:root {
    --bg-color: #2c2f36;
    --card-bg: #ffffff;
    --text-color: #3c4858;
    --accent-color: #4caf50; /* Green from Material Kit */
    --input-bg: #f5f5f5;
    --error-color: #f44336;
    --label-color: #757575;
}

body {
    margin: 0;
    font-family: "Roboto", "Helvetica", "Arial", sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
}

.page-header {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-image: linear-gradient(195deg, rgba(102, 187, 106, 0.8), rgba(67, 160, 71, 0.8));
    background-size: cover;
    background-position: center center;
}

.container {
    width: 100%;
    padding-right: 15px;
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto;
}

.login-container.card-signup {
    background-color: var(--card-bg);
    border-radius: 6px;
    box-shadow: 0 16px 24px 2px rgba(0, 0, 0, 0.14), 0 6px 30px 5px rgba(0, 0, 0, 0.12), 0 8px 10px -5px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 360px;
    margin: 0 auto;
    padding-bottom: 20px;
}

.login-header {
    padding: 1rem 2rem 0;
    text-align: center;
}

.torchwood-logo {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--accent-color);
    margin: 1rem 0 0.5rem 0;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.card-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.login-content {
    padding: 0 2rem 1rem 2rem;
}

.input-group {
    margin-bottom: 1.5rem;
    position: relative;
}

.input-label {
    display: none; /* Labels are handled by placeholders */
}

.input-field {
    width: 100%;
    padding: 12px 0;
    background-color: transparent;
    border: none;
    border-bottom: 1px solid #d2d2d2;
    color: var(--text-color);
    font-size: 1rem;
    box-sizing: border-box;
    transition: border-color 0.2s;
}

.input-field:focus {
    outline: none;
    border-bottom: 2px solid var(--accent-color);
}

.submit-btn {
    width: auto;
    padding: 12px 30px;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 30px; /* btn-round */
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    cursor: pointer;
    transition: box-shadow 0.2s, background-color 0.2s;
    margin-top: 1.5rem;
    box-shadow: 0 2px 2px 0 rgba(156, 39, 176, 0.14), 0 3px 1px -2px rgba(156, 39, 176, 0.2), 0 1px 5px 0 rgba(156, 39, 176, 0.12);
}

.submit-btn:hover {
    background-color: #8e24aa;
    box-shadow: 0 14px 26px -12px rgba(156, 39, 176, 0.42), 0 4px 23px 0px rgba(0, 0, 0, 0.12), 0 8px 10px -5px rgba(156, 39, 176, 0.2);
}

.alert {
    padding: 10px;
    margin-bottom: 15px;
    border-radius: 4px;
    font-size: 0.9rem;
    text-align: center;
    color: white;
}

.alert-error {
    background-color: var(--error-color);
}