/* ==========================================================================
   NAGASAKA LAB — Design Tokens
   デジタル庁デザインシステムを参考に、Noto Sans JP中心・太さは400/700のみ・
   派手な発光やグラデーションを使わない、誠実で読みやすいトーンにしている。
   ========================================================================== */
:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f4f5f7;
  --color-bg-card: #ffffff;
  --color-ink: #1a1a1a;
  --color-ink-soft: #46474c;
  --color-muted: #6e6f76;
  --color-line: #dcdee3;

  --color-navy: #1b3a6b;
  --color-navy-hover: #142c52;
  --color-navy-deep: #10233f;
  --color-navy-tint: #e9eef8;
  --color-navy-light: #9db8e8;   /* 濃い背景の上でのみ使用 */
  --color-navy-mid: #5f86cd;     /* 白背景の上で使用（コントラスト3.6:1） */

  --color-accent: var(--color-navy);
  --color-accent-ink: #ffffff;
  --color-focus: #ffc800;

  --font-latin: 'Noto Sans JP', sans-serif;
  --font-body: 'Noto Sans JP', sans-serif;

  --container-w: 1160px;
  --gap-section: clamp(64px, 9vw, 128px);
  --radius: 8px;
  --radius-pill: 999px;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   Reset
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
picture { display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p, dl, dd, figure, blockquote { margin: 0; }
button { font: inherit; cursor: pointer; }
input, textarea { font: inherit; }

@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;
    scroll-behavior: auto !important;
  }
}

.container {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 40px);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-navy);
  color: #fff;
  padding: 12px 20px;
  z-index: 200;
  font-weight: 700;
}
.skip-link:focus { left: 12px; top: 12px; }

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

/* ==========================================================================
   Reveal-on-scroll
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ==========================================================================
   Typography helpers
   ========================================================================== */
.section-label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-navy);
  margin-bottom: 14px;
}

.section-title {
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1.45;
  margin-bottom: 28px;
}

.section-sub {
  font-size: 16px;
  color: var(--color-ink-soft);
  max-width: 640px;
  margin-bottom: 48px;
}

.lead-text {
  font-size: 16px;
  color: var(--color-ink-soft);
  max-width: 680px;
  margin-bottom: 24px;
}

.accent-text { color: var(--color-navy); font-weight: 700; }

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 15px 28px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 15px;
  border: 1px solid transparent;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
  white-space: nowrap;
}
.btn-accent { background: var(--color-navy); color: #fff; }
.btn-accent:hover { background: var(--color-navy-hover); }
.btn-outline { border-color: var(--color-navy); color: var(--color-navy); }
.btn-outline:hover { background: var(--color-navy-tint); }
.btn-small { padding: 10px 18px; font-size: 13px; }
.btn-large { padding: 18px 36px; font-size: 16px; }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--color-line);
  transition: box-shadow 0.2s var(--ease);
}
.site-header.is-scrolled {
  box-shadow: 0 2px 10px rgba(16, 35, 63, 0.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 7px;
}
.logo-text {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--color-ink);
}
.main-nav ul { display: flex; gap: 32px; }
.main-nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink-soft);
  transition: color 0.2s;
}
.main-nav a:hover { color: var(--color-navy); }
.header-actions { display: flex; align-items: center; gap: 16px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  margin-right: -9px; /* タップ領域を広げても見た目の位置は変えない */
  background: none;
  border: none;
  padding: 0;
}
.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-ink);
  transition: transform 0.25s var(--ease), opacity 0.25s var(--ease);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-nav {
  background: #fff;
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}
.mobile-nav ul { padding: 8px 0; }
.mobile-nav a {
  display: block;
  padding: 16px clamp(20px, 5vw, 40px);
  color: var(--color-ink);
  font-size: 15px;
  border-bottom: 1px solid var(--color-line);
}
.mobile-nav-cta { color: var(--color-navy) !important; font-weight: 700; }

@media (max-width: 860px) {
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
  .header-actions .btn-small { display: none; }
}

/* モバイルメニューを開いている間は背面のページをスクロールさせない */
body.is-nav-open { overflow: hidden; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: var(--color-bg-alt);
  color: var(--color-ink);
  padding-block: 152px 96px;
}
.hero-inner {
  /* .hero は flex-direction: column。その中では margin-inline: auto を持つ子要素が
     引き伸ばされず内容幅に縮んでしまうため、明示的に幅を指定する。
     （.container の max-width: 1160px と margin-inline: auto はそのまま効く） */
  width: 100%;
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}
/* .hero-title のフォントサイズをこの要素の幅に連動させるための基準点 */
.hero-copy { container-type: inline-size; min-width: 0; }

.hero-media {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-navy-tint);
  border-radius: 24px;
  padding: clamp(24px, 4vw, 48px);
  min-width: 0;
}
.hero-media img { width: 100%; height: auto; min-width: 0; }

@media (max-width: 880px) {
  .hero { padding-block: 96px 64px; }
  .hero-inner { grid-template-columns: 1fr; gap: 32px; }
  .hero-media {
    order: -1;
    width: 100%;
    max-width: 420px;
    margin-inline: auto;
  }
}

.eyebrow {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-navy);
  margin-bottom: 24px;
}
.hero-title {
  font-weight: 700;
  /* 最長行「仕事の「ちょっと困った」を、」は14文字。これが1行に収まるサイズなら、
     どの画面幅でも原文どおりの3行に収まる。
     Heroは広い画面で2カラムになり本文カラムはビューポートより狭くなるため、
     vw ではなく親（.hero-copy）の幅に連動させている。
     14文字ぶんは 100cqw ÷ 14 ≒ 7.1cqw なので、余裕を見て 6.9cqw。 */
  font-size: clamp(20px, 6.9cqw, 44px);
  line-height: 1.55;
  max-width: 900px;
  margin-bottom: 28px;
}
/* 見出しの各フレーズは inline-block にして、語の途中で折り返させない。
   狭い画面では「デザインも、／Webも、AIも。」のようにフレーズ単位で改行される。 */
.hero-title span { display: inline-block; }
.hero-lead {
  font-size: 16px;
  color: var(--color-ink-soft);
  max-width: 620px;
  margin-bottom: 40px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 48px; }

.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.hero-tags li {
  font-size: 13px;
  padding: 9px 16px;
  background: var(--color-navy-tint);
  border-radius: 999px;
  color: var(--color-navy);
  font-weight: 500;
}

.pc-only { display: inline; }
.mobile-only { display: none; }
@media (max-width: 640px) {
  .pc-only { display: none; }
  .mobile-only { display: inline; }
}

/* ==========================================================================
   Section base
   ========================================================================== */
.section {
  padding-block: var(--gap-section);
}
.section-alt { background: var(--color-bg-alt); }

.philosophy {
  font-weight: 700;
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.65;
  padding: 32px clamp(20px, 4vw, 48px);
  border-top: 2px solid var(--color-navy);
  border-bottom: 2px solid var(--color-navy);
  margin-block: 40px;
}

/* ==========================================================================
   Services
   ========================================================================== */
.service-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
}
.service-card {
  background: #fff;
  padding: clamp(28px, 3vw, 44px);
}
.service-index {
  color: var(--color-navy);
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 20px;
}
.service-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin-bottom: 12px;
}
.service-copy { font-weight: 700; margin-bottom: 12px; color: var(--color-ink); }
.service-desc { color: var(--color-ink-soft); margin-bottom: 20px; font-size: 15px; }
.service-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.service-tags li {
  font-size: 12px;
  padding: 6px 12px;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  color: var(--color-muted);
}

@media (max-width: 720px) {
  .service-grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Works
   ========================================================================== */
.works-list { display: flex; flex-direction: column; gap: 88px; }
.work-case {
  display: grid;
  grid-template-columns: minmax(0, 360px) minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}
/* 左右を入れ替える回。order だけを反転させると本文が画像用の狭い列に
   入ってしまうため、列幅の指定もあわせて入れ替える。 */
.work-case-reverse {
  grid-template-columns: minmax(0, 1fr) minmax(0, 360px);
}
.work-case-reverse .work-media { order: 2; }
.work-case-reverse .work-body { order: 1; }

.work-media {
  width: 100%;
  max-width: 360px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
}
.work-case-reverse .work-media { margin-left: auto; }
.work-media img { width: 100%; height: auto; display: block; }

/* 日本語の読みやすい行長は35〜40字程度。制限しないと1行が50字近くまで伸びる。 */
.work-body { max-width: 40em; }

.work-client {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-muted);
  margin-bottom: 16px;
}
.work-detail { display: flex; flex-direction: column; gap: 20px; }
.work-detail dt {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #fff;
  background: var(--color-navy);
  display: inline-block;
  padding: 3px 10px;
  border-radius: 3px;
  margin-bottom: 8px;
}
.work-detail dd { color: var(--color-ink-soft); font-size: 15.5px; }

@media (max-width: 780px) {
  .work-case, .work-case-reverse { grid-template-columns: 1fr; }
  .work-case-reverse .work-media, .work-case-reverse .work-body { order: initial; }
}

/* ==========================================================================
   Capabilities
   ========================================================================== */
.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.capability-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border-radius: var(--radius);
  padding: 28px;
}
.capability-problem {
  font-size: 15px;
  color: var(--color-ink-soft);
  padding-bottom: 16px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--color-line);
}
.capability-answer-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.capability-arrow { color: var(--color-navy); font-weight: 700; flex-shrink: 0; }
.capability-answer { font-weight: 700; font-size: 15px; color: var(--color-ink); }

@media (max-width: 900px) {
  .capability-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .capability-grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Process
   ========================================================================== */
.process-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
}
.process-item { background: var(--color-bg); padding: 32px 24px; }
.process-index {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-navy-mid);
  margin-bottom: 20px;
}
.process-title { font-size: 18px; font-weight: 700; margin-bottom: 12px; }
.process-desc { font-size: 14.5px; color: var(--color-ink-soft); }

@media (max-width: 900px) {
  .process-list { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .process-list { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Pricing
   ========================================================================== */
.pricing-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 40px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
}
.pricing-item { background: var(--color-bg); padding: 32px 24px; }
.pricing-title {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 12px;
  padding-left: 16px;
  border-left: 3px solid var(--color-navy);
  line-height: 1.6;
}
.pricing-desc { font-size: 14.5px; color: var(--color-ink-soft); margin: 0; }
.pricing-note { font-size: 14.5px; color: var(--color-ink-soft); margin-top: 24px; }
.pricing-note a { color: var(--color-navy); font-weight: 700; text-decoration: underline; }

@media (max-width: 900px) {
  .pricing-list { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Profile
   ========================================================================== */
.profile-inner {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: start;
}
.profile-media {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  border-radius: 24px;
  padding: clamp(20px, 3vw, 36px);
  min-width: 0;
}
.profile-media img { width: 100%; height: auto; min-width: 0; }
.profile-points { display: flex; flex-direction: column; gap: 14px; margin-bottom: 32px; }
.profile-points li {
  padding-left: 24px;
  position: relative;
  color: var(--color-ink-soft);
  font-size: 15.5px;
}
.profile-points li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--color-navy);
}
.profile-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  border-top: 1px solid var(--color-line);
  padding-top: 24px;
}
.profile-card > div { display: grid; grid-template-columns: 100px 1fr; gap: 12px; }
.profile-card dt { font-size: 13px; color: var(--color-muted); font-weight: 700; }
.profile-card dd { font-size: 14.5px; color: var(--color-ink-soft); }
.profile-note { margin-top: 20px; font-size: 13px; color: var(--color-muted); }

@media (max-width: 780px) {
  .profile-inner { grid-template-columns: 1fr; }
  .profile-media { max-width: 420px; margin-inline: auto; }
}

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq-list { border-top: 1px solid var(--color-line); }
.faq-item {
  border-bottom: 1px solid var(--color-line);
  padding-block: 4px;
}
.faq-item summary {
  cursor: pointer;
  list-style: none;
  padding: 22px 4px;
  font-weight: 700;
  font-size: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  color: var(--color-ink);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  font-size: 22px;
  font-weight: 400;
  color: var(--color-navy);
  flex-shrink: 0;
  transition: transform 0.25s var(--ease);
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { padding: 0 4px 24px; color: var(--color-ink-soft); font-size: 15px; max-width: 680px; }

/* ==========================================================================
   Contact
   ========================================================================== */
.contact-inner { max-width: 720px; }
.contact-form { display: flex; flex-direction: column; gap: 24px; margin-top: 40px; }
.form-row { display: flex; flex-direction: column; gap: 8px; }
.form-row-group { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.form-row label, .form-row legend {
  font-size: 14px;
  font-weight: 700;
  padding: 0;
}
.required {
  font-size: 11px;
  font-weight: 700;
  color: #fff;
  background: var(--color-navy);
  padding: 2px 8px;
  border-radius: 999px;
  margin-left: 4px;
}
.form-row input[type="text"],
.form-row input[type="email"],
.form-row input[type="tel"],
.form-row textarea {
  border: 1px solid var(--color-line);
  background: #fff;
  border-radius: var(--radius);
  padding: 14px 16px;
  font-size: 15px;
  color: var(--color-ink);
  transition: border-color 0.2s;
}
.form-row input:focus, .form-row textarea:focus {
  border-color: var(--color-navy);
  outline: none;
}
.checkbox-grid { display: flex; flex-direction: column; gap: 4px; margin-top: 4px; }
.checkbox-item { display: flex; align-items: center; gap: 10px; min-height: 44px; font-size: 14.5px; font-weight: 400; cursor: pointer; }
.checkbox-item input { flex: none; width: 20px; height: 20px; accent-color: var(--color-navy); }

.form-status {
  display: none;
  font-size: 14px;
  font-weight: 700;
  padding: 14px 16px;
  border-radius: var(--radius);
}
.form-status.is-visible { display: block; }
.form-status.is-success { background: var(--color-navy-tint); color: var(--color-navy); }
.form-status.is-error { background: #fdecea; color: #a12a1c; }

@media (max-width: 600px) {
  .form-row-group { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Notice（/thanks/ 送信完了・404 など、1カラムの告知ページ共通）
   ========================================================================== */
.notice {
  /* ヘッダーが position: fixed のぶん、上に余白を足す */
  padding-top: calc(var(--gap-section) + 72px);
  min-height: 70vh;
}
.notice-inner { max-width: 720px; }
.notice-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px 8px 14px;
  border-radius: var(--radius-pill);
  background: var(--color-navy-tint);
  color: var(--color-navy);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.notice-badge-icon { flex: none; }
/* 404など、成功以外の告知で使う配色 */
.notice-badge-muted { background: var(--color-bg-alt); color: var(--color-ink-soft); }
.notice-title {
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1.5;
  margin: 24px 0 20px;
}
.notice-box {
  margin-top: 40px;
  padding: 28px;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
}
.notice-box-title {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 14px;
  padding-left: 14px;
  border-left: 3px solid var(--color-navy);
}
.notice-list { display: grid; gap: 10px; }
.notice-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  color: var(--color-ink-soft);
}
.notice-list a { color: var(--color-navy); font-weight: 700; text-decoration: underline; }
.notice-list li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-navy-mid);
}
.notice-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 40px;
}

@media (max-width: 560px) {
  .notice-box { padding: 22px 20px; }
  .notice-actions .btn { width: 100%; }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--color-navy-deep);
  color: #aab7cc;
  padding-block: 56px;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}
.footer-logo { display: flex; align-items: center; gap: 10px; }
.footer-brand .logo-text { font-weight: 700; color: #fff; font-size: 15px; }
.footer-tagline { font-size: 13px; margin-top: 6px; color: #8494ac; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 4px 20px; margin: -6px 0; }
.footer-nav a { display: inline-block; padding-block: 6px; font-size: 13.5px; transition: color 0.2s; }
.footer-nav a:hover { color: var(--color-navy-light); }
.footer-copy { width: 100%; font-size: 12px; color: #8794ad; text-align: center; margin-top: 24px; border-top: 1px solid #24365a; padding-top: 24px; }