/* 우주 테마 CSS */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Exo+2:wght@300;400;500;600&display=swap');

:root {
    --space-black: #0a0a0a;
    --deep-space: #1a1a2e;
    --nebula-purple: #16213e;
    --cosmic-blue: #0f3460;
    --star-white: #ffffff;
    --nebula-pink: #e94560;
    --asteroid-gray: #533e85;
    --galaxy-gold: #ffd700;
    --alien-green: #00ff88;
    --plasma-blue: #00d4ff;
}

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

body {
    font-family: 'Exo 2', sans-serif;
    background: linear-gradient(135deg, var(--space-black) 0%, var(--deep-space) 50%, var(--nebula-purple) 100%);
    min-height: 100vh;
    color: var(--star-white);
    position: relative;
    overflow-x: hidden;
}

/* 별들 배경 애니메이션 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(2px 2px at 20px 30px, var(--star-white), transparent),
        radial-gradient(2px 2px at 40px 70px, var(--star-white), transparent),
        radial-gradient(1px 1px at 90px 40px, var(--star-white), transparent),
        radial-gradient(1px 1px at 130px 80px, var(--star-white), transparent),
        radial-gradient(2px 2px at 160px 30px, var(--star-white), transparent);
    background-repeat: repeat;
    background-size: 200px 100px;
    animation: twinkle 4s ease-in-out infinite alternate;
    z-index: -1;
    opacity: 0.7;
}

@keyframes twinkle {
    0% { opacity: 0.3; }
    100% { opacity: 0.8; }
}

/* 컨테이너 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 헤더 */
.header {
    text-align: center;
    padding: 20px 0 15px;
    position: relative;
}

/* 로고 컨테이너 */
.logo-container {
    display: inline-block;
    margin-bottom: 10px;
}

.saturnx-logo {
    max-height: 100px;
    width: auto;
    filter: drop-shadow(0 0 20px rgba(0, 212, 255, 0.5));
    transition: all 0.3s ease;
}

.saturnx-logo:hover {
    transform: scale(1.08);
    filter: drop-shadow(0 0 40px rgba(0, 212, 255, 0.8));
}

.header h1 {
    font-family: 'Orbitron', monospace;
    font-size: 3.5rem;
    font-weight: 900;
    background: linear-gradient(45deg, var(--galaxy-gold), var(--plasma-blue), var(--nebula-pink));
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 3s ease-in-out infinite;
    text-shadow: 0 0 30px rgba(255, 215, 0, 0.3);
}

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

.subtitle {
    font-size: 1.2rem;
    color: var(--plasma-blue);
    margin-top: 10px;
    font-weight: 300;
}

/* 네비게이션 */
.nav {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin: 30px 0;
}

.nav-link {
    color: var(--star-white);
    text-decoration: none;
    padding: 12px 24px;
    border: 2px solid transparent;
    border-radius: 25px;
    background: linear-gradient(135deg, rgba(255,255,255,0.1), rgba(255,255,255,0.05));
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    font-weight: 500;
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.nav-link:hover::before {
    left: 100%;
}

.nav-link:hover {
    border-color: var(--plasma-blue);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
    transform: translateY(-2px);
}

/* 폼 컨테이너 */
.form-container {
    max-width: 500px;
    margin: 0 auto;
    background: linear-gradient(135deg, rgba(22, 33, 62, 0.8), rgba(83, 62, 133, 0.6));
    border-radius: 20px;
    padding: 40px;
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
}

.form-container::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(0, 212, 255, 0.03), transparent);
    animation: rotate 10s linear infinite;
    pointer-events: none;
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.form-title {
    font-family: 'Orbitron', monospace;
    font-size: 2rem;
    text-align: center;
    margin-bottom: 30px;
    color: var(--galaxy-gold);
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.3);
}

/* 폼 그룹 */
.form-group {
    margin-bottom: 25px;
    position: relative;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    color: var(--plasma-blue);
    font-weight: 500;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.form-input {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--star-white);
    font-size: 1rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.form-input:focus {
    outline: none;
    border-color: var(--plasma-blue);
    box-shadow: 0 0 15px rgba(0, 212, 255, 0.2);
    background: rgba(255, 255, 255, 0.08);
}

.form-input::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

/* 버튼 */
.btn {
    background: linear-gradient(135deg, var(--nebula-pink), var(--cosmic-blue));
    color: var(--star-white);
    border: none;
    padding: 15px 40px;
    border-radius: 25px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 5px 15px rgba(233, 69, 96, 0.3);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(233, 69, 96, 0.4);
}

.btn-primary {
    width: 100%;
    margin-top: 0px;
}

/* 메시지 */
.flash-messages {
    margin-bottom: 20px;
}

.flash-message {
    padding: 15px 20px;
    border-radius: 12px;
    margin-bottom: 10px;
    font-weight: 500;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.flash-success {
    background: linear-gradient(135deg, rgba(0, 255, 136, 0.1), rgba(0, 255, 136, 0.05));
    border: 1px solid var(--alien-green);
    color: var(--alien-green);
}

.flash-error {
    background: linear-gradient(135deg, rgba(233, 69, 96, 0.1), rgba(233, 69, 96, 0.05));
    border: 1px solid var(--nebula-pink);
    color: var(--nebula-pink);
}

.flash-info {
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(0, 212, 255, 0.05));
    border: 1px solid var(--plasma-blue);
    color: var(--plasma-blue);
}

.flash-warning {
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.1), rgba(255, 215, 0, 0.05));
    border: 1px solid var(--galaxy-gold);
    color: var(--galaxy-gold);
}

/* 웰컴 페이지 */
.welcome-container {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
    padding: 40px;
}

.welcome-title {
    font-family: 'Orbitron', monospace;
    font-size: 2.5rem;
    margin-bottom: 20px;
    background: linear-gradient(45deg, var(--galaxy-gold), var(--plasma-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-text {
    font-size: 1.2rem;
    line-height: 1.6;
    color: var(--plasma-blue);
    margin-bottom: 30px;
}

/* 대시보드 */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.dashboard-card {
    background: linear-gradient(135deg, rgba(22, 33, 62, 0.6), rgba(83, 62, 133, 0.4));
    border-radius: 15px;
    padding: 30px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease;
}

.dashboard-card:hover {
    transform: translateY(-5px);
}

.card-title {
    font-family: 'Orbitron', monospace;
    font-size: 1.3rem;
    color: var(--galaxy-gold);
    margin-bottom: 15px;
}

.card-content {
    color: var(--plasma-blue);
    line-height: 1.6;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
    .header h1 {
        font-size: 2.5rem;
    }
    
    .nav {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }
    
    .form-container {
        margin: 20px;
        padding: 30px 20px;
    }
    
    .container {
        padding: 10px;
    }
}

/* 로딩 애니메이션 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--plasma-blue);
    animation: spin 0.8s ease-in-out infinite;
}

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