/* ===========================================================
   iCoRPプロジェクト Webサイトテンプレート
   デジタル庁デザインシステムを参考にした、緑を基調とする
   読みやすさ・アクセシビリティ重視のシンプルなスタイル
   =========================================================== */

:root {
  /* Colors */
  --color-primary: #0b7b4b;
  --color-primary-dark: #075c38;
  --color-primary-darker: #054027;
  --color-primary-light: #e6f4ec;
  --color-primary-lighter: #f2faf5;
  --color-text: #1a1a1a;
  --color-text-secondary: #4b5563;
  --color-text-muted: #6b7280;
  --color-border: #e2e8e4;
  --color-border-strong: #cdd7d1;
  --color-bg: #ffffff;
  --color-bg-alt: #f5f9f6;
  --color-white: #ffffff;
  --color-focus: #0b5cff;

  /* Typography */
  --font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Hiragino Sans",
    "Yu Gothic", Meiryo, sans-serif;
  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: 1.375rem;
  --fs-xl: 1.75rem;
  --fs-2xl: 2.25rem;
  --fs-3xl: 2.75rem;
  --line-height-base: 1.8;

  /* Layout */
  --max-width: 1120px;
  --gutter: 24px;
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 20, 0.08);
  --shadow-md: 0 4px 16px rgba(15, 23, 20, 0.1);
  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-family);
  font-size: var(--fs-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-primary-dark);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

h1,
h2,
h3,
h4 {
  line-height: 1.4;
  margin: 0 0 0.75em;
  font-weight: 700;
}

p {
  margin: 0 0 1em;
}

button {
  font-family: inherit;
}

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

/* ---------- Layout helpers ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--gutter);
}

.section {
  padding: 64px 0;
}

.section-alt {
  background-color: var(--color-bg-alt);
}

.section-header {
  grid-column: 1 / -1;
  max-width: 720px;
  margin-bottom: 40px;
}

.section-header.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--color-primary-dark);
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.section-title {
  font-size: var(--fs-2xl);
  color: var(--color-text);
}

.section-lead {
  color: var(--color-text-secondary);
  font-size: var(--fs-md);
  margin: 0;
}

/* 読みやすい行長に抑えた本文ブロック（スマートフォンでは全幅） */
.prose {
  grid-column: 1 / span 8;
}

.section-footer-link {
  grid-column: 1 / -1;
  margin-top: 32px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 999px;
  font-weight: 700;
  font-size: var(--fs-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease,
    border-color 0.15s ease, transform 0.1s ease;
  white-space: nowrap;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  color: var(--color-white);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
}

.btn-outline:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary-darker);
}

.btn-block {
  width: 100%;
  justify-content: center;
}

.btn-arrow::after {
  content: "→";
  transition: transform 0.15s ease;
}

.btn-arrow:hover::after {
  transform: translateX(3px);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.site-title {
  font-size: var(--fs-md);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.01em;
}

.site-title:hover {
  color: var(--color-primary-dark);
  text-decoration: none;
}

.site-title strong {
  color: var(--color-primary-dark);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-list a {
  color: var(--color-text);
  font-weight: 500;
  font-size: var(--fs-sm);
  padding: 8px 2px;
  border-bottom: 2px solid transparent;
}

.nav-list a:hover,
.nav-list a[aria-current="page"] {
  color: var(--color-primary-dark);
  border-bottom-color: var(--color-primary);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 0 auto;
  background-color: var(--color-text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Hero ---------- */
.hero {
  padding: 72px 0 64px;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
}

.hero-content {
  grid-column: 1 / -1;
}

.hero-title {
  font-size: var(--fs-3xl);
  color: var(--color-text);
}

.hero-title .accent {
  color: var(--color-primary-dark);
}

.hero-lead {
  font-size: var(--fs-md);
  color: var(--color-text-secondary);
  max-width: 640px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 28px;
  flex-wrap: wrap;
}

@media (min-width: 769px) {
  .hero-content {
    grid-column: 1 / span 7;
  }
}

/* ---------- Cards ---------- */
.card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  height: 100%;
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}

/* タップ操作の端末ではホバー演出が残らないよう、マウス操作時のみ適用 */
@media (hover: hover) {
  .card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
  }
}

.card-date {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  font-weight: 700;
  letter-spacing: 0.03em;
}

.card-title {
  font-size: var(--fs-base);
  margin: 8px 0;
}

.card-title a {
  color: var(--color-text);
}

.card-title a::after {
  content: "";
  position: absolute;
  inset: 0;
}

.card {
  position: relative;
}

.card-desc {
  color: var(--color-text-secondary);
  font-size: var(--fs-sm);
  margin: 0;
}

/* News list on home */
.news-grid > * {
  grid-column: span 3;
}

@media (max-width: 900px) {
  .news-grid > * {
    grid-column: span 6;
  }
}

@media (max-width: 560px) {
  .news-grid > * {
    grid-column: span 12;
  }
}

/* Overview cards (home summary sections) */
.overview-grid > * {
  grid-column: span 4;
}

@media (max-width: 900px) {
  .overview-grid > * {
    grid-column: span 12;
  }
}

.overview-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.overview-card .card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 16px;
  font-weight: 700;
}

.overview-card h3 {
  font-size: var(--fs-md);
}

.overview-card p {
  color: var(--color-text-secondary);
  font-size: var(--fs-sm);
  flex-grow: 1;
}

.overview-card .card-link {
  font-weight: 700;
  font-size: var(--fs-sm);
  color: var(--color-primary-dark);
}

/* ---------- Portfolio cards ---------- */
.portfolio-grid > * {
  grid-column: span 4;
}

@media (max-width: 900px) {
  .portfolio-grid > * {
    grid-column: span 6;
  }
}

@media (max-width: 560px) {
  .portfolio-grid > * {
    grid-column: span 12;
  }
}

.portfolio-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.portfolio-card[hidden] {
  display: none;
}

.portfolio-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-sm);
  font-weight: 700;
  overflow: hidden;
}

.portfolio-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.portfolio-card h3 {
  font-size: var(--fs-md);
  margin: 0;
}

.portfolio-card .portfolio-desc {
  color: var(--color-text-secondary);
  font-size: var(--fs-sm);
  margin: 0;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-size: var(--fs-xs);
  font-weight: 700;
}

.portfolio-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

.portfolio-meta .author {
  font-weight: 500;
  color: var(--color-text-secondary);
}

.portfolio-meta .links {
  display: flex;
  gap: 12px;
}

.portfolio-meta a {
  font-weight: 700;
  color: var(--color-primary-dark);
}

/* Portfolio tag filter */
.filter-bar {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.filter-btn {
  padding: 8px 20px;
  border-radius: 999px;
  border: 1px solid var(--color-border-strong);
  background-color: var(--color-white);
  color: var(--color-text-secondary);
  font-size: var(--fs-sm);
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease,
    border-color 0.15s ease;
}

.filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
}

.filter-btn.is-active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

.portfolio-empty {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--color-text-muted);
  padding: 48px 0;
}

/* 掲載内容がないときの案内表示（ポートフォリオの準備中・セッションの募集なし など） */
.coming-soon {
  grid-column: 1 / -1;
  text-align: center;
  padding: 64px 24px;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
}

.coming-soon-title {
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--color-primary-dark);
  margin: 0 0 12px;
}

.coming-soon-text {
  color: var(--color-text-secondary);
  margin: 0;
}

/* ---------- Seminar / Info panel ---------- */
.info-panel {
  grid-column: 1 / -1;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-sm);
}

.info-panel-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.status-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 999px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.03em;
}

.info-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 40px;
  margin-bottom: 32px;
}

@media (max-width: 640px) {
  .info-list {
    grid-template-columns: 1fr;
  }
}

.info-item dt {
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
  margin-bottom: 6px;
}

.info-item dd {
  margin: 0;
  font-size: var(--fs-md);
  font-weight: 500;
}

/* Past seminar list */
.record-list {
  grid-column: 1 / -1;
}

.record-row {
  display: flex;
  align-items: baseline;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

.record-row .record-date {
  flex: 0 0 140px;
  font-weight: 700;
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
}

.record-row .record-title {
  font-weight: 500;
}

/* ---------- Timeline (project history) ---------- */
.timeline {
  grid-column: 1 / -1;
  border-left: 2px solid var(--color-primary-light);
  margin-left: 8px;
  padding-left: 32px;
}

.timeline-item {
  position: relative;
  padding-bottom: 32px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -39px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-primary);
  border: 3px solid var(--color-primary-light);
}

.timeline-year {
  font-weight: 700;
  color: var(--color-primary-dark);
  font-size: var(--fs-sm);
  margin-bottom: 4px;
}

.timeline-item p {
  margin: 0;
  color: var(--color-text-secondary);
}

/* ---------- Member cards ---------- */
/* 所属組織（陣営）ごとのグループ。組織が増えても .member-group を追加するだけで並ぶ */
.member-groups {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  gap: 56px;
}

.member-group-title {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: var(--fs-md);
  color: var(--color-primary-dark);
  margin: 0 0 24px;
}

.member-group-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background-color: var(--color-border);
}

.member-grid > * {
  grid-column: span 3;
}

@media (max-width: 900px) {
  .member-grid > * {
    grid-column: span 6;
  }
}

/* スマートフォンでも縦に長くなりすぎないよう2列で表示 */
@media (max-width: 560px) {
  .member-grid > * {
    grid-column: span 6;
  }
}

.member-card {
  text-align: center;
}

.member-avatar {
  display: block;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background-color: var(--color-primary-light);
  object-fit: cover;
  margin: 0 auto 16px;
}

.member-role {
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--color-primary-dark);
  letter-spacing: 0.02em;
  margin-bottom: 4px;
}

.member-name {
  font-size: var(--fs-base);
  font-weight: 700;
  margin: 0 0 6px;
}

.member-desc {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  margin: 0;
}

/* ---------- CTA banner ---------- */
.cta-banner {
  grid-column: 1 / -1;
  background-color: var(--color-primary-darker);
  color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.cta-banner h2 {
  color: var(--color-white);
  font-size: var(--fs-xl);
  margin-bottom: 8px;
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
}

.cta-banner .btn-primary {
  background-color: var(--color-white);
  color: var(--color-primary-darker);
}

.cta-banner .btn-primary:hover {
  background-color: var(--color-primary-lighter);
}

/* ---------- Page header (sub pages) ---------- */
.page-header {
  padding: 48px 0;
  background-color: var(--color-primary-lighter);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb {
  grid-column: 1 / -1;
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.breadcrumb a {
  color: var(--color-text-muted);
}

.page-header h1 {
  grid-column: 1 / -1;
  font-size: var(--fs-2xl);
  margin-bottom: 8px;
}

.page-header .section-lead {
  grid-column: 1 / -1;
}

/* ---------- Footer ---------- */
.site-footer {
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding-top: 56px;
}

.footer-inner {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--gutter);
  padding-bottom: 40px;
}

.footer-brand {
  grid-column: span 5;
}

.footer-title {
  font-size: var(--fs-md);
  font-weight: 700;
  margin-bottom: 12px;
}

.footer-desc {
  color: var(--color-text-secondary);
  font-size: var(--fs-sm);
  max-width: 420px;
}

.footer-nav {
  grid-column: span 3;
}

.footer-nav-heading {
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
  margin-bottom: 16px;
}

.footer-nav li {
  margin-bottom: 12px;
}

.footer-nav a {
  color: var(--color-text-secondary);
  font-size: var(--fs-sm);
}

.footer-nav a:hover {
  color: var(--color-primary-dark);
}

.footer-meta {
  grid-column: span 4;
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
}

.footer-meta p {
  margin: 0 0 8px;
}

@media (max-width: 768px) {
  .footer-brand,
  .footer-nav,
  .footer-meta {
    grid-column: span 12;
  }
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 20px 0;
  border-top: 1px solid var(--color-border);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

.footer-bottom-links a {
  color: var(--color-text-muted);
}

/* ---------- Responsive nav ---------- */
@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
    order: 3;
  }

  .site-nav {
    gap: 12px;
  }

  .nav-list {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.2s ease;
  }

  .nav-list.is-open {
    max-height: 400px;
  }

  .nav-list li {
    width: 100%;
  }

  .nav-list a {
    display: block;
    width: 100%;
    padding: 14px 24px;
    border-bottom: 1px solid var(--color-border);
    border-left: 3px solid transparent;
  }

  .nav-list a:hover,
  .nav-list a[aria-current="page"] {
    border-bottom-color: var(--color-border);
    border-left-color: var(--color-primary);
    background-color: var(--color-primary-lighter);
  }

  .nav-cta {
    order: 2;
    padding: 10px 18px;
  }
}

/* ---------- Smartphone (〜640px) ---------- */
@media (max-width: 640px) {
  /* 文字サイズ・余白の基準値を一括で縮小 */
  :root {
    --fs-md: 1.0625rem;
    --fs-lg: 1.25rem;
    --fs-xl: 1.375rem;
    --fs-2xl: 1.625rem;
    --fs-3xl: 2rem;
    --gutter: 16px;
    --header-height: 60px;
  }

  .container {
    padding: 0 16px;
  }

  /* Header */
  .site-title {
    font-size: var(--fs-base);
  }

  .site-nav {
    gap: 8px;
  }

  .nav-cta {
    padding: 8px 14px;
    font-size: var(--fs-xs);
  }

  .nav-list a {
    padding: 14px 16px;
  }

  /* Buttons：長い文言でも折り返して画面幅に収める */
  .btn {
    white-space: normal;
    text-align: center;
    justify-content: center;
  }

  .hero-actions .btn,
  .cta-banner .btn {
    width: 100%;
  }

  /* Sections */
  .section {
    padding: 48px 0;
  }

  .section-header {
    margin-bottom: 28px;
  }

  .hero {
    padding: 48px 0 40px;
  }

  .hero-actions {
    gap: 12px;
  }

  .page-header {
    padding: 32px 0;
  }

  .prose {
    grid-column: 1 / -1;
  }

  .card {
    padding: 20px;
  }

  .cta-banner {
    padding: 28px 20px;
    gap: 24px;
  }

  .coming-soon {
    padding: 40px 16px;
  }

  /* Session */
  .info-panel {
    padding: 20px;
  }

  .info-panel-header {
    flex-wrap: wrap;
    gap: 8px;
  }

  .record-row {
    flex-direction: column;
    gap: 4px;
    padding: 16px 0;
  }

  .record-row .record-date {
    flex: none;
    margin: 0;
  }

  .record-row .record-title {
    margin: 0;
  }

  /* Project */
  .timeline {
    padding-left: 24px;
  }

  .timeline-item::before {
    left: -31px;
  }

  .member-groups {
    gap: 40px;
  }

  .member-card {
    padding: 16px 12px;
  }

  /* Portfolio */
  .portfolio-meta {
    flex-wrap: wrap;
    gap: 8px;
  }

  /* Footer */
  .site-footer {
    padding-top: 40px;
  }

  .footer-inner {
    padding-bottom: 24px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}