/* ==================== VARIABLES ==================== */
:root {
  --bg: #0e1117;
  --surface: #161b22;
  --card: #161b22;
  --card-hover: #21262d;
  --stroke: #30363d;
  --accent: #58a6ff;       /* generic accent */
  --text: #c9d1d9;
  --muted: #8b949e;
  --buy: #4ade80;           /* green for buy */
  --sell: #ef6464;          /* red for sell */
  --yellow: #facc15;        /* yellow for special items */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --shadow: 0 4px 12px rgba(0,0,0,0.25);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* ==================== GLOBAL STYLES ==================== */
body {
  font-family: Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 60px 16px 16px 16px;
}

/* ==================== BACK BUTTON ==================== */
.back-btn {
  position: fixed;
  top: 20px;
  left: 20px;
  background-color: var(--surface);
  color: var(--accent);
  border: 1px solid var(--stroke);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  z-index: 1000;
  font-weight: bold;
  transition: background 0.2s, box-shadow 0.2s;
}
.back-btn:hover {
  background-color: var(--card-hover);
  box-shadow: 0 0 8px rgba(88,166,255,0.5);
}

/* ==================== SEARCH & SORT ==================== */
.search-sort-container {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.search-sort-container input,
.search-sort-container select {
  padding: 6px 12px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.05);
  color: var(--text);
  outline: none;
  font-size: 0.95rem;
}
.search-sort-container input::placeholder {
  color: var(--muted);
}
.search-sort-container select,
.search-sort-container input {
  cursor: pointer;
  transition: all 0.2s ease;
}
.search-sort-container select:hover,
.search-sort-container input:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ==================== MONTHLY SECTION ==================== */
.month-section {
  margin-bottom: 32px;
}
.month-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--accent);
  border-bottom: 1px solid var(--stroke);
  padding-bottom: 4px;
}

/* ==================== TRANSACTION TABLE ==================== */
.transaction-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  box-shadow: var(--shadow);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.transaction-table th,
.transaction-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--stroke);
  text-align: center;
  font-size: 0.9rem;
}
.transaction-table th {
  background-color: var(--card-hover);
  color: var(--muted);
  font-weight: 600;
}
.transaction-table tr:hover {
  background-color: var(--card-hover);
  transition: background 0.2s;
}

/* ==================== TYPE COLORS ==================== */
.buy { color: var(--buy); font-weight: 600; }
.sell { color: var(--sell); font-weight: 600; }
.money-add { color: var(--buy); font-weight: 600; }
.money-remove { color: var(--sell); font-weight: 600; }
.special { color: var(--yellow); font-weight: 600; } /* optional yellow highlight */

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
  .transaction-table th,
  .transaction-table td {
      padding: 8px;
      font-size: 0.85rem;
  }
  .search-sort-container {
      flex-direction: column;
      gap: 8px;
  }
}

@media (max-width: 480px) {
  .transaction-table th,
  .transaction-table td {
      padding: 6px;
      font-size: 0.8rem;
  }
  .back-btn {
      padding: 0.4rem 0.8rem;
      font-size: 0.9rem;
  }
}