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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

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

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 30px;
    background: rgba(255,255,255,0.1);
    border-radius: 15px;
    padding: 5px;
    backdrop-filter: blur(10px);
}

.tab-btn {
    background: transparent;
    border: none;
    color: white;
    padding: 15px 30px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    margin: 0 5px;
}

.tab-btn:hover {
    background: rgba(255,255,255,0.2);
}

.tab-btn.active {
    background: white;
    color: #667eea;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.tab-btn i {
    margin-right: 8px;
}

.tab-content {
    display: none;
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    backdrop-filter: blur(10px);
}

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

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

.input-section {
    margin-bottom: 30px;
}

#textInput {
    width: 100%;
    min-height: 120px;
    padding: 15px;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 1rem;
    resize: vertical;
    transition: border-color 0.3s ease;
    font-family: inherit;
}

#textInput:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.button-group {
    display: flex;
    gap: 15px;
    margin-top: 20px;
    justify-content: center;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.btn.primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.btn.secondary {
    background: #6c757d;
    color: white;
}

.btn.success {
    background: #28a745;
    color: white;
}

.btn.info {
    background: #17a2b8;
    color: white;
}

.qr-section {
    text-align: center;
}

.qr-container {
    display: inline-block;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

#qrCode {
    margin-bottom: 20px;
}

#qrCode img {
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.qr-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.scan-section {
    text-align: center;
}

.camera-container {
    position: relative;
    max-width: 500px;
    margin: 0 auto 30px;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

#video {
    width: 100%;
    height: 300px;
    object-fit: cover;
    background: #000;
}

.scan-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.scan-frame {
    width: 200px;
    height: 200px;
    border: 3px solid #667eea;
    border-radius: 10px;
    position: relative;
    animation: scanPulse 2s infinite;
}

.scan-frame::before {
    content: '';
    position: absolute;
    top: -3px;
    left: -3px;
    right: -3px;
    bottom: -3px;
    border: 3px solid transparent;
    border-radius: 10px;
    background: linear-gradient(45deg, #667eea, #764ba2) border-box;
    -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: destination-out;
    mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
}

@keyframes scanPulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(102, 126, 234, 0.7); }
    50% { box-shadow: 0 0 0 20px rgba(102, 126, 234, 0); }
}

.scan-controls {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 30px;
}

.result-section {
    background: #f8f9fa;
    border-radius: 15px;
    padding: 25px;
    margin-top: 30px;
}

.result-section h3 {
    margin-bottom: 20px;
    color: #333;
    text-align: center;
}

.result-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

#resultText {
    width: 100%;
    min-height: 100px;
    padding: 15px;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 1rem;
    resize: vertical;
    background: white;
    font-family: inherit;
}

.result-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: #333;
    color: white;
    padding: 15px 25px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    z-index: 1000;
    transform: translateX(400px);
    transition: transform 0.3s ease;
}

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

.toast.success {
    background: #28a745;
}

.toast.error {
    background: #dc3545;
}

.toast.warning {
    background: #ffc107;
    color: #212529;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .tabs {
        flex-direction: column;
        gap: 10px;
    }
    
    .tab-btn {
        margin: 0;
    }
    
    .button-group,
    .qr-actions,
    .scan-controls,
    .result-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .camera-container {
        max-width: 100%;
    }
    
    #video {
        height: 250px;
    }
    
    .scan-frame {
        width: 150px;
        height: 150px;
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

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