:root {
    --bg-color: #0a0f1d;
    --text-color: #f8fafc;
    --color-muted-purple: #9C7BA6;
    --color-deep-purple: #5D68A6;
    --color-teal: #04ADBF;
    --color-cyan: #04D9D9;
    --color-green: #56BF7B;
    --accent-gradient: linear-gradient(135deg, var(--color-deep-purple) 0%, var(--color-teal) 50%, var(--color-cyan) 100%);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Noto Sans KR', 'Outfit', sans-serif;
    overflow-x: hidden;
    min-height: 100vh;
}

/* Global Immersive Background */
.global-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background:
        radial-gradient(circle at 10% 20%, rgba(93, 104, 166, 0.15), transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(4, 217, 217, 0.15), transparent 40%);
    filter: blur(80px);
}

/* Navigation */
.navbar {
    padding: 2rem;
    position: absolute;
    top: 0;
    width: 100%;
    z-index: 10;
}

.nav-back-link {
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    transition: transform 0.3s ease;
}

.nav-back-link:hover {
    transform: translateX(-5px);
}

.back-icon {
    font-size: 1.5rem;
    color: var(--color-cyan);
}

.nav-title {
    color: #94a3b8;
    font-weight: 500;
}

/* Main Container */
.join-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 4rem 1.5rem;
}

/* Glassmorphism Card */
.join-form-card {
    background: rgba(30, 41, 59, 0.4);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 2rem;
    padding: 4rem 3rem;
    width: 100%;
    max-width: 600px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    position: relative;
    overflow: hidden;
}

/* Hologram Scanline Effect */
.join-form-card::after {
    content: '';
    position: absolute;
    top: -100%;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(transparent, rgba(4, 217, 217, 0.05), transparent);
    animation: scanline 4s linear infinite;
    pointer-events: none;
}

@keyframes scanline {
    0% {
        top: -100%;
    }

    100% {
        top: 100%;
    }
}

.form-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.text-gradient {
    font-size: 2.5rem;
    font-weight: 900;
    letter-spacing: 2px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: #94a3b8;
    font-size: 1.1rem;
}

/* Form Styles */
.join-form {
    display: flex;
    flex-direction: column;
    gap: 1.8rem;
}

.input-group {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.input-group label {
    font-size: 0.95rem;
    font-weight: 700;
    color: #cbd5e1;
    margin-left: 0.5rem;
}

.input-group input,
.input-group select,
.input-group textarea {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 1rem 1.2rem;
    color: #fff;
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.input-group input:focus,
.input-group select:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--color-cyan);
    background: rgba(15, 23, 42, 0.8);
    box-shadow: 0 0 15px rgba(4, 217, 217, 0.2);
}

/* Select Styling */
select option {
    background: var(--bg-color);
}

/* Input Glow Interaction */
.input-glow {
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-cyan);
    box-shadow: 0 0 10px var(--color-cyan);
    transition: all 0.4s ease;
    transform: translateX(-50%);
}

.input-group input:focus~.input-glow,
.input-group select:focus~.input-glow,
.input-group textarea:focus~.input-glow {
    width: 60%;
}

/* Submit Button */
.submit-btn {
    margin-top: 1rem;
    padding: 1.2rem;
    background: var(--accent-gradient);
    border: none;
    border-radius: 12px;
    color: #fff;
    font-size: 1.1rem;
    font-weight: 900;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.8rem;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 10px 20px rgba(93, 104, 166, 0.3);
}

.submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(4, 217, 217, 0.4);
    filter: brightness(1.1);
}

.submit-btn:active {
    transform: scale(0.98);
}

.btn-icon {
    font-size: 1.2rem;
}

/* Success Message */
.success-message {
    text-align: center;
    padding: 2rem 0;
    animation: scaleUp 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes scaleUp {
    from {
        transform: scale(0.8);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.success-icon {
    font-size: 5rem;
    margin-bottom: 2rem;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

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

    50% {
        transform: translateY(-15px);
    }
}

.success-message h2 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
    color: var(--color-cyan);
}

.success-message p {
    color: #94a3b8;
    margin-bottom: 3rem;
    font-size: 1.1rem;
}

.hidden {
    display: none !important;
}

#other-field-container {
    animation: slideDown 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

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

.cta-button {
    text-decoration: none;
    padding: 1rem 2.5rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #fff;
    border-radius: 50px;
    font-weight: 700;
    transition: all 0.3s ease;
}

.cta-button:hover {
    background: var(--color-cyan);
    color: #000;
    border-color: var(--color-cyan);
    box-shadow: 0 0 30px rgba(4, 217, 217, 0.4);
}

/* Animations */
.fade-in {
    animation: fadeIn 1s ease-out forwards;
}

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

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

/* Mobile Responsive */
@media (max-width: 640px) {
    .join-form-card {
        padding: 3rem 1.5rem;
    }

    .text-gradient {
        font-size: 2rem;
    }
}