/* ==========================================================================
   Institution Rankings — Custom Design System
   UConn navy + blue palette · Space Grotesk · Bootstrap 5.3 dark mode
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens (CSS Custom Properties)
   -------------------------------------------------------------------------- */

:root {
    /* Brand palette */
    --brand-navy:          #000E2F;
    --brand-navy-light:    #1a2947;
    --brand-navy-rgb:      0, 14, 47;

    --brand-accent:        #2563EB;
    --brand-accent-hover:  #1D4ED8;
    --brand-accent-light:  #BFDBFE;
    --brand-accent-subtle: rgba(37, 99, 235, 0.10);
    --brand-accent-rgb:    37, 99, 235;

    /* Surfaces */
    --surface-primary:     #ffffff;
    --surface-secondary:   #f8f9fa;
    --surface-card:        #ffffff;
    --surface-sidebar:     #f1f3f5;
    --surface-code:        #f1f3f5;

    /* Text */
    --text-primary:        #0f172a;
    --text-secondary:      #475569;
    --text-muted:          #94a3b8;
    --text-on-brand:       #ffffff;

    /* Borders */
    --border-default:      #e2e8f0;
    --border-subtle:       #f1f5f9;

    /* Shadows */
    --shadow-sm:           0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md:           0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg:           0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-accent:       0 4px 14px rgba(37, 99, 235, 0.25);

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

    /* Transitions */
    --transition-fast:     150ms ease;
    --transition-base:     250ms ease;
    --transition-slow:     400ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark mode overrides */
[data-bs-theme="dark"] {
    --brand-accent:        #60A5FA;
    --brand-accent-hover:  #3B82F6;
    --brand-accent-light:  #1E3A5F;
    --brand-accent-subtle: rgba(96, 165, 250, 0.15);
    --brand-accent-rgb:    96, 165, 250;

    --surface-primary:     #0f172a;
    --surface-secondary:   #1e293b;
    --surface-card:        #1e293b;
    --surface-sidebar:     #1e293b;
    --surface-code:        #334155;

    --text-primary:        #f1f5f9;
    --text-secondary:      #cbd5e1;
    --text-muted:          #64748b;
    --text-on-brand:       #ffffff;

    --border-default:      #334155;
    --border-subtle:       #1e293b;

    --shadow-sm:           0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md:           0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg:           0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-accent:       0 4px 14px rgba(96, 165, 250, 0.2);
}


/* --------------------------------------------------------------------------
   2. Typography
   -------------------------------------------------------------------------- */

body {
    font-family: 'Space Grotesk', -apple-system, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-primary);
    background-color: var(--surface-primary);
    letter-spacing: -0.01em;
}

h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3, .h4, .h5, .h6 {
    font-family: 'Space Grotesk', -apple-system, 'Segoe UI', Roboto, sans-serif;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.text-brand {
    color: var(--brand-navy) !important;
}

[data-bs-theme="dark"] .text-brand {
    color: var(--brand-accent) !important;
}

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


/* --------------------------------------------------------------------------
   3. Navbar
   -------------------------------------------------------------------------- */

.navbar-brand-custom {
    background-color: #0F2D5E;
    border-bottom: 3px solid var(--brand-accent);
    transition: border-color var(--transition-base);
}

[data-bs-theme="dark"] .navbar-brand-custom {
    background-color: #162544;
    border-bottom-color: var(--brand-accent);
}

.navbar-brand-custom .navbar-brand {
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.03em;
    color: var(--text-on-brand) !important;
}

.navbar-brand-custom .nav-link {
    font-weight: 500;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.75) !important;
    transition: color var(--transition-fast);
    position: relative;
}

.navbar-brand-custom .nav-link:hover,
.navbar-brand-custom .nav-link.active {
    color: #ffffff !important;
}

.navbar-brand-custom .nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0.5rem;
    right: 0.5rem;
    height: 2px;
    background: var(--brand-accent);
    border-radius: 1px;
}

/* Theme toggle */
.theme-toggle {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    color: var(--brand-accent);
}


/* --------------------------------------------------------------------------
   4. Cards
   -------------------------------------------------------------------------- */

.card {
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    background-color: var(--surface-card);
    transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header-brand {
    background-color: var(--brand-navy);
    color: var(--text-on-brand);
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: -0.01em;
    border-bottom: 2px solid var(--brand-accent);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0 !important;
}

[data-bs-theme="dark"] .card-header-brand {
    background-color: var(--surface-secondary);
    border-bottom-color: var(--brand-accent);
}

.card-sidebar {
    background-color: var(--surface-sidebar);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
}


/* --------------------------------------------------------------------------
   5. Tables
   -------------------------------------------------------------------------- */

.table-custom {
    --bs-table-bg: transparent;
    margin-bottom: 0;
    font-size: 0.9rem;
}

.table-custom thead th {
    background-color: var(--surface-secondary);
    color: var(--text-primary);
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-bottom: 2px solid var(--brand-accent);
    padding: 0.75rem 1rem;
    white-space: nowrap;
}

.table-custom tbody td {
    padding: 0.75rem 1rem;
    vertical-align: middle;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-primary);
}

.table-custom tbody tr {
    transition: background-color var(--transition-fast);
}

.table-custom tbody tr:hover {
    background-color: var(--brand-accent-subtle);
}


/* --------------------------------------------------------------------------
   6. Rankings Table Specifics
   -------------------------------------------------------------------------- */

.rankings-table th:nth-child(1),
.rankings-table td:nth-child(1) { width: 70px; text-align: center; }
.rankings-table th:nth-child(2),
.rankings-table td:nth-child(2) { min-width: 300px; }
.rankings-table th:nth-child(3),
.rankings-table td:nth-child(3) { width: 120px; text-align: center; }
.rankings-table th:nth-child(4),
.rankings-table td:nth-child(4) { width: 110px; text-align: center; }

.rank-number {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

.rank-top .rank-number {
    color: var(--brand-accent);
}

.score-value {
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--brand-accent);
    font-variant-numeric: tabular-nums;
}

/* Top row highlights */
.rankings-table tbody tr.rank-gold {
    background-color: rgba(var(--brand-accent-rgb), 0.15);
    border-left: 4px solid var(--brand-accent);
}

.rankings-table tbody tr.rank-silver,
.rankings-table tbody tr.rank-bronze {
    background-color: rgba(var(--brand-accent-rgb), 0.07);
    border-left: 4px solid rgba(var(--brand-accent-rgb), 0.4);
}

.rankings-table tbody tr.rank-top5 {
    border-left: 3px solid rgba(var(--brand-accent-rgb), 0.25);
}

/* Factor chips */
.factor-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    background-color: var(--surface-secondary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    padding: 0.2rem 0.5rem;
    font-size: 0.78rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.factor-chip .factor-pct {
    font-weight: 700;
    color: var(--brand-accent);
    font-size: 0.72rem;
}

/* Institution link */
.institution-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.institution-link:hover {
    color: var(--brand-accent);
}


/* --------------------------------------------------------------------------
   7. Sidebar & Range Sliders
   -------------------------------------------------------------------------- */

.sidebar-sticky {
    position: sticky;
    top: 1rem;
    max-height: calc(100vh - 2rem);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--border-default) transparent;
}

.sidebar-section-title {
    font-weight: 700;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--brand-accent);
}

/* Custom range slider */
.form-range::-webkit-slider-runnable-track {
    height: 6px;
    border-radius: 3px;
    background: var(--border-default);
}

.form-range::-webkit-slider-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--brand-accent);
    border: 2px solid var(--surface-card);
    box-shadow: var(--shadow-sm);
    margin-top: -6px;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.form-range::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: var(--shadow-accent);
}

.form-range::-webkit-slider-thumb:active {
    transform: scale(1.05);
}

.form-range::-moz-range-track {
    height: 6px;
    border-radius: 3px;
    background: var(--border-default);
    border: none;
}

.form-range::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--brand-accent);
    border: 2px solid var(--surface-card);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
}

/* Weight badge */
.weight-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2rem;
    height: 1.5rem;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 999px;
    background-color: var(--surface-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-default);
    transition: all var(--transition-fast);
    font-variant-numeric: tabular-nums;
}

.weight-badge.active {
    background-color: var(--brand-accent);
    color: #fff;
    border-color: var(--brand-accent);
    box-shadow: var(--shadow-accent);
}

/* Slider label */
.slider-label {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.slider-label.emphasized {
    font-weight: 700;
    color: var(--text-primary);
}

/* Filter checkboxes */
.filter-group-title {
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.form-check-input:checked {
    background-color: var(--brand-accent);
    border-color: var(--brand-accent);
}


/* --------------------------------------------------------------------------
   8. Toggle Switches (for metrics admin)
   -------------------------------------------------------------------------- */

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 22px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-switch .toggle-slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background-color: var(--border-default);
    border-radius: 999px;
    transition: background-color var(--transition-fast);
}

.toggle-switch .toggle-slider::before {
    content: '';
    position: absolute;
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    border-radius: 50%;
    transition: transform var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.toggle-switch input:checked + .toggle-slider {
    background-color: var(--brand-accent);
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(18px);
}


/* --------------------------------------------------------------------------
   9. Badges & Chips
   -------------------------------------------------------------------------- */

.badge-accent {
    background-color: var(--brand-accent) !important;
    color: #fff !important;
    font-weight: 700;
    font-size: 0.75rem;
}

.badge-brand {
    background-color: var(--brand-navy) !important;
    color: var(--text-on-brand) !important;
    font-weight: 600;
}

[data-bs-theme="dark"] .badge-brand {
    background-color: var(--surface-code) !important;
}

.top-factor-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.3rem 0.65rem;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 600;
    background-color: rgba(var(--brand-accent-rgb), 0.15);
    color: var(--brand-accent-hover);
    border: 1px solid rgba(var(--brand-accent-rgb), 0.3);
}

[data-bs-theme="dark"] .top-factor-badge {
    color: var(--brand-accent);
}


/* --------------------------------------------------------------------------
   10. Hero Card (Institution Detail)
   -------------------------------------------------------------------------- */

.hero-card {
    background: linear-gradient(135deg, var(--brand-navy) 0%, var(--brand-navy-light) 100%);
    color: var(--text-on-brand);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    border: none;
}

.hero-card h1 {
    color: var(--text-on-brand);
    font-size: 1.75rem;
}

.hero-rank-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background-color: var(--brand-accent);
    color: #fff;
    font-weight: 700;
    font-size: 0.9rem;
    padding: 0.4rem 1rem;
    border-radius: 999px;
}

.hero-ipeds {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.85rem;
}

/* Metric bar */
.metric-bar-track {
    height: 10px;
    border-radius: 999px;
    background-color: var(--surface-secondary);
    overflow: hidden;
}

.metric-bar-fill {
    height: 100%;
    border-radius: 999px;
    transition: width var(--transition-slow);
}

.percentile-badge {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.2rem 0.5rem;
    border-radius: 999px;
}


/* --------------------------------------------------------------------------
   11. Modal
   -------------------------------------------------------------------------- */

.modal-header-brand {
    background-color: var(--brand-navy);
    color: var(--text-on-brand);
    border-bottom: 2px solid var(--brand-accent);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

[data-bs-theme="dark"] .modal-header-brand {
    background-color: var(--surface-secondary);
}

.modal-header-brand .btn-close {
    filter: invert(1) grayscale(100%) brightness(200%);
}

.modal-content {
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-default);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.formula-box {
    background-color: var(--surface-code);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: 1rem;
    font-size: 0.85rem;
}

.formula-box code {
    color: var(--brand-accent);
    font-weight: 600;
}


/* --------------------------------------------------------------------------
   12. Import / Upload Zone
   -------------------------------------------------------------------------- */

.upload-zone {
    border: 2px dashed var(--border-default);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    transition: all var(--transition-base);
    background-color: var(--surface-secondary);
    cursor: pointer;
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--brand-accent);
    background-color: var(--brand-accent-subtle);
}

.upload-zone .upload-label {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.upload-zone .upload-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.upload-zone .upload-filename {
    font-weight: 700;
    color: var(--brand-accent);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}


/* --------------------------------------------------------------------------
   13. Tabs (Metrics Admin)
   -------------------------------------------------------------------------- */

.nav-tabs-bold {
    border-bottom: 2px solid var(--border-default);
    gap: 0;
}

.nav-tabs-bold .nav-link {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-muted);
    border: none;
    border-bottom: 3px solid transparent;
    padding: 0.75rem 1.25rem;
    margin-bottom: -2px;
    transition: all var(--transition-fast);
    border-radius: 0;
    background: none;
}

.nav-tabs-bold .nav-link:hover {
    color: var(--text-primary);
    border-bottom-color: var(--border-default);
}

.nav-tabs-bold .nav-link.active {
    color: var(--brand-accent);
    border-bottom-color: var(--brand-accent);
    background: none;
}

.nav-tabs-bold .nav-link .badge {
    font-size: 0.7rem;
    vertical-align: middle;
}


/* --------------------------------------------------------------------------
   14. Animations
   -------------------------------------------------------------------------- */

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

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

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scoreFlash {
    0%   { background-color: rgba(var(--brand-accent-rgb), 0.3); }
    100% { background-color: transparent; }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50%      { opacity: 0.4; }
}

.fade-in        { animation: fadeIn 0.35s ease-in-out; }
.fade-out       { animation: fadeOut 0.25s ease-in-out forwards; }
.loading-pulse  { animation: pulse 1.5s ease-in-out infinite; }
.rank-row-enter { animation: slideIn 0.5s cubic-bezier(0.4, 0, 0.2, 1) both; }
.score-flash    { animation: scoreFlash 0.8s ease-out; }


/* --------------------------------------------------------------------------
   15. Utility Helpers
   -------------------------------------------------------------------------- */

.bg-surface-secondary {
    background-color: var(--surface-secondary) !important;
}

.bg-surface-code {
    background-color: var(--surface-code) !important;
}

.text-on-brand {
    color: var(--text-on-brand) !important;
}

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

.empty-state {
    padding: 3rem 1rem;
    text-align: center;
    color: var(--text-muted);
}

.empty-state h5 {
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

/* Smooth scroll */
html {
    scroll-behavior: smooth;
}

/* Selection color */
::selection {
    background-color: rgba(var(--brand-accent-rgb), 0.3);
    color: var(--text-primary);
}


/* --------------------------------------------------------------------------
   16. Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 767.98px) {
    .sidebar-sticky {
        position: static;
        max-height: none;
    }

    .rankings-table th:nth-child(2),
    .rankings-table td:nth-child(2) {
        min-width: 200px;
    }

    .hero-card {
        padding: 1.25rem;
    }

    .hero-card h1 {
        font-size: 1.25rem;
    }
}

@media (min-width: 768px) {
    .container {
        max-width: 1140px;
    }
}

@media (min-width: 1200px) {
    .container {
        max-width: 1280px;
    }
}


/* --------------------------------------------------------------------------
   17. Search input (Metrics admin)
   -------------------------------------------------------------------------- */

.search-input {
    background-color: var(--surface-secondary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: all var(--transition-fast);
    width: 100%;
}

.search-input:focus {
    outline: none;
    border-color: var(--brand-accent);
    box-shadow: 0 0 0 3px rgba(var(--brand-accent-rgb), 0.15);
    background-color: var(--surface-card);
}

.search-input::placeholder {
    color: var(--text-muted);
}


/* --------------------------------------------------------------------------
   18. Button Overrides
   -------------------------------------------------------------------------- */

.btn-accent {
    background-color: var(--brand-accent);
    color: #fff;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.btn-accent:hover {
    background-color: var(--brand-accent-hover);
    color: #fff;
    box-shadow: var(--shadow-accent);
}

.btn-outline-accent {
    background-color: transparent;
    color: var(--brand-accent);
    font-weight: 600;
    border: 1px solid var(--brand-accent);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.btn-outline-accent:hover {
    background-color: var(--brand-accent);
    color: #fff;
}

/* Softer outline for secondary actions */
.btn-ghost {
    background-color: transparent;
    color: var(--text-secondary);
    font-weight: 500;
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    transition: all var(--transition-fast);
}

.btn-ghost:hover {
    border-color: var(--text-secondary);
    color: var(--text-primary);
    background-color: var(--surface-secondary);
}