/* ─────────────────────────────────────────────────────────────
   Shared monochrome design system for the public-facing pages
   (homepage, historical, search). Light/dark via [data-theme].
   ───────────────────────────────────────────────────────────── */

:root[data-theme="light"] {
    --bg:            #ffffff;
    --surface:       #fafafa;
    --surface-2:     #f4f4f5;
    --surface-3:     #e4e4e7;
    --text:          #09090b;
    --text-muted:    #52525b;
    --text-subtle:   #a1a1aa;
    --border:        #e4e4e7;
    --border-strong: #d4d4d8;
    --accent:        #18181b;
    --accent-hover:  #000000;
    --accent-fg:     #ffffff;
    --hover:         #f4f4f5;
    --shadow-sm:     0 1px 2px rgba(0,0,0,.04);
    --shadow-md:     0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
    --shadow-lg:     0 10px 25px rgba(0,0,0,.08), 0 4px 10px rgba(0,0,0,.04);
}
:root[data-theme="dark"] {
    --bg:            #09090b;
    --surface:       #18181b;
    --surface-2:     #27272a;
    --surface-3:     #3f3f46;
    --text:          #fafafa;
    --text-muted:    #a1a1aa;
    --text-subtle:   #71717a;
    --border:        #27272a;
    --border-strong: #3f3f46;
    --accent:        #fafafa;
    --accent-hover:  #ffffff;
    --accent-fg:     #09090b;
    --hover:         #27272a;
    --shadow-sm:     0 1px 2px rgba(0,0,0,.4);
    --shadow-md:     0 1px 3px rgba(0,0,0,.5), 0 1px 2px rgba(0,0,0,.3);
    --shadow-lg:     0 10px 25px rgba(0,0,0,.5), 0 4px 10px rgba(0,0,0,.3);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html { color-scheme: light; }
:root[data-theme="dark"] { color-scheme: dark; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.55;
    font-size: .9375rem;
    min-height: 100vh;
    transition: background-color .2s ease, color .2s ease;
}

a { color: inherit; }

/* ─── Top toolbar ─────────────────────────────────────────── */
.topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    backdrop-filter: saturate(180%) blur(8px);
    -webkit-backdrop-filter: saturate(180%) blur(8px);
}
.topbar-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: .85rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}
.topbar-brand {
    display: flex;
    align-items: center;
    gap: .65rem;
    font-weight: 600;
    color: var(--text);
    text-decoration: none;
    font-size: .95rem;
}
.topbar-brand-mark {
    width: 32px; height: 32px;
    display: inline-flex; align-items: center; justify-content: center;
    background: var(--accent);
    color: var(--accent-fg);
    border-radius: 8px;
    font-size: .9rem;
    overflow: hidden;
}
.topbar-brand-mark img { width: 100%; height: 100%; object-fit: cover; }
.topbar-brand-mark.has-logo { background: transparent; }
.topbar-spacer { flex: 1; }
.topbar-actions { display: flex; align-items: center; gap: .5rem; }

.icon-btn, .ghost-btn {
    display: inline-flex; align-items: center; gap: .4rem;
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: .5rem;
    padding: .45rem .7rem;
    font-size: .8125rem; font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    transition: background-color .15s ease, border-color .15s ease, color .15s ease;
}
.icon-btn { width: 36px; height: 36px; padding: 0; justify-content: center; }
.icon-btn:hover, .ghost-btn:hover {
    background: var(--hover);
    border-color: var(--border-strong);
}

.lang-switch {
    display: inline-flex; align-items: center;
    border: 1px solid var(--border);
    border-radius: .5rem;
    overflow: hidden;
    font-size: .75rem; font-weight: 600;
    background: transparent;
}
.lang-switch button {
    background: transparent;
    color: var(--text-muted);
    border: none;
    padding: .4rem .65rem;
    font-family: inherit;
    font-size: inherit;
    font-weight: inherit;
    cursor: pointer;
    transition: background-color .15s, color .15s;
    letter-spacing: .03em;
}
.lang-switch button:hover { color: var(--text); }
.lang-switch button.active {
    background: var(--accent);
    color: var(--accent-fg);
}

.admin-cta {
    display: inline-flex; align-items: center; gap: .45rem;
    background: var(--accent);
    color: var(--accent-fg);
    border: 1px solid var(--accent);
    border-radius: .5rem;
    padding: .55rem 1rem;
    font-size: .8125rem; font-weight: 600;
    text-decoration: none;
    font-family: inherit;
    cursor: pointer;
    transition: background-color .15s, transform .1s, box-shadow .15s;
    box-shadow: var(--shadow-sm);
}
.admin-cta:hover {
    background: var(--accent-hover);
    box-shadow: var(--shadow-md);
}
.admin-cta:active { transform: translateY(1px); }
.admin-cta i { font-size: .85em; }

/* ─── Container & hero ────────────────────────────────────── */
.container { max-width: 1100px; margin: 0 auto; padding: 1.5rem; }

.hero {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: .75rem;
    padding: 2rem 2rem 1.5rem;
    margin-bottom: 1.25rem;
}
.hero h1 {
    margin: 0 0 .35rem;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -.01em;
    display: flex; align-items: center; gap: .65rem;
}
.hero p { margin: 0; color: var(--text-muted); font-size: .875rem; }

.hero-logo {
    display: inline-flex;
    width: 36px; height: 36px;
    border-radius: 8px; overflow: hidden;
    background: var(--surface-2); align-items: center; justify-content: center;
    margin-right: .25rem;
}
.hero-logo img { width: 100%; height: 100%; object-fit: cover; }

.hero-nav { display: flex; gap: .4rem; margin-top: 1.25rem; flex-wrap: wrap; }
.hero-nav a {
    color: var(--text);
    text-decoration: none;
    font-size: .8125rem;
    font-weight: 500;
    border: 1px solid var(--border);
    background: var(--bg);
    padding: .4rem .8rem;
    border-radius: .375rem;
    display: inline-flex; align-items: center; gap: .4rem;
    transition: background-color .15s, border-color .15s;
}
.hero-nav a:hover {
    background: var(--hover);
    border-color: var(--border-strong);
}
.hero-nav a i { color: var(--text-muted); }

/* ─── Cards ───────────────────────────────────────────────── */
.card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: .75rem;
    margin-bottom: 1.25rem;
    overflow: hidden;
}
.card-header {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
    display: flex; justify-content: space-between; align-items: center;
    gap: 1rem; flex-wrap: wrap;
}
.card-header h2 {
    margin: 0;
    font-size: .95rem;
    font-weight: 600;
    color: var(--text);
    display: flex; align-items: center; gap: .5rem;
}
.card-header h2 i { color: var(--text-muted); }
.card-meta { font-size: .8125rem; color: var(--text-muted); }
.card-meta strong { color: var(--text); font-weight: 600; }
.card-body { padding: 1.1rem 1.25rem; }
.card-body.flush { padding: 0; }

/* ─── Mode tabs ───────────────────────────────────────────── */
.mode-tabs {
    display: inline-flex;
    border: 1px solid var(--border);
    border-radius: .5rem;
    margin-bottom: 1rem;
    overflow: hidden;
    background: var(--surface);
}
.mode-tab {
    background: transparent;
    color: var(--text-muted);
    border: none;
    padding: .55rem 1rem;
    font-size: .8125rem; font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    display: inline-flex; align-items: center; gap: .4rem;
    transition: background-color .15s, color .15s;
}
.mode-tab:hover { color: var(--text); }
.mode-tab.active {
    background: var(--accent);
    color: var(--accent-fg);
}
.mode-tab i { font-size: .85em; }

/* ─── Presets ─────────────────────────────────────────────── */
.presets { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1rem; }
.preset {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: .375rem;
    padding: .5rem .9rem;
    font-size: .8125rem; font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    transition: background-color .15s, border-color .15s, color .15s;
    display: inline-flex; align-items: center; gap: .4rem;
}
.preset:hover {
    background: var(--hover);
    border-color: var(--border-strong);
}
.preset.active {
    background: var(--accent);
    color: var(--accent-fg);
    border-color: var(--accent);
}
.preset i { color: var(--text-muted); }
.preset.active i { color: var(--accent-fg); }

/* ─── Filters ─────────────────────────────────────────────── */
.filter-row { display: flex; flex-wrap: wrap; gap: .75rem; align-items: flex-end; }
.filter-row .form-group { flex: 1 1 12rem; display: flex; flex-direction: column; gap: .35rem; }
.filter-row label {
    font-size: .7rem; font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: .05em;
}
.filter-row input, .filter-row select {
    padding: .55rem .7rem;
    border: 1px solid var(--border);
    border-radius: .375rem;
    background: var(--bg);
    color: var(--text);
    font-size: .9rem;
    font-family: inherit;
    transition: border-color .15s, box-shadow .15s;
}
.filter-row input:focus, .filter-row select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--surface-3);
}
:root[data-theme="dark"] input[type="date"]::-webkit-calendar-picker-indicator,
:root[data-theme="dark"] input[type="month"]::-webkit-calendar-picker-indicator {
    filter: invert(1);
}

.btn-go {
    background: var(--accent);
    color: var(--accent-fg);
    border: 1px solid var(--accent);
    border-radius: .375rem;
    padding: .6rem 1.25rem;
    font-size: .875rem; font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    display: inline-flex; align-items: center; gap: .45rem;
    transition: background-color .15s, transform .1s;
}
.btn-go:hover { background: var(--accent-hover); }
.btn-go:active { transform: translateY(1px); }

.btn-outline {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: .375rem;
    padding: .55rem 1rem;
    font-size: .875rem; font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    display: inline-flex; align-items: center; gap: .45rem;
    transition: background-color .15s, border-color .15s;
}
.btn-outline:hover { background: var(--hover); border-color: var(--border-strong); }

/* ─── Result tiles & misc ─────────────────────────────────── */
.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: .75rem;
}
.rate-tile {
    border: 1px solid var(--border);
    border-radius: .5rem;
    padding: 1rem 1.1rem;
    background: var(--surface);
}
.rate-tile .code {
    font-size: .72rem; font-weight: 700;
    color: var(--text-muted);
    letter-spacing: .08em;
    text-transform: uppercase;
    margin-bottom: .25rem;
}
.rate-tile .val {
    font-size: 1.65rem; font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--text);
    letter-spacing: -.02em;
}
.rate-tile .unit { font-size: .72rem; color: var(--text-subtle); margin-top: .2rem; }

/* ─── Banners & states ────────────────────────────────────── */
.banner {
    background: var(--surface-2);
    color: var(--text);
    border-left: 3px solid var(--text-muted);
    padding: .75rem .95rem;
    border-radius: .25rem;
    font-size: .85rem;
    margin-bottom: .85rem;
    display: flex; gap: .55rem; align-items: flex-start;
}
.banner.error { border-left-color: var(--text); }
.banner i { margin-top: 2px; color: var(--text-muted); }
.banner.error i { color: var(--text); }

.loading {
    padding: 1.5rem;
    text-align: center;
    color: var(--text-muted);
    font-size: .9rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .65rem;
}
.spinner {
    width: 28px; height: 28px;
    border: 2px solid var(--border);
    border-top-color: var(--text);
    border-radius: 50%;
    animation: spin .75s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.print-link {
    margin-top: 1rem;
    font-size: .8125rem;
    color: var(--text-muted);
}
.print-link a {
    color: var(--text);
    text-decoration: none;
    border-bottom: 1px dashed var(--text-subtle);
}
.print-link a:hover { border-bottom-style: solid; }

/* ─── Responsive ──────────────────────────────────────────── */
@media (max-width: 640px) {
    .topbar-inner { padding: .75rem 1rem; gap: .5rem; }
    .topbar-brand span { display: none; }
    .admin-cta span { display: none; }
    .admin-cta { padding: .55rem .75rem; }
    .container { padding: 1rem; }
    .hero { padding: 1.5rem 1.25rem 1.25rem; }
    .hero h1 { font-size: 1.25rem; }
}

/* ─── Flatpickr theming (monochrome, dark-aware) ─────────── */
.flatpickr-input.form-control,
input.flatpickr-input,
.flatpickr-input ~ .flatpickr-mobile {
    /* Hidden originals shouldn't grab any space */
}
.filter-row input.flatpickr-input[readonly],
.filter-row input.flatpickr-input.flatpickr-alt-input,
.filter-row input.form-control.flatpickr-input.active,
.filter-row .flatpickr-alt-input {
    /* The visible alt input inherits .filter-row input styles already */
}
.flatpickr-calendar {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    border-radius: .5rem;
}
.flatpickr-calendar.arrowTop:before,
.flatpickr-calendar.arrowBottom:before { border-bottom-color: var(--border); border-top-color: var(--border); }
.flatpickr-calendar.arrowTop:after,
.flatpickr-calendar.arrowBottom:after { border-bottom-color: var(--bg); border-top-color: var(--bg); }
.flatpickr-months .flatpickr-month,
.flatpickr-current-month .flatpickr-monthDropdown-months,
.flatpickr-current-month input.cur-year {
    background: var(--bg);
    color: var(--text);
}
.flatpickr-monthDropdown-months option { background: var(--bg); color: var(--text); }
.flatpickr-weekdays, span.flatpickr-weekday {
    background: var(--surface);
    color: var(--text-muted);
}
.flatpickr-day {
    color: var(--text);
    border-radius: .375rem;
}
.flatpickr-day.today { border-color: var(--text-muted); }
.flatpickr-day.selected,
.flatpickr-day.selected:hover,
.flatpickr-day.startRange,
.flatpickr-day.endRange,
.flatpickr-day.selected.startRange,
.flatpickr-day.selected.endRange {
    background: var(--accent);
    color: var(--accent-fg);
    border-color: var(--accent);
}
.flatpickr-day:hover { background: var(--hover); }
.flatpickr-day.flatpickr-disabled,
.flatpickr-day.prevMonthDay,
.flatpickr-day.nextMonthDay { color: var(--text-subtle); }
.flatpickr-months .flatpickr-prev-month,
.flatpickr-months .flatpickr-next-month { fill: var(--text-muted); color: var(--text-muted); }
.flatpickr-months .flatpickr-prev-month:hover svg,
.flatpickr-months .flatpickr-next-month:hover svg { fill: var(--text); }
.numInputWrapper:hover { background: var(--hover); }
.flatpickr-monthSelect-months .flatpickr-monthSelect-month {
    color: var(--text);
    border-radius: .375rem;
}
.flatpickr-monthSelect-months .flatpickr-monthSelect-month.selected,
.flatpickr-monthSelect-months .flatpickr-monthSelect-month.startRange,
.flatpickr-monthSelect-months .flatpickr-monthSelect-month.endRange {
    background: var(--accent);
    color: var(--accent-fg);
    border-color: var(--accent);
}
.flatpickr-monthSelect-months .flatpickr-monthSelect-month:hover { background: var(--hover); }

/* ─── Print ───────────────────────────────────────────────── */
@media print {
    :root[data-theme="dark"] { color-scheme: light; }
    .topbar, .hero-nav, .presets, .mode-tabs, .filter-row, .print-link, .card-header { display: none !important; }
    body { background: white; color: black; }
    .card { border: 0; }
}