main {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

#challenges {
    padding: 1rem 0;
}

.header-section {
    text-align: center;
    margin-bottom: 3rem;
}

.header-section h1 {
    font-size: 2.5rem;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.header-section p {
    font-size: 1.1rem;
    color: #6b7280;
}

.upload-bar {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 1rem;
}

.upload-btn {
    padding: 0.5rem 1.2rem;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 999px;
    font-size: 0.95rem;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.2s;
}

.upload-btn:hover {
    background: #1e3a8a;
}

.from-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: bold;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    margin-bottom: 0.6rem;
}

.from-label.official {
    background: #eff6ff;
    color: #1e40af;
}

.from-label.community {
    background: #f0fdf4;
    color: #15803d;
}

/* Modal (shared with owngoals) */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    z-index: 9998;
    display: none;
    align-items: center;
    justify-content: center;
}

.modal-overlay.visible {
    display: flex;
}

.modal {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    width: 100%;
    max-width: 440px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.15);
}

.modal h2 { margin-bottom: 1.5rem; }

.modal .form-group { margin-bottom: 1.25rem; }

.modal .form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.4rem;
    font-size: 0.95rem;
}

.modal .form-group input,
.modal .form-group textarea,
.modal .form-group select {
    width: 100%;
    padding: 0.65rem 0.75rem;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s;
}

.modal .form-group input:focus,
.modal .form-group textarea:focus,
.modal .form-group select:focus {
    border-color: var(--accent-color);
}

.modal-buttons {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.modal-buttons .btn-primary,
.modal-buttons .btn-secondary {
    flex: 1;
    padding: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.modal-buttons .btn-primary {
    background: var(--accent-color);
    color: white;
}

.modal-buttons .btn-primary:hover { background: #1e3a8a; }

.modal-buttons .btn-secondary { background: #e5e7eb; color: var(--text-color); }

.modal-buttons .btn-secondary:hover { background: #d1d5db; }

.search-sort-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 1.25rem;
}

.search-sort-row input {
    flex: 1;
    max-width: 420px;
    padding: 0.65rem 1.2rem;
    border: 2px solid var(--secondary-color);
    border-radius: 999px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s;
    outline: none;
}

.search-sort-row input:focus {
    border-color: var(--accent-color);
}

.sort-select {
    padding: 0.6rem 1rem;
    border: 2px solid var(--secondary-color);
    border-radius: 999px;
    font-size: 0.92rem;
    font-weight: bold;
    background: white;
    color: var(--text-color);
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s;
    font-family: inherit;
    flex-shrink: 0;
}

.sort-select:hover, .sort-select:focus {
    border-color: var(--accent-color);
}

.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    align-items: center;
    margin-bottom: 2rem;
}

.filter-btn {
    padding: 0.35rem 0.9rem;
    border: 2px solid var(--secondary-color);
    border-radius: 999px;
    background: white;
    color: var(--text-color);
    font-size: 0.85rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.filter-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.filter-btn.active {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
}

.status-filter-group {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    gap: 0.5rem;
}

.filter-bar-divider {
    width: 1.5px;
    height: 1.5rem;
    background: var(--secondary-color);
    border-radius: 2px;
    align-self: center;
    opacity: 0.5;
    flex-shrink: 0;
}

.status-filter-btn {
    border-color: #64748b !important;
    color: #64748b !important;
}

.status-filter-btn:hover {
    border-color: #334155 !important;
    color: #334155 !important;
    background: none !important;
}

.status-filter-btn.active {
    background-color: #334155 !important;
    border-color: #334155 !important;
    color: white !important;
}

.other-filter-wrapper {
    position: relative;
    display: inline-flex;
}

.other-dropdown {
    position: absolute;
    top: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    background: white;
    border: 1.5px solid var(--secondary-color);
    border-radius: 10px;
    box-shadow: 0 6px 18px rgba(0,0,0,0.12);
    z-index: 200;
    min-width: 140px;
    padding: 0.3rem;
    display: none;
}

.other-dropdown.visible {
    display: block;
}

.other-dropdown-item {
    display: block;
    width: 100%;
    padding: 0.45rem 0.85rem;
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    border-radius: 7px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-color);
    font-family: inherit;
    transition: background 0.15s, color 0.15s;
}

.other-dropdown-item:hover {
    background: #f3f4f6;
    color: var(--accent-color);
}

.other-dropdown-item.active {
    background: var(--accent-color);
    color: white;
}

.challenges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.challenge-card {
    background-color: var(--primary-color);
    border: 2px solid var(--secondary-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    position: relative;
    display: flex;
    flex-direction: column;
    height: 15rem;
}

.challenge-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-color: var(--accent-color);
}

.challenge-card h2,
.challenge-card h3 {
    font-size: 1.3rem;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    padding-right: 90px;
    flex-shrink: 0;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

/* ─── Category badge: top-right on challenge cards ─── */
.challenges-grid .category-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    margin-bottom: 0;
}

/* ─── Per-category card borders ─── */
.challenges-grid .challenge-card:not([data-category])       { border-color: var(--accent-color); }
.challenges-grid .challenge-card[data-category="strength"]  { border-color: #dc2626; }
.challenges-grid .challenge-card[data-category="endurance"] { border-color: #0284c7; }
.challenges-grid .challenge-card[data-category="speed"]     { border-color: #d97706; }
.challenges-grid .challenge-card[data-category="learning"]  { border-color: #7c3aed; }
.challenges-grid .challenge-card[data-category="recovery"]  { border-color: #16a34a; }
.challenges-grid .challenge-card[data-category="other"]     { border-color: #6b7280; }

.challenges-grid .challenge-card[data-category="strength"]:hover  { border-color: #991b1b; }
.challenges-grid .challenge-card[data-category="endurance"]:hover { border-color: #0369a1; }
.challenges-grid .challenge-card[data-category="speed"]:hover     { border-color: #b45309; }
.challenges-grid .challenge-card[data-category="learning"]:hover  { border-color: #6d28d9; }
.challenges-grid .challenge-card[data-category="recovery"]:hover  { border-color: #15803d; }
.challenges-grid .challenge-card[data-category="other"]:hover     { border-color: #4b5563; }

/* ─── Background image cards ─── */
.challenges-grid .challenge-card.has-bg {
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.challenges-grid .challenge-card.has-bg h2,
.challenges-grid .challenge-card.has-bg h3,
.challenges-grid .challenge-card.has-bg p {
    color: #fff;
    text-shadow: 0 1px 4px rgba(0,0,0,0.6);
}

.challenges-grid .challenge-card.has-bg .points {
    color: #fff;
    text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}

.challenges-grid .challenge-card.has-bg .challenge-footer {
    border-top-color: rgba(255,255,255,0.3);
}

.challenges-grid .challenge-card.has-bg .from-label.official {
    background: rgba(255,255,255,0.2);
    color: #fff;
}

.challenge-card p {
    color: #4b5563;
    line-height: 1.5;
    margin-bottom: 0;
    min-height: 0;
    flex: 1;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
}

.challenge-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--secondary-color);
    flex-shrink: 0;
    margin-top: auto;
}

.points {
    font-weight: bold;
    color: var(--accent-color);
    font-size: 1.1rem;
}

/* Custom Checkbox */
.checkbox-container {
    display: block;
    position: relative;
    cursor: pointer;
    font-size: 22px;
    user-select: none;
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: relative;
    display: inline-block;
    height: 28px;
    width: 28px;
    background-color: var(--primary-color);
    border: 2px solid var(--secondary-color);
    border-radius: 6px;
    transition: all 0.3s;
}

.checkbox-container:hover .checkmark {
    border-color: var(--accent-color);
}

.checkbox-container input:checked ~ .checkmark {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.checkbox-container input:checked ~ .checkmark:after {
    display: block;
}

.checkbox-container .checkmark:after {
    left: 50%;
    top: 46%;
    width: 6px;
    height: 12px;
    border: solid white;
    border-width: 0 3px 3px 0;
    transform: translate(-50%, -50%) rotate(45deg);
}

.image-upload-wrapper {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.image-upload-btn {
    padding: 0.5rem 1rem;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    background: white;
    font-size: 0.88rem;
    font-family: inherit;
    cursor: pointer;
    transition: border-color 0.2s;
    white-space: nowrap;
    flex-shrink: 0;
}

.image-upload-btn:hover { border-color: var(--accent-color); }

.image-filename {
    font-size: 0.82rem;
    color: #9ca3af;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}

.image-filename.has-file { color: var(--text-color); }

.image-remove-btn {
    background: none;
    border: none;
    color: #ef4444;
    font-size: 0.85rem;
    font-weight: bold;
    cursor: pointer;
    padding: 0 0.2rem;
    flex-shrink: 0;
    transition: color 0.2s;
}

.image-remove-btn:hover { color: #dc2626; }

.image-preview {
    width: 100%;
    height: 110px;
    object-fit: cover;
    border-radius: 8px;
    margin-top: 0.5rem;
    border: 1px solid #e5e7eb;
    display: none;
}

.image-preview.visible { display: block; }

/* ─── Dark Mode ─── */
[data-theme="dark"] .header-section p { color: #9ca3af; }

[data-theme="dark"] .modal,
[data-theme="dark"] .other-dropdown { background: #1a1d2e; color: var(--text-color); }

[data-theme="dark"] .modal .form-group input,
[data-theme="dark"] .modal .form-group textarea,
[data-theme="dark"] .modal .form-group select {
    background: #111827; border-color: #3d4163; color: var(--text-color);
}

[data-theme="dark"] .modal-buttons .btn-secondary { background: #2d3148; color: var(--text-color); }
[data-theme="dark"] .modal-buttons .btn-secondary:hover { background: #374170; }
[data-theme="dark"] .modal-buttons .btn-primary:hover { background: #2563eb; }

[data-theme="dark"] .sort-select { background: #1a1d2e; color: var(--text-color); border-color: #3d4163; }
[data-theme="dark"] .filter-btn { background: #1a1d2e; color: var(--text-color); }
[data-theme="dark"] .status-filter-btn { border-color: #9ca3af !important; color: #9ca3af !important; }
[data-theme="dark"] .status-filter-btn:hover { border-color: #d1d5db !important; color: #d1d5db !important; background: none !important; }
[data-theme="dark"] .status-filter-btn.active { background-color: #4b5563 !important; border-color: #4b5563 !important; color: white !important; }

[data-theme="dark"] .other-dropdown-item:hover { background: #2d3148; }

[data-theme="dark"] .from-label.official { background: rgba(30,64,175,0.25); color: #93c5fd; }
[data-theme="dark"] .from-label.community { background: rgba(21,128,61,0.25); color: #86efac; }

[data-theme="dark"] .challenge-card p { color: #9ca3af; }

[data-theme="dark"] .image-upload-btn {
    background: #1a1d2e; border-color: #3d4163; color: var(--text-color);
}
[data-theme="dark"] .image-filename { color: #6b7280; }
[data-theme="dark"] .image-preview { border-color: #3d4163; }

/* Responsive Design */
@media (max-width: 768px) {
    main {
        padding: 1rem;
    }

    .challenges-grid {
        grid-template-columns: 1fr;
    }

    .header-section h1 {
        font-size: 1.8rem;
    }

    .header-section {
        margin-bottom: 1.5rem;
    }

    .search-sort-row {
        flex-direction: column;
        align-items: stretch;
    }

    .search-sort-row input {
        max-width: 100%;
    }

    .sort-select {
        width: 100%;
    }

    .upload-bar {
        justify-content: stretch;
    }

    .upload-btn {
        width: 100%;
        text-align: center;
    }

    .modal {
        margin: 1rem;
        max-width: calc(100vw - 2rem);
        padding: 1.5rem;
    }
}