/* ============================================================
   EIBUN — base / reset / variables / typography / utilities
   ============================================================ */

/* ---------- CSS variables ---------- */
:root {
	/* brand */
	--c-brand:        #0ea5d6;
	--c-brand-dark:   #0892bd;
	--c-ink:          #111111;
	--c-ink-soft:     #333333;
	--c-mute:         #666666;
	--c-mute-2:       #888888;
	--c-line:         #e5e5e5;
	--c-line-soft:    #efefef;
	--c-bg:           #ffffff;
	--c-bg-soft:      #fafafa;
	--c-bg-warm:      #fafaf7;
	--c-on-dark:      #ffffff;
	--c-cta-warning:  #c8352a;

	/* type — Web フォントで Mac/Windows 同じ見え方を担保 */
	--ff-jp: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", "游明朝", serif;
	--ff-sans: "Inter", "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", system-ui, -apple-system, sans-serif;
	--ff-display: "Inter", "Helvetica Neue", "Arial", sans-serif;

	/* sizes */
	--container: 1200px;
	--gutter: clamp(1.25rem, 4vw, 2.5rem);

	/* timing — 全体的に少しゆっくり */
	--ease: cubic-bezier(0.22, 1, 0.36, 1);
	--dur-1: 0.35s;
	--dur-2: 0.8s;
	--dur-3: 1.3s;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html {
	-webkit-text-size-adjust: 100%;
	text-size-adjust: 100%;
	scroll-behavior: smooth;
	/* ベースフォントサイズを vw 連動に。SP では小さく、PC では従来比でやや控えめ */
	font-size: clamp(14px, 0.85vw + 12px, 16px);
}
body {
	margin: 0;
	font-family: var(--ff-sans);
	color: var(--c-ink);
	background: var(--c-bg);
	line-height: 1.65;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	text-rendering: optimizeLegibility;
	/* 日本語の不自然な行折り返しを抑制 */
	word-break: normal;
	overflow-wrap: anywhere;
	line-break: strict;
}
/* 見出し系は可能な限り意味の固まりで折り返す */
h1, h2, h3, h4, h5, h6,
.section-heading,
.page-hero__title,
.philosophy__main,
.hero__copy,
.second-view__lead,
.second-view__highlight {
	text-wrap: balance;
	word-break: keep-all;
	overflow-wrap: break-word;
	line-break: strict;
}
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; transition: color var(--dur-1) var(--ease); }
a:hover { color: var(--c-brand); }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul, ol { padding: 0; margin: 0; list-style: none; }
h1, h2, h3, h4, h5, h6, p { margin: 0; }

/* ---------- accessibility ---------- */
@media (prefers-reduced-motion: reduce) {
	html { scroll-behavior: auto; }
	*, *::before, *::after {
		animation-duration: 0.01ms !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.01ms !important;
	}
}
.visually-hidden {
	position: absolute !important;
	width: 1px; height: 1px;
	overflow: hidden; clip: rect(1px, 1px, 1px, 1px);
	white-space: nowrap;
}
/* PC 限定改行 / SP 限定改行 */
.is-pc-only { display: none; }
.is-sp-only { display: inline; }
@media (min-width: 768px) {
	.is-pc-only { display: inline; }
	.is-sp-only { display: none; }
}

/* ---------- layout ---------- */
.l-container {
	width: 100%;
	max-width: var(--container);
	margin-inline: auto;
	padding-inline: var(--gutter);
}
.l-narrow {
	max-width: 880px;
}
.l-wide {
	max-width: 1440px;
}

/* ---------- typography helpers ---------- */
.is-display { font-family: var(--ff-display); letter-spacing: 0.04em; }
.is-jp      { font-family: var(--ff-jp); }
.is-mute    { color: var(--c-mute); }

.section-eyebrow {
	display: inline-block;
	font-family: var(--ff-display);
	font-size: clamp(0.78rem, 0.35vw + 0.7rem, 0.88rem);
	letter-spacing: 0.32em;
	text-transform: uppercase;
	color: var(--c-mute);
	margin-bottom: 0.6em;
}
.section-heading {
	font-family: var(--ff-display);
	font-size: clamp(1.7rem, 2.4vw + 0.9rem, 2.6rem);
	font-weight: 700;
	letter-spacing: 0.08em;
	line-height: 1.2;
	color: var(--c-ink);
	text-wrap: balance;
}
.section-heading__sub {
	display: block;
	font-size: clamp(0.78rem, 0.3vw + 0.7rem, 0.85rem);
	font-family: var(--ff-jp);
	font-weight: 400;
	letter-spacing: 0.18em;
	color: var(--c-mute);
	margin-top: 0.5em;
}

/* ---------- buttons ---------- */
.c-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 0.6em;
	min-width: 200px;
	padding: 0.85em 1.5em;
	font-family: var(--ff-display);
	font-size: clamp(0.78rem, 0.3vw + 0.7rem, 0.85rem);
	font-weight: 600;
	letter-spacing: 0.18em;
	color: var(--c-ink);
	background: transparent;
	border: 1px solid var(--c-ink);
	border-radius: 0;
	transition: background var(--dur-1) var(--ease), color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease);
	text-transform: uppercase;
}
.c-btn:hover {
	background: var(--c-ink);
	color: var(--c-on-dark);
}
.c-btn--brand {
	color: var(--c-brand);
	border-color: var(--c-brand);
}
.c-btn--brand:hover {
	background: var(--c-brand);
	color: #fff;
}
.c-btn--filled {
	color: #fff;
	background: var(--c-brand);
	border-color: var(--c-brand);
}
.c-btn--filled:hover {
	background: var(--c-brand-dark);
	border-color: var(--c-brand-dark);
}
.c-btn__arrow {
	display: inline-block;
	width: 1.1em; height: 1px;
	background: currentColor;
	position: relative;
	transition: transform var(--dur-1) var(--ease);
}
.c-btn__arrow::after {
	content: "";
	position: absolute; right: 0; top: 50%;
	width: 0.5em; height: 1px;
	background: currentColor;
	transform-origin: right center;
	transform: translateY(-50%) rotate(35deg);
}
.c-btn:hover .c-btn__arrow { transform: translateX(4px); }

/* ---------- common section spacing ---------- */
.l-section {
	padding-block: clamp(4rem, 8vw, 7rem);
}
.l-section--tight {
	padding-block: clamp(2.5rem, 5vw, 4rem);
}
.l-section--dark {
	background: var(--c-ink);
	color: var(--c-on-dark);
}
.l-section--soft {
	background: var(--c-bg-soft);
}

/* ---------- fade-up util (animations.js が反応) ---------- */
.fade-up {
	opacity: 0;
	transform: translateY(28px);
	transition: opacity var(--dur-3) var(--ease), transform var(--dur-3) var(--ease);
	will-change: opacity, transform;
}
.fade-up.is-in {
	opacity: 1;
	transform: translateY(0);
}
.fade-up--d1 { transition-delay: 0.15s; }
.fade-up--d2 { transition-delay: 0.28s; }
.fade-up--d3 { transition-delay: 0.42s; }

/* ---------- main wrapper ---------- */
.site-main {
	min-height: 60vh;
}
.site-main--has-hero {
	margin-top: 0;
}

/* ---------- breadcrumb（パンくず・フッター直前に配置） ---------- */
.l-breadcrumb-bar {
	border-top: 1px solid var(--c-line-soft);
	background: var(--c-bg-soft);
	padding: 0.9rem 0;
}
.l-breadcrumb {
	font-size: clamp(0.68rem, 0.2vw + 0.62rem, 0.74rem);
	color: var(--c-mute);
	letter-spacing: 0.06em;
	display: inline-flex;
	flex-wrap: wrap;
	gap: 0.4em 0.5em;
	align-items: center;
}
.l-breadcrumb a {
	color: var(--c-mute);
	transition: color var(--dur-1) var(--ease);
}
.l-breadcrumb a:hover { color: var(--c-brand); }
.l-breadcrumb__sep {
	color: var(--c-line);
	font-family: var(--ff-display);
}
.l-breadcrumb [aria-current="page"] { color: var(--c-ink-soft); }
@media (max-width: 600px) {
	.l-breadcrumb-bar { padding-block: 0.55rem; }
	.l-breadcrumb { font-size: 0.66rem; }
}