/* ==========================================================
   AI導入支援ポートフォリオ v1
   ブランドガイド: ../brand-guidelines/ai導入支援ポートフォリオ-v1.md
   ========================================================== */

:root {
  --color-gold: #C9A961;
  --color-gold-dark: #A98A4C;
  --color-slate: #8494A6;
  --color-navy: #1B3A5C;
  --color-white: #FFFFFF;
  --color-bg-soft: #F5F1E8;
  --color-text: #1F2933;

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

  --max-width: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-white);
}

h1, h2, h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.4;
  margin: 0 0 0.6em;
}

h1 { font-size: clamp(1.8rem, 4vw + 1rem, 3rem); }
h2 { font-size: clamp(1.5rem, 2.5vw + 1rem, 2.25rem); }
h3 { font-size: clamp(1.1rem, 1.5vw + 1rem, 1.5rem); }

p {
  margin: 0 0 1em;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.sp-only {
  display: inline;
}
@media (min-width: 768px) {
  .sp-only { display: none; }
}

/* ボタン */
.btn-primary {
  display: inline-block;
  background: var(--color-gold);
  color: var(--color-navy);
  text-decoration: none;
  font-weight: 700;
  padding: 0.75rem 1.75rem;
  border-radius: 999px;
  transition: box-shadow 0.2s ease;
  min-height: 44px;
  line-height: 1.3;
}
.btn-primary:hover,
.btn-primary:focus-visible {
  box-shadow: 0 4px 14px rgba(27, 58, 92, 0.3);
}
.btn-lg {
  font-size: 1.05rem;
  padding: 0.9rem 2.25rem;
}

/* ヘッダー */
.site-header {
  position: relative;
  border-bottom: 1px solid var(--color-bg-soft);
  padding: 1rem 0;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.logo {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  line-height: 0;
}
.logo img {
  display: block;
  width: auto;
  height: 42px;
}
.site-header nav {
  display: flex;
  gap: 1.5rem;
}
.site-header nav a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 700;
}
.site-header nav a:hover {
  color: var(--color-navy);
  text-decoration: underline;
}
.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 0;
  background: transparent;
  cursor: pointer;
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  margin: 5px 0;
  border-radius: 2px;
  background: var(--color-navy);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

@media (max-width: 640px) {
  .site-header {
    padding: 0.75rem 0;
  }
  .site-header .container {
    flex-wrap: nowrap;
  }
  .logo img {
    height: 34px;
  }
  .menu-toggle {
    display: block;
    flex: 0 0 auto;
  }
  .site-header nav {
    display: none;
    position: absolute;
    z-index: 10;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 0.4rem 1.25rem 0.8rem;
    border-top: 1px solid var(--color-bg-soft);
    background: var(--color-white);
    box-shadow: 0 8px 16px rgba(27, 58, 92, 0.08);
  }
  .site-header nav.is-open {
    display: flex;
  }
  .site-header nav a {
    display: block;
    padding: 0.7rem 0;
    border-bottom: 1px solid var(--color-bg-soft);
  }
  .site-header nav a:last-child {
    border-bottom: 0;
  }
  .menu-toggle.is-open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .menu-toggle.is-open span:nth-child(2) {
    opacity: 0;
  }
  .menu-toggle.is-open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}

/* Hero */
.hero {
  background: var(--color-bg-soft);
  padding: 4rem 0 2rem;
  overflow: hidden;
}
.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2.5rem;
}
@media (min-width: 900px) {
  .hero-inner {
    flex-direction: row;
    gap: 3rem;
  }
  .hero-text {
    flex: 0 0 40%;
  }
  .hero-visual {
    flex: 1 1 60%;
  }
}
.hero-text {
  text-align: center;
}
@media (min-width: 900px) {
  .hero-text {
    text-align: left;
  }
}
.hero h1 {
  color: var(--color-navy);
  letter-spacing: 0.02em;
}
.hero-lead {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-navy);
  margin: 0 0 1rem;
}
.hero .sub {
  font-size: 1rem;
  max-width: 32em;
  margin: 0 auto 1.5rem;
}
@media (min-width: 900px) {
  .hero .sub {
    margin: 0 0 1.5rem;
  }
}
.hero-name {
  font-weight: 700;
  color: var(--color-navy);
  margin: 0 0 1.5rem;
}
.hero-visual {
  width: 100%;
  max-width: 640px;
}
.hero-visual svg {
  width: 100%;
  height: auto;
  display: block;
}
.hero-scroll {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  width: fit-content;
  margin: 2.5rem auto 0;
  color: var(--color-slate);
  text-decoration: none;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.hero-scroll:hover {
  color: var(--color-navy);
}

/* コンセプト */
.concept {
  background: var(--color-white);
  padding: 4rem 0;
}
.concept-flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}
@media (min-width: 900px) {
  .concept-flow {
    flex-direction: row;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.5rem;
  }
}
.concept-step {
  text-align: center;
  max-width: 14em;
}
.concept-dot {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-navy);
  margin-bottom: 0.75rem;
}
.concept-step:last-child .concept-dot {
  background: var(--color-gold);
}
.concept-step h3 {
  color: var(--color-navy);
  margin-bottom: 0.4em;
}
.concept-step p {
  font-size: 0.9rem;
  color: var(--color-text);
  margin: 0;
}
.concept-arrow {
  color: var(--color-slate);
  font-size: 1.1rem;
  transform: rotate(90deg);
}
@media (min-width: 900px) {
  .concept-arrow {
    transform: none;
    margin-top: 0.4rem;
  }
}

/* 目指していること */
.vision {
  background: var(--color-white);
  padding: 4rem 0;
}
.vision-inner {
  max-width: 34em;
  margin: 0 auto;
}
.section-eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gold-dark);
  margin: 0 0 0.75rem;
}
.vision-inner h2 {
  color: var(--color-navy);
  margin-bottom: 1.5rem;
}
.vision-inner p {
  font-size: 1rem;
}

/* 何者か */
.who {
  padding: 4rem 0;
}
.who h2 {
  text-align: center;
  margin-bottom: 2.5rem;
}
.who-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
@media (min-width: 768px) {
  .who-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
.who-card {
  background: var(--color-white);
  border: 1px solid var(--color-bg-soft);
  border-radius: 12px;
  padding: 1.75rem;
}
.who-card h3 {
  color: var(--color-gold-dark);
}
.who-card p {
  margin: 0;
}

/* プロジェクト */
.projects {
  background: var(--color-white);
  padding: 4rem 0;
}
.projects h2 {
  color: var(--color-navy);
  max-width: 24em;
  margin-bottom: 2.5rem;
}
.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
@media (min-width: 768px) {
  .project-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
.project-card {
  background: var(--color-white);
  border: 1px solid var(--color-bg-soft);
  border-radius: 12px;
  padding: 1.75rem;
  box-shadow: 0 2px 12px rgba(27, 58, 92, 0.06);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.project-tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-gold-dark);
  margin-bottom: 0.25rem;
}
.project-card h3 {
  color: var(--color-navy);
  margin-bottom: 0.3em;
}
.project-card p {
  margin: 0;
  flex: 1;
}
.project-link {
  align-self: flex-start;
  margin-top: 0.75rem;
  color: var(--color-navy);
  font-weight: 700;
  text-decoration: none;
}
.project-link:hover,
.project-link:focus-visible {
  text-decoration: underline;
}
.project-card--pending {
  background: transparent;
  border: 1px dashed rgba(27, 58, 92, 0.3);
  box-shadow: none;
}
.project-card--pending p {
  color: var(--color-slate);
}

/* ツール */
.works {
  background: var(--color-bg-soft);
  padding: 4rem 0;
}
.works .section-eyebrow {
  text-align: center;
}
.works h2 {
  text-align: center;
  margin-bottom: 2.5rem;
}
.works-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
@media (min-width: 640px) {
  .works-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1000px) {
  .works-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}
.work-card {
  background: var(--color-navy);
  color: var(--color-white);
  border-radius: 12px;
  padding: 1.5rem;
  min-height: 160px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.work-card h3 {
  color: var(--color-white);
  margin-bottom: 0.3em;
}
.work-card p {
  margin: 0;
  font-size: 0.95rem;
  opacity: 0.9;
}
.work-tag {
  display: inline-block;
  align-self: flex-start;
  background: var(--color-gold);
  color: var(--color-navy);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
}
.work-card--pending {
  background: transparent;
  border: 1px dashed rgba(27, 58, 92, 0.4);
  color: var(--color-navy);
  align-items: center;
  justify-content: center;
  min-height: 100px;
}
.work-card--pending .work-tag {
  background: transparent;
  color: var(--color-navy);
  border: 1px solid var(--color-navy);
}

/* プロジェクト詳細ページ */
.project-detail {
  padding: 3rem 0 5rem;
}
.project-detail .back-link {
  display: inline-block;
  color: var(--color-slate);
  text-decoration: none;
  font-size: 0.9rem;
  margin-bottom: 2rem;
}
.project-detail .back-link:hover {
  color: var(--color-navy);
}
.project-detail-header {
  max-width: 42em;
  margin: 0 auto 3rem;
}
.project-detail-header .project-tag {
  font-size: 0.8rem;
}
.project-detail-header h1 {
  color: var(--color-navy);
  margin: 0.5rem 0 1rem;
}
.project-detail-header .lead {
  font-size: 1.05rem;
  color: var(--color-text);
}
.project-detail-body {
  max-width: 42em;
  margin: 0 auto;
}
.project-detail-body section {
  margin-bottom: 3rem;
}
.project-detail-body .section-eyebrow {
  display: block;
}
.project-detail-body h2,
.project-detail-body h3 {
  color: var(--color-navy);
  margin-bottom: 1rem;
}
.project-detail-body h3 {
  font-size: 1.05rem;
}
.project-detail-body p {
  font-size: 1rem;
}
.project-detail-body ul {
  margin: 0 0 1em;
  padding-left: 1.4em;
}
.project-detail-body li {
  margin-bottom: 0.4em;
}

/* 活用フロー */
.flow-grid {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin: 2rem 0;
  padding: 1.75rem;
  background: var(--color-bg-soft);
  border-radius: 12px;
}
@media (min-width: 900px) {
  .flow-grid {
    flex-direction: row;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 1.75rem 1.25rem;
  }
}
.flow-step {
  flex: 1;
  text-align: center;
}
.flow-step h4 {
  font-family: var(--font-heading);
  color: var(--color-navy);
  font-size: 1rem;
  margin: 0 0 0.3em;
}
.flow-step p {
  font-size: 0.85rem;
  color: var(--color-text);
  margin: 0;
}
.flow-arrow {
  display: block;
  text-align: center;
  color: var(--color-slate);
  transform: rotate(90deg);
}
@media (min-width: 900px) {
  .flow-arrow {
    transform: none;
    margin-top: 0.6rem;
  }
}

/* 連絡先 */
.contact {
  padding: 4rem 0;
  text-align: center;
}
.contact h2 {
  max-width: 30em;
  margin: 0 auto 2rem;
}

/* フッター */
.site-footer {
  background: var(--color-navy);
  color: var(--color-white);
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.9rem;
}
.site-footer p {
  margin: 0;
}