:root {
    --primary-blue: #004693;
    --dark-blue: #002d62;
    --light-bg: #f4f7fc;
    --text-color: #333333;
    --border-color: #e2e8f0;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--light-bg);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Top Bar & Header */
.top-bar {
    background-color: var(--dark-blue);
    color: #ffffff;
    padding: 8px 20px;
    text-align: right;
    font-size: 0.85rem;
}
.top-bar a { color: #fff; text-decoration: none; margin-left: 15px; }

header {
    background: #ffffff;
    padding: 15px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}
.logo { font-size: 1.5rem; font-weight: bold; color: var(--primary-blue); }

/* Main Layout Architecture */
.app-container {
    display: flex;
    flex: 1;
}

/* Left Sidebar */
aside.sidebar {
    width: 280px;
    background: #ffffff;
    border-right: 1px solid var(--border-color);
    padding: 20px 0;
}
aside.sidebar h3 {
    padding: 0 20px 10px 20px;
    font-size: 0.9rem;
    color: #718096;
    text-transform: uppercase;
}
aside.sidebar ul { list-style: none; }
aside.sidebar ul li a {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: #4a5568;
    text-decoration: none;
    transition: all 0.2s;
}
aside.sidebar ul li a:hover, aside.sidebar ul li.active a {
    background-color: #ebf8ff;
    color: var(--primary-blue);
    border-left: 4px solid var(--primary-blue);
}

/* Right Content Window */
main.main-content {
    flex: 1;
    padding: 40px;
}
.tool-card {
    background: #ffffff;
    padding: 30px;
    margin:10px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.02);
}

/* Shared Form UI Components */
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 600; }
.form-control {
    width: 100%; padding: 12px; border: 1px solid var(--border-color);
    border-radius: 6px; font-size: 1rem;
}
.btn-primary {
    background: var(--primary-blue); color: #fff; border: none;
    padding: 12px 24px; border-radius: 6px; cursor: pointer; font-weight: 600;
}
.btn-primary:hover { background: var(--dark-blue); }

/* Unified Results Layout */
.results-box {
    margin-top: 30px; padding: 20px; background: #f8fafc;
    border-left: 4px solid #10b981; border-radius: 4px;
}
.results-table {
    width: 100%; border-collapse: collapse; margin-top: 15px;
}
.results-table th, .results-table td {
    border: 1px solid var(--border-color); padding: 12px; text-align: left;
}
.results-table th { background: #edf2f7; }

/* Responsive Grid Adaptation */
@media (max-width: 768px) {
    .app-container { flex-direction: column; }
    aside.sidebar { width: 100%; border-right: none; border-bottom: 1px solid var(--border-color); }
    main.main-content { padding: 20px; }
}