:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-hover: #334155;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: var(--text);
    min-height: 100vh;
}

.app-container {
    max-width: 1400px;
    margin: 0 auto;
}

/* Header */
.header {
    background: rgba(30, 41, 59, 0.8);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo-small {
    height: 32px;
    width: auto;
}

.header h1 {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

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

.username {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

.logout-btn {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all 0.2s;
}

.logout-btn:hover {
    background: var(--danger);
    color: white;
    transform: translateY(-1px);
}

/* Login Screen */
.login-screen {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 2rem;
    background: radial-gradient(circle at top right, #1e1b4b, #0f172a);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

.login-card {
    background: rgba(30, 41, 59, 0.7);
    padding: 3rem;
    border-radius: 1.5rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    width: 100%;
    max-width: 420px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
}

.login-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.logo-large {
    height: 80px;
    width: auto;
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 0 20px rgba(99, 102, 241, 0.3));
}

.login-card h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: white;
}

.login-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.input-group {
    margin-bottom: 1.25rem;
}

.login-card input {
    width: 100%;
    padding: 0.875rem 1rem;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    color: white;
    font-size: 1rem;
    transition: all 0.2s;
}

.login-card input:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(15, 23, 42, 0.8);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

.login-card button {
    width: 100%;
    padding: 0.875rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    border-radius: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    margin-top: 0.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.login-card button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.3);
}

.error-message {
    color: #f87171;
    font-size: 0.875rem;
    margin-top: 1rem;
    text-align: center;
    min-height: 1.25rem;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 0.5rem;
    padding: 1.5rem 2rem 0;
    overflow-x: auto;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background: transparent;
    color: var(--text-muted);
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.2s;
    white-space: nowrap;
}

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

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* Tab Content */
.tab-content {
    padding: 2rem;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

/* Controls */
.controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.controls input,
.controls select {
    padding: 0.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    color: var(--text);
    font-size: 0.95rem;
}

.controls input {
    flex: 1;
    min-width: 200px;
}

.controls select {
    min-width: 150px;
}

/* Stats Bar */
.stats-bar {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.stat-card {
    background: var(--bg-card);
    padding: 1rem 1.5rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border);
}

.stat-card h3 {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.stat-card p {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

/* Items Grid */
.items-grid {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.category-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.5rem;
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.category-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary);
    margin: 0;
}

.category-count {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.category-items {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.item-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.5rem;
    transition: all 0.2s;
}

.item-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.1);
}

.item-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1rem;
}

.item-name {
    font-size: 1.125rem;
    font-weight: 600;
}

.quantity-badge {
    background: var(--primary);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
}

.item-details {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.item-detail {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Docs Grid */
.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
}

.doc-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.doc-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    background: var(--bg-hover);
}

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

.doc-info {
    width: 100%;
}

.doc-name {
    font-weight: 600;
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.doc-meta {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.icon-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
}

.icon-btn:hover {
    background: var(--bg-hover);
    border-color: var(--primary);
}

.spacer {
    flex: 1;
}

/* Checkouts List */
.checkouts-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.checkout-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.5rem;
    transition: all 0.2s;
}

.checkout-card.returned {
    opacity: 0.8;
}

.checkout-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.checkout-item-name {
    font-size: 1.125rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.checkout-status {
    font-size: 0.875rem;
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    text-transform: uppercase;
}

.checkout-status.CHECKED_OUT {
    background: var(--warning);
    color: white;
}

.checkout-status.RETURNED {
    background: var(--secondary);
    color: white;
}

.checkout-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.checkout-row {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    font-size: 0.9rem;
}

.checkout-row span:first-child {
    color: var(--text-muted);
}

.checkout-note {
    grid-column: 1 / -1;
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px dashed var(--border);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Toggle Buttons */
.toggle-group {
    display: flex;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 0.25rem;
    gap: 0.25rem;
}

.toggle-btn {
    padding: 0.5rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-muted);
    border-radius: 0.25rem;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
}

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

.toggle-btn:hover:not(.active) {
    color: var(--text);
    background: var(--bg-hover);
}

/* Users List */
.users-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.user-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.5rem;
}

.user-name {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.user-role {
    display: inline-block;
    font-size: 0.75rem;
    padding: 0.125rem 0.5rem;
    border-radius: 9999px;
    background: var(--bg-hover);
    color: var(--text-muted);
}

.user-role.ADMIN {
    background: var(--danger);
    color: white;
}

.user-role.MANAGER {
    background: var(--warning);
    color: white;
}

.user-email {
    margin-top: 0.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Loading */
.loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        padding: 1rem;
    }

    .tabs {
        padding: 1rem 1rem 0;
    }

    .tab-content {
        padding: 1rem;
    }

    .items-grid,
    .users-list,
    .docs-grid {
        grid-template-columns: 1fr;
    }

    .checkout-details {
        grid-template-columns: 1fr;
    }
}

/* Dashboard Home */
.dashboard-hero {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 1rem;
    padding: 2.5rem;
    color: white;
    margin-bottom: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
    box-shadow: 0 10px 30px rgba(79, 70, 229, 0.3);
}

.hero-content h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.hero-content p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.1rem;
}

.hero-stats {
    display: flex;
    gap: 1.5rem;
}

.hero-stat-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 1rem 1.5rem;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    min-width: 160px;
}

.stat-icon {
    font-size: 2rem;
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.2;
}

.stat-label {
    font-size: 0.75rem;
    opacity: 0.9;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.dashboard-section h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 1rem;
}

.action-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text);
}

.action-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    background: var(--bg-hover);
}

.action-icon {
    font-size: 2rem;
}

.action-text {
    font-weight: 500;
    font-size: 0.9rem;
}

.activity-list {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1rem;
}

.activity-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    background: var(--bg-hover);
}

.activity-icon.CHECKED_OUT {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.activity-icon.RETURNED {
    background: rgba(16, 185, 129, 0.1);
    color: var(--secondary);
}

.activity-details {
    flex: 1;
}

.activity-text {
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.activity-time {
    font-size: 0.75rem;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .dashboard-hero {
        flex-direction: column;
        align-items: flex-start;
    }

    .hero-stats {
        width: 100%;
        overflow-x: auto;
        padding-bottom: 0.5rem;
    }
}