* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    color: #ecf5ff;
    background:
        radial-gradient(circle at 10% 20%, rgba(100, 190, 255, 0.28), transparent 40%),
        radial-gradient(circle at 80% 10%, rgba(0, 198, 255, 0.18), transparent 35%),
        linear-gradient(120deg, #081120 0%, #0f1f35 45%, #13283f 100%);
}

.background-glow {
    position: fixed;
    inset: 0;
    background: linear-gradient(to right, rgba(255, 255, 255, 0.08), transparent 20%, transparent 80%, rgba(255, 255, 255, 0.08));
    pointer-events: none;
}

.shell {
    width: min(1100px, 92%);
    margin: 40px auto 80px;
}

.glass {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(194, 228, 255, 0.35);
    border-radius: 22px;
    box-shadow:
        0 0 0 1px rgba(255, 255, 255, 0.08) inset,
        0 20px 60px rgba(5, 12, 20, 0.45);
    backdrop-filter: blur(10px);
}

.login-card {
    padding: 34px;
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.brand {
    letter-spacing: 4px;
    font-weight: 600;
    color: #d9f1ff;
    opacity: 0.85;
}

h1 {
    margin: 8px 0 10px;
    font-size: clamp(1.8rem, 3.2vw, 2.7rem);
}

.subhead {
    margin: 0 auto 24px;
    width: min(80ch, 90%);
    color: #cde8ff;
}

.btn {
    display: inline-block;
    padding: 12px 26px;
    border-radius: 13px;
    border: 1px solid rgba(150, 216, 255, 0.78);
    color: #f1f9ff;
    background: linear-gradient(180deg, rgba(93, 163, 227, 0.35), rgba(40, 90, 148, 0.42));
    text-decoration: none;
    cursor: pointer;
}

.btn:hover {
    filter: brightness(1.09);
}

.about {
    margin-top: 20px;
    color: #d3e8fa;
}

.section-wrap {
    margin-top: 40px;
}

.section-wrap h2 {
    font-size: 1.2rem;
    margin-bottom: 14px;
    color: #dcf2ff;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
}

.card {
    padding: 18px;
}

.card h3 {
    margin-top: 0;
    margin-bottom: 8px;
}

.card p {
    margin-top: 0;
    color: #d7e7f7;
}

.card a {
    color: #9de4ff;
    text-decoration: none;
}

.videos iframe {
    width: 100%;
    height: 200px;
    margin-top: 8px;
    border: 0;
    border-radius: 12px;
}

.admin-page .shell {
    max-width: 980px;
}

.admin-card {
    padding: 26px;
}

.admin-form {
    display: grid;
    gap: 10px;
}

.wide-form label {
    display: grid;
    gap: 6px;
}

input,
textarea {
    width: 100%;
    border: 1px solid rgba(182, 223, 255, 0.4);
    border-radius: 10px;
    background: rgba(9, 30, 48, 0.58);
    color: #e9f6ff;
    padding: 10px;
}

textarea {
    resize: vertical;
}

.item-row {
    display: grid;
    gap: 8px;
    grid-template-columns: 1.1fr 1.2fr 1.3fr auto;
    align-items: center;
    margin-bottom: 8px;
}

.mini {
    border: 1px solid rgba(184, 228, 255, 0.45);
    border-radius: 8px;
    padding: 8px 12px;
    background: rgba(91, 150, 210, 0.3);
    color: #ecf6ff;
    cursor: pointer;
}

.mini.danger {
    background: rgba(191, 71, 94, 0.35);
}

.save-btn {
    margin-top: 14px;
    justify-self: start;
}

.notice {
    padding: 10px 12px;
    border-radius: 10px;
    margin: 6px 0 14px;
}

.notice.success {
    background: rgba(84, 177, 129, 0.27);
    border: 1px solid rgba(144, 222, 183, 0.4);
}

.notice.error {
    background: rgba(206, 80, 106, 0.26);
    border: 1px solid rgba(234, 153, 171, 0.48);
}

@media (max-width: 880px) {
    .item-row {
        grid-template-columns: 1fr;
    }
}