/* ===== CSS 변수 ===== */
:root {
    --bg-primary: #090916;
    --bg-secondary: #1a122e;
    --bg-gradient: linear-gradient(135deg, #090916 0%, #1a122e 50%, #0f0a1f 100%);

    --accent-primary: #9a77ff;
    --accent-secondary: #6a4bff;
    --accent-gradient: linear-gradient(135deg, #9a77ff 0%, #6a4bff 100%);

    --text-primary: #f5f5ff;
    --text-secondary: #b8b8d0;
    --text-muted: #6b6b8a;

    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --card-hover: rgba(255, 255, 255, 0.08);

    --border-radius: 18px;
    --border-radius-sm: 12px;

    --transition: all 0.3s ease;
}

/* ===== 리셋 & 기본 스타일 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-gradient);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

ul {
    list-style: none;
}

/* ===== 네비게이션 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(9, 9, 22, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--card-border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

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

.nav-menu a {
    color: var(--text-secondary);
    transition: var(--transition);
    font-weight: 500;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* ===== 섹션 공통 스타일 ===== */
section {
    padding: 100px 2rem;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

/* ===== 히어로 섹션 ===== */
.hero-section {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3rem;
    padding: 100px 2rem 60px;
    max-width: 1200px;
    margin: 0 auto;
}

.hero-content {
    text-align: center;
    max-width: 800px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.hero-title .highlight {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.store-badge {
    display: inline-block;
    transition: var(--transition);
}

.store-badge:hover {
    transform: translateY(-3px);
}

.store-badge img {
    height: 90px;
    width: auto;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 20px rgba(154, 119, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(154, 119, 255, 0.4);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(10px);
}

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

.hero-video {
    width: 100%;
    max-width: 900px;
    border-radius: 18px;
    overflow: hidden;
    box-shadow: 0 25px 80px rgba(0, 0, 0, 0.5);
}

.hero-video img,
.hero-video video {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 18px;
    aspect-ratio: 16 / 9;
    object-fit: cover;
}

.placeholder-text {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ===== 핵심 기능 섹션 ===== */
.features-section {
    background: rgba(0, 0, 0, 0.2);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    background: var(--card-hover);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ===== 갤러리 섹션 ===== */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.gallery-item {
    text-align: center;
}

.gallery-image {
    aspect-ratio: 1290 / 2796;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.gallery-image:hover {
    transform: scale(1.03);
    box-shadow: 0 15px 40px rgba(154, 119, 255, 0.2);
    border-color: var(--accent-primary);
}

.gallery-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.gallery-grid {
    justify-content: center;
}

/* ===== 사용법 섹션 ===== */
.howto-section {
    background: rgba(0, 0, 0, 0.2);
}

.steps-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.step-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: var(--transition);
    position: relative;
}

.step-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
}

.step-number {
    width: 50px;
    height: 50px;
    background: var(--accent-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1.5rem;
}

.step-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.step-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== 고객 지원 섹션 ===== */
.support-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.support-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.support-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
}

.support-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.support-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

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

/* ===== 푸터 ===== */
.footer {
    background: rgba(0, 0, 0, 0.4);
    border-top: 1px solid var(--card-border);
    padding: 4rem 2rem 2rem;
}

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

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.footer-brand p {
    color: var(--text-secondary);
}

.footer-brand .developer {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

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

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-links a {
    color: var(--text-secondary);
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--card-border);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ===== 반응형 디자인 ===== */
@media (max-width: 1024px) {
    .features-grid,
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-section {
        padding-top: 100px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(9, 9, 22, 0.95);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        border-bottom: 1px solid var(--card-border);
    }

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

    .nav-toggle {
        display: flex;
    }

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

    .steps-container,
    .support-content {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .features-grid,
    .gallery-grid {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}