/* ========== Design Tokens (Modern Fintech Clean) ========== */
:root {
    /* Dark Theme (default) */
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-card: #111111;
    --bg-card-hover: #181818;
    --bg-input: #141414;
    --border: #222222;
    --border-hover: #333333;
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --accent: #ffffff;
    --accent-hover: #e4e4e7;
    --accent-glow: rgba(255, 255, 255, 0.05);
    --accent-glow-strong: rgba(255, 255, 255, 0.1);
    --success: #00c805;
    --success-light: #22c55e;
    --success-bg: rgba(0, 200, 5, 0.1);
    --danger: #ff5000;
    --danger-light: #ef4444;
    --danger-bg: rgba(255, 80, 0, 0.1);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.1);
    --info: #3b82f6;
    --info-bg: rgba(59, 130, 246, 0.1);
    --chart-colors: #ffffff, #00c805, #ff5000, #f59e0b, #3b82f6, #a855f7, #ec4899, #14b8a6, #eab308, #f97316;
    --radius: 8px;
    --radius-sm: 6px;
    --radius-xs: 4px;
    --shadow: 0 4px 20px rgba(0,0,0,0.5);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-glow: none;
    --transition: 0.2s ease-out;
    --transition-fast: 0.1s ease-out;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --glass: rgba(0, 0, 0, 0.85);
    --glass-border: rgba(255,255,255,0.08);
    --gradient-accent: var(--accent);
    --gradient-success: var(--success);
    --gradient-danger: var(--danger);
    --gradient-header: var(--bg-primary);
}

[data-theme="light"] {
    --bg-primary: #f9fafb;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-card-hover: #f3f4f6;
    --bg-input: #ffffff;
    --border: #e5e7eb;
    --border-hover: #d1d5db;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    --accent: #000000;
    --accent-hover: #1f2937;
    --accent-glow: rgba(0, 0, 0, 0.04);
    --accent-glow-strong: rgba(0, 0, 0, 0.08);
    --success: #00c805;
    --success-light: #16a34a;
    --success-bg: rgba(0, 200, 5, 0.1);
    --danger: #ff5000;
    --danger-light: #dc2626;
    --danger-bg: rgba(255, 80, 0, 0.1);
    --warning: #d97706;
    --warning-bg: rgba(217, 119, 6, 0.1);
    --info: #2563eb;
    --info-bg: rgba(37, 99, 235, 0.1);
    --chart-colors: #000000, #00c805, #ff5000, #d97706, #2563eb, #9333ea, #db2777, #0d9488, #ca8a04, #ea580c;
    --shadow: 0 4px 12px rgba(0,0,0,0.05);
    --shadow-sm: 0 1px 4px rgba(0,0,0,0.03);
    --shadow-glow: none;
    --glass: rgba(255,255,255,0.95);
    --glass-border: rgba(0,0,0,0.08);
    --gradient-header: var(--bg-primary);
}

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

html { font-size: 14px; scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    transition: background var(--transition), color var(--transition);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    display: flex;
    flex-direction: column;
}

/* ========== Scrollbar ========== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-hover); }

/* ========== Focus Ring ========== */
:focus-visible { outline: 1px solid var(--accent); outline-offset: 1px; }

/* ========== Header ========== */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
    height: 60px;
    background: var(--gradient-header);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.header-left { display: flex; align-items: center; gap: 16px; }
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--accent);
    text-decoration: none;
}
.logo h1 {
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.header-right { display: flex; align-items: center; gap: 24px; }
.portfolio-value { display: flex; align-items: center; gap: 12px; }
.portfolio-value .value {
    font-size: 1.2rem;
    font-weight: 500;
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.01em;
}

/* ========== Badge ========== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    font-variant-numeric: tabular-nums;
}
.badge.positive { background: var(--success-bg); color: var(--success); }
.badge.negative { background: var(--danger-bg); color: var(--danger); }
.badge.neutral { background: var(--bg-card-hover); color: var(--text-secondary); border: 1px solid var(--border); }

/* ========== Icon Button ========== */
.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 50%;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}
.btn-icon:hover { background: var(--bg-card-hover); color: var(--text-primary); }

/* ========== Tab Navigation ========== */
.tab-nav {
    display: flex;
    gap: 24px;
    padding: 0 28px;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    overflow-x: auto;
    scrollbar-width: none;
}
.tab-nav::-webkit-scrollbar { display: none; }

.tab-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 16px 4px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    border-bottom: 2px solid transparent;
    white-space: nowrap;
}
.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active { color: var(--text-primary); border-bottom-color: var(--accent); }
.tab-btn svg { width: 16px; height: 16px; stroke-width: 1.5; }

/* ========== Main Content ========== */
.main-content {
    padding: 32px 28px;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    flex: 1;
}
.tab-content { display: none; animation: fadeIn 0.3s ease; }
.tab-content.active { display: block; }

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

/* ========== Cards ========== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
}
.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}
.card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* ========== KPI Cards ========== */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}
.kpi-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    display: flex;
    flex-direction: column;
}
.kpi-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-weight: 500;
}
.kpi-value {
    font-size: 1.8rem;
    font-weight: 400;
    font-variant-numeric: tabular-nums;
    line-height: 1.1;
    letter-spacing: -0.02em;
}
.kpi-sub {
    font-size: 0.85rem;
    margin-top: 12px;
    font-weight: 500;
}

/* ========== Charts Grid ========== */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}
.chart-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
}
.chart-card .chart-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
}

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 16px;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}
.btn-primary {
    background: var(--accent);
    color: var(--bg-primary);
}
.btn-primary:hover { opacity: 0.9; }
.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border-color: var(--border);
}
.btn-secondary:hover { background: var(--bg-card-hover); }
.btn-danger { background: var(--danger-bg); color: var(--danger); }
.btn-danger:hover { background: var(--danger); color: white; }
.btn-sm { padding: 6px 12px; font-size: 0.8rem; }
.btn-group { display: flex; gap: 8px; flex-wrap: wrap; }

/* ========== Forms ========== */
.form-group { margin-bottom: 16px; }
.form-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}
.form-input, .form-select {
    width: 100%;
    padding: 8px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.9rem;
    transition: border-color var(--transition);
    outline: none;
}
.form-input:focus, .form-select:focus { border-color: var(--accent); }
.form-input::placeholder { color: var(--text-muted); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }

/* ========== Toolbar ========== */
.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}
.toolbar-left, .toolbar-right { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.filter-input {
    padding: 6px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.85rem;
    outline: none;
}
.filter-input:focus { border-color: var(--accent); }

/* ========== AG Grid Theme Override (Minimalist) ========== */
.ag-theme-alpine {
    --ag-background-color: var(--bg-card) !important;
    --ag-header-background-color: var(--bg-card) !important;
    --ag-odd-row-background-color: var(--bg-card) !important;
    --ag-row-hover-color: var(--bg-card-hover) !important;
    --ag-header-foreground-color: var(--text-secondary) !important;
    --ag-foreground-color: var(--text-primary) !important;
    --ag-border-color: var(--border) !important;
    --ag-secondary-foreground-color: var(--text-muted) !important;
    --ag-control-panel-background-color: var(--bg-secondary) !important;
    --ag-selected-row-background-color: var(--accent-glow) !important;
    --ag-range-selection-background-color: var(--accent-glow) !important;
    --ag-input-focus-border-color: var(--accent) !important;
    --ag-font-family: var(--font) !important;
    --ag-font-size: 13px !important;
    border-radius: var(--radius) !important;
    border: 1px solid var(--border) !important;
}
.ag-theme-alpine .ag-header { border-bottom: 1px solid var(--border) !important; }
.ag-theme-alpine .ag-row { border-bottom: 1px solid var(--border) !important; }

/* ========== Modal ========== */
.modal-overlay, .confirm-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}
.modal-overlay.active, .confirm-overlay.active { display: flex; }
.modal, .confirm-dialog {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow);
    animation: modalIn 0.2s ease-out;
}
.confirm-dialog { max-width: 400px; text-align: center; }
@keyframes modalIn {
    from { opacity: 0; transform: scale(0.98) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}
.modal-title { font-size: 1.2rem; font-weight: 500; margin-bottom: 24px; }
.modal-footer {
    display: flex; justify-content: flex-end; gap: 12px;
    margin-top: 24px; padding-top: 24px; border-top: 1px solid var(--border);
}

/* ========== Toast ========== */
.toast-container { position: fixed; bottom: 32px; right: 32px; z-index: 9999; display: flex; flex-direction: column; gap: 12px; }
.toast {
    padding: 16px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    display: flex; align-items: center; gap: 12px;
}
.toast.success { border-left: 3px solid var(--success); }
.toast.error { border-left: 3px solid var(--danger); }
.toast.warning { border-left: 3px solid var(--warning); }

/* ========== Upload Zone ========== */
.upload-zone {
    border: 1px dashed var(--border);
    border-radius: var(--radius);
    padding: 32px 20px;
    text-align: center;
    cursor: pointer;
    background: var(--bg-secondary);
    transition: all var(--transition);
}
.upload-zone:hover, .upload-zone.dragover { border-color: var(--accent); background: var(--bg-card-hover); }
.upload-zone input { display: none; }
.upload-zone svg { margin-bottom: 16px; color: var(--text-muted); }

/* ========== Alert Cards ========== */
.alert-card {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid transparent;
}
.alert-card.warning { background: var(--warning-bg); color: var(--warning); border-color: rgba(245,158,11,0.2); }
.alert-card.danger { background: var(--danger-bg); color: var(--danger); border-color: rgba(255,80,0,0.2); }

/* ========== Empty State ========== */
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-secondary); }
.empty-state svg { margin-bottom: 20px; stroke-width: 1; color: var(--text-muted); }
.empty-state h3 { font-size: 1.1rem; margin-bottom: 12px; font-weight: 500; color: var(--text-primary); }
.empty-state p { font-size: 0.9rem; margin-bottom: 24px; max-width: 400px; margin-left: auto; margin-right: auto; line-height: 1.5; }

/* ========== Skeleton ========== */
.skeleton { background: var(--bg-card-hover); animation: pulse 2s infinite ease-in-out; border-radius: var(--radius-xs); }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
.skeleton-line { height: 16px; margin-bottom: 12px; }
.skeleton-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; min-height: 120px; }
.skeleton-chart { height: 350px; border-radius: var(--radius); }

/* ========== Settings Page ========== */
.settings-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); gap: 16px; }

/* ========== Footer ========== */
.app-footer {
    padding: 24px 28px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
}
.footer-left { display: flex; align-items: center; gap: 8px; }
.footer-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--success); }

/* ========== Onboarding ========== */
.onboarding-banner {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    gap: 24px;
}
.onboarding-icon { font-size: 2.5rem; }

/* ========== Responsive ========== */
@media (max-width: 768px) {
    .app-header { padding: 0 16px; }
    .tab-nav { padding: 0 16px; }
    .main-content { padding: 24px 16px; }
    .charts-grid { grid-template-columns: 1fr; }
    .form-row, .form-row-3 { grid-template-columns: 1fr; }
    .toolbar { flex-direction: column; align-items: stretch; }
    .onboarding-banner { flex-direction: column; text-align: center; }
}