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

:root {
    --primary-color: #4285F4;
    --secondary-color: #34A853;
    --accent-color: #FBBC04;
    --danger-color: #EA4335;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --border-color: #dadce0;
    --background: #ffffff;
    --background-secondary: #f8f9fa;
    --hover-bg: #f1f3f4;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text-primary);
    background-color: var(--background);
    line-height: 1.6;
}

/* Navigation */
.navbar {
    background: white;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--primary-color);
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-outline, .btn-hero {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background: #3367d6;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(66, 133, 244, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--hover-bg);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

.btn-hero {
    background: var(--primary-color);
    color: white;
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-hero:hover {
    background: #3367d6;
    transform: scale(1.05);
    box-shadow: 0 8px 16px rgba(66, 133, 244, 0.4);
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* Hero Section */
.hero {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.hero-image {
    display: flex;
    justify-content: center;
}

/* Features */
.features {
    background: var(--background-secondary);
    padding: 4rem 2rem;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

.feature-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
}

/* About */
.about {
    max-width: 800px;
    margin: 0 auto;
    padding: 4rem 2rem;
    text-align: center;
}

.about h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.about p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    text-align: center;
    padding: 2rem;
}

/* Dashboard */
.dashboard {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.dashboard-nav {
    border-bottom: 1px solid var(--border-color);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.dashboard-container {
    display: grid;
    grid-template-columns: 250px 1fr;
    flex: 1;
}

/* Sidebar */
.sidebar {
    background: var(--background-secondary);
    padding: 2rem 1rem;
    border-right: 1px solid var(--border-color);
}

.sidebar-section {
    margin-top: 2rem;
}

.sidebar-section h3 {
    font-size: 0.875rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.breadcrumb {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.storage-stats {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.stat-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.stat-label {
    color: var(--text-secondary);
}

.stat-item:last-child {
    margin-bottom: 0;
    font-weight: 600;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border-color);
}

/* Main Content */
.main-content {
    padding: 2rem;
}

.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.view-options {
    color: var(--text-secondary);
}

/* Drop Zone */
.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 3rem;
    text-align: center;
    margin-bottom: 2rem;
    transition: all 0.2s;
}

.drop-zone.drag-over {
    border-color: var(--primary-color);
    background: #e8f0fe;
}

.drop-zone p {
    margin-top: 1rem;
    color: var(--text-secondary);
}

.drop-zone-hint {
    font-size: 0.875rem;
}

/* File Grid */
.file-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1.5rem;
}

.file-item, .folder-item {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.file-item:hover, .folder-item:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.file-icon, .folder-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.file-name {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    word-break: break-word;
}

.file-size {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.file-actions {
    margin-top: 0.5rem;
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}

.btn-small {
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background: white;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-small:hover {
    background: var(--hover-bg);
}

.btn-danger {
    color: var(--danger-color);
    border-color: var(--danger-color);
}

.btn-danger:hover {
    background: var(--danger-color);
    color: white;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-state svg {
    margin-bottom: 1rem;
}

.empty-state h3 {
    margin-bottom: 0.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero {
        grid-template-columns: 1fr;
    }

    .hero-image {
        order: -1;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .dashboard-container {
        grid-template-columns: 1fr;
    }

    .sidebar {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .file-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
}