/* ==========================================================================
   Ploto LP - Premium Styling Sheet (Vanilla CSS)
   ========================================================================== */

/* --- 1. Variables & Design Tokens --- */
:root {
  /* Common Fonts */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-display: 'Outfit', sans-serif;

  /* Transitions */
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Dark Theme Variables (Default) */
[data-theme="dark"] {
  --bg-main: #0a0f1d;
  --bg-card: #131b2e;
  --bg-card-hover: #1e294b;
  --bg-header: rgba(10, 15, 29, 0.8);
  --border-color: #1f2d4d;
  
  --text-main: #e2e8f0;
  --text-muted: #94a3b8;
  --text-inverse: #0f172a;
  
  --color-primary: #6366f1; /* Indigo */
  --color-primary-light: #818cf8;
  --color-secondary: #06b6d4; /* Cyan */
  --color-accent: #f59e0b; /* Amber */
  --color-success: #10b981;
  --color-danger: #ef4444;
  
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #3b82f6 100%);
  --gradient-glow: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, rgba(0,0,0,0) 70%);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
  
  --scrollbar-track: #0e1322;
  --scrollbar-thumb: #26355a;
}

/* Light Theme Variables */
[data-theme="light"] {
  --bg-main: #f3f4f6;
  --bg-card: #ffffff;
  --bg-card-hover: #f9fafb;
  --bg-header: rgba(243, 244, 246, 0.8);
  --border-color: #cbd5e1;
  
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-inverse: #ffffff;
  
  --color-primary: #0078d4;
  --color-primary-light: #106ebe;
  --color-secondary: #107c41;
  --color-accent: #f7630c;
  --color-success: #107c41;
  --color-danger: #a80000;
  
  --gradient-primary: linear-gradient(135deg, #0078d4 0%, #005a9e 100%);
  --gradient-glow: radial-gradient(circle, rgba(0, 120, 212, 0.05) 0%, rgba(0,0,0,0) 70%);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 15px rgba(0, 120, 212, 0.15);
  
  --scrollbar-track: #f1f5f9;
  --scrollbar-thumb: #cbd5e1;
}

/* --- 2. CSS Reset --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.3s, color 0.3s;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

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

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  background: none;
  border: none;
  color: inherit;
}

button {
  cursor: pointer;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background-color: var(--color-primary-light);
}

/* --- 3. Helper Classes --- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.badge {
  display: inline-block;
  padding: 6px 16px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 24px;
  color: var(--color-primary-light);
  box-shadow: var(--shadow-sm);
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--text-inverse) !important;
  font-weight: 600;
  padding: 10px 24px;
  border-radius: 8px;
  transition: var(--transition-bounce);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
  filter: brightness(1.1);
}

.btn-secondary {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-weight: 600;
  padding: 10px 24px;
  border-radius: 8px;
  transition: var(--transition-smooth);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--color-primary-light);
}

.btn-large {
  padding: 14px 36px;
  font-size: 1.05rem;
  border-radius: 10px;
}

.btn-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
}

.btn-icon:hover {
  border-color: var(--color-primary-light);
  background-color: var(--bg-card-hover);
  color: var(--color-primary-light);
}

/* --- 4. Header & Navigation --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 80px;
  background-color: var(--bg-header);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: var(--transition-smooth);
}

.header-container {
  max-width: 1200px;
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-img {
  width: 32px;
  height: 32px;
}

.logo-text {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: -0.5px;
}

.nav-menu {
  display: flex;
  gap: 32px;
}

.nav-menu a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--transition-smooth);
}

.nav-menu a:hover {
  color: var(--color-primary-light);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Hide sun/moon icons based on active theme */
[data-theme="dark"] .sun-icon { display: none; }
[data-theme="dark"] .moon-icon { display: block; }
[data-theme="light"] .sun-icon { display: block; }
[data-theme="light"] .moon-icon { display: none; }

.btn-icon svg {
  width: 20px;
  height: 20px;
}

.lang-text {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

/* --- 言語切替ドロップダウン --- */
.lang-switcher {
  position: relative;
}

.lang-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 150px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 6px;
  display: none;
  flex-direction: column;
  gap: 2px;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.28);
  z-index: 1100;
}

.lang-switcher.is-open .lang-menu {
  display: flex;
}

.lang-option {
  display: block;
  width: 100%;
  text-align: left;
  padding: 9px 12px;
  border-radius: 6px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition-smooth);
}

.lang-option:hover {
  background-color: var(--bg-card-hover);
  color: var(--color-primary-light);
}

.lang-option.active {
  color: var(--color-primary-light);
  font-weight: 700;
}

/* --- ハンバーガーボタン（デフォルトは非表示・PCのみ） --- */
.hamburger-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  cursor: pointer;
  transition: var(--transition-smooth);
  flex-shrink: 0;
}

.hamburger-btn:hover {
  border-color: var(--color-primary-light);
  background-color: var(--bg-card-hover);
}

.hamburger-bar {
  display: block;
  width: 18px;
  height: 2px;
  background-color: var(--text-main);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease, width 0.3s ease;
  transform-origin: center;
}

/* メニューオープン時に×アイコンへ変形 */
.hamburger-btn[aria-expanded="true"] .hamburger-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger-btn[aria-expanded="true"] .hamburger-bar:nth-child(2) {
  opacity: 0;
  width: 0;
}
.hamburger-btn[aria-expanded="true"] .hamburger-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- スマホ向け注記バナー（デフォルト非表示、スマホのみ表示） --- */
.demo-mobile-notice {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.demo-mobile-notice svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: var(--color-accent);
}

/* PC縦横比を維持するためのラッパー（デフォルトは通常表示） */
.demo-scale-wrapper {
  width: 100%;
}

/* スマホ幅（768px以下）でのヘッダー・デモ調整 */
@media (max-width: 768px) {
  .hamburger-btn {
    display: flex;
  }

  /* PCのナビメニューを非表示 */
  .nav-menu {
    display: none;
  }

  /* ヘッダー右側のダウンロードボタンを非表示（ドロワー内に移動） */
  .header-actions .btn-primary {
    display: none;
  }

  /* ドロワーナビ本体 */
  .nav-menu-mobile {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    z-index: 999;
    background-color: var(--bg-header);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 24px 24px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    /* 初期状態：上に隠れた位置 */
    transform: translateY(-110%);
    opacity: 0;
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .nav-menu-mobile.is-open {
    transform: translateY(0);
    opacity: 1;
  }

  .nav-menu-mobile a {
    display: block;
    padding: 14px 8px;
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-smooth);
  }

  .nav-menu-mobile a:last-of-type {
    border-bottom: none;
  }

  .nav-menu-mobile a:hover {
    color: var(--color-primary-light);
    padding-left: 16px;
  }

  /* ドロワー内ダウンロードボタン */
  .nav-mobile-cta {
    margin-top: 16px;
  }

  .nav-mobile-cta .btn-primary {
    width: 100%;
    padding: 14px 24px;
    font-size: 1rem;
    border-radius: 10px;
    justify-content: center;
  }

  /* スマホ向け注記バナーを表示 */
  .demo-mobile-notice {
    display: flex;
  }

  /*
   * デモエリアをPC縦横比のまま縮小表示する。
   * transform: scale() はレイアウト上のサイズを変えないため、
   * overflow: hidden な親 + padding-bottom でスペースを確保する。
   * --scale-ratio はJSで画面幅に応じて動的に設定する。
   */
  .demo-scale-wrapper {
    overflow: hidden;
    /* スケール後の実際の高さ分を確保するためpadding-bottomをJSで制御 */
    position: relative;
  }

  .demo-scale-wrapper .demo-container {
    /* PCのデモ幅を基準に固定。スマホでscale縮小する */
    width: 1100px;
    transform-origin: top left;
    /* JS側で --demo-scale カスタムプロパティを設定し、動的にスケールを適用 */
    transform: scale(var(--demo-scale, 0.32));
  }
}



/* --- 5. Hero Section --- */
.hero-section {
  position: relative;
  padding: 160px 0 100px;
  overflow: hidden;
}

.glow-container {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: -1;
  pointer-events: none;
}

.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.5;
}

.orb-primary {
  width: 500px;
  height: 500px;
  background: var(--color-primary);
  top: -100px;
  right: -50px;
}

.orb-secondary {
  width: 400px;
  height: 400px;
  background: var(--color-secondary);
  bottom: 100px;
  left: -100px;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 48px;
}

.hero-content {
  max-width: 600px;
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 3.5rem;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 40px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-meta-info {
  display: flex;
  gap: 24px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.hero-meta-info span {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* --- 6. Browser UI Mockup --- */
.hero-visual {
  display: flex;
  justify-content: center;
  perspective: 1000px;
}

.hero-screenshot-container {
  width: 100%;
  max-width: 550px;
  border-radius: 8px;
  /* 境界線を物理borderではなくbox-shadowの1px拡張で表現することで、角丸の隙間から白フチが漏れるのを防ぐ */
  box-shadow: 0 0 0 1px var(--border-color), 0 20px 40px rgba(0, 0, 0, 0.3);
  overflow: hidden;
  transform: rotateY(-5deg) rotateX(5deg);
  transition: var(--transition-bounce);
  background-color: transparent; /* フェード中に親の背景が白く浮き出るのを防ぐ */
}

.hero-screenshot-container:hover {
  transform: rotateY(0deg) rotateX(0deg) scale(1.02);
  box-shadow: 0 0 0 1px var(--border-color), 0 25px 50px rgba(0, 0, 0, 0.4);
}

.app-screenshot-img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: inherit; /* 画像自体にも親コンテナと全く同じ角丸を適用して隙間をなくす */
  transform: scale(1.015); /* 画像自体の端に映り込んでいる白枠や影を枠外に押し出して隠す */
  transition: opacity 0.3s ease-in-out;
}

/* Simulated Sidebar */
.mock-sidebar {
  background-color: var(--bg-main);
  border-right: 1px solid var(--border-color);
  padding: 16px 8px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mock-sidebar-item {
  display: flex;
  align-items: center;
  gap: 8px;
  opacity: 0.4;
}

.mock-sidebar-item.active {
  opacity: 1;
}

.mock-icon {
  background-color: var(--text-muted);
}

.mock-icon.circle {
  width: 16px;
  height: 16px;
  border-radius: 50%;
}

.mock-line {
  background-color: var(--text-muted);
  height: 6px;
  border-radius: 3px;
}

.mock-line.short { width: 30px; }
.mock-line.medium { width: 45px; }

/* Simulated Workspace Main */
.mock-main {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.mock-toolbar {
  height: 40px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
}

.mock-tabs {
  display: flex;
  gap: 12px;
}

.mock-tab-item {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  padding-bottom: 4px;
}

.mock-tab-item.active {
  color: var(--color-primary-light);
  border-bottom: 2px solid var(--color-primary-light);
}

.mock-btn-sm {
  font-size: 0.65rem;
  background: var(--gradient-primary);
  color: var(--text-inverse);
  padding: 4px 10px;
  border-radius: 4px;
  font-weight: 700;
}

.mock-workspace {
  flex: 1;
  overflow: hidden;
  background-color: var(--bg-card);
}

/* Simulated Gantt */
.mock-gantt {
  display: grid;
  grid-template-columns: 140px 1fr;
  height: 100%;
  font-size: 0.65rem;
}

.mock-gantt-sidebar {
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.mock-gantt-header-cell {
  height: 30px;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-main);
  display: flex;
  align-items: center;
  padding-left: 12px;
  font-weight: 600;
  color: var(--text-muted);
}

.mock-gantt-row {
  height: 32px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  padding-left: 12px;
  position: relative;
  white-space: nowrap;
  overflow: hidden;
}

.mock-gantt-row.sub-row {
  padding-left: 24px;
  color: var(--text-muted);
}

.mock-text-bold {
  font-weight: 700;
}

.mock-alert-line {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
}

.mock-alert-line.green { background-color: var(--color-success); }
.mock-alert-line.orange { background-color: var(--color-accent); }
.mock-alert-line.red { background-color: var(--color-danger); }

.mock-gantt-timeline {
  display: flex;
  flex-direction: column;
}

.mock-gantt-header-timeline {
  height: 30px;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-main);
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  align-items: center;
  text-align: center;
  color: var(--text-muted);
  font-weight: 600;
}

.mock-gantt-grid-rows {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.mock-gantt-bar-row {
  height: 32px;
  border-bottom: 1px solid var(--border-color);
  position: relative;
  background-image: linear-gradient(to right, var(--border-color) 1px, transparent 1px);
  background-size: 20% 100%;
}

.mock-gantt-bar {
  position: absolute;
  top: 8px;
  height: 16px;
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
}

.mock-gantt-bar.primary {
  background: var(--gradient-primary);
}

.mock-gantt-bar.secondary {
  background-color: var(--color-secondary);
}

.mock-gantt-bar.warn {
  background-color: var(--color-danger);
}

/* --- 7. Features Section --- */
.features-section {
  padding: 100px 0;
  background-color: var(--bg-main);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 64px;
}

.section-title {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 32px;
}

.feature-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 40px 32px;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-glow);
  opacity: 0;
  transition: var(--transition-smooth);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-md);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  width: 50px;
  height: 50px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--text-inverse);
  position: relative;
  z-index: 2;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.alert-icon { background: linear-gradient(135deg, #ef4444, #f59e0b); }
.calendar-icon { background: linear-gradient(135deg, #10b981, #06b6d4); }
.undo-icon { background: linear-gradient(135deg, #8b5cf6, #ec4899); }
.lock-icon { background: linear-gradient(135deg, #6366f1, #3b82f6); }

.feature-card-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 16px;
  position: relative;
  z-index: 2;
}

.feature-card-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  position: relative;
  z-index: 2;
}

/* --- 8. Demo Section --- */
.demo-section {
  padding: 100px 0;
  background-color: var(--bg-main);
  border-top: 1px solid var(--border-color);
}

.demo-container {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  box-shadow: var(--shadow-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.demo-tabs {
  display: flex;
  justify-content: center;
  gap: 16px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 16px;
}

.demo-tab-btn {
  padding: 12px 24px;
  border-radius: 100px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-smooth);
  color: var(--text-muted);
  border: 1px solid transparent;
}

.demo-tab-btn:hover {
  color: var(--text-main);
  background-color: var(--bg-card-hover);
}

.demo-tab-btn.active {
  background: var(--gradient-primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-glow);
}

.tab-btn-icon {
  width: 18px;
  height: 18px;
}

.demo-window {
  min-height: 450px;
  position: relative;
}

.demo-pane {
  display: none;
  opacity: 0;
  transition: opacity 0.4s ease;
  height: 100%;
}

.demo-pane.active {
  display: block;
  opacity: 1;
}

/* Gantt Chart Customizations & Dark Overrides */
#gantt_container {
  width: 100%;
  height: 450px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

/* DHTMLX Gantt Dark Mode Overrides */
[data-theme="dark"] .gantt_container {
  background-color: #131b2e;
  border-color: #1f2d4d;
}
[data-theme="dark"] .gantt_grid_scale,
[data-theme="dark"] .gantt_task_scale {
  background-color: #1a253f;
  color: #e2e8f0;
  border-bottom-color: #1f2d4d;
}
[data-theme="dark"] .gantt_grid_head_cell {
  color: #e2e8f0;
  border-right-color: #1f2d4d;
}
[data-theme="dark"] .gantt_row,
[data-theme="dark"] .gantt_task_row {
  background-color: #131b2e;
  border-bottom-color: #1f2d4d;
}
[data-theme="dark"] .gantt_row.gantt_selected,
[data-theme="dark"] .gantt_task_row.gantt_selected {
  background-color: #1a253f;
}
[data-theme="dark"] .gantt_cell {
  border-right-color: #1f2d4d;
  color: #cbd5e1;
}
[data-theme="dark"] .gantt_task_cell {
  border-right-color: #1f2d4d;
}
[data-theme="dark"] .gantt_grid_data .gantt_row.gantt_selected .gantt_cell {
  border-right-color: #1f2d4d;
}
[data-theme="dark"] .gantt_task_line {
  border-color: #4f46e5;
  background-color: #6366f1;
}
[data-theme="dark"] .gantt_side_content {
  color: #e2e8f0;
}
[data-theme="dark"] .gantt_task_link .gantt_link_arrow {
  border-left-color: #06b6d4;
}
[data-theme="dark"] .gantt_task_link .gantt_link_line {
  background-color: #06b6d4;
}

/* Kanban Board Styling */
.kanban-instructions, .matrix-instructions {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  background-color: var(--bg-main);
  padding: 8px 16px;
  border-radius: 6px;
  border-left: 3px solid var(--color-primary-light);
}

.kanban-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  min-height: 400px;
}

.kanban-column {
  background-color: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.kanban-column-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  font-family: var(--font-display);
}

.column-title {
  font-size: 1.05rem;
}

.column-count {
  font-size: 0.8rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 2px 8px;
  border-radius: 10px;
  color: var(--text-muted);
}

.kanban-column-notes {
  font-size: 0.75rem;
  color: var(--text-muted);
  background-color: var(--bg-card);
  padding: 8px;
  border-radius: 6px;
  border: 1px dashed var(--border-color);
}

.kanban-cards-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 250px;
}

.kanban-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--color-primary);
  border-radius: 8px;
  padding: 16px;
  cursor: grab;
  transition: var(--transition-smooth);
}

.kanban-card:active {
  cursor: grabbing;
}

.kanban-card.dragging {
  opacity: 0.5;
  border-style: dashed;
}

.card-tags {
  margin-bottom: 8px;
}

.tag-badge {
  font-size: 0.7rem;
  font-weight: 600;
  background-color: var(--bg-main);
  border: 1px solid var(--border-color);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--text-muted);
}

.card-title {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.kanban-card.done .card-title {
  text-decoration: line-through;
  opacity: 0.6;
}

/* Matrix Board Styling */
.matrix-board {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.matrix-plane {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 12px;
  aspect-ratio: 16/9;
  max-height: 450px;
}

.matrix-quadrant {
  background-color: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 150px;
  transition: var(--transition-smooth);
}

.matrix-quadrant:hover {
  border-color: var(--color-primary-light);
}

.quadrant-label {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
}

.quad-task-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  overflow-y: auto;
  align-content: flex-start;
  flex: 1;
}

.matrix-task-chip {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--color-primary);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.matrix-task-chip:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  opacity: 0.9;
  border-color: var(--color-danger);
}

.matrix-task-chip.dragging {
  opacity: 0.5;
  border-style: dashed;
}

/* Creator Form */
.matrix-creator {
  background-color: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px;
}

.matrix-creator h4 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.matrix-input-group {
  display: flex;
  gap: 12px;
}

.matrix-input-group input {
  flex: 1;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 0.9rem;
}

.matrix-input-group input:focus {
  outline: none;
  border-color: var(--color-primary-light);
}

.matrix-input-group select {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 0.9rem;
  cursor: pointer;
}

.matrix-input-group select:focus {
  outline: none;
  border-color: var(--color-primary-light);
}

/* --- 9. Beta & Pricing --- */
.beta-section {
  padding: 100px 0;
  background-color: var(--bg-main);
}

.beta-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 60px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.beta-box::after {
  content: '';
  position: absolute;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 0%, rgba(0,0,0,0) 70%);
  top: -150px;
  right: -150px;
  pointer-events: none;
}

.beta-title {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.5px;
  margin-bottom: 24px;
}

.beta-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 800px;
  margin: 0 auto 40px;
}

.beta-info-card {
  display: flex;
  justify-content: center;
  align-items: center;
  max-width: 600px;
  margin: 0 auto;
  background-color: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 24px;
}

.info-card-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.info-card-item.border-left {
  border-left: 1px solid var(--border-color);
}

.info-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.info-value {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
}

.text-green {
  color: var(--color-success);
}

/* Feedback Form inside Beta Box */
.feedback-form-container {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--border-color);
  text-align: left;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.feedback-form-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.feedback-form-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.feedback-form-container form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-control-wrap {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-control-wrap label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.form-control-wrap input,
.form-control-wrap textarea {
  background-color: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 0.95rem;
  transition: var(--transition-smooth);
  color: var(--text-main);
  width: 100%;
}

.form-control-wrap input:focus,
.form-control-wrap textarea:focus {
  outline: none;
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-sm);
}

.feedback-form-container .btn-primary {
  align-self: flex-start;
  margin-top: 8px;
}

.feedback-success {
  margin-top: 20px;
  background-color: rgba(16, 185, 129, 0.1);
  border: 1px solid var(--color-success);
  color: var(--color-success);
  padding: 16px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  text-align: center;
  animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 576px) {
  .form-group-row {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

/* --- 10. Download Section --- */
.download-section {
  padding: 100px 0;
  background-color: var(--bg-main);
  border-top: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.download-box {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.download-title {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.download-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 48px;
}

.download-buttons {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 24px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.download-btn-store {
  background-color: #000000;
  color: #ffffff !important;
  border: 1px solid #333333;
  border-radius: 10px;
  padding: 12px 28px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: var(--transition-bounce);
}

.download-btn-store:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  border-color: #555555;
}

.store-icon {
  width: 28px;
  height: 28px;
}

.store-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.store-sub {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  opacity: 0.8;
}

.store-main {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  line-height: 1.2;
}

.download-btn-direct {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 12px 28px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: var(--transition-bounce);
}

.download-btn-direct:hover {
  transform: translateY(-3px);
  background-color: var(--bg-card-hover);
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-sm);
}

.direct-icon {
  width: 28px;
  height: 28px;
  color: var(--color-primary-light);
}

.direct-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.direct-sub {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.direct-main {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  line-height: 1.2;
}

.download-notes {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* --- 11. Footer --- */
.footer {
  background-color: var(--bg-main);
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

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

/* --- 12. Responsive Adjustments --- */
@media (max-width: 992px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 60px;
  }
  
  .hero-content {
    margin: 0 auto;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .hero-meta-info {
    justify-content: center;
  }
  
  .hero-visual {
    order: -1;
  }
  
  .browser-mockup {
    transform: none;
    margin: 0 auto;
  }
  
  .browser-mockup:hover {
    transform: scale(1.02);
  }
  
  .kanban-board {
    grid-template-columns: 1fr;
  }
  
  .matrix-plane {
    aspect-ratio: 1;
  }
}

@media (max-width: 768px) {
  .header-container {
    padding: 0 16px;
  }
  
  .nav-menu {
    display: none; /* Can build simple menu toggler or keep it simple */
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .beta-box {
    padding: 40px 24px;
  }
  
  .beta-info-card {
    flex-direction: column;
    gap: 16px;
  }
  
  .info-card-item.border-left {
    border-left: none;
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
    width: 100%;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ==========================================================================
   Security / Trust Section
   ========================================================================== */
.security-section {
  padding: 5rem 0;
  position: relative;
}

/* セクション全体に微妙なグラデーション背景を付与して Features と差別化 */
[data-theme="dark"] .security-section {
  background: linear-gradient(180deg, rgba(15, 23, 42, 0) 0%, rgba(99, 102, 241, 0.04) 50%, rgba(15, 23, 42, 0) 100%);
}
[data-theme="light"] .security-section {
  background: linear-gradient(180deg, rgba(248, 250, 252, 0) 0%, rgba(79, 70, 229, 0.03) 50%, rgba(248, 250, 252, 0) 100%);
}

.security-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

.security-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1.25rem;
  padding: 2rem 1.75rem;
  position: relative;
  overflow: hidden;
  transition: var(--transition-smooth);
}

/* カード上辺のグラデーションライン */
.security-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: var(--transition-smooth);
}

.security-card:hover {
  border-color: var(--color-primary);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.security-card:hover::before {
  opacity: 1;
}

.security-card-icon {
  font-size: 2.5rem;
  margin-bottom: 1.25rem;
  display: block;
  line-height: 1;
}

.security-card-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.875rem;
}

.security-card-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.75;
}

/* ==========================================================================
   Excel vs Ploto Comparison Section
   ========================================================================== */
.excel-section {
  padding: 5rem 0;
}

.excel-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 3rem;
  align-items: stretch;
}

.comparison-col {
  border-radius: 1.25rem;
  padding: 2rem;
  border: 1px solid;
}

/* Excel 列：赤系警告スタイル */
.excel-col {
  background: rgba(239, 68, 68, 0.05);
  border-color: rgba(239, 68, 68, 0.25);
}
[data-theme="light"] .excel-col {
  background: rgba(220, 38, 38, 0.04);
  border-color: rgba(220, 38, 38, 0.2);
}

/* Ploto 列：ブランドカラー（インディゴ）スタイル */
.ploto-col {
  background: rgba(99, 102, 241, 0.06);
  border-color: rgba(99, 102, 241, 0.3);
}
[data-theme="light"] .ploto-col {
  background: rgba(79, 70, 229, 0.04);
  border-color: rgba(79, 70, 229, 0.2);
}

.col-header {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  padding-bottom: 1rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid;
}

.excel-col .col-header {
  color: var(--color-danger);
  border-color: rgba(239, 68, 68, 0.25);
}

.ploto-col .col-header {
  color: var(--color-primary);
  border-color: rgba(99, 102, 241, 0.3);
}

.comparison-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* ✗ / ✓ プレフィックスを疑似要素で付与 */
.excel-col .comparison-list li::before {
  content: '✗  ';
  color: var(--color-danger);
  font-weight: 700;
}

.ploto-col .comparison-list li::before {
  content: '✓  ';
  color: var(--color-success);
  font-weight: 700;
}

.comparison-list li {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.65;
}

/* CTA ボタン */
.excel-cta {
  text-align: center;
  margin-top: 3rem;
}

/* Responsive: モバイルは1カラム */
@media (max-width: 768px) {
  .security-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .excel-comparison {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .security-section,
  .excel-section {
    padding: 3rem 0;
  }
}