/* ==========================================================================
   PitApp Corporate Site — Design System
   See AGENTS.md §7 for token policy.
   ========================================================================== */

:root {
	/* Color */
	--color-bg: #ffffff;
	--color-bg-soft: #fafaf7;
	--color-text: #1a1a1a;
	--color-text-soft: #555555;
	--color-border: #e5e5e5;
	--color-accent: #1a3a8c;
	--color-accent-hover: #0f2a6b;
	--color-accent-soft: #e8ecf5;

	/* Typography */
	--font-sans: 'Inter', 'Noto Sans JP', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
	--leading-base: 1.75;
	--leading-tight: 1.3;

	/* Spacing (8px base) */
	--space-1: 4px;
	--space-2: 8px;
	--space-3: 16px;
	--space-4: 24px;
	--space-5: 32px;
	--space-6: 48px;
	--space-7: 64px;
	--space-8: 96px;
	--space-9: 128px;

	/* Layout */
	--container-max: 1100px;
	--nav-height: 56px;

	/* Misc */
	--radius-sm: 2px;
	--transition-base: 200ms ease;
}

/* --------------------------------------------------------------------------
   Reset / Base
   -------------------------------------------------------------------------- */

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

html {
	scroll-behavior: smooth;
	-webkit-text-size-adjust: 100%;
	scroll-padding-top: var(--nav-height);
}

body {
	margin: 0;
	font-family: var(--font-sans);
	font-weight: 400;
	font-size: 16px;
	line-height: var(--leading-base);
	color: var(--color-text);
	background: var(--color-bg);
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
	margin: 0;
	font-weight: 600;
	line-height: var(--leading-tight);
	color: var(--color-text);
	text-wrap: balance;
	word-break: keep-all;
	overflow-wrap: anywhere;
}

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }
.prose p { text-wrap: pretty; }

a {
	color: var(--color-accent);
	text-decoration: underline;
	text-underline-offset: 3px;
	transition: color var(--transition-base);
}
a:hover { color: var(--color-accent-hover); }

a:focus-visible,
button:focus-visible {
	outline: 2px solid var(--color-accent);
	outline-offset: 2px;
	border-radius: var(--radius-sm);
}

img, svg { max-width: 100%; height: auto; display: block; }

ul, ol { margin: 0; padding: 0; }

button {
	font-family: inherit;
	font-size: inherit;
	color: inherit;
	background: transparent;
	border: 0;
	padding: 0;
	cursor: pointer;
}

iframe { max-width: 100%; border: 0; }

@media (prefers-reduced-motion: reduce) {
	html { scroll-behavior: auto; }
	*, *::before, *::after {
		transition-duration: 0ms !important;
		animation-duration: 0ms !important;
	}
}

/* --------------------------------------------------------------------------
   Layout helpers
   -------------------------------------------------------------------------- */

.container {
	max-width: var(--container-max);
	margin: 0 auto;
	padding-left: var(--space-4);
	padding-right: var(--space-4);
}

.section { padding: var(--space-7) 0; }
.section--soft { background: var(--color-bg-soft); }

@media (min-width: 1025px) {
	.section { padding: var(--space-8) 0; }
}

.section__head { margin-bottom: var(--space-6); }

.section__eyebrow {
	display: inline-block;
	font-size: 12px;
	font-weight: 600;
	letter-spacing: 0.15em;
	color: var(--color-accent);
	margin-bottom: var(--space-2);
}

.section__title {
	font-size: 28px;
	font-weight: 700;
	letter-spacing: -0.01em;
}

@media (min-width: 1025px) {
	.section__title { font-size: 36px; }
}

.section__lead {
	margin-top: var(--space-3);
	color: var(--color-text-soft);
	max-width: 720px;
	text-wrap: pretty;
	word-break: keep-all;
	overflow-wrap: anywhere;
}

@supports (word-break: auto-phrase) {
	.section__lead { word-break: auto-phrase; }
}

.skip-link {
	position: absolute;
	top: -40px;
	left: 0;
	padding: var(--space-2) var(--space-3);
	background: var(--color-accent);
	color: #fff;
	text-decoration: none;
	z-index: 100;
}
.skip-link:focus { top: 0; color: #fff; }

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */

.nav {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	height: var(--nav-height);
	background: rgba(255, 255, 255, 0.95);
	backdrop-filter: saturate(180%) blur(8px);
	-webkit-backdrop-filter: saturate(180%) blur(8px);
	border-bottom: 1px solid transparent;
	z-index: 50;
	transition: border-color var(--transition-base);
}
.nav.is-scrolled { border-bottom-color: var(--color-border); }

.nav__inner {
	max-width: var(--container-max);
	height: 100%;
	margin: 0 auto;
	padding: 0 var(--space-4);
	display: flex;
	align-items: center;
	justify-content: space-between;
}

.nav__brand {
	font-weight: 700;
	font-size: 15px;
	letter-spacing: 0.01em;
	color: var(--color-text);
	text-decoration: none;
}
.nav__brand:hover { color: var(--color-text); }

.nav__list {
	list-style: none;
	display: none;
	gap: var(--space-5);
}
.nav__list a {
	color: var(--color-text);
	text-decoration: none;
	font-size: 13px;
	font-weight: 500;
	letter-spacing: 0.05em;
}
.nav__list a:hover { color: var(--color-accent); }

.nav__toggle {
	display: inline-flex;
	width: 40px;
	height: 40px;
	align-items: center;
	justify-content: center;
}
.nav__toggle-bar,
.nav__toggle-bar::before,
.nav__toggle-bar::after {
	display: block;
	width: 22px;
	height: 2px;
	background: var(--color-text);
	transition: transform var(--transition-base), opacity var(--transition-base);
}
.nav__toggle-bar { position: relative; }
.nav__toggle-bar::before {
	content: '';
	position: absolute;
	top: -7px;
	left: 0;
}
.nav__toggle-bar::after {
	content: '';
	position: absolute;
	top: 7px;
	left: 0;
}
.nav__toggle[aria-expanded="true"] .nav__toggle-bar { background: transparent; }
.nav__toggle[aria-expanded="true"] .nav__toggle-bar::before {
	transform: translateY(7px) rotate(45deg);
}
.nav__toggle[aria-expanded="true"] .nav__toggle-bar::after {
	transform: translateY(-7px) rotate(-45deg);
}

.nav__panel { display: none; }
.nav__panel.is-open {
	display: block;
	position: absolute;
	top: var(--nav-height);
	left: 0;
	right: 0;
	background: var(--color-bg);
	border-bottom: 1px solid var(--color-border);
	padding: var(--space-3) 0;
}
.nav__panel.is-open .nav__list {
	display: flex;
	flex-direction: column;
	gap: 0;
}
.nav__panel.is-open .nav__list a {
	display: block;
	padding: var(--space-3) var(--space-4);
}

@media (min-width: 1025px) {
	.nav__panel,
	.nav__panel.is-open {
		display: block;
		position: static;
		background: transparent;
		border-bottom: 0;
		padding: 0;
	}
	.nav__panel.is-open .nav__list {
		flex-direction: row;
		gap: var(--space-5);
	}
	.nav__panel.is-open .nav__list a {
		display: inline;
		padding: 0;
	}
	.nav__list { display: flex; }
	.nav__toggle { display: none; }
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero {
	padding: calc(var(--nav-height) + var(--space-7)) 0 var(--space-8);
	background: var(--color-bg);
	position: relative;
	overflow: hidden;
}

.hero::before {
	content: '';
	position: absolute;
	right: -120px;
	top: 20%;
	width: 480px;
	height: 480px;
	background: var(--color-accent-soft);
	border-radius: 50%;
	opacity: 0.6;
	z-index: 0;
}

.hero__inner {
	position: relative;
	z-index: 1;
	max-width: var(--container-max);
	margin: 0 auto;
	padding: 0 var(--space-4);
	display: grid;
	gap: var(--space-6);
	grid-template-columns: 1fr;
	align-items: center;
}

@media (min-width: 769px) {
	.hero__inner {
		grid-template-columns: 1.15fr 1fr;
		gap: var(--space-7);
	}
}

.hero__text {
	display: flex;
	flex-direction: column;
	gap: var(--space-4);
	align-items: flex-start;
}

.hero__media {
	width: 100%;
	aspect-ratio: 4 / 5;
}

@media (min-width: 769px) {
	.hero__media {
		aspect-ratio: 3 / 4;
	}
}

.hero__eyebrow {
	font-size: 12px;
	font-weight: 600;
	letter-spacing: 0.2em;
	color: var(--color-accent);
}

.hero__title {
	font-size: 36px;
	font-weight: 700;
	letter-spacing: -0.02em;
	line-height: 1.15;
}
.hero__title > span { display: inline-block; }

.hero__lead {
	font-size: 16px;
	color: var(--color-text-soft);
	max-width: 640px;
}

.hero__cta {
	margin-top: var(--space-3);
	display: inline-flex;
	align-items: center;
	gap: var(--space-2);
	padding: var(--space-3) var(--space-5);
	background: var(--color-accent);
	color: #fff;
	text-decoration: none;
	font-weight: 600;
	font-size: 14px;
	letter-spacing: 0.05em;
	transition: background var(--transition-base);
}
.hero__cta:hover { background: var(--color-accent-hover); color: #fff; }

@media (min-width: 641px) {
	.hero__title { font-size: 44px; }
}
@media (min-width: 1025px) {
	.hero { padding: calc(var(--nav-height) + var(--space-9)) 0 var(--space-9); }
	.hero__title { font-size: 48px; }
	.hero::before { right: -80px; width: 560px; height: 560px; }
}

/* --------------------------------------------------------------------------
   Prose (narrow text column)
   -------------------------------------------------------------------------- */

.prose { max-width: 720px; }
.prose p + p { margin-top: var(--space-3); }

/* --------------------------------------------------------------------------
   Vision split (text + media)
   -------------------------------------------------------------------------- */

.vision-grid {
	display: grid;
	gap: var(--space-6);
	grid-template-columns: 1fr;
	align-items: center;
}

@media (min-width: 769px) {
	.vision-grid {
		grid-template-columns: 1.1fr 1fr;
		gap: var(--space-7);
	}
}

.vision__media {
	width: 100%;
	aspect-ratio: 4 / 3;
}

/* --------------------------------------------------------------------------
   Media (image wrapper with mono+blue tint)
   -------------------------------------------------------------------------- */

.media {
	position: relative;
	overflow: hidden;
	background: var(--color-accent-soft);
	margin: 0;
}

.media img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	display: block;
	filter: grayscale(20%) brightness(1.03) contrast(1.05);
}

.media::after {
	content: '';
	position: absolute;
	inset: 0;
	background: linear-gradient(135deg, rgba(26, 58, 140, 0.10), rgba(26, 58, 140, 0.02));
	mix-blend-mode: multiply;
	pointer-events: none;
}

/* --------------------------------------------------------------------------
   Develop — service list (3 cards)
   -------------------------------------------------------------------------- */

.serviceList {
	list-style: none;
	display: grid;
	gap: var(--space-4);
	grid-template-columns: 1fr;
}
@media (min-width: 769px) {
	.serviceList { grid-template-columns: repeat(3, 1fr); }
}

.service {
	padding: 0;
	border: 1px solid var(--color-border);
	background: var(--color-bg);
	transition: border-color var(--transition-base);
	display: flex;
	flex-direction: column;
	overflow: hidden;
}
.service:hover { border-color: var(--color-accent); }

.service__media {
	width: 100%;
	aspect-ratio: 16 / 10;
}

.service__body-wrap {
	padding: var(--space-5);
	display: flex;
	flex-direction: column;
	flex: 1;
}

.service__num {
	font-size: 12px;
	font-weight: 600;
	letter-spacing: 0.15em;
	color: var(--color-accent);
}

.service__title {
	margin: var(--space-2) 0 var(--space-3);
	font-size: 20px;
	font-weight: 700;
}

.service__body {
	font-size: 14px;
	color: var(--color-text-soft);
}

/* --------------------------------------------------------------------------
   Research — publication list (ol)
   -------------------------------------------------------------------------- */

.researchList {
	list-style: none;
	counter-reset: research;
	display: grid;
	gap: var(--space-3);
}

.researchItem {
	position: relative;
	padding: var(--space-4) var(--space-4) var(--space-4) var(--space-7);
	background: var(--color-bg);
	border: 1px solid var(--color-border);
	counter-increment: research;
	transition: border-color var(--transition-base);
}
.researchItem:hover { border-color: var(--color-accent); }

.researchItem::before {
	content: counter(research, decimal-leading-zero);
	position: absolute;
	top: var(--space-4);
	left: var(--space-4);
	font-weight: 600;
	font-size: 12px;
	color: var(--color-accent);
	letter-spacing: 0.05em;
}

.researchItem cite {
	display: block;
	font-style: normal;
	font-weight: 600;
	font-size: 15px;
	color: var(--color-text);
	margin-bottom: var(--space-2);
	line-height: 1.4;
}

.researchItem .meta {
	display: block;
	font-size: 13px;
	color: var(--color-text-soft);
}

.researchItem .source {
	display: inline-block;
	margin-top: var(--space-2);
	font-size: 12px;
}

/* --------------------------------------------------------------------------
   Works — placeholder cards (industry × type, awaiting NDA-cleared cases)
   -------------------------------------------------------------------------- */

.workList {
	list-style: none;
	display: grid;
	gap: var(--space-3);
	grid-template-columns: 1fr;
}
@media (min-width: 481px) {
	.workList { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 769px) {
	.workList { grid-template-columns: repeat(3, 1fr); }
}

.work {
	padding: var(--space-5);
	background: var(--color-bg);
	border: 1px solid var(--color-border);
	display: flex;
	flex-direction: column;
	gap: var(--space-2);
	transition: border-color var(--transition-base);
}
.work:hover { border-color: var(--color-accent); }

.work__industry {
	display: inline-block;
	align-self: flex-start;
	padding: 2px var(--space-2);
	background: var(--color-accent-soft);
	color: var(--color-accent);
	font-size: 11px;
	font-weight: 600;
	letter-spacing: 0.1em;
}

.work__title {
	font-size: 16px;
	font-weight: 700;
	margin: 0;
}

.work__status {
	font-size: 12px;
	color: var(--color-text-soft);
	margin: 0;
	letter-spacing: 0.05em;
}

.work__meta {
	margin: var(--space-2) 0 0;
	font-size: 12px;
	display: grid;
	grid-template-columns: auto 1fr;
	gap: var(--space-1) var(--space-3);
	color: var(--color-text-soft);
}
.work__meta dt {
	font-weight: 600;
	color: var(--color-text);
}
.work__meta dd {
	margin: 0;
}

/* --------------------------------------------------------------------------
   Genre — 5 categories
   -------------------------------------------------------------------------- */

.genreGrid {
	list-style: none;
	display: grid;
	gap: var(--space-3);
	grid-template-columns: 1fr;
}
@media (min-width: 481px) {
	.genreGrid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 769px) {
	.genreGrid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 1025px) {
	.genreGrid { grid-template-columns: repeat(5, 1fr); }
}

.genre {
	padding: var(--space-5) var(--space-3);
	border: 1px solid var(--color-border);
	text-align: center;
	background: var(--color-bg);
	transition: border-color var(--transition-base);
}
.genre:hover { border-color: var(--color-accent); }

.genre__icon {
	width: 40px;
	height: 40px;
	margin: 0 auto var(--space-3);
	color: var(--color-accent);
}

.genre__title {
	font-size: 13px;
	font-weight: 700;
	letter-spacing: 0.1em;
	margin-bottom: var(--space-2);
}

.genre__body {
	font-size: 13px;
	color: var(--color-text-soft);
	line-height: 1.6;
	text-align: left;
}

.genre__cta {
	display: inline-block;
	margin-top: var(--space-3);
	color: var(--color-accent);
	font-size: 13px;
	font-weight: 600;
	letter-spacing: 0.05em;
	text-decoration: none;
}
.genre__cta:hover { color: var(--color-accent-hover); }

.genreFooter {
	margin-top: var(--space-6);
	text-align: center;
}

/* --------------------------------------------------------------------------
   Stacks — technology tag list (within Genre section)
   -------------------------------------------------------------------------- */

.stacks {
	margin-top: var(--space-6);
	padding-top: var(--space-5);
	border-top: 1px solid var(--color-border);
}

.stacks__title {
	font-size: 13px;
	font-weight: 700;
	letter-spacing: 0.1em;
	color: var(--color-accent);
	margin-bottom: var(--space-3);
	text-align: center;
}

.stacks__tags {
	list-style: none;
	display: flex;
	flex-wrap: wrap;
	gap: var(--space-2);
	justify-content: center;
}

.stacks__tags li {
	padding: var(--space-1) var(--space-3);
	font-size: 13px;
	font-weight: 500;
	color: var(--color-text);
	background: var(--color-bg);
	border: 1px solid var(--color-border);
}

/* --------------------------------------------------------------------------
   Request — centered narrow column
   -------------------------------------------------------------------------- */

.request { max-width: 720px; margin: 0 auto; }
.request p + p { margin-top: var(--space-3); }

/* --------------------------------------------------------------------------
   Profile — info + map, then form
   -------------------------------------------------------------------------- */

.profile {
	display: grid;
	gap: var(--space-6);
	grid-template-columns: 1fr;
}
@media (min-width: 1025px) {
	.profile { grid-template-columns: 1fr 1fr; align-items: start; }
}

.profile__info dl {
	margin: 0;
	display: grid;
	grid-template-columns: 1fr;
	gap: 0;
}

.profile__info dt {
	font-weight: 600;
	font-size: 12px;
	color: var(--color-accent);
	letter-spacing: 0.1em;
	padding-top: var(--space-3);
	border-top: 1px solid var(--color-border);
}
.profile__info dt:first-child { border-top: 0; padding-top: 0; }

.profile__info dd {
	margin: var(--space-1) 0 var(--space-3) 0;
	font-size: 14px;
}
.profile__info dd:last-child { margin-bottom: 0; }

.profile__map {
	width: 100%;
	height: 320px;
}
.profile__map iframe {
	width: 100%;
	height: 100%;
	border: 0;
}

.formWrap {
	margin-top: var(--space-7);
	max-width: 720px;
	margin-left: auto;
	margin-right: auto;
}

.contactForm {
	display: flex;
	flex-direction: column;
	gap: var(--space-4);
}

.contactForm__field {
	display: flex;
	flex-direction: column;
	gap: var(--space-1);
}

.contactForm__field label {
	font-size: 14px;
	font-weight: 600;
	color: var(--color-text);
}

.contactForm__req {
	display: inline-block;
	margin-left: var(--space-1);
	padding: 0 var(--space-1);
	font-size: 11px;
	font-weight: 600;
	color: var(--color-accent);
	background: var(--color-accent-soft);
	letter-spacing: 0.05em;
}

.contactForm input,
.contactForm textarea {
	width: 100%;
	padding: var(--space-3);
	font-family: inherit;
	font-size: 16px;
	line-height: 1.5;
	color: var(--color-text);
	background: var(--color-bg);
	border: 1px solid var(--color-border);
	border-radius: var(--radius-sm);
	transition: border-color var(--transition-base);
}
.contactForm input:focus,
.contactForm textarea:focus {
	border-color: var(--color-accent);
	outline: 2px solid var(--color-accent);
	outline-offset: 2px;
}

.contactForm textarea {
	resize: vertical;
	min-height: 140px;
}

.contactForm__submit {
	align-self: flex-start;
	margin-top: var(--space-2);
	padding: var(--space-3) var(--space-5);
	background: var(--color-accent);
	color: #fff;
	font-weight: 600;
	font-size: 14px;
	letter-spacing: 0.05em;
	border: 0;
	cursor: pointer;
	transition: background var(--transition-base);
}
.contactForm__submit:hover { background: var(--color-accent-hover); }
.contactForm__submit:disabled { opacity: 0.5; cursor: not-allowed; }

.contactForm__status {
	margin: 0;
	font-size: 14px;
	min-height: 1.5em;
}
.contactForm__status.is-success { color: var(--color-accent); font-weight: 600; }
.contactForm__status.is-error { color: #b3261e; font-weight: 600; }

.cf-turnstile { margin-top: var(--space-2); }

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.footer {
	border-top: 1px solid var(--color-border);
	padding: var(--space-5) 0;
	font-size: 12px;
	color: var(--color-text-soft);
	text-align: center;
}

.footer__inner {
	max-width: var(--container-max);
	margin: 0 auto;
	padding: 0 var(--space-4);
}