/* ---------- Design tokens ---------- */

:root {
    --color-bg: #f4f8fb;
    --color-panel-bg: #ffffff;
    --color-surface: #f7fafd;
    --color-surface-soft: #f3f8fc;
    --color-surface-soft-hover: #e3f0fb;

    --color-text: #1a2733;
    --color-text-muted: #5b6b7c;
    --color-text-faint: #8496a8;
    --color-text-on-accent: #ffffff;

    --color-border: #e3edf7;
    --color-border-soft: #dce8f4;
    --color-border-strong: #cbd8e6;

    --color-accent: #1a5f9e;
    --color-accent-strong: #164e82;
    --color-accent-light: #4a90d9;
    --color-accent-tint: #e8f4fd;
    --color-accent-soft: #a9cdec;

    --accent-rgb: 26, 95, 158;
    --accent-light-rgb: 74, 144, 217;
    --shadow-rgb: 15, 45, 74;

    --shadow-panel: 0 2px 12px rgba(var(--shadow-rgb), 0.06);
    --shadow-panel-strong: 0 2px 14px rgba(var(--shadow-rgb), 0.1);

    --font-scale: 1;
}

[data-theme="dark"] {
    --color-bg: #10161d;
    --color-panel-bg: #1a222c;
    --color-surface: #1f2833;
    --color-surface-soft: #232c38;
    --color-surface-soft-hover: #2b3a4a;

    --color-text: #e6edf3;
    --color-text-muted: #9fb0c0;
    --color-text-faint: #7c8ea0;
    --color-text-on-accent: #ffffff;

    --color-border: #2a3644;
    --color-border-soft: #2f3d4c;
    --color-border-strong: #3a4756;

    --color-accent: #5aa6e0;
    --color-accent-strong: #7fbaea;
    --color-accent-light: #5aa6e0;
    --color-accent-tint: #1f3346;
    --color-accent-soft: #3a5b78;

    --accent-rgb: 90, 166, 224;
    --accent-light-rgb: 90, 166, 224;
    --shadow-rgb: 0, 0, 0;

    --shadow-panel: 0 2px 16px rgba(0, 0, 0, 0.5);
    --shadow-panel-strong: 0 2px 18px rgba(0, 0, 0, 0.6);
}

[data-contrast="high"] {
    --color-border: var(--color-text);
    --color-border-soft: var(--color-text);
    --color-border-strong: var(--color-text);
    --color-text-muted: var(--color-text);
    --color-text-faint: var(--color-text);
    --shadow-panel: none;
    --shadow-panel-strong: none;
}

[data-contrast="high"] .filters-panel,
[data-contrast="high"] .graph-panel,
[data-contrast="high"] .range-group,
[data-contrast="high"] .year-chip,
[data-contrast="high"] .columns-checklist-label,
[data-contrast="high"] .range-input,
[data-contrast="high"] .download-link,
[data-contrast="high"] .footer-link,
[data-contrast="high"] .apply-filters-button,
[data-contrast="high"] .a11y-toolbar,
[data-contrast="high"] .a11y-button {
    border-width: 2px;
}

/* ---------- App shell ---------- */

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

#app-shell {
    min-height: 100vh;
    background-color: var(--color-bg);
    color: var(--color-text);
    padding-bottom: 40px;
    transition: background-color 0.2s ease-in-out, color 0.2s ease-in-out;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
[tabindex]:focus-visible {
    outline: 3px solid var(--color-accent-light);
    outline-offset: 2px;
}

/* ---------- Accessibility toolbar ---------- */

.a11y-toolbar {
    position: fixed;
    right: 9px;
    top: 20px;
    z-index: 1000;
    display: flex;
    /* flex-direction: column; */
    gap: 8px;
    padding: 4px;
    background-color: var(--color-panel-bg);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    box-shadow: var(--shadow-panel-strong);
}

.a11y-button {
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    border: 1px solid var(--color-border-strong);
    background-color: var(--color-surface-soft);
    color: var(--color-accent);
    font-size: calc(15px * var(--font-scale));
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.15s ease-in-out, color 0.15s ease-in-out,
        box-shadow 0.15s ease-in-out;
}

.a11y-button:hover {
    background-color: var(--color-accent);
    color: var(--color-text-on-accent);
}

.a11y-button[aria-pressed="true"] {
    background-color: var(--color-accent);
    color: var(--color-text-on-accent);
    box-shadow: 0 0 0 3px rgba(var(--accent-light-rgb), 0.35);
}

/* ---------- Header ---------- */

.app-header {
    text-align: center;
    padding: 36px 20px 8px 20px;
}

.app-title {
    font-size: calc(32px * var(--font-scale));
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -0.01em;
    margin: 0;
}

.app-title-underline {
    width: 64px;
    height: 4px;
    margin: 14px auto 0 auto;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
}

/* ---------- Filters panel ---------- */

.filters-panel {
    /* max-width: 900px; */
    margin: 0 auto 28px auto;
    padding: 24px 32px;
    background-color: var(--color-panel-bg);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    box-shadow: var(--shadow-panel);
    transition: background-color 0.2s ease-in-out, border-color 0.2s ease-in-out;
}

.filters-section {
    margin-bottom: 24px;
    text-align: center;
}

.filters-section:last-of-type {
    margin-bottom: 0;
}

.filters-row {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.filters-row .filters-section {
    margin-bottom: 0;
    flex: 1 1 340px;
}

.filters-section-title {
    font-size: calc(12px * var(--font-scale));
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-accent);
    margin-bottom: 12px;
}

.filters-hint {
    text-align: center;
    font-size: calc(14px * var(--font-scale));
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

/* ---------- Columns checklist ---------- */

.columns-checklist {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 10px 16px;
    width: 100%;
}

.columns-checklist .dash-options-list-option {
    margin: 0 !important;
    min-width: 0;
}

.columns-checklist-label {
    display: flex;
    align-items: center;
    gap: 6px;
    width: 100%;
    box-sizing: border-box;
    padding: 6px 14px;
    border-radius: 999px;
    background-color: var(--color-surface-soft);
    border: 1px solid var(--color-border-soft);
    color: var(--color-text);
    font-size: calc(13.5px * var(--font-scale));
    cursor: pointer;
    transition: background-color 0.15s ease-in-out, border-color 0.15s ease-in-out;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.columns-checklist-label:hover {
    background-color: var(--color-surface-soft-hover);
    border-color: var(--color-accent-soft);
}

.columns-checklist-input {
    accent-color: var(--color-accent);
    cursor: pointer;
}

/* ---------- Date range ---------- */

.date-field {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 10px;
}

.date-field-label {
    font-weight: 700;
    font-size: calc(14px * var(--font-scale));
    color: #1a5f9e;
    white-space: nowrap;
}

/* Dash's native date input (and its calendar popup, including the month/year
   selector) uses `color: inherit`, which otherwise picks up #app-shell's
   theme-varying text color. Reset both so they stay the same regardless of
   light/dark/high-contrast mode. The popup isn't guaranteed to stay inside
   .date-field (it can render through a portal), so it's left unscoped. */
.date-field .dash-datepicker-input {
    color: initial;
}

.dash-datepicker-content {
    color: initial;
}

.year-chip-group {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.year-chip {
    padding: 6px 18px;
    border-radius: 20px;
    border: 1px solid var(--color-accent-light);
    background-color: var(--color-accent-tint);
    color: var(--color-accent);
    font-weight: bold;
    font-size: calc(14px * var(--font-scale));
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(var(--shadow-rgb), 0.08);
    transition: background-color 0.15s ease-in-out, color 0.15s ease-in-out,
        box-shadow 0.15s ease-in-out, transform 0.1s ease-in-out;
}

.year-chip:hover {
    background-color: var(--color-accent-light);
    color: #ffffff;
    box-shadow: 0 2px 6px rgba(var(--accent-light-rgb), 0.4);
}

.year-chip:active {
    transform: translateY(1px);
    box-shadow: 0 1px 2px rgba(var(--shadow-rgb), 0.15);
}

.year-chip.active {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(var(--accent-rgb), 0.5);
}

/* ---------- Run & fill range filters ---------- */

.range-group {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 10px 20px;
}

.range-divider {
    width: 1px;
    align-self: stretch;
    background-color: var(--color-border-strong);
}

.range-subfield {
    display: flex;
    align-items: center;
    gap: 10px;
}

.range-title {
    font-weight: 700;
    color: var(--color-accent);
    font-size: calc(14px * var(--font-scale));
}

.range-inputs {
    display: flex;
    align-items: center;
    gap: 8px;
}

.range-separator {
    color: var(--color-text-faint);
    font-weight: 600;
}

.range-input {
    box-sizing: border-box;
    width: 100px;
    padding: 7px 6px 7px 10px;
    border-radius: 8px;
    border: 1px solid var(--color-border-strong);
    font-size: calc(14px * var(--font-scale));
    color: var(--color-text);
    background-color: var(--color-panel-bg);
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.range-input:focus {
    outline: none;
    border-color: var(--color-accent-light);
    box-shadow: 0 0 0 3px rgba(var(--accent-light-rgb), 0.15);
}

.range-input::-webkit-outer-spin-button,
.range-input::-webkit-inner-spin-button {
    -webkit-appearance: auto;
    opacity: 1;
}

.range-clear-button {
    padding: 6px 14px;
    border-radius: 999px;
    border: 1px solid var(--color-border-strong);
    background-color: transparent;
    color: var(--color-text-muted);
    font-size: calc(13px * var(--font-scale));
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.15s ease-in-out, color 0.15s ease-in-out,
        border-color 0.15s ease-in-out;
}

.range-clear-button:hover {
    background-color: var(--color-surface-soft-hover);
    border-color: var(--color-accent-light);
    color: var(--color-accent);
}

/* Only a width constraint - left with its native Dash appearance otherwise,
   same lesson learned from the date picker. */
.runtype-dropdown {
    min-width: 220px;
}

/* ---------- Actions: apply + downloads ---------- */

.filters-actions {
    text-align: center;
}

.apply-filters-button {
    padding: 12px 36px;
    font-size: calc(16px * var(--font-scale));
    font-weight: 700;
    color: #ffffff;
    background-color: var(--color-accent);
    border: none;
    border-radius: 999px;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(var(--accent-rgb), 0.35);
    transition: background-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out,
        transform 0.1s ease-in-out;
}

.apply-filters-button:hover {
    background-color: var(--color-accent-strong);
    box-shadow: 0 4px 12px rgba(var(--accent-rgb), 0.45);
}

.apply-filters-button:active {
    transform: translateY(1px);
    box-shadow: 0 1px 4px rgba(var(--accent-rgb), 0.3);
}

.download-links {
    display: flex;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
    margin-top: 16px;
}

.download-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    border-radius: 999px;
    background-color: var(--color-accent-tint);
    border: 1px solid var(--color-border-soft);
    color: var(--color-accent);
    font-weight: 600;
    font-size: calc(14px * var(--font-scale));
    text-decoration: none;
    transition: background-color 0.15s ease-in-out, color 0.15s ease-in-out,
        box-shadow 0.15s ease-in-out;
}

.download-link:hover {
    background-color: var(--color-accent);
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(var(--accent-rgb), 0.35);
}

/* ---------- Timeline graph ---------- */

.graph-panel {
    /* max-width: 1200px; */
    margin: 0 auto 28px auto;
    padding: 16px;
    background-color: var(--color-panel-bg);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    box-shadow: var(--shadow-panel);
    transition: background-color 0.2s ease-in-out, border-color 0.2s ease-in-out;
}

/* ---------- Analytics page ---------- */
/* .app-header, .app-title, .app-title-underline, .footer-link and
   .graph-panel above are shared with the main dashboard layout. */

.stat-cards {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    max-width: 1100px;
    margin: 32px auto;
    padding: 0 20px;
}

.stat-card {
    padding: 20px 30px;
    min-width: 140px;
    text-align: center;
    background-color: var(--color-panel-bg);
    border: 1px solid var(--color-border);
    border-radius: 14px;
    box-shadow: var(--shadow-panel);
}

.stat-label {
    font-size: calc(12px * var(--font-scale));
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.stat-value {
    font-size: calc(28px * var(--font-scale));
    font-weight: 800;
    color: var(--color-accent);
}

.charts {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.empty-state {
    max-width: 500px;
    margin: 80px auto;
    padding: 0 20px;
    text-align: center;
}

/* ---------- Footer ---------- */

.app-footer {
    max-width: 900px;
    margin: 32px auto 24px auto;
    padding-top: 20px;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-notes-row {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 18px;
}

.footer-icon {
    font-size: calc(15px * var(--font-scale));
    line-height: 1.7;
}

.footer-notes {
    list-style: none;
    margin: 0;
    padding: 0;
    text-align: left;
    color: var(--color-text-muted);
    font-size: calc(13.5px * var(--font-scale));
    line-height: 1.7;
}

.footer-notes li::before {
    content: "•";
    color: var(--color-accent-soft);
    margin-right: 6px;
}

.footer-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 20px;
    border-radius: 999px;
    border: 1px solid var(--color-accent);
    background-color: transparent;
    color: var(--color-accent);
    font-weight: 600;
    font-size: calc(14px * var(--font-scale));
    text-decoration: none;
    transition: background-color 0.15s ease-in-out, color 0.15s ease-in-out,
        box-shadow 0.15s ease-in-out;
}

.footer-link:hover {
    background-color: var(--color-accent);
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(var(--accent-rgb), 0.35);
}