@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;800&display=swap');

:root {
    --cyan: #28e0ff;
    --blue: #3da8ff;
    --bg0: #020617;
    --bg1: #07142c;
    --glass: rgba(9,18,40,0.85);
    --border: rgba(61,168,255,0.35);
}

body {
    margin: 0;
    background: linear-gradient(180deg, var(--bg0), var(--bg1));
    font-family: "Inter", sans-serif;
    color: #e6f2ff;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.bg-grid {
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(40,224,255,0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(61,168,255,0.08) 1px, transparent 1px);
    background-size: 40px 40px;
    opacity: .25;
    animation: moveGrid 15s linear infinite;
}

@keyframes moveGrid {
    0% { transform: translateY(0); }
    100% { transform: translateY(40px); }
}

.register-box {
    width: min(420px, 70vw);
    padding: 35px;
    border-radius: 20px;
    background: var(--glass);
    border: 1px solid var(--border);
    backdrop-filter: blur(18px);
    box-shadow: 0 0 30px rgba(40,224,255,0.25);
    animation: fadeUp .6s ease;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(30px); }
    to   { opacity: 1; transform: translateY(0); }
}

.logo-area { text-align: center; }

.logo-img {
    width: 70px; height: 70px;
    border-radius: 50%;
    border: 2px solid rgba(40,224,255,0.55);
    object-fit: cover;
    filter: drop-shadow(0 0 14px rgba(40,224,255,0.55));
}

.logo-text {
    font-size: 22px;
    margin-top: 10px;
    font-weight: 800;
    color: var(--cyan);
    text-shadow: 0 0 14px rgba(40,224,255,0.55);
}

.title {
    text-align: center;
    margin: 22px 0;
    font-size: 20px;
    font-weight: 700;
}

.input { margin-bottom: 15px; }

.input label {
    font-size: 14px;
    opacity: .8;
}

.input input {
    width: 100%;
    padding: 12px;
    margin-top: 6px;
    border-radius: 12px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.10);
    color: white;
    font-size: 15px;
    transition: .25s;
}

.input input:focus {
    border-color: var(--cyan);
    box-shadow: 0 0 15px rgba(40,224,255,0.5);
}

.checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 12px 0 20px;
}

.btn {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 12px;
    background: linear-gradient(90deg, var(--blue), var(--cyan));
    font-weight: 800;
    cursor: pointer;
    font-size: 15px;
    color: #001015;
    box-shadow: 0 0 22px rgba(40,224,255,0.25);
    transition: .3s;
}

.btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 0 40px rgba(40,224,255,0.45);
}

.sub-link {
    margin-top: 16px;
    text-align: center;
    font-size: 14px;
}

.sub-link a {
    color: var(--cyan);
    font-weight: 700;
    text-decoration: none;
}

.popup-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.65);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 99999;
    opacity: 0;
    pointer-events: none;
    transition: .35s ease;
}

.popup-overlay.show {
    opacity: 1;
    pointer-events: auto;
}

.popup-box {
    width: 330px;
    padding: 28px;
    text-align: center;
    border-radius: 18px;
    background: rgba(9,18,40,0.88);
    border: 1px solid var(--border);
    backdrop-filter: blur(18px);
    box-shadow: 0 0 35px rgba(40,224,255,0.35);
    animation: zoom .3s ease;
}

@keyframes zoom {
    from { transform: scale(0.7); opacity: 0; }
    to   { transform: scale(1); opacity: 1; }
}

.popup-box.error {
    border-color: #ff4d4d;
    box-shadow: 0 0 25px rgba(255,0,0,0.5);
}

#popupMessage {
    color: white;
    font-size: 16px;
    margin-bottom: 20px;
}

.popup-btn {
    padding: 10px 22px;
    border-radius: 10px;
    border: none;
    font-weight: 700;
    cursor: pointer;
    background: linear-gradient(90deg, var(--blue), var(--cyan));
    box-shadow: 0 0 20px rgba(40,224,255,0.3);
    transition: .25s;
}

.popup-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 30px rgba(40,224,255,0.55);
}

.input input,
.btn {
    box-sizing: border-box;
    width: 100%;
    display: block;
}

.input label {
    display: block;
    margin-bottom: 6px;
}