/* ============================================
   CSS Variables - Professional Corporate Theme
   ============================================ */
:root {
    /* Primary Colors - Professional Blue Palette */
    --color-primary: #1e40af;
    --color-primary-dark: #1e3a8a;
    --color-primary-light: #3b82f6;
    --color-primary-bg: #eff6ff;

    /* Secondary Colors */
    --color-secondary: #64748b;
    --color-secondary-dark: #475569;
    --color-secondary-light: #94a3b8;

    /* Accent Colors */
    --color-accent: #0891b2;
    --color-success: #059669;
    --color-warning: #d97706;
    --color-danger: #dc2626;
    --color-info: #0284c7;

    /* Neutral Colors */
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;

    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;

    /* Text Colors */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    --text-inverse: #ffffff;

    /* Border Colors */
    --border-light: #e2e8f0;
    --border-medium: #cbd5e1;
    --border-dark: #94a3b8;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -1px rgba(15, 23, 42, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.1), 0 4px 6px -2px rgba(15, 23, 42, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 10px 10px -5px rgba(15, 23, 42, 0.04);

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   Global Styles
   ============================================ */
* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 0.9375rem;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

/* ============================================
   Cards
   ============================================ */
.card {
    border: 0;
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-light);
    padding: var(--spacing-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

.card-body {
    padding: var(--spacing-lg);
}

.card-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-light);
    padding: var(--spacing-md) var(--spacing-lg);
}

/* Metric Cards */
.metric-card {
    border-left: 4px solid var(--color-primary);
    position: relative;
    overflow: hidden;
}

.metric-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--color-primary-bg) 0%, transparent 100%);
    border-radius: 0 0 0 100%;
    opacity: 0.5;
}

.metric-card .card-title {
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.metric-card .metric-value {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    line-height: 1;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-md);
    padding: 0.625rem 1.25rem;
    transition: all var(--transition-base);
    border: 1px solid transparent;
    font-size: 0.9375rem;
    line-height: 1.5;
}

.btn-primary {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--text-inverse);
}

.btn-primary:hover,
.btn-primary:focus {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline-primary {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-outline-primary:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    transform: translateY(-1px);
}

.btn-sm {
    padding: 0.375rem 0.875rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

/* ============================================
   Forms
   ============================================ */
.form-label {
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
}

.form-control,
.form-select {
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-md);
    padding: 0.625rem 0.875rem;
    font-size: 0.9375rem;
    transition: all var(--transition-base);
    background: var(--bg-primary);
    color: var(--text-primary);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-bg);
    outline: 0;
}

.form-control::placeholder {
    color: var(--text-tertiary);
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

/* ============================================
   Tables
   ============================================ */
.table {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.table thead {
    background: var(--bg-tertiary);
}

.table thead th {
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    padding: var(--spacing-md);
    border-bottom: 2px solid var(--border-medium);
}

.table tbody td {
    padding: var(--spacing-md);
    vertical-align: middle;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-light);
}

.table-row-link {
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.table-row-link:hover {
    background-color: var(--bg-tertiary);
}

/* ============================================
   Badges
   ============================================ */
.badge {
    font-weight: var(--font-weight-medium);
    padding: 0.35em 0.65em;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    letter-spacing: 0.025em;
}

.badge.bg-success {
    background-color: var(--color-success) !important;
}

.badge.bg-warning {
    background-color: var(--color-warning) !important;
}

.badge.bg-danger {
    background-color: var(--color-danger) !important;
}

.badge.bg-info {
    background-color: var(--color-info) !important;
}

.badge.bg-primary {
    background-color: var(--color-primary) !important;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    box-shadow: var(--shadow-md);
    padding: var(--spacing-md) 0;
}

.navbar-brand {
    font-weight: var(--font-weight-bold);
    font-size: 1.25rem;
    letter-spacing: -0.025em;
}

.nav-link {
    font-weight: var(--font-weight-medium);
    padding: 0.5rem 1rem !important;
    transition: all var(--transition-fast);
    border-radius: var(--radius-md);
    margin: 0 0.25rem;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* ============================================
   Kanban Board
   ============================================ */
.kanban-board {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-lg);
    padding: var(--spacing-md) 0;
}

.kanban-column {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    min-height: 400px;
    border: 1px solid var(--border-light);
}

.kanban-header {
    font-weight: var(--font-weight-semibold);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--border-light);
    color: var(--text-primary);
}

.kanban-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    cursor: move;
    transition: all var(--transition-base);
}

.kanban-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.kanban-card.dragging {
    opacity: 0.5;
    transform: scale(0.95);
}

.kanban-card-title {
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-size: 0.9375rem;
}

.kanban-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-top: var(--spacing-sm);
}

/* ============================================
   Modals
   ============================================ */
.modal-content {
    border: 0;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.modal-header {
    border-bottom: 1px solid var(--border-light);
    padding: var(--spacing-lg);
}

.modal-title {
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    border-top: 1px solid var(--border-light);
    padding: var(--spacing-md) var(--spacing-lg);
}

/* ============================================
   Alerts
   ============================================ */
.alert {
    border-radius: var(--radius-md);
    border: 0;
    padding: var(--spacing-md) var(--spacing-lg);
    font-weight: var(--font-weight-medium);
}

.alert-success {
    background-color: #ecfdf5;
    color: #065f46;
}

.alert-warning {
    background-color: #fffbeb;
    color: #92400e;
}

.alert-danger {
    background-color: #fef2f2;
    color: #991b1b;
}

.alert-info {
    background-color: #f0f9ff;
    color: #075985;
}

/* ============================================
   Pagination
   ============================================ */
.pagination {
    gap: 0.5rem;
}

.page-link {
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-md);
    color: var(--color-primary);
    padding: 0.5rem 0.875rem;
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-base);
}

.page-link:hover {
    background-color: var(--color-primary-bg);
    border-color: var(--color-primary);
}

.page-item.active .page-link {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

/* ============================================
   List Groups
   ============================================ */
.list-group-item {
    border-color: var(--border-light);
    padding: var(--spacing-md) var(--spacing-lg);
    transition: background-color var(--transition-fast);
}

.list-group-item:hover {
    background-color: var(--bg-tertiary);
}

.list-group-item.active {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

/* ============================================
   Utilities
   ============================================ */
.text-muted {
    color: var(--text-tertiary) !important;
}

.bg-light {
    background-color: var(--bg-tertiary) !important;
}

.border-light {
    border-color: var(--border-light) !important;
}

/* Loading Spinner */
.spinner-border-sm {
    width: 1rem;
    height: 1rem;
    border-width: 0.15em;
}

/* ============================================
   Responsive Design - Mobile First
   ============================================ */
@media (max-width: 768px) {
    /* Typography */
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }

    /* Spacing */
    .card-body,
    .card-header {
        padding: var(--spacing-md);
    }

    /* Tables - Responsive scroll */
    .table-responsive {
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-sm);
    }

    /* Kanban Board - Single column on mobile */
    .kanban-board {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    /* Buttons - Full width on mobile */
    .btn-mobile-full {
        width: 100%;
        margin-bottom: var(--spacing-sm);
    }

    /* Navigation */
    .navbar-collapse {
        margin-top: var(--spacing-md);
    }

    .nav-link {
        padding: var(--spacing-sm) var(--spacing-md) !important;
        margin: 0.125rem 0;
    }

    /* Metric cards - Better spacing */
    .metric-card {
        margin-bottom: var(--spacing-md);
    }
}

@media (max-width: 576px) {
    /* Even smaller screens */
    body {
        font-size: 0.875rem;
    }

    .card-body {
        padding: var(--spacing-sm);
    }

    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    body {
        background: white;
    }

    .navbar,
    .btn,
    .pagination {
        display: none;
    }

    .card {
        box-shadow: none;
        border: 1px solid var(--border-light);
        page-break-inside: avoid;
    }
}

/* ============================================
   Scoring Circle
   ============================================ */
.scoring-circle {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: conic-gradient(
        var(--rating-color) calc(var(--rating-percent) * 3.6deg),
        var(--color-gray-200) calc(var(--rating-percent) * 3.6deg)
    );
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.scoring-circle::before {
    content: '';
    position: absolute;
    width: 76px;
    height: 76px;
    border-radius: 50%;
    background: var(--bg-primary);
}

.scoring-value {
    position: relative;
    z-index: 1;
    font-size: 1.75rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
}

/* ============================================
   Timeline
   ============================================ */
.timeline {
    position: relative;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-light);
}

.timeline-item {
    position: relative;
    padding-bottom: var(--spacing-lg);
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -40px;
    top: 2px;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 0 4px var(--bg-primary);
    z-index: 1;
}

.timeline-content {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    transition: background-color var(--transition-fast);
}

.timeline-content:hover {
    background: var(--color-primary-bg);
    border-color: var(--color-primary-light);
}