:root {
    --primary-color: #4a6fa5;
    --secondary-color: #6b8cbc;
    --accent-color: #ff6b6b;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --success-color: #28a745;
    --border-radius: 8px;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: var(--dark-color);
}

.container {
    width: 100%;
    max-width: 900px;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
}

header {
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 20px;
    text-align: center;
}

header h1 {
    font-size: 1.8rem;
    margin-bottom: 10px;
}

header p {
    opacity: 0.9;
    font-size: 0.95rem;
}

.tabs {
    display: flex;
    background-color: #e9ecef;
    border-bottom: 1px solid #dee2e6;
}

.tab {
    flex: 1;
    padding: 15px;
    text-align: center;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    border-bottom: 3px solid transparent;
}

.tab.active {
    background-color: white;
    border-bottom: 3px solid var(--primary-color);
    color: var(--primary-color);
}

.content {
    padding: 30px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

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

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark-color);
}

textarea, input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ced4da;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    resize: vertical;
    min-height: 120px;
}

input {
    min-height: auto;
}

textarea:focus, input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.2);
}

.button-group {
    display: flex;
    gap: 10px;
    margin-top: 25px;
}

button {
    padding: 12px 20px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    flex: 1;
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--light-color);
    color: var(--dark-color);
    border: 1px solid #ced4da;
}

.btn-secondary:hover {
    background-color: #e9ecef;
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-success:hover {
    background-color: #218838;
}

.result-container {
    margin-top: 25px;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: var(--border-radius);
    border: 1px dashed #ced4da;
}

.result-container h3 {
    margin-bottom: 10px;
    color: var(--primary-color);
}

.result-text {
    word-break: break-all;
    margin-bottom: 15px;
    line-height: 1.5;
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 20px;
    background-color: var(--success-color);
    color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transform: translateX(150%);
    transition: transform 0.3s ease;
    z-index: 1000;
}

.notification.show {
    transform: translateX(0);
}

.password-toggle {
    position: relative;
}

.toggle-icon {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: #6c757d;
}

footer {
    text-align: center;
    padding: 15px;
    color: #6c757d;
    font-size: 0.9rem;
    border-top: 1px solid #e9ecef;
}

/* a链接消除下划线 */
.no-underline {
    text-decoration: none;
}
/* 只在鼠标悬停时显示下划线 */
.no-underline:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .container {
        max-width: 100%;
    }

    .button-group {
        flex-direction: column;
    }

    .tab {
        padding: 12px;
        font-size: 0.9rem;
    }
}