@charset "UTF-8";
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ==========================================================================
   Design Tokens (Protocol Article 18 Standard)
   ========================================================================== */
:root {
  --bg-app: #09090b;             /* アプリケーション全体背景（漆黒 Zinc-950） */
  --bg-card: #121215;            /* カード・パネル・モーダル背景 */
  --bg-card-hover: #18181c;      /* カード・ボタンホバー時背景 */
  --bg-inset: #050506;           /* テーブルヘッダー・入力欄・インセット背景 */
  --border-color: #27272a;       /* 標準ボーダー（Zinc-800） */
  --border-color-hover: #3f3f46; /* ホバー・フォーカス時ボーダー（Zinc-700） */
  --text-primary: #f4f4f5;       /* 主見出し・メインテキスト（Zinc-100） */
  --text-secondary: #a1a1aa;     /* 本文・表データ・サブテキスト（Zinc-400） */
  --text-muted: #71717a;         /* プレースホルダー・単位・メタ情報（Zinc-500） */
  --accent-blue: #3b82f6;        /* アクティブ・リンク・選択（ボタン背景: #2563eb） */
  --accent-blue-hover: #1d4ed8;  /* ボタンホバー */
  --accent-emerald: #10b981;     /* 成功・完了・ポジティブ指標 */
  --accent-amber: #f59e0b;       /* 警告・注意・確認指標 */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Hiragino Sans', 'Noto Sans JP', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
  --container-max-width: 860px;
  --header-height: 64px;
  --radius-sm: 6px;
  --radius-md: 8px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-app);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ==========================================================================
   Typography
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.3;
}

h1 {
  font-size: 2rem;
  letter-spacing: -0.025em;
}

h2 {
  font-size: 1.375rem;
  letter-spacing: -0.015em;
  margin-bottom: 16px;
}

p {
  margin-bottom: 16px;
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: #60a5fa;
}

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

code, pre, .mono {
  font-family: var(--font-mono);
}

/* ==========================================================================
   Layout Components
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  height: var(--header-height);
  background-color: rgba(9, 9, 11, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.site-logo {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.site-logo:hover {
  color: var(--text-primary);
  opacity: 0.9;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-nav a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--text-primary);
}

/* Main */
.site-main {
  flex: 1;
  padding: 56px 0 80px;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-app);
  padding: 40px 0 48px;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px 24px;
}

.footer-nav a {
  color: var(--text-secondary);
  font-size: 0.8125rem;
}

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

.footer-divider {
  color: var(--border-color);
}

.footer-copyright {
  color: var(--text-muted);
  font-family: var(--font-sans);
}

/* ==========================================================================
   UI Components (Protocol Article 18 Standard)
   ========================================================================== */

/* Card */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.card:hover {
  border-color: var(--border-color-hover);
  background-color: var(--bg-card-hover);
}

/* Buttons */
.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius-sm);
  padding: 10px 20px;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s ease;
  line-height: 1.4;
  white-space: nowrap;
}

.btn-primary {
  background-color: #2563eb;
  border: 1px solid #3b82f6;
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--accent-blue-hover);
  border-color: #60a5fa;
  color: #ffffff;
}

.btn-secondary {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

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

/* Hero Section */
.hero-section {
  margin-bottom: 48px;
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 28px;
  max-width: 640px;
}

/* Stats / Count Display */
.tools-count-box {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 20px;
  margin-bottom: 32px;
}

.tools-count-label {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.tools-count-number {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent-emerald);
}

.tools-count-unit {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* About Section */
.about-section {
  margin-top: 48px;
}

.about-section h2 {
  font-size: 1.125rem;
  margin-bottom: 12px;
}

.about-section p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* ==========================================================================
   Tool List & Cards
   ========================================================================== */
.tool-category-section {
  margin-bottom: 48px;
}

.category-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.tool-card {
  display: flex;
  flex-direction: column;
  padding: 16px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: border-color 0.15s ease, background-color 0.15s ease;
  overflow: hidden;
}

.tool-card:hover {
  border-color: var(--border-color-hover);
  background-color: var(--bg-card-hover);
}

.tool-card-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: var(--bg-inset);
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.tool-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.2s ease;
}

.tool-card:hover .tool-card-thumb img {
  transform: scale(1.02);
}

.tool-card-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding-top: 14px;
}

.tool-card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: 4px;
}

.tool-card-subtitle {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  margin-bottom: 10px;
}

.tool-card-desc {
  font-size: 0.84375rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
  flex: 1;
}

.tool-card-footer {
  margin-top: auto;
}

.tool-card-footer .btn {
  width: 100%;
}

.empty-tools {
  padding: 48px 24px;
  text-align: center;
  color: var(--text-muted);
  background-color: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
}

/* ==========================================================================
   Tool Detail Page
   ========================================================================== */
.tool-detail-header {
  margin-bottom: 28px;
}

.tool-meta-badge-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 9999px;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  background-color: var(--bg-inset);
}

.badge-general {
  border-color: rgba(59, 130, 246, 0.3);
  color: #93c5fd;
  background-color: rgba(59, 130, 246, 0.1);
}

.badge-dev {
  border-color: rgba(16, 185, 129, 0.3);
  color: #6ee7b7;
  background-color: rgba(16, 185, 129, 0.1);
}

.badge-ai {
  border-color: rgba(168, 85, 247, 0.3);
  color: #d8b4fe;
  background-color: rgba(168, 85, 247, 0.1);
}

.badge-tech {
  border-color: rgba(245, 158, 11, 0.3);
  color: #fcd34d;
  background-color: rgba(245, 158, 11, 0.1);
}

.tool-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.025em;
  margin-bottom: 6px;
}

.tool-subtitle {
  font-size: 1rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.tool-media {
  margin: 28px 0;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.tool-media img {
  width: 100%;
  height: auto;
  display: block;
}

.tool-media-caption {
  padding: 10px 16px;
  font-size: 0.8125rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-inset);
}

.tool-section {
  margin-bottom: 32px;
}

.tool-section h2 {
  font-size: 1.1875rem;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.tool-section p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.8;
}

.tool-actions-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 36px 0;
}

.tool-actions-box h2 {
  font-size: 1.125rem;
  margin-bottom: 16px;
  border-bottom: none;
  padding-bottom: 0;
}

.tool-actions-box .btn-group {
  margin-top: 12px;
}

.support-box {
  background: linear-gradient(180deg, rgba(39, 39, 42, 0.25) 0%, rgba(18, 18, 21, 0.6) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 36px 0;
}

.support-box h2 {
  font-size: 1.125rem;
  margin-bottom: 10px;
  border-bottom: none;
  padding-bottom: 0;
}

.support-box p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.tool-meta-info {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 24px;
  font-size: 0.8125rem;
  color: var(--text-muted);
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  margin-top: 40px;
}

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

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 860px) {
  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .site-header {
    height: auto;
    padding: 14px 0;
  }

  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .site-nav {
    width: 100%;
    gap: 16px;
  }

  .site-main {
    padding: 36px 0 60px;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-description {
    font-size: 1rem;
  }

  .btn-group {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

  .tools-count-box {
    width: 100%;
    justify-content: space-between;
  }

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

  .tool-title {
    font-size: 1.625rem;
  }
}