@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap');

:root {
  --bg-color: #ffffff;
  --text-color: #333333;
  --header-bg: #f8f9fa;
  --table-bg: #ffffff;
  --border-color: #e9ecef;
  --zebra-bg: #f8f9fa;
  --hover-bg: #e9ecef;
  --tab-active: #007bff;
  --positive: #28a745;
  --negative: #dc3545;
  --neutral: #6c757d;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #121212;
    --text-color: #ffffff;
    --header-bg: #1e1e1e;
    --table-bg: #1e1e1e;
    --border-color: #333333;
    --zebra-bg: #1e1e1e;
    --hover-bg: #2a2a2a;
    --tab-active: #4dabf7;
    --positive: #40c057;
    --negative: #fa5252;
    --neutral: #868e96;
  }
}

* {
  box-sizing: border-box;
}

body {
  font-family: 'Inter', sans-serif;
  margin: 0;
  padding: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

header {
  background-color: var(--header-bg);
  padding: 2rem 1rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.logo {
  width: 64px;
  height: 64px;
  margin-right: 1rem;
}

.title-row {
  display: flex;
  align-items: center;
}

header p {
  margin: 0.5rem 0 0;
  font-size: 1.1rem;
  color: var(--neutral);
  text-align: center;
}

h1 {
  margin: 0;
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--text-color);
}

.tabs {
  display: flex;
  justify-content: center;
  margin: 2rem 0;
  flex-wrap: wrap;
}

.tab-button {
  background: none;
  border: 2px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  margin: 0 0.25rem 0.5rem;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 0.5rem;
  transition: all 0.2s ease;
  color: var(--text-color);
  background-color: var(--table-bg);
}

.tab-button:hover {
  background-color: var(--hover-bg);
  border-color: var(--tab-active);
}

.tab-button.active {
  background-color: var(--tab-active);
  color: white;
  border-color: var(--tab-active);
}

.period-table {
  max-width: 1200px;
  margin: 0 auto 3rem;
  padding: 0 1rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  min-width: 600px;
  border-collapse: collapse;
  background-color: var(--table-bg);
  border-radius: 0.75rem;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  border: 1px solid var(--border-color);
}

th, td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

th {
  background-color: var(--header-bg);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-color);
  border-bottom: 2px solid var(--border-color);
}

tr:last-child td {
  border-bottom: none;
}

tr:nth-child(even) {
  background-color: var(--zebra-bg);
}

tr:hover {
  background-color: var(--hover-bg);
}

td a {
  color: var(--tab-active);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

td a:hover {
  color: var(--text-color);
  text-decoration: underline;
}

.positive {
  color: var(--positive);
  font-weight: 500;
}

.negative {
  color: var(--negative);
  font-weight: 500;
}

.neutral {
  color: var(--neutral);
  font-weight: 500;
}

footer {
  text-align: center;
  padding: 1rem;
  color: var(--neutral);
  font-size: 0.9rem;
  border-top: 1px solid var(--border-color);
  margin-top: 2rem;
}

@media (max-width: 768px) {
  .tabs {
    flex-direction: column;
    align-items: center;
  }

  .tab-button {
    margin: 0.25rem 0;
    width: 220px;
    font-size: 0.95rem;
  }

  table {
    font-size: 0.85rem;
  }

  th, td {
    padding: 0.6rem 0.4rem;
  }

  h1 {
    font-size: 2rem;
  }

  header {
    padding: 1.5rem 1rem;
  }

  .period-table {
    padding: 0 0.5rem;
    overflow-x: auto;
  }

  footer {
    padding: 0.75rem;
    font-size: 0.8rem;
  }
}