:root {
    --bg-main: #1A1C23;
    --bg-card: rgba(30, 33, 43, 0.6);
    --text-main: #E2E8F0;
    --text-muted: #A0AEC0;
    --accent-1: #B4AEE8;
    --accent-2: #F3C5C5;
    --glass-border: rgba(255, 255, 255, 0.06);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.2);
    --font-primary: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

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

html {
    scroll-behavior: smooth;
    font-family: var(--font-primary);
    background-color: var(--bg-main);
    color: var(--text-main);
    overflow-x: hidden;
}

body {
    position: relative;
    overflow-x: hidden;
    line-height: 1.6;
}

/* Animated Background Blobs */
.background-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    background: radial-gradient(circle at center, #2A2E39 0%, var(--bg-main) 100%);
}

.blob {
    position: absolute;
    filter: blur(80px);
    border-radius: 50%;
    animation: float 20s infinite ease-in-out alternate;
}

.blob-1 {
    top: -10%;
    left: -10%;
    width: 50vw;
    height: 50vw;
    background: #B4AEE8;
    animation-delay: 0s;
    opacity: 0.15;
}

.blob-2 {
    bottom: -20%;
    right: -10%;
    width: 60vw;
    height: 60vw;
    background: #F3C5C5;
    animation-delay: -5s;
    opacity: 0.15;
}

.blob-3 {
    top: 40%;
    left: 50%;
    width: 40vw;
    height: 40vw;
    background: #C1E1D2;
    animation-delay: -10s;
    opacity: 0.15;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(5vw, 10vh) scale(1.1); }
    66% { transform: translate(-5vw, 5vh) scale(0.9); }
    100% { transform: translate(0, -10vh) scale(1); }
}

/* Glassmorphism utility */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    box-shadow: var(--glass-shadow);
    padding: 2.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px 0 rgba(180, 174, 232, 0.1);
    border-color: rgba(180, 174, 232, 0.2);
}

/* Typography */
h1, h2, h3, h4 {
    line-height: 1.2;
    margin-bottom: 1rem;
    font-weight: 700;
}

.section-title {
    font-size: 2.5rem;
    margin: 0 auto 3rem auto;
    text-align: center;
    background: linear-gradient(135deg, var(--text-main) 0%, var(--text-muted) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    position: relative;
    display: table;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
    border-radius: 2px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem 5%;
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(26, 28, 35, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 5%;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    text-decoration: none;
    color: var(--text-main);
    letter-spacing: -1px;
}

.logo span {
    color: var(--accent-1);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 1.1rem;
    transition: color 0.3s ease;
    position: relative;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--text-main);
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background: var(--accent-1);
    transition: width 0.3s ease;
}

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
}

.hamburger span {
    width: 30px;
    height: 3px;
    background-color: var(--text-main);
    border-radius: 2px;
    transition: 0.3s;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    outline: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-1), #C5BCEB);
    color: #1A1C23;
    box-shadow: 0 4px 15px rgba(180, 174, 232, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(180, 174, 232, 0.5);
}

.btn-secondary {
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(5px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--text-main);
    transform: translateY(-3px);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0 5%;
}

.hero-content {
    max-width: 900px;
    z-index: 10;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 1s forwards cubic-bezier(0.2, 0.8, 0.2, 1);
}

.badge {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: rgba(180, 174, 232, 0.15);
    border: 1px solid rgba(180, 174, 232, 0.3);
    color: var(--accent-1);
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    letter-spacing: 1px;
}

.hero h1 {
    font-size: clamp(3rem, 8vw, 6rem);
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #fff, var(--accent-1), var(--accent-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 200% auto;
    animation: gradientShift 5s ease infinite;
}

.hero .tagline {
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    color: var(--text-muted);
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
}

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

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Layout Utilities */
.section {
    padding: 4rem 5%;
    position: relative;
    z-index: 10;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: stretch;
}

.about-text h3 {
    font-size: 2rem;
    color: var(--accent-1);
    margin-bottom: 1.5rem;
}

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

.about-text strong {
    color: var(--text-main);
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.feature-item {
    display: flex;
    gap: 1.5rem;
}

.feature-icon {
    font-size: 2.5rem;
    background: rgba(255, 255, 255, 0.05);
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 15px;
    border: 1px solid var(--glass-border);
}

.feature-content h4 {
    font-size: 1.3rem;
    color: var(--accent-1);
}

.feature-content p {
    color: var(--text-muted);
}

/* Tech Section */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
}

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

.tech-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    display: inline-block;
    filter: drop-shadow(0 0 10px rgba(180, 174, 232, 0.3));
}

.tech-card h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-main);
}

.tech-list {
    list-style: none;
    text-align: left;
}

.tech-list li {
    padding: 0.8rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    color: var(--text-muted);
}

.tech-list li:last-child {
    border-bottom: none;
}

.tech-list strong {
    color: var(--accent-1);
    margin-right: 0.5rem;
}

/* Timeline / Life Section */
.timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent-1), var(--accent-2));
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -1px;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    background-color: inherit;
    width: 50%;
}

.timeline-item.left {
    left: 0;
}

.timeline-item.right {
    left: 50%;
}

.timeline-item::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    right: -10px;
    background-color: var(--bg-main);
    border: 4px solid var(--accent-1);
    top: 50%;
    transform: translateY(-50%);
    border-radius: 50%;
    z-index: 1;
}

.timeline-item.right::after {
    left: -10px;
    border-color: var(--accent-2);
}

.timeline-content {
    position: relative;
    padding: 2rem;
}

.semester {
    display: inline-block;
    padding: 0.3rem 1rem;
    background: rgba(255,255,255,0.08);
    border-radius: 20px;
    color: var(--accent-1);
    font-weight: bold;
    margin-bottom: 1rem;
}

.timeline-item.right .semester {
    color: var(--accent-2);
}

.life-rules {
    margin-top: 4rem;
    padding: 2rem;
    text-align: center;
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--glass-border);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.life-rules .rules-title {
    color: var(--accent-1);
    font-size: 1.2rem;
    margin-bottom: 1rem;
    letter-spacing: 1px;
}

.life-rules .rules-value {
    font-size: 1.2rem;
    color: var(--text-main);
    line-height: 1.6;
}

.life-rules strong {
    color: var(--accent-2);
    font-size: 1.4rem;
}

/* Contact Section */
.contact-card {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.contact-desc {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    background: rgba(0,0,0,0.2);
    padding: 1.5rem;
    border-radius: 15px;
    border: 1px solid var(--glass-border);
}

.contact-item .label {
    display: block;
    color: var(--accent-1);
    font-size: 0.9rem;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
}

.contact-item .value {
    font-size: 1.5rem;
    color: var(--text-main);
    text-decoration: none;
    font-weight: 600;
}

.contact-item a.value:hover {
    text-decoration: underline;
    color: var(--accent-1);
}

.sub-text {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Footer */
footer {
    padding: 3rem 5%;
    border-top: 1px solid var(--glass-border);
    background: rgba(0,0,0,0.2);
    position: relative;
    z-index: 10;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    text-align: center;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-muted);
}

.footer-logo span {
    color: var(--text-main);
}

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

/* Responsive Design */
@media screen and (max-width: 992px) {
    .about-grid {
        grid-template-columns: 1fr;
    }
}

@media screen and (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        height: 100vh;
        width: 70%;
        background: rgba(26, 28, 35, 0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: right 0.4s ease;
        border-left: 1px solid var(--glass-border);
    }

    .nav-links.active {
        right: 0;
    }

    .hamburger {
        display: flex;
        z-index: 1001;
    }

    .hamburger.active span:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }

    .timeline::after {
        left: 31px;
    }
    
    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
    }
    
    .timeline-item.right {
        left: 0;
    }
    
    .timeline-item::after, .timeline-item.right::after {
        left: 21px;
    }
}

/* Reveal Animations */
.reveal {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Video Grid */
.video-section {
    margin-top: 5rem;
}

.video-section h3 {
    text-align: center;
    color: var(--accent-1);
    margin-bottom: 2rem;
    font-size: 1.8rem;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.video-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 15px;
    padding: 1rem;
    box-shadow: var(--glass-shadow);
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.video-card:hover {
    transform: translateY(-5px);
    border-color: rgba(180, 174, 232, 0.4);
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: 10px;
    margin-bottom: 1.2rem;
    background: #000;
}

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

.video-title {
    font-size: 0.95rem;
    color: var(--text-main);
    text-align: center;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    font-weight: 500;
}