:root {
    /* Google / Gmail Inspired Colors */
    --bg-color: #F8F9FA;
    --surface-color: #FFFFFF;
    --border-color: #DADCE0;
    --text-primary: #202124;
    --text-secondary: #5F6368;
    --primary-color: #1A73E8;
    --primary-hover: #185ABC;
    --primary-light: #E8F0FE;
    --danger-color: #D93025;
    --success-color: #188038;
    --warning-color: #F29900;
    
    /* Shift Colors */
    --shift-barista: #E8F0FE;
    --shift-barista-text: #1967D2;
    --shift-manager: #FCE8E6;
    --shift-manager-text: #C5221F;
    --shift-kitchen: #E6F4EA;
    --shift-kitchen-text: #137333;
    --shift-cashier: #FEF7E0;
    --shift-cashier-text: #E37400;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    height: 100vh;
    overflow: hidden;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header */
.app-header {
    height: 64px;
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    flex-shrink: 0;
}

.header-left, .header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.menu-icon {
    color: var(--text-secondary);
    cursor: pointer;
    padding: 12px;
    border-radius: 50%;
    transition: background-color 0.2s;
}

.menu-icon:hover, .icon-btn:hover {
    background-color: rgba(60,64,67,0.08);
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 20px;
    font-weight: 500;
    color: var(--text-secondary);
}

.logo-icon {
    color: var(--primary-color);
}

.icon-btn {
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background-color 0.2s;
}

.avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
    cursor: pointer;
}

/* Main Content */
.main-content {
    flex: 1;
    position: relative;
    overflow: hidden;
}

.view-section {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s;
    display: flex;
}

.view-section.active {
    opacity: 1;
    visibility: visible;
}

/* Upload View */
.upload-container {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-color);
}

.upload-card {
    background-color: var(--surface-color);
    border-radius: 12px;
    padding: 48px;
    width: 100%;
    max-width: 600px;
    text-align: center;
    box-shadow: 0 1px 2px 0 rgba(60,64,67,0.3), 0 1px 3px 1px rgba(60,64,67,0.15);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.upload-icon-wrapper {
    background-color: var(--primary-light);
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
}

.upload-icon {
    font-size: 32px;
    color: var(--primary-color);
}

.upload-card h2 {
    font-size: 24px;
    font-weight: 400;
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.upload-dropzone {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 48px 24px;
    margin-bottom: 32px;
    background-color: #FAFAFA;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}

.upload-dropzone:hover {
    background-color: var(--primary-light);
    border-color: var(--primary-color);
}

.drop-icon {
    font-size: 48px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.drop-hint {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 4px;
}

.upload-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.divider {
    color: var(--text-secondary);
    font-size: 14px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: 24px; /* Pill shape like Google */
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    border: none;
    transition: background-color 0.2s, box-shadow 0.2s;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 1px 2px 0 rgba(60,64,67,0.3), 0 1px 3px 1px rgba(60,64,67,0.15);
}

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

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

/* Data Preview Table */
.data-preview {
    position: relative;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 24px;
    overflow: hidden;
    max-height: 200px;
}

.preview-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    text-align: left;
}

.preview-table th, .preview-table td {
    padding: 8px 16px;
    border-bottom: 1px solid var(--border-color);
}

.preview-table th {
    background-color: #F8F9FA;
    color: var(--text-secondary);
    font-weight: 500;
}

.fade-out-bottom {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 60px;
    background: linear-gradient(to bottom, transparent, var(--surface-color));
}

/* Processing State */
.processing-state {
    display: none;
    flex-direction: column;
    align-items: center;
    background-color: var(--surface-color);
    padding: 48px;
    border-radius: 12px;
    box-shadow: 0 1px 2px 0 rgba(60,64,67,0.3), 0 1px 3px 1px rgba(60,64,67,0.15);
    width: 400px;
    text-align: center;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--primary-light);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 24px;
}

.progress-bar-container {
    width: 100%;
    height: 4px;
    background-color: var(--primary-light);
    border-radius: 2px;
    margin-top: 24px;
    overflow: hidden;
}

.progress-bar {
    width: 0%;
    height: 100%;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Dashboard Layout */
.dashboard-layout {
    display: flex;
    width: 100%;
    height: 100%;
}

.sidebar {
    width: 256px;
    background-color: var(--surface-color);
    border-right: 1px solid var(--border-color);
    padding: 16px 0;
    flex-shrink: 0;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 24px;
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    border-radius: 0 24px 24px 0;
    margin-right: 16px;
    transition: background-color 0.2s, color 0.2s;
}

.nav-item:hover {
    background-color: rgba(60,64,67,0.08);
}

.nav-item.active {
    background-color: var(--primary-light);
    color: var(--primary-color);
}

.nav-item.active .material-icons {
    color: var(--primary-color);
}

.divider-nav {
    height: 1px;
    background-color: var(--border-color);
    margin: 8px 0;
    padding: 0;
    border-radius: 0;
}

/* Schedule Area */
.schedule-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 24px;
    overflow: hidden;
}

.schedule-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.date-navigator {
    display: flex;
    align-items: center;
    gap: 16px;
}

.date-navigator h3 {
    font-size: 22px;
    font-weight: 400;
    color: var(--text-primary);
}

.calendar-wrapper {
    flex: 1;
    background-color: var(--surface-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    overflow: auto;
    box-shadow: 0 1px 2px 0 rgba(60,64,67,0.3);
}

.calendar-grid {
    min-width: 900px;
}

.grid-header {
    display: grid;
    grid-template-columns: 180px repeat(7, 1fr);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--surface-color);
    position: sticky;
    top: 0;
    z-index: 10;
}

.header-cell {
    padding: 12px;
    text-align: center;
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 13px;
    border-right: 1px solid var(--border-color);
}
.header-cell:last-child {
    border-right: none;
}

.empty-cell {
    text-align: left;
    padding-left: 24px;
}

.employee-row {
    display: grid;
    grid-template-columns: 180px repeat(7, 1fr);
    border-bottom: 1px solid var(--border-color);
}

.employee-row:last-child {
    border-bottom: none;
}

.employee-info {
    padding: 16px 24px;
    border-right: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 12px;
}

.employee-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: var(--text-secondary);
}

.employee-details {
    display: flex;
    flex-direction: column;
}

.employee-name {
    font-size: 14px;
    font-weight: 500;
}

.employee-role {
    font-size: 12px;
    color: var(--text-secondary);
}

.day-cell {
    padding: 8px;
    border-right: 1px solid var(--border-color);
    position: relative;
    min-height: 80px;
    transition: background-color 0.2s;
}

.day-cell:last-child {
    border-right: none;
}

.day-cell:hover {
    background-color: var(--bg-color);
}

/* Shifts */
.shift-card {
    border-radius: 4px;
    padding: 8px;
    font-size: 12px;
    margin-bottom: 4px;
    cursor: pointer;
    transition: transform 0.1s;
    border-left: 3px solid transparent;
}

.shift-card:hover {
    transform: translateY(-1px);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.shift-time {
    font-weight: 600;
    margin-bottom: 2px;
}

.shift-role {
    font-size: 11px;
    opacity: 0.9;
}

/* Color variations */
.role-barista {
    background-color: var(--shift-barista);
    color: var(--shift-barista-text);
    border-left-color: var(--primary-color);
}
.role-manager {
    background-color: var(--shift-manager);
    color: var(--shift-manager-text);
    border-left-color: var(--danger-color);
}
.role-kitchen {
    background-color: var(--shift-kitchen);
    color: var(--shift-kitchen-text);
    border-left-color: var(--success-color);
}
.role-cashier {
    background-color: var(--shift-cashier);
    color: var(--shift-cashier-text);
    border-left-color: var(--warning-color);
}

.employee-avatar.barista { background-color: var(--shift-barista); color: var(--shift-barista-text); }
.employee-avatar.manager { background-color: var(--shift-manager); color: var(--shift-manager-text); }
.employee-avatar.kitchen { background-color: var(--shift-kitchen); color: var(--shift-kitchen-text); }
.employee-avatar.cashier { background-color: var(--shift-cashier); color: var(--shift-cashier-text); }

/* Animations */
@keyframes slideUpFade {
    0% {
        opacity: 0;
        transform: translateY(10px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.stagger-in {
    animation: slideUpFade 0.4s ease forwards;
    opacity: 0;
}

/* Employees Area */
.employees-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 24px;
    overflow: hidden;
}

.employees-list-wrapper {
    flex: 1;
    background-color: var(--surface-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    overflow: auto;
    box-shadow: 0 1px 2px 0 rgba(60,64,67,0.3);
    padding: 24px;
}

.employees-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.employee-card {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
}

.employee-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.employee-card .employee-avatar {
    width: 64px;
    height: 64px;
    font-size: 24px;
    margin-bottom: 16px;
}

.employee-card .employee-name {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 4px;
}

.employee-card .employee-role {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.employee-stats {
    display: flex;
    justify-content: space-between;
    width: 100%;
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
}

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

.stat-value {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.stat-label {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Analytics Area */
.analytics-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 24px;
    overflow: auto;
}

.analytics-content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.analytics-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 24px;
    box-shadow: 0 1px 2px 0 rgba(60,64,67,0.3);
}

.analytics-card .stat-title {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 8px;
}

.analytics-card .stat-number {
    font-size: 32px;
    font-weight: 400;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.stat-trend {
    display: flex;
    align-items: center;
    font-size: 13px;
    font-weight: 500;
}

.stat-trend .material-icons {
    font-size: 16px;
    margin-right: 4px;
}

.stat-trend.positive { color: var(--success-color); }
.stat-trend.negative { color: var(--danger-color); }
.stat-trend.neutral { color: var(--text-secondary); }

.charts-row {
    display: flex;
    gap: 24px;
}

.chart-card {
    flex: 1;
}

.chart-bars {
    margin-top: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.chart-bar-wrap {
    display: flex;
    align-items: center;
    gap: 16px;
}

.bar-label {
    width: 80px;
    font-size: 14px;
    color: var(--text-secondary);
}

.bar-track {
    flex: 1;
    height: 12px;
    background-color: var(--border-color);
    border-radius: 6px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    border-radius: 6px;
    transition: width 1s ease;
}

.bar-val {
    width: 40px;
    text-align: right;
    font-size: 14px;
    font-weight: 500;
}

/* Top Contributors */
.top-contributors {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 24px;
}

.contributor-row {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--surface-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

.contributor-row:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.contributor-row .employee-avatar {
    width: 40px;
    height: 40px;
    font-size: 14px;
    flex-shrink: 0;
}

.contributor-info {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.contributor-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.contributor-role {
    font-size: 12px;
    color: var(--text-secondary);
}

.contributor-hours {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary-color);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}
.modal {
    background: var(--surface-color);
    border-radius: 8px;
    width: 400px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.2);
    display: flex;
    flex-direction: column;
}
.modal-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.modal-close {
    cursor: pointer;
    color: var(--text-secondary);
}
.modal-body {
    padding: 24px;
}
.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 16px;
}
.form-group label {
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}
.form-group select, .form-group input {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 14px;
    background-color: var(--surface-color);
    color: var(--text-primary);
}
.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* Empty State Background for Day Cells */
.day-cell:empty {
    background-image: radial-gradient(rgba(0,0,0,0.06) 1px, transparent 1px);
    background-size: 12px 12px;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 2000;
}
.toast {
    background: var(--surface-color);
    color: var(--text-primary);
    padding: 12px 24px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    border-left: 4px solid var(--primary-color);
    display: flex;
    align-items: center;
    gap: 12px;
    transform: translateX(120%);
    animation: slideInRight 0.3s forwards;
    font-size: 14px;
    font-weight: 500;
}
.toast.hide {
    animation: slideOutRight 0.3s forwards;
}
@keyframes slideInRight {
    to { transform: translateX(0); }
}
@keyframes slideOutRight {
    to { transform: translateX(120%); }
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .dashboard-layout {
        flex-direction: column;
    }
    .sidebar {
        position: fixed;
        left: -240px;
        top: 60px;
        height: calc(100vh - 60px);
        z-index: 1000;
        transition: left 0.3s ease;
        box-shadow: 2px 0 8px rgba(0,0,0,0.1);
    }
    .sidebar.open {
        left: 0;
    }
    .stats-row, .charts-row {
        flex-direction: column;
    }
    .grid-header {
        grid-template-columns: 100px repeat(7, minmax(100px, 1fr));
    }
    .employee-row {
        grid-template-columns: 100px repeat(7, minmax(100px, 1fr));
    }
    .employee-info {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: 8px 4px;
    }
    .employee-details {
        margin-left: 0;
        margin-top: 4px;
    }
    .employee-name {
        font-size: 12px;
    }
}

/* Conflict Detection */
.shift-card.conflict {
    border: 2px solid #E53935;
    background-color: #ffebee;
    position: relative;
}
.shift-card.conflict .shift-time,
.shift-card.conflict .shift-role {
    color: #b71c1c;
}
.conflict-icon {
    position: absolute;
    top: -8px;
    right: -8px;
    background: #E53935;
    color: white;
    border-radius: 50%;
    font-size: 14px;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

/* Drag and Drop States */
.shift-card {
    cursor: grab;
}
.shift-card:active {
    cursor: grabbing;
}
.shift-card.dragging {
    opacity: 0.5;
    transform: scale(0.95);
}
.day-cell.drag-over {
    background-color: rgba(66, 133, 244, 0.1);
    border: 2px dashed var(--primary-color);
}