:root {
    --bg-color: #f4f7f6;
    --text-color: #2c3e50;
    --card-bg: #ffffff;
    --primary: #3498db;
    --border-radius: 8px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

header {
    margin-bottom: 30px;
    text-align: center;
}

header h1 {
    font-size: 2.2rem;
    color: #1a252f;
}

header p {
    color: #7f8c8d;
}

input[type="text"], input[type="file"], input[type="password"] {
    width: 100%;
    padding: 15px 20px;
    font-size: 1.1rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    outline: none;
    transition: box-shadow 0.3s;
}

input[type="text"]:focus {
    box-shadow: 0 0 8px rgba(52, 152, 219, 0.3);
    border-color: var(--primary);
}

button {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 12px 20px;
    font-size: 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 600;
}

button:hover {
    background-color: #2980b9;
}

.results-grid {
    margin-top: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 15px;
}

.card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    border: 1px solid #eee;
}

.card h3 {
    margin-bottom: 5px;
    color: #2c3e50;
    font-size: 1.2rem;
}

.dose-info {
    font-size: 1.5rem;
    font-weight: 700;
    color: #e74c3c;
    margin-bottom: 10px;
}

.reference {
    font-size: 0.85rem;
    color: #95a5a6;
}

.timestamp {
    font-size: 0.75rem;
    color: #bdc3c7;
    margin-top: 12px;
    padding-top: 8px;
    border-top: 1px dashed #ecf0f1;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}