--text-secondary);
}

.suggestion-ratio-display {
	margin-top: 1rem;
	padding: 0.75rem;
	background: var(--success-bg, rgba(34, 197, 94, 0.1));
	border-radius: 4px;
	text-align: center;
}

.suggestion-ratio-label {
	font-size: 0.9rem;
	color: var(--text-secondary);
}

.suggestion-ratio-value {
	font-size: 1.2rem;
	font-weight: bold;
	color: var(--success, #22c55e);
}

/* ========================================
   Pomodoro Timer Specific Styles
   ======================================== */
.pomodoro-stats-grid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
	gap: 16px;
}

.pomodoro-stat-card {
	padding: 16px;
	background: var(--surface);
	border-radius: 12px;
	border-left: 4px solid var(--primary-color);
}

.pomodoro-stat-card.success-border {
	border-left-color: var(--success);
}

.pomodoro-stat-value {
	font-size: 28px;
	font-weight: 700;
	color: var(--primary-color);
}

.pomodoro-stat-value.success-color {
	color: var(--success);
}

.pomodoro-stat-label {
	font-size: 13px;
	color: var(--text-secondary);
	margin-top: 4px;
}