explorer.css

/* ==========================================================================
   DIU Notes Buddy - Clean & Premium Explorer Styling
   ========================================================================== */

:root {
    /* Premium Slate/Indigo Dark Theme (Default) */
    --bg-start: #040810;
    --bg: #090e1a;
    --surface: #111827;
    --surface-hover: #1e293b;
    --muted: #94a3b8;
    --text: #f8fafc;
    --text-light: #cbd5e1;
    --accent: #3b82f6;
    /* Premium Royal Blue */
    --accent-2: #10b981;
    /* Emerald Green */
    --accent-rgb: 59, 130, 246;
    --accent-2-rgb: 16, 185, 129;
    --border: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(59, 130, 246, 0.3);
    --glass: rgba(17, 24, 39, 0.75);
    --radius: 16px;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.6);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

:root[data-theme='soft'] {
    /* Premium Light Slate/Cream Theme */
    --bg-start: #f1f5f9;
    --bg: #f8fafc;
    --surface: #ffffff;
    --surface-hover: #f1f5f9;
    --muted: #64748b;
    --text: #0f172a;
    --text-light: #334155;
    --accent: #2563eb;
    --accent-2: #059669;
    --accent-rgb: 37, 99, 235;
    --accent-2-rgb: 5, 150, 105;
    --border: rgba(15, 23, 42, 0.08);
    --border-hover: rgba(37, 99, 235, 0.25);
    --glass: rgba(255, 255, 255, 0.8);
    --shadow: 0 8px 30px rgba(15, 23, 42, 0.06);
    --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.1);
}

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

body {
    margin: 0;
    display: flex;
    height: 100vh;
    overflow: hidden;
    background: linear-gradient(180deg, var(--bg-start) 0%, var(--bg) 100%);
    color: var(--text);
    font-family: 'Inter', 'Outfit', system-ui, -apple-system, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.6;
}

/* Sidebar Layout */
aside.sidebar {
    width: 260px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 2rem 1rem;
    background: var(--surface);
    border-right: 1px solid var(--border);
    box-shadow: 4px 0 25px rgba(0, 0, 0, 0.15);
    flex-shrink: 0;
    z-index: 10;
    transition: var(--transition);
}

.sidebar-top {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.brand {
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    font-size: 1.3rem;
    font-family: 'Outfit', sans-serif;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: -0.02em;
    padding-left: 0.5rem;
}

.brand-icon-img {
    width: 28px;
    height: 28px;
    object-fit: contain;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    padding: 0.75rem 1rem;
    border-radius: 10px;
    color: var(--text-light);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
    border: 1px solid transparent;
}

.nav-item i {
    font-size: 1.2rem;
    color: var(--muted);
    transition: var(--transition);
}

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

.nav-item:hover i {
    color: var(--accent);
}

.nav-item.active {
    background: rgba(var(--accent-rgb), 0.12);
    color: var(--accent);
    border-color: rgba(var(--accent-rgb), 0.15);
    font-weight: 600;
}

.nav-item.active i {
    color: var(--accent);
}

.sidebar-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    border-top: 1px solid var(--border);
    padding-top: 1.5rem;
}

.back-btn {
    flex: 1;
    padding: 0.65rem 1rem;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    color: var(--text-light);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

:root[data-theme='soft'] .back-btn {
    background: rgba(15, 23, 42, 0.03);
}

.back-btn i {
    color: var(--muted);
    transition: var(--transition);
}

.back-btn:hover {
    transform: translateY(-2px);
    background: rgba(var(--accent-rgb), 0.06);
    color: var(--accent);
    border-color: rgba(var(--accent-rgb), 0.4);
    box-shadow: var(--shadow);
}

.back-btn:hover i {
    color: var(--accent);
}

/* Theme Toggle inside explorer */
.theme-toggle {
    width: 40px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    color: var(--text-light);
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
}

:root[data-theme='soft'] .theme-toggle {
    background: rgba(15, 23, 42, 0.03);
}

.theme-toggle:hover {
    color: var(--accent);
    background: rgba(var(--accent-rgb), 0.06);
    border-color: rgba(var(--accent-rgb), 0.4);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* Main Explorer Viewport */
.explorer-main {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
    position: relative;
}

/* Header & Breadcrumbs */
.explorer-header {
    padding: 1.5rem 2.5rem;
    background: var(--glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    flex-shrink: 0;
}

.header-path {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.4rem 0.6rem;
    font-size: 0.95rem;
    color: var(--text-light);
    max-width: 60%;
}

.breadcrumb-item {
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    font-weight: 500;
}

.breadcrumb-item:hover {
    color: var(--accent);
}

.breadcrumb-separator {
    color: var(--muted);
    font-size: 0.8rem;
}

.breadcrumb-item.active {
    color: var(--text);
    font-weight: 700;
    pointer-events: none;
}

/* Search Wrapper */
.search-wrapper {
    position: relative;
    width: 280px;
    max-width: 100%;
}

.search-icon {
    position: absolute;
    left: 0.85rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--muted);
    font-size: 1.05rem;
    pointer-events: none;
    transition: var(--transition);
}

#file-search {
    width: 100%;
    padding: 0.6rem 1rem 0.6rem 2.5rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text);
    font-family: inherit;
    font-size: 0.9rem;
    outline: none;
    transition: var(--transition);
}

#file-search:focus {
    border-color: var(--accent);
    box-shadow: 0 0 12px rgba(var(--accent-rgb), 0.15);
}

#file-search:focus+.search-icon {
    color: var(--accent);
}

/* Grid layout for files/folders */
.file-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    padding: 2.5rem;
    overflow-y: auto;
    align-content: start;
    flex-grow: 1;
}

/* File/Folder Cards styling - Premium Redesign */
.file-card {
    background: linear-gradient(145deg, var(--surface) 0%, rgba(var(--accent-rgb), 0.02) 100%);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-decoration: none;
    color: var(--text);
    display: flex;
    flex-direction: column;
    transition: all 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    position: relative;
    overflow: hidden;
    min-height: 180px;
    z-index: 1;
}

:root[data-theme='soft'] .file-card {
    background: linear-gradient(145deg, var(--surface) 0%, rgba(var(--accent-rgb), 0.03) 100%);
    box-shadow: 0 4px 15px rgba(15, 23, 42, 0.04);
}

.file-card::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(circle at 50% 0%, rgba(var(--accent-rgb), 0.12), transparent 70%);
    opacity: 0;
    transition: opacity 0.5s;
    z-index: -1;
    pointer-events: none;
}

.file-card.file-type-card::after {
    background: radial-gradient(circle at 50% 0%, rgba(var(--accent-2-rgb), 0.12), transparent 70%);
}

.file-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0;
    transform: scaleX(0.5);
    transition: all 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.file-card.folder-type::before {
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

.file-card.file-type-card::before {
    background: linear-gradient(90deg, transparent, var(--accent-2), transparent);
}

.file-card:hover {
    transform: translateY(-6px);
    border-color: rgba(var(--accent-rgb), 0.4);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), 0 0 20px rgba(var(--accent-rgb), 0.15);
}

:root[data-theme='soft'] .file-card:hover {
    box-shadow: 0 15px 35px rgba(15, 23, 42, 0.08), 0 0 15px rgba(var(--accent-rgb), 0.1);
}

.file-card.file-type-card:hover {
    border-color: rgba(var(--accent-2-rgb), 0.4);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), 0 0 20px rgba(var(--accent-2-rgb), 0.15);
}

:root[data-theme='soft'] .file-card.file-type-card:hover {
    box-shadow: 0 15px 35px rgba(15, 23, 42, 0.08), 0 0 15px rgba(var(--accent-2-rgb), 0.1);
}

.file-card:hover::before {
    opacity: 1;
    transform: scaleX(1);
}

.file-card:hover::after {
    opacity: 1;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
}

.icon-wrapper {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.15), rgba(var(--accent-rgb), 0.05));
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    border: 1px solid rgba(var(--accent-rgb), 0.2);
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: inset 0 2px 10px rgba(255, 255, 255, 0.05);
}

.file-card.file-type-card .icon-wrapper {
    background: linear-gradient(135deg, rgba(var(--accent-2-rgb), 0.15), rgba(var(--accent-2-rgb), 0.05));
    color: var(--accent-2);
    border: 1px solid rgba(var(--accent-2-rgb), 0.2);
}

.file-card:hover .icon-wrapper {
    transform: scale(1.15) rotate(-5deg);
    background: linear-gradient(135deg, var(--accent), rgba(var(--accent-rgb), 0.8));
    color: #fff;
    border-color: var(--accent);
    box-shadow: 0 8px 20px rgba(var(--accent-rgb), 0.4);
}

.file-card.file-type-card:hover .icon-wrapper {
    background: linear-gradient(135deg, var(--accent-2), rgba(var(--accent-2-rgb), 0.8));
    border-color: var(--accent-2);
    box-shadow: 0 8px 20px rgba(var(--accent-2-rgb), 0.4);
}

.file-badge {
    padding: 0.35rem 0.65rem;
    border-radius: 8px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    transition: all 0.3s ease;
}

.badge-folder {
    background: rgba(var(--accent-rgb), 0.1);
    color: var(--accent);
    border: 1px solid rgba(var(--accent-rgb), 0.2);
}

.badge-file {
    background: rgba(var(--accent-2-rgb), 0.1);
    color: var(--accent-2);
    border: 1px solid rgba(var(--accent-2-rgb), 0.2);
}

.file-card:hover .badge-folder {
    background: rgba(var(--accent-rgb), 0.2);
    border-color: rgba(var(--accent-rgb), 0.4);
}

.file-card.file-type-card:hover .badge-file {
    background: rgba(var(--accent-2-rgb), 0.2);
    border-color: rgba(var(--accent-2-rgb), 0.4);
}

.file-name {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 1rem;
    line-height: 1.5;
    word-break: break-word;
    flex-grow: 1;
    transition: color 0.3s ease;
}

.file-card:hover .file-name {
    color: var(--accent);
}

.file-card.file-type-card:hover .file-name {
    color: var(--accent-2);
}

.file-meta {
    border-top: 1px dashed rgba(255, 255, 255, 0.1);
    padding-top: 1rem;
    font-size: 0.85rem;
    color: var(--muted);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.4rem;
    transition: all 0.3s ease;
}

:root[data-theme='soft'] .file-meta {
    border-top: 1px dashed rgba(15, 23, 42, 0.1);
}

.file-card:hover .file-meta {
    color: var(--text-light);
    border-top-color: rgba(var(--accent-rgb), 0.3);
}

.file-card.file-type-card:hover .file-meta {
    border-top-color: rgba(var(--accent-2-rgb), 0.3);
}

.file-type {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-weight: 500;
}

.file-meta i {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.file-card:hover .file-meta i {
    transform: translateX(4px);
    color: var(--accent);
}

.file-card.file-type-card:hover .file-meta i {
    transform: translateY(3px);
    color: var(--accent-2);
}

/* Scrollbars for file grid */
.file-grid::-webkit-scrollbar {
    width: 8px;
}

.file-grid::-webkit-scrollbar-track {
    background: transparent;
}

.file-grid::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 99px;
}

.file-grid::-webkit-scrollbar-thumb:hover {
    background: var(--muted);
}

/* Loading, Error and Empty States */
.loading-state,
.error-container,
.empty-state {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 5rem 2rem;
    text-align: center;
    color: var(--muted);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.error-icon,
.empty-state i {
    font-size: 3rem;
    color: var(--accent-2);
    margin-bottom: 1rem;
}

.error-container h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.5rem;
}

.retry-btn {
    margin-top: 1.25rem;
    padding: 0.6rem 1.25rem;
    background: var(--accent);
    color: #ffffff;
    border: none;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.retry-btn:hover {
    box-shadow: 0 4px 15px rgba(var(--accent-rgb), 0.35);
}

/* Responsive adjustments */
@media (max-width: 900px) {
    .explorer-header {
        padding: 1.5rem;
        gap: 1.5rem;
    }

    .file-grid {
        padding: 1.5rem;
        gap: 1rem;
    }
}

@media (max-width: 768px) {
    body {
        flex-direction: column;
    }

    aside.sidebar {
        width: 100%;
        height: auto;
        flex-direction: row;
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding: 0.75rem 1.25rem;
        align-items: center;
        justify-content: space-between;
    }

    .sidebar-top {
        flex-direction: row;
        align-items: center;
        width: auto;
        gap: 1rem;
    }

    .sidebar-nav {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        flex-direction: row;
        justify-content: space-around;
        background: var(--glass);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-top: 1px solid var(--border);
        padding: 0.5rem 0.5rem calc(0.5rem + env(safe-area-inset-bottom));
        gap: 0.25rem;
        z-index: 1000;
        box-shadow: 0 -4px 25px rgba(0, 0, 0, 0.15);
    }
    
    :root[data-theme='soft'] .sidebar-nav {
        background: rgba(255, 255, 255, 0.95);
    }

    .nav-item {
        flex-direction: column;
        padding: 0.5rem 0.25rem;
        font-size: 0.7rem;
        border: none;
        border-radius: 8px;
        gap: 0.35rem;
        flex: 1;
        justify-content: center;
        text-align: center;
    }

    .nav-item i {
        font-size: 1.4rem;
        margin: 0;
    }

    .sidebar-bottom {
        display: flex;
        padding-top: 0;
        border-top: none;
        width: auto;
        gap: 0.5rem;
    }

    .back-btn {
        flex: 0 0 auto;
        padding: 0.5rem;
        border-radius: 10px;
    }

    .back-btn span {
        display: none;
    }
    
    .theme-toggle {
        width: 36px;
        height: 36px;
    }

    .explorer-main {
        flex: 1;
        height: 0;
    }

    .file-grid {
        padding-bottom: calc(90px + env(safe-area-inset-bottom));
    }
}

@media (max-width: 640px) {
    aside.sidebar {
        padding: 0.75rem 1rem;
    }

    .brand span {
        display: none;
    }

    .explorer-header {
        flex-direction: column;
        align-items: stretch;
        padding: 1rem;
        gap: 1rem;
    }

    .header-path {
        max-width: 100%;
    }

    .search-wrapper {
        width: 100%;
    }

    .file-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }

    .file-card {
        min-height: 140px;
        padding: 1rem;
    }

    .icon-wrapper {
        width: 38px;
        height: 38px;
        font-size: 1.2rem;
    }

    .file-name {
        font-size: 0.88rem;
        margin-bottom: 0.5rem;
    }
}

/* ==========================================================================
   App Download Promo
   ========================================================================== */
.promo-and-ad-wrapper {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    align-items: flex-end;
    gap: 1rem;
    z-index: 100;
}

.adsense-container {
    background: var(--glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.5rem;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: center;
}

.app-download-promo {
    background: var(--glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.85rem;
    box-shadow: var(--shadow);
    text-decoration: none;
    color: var(--text);
    transition: var(--transition);
    width: 200px;
}

.app-download-promo:hover {
    transform: translateY(-5px);
    border-color: var(--accent);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4), 0 0 20px rgba(var(--accent-rgb), 0.2);
}

:root[data-theme='soft'] .app-download-promo:hover {
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.1), 0 0 15px rgba(var(--accent-rgb), 0.15);
}

.qr-img-wrapper {
    background: #ffffff;
    padding: 0.5rem;
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.05);
    transition: var(--transition);
}

.app-download-promo:hover .qr-img-wrapper {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(var(--accent-rgb), 0.2);
}

.qr-img {
    width: 150px;
    height: 150px;
    object-fit: contain;
    border-radius: 4px;
}

.promo-text {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.promo-text strong {
    font-size: 1rem;
    color: var(--text);
    font-weight: 700;
}

.promo-text span {
    font-size: 0.75rem;
    color: var(--text-light);
    line-height: 1.3;
    margin-top: 0.25rem;
}

@media (max-width: 768px) {
    .promo-and-ad-wrapper {
        bottom: calc(85px + env(safe-area-inset-bottom));
        right: 1.5rem;
        flex-direction: column;
        align-items: flex-end;
    }
    
    .app-download-promo {
        padding: 1rem;
        width: 160px;
        gap: 0.65rem;
    }
    
    .promo-text strong {
        font-size: 0.9rem;
    }
    
    .promo-text span {
        font-size: 0.65rem;
    }
    
    .qr-img {
        width: 120px;
        height: 120px;
    }
}

@media (max-width: 640px) {
    .promo-and-ad-wrapper {
        display: none;
    }
}