/* SENSBOOK visual tokens. Sources and component guidance: SENSBOOK_WEB_DESIGN_GUIDE.md. */
:root {
    color-scheme: light;
    --sensbook-primary: #243e70;
    --sensbook-navigation: #1e3662;
    --sensbook-selection: #315284;
    --sensbook-hover: #364760;
    --sensbook-accent: #ffbe0b;
    --sensbook-background: #f7f7f7;
    --sensbook-surface: #ffffff;
    --sensbook-surface-alt: #fbfdff;
    --sensbook-input: #ffffff;
    --sensbook-border: #dce3ec;
    --sensbook-text-primary: #243247;
    --sensbook-text-secondary: #64748b;
    --sensbook-heading: #203b68;
    --sensbook-disabled: #64748b;
    --sensbook-link: #243e70;
    --sensbook-focus: #315284;
    --sensbook-table-header: #eaf0f7;
    --sensbook-table-selection: #e9f3fe;
    --sensbook-success: #22533b;
    --sensbook-success-bg: #e9f3fe;
    --sensbook-warning: #644920;
    --sensbook-warning-bg: #fff1f2;
    --sensbook-error: #682c31;
    --sensbook-error-bg: #fff1f2;
    --sensbook-font: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    --sensbook-radius: .5rem;
    --sensbook-radius-sm: .375rem;
    --sensbook-space-xs: .25rem;
    --sensbook-space-sm: .5rem;
    --sensbook-space-md: 1rem;
    --sensbook-space-lg: 1.5rem;
    --sensbook-space-xl: 2rem;
    --sensbook-space-2xl: 3rem;
    --sensbook-shadow: 0 2px 8px rgb(30 54 98 / 6%);
    --sensbook-header-height: 4.5rem;
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --sensbook-background: #1e1e1e;
    --sensbook-surface: #252526;
    --sensbook-surface-alt: #252526;
    --sensbook-input: #2d2d30;
    --sensbook-border: #3f3f46;
    --sensbook-text-primary: #f3f4f6;
    --sensbook-text-secondary: #c7c9ce;
    --sensbook-heading: #f3f4f6;
    --sensbook-disabled: #91949c;
    --sensbook-link: #8fb9f1;
    --sensbook-focus: #8fb9f1;
    --sensbook-table-header: #252526;
    --sensbook-table-selection: #315284;
    --sensbook-success: #83d3a1;
    --sensbook-success-bg: #22533b;
    --sensbook-warning: #f0c36d;
    --sensbook-warning-bg: #644920;
    --sensbook-error: #ff9797;
    --sensbook-error-bg: #682c31;
    --sensbook-shadow: 0 2px 8px rgb(0 0 0 / 16%);
}

* { box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; scroll-padding-top: calc(var(--sensbook-header-height) + 1rem); }
body { margin: 0; background: var(--sensbook-background); color: var(--sensbook-text-primary); font-family: var(--sensbook-font); line-height: 1.6; }
button, input, select, textarea { font: inherit; }
img, svg { max-width: 100%; }
img { height: auto; }
h1, h2, h3, h4 { color: var(--sensbook-heading); font-weight: 700; line-height: 1.25; }
h1 { font-size: clamp(1.75rem, 3vw, 2.5rem); }
h2 { font-size: clamp(1.375rem, 2vw, 1.75rem); }
h3 { font-size: 1.125rem; }
p { margin-top: 0; }
a { color: var(--sensbook-link); text-underline-offset: .2em; }
a:hover { color: var(--sensbook-link); }
:focus-visible { outline: 3px solid var(--sensbook-focus); outline-offset: 3px; }
::selection { background: var(--sensbook-selection); color: #f3f4f6; }
[hidden] { display: none !important; }
.text-muted, .sensbook-muted { color: var(--sensbook-text-secondary) !important; }
.text-danger, .field-validation-error, .validation-summary-errors { color: var(--sensbook-error) !important; }
.border-top, .border-bottom { border-color: var(--sensbook-border) !important; }

.sensbook-card, .card {
    color: var(--sensbook-text-primary);
    background: var(--sensbook-surface);
    border: 1px solid var(--sensbook-border);
    border-radius: var(--sensbook-radius);
    box-shadow: var(--sensbook-shadow);
}
.sensbook-card { padding: var(--sensbook-space-lg); }
.sensbook-metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 12rem), 1fr)); gap: var(--sensbook-space-md); }
.sensbook-metric-value { font-size: 2rem; font-weight: 700; line-height: 1.25; color: var(--sensbook-heading); }

.sensbook-button, .signin-btn, .btn-primary, .btn-secondary, .btn-outline-primary {
    display: inline-flex; justify-content: center; align-items: center; gap: .5rem;
    min-height: 2.75rem; padding: .625rem 1.125rem;
    border: 1px solid transparent; border-radius: var(--sensbook-radius-sm);
    font-weight: 600; line-height: 1.3; text-align: center; text-decoration: none;
    cursor: pointer; transition: background-color .15s, border-color .15s;
}
.sensbook-button, .signin-btn, .btn-primary { background: var(--sensbook-primary); border-color: var(--sensbook-primary); color: #f3f4f6; }
.sensbook-button:hover, .signin-btn:hover, .btn-primary:hover { background: var(--sensbook-selection); border-color: var(--sensbook-selection); color: #f3f4f6; }
.sensbook-button--secondary, .btn-secondary, .btn-outline-primary { background: var(--sensbook-surface); border-color: var(--sensbook-border); color: var(--sensbook-text-primary); }
.sensbook-button--secondary:hover, .btn-secondary:hover, .btn-outline-primary:hover { background: var(--sensbook-table-header); border-color: var(--sensbook-focus); color: var(--sensbook-text-primary); }
.sensbook-button--danger { background: var(--sensbook-error-bg); color: var(--sensbook-error); border-color: var(--sensbook-error); }
.sensbook-button--danger:hover { background: var(--sensbook-error-bg); color: var(--sensbook-error); border-color: var(--sensbook-error); }
button:disabled, .btn:disabled, [aria-disabled="true"] { cursor: not-allowed; opacity: .65; }
.btn:focus, .btn:active:focus, .form-control:focus, .form-select:focus, .form-check-input:focus { box-shadow: none; }

label { color: var(--sensbook-text-primary); font-weight: 600; }
.form-control, .form-select, .sensbook-input {
    width: 100%; min-height: 2.75rem; padding: .625rem .75rem;
    color: var(--sensbook-text-primary); background-color: var(--sensbook-input);
    border: 1px solid var(--sensbook-border); border-radius: var(--sensbook-radius-sm);
}
.form-control:focus, .form-select:focus, .sensbook-input:focus { color: var(--sensbook-text-primary); background-color: var(--sensbook-input); border-color: var(--sensbook-focus); outline: 2px solid var(--sensbook-focus); outline-offset: 2px; }
.form-control::placeholder, .sensbook-input::placeholder { color: var(--sensbook-text-secondary); opacity: 1; }
.form-control:disabled, .form-control[readonly], .form-select:disabled { background-color: var(--sensbook-surface-alt); color: var(--sensbook-disabled); }
.input-validation-error, [aria-invalid="true"] { border-color: var(--sensbook-error); }
.field-validation-error, .validation-summary-errors { font-size: .875rem; }

.sensbook-table-wrap, .table-responsive { max-width: 100%; overflow-x: auto; border: 1px solid var(--sensbook-border); border-radius: var(--sensbook-radius); }
.table {
    --bs-table-color: var(--sensbook-text-primary); --bs-table-bg: var(--sensbook-surface);
    --bs-table-striped-color: var(--sensbook-text-primary); --bs-table-striped-bg: var(--sensbook-surface-alt);
    --bs-table-hover-color: var(--sensbook-text-primary); --bs-table-hover-bg: var(--sensbook-table-selection);
    color: var(--sensbook-text-primary); border-color: var(--sensbook-border); margin-bottom: 0; min-width: 40rem;
}
.table > thead { background: var(--sensbook-table-header); color: var(--sensbook-heading); }
.table > :not(caption) > * > * { padding: .875rem 1rem; border-color: var(--sensbook-border); }
.table a { font-weight: 600; }
.pagination { gap: .25rem; flex-wrap: wrap; }
.page-link { background: var(--sensbook-surface); color: var(--sensbook-link); border-color: var(--sensbook-border); }
.page-link:hover { background: var(--sensbook-table-header); color: var(--sensbook-link); border-color: var(--sensbook-border); }
.page-item.active .page-link { background: var(--sensbook-selection); border-color: var(--sensbook-selection); color: #f3f4f6; }
.page-item.disabled .page-link { background: var(--sensbook-surface-alt); color: var(--sensbook-disabled); border-color: var(--sensbook-border); }
.sensbook-status { display: inline-block; padding: .25rem .625rem; border: 1px solid currentColor; border-radius: var(--sensbook-radius-sm); font-size: .8125rem; font-weight: 600; }
.sensbook-status--available { color: var(--sensbook-success); background: var(--sensbook-success-bg); }
.sensbook-status--overdue { color: var(--sensbook-warning); background: var(--sensbook-warning-bg); }
.sensbook-status--unavailable { color: var(--sensbook-error); background: var(--sensbook-error-bg); }

.theme-toggle { display: none; gap: .5rem; align-items: center; justify-content: center; min-height: 2.75rem; padding: .5rem .75rem; border: 1px solid var(--sensbook-border); border-radius: var(--sensbook-radius-sm); color: var(--sensbook-text-primary); background: var(--sensbook-surface); cursor: pointer; font-size: .875rem; }
.js .theme-toggle { display: inline-flex; }
.theme-toggle svg { width: 1.125rem; height: 1.125rem; flex: none; }
.theme-toggle[aria-pressed="true"] { border-color: var(--sensbook-focus); }
.theme-state { font-size: .75rem; color: var(--sensbook-text-secondary); }
.skip-link { position: absolute; left: 1rem; top: -6rem; z-index: 100; padding: .75rem 1rem; color: var(--sensbook-text-primary); background: var(--sensbook-surface); border: 2px solid var(--sensbook-focus); }
.skip-link:focus { top: .5rem; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition: none !important; } }