:root {
    --bg-color: #0f172a;
    --text-color: #f8fafc;

    /* Personal Color Palette */
    --color-muted-purple: #9C7BA6;
    --color-deep-purple: #5D68A6;
    --color-teal: #04ADBF;
    --color-cyan: #04D9D9;
    --color-green: #56BF7B;

    --accent-color: var(--color-cyan);
    --accent-gradient: linear-gradient(135deg, var(--color-deep-purple) 0%, var(--color-teal) 50%, var(--color-cyan) 100%);

    --card-bg: rgba(30, 41, 59, 0.7);
    --nav-bg: rgba(15, 23, 42, 0.95);
    --font-main: 'Noto Sans KR', sans-serif;
}

/* Custom Scrollbar */
html::-webkit-scrollbar,
body::-webkit-scrollbar,
::-webkit-scrollbar {
    width: 21px;
    height: 10px;
}

html::-webkit-scrollbar-track,
body::-webkit-scrollbar-track,
::-webkit-scrollbar-track {
    background: #0f172a;
}

html::-webkit-scrollbar-thumb,
body::-webkit-scrollbar-thumb,
::-webkit-scrollbar-thumb {
    background: rgba(4, 217, 217, 0.4);
    border-radius: 20px;
    border: 3px solid #0f172a;
    transition: background 0.3s ease;
}

html::-webkit-scrollbar-thumb:hover,
body::-webkit-scrollbar-thumb:hover,
::-webkit-scrollbar-thumb:hover {
    background: var(--color-cyan);
    box-shadow: 0 0 20px var(--color-cyan);
}

/* Firefox Support */
* {
    scrollbar-width: auto;
    scrollbar-color: rgba(4, 217, 217, 0.4) #0f172a;
}

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

img {
    max-width: 100%;
}


.hidden {
    display: none !important;
}

/* Global Immersive Styles */
.global-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -2;
    background:
        radial-gradient(circle at 15% 50%, rgba(76, 29, 149, 0.15), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(4, 217, 217, 0.15), transparent 25%);
    filter: blur(80px);
    pointer-events: none;
    animation: auroraFlow 20s infinite alternate ease-in-out;
}

@keyframes auroraFlow {
    0% {
        transform: scale(1);
        opacity: 0.8;
    }

    50% {
        transform: scale(1.1);
        opacity: 1;
    }

    100% {
        transform: scale(1);
        opacity: 0.8;
    }
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
    cursor: auto;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: transparent;
    transition: all 0.3s ease;
    z-index: 1000;
}

.navbar.scrolled {
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    padding: 1rem 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-logo {
    height: 40px;
    width: auto;
}

.nav-title {
    font-weight: 900;
    font-size: 1.5rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

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

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

.nav-links>li>a:hover::after {
    width: 100%;
}

.nav-join-highlight {
    color: var(--color-cyan) !important;
    border: 1px solid var(--color-cyan);
    padding: 0.5rem 1.2rem;
    border-radius: 20px;
    font-weight: 700;
    transition: all 0.3s ease;
}

.nav-join-highlight:hover {
    background: var(--color-cyan);
    color: #0f172a !important;
    box-shadow: 0 0 15px var(--color-cyan);
}

/* Language Dropdown */
.lang-dropdown {
    position: relative;
    display: inline-block;
    padding-bottom: 20px;
    margin-bottom: -20px;
}

.lang-dropbtn {
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--text-color);
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    cursor: pointer;
    font-family: var(--font-main);
    font-weight: 700;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lang-dropbtn:hover {
    background: var(--accent-color);
    color: #0f172a;
}

.lang-dropdown-content {
    display: none;
    position: absolute;
    right: 0;
    background-color: var(--nav-bg);
    min-width: 140px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    border-radius: 10px;
    z-index: 1;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    top: 100%;
    margin-top: -10px;
    animation: fadeIn 0.3s ease;
}

.lang-dropdown-content::before {
    content: "";
    position: absolute;
    top: -20px;
    left: 0;
    width: 100%;
    height: 20px;
    background: transparent;
}

.lang-dropdown-content a {
    color: var(--text-color);
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    transition: background 0.3s;
    font-size: 0.9rem;
}

.lang-dropdown-content a:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--accent-color);
}

.lang-dropdown:hover .lang-dropdown-content {
    display: block;
}

/* Common Section Styles */
.section {
    padding: 8rem 2rem;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
}

.section-subtitle {
    text-align: center;
    color: #94a3b8;
    margin-bottom: 4rem;
    font-size: 1.1rem;
}

/* Footer */
footer {
    background: #020617;
    padding: 4rem 2rem;
    margin-top: 4rem;
    border-top: 1px solid #1e293b;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    text-align: center;
    color: #94a3b8;
}

.footer-logo img {
    height: 50px;
    margin-bottom: 1rem;
    opacity: 0.8;
}

.footer-info p {
    color: #64748b;
    margin-bottom: 0.5rem;
}

/* Global Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

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

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

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* Loading UI Utils */
.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 0.8s linear infinite;
    display: inline-block;
    vertical-align: middle;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Common Utilities */
.glass-card {
    background: rgba(30, 41, 59, 0.4);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 1.5rem;
    padding: 3rem 2rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.glass-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 20px 40px -5px rgba(0, 0, 0, 0.4);
    border-color: rgba(255, 255, 255, 0.2);
}

.text-gradient-animated {
    background: linear-gradient(300deg,
            var(--color-deep-purple),
            var(--color-teal),
            var(--color-cyan),
            var(--color-green),
            var(--color-deep-purple));
    background-size: 300% 300%;
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: gradient-flow 8s ease infinite;
}

@keyframes gradient-flow {
    0% {
        background-position: 0% 50%;
    }

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

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

.hover-glow {
    position: relative;
    z-index: 1;
}

.hover-glow::after {
    content: '';
    position: absolute;
    inset: -2px;
    z-index: -1;
    background: var(--accent-gradient);
    border-radius: inherit;
    opacity: 0;
    transition: opacity 0.4s ease;
    filter: blur(15px);
}

.hover-glow:hover::after {
    opacity: 0.4;
}

/* Staggered Animation Delays */
.delay-100 {
    transition-delay: 100ms;
}

.delay-200 {
    transition-delay: 200ms;
}

.delay-300 {
    transition-delay: 300ms;
}

/* Page Transitions */
.page-transition-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
    z-index: 9999;
    pointer-events: none;
    transition: opacity 0.5s ease;
    opacity: 1;
}

.page-transition-overlay.fade-out {
    opacity: 0;
}

.page-transition-overlay.active {
    opacity: 1;
    pointer-events: all;
}

/* Scrollytelling Reveals */
.reveal-up {
    opacity: 0;
    transform: translateY(50px);
    transition: all 1s cubic-bezier(0.23, 1, 0.32, 1);
}

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

.reveal-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all 1s cubic-bezier(0.23, 1, 0.32, 1);
}

.reveal-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.reveal-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all 1s cubic-bezier(0.23, 1, 0.32, 1);
}

.reveal-right.visible {
    opacity: 1;
    transform: translateX(0);
}