:root {
    --bg-primary: #0a0d14;
    --bg-secondary: #111726;
    --bg-card: rgba(18, 26, 43, 0.75);
    --bg-glass: rgba(23, 33, 54, 0.55);
    --border-color: rgba(66, 153, 225, 0.2);
    --border-glow: rgba(0, 240, 255, 0.4);
    --accent-cyan: #00f0ff;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-emerald: #10b981;
    --accent-rose: #f43f5e;
    --accent-amber: #f59e0b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-dim: #64748b;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
    background-color: var(--bg-primary);
    background-image: 
        radial-gradient(at 0% 0%, rgba(0, 240, 255, 0.08) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(139, 92, 246, 0.08) 0px, transparent 50%),
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 100% 100%, 100% 100%, 32px 32px, 32px 32px;
    color: var(--text-main);
    font-family: var(--font-sans);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Glassmorphism utility */
.glass-panel {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

/* Header Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border-color);
    background: rgba(10, 13, 20, 0.8);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
}

.brand-icon {
    font-size: 1.6rem;
    color: var(--accent-cyan);
    filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.6));
}

.badge-security {
    font-size: 0.75rem;
    padding: 0.2rem 0.6rem;
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-emerald);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: 9999px;
    font-family: var(--font-mono);
    text-transform: uppercase;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Main Container */
.main-container {
    max-width: 1280px;
    width: 100%;
    margin: 2rem auto;
    padding: 0 1.5rem;
    flex: 1;
}

/* Auth / Lock Screen */
.auth-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
}

.auth-card {
    max-width: 480px;
    width: 100%;
    padding: 2.5rem;
    text-align: center;
}

.auth-shield {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    display: inline-block;
    filter: drop-shadow(0 0 16px rgba(0, 240, 255, 0.5));
    animation: float 4s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
}

/* Forms & Inputs */
.form-group {
    margin-bottom: 1.25rem;
    text-align: left;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-input, .form-textarea, .form-select {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
    outline: none;
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.2);
}

.form-mono {
    font-family: var(--font-mono);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
    color: #030712;
    box-shadow: 0 4px 14px rgba(0, 240, 255, 0.35);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(0, 240, 255, 0.5);
}

.btn-secondary {
    background: rgba(30, 41, 59, 0.8);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(51, 65, 85, 0.8);
    border-color: var(--accent-cyan);
}

.btn-danger {
    background: rgba(244, 63, 94, 0.15);
    color: var(--accent-rose);
    border: 1px solid rgba(244, 63, 94, 0.3);
}

.btn-danger:hover {
    background: rgba(244, 63, 94, 0.3);
}

.btn-sm {
    padding: 0.4rem 0.75rem;
    font-size: 0.82rem;
}

.btn-block {
    width: 100%;
}

/* App Grid Layout (Sidebar + Content) */
.vault-layout {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 1.5rem;
}

/* Sidebar */
.vault-sidebar {
    padding: 1.5rem;
    height: calc(100vh - 120px);
    position: sticky;
    top: 90px;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.category-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.category-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.65rem 0.9rem;
    border-radius: 8px;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
}

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

.category-item.active {
    background: rgba(0, 240, 255, 0.12);
    color: var(--accent-cyan);
    border-left: 3px solid var(--accent-cyan);
    font-weight: 600;
}

.category-badge {
    background: rgba(255, 255, 255, 0.1);
    padding: 0.15rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-family: var(--font-mono);
}

/* Search and Toolbar */
.vault-toolbar {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    align-items: center;
}

.search-box {
    flex: 1;
    position: relative;
}

.search-box input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-main);
}

.search-icon {
    position: absolute;
    left: 0.9rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-dim);
}

/* Vault Items Grid */
.items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.25rem;
}

.vault-item-card {
    padding: 1.25rem;
    transition: all 0.2s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.vault-item-card:hover {
    transform: translateY(-3px);
    border-color: var(--border-glow);
    box-shadow: 0 10px 25px -5px rgba(0, 240, 255, 0.15);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
}

.card-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-main);
}

.card-category {
    font-size: 0.72rem;
    text-transform: uppercase;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: var(--font-mono);
}

.cat-login { background: rgba(59, 130, 246, 0.15); color: #60a5fa; }
.cat-note { background: rgba(139, 92, 246, 0.15); color: #a78bfa; }
.cat-card { background: rgba(16, 185, 129, 0.15); color: #34d399; }
.cat-key { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }
.cat-file { background: rgba(236, 72, 153, 0.15); color: #f472b6; }

/* File Drop Zone */
.file-dropzone {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    background: rgba(15, 23, 42, 0.4);
    cursor: pointer;
    transition: all 0.2s ease;
    margin-bottom: 1.25rem;
}

.file-dropzone:hover, .file-dropzone.dragover {
    border-color: var(--accent-cyan);
    background: rgba(0, 240, 255, 0.06);
}

.file-info-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.08);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    margin-top: 0.5rem;
}

.card-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.card-actions {
    display: flex;
    gap: 0.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 0.75rem;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    padding: 1.5rem;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    max-width: 560px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    padding: 2rem;
}

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

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

/* Password Generator Bar */
.pw-generator {
    background: rgba(0, 0, 0, 0.3);
    padding: 1rem;
    border-radius: 8px;
    border: 1px dashed var(--border-color);
    margin-bottom: 1.25rem;
}

.pw-display {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--accent-cyan);
    margin-bottom: 0.75rem;
    word-break: break-all;
}

.pw-controls {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    z-index: 2000;
}

.toast {
    padding: 0.85rem 1.25rem;
    border-radius: 8px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    animation: slideIn 0.3s ease;
}

.toast-success { border-color: var(--accent-emerald); }
.toast-error { border-color: var(--accent-rose); }

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Responsive */
@media (max-width: 860px) {
    .vault-layout {
        grid-template-columns: 1fr;
    }
    .vault-sidebar {
        height: auto;
        position: static;
    }
}