/*
 * XViewer for Pixiv 紹介サイトの配色と体裁。
 * 配色トークンの名前と値は拡張本体の UI_DESIGN_KIT.md §2 に合わせてある。
 * 色は必ずここの変数で決め、個々の規則に直書きしない。
 */

:root {
	color-scheme: dark;
	--bg: #14161c;
	--surface: #1d212b;
	--surface-2: #232838;
	--fg: #eff0f4;
	--muted: #9aa0b4;
	--border: #262b38;
	--divider: rgba(255, 255, 255, 0.12);
	--accent: #4ea3d6;
	--on-accent: #04121a;
	--accent-soft: rgba(78, 163, 214, 0.14);
	--hover: rgba(255, 255, 255, 0.08);
	--shadow: 0 18px 50px rgba(0, 0, 0, 0.45);

	--maxw: 1120px;
	--radius: 14px;
	--radius-sm: 8px;
	--gap: 24px;
	--section-gap: 96px;
	--pad-x: 24px;

	--font: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans",
		"BIZ UDPGothic", Meiryo, "Yu Gothic", "Noto Sans JP", system-ui, sans-serif;
	--font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
}

/* OS がライトで、かつ利用者が明示的にダークを選んでいないときだけライトへ倒す */
@media (prefers-color-scheme: light) {
	:root:not([data-theme="dark"]) {
		color-scheme: light;
		--bg: #f5f6f8;
		--surface: #ffffff;
		--surface-2: #eef0f4;
		--fg: #1c1e26;
		--muted: #5c6275;
		--border: #d6d9e0;
		--divider: rgba(0, 0, 0, 0.12);
		--accent: #1a6b9e;
		--on-accent: #ffffff;
		--accent-soft: rgba(26, 107, 158, 0.10);
		--hover: rgba(0, 0, 0, 0.05);
		--shadow: 0 18px 50px rgba(20, 24, 35, 0.14);
	}
}

/* 手動で選んだライト。media query より後に置いて必ず勝たせる */
:root[data-theme="light"] {
	color-scheme: light;
	--bg: #f5f6f8;
	--surface: #ffffff;
	--surface-2: #eef0f4;
	--fg: #1c1e26;
	--muted: #5c6275;
	--border: #d6d9e0;
	--divider: rgba(0, 0, 0, 0.12);
	--accent: #1a6b9e;
	--on-accent: #ffffff;
	--accent-soft: rgba(26, 107, 158, 0.10);
	--hover: rgba(0, 0, 0, 0.05);
	--shadow: 0 18px 50px rgba(20, 24, 35, 0.14);
}

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

html {
	scroll-behavior: smooth;
	scroll-padding-top: 88px;
}

@media (prefers-reduced-motion: reduce) {
	html {
		scroll-behavior: auto;
	}

	* {
		animation-duration: 0.01ms !important;
		transition-duration: 0.01ms !important;
	}
}

body {
	margin: 0;
	background: var(--bg);
	color: var(--fg);
	font-family: var(--font);
	font-size: 16px;
	line-height: 1.8;
	-webkit-font-smoothing: antialiased;
}

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

a {
	color: var(--accent);
	text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent);
	text-underline-offset: 3px;
}

a:hover {
	text-decoration-color: currentColor;
}

/* 輪郭はサイト全体で 1 つの規則にそろえる (UI_DESIGN_KIT §6) */
:where(a, button, summary, [tabindex]):focus-visible {
	outline: 2px solid var(--accent);
	outline-offset: 2px;
	border-radius: 4px;
}

h1,
h2,
h3 {
	line-height: 1.35;
	letter-spacing: 0.01em;
	margin: 0;
}

p {
	margin: 0 0 1em;
}

code {
	font-family: var(--font-mono);
	font-size: 0.9em;
	background: var(--surface-2);
	border: 1px solid var(--border);
	border-radius: 4px;
	padding: 0.1em 0.4em;
}

/* 目に見えないが読み上げには残す */
.visually-hidden {
	position: absolute;
	width: 1px;
	height: 1px;
	margin: -1px;
	padding: 0;
	overflow: hidden;
	clip-path: inset(50%);
	white-space: nowrap;
}

.skip-link {
	position: absolute;
	left: 8px;
	top: -60px;
	z-index: 100;
	background: var(--accent);
	color: var(--on-accent);
	padding: 10px 16px;
	border-radius: var(--radius-sm);
	font-weight: 700;
	text-decoration: none;
	transition: top 0.15s ease;
}

.skip-link:focus {
	top: 8px;
}

.wrap {
	width: 100%;
	max-width: var(--maxw);
	margin: 0 auto;
	padding-inline: var(--pad-x);
}

/* ------------------------------------------------------------------ header */

.site-header {
	position: sticky;
	top: 0;
	z-index: 50;
	background: color-mix(in srgb, var(--bg) 88%, transparent);
	backdrop-filter: saturate(180%) blur(12px);
	border-bottom: 1px solid var(--border);
}

.site-header .wrap {
	display: flex;
	align-items: center;
	gap: 16px;
	min-height: 64px;
}

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

.brand img {
	width: 28px;
	height: 28px;
	border-radius: 6px;
}

.site-nav {
	display: flex;
	align-items: center;
	gap: 4px;
	margin-inline-start: auto;
}

.site-nav a {
	color: var(--muted);
	text-decoration: none;
	padding: 8px 12px;
	border-radius: var(--radius-sm);
	font-size: 14px;
}

.site-nav a:hover {
	color: var(--fg);
	background: var(--hover);
}

.header-tools {
	display: flex;
	align-items: center;
	gap: 8px;
}

.lang-switch {
	display: inline-flex;
	border: 1px solid var(--border);
	border-radius: 999px;
	overflow: hidden;
	background: var(--surface);
}

.lang-switch a {
	padding: 5px 12px;
	font-size: 13px;
	font-weight: 700;
	color: var(--muted);
	text-decoration: none;
	line-height: 1.6;
}

.lang-switch a[aria-current="true"] {
	background: var(--accent);
	color: var(--on-accent);
}

.lang-switch a:not([aria-current="true"]):hover {
	background: var(--hover);
	color: var(--fg);
}

.theme-toggle {
	display: inline-grid;
	place-items: center;
	width: 36px;
	height: 36px;
	border: 1px solid var(--border);
	border-radius: 999px;
	background: var(--surface);
	color: var(--fg);
	cursor: pointer;
	padding: 0;
}

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

.theme-toggle svg {
	width: 18px;
	height: 18px;
	fill: currentColor;
}

/* テーマに応じて片方のアイコンだけ出す */
.theme-toggle .icon-sun {
	display: none;
}

:root[data-theme="light"] .theme-toggle .icon-sun,
.theme-toggle .icon-moon {
	display: block;
}

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

@media (prefers-color-scheme: light) {
	:root:not([data-theme="dark"]) .theme-toggle .icon-sun {
		display: block;
	}

	:root:not([data-theme="dark"]) .theme-toggle .icon-moon {
		display: none;
	}
}

/* ------------------------------------------------------------------- hero */

.hero {
	padding-block: 72px 0;
	text-align: center;
	position: relative;
	overflow: hidden;
}

/* 背景の淡い光。装飾なので読み上げからは外れる */
.hero::before {
	content: "";
	position: absolute;
	inset-inline: 0;
	top: -220px;
	height: 520px;
	background: radial-gradient(ellipse 60% 55% at 50% 50%, var(--accent-soft), transparent 70%);
	pointer-events: none;
}

.hero .wrap {
	position: relative;
}

.eyebrow {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	font-size: 13px;
	font-weight: 700;
	color: var(--accent);
	background: var(--accent-soft);
	border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
	border-radius: 999px;
	padding: 5px 14px;
	margin-bottom: 24px;
}

.hero h1 {
	font-size: clamp(34px, 6vw, 60px);
	letter-spacing: -0.01em;
	margin-bottom: 20px;
}

.hero h1 .accent {
	color: var(--accent);
}

.lede {
	font-size: clamp(16px, 2.2vw, 19px);
	color: var(--muted);
	max-width: 46em;
	margin-inline: auto;
	text-wrap: pretty;
}

.cta-row {
	display: flex;
	flex-wrap: wrap;
	gap: 12px;
	justify-content: center;
	margin-block: 32px 12px;
}

.btn {
	display: inline-flex;
	align-items: center;
	gap: 10px;
	border-radius: 999px;
	padding: 13px 26px;
	font-size: 15px;
	font-weight: 700;
	text-decoration: none;
	border: 1px solid transparent;
	cursor: pointer;
	font-family: inherit;
}

.btn svg {
	width: 18px;
	height: 18px;
	fill: currentColor;
	flex: none;
}

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

.btn-primary:hover {
	background: color-mix(in srgb, var(--accent) 86%, var(--fg));
}

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

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

/* ストア公開までの無効状態。押せないことが見た目で分かるようにする */
.btn[aria-disabled="true"] {
	background: var(--surface);
	color: var(--muted);
	border-color: var(--border);
	cursor: not-allowed;
}

.btn[aria-disabled="true"]:hover {
	background: var(--surface);
}

.cta-note {
	font-size: 13px;
	color: var(--muted);
	margin: 0;
}

.hero-shot {
	margin-top: 56px;
	border-radius: var(--radius);
	border: 1px solid var(--border);
	background: var(--surface);
	box-shadow: var(--shadow);
	overflow: hidden;
	line-height: 0;
}

.hero-shot img {
	width: 100%;
	display: block;
}

/* ---------------------------------------------------------------- section */

.section {
	padding-block: var(--section-gap);
}

.section-head {
	max-width: 42em;
	margin-bottom: 48px;
}

.section-head.center {
	margin-inline: auto;
	text-align: center;
}

.section h2 {
	font-size: clamp(26px, 4vw, 36px);
	margin-bottom: 16px;
}

.section-head p {
	color: var(--muted);
	margin: 0;
	text-wrap: pretty;
}

.divider {
	border: 0;
	border-top: 1px solid var(--border);
	margin: 0;
}

/* ------------------------------------------------------------------ cards */

.card-grid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
	gap: var(--gap);
}

.card {
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--radius);
	padding: 26px;
}

.card h3 {
	font-size: 17px;
	margin-bottom: 10px;
	display: flex;
	align-items: center;
	gap: 10px;
}

.card p {
	color: var(--muted);
	font-size: 14.5px;
	margin: 0;
}

.card-icon {
	display: grid;
	place-items: center;
	width: 34px;
	height: 34px;
	border-radius: 9px;
	background: var(--accent-soft);
	color: var(--accent);
	flex: none;
}

.card-icon svg {
	width: 19px;
	height: 19px;
	fill: currentColor;
}

/* --------------------------------------------------------------- showcase */

.showcase {
	display: grid;
	grid-template-columns: 1fr 1.25fr;
	gap: 56px;
	align-items: center;
}

.showcase + .showcase {
	margin-top: var(--section-gap);
}

.showcase.reverse .showcase-text {
	order: 2;
}

.showcase h3 {
	font-size: clamp(21px, 3vw, 27px);
	margin-bottom: 14px;
}

.showcase p {
	color: var(--muted);
	margin-bottom: 0;
}

.showcase figure {
	margin: 0;
	border-radius: var(--radius);
	border: 1px solid var(--border);
	background: var(--surface);
	box-shadow: var(--shadow);
	overflow: hidden;
	line-height: 0;
}

.showcase figure img {
	width: 100%;
	display: block;
}

/* 縦長の図 (設定ポップアップ) は幅を抑えないと段組みが崩れて見える */
.showcase figure.portrait {
	max-width: 380px;
	margin-inline: auto;
}

.feature-list {
	list-style: none;
	padding: 0;
	margin: 18px 0 0;
	color: var(--muted);
	font-size: 14.5px;
}

.feature-list li {
	position: relative;
	padding-inline-start: 24px;
	margin-bottom: 6px;
}

.feature-list li::before {
	content: "";
	position: absolute;
	left: 6px;
	top: 0.72em;
	width: 6px;
	height: 6px;
	border-radius: 50%;
	background: var(--accent);
}

/* ------------------------------------------------------------------ table */

.table-scroll {
	overflow-x: auto;
	border: 1px solid var(--border);
	border-radius: var(--radius);
	background: var(--surface);
}

table {
	width: 100%;
	border-collapse: collapse;
	font-size: 14.5px;
	min-width: 560px;
}

th,
td {
	text-align: start;
	padding: 13px 18px;
	border-bottom: 1px solid var(--divider);
	vertical-align: top;
}

thead th {
	font-size: 13px;
	color: var(--muted);
	font-weight: 700;
	background: var(--surface-2);
	white-space: nowrap;
}

tbody tr:last-child td {
	border-bottom: 0;
}

td.default {
	color: var(--muted);
	white-space: nowrap;
}

/* -------------------------------------------------------------------- キー */

.keys {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
	gap: 12px;
}

.key-row {
	display: flex;
	align-items: center;
	gap: 14px;
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--radius-sm);
	padding: 14px 18px;
	font-size: 14.5px;
	color: var(--muted);
}

kbd {
	font-family: var(--font-mono);
	font-size: 13px;
	color: var(--fg);
	background: var(--surface-2);
	border: 1px solid var(--border);
	border-bottom-width: 2px;
	border-radius: 6px;
	padding: 3px 9px;
	white-space: nowrap;
	flex: none;
}

/* ------------------------------------------------------------------ notice */

.notice {
	background: var(--surface);
	border: 1px solid var(--border);
	border-inline-start: 3px solid var(--accent);
	border-radius: var(--radius-sm);
	padding: 20px 24px;
	font-size: 14.5px;
	color: var(--muted);
}

.notice strong {
	color: var(--fg);
}

.notice p:last-child {
	margin-bottom: 0;
}

.notice ul {
	margin: 0;
	padding-inline-start: 1.2em;
}

.notice li + li {
	margin-top: 6px;
}

/* -------------------------------------------------------------- privacy 用 */

.doc {
	padding-block: 56px var(--section-gap);
}

.doc .wrap {
	max-width: 780px;
}

.doc h1 {
	font-size: clamp(28px, 5vw, 40px);
	margin-bottom: 12px;
}

.doc .doc-meta {
	color: var(--muted);
	font-size: 14px;
	margin-bottom: 40px;
}

.doc h2 {
	font-size: 21px;
	margin-block: 48px 14px;
	padding-top: 24px;
	border-top: 1px solid var(--border);
}

.doc h3 {
	font-size: 17px;
	margin-block: 28px 10px;
}

.doc p,
.doc li {
	color: var(--muted);
}

.doc strong {
	color: var(--fg);
}

.doc ul,
.doc ol {
	padding-inline-start: 1.3em;
	margin-block: 0 1em;
}

.doc li + li {
	margin-top: 8px;
}

.doc .summary-box {
	background: var(--accent-soft);
	border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
	border-radius: var(--radius);
	padding: 22px 26px;
	margin-bottom: 8px;
}

.doc .summary-box p {
	color: var(--fg);
	margin-bottom: 0;
	font-weight: 700;
}

.doc .summary-box p + p {
	margin-top: 8px;
	font-weight: 400;
	color: var(--muted);
}

/* ----------------------------------------------------------------- footer */

.site-footer {
	border-top: 1px solid var(--border);
	background: var(--surface);
	padding-block: 48px;
	font-size: 14px;
	color: var(--muted);
}

.footer-grid {
	display: flex;
	flex-wrap: wrap;
	gap: 32px;
	justify-content: space-between;
	align-items: start;
}

.footer-links {
	display: flex;
	flex-wrap: wrap;
	gap: 8px 24px;
	list-style: none;
	padding: 0;
	margin: 0;
}

.footer-links a {
	color: var(--muted);
	text-decoration: none;
}

.footer-links a:hover {
	color: var(--fg);
	text-decoration: underline;
}

.footer-note {
	max-width: 42em;
	font-size: 13px;
	line-height: 1.75;
	margin-block: 24px 0;
}

.footer-note p {
	margin-bottom: 8px;
}

.footer-note p:last-child {
	margin-bottom: 0;
}

/* ------------------------------------------------------------- responsive */

@media (max-width: 860px) {
	:root {
		--section-gap: 72px;
		--pad-x: 20px;
	}

	.showcase {
		grid-template-columns: 1fr;
		gap: 28px;
	}

	.showcase.reverse .showcase-text {
		order: 0;
	}

	.site-nav {
		display: none;
	}

	.header-tools {
		margin-inline-start: auto;
	}

	.hero {
		padding-block: 48px 0;
	}

	.hero-shot {
		margin-top: 40px;
	}
}

@media (max-width: 520px) {
	.btn {
		width: 100%;
		justify-content: center;
	}

	.cta-row {
		gap: 10px;
	}
}