:root {
    --primary-color: #4a6fa5;
    --primary-dark: #3a5a80;
    --secondary-color: #e74c3c;
    --background-color: #f8f9fa;
    --text-color: #2c3e50;
    --text-light: #7f8c8d;
    --border-color: #e1e4e8;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
    --error-color: #e74c3c;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    padding: 0;
    margin: 0;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

header h1 {
    color: var(--primary-color);
    margin-bottom: 5px;
    font-size: 2.5rem;
}

header p {
    color: var(--text-light);
    font-size: 1.1rem;
}

.email-box {
    background: white;
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    margin-bottom: 30px;
    text-align: center;
}

.email-prefix {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 10px;
    font-weight: 500;
}

.email-input-group {
    display: flex;
    margin-bottom: 15px;
}

.email-input-group input {
    flex: 1;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 4px 0 0 4px;
    font-size: 16px;
    font-family: 'Courier New', monospace;
    background: #fafafa;
}

.email-input-group button {
    padding: 0 15px;
    border: 1px solid var(--border-color);
    border-left: none;
    border-radius: 0 4px 4px 0;
    background: #f5f5f5;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.email-input-group button:hover {
    background: #eee;
}

.tooltip {
    visibility: hidden;
    width: 80px;
    background-color: #555;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -40px;
    opacity: 0;
    transition: opacity 0.3s;
}

.email-input-group button:hover .tooltip {
    visibility: visible;
    opacity: 1;
}

.button-group {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-bottom: 15px;
}

.btn-primary {
    padding: 12px 20px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
}

.btn-secondary {
    padding: 12px 20px;
    background-color: white;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    border-radius: 4px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-secondary:hover {
    background-color: #f0f4f9;
}

.generate-btn {
    width: 100%;
    padding: 15px;
    font-size: 18px;
}

.expiry {
    color: var(--text-light);
    font-size: 14px;
}

.inbox-container {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.inbox-header {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.inbox-header h2 {
    font-size: 18px;
    color: var(--text-color);
}

.inbox-controls {
    display: flex;
    gap: 10px;
}

.btn-icon {
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: 5px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background: #f5f5f5;
    color: var(--primary-color);
}

.inbox {
    flex: 1;
    overflow-y: auto;
}

.empty-inbox {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    text-align: center;
    color: var(--text-light);
}

.empty-inbox svg {
    margin-bottom: 20px;
    color: #d1d5da;
}

.empty-inbox p {
    margin: 5px 0;
}

.email-item {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background-color 0.2s;
}

.email-item:hover {
    background-color: #f9f9f9;
}

.email-item:last-child {
    border-bottom: none;
}

.email-subject {
    font-weight: 600;
    margin-bottom: 5px;
    display: flex;
    justify-content: space-between;
}

.email-from {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 8px;
}

.email-preview {
    color: var(--text-light);
    font-size: 14px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.email-body {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px dashed var(--border-color);
    font-size: 14px;
    line-height: 1.6;
    white-space: pre-wrap;
}

.email-time {
    font-size: 12px;
    color: var(--text-light);
}

footer {
    text-align: center;
    margin-top: 30px;
    padding: 20px 0;
    color: var(--text-light);
    font-size: 14px;
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .email-box {
        padding: 20px 15px;
    }
    
    .email-input-group {
        flex-direction: column;
    }
    
    .email-input-group input {
        border-radius: 4px;
        margin-bottom: 5px;
    }
    
    .email-input-group button {
        border-radius: 4px;
        border: 1px solid var(--border-color);
        padding: 8px;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .btn-primary, .btn-secondary {
        width: 100%;
    }
}