:root {
    /* 2025 Trendy Color Palette */
    --bg-primary: #050505;
    --bg-secondary: #0a0a0a;
    --bg-tertiary: #111111;
    --bg-gradient-start: #0a0a0a;
    --bg-gradient-end: #050510;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;

    --accent-primary: #00ff88;
    /* Neon Green - Growth/Profit */
    --accent-secondary: #00ccff;
    /* Electric Blue - Trust/Tech */
    --accent-danger: #ff3366;
    /* Neon Red - Risk/Loss */
    --accent-purple: #bc13fe;
    /* Neon Purple - Premium */
    --accent-gold: #ffd700;
    /* Gold - Premium Badge */

    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-blur: 20px;

    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;

    --spacing-container: 1200px;
    --header-height: 70px;
}

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

body {
    background: var(--bg-primary);
    background-image:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(0, 255, 136, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 100% 0%, rgba(0, 212, 255, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 0% 100%, rgba(255, 215, 0, 0.04) 0%, transparent 50%),
        linear-gradient(180deg, var(--bg-gradient-start) 0%, var(--bg-primary) 30%, var(--bg-gradient-end) 100%);
    background-attachment: fixed;
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    position: relative;
}

/* 배경 그리드 패턴 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 0;
}

/* 플로팅 오브 효과 */
body::after {
    content: '';
    position: fixed;
    top: 20%;
    right: 10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(0, 255, 136, 0.03) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
    animation: floatOrb 20s ease-in-out infinite;
}

@keyframes floatOrb {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(-30px, 20px) scale(1.1); }
    50% { transform: translate(20px, -30px) scale(0.95); }
    75% { transform: translate(-20px, -20px) scale(1.05); }
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    line-height: 1.2;
    font-weight: 700;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    background: linear-gradient(135deg, #fff 0%, #a0a0a0 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1.5rem;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 1rem;
}

p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.highlight {
    color: var(--accent-primary);
}

.highlight-danger {
    color: var(--accent-danger);
}

/* Layout Utilities */
.container {
    max-width: var(--spacing-container);
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 100px 0;
    position: relative;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 32px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    text-decoration: none;
    border: none;
    outline: none;
}

.btn-primary {
    background: var(--accent-primary);
    color: #000;
    box-shadow: 0 0 20px rgba(0, 255, 136, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 255, 136, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    padding-top: var(--header-height);
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 1000px;
    height: 1000px;
    background: radial-gradient(circle, rgba(0, 255, 136, 0.1) 0%, transparent 70%);
    z-index: -1;
    filter: blur(100px);
}

.hero-content {
    max-width: 800px;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(0, 255, 136, 0.1);
    border: 1px solid rgba(0, 255, 136, 0.3);
    border-radius: 100px;
    color: var(--accent-primary);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 2rem;
    backdrop-filter: blur(5px);
}

/* Value Proposition Cards */
.value-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.card {
    background: linear-gradient(145deg, rgba(20, 20, 25, 0.9) 0%, rgba(10, 10, 15, 0.95) 100%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 24px;
    padding: 40px;
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    z-index: 1;
    box-shadow:
        0 4px 30px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, rgba(0, 255, 136, 0.3) 50%, transparent 100%);
    z-index: 1;
    border-radius: 24px 24px 0 0;
}

.card:hover {
    transform: translateY(-5px);
    border-color: rgba(0, 255, 136, 0.3);
    box-shadow:
        0 8px 40px rgba(0, 0, 0, 0.4),
        0 0 30px rgba(0, 255, 136, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
    display: block;
}

/* Credibility Section */
.credibility-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.credibility-image {
    width: 100%;
    border-radius: 24px;
    background: linear-gradient(45deg, #1a1a1a, #2a2a2a);
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #444;
    font-size: 1.5rem;
}

/* Video Grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-top: 30px;
}

.video-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 255, 136, 0.1);
    border-color: rgba(0, 255, 136, 0.3);
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    /* 16:9 Aspect Ratio */
    height: 0;
    overflow: hidden;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.video-info {
    padding: 20px;
    text-align: left;
}

.video-info h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: #fff;
}

.video-info p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.5;
    margin-bottom: 0;
}

/* Quiz Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    display: flex;
    opacity: 1;
}

.quiz-container {
    background: #111;
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    width: 90%;
    max-width: 600px;
    padding: 40px;
    position: relative;
    transform: scale(0.95);
    transition: transform 0.3s ease;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.modal-overlay.active .quiz-container {
    transform: scale(1);
}

.quiz-progress {
    height: 4px;
    background: #222;
    border-radius: 2px;
    margin-bottom: 30px;
    overflow: hidden;
}

.quiz-progress-bar {
    height: 100%;
    background: var(--accent-primary);
    width: 0%;
    transition: width 0.3s ease;
}

.question-slide {
    display: none;
}

.question-slide.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

.quiz-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color 0.2s;
    z-index: 10;
}

.quiz-close:hover {
    color: #fff;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 30px 0;
}

.quiz-option {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 16px 20px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.quiz-option:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-primary);
    color: #fff;
    transform: translateX(5px);
}

.result-score-circle {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    border: 4px solid var(--accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    font-weight: 700;
    margin: 0 auto 30px;
    color: var(--accent-primary);
    box-shadow: 0 0 30px rgba(0, 255, 136, 0.2);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

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

@media (max-width: 768px) {
    .credibility-grid {
        grid-template-columns: 1fr;
    }

    .video-grid {
        grid-template-columns: 1fr;
    }

    h1 {
        font-size: 2.5rem;
    }

    .section {
        padding: 60px 0;
    }
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    cursor: pointer;
    animation: bounce 2s infinite;
    opacity: 0.7;
    transition: opacity 0.3s;
}

.scroll-indicator:hover {
    opacity: 1;
    color: #fff;
}

.scroll-indicator i {
    margin-top: 10px;
    font-size: 1.5rem;
    color: var(--accent-primary);
}

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateX(-50%) translateY(0);
    }

    40% {
        transform: translateX(-50%) translateY(-10px);
    }

    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}