:root {
    --bg-color: #111111;
    --card-bg: #1E1E1E;
    --border-color: #333333;
    --text-primary: #FFFFFF;
    --text-secondary: #888888;
    --accent-color: #C9A45C;
    --accent-hover: #DDB870;
}

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

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: var(--accent-color);
    transition: color 0.3s;
}

a:hover {
    color: var(--accent-hover);
}

/* Header */
header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-color);
    letter-spacing: 2px;
}

.nav-links a {
    margin-left: 20px;
    color: var(--text-primary);
    font-size: 1rem;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--accent-color);
}

/* Main Content */
.container {
    max-width: 800px;
    margin: 60px auto;
    padding: 0 20px;
}

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

.title {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 300;
}

.subtitle {
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-size: 1.1rem;
}

/* Query Box */
.query-box {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

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

.query-input {
    flex: 1;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 15px 20px;
    font-size: 1.2rem;
    border-radius: 4px 0 0 4px;
    outline: none;
    transition: border-color 0.3s;
}

.query-input:focus {
    border-color: var(--accent-color);
}

.query-btn {
    background-color: var(--accent-color);
    color: var(--bg-color);
    border: none;
    padding: 0 30px;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    transition: background-color 0.3s;
}

.query-btn:hover {
    background-color: var(--accent-hover);
}

.help-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-align: left;
}

/* Result Area */
#result-area {
    margin-top: 30px;
    display: none;
    border-top: 1px solid var(--border-color);
    padding-top: 30px;
}

.result-success {
    color: #4caf50;
    font-size: 1.5rem;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.result-error {
    color: #f44336;
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.cert-image {
    max-width: 100%;
    border: 2px solid var(--accent-color);
    border-radius: 4px;
    margin-top: 20px;
}

.info-list {
    text-align: left;
    margin-top: 20px;
    color: var(--text-secondary);
}

.info-list li {
    list-style: none;
    margin-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 5px;
}

.info-list span {
    color: var(--text-primary);
    float: right;
}

/* Intro Section */
.intro-section {
    margin-top: 80px;
}

.section-title {
    font-size: 1.8rem;
    color: var(--text-primary);
    margin-bottom: 40px;
    font-weight: 300;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 2px;
    background-color: var(--accent-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 80px;
}

.feature-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 30px 20px;
    transition: transform 0.3s, border-color 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
}

.feature-icon {
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.process-steps {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-top: 40px;
    padding: 0 20px;
}

.step-item {
    flex: 1;
    text-align: center;
    position: relative;
}

.step-number {
    width: 50px;
    height: 50px;
    line-height: 50px;
    border-radius: 50%;
    background-color: var(--card-bg);
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0 auto 20px;
}

.step-item h4 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.step-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.step-line {
    flex: 0 0 100px;
    height: 2px;
    background-color: var(--border-color);
    margin-top: 25px;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 5px;
    margin-top: 30px;
    flex-wrap: wrap;
}

.page-item {
    padding: 8px 12px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 4px;
    font-size: 0.9rem;
    transition: all 0.3s;
}

.page-item:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.page-item.active {
    background-color: var(--accent-color);
    color: var(--bg-color);
    border-color: var(--accent-color);
    font-weight: bold;
}

.page-item.disabled {
    opacity: 0.5;
    pointer-events: none;
    cursor: not-allowed;
}

/* Loading Animation */
.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px 0;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(201, 164, 92, 0.3); /* 半透明的金色 */
    border-radius: 50%;
    border-top-color: var(--accent-color); /* 实心金色 */
    animation: spin 1s ease-in-out infinite;
    margin-bottom: 15px;
}

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

.loading-text {
    color: var(--accent-color);
    font-size: 1.1rem;
    letter-spacing: 2px;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* About Us Content Style */
#about-us-content {
    animation: fadeIn 0.5s ease-in-out;
}

.about-rich-content {
    padding: 10px 20px;
    background: linear-gradient(145deg, rgba(30,30,30,0.8) 0%, rgba(20,20,20,0.9) 100%);
    border-radius: 12px;
    border: 1px solid rgba(201, 164, 92, 0.15);
    box-shadow: inset 0 0 20px rgba(0,0,0,0.5);
}

.about-subtitle {
    color: var(--accent-color);
    font-size: 1.3rem;
    margin: 30px 0 15px 0;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(201, 164, 92, 0.2);
    font-weight: 400;
    letter-spacing: 1px;
}

.about-subtitle:first-child {
    margin-top: 10px;
}

.about-list-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 12px;
    padding-left: 5px;
    line-height: 1.6;
    transition: transform 0.2s;
}

.about-list-item:hover {
    transform: translateX(5px);
    color: var(--text-primary);
}

.about-bullet {
    display: inline-block;
    min-width: 8px;
    height: 8px;
    background-color: var(--accent-color);
    border-radius: 50%;
    margin-top: 10px;
    margin-right: 15px;
    box-shadow: 0 0 5px var(--accent-color);
}

.about-spacing {
    height: 20px;
}

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

/* Footer */
footer {
    text-align: center;
    padding: 40px 0;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
    margin-top: 60px;
}

/* Responsive */
@media (max-width: 768px) {
    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .process-steps {
        flex-direction: column;
        align-items: center;
    }
    
    .step-line {
        width: 2px;
        height: 40px;
        flex: none;
        margin: 15px 0;
    }

    .input-group {
        flex-direction: column;
    }
    .query-input {
        border-radius: 4px;
        margin-bottom: 10px;
    }
    .query-btn {
        border-radius: 4px;
        padding: 15px;
    }
}