:root {
    --bg-color: #ffffff;
    --surface-color: #f7f7f7;
    --surface-hover: #efefef;
    --border-color: #e5e5e5;
    --text-main: #171717;
    --text-muted: #737373;
    --accent-color: #3b82f6;
}

.dark {
    --bg-color: #0a0a0a;
    --surface-color: #171717;
    --surface-hover: #262626;
    --border-color: #262626;
    --text-main: #ededed;
    --text-muted: #a1a1a1;
    --accent-color: #60a5fa;
}

html,
body {
    height: 100%;
}

body {
    font-feature-settings: "cv02", "cv03", "cv04", "cv11";
    -webkit-font-smoothing: antialiased;
    overflow: hidden;
}

/* Category Navigation Styles */
.category-sidebar {
    width: 4.5rem;
}

.category-nav-item {
    transition: all 0.2s ease;
}

.category-nav-item:hover {
    background-color: var(--surface-hover);
}

.category-nav-item.active {
    background-color: var(--surface-hover);
    color: var(--accent-color);
}

.category-nav-label,
.category-nav-count {
    display: none;
}

.category-nav-item {
    justify-content: center;
}

@media (min-width: 768px) {
    .category-sidebar {
        width: 140px;
    }

    .category-nav-label,
    .category-nav-count {
        display: inline;
    }

    .category-nav-item {
        justify-content: flex-start;
    }
}

.category-icon-option {
    width: 100%;
    max-width: 3rem;
    aspect-ratio: 1 / 1;
    height: auto;
    justify-self: center;
}

.dark .category-nav-item.active {
    background-color: rgba(96, 165, 250, 0.1);
}

.mask-fade {
    mask-image: linear-gradient(to bottom, black 40%, transparent 100%);
    -webkit-mask-image: linear-gradient(to bottom, black 40%, transparent 100%);
}

.glass-card {
    background: rgba(var(--surface-color), 0.6);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.card-hover {
    transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1),
        box-shadow 0.3s cubic-bezier(0.25, 0.8, 0.25, 1),
        border-color 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.card-hover:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px -8px rgba(0, 0, 0, 0.08);
    border-color: var(--accent-color);
}

.dark .card-hover:hover {
    box-shadow: 0 12px 24px -8px rgba(0, 0, 0, 0.3);
    border-color: rgba(96, 165, 250, 0.3);
}

/* Modal Animation classes managed by JS, but base states here */
#modal-overlay.open {
    display: block;
    opacity: 1;
}

#modal-content.open {
    opacity: 1;
    transform: scale(100%);
}

#category-modal-overlay.open {
    display: block;
    opacity: 1;
}

#category-modal-content.open {
    opacity: 1;
    transform: scale(100%);
}

/* Toast Notification */
.toast {
    background: var(--text-main);
    color: var(--bg-color);
    padding: 0.75rem 1.25rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    animation: slideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: auto;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Default grid layout for link containers */
.link-container {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fill, 250px);
    justify-content: start;
}

@media (max-width: 639px) {
    .link-container {
        grid-template-columns: minmax(0, 1fr);
    }
}