:root {
    --bg-color: #ffffff;
    --text-primary: #000000;
    --text-secondary: #555555;
    --border-color: #000000;
    --font-main: 'Pretendard', sans-serif;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

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

h1, h2, h3, .logo, .footer-logo {
    font-family: var(--font-main);
    font-weight: 700;
}

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

.text-center {
    text-align: center;
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    max-width: 1400px;
    margin: 0 auto;
}

header.scrolled {
    padding: 1rem 5%;
}

.logo {
    font-size: 1.25rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

nav a {
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    transition: var(--transition);
}

nav a:hover {
    color: var(--text-secondary);
}

.separator {
    color: var(--border-color);
    font-size: 0.8rem;
}

/* Hero Section */
.hero {
    position: relative;
    width: 100%;
    min-height: 100vh;
    padding-top: 80px; /* Offset for fixed header */
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-color);
    overflow: hidden;
}

.hero-center-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    background: rgba(255, 255, 255, 0.9);
    padding: 1rem 2rem;
    border: 1px solid var(--border-color);
    white-space: nowrap;
    letter-spacing: 0.05em;
}

.hero-posters {
    display: flex;
    width: 100%;
    height: 70vh;
    gap: 1rem;
    padding: 0 2rem;
}

.poster-item {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.poster-img {
    flex: 1;
    background-size: cover;
    background-position: center;
    border: 1px solid var(--border-color);
    filter: grayscale(100%);
    transition: filter 0.3s ease;
}

.poster-img:hover {
    filter: grayscale(0%);
}

.poster-title {
    margin-top: 1rem;
    text-align: center;
    font-size: 1rem;
    font-weight: 500;
    text-transform: uppercase;
}

/* Containers */
.container {
    padding: 6rem 5%;
    max-width: 1400px;
    margin: 0 auto;
}

.border-top {
    border-top: 1px solid var(--border-color);
}

.section-title {
    font-size: 2rem;
    margin-bottom: 3rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* About Section */
.about-content {
    font-size: 1.2rem;
    color: var(--text-primary);
    line-height: 1.8;
}

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

.card {
    border: 1px solid var(--border-color);
    background: var(--bg-color);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 4px 4px 0px 0px var(--border-color);
}

.card-img {
    height: 250px;
    background-size: cover;
    background-position: center;
    border-bottom: 1px solid var(--border-color);
    filter: grayscale(100%);
    transition: filter 0.3s ease;
}

.card:hover .card-img {
    filter: grayscale(0%);
}

.card-body {
    padding: 1.5rem;
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.card .date {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-weight: 500;
}

.card p {
    font-size: 0.95rem;
}

.img-1 { background-image: url('images/img-1.png'); }
.img-2 { background-image: url('images/img-2.png'); }
.img-3 { background-image: url('images/img-3.png'); }

/* YouTube Section */
.video-wrapper {
    border: 1px solid var(--border-color);
    position: relative;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
}

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

.btn-primary {
    display: inline-block;
    padding: 1rem 3rem;
    background: var(--bg-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    transition: var(--transition);
}

.btn-primary:hover {
    background: var(--text-primary);
    color: var(--bg-color);
}

/* Footer */
footer {
    padding: 4rem 5%;
    border-top: 1px solid var(--border-color);
    background: var(--bg-color);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-logo {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

footer a {
    color: var(--text-primary);
    transition: var(--transition);
}

footer a:hover {
    text-decoration: underline;
}

/* Animations */
.reveal {
    opacity: 0;
    transition: opacity 1s ease;
}

.reveal.active {
    opacity: 1;
}

/* Responsive */
@media (max-width: 768px) {
    .main-title { font-size: 3rem; }
    .header-inner { padding: 1rem 5%; flex-direction: column; gap: 1rem; }
    nav { gap: 1rem; }
    .section-title { font-size: 1.5rem; }

    .hero-center-text {
        font-size: 1.1rem;
        padding: 0.8rem 1.2rem;
        white-space: normal;
        width: 85%;
        max-width: 320px;
        line-height: 1.4;
    }

    .hero-posters {
        height: 50vh;
        gap: 0.5rem;
        padding: 0 1rem;
    }

    .poster-title {
        font-size: 0.7rem;
        margin-top: 0.5rem;
    }
}

/* YouTube SVG styling */
.youtube-svg {
    color: var(--text-primary);
    opacity: 0.5;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.youtube-svg:hover {
    opacity: 1;
    transform: scale(1.08);
}