/* ============================================
   (주)이루스 AI DDS - 스마트 약배송 시스템
   ============================================ */

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

:root {
    /* Brand Colors - Based on RGB(0, 200, 255) #00C8FF */
    --primary-color: #00C8FF;
    --primary-light: #33D4FF;
    --primary-dark: #0096CC;
    --primary-gradient-start: #00C8FF;
    --primary-gradient-end: #0096FF;
    
    /* Secondary Colors */
    --secondary-cyan: #00E5FF;
    --secondary-blue: #0088FF;
    --accent-purple: #6B4FFF;
    --accent-green: #00D4AA;
    
    /* Neutral Colors */
    --dark: #0A1628;
    --dark-blue: #1A2332;
    --dark-card: #1E2A3A;
    --white: #FFFFFF;
    --light-gray: #F0F4F8;
    --text-gray: #64748B;
    --text-light: #94A3B8;
    
    /* Shadows & Glows */
    --shadow: 0 4px 20px rgba(0, 200, 255, 0.15);
    --shadow-lg: 0 20px 60px rgba(0, 200, 255, 0.25);
    --shadow-xl: 0 30px 80px rgba(0, 200, 255, 0.3);
    --neon-glow: 0 0 20px rgba(0, 200, 255, 0.6);
    --neon-glow-strong: 0 0 30px rgba(0, 200, 255, 0.8);
}

html {
    scroll-behavior: smooth;
}

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

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

.section {
    padding: 200px 0;
    position: relative;
}

.section::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.1), transparent);
}

.section-dark {
    background: var(--dark-blue);
    color: var(--white);
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    z-index: 1000;
    transition: all 0.3s ease;
    padding: 0;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 1);
    box-shadow: 0 4px 20px rgba(0,0,0,0.12);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    max-width: 1400px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.nav-brand:hover {
    opacity: 0.8;
}

.nav-logo {
    height: 32px;
    width: 130px;
    display: block;
    object-fit: contain;
    background: transparent;
}

.brand-service {
    background: #00C8FF;
    color: var(--white);
    width: 75px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.5px;
    padding: 0;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
    margin: 0;
    padding: 0;
}

.nav-menu li {
    margin: 0;
}

.nav-menu a {
    color: var(--dark);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    padding: 6px 0;
    position: relative;
    transition: all 0.3s ease;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

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

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 22px;
    color: var(--dark);
    cursor: pointer;
    padding: 5px;
}
    color: var(--dark);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 0;
    position: relative;
    transition: all 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-cyan));
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--dark);
    cursor: pointer;
}

/* ===== Section Headers ===== */
.section-header {
    text-align: center;
    margin-bottom: 100px;
}

.section-title {
    font-size: 72px;
    font-weight: 900;
    color: var(--dark);
    margin-bottom: 30px;
    letter-spacing: -3px;
    line-height: 1;
    background: linear-gradient(135deg, var(--dark) 0%, var(--primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title::after {
    content: '';
    display: block;
    width: 100px;
    height: 5px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-cyan));
    margin: 30px auto 0;
    border-radius: 3px;
}

.section-subtitle {
    font-size: 24px;
    color: var(--text-gray);
    line-height: 1.8;
    max-width: 900px;
    margin: 0 auto;
    font-weight: 300;
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    height: 100vh;
    max-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 0;
}

/* ===== Hero Video Background ===== */
.hero-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
    /* 색감 최적화 - 골든아워 석양 톤 (참고 이미지 기반) */
    filter: brightness(1.1) contrast(1.2) saturate(1.1) hue-rotate(10deg);
    opacity: 1.0;
    /* 이미지 렌더링 최적화 */
    image-rendering: -webkit-optimize-contrast;
}

/* 비디오 로딩 실패시 파티클 표시 */
.hero-video:error + .hero-particles {
    display: block;
}

/* ===== Particle Canvas (Fallback) ===== */
.hero-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: auto;
    display: none;
}

/* 비디오 지원 여부 확인 */
.no-video .hero-video {
    display: none;
}

.no-video .hero-particles {
    display: block;
    z-index: 0;
}

/* ===== Hero Background Video ===== */
.hero-bg-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    z-index: 0;
    /* 비디오 색감 최적화 - 골든아워 석양 톤 (참고 이미지 기반) */
    filter: brightness(1.1) contrast(1.2) saturate(1.1) hue-rotate(10deg);
    opacity: 1.0;
    /* 부드러운 전환 효과 */
    transition: opacity 0.5s ease-in-out, filter 0.5s ease-in-out;
}

/* 비디오 줌 애니메이션 제거 - 전체 화면 최적화 */

/* ===== Hero Background Image - Fallback ===== */
.hero-bg-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    z-index: 0;
    /* 이미지 선명도 최적화 */
    filter: brightness(1.15) contrast(1.35) saturate(1.3);
    opacity: 1.0;
    animation: droneFlyEffect 20s ease-in-out infinite;
    /* 이미지 렌더링 최적화 */
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

@keyframes droneFlyEffect {
    0%, 100% {
        transform: scale(1.05) translateX(0);
    }
    50% {
        transform: scale(1.1) translateX(-2%);
    }
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* 골든아워 석양 톤 오버레이 + 텍스트 가독성 */
    background: linear-gradient(
        135deg,
        rgba(60, 40, 20, 0.2) 0%,
        rgba(120, 80, 40, 0.1) 50%,
        rgba(180, 140, 80, 0.15) 100%
    );
    z-index: 1;
    
    /* 시안 홀로그램 효과 */
    animation: hologramGlow 8s ease-in-out infinite;
}

@keyframes hologramGlow {
    0%, 100% {
        box-shadow: inset 0 0 40px rgba(0, 200, 255, 0.12);
    }
    50% {
        box-shadow: inset 0 0 60px rgba(0, 230, 255, 0.18);
    }
}

/* ===== Floating Icons Animation ===== */
.floating-icons {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    pointer-events: none;
}

.float-icon {
    position: absolute;
    left: var(--x);
    top: var(--y);
    font-size: 30px;
    /* 투명도 대폭 낮춤 - 뿌옇게 보이는 문제 해결 */
    color: rgba(255, 255, 255, 0.05);
    animation: floatUpDown 6s ease-in-out infinite;
    animation-delay: var(--delay);
    filter: blur(0.5px);
}

.float-icon i {
    animation: rotate3d 8s linear infinite;
    animation-delay: var(--delay);
    display: block;
}

@keyframes floatUpDown {
    0%, 100% {
        transform: translateY(0) translateX(0) scale(1);
        opacity: 0.15;
    }
    25% {
        transform: translateY(-30px) translateX(10px) scale(1.1);
        opacity: 0.25;
    }
    50% {
        transform: translateY(-50px) translateX(-10px) scale(1.15);
        opacity: 0.3;
    }
    75% {
        transform: translateY(-30px) translateX(10px) scale(1.1);
        opacity: 0.25;
    }
}

@keyframes rotate3d {
    0% {
        transform: rotateY(0deg) rotateX(0deg);
    }
    25% {
        transform: rotateY(90deg) rotateX(20deg);
    }
    50% {
        transform: rotateY(180deg) rotateX(0deg);
    }
    75% {
        transform: rotateY(270deg) rotateX(-20deg);
    }
    100% {
        transform: rotateY(360deg) rotateX(0deg);
    }
}

/* ===== Data Flow Lines ===== */
.data-lines {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    pointer-events: none;
    overflow: hidden;
}

.data-line {
    position: absolute;
    width: 2px;
    height: 0;
    /* 투명도 대폭 낮춤 */
    background: linear-gradient(
        to bottom,
        rgba(0, 200, 255, 0),
        rgba(0, 200, 255, 0.2),
        rgba(0, 200, 255, 0)
    );
    left: var(--start-x);
    top: var(--start-y);
    animation: dataFlow 4s ease-in-out infinite;
    animation-delay: var(--delay);
    transform-origin: top;
}

@keyframes dataFlow {
    0% {
        height: 0;
        opacity: 0;
        transform: rotate(calc((var(--end-x) - var(--start-x)) * 0.5deg));
    }
    20% {
        opacity: 0.8;
    }
    50% {
        height: 200px;
        opacity: 1;
    }
    80% {
        opacity: 0.8;
    }
    100% {
        height: 0;
        opacity: 0;
        transform: translateY(calc(var(--end-y) - var(--start-y))) 
                   translateX(calc(var(--end-x) - var(--start-x)));
    }
}


.hero .container {
    position: relative;
    z-index: 3;
    max-width: 1400px;
    perspective: 1000px;
}

.hero-content {
    text-align: center;
    color: var(--white);
    padding: 120px 20px 80px 20px;
    max-width: 1200px;
    margin: 0 auto;
    transform-style: preserve-3d;
    animation: subtle3d 20s ease-in-out infinite;
}

@keyframes subtle3d {
    0%, 100% {
        transform: translateZ(0) rotateX(0deg);
    }
    50% {
        transform: translateZ(20px) rotateX(1deg);
    }
}

.hero-badge {
    display: inline-block;
    padding: 18px 50px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 100px;
    font-size: 17px;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 50px;
    border: 2px solid rgba(255, 255, 255, 0.8);
    letter-spacing: 1px;
    animation: fadeInDown 1s ease;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3), 0 4px 15px rgba(0, 0, 0, 0.5);
}

.hero-badge i {
    color: var(--primary-color);
    margin-right: 8px;
    font-size: 18px;
    animation: rocketFloat 2s ease-in-out infinite;
}

@keyframes rocketFloat {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-5px) rotate(-5deg);
    }
}

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

.hero-title {
    margin-bottom: 30px;
    animation: fadeInUp 1s ease 0.3s backwards;
}

.hero-title-line {
    display: block;
    font-size: 42px;
    font-weight: 300;
    line-height: 1.2;
    color: rgba(255, 255, 255, 1);
    letter-spacing: -1px;
    margin-bottom: 10px;
    /* 강력한 그림자 추가 - 가독성 극대화 */
    text-shadow: 
        0 6px 30px rgba(0, 0, 0, 1),
        0 3px 15px rgba(0, 0, 0, 1),
        0 0 50px rgba(0, 0, 0, 0.8);
}

.hero-title-emphasis {
    display: block;
    font-size: 72px;
    font-weight: 900;
    line-height: 0.95;
    color: var(--white);
    letter-spacing: -5px;
    text-shadow: 
        0 0 30px rgba(0, 200, 255, 1),
        0 0 60px rgba(0, 230, 255, 0.8),
        0 6px 30px rgba(0, 0, 0, 1),
        0 3px 15px rgba(0, 0, 0, 1),
        0 0 50px rgba(0, 0, 0, 0.8);
    margin-top: 10px;
    animation: neonPulse 3s ease-in-out infinite;
}

@keyframes neonPulse {
    0%, 100% {
        text-shadow: 
            0 0 20px rgba(0, 200, 255, 0.9),
            0 0 40px rgba(0, 230, 255, 0.7),
            0 4px 20px rgba(0, 0, 0, 0.9);
    }
    50% {
        text-shadow: 
            0 0 30px rgba(0, 200, 255, 1),
            0 0 60px rgba(0, 230, 255, 0.9),
            0 4px 20px rgba(0, 0, 0, 0.9);
    }
}

.hero-subtitle {
    font-size: 20px;
    line-height: 1.6;
    margin-bottom: 40px;
    opacity: 1;
    color: rgba(255, 255, 255, 1);
    animation: fadeInUp 1s ease 0.5s backwards;
    /* 강력한 그림자 추가 */
    text-shadow: 
        0 5px 30px rgba(0, 0, 0, 1),
        0 2px 10px rgba(0, 0, 0, 1),
        0 0 40px rgba(0, 0, 0, 0.9);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 300;
}

.hero-subtitle strong {
    font-weight: 700;
    color: var(--white);
    text-decoration: underline;
    text-decoration-color: rgba(255, 255, 255, 0.5);
    text-underline-offset: 4px;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 80px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 40px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 16px;
    text-decoration: none;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, rgba(0, 200, 255, 0.95), rgba(0, 150, 255, 0.95));
    color: var(--white);
    border: 2px solid rgba(0, 200, 255, 0.6);
    box-shadow: 0 0 25px rgba(0, 200, 255, 0.6);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        45deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    transform: rotate(45deg);
    animation: btnShine 3s infinite;
}

@keyframes btnShine {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

.btn-primary:hover {
    transform: translateY(-5px) translateZ(10px) scale(1.05);
    box-shadow: 
        0 0 35px rgba(0, 200, 255, 0.9),
        0 0 70px rgba(0, 230, 255, 0.7),
        0 15px 50px rgba(0, 200, 255, 0.5);
    border-color: rgba(0, 230, 255, 0.9);
}

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

.btn-secondary:hover {
    background: var(--white);
    color: var(--primary-color);
    transform: translateY(-5px) translateZ(10px) scale(1.05);
    box-shadow: 0 15px 40px rgba(255, 255, 255, 0.4);
}

/* ===== App Download Section ===== */
.app-download-section {
    margin: 30px 0 40px;
    text-align: center;
}

.app-download-title {
    color: var(--white);
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    opacity: 0.95;
}

.app-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.app-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    min-width: 180px;
}

.app-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    background: rgba(255, 255, 255, 1);
}

.app-btn i {
    font-size: 32px;
}

.app-btn-web i {
    color: #1C63EE;
}

.app-btn-ios i {
    color: #000000;
}

.app-btn-android i {
    color: #3DDC84;
}

.app-btn-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
}

.app-btn-label {
    font-size: 16px;
    font-weight: 700;
    color: var(--dark);
    line-height: 1.2;
}

.app-btn-desc {
    font-size: 12px;
    color: var(--text-gray);
    line-height: 1.2;
}

/* ===== Hero Statistics ===== */
.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    max-width: 800px;
    margin: 30px auto 0 auto;
}

.stat-item {
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(15px);
    padding: 25px 15px;
    border-radius: 15px;
    text-align: center;
    border: 2px solid rgba(255, 255, 255, 0.4);
    transition: all 0.3s ease;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
    overflow: visible;
    min-height: 120px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.stat-item:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.35);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.stat-number {
    font-size: 32px;
    font-weight: 900;
    color: var(--white);
    margin-bottom: 8px;
    text-shadow: 0 3px 15px rgba(0, 0, 0, 0.8), 0 1px 5px rgba(0, 0, 0, 1);
    white-space: nowrap;
    overflow: visible;
    line-height: 1.2;
}

.stat-number .unit {
    font-size: 12px;
    font-weight: 600;
    margin-left: 4px;
    opacity: 0.9;
}

.stat-label {
    font-size: 14px;
    color: var(--white);
    opacity: 1;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.8);
}
    gap: 30px;
    margin-top: 80px;
}

.stat-card {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.2);
}

.stat-number {
    font-size: 56px;
    font-weight: 900;
    color: var(--white);
    margin-bottom: 10px;
}

.stat-label {
    font-size: 14px;
    color: var(--white);
    opacity: 1;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.8);
}

/* ===== Section Headers ===== */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 20px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-cyan));
    border-radius: 2px;
}

.section-dark .section-title {
    color: var(--white);
}

.section-description {
    font-size: 18px;
    color: var(--text-gray);
    line-height: 1.8;
}

.section-dark .section-description {
    color: rgba(255, 255, 255, 0.8);
}

/* ===== About Section ===== */
.about {
    padding: 180px 0;
    min-height: 100vh;
    background: var(--white);
    position: relative;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background-image: url('https://images.unsplash.com/photo-1576091160399-112ba8d25d1d?w=1920&q=80');
    background-size: cover;
    background-position: center;
    opacity: 0.08;
    z-index: 0;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.about-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s ease;
}

.about-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.about-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 36px;
    color: var(--white);
}

.about-icon.blue {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
}

.about-icon.green {
    background: linear-gradient(135deg, var(--accent-green), var(--secondary-cyan));
}

.about-card h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--dark);
}

.about-card p {
    color: var(--text-gray);
    line-height: 1.8;
}

/* ===== Features Section ===== */
.features {
    padding: 180px 0;
    min-height: 100vh;
    background: linear-gradient(to bottom, #f8f9fa 0%, #ffffff 100%);
    position: relative;
}

.features::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 60%;
    background-image: url('https://images.unsplash.com/photo-1559827260-dc66d52bef19?w=1920&q=80');
    background-size: cover;
    background-position: center top;
    opacity: 0.05;
    z-index: 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.feature-card {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.95) 0%, rgba(241, 245, 249, 0.9) 100%);
    padding: 60px 40px;
    border-radius: 30px;
    box-shadow: 0 10px 40px rgba(0, 200, 255, 0.15);
    text-align: center;
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 1px solid rgba(0, 200, 255, 0.2);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-cyan), var(--secondary-blue));
    transform: scaleX(0);
    transition: transform 0.4s ease;
    box-shadow: 0 0 20px rgba(0, 200, 255, 0.7);
}

.feature-card:hover {
    transform: translateY(-15px) scale(1.03);
    box-shadow: 
        0 0 40px rgba(0, 200, 255, 0.45),
        0 30px 80px rgba(0, 230, 255, 0.35);
    border-color: var(--primary-color);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.98) 0%, rgba(230, 250, 255, 0.95) 100%);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 25px;
    font-size: 45px;
    color: var(--white);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-cyan) 100%);
    box-shadow: 0 15px 40px rgba(0, 200, 255, 0.35);
    transition: all 0.4s ease;
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 15px 40px rgba(0, 200, 255, 0.5);
}

.feature-card h3 {
    font-size: 26px;
    font-weight: 800;
    margin-bottom: 20px;
    color: var(--dark);
    letter-spacing: -0.5px;
}

.feature-card p {
    color: var(--text-gray);
    line-height: 1.8;
    font-size: 16px;
}

/* ===== How It Works Section ===== */
.how-it-works {
    padding: 120px 0;
    min-height: 100vh;
    background: var(--white);
}

.steps {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 60px;
    flex-wrap: wrap;
    gap: 30px;
}

.step {
    flex: 1;
    min-width: 200px;
    text-align: center;
    position: relative;
}

.step-number {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-cyan));
    color: var(--white);
    font-size: 28px;
    font-weight: 900;
    border-radius: 50%;
    box-shadow: var(--shadow);
}

.step-icon {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.step-connector {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-cyan));
    position: relative;
    flex-shrink: 0;
}

.step h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--dark);
}

.step p {
    color: var(--text-gray);
    line-height: 1.8;
    font-size: 14px;
}

/* ===== Benefits Section ===== */
.benefits {
    padding: 120px 0;
    min-height: 100vh;
    background: var(--light-gray);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.benefit-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s ease;
}

.benefit-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.benefit-card i {
    font-size: 48px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
}

.benefit-card h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--dark);
}

.benefit-card p {
    color: var(--text-gray);
    line-height: 1.8;
    font-size: 15px;
}

/* ===== Technology Section ===== */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.tech-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    padding: 40px 30px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.tech-card:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-5px);
}

.tech-icon {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--green-mid), var(--green-end));
    border-radius: 15px;
    font-size: 32px;
    color: var(--white);
    margin-bottom: 25px;
}

.tech-card h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--white);
}

.tech-card p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
}

/* ===== Contact Section ===== */
.contact {
    padding: 120px 0;
    min-height: 100vh;
    background: var(--white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 50px;
    align-items: start;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 50px;
    align-items: start;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.contact-item {
    background: var(--white);
    padding: 25px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: flex-start;
    gap: 20px;
    transition: all 0.3s ease;
}

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

.contact-card {
    background: var(--white);
    padding: 30px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s ease;
}

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

.contact-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-cyan));
    border-radius: 12px;
    font-size: 24px;
    color: var(--white);
    flex-shrink: 0;
}

.contact-details h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--dark);
}

.contact-details p {
    color: var(--text-gray);
    line-height: 1.7;
    font-size: 14px;
}

.contact-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--dark);
}

.contact-card p {
    color: var(--text-gray);
    line-height: 1.7;
    font-size: 14px;
}

/* ===== Contact Form ===== */
.contact-form {
    background: var(--white);
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
}

.contact-form h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--dark);
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 16px;
    font-family: 'Noto Sans KR', sans-serif;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 200, 255, 0.15);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* ===== CTA Download Section ===== */
.cta-download {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-cyan) 100%);
    padding: 100px 0;
    text-align: center;
}

.cta-content {
    max-width: 900px;
    margin: 0 auto;
}

.cta-title {
    font-size: 42px;
    font-weight: 900;
    color: var(--white);
    margin-bottom: 20px;
    line-height: 1.3;
}

.cta-subtitle {
    font-size: 18px;
    color: var(--white);
    opacity: 0.95;
    margin-bottom: 50px;
    line-height: 1.6;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.cta-btn {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 18px 35px;
    background: var(--white);
    border-radius: 15px;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 6px 25px rgba(0, 0, 0, 0.15);
    min-width: 220px;
}

.cta-btn:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

.cta-btn i {
    font-size: 45px;
}

.cta-btn-web i {
    color: #1C63EE;
}

.cta-btn-ios i {
    color: #000000;
}

.cta-btn-android i {
    color: #3DDC84;
}

.cta-btn-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
}

.cta-btn-label {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark);
    line-height: 1.2;
}

.cta-btn-desc {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.2;
    margin-top: 2px;
}

/* ===== Footer ===== */
.footer {
    background: var(--dark);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.footer-logo-img {
    height: 32px;
    width: auto;
    display: block;
    object-fit: contain;
}

.footer-brand-service {
    background: #00C8FF;
    color: var(--white);
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.footer-brand > p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    margin-bottom: 20px;
}

.footer-links h4 {
    font-size: 18px;
    margin-bottom: 15px;
    color: var(--white);
    font-weight: 600;
}

.footer-section h3 {
    font-size: 24px;
    margin-bottom: 20px;
}

.footer-section h4 {
    font-size: 18px;
    margin-bottom: 15px;
    color: var(--white);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 20px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--white);
    font-size: 18px;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-cyan));
    transform: translateY(-3px);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer-section ul li a:hover {
    color: var(--white);
    padding-left: 5px;
}

.footer-section ul.contact-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: rgba(255, 255, 255, 0.7);
}

.footer-section ul.contact-list li i {
    color: var(--primary-color);
    font-size: 16px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 5px;
}

.footer-domain {
    color: var(--primary-color);
    font-weight: 600;
}

/* ===== About Section ===== */
.about {
    padding: 100px 0;
    background: var(--white);
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 60px;
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 20px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-gray);
    line-height: 1.8;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-image {
    position: relative;
    width: 100%;
    overflow: hidden;
    border-radius: 35px;
    box-shadow: 0 40px 100px rgba(91, 155, 213, 0.15);
}

.about-full-image {
    width: 100%;
    height: 700px;
    object-fit: cover;
    object-position: center;
    border-radius: 35px;
    transition: transform 0.8s ease, filter 0.5s ease;
    /* 메인 비디오와 동일한 시네마틱 필터 */
    filter: brightness(1.1) contrast(1.2) saturate(1.15);
    animation: subtleFloat 25s ease-in-out infinite;
    /* 시네마틱 글로우 효과 - 메인 비디오 매칭 */
    box-shadow: 
        0 20px 60px rgba(0, 200, 255, 0.25),
        0 0 40px rgba(0, 230, 255, 0.15);
    /* 이미지 렌더링 최적화 */
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

@keyframes subtleFloat {
    0%, 100% {
        transform: scale(1) translateY(0);
    }
    50% {
        transform: scale(1.05) translateY(-2%);
    }
}

.about-image:hover .about-full-image {
    transform: scale(1.1);
    animation-play-state: paused;
}

.image-placeholder {
    width: 100%;
    height: 600px;
    background-image: url('https://images.unsplash.com/photo-1508444845599-5c89863b1c44?w=1200&q=80');
    background-size: cover;
    background-position: center;
    border-radius: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 140px;
    color: rgba(255, 255, 255, 0.25);
    position: relative;
    overflow: hidden;
    box-shadow: 0 30px 80px rgba(28, 99, 238, 0.25);
}

.image-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(28, 99, 238, 0.6) 0%, rgba(0, 191, 165, 0.4) 100%);
    z-index: 1;
}

.image-placeholder i {
    position: relative;
    z-index: 2;
}

.about-text h3 {
    font-size: 32px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 20px;
}

.about-text p {
    font-size: 16px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 30px;
}

.about-list {
    list-style: none;
    padding: 0;
}

.about-list li {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 25px;
}

.about-list i {
    font-size: 24px;
    color: var(--primary-color);
    flex-shrink: 0;
}

.about-list strong {
    display: block;
    font-size: 18px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 5px;
}

.about-list span {
    display: block;
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.6;
}

/* ===== Scroll to Top ===== */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-cyan));
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
}

.scroll-top.active {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(33, 150, 243, 0.4);
}

/* ===== Responsive Design ===== */
@media (max-width: 968px) {
    .hero-title {
        font-size: 42px;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .app-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .app-btn {
        width: 100%;
        max-width: 300px;
    }
    
    .cta-title {
        font-size: 32px;
    }
    
    .cta-subtitle {
        font-size: 16px;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .cta-btn {
        width: 100%;
        max-width: 320px;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .steps {
        flex-direction: column;
    }
    
    .step-connector {
        width: 4px;
        height: 60px;
        margin: 0 auto;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

/* ===== Mobile Navigation ===== */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 56px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 56px);
        background: var(--white);
        flex-direction: column;
        padding: 30px 20px;
        box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        transition: left 0.3s ease;
        gap: 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        width: 100%;
        border-bottom: 1px solid #eee;
    }
    
    .nav-menu a {
        display: block;
        padding: 15px 0;
        font-size: 16px;
    }
    
    .nav-logo {
        height: 28px;
        width: 113px;
    }
    
    .brand-service {
        width: 65px;
        height: 19px;
        font-size: 10px;
    }
    
    .hero-title-main {
        font-size: 42px;
    }
    
    .hero-title-line1 {
        font-size: 22px;
    }
    
    .hero-title-line2 {
        font-size: 36px;
    }
    
    .hero-badge {
        font-size: 14px;
        padding: 8px 20px;
    }
    
    .hero-subtitle {
        font-size: 17px;
    }
    
    .section-title {
        font-size: 36px;
    }
    
    .section-title::after {
        width: 60px;
        height: 3px;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 15px;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
        padding: 16px 35px;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .image-placeholder {
        height: 350px;
        font-size: 100px;
    }
    
    .about-text h3 {
        font-size: 28px;
    }
    
    .section,
    .about,
    .features,
    .how-it-works,
    .benefits,
    .contact {
        padding: 80px 0;
        min-height: auto;
    }
    
    .app-download-title {
        font-size: 18px;
    }
    
    .app-btn {
        padding: 14px 24px;
        min-width: 180px;
    }
    
    .app-btn i {
        font-size: 32px;
    }
    
    .app-btn-label {
        font-size: 16px;
    }
    
    .app-btn-desc {
        font-size: 12px;
    }
    
    .cta-title {
        font-size: 28px;
    }
    
    .cta-subtitle {
        font-size: 15px;
        margin-bottom: 40px;
    }
    
    .cta-btn {
        padding: 16px 30px;
        min-width: 200px;
    }
    
    .cta-btn i {
        font-size: 38px;
    }
    
    .cta-btn-label {
        font-size: 18px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }
    
    .stat-number {
        font-size: 42px;
    }
    
    .about-grid,
    .tech-grid {
        grid-template-columns: 1fr;
    }
    
    .app-btn {
        padding: 12px 20px;
        min-width: 160px;
    }
    
    .app-btn i {
        font-size: 28px;
    }
    
    .app-btn-label {
        font-size: 14px;
    }
    
    .app-btn-desc {
        font-size: 11px;
    }
    
    .cta-download {
        padding: 60px 0;
    }
    
    .cta-title {
        font-size: 24px;
    }
    
    .cta-subtitle {
        font-size: 14px;
        margin-bottom: 30px;
    }
    
    .cta-btn {
        padding: 14px 24px;
        min-width: 180px;
    }
    
    .cta-btn i {
        font-size: 32px;
    }
    
    .cta-btn-label {
        font-size: 16px;
    }
    
    .cta-btn-desc {
        font-size: 11px;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}