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

body {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    background: linear-gradient(135deg, #0f172a, #312e81, #1e1b4b);
}

.panel {
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 24px;
    width: 100%;
    max-width: 460px;
    padding: 2.5rem 2rem;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.45);
}

.panel-header h1 {
    color: #ffffff;
    font-size: 1.8rem;
    margin-bottom: 0.2rem;
}

.panel-header p {
    color: #a5b4fc;
    font-size: 0.95rem;
    margin-bottom: 2rem;
}

.settings-list {
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
}

.check-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    cursor: pointer;
    padding: 0.9rem 1rem;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.06);
    transition: background 0.3s ease, border-color 0.3s ease;
    user-select: none;
}

.check-item:hover {
    background: rgba(255, 255, 255, 0.09);
}

.check-item input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.checkmark {
    flex-shrink: 0;
    width: 26px;
    height: 26px;
    border-radius: 8px;
    border: 2px solid #6366f1;
    background: rgba(99, 102, 241, 0.15);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, transform 0.2s ease;
}

.checkmark::after {
    content: "";
    width: 12px;
    height: 7px;
    border-left: 3px solid #ffffff;
    border-bottom: 3px solid #ffffff;
    transform: rotate(-45deg) scale(0);
    transition: transform 0.3s cubic-bezier(0.68, -0.55, 0.27, 1.55);
}

.check-item input:checked + .checkmark {
    background: linear-gradient(135deg, #6366f1, #a855f7);
    border-color: #a855f7;
    box-shadow: 0 0 16px rgba(168, 85, 247, 0.7);
}

.check-item input:checked + .checkmark::after {
    transform: rotate(-45deg) scale(1);
}

.check-item input:focus-visible + .checkmark {
    outline: 2px solid #a5b4fc;
    outline-offset: 3px;
}

.check-item:active .checkmark {
    transform: scale(0.9);
}

.check-label {
    color: #e2e8f0;
    font-size: 1rem;
    font-weight: 500;
}

@media (max-width: 420px) {
    .panel {
        padding: 1.8rem 1.2rem;
    }
}