/* ===== Reset & Variables ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: #1a2235;
    --bg-card-hover: #1f2a40;
    --border: #2a3550;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --positive: #22c55e;
    --negative: #ef4444;
    --neutral: #f59e0b;

    --brazil: #22c55e;
    --russia: #3b82f6;
    --india: #f59e0b;
    --china: #ef4444;
    --south-africa: #a855f7;

    --sidebar-width: 220px;
    --topbar-height: 48px;
    --radius: 10px;
    --radius-sm: 6px;
    --gap: 10px;
    --transition: 0.2s ease;
}

html, body {
    height: 100vh;
    overflow: hidden;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 13px;
}

body {
    display: flex;
}

/* ===== Sidebar ===== */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 100;
    transition: transform var(--transition);
}

.sidebar-header {
    padding: 16px 16px 12px;
    border-bottom: 1px solid var(--border);
}

.logo {
    font-size: 1.6rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--brazil), var(--russia), var(--india), var(--china), var(--south-africa));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 2px;
}

.logo-sub {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 3px;
    display: block;
    margin-top: 1px;
}

.nav-links {
    list-style: none;
    padding: 8px 6px;
    flex: 1;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    font-weight: 500;
    font-size: 0.85rem;
    margin-bottom: 1px;
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-card);
}

.nav-link.active {
    color: var(--accent);
    background: rgba(59, 130, 246, 0.1);
}

.sidebar-footer {
    padding: 10px 16px;
    border-top: 1px solid var(--border);
    font-size: 0.65rem;
    color: var(--text-muted);
}

/* ===== Main Content ===== */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.top-bar {
    height: var(--topbar-height);
    min-height: var(--topbar-height);
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 16px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
    z-index: 50;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 4px;
}

.page-title {
    font-size: 1.05rem;
    font-weight: 600;
    white-space: nowrap;
}

.top-bar-actions {
    margin-left: auto;
    overflow-x: auto;
}

.country-filters {
    display: flex;
    gap: 5px;
}

.country-chip {
    display: flex;
    align-items: center;
    gap: 3px;
    padding: 4px 10px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.country-chip:hover {
    border-color: var(--accent);
    color: var(--text-primary);
}

.country-chip.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.country-chip .flag {
    font-size: 0.85rem;
}

/* ===== Viewport Content ===== */
.viewport-content {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.content-section {
    display: none;
    position: absolute;
    inset: 0;
    padding: var(--gap);
    animation: fadeIn 0.25s ease;
}

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ===== Chart Cards ===== */
.chart-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
}

.chart-header {
    margin-bottom: 6px;
    flex-shrink: 0;
}

.chart-header h3 {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
}

.chart-fill {
    flex: 1;
    position: relative;
    min-height: 0;
}

.chart-fill canvas {
    position: absolute;
    inset: 0;
    width: 100% !important;
    height: 100% !important;
}

/* ===== Overview Grid ===== */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: auto 1fr auto;
    gap: var(--gap);
    height: 100%;
}

.overview-grid .area-trend { grid-column: 1 / 4; }
.overview-grid .area-share { grid-column: 4 / 5; }
.overview-grid .area-countries { grid-column: 1 / -1; }

/* Stat Cards */
.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 14px;
}

.stat-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.1;
}

.stat-change {
    font-size: 0.7rem;
    font-weight: 500;
    margin-top: 3px;
}

.stat-change.positive { color: var(--positive); }
.stat-change.negative { color: var(--negative); }
.stat-change.neutral { color: var(--neutral); }

/* Country Strip */
.country-strip {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--gap);
}

.country-mini {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 12px;
    position: relative;
    overflow: hidden;
}

.country-mini::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
}

.country-mini.brazil::before { background: var(--brazil); }
.country-mini.russia::before { background: var(--russia); }
.country-mini.india::before { background: var(--india); }
.country-mini.china::before { background: var(--china); }
.country-mini.south-africa::before { background: var(--south-africa); }

.cm-head {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 6px;
    font-size: 0.85rem;
}

.cm-head span:first-child {
    font-size: 1.1rem;
}

.cm-stats {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.cm-stats > div {
    display: flex;
    justify-content: space-between;
    font-size: 0.72rem;
    color: var(--text-secondary);
}

.cm-stats .positive { color: var(--positive); font-weight: 600; }

/* ===== 2x2 Panel Grid ===== */
.panel-grid.two-by-two {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: var(--gap);
    height: 100%;
}

/* ===== Comparison Layout ===== */
.comparison-layout {
    display: flex;
    flex-direction: column;
    height: 100%;
    gap: var(--gap);
}

.comparison-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    flex-shrink: 0;
}

.comparison-controls label {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.comparison-controls select {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 5px 12px;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.8rem;
    cursor: pointer;
    outline: none;
}

.comparison-controls select:focus {
    border-color: var(--accent);
}

.comparison-charts {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--gap);
    min-height: 0;
}

/* ===== Data Table ===== */
.data-table-wrapper {
    flex: 1;
    overflow: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.78rem;
}

.data-table th {
    text-align: left;
    padding: 7px 10px;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    font-size: 0.62rem;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    background: var(--bg-card);
}

.data-table td {
    padding: 7px 10px;
    border-bottom: 1px solid rgba(42, 53, 80, 0.5);
    color: var(--text-secondary);
}

.data-table tr:hover td {
    background: rgba(59, 130, 246, 0.05);
    color: var(--text-primary);
}

.data-table .country-cell {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 500;
    color: var(--text-primary);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .main-content {
        margin-left: 0;
    }
    .menu-toggle {
        display: block;
    }
    .country-filters {
        display: none;
    }
    .overview-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: auto auto 1fr auto;
    }
    .overview-grid .area-trend { grid-column: 1 / -1; }
    .overview-grid .area-share { grid-column: 1 / -1; }
    .panel-grid.two-by-two {
        grid-template-columns: 1fr;
        grid-template-rows: repeat(4, 1fr);
    }
    .comparison-charts {
        grid-template-columns: 1fr;
    }
    .country-strip {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 4px;
    height: 4px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 2px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ===== Overlay for mobile sidebar ===== */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 99;
}

.sidebar-overlay.active {
    display: block;
}