:root {
    --primary: #0056b3;
    --secondary: #003d82;
    --accent: #ff6b00;
    --light: #f8f9fa;
    --dark: #212529;
    --gray: #6c757d;
    --success: #28a745;
    --warning: #ffc107;
    --danger: #dc3545;
}

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

body {
    line-height: 1.6;
    color: var(--dark);
    background-color: white;
}

.container {
    width: 100%;
    max-width: 1200px!important;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Navigation */
header {
    background-color: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
}

.logo h1 {
    font-size: 1.8rem;
    color: var(--primary);
    margin-left: 10px;
    font-weight: bold;
}

.logo span {
    color: var(--accent);
}

.logo span {
    color: var(--accent);
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 25px;
    position: relative;
}

nav ul li a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: var(--primary);
}

.dropdown-menu {
    display: none;
    position: absolute;
    background-color: white;
    min-width: 220px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
    border-radius: 4px;
    z-index: 1;
    top: 100%;
    left: 0;
}

.dropdown:hover .dropdown-menu {
    display: block;
}

.dropdown-menu li {
    margin: 0;
    width: 100%;
}

.dropdown-menu li a {
    display: block;
    padding: 12px 20px;
    border-bottom: 1px solid #f0f0f0;
}

.dropdown-menu li:last-child a {
    border-bottom: none;
}

.dropdown-menu li a:hover {
    background-color: #f8f9fa;
    color: var(--primary);
}

.cta-button {
    background-color: var(--accent);
    color: white;
    padding: 10px 20px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s;
}

.cta-button:hover {
    background-color: #e05a00;
}

/* Certificate Verification Section */
.certificate-verification {
    background: linear-gradient(rgba(0, 45, 98, 0.9), rgba(0, 45, 98, 0.9)), url('https://images.unsplash.com/photo-1581094794329-c8112a89af12?ixlib=rb-4.0.3') no-repeat center center/cover;
    color: white;
    padding: 80px 0;
    text-align: center;
}

.certificate-verification h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.certificate-verification p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 40px;
}

.verification-form {
    background-color: white;
    border-radius: 8px;
    padding: 40px;
    max-width: 600px;
    margin: 0 auto;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--dark);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-control:focus {
    border-color: var(--primary);
    outline: none;
}

.date-inputs {
    display: flex;
    gap: 15px;
}

.date-inputs .form-group {
    flex: 1;
}

.btn-primary {
    background-color: var(--accent);
    color: white;
    padding: 12px 30px;
    border: none;
    border-radius: 4px;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-block;
    text-decoration: none;
}

.btn-primary:hover {
    background-color: #e05a00;
    transform: translateY(-2px);
}

.btn-block {
    display: block;
    width: 100%;
}

/* Verification Results */
.verification-results {
    display: none;
    margin-top: 30px;
    text-align: left;
    background-color: #f8f9fa;
    border-radius: 8px;
    padding: 25px;
}

.result-valid {
    border-left: 4px solid var(--success);
}

.result-invalid {
    border-left: 4px solid var(--danger);
}

.result-warning {
    border-left: 4px solid var(--warning);
}

.result-title {
    font-size: 1.3rem;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.result-valid .result-title {
    color: var(--success);
}

.result-invalid .result-title {
    color: var(--danger);
}

.result-warning .result-title {
    color: var(--warning);
}

.result-title i {
    margin-right: 10px;
}

.result-details {
    color: var(--dark);
}

.result-details table {
    width: 100%;
    border-collapse: collapse;
}

.result-details table td {
    padding: 10px;
    border-bottom: 1px solid #e9ecef;
}

.result-details table tr:last-child td {
    border-bottom: none;
}

.result-details table td:first-child {
    font-weight: 600;
    width: 40%;
}

/* Additional Options */
.verification-options {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
    flex-wrap: wrap;
}

.option-card {
    background-color: rgba(255,255,255,0.1);
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    flex: 1;
    min-width: 200px;
    max-width: 250px;
    transition: transform 0.3s;
}

.option-card:hover {
    transform: translateY(-5px);
}

.option-card i {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: var(--accent);
}

.option-card h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

/* Footer */
footer {
    background-color: var(--dark);
    color: white;
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: var(--accent);
    font-weight: 700;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    color: #ddd;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-col ul li a:hover {
    color: white;
}

.contact-info {
    margin-top: 15px;
}

.contact-info p {
    margin-bottom: 10px;
    display: flex;
    align-items: flex-start;
}

.contact-info i {
    margin-right: 10px;
    color: var(--accent);
}

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #aaa;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        text-align: center;
    }

    nav ul {
        margin-top: 20px;
        flex-wrap: wrap;
        justify-content: center;
    }

    nav ul li {
        margin: 5px 10px;
    }

    .dropdown-menu {
        left: -50px;
    }

    .certificate-verification h2 {
        font-size: 2rem;
    }

    .verification-form {
        padding: 25px;
    }

    .verification-options {
        flex-direction: column;
        align-items: center;
    }

    .option-card {
        width: 100%;
        max-width: 300px;
    }

    .date-inputs {
        flex-direction: column;
        gap: 0;
    }
}

/* Validation Styles */
.validation-message {
    font-size: 0.9rem;
    margin-top: 5px;
    display: none;
}

.validation-error {
    color: var(--danger);
}

.validation-success {
    color: var(--success);
}

.form-control.error {
    border-color: var(--danger);
}

.form-control.success {
    border-color: var(--success);
}

.loading {
    display: none;
    text-align: center;
    margin: 20px 0;
}

.loading-spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Additional Information Section */
.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 2.2rem;
    color: var(--primary);
    margin-bottom: 15px;
    font-weight: 700;
}

.section-title p {
    color: var(--gray);
    max-width: 700px;
    margin: 0 auto;
}

.intro-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.intro-text h3 {
    font-size: 1.8rem;
    color: var(--primary);
    margin-bottom: 20px;
    font-weight: 700;
}

.intro-text p {
    margin-bottom: 20px;
}

.intro-text ul {
    margin: 15px 0 15px 30px;
}

.intro-text ul li {
    margin-bottom: 8px;
}

.intro-image {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.intro-image img {
    width: 100%;
    height: auto;
    display: block;
}

/*轮播*/

.carousel-container {
    position: relative;
    max-width: 800px;
    margin: auto;
    overflow: hidden;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}
.carousel-slide {
    display: none;
    transition: opacity 0.5s ease-in-out;
}
.carousel-slide.active {
    display: block;
}
.carousel-indicators {
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 0.5rem;
}
.indicator-dot {
    width: 12px;
    height: 12px;
    background-color: #ccc;
    border-radius: 50%;
    cursor: pointer;
    transition: background-color 0.3s;
}
.indicator-dot.active {
    background-color: #4f46e5;
}
.carousel-control {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(0,0,0,0.3);
    color: white;
    padding: 0.5rem;
    font-size: 1.5rem;
    border-radius: 50%;
    cursor: pointer;
    user-select: none;
    transition: background-color 0.3s;
}
.carousel-control:hover {
    background-color: rgba(0,0,0,0.6);
}
.prev-btn {
    left: 1rem;
}
.next-btn {
    right: 1rem;
}

.carousel-slide .object-cover {
    /*width: 500px;*/
    width: 100%;
}