/* ── CSS Custom Properties ───────────────────────────────────────────────────
   Single source of truth for all colors and design tokens.
   Centralising here means changing one value updates the whole dashboard.
   Colors mirror dashboard/design_tokens.py — update both files together.      */
:root {
    --bg-base:          #0f1117;  /* near-black    — outermost page canvas      */
    --bg-surface:       #1a1d27;  /* dark navy      — cards, chart panels       */
    --bg-elevated:      #222638;  /* dark slate-blue — table headers, nav bar   */
    --bg-hover:         #2a2f45;  /* muted indigo   — row hover, active states  */
    --text-primary:     #e2e8f0;  /* soft white     — body and heading text     */
    --text-secondary:   #8892a4;  /* cool gray      — labels, subtitles         */
    --text-muted:       #4a5568;  /* charcoal       — placeholders, disabled    */
    --accent-blue:      #3b82f6;  /* cornflower blue — links, primary action    */
    --accent-blue-bright: #60a5fa; /* sky blue      — button hover, active      */
    --accent-green:     #10b981;  /* emerald green  — Net Income bars           */
    --accent-amber-dim: rgba(245, 158, 11, 0.15); /* translucent amber — stale row tint  */
    --accent-red-dim:   rgba(239,  68, 68, 0.15); /* translucent red   — anomaly row tint */
    --border:           #2d3348;  /* dark steel     — table cell dividers       */
    --border-light:     #374160;  /* slate          — nav/header borders        */
    --radius:           8px;      /* standard corner radius for cards/tables    */
    --radius-sm:        4px;      /* small corner radius for buttons/dropdowns  */
    --shadow:           0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* ── Global Reset ────────────────────────────────────────────────────────────
   Remove browser default margins/padding and enforce border-box sizing.       */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Set the page-wide dark background, cross-platform system font stack,
   and base text colour so every element inherits sane defaults.               */
body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    /* system-ui resolves to the native OS font: Segoe UI on Windows,
       San Francisco on macOS, Roboto on Android — no external request needed. */
    font-family: system-ui, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;  /* crisper text on high-DPI screens  */
}

/* ── Page Wrapper ────────────────────────────────────────────────────────────
   Mirrors the old inline maxWidth/margin/padding on each layout's root Div.   */
.dash-page {
    max-width: 1100px;
    margin: 0 auto;
    padding: 32px 24px;
}

/* ── Navigation Bar ──────────────────────────────────────────────────────────
   Flexbox row holding the page title area on the left and the nav link
   on the right; bottom border acts as a visual separator from the content.    */
.dash-nav {
    display: flex;
    align-items: center;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 24px;
}

/* Style the inter-dashboard navigation link as a pill button. */
.dash-nav__link {
    color: var(--accent-blue);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.01em;
    padding: 6px 12px;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    transition: background-color 0.15s, border-color 0.15s;
}

/* Highlight the nav link on hover to signal it is interactive.               */
.dash-nav__link:hover {
    background-color: var(--bg-hover);
    border-color: var(--accent-blue);
    color: var(--accent-blue-bright);
}

/* ── Typography ──────────────────────────────────────────────────────────────*/

/* Page title — removes the old inline color style from html.H1.              */
h1 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    margin-bottom: 6px;
}

/* Section heading — replaces inline color + marginTop on html.H2.            */
h2 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    margin-bottom: 8px;
}

/* Muted descriptive text below headings — replaces inline gray color on P.   */
.dash-subtitle {
    color: var(--text-secondary);
    font-size: 13px;
    margin-bottom: 20px;
}

/* Horizontal rule separator — replaces the default browser grey border.      */
hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 28px 0;
}

/* ── Labels ──────────────────────────────────────────────────────────────────
   Uppercase, letter-spaced label style for form elements like the dropdown.  */
label {
    display: block;
    color: var(--text-secondary);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 6px;
}

/* ── Buttons ─────────────────────────────────────────────────────────────────
   Replaces the bare html.Button styling on Refresh Anomalies / Refresh Weather. */
.dash-btn {
    background-color: var(--bg-elevated);
    color: var(--accent-blue-bright);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    padding: 8px 16px;
    font-family: inherit;  /* inherit body font stack so the button matches     */
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    letter-spacing: 0.01em;
    transition: background-color 0.15s, border-color 0.15s;
    margin-bottom: 16px;
}

/* Subtle background shift on hover provides affordance without being harsh.  */
.dash-btn:hover {
    background-color: var(--bg-hover);
    border-color: var(--accent-blue);
}

/* Fill with accent colour on active/click press for tactile feedback.        */
.dash-btn:active {
    background-color: var(--accent-blue);
    color: #ffffff;  /* pure white — high contrast on the blue fill            */
}

/* ── Data Tables ─────────────────────────────────────────────────────────────
   Base class applied to html.Table in all four table-builder functions.       */
.dash-table {
    border-collapse: collapse;
    width: 100%;
    background-color: var(--bg-surface);
    border-radius: var(--radius);
    overflow: hidden;  /* clips cells so border-radius shows on the table      */
    box-shadow: var(--shadow);
    margin-top: 16px;
}

/* Styled header cells: uppercase, small, secondary-color, elevated background. */
.dash-table th {
    background-color: var(--bg-elevated);
    color: var(--text-secondary);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-light);
    text-align: left;
    white-space: nowrap;  /* prevent header text from wrapping on narrow screens */
}

/* Base data cell — consistent padding, subtle bottom border, tabular numbers. */
.dash-table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
    font-size: 13px;
    font-variant-numeric: tabular-nums;  /* aligns numeric columns on their decimal point */
}

/* Remove the bottom border on the last row to avoid a double-border effect.  */
.dash-table tbody tr:last-child td {
    border-bottom: none;
}

/* Alternate row stripe: every even row gets a slightly elevated background.  */
.dash-table tbody tr:nth-child(even) td {
    background-color: var(--bg-elevated);
}

/* Row hover highlight — works across both striped and unstriped rows.        */
.dash-table tbody tr:hover td {
    background-color: var(--bg-hover);
}

/* ── State-specific Row Highlighting ─────────────────────────────────────────
   These classes are applied to html.Tr elements by the table builder functions
   and override the alternating-stripe rule via higher specificity (tr.class td
   vs tbody tr:nth-child td).                                                   */

/* Anomaly rows: translucent red tint — replaces inline {"backgroundColor": "#fef2f2"} */
tr.row-anomaly td {
    background-color: var(--accent-red-dim) !important;
}

/* Stale data rows: translucent amber — replaces inline {"backgroundColor": "#fffbeb"} */
tr.row-stale td {
    background-color: var(--accent-amber-dim) !important;
}

/* ── Sortable Column Headers ─────────────────────────────────────────────────
   Applied to html.Th elements in the anomaly tables; class toggled by callbacks. */

/* Pointer cursor + no text selection tells users the header is clickable */
.dash-table th.sortable-header {
    cursor: pointer;
    user-select: none;
}

/* Hover tint matches the row-hover shade for visual consistency */
.dash-table th.sortable-header:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

/* Active sort column highlighted in accent blue so it stands out clearly */
.dash-table th.sorted {
    color: var(--accent-blue-bright);
}

/* Sort glyph (▲ / ▼) sits just to the right of the column label */
.sort-indicator {
    margin-left: 4px;
    font-size: 10px;
}

/* ── × Clear-sort button ──────────────────────────────────────────────────────
   Hidden by default; the render callback adds .sort-active to the table when
   a column is sorted, which makes the button and its placeholder cells appear. */

/* Hidden when no sort is active; wide/tall padding makes it easy to click */
.dash-table th.sort-clear-btn {
    display: none;
    cursor: pointer;
    user-select: none;
    text-align: center;
    font-size: 15px;
    font-weight: 400;
    color: var(--text-secondary);
    padding: 6px 18px;
    transition: color 0.15s, background-color 0.15s;
    white-space: nowrap;
}

/* Show the × header cell when a sort is active */
.dash-table.sort-active th.sort-clear-btn {
    display: table-cell;
}

/* Brighten on hover so the user knows it is clickable */
.dash-table.sort-active th.sort-clear-btn:hover {
    color: var(--text-primary);
    background-color: var(--bg-hover);
}

/* Empty placeholder td — always in the DOM but hidden; revealed alongside the × header */
.dash-table td.sort-clear-cell {
    display: none;
    width: 52px;
    min-width: 52px;
}

/* Show placeholder cells when sort is active so column widths stay aligned */
.dash-table.sort-active td.sort-clear-cell {
    display: table-cell;
}

/* ── Dash Dropdown (React-Select) ────────────────────────────────────────────
   Dash bundles React-Select whose styles are injected with high specificity,
   so !important is required here to override them.                             */

/* Control (the visible input box) — dark background, matching border.        */
.Select-control {
    background-color: var(--bg-elevated) !important;
    border: 1px solid var(--border-light) !important;
    border-radius: var(--radius-sm) !important;
    color: var(--text-primary) !important;
}

/* The floating options panel — dark surface, matching border.                */
.Select-menu-outer {
    background-color: var(--bg-elevated) !important;
    border: 1px solid var(--border-light) !important;
    border-radius: var(--radius-sm) !important;
    box-shadow: var(--shadow) !important;
}

/* Each option item — dark background, primary text colour.                   */
.Select-option {
    background-color: var(--bg-elevated) !important;
    color: var(--text-primary) !important;
}

/* Focused/hovered option — hover shade matches the rest of the UI.           */
.Select-option.is-focused {
    background-color: var(--bg-hover) !important;
}

/* The selected value label rendered inside the control.                       */
.Select-value-label {
    color: var(--text-primary) !important;
}

/* Placeholder text when nothing is selected.                                  */
.Select-placeholder {
    color: var(--text-muted) !important;
}

/* ── Loading Spinner Overlay ─────────────────────────────────────────────────
   Dash's dcc.Loading injects a semi-transparent overlay while callbacks run.
   Override the default white overlay so it blends with the dark background.   */
._dash-loading-callback {
    background-color: rgba(15, 17, 23, 0.6) !important;  /* near-black at 60% opacity */
}

/* ── Spot Interruption Banner ────────────────────────────────────────────────
   Fixed-position toast, bottom-right corner. Persistent — no auto-dismiss.
   display:none by default (set via inline style); callback switches to flex
   when AWS issues a spot termination notice.                                   */

/* Outer container: flex row (icon left, text body right); floats above all content. */
.spot-banner {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;              /* above charts, dropdowns, and Dash loading overlays */
    display: flex;              /* overridden to none via inline style by default      */
    align-items: flex-start;
    gap: 12px;
    max-width: 320px;
    background-color: #1c1810; /* very dark amber-tinted background to match dark theme */
    border: 1px solid rgba(245, 158, 11, 0.55);  /* amber border at medium opacity     */
    border-left: 4px solid #f59e0b;              /* solid amber left accent bar         */
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.55); /* elevated shadow to separate from page */
}

/* Warning sign icon: large, amber, vertically aligned with the title text. */
.spot-banner__icon {
    font-size: 22px;
    color: #f59e0b;             /* amber-400 — matches the accent bar and countdown     */
    flex-shrink: 0;             /* prevents icon from collapsing when body text wraps   */
    padding-top: 2px;           /* optical alignment with the title's cap height         */
}

/* Text column to the right of the icon. */
.spot-banner__body {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

/* Title: short, bold — establishes the visual hierarchy immediately. */
.spot-banner__title {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

/* Subtitle: secondary-color helper text sitting above the countdown. */
.spot-banner__subtitle {
    font-size: 12px;
    color: var(--text-secondary);
    margin: 0;
}

/* Countdown: large, bold, amber — the focal element of the whole banner. */
.spot-banner__countdown {
    font-size: 32px;
    font-weight: 800;
    color: #f59e0b;             /* amber — same as the icon for visual consistency      */
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;  /* digits stay fixed-width so M:SS doesn't jump */
    line-height: 1.1;
    margin: 4px 0;
}

/* Note: smallest text; muted; reassures the user their data is safe. */
.spot-banner__note {
    font-size: 11px;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.4;
}

/* ── Server-Offline Banner ───────────────────────────────────────────────────
   Full-width bar pinned to the top of the viewport. Appears when the browser's
   JS health check (fetch /health) fails — meaning the server is unreachable.
   display:none by default; clientside callback switches to display:flex.        */

/* Outer bar: stretches the full viewport width, sits above all page content. */
.offline-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 9999;              /* above charts, dropdowns, and spot banner      */
    display: flex;              /* overridden to none via inline style by default */
    align-items: center;
    gap: 12px;
    padding: 11px 20px;
    background-color: #1c1810; /* very dark amber-tinted — matches spot banner   */
    border-bottom: 3px solid #f59e0b;  /* amber bottom border — visible accent   */
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

/* Warning icon: amber, slightly larger to draw the eye immediately.            */
.offline-banner__icon {
    font-size: 20px;
    color: #f59e0b;
    flex-shrink: 0;
}

/* Text column: stacks title above the message with a small gap.               */
.offline-banner__body {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

/* Title: bold, primary color — first thing the visitor reads.                 */
.offline-banner__title {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

/* Message: secondary color — softer explanation below the title.              */
.offline-banner__message {
    font-size: 12px;
    color: var(--text-secondary);
    margin: 0;
}

/* ── Color-dot column — non-sortable first column in anomaly tables ──────────
   Narrow, centered — visually matches the Plotly legend swatch size.           */

/* Header: fixed narrow width; default cursor signals it is not clickable. */
.dash-table th.color-dot-header {
    width: 28px;
    min-width: 28px;
    cursor: default;
    padding: 10px 6px;
    text-align: center;
}

/* Prevent hover styles from making this header look interactive. */
.dash-table th.color-dot-header:hover {
    background-color: var(--bg-elevated);
    color: var(--text-secondary);
}

/* Data cell: same narrow width, vertically and horizontally centered. */
.dash-table td.color-dot-cell {
    width: 28px;
    min-width: 28px;
    padding: 10px 6px;
    text-align: center;
    vertical-align: middle;
}