:root {
    --primary-color: #4a90e2;
    --secondary-color: #7ed321;
    --accent-color: #f5a623;
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --text-white: #f8fafc;
    --text-gray: #94a3b8;
    --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    --shadow-premium: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
    --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header & Nav */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    transition: var(--transition-smooth);
    padding: 1rem 0;
}

header.scrolled {
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    padding: 0.5rem 0;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 800;
    font-size: 1.5rem;
    letter-spacing: -0.025em;
}

#nav-logo {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    object-fit: cover;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-white);
    font-weight: 400;
    transition: var(--transition-smooth);
}

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

/* Hero Section */
.hero-section {
    min-height: 100vh;
    padding-top: 8rem;
    background: var(--gradient-hero);
    position: relative;
    display: flex;
    align-items: center;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content h1 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    font-weight: 800;
}

.highlight {
    background: linear-gradient(to right, #60a5fa, #a855f7, #f43f5e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-gray);
    margin-bottom: 2.5rem;
    max-width: 500px;
}

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

.store-btn {
    transition: var(--transition-smooth);
}

.store-btn:hover {
    transform: translateY(-5px) scale(1.05);
}

.store-btn img {
    height: 50px;
}

.hero-image-wrapper {
    position: relative;
}

.hero-mockup {
    width: 100%;
    max-width: 350px;
    margin: 0 auto;
    display: block;
    border-radius: 30px;
    box-shadow: var(--shadow-premium);
    position: relative;
    z-index: 2;
}

.hero-decoration {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120%;
    height: 120%;
    background: radial-gradient(circle, rgba(74, 144, 226, 0.2) 0%, transparent 70%);
    z-index: 1;
}

/* Features Section */
.features-section {
    padding: 8rem 0;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 4rem;
    font-weight: 800;
}

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

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

.feature-card {
    background: var(--bg-card);
    padding: 3rem 2rem;
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition-smooth);
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-10px);
    background: rgba(30, 41, 59, 0.9);
    border-color: var(--primary-color);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

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

/* Gallery Slider */
.gallery-section {
    padding: 8rem 0;
    background: rgba(15, 23, 42, 0.5);
}

.gallery-slider {
    margin-top: 2rem;
    padding: 2rem 0;
}

.gallery-track {
    display: flex;
    gap: 2rem;
    animation: scroll 30s linear infinite;
    width: max-content;
}

.gallery-track img {
    height: 500px;
    border-radius: 20px;
    box-shadow: var(--shadow-premium);
}

@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* Download Section */
.download-section {
    padding: 10rem 0;
    background: linear-gradient(to bottom, transparent, rgba(74, 144, 226, 0.1));
}

.download-section h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.download-section p {
    font-size: 1.25rem;
    color: var(--text-gray);
    margin-bottom: 3rem;
}

.download-btns {
    display: flex;
    justify-content: center;
    gap: 2rem;
}

/* Footer */
footer {
    padding: 4rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
}

.copyright {
    color: var(--text-gray);
    margin-bottom: 1.5rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
}

.footer-links a {
    color: var(--text-gray);
    text-decoration: none;
    transition: var(--transition-smooth);
}

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

/* Animations */
.fade-in {
    opacity: 0;
    animation: fadeIn 1s forwards;
}

.fade-in-right {
    opacity: 0;
    transform: translateX(50px);
    animation: fadeInRight 1s forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }

@keyframes fadeIn {
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInRight {
    to { opacity: 1; transform: translateX(0); }
}

.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

/* Mobile Responsive */
@media (max-width: 968px) {
    .nav-links { display: none; }
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-content h1 { font-size: 3rem; }
    .hero-content p { margin: 0 auto 2.5rem; }
    .hero-btns { justify-content: center; }
    .hero-mockup { max-width: 280px; }
}