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

:root {
	--color-bg: #f4f6fb;
	--color-panel: #ffffff;
	--color-border: rgba(15, 23, 42, 0.08);
	--color-text: #1f2937;
	--color-muted: #6b7280;
	--color-accent: #1a73e8;
	--color-accent-dark: #1558c2;
	--color-danger: #dc3545;
	--color-danger-dark: #b42a39;
	--color-input-border: #d9dee8;
	--shadow-panel: 0 10px 30px rgba(15, 23, 42, 0.08);
	--radius-panel: 16px;
}

body {
	margin: 0;
	background: var(--color-bg);
	color: var(--color-text);
	font-family: 'Noto Sans JP', 'Inter', sans-serif;
	font-size: 14px;
	line-height: 1.6;
}

.app-header {
	max-width: 1180px;
	margin: 0 auto;
	padding: 32px 32px 16px;
}

.app-title {
	margin: 0;
	font-size: 28px;
	font-weight: 700;
	letter-spacing: 0.02em;
}

.app-subtitle {
	margin: 8px 0 0;
	color: var(--color-muted);
	font-size: 15px;
}

.app-main {
	max-width: 1180px;
	margin: 0 auto;
	padding: 0 32px 48px;
	display: flex;
	flex-direction: column;
	gap: 24px;
}

.container {
	display: grid;
	grid-template-columns: 310px 1fr;
	gap: 24px;
	align-items: start;
}

.panel {
	background: var(--color-panel);
	border-radius: var(--radius-panel);
	border: 1px solid var(--color-border);
	box-shadow: var(--shadow-panel);
	padding: 24px;
}

.panel-left {
	display: flex;
	flex-direction: column;
	gap: 24px;
}

.panel-right {
	display: flex;
	flex-direction: column;
	gap: 20px;
}

.panel-right #chart {
	width: 100%;
}

.panel-title {
	font-size: 16px;
	font-weight: 600;
	margin-bottom: 12px;
}

.code-title {
	margin-bottom: 20px;
}

.chart-wrapper {
	background: #fbfcff;
	border: 1px solid var(--color-border);
	border-radius: 12px;
	padding: 24px;
	min-height: 340px;
	display: flex;
	align-items: center;
	justify-content: center;
	box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.8);
	position: relative;
	overflow: hidden;
}

#chart {
	width: 100%;
	height: 100%;
}

#chart svg {
	max-width: 100%;
	height: auto;
	overflow: visible;
}

.control-group {
	display: flex;
	flex-direction: column;
	gap: 12px;
	padding: 20px;
	background: rgba(248, 250, 255, 0.7);
	border: 1px solid var(--color-border);
	border-radius: 14px;
}

.accordion {
	background: rgba(248, 250, 255, 0.7);
	border: 1px solid var(--color-border);
	border-radius: 14px;
	box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.5);
	overflow: hidden;
}

.accordion + .accordion {
	margin-top: 16px;
}

.accordion-header {
	width: 100%;
	padding: 16px 20px;
	background: none;
	border: none;
	display: flex;
	align-items: center;
	justify-content: space-between;
	font-size: 14px;
	font-weight: 600;
	color: var(--color-text);
	cursor: pointer;
}

.accordion-header:hover {
	background: rgba(26, 115, 232, 0.08);
}

.accordion-icon {
	width: 12px;
	height: 12px;
	border-right: 2px solid var(--color-muted);
	border-bottom: 2px solid var(--color-muted);
	transform: rotate(45deg);
	transition: transform 0.2s ease, border-color 0.2s ease;
}

.accordion.is-open .accordion-icon {
	transform: rotate(225deg);
	border-color: var(--color-accent);
}

.accordion-content {
	padding: 0 20px 20px;
	display: block;
}

.accordion:not(.is-open) .accordion-content {
	display: none;
}

.accordion-content > * + * {
	margin-top: 16px;
}

.accordion .coordinates-inputs > div {
	display: flex;
	flex-direction: column;
	gap: 6px;
}

.accordion .control-label {
	font-size: 11px;
}

.accordion .coordinates-inputs > div {
	background: none;
	border: none;
	padding: 0;
}

.section-title {
	font-size: 15px;
	font-weight: 600;
	margin-bottom: 4px;
}

.control-label {
	font-size: 12px;
	font-weight: 600;
	color: var(--color-muted);
}

input[type="text"],
input[type="number"],
select {
	width: 100%;
	padding: 10px 12px;
	border: 1px solid var(--color-input-border);
	border-radius: 10px;
	font-size: 13px;
	background: #fdfdff;
	transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
	outline: none;
	border-color: var(--color-accent);
	box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.15);
}

input[type="number"]::-webkit-inner-spin-button {
	margin: 0;
}

button {
	padding: 10px 14px;
	border: none;
	border-radius: 10px;
	font-size: 13px;
	font-weight: 600;
	cursor: pointer;
	transition: transform 0.1s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

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

.btn-primary {
	background: var(--color-accent);
	color: #fff;
	box-shadow: 0 8px 16px rgba(26, 115, 232, 0.24);
}

.btn-primary:hover {
	background: var(--color-accent-dark);
}

.btn-secondary {
	background: #eef2ff;
	color: #1d4ed8;
	border: 1px solid rgba(59, 130, 246, 0.2);
}

.btn-secondary:hover,
.radial-controls button.is-active {
	background: var(--color-accent);
	color: #fff;
	border-color: transparent;
}

.btn-danger {
	background: var(--color-danger);
	color: #fff;
}

.btn-danger:hover {
	background: var(--color-danger-dark);
}

.preset-buttons {
	display: flex;
	flex-direction: column;
	gap: 10px;
}

.preset-buttons button {
	width: 100%;
	justify-content: flex-start;
}

.direction-controls,
.radial-controls {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 12px;
}

.radial-controls {
	display: none;
}

.radial-controls button {
	width: 100%;
}

.coordinates-inputs {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 12px;
}

.coordinates-display {
	font-size: 12px;
	color: var(--color-muted);
	background: #f3f5fb;
	border: 1px solid var(--color-border);
	border-radius: 10px;
	padding: 12px;
	font-family: 'Roboto Mono', monospace;
	line-height: 1.5;
	word-break: break-word;
}

.gradient-preview {
	width: 100%;
	height: 60px;
	border-radius: 12px;
	border: 1px solid var(--color-border);
	background: linear-gradient(135deg, #0ea5e9 0%, #6366f1 100%);
	box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.2);
}

.stop-item {
	background: #f9fbff;
	border: 1px solid var(--color-border);
	border-radius: 12px;
	padding: 14px;
	display: flex;
	flex-direction: column;
	gap: 12px;
}

.stop-header {
	display: flex;
	align-items: center;
	justify-content: space-between;
}

.stop-number {
	font-weight: 600;
}

.color-input-wrapper {
	display: flex;
	align-items: center;
	gap: 10px;
}

input[type="color"] {
	width: 44px;
	height: 34px;
	border: 1px solid var(--color-input-border);
	border-radius: 8px;
	padding: 0;
	cursor: pointer;
	background: transparent;
}

.color-value {
	flex: 1;
	font-family: 'Roboto Mono', monospace;
	font-size: 12px;
}

.stop-controls {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 12px;
}

.panel-code {
	display: flex;
	flex-direction: column;
	gap: 18px;
}

.inline-code-panel {
	padding: 20px;
	gap: 16px;
}

.inline-code-panel .panel-title {
	margin-bottom: 8px;
}

.code-section {
	display: flex;
	flex-direction: column;
	gap: 8px;
}

.code-section-title {
	font-size: 13px;
	font-weight: 600;
	color: var(--color-muted);
}

.export-code {
	background: #f8fafc;
	border: 1px solid rgba(148, 163, 184, 0.4);
	border-radius: 12px;
	padding: 14px;
	font-family: 'Roboto Mono', monospace;
	font-size: 12px;
	line-height: 1.5;
	white-space: pre-wrap;
	word-break: break-word;
	max-height: 220px;
	overflow-y: auto;
}

.axis path,
.axis line {
	fill: none;
	stroke: #d0d6e6;
	shape-rendering: crispEdges;
}

.axis text {
	fill: rgba(55, 65, 81, 0.65);
	font-size: 12px;
	font-family: 'Noto Sans JP', sans-serif;
}

.line {
	stroke: #1f2937;
	stroke-width: 1.8px;
	fill: none;
}

.lineDots {
	fill: #1f2937;
}

.bar {
	stroke: rgba(15, 23, 42, 0.25);
	stroke-width: 0.8;
}

.slice {
	stroke: rgba(15, 23, 42, 0.25);
	stroke-width: 0.8;
}

@media (max-width: 980px) {
	.container {
		grid-template-columns: 1fr;
	}

	.panel-right {
		order: -1;
	}

	.app-main {
		padding: 0 20px 40px;
	}

	.panel-left {
		max-height: none;
	}

	.chart-wrapper {
		min-height: 280px;
	}
}