:root {
    --app-ink: #172033;
    --app-muted: #697386;
    --app-border: #dfe5ee;
    --app-soft: #f6f8fb;
    --app-panel: #ffffff;
    --app-primary: #2357d8;
    --app-primary-dark: #183ea1;
    --app-success: #16845b;
    --app-warning: #b86a08;
    --app-danger: #bc2f2f;
    --app-shadow: 0 16px 38px rgba(23, 32, 51, .08);
    --app-soft-shadow: 0 10px 28px rgba(23, 32, 51, .05);

    --app-body-bg: linear-gradient(180deg, #f3f7fb 0, #ffffff 340px);
    --app-navbar-bg: rgba(255, 255, 255, .94);
    --app-nav-hover-bg: #f2f5f9;
    --app-table-head-bg: #f8fafc;
    --app-table-hover-bg: #f8fbff;
    --app-table-border: #edf1f6;
    --app-card-header-bg: #f8fafc;
    --app-progress-bg: #e9eef5;
    --app-avatar-ring: #ffffff;
    --app-input-bg: #ffffff;
    --app-input-color: var(--app-ink);
    --app-dropdown-bg: #ffffff;
    --app-alert-warning-bg: #fff7e8;
    --app-alert-warning-border: #f2d3a1;
    --app-alert-warning-color: #704400;
    --app-divider: rgba(105, 115, 134, .1);
}

[data-theme="dark"] {
    --app-ink: #e6e8ec;
    --app-muted: #9ba3b3;
    --app-border: #2a3142;
    --app-soft: #1a1f2b;
    --app-panel: #1f2531;
    --app-primary: #5b8def;
    --app-primary-dark: #2357d8;
    --app-success: #2ea97a;
    --app-warning: #e0962a;
    --app-danger: #e25a5a;
    --app-shadow: 0 16px 38px rgba(0, 0, 0, .45);
    --app-soft-shadow: 0 10px 28px rgba(0, 0, 0, .35);

    --app-body-bg: linear-gradient(180deg, #0f1320 0, #161b27 340px);
    --app-navbar-bg: rgba(20, 25, 36, .94);
    --app-nav-hover-bg: #232a3a;
    --app-table-head-bg: #232a3a;
    --app-table-hover-bg: #262d40;
    --app-table-border: #2a3142;
    --app-card-header-bg: #232a3a;
    --app-progress-bg: #2a3142;
    --app-avatar-ring: #2a3142;
    --app-input-bg: #161b27;
    --app-input-color: var(--app-ink);
    --app-dropdown-bg: #1f2531;
    --app-alert-warning-bg: #3a2a10;
    --app-alert-warning-border: #6b4a18;
    --app-alert-warning-color: #f0c789;
    --app-divider: rgba(155, 163, 179, .14);

    color-scheme: dark;
}

body {
    background: var(--app-body-bg);
    color: var(--app-ink);
}

.navbar {
    backdrop-filter: blur(14px);
}

.navbar.bg-white {
    background: var(--app-navbar-bg) !important;
}

.navbar.box-shadow,
.navbar.border-bottom {
    border-color: var(--app-border) !important;
    box-shadow: 0 10px 30px rgba(23, 32, 51, .08);
}

.navbar-brand {
    color: var(--app-ink) !important;
    font-weight: 800;
    letter-spacing: 0;
}

.navbar .nav-link {
    border-radius: 8px;
    color: var(--app-muted) !important;
    font-weight: 700;
    margin: 0 2px;
    padding-left: 10px;
    padding-right: 10px;
}

.navbar .nav-link:hover,
.navbar .nav-link:focus {
    background: var(--app-nav-hover-bg);
    color: var(--app-primary) !important;
}

main[role="main"] > div:not(.app-page):not(.modal):not(.main-container) {
    padding: 18px 0 34px;
}

main[role="main"] h3 {
    color: var(--app-ink);
    font-size: clamp(1.38rem, 2.4vw, 2rem);
    font-weight: 650;
    letter-spacing: 0;
    line-height: 1.16;
    margin: 22px 0 10px;
}

main[role="main"] > h3:first-of-type {
    margin-top: 40px;
}

main[role="main"] h4,
main[role="main"] h5 {
    color: var(--app-ink);
    font-weight: 650;
    letter-spacing: 0;
}

hr {
    border: 0;
    border-top: 1px solid rgba(105, 115, 134, .1);
    color: rgba(105, 115, 134, .1);
    margin: 18px 0;
    opacity: 1;
}

main[role="main"] a {
    color: var(--app-primary);
    font-weight: 700;
    text-decoration: none;
}

main[role="main"] a:hover {
    color: var(--app-primary-dark);
    text-decoration: underline;
}

main[role="main"] a.btn,
main[role="main"] a.btn:hover,
main[role="main"] a.btn:focus {
    text-decoration: none;
}

main[role="main"] a.btn-primary,
main[role="main"] a.btn-primary:hover,
main[role="main"] a.btn-primary:focus,
.app-surface a.btn-primary,
.app-surface a.btn-primary:hover,
.app-surface a.btn-primary:focus {
    color: #ffffff;
}

main[role="main"] a.btn-outline-primary:hover,
main[role="main"] a.btn-outline-primary:focus,
.app-surface a.btn-outline-primary:hover,
.app-surface a.btn-outline-primary:focus {
    color: #ffffff;
}

main[role="main"] label {
    color: var(--app-muted);
    font-size: .84rem;
    font-weight: 800;
    margin-bottom: 6px;
}

main[role="main"] .form-control,
main[role="main"] .form-select {
    border-color: var(--app-border);
    border-radius: 8px;
    min-height: 40px;
}

main[role="main"] textarea.form-control {
    min-height: 110px;
}

main[role="main"] .form-control:focus,
main[role="main"] .form-select:focus {
    border-color: rgba(35, 87, 216, .6);
    box-shadow: 0 0 0 .22rem rgba(35, 87, 216, .12);
}

main[role="main"] .btn {
    border-radius: 8px;
    font-weight: 700;
}

main[role="main"] .btn-primary {
    background: var(--app-primary);
    border-color: var(--app-primary);
}

main[role="main"] .btn-primary:hover {
    background: var(--app-primary-dark);
    border-color: var(--app-primary-dark);
}

main[role="main"] .btn-success {
    background: var(--app-success);
    border-color: var(--app-success);
}

main[role="main"] .btn-danger {
    background: var(--app-danger);
    border-color: var(--app-danger);
}

main[role="main"] .btn-info {
    background: #dff3ff;
    border-color: #b7e4fb;
    color: #145070;
}

main[role="main"] .btn-warning {
    background: #fff1d6;
    border-color: #f2ca81;
    color: #704400;
}

main[role="main"] .card {
    border: 1px solid var(--app-border);
    border-radius: 8px;
    box-shadow: var(--app-soft-shadow);
    overflow: hidden;
}

main[role="main"] .card-header {
    background: var(--app-card-header-bg);
    border-bottom: 1px solid var(--app-border);
    color: var(--app-ink);
    font-weight: 800;
}

main[role="main"] .card-body {
    padding: 20px;
}

main[role="main"] .table-responsive {
    background: var(--app-panel);
    border: 1px solid var(--app-border);
    border-radius: 8px;
    box-shadow: var(--app-shadow);
    overflow: auto;
}

main[role="main"] .table {
    margin: 0;
    vertical-align: middle;
}

main[role="main"] .table > :not(caption) > * > * {
    border-color: var(--app-table-border);
    padding: 14px 16px;
}

main[role="main"] .table thead th {
    background: var(--app-table-head-bg);
    border-bottom: 1px solid var(--app-border);
    color: var(--app-muted);
    font-size: .78rem;
    font-weight: 800;
    text-transform: uppercase;
}

main[role="main"] .table-hover tbody tr:hover {
    background: var(--app-table-hover-bg);
}

main[role="main"] .progress {
    background-color: var(--app-progress-bg);
    border-radius: 999px;
    height: 8px;
    margin-top: 6px;
    overflow: hidden;
}

main[role="main"] .progress-bar {
    background: linear-gradient(90deg, #1f7a5c, #2f6eea);
    border-radius: 999px;
}

.page-actions {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.page-filter-links {
    align-items: center;
    background: var(--app-panel);
    border: 1px solid var(--app-border);
    border-radius: 8px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 12px 14px;
}

.page-count {
    background: var(--app-panel);
    border: 1px solid var(--app-border);
    border-radius: 8px;
    box-shadow: var(--app-soft-shadow);
    color: var(--app-ink);
    display: inline-flex;
    font-size: .95rem;
    font-weight: 800;
    padding: 12px 14px;
}

.auth-page {
    align-items: center;
    display: flex;
    min-height: calc(100vh - 120px);
    padding: 32px 0;
}

.auth-panel {
    background: var(--app-panel);
    border: 1px solid var(--app-border);
    border-radius: 8px;
    box-shadow: var(--app-shadow);
    margin: 0 auto;
    max-width: 520px;
    padding: 42px;
    width: 100%;
}

.auth-logo {
    display: block;
    margin: 0 auto 28px;
    max-width: 100%;
}

/* Page shell */
.app-page {
    padding: 18px 0 34px;
}

.app-hero {
    align-items: end;
    border-bottom: 1px solid rgba(105, 115, 134, .1);
    display: grid;
    gap: 24px;
    grid-template-columns: minmax(0, 1fr) auto;
    padding: 28px 0 24px;
}

.app-kicker {
    color: var(--app-primary);
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .08em;
    margin-bottom: 8px;
    text-transform: uppercase;
}

.app-title {
    color: var(--app-ink);
    font-size: clamp(1.85rem, 3.5vw, 3rem);
    font-weight: 650;
    letter-spacing: 0;
    line-height: 1.08;
    margin: 0;
}

.app-subtitle {
    color: var(--app-muted);
    font-size: 1rem;
    margin: 12px 0 0;
    max-width: 760px;
}

.app-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: flex-end;
}

.app-actions .btn,
.app-toolbar .btn {
    align-items: center;
    border-radius: 8px;
    display: inline-flex;
    font-weight: 700;
    gap: 8px;
    min-height: 42px;
    padding: 10px 14px;
}

.app-actions .btn-primary,
.app-toolbar .btn-primary {
    background: var(--app-primary);
    border-color: var(--app-primary);
    box-shadow: 0 10px 20px rgba(35, 87, 216, .18);
}

.app-actions .btn-primary:hover,
.app-toolbar .btn-primary:hover {
    background: var(--app-primary-dark);
    border-color: var(--app-primary-dark);
}

/* Metrics */
.metric-grid {
    display: grid;
    gap: 14px;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin: 22px 0;
}

.metric-card {
    background: var(--app-panel);
    border: 1px solid var(--app-border);
    border-radius: 8px;
    box-shadow: var(--app-soft-shadow);
    min-height: 118px;
    padding: 18px;
}

.metric-label {
    align-items: center;
    color: var(--app-muted);
    display: flex;
    font-size: .82rem;
    font-weight: 700;
    gap: 8px;
    margin-bottom: 12px;
}

.metric-label i {
    color: var(--app-primary);
    font-size: 1rem;
}

.metric-value {
    color: var(--app-ink);
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
}

.metric-note {
    color: var(--app-muted);
    font-size: .86rem;
    margin-top: 10px;
}

.metric-card.is-danger .metric-label i,
.metric-card.is-danger .metric-value {
    color: var(--app-danger);
}

.metric-card.is-success .metric-label i,
.metric-card.is-success .metric-value {
    color: var(--app-success);
}

/* Sections */
.app-section {
    margin-top: 26px;
}

.app-section-header {
    align-items: center;
    display: flex;
    gap: 16px;
    justify-content: space-between;
    margin-bottom: 14px;
}

.app-section-title {
    align-items: center;
    color: var(--app-ink);
    display: flex;
    font-size: 1.25rem;
    font-weight: 650;
    gap: 10px;
    margin: 0;
}

.app-section-title i {
    color: var(--app-primary);
    font-size: 1.05rem;
}

.app-section-meta {
    color: var(--app-muted);
    font-size: .9rem;
    margin: 6px 0 0;
}

.app-surface {
    background: var(--app-panel);
    border: 1px solid var(--app-border);
    border-radius: 8px;
    box-shadow: var(--app-shadow);
    overflow: hidden;
}

/* Alerts */
.app-alert {
    align-items: center;
    border-radius: 8px;
    display: flex;
    gap: 12px;
    margin: 0;
    padding: 14px 16px;
}

.app-alert i {
    font-size: 1.25rem;
}

.app-alert-warning {
    background: var(--app-alert-warning-bg);
    border: 1px solid var(--app-alert-warning-border);
    color: var(--app-alert-warning-color);
}

.app-alert-warning i {
    color: var(--app-warning);
}

.app-alert-warning a {
    color: #875100;
    font-weight: 800;
}

/* Toolbars and forms */
.app-toolbar {
    align-items: center;
    display: grid;
    gap: 14px;
    grid-template-columns: minmax(240px, 1fr) auto;
    margin-bottom: 14px;
}

.app-search {
    position: relative;
}

.app-search i {
    color: var(--app-muted);
    left: 14px;
    pointer-events: none;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
}

.app-search .form-control {
    border: 1px solid var(--app-border);
    border-radius: 8px;
    min-height: 44px;
    padding-left: 42px;
}

.app-search .form-control:focus {
    border-color: rgba(35, 87, 216, .6);
    box-shadow: 0 0 0 .22rem rgba(35, 87, 216, .12);
}

.app-toolbar .btn-group {
    gap: 10px;
}

.app-toolbar .btn-group > .btn {
    border-radius: 8px !important;
}

/* Table surfaces */
.app-surface .alert {
    border: 0;
    border-radius: 0;
    margin: 0;
    padding: 16px 18px;
}

.app-surface .alert-success {
    background: #eaf8f1;
    color: #116545;
}

.app-surface .alert-warning {
    background: #fff3df;
    color: #805000;
}

.app-surface .table-responsive {
    margin: 0;
}

.app-surface .table {
    margin: 0;
    vertical-align: middle;
}

.app-surface .table > :not(caption) > * > * {
    border-color: var(--app-table-border);
    padding: 14px 16px;
}

.app-surface .table thead th {
    background: var(--app-table-head-bg);
    border-bottom: 1px solid var(--app-border);
    color: var(--app-muted);
    font-size: .78rem;
    font-weight: 800;
    text-transform: uppercase;
}

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

.app-surface a {
    color: var(--app-primary);
    font-weight: 700;
    text-decoration: none;
}

.app-surface a:hover {
    color: var(--app-primary-dark);
    text-decoration: underline;
}

.app-surface .progress {
    background-color: var(--app-progress-bg);
    border-radius: 999px;
    height: 8px;
    margin-top: 6px;
    overflow: hidden;
}

.app-surface .progress-bar {
    background: linear-gradient(90deg, #1f7a5c, #2f6eea);
    border-radius: 999px;
}

.app-surface .form-control,
.app-surface .form-select {
    border-color: var(--app-border);
    border-radius: 8px;
    min-height: 38px;
}

/* Avatars */
.letter-avatar,
.avatar-big {
    border: 2px solid var(--app-avatar-ring);
    box-shadow: 0 8px 18px rgba(23, 32, 51, .16);
}

.letter-avatar {
    align-items: center;
    background-color: var(--app-success);
    border-radius: 50%;
    color: white;
    display: inline-flex;
    font-size: .95rem;
    font-weight: 800;
    height: 50px;
    justify-content: center;
    line-height: 1;
    text-align: center;
    vertical-align: middle;
    width: 50px;
}

main[role="main"] .table .letter-avatar {
    display: inline-flex;
    font-size: .82rem;
    height: 36px;
    line-height: 1;
    width: 36px;
}

main[role="main"] .table .avatar {
    border: 2px solid var(--app-avatar-ring);
    box-shadow: 0 8px 18px rgba(23, 32, 51, .14);
    height: 36px;
    width: 36px;
}

@media (max-width: 992px) {
    .app-hero,
    .app-toolbar {
        grid-template-columns: 1fr;
    }

    .app-actions {
        justify-content: flex-start;
    }

    .metric-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 576px) {
    .app-page {
        padding-top: 8px;
    }

    .app-hero {
        padding-top: 18px;
    }

    .metric-grid {
        grid-template-columns: 1fr;
    }

    .app-section-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .app-toolbar .btn-group,
    .app-toolbar .btn {
        width: 100%;
    }

    .app-toolbar .btn-group {
        display: grid;
        grid-template-columns: 1fr;
    }
}

/* Theme toggle button */
.theme-toggle {
    align-items: center;
    background: var(--app-panel);
    border: 1px solid var(--app-border);
    border-radius: 50%;
    color: var(--app-ink);
    display: inline-flex;
    height: 42px;
    justify-content: center;
    padding: 0;
    transition: background .15s ease, color .15s ease, transform .15s ease;
    width: 42px;
}

.theme-toggle:hover,
.theme-toggle:focus {
    background: var(--app-nav-hover-bg);
    color: var(--app-primary);
    transform: translateY(-1px);
}

.theme-toggle i {
    font-size: 1.1rem;
    line-height: 1;
}

/* Dark mode: cover Bootstrap surfaces that don't already read CSS vars */
[data-theme="dark"] .navbar-brand,
[data-theme="dark"] .navbar .nav-link.text-dark,
[data-theme="dark"] .navbar-brand a {
    color: var(--app-ink) !important;
}

[data-theme="dark"] .navbar.box-shadow,
[data-theme="dark"] .navbar.border-bottom {
    border-color: var(--app-border) !important;
    box-shadow: 0 10px 30px rgba(0, 0, 0, .45);
}

[data-theme="dark"] .navbar-toggler {
    border-color: var(--app-border);
}

[data-theme="dark"] .navbar-toggler-icon {
    filter: invert(1) brightness(1.6);
}

[data-theme="dark"] .dropdown-menu {
    background-color: var(--app-dropdown-bg);
    border-color: var(--app-border);
}

[data-theme="dark"] .dropdown-item {
    color: var(--app-ink);
}

[data-theme="dark"] .dropdown-item:hover,
[data-theme="dark"] .dropdown-item:focus {
    background-color: var(--app-nav-hover-bg);
    color: var(--app-primary);
}

[data-theme="dark"] main[role="main"] .form-control,
[data-theme="dark"] main[role="main"] .form-select,
[data-theme="dark"] .app-surface .form-control,
[data-theme="dark"] .app-surface .form-select,
[data-theme="dark"] .app-search .form-control {
    background-color: var(--app-input-bg);
    color: var(--app-input-color);
}

[data-theme="dark"] main[role="main"] .form-control::placeholder,
[data-theme="dark"] .app-search .form-control::placeholder {
    color: var(--app-muted);
    opacity: .8;
}

[data-theme="dark"] .footer.text-muted,
[data-theme="dark"] footer.text-muted {
    color: var(--app-muted) !important;
}

[data-theme="dark"] .modal-content {
    background-color: var(--app-panel);
    color: var(--app-ink);
}

[data-theme="dark"] .modal-header,
[data-theme="dark"] .modal-footer {
    border-color: var(--app-border);
}

[data-theme="dark"] .modal-header .btn-close {
    filter: invert(1) grayscale(100%) brightness(1.4);
}

[data-theme="dark"] hr {
    border-top-color: var(--app-divider);
    color: var(--app-divider);
}

[data-theme="dark"] .card {
    background-color: var(--app-panel);
    color: var(--app-ink);
}

[data-theme="dark"] .list-group-item {
    background-color: var(--app-panel);
    border-color: var(--app-border);
    color: var(--app-ink);
}

[data-theme="dark"] main[role="main"] .btn-info {
    background: #1a3a52;
    border-color: #2a5a7a;
    color: #cfe7f5;
}

[data-theme="dark"] main[role="main"] .btn-warning {
    background: #4a3514;
    border-color: #6b4a18;
    color: #f0c789;
}