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

:root {
    --primary: #6366f1;
    --primary-light: #818cf8;
    --secondary: #14b8a6;
    --danger: #ef4444;
    --success: #10b981;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--gray-50);
    color: var(--gray-900);
}

.app-shell {
    display: grid;
    grid-template-columns: 280px 1fr 320px;
    grid-template-rows: auto 1fr;
    min-height: 100vh;
    gap: 24px;
    padding: 24px;
}

/* ===== Sidebar ===== */
.sidebar {
    grid-row: 1 / -1;
    grid-column: 1;
    background: white;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 32px;
}

.brand-mark {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 18px;
}

.brand-name {
    font-weight: 600;
    color: var(--gray-900);
}

.brand-subtitle {
    font-size: 12px;
    color: var(--gray-500);
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
}

.nav-item {
    background: none;
    border: none;
    padding: 12px 16px;
    border-radius: 8px;
    text-align: left;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-600);
    transition: all 0.2s;
}

.nav-item:hover {
    background: var(--gray-100);
    color: var(--gray-900);
}

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

/* Connection Status Indicator */
.connection-status {
    margin-top: auto;
    padding: 12px;
    background: var(--gray-100);
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 500;
    color: var(--gray-700);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--danger);
    display: block;
    animation: pulse 2s infinite;
}

.status-dot[style*="rgb(16, 185, 129)"] {
    animation: pulse-success 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes pulse-success {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
    50% { opacity: 1; box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.1); }
}

/* ===== Main Content ===== */
.main-content {
    grid-column: 2;
}

.topbar {
    background: white;
    padding: 24px;
    border-radius: 12px;
    margin-bottom: 24px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.topbar h1 {
    font-size: 28px;
    margin-bottom: 4px;
}

.topbar-description {
    color: var(--gray-500);
    font-size: 14px;
}

.page-section {
    display: none;
}

.page-section.active {
    display: block;
}

.section-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

/* ===== Metric Cards ===== */
.metric-card {
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.metric-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

.metric-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.metric-footer {
    font-size: 12px;
    color: var(--gray-500);
}

/* ===== Content Grid ===== */
.content-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 24px;
}

.content-grid--wide {
    grid-template-columns: 1fr;
}

/* ===== Cards & Panels ===== */
.card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.panel {
    padding: 24px;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.panel-header h2 {
    font-size: 18px;
    font-weight: 600;
}

.chart-placeholder {
    background: var(--gray-50);
    padding: 20px;
    border-radius: 8px;
    color: var(--gray-600);
    font-size: 14px;
    line-height: 1.6;
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chart-placeholder div {
    display: block;
    margin: 8px 0;
}

/* ===== Table ===== */
.table-wrapper {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

thead {
    background: var(--gray-50);
}

th {
    text-align: left;
    padding: 12px 16px;
    font-size: 12px;
    font-weight: 600;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--gray-200);
}

td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--gray-200);
    font-size: 14px;
}

tbody tr:hover {
    background: var(--gray-50);
}

/* ===== Report Cards ===== */
.report-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 12px;
}

.report-card {
    padding: 20px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.2s;
}

.report-card:hover {
    transform: translateY(-4px);
}

/* ===== Forms ===== */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

label {
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-700);
}

select {
    padding: 8px 12px;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    font-size: 14px;
    background: white;
    cursor: pointer;
}

.primary-button,
.small-button {
    padding: 10px 16px;
    border: none;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

.primary-button:hover {
    background: var(--primary-light);
}

.small-button {
    background: var(--gray-200);
    color: var(--gray-900);
    font-size: 13px;
}

.small-button:hover {
    background: var(--gray-300);
}

/* ===== Settings ===== */
.settings-grid {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.setting-group {
    padding-bottom: 20px;
    border-bottom: 1px solid var(--gray-200);
}

.setting-group label {
    display: block;
    margin-bottom: 12px;
}

.setting-group .small-button {
    margin-right: 8px;
}

.color-palette {
    display: flex;
    gap: 12px;
}

.color-swatch {
    width: 40px;
    height: 40px;
    border-radius: 6px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s;
}

.color-swatch:hover {
    border-color: var(--gray-400);
}

/* ===== Right Panel ===== */
.right-panel {
    grid-column: 3;
    grid-row: 1 / -1;
}

.summary-card h2 {
    font-size: 16px;
    margin-bottom: 16px;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--gray-200);
    font-size: 14px;
}

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

.summary-item span {
    color: var(--gray-600);
}

.summary-item strong {
    color: var(--gray-900);
    font-weight: 600;
}

/* ===== Responsive ===== */
@media (max-width: 1440px) {
    .app-shell {
        grid-template-columns: 260px 1fr 280px;
    }
}

@media (max-width: 1024px) {
    .app-shell {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .sidebar {
        grid-row: 1;
        grid-column: 1;
    }

    .main-content {
        grid-column: 1;
    }

    .right-panel {
        grid-column: 1;
        grid-row: auto;
    }

    .content-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .app-shell {
        padding: 12px;
        gap: 12px;
    }

    .sidebar {
        padding: 16px;
    }

    .section-grid {
        grid-template-columns: 1fr;
    }

    .topbar {
        padding: 16px;
    }

    .topbar h1 {
        font-size: 20px;
    }
}