:root {
    --color-dark-bg: #0a0a14;
    --color-card-bg: #1a1a2e;
    --color-light-text: #ffffff;
    --color-primary-accent: #00d4ff;
    --color-secondary-accent: #a855f7;
    --color-tertiary-accent: #ff006e;
    --color-hover-link: #00e5ff;

    /* Spacing system */
    --spacing-xs: 8px;
    --spacing-sm: 15px;
    --spacing-md: 20px;
    --spacing-lg: 30px;
    --spacing-xl: 40px;
    --spacing-2xl: 60px;

    /* Border radius */
    --radius-sm: 5px;
    --radius-md: 10px;
    --radius-lg: 15px;
    --radius-xl: 20px;

    /* Shadows */
    --shadow-sm: 0 2px 10px rgba(0, 212, 255, 0.1);
    --shadow-md: 0 5px 20px rgba(0, 212, 255, 0.15);
    --shadow-lg: 0 10px 40px rgba(0, 212, 255, 0.2);
    --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.3);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    --font-primary: 'Noto Sans KR', sans-serif;
    --font-secondary: 'Montserrat', sans-serif;
}

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

body {
    background-color: var(--color-dark-bg);
    color: var(--color-light-text);
    font-family: var(--font-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* ============================================
ANIMATED DIGITAL BACKGROUND
============================================ */
/* Animated grid background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridScroll 20s linear infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes gridScroll {
    0% {
        transform: translateY(0);
    }

    100% {
        transform: translateY(50px);
    }
}

/* Floating particles */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(circle, rgba(0, 212, 255, 0.1) 1px, transparent 1px),
        radial-gradient(circle, rgba(168, 85, 247, 0.1) 1px, transparent 1px);
    background-size: 100px 100px, 150px 150px;
    background-position: 0 0, 50px 50px;
    animation: particleFloat 30s ease-in-out infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes particleFloat {

    0%,
    100% {
        transform: translate(0, 0);
        opacity: 0.3;
    }

    50% {
        transform: translate(20px, 20px);
        opacity: 0.6;
    }
}

/* Digital wave effect */
.digital-waves {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 200px;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.wave {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 200%;
    height: 100%;
    background: linear-gradient(90deg,
            transparent,
            rgba(0, 212, 255, 0.05),
            transparent);
    animation: waveMove 15s linear infinite;
}

.wave:nth-child(2) {
    animation-duration: 20s;
    animation-delay: -5s;
    opacity: 0.5;
}

.wave:nth-child(3) {
    animation-duration: 25s;
    animation-delay: -10s;
    opacity: 0.3;
}

@keyframes waveMove {
    0% {
        transform: translateX(0);
    }

    100% {
        transform: translateX(-50%);
    }
}

/* Content wrapper to layer above backgrounds */
.content-wrapper {
    position: relative;
    z-index: 1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    position: relative;
    z-index: 1;
}

/* ============================================
TYPOGRAPHY & LINKS
============================================ */
a {
    color: var(--color-primary-accent);
    text-decoration: none;
    transition: color var(--transition-base);
    position: relative;
}

a:hover {
    color: var(--color-hover-link);
}

a:focus {
    outline: 2px solid var(--color-primary-accent);
    outline-offset: 4px;
    border-radius: var(--radius-sm);
}

h1,
h2,
h3 {
    font-family: var(--font-secondary);
    color: var(--color-light-text);
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: 2.5em;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
    background: linear-gradient(90deg, var(--color-primary-accent), var(--color-secondary-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary-accent), var(--color-secondary-accent));
    border-radius: 2px;
    animation: glowPulse 2s ease-in-out infinite;
}

@keyframes glowPulse {

    0%,
    100% {
        box-shadow: 0 0 5px var(--color-primary-accent);
    }

    50% {
        box-shadow: 0 0 20px var(--color-primary-accent);
    }
}

/* ============================================
HEADER & NAVIGATION
============================================ */
header {
    background: rgba(26, 26, 46, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(0, 212, 255, 0.2);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.header-banner {
    background: linear-gradient(90deg,
            rgba(0, 212, 255, 0.1),
            rgba(168, 85, 247, 0.1),
            rgba(0, 212, 255, 0.1));
    background-size: 200% 100%;
    animation: gradientShift 5s ease infinite;
    text-align: center;
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid rgba(0, 212, 255, 0.3);
    position: relative;
    overflow: hidden;
}

.header-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    animation: shine 3s infinite;
}

@keyframes gradientShift {

    0%,
    100% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }
}

@keyframes shine {
    0% {
        left: -100%;
    }

    100% {
        left: 200%;
    }
}

.header-banner p {
    color: var(--color-light-text);
    font-family: var(--font-secondary);
    font-size: 0.9em;
    font-weight: 700;
    letter-spacing: 3px;
    text-shadow: 0 0 10px var(--color-primary-accent);
    position: relative;
    z-index: 1;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
}

.logo a {
    font-family: var(--font-secondary);
    font-size: 1.8em;
    font-weight: 700;
    color: var(--color-primary-accent);
    letter-spacing: 2px;
    text-shadow: 0 0 20px rgba(0, 212, 255, 0.5);
    transition: text-shadow var(--transition-base);
}

.logo a:hover {
    text-shadow: 0 0 30px rgba(0, 212, 255, 0.8);
}

nav ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: nowrap;
    
}

nav ul li a {
    color: var(--color-light-text);
    padding: var(--spacing-sm);
    font-weight: 500;
    transition: all var(--transition-base);
    border-radius: var(--radius-sm);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

nav ul li a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary-accent), var(--color-secondary-accent));
    transition: all var(--transition-base);
    transform: translateX(-50%);
}

nav ul li a:hover::before,
nav ul li a.active::before {
    width: 80%;
}

nav ul li a:hover,
nav ul li a.active {
    color: var(--color-primary-accent);
    background: rgba(0, 212, 255, 0.1);
}

/* ============================================
BUTTONS
============================================ */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: var(--radius-md);
    font-weight: 700;
    text-transform: uppercase;
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    letter-spacing: 1px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn.primary {
    background: linear-gradient(135deg, var(--color-primary-accent), var(--color-secondary-accent));
    color: var(--color-dark-bg);
    border: 2px solid transparent;
    box-shadow: var(--shadow-md);
}

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

.btn.outline {
    background: transparent;
    color: var(--color-primary-accent);
    border: 2px solid var(--color-primary-accent);
    margin-top: var(--spacing-lg);
}

.btn.outline:hover {
    background: var(--color-primary-accent);
    color: var(--color-dark-bg);
    box-shadow: var(--shadow-glow);
}

/* ============================================
HERO SECTION
============================================ */
 .hero {
min-height: 40vh;
position: relative;
display: flex;
align-items: center;
justify-content: center;
overflow: hidden;
background: linear-gradient(135deg, #0a0a14 0%, #1a1a2e 100%);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 50%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(168, 85, 247, 0.1) 0%, transparent 50%);
    animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
    0% {
        opacity: 0.5;
        transform: scale(1);
    }

    100% {
        opacity: 1;
        transform: scale(1.1);
    }
}

.hero .container {
    position: relative;
    z-index: 10;
    text-align: center;
}

.hero h1 {
    font-size: 4em;
    background: linear-gradient(135deg, var(--color-primary-accent), var(--color-secondary-accent), var(--color-tertiary-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.3em;
    font-weight: 900;
    animation: titleFloat 3s ease-in-out infinite;
    text-shadow: 0 0 40px rgba(0, 212, 255, 0.3);
}

@keyframes titleFloat {

    0%,
    100% {
        transform: translateY(0);
    }

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

.hero p {
    font-size: 1.5em;
    color: rgba(255, 255, 255, 0.8);
    font-weight: 300;
    animation: fadeInUp 1s ease-out 0.3s both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

/* Hero Slideshow */
.hero-slideshow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-slideshow img {
    position: absolute;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
    filter: brightness(0.4) contrast(1.2);
}

.hero-slideshow img:first-child,
.hero-slideshow img.active {
    opacity: 1;
    z-index: 2;
}

/* ============================================
CARD STYLES
============================================ */
.card {
    background: rgba(26, 26, 46, 0.6);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid rgba(0, 212, 255, 0.2);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

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

/* ============================================
        SITEMAP GRID (Based on news-grid)
        ============================================ */
.sitemap-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    padding-bottom: var(--spacing-2xl);
}

/* ============================================
MAIN SECTIONS
============================================ */
main section {
    padding: var(--spacing-2xl) 0;
    position: relative;
}

/* Latest News */
.latest-news {
    text-align: center;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.news-item {
    background: rgba(26, 26, 46, 0.6);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid rgba(0, 212, 255, 0.2);
    transition: all var(--transition-base);
    position: relative;
}

.news-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.1), transparent);
    transition: left 0.5s;
}

.news-item:hover::before {
    left: 100%;
}

.news-item:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--color-primary-accent);
    box-shadow: 0 15px 40px rgba(0, 212, 255, 0.3);
}

.news-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.news-item:hover img {
    transform: scale(1.1);
}

.news-item h3 {
    padding: var(--spacing-sm) var(--spacing-md) 0;
    font-size: 1.3em;
    color: var(--color-primary-accent);
}

.news-item p {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.95em;
    color: #ccc;
    height: 80px;
    overflow: hidden;
}

.news-item span {
    display: block;
    font-size: 0.8em;
    color: #999;
    padding: 0 var(--spacing-md) var(--spacing-sm);
    text-align: right;
}

/* Featured Tech */
.featured-tech {
    background: linear-gradient(180deg, transparent, rgba(26, 26, 46, 0.3));
    text-align: center;
}

.tech-grid {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

.tech-item {
    background: rgba(26, 26, 46, 0.6);
    backdrop-filter: blur(10px);
    width: 220px;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid rgba(0, 212, 255, 0.2);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.tech-item::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.1) 0%, transparent 70%);
    transition: transform 0.6s;
    transform: scale(0);
}

.tech-item:hover::after {
    transform: scale(1);
}

.tech-item:hover {
    transform: translateY(-10px) scale(1.05);
    border-color: var(--color-primary-accent);
    box-shadow: var(--shadow-glow);
}

.tech-item img {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    border: 2px solid rgba(0, 212, 255, 0.3);
    transition: all var(--transition-base);
}

.tech-item:hover img {
    border-color: var(--color-primary-accent);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.5);
    transform: rotate(5deg) scale(1.1);
}

.tech-item h3 {
    font-size: 1.2em;
    margin-bottom: var(--spacing-xs);
    color: var(--color-secondary-accent);
}

/* ============================================
TRENDS DETAIL PAGE
============================================ */
.trends-detail-section {
    padding: var(--spacing-2xl) 0;
}

.content-layout {
    display: flex;
    gap: var(--spacing-xl);
    align-items: flex-start;
}

.tech-sidebar {
    flex: 0 0 280px;
    background: rgba(26, 26, 46, 0.6);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid rgba(0, 212, 255, 0.2);
    position: sticky;
    top: 100px;
}

.tech-sidebar h2 {
    font-size: 1.6em;
    text-align: left;
    color: var(--color-primary-accent);
    margin-bottom: var(--spacing-md);
    display: block;
}

.tech-sidebar ul {
    list-style: none;
}

.tech-sidebar li {
    margin-bottom: var(--spacing-sm);
}

.tech-sidebar a {
    display: block;
    padding: 12px var(--spacing-sm);
    color: #ccc;
    background: rgba(42, 42, 79, 0.5);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    font-weight: 600;
    border: 1px solid transparent;
}

.tech-sidebar a:hover {
    background: rgba(168, 85, 247, 0.2);
    color: var(--color-light-text);
    border-color: var(--color-secondary-accent);
    transform: translateX(5px);
}

.tech-sidebar a.active {
    background: linear-gradient(135deg, var(--color-primary-accent), var(--color-secondary-accent));
    color: var(--color-dark-bg);
    border-color: var(--color-primary-accent);
}

.tech-content {
    flex: 1;
    background: rgba(26, 26, 46, 0.6);
    backdrop-filter: blur(10px);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.tech-detail {
    display: none;
    animation: fadeInSlide 0.5s ease-in-out;
}

.tech-detail.active {
    display: block;
}

@keyframes fadeInSlide {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

.tech-title {
    font-size: 2.8em;
    background: linear-gradient(135deg, var(--color-primary-accent), var(--color-secondary-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-top: 0;
    padding-bottom: var(--spacing-sm);
    border-bottom: 3px solid rgba(0, 212, 255, 0.3);
}

.tech-detail img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: var(--spacing-md) 0;
    border: 2px solid rgba(0, 212, 255, 0.2);
    transition: transform var(--transition-base);
}

.tech-detail img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-glow);
}

.detail-subtitle {
    font-size: 1.8em;
    color: var(--color-secondary-accent);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.check-list {
    list-style: none;
    margin-left: 0;
    padding-left: 0;
}

.check-list li {
    padding: 12px 0 12px 35px;
    position: relative;
    color: #e0e0e0;
    border-bottom: 1px solid rgba(0, 212, 255, 0.1);
    transition: all var(--transition-fast);
}

.check-list li:hover {
    padding-left: 40px;
    color: var(--color-primary-accent);
}

.check-list li::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: var(--color-primary-accent);
    font-size: 0.8em;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

/* ============================================
NEWSLETTER
============================================ */
.newsletter {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.2), rgba(0, 212, 255, 0.2));
    backdrop-filter: blur(10px);
    text-align: center;
    padding: var(--spacing-2xl) 0;
    border-top: 1px solid rgba(0, 212, 255, 0.3);
    border-bottom: 1px solid rgba(0, 212, 255, 0.3);
}

.newsletter h2 {
    color: var(--color-light-text);
    text-shadow: 0 0 20px rgba(0, 212, 255, 0.5);
}

.newsletter-form {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    max-width: 600px;
    margin: var(--spacing-lg) auto 0;
}

.newsletter-form input[type="email"] {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid rgba(0, 212, 255, 0.3);
    border-radius: var(--radius-md);
    font-size: 1em;
    background: rgba(26, 26, 46, 0.6);
    color: var(--color-light-text);
    transition: all var(--transition-base);
}

.newsletter-form input[type="email"]:focus {
    outline: none;
    border-color: var(--color-primary-accent);
    box-shadow: 0 0 15px rgba(0, 212, 255, 0.3);
}

/* ============================================
FOOTER
============================================ */
footer {
    background: rgba(10, 10, 20, 0.9);
    backdrop-filter: blur(10px);
    padding: var(--spacing-lg) 0;
    text-align: center;
    border-top: 1px solid rgba(0, 212, 255, 0.2);
}

.footer-links a {
    color: #aaa;
    margin: 0 var(--spacing-sm);
    font-size: 0.9em;
    transition: all var(--transition-base);
}

.footer-links a:hover {
    color: var(--color-primary-accent);
    text-shadow: 0 0 10px var(--color-primary-accent);
}

.social-links a img {
    border-radius: 50%;
    transition: transform var(--transition-base);
    border: 2px solid transparent;
}

.social-links a:hover img {
    transform: scale(1.2) rotate(5deg);
    border-color: var(--color-primary-accent);
    box-shadow: 0 0 15px var(--color-primary-accent);
}

/* ============================================
ACCESSIBILITY
============================================ */
*:focus-visible {
    outline: 2px solid var(--color-primary-accent);
    outline-offset: 4px;
    border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================================
RESPONSIVE DESIGN
============================================ */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero h1 {
        font-size: 2.5em;
    }

    .hero p {
        font-size: 1.1em;
    }

    .content-layout {
        flex-direction: column;
    }

    .tech-sidebar {
        flex: 1 1 100%;
        position: static;
    }

    /* === 여기부터가 완성된 부분입니다 === */

    /* 뉴스레터 폼을 세로로 쌓기 */
    .newsletter-form {
        flex-direction: column;
    }

    /* 제목 폰트 크기 줄이기 */
    h2 {
        font-size: 2.1em;
    }

    .tech-title {
        font-size: 2.3em;
    }

    /* 콘텐츠 패딩 줄이기 */
    .tech-content {
        padding: var(--spacing-lg);
    }

    /* tech-grid 아이템 크기 및 갭 조절 */
    .tech-grid {
        gap: var(--spacing-md);
    }

    .tech-item {
        width: 180px;
        /* 너비 살짝 줄이기 */
        padding: var(--spacing-md);
    }

    .tech-item img {
        width: 80px;
        height: 80px;
    }
}