/* ==========================================================
	テーマ変数
========================================================== */
:root {
	--colorBg: #ffffff;
	--colorBgAlt: #f4f6fa;
	--colorText: #1d2433;
	--colorMuted: #5d6778;
	--colorBorder: #dde2ea;
	--colorPrimary: #2f6fed;
	--colorPrimaryHover: #1f58c9;
	--colorError: #d23c3c;
	--radius: 10px;
	--shadow: 0 4px 16px rgba(20, 30, 60, 0.08);
	--headerHeight: 64px;
	color-scheme: light;
}

@media (prefers-color-scheme: dark) {
	:root:not([data-theme="light"]) {
		--colorBg: #12161f;
		--colorBgAlt: #1a202c;
		--colorText: #e6e9ef;
		--colorMuted: #9aa3b2;
		--colorBorder: #2c3443;
		--colorPrimary: #5b8cff;
		--colorPrimaryHover: #7aa2ff;
		--colorError: #ff6b6b;
		--shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
		color-scheme: dark;
	}
}

:root[data-theme="dark"] {
	--colorBg: #12161f;
	--colorBgAlt: #1a202c;
	--colorText: #e6e9ef;
	--colorMuted: #9aa3b2;
	--colorBorder: #2c3443;
	--colorPrimary: #5b8cff;
	--colorPrimaryHover: #7aa2ff;
	--colorError: #ff6b6b;
	--shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
	color-scheme: dark;
}

/* ==========================================================
	ベース
========================================================== */
*,
*::before,
*::after {
	box-sizing: border-box;
}

html {
	scroll-behavior: smooth;
}

body {
	margin: 0;
	font-family: "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", "Meiryo", sans-serif;
	line-height: 1.8;
	color: var(--colorText);
	background: var(--colorBg);
	transition: background-color 0.2s, color 0.2s;
}

img {
	max-width: 100%;
	height: auto;
}

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

h1,
h2,
h3 {
	line-height: 1.4;
}

.container {
	width: 100%;
	max-width: 1080px;
	margin: 0 auto;
	padding: 0 20px;
}

.narrow {
	max-width: 760px;
}

.muted {
	color: var(--colorMuted);
}

/* ==========================================================
	ヘッダー・ナビゲーション
========================================================== */
.siteHeader {
	position: sticky;
	top: 0;
	z-index: 100;
	background: var(--colorBg);
	border-bottom: 1px solid var(--colorBorder);
}

.headerInner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	height: var(--headerHeight);
}

.brand {
	display: flex;
	align-items: center;
	gap: 10px;
	font-weight: 700;
	color: var(--colorText);
	text-decoration: none;
}

.globalNav ul {
	display: flex;
	gap: 8px;
	margin: 0;
	padding: 0;
	list-style: none;
}

.globalNav a {
	display: block;
	padding: 8px 14px;
	border-radius: 6px;
	color: var(--colorText);
	text-decoration: none;
}

.globalNav a:hover {
	background: var(--colorBgAlt);
}

.globalNav a[aria-current="page"] {
	color: var(--colorPrimary);
	font-weight: 700;
}

.navToggle {
	display: none;
	flex-direction: column;
	justify-content: center;
	gap: 5px;
	width: 44px;
	height: 44px;
	padding: 10px;
	border: 0;
	background: transparent;
	cursor: pointer;
}

.navToggle span {
	display: block;
	height: 2px;
	background: var(--colorText);
	transition: transform 0.2s, opacity 0.2s;
}

.navToggle[aria-expanded="true"] span:nth-child(1) {
	transform: translateY(7px) rotate(45deg);
}

.navToggle[aria-expanded="true"] span:nth-child(2) {
	opacity: 0;
}

.navToggle[aria-expanded="true"] span:nth-child(3) {
	transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 720px) {
	.navToggle {
		display: flex;
	}

	.globalNav {
		position: absolute;
		top: var(--headerHeight);
		left: 0;
		right: 0;
		display: none;
		background: var(--colorBg);
		border-bottom: 1px solid var(--colorBorder);
		box-shadow: var(--shadow);
	}

	.globalNav.isOpen {
		display: block;
	}

	.globalNav ul {
		flex-direction: column;
		gap: 0;
		padding: 8px 20px 16px;
	}

	.globalNav a {
		padding: 12px 8px;
	}
}

/* ==========================================================
	ボタン
========================================================== */
.btn {
	display: inline-block;
	padding: 12px 24px;
	border: 2px solid transparent;
	border-radius: var(--radius);
	font: inherit;
	font-weight: 700;
	text-decoration: none;
	cursor: pointer;
	transition: background-color 0.2s, color 0.2s, border-color 0.2s;
}

.btnPrimary {
	color: #ffffff;
	background: var(--colorPrimary);
}

.btnPrimary:hover {
	background: var(--colorPrimaryHover);
}

.btnGhost {
	color: var(--colorPrimary);
	background: transparent;
	border-color: var(--colorPrimary);
}

.btnGhost:hover {
	background: var(--colorBgAlt);
}

/* ==========================================================
	セクション
========================================================== */
.hero {
	padding: 96px 0 80px;
	background: linear-gradient(135deg, var(--colorBgAlt), var(--colorBg));
}

.hero h1 {
	margin: 0 0 16px;
	font-size: clamp(1.8rem, 5vw, 2.8rem);
}

.eyebrow {
	margin: 0 0 8px;
	font-size: 0.85rem;
	font-weight: 700;
	letter-spacing: 0.15em;
	color: var(--colorPrimary);
}

.lead {
	max-width: 640px;
	font-size: 1.1rem;
	color: var(--colorMuted);
}

.heroActions {
	display: flex;
	flex-wrap: wrap;
	gap: 12px;
	margin-top: 28px;
}

.pageHeader {
	padding: 56px 0 32px;
	background: var(--colorBgAlt);
}

.pageHeader h1 {
	margin: 0 0 8px;
}

.section {
	padding: 64px 0;
}

.sectionAlt {
	background: var(--colorBgAlt);
}

.sectionTitle {
	margin: 0 0 32px;
	text-align: center;
}

/* ==========================================================
	カード
========================================================== */
.cardGrid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
	gap: 24px;
}

.card {
	padding: 28px;
	background: var(--colorBg);
	border: 1px solid var(--colorBorder);
	border-radius: var(--radius);
	box-shadow: var(--shadow);
}

.card h3 {
	margin: 12px 0 8px;
}

.card p {
	margin: 0;
	color: var(--colorMuted);
}

.cardIcon {
	display: inline-grid;
	place-items: center;
	width: 44px;
	height: 44px;
	border-radius: 50%;
	font-weight: 700;
	color: #ffffff;
	background: var(--colorPrimary);
}

/* ==========================================================
	動作確認ブロック
========================================================== */
.counterBox {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 20px;
	margin: 20px 0;
}

.counterBox p {
	margin: 0;
	font-size: 1.1rem;
}

/* ==========================================================
	概要ページ
========================================================== */
.codeBlock {
	overflow-x: auto;
	padding: 20px;
	background: var(--colorBgAlt);
	border: 1px solid var(--colorBorder);
	border-radius: var(--radius);
	font-family: "SFMono-Regular", Consolas, monospace;
	font-size: 0.9rem;
	line-height: 1.6;
}

.dataTable {
	width: 100%;
	margin-bottom: 32px;
	border-collapse: collapse;
}

.dataTable th,
.dataTable td {
	padding: 12px;
	border-bottom: 1px solid var(--colorBorder);
	text-align: left;
	vertical-align: top;
}

.dataTable th {
	background: var(--colorBgAlt);
}

.faqItem {
	margin-bottom: 12px;
	padding: 16px 20px;
	border: 1px solid var(--colorBorder);
	border-radius: var(--radius);
}

.faqItem summary {
	font-weight: 700;
	cursor: pointer;
}

.faqItem p {
	margin: 12px 0 0;
	color: var(--colorMuted);
}

/* ==========================================================
	フォーム
========================================================== */
.formRow {
	margin-bottom: 20px;
}

.formRow label {
	display: block;
	margin-bottom: 6px;
	font-weight: 700;
}

.formRow input[type="text"],
.formRow input[type="email"],
.formRow select,
.formRow textarea {
	width: 100%;
	padding: 12px;
	border: 1px solid var(--colorBorder);
	border-radius: 8px;
	font: inherit;
	color: var(--colorText);
	background: var(--colorBg);
}

.formRow input:focus,
.formRow select:focus,
.formRow textarea:focus {
	outline: 2px solid var(--colorPrimary);
	outline-offset: 1px;
}

.formRow .isInvalid {
	border-color: var(--colorError);
}

.formCheck label {
	font-weight: 400;
}

.required {
	margin-left: 6px;
	padding: 2px 6px;
	border-radius: 4px;
	font-size: 0.75rem;
	color: #ffffff;
	background: var(--colorError);
}

.fieldError {
	min-height: 1em;
	margin: 4px 0 0;
	font-size: 0.85rem;
	color: var(--colorError);
}

.charCount {
	margin: 4px 0 0;
	font-size: 0.85rem;
	text-align: right;
	color: var(--colorMuted);
}

.formResult {
	padding: 28px;
	background: var(--colorBgAlt);
	border-radius: var(--radius);
}

.formResult h2 {
	margin-top: 0;
}

.formResult dt {
	font-weight: 700;
}

.formResult dd {
	margin: 0 0 16px;
	white-space: pre-wrap;
	word-break: break-word;
}

/* ==========================================================
	フッター・テーマ切り替え
========================================================== */
.siteFooter {
	padding: 32px 0;
	border-top: 1px solid var(--colorBorder);
	text-align: center;
	font-size: 0.9rem;
	color: var(--colorMuted);
}

.themeToggle {
	position: fixed;
	right: 20px;
	bottom: 20px;
	width: 48px;
	height: 48px;
	border: 1px solid var(--colorBorder);
	border-radius: 50%;
	font-size: 1.3rem;
	color: var(--colorText);
	background: var(--colorBg);
	box-shadow: var(--shadow);
	cursor: pointer;
}

/* ==========================================================
	404
========================================================== */
.errorMain {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	min-height: 100vh;
	padding: 20px;
	text-align: center;
}

.errorCode {
	margin: 0;
	font-size: 6rem;
	font-weight: 700;
	line-height: 1;
	color: var(--colorPrimary);
}