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

:root {
  --bg: #0f0f1a;
  --surface: #1a1a2e;
  --surface2: #222240;
  --border: #2a2a4a;
  --text: #e0e0f0;
  --text-dim: #8888aa;
  --primary: #6c63ff;
  --primary-glow: rgba(108, 99, 255, 0.3);
  --accent: #00d4aa;
  --red: #ff4757;
  --radius: 10px;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

/* === Header === */
.header {
  text-align: center;
  padding: 40px 20px 20px;
  background: linear-gradient(135deg, var(--surface) 0%, #16213e 100%);
  border-bottom: 1px solid var(--border);
}
.logo {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.subtitle {
  color: var(--text-dim);
  font-size: 0.9rem;
  margin-top: 6px;
}

/* === Tabs === */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 12px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}
.tab {
  padding: 8px 18px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.85rem;
  white-space: nowrap;
  transition: all 0.2s;
}
.tab:hover { background: var(--surface2); color: var(--text); }
.tab.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 0 20px var(--primary-glow);
}

/* === Container === */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

.tool-panel { display: none; }
.tool-panel.active { display: block; }

.tool-panel h2 {
  font-size: 1.3rem;
  margin-bottom: 16px;
  color: var(--accent);
}

/* === Inputs === */
.code-input {
  width: 100%;
  min-height: 200px;
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
  resize: vertical;
  outline: none;
  transition: border 0.2s;
}
.code-input:focus { border-color: var(--primary); box-shadow: 0 0 12px var(--primary-glow); }
.code-input::placeholder { color: #555577; }

.code-output {
  width: 100%;
  min-height: 100px;
  padding: 14px;
  margin-top: 12px;
  background: #0a0a18;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 6px;
}

/* === Buttons === */
.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0;
}
.btn {
  padding: 8px 20px;
  border: none;
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--surface2);
  color: var(--text);
}
.btn:hover { filter: brightness(1.2); transform: translateY(-1px); }
.btn.primary { background: var(--primary); color: #fff; }
.btn.red { background: var(--red); color: #fff; }
.btn.outline { background: transparent; border: 1px solid var(--border); }
.btn.small { padding: 5px 14px; font-size: 0.8rem; }

/* === Error === */
.error-msg { color: var(--red); font-size: 0.85rem; margin-bottom: 8px; min-height: 20px; }

/* === Diff === */
.diff-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.diff-grid .code-input { min-height: 250px; }
.diff-output {
  margin-top: 12px;
  padding: 14px;
  background: #0a0a18;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.5;
  white-space: pre-wrap;
  max-height: 400px;
  overflow-y: auto;
}
.diff-add { background: rgba(0, 212, 170, 0.2); color: var(--accent); display: block; }
.diff-remove { background: rgba(255, 71, 87, 0.2); color: var(--red); display: block; }

/* === Stats === */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 12px;
  margin: 16px 0;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}
.stat-num {
  display: block;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
  font-family: var(--font-mono);
}
.stat-label { display: block; font-size: 0.8rem; color: var(--text-dim); margin-top: 4px; }

/* === Timestamp === */
.ts-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}
.ts-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.ts-value {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--accent);
  margin: 10px 0;
  padding: 8px 12px;
  background: #0a0a18;
  border-radius: 6px;
  word-break: break-all;
}
.ts-input {
  width: 100%;
  padding: 8px 12px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-bottom: 8px;
}

/* === Footer === */
.footer {
  text-align: center;
  padding: 30px 20px;
  color: var(--text-dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}
.footer a { color: var(--primary); text-decoration: none; }
.footer a:hover { text-decoration: underline; }

/* === Modal === */
.modal {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
}
.modal.hidden { display: none; }
.modal-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px;
  max-width: 400px;
  width: 90%;
  text-align: center;
  position: relative;
}
.close-btn {
  position: absolute;
  top: 12px; right: 20px;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-dim);
}
.close-btn:hover { color: var(--text); }
.qrcode-placeholder {
  width: 200px;
  height: 200px;
  margin: 20px auto;
  background: var(--surface2);
  border: 2px dashed var(--border);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  font-size: 0.8rem;
}
.hint { margin-top: 12px; color: var(--text-dim); font-size: 0.85rem; }

/* === Responsive === */
@media (max-width: 700px) {
  .diff-grid { grid-template-columns: 1fr; }
  .tabs { gap: 6px; }
  .tab { font-size: 0.8rem; padding: 6px 12px; }
}

/* === Scrollbar === */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }