body {
    background: #f3f7fb;
}
#particles-js {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
}
.login-shell {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}
.login-card {
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(0, 191, 255, 0.6);
    border-radius: 24px;
    width: min(100%, 420px);
    box-shadow: 0 22px 40px rgba(15, 23, 42, 0.08);
    padding: 20px 18px 22px;
}
.logo-wrap {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}
.logo-wrap img {
    width: 110px;
    height: 110px;
    object-fit: contain;
    border-radius: 9999px;
    border: 4px solid rgba(0, 191, 255, 0.25);
    background: #fff;
    box-shadow: 0 8px 18px rgba(0, 191, 255, 0.12);
}
.input-field {
    width: 100%;
    min-height: 48px;
    border-radius: 12px;
    border: 1px solid #dbe3ee;
    background: #f8fafc;
    padding: 0.85rem 1rem;
    font-size: 1rem;
    color: #1f2937;
}
.input-field:focus {
    outline: none;
    border-color: #00BFFF;
    box-shadow: 0 0 0 2px rgba(0, 191, 255, 0.15);
    background: #fff;
}
.login-label {
    display: block;
    font-size: 1.05rem;
    font-weight: 700;
    color: #374151;
    margin-bottom: 8px;
}
.login-btn {
    display: block;
    width: 100%;
    border-radius: 12px;
    background: linear-gradient(135deg, #29c2ff 0%, #1b5fb8 100%);
    color: white;
    font-weight: 800;
    font-size: 1.1rem;
    padding: 0.9rem 1rem;
    border: none;
    box-shadow: 0 12px 22px rgba(27, 95, 184, 0.2);
    transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}
.login-btn:hover {
    transform: translateY(-1px);
    filter: brightness(1.02);
    box-shadow: 0 14px 26px rgba(27, 95, 184, 0.24);
}
.back-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin-top: 16px;
    color: #1f3d7a;
    font-weight: 600;
    text-decoration: none;
    transition: opacity 0.2s ease;
}
.back-link:hover {
    opacity: 0.8;
}