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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

.header {
    text-align: center;
    color: white;
    margin-bottom: 30px;
    position: relative;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.header p {
    font-size: 1.1rem;
    opacity: 0.95;
}

.back-home {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255,255,255,0.2);
    color: white;
    padding: 8px 16px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.3s;
    backdrop-filter: blur(10px);
}

.back-home:hover {
    background: rgba(255,255,255,0.3);
    transform: translateY(-50%) translateX(-5px);
}

.main-card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.form-group input[type="text"],
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s;
}

.form-group input[type="text"]:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    min-height: 300px;
    resize: vertical;
    line-height: 1.6;
}

.submit-btn {
    width: 100%;
    padding: 18px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.submit-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.result-section {
    margin-top: 30px;
    padding: 25px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: 15px;
    display: none;
}

.result-section.show {
    display: block;
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 15px;
}

.result-link {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.result-link a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    word-break: break-all;
}

.result-link a:hover {
    text-decoration: underline;
}

.copy-btn {
    margin-top: 15px;
    padding: 12px 25px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s;
}

.copy-btn:hover {
    background: #5568d3;
}

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
    margin-right: 10px;
    vertical-align: middle;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.error-message {
    background: #fee;
    color: #c33;
    padding: 15px;
    border-radius: 8px;
    margin-top: 15px;
    border-left: 4px solid #c33;
    display: none;
}

.error-message.show {
    display: block;
}

.tips {
    margin-top: 25px;
    padding: 20px;
    background: #fff9e6;
    border-radius: 10px;
    border-left: 4px solid #ffc107;
}

.tips h3 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.tips ul {
    list-style-position: inside;
    color: #666;
    line-height: 1.8;
}

.nav-links {
    text-align: center;
    margin-top: 20px;
}

.nav-links a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    opacity: 0.9;
    transition: opacity 0.3s;
}

.nav-links a:hover {
    opacity: 1;
}