/* ===========================================================
   MOONARC — static site (Vercel) / ゴールド×ネイビー・月への弧
   =========================================================== */

:root {
	--base: #0E1525;
	--soft: #131C30;
	--contrast: #F5F7FB;
	--gold: #E9C46A;
	--gold-soft: #F2D58A;
	--line: color-mix(in srgb, var(--contrast) 14%, transparent);
	--wrap: 1140px;
}

* { box-sizing: border-box; }

html {
	scroll-behavior: smooth;
}

body {
	margin: 0;
	background: var(--base);
	color: var(--contrast);
	font-family: 'Zen Kaku Gothic New', system-ui, -apple-system, 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', sans-serif;
	line-height: 1.75;
	-webkit-font-smoothing: antialiased;
}

h1, h2, h3 { letter-spacing: 0.01em; line-height: 1.3; }
a { color: var(--gold); }
img { max-width: 100%; }

.wrap {
	width: 100%;
	max-width: var(--wrap);
	margin-inline: auto;
	padding-inline: 1.5rem;
}
.wrap--narrow { max-width: 820px; }

/* ===== Brand lockup (L2-B) ===== */
.brand {
	display: inline-flex;
	align-items: center;
	gap: 0.6rem;
	text-decoration: none;
}
.brand__mark {
	width: 2.2em;
	height: 2.2em;
	filter: drop-shadow(0 0 8px rgba(233, 196, 106, 0.5));
}
.brand__name {
	font-weight: 800;
	letter-spacing: 0.12em;
	font-size: 1.15rem;
	color: var(--contrast);
}
.brand__arc { color: var(--gold); }

/* ===== Sticky header ===== */
.hdr {
	position: sticky;
	top: 0;
	z-index: 100;
	padding-block: 0.7rem;
	background: color-mix(in srgb, var(--base) 70%, transparent);
	backdrop-filter: blur(10px);
	-webkit-backdrop-filter: blur(10px);
	border-bottom: 1px solid transparent;
	transition: background 0.25s ease, border-color 0.25s ease;
}
.hdr.is-stuck {
	background: color-mix(in srgb, var(--base) 92%, transparent);
	border-bottom-color: color-mix(in srgb, var(--gold) 16%, transparent);
}
.hdr__bar {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 1rem;
}
.nav {
	display: flex;
	align-items: center;
	gap: 1.5rem;
	flex-wrap: wrap;
	justify-content: flex-end;
}
.nav a {
	color: var(--contrast);
	text-decoration: none;
	font-size: 0.95rem;
	opacity: 0.82;
	transition: opacity 0.18s ease, color 0.18s ease;
}
.nav a:hover { opacity: 1; color: var(--gold); }
.nav__cta {
	background: var(--gold);
	color: var(--base) !important;
	padding: 0.5rem 1.15rem;
	border-radius: 999px;
	font-weight: 700;
	opacity: 1 !important;
}
.nav__cta:hover { filter: brightness(1.06); }

/* ===== Buttons ===== */
.btn {
	display: inline-block;
	background: var(--gold);
	color: var(--base);
	font-weight: 700;
	text-decoration: none;
	padding: 0.7rem 1.7rem;
	border-radius: 999px;
	border: 1px solid var(--gold);
	transition: transform 0.16s ease, filter 0.16s ease;
}
.btn:hover { transform: translateY(-2px); filter: brightness(1.05); }
.btn--outline {
	background: transparent;
	color: var(--contrast);
	border-color: color-mix(in srgb, var(--gold) 60%, transparent);
}

/* ===== Sections ===== */
.section {
	padding-block: clamp(3.5rem, 8vw, 6rem);
	scroll-margin-top: 70px;
}
.section--soft { background: var(--soft); }
.head {
	text-align: center;
	max-width: 42rem;
	margin-inline: auto;
	margin-bottom: clamp(2rem, 5vw, 3.2rem);
}
.eyebrow {
	color: var(--gold);
	font-weight: 700;
	letter-spacing: 0.14em;
	font-size: 0.78rem;
	margin: 0 0 0.6rem;
}
.h2 {
	font-size: clamp(1.7rem, 3.6vw, 2.5rem);
	font-weight: 800;
	margin: 0;
}
.lead { opacity: 0.76; margin: 1rem 0 0; }

/* ===== Hero ===== */
.hero {
	position: relative;
	overflow: hidden;
	padding-block: clamp(3.5rem, 9vw, 6.5rem);
}
.hero__arc {
	position: absolute;
	top: 0;
	right: 0;
	width: min(1180px, 116%);
	pointer-events: none;
	z-index: 0;
}
.hero__arc svg { width: 100%; height: auto; display: block; }
.hero__inner { position: relative; z-index: 1; max-width: 720px; }
.hero__title {
	font-size: clamp(2.4rem, 5.4vw, 3.8rem);
	font-weight: 800;
	line-height: 1.2;
	margin: 0 0 1rem;
}
.hero__lead { max-width: 36em; opacity: 0.9; margin: 0 0 1.8rem; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 0.8rem; }
.hero__points {
	list-style: none;
	display: flex;
	flex-wrap: wrap;
	gap: 0.6rem;
	padding: 0;
	margin: 1.7rem 0 0;
}
.hero__points li {
	font-size: 0.8rem;
	border: 1px solid color-mix(in srgb, var(--gold) 40%, transparent);
	border-radius: 999px;
	padding: 0.35rem 0.9rem 0.35rem 1.7rem;
	position: relative;
	opacity: 0.9;
}
.hero__points li::before {
	content: "";
	position: absolute;
	left: 0.75rem;
	top: 50%;
	transform: translateY(-50%);
	width: 6px;
	height: 6px;
	border-radius: 50%;
	background: var(--gold);
	box-shadow: 0 0 6px rgba(233, 196, 106, 0.8);
}

/* ===== Business cards ===== */
.cards {
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: 1.25rem;
}
.card {
	border: 1px solid var(--line);
	border-radius: 14px;
	padding: 1.75rem;
	background: color-mix(in srgb, var(--base) 94%, var(--contrast));
	transition: transform 0.18s ease, border-color 0.18s ease;
}
.card:hover {
	transform: translateY(-3px);
	border-color: color-mix(in srgb, var(--gold) 60%, transparent);
}
.card__ic { display: inline-flex; color: var(--gold); margin-bottom: 0.9rem; }
.card__ic svg { width: 30px; height: 30px; }
.card__label {
	font-size: 0.78rem;
	letter-spacing: 0.08em;
	color: var(--gold);
	margin: 0 0 0.3rem;
}
.card h3 { margin: 0 0 0.5rem; font-size: 1.35rem; }
.card p { opacity: 0.82; font-size: 0.94rem; margin: 0; }

/* ===== Approach (numbered) ===== */
.reasons {
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: 1.5rem;
}
.reason__no {
	display: block;
	font-size: 2.3rem;
	font-weight: 800;
	line-height: 1;
	color: var(--gold);
	opacity: 0.55;
	margin-bottom: 0.5rem;
}
.reason h3 { font-size: 1.2rem; margin: 0 0 0.4rem; }
.reason p { font-size: 0.9rem; opacity: 0.74; margin: 0; }

/* ===== FAQ ===== */
.faq { display: flex; flex-direction: column; gap: 0.75rem; }
.faq details {
	border: 1px solid var(--line);
	border-radius: 12px;
	background: color-mix(in srgb, var(--base) 94%, var(--contrast));
	overflow: hidden;
}
.faq summary {
	cursor: pointer;
	padding: 1rem 2.8rem 1rem 1.2rem;
	font-weight: 700;
	list-style: none;
	position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
	content: "+";
	position: absolute;
	right: 1.2rem;
	top: 50%;
	transform: translateY(-50%);
	color: var(--gold);
	font-size: 1.35rem;
	line-height: 1;
}
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 0; padding: 0 1.2rem 1.1rem; opacity: 0.8; font-size: 0.94rem; }

/* ===== Contact / CTA ===== */
.cta { text-align: center; }
.cta .lead { margin-inline: auto; }
.form { text-align: left; margin-top: 1.8rem; }
.form label { display: block; margin: 1rem 0 0.35rem; font-size: 0.9rem; opacity: 0.85; }
.form input, .form textarea {
	width: 100%;
	padding: 0.7rem 0.9rem;
	border: 1px solid color-mix(in srgb, var(--contrast) 20%, transparent);
	border-radius: 10px;
	background: color-mix(in srgb, var(--base) 88%, var(--contrast));
	color: var(--contrast);
	font: inherit;
}
.form__actions { text-align: center; margin: 1.3rem 0 0; }
.form__submit { cursor: not-allowed; }
.form__note { font-size: 0.8rem; opacity: 0.62; text-align: center; margin: 0.6rem 0 0; }

/* ===== Footer ===== */
.ftr {
	padding-block: 2.5rem;
	border-top: 1px solid var(--line);
}
.ftr__bar {
	display: flex;
	align-items: center;
	justify-content: space-between;
	flex-wrap: wrap;
	gap: 1rem;
}
.ftr__nav { display: flex; flex-wrap: wrap; gap: 1.2rem; }
.ftr__nav a { color: var(--contrast); opacity: 0.8; text-decoration: none; font-size: 0.9rem; }
.ftr__nav a:hover { opacity: 1; color: var(--gold); }
.ftr__copy { max-width: var(--wrap); margin: 1.4rem auto 0; padding-inline: 1.5rem; font-size: 0.8rem; opacity: 0.55; }

/* ===== Scroll reveal (JS有効時のみ隠す) ===== */
.js [data-reveal] {
	opacity: 0;
	transform: translateY(16px);
	transition: opacity 0.6s ease, transform 0.6s ease;
}
.js [data-reveal].is-revealed { opacity: 1; transform: none; }

/* ===== Responsive ===== */
@media (max-width: 920px) {
	.cards, .reasons { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 781px) {
	.nav a:not(.nav__cta) { display: none; }
}
@media (max-width: 560px) {
	.cards, .reasons { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
	html { scroll-behavior: auto; }
	.js [data-reveal] { opacity: 1; transform: none; transition: none; }
}