:root {
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --danger: #ef4444;
    --success: #10b981;
    --input-bg: rgba(15, 23, 42, 0.6);
    --shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
}

body {
    background: var(--bg-gradient);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.login-body {
    justify-content: center;
    align-items: center;
    background: url('https://images.unsplash.com/photo-1557683316-973673baf926?q=80&w=2000&auto=format&fit=crop') center/cover no-repeat;
}

.login-body::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(15, 23, 42, 0.8);
    z-index: 1;
}

.glass-container {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: var(--shadow);
    padding: 2rem;
    z-index: 2;
}

.login-box {
    width: 100%;
    max-width: 400px;
    padding: 3rem 2rem;
    animation: fadeIn 0.5s ease-out;
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.login-header p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-muted);
}

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-main);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.btn-primary {
    width: 100%;
    padding: 0.875rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.error-text {
    color: var(--danger);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    text-align: center;
    min-height: 20px;
}

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

/* Dashboard Layout */
.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

.sidebar {
    width: 280px;
    background: var(--glass-bg);
    border-right: 1px solid var(--glass-border);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    background: linear-gradient(to right, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-item {
    padding: 0.75rem 1rem;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 8px;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.nav-item:hover, .nav-item.active {
    background: rgba(255,255,255,0.05);
    color: var(--text-main);
}

.user-profile {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--glass-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.main-content {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
    background: var(--bg-gradient);
}

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

.page-title {
    font-size: 1.8rem;
    font-weight: 600;
}

.action-buttons {
    display: flex;
    gap: 1rem;
}

/* Grids and Cards */
.folders-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.folder-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.folder-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
    border-color: var(--primary);
}

.folder-icon {
    font-size: 3rem;
    color: #60a5fa;
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: #1e293b;
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    width: 100%;
    max-width: 500px;
    padding: 2rem;
    box-shadow: var(--shadow);
    transform: translateY(20px);
    transition: all 0.3s ease;
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
}

.close-btn:hover {
    color: var(--text-main);
}

/* Responsive Overrides */
@media (max-width: 768px) {
    .app-container { flex-direction: column; }
    .sidebar {
        width: 100%; padding: 1rem; flex-direction: column; 
        align-items: stretch; border-right: none; 
        border-bottom: 1px solid var(--glass-border); flex: none; gap: 0;
    }
    .sidebar-header { margin-bottom: 0; font-size: 1.5rem; width: 100%; }
    .hamburger-btn { display: block !important; }
    
    .sidebar-nav { display: none; width: 100%; margin-top: 1rem; flex-direction: column; gap: 0.5rem; padding-bottom: 0; }
    .user-profile { display: none; border-top: 1px solid var(--glass-border); padding-top: 1rem; margin-top: 1rem; width: 100%; justify-content: space-between; }
    
    .sidebar.show-menu .sidebar-nav { display: flex; }
    .sidebar.show-menu .user-profile { display: flex; }
    .nav-item { margin-bottom: 0; white-space: nowrap; font-size: 0.9rem; padding: 0.5rem 0.8rem; }
    
    .main-content { padding: 1rem; }
    .top-bar { flex-direction: column; align-items: flex-start; gap: 1rem; margin-bottom: 1.5rem; }
    .action-buttons { width: 100%; display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem; }
    .action-buttons button { width: 100%; padding: 0.5rem; font-size: 0.85rem; justify-content: center; }
    
    .folders-grid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 1rem; }
    .file-card { padding: 0.75rem; gap: 0.75rem; }
    
    .modal-content { max-width: 95%; padding: 1.2rem; margin: 1rem; }
    .inline-editor-container { padding: 1rem !important; }
    .inline-editor-container > div:first-child { flex-direction: column; align-items: stretch !important; gap: 0.75rem !important; }
    #inlineNoteTitle { width: 100% !important; flex: none !important; margin-bottom: 0; }
    .inline-editor-container > div:first-child button { width: 100% !important; justify-content: center; }
    
    #drawingCanvas { width: 100% !important; height: auto !important; aspect-ratio: 7/4; }
}