/* 
 * ポートフォリオサイト スタイルシート
 * データサイエンティスト向けポートフォリオ
 */

/* ===== 基本設定 ===== */
:root {
  /* カラースキーム */
  --color-primary: #1a365d;      /* ダークブルー - メインカラー */
  --color-secondary: #2c7a7b;    /* ティール - アクセントカラー */
  --color-bg: #f7fafc;           /* ライトグレー - 背景色 */
  --color-text: #2d3748;         /* ダークグレー - テキスト */
  --color-text-light: #718096;   /* ミディアムグレー - 薄いテキスト */
  --color-heading: #1a202c;      /* ほぼブラック - 見出し */
  --color-white: #ffffff;        /* 白 - コンポーネント背景 */
  --color-light: #edf2f7;        /* 薄いグレー - 区切り線など */
  --color-accent: #4299e1;       /* ブルー - 強調 */
  --color-success: #38a169;      /* グリーン - 成功 */
  --color-warning: #dd6b20;      /* オレンジ - 警告 */
  --color-danger: #e53e3e;       /* レッド - 危険・エラー */
  
  /* フォント */
  --font-heading: 'Montserrat', sans-serif;
  --font-body: 'Open Sans', sans-serif;
  
  /* サイズ・スペース */
  --container-max-width: 1200px;
  --header-height: 70px;
  --section-spacing: 100px;
  --section-spacing-mobile: 60px;
  
  /* アニメーション */
  --transition-speed: 0.3s;
}

/* リセットとベース設定 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-heading);
  margin-bottom: 1rem;
  font-weight: 600;
  line-height: 1.2;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: 1rem;
}

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition-speed) ease;
}

a:hover {
  color: var(--color-primary);
}

ul, ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

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

/* コンテナ */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* セクション共通 */
section {
  padding: 5rem 0;
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
  padding-bottom: 1rem;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 3px;
  background-color: var(--color-secondary);
}

/* ボタン */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  border: none;
  font-family: var(--font-heading);
}

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

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

.btn-secondary {
  background-color: transparent;
  color: var(--color-secondary);
  border: 2px solid var(--color-secondary);
}

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

/* ===== ヘッダー ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: var(--color-white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  transition: all var(--transition-speed) ease;
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.logo a {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

.nav-menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--color-text);
  font-weight: 500;
  transition: color var(--transition-speed) ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-secondary);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
}

.hamburger {
  display: block;
  position: relative;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: all var(--transition-speed) ease;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  transition: all var(--transition-speed) ease;
}

.hamburger::before {
  top: -8px;
}

.hamburger::after {
  bottom: -8px;
}

/* ===== ヒーローセクション ===== */
.hero {
  height: 20vh;
  min-height: 300px;
  display: flex;
  align-items: center;
  background-color: var(--color-primary);
  background-image: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-white);
  margin-top: var(--header-height);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('../images/hero-pattern.svg');
  background-size: cover;
  opacity: 0.1;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 600px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--color-white);
}

.hero-subtitle {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  color: rgba(255, 255, 255, 0.9);
}

.hero-buttons {
  display: flex;
  gap: 1rem;
}

/* ===== 自己紹介セクション ===== */
.about {
  background-color: var(--color-white);
}

.about-content {
  display: flex;
  gap: 3rem;
  margin-bottom: 3rem;
}

.about-image {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.profile-image-placeholder {
  width: 250px;
  height: 250px;
  border-radius: 50%;
  background-color: var(--color-light);
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 5rem;
  color: var(--color-text-light);
}

.about-text {
  flex: 2;
}

.about-description {
  margin-bottom: 2rem;
  font-size: 1.1rem;
}

.about-details {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.detail-item h4 {
  color: var(--color-text-light);
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

/* タイムライン */
.timeline {
  margin-top: 4rem;
}

.timeline-container {
  position: relative;
  padding-left: 3rem;
}

.timeline-item {
  position: relative;
  margin-bottom: 2rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  top: 0.5rem;
  left: -2.75rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--color-secondary);
  border: 2px solid var(--color-white);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  z-index: 1;
}

.timeline-date {
  font-weight: 600;
  color: var(--color-secondary);
  margin-bottom: 0.5rem;
}

.timeline-position {
  font-weight: 500;
  color: var(--color-text-light);
  margin-bottom: 0.5rem;
}

.timeline-details {
  margin-top: 0.5rem;
}

/* スキル */
.skills {
  margin-top: 4rem;
}

.skills-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.skill-category h4 {
  margin-bottom: 1.5rem;
  color: var(--color-primary);
}

.skill-items {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.skill-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.skill-name {
  font-weight: 500;
}

.skill-description {
  background-color: var(--color-bg);
  padding: 0.75rem;
  border-radius: 6px;
  border-left: 3px solid var(--color-secondary);
  margin-top: 0.5rem;
}

.skill-description p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* ===== プロジェクトセクション ===== */
.projects {
  background-color: var(--color-bg);
}

.project-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.filter-btn {
  padding: 0.5rem 1rem;
  background-color: transparent;
  border: 1px solid var(--color-light);
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--font-heading);
  font-weight: 500;
  transition: all var(--transition-speed) ease;
}

.filter-btn:hover,
.filter-btn.active {
  background-color: var(--color-secondary);
  color: var(--color-white);
  border-color: var(--color-secondary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2rem;
}

.project-card {
  background-color: var(--color-white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.project-image {
  height: 200px;
  overflow: hidden;
}

.project-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-speed) ease;
}

.project-card:hover .project-img {
  transform: scale(1.05);
}

.project-info {
  padding: 1.5rem;
}

.project-title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.project-description {
  margin-bottom: 1rem;
  color: var(--color-text-light);
  font-size: 0.9rem;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tech-tag {
  padding: 0.25rem 0.5rem;
  background-color: var(--color-light);
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 500;
}

.project-link {
  display: inline-block;
  font-weight: 500;
  color: var(--color-secondary);
}

.project-link:hover {
  color: var(--color-primary);
}

/* ===== 実績セクション ===== */
.achievements {
  background-color: var(--color-white);
}

.achievement-category {
  margin-bottom: 3rem;
}

.achievement-category h3 {
  color: var(--color-primary);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-light);
}

.achievement-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.achievement-item {
  display: flex;
  gap: 1.5rem;
}

.achievement-date {
  flex: 0 0 120px;
  font-weight: 600;
  color: var(--color-secondary);
}

.achievement-content h4 {
  margin-bottom: 0.5rem;
}

/* ===== 職務経歴書セクション ===== */
.resume {
  background-color: var(--color-bg);
}

.resume-content {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.resume-timeline {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.resume-download {
  text-align: center;
}

/* ===== 連絡先セクション ===== */
.contact {
  background-color: var(--color-white);
}

.contact-content {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3rem;
}

.contact-info h3,
.contact-form h3 {
  margin-bottom: 1.5rem;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.contact-item i {
  width: 20px;
  color: var(--color-secondary);
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-link {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--color-light);
  color: var(--color-text);
  transition: all var(--transition-speed) ease;
}

.social-link:hover {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

/* フォーム */
.form-group {
  margin-bottom: 1.5rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

input,
textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--color-light);
  border-radius: 4px;
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color var(--transition-speed) ease;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-secondary);
}

/* ===== フッター ===== */
.footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 3rem 0;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
}

.footer-links a:hover {
  color: var(--color-white);
}

/* ===== プロジェクト詳細ページ ===== */
.project-detail-header {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 8rem 0 4rem;
  margin-bottom: 3rem;
}

.project-detail-header h1 {
  color: var(--color-white);
  margin-bottom: 1rem;
}

.project-meta {
  display: flex;
  gap: 2rem;
  color: rgba(255, 255, 255, 0.8);
}

.project-tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.project-tech-tags .tech-tag {
  background-color: rgba(255, 255, 255, 0.2);
  color: var(--color-white);
}

.project-overview {
  margin-bottom: 3rem;
}

.project-overview-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.project-main-image {
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.project-details,
.technical-details,
.conclusion {
  margin-bottom: 3rem;
}

.project-description,
.technical-content,
.conclusion-content {
  margin-bottom: 2rem;
}

.embedded-content{
  margin: 2rem 0;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0,0,0,.1);
}

.embedded-content iframe {
  width: 100%;
  border: none;
}

.image-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
}

.image-gallery img {
  border-radius: 8px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.project-navigation {
  padding: 2rem 0;
  border-top: 1px solid var(--color-light);
}

.nav-buttons {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-button {
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  font-weight: 500;
  transition: all var(--transition-speed) ease;
}

.nav-button:hover {
  background-color: var(--color-light);
}

.nav-button.center {
  background-color: var(--color-light);
}

.nav-button.center:hover {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

/* ===== レスポンシブデザイン ===== */

/* ---------- 1024px 以下 ---------- */
@media (max-width: 1024px) {
  :root { --section-spacing: 80px; }

  .hero-title { font-size: 3rem; }

  .projects-grid {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  }

  .project-overview-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

/* ---------- 768px 以下 ---------- */
@media (max-width: 768px) {
  :root { --section-spacing: var(--section-spacing-mobile); }

  /* ナビゲーション */
  .nav-menu{
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: 0;
    background: var(--color-white);
    flex-direction: column;
    align-items: center;
    overflow: hidden;
    transition: height var(--transition-speed) ease;
    box-shadow: 0 4px 6px rgba(0,0,0,.1);
  }
  .nav-menu.active{
    height: calc(100vh - var(--header-height));
    padding: 2rem 0;
  }
  .nav-link{ padding: 1rem; }

  .nav-toggle{ display: block; }
  .nav-toggle.active .hamburger{ background: transparent; }
  .nav-toggle.active .hamburger::before{ transform: rotate(45deg); top: 0; }
  .nav-toggle.active .hamburger::after { transform: rotate(-45deg); bottom: 0; }

  /* ヒーロー */
  .hero-title   { font-size: 2.5rem; }
  .hero-subtitle{ font-size: 1.25rem; }
  .hero-buttons{ flex-direction: column; gap: 1rem; }
  .hero-buttons .btn{ width: 100%; }

  /* セクション構成 */
  .about-content   { flex-direction: column; gap: 2rem; }
  .about-details   { grid-template-columns: 1fr; }
  .skills-container{ grid-template-columns: 1fr; }
  .contact-content { grid-template-columns: 1fr; }
  .achievement-item{ flex-direction: column; gap: .5rem; }
  .achievement-date{ flex: none; }
  .footer-content  { flex-direction: column; text-align: center; }
  .footer-links    { justify-content: center; flex-wrap: wrap; }

  /* 埋め込みコンテンツ (PDF / Slides) */
  .embedded-content{
    height: 80vh;                 /* 画面高 80%：必要に応じて調整 */
    overflow: auto;               /* 縦スクロール許可 */
    -webkit-overflow-scrolling: touch;
  }
  .embedded-content iframe{
    width: 100%;
    height: 100%;
    border: none;
  }
}

/* ---------- 480px 以下 ---------- */
@media (max-width: 480px) {

  /* 文字サイズ */
  .hero-title    { font-size: 2rem; }
  .section-title { font-size: 1.75rem; }

  /* プロジェクト一覧 */
  .projects-grid {
    grid-template-columns: 1fr;
    justify-content: center;
  }
  .project-card {
    width: 100%;
    max-width: 340px;
    margin: 0 auto;
  }
  .project-filters {
    flex-direction: column;
    align-items: center;
  }
  .filter-btn {
    width: 100%;
    text-align: center;
  }

  /* 余白 */
  .container { padding: 0 1rem; }

  /* ナビゲーションボタン */
  .nav-buttons {
    flex-direction: column;
    gap: 1rem;
  }
  .nav-button {
    width: 100%;
    text-align: center;
  }

  /* 埋め込みコンテンツ (PDF / Slides) */
  .embedded-content {
    height: 100vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  .embedded-content iframe {
    display: block;
    width: 100%;
    height: 100%;
    border: none;
  }
  .embedded-content canvas {
    max-width: 100%;
    box-shadow: 0 0 4px rgba(0,0,0,0.1);
  }
}