:root {
    --primary: #0A192F;      /* Deep Modern Dark Blue */
    --secondary: #64FFDA;    /* High-tech Cyan Accent */
    --text: #CCD6F6;
    --white: #FFFFFF;
}

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

body {
    font-family: 'Inter', 'Noto Sans KR', sans-serif;
    background-color: var(--primary);
    color: var(--text);
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.login-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(rgba(10, 25, 47, 0.8), rgba(10, 25, 47, 0.8)), url('../images/admin_bg.png');
    background-size: cover;
    background-position: center;
    z-index: -1;
}

.admin-card {
    background: rgba(17, 34, 64, 0.7);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(100, 255, 218, 0.2);
    padding: 50px;
    border-radius: 20px;
    width: 450px;
    text-align: center;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    animation: fadeIn 1.5s ease;
}

.logo {
    display: flex;
    justify-content: center;
    margin-bottom: 25px;
}

.logo img {
    width: 140px;
    height: auto;
    mix-blend-mode: screen; 
    filter: drop-shadow(0 0 15px rgba(100, 255, 218, 0.4));
    transition: all 0.3s ease;
}

.logo img:hover {
    filter: drop-shadow(0 0 25px rgba(100, 255, 218, 0.8));
    transform: scale(1.02);
}

.login-form {
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.input-group input {
    width: 100%;
    padding: 15px;
    background: rgba(100, 255, 218, 0.05);
    border: 1px solid rgba(100, 255, 218, 0.2);
    border-radius: 8px;
    color: var(--secondary);
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    letter-spacing: 1px;
    outline: none;
    transition: all 0.3s ease;
}

.input-group input:focus {
    background: rgba(100, 255, 218, 0.1);
    border-color: var(--secondary);
    box-shadow: 0 0 15px rgba(100, 255, 218, 0.3);
}

.input-group input::placeholder {
    color: rgba(100, 255, 218, 0.4);
}

.login-btn {
    padding: 15px;
    background: linear-gradient(45deg, var(--secondary), #00BFA5);
    border: none;
    border-radius: 8px;
    color: var(--primary);
    font-weight: 700;
    letter-spacing: 2px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(100, 255, 218, 0.6);
}

.login-btn:active {
    transform: translateY(0);
}

h2 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    opacity: 0.9;
}

.status {
    margin: 20px 0;
    padding: 10px;
    background: rgba(100, 255, 218, 0.1);
    border-radius: 10px;
    font-size: 0.9rem;
    color: var(--secondary);
}

.status-blink {
    display: inline-block;
    width: 10px;
    height: 10px;
    background: var(--secondary);
    border-radius: 50%;
    margin-right: 10px;
    animation: blink 1s infinite alternate;
}

.contact {
    margin-top: 40px;
    font-size: 0.85rem;
    opacity: 0.6;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes blink {
    from { opacity: 0.3; }
    to { opacity: 1; box-shadow: 0 0 10px var(--secondary); }
}