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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #ffffff;
    background: linear-gradient(135deg, #071b12 0%, #0f2f22 50%, #143d2b 100%);
    overflow-x: hidden;
}

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

/* Mobile Container */
@media (max-width: 768px) {
    .container {
        max-width: 100%;
        padding: 0 15px;
    }
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.9), rgba(16, 185, 129, 0.9));
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1000;
    padding: 2rem 0;
}

/* Mobile Header Height */
@media (max-width: 768px) {
    .navbar {
        padding: 1rem 0;
    }
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Mobile Nav Container */
@media (max-width: 768px) {
    .nav-container {
        max-width: 100%;
        padding: 0 15px;
    }
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: #ffffff;
}

.logo-image {
    height: 40px;
    width: auto;
}

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

.nav-links a {
    color: #ffffff;
    text-decoration: none;
    font-weight: 500;
    font-size: 1.2rem;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: #ffffff;
}

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

/* Buttons */
.btn-primary, .btn-secondary {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.btn-primary {
    background: #22c55e;
    color: white;
}

.btn-primary:hover {
    background: #16a34a;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(34, 197, 94, 0.3);
}

.btn-primary.supporting {
    background: #4ade80 !important;
    border-color: #4ade80 !important;
    transform: scale(1.05);
    transition: all 0.3s ease;
    box-shadow: 0 8px 25px rgba(74, 222, 128, 0.3);
}

.btn-secondary {
    background: transparent;
    color: #b9bbbe;
    border: 1px solid rgba(185, 187, 190, 0.3);
}

.btn-secondary:hover {
    background: rgba(185, 187, 190, 0.1);
    color: #ffffff;
    border-color: rgba(185, 187, 190, 0.5);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1rem;
}

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: url('img/wall.jpeg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    position: relative;
    width: 100%;
    overflow-x: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    width: 100%;
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: #ffffff;
}

.gradient-text {
    color: #ffffff;
}

.hero-description {
    font-size: 1.4rem;
    color: #ffffff;
    margin-bottom: 2rem;
    line-height: 1.7;
}

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

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Image Transition Container */
.image-transition-container {
    position: relative;
    width: 400px;
    height: 500px;
    overflow: hidden;
    max-width: 100%;
}

.transition-image {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: auto;
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.95);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.transition-image.active {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

.transition-image img {
    width: 100%;
    height: auto;
    max-height: 100%;
    display: block;
    margin: 0 auto;
}




@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(1deg); }
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 20px rgba(88, 101, 242, 0.3); }
    50% { box-shadow: 0 0 40px rgba(88, 101, 242, 0.6), 0 0 60px rgba(235, 69, 158, 0.4); }
}

.card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.card-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #5865f2, #eb459e);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

.card-info h4 {
    color: #ffffff;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.card-info span {
    color: #b9bbbe;
    font-size: 0.9rem;
}

.card-content p {
    color: #b9bbbe;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

/* Section Styles */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #ffffff, #b9bbbe);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Mobile Section Header */
@media (max-width: 768px) {
    .section-header h2 {
        font-size: 2.5rem;
    }
    
    .mobile-break {
        display: block;
    }
}

/* Desktop: Hide mobile break */
.mobile-break {
    display: none;
}

.section-header p {
    font-size: 1.2rem;
    color: #b9bbbe;
    max-width: 600px;
    margin: 0 auto;
}

/* Why SyncTank Section */
.why-section {
    padding: 80px 0;
    background: rgba(255, 255, 255, 0.02);
}

.problems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.problem-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.problem-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(34, 197, 94, 0.3);
}

.problem-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #34d399, #10b981);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: white;
}

.problem-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #ffffff;
}

.problem-card p {
    color: #b9bbbe;
    line-height: 1.6;
}

.solution-highlight {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.1), rgba(16, 185, 129, 0.1));
    border: 1px solid rgba(34, 197, 94, 0.2);
    border-radius: 20px;
    padding: 3rem;
    text-align: center;
}

.solution-content h3 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #ffffff;
}

.solution-content p {
    font-size: 1.1rem;
    color: #b9bbbe;
    max-width: 600px;
    margin: 0 auto;
}

/* Support Counter Section */
.support-counter-section {
    padding: 4rem 0;
    background: url('img/wall.jpeg') no-repeat center center;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    position: relative;
    text-align: center;
    margin-top: -1px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 50vh;
}

.counter-content {
    max-width: 600px;
    margin: 0 auto;
    padding: 2rem;
}

.counter-icon {
    text-align: center;
    margin-bottom: 2rem;
}

.icon-image {
    width: 100px;
    height: 100px;
    object-fit: contain;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { 
        transform: translateY(0px); 
    }
    50% { 
        transform: translateY(-10px); 
    }
}

.counter-title {
    font-size: 3.2rem;
    font-weight: 700;
    font-family: 'Arial', sans-serif;
    color: white;
    margin-bottom: 2.5rem;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    line-height: 1.4;
    text-align: center;
    width: 100%;
}

.counter-title span {
    color: white;
    font-weight: 800;
    font-family: 'Arial', sans-serif;
    font-variant-numeric: tabular-nums;
}

.counter-description {
    font-size: 1.3rem;
    color: white;
    margin-bottom: 2rem;
    opacity: 0.85;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.5;
}

.counter-animation {
    font-size: 3rem;
    color: #22c55e;
    animation: heartbeat 2s ease-in-out infinite;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* Features Section */
.features-section {
    padding: 80px 0;
    background: url('img/wall.jpeg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    position: relative;
    margin-top: -1px; /* Remove gap between hero and features */
}

/* Why SyncTank Section - Same background as Features */
.why-section {
    padding: 80px 0;
    background: url('img/wall.jpeg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    position: relative;
    margin-top: -1px; /* Remove gap between features and why section */
}

/* Why Card Section */
.why-card-section {
    padding: 80px 0;
    background: url('img/wall.jpeg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    position: relative;
    margin-top: -1px;
}

.why-cards-grid {
    display: flex;
    flex-direction: column;
    gap: 8rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* AI Power Section */
.ai-power-section {
    padding: 80px 0;
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.2), rgba(16, 185, 129, 0.15), rgba(5, 150, 105, 0.2));
}

.upstage-image-container {
    text-align: center;
    margin-bottom: 3rem;
}

.upstage-image {
    max-width: 15% !important;
    width: 15% !important;
    height: auto !important;
}

/* Mobile Upstage Image */
@media (max-width: 768px) {
    .upstage-image {
        max-width: 30% !important;
        width: 30% !important;
    }
    
    /* Mobile Support Counter */
    .support-counter-section {
        padding: 2rem 0;
    }
    
    .counter-icon {
        margin-bottom: 1.5rem;
    }
    
    .icon-image {
        width: 70px;
        height: 70px;
    }
    
    .counter-title {
        font-size: 2.2rem;
        line-height: 1.3;
    }
    
    .counter-description {
        font-size: 1.1rem;
        max-width: 90%;
    }
    
    .counter-animation {
        font-size: 2.5rem;
    }
}

/* YouTube Video Section */
.youtube-section {
    padding: 4rem 0;
    background: url('img/wall.jpeg') no-repeat center center;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    position: relative;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
}

.video-container {
    width: 100%;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-container iframe {
    width: 100% !important;
    height: 500px !important;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    display: block;
    margin: 0 auto;
}

/* 강제 스타일 적용 */
.video-container iframe[width],
.video-container iframe[height] {
    width: 100% !important;
    height: 500px !important;
}

/* 극한 우선순위 */
.video-container iframe,
.video-container iframe[width],
.video-container iframe[height],
.video-container iframe[style] {
    width: 100% !important;
    height: 500px !important;
    max-width: 1000px !important;
    min-width: auto !important;
}

/* YouTube Video Section */
.youtube-video-section {
    padding: 0 0 4rem 0; /* Adjusted padding to move video higher */
    background: url('img/wall.jpeg') no-repeat center center;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    position: relative;
    text-align: center;
}

/* Comments Section */
.comments-section {
    padding: 4rem 0;
    background: url('img/wall.jpeg') no-repeat center center;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    position: relative;
    text-align: center;
}

.comments-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1;
}

.comments-section .container {
    position: relative;
    z-index: 2;
}

.comments-header {
    margin-bottom: 3rem;
    text-align: center;
}

.comments-header h3 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #22c55e 0%, #10b981 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.comments-header p {
    color: #e2e8f0;
    font-size: 1.2rem;
    margin: 0;
    line-height: 1.6;
}

#utterances-container {
    margin-top: 2rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Mobile Comments Section */
@media (max-width: 768px) {
    .comments-section {
        padding: 3rem 0;
    }
    
    .comments-header h3 {
        font-size: 2rem;
    }
    
    .comments-header p {
        font-size: 1rem;
        padding: 0 1rem;
    }
    
    #utterances-container {
        margin: 2rem 1rem 0 1rem;
    }
}

.youtube-video-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
}

.youtube-video-container iframe {
    width: 100%;
    height: 500px;
    border-radius: 20px;
    display: block;
    margin: 0 auto;
}

/* YouTube iframe 중앙 정렬 */
iframe[src*="youtube.com"] {
    display: block !important;
    margin: 0 auto !important;
    text-align: center !important;
}

/* Mobile YouTube Video */
@media (max-width: 768px) {
    .youtube-section {
        padding: 2rem 0;
        min-height: 40vh;
    }
    
    .video-container {
        padding: 1rem;
    }
    
    .video-container iframe {
        max-width: 100%;
        height: 250px;
        border-radius: 15px;
    }
}

.ai-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.ai-feature-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(34, 197, 94, 0.2);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.ai-feature-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(34, 197, 94, 0.4);
    box-shadow: 0 10px 30px rgba(34, 197, 94, 0.1);
}

.ai-feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #22c55e, #10b981);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: white;
}

.ai-feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #ffffff;
}

.ai-feature-card p {
    color: #b9bbbe;
    line-height: 1.6;
}

/* Feature Showcase */
.feature-showcase {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    max-width: 1200px;
    margin: 0 auto 4rem auto;
    align-items: center;
}

/* Features Grid */
.features-grid {
    display: flex;
    flex-direction: column;
    gap: 8rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: rgba(16, 185, 129, 0.15);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 80px;
    padding: 3rem;
    box-shadow: 0 20px 60px rgba(16, 185, 129, 0.1);
    transition: all 0.3s ease;
    min-height: 550px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: center;
    position: relative;
    overflow: hidden;
}

/* Mobile Card Layout */
@media (max-width: 768px) {
    .feature-card {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        padding: 1.5rem 1rem;
        min-height: auto;
    }
    
    .feature-card .card-left-panel {
        order: 1;
    }
    
    .feature-card .card-right-panel {
        order: 2;
    }
}

/* Card Left Panel */
.card-left-panel {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    align-items: center;
}

/* Chat Interface Mockup */
.chat-interface-mockup {
    width: 100%;
    height: 500px;
    background: linear-gradient(135deg, #34d399 0%, #10b981 100%);
    border-radius: 70px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.image-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: white;
}

.image-placeholder i {
    font-size: 3rem;
    opacity: 0.7;
}

.image-placeholder span {
    font-size: 1rem;
    opacity: 0.8;
}

.card-left-panel .feature-cards {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.card-left-panel .feature-number-card {
    background: white;
    border-radius: 16px;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.card-left-panel .feature-number {
    font-size: 1.2rem;
    font-weight: 700;
    color: #000;
}

.card-left-panel .feature-icon-small {
    font-size: 1.2rem;
    color: #3B82F6;
}

.card-left-panel .upload-button {
    background: #3B82F6;
    color: white;
    border: none;
    border-radius: 12px;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.card-left-panel .upload-button:hover {
    background: #2563EB;
    transform: translateY(-2px);
}

.card-left-panel .chat-mockup {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-left-panel .mockup-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: #6B7280;
}

.card-left-panel .mockup-placeholder i {
    font-size: 3rem;
    color: #D1D5DB;
}

.card-left-panel .mockup-placeholder span {
    font-size: 0.9rem;
    color: #9CA3AF;
}

/* Card Right Panel */
.card-right-panel {
    text-align: left;
    color: white;
    padding-left: 0;
    margin-left: 0;
}

.feature-card .card-right-panel h3 {
    font-size: 2.5rem !important;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: #ffffff !important;
}

.feature-card .card-right-panel .feature-description {
    font-size: 1.2rem !important;
    color: #b9bbbe !important;
    line-height: 1.6;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: float 6s ease-in-out infinite;
}

.feature-card:hover {
    transform: none;
    background: rgba(16, 185, 129, 0.15);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 20px 60px rgba(16, 185, 129, 0.1);
}

/* Left Panel */
.feature-left-panel {
    background: linear-gradient(135deg, #22c55e 0%, #10b981 100%);
    border-radius: 80px;
    padding: 3rem;
    position: relative;
    min-height: 600px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.feature-cards {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.feature-number-card {
    background: white;
    border-radius: 16px;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.feature-number {
    font-size: 1.2rem;
    font-weight: 700;
    color: #000;
}

.feature-icon-small {
    font-size: 1.2rem;
    color: #3B82F6;
}

.upload-button {
    background: #3B82F6;
    color: white;
    border: none;
    border-radius: 12px;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    align-self: center;
}

.upload-button:hover {
    background: #2563EB;
    transform: translateY(-2px);
}

.chat-mockup {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.mockup-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: #6B7280;
}

.mockup-placeholder i {
    font-size: 3rem;
    color: #D1D5DB;
}

.mockup-placeholder span {
    font-size: 0.9rem;
    color: #9CA3AF;
}

.feature-content h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: #ffffff;
}

.feature-subtitle {
    color: #ffffff;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.9;
}

.feature-description {
    color: #ffffff;
    line-height: 1.7;
    font-size: 1rem;
    opacity: 0.8;
}



.feature-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #ffffff;
}

.feature-subtitle {
    color: #22c55e;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.feature-description {
    color: #b9bbbe;
    line-height: 1.6;
    font-size: 0.95rem;
}

/* CTA Section */
.cta-section {
    padding: 80px 0;
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.12), rgba(16, 185, 129, 0.12));
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #ffffff;
}

.cta-content p {
    font-size: 1.2rem;
    color: #b9bbbe;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Footer */
.footer {
    background: rgba(0, 0, 0, 0.3);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    margin-bottom: 2rem;
}

.footer-brand p {
    color: #b9bbbe;
    margin-top: 1rem;
}

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

.footer-column h4 {
    color: #ffffff;
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-column a {
    color: #b9bbbe;
    text-decoration: none;
    display: block;
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
}

.footer-column a:hover {
    color: #ffffff;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
    color: #b9bbbe;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .nav-container {
        justify-content: center;
    }
    
    .logo-image {
        height: 32px;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
        max-width: 100%;
        padding: 0 15px;
        width: 100%;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .hero-visual img,
    .hero-visual video {
        width: 80% !important;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-description {
        font-size: 1.1rem;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .image-transition-container {
        width: 300px;
        height: 380px;
        max-width: 90%;
    }
    
    .cta-content h2 {
        font-size: 2rem;
    }
    
    .problems-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        gap: 1.5rem;
        margin: 0 0.25rem;
    }
    
    .feature-card {
        border-radius: 30px;
    }
    
    .chat-interface-mockup {
        height: 250px;
        border-radius: 30px;
    }
    
    .chat-interface-mockup video {
        border-radius: 30px !important;
    }
    
    .feature-card .card-right-panel h3 {
        font-size: 1.5rem !important;
    }
    
    .feature-card .card-right-panel .feature-description {
        font-size: 1rem !important;
    }
    
    .feature-card {
        padding: 2rem;
        gap: 1.5rem;
    }
    
    .feature-card {
        padding: 2rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    /* YouTube Video 모바일 최적화 */
    .youtube-video-section {
        padding: 2rem 0;
    }
    
    .youtube-video-container {
        max-width: 95%;
        padding: 1rem;
        border-radius: 20px;
    }
    
    .youtube-video-container iframe {
        height: 250px;
        border-radius: 15px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .btn-large {
        padding: 0.875rem 1.5rem;
        font-size: 0.9rem;
    }
}