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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #dc2626 0%, #991b1b 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 12px;
    padding: 40px 30px;
    max-width: 600px;
    width: 100%;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

h1 {
    color: #333;
    font-size: 28px;
    margin-bottom: 10px;
}

.subtitle {
    color: #666;
    font-size: 16px;
    margin-bottom: 30px;
    line-height: 1.5;
}

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

label {
    display: block;
    color: #333;
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 14px;
}

input[type="email"],
input[type="date"] {
    width: 100%;
    padding: 14px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

input[type="email"]:focus,
input[type="date"]:focus {
    outline: none;
    border-color: #dc2626;
}

input[type="email"]:read-only {
    background: #f7fafc;
    cursor: not-allowed;
}

.search-box {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    margin-bottom: 15px;
}

.search-box:focus {
    outline: none;
    border-color: #dc2626;
}

.subjects-list {
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
}

.subject-item {
    padding: 10px;
    margin-bottom: 8px;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.2s;
}

.subject-item:hover {
    background: #f7fafc;
}

.subject-item label {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.subject-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-right: 10px;
    cursor: pointer;
}

.selection-count {
    color: #dc2626;
    font-weight: 600;
    margin-bottom: 15px;
    font-size: 14px;
}

.error {
    color: #e53e3e;
    font-size: 14px;
    margin-top: 8px;
    display: none;
}

.error.show {
    display: block;
}

button {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #dc2626 0%, #991b1b 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-top: 10px;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(220, 38, 38, 0.4);
}

button:active {
    transform: translateY(0);
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.success {
    background: #48bb78;
    color: white;
    padding: 16px;
    border-radius: 8px;
    margin-top: 20px;
    display: none;
}

.success.show {
    display: block;
}

.hidden {
    display: none;
}

.footer {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
    text-align: center;
    font-size: 14px;
    color: #666;
}

.footer a {
    color: #dc2626;
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

@media (max-width: 480px) {
    .container {
        padding: 30px 20px;
    }
    
    h1 {
        font-size: 24px;
    }
}