:root {
    --bg-color: #0A0A0A;
    --text-color: #F5F5F7;
    --text-muted: #A1A1A6;
    --primary-neon: #8A2BE2;
    --secondary-neon: #00FFFF;
    --card-bg: rgba(255, 255, 255, 0.03);
    --card-border: rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, 'Helvetica Neue', 'Segoe UI', 'Apple SD Gothic Neo', 'Noto Sans KR', 'Malgun Gothic', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    transition: background-color 0.3s, backdrop-filter 0.3s;
    border-bottom: 1px solid transparent;
}

.header.scrolled {
    background-color: rgba(10, 10, 10, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--card-border);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(to right, var(--primary-neon), var(--secondary-neon));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.btn-glow {
    background: linear-gradient(135deg, var(--primary-neon), var(--secondary-neon));
    color: #fff;
    border: none;
    position: relative;
    z-index: 1;
}

.btn-glow::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 30px;
    background: linear-gradient(135deg, var(--primary-neon), var(--secondary-neon));
    z-index: -1;
    filter: blur(12px);
    opacity: 0.5;
    transition: opacity 0.3s ease, filter 0.3s ease;
}

.btn-glow:hover::before {
    opacity: 1;
    filter: blur(16px);
}

.btn-glow:hover {
    transform: translateY(-2px);
}

.btn-large {
    padding: 14px 32px;
    font-size: 1.1rem;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
}

.aurora-bg {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 50% 50%, rgba(138, 43, 226, 0.15) 0%, rgba(0, 255, 255, 0.05) 25%, transparent 50%);
    animation: rotateAurora 30s linear infinite;
    z-index: -1;
    pointer-events: none;
}

@keyframes rotateAurora {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.hero-text {
    flex: 1;
    max-width: 600px;
}

.hero-title {
    font-size: 4.2rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -1.5px;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-muted);
    margin-bottom: 40px;
}

.hero-mockup {
    flex: 1;
    display: flex;
    justify-content: center;
    position: relative;
}

.floating-mockup {
    width: 100%;
    max-width: 320px;
    border-radius: 40px;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.6), 0 0 40px rgba(138, 43, 226, 0.2);
    animation: float 6s ease-in-out infinite;
    border: 8px solid #1a1a1a;
}

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

/* Features */
.features {
    padding: 150px 0;
}

.feature-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 180px;
    gap: 50px;
}

.feature-row.reverse {
    flex-direction: row-reverse;
}

.feature-row:last-child {
    margin-bottom: 0;
}

.feature-text {
    flex: 1;
}

.gradient-text {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 20px;
    letter-spacing: -1px;
    background: linear-gradient(to right, var(--primary-neon), var(--secondary-neon));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.feature-text p {
    font-size: 1.25rem;
    color: var(--text-muted);
}

.feature-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Compression Demo */
.compression-demo {
    display: flex;
    align-items: center;
    gap: 30px;
    background: var(--card-bg);
    padding: 50px;
    border-radius: 24px;
    border: 1px solid var(--card-border);
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.file-size {
    font-size: 3.5rem;
    font-weight: 800;
    color: #fff;
    text-align: center;
    font-variant-numeric: tabular-nums;
}

.file-size.before {
    color: var(--text-muted);
    text-decoration: line-through;
}

.file-size.after {
    color: var(--secondary-neon);
    text-shadow: 0 0 20px rgba(0, 255, 255, 0.4);
}

.unit {
    font-size: 1.5rem;
    margin-left: 5px;
}

.arrow {
    font-size: 2.5rem;
    color: var(--primary-neon);
}

/* Resize Card */
.resize-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 24px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.resize-card img {
    width: 100%;
    border-radius: 12px;
    display: block;
}

.resize-controls {
    display: flex;
    justify-content: space-between;
    margin-top: 15px;
    font-family: monospace;
    font-size: 1.1rem;
    color: var(--secondary-neon);
    background: rgba(0,0,0,0.5);
    padding: 12px 20px;
    border-radius: 10px;
}

/* Format Icons */
.format-icons {
    display: flex;
    gap: 24px;
    position: relative;
}

.format-icon {
    width: 110px;
    height: 110px;
    background: linear-gradient(135deg, #111, #222);
    border-radius: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.6rem;
    border: 1px solid var(--card-border);
    box-shadow: 0 15px 35px rgba(0,0,0,0.5);
    animation: rotateIcon 12s linear infinite;
}

.format-icon.heic { animation-delay: 0s; color: var(--primary-neon); }
.format-icon.png { animation-delay: -4s; color: var(--secondary-neon); }
.format-icon.jpg { animation-delay: -8s; color: #fff; }

@keyframes rotateIcon {
    0% { transform: perspective(600px) rotateY(0deg); }
    100% { transform: perspective(600px) rotateY(360deg); }
}

/* Benefits Section (3D Hologram Cards) */
.benefits {
    padding: 150px 0;
    background-color: #030303;
    position: relative;
}

.section-title {
    text-align: center;
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 80px;
    letter-spacing: -1px;
}

.cards-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    perspective: 1500px;
}

.benefit-card {
    background: #0d0d0d;
    border-radius: 24px;
    padding: 50px 40px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.15s ease-out;
    cursor: crosshair;
}

/* Option B: 화려한 홀로그램 테두리 및 빛 효과 */
.benefit-card::before,
.benefit-card::after {
    content: '';
    position: absolute;
    inset: -3px; /* 두꺼운 테두리 */
    border-radius: 26px; /* 내부 요소보다 살짝 크게 */
    /* 마우스 위치에 반응하는 무지갯빛 코닉 그라데이션 */
    background: conic-gradient(
        from 0deg at var(--mouse-x, 50%) var(--mouse-y, 50%),
        var(--secondary-neon) 0%,
        #ff00ff 25%,
        var(--primary-neon) 50%,
        #0055ff 75%,
        var(--secondary-neon) 100%
    );
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: -1;
}

.benefit-card::after {
    filter: blur(20px);
}

.benefit-card:hover::before,
.benefit-card:hover::after {
    opacity: 1;
}

/* 내부 콘텐츠 3D 팝 효과 및 배경 보호용 패널 */
.card-content-wrapper {
    position: absolute;
    inset: 1px; /* 테두리가 보이도록 안쪽으로 살짝 들임 */
    background: #111;
    border-radius: 23px;
    z-index: 0;
}

.card-content {
    position: relative;
    z-index: 2;
    transform: translateZ(50px); /* 3D 입체감 강화 */
    pointer-events: none;
    padding: 50px 40px;
    height: 100%;
}

.benefit-card h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: #fff;
    font-weight: 700;
}

.benefit-card p {
    color: var(--text-muted);
    font-size: 1.1rem;
    line-height: 1.6;
}

/* 내부 눈부심(Glare) 효과 */
.glare {
    position: absolute;
    inset: 0;
    border-radius: 23px;
    background: radial-gradient(
        circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
        rgba(255, 255, 255, 0.8),
        transparent 40%
    );
    mix-blend-mode: overlay;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    z-index: 1;
}

.benefit-card:hover .glare {
    opacity: 1;
}

/* Footer */
.footer {
    padding: 120px 0 60px;
    text-align: center;
    border-top: 1px solid var(--card-border);
}

.footer-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 50px;
    letter-spacing: -1px;
}

.footer-btn {
    margin-bottom: 100px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    color: var(--text-muted);
    font-size: 1rem;
}

.footer-bottom a {
    transition: color 0.3s;
}

.footer-bottom a:hover {
    color: var(--secondary-neon);
}

/* Animations (Scroll) */
.fade-up {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1), transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 992px) {
    .hero-content {
        flex-direction: column;
        text-align: center;
        margin-top: 60px;
    }
    .hero-text {
        margin-bottom: 80px;
    }
    .hero-title {
        font-size: 3.5rem;
    }
    .feature-row, .feature-row.reverse {
        flex-direction: column;
        text-align: center;
        gap: 60px;
    }
    .cards-container {
        grid-template-columns: repeat(2, 1fr);
    }
    .compression-demo {
        flex-direction: column;
        gap: 15px;
    }
    .arrow {
        transform: rotate(90deg);
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.8rem;
    }
    .gradient-text {
        font-size: 2.2rem;
    }
    .cards-container {
        grid-template-columns: 1fr;
    }
    .footer-title {
        font-size: 2.2rem;
    }
    .footer-bottom {
        flex-direction: column;
        gap: 15px;
    }
}