:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --background: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --border: #e2e8f0;
    --shadow: rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    margin: 0;
    background-color: var(--background);
    color: var(--text);
}
main{
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
.container-custom{
    flex-grow: 1;
    width: 100%;
}
.container-inner {
    max-width: 800px;
    margin: 2rem auto;
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.06);
    border: 1px solid var(--border);
    flex-grow: 1;
}


label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text);
}
.dropdown-row {
    display: flex;
    gap: 1.5rem;
    margin-block: 2rem;
}

.custom-dropdown {
    flex: 1;
    position: relative;
}

.dropdown-selected {
    padding: 1rem 3rem 1rem 1.25rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    background-color: var(--card-bg);
    color: #64748b;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%232563eb' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1.25rem center;
    background-size: 1.2em;
    box-shadow: 0 1px 2px var(--shadow);
}

.dropdown-selected:hover {
    border-color: var(--primary-color);
    background-color: #f8fafc;
    transform: translateY(-1px);
    box-shadow: 0 4px 6px var(--shadow);
}

.dropdown-selected.active {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    color: var(--text);
}

.dropdown-options {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    right: 0;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
    z-index: 100;
    max-height: 300px;
    overflow-y: auto;
}

.dropdown-options.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-option {
    padding: 0.75rem 1.25rem;
    cursor: pointer;
    transition: all 0.15s ease;
    font-size: 0.95rem;
}

.dropdown-option:hover {
    background-color: #f1f5f9;
    color: var(--primary-color);
}

.dropdown-option.selected {
    background-color: #eff6ff;
    color: var(--primary-color);
    font-weight: 500;
}

.dropdown-options::-webkit-scrollbar {
    width: 8px;
}

.dropdown-options::-webkit-scrollbar-track {
    background: #f1f5f9;
    border-radius: 4px;
}

.dropdown-options::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

.dropdown-options::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}
}

.checklist {
    margin-top: 2rem;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s ease;
}

.checklist.visible {
    opacity: 1;
    transform: translateY(0);
}

.category {
    margin-bottom: 1.5rem;
    border: 1px solid var(--border);
    padding: 1.25rem;
    border-radius: 8px;
    background-color: var(--card-bg);
    transition: all 0.2s ease;
}

.category:hover {
    box-shadow: 0 2px 4px var(--shadow);
}

.category h3 {
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--primary-color);
    font-size: 1.2rem;
}

.item {
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
}

.item:last-child {
    margin-bottom: 0;
}

.item input[type="checkbox"] {
    appearance: none;
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--border);
    border-radius: 4px;
    margin-right: 0.75rem;
    cursor: pointer;
    position: relative;
    transition: all 0.2s ease;
}

.item input[type="checkbox"]:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.item input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    left: 6px;
    top: 2px;
    width: 4px;
    height: 8px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.item input[type="checkbox"]:hover {
    border-color: var(--primary-color);
}

.item label {
    display: inline;
    margin-left: 0;
    cursor: pointer;
    font-weight: normal;
    position: relative;
}

/* Tooltip styles */
.item label[title] {
    border-bottom: 1px dotted var(--primary-color);
}

.item label[title]:hover::after {
    content: attr(title);
    position: absolute;
    left: 0;
    top: 100%;
    z-index: 1000;
    width: 300px;
    padding: 0.75rem;
    background-color: var(--text);
    color: var(--card-bg);
    font-size: 0.875rem;
    border-radius: 6px;
    box-shadow: 0 4px 6px var(--shadow);
    margin-top: 8px;
    line-height: 1.4;
}
:root {
            --primary: #4f46e5;
            --gray-700: #374151;
            --gray-900: #111827;
            --gray-50: #f9fafb;
            --gray-100: #f3f4f6;
            --gray-600: #4b5563;
        }

        body {
            margin: 0;
        }

        .header {
            background: #fff;
            box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
            border-bottom: 1px solid #e5e7eb;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 4rem;
            position: relative;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            text-decoration: none;
        }

        .icon-filekey {
            color: var(--primary);
            width: 2rem;
            height: 2rem;
        }

        .logo-text {
            font-size: 1.25rem;
            font-weight: bold;
            color: var(--gray-900);
        }

        .nav-desktop {
            display: flex;
            gap: 1.5rem;
        }

        .nav-link {
            color: var(--gray-700);
            text-decoration: none;
            font-size: 1rem;
            font-weight: 500;
            padding: 0.5rem 0;
            border-radius: 0.375rem;
            transition: color 0.2s, background 0.2s;
        }

        .nav-link:hover {
            color: var(--primary);
            background: var(--gray-50);
        }

        .sponsor-desktop {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .sponsor-text {
            color: var(--gray-600);
            font-weight: 500;
            font-size: 1rem;
        }

        .sponsor-desktop img {
            vertical-align: middle;
        }

        .mobile-menu {
            display: none;
            position: relative;
        }

        .mobile-menu-toggle {
            display: none;
        }

        .mobile-menu-label {
            display: block;
            cursor: pointer;
            padding: 0.5rem;
            border-radius: 0.375rem;
            transition: background 0.2s;
        }

        .mobile-menu-label:hover {
            background: var(--gray-100);
        }

        .icon-menu,
        .icon-x {
            display: block;
            width: 1.5rem;
            height: 1.5rem;
            color: #111827;
        }

        .menu-close {
            display: none;
        }

        .mobile-menu-toggle:checked+.mobile-menu-label .menu-open {
            display: none;
        }

        .mobile-menu-toggle:checked+.mobile-menu-label .menu-close {
            display: block;
        }

        .mobile-nav {
            display: none;
            position: fixed;
            top: 4rem;
            left: 0;
            right: 0;
            background: #fff;
            border-top: 1px solid #e5e7eb;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.07);
            z-index: 50;
            padding: 1rem 1.5rem;
            flex-direction: column;
            gap: 0.5rem;
        }

        .mobile-menu-toggle:checked~.mobile-nav {
            display: flex;
        }

        .sponsor-mobile {
            padding-top: 1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        /* Responsive styles */
        @media (max-width: 768px) {

            .footer,
            .container {
                padding-inline: 16px;
            }

            .grid-container {
                margin-inline: 16px;
            }

            .nav-desktop,
            .sponsor-desktop {
                display: none;
            }

            .mobile-menu {
                display: block;
            }
        }

        @media (min-width: 769px) {
            .mobile-menu {
                display: none;
            }
        }

        .footer {
            background: #f9fafb;
            border-top: 1px solid #e5e7eb;
            font-size: 1rem;
        }

        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .footer-top {
            display: flex;
            flex-direction: column-reverse;
            gap: 1.5rem;
            align-items: flex-start;
            justify-content: space-between;
            padding: 2rem 0 0 0;
        }

        .footer-sponsor {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .sponsor-text {
            color: #4b5563;
            font-weight: 500;
        }

        .footer-social {
            display: flex;
            align-items: center;
            gap: 1.5rem;
            margin-bottom: 1rem;
        }

        .footer-social-link {
            color: #4b5563;
            transition: color 0.2s;
            display: flex;
            align-items: center;
        }

        .footer-social-link:hover {
            color: #111827;
        }

        .footer-divider {
            border-top: 1px solid #e5e7eb;
            margin: 1.5rem 0;
        }

        .footer-bottom {
            display: flex;
            flex-direction: column-reverse;
            gap: 1.5rem;
            align-items: flex-start;
            justify-content: space-between;
            padding-bottom: 1.5rem;
        }

        .footer-copy {
            color: #4b5563;
            font-size: 1rem;
            margin-top: 1rem;
        }

        .footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
        }

        .footer-links a {
            color: #4b5563;
            text-decoration: none;
            transition: color 0.2s;
            font-size: 1rem;
        }

        .footer-links a:hover {
            color: #111827;
        }

        @media (min-width: 640px) {

            .footer-top,
            .footer-bottom {
                flex-direction: row;
                align-items: center;
            }

            .footer-copy {
                margin-top: 0;
            }
        }