:root {
    --bg-color: #f8f9fa;
    --box-bg: #ffffff;
    --text-main: #333333;
    --text-muted: #6c757d;
    --accent: #0068c9;
    --accent-hover: #0056a8;
    --input-bg: #ffffff;
    --border: #dee2e6;
    --error: #ff4b4b;
}

body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-box {
    background-color: var(--box-bg);
    padding: 40px 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    border: 1px solid var(--border);
}

.login-box h2 {
    margin: 0;
    font-size: 24px;
    text-align: center;
    font-weight: 600;
}

.subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 30px;
    font-size: 14px;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--text-muted);
}

.input-group input {
    width: 100%;
    padding: 12px 15px;
    background-color: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-main);
    font-size: 15px;
    box-sizing: border-box;
    transition: all 0.3s ease;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(0, 104, 201, 0.2);
}

.error-message {
    color: var(--error);
    font-size: 13px;
    margin-bottom: 15px;
    text-align: center;
    min-height: 20px;
}

.login-btn {
    width: 100%;
    padding: 12px;
    background-color: var(--accent);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.login-btn:hover {
    background-color: var(--accent-hover);
}