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

body {
    font-family: 'SimHei', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #e0e5ec 0%, #c8d6e5 100%);
    min-height: 100vh;
}

.header {
    background: linear-gradient(180deg, #0066cc 0%, #004499 100%);
    padding: 20px 40px;
    display: flex;
    align-items: center;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
}

.flag {
    width: 120px;
    height: 80px;
    margin-right: 30px;
    border-radius: 8px;
    box-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
}

.header h1 {
    font-size: 36px;
    color: #ffcc00;
    text-shadow: 3px 3px 0 #996600, -1px -1px 0 #996600;
    font-weight: bold;
    letter-spacing: 4px;
    flex: 1;
}

.language-switch {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.lang-toggle {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
    min-width: 80px;
}

.lang-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
}

.language-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: rgba(0, 68, 153, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 6px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    display: none;
    flex-direction: column;
    z-index: 100;
    min-width: 120px;
}

.language-dropdown.show {
    display: flex;
}

.lang-option {
    background: transparent;
    border: none;
    color: white;
    padding: 10px 20px;
    cursor: pointer;
    font-size: 14px;
    text-align: left;
    transition: all 0.2s ease;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.lang-option:last-child {
    border-bottom: none;
}

.lang-option:hover {
    background: rgba(255, 255, 255, 0.15);
}

.lang-option.active {
    background: rgba(255, 255, 255, 0.2);
    font-weight: bold;
}

@media (max-width: 768px) {
    .header {
        flex-wrap: wrap;
        padding: 10px 20px;
        justify-content: space-between;
    }
    
    .header h1 {
        font-size: 18px;
        letter-spacing: 2px;
        order: 2;
        width: 100%;
        text-align: center;
        margin-top: 10px;
        margin-bottom: 0;
    }
    
    .flag {
        width: 60px;
        height: 40px;
        margin-right: 0;
    }
    
    .language-switch {
        order: 3;
        position: absolute;
        top: 10px;
        right: 10px;
    }
    
    .lang-toggle {
        font-size: 12px;
        padding: 6px 12px;
        min-width: 60px;
    }
    
    .language-dropdown {
        right: 0;
        min-width: 100px;
    }
    
    .lang-option {
        font-size: 12px;
        padding: 8px 15px;
    }
}

.welcome-screen {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px;
    min-height: calc(100vh - 120px);
}

.welcome-card {
    background: linear-gradient(180deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 16px;
    padding: 40px 60px;
    width: 100%;
    max-width: 700px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.8);
    border: 1px solid #dee2e6;
}

.welcome-card h2 {
    font-size: 24px;
    color: #333;
    margin-bottom: 15px;
    font-weight: 600;
}

.welcome-card hr {
    border: none;
    border-top: 2px solid #ddd;
    margin-bottom: 30px;
}

.intro {
    font-size: 18px;
    color: #555;
    line-height: 1.8;
    margin-bottom: 30px;
    text-align: justify;
}

.rules h3 {
    font-size: 20px;
    color: #333;
    margin-bottom: 20px;
}

.rules ul {
    list-style: none;
    padding-left: 0;
}

.rules li {
    font-size: 16px;
    color: #555;
    line-height: 2;
    padding-left: 25px;
    position: relative;
}

.rules li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #0066cc;
    font-weight: bold;
}

.start-btn {
    background: linear-gradient(180deg, #0066cc 0%, #004499 100%);
    color: white;
    border: none;
    padding: 15px 60px;
    font-size: 20px;
    font-weight: bold;
    border-radius: 8px;
    cursor: pointer;
    margin-top: 30px;
    display: block;
    margin-left: auto;
    margin-right: auto;
    box-shadow: 0 4px 10px rgba(0, 102, 204, 0.3);
    transition: all 0.3s ease;
}

.start-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0, 102, 204, 0.4);
}

.test-container {
    display: flex;
    justify-content: center;
    padding: 40px;
}

.card {
    background: linear-gradient(180deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 16px;
    padding: 30px 50px;
    width: 100%;
    max-width: 800px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.8);
    border: 1px solid #dee2e6;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #ddd;
}

.question-progress {
    display: flex;
    align-items: baseline;
}

.current-num {
    font-size: 32px;
    font-weight: bold;
    color: #0066cc;
}

.separator {
    font-size: 20px;
    color: #999;
    margin: 0 5px;
}

.total-num {
    font-size: 18px;
    color: #999;
}

.timer-display {
    display: flex;
    align-items: center;
    background: #fff;
    padding: 10px 20px;
    border-radius: 25px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.timer-label {
    font-size: 14px;
    color: #666;
    margin-right: 10px;
}

.timer-value {
    font-size: 20px;
    font-weight: bold;
    color: #0066cc;
    font-family: 'Courier New', monospace;
}

.card h2 {
    font-size: 22px;
    color: #333;
    margin-bottom: 15px;
    font-weight: 600;
}

.card hr {
    border: none;
    border-top: 2px solid #ddd;
    margin-bottom: 35px;
}

.question {
    margin-bottom: 50px;
}

.question-number {
    font-size: 28px;
    color: #0066cc;
    font-weight: bold;
    margin-right: 8px;
}

.question-text {
    font-size: 26px;
    color: #0066cc;
    line-height: 1.6;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.option {
    display: flex;
    align-items: center;
    cursor: pointer;
    position: relative;
    padding: 15px 20px;
    border-radius: 8px;
    transition: background 0.3s ease;
}

.option:hover {
    background: rgba(0, 102, 204, 0.08);
}

.option input[type="radio"] {
    display: none;
}

.option-number {
    font-size: 22px;
    color: #333;
    margin-right: 15px;
    min-width: 45px;
}

.option-text {
    font-size: 22px;
    color: #333;
}

.option .underline {
    display: none;
    position: absolute;
    bottom: 8px;
    left: 65px;
    width: 50px;
    height: 3px;
    background: #333;
}

.option.selected {
    background: rgba(0, 102, 204, 0.1);
    border: 1px solid rgba(0, 102, 204, 0.3);
}

.option.selected .underline {
    display: block;
}

.progress-bar-container {
    margin: 40px 0;
}

.progress-bar {
    width: 100%;
    height: 15px;
    background: #ddd;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #7ed321 0%, #4caf50 100%);
    border-radius: 8px;
    transition: width 0.3s ease;
    box-shadow: 0 0 10px rgba(126, 211, 33, 0.5);
}

.nav-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 15px;
    margin-top: 20px;
}

.nav-btn {
    padding: 12px 35px;
    font-size: 18px;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.prev-btn {
    background: #fff;
    color: #666;
    border: 1px solid #ddd;
}

.prev-btn:hover:not(:disabled) {
    background: #f5f5f5;
}

.prev-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.next-btn {
    background: linear-gradient(180deg, #0066cc 0%, #004499 100%);
    color: white;
    box-shadow: 0 4px 10px rgba(0, 102, 204, 0.3);
}

.next-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0, 102, 204, 0.4);
}

.submit-btn {
    background: linear-gradient(180deg, #4caf50 0%, #388e3c 100%);
    color: white;
    box-shadow: 0 4px 10px rgba(76, 175, 80, 0.3);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(76, 175, 80, 0.4);
}

.result-container {
    display: flex;
    justify-content: center;
    padding: 40px;
}

.result-card {
    max-width: 900px;
}

.result-grade {
    display: flex;
    justify-content: center;
    margin: 40px 0;
}

.grade-circle {
    width: 220px;
    height: 220px;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #4caf50 0%, #388e3c 100%);
    box-shadow: 0 10px 30px rgba(76, 175, 80, 0.3);
}

.grade-circle.warning {
    background: linear-gradient(135deg, #ff9800 0%, #f57c00 100%);
    box-shadow: 0 10px 30px rgba(255, 152, 0, 0.3);
}

.grade-circle.danger {
    background: linear-gradient(135deg, #f44336 0%, #d32f2f 100%);
    box-shadow: 0 10px 30px rgba(244, 67, 54, 0.3);
}

.grade-text {
    font-size: 56px;
    font-weight: bold;
    color: white;
}

.grade-label {
    font-size: 22px;
    color: rgba(255, 255, 255, 0.9);
    margin-top: 8px;
}

.lang-en .grade-circle {
    width: 260px;
    height: 260px;
}

.lang-en .grade-text {
    font-size: 44px;
}

.lang-en .grade-label {
    font-size: 18px;
}

.result-details {
    margin: 30px 0;
}

.result-details h3 {
    font-size: 22px;
    color: #333;
    margin-bottom: 25px;
}

.result-section {
    margin-bottom: 30px;
    padding: 20px;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.result-section h4 {
    font-size: 18px;
    color: #0066cc;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid #eee;
}

.result-overview {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 30px;
    padding: 20px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 12px;
}

.scale-item {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
    gap: 10px;
}

.scale-item:last-child {
    margin-bottom: 0;
}

.scale-name {
    width: 150px;
    font-size: 14px;
    color: #555;
}

.scale-desc {
    font-size: 12px;
    color: #888;
    margin-left: 15px;
    flex: 1;
    min-width: 200px;
}

.scale-bar {
    flex: 1;
    min-width: 100px;
    height: 12px;
    background: #eee;
    border-radius: 6px;
    overflow: hidden;
    margin: 0 10px;
    position: relative;
}

.scale-fill {
    height: 100%;
    background: linear-gradient(90deg, #4caf50 0%, #8bc34a 100%);
    border-radius: 6px;
    transition: width 0.5s ease;
}

.scale-fill.warning {
    background: linear-gradient(90deg, #ff9800 0%, #ffc107 100%);
}

.scale-fill.danger {
    background: linear-gradient(90deg, #f44336 0%, #ff5722 100%);
}

.scale-status {
    width: 60px;
    font-size: 14px;
    font-weight: 600;
    color: #4caf50;
    text-align: right;
}

.scale-status.warning {
    color: #ff9800;
}

.scale-status.danger {
    color: #f44336;
}

.adaptation-score {
    text-align: center;
}

.adaptation-bar {
    width: 100%;
    height: 25px;
    background: #eee;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 15px;
}

.adaptation-fill {
    height: 100%;
    background: linear-gradient(90deg, #0066cc 0%, #4caf50 100%);
    border-radius: 12px;
    transition: width 0.5s ease;
}

.adaptation-text {
    font-size: 20px;
}

.adaptation-label {
    color: #666;
}

.adaptation-value {
    font-size: 32px;
    font-weight: bold;
    color: #0066cc;
    margin: 0 10px;
}

.adaptation-unit {
    color: #666;
}

.result-summary {
    margin: 30px 0;
    padding: 25px;
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.1) 0%, rgba(76, 175, 80, 0.05) 100%);
    border-radius: 10px;
    border-left: 5px solid #4caf50;
}

.result-summary.warning {
    background: linear-gradient(135deg, rgba(255, 152, 0, 0.1) 0%, rgba(255, 152, 0, 0.05) 100%);
    border-left-color: #ff9800;
    width: 100%;
}

.result-summary.danger {
    background: linear-gradient(135deg, rgba(244, 67, 54, 0.1) 0%, rgba(244, 67, 54, 0.05) 100%);
    border-left-color: #f44336;
    width: 100%;
}

.result-summary {
    margin: 20px 0;
    padding: 20px;
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.1) 0%, rgba(76, 175, 80, 0.05) 100%);
    border-radius: 10px;
    border-left: 5px solid #4caf50;
    width: 100%;
}

.interpretation {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    margin-top: 10px;
}

.interpretation p {
    font-size: 14px;
    color: #555;
    line-height: 1.8;
    margin-bottom: 10px;
}

.interpretation p:last-child {
    margin-bottom: 0;
}

.result-summary h3 {
    font-size: 20px;
    color: #333;
    margin-bottom: 15px;
}

.result-summary p {
    font-size: 16px;
    color: #555;
    line-height: 1.8;
}

.result-buttons {
    display: flex;
    justify-content: center;
    margin-top: 30px;
}

.result-btn {
    background: linear-gradient(180deg, #0066cc 0%, #004499 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 16px;
    font-weight: bold;
    border-radius: 8px;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0, 102, 204, 0.3);
    transition: all 0.3s ease;
    margin: 0 10px;
}

.share-btn {
    background: linear-gradient(180deg, #4caf50 0%, #388e3c 100%);
    box-shadow: 0 4px 10px rgba(76, 175, 80, 0.3);
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(76, 175, 80, 0.4);
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 90%;
    max-width: 400px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    position: relative;
}

.close-modal {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close-modal:hover,
.close-modal:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}

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

.share-content {
    text-align: center;
}

.share-result {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.share-result p {
    font-size: 16px;
    color: #555;
    margin: 8px 0;
}

.qr-code-container {
    background: #fff;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #eee;
}

.qr-code-container p {
    font-size: 14px;
    color: #666;
    margin-bottom: 15px;
}

.share-grade-circle {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, #4caf50 0%, #8bc34a 100%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin: 0 auto 15px;
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
}

.share-grade-circle.warning {
    background: linear-gradient(135deg, #ff9800 0%, #ffc107 100%);
    box-shadow: 0 4px 15px rgba(255, 152, 0, 0.3);
}

.share-grade-circle.danger {
    background: linear-gradient(135deg, #f44336 0%, #ff5722 100%);
    box-shadow: 0 4px 15px rgba(244, 67, 54, 0.3);
}

.share-grade-text {
    font-size: 18px;
    font-weight: bold;
    color: white;
}

.share-grade-label {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.9);
}

.share-details {
    margin-bottom: 15px;
}

.share-summary {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 15px;
    text-align: left;
}

.share-summary h4 {
    font-size: 16px;
    color: #333;
    margin-bottom: 10px;
    padding-bottom: 8px;
    border-bottom: 1px solid #eee;
}

.share-summary p {
    font-size: 14px;
    color: #555;
    line-height: 1.6;
}

#qrCode {
    width: 120px;
    height: 120px;
    border: 1px solid #ddd;
    border-radius: 8px;
    margin-bottom: 10px;
}

.qr-url {
    font-size: 12px !important;
    color: #0066cc !important;
    word-break: break-all;
}

.result-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0, 102, 204, 0.4);
}

@media (max-width: 768px) {
    body {
        background: #e0e5ec;
        min-height: 100vh;
    }
    
    .header {
        flex-direction: row;
        padding: 10px 15px;
        justify-content: center;
    }
    
    .flag {
        display: none;
    }
    
    .header h1 {
        font-size: 18px;
        text-align: center;
        letter-spacing: 2px;
    }
    
    .test-container,
    .welcome-screen {
        padding: 10px;
        min-height: calc(100vh - 60px);
    }
    
    .welcome-card,
    .card {
        padding: 20px 15px;
        margin: 0;
        border-radius: 12px;
        max-height: calc(100vh - 80px);
        overflow-y: auto;
    }
    
    .welcome-card h2 {
        font-size: 20px !important;
        margin-bottom: 15px !important;
    }
    
    .welcome-card p {
        font-size: 14px !important;
        line-height: 1.6 !important;
        margin-bottom: 12px !important;
    }
    
    .start-btn {
        padding: 12px 30px !important;
        font-size: 16px !important;
        margin-top: 20px !important;
    }
    
    .progress-header {
        flex-direction: row;
        gap: 10px;
        margin-bottom: 15px;
    }
    
    .question-number,
    .question-text {
        font-size: 17px;
        line-height: 1.6;
    }
    
    .question {
        margin-bottom: 20px;
    }
    
    .options {
        gap: 12px;
        margin-bottom: 15px;
    }
    
    .option {
        padding: 12px 15px;
        min-height: 48px;
    }
    
    .option-number,
    .option-text {
        font-size: 16px;
    }
    
    .progress-bar-container {
        margin-bottom: 15px;
    }
    
    .progress-bar {
        height: 10px;
    }
    
    .nav-buttons {
        flex-direction: row;
        gap: 10px;
    }
    
    .nav-btn {
        padding: 10px 15px;
        font-size: 15px;
    }
    
    .footer {
        padding: 10px;
        margin-top: 15px;
    }
    
    .footer p {
        font-size: 12px;
    }
    
    .result-grade {
        margin-bottom: 15px !important;
    }
    
    .grade-circle {
        width: 150px !important;
        height: 150px !important;
    }
    
    .grade-text {
        font-size: 40px !important;
    }
    
    .lang-en .grade-circle {
        width: 180px !important;
        height: 180px !important;
    }
    
    .lang-en .grade-text {
        font-size: 32px !important;
    }
    
    .lang-en .grade-label {
        font-size: 14px !important;
    }
    
    .result-section h4 {
        font-size: 16px !important;
        margin-bottom: 12px !important;
    }
    
    .scale-item {
        margin-bottom: 10px !important;
    }
    
    .scale-name {
        font-size: 13px !important;
    }
    
    .scale-bar {
        height: 8px !important;
        margin: 0 8px !important;
    }
    
    .scale-status {
        font-size: 12px !important;
        width: 45px !important;
    }
    
    .adaptation-text {
        font-size: 16px !important;
    }
    
    .adaptation-value {
        font-size: 24px !important;
    }
    
    .result-summary {
        margin: 20px 0 !important;
        padding: 15px !important;
    }
    
    .result-summary h3 {
        font-size: 17px !important;
        margin-bottom: 10px !important;
    }
    
    .result-summary p {
        font-size: 14px !important;
    }
}

.footer {
    text-align: center;
    padding: 20px;
    background: linear-gradient(180deg, #f5f5f5 0%, #e8e8e8 100%);
    border-top: 1px solid #ddd;
    margin-top: 40px;
}

.footer p {
    font-size: 14px;
    color: #666;
    margin: 0;
}

.footer a {
    color: #0066cc;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: #004499;
    text-decoration: underline;
}