:root {
    --primary-color: #2E7D32;
    /* Technical Green */
    --secondary-color: #4CAF50;
    /* Lighter Green */
    --accent-color: #81C784;
    --text-color: #333333;
    --light-text: #666666;
    --bg-white: #FFFFFF;
    /* Clean White */
    --bg-light: #F8F9FA;
    --border-color: #E0E0E0;
}

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

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

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

/* Header */
header {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    height: 70px;
    display: flex;
    align-items: center;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

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

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

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color);
}

/* Hero Section */
#hero {
    height: 100vh;
    background: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)), url('hero-bg.png');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    text-align: center;
    color: white;
    padding-top: 70px;
}

.hero-content {
    width: 100%;
}

#hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

#hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: 2px solid var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: white;
}

/* Sections General */
section {
    padding: 80px 0;
}

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

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

.section-title p {
    color: var(--light-text);
    font-size: 1.1rem;
}

/* Features Section */
#features {
    background-color: var(--bg-white);
}

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

.feature-card {
    background: var(--bg-light);
    padding: 40px;
    border-radius: 15px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
}

.icon-box {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 15px;
    font-size: 1.5rem;
}

/* Collaboration Section */
#collaboration {
    background-color: var(--bg-light);
}

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

.collab-item {
    text-align: center;
    padding: 30px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.03);
}

.collab-icon {
    width: 80px;
    height: 80px;
    background-color: rgba(46, 125, 50, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: var(--primary-color);
    font-size: 2rem;
}

.collab-item h3 {
    margin-bottom: 15px;
    color: var(--text-color);
}

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

/* Footer */
footer {
    background-color: #1a1a1a;
    color: white;
    padding: 40px 0;
    text-align: center;
}

footer p {
    margin: 5px 0;
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 768px) {
    #hero h1 {
        font-size: 2rem;
    }

    .mobile-menu-btn {
        display: block;
    }

    nav {
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        padding: 20px;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
        display: none;
    }

    nav.active {
        display: block;
    }

    nav ul {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
}

/* Q&A Sample Box */
.qa-sample {
    margin-top: 20px;
    background-color: rgba(46, 125, 50, 0.05);
    padding: 15px;
    border-radius: 10px;
    text-align: left;
    font-size: 0.95rem;
    border-left: 4px solid var(--primary-color);
}

.qa-sample p {
    margin-bottom: 5px;
    color: var(--text-color);
}

.qa-sample .question {
    font-weight: 700;
    color: var(--primary-color);
}

.qa-sample .answer {
    color: var(--light-text);
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-4 {
    margin-top: 1.5rem;
}

.mt-5 {
    margin-top: 3rem;
}

.my-5 {
    margin-top: 3rem;
    margin-bottom: 3rem;
}

.lead {
    font-size: 1.25rem;
    font-weight: 300;
}

/* QA Essence Section */
#qa-essence {
    background-color: #fff;
    padding: 100px 0;
}

.qa-content {
    max-width: 800px;
    margin: 0 auto;
}

.qa-content h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 10px;
    display: inline-block;
}

.qa-content ul,
.qa-content ol {
    margin-left: 20px;
    margin-bottom: 2rem;
}

.qa-content li {
    margin-bottom: 10px;
}

.qa-content strong {
    color: var(--primary-color);
}0, 0.05);
    padding: 15px;
    border-radius: 10px;
    text-align: left;
    font-size: 0.95rem;
    border-left: 4px solid var(--primary-color);
}

.qa-sample p {
    margin-bottom: 5px;
    color: var(--text-color);
}

.qa-sample .question {
    font-weight: 700;
    color: var(--primary-color);
}

.qa-sample .answer {
    color: var(--light-text);
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-4 {
    margin-top: 1.5rem;
}

.mt-5 {
    margin-top: 3rem;
}

.my-5 {
    margin-top: 3rem;
    margin-bottom: 3rem;
}

.lead {
    font-size: 1.25rem;
    font-weight: 300;
}

/* QA Essence Section */
#qa-essence {
    background-color: #fff;
    padding: 100px 0;
}

.qa-content {
    max-width: 800px;
    margin: 0 auto;
}

.qa-content h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 10px;
    display: inline-block;
}

.qa-content ul,
.qa-content ol {
    margin-left: 20px;
    margin-bottom: 2rem;
}

.qa-content li {
    margin-bottom: 10px;
}

.qa-content strong {
    color: var(--primary-color);
}