:root {
  --primary: #0f766e;
  --primary-hover: #0d9488;
  --bg-light: #f8fafc;
  --surface: #ffffff;
  --text: #1e293b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -2px rgba(0, 0, 0, 0.05);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Abhaya Libre", sans-serif;
}

body {
  background-color: var(--bg-light);
  color: var(--text);
  line-height: 1.5;
  padding-bottom: 70px; /* Space for mobile nav */
}

/* Header & Nav */
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.brand {
  font-weight: 700;
  color: var(--primary);
  font-size: 1.2rem;
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.nav-links a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
}

.lang-btn {
  background: var(--bg-light);
  border: 1px solid var(--border);
  padding: 0.4rem 0.8rem;
  border-radius: 20px;
  cursor: pointer;
  text-decoration: none;
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 600;
}

/* Container */
.container {
  max-width: 1000px;
  margin: 1.5rem auto;
  padding: 0 1rem;
}

/* Cards & Responsive Layout */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.25rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  margin-bottom: 1.5rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

/* Forms */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
}

.form-control:focus {
  border-color: var(--primary);
}

textarea.form-control {
  min-height: 100px;
  resize: vertical;
}

.btn {
  display: inline-block;
  background: var(--primary);
  color: white;
  padding: 0.75rem 1.25rem;
  border-radius: 8px;
  border: none;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  width: 100%;
  text-align: center;
  font-size: 1rem;
}

.btn:hover {
  background: var(--primary-hover);
}

/* Responsive Table / Mobile Card Stack */
.responsive-table {
  width: 100%;
  border-collapse: collapse;
}

.responsive-table th,
.responsive-table td {
  padding: 0.75rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

@media (max-width: 768px) {
  .desktop-nav {
    display: none;
  }

  .mobile-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--surface);
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-around;
    padding: 0.5rem 0;
    z-index: 100;
  }

  .mobile-nav a {
    color: var(--text);
    text-decoration: none;
    font-size: 0.75rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .responsive-table,
  .responsive-table tbody,
  .responsive-table tr,
  .responsive-table td {
    display: block;
    width: 100%;
  }

  .responsive-table thead {
    display: none;
  }

  .responsive-table tr {
    margin-bottom: 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.5rem;
  }

  .responsive-table td {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px dotted var(--border);
    padding: 0.5rem 0.25rem;
  }

  .responsive-table td::before {
    content: attr(data-label);
    font-weight: 700;
    color: var(--primary);
  }
}