/* ==========================================================================
   公開ツール一覧サイト (My Tools) - Design System & Stylesheet
   Theme: Minimal Dark UI (Compact & High-Scannability)
   ========================================================================== */

:root {
  /* Color Tokens */
  --bg-main: #09090b;
  --bg-surface: #121215;
  --bg-surface-elevated: #18181b;
  --bg-surface-hover: #202025;
  --bg-card: #121216;
  --bg-card-hover: #17171d;
  
  --border-subtle: #27272a;
  --border-medium: #3f3f46;
  --border-focus: #38bdf8;

  --text-primary: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --text-inverse: #09090b;

  --accent-blue: #38bdf8;
  --accent-indigo: #818cf8;
  --accent-emerald: #34d399;
  --accent-purple: #c084fc;
  --accent-amber: #fbbf24;

  --cat-ai: rgba(56, 189, 248, 0.12);
  --cat-ai-border: rgba(56, 189, 248, 0.3);
  --cat-ai-text: #38bdf8;

  --cat-dev: rgba(129, 140, 248, 0.12);
  --cat-dev-border: rgba(129, 140, 248, 0.3);
  --cat-dev-text: #818cf8;

  --cat-file: rgba(52, 211, 153, 0.12);
  --cat-file-border: rgba(52, 211, 153, 0.3);
  --cat-file-text: #34d399;

  --cat-other: rgba(251, 191, 36, 0.12);
  --cat-other-border: rgba(251, 191, 36, 0.3);
  --cat-other-text: #fbbf24;

  /* Typography */
  --font-sans: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Transitions & Shadows */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-card: 0 2px 10px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 8px 24px -2px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(56, 189, 248, 0.2);
  --shadow-modal: 0 25px 50px -12px rgba(0, 0, 0, 0.85);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;
}

/* Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  line-height: 1.6;
  background: radial-gradient(circle at 50% 0%, #16161e 0%, #09090b 60%);
  background-attachment: fixed;
  color: var(--text-primary);
}

/* Container */
.site-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 2.25rem;
}

/* ==========================================================================
   Header Section
   ========================================================================== */
.site-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 2.25rem;
}

.header-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.85rem;
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.75rem;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid var(--cat-ai-border);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-blue);
  letter-spacing: 0.05em;
}

.status-indicator {
  width: 7px;
  height: 7px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-emerald);
  animation: pulse-glow 2s infinite ease-in-out;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.site-title {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  background: linear-gradient(135deg, #ffffff 40%, #a1a1aa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.site-lead {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #ffffff;
  background: linear-gradient(135deg, #ffffff 0%, #e2e8f0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.site-subtitle {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.site-description {
  font-size: 0.92rem;
  color: var(--text-muted);
  max-width: 720px;
  line-height: 1.6;
}

.site-description strong {
  color: var(--text-primary);
}

.header-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.25rem;
}

.link-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-fast);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-primary);
}

.link-chip:hover {
  background: var(--bg-surface-elevated);
  border-color: var(--border-medium);
  transform: translateY(-1px);
}

.chip-icon {
  width: 16px;
  height: 16px;
}

.note-chip:hover {
  color: #41c9b4;
  border-color: rgba(65, 201, 180, 0.4);
}

.github-chip:hover {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.4);
}

/* ==========================================================================
   Controls Section (Search & Tabs)
   ========================================================================== */
.controls-section {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.search-box {
  position: relative;
  width: 100%;
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  pointer-events: none;
}

.search-box input {
  width: 100%;
  padding: 0.8rem 2.75rem 0.8rem 2.85rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  outline: none;
}

.search-box input:focus {
  background: var(--bg-surface-elevated);
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.search-clear-btn {
  position: absolute;
  right: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.search-clear-btn:hover {
  color: var(--text-primary);
}

.category-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.tab-btn.active {
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent-blue);
  border-color: var(--cat-ai-border);
  font-weight: 600;
}

.tab-count {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.1rem 0.45rem;
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-full);
}

.tab-btn.active .tab-count {
  background: rgba(56, 189, 248, 0.2);
  color: var(--accent-blue);
}

.results-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 0 0.25rem;
}

.highlight-num {
  font-weight: 600;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.sort-selector {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.sort-selector select {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.8rem;
  padding: 0.3rem 0.6rem;
  outline: none;
  cursor: pointer;
}

.sort-selector select:focus {
  border-color: var(--accent-blue);
}

/* ==========================================================================
   Tool Grid & Compact Cards (High Scannability)
   ========================================================================== */
.main-content {
  min-height: 400px;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 1.25rem;
}

.tool-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  gap: 0.85rem;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal), background var(--transition-normal);
  position: relative;
}

.tool-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-medium);
  box-shadow: var(--shadow-hover);
  background: var(--bg-card-hover);
}

/* Top bar: Category + Detail button */
.card-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.badge-category {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.badge-category.cat-ai {
  background: var(--cat-ai);
  color: var(--cat-ai-text);
  border: 1px solid var(--cat-ai-border);
}

.badge-category.cat-dev {
  background: var(--cat-dev);
  color: var(--cat-dev-text);
  border: 1px solid var(--cat-dev-border);
}

.badge-category.cat-file {
  background: var(--cat-file);
  color: var(--cat-file-text);
  border: 1px solid var(--cat-file-border);
}

.badge-category.cat-other {
  background: var(--cat-other);
  color: var(--cat-other-text);
  border: 1px solid var(--cat-other-border);
}

.btn-detail-text {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  cursor: pointer;
  transition: color var(--transition-fast);
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius-sm);
}

.btn-detail-text:hover {
  color: var(--accent-blue);
  background: rgba(56, 189, 248, 0.08);
}

/* Title & One-line Description */
.card-title-group {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.card-subtitle {
  font-size: 0.8rem;
  color: var(--accent-blue);
  font-weight: 500;
}

.card-description {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Tags */
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: auto;
}

.tag-badge {
  font-size: 0.7rem;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0.1rem 0.45rem;
  border-radius: var(--radius-sm);
}

/* Compact Actions */
.card-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
  gap: 0.5rem;
  padding-top: 0.65rem;
  border-top: 1px solid var(--border-subtle);
}

.btn-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.45rem 0.65rem;
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-primary);
}

.btn-link:hover {
  transform: translateY(-1px);
}

.btn-github:hover {
  background: #24292e;
  color: #ffffff;
  border-color: #444d56;
}

.btn-note {
  background: rgba(65, 201, 180, 0.06);
  border-color: rgba(65, 201, 180, 0.2);
  color: #41c9b4;
}

.btn-note:hover {
  background: rgba(65, 201, 180, 0.18);
  border-color: rgba(65, 201, 180, 0.5);
  color: #ffffff;
}

.btn-web {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.12), rgba(129, 140, 248, 0.12));
  border-color: rgba(56, 189, 248, 0.3);
  color: var(--accent-blue);
}

.btn-web:hover {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.22), rgba(129, 140, 248, 0.22));
  border-color: var(--accent-blue);
  color: #ffffff;
}

.btn-icon {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
}

/* ==========================================================================
   Empty State
   ========================================================================== */
.empty-state {
  text-align: center;
  padding: 4rem 1.5rem;
  background: var(--bg-surface);
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.empty-icon {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.empty-state h3 {
  font-size: 1.15rem;
  color: var(--text-primary);
}

.empty-state p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  max-width: 420px;
}

.reset-btn {
  margin-top: 0.5rem;
  padding: 0.5rem 1.25rem;
  background: var(--accent-blue);
  color: var(--text-inverse);
  font-weight: 600;
  font-size: 0.85rem;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.reset-btn:hover {
  opacity: 0.9;
}

/* ==========================================================================
   Modal (Detailed View with Image & 3-point summary)
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.78);
  backdrop-filter: blur(8px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  position: relative;
  width: 100%;
  max-width: 620px;
  max-height: 88vh;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-modal);
  overflow-y: auto;
  transform: scale(0.96) translateY(10px);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-card {
  transform: scale(1) translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 34px;
  height: 34px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  border-radius: 50%;
  color: var(--text-secondary);
  font-size: 1.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.modal-media {
  width: 100%;
  max-height: 200px;
  background: #181820;
  overflow: hidden;
  border-bottom: 1px solid var(--border-subtle);
}

.modal-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.modal-body {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
}

.modal-header-section {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.modal-tool-title {
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.modal-section {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.modal-section-title {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-blue);
  font-family: var(--font-mono);
}

.modal-section-text {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.modal-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.modal-features-list li {
  font-size: 0.88rem;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.modal-features-list li::before {
  content: '✓';
  color: var(--accent-emerald);
  font-weight: bold;
}

.modal-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 0.5rem;
  padding-top: 1.15rem;
  border-top: 1px solid var(--border-subtle);
}

/* ==========================================================================
   Footer Section
   ========================================================================== */
.site-footer {
  margin-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 2.25rem;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.25rem;
}

.footer-concept {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.82rem;
}

.concept-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.1rem;
}

.concept-role {
  font-weight: 700;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.concept-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.concept-arrow {
  color: var(--text-muted);
  font-weight: 600;
}

.concept-item.highlight .concept-role {
  color: var(--accent-blue);
}

.footer-note {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-note a {
  color: var(--text-secondary);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

.footer-note a:hover {
  color: var(--accent-blue);
}

.copyright {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 768px) {
  .site-container {
    padding: 1.5rem 1rem 3rem;
    gap: 1.75rem;
  }

  .site-title {
    font-size: 2.1rem;
  }

  .site-lead {
    font-size: 1.1rem;
  }

  .tool-grid {
    grid-template-columns: 1fr;
  }

  .results-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}