:root {
    --bg-color: #f5f5f7;
    --card-bg: #ffffff;
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --accent-blue: #0066cc;
    --app-icon-radius: 18px; /* Classic Apple Squircle ratio for 64px */
    --nav-blur: 30px;
    --navbar-height: 56px;
    --system-font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--system-font);
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    overflow-y: scroll;
}

/* Navbar: Mac App Store Style */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    height: var(--navbar-height);
    background: rgba(245, 245, 247, 0.72);
    backdrop-filter: saturate(180%) blur(var(--nav-blur));
    -webkit-backdrop-filter: saturate(180%) blur(var(--nav-blur));
    z-index: 1000;
    border-bottom: 1px solid rgba(0,0,0,0.08); /* Subtle border */
}

.nav-content {
    max-width: 1440px; /* Wider for 4K */
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
}

.nav-brand {
    font-size: 19px;
    font-weight: 600;
    letter-spacing: -0.01em;
    text-decoration: none;
    color: inherit;
    cursor: pointer;
}

.nav-search {
    flex: 1;
    display: flex;
    justify-content: center;
}

.search-box {
    position: relative;
    width: 320px;
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    color: #86868b;
}

.search-box input {
    width: 100%;
    background: rgba(0,0,0,0.06);
    border: none;
    border-radius: 8px; /* Mac style rounded rect */
    padding: 8px 12px 8px 36px;
    font-size: 14px;
    color: var(--text-primary);
    transition: all 0.2s;
}

.search-box input::placeholder {
    color: #86868b;
}

.search-box input:focus {
    outline: none;
    background: #ffffff;
    box-shadow: 0 0 0 1px rgba(0,0,0,0.1), 0 2px 5px rgba(0,0,0,0.05);
}

.nav-edit {
    background: none;
    border: none;
    color: var(--accent-blue);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
}

.nav-edit:hover {
    text-decoration: underline;
}

/* Main Layout */
.container {
    max-width: 1440px; /* Optimized for 4K */
    margin: var(--navbar-height) auto 0;
    padding: 60px 40px 100px;
}

/* Section Grouping */
#mainContent {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 0 60px;
    align-items: start;
}

.featured-section {
    grid-column: 1 / -1;
}

.category-section {
    margin-bottom: 60px;
    min-width: 0;
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 24px;
    border-bottom: 1px solid rgba(0,0,0,0.04);
    padding-bottom: 12px;
}

.category-title {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: var(--text-primary);
}

/* Featured Horizontal Scroll / Bento (App Store 'Discover' style) */
.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px;
}

.featured-card {
    position: relative;
    background: var(--card-bg);
    border-radius: 20px;
    overflow: hidden;
    text-decoration: none;
    color: var(--text-primary);
    height: 180px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.04);
    transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.3s;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 24px;
    padding: 30px;
}

.featured-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(135deg, rgba(0,0,0,0) 0%, rgba(0,0,0,0.03) 100%);
    pointer-events: none;
}

.featured-card:hover {
    transform: scale(1.02);
    box-shadow: 0 12px 32px rgba(0,0,0,0.1);
}

.featured-card .title-group {
    display: flex;
    flex-direction: column;
    max-width: 65%;
    position: relative;
    z-index: 1;
}

.featured-card .title-group h3 {
    font-size: 26px;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 8px;
}

.featured-card .title-group p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.4;
    font-weight: 400;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.featured-card .icon-wrapper {
    position: relative;
    width: 72px;
    height: 72px;
    border-radius: var(--app-icon-radius);
    flex-shrink: 0;
}

.featured-card .icon-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: inherit;
}

/* High Density App Grid (Glanceability) */
.app-grid {
    display: grid;
    /* Ultra high density for 4K. 80px min size allows huge numbers of icons */
    grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
    gap: 32px 16px;
}

.app-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-primary);
    position: relative;
    transition: transform 0.2s;
}

.app-item:hover {
    transform: scale(1.05);
}

.app-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--app-icon-radius);
    background: #ffffff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06), 0 0 1px rgba(0,0,0,0.1) inset;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px;
    overflow: hidden;
}

.app-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.app-name {
    font-size: 13px;
    font-weight: 500;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100%;
    color: var(--text-primary);
}

/* Edit Mode Overlay - iOS Style Jiggle */
.edit-badge {
    position: absolute;
    top: -6px;
    left: -6px; /* Positioned top left like iOS */
    width: 24px;
    height: 24px;
    background: #e3e3e6;
    border: 1px solid #c7c7cc;
    color: #000;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: bold;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    opacity: 0;
    pointer-events: none;
    z-index: 10;
}

body.editing .edit-badge {
    opacity: 1;
    pointer-events: auto;
}

body.editing .app-item,
body.editing .featured-card {
    animation: jiggle 0.3s infinite linear;
    transform-origin: 50% 50%;
}

body.editing .featured-card {
    overflow: visible;
}

body.editing .app-item:nth-child(even) { animation-direction: reverse; animation-duration: 0.32s; }
body.editing .app-item:nth-child(3n) { animation-duration: 0.28s; }

@keyframes jiggle {
    0% { transform: rotate(-1deg); }
    50% { transform: rotate(1deg); }
    100% { transform: rotate(-1deg); }
}

body.editing .app-item:hover,
body.editing .featured-card:hover {
    transform: scale(1) rotate(0); /* Disable hover scale while editing */
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0; top: 0; width: 100%; height: 100%;
    background-color: rgba(0,0,0,0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.modal-content {
    background-color: #ffffff;
    margin: 12vh auto;
    padding: 32px;
    border-radius: 24px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 24px 48px rgba(0,0,0,0.2);
    position: relative;
    animation: modalScaleIn 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}

@keyframes modalScaleIn {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.modal-header h2 {
    font-size: 20px;
    font-weight: 600;
}

.close-modal {
    font-size: 24px;
    color: #86868b;
    cursor: pointer;
    line-height: 1;
}

.form-group { margin-bottom: 20px; }
.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}
.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 12px;
    background: rgba(0,0,0,0.02);
    font-size: 15px;
    transition: all 0.2s;
}
.form-group input:focus {
    outline: none;
    background: #ffffff;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.1);
}

.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 32px;
}

.btn {
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    flex: 1;
    transition: filter 0.2s;
}
.btn:active { filter: brightness(0.9); }

.btn-primary { background: var(--accent-blue); color: white; }
.btn-secondary { background: #e8e8ed; color: var(--text-primary); }
.btn-danger { background: #ff3b30; color: white; }

/* Empty state */
.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
    font-size: 15px;
}