:root {
    --bg-color: #0a0e17;
    --text-color: #ffffff;
    --text-secondary: #a0a0a0;
    --primary-color: #3b82f6;
    --accent-color: #8b5cf6;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --font-main: 'Noto Sans KR', sans-serif;
    --font-display: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
    word-break: keep-all;
}

a {
    text-decoration: none;
    color: inherit;
}

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

/* Navbar */
.navbar {
    padding: 20px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    background: rgba(10, 14, 23, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--card-border);
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.5rem;
    background: linear-gradient(to right, var(--primary-color), var(--accent-color));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-links a {
    font-weight: 500;
    transition: color 0.3s;
}

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

.btn-download {
    background: white;
    color: black !important;
    padding: 10px 20px;
    border-radius: 20px;
    font-weight: 700 !important;
    transition: transform 0.2s;
}

.btn-download:hover {
    transform: scale(1.05);
}

/* Hero Section */
.hero {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    position: relative;
    overflow: hidden;
}

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

.hero-content {
    flex: 1;
    z-index: 2;
}

.hero-title {
    font-size: 4rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 20px;
}

.highlight {
    background: linear-gradient(120deg, var(--primary-color), var(--accent-color));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.hero-cta {
    display: flex;
    gap: 20px;
}

.btn-primary {
    background: linear-gradient(to right, var(--primary-color), var(--accent-color));
    color: white;
    padding: 15px 30px;
    border-radius: 30px;
    font-weight: 700;
    transition: opacity 0.3s;
}

.btn-primary:hover {
    opacity: 0.9;
}

.btn-secondary {
    border: 1px solid var(--card-border);
    padding: 15px 30px;
    border-radius: 30px;
    font-weight: 700;
    transition: background 0.3s;
}

.btn-secondary:hover {
    background: var(--card-bg);
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    position: relative;
}

.hero-image img {
    max-width: 100%;
    height: auto;
    border-radius: 20px;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.5));
    animation: float 6s ease-in-out infinite;
}

.glow-effect {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 300px;
    background: var(--primary-color);
    filter: blur(100px);
    opacity: 0.3;
    z-index: -1;
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-20px);
    }

    100% {
        transform: translateY(0px);
    }
}

/* Problem Solution */
.problem-solution {
    padding: 100px 0;
    background: linear-gradient(to bottom, var(--bg-color), #0f1420);
}

.text-center {
    text-align: center;
    margin-bottom: 60px;
}

.text-center h2 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.comparison {
    display: flex;
    gap: 40px;
    justify-content: center;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 40px;
    border-radius: 20px;
    width: 400px;
    backdrop-filter: blur(10px);
}

.card h3 {
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.card-bad ul {
    list-style: none;
}

.card-bad li {
    margin-bottom: 10px;
    color: var(--text-secondary);
}

.chat-demo {
    background: rgba(0, 0, 0, 0.3);
    padding: 20px;
    border-radius: 15px;
    margin-bottom: 20px;
}

.bubble {
    background: var(--primary-color);
    padding: 10px 15px;
    border-radius: 15px 15px 0 15px;
    display: inline-block;
    float: right;
    font-size: 0.9rem;
}

.result-text {
    clear: both;
    margin-top: 10px;
    color: #4ade80;
    font-weight: 600;
}

/* Features */
.features {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
}

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

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-10px);
}

.icon-wrapper {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    border-radius: 20px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
}

.icon-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.icon-placeholder {
    font-size: 2rem;
}

.feature-card h3 {
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.feature-card p {
    color: var(--text-secondary);
}

/* How it works */
.how-it-works {
    padding: 100px 0;
    background: rgba(255, 255, 255, 0.02);
}

.steps {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
}

.step {
    text-align: center;
    max-width: 250px;
}

.step-number {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 1.2rem;
    margin: 0 auto 20px;
}

.arrow {
    font-size: 2rem;
    color: var(--text-secondary);
}

/* Privacy Section */
.privacy-section {
    padding: 100px 0;
    background: linear-gradient(to top, var(--bg-color), #0f1420);
    border-top: 1px solid var(--card-border);
}

.privacy-icon {
    font-size: 4rem;
    margin-bottom: 20px;
    animation: float 4s ease-in-out infinite;
}

.privacy-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin: 20px 0 40px;
    word-break: keep-all;
}

.privacy-badges {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.badge {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid var(--primary-color);
    padding: 10px 20px;
    border-radius: 30px;
    color: var(--primary-color);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.check {
    font-weight: 900;
}

/* Footer */
footer {
    padding: 50px 0;
    border-top: 1px solid var(--card-border);
    text-align: center;
}

.footer-logo {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.2rem;
    margin-bottom: 10px;
}

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

/* Responsive */
@media (max-width: 768px) {
    .hero {
        padding-top: 100px;
        min-height: auto;
        padding-bottom: 50px;
    }

    .hero-container {
        flex-direction: column;
        text-align: center;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-cta {
        justify-content: center;
    }

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

    .card {
        width: 100%;
    }

    .steps {
        flex-direction: column;
    }

    .arrow {
        transform: rotate(90deg);
    }
}