/* Color Palette */
:root {
  --bg-main: #121417;       /* Off-black charcoal */
  --bg-sidebar: #1a1d24;    /* Dark slate gray */
  --accent-red: #d32f2f;    /* Deep matte red */
  --hover-red: #b71c1c;     /* Darker red hover */
  --text-primary: #ffffff;  /* Pure white */
  --text-muted: #8b949e;    /* Cool gray */
  --card-bg: rgba(255, 255, 255, 0.03); /* Subtle glass tint */
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-primary);
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* Sidebar Layout */
.sidebar {
  width: 240px;
  background-color: var(--bg-sidebar);
  display: flex;
  flex-direction: column;
  border-right: 1px solid rgba(255, 255, 255, 0.05);
}

.logo {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 2px;
  padding: 30px 20px;
  color: var(--accent-red);
}

.nav-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-links li {
  width: 100%;
}

.nav-links input[type="radio"] {
  display: none; /* Hide standard buttons */
}

/* Sidebar Clickable Tabs */
.nav-links label {
  display: block;
  padding: 15px 25px;
  color: var(--text-muted);
  cursor: pointer;
  font-weight: 600;
  transition: all 0.2s ease;
}

.nav-links label:hover {
  background-color: rgba(255, 255, 255, 0.02);
  color: var(--text-primary);
}

/* Active tab style */
.nav-links input[type="radio"]:checked + label {
  background-color: rgba(211, 47, 47, 0.1);
  color: var(--accent-red);
  border-left: 4px solid var(--accent-red);
  padding-left: 21px; /* Account for the border */
}

/* Main Content Wrapper */
.content {
  flex: 1;
  padding: 40px;
  overflow-y: auto;
}

/* Hide content blocks by default */
.section {
  display: none;
}

h1 {
  font-size: 28px;
  margin-bottom: 30px;
  font-weight: 700;
}

/* Grid System for Dashboard */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

/* Modern Matte Cards */
.card {
  background: var(--card-bg);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  padding: 25px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

.card h3 {
  margin: 0 0 10px 0;
  font-size: 16px;
  color: var(--text-muted);
}

.big-number {
  font-size: 42px;
  font-weight: 800;
  margin: 0;
  color: var(--text-primary);
}

/* Red Accent Card */
.card-red {
  background: linear-gradient(135deg, var(--accent-red), var(--hover-red));
  border: none;
}

.card-red h3, .card-red .big-number {
  color: #ffffff;
}

/* Active buttons */
.action-btn {
  display: inline-block;
  margin-top: 15px;
  padding: 10px 20px;
  background-color: var(--accent-red);
  color: #ffffff;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 600;
  font-size: 14px;
  transition: background-color 0.2s;
}

.action-btn:hover {
  background-color: var(--hover-red);
}

/* Logic to display sections on click */
#tab1:checked ~ .content #content1,
#tab2:checked ~ .content #content2,
#tab3:checked ~ .content #content3 {
  display: block;
}