/* ================================================
   File:    style.css
   Subject: Bachelor Thesis — FX Triangular Visualization
   Author:  Felix Vadakumchery
   ================================================ */

/* ------------------------------------------------
   CSS CUSTOM PROPERTIES (VARIABLES)
   Central color and spacing definitions.
   Changing a value here updates it everywhere.
------------------------------------------------ */
:root {
    /* Color palette — UZH brand style */
    --color-bg:           #ffffff;   /* Main background — white */
    --color-surface:      #f4f6fa;   /* Panel background — light blue-grey */
    --color-border:       #dde2ea;   /* Subtle borders */
    --color-accent:       #0028a5;   /* UZH Blue — primary accent */
    --color-accent-hover: #001f8a;   /* Darker UZH Blue on hover */
    --color-text:         #1c1c1c;   /* Primary text — near black */
    --color-text-muted:   #5f6b7a;   /* Secondary text — medium grey */
    --color-success:      #057a55;   /* Green for sanity check */
    --color-error:        #c81e1e;   /* Red for error messages */

    /* Currency axis colors — kept in sync with getChartColors() in main.js */
    --color-currency-a:   #0028a5;
    --color-currency-b:   #057a55;
    --color-currency-c:   #be185d;

    /* Spacing */
    --spacing-xs:  4px;
    --spacing-sm:  8px;
    --spacing-md:  16px;
    --spacing-lg:  24px;
    --spacing-xl:  32px;

    /* Border radius */
    --radius-sm:  6px;
    --radius-md:  10px;
    --radius-lg:  16px;

    /* Typography */
    --font-main:  'Inter', 'Segoe UI', system-ui, sans-serif;
    --font-mono:  'JetBrains Mono', 'Fira Code', monospace;
}

/* ------------------------------------------------
   RESET AND BASE STYLES
   Removes browser default margins and sets
   a consistent box model across all elements.
------------------------------------------------ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    font-family: var(--font-main);
    background-color: var(--color-bg);
    color: var(--color-text);
    font-size: 14px;
    line-height: 1.6;
    /* Smooth font rendering on macOS */
    -webkit-font-smoothing: antialiased;
}

/* ------------------------------------------------
   HEADER
   Top bar with application title and subtitle.
------------------------------------------------ */
.app-header {
    background-color: var(--color-surface);
    border-bottom: 3px solid var(--color-accent);
    padding: var(--spacing-lg) var(--spacing-xl);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.uzh-logo-link {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.uzh-logo {
    height: 52px;
    width: auto;
}

.app-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.3px;
}

.app-subtitle {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
}

/* ------------------------------------------------
   MAIN LAYOUT
   Two-column layout: control panel on the left,
   chart area filling the remaining space on the right.
------------------------------------------------ */
.app-main {
    display: flex;
    height: calc(100vh - 73px); /* Full height minus header */
    max-width: 1400px;
    margin: 0 auto;
    gap: 0;
}

/* ------------------------------------------------
   CONTROL PANEL
   Left sidebar containing all user inputs.
------------------------------------------------ */
.control-panel {
    width: 240px;
    min-width: 240px;
    background-color: var(--color-surface);
    border-right: 1px solid var(--color-border);
    padding: var(--spacing-md);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    transition: width 0.25s ease, min-width 0.25s ease, padding 0.25s ease;
}

.control-panel.collapsed {
    width: 0;
    min-width: 0;
    padding: 0;
    overflow: hidden;
    border-right: none;
}

/* ------------------------------------------------
   SIDEBAR TOGGLE STRIP
   Thin vertical bar between panel and chart.
   Shows ‹ / › to collapse or expand the sidebar.
------------------------------------------------ */
.sidebar-toggle {
    width: 16px;
    min-width: 16px;
    background-color: var(--color-surface);
    border: none;
    border-left: 1px solid var(--color-border);
    border-right: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 13px;
    font-family: var(--font-main);
    cursor: pointer;
    padding: 0;
    flex-shrink: 0;
    transition: background-color 0.2s, color 0.2s;
}

.sidebar-toggle:hover {
    background-color: var(--color-border);
    color: var(--color-text);
}

.panel-title {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--color-text-muted);
}

/* ------------------------------------------------
   FORM ELEMENTS
   Shared styles for all input groups.
------------------------------------------------ */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-label {
    font-size: 12px;
    font-weight: 500;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Row wrapper used by Granularity and Normalization labels —
   mirrors .sanity-header so the ? tooltip aligns consistently */
.form-label-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Shared styles for all select dropdowns and date inputs */
.form-select,
.currency-select,
.date-input {
    background-color: var(--color-bg);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 13px;
    font-family: var(--font-main);
    width: 100%;
    cursor: pointer;
    transition: border-color 0.2s ease;
    appearance: none;       /* Remove default browser arrow */
    /* Custom dropdown arrow using SVG */
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238b8fa8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 28px;
}

.form-select:focus,
.currency-select:focus,
.date-input:focus {
    outline: none;
    border-color: var(--color-accent);
}

/* ------------------------------------------------
   DATE RANGE PRESETS
   Quick-select pill buttons that populate the date
   inputs. Active state matches the accent color.
------------------------------------------------ */
.preset-btns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xs);
}

.preset-btn {
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-size: 12px;
    font-family: var(--font-main);
    padding: var(--spacing-xs) 0;
    cursor: pointer;
    transition: border-color 0.2s, color 0.2s, background-color 0.2s;
    text-align: center;
}

.preset-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-text);
}

.preset-btn--active {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background-color: rgba(0, 40, 165, 0.07);
}

.preset-btn--wide {
    grid-column: span 2;
}

/* ------------------------------------------------
   CURRENCY SELECTORS
   Three dropdowns displayed in a row with labels.
------------------------------------------------ */
.currency-selectors {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.selector-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.selector-label {
    /* Circle badge showing A, B or C */
    width: 24px;
    height: 24px;
    min-width: 24px;
    background-color: var(--color-accent);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 700;
}

/* Badge colors match the chart axis colors for A, B, C */
.currency-selectors .selector-wrapper:nth-child(1) .selector-label {
    background-color: var(--color-currency-a);
}
.currency-selectors .selector-wrapper:nth-child(2) .selector-label {
    background-color: var(--color-currency-b);
}
.currency-selectors .selector-wrapper:nth-child(3) .selector-label {
    background-color: var(--color-currency-c);
}

/* ------------------------------------------------
   DATE INPUTS
------------------------------------------------ */
.date-inputs {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.date-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.date-label {
    font-size: 12px;
    color: var(--color-text-muted);
    min-width: 28px;
}

/* Override the default calendar icon color on webkit browsers */
.date-input::-webkit-calendar-picker-indicator {
    filter: invert(0.6);
    cursor: pointer;
}

/* ------------------------------------------------
   GENERATE BUTTON
------------------------------------------------ */
.generate-btn {
    background-color: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    font-size: 14px;
    font-weight: 600;
    font-family: var(--font-main);
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
    width: 100%;
    margin-top: var(--spacing-sm);
}

.generate-btn:hover {
    background-color: var(--color-accent-hover);
}

.generate-btn:active {
    /* Slight press-down effect on click */
    transform: scale(0.98);
}

.generate-btn:disabled {
    /* Greyed out while request is in progress */
    background-color: var(--color-border);
    cursor: not-allowed;
    transform: none;
}

/* ------------------------------------------------
   RESET BUTTON
   Secondary action below the generate button.
------------------------------------------------ */
.reset-btn {
    background-color: transparent;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 13px;
    font-weight: 500;
    font-family: var(--font-main);
    cursor: pointer;
    transition: border-color 0.2s ease, color 0.2s ease;
    width: 100%;
}

.reset-btn:hover {
    border-color: var(--color-error);
    color: var(--color-error);
}

/* ------------------------------------------------
   ERROR MESSAGE
------------------------------------------------ */
.error-msg {
    background-color: rgba(200, 30, 30, 0.08);
    border: 1px solid var(--color-error);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-error);
    font-size: 12px;
    line-height: 1.5;
}

/* ------------------------------------------------
   SANITY CHECK DISPLAY
------------------------------------------------ */
.sanity-check {
    background-color: rgba(5, 122, 85, 0.07);
    border: 1px solid rgba(5, 122, 85, 0.28);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.sanity-label {
    font-size: 11px;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sanity-value {
    font-size: 16px;
    font-weight: 600;
    font-family: var(--font-mono);
    color: var(--color-success);
}

.sanity-note {
    font-size: 11px;
    color: var(--color-text-muted);
}

/* ------------------------------------------------
   CHART SECTION
   Right side — fills all remaining space.
------------------------------------------------ */
.chart-section {
    flex: 1;                /* Takes all remaining horizontal space */
    display: flex;
    flex-direction: column;
    padding: 4px var(--spacing-sm);
    gap: 4px;
    overflow: hidden;
}

/* The div that Plotly renders the chart into */
.chart-container {
    flex: 1;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    overflow: hidden;
    background-color: var(--color-surface);
    min-height: 400px;
}

/* ------------------------------------------------
   LOADING INDICATOR
------------------------------------------------ */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    color: var(--color-text-muted);
}

/* Animated spinning circle */
.loading-spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    font-size: 13px;
    color: var(--color-text-muted);
}

/* ------------------------------------------------
   DOWNLOAD BAR
   Shown below the chart after successful generation.
------------------------------------------------ */
.download-bar {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

/* Direction key — small labeled row showing which chart direction = which currency */
.direction-key {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    padding: 4px 0;
    font-size: 12px;
    font-family: var(--font-main);
    color: var(--color-text-muted);
}

.dir-item {
    font-weight: 600;
    letter-spacing: 0.01em;
}

.download-btn {
    background-color: transparent;
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 13px;
    font-family: var(--font-main);
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.download-btn:hover {
    background-color: var(--color-accent);
    color: white;
}

/* ------------------------------------------------
   ANIMATION BAR + TOGGLE BUTTON
   Shown below the chart after rendering.
------------------------------------------------ */
.anim-bar {
    display: flex;
    align-items: center;
    padding: 3px 8px;
    border-top: 1px solid var(--color-border);
}

.anim-toggle-btn {
    padding: 3px 14px;
    font-size: 13px;
    font-family: var(--font-main);
    background-color: transparent;
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.anim-toggle-btn:hover {
    background-color: var(--color-accent);
    color: white;
}

.anim-toggle-btn:disabled {
    opacity: 0.55;
    cursor: wait;
}

/* Tooltip on the arrow toggle button — only present when data-tooltip is set (arrows hidden, large dataset) */
#arrow-toggle-btn {
    position: relative;
}

#arrow-toggle-btn[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 6px);
    left: 0;
    background: var(--color-surface-2);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 4px 10px;
    font-size: 11px;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s ease;
    z-index: 100;
}

#arrow-toggle-btn[data-tooltip]:hover::after {
    opacity: 1;
}

/* ------------------------------------------------
   DATA NOTES TOGGLE
   Small pill that reveals/hides the notes section.
   Collapsed by default to maximise chart height.
------------------------------------------------ */
.notes-toggle {
    align-self: flex-start;
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    font-size: 11px;
    font-family: var(--font-main);
    padding: 2px 0 2px 14px;
    cursor: pointer;
    transition: color 0.15s ease;
}

.notes-toggle:hover {
    color: var(--color-text);
}

/* ------------------------------------------------
   DATA AVAILABILITY NOTES
   Shown below the chart when ECB data coverage is
   limited for the selected currencies or date range,
   and when aggregated granularities are in use.
------------------------------------------------ */
.data-notes {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 8px 14px;
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
}

.data-note {
    font-size: 12px;
    font-family: var(--font-main);
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ------------------------------------------------
   UTILITY CLASS
   Elements with this class are not visible.
   JavaScript adds and removes this class dynamically.
------------------------------------------------ */
.hidden {
    display: none !important;
}

/* ------------------------------------------------
   DARK MODE OVERRIDES
   Applied via [data-theme="dark"] on <html>.
   Restores the original dark palette and fixes
   any hardcoded light-only rgba values.
------------------------------------------------ */
[data-theme="dark"] {
    --color-bg:           #0f1117;
    --color-surface:      #1a1d27;
    --color-border:       #2a2d3e;
    --color-accent:       #4f8ef7;
    --color-accent-hover: #3a7ae0;
    --color-text:         #e8eaf0;
    --color-text-muted:   #8b8fa8;
    --color-success:      #43c59e;
    --color-error:        #e05c5c;

    /* Currency axis colors — dark mode equivalents */
    --color-currency-a:   #4f8ef7;
    --color-currency-b:   #43c59e;
    --color-currency-c:   #f472b6;
}

[data-theme="dark"] .error-msg {
    background-color: rgba(224, 92, 92, 0.12);
}

[data-theme="dark"] .sanity-check {
    background-color: rgba(67, 197, 158, 0.08);
    border-color:     rgba(67, 197, 158, 0.3);
}

[data-theme="dark"] .preset-btn--active {
    background-color: rgba(79, 142, 247, 0.08);
}

[data-theme="dark"] .eur-note {
    background-color: rgba(79, 142, 247, 0.08);
    border-color:     rgba(79, 142, 247, 0.25);
}

[data-theme="dark"] .info-tooltip {
    background-color: #252836;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .uzh-logo {
    filter: brightness(0) invert(1);
}

/* ------------------------------------------------
   THEME TOGGLE BUTTON
------------------------------------------------ */
.theme-toggle {
    background: none;
    color: var(--color-text-muted);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 15px;
    line-height: 1;
    cursor: pointer;
    font-family: var(--font-main);
    transition: border-color 0.2s, color 0.2s;
    position: relative;
}

.theme-toggle:hover {
    color: var(--color-text);
    border-color: var(--color-accent);
}

/* Custom CSS tooltip using data-tooltip to avoid the duplicate native title bubble */
.theme-toggle::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 6px);
    right: 0;
    background-color: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 4px 8px;
    font-size: 11px;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s ease;
    z-index: 200;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.10);
}

.theme-toggle:hover::after {
    opacity: 1;
}

/* ------------------------------------------------
   HEADER NAVIGATION
   Links displayed on the right side of the header.
------------------------------------------------ */
.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-left {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    border-left: 2px solid var(--color-border);
    padding-left: var(--spacing-lg);
}

.header-nav {
    display: flex;
    gap: var(--spacing-sm);
}

.nav-link {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease;
}

.nav-link:hover {
    color: var(--color-text);
}

.nav-link--active {
    color: var(--color-accent);
    border-color: var(--color-accent);
}

/* ------------------------------------------------
   ABOUT PAGE LAYOUT
------------------------------------------------ */
.about-main {
    max-width: 820px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

.about-article {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.about-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.4px;
}

.about-lead {
    font-size: 15px;
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-top: calc(-1 * var(--spacing-md));
}

/* ------------------------------------------------
   ABOUT PAGE SECTIONS
------------------------------------------------ */
.about-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.about-h2 {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
}

.about-h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    margin-top: 16px;
    margin-bottom: 4px;
}

.about-section p {
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.85;
}

.about-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding-left: var(--spacing-md);
}

.about-list li {
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.7;
    position: relative;
}

.about-list li::before {
    content: "—";
    position: absolute;
    left: calc(-1 * var(--spacing-md));
    color: var(--color-border);
}

/* ------------------------------------------------
   ABOUT PAGE TABLE
------------------------------------------------ */
.about-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    margin: var(--spacing-md) 0;
}
.about-table th,
.about-table td {
    padding: 7px 12px;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}
.about-table thead th {
    color: var(--color-text-muted);
    font-weight: 600;
    border-bottom: 2px solid var(--color-border);
}
.about-table tbody tr:last-child td { border-bottom: none; }
.about-table tbody tr:hover { background: var(--color-surface); }

/* ------------------------------------------------
   MATH FORMULA BLOCKS
   MathJax renders LaTeX formulas inside these divs.
------------------------------------------------ */
.math-block {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: center;
    font-size: 15px;
    overflow-x: auto;     /* Allows horizontal scrolling on narrow screens */
}

/* ------------------------------------------------
   ABOUT PAGE LINK
------------------------------------------------ */
.about-link {
    color: var(--color-accent);
    text-decoration: none;
}

.about-link:hover {
    text-decoration: underline;
}

/* ------------------------------------------------
   INFO BUTTON AND TOOLTIP
   The ? button next to the sanity check indicator.
   The tooltip is shown on hover using CSS positioning.
------------------------------------------------ */
.sanity-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
}

.info-btn-wrapper {
    position: relative;
    display: inline-flex;
}

/* Invisible bridge that fills the gap between the ? button and the tooltip.
   Without this the mouse exits the wrapper while crossing the 8px gap and the
   tooltip disappears before the user can read it. */
.info-btn-wrapper::after {
    content: '';
    position: absolute;
    left: -4px;
    right: -4px;
    bottom: 100%;   /* bridge sits above the button */
    height: 8px;
}

/* Downward variant — used when the button is high enough that opening upward
   would clip against the panel top (e.g. Granularity, Normalization labels). */
.info-btn-wrapper--down::after {
    bottom: auto;
    top: 100%;      /* bridge sits below the button */
}

.info-btn-wrapper--down .info-tooltip {
    bottom: auto;
    top: calc(100% + 8px);  /* tooltip opens below the button */
}

.info-btn {
    /* Small circular button displaying a question mark */
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 1px solid var(--color-text-muted);
    background: transparent;
    color: var(--color-text-muted);
    font-size: 11px;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    transition: border-color 0.2s, color 0.2s;
    padding: 0;
}

.info-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.info-tooltip {
    /* Opens upward, right-aligned to the ? button.
       Width is capped at 200 px so it stays within the 208 px panel inner width
       (240 px panel − 16 px padding × 2) and is never clipped by the panel's
       overflow-x (which is forced to auto by overflow-y: auto). */
    display: none;
    position: absolute;
    bottom: calc(100% + 8px);
    right: 0;
    width: 200px;
    background-color: #ffffff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
    z-index: 100;
}

.info-btn-wrapper:hover .info-tooltip {
    /* The tooltip appears when the wrapper (button + tooltip) is hovered */
    display: block;
}

.info-tooltip strong {
    display: block;
    font-size: 12px;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.info-tooltip p {
    font-size: 11px;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.info-tooltip p:last-child {
    margin-bottom: 0;
}

/* ------------------------------------------------
   VIEW TABS
   Tab buttons for switching between Triangular Chart
   and Time Series views.
------------------------------------------------ */
.view-tabs {
    display: flex;
    gap: var(--spacing-xs);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 3px;
    margin-bottom: 3px;
}

.view-tab {
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-size: 13px;
    font-weight: 500;
    font-family: var(--font-main);
    padding: var(--spacing-xs) var(--spacing-md);
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s;
}

.view-tab:hover {
    color: var(--color-text);
}

.view-tab--active {
    color: var(--color-accent);
    border-color: var(--color-accent);
}

/* ------------------------------------------------
   VIEW PANELS
   Each panel corresponds to one tab.
   Only the active panel is visible.
------------------------------------------------ */
.view-panel {
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 4px;
    min-height: 0;
}

/* ------------------------------------------------
   DOWNLOAD GROUP
   Wraps the download label and format buttons side by side.
------------------------------------------------ */
.download-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.download-label {
    font-size: 12px;
    color: var(--color-text-muted);
}

.download-btn {
    background-color: transparent;
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 13px;
    font-family: var(--font-main);
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
}

.download-btn:hover {
    background-color: var(--color-accent);
    color: white;
}

/* ------------------------------------------------
   EUR INFO NOTE
   Shown in the time series view when EUR is selected,
   explaining why it has no data line.
------------------------------------------------ */
.eur-note {
    background-color: rgba(0, 40, 165, 0.07);
    border: 1px solid rgba(0, 40, 165, 0.22);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-muted);
    font-size: 12px;
    line-height: 1.6;
}

/* ------------------------------------------------
   EVENTS PANEL
   Right sidebar mirroring the left control panel.
------------------------------------------------ */


.events-panel {
    width: 260px;
    min-width: 260px;
    background-color: var(--color-surface);
    border-left: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: width 0.25s ease, min-width 0.25s ease;
}
.events-panel.collapsed {
    width: 0;
    min-width: 0;
    border-left: none;
}

.events-panel-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 12px 8px;
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}
.events-panel-title {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--color-text-muted);
}
.events-count {
    font-size: 11px;
    color: var(--color-text-muted);
    background: var(--color-border);
    border-radius: 10px;
    padding: 1px 7px;
    flex-shrink: 0;
}
.events-chart-btn {
    margin-left: auto;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-size: 11px;
    font-family: var(--font-main);
    padding: 3px 8px;
    cursor: pointer;
    transition: border-color 0.2s, color 0.2s;
    flex-shrink: 0;
}
.events-chart-btn:hover { border-color: var(--color-accent); color: var(--color-text); }
.events-chart-btn.active {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

/* Tier filter bar */
.events-tier-bar {
    display: flex;
    gap: 4px;
    padding: 6px 10px;
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
    flex-wrap: wrap;
}
.tier-btn {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-size: 11px;
    font-family: var(--font-main);
    padding: 2px 8px;
    cursor: pointer;
    transition: all 0.15s;
}
.tier-btn:hover { border-color: var(--color-accent); color: var(--color-text); }
.tier-btn--active {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

/* Pin all / unpin all bar */
.events-pin-bar {
    display: flex;
    gap: 4px;
    padding: 6px 10px;
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

/* Events list */
.events-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px 0;
}
.events-placeholder {
    color: var(--color-text-muted);
    font-size: 12px;
    text-align: center;
    padding: 20px 12px;
}

/* Year group */
.event-year-group { margin-bottom: 4px; }
.event-year-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--color-text-muted);
    padding: 4px 12px 2px;
    letter-spacing: 0.5px;
    position: sticky;
    top: 0;
    background: var(--color-surface);
    z-index: 1;
}

/* Individual event item */
.event-item {
    display: flex;
    align-items: flex-start;
    gap: 6px;
    padding: 5px 12px;
    cursor: pointer;
    transition: background 0.15s;
    border-left: 2px solid transparent;
    user-select: none;
}
.event-item:hover { background: var(--color-bg); }
.event-item.pinned {
    background: var(--color-bg);
    border-left-color: #f59e0b;
}

/* Importance dot */
.event-imp {
    font-size: 9px;
    margin-top: 3px;
    flex-shrink: 0;
    width: 16px;
    text-align: center;
}
.event-imp--3 { color: #dc2626; }
.event-imp--2 { color: #d97706; }
.event-imp--1 { color: var(--color-text-muted); }

/* Event text */
.event-content { flex: 1; min-width: 0; }
.event-date {
    font-size: 10px;
    color: var(--color-text-muted);
    margin-bottom: 1px;
    font-variant-numeric: tabular-nums;
}
.event-label {
    font-size: 11px;
    line-height: 1.35;
    color: var(--color-text);
    word-break: break-word;
}


/* Events anim-bar button — shown when panel is collapsed and chart is rendered */
#events-anim-btn { margin-left: auto; }

/* Dark mode overrides for events panel */
[data-theme="dark"] .event-year-label { background: var(--color-surface); }