:root {
    --bg-body: #f8fafc;
    --bg-surface: #ffffff;
    --bg-surface-elevated: #f1f5f9;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --primary-color: #f97316;
    --primary-hover: #ea580c;
    --primary-glow: rgba(249, 115, 22, 0.15);
    --navbar-bg: rgba(255, 255, 255, 0.85);
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --table-header-bg: #f8fafc;
    --table-hover-bg: #f8fafc;
}

[data-bs-theme="dark"] {
    --bg-body: #0b0f19;
    --bg-surface: #131b2e;
    --bg-surface-elevated: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #243049;
    --primary-color: #fb923c;
    --primary-hover: #f97316;
    --primary-glow: rgba(251, 146, 60, 0.2);
    --navbar-bg: rgba(19, 27, 46, 0.85);
    --card-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.2);
    --table-header-bg: #162035;
    --table-hover-bg: #1a253c;
}

body {
    background-color: var(--bg-body);
    color: var(--text-main);
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.25s ease, color 0.25s ease;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: var(--text-main);
    letter-spacing: -0.02em;
}

.page-title {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* Navbar */
.app-navbar {
    background: var(--navbar-bg) !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 1020;
    transition: background 0.25s ease, border-color 0.25s ease;
}

.navbar-brand {
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--text-main) !important;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-brand .brand-badge {
    font-size: 0.65rem;
    background: linear-gradient(135deg, #f97316, #ef4444);
    color: #fff;
    padding: 2px 6px;
    border-radius: 6px;
    text-transform: uppercase;
    font-weight: 700;
}

.nav-link {
    color: var(--text-muted) !important;
    font-weight: 500;
    padding: 0.5rem 0.85rem !important;
    border-radius: 8px;
    transition: all 0.15s ease;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-main) !important;
    background: var(--bg-surface-elevated);
}

/* Theme Switcher Button */
.theme-toggle-btn {
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    width: 38px;
    height: 38px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.theme-toggle-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Modern Cards */
.card, .panel {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--card-shadow);
    transition: all 0.2s ease;
}

.card:hover {
    border-color: rgba(249, 115, 22, 0.4);
}

.card-header, .panel-heading {
    background-color: transparent;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.25rem;
    font-weight: 600;
    color: var(--text-main);
}

.card-body, .panel-body {
    padding: 1.5rem;
}

/* Forms */
.form-control, .form-select {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    border-radius: 10px;
    padding: 0.625rem 0.875rem;
    transition: all 0.2s ease;
}

.form-control:focus, .form-select:focus {
    background-color: var(--bg-surface);
    border-color: var(--primary-color);
    color: var(--text-main);
    box-shadow: 0 0 0 4px var(--primary-glow);
}

.form-label {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

/* Buttons */
.btn {
    font-weight: 600;
    border-radius: 10px;
    padding: 0.55rem 1.25rem;
    transition: all 0.15s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, #f97316, #ea580c);
    border: none;
    color: #fff;
    box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
}

.btn-primary:hover, .btn-primary:focus {
    background: linear-gradient(135deg, #ea580c, #c2410c);
    box-shadow: 0 6px 16px rgba(249, 115, 22, 0.4);
    transform: translateY(-1px);
}

.btn-outline-secondary {
    border-color: var(--border-color);
    color: var(--text-main);
    background: transparent;
}

.btn-outline-secondary:hover {
    background: var(--bg-surface-elevated);
    border-color: var(--border-color);
    color: var(--text-main);
}

/* Tables */
.table-modern-wrapper {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
}

.table {
    margin-bottom: 0;
    color: var(--text-main);
    --bs-table-bg: transparent;
}

.table > :not(caption) > * > * {
    background-color: transparent;
    color: var(--text-main);
    border-bottom: 1px solid var(--border-color);
    padding: 0.9rem 1.25rem;
    vertical-align: middle;
}

.table thead th {
    background-color: var(--table-header-bg);
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 700;
    border-bottom: 1px solid var(--border-color);
}

.table tbody tr:hover {
    background-color: var(--table-hover-bg);
}

/* Sidebar (Admin & Analytics) */
.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.sidebar-nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.65rem 1rem;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 10px;
    font-weight: 500;
    transition: all 0.15s ease;
}

.sidebar-nav-link:hover, .sidebar-nav-link.active {
    color: var(--text-main);
    background-color: var(--bg-surface-elevated);
}

.sidebar-nav-link.active {
    font-weight: 600;
    color: var(--primary-color);
}

/* Footer */
.app-footer {
    margin-top: auto;
    border-top: 1px solid var(--border-color);
    background: var(--bg-surface);
    color: var(--text-muted);
    padding: 1.5rem 0;
    font-size: 0.875rem;
}

/* Chart adaptivity for dark/light */
[data-bs-theme="dark"] .c3 text {
    fill: #94a3b8 !important;
}

[data-bs-theme="dark"] .c3-axis path, 
[data-bs-theme="dark"] .c3-axis line {
    stroke: #334155 !important;
}

[data-bs-theme="dark"] .c3-grid line {
    stroke: #1e293b !important;
}

[data-bs-theme="dark"] .c3-tooltip-container {
    color: #0f172a;
}