/* 전역 스타일 */
:root {
    --primary-color: #0085db;
    --primary-light: #3ba3e9;
    --primary-dark: #0069af;
    --background-color: #04070B;
    --text-color: #ffffff;
    --secondary-text: #b0b7c3;
    --card-bg: #0a1218;
    --gradient-1: linear-gradient(45deg, var(--primary-color), #00a0ff);
    --gradient-2: linear-gradient(135deg, var(--primary-color), #5e00ff);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3.5rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 1.5rem;
}

h2 {
    font-size: 2.5rem;
    color: var(--text-color);
}

h3 {
    font-size: 1.5rem;
    color: var(--text-color);
}

p {
    margin-bottom: 1rem;
    color: var(--secondary-text);
}

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

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

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem;
}

.section-header p {
    font-size: 1.2rem;
}

/* Header & Navigation */
header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: rgba(4, 7, 11, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    max-width: 1400px;
    margin: 0 auto;
}

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

.logo-icon {
    height: 40px;
    margin-right: 10px;
}

.logo-text {
    height: 25px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
}

.nav-buttons {
    display: flex;
    gap: 1rem;
}

.login-btn {
    padding: 0.5rem 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
}

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

.signup-btn {
    padding: 0.5rem 1.5rem;
    background-color: var(--primary-color);
    border-radius: 4px;
    color: white;
}

.signup-btn:hover {
    background-color: var(--primary-light);
}

/* Hero Section */
.hero {
    display: flex;
    min-height: calc(100vh - 80px);
    padding: 5rem 5%;
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    align-items: center;
}

.hero-content {
    flex: 1;
    max-width: 600px;
    z-index: 2;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2.5rem;
    color: var(--secondary-text);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.primary-btn {
    padding: 0.8rem 2rem;
    background-color: var(--primary-color);
    border-radius: 4px;
    color: white;
    font-weight: 600;
}

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

.secondary-btn {
    padding: 0.8rem 2rem;
    border: 1px solid var(--primary-color);
    border-radius: 4px;
    color: var(--primary-color);
    font-weight: 600;
}

.secondary-btn:hover {
    background-color: rgba(0, 133, 219, 0.1);
}

.hero-image {
    flex: 1;
    position: relative;
    height: 500px;
}

.gradient-sphere {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 133, 219, 0.2) 0%, rgba(4, 7, 11, 0) 70%);
    animation: pulse 8s infinite alternate;
    z-index: 1;
}

@keyframes pulse {
    0% {
        transform: translate(-50%, -50%) scale(0.8);
        opacity: 0.5;
    }
    100% {
        transform: translate(-50%, -50%) scale(1.2);
        opacity: 0.8;
    }
}

/* Product Section */
.product {
    padding: 6rem 5%;
    max-width: 1400px;
    margin: 0 auto;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--card-bg);
    border-radius: 8px;
    padding: 2rem;
    transition: transform 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

/* How it works section */
.how-it-works {
    padding: 6rem 5%;
    max-width: 1400px;
    margin: 0 auto;
    background: linear-gradient(180deg, var(--background-color) 0%, rgba(0, 133, 219, 0.05) 100%);
}

.steps-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.step {
    text-align: center;
    padding: 2rem;
}

.step-number {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0 auto 1.5rem;
}

/* Use Cases */
.use-cases {
    padding: 6rem 5%;
    max-width: 1400px;
    margin: 0 auto;
}

.use-case-slider {
    display: flex;
    overflow-x: auto;
    gap: 2rem;
    padding-bottom: 2rem;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) var(--card-bg);
}

.use-case-card {
    min-width: 300px;
    background-color: var(--card-bg);
    border-radius: 8px;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

/* Company section */
.company {
    padding: 6rem 5%;
    max-width: 1400px;
    margin: 0 auto;
}

.company-content {
    display: flex;
    gap: 4rem;
    align-items: center;
}

.company-image {
    flex: 1;
}

.image-placeholder {
    width: 100%;
    height: 400px;
    background: linear-gradient(45deg, rgba(0, 133, 219, 0.1), rgba(0, 133, 219, 0.2));
    border-radius: 8px;
    position: relative;
    overflow: hidden;
}

.image-placeholder::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.1) 0%, rgba(4, 7, 11, 0) 70%);
}

.company-text {
    flex: 1;
}

/* CTA Section */
.cta {
    padding: 6rem 5%;
    margin: 5rem 0 0;
    background: linear-gradient(135deg, rgba(0, 133, 219, 0.2), rgba(4, 7, 11, 1));
}

.cta-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

/* Footer */
footer {
    padding: 4rem 5% 2rem;
    background-color: rgba(4, 7, 11, 0.8);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.footer-logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
}

.footer-logo-icon {
    height: 30px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 2rem;
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.footer-column h4 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

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

.footer-column a:hover {
    color: var(--primary-color);
}

/* 반응형 디자인 */
@media (max-width: 992px) {
    h1 {
        font-size: 2.8rem;
    }
    
    .hero {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content {
        max-width: 100%;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .company-content {
        flex-direction: column;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    h1 {
        font-size: 2.2rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .section-header {
        margin-bottom: 2rem;
    }
    
    .feature-grid, .steps-container {
        grid-template-columns: 1fr;
    }
}