:root {
    --primary-color: #2c3e50; /* Dark Blue */
    --secondary-color: #3498db; /* Bright Blue */
    --accent-color: #e74c3c; /* Red for alerts/emphasis */
    --light-gray: #ecf0f1;
    --medium-gray: #bdc3c7;
    --dark-gray: #7f8c8d;
    --text-color: #333;
    --white-color: #fff;
    --container-width: 1100px;
    --header-height: 70px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white-color);
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: var(--primary-color);
    color: var(--white-color);
    padding: 0 20px;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    height: var(--header-height);
    display: flex;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.8em;
    font-weight: 700;
    color: var(--white-color);
    text-decoration: none;
}

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

.nav-menu ul li {
    margin-left: 20px;
}

.nav-menu ul li a {
    color: var(--white-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    font-size: 0.95em;
}

.nav-menu ul li a:hover,
.nav-menu ul li a.active {
    color: var(--secondary-color);
}

.hamburger-menu {
    display: none;
    background: none;
    border: none;
    color: var(--white-color);
    font-size: 1.8em;
    cursor: pointer;
}

/* Hero Section */
.hero {
    background-color: var(--light-gray);
    padding: calc(var(--header-height) + 60px) 0 60px;
    text-align: center;
}

.hero h1 {
    font-size: 2.8em;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.hero-subtitle {
    font-size: 1.4em;
    color: var(--dark-gray);
    margin-bottom: 30px;
    font-weight: 500;
}

.hero-image {
    max-width: 100%;
    height: auto;
    max-height: 400px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.hero-cta {
    margin-top: 30px;
}

.hero-cta p {
    font-size: 1.2em;
    margin-bottom: 20px;
}

.cta-button {
    display: inline-block;
    background-color: var(--secondary-color);
    color: var(--white-color);
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s, transform 0.3s;
    box-shadow: 0 4px 8px rgba(52, 152, 219, 0.3);
}

.cta-button:hover {
    background-color: #2980b9;
    transform: translateY(-3px);
}

/* Intro Section */
.intro-section {
    padding: 60px 0;
    background-color: var(--white-color);
}

.intro-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.intro-content h2 {
    font-size: 2.2em;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.intro-content p {
    font-size: 1.1em;
    color: var(--text-color);
    margin-bottom: 20px;
    line-height: 1.8;
}

.stats-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
    margin-top: 40px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    min-width: 180px;
}

.stat-number {
    font-size: 2.5em;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 5px;
}

.stat-text {
    color: var(--dark-gray);
    font-size: 1em;
}

/* Services Section */
.services-section {
    padding: 60px 0;
    text-align: center;
    background-color: var(--light-gray);
}

.services-section h2 {
    font-size: 2.2em;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.services-section .subtitle {
    font-size: 1.1em;
    color: var(--dark-gray);
    margin-bottom: 40px;
}

.service-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.service-card {
    background-color: var(--white-color);
    border: 1px solid var(--medium-gray);
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: left;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 15px rgba(0,0,0,0.1);
}

.service-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 6px;
    margin-bottom: 15px;
}

.service-card h3 {
    font-size: 1.5em;
    color: var(--secondary-color);
    margin-bottom: 10px;
    text-align: center;
}

.service-card p {
    margin-bottom: 15px;
    color: var(--text-color);
}

.service-features {
    list-style: none;
    margin-top: 15px;
    border-top: 1px dashed var(--medium-gray);
    padding-top: 15px;
}

.service-features li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 8px;
    font-size: 0.95em;
}

.service-features li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

.additional-services {
    margin-top: 60px;
}

.additional-services h3 {
    font-size: 1.8em;
    color: var(--primary-color);
    margin-bottom: 30px;
}

.additional-service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
}

.additional-service-item {
    background-color: var(--white-color);
    padding: 25px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.additional-service-item i {
    font-size: 2.5em;
    color: var(--secondary-color);
    margin-bottom: 15px;
}

.additional-service-item h4 {
    font-size: 1.3em;
    color: var(--primary-color);
    margin-bottom: 10px;
}

/* Verification Section */
.verification-section {
    padding: 60px 0;
    text-align: center;
}

.verification-section h2 {
    font-size: 2.2em;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.verification-section .subtitle {
    font-size: 1.1em;
    color: var(--dark-gray);
    margin-bottom: 40px;
}

.verification-process {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
    margin-bottom: 40px;
}

.verification-step {
    background-color: var(--light-gray);
    padding: 25px;
    border-radius: 8px;
    max-width: 300px;
    position: relative;
}

.step-number {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    background-color: var(--secondary-color);
    color: var(--white-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2em;
}

.verification-step h3 {
    margin-top: 10px;
    font-size: 1.3em;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.verification-image {
    max-width: 600px;
    width: 100%;
    margin: 40px auto;
    display: block;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.verification-guarantee {
    background-color: var(--primary-color);
    color: var(--white-color);
    padding: 25px;
    border-radius: 8px;
    max-width: 800px;
    margin: 0 auto;
}

.verification-guarantee h3 {
    font-size: 1.5em;
    margin-bottom: 15px;
}

/* DB List Section */
.db-list-section {
    padding: 60px 0;
    background-color: var(--light-gray);
}

.db-list-section h2 {
    text-align: center;
    font-size: 2.2em;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.db-list-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 40px;
    color: var(--dark-gray);
    font-size: 1.1em;
}

.db-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.db-category {
    background-color: var(--white-color);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--medium-gray);
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.db-category h3 {
    font-size: 1.3em;
    color: var(--secondary-color);
    margin-bottom: 15px;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 8px;
}

.db-category ul {
    list-style: none;
}

.db-category ul li {
    margin-bottom: 12px;
    font-size: 0.95em;
    color: var(--text-color);
    line-height: 1.4;
}

.db-category ul li strong {
    color: var(--primary-color);
    font-weight: 600;
}

.db-category ul li::before {
    content: "✓";
    color: var(--secondary-color);
    margin-right: 8px;
    font-weight: bold;
}

.keyword-cloud {
    background-color: var(--white-color);
    padding: 25px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.keyword-cloud h3 {
    font-size: 1.3em;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.keywords {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

.keyword {
    background-color: var(--light-gray);
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.9em;
    color: var(--primary-color);
    transition: background-color 0.3s, transform 0.3s;
}

.keyword:hover {
    background-color: var(--secondary-color);
    color: var(--white-color);
    transform: translateY(-3px);
}

/* Features Section */
.features-section {
    padding: 60px 0;
    text-align: center;
    background-color: var(--white-color);
}

.features-section h2 {
    font-size: 2.2em;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.features-section .subtitle {
    font-size: 1.1em;
    color: var(--dark-gray);
    margin-bottom: 40px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.feature-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.feature-item {
    background-color: var(--light-gray);
    padding: 25px;
    border-radius: 8px;
    border: 1px solid var(--medium-gray);
    transition: transform 0.3s;
}

.feature-item:hover {
    transform: translateY(-5px);
}

.feature-item i {
    font-size: 2.5em;
    color: var(--secondary-color);
    margin-bottom: 15px;
}

.feature-item h3 {
    font-size: 1.3em;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.advanced-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.advanced-feature {
    background-color: var(--primary-color);
    color: var(--white-color);
    padding: 25px;
    border-radius: 8px;
    transition: transform 0.3s;
}

.advanced-feature:hover {
    transform: translateY(-5px);
}

.advanced-feature i {
    font-size: 2em;
    color: var(--light-gray);
    margin-bottom: 15px;
}

.advanced-feature h3 {
    font-size: 1.2em;
    margin-bottom: 10px;
}

/* Process Section */
.process-section {
    padding: 60px 0;
    background-color: var(--light-gray);
}

.process-section h2 {
    text-align: center;
    font-size: 2.2em;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.process-section .subtitle {
    text-align: center;
    font-size: 1.1em;
    color: var(--dark-gray);
    margin-bottom: 50px;
}

.process-steps {
    max-width: 800px;
    margin: 0 auto 50px;
}

.process-step {
    display: flex;
    margin-bottom: 40px;
    position: relative;
}

.process-step:not(:last-child):after {
    content: "";
    position: absolute;
    left: 25px;
    top: 70px;
    bottom: -20px;
    width: 2px;
    background-color: var(--medium-gray);
}

.process-icon {
    background-color: var(--secondary-color);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white-color);
    font-size: 1.2em;
    margin-right: 25px;
    flex-shrink: 0;
    z-index: 2;
}

.process-content {
    flex-grow: 1;
}

.process-content h3 {
    font-size: 1.3em;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.satisfaction-guarantee {
    background-color: var(--white-color);
    padding: 25px;
    border-radius: 8px;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.satisfaction-guarantee i {
    font-size: 2.5em;
    color: #f1c40f; /* Gold color */
    margin-bottom: 15px;
}

.satisfaction-guarantee h3 {
    font-size: 1.5em;
    color: var(--primary-color);
    margin-bottom: 10px;
}

/* Testimonials Section */
.testimonials-section {
    padding: 60px 0;
    text-align: center;
}

.testimonials-section h2 {
    font-size: 2.2em;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.testimonials-section .subtitle {
    font-size: 1.1em;
    color: var(--dark-gray);
    margin-bottom: 40px;
}

.testimonial-slider {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.testimonial {
    background-color: var(--light-gray);
    padding: 25px;
    border-radius: 8px;
    text-align: left;
}

.testimonial-content {
    margin-bottom: 20px;
    font-style: italic;
    position: relative;
    padding: 0 20px;
}

.testimonial-content:before,
.testimonial-content:after {
    content: '"';
    font-size: 2em;
    color: var(--secondary-color);
    position: absolute;
    opacity: 0.3;
}

.testimonial-content:before {
    top: -20px;
    left: 0;
}

.testimonial-content:after {
    bottom: -35px;
    right: 0;
}

.testimonial-author {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.testimonial-author h4 {
    font-size: 1.1em;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.testimonial-author p {
    font-size: 0.9em;
    color: var(--dark-gray);
    margin-bottom: 10px;
}

.rating {
    color: #f1c40f; /* Gold color for stars */
}

/* FAQ Section */
.faq-section {
    padding: 60px 0;
    background-color: var(--light-gray);
}

.faq-section h2 {
    text-align: center;
    font-size: 2.2em;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.faq-section .subtitle {
    text-align: center;
    font-size: 1.1em;
    color: var(--dark-gray);
    margin-bottom: 40px;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--white-color);
    border-radius: 8px;
    margin-bottom: 15px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    overflow: hidden;
}

.faq-question {
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    background-color: var(--white-color);
    transition: background-color 0.3s;
}

.faq-question:hover {
    background-color: #f8f9fa;
}

.faq-question h3 {
    font-size: 1.1em;
    color: var(--primary-color);
    margin: 0;
}

.faq-question i {
    color: var(--secondary-color);
    transition: transform 0.3s;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.6s, padding 0.6s;
}

.faq-item.active .faq-answer {
    padding: 0 20px 20px;
    max-height: 1000px; /* Arbitrary large value */
}

/* Contact Section */
.contact-section {
    padding: 60px 0;
    background-color: var(--primary-color);
    color: var(--white-color);
    text-align: center;
}

.contact-section h2 {
    font-size: 2.2em;
    margin-bottom: 10px;
}

.contact-section .subtitle {
    font-size: 1.1em;
    color: var(--light-gray);
    margin-bottom: 40px;
}

.contact-methods {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
    margin-bottom: 30px;
}

.contact-method {
    background-color: rgba(255,255,255,0.1);
    padding: 25px;
    border-radius: 8px;
    min-width: 300px;
}

.contact-method i {
    font-size: 2.5em;
    margin-bottom: 15px;
}

.contact-method h3 {
    font-size: 1.3em;
    margin-bottom: 10px;
}

.contact-method a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 500;
}

.contact-method a:hover {
    text-decoration: underline;
}

.contact-desc {
    margin-top: 15px;
    font-size: 0.9em;
    color: var(--light-gray);
}

.response-time {
    font-weight: bold;
    margin: 20px 0;
}

.contact-notes {
    max-width: 800px;
    margin: 0 auto;
}

.warning {
    color: var(--accent-color);
    font-weight: bold;
    margin-bottom: 15px;
}

.promo {
    font-size: 1.2em;
    color: #f1c40f; /* Yellow for promo */
    font-weight: bold;
    margin-bottom: 20px;
}

.motto {
    font-style: italic;
    margin-top: 25px;
    font-size: 1.1em;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.2);
}

/* Footer */
footer {
    background-color: #1c2833; /* Darker blue */
    color: var(--medium-gray);
    padding: 50px 0 25px;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin-bottom: 40px;
}

.footer-logo {
    margin-bottom: 20px;
}

.footer-logo h3 {
    font-size: 1.8em;
    color: var(--white-color);
    margin-bottom: 10px;
}

.footer-logo p {
    color: var(--medium-gray);
}

.footer-links h4,
.footer-contact h4 {
    color: var(--white-color);
    margin-bottom: 15px;
    font-size: 1.2em;
}

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

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

.footer-links ul li a {
    color: var(--medium-gray);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links ul li a:hover {
    color: var(--white-color);
}

.footer-contact p {
    margin-bottom: 10px;
}

.footer-contact a {
    color: var(--secondary-color);
    text-decoration: none;
}

.footer-contact a:hover {
    text-decoration: underline;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-bottom p {
    margin-bottom: 10px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .logo {
        font-size: 1.5em;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background-color: var(--primary-color);
        flex-direction: column;
        padding: 15px 0;
        box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu ul {
        flex-direction: column;
        width: 100%;
    }

    .nav-menu ul li {
        margin: 10px 0;
        text-align: center;
    }

    .hamburger-menu {
        display: block;
    }

    .hero h1 {
        font-size: 2.2em;
    }
    
    .hero-subtitle {
        font-size: 1.2em;
    }

    .services-section h2,
    .db-list-section h2,
    .features-section h2,
    .contact-section h2,
    .testimonials-section h2,
    .faq-section h2,
    .process-section h2,
    .verification-section h2,
    .intro-section h2 {
        font-size: 1.8em;
    }

    .service-cards,
    .db-categories,
    .feature-items,
    .advanced-features,
    .testimonial-slider {
        grid-template-columns: 1fr;
    }

    .process-step {
        flex-direction: column;
    }

    .process-icon {
        margin-bottom: 15px;
        margin-right: 0;
    }

    .process-step:not(:last-child):after {
        display: none;
    }

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

    .stat-item {
        width: 100%;
    }

    .footer-content > div {
        width: 100%;
        margin-bottom: 30px;
    }
}

/* Animation */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fadeIn {
    animation: fadeIn 1s ease-in-out;
}