:root {
    --primary-color: #000000;
    --background-color: #f7f7f8;
    --card-bg: #ffffff;
    --text-main: #111827;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background-color);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
}

.form-container {
    background-color: var(--card-bg);
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    width: 100%;
    max-width: 450px;
}

.header {
    margin-bottom: 24px;
    text-align: center;
}

.header h1 {
    margin: 0 0 8px 0;
    font-size: 24px;
}

.header p {
    margin: 0;
    color: var(--text-muted);
    font-size: 14px;
}

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

label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 6px;
}

input, textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    box-sizing: border-box;
    transition: border-color 0.2s;
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    ring: 2px solid var(--primary-color);
}

button {
    width: 100%;
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

button:hover {
    background-color: #333333;
}

button:disabled {
    background-color: #9ca3af;
    cursor: not-allowed;
}

.hidden {
    display: none;
}

#success-message {
    margin-top: 20px;
    padding: 12px;
    background-color: #dcfce7;
    color: #166534;
    border-radius: 8px;
    text-align: center;
    font-size: 14px;
}

#error-message {
    margin-top: 20px;
    padding: 12px;
    background-color: #fee2e2;
    color: #991b1b;
    border-radius: 8px;
    text-align: center;
    font-size: 14px;
}