/* ==================== 
   Reset & Base Styles 
   ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Primary Colors */
    --primary-color: #4CAF50;
    --primary-dark: #388E3C;
    --primary-light: #81C784;
    
    /* Secondary Colors */
    --secondary-color: #FF9800;
    --secondary-dark: #F57C00;
    --secondary-light: #FFB74D;
    
    /* Neutral Colors */
    --dark: #1a1a1a;
    --gray-900: #212121;
    --gray-800: #424242;
    --gray-700: #616161;
    --gray-600: #757575;
    --gray-500: #9E9E9E;
    --gray-400: #BDBDBD;
    --gray-300: #E0E0E0;
    --gray-200: #EEEEEE;
    --gray-100: #F5F5F5;
    --white: #FFFFFF;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #4CAF50 0%, #81C784 100%);
    --gradient-secondary: linear-gradient(135deg, #FF9800 0%, #FFB74D 100%);
    --gradient-dark: linear-gradient(135deg, #1a1a1a 0%, #424242 100%);
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--gray-900);
    background-color: var(--white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

img {
    max-width: 100%;
    height: auto;
}

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

ul {
    list-style: none;
}

/* ==================== 
   Typography 
   ==================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }

/* ==================== 
   Buttons 
   ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: center;
    white-space: nowrap;
}

.btn i {
    font-size: 1.2rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: transparent;
    color: var(--gray-900);
    border: 2px solid var(--gray-300);
}

.btn-secondary:hover {
    background-color: var(--gray-100);
    border-color: var(--gray-400);
}

.btn-large {
    padding: 1.25rem 2.5rem;
    font-size: 1.125rem;
}

/* ==================== 
   Navigation 
   ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    padding-bottom: 1rem;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
}

.nav-brand-icon {
    width: 1.75rem;
    height: 1.75rem;
    border-radius: var(--radius-sm);
    object-fit: cover;
    display: block;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.language-switcher {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.45rem 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-full);
    background-color: var(--white);
}

.language-switcher i {
    color: var(--gray-600);
    font-size: 0.95rem;
}

.language-switcher select {
    border: none;
    background: transparent;
    color: var(--gray-700);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    outline: none;
    padding-right: 0.25rem;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

.nav-menu a {
    font-weight: 500;
    color: var(--gray-700);
    transition: color var(--transition-fast);
    padding: 0.5rem 1rem;
}

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

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-700);
    cursor: pointer;
}

/* ==================== 
   Hero Section 
   ==================== */
.hero {
    position: relative;
    padding: calc(80px + var(--spacing-xl)) 0 var(--spacing-xl);
    overflow: hidden;
    background: linear-gradient(135deg, #f8fffe 0%, #f0f9ff 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.hero-text {
    z-index: 2;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    background: rgba(76, 175, 80, 0.1);
    color: var(--primary-color);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.hero-title {
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s ease;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: 2rem;
    line-height: 1.8;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-buttons {
    display: flex;
    flex-wrap: nowrap;
    gap: 1rem;
    margin-bottom: 3rem;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-buttons .btn {
    flex: 1 1 0;
    min-width: 0;
    width: auto;
    justify-content: center;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-md);
    animation: fadeInUp 0.8s ease 0.6s both;
}

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

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-600);
}

.hero-image {
    position: relative;
    z-index: 2;
    animation: fadeIn 1s ease 0.4s both;
}

.phone-mockup {
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-frame {
    width: 280px;
    height: 560px;
    background: var(--gradient-dark);
    border-radius: 30px;
    padding: 0;
    box-shadow: var(--shadow-xl);
    position: relative;
    animation: float 3s ease-in-out infinite;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #4CAF50 0%, #81C784 100%);
    border-radius: 30px;
    overflow: hidden;
}

.phone-screen img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    border-radius: inherit;
    display: block;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
    overflow: hidden;
}

.bg-circle {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(76, 175, 80, 0.15) 0%, transparent 70%);
}

.circle-1 {
    width: 500px;
    height: 500px;
    top: -200px;
    right: -100px;
    animation: float 8s ease-in-out infinite;
}

.circle-2 {
    width: 300px;
    height: 300px;
    bottom: -100px;
    left: -50px;
    animation: float 6s ease-in-out infinite 1s;
}

.circle-3 {
    width: 200px;
    height: 200px;
    top: 50%;
    left: 10%;
    animation: float 7s ease-in-out infinite 2s;
}

/* ==================== 
   Section Styles 
   ==================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-badge {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    background: rgba(76, 175, 80, 0.1);
    color: var(--primary-color);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.section-title {
    margin-bottom: 1rem;
}

.section-description {
    font-size: 1.125rem;
    color: var(--gray-600);
    max-width: 700px;
    margin: 0 auto;
}

/* ==================== 
   Features Section 
   ==================== */
.features {
    padding: var(--spacing-xl) 0;
    background-color: var(--white);
}

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

.feature-card {
    padding: var(--spacing-md);
    background-color: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    opacity: 0;
    transform: translateY(30px);
}

.feature-card.aos-animate {
    opacity: 1;
    transform: translateY(0);
}

.feature-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    transition: all var(--transition-normal);
}

.feature-icon i {
    font-size: 2rem;
    color: var(--white);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

.feature-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--gray-900);
}

.feature-status {
    display: inline-block;
    margin-bottom: 0.75rem;
    padding: 0.2rem 0.6rem;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--secondary-dark);
    background-color: var(--secondary-light);
    border-radius: var(--radius-full);
}

.feature-description {
    color: var(--gray-600);
    line-height: 1.7;
}

/* ==================== 
   Benefits Section 
   ==================== */
.benefits {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, #f8fffe 0%, #ffffff 100%);
}

.benefits-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.benefits-image {
    position: relative;
}

.benefits-mockup {
    position: relative;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mockup-card {
    background: var(--white);
    padding: 2rem 3rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: 1rem;
    animation: float 3s ease-in-out infinite;
}

.mockup-card i {
    font-size: 3rem;
    color: var(--primary-color);
}

.mockup-card span {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
}

.benefits-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.benefits-text .section-title + .benefits-list {
    margin-top: 3rem;
}

.benefit-item {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.benefit-icon {
    width: 50px;
    height: 50px;
    background: rgba(76, 175, 80, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.benefit-icon i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.benefit-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--gray-900);
}

.benefit-content p {
    color: var(--gray-600);
    line-height: 1.7;
}

/* ==================== 
   Screenshots Section 
   ==================== */
.screenshots {
    padding: var(--spacing-xl) 0;
    background-color: var(--white);
}

.screenshots-carousel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.screenshot-item {
    opacity: 0;
    transform: scale(0.9);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.screenshot-item.aos-animate {
    opacity: 1;
    transform: scale(1);
}

.screenshot-image {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.screenshot-image:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.screenshot-item h4 {
    font-size: 1.25rem;
    color: var(--gray-700);
    text-align: center;
}

/* ==================== 
   Testimonials Section 
   ==================== */
.testimonials {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, #f8fffe 0%, #ffffff 100%);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.testimonial-card {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    opacity: 0;
    transform: translateY(30px);
}

.testimonial-card.aos-animate {
    opacity: 1;
    transform: translateY(0);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.testimonial-rating {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 1rem;
}

.testimonial-rating i {
    color: #FFC107;
    font-size: 1.125rem;
}

.testimonial-text {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--gray-700);
    margin-bottom: 1.5rem;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.author-avatar {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.author-avatar i {
    font-size: 1.5rem;
    color: var(--white);
}

.author-info h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.author-info p {
    font-size: 0.875rem;
    color: var(--gray-600);
}

/* ==================== 
   CTA Section 
   ==================== */
.cta {
    padding: var(--spacing-xl) 0;
    background: var(--gradient-primary);
    color: var(--white);
    text-align: center;
}

.cta-content {
    opacity: 0;
    transform: scale(0.95);
}

.cta-content.aos-animate {
    opacity: 1;
    transform: scale(1);
}

.cta-title {
    color: var(--white);
    margin-bottom: 1rem;
}

.cta-description {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.cta .btn-large {
    background-color: var(--white);
    color: var(--primary-color);
    font-weight: 700;
}

.cta-store-buttons {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.cta-store-buttons .btn-large {
    width: min(100%, 360px);
    justify-content: center;
}

.cta .btn-large:hover {
    background-color: var(--gray-100);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.cta-note {
    margin-top: 1.5rem;
    font-size: 0.875rem;
    opacity: 0.9;
}

.cta-note i {
    margin-right: 0.5rem;
}

/* ==================== 
   Footer 
   ==================== */
.footer {
    background-color: var(--gray-900);
    color: var(--gray-300);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 1rem;
}

.footer-logo i {
    font-size: 1.75rem;
    color: var(--primary-color);
}

.footer-description {
    color: var(--gray-400);
    line-height: 1.7;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

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

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

.footer-column a {
    color: var(--gray-400);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--gray-700);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    background-color: var(--gray-800);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-300);
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
}

/* ==================== 
   Animations 
   ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* ==================== 
   Responsive Design 
   ==================== */
@media (max-width: 992px) {
    .hero-content,
    .benefits-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .hero-image {
        order: -1;
    }
    
    .phone-frame {
        width: 240px;
        height: 480px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    html,
    body {
        width: 100%;
        overflow-x: hidden;
    }

    .container {
        width: 100%;
        max-width: 100%;
        padding-left: 16px;
        padding-right: 16px;
    }

    .nav-menu {
        display: none;
    }

    .nav-brand {
        font-size: 1.25rem;
    }

    .nav-actions {
        margin-left: auto;
    }

    .language-switcher {
        padding: 0.35rem 0.6rem;
    }

    .language-switcher select {
        font-size: 0.85rem;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero {
        padding: calc(80px + var(--spacing-md)) 0 var(--spacing-md);
    }
    
    .hero-buttons {
        flex-direction: column;
    }

    .hero-buttons .btn {
        min-height: 60px;
        padding-top: 1.1rem;
        padding-bottom: 1.1rem;
    }
    
    .hero-stats {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .features-grid,
    .screenshots-carousel,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .benefits-mockup {
        height: 300px;
    }
    
    .mockup-card {
        padding: 1.5rem 2rem;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .section-header,
    .cta-content {
        padding-left: 0;
        padding-right: 0;
    }

    .btn {
        white-space: normal;
    }

    .cta-store-buttons .btn-large {
        padding: 1rem 1.75rem;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding-left: 16px;
        padding-right: 16px;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }

    .cta-store-buttons .btn-large {
        padding: 0.875rem 1.25rem;
        font-size: 0.95rem;
    }
    
    .phone-frame {
        width: 200px;
        height: 400px;
    }
    
    .phone-screen i {
        font-size: 3rem;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
}