/* 
 * Mutual Fund Returns Tracker - Premium Design System
 * Inspired by Stripe/Linear/Vercel aesthetics
 */

/* ================================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ================================================ */
:root {
    /* Colors - Slate Theme */
    --color-header-bg: #0f172a;
    --color-header-text: #f8fafc;
    --color-body-bg: #f8fafc;
    --color-card-bg: #ffffff;
    --color-border: #e2e8f0;
    --color-border-subtle: #f1f5f9;
    --color-text-primary: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;

    /* Accent Colors */
    --color-accent: #3b82f6;
    --color-accent-hover: #2563eb;
    --color-accent-light: #eff6ff;

    /* Return Colors - Positive (Emerald) */
    --color-positive: #10b981;
    --color-positive-bg: #d1fae5;
    --color-positive-text: #065f46;

    /* Return Colors - Negative (Rose) */
    --color-negative: #f43f5e;
    --color-negative-bg: #ffe4e6;
    --color-negative-text: #9f1239;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.8125rem;
    --font-size-base: 0.875rem;
    --font-size-lg: 1rem;
    --font-size-xl: 1.125rem;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

/* ================================================
   BASE STYLES
   ================================================ */
body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    background-color: var(--color-body-bg);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ================================================
   NAVIGATION BAR
   ================================================ */
.navbar {
    background-color: var(--color-header-bg) !important;
    box-shadow: var(--shadow-md);
    padding: var(--spacing-sm) var(--spacing-md);
}

.navbar-brand {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-header-text) !important;
    letter-spacing: -0.01em;
}

/* Status Pill */
.navbar-text {
    color: var(--color-header-text) !important;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    backdrop-filter: blur(4px);
}

/* Refresh Button */
.refresh-btn {
    border: 1px solid rgba(255, 255, 255, 0.2) !important;
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-header-text) !important;
    border-radius: var(--radius-md);
    padding: var(--spacing-xs) var(--spacing-sm);
    transition: all var(--transition-fast);
}

.refresh-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3) !important;
}

.refresh-btn:active {
    transform: rotate(180deg);
}

/* ================================================
   SECTION TABS (Portfolio vs Research)
   ================================================ */
#sectionTabs .nav-link {
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    padding: var(--spacing-sm) var(--spacing-lg);
    transition: all var(--transition-base);
}

#sectionTabs .nav-link:hover {
    color: var(--color-text-primary);
    background-color: var(--color-border-subtle);
}

#sectionTabs .nav-link.active {
    background-color: var(--color-header-bg) !important;
    color: var(--color-header-text) !important;
    box-shadow: var(--shadow-sm);
}

/* ================================================
   CARDS
   ================================================ */
.card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

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

/* ================================================
   VIEW TOGGLE (Segmented Control)
   ================================================ */
.btn-group[role="group"] {
    background: var(--color-border-subtle);
    padding: 3px;
    border-radius: var(--radius-md);
}

.btn-group .btn-check+.btn {
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.btn-group .btn-check:checked+.btn {
    background: var(--color-card-bg);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-sm);
}

.btn-group .btn-check+.btn:hover {
    color: var(--color-text-primary);
}

/* Secondary button group (Expand/Collapse) */
#expandCollapseButtons {
    background: transparent;
    padding: 0;
}

#expandCollapseButtons .btn {
    border: 1px solid var(--color-border);
    background: var(--color-card-bg);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

#expandCollapseButtons .btn:hover {
    background: var(--color-border-subtle);
    color: var(--color-text-primary);
}

/* ================================================
   TABLE STYLES
   ================================================ */
.table {
    background: var(--color-card-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: 0;
}

/* Table Header */
.table thead th {
    background: var(--color-border-subtle);
    border-bottom: 1px solid var(--color-border);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--spacing-md) var(--spacing-md);
    white-space: nowrap;
    position: sticky;
    top: 0;
    z-index: 10;
}

.table thead th small {
    display: block;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-normal);
    text-transform: none;
    letter-spacing: normal;
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
}

/* Table Body */
.table tbody td {
    padding: var(--spacing-md) var(--spacing-md);
    border-bottom: 1px solid var(--color-border-subtle);
    vertical-align: middle;
    font-size: var(--font-size-base);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

/* Row Hover */
.fund-row {
    transition: background-color var(--transition-fast);
}

.fund-row:hover,
.clickable-row:hover {
    background-color: var(--color-border-subtle) !important;
}

/* Fund Name */
.fund-name {
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
}

.fund-name-column {
    min-width: 280px !important;
}

.fund-name-cell {
    max-width: 320px;
}

/* AMFI Code */
.amfi-code {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    background: var(--color-border-subtle);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
}

/* NAV Value */
.current-nav-value {
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

/* Sortable Columns */
.sortable {
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.sortable:hover {
    background-color: var(--color-border) !important;
}

.sortable i {
    font-size: 0.7rem;
    opacity: 0.4;
    margin-left: 4px;
    transition: opacity var(--transition-fast);
}

.sortable:hover i {
    opacity: 0.8;
}

.sortable.asc i,
.sortable.desc i {
    opacity: 1;
    color: var(--color-accent);
}

/* ================================================
   RETURN VALUE PILLS
   ================================================ */
/* Positive Returns */
.text-success {
    color: var(--color-positive) !important;
    font-weight: var(--font-weight-medium);
}

/* Negative Returns */
.text-danger {
    color: var(--color-negative) !important;
    font-weight: var(--font-weight-medium);
}

/* Muted/NA */
.text-muted {
    color: var(--color-text-muted) !important;
}

/* ================================================
   ACCORDION (Expanded Rows)
   ================================================ */
.accordion-icon {
    color: var(--color-text-muted);
    transition: transform var(--transition-base);
}

.clickable-row[aria-expanded="true"] .accordion-icon {
    transform: rotate(90deg);
    color: var(--color-accent);
}

.accordion-body-cell {
    padding: 0 !important;
    background-color: var(--color-border-subtle);
}

.accordion-content {
    border-left: 3px solid var(--color-accent);
    padding: var(--spacing-lg);
    background: linear-gradient(to right, var(--color-accent-light), var(--color-card-bg));
}

.accordion-content .card {
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.accordion-content .card-header {
    background: var(--color-border-subtle);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    padding: var(--spacing-sm) var(--spacing-md);
}

.accordion-content table td {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
}

/* ================================================
   COMPARISON MATRIX VIEW
   ================================================ */
#comparisonViewContainer .card-header {
    background: var(--color-header-bg);
    color: var(--color-header-text);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    padding: var(--spacing-md);
}

#comparisonViewContainer .card-header h5 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin: 0;
}

/* Tabs */
.nav-tabs {
    border-bottom: 1px solid var(--color-border);
    background: var(--color-card-bg);
}

.nav-tabs .nav-link {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    transition: all var(--transition-fast);
}

.nav-tabs .nav-link:hover {
    color: var(--color-text-primary);
    background: var(--color-border-subtle);
}

.nav-tabs .nav-link.active {
    color: var(--color-header-text) !important;
    background-color: var(--color-accent) !important;
    border-radius: var(--radius-sm);
    margin: 4px;
}

/* Sticky Column */
.sticky-start {
    position: sticky;
    left: 0;
    z-index: 5;
    background-color: var(--color-card-bg) !important;
    box-shadow: 2px 0 4px rgba(0, 0, 0, 0.05);
}

/* ================================================
   NOTES SECTION
   ================================================ */
.notes-section {
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.notes-section h5 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.notes-section h6 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
}

.notes-section .form-control {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.notes-section .form-control:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.notes-section .list-group-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
}

/* ================================================
   FOOTER
   ================================================ */
.footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-md);
    background: var(--color-card-bg);
    margin-top: var(--spacing-xl);
}

.footer small {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* ================================================
   UTILITY CLASSES
   ================================================ */
.loading {
    opacity: 0.5;
    pointer-events: none;
}

/* ================================================
   RESPONSIVE DESIGN
   ================================================ */
@media (max-width: 768px) {
    .fund-name-column {
        min-width: 200px !important;
    }

    .fund-name {
        font-size: var(--font-size-sm);
    }

    .table thead th,
    .table tbody td {
        padding: var(--spacing-sm);
        font-size: var(--font-size-sm);
    }

    .navbar-brand {
        font-size: var(--font-size-base);
    }

    .navbar-text {
        font-size: var(--font-size-xs);
        padding: 2px 8px;
    }

    .btn-group .btn-check+.btn {
        font-size: var(--font-size-xs);
        padding: 4px 8px;
    }
}

@media (max-width: 576px) {
    .fund-name-column {
        min-width: 150px !important;
    }

    .navbar-text {
        display: none;
    }

    #expandCollapseButtons {
        display: none;
    }
}

/* ================================================
   PRINT STYLES
   ================================================ */
@media print {

    .navbar,
    .footer,
    .refresh-btn,
    .notes-section,
    #expandCollapseButtons {
        display: none !important;
    }

    .table {
        box-shadow: none;
        border: 1px solid #ddd;
    }

    .table thead th {
        background-color: #f8f9fa !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
}

/* ================================================
   BOOTSTRAP OVERRIDES (Enforce Design System)
   ================================================ */
/* Buttons */
.btn-primary {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
}

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

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

.text-primary {
    color: var(--color-accent) !important;
}

/* Year Period Colors (Mapping Bootstrap to Theme) */
/* Info = 2 Year (Blue-ish) */
.bg-info {
    background-color: #0ea5e9 !important;
    /* Sky blue */
}

.table-info {
    background-color: #e0f2fe !important;
    --bs-table-bg: #e0f2fe;
}

.text-info {
    color: #0284c7 !important;
}

/* Success = 3 Year (Emerald - matches positive) */
.bg-success {
    background-color: var(--color-positive) !important;
}

.table-success {
    background-color: var(--color-positive-bg) !important;
    --bs-table-bg: var(--color-positive-bg);
}

/* Warning = 5 Year (Amber/Orange) */
.bg-warning {
    background-color: #f59e0b !important;
    /* Amber 500 */
    color: white !important;
}

.table-warning {
    background-color: #fef3c7 !important;
    --bs-table-bg: #fef3c7;
}