:root {
    color-scheme: dark;
    --bg: #09111f;
    --bg-soft: #101b2e;
    --panel: rgba(12, 22, 41, 0.88);
    --panel-border: rgba(148, 163, 184, 0.18);
    --panel-border-strong: rgba(148, 163, 184, 0.28);
    --text: #e5eefc;
    --muted: #99a7c2;
    --accent: #6ea8fe;
    --accent-strong: #8b5cf6;
    --accent-soft: rgba(110, 168, 254, 0.14);
    --success: #4ade80;
    --warning: #fbbf24;
    --danger: #fca5a5;
    --input-bg: rgba(9, 17, 31, 0.22);
    --tip-bg: #0f172a;
    --tip-text: #e2e8f0;
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.32);
    --shadow-soft: 0 10px 24px rgba(0, 0, 0, 0.25);
    --radius: 20px;
}

:root[data-theme="light"] {
    color-scheme: light;
    --bg: #f4f8ff;
    --bg-soft: #ffffff;
    --panel: rgba(255, 255, 255, 0.95);
    --panel-border: rgba(15, 23, 42, 0.08);
    --panel-border-strong: rgba(15, 23, 42, 0.14);
    --text: #162033;
    --muted: #5c6c87;
    --accent: #235bff;
    --accent-strong: #7c3aed;
    --accent-soft: rgba(35, 91, 255, 0.1);
    --success: #15803d;
    --warning: #b45309;
    --danger: #b91c1c;
    --input-bg: rgba(244, 248, 255, 0.92);
    --tip-bg: #1e293b;
    --tip-text: #f8fafc;
    --shadow: 0 18px 48px rgba(15, 23, 42, 0.12);
    --shadow-soft: 0 8px 20px rgba(15, 23, 42, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(circle at top left, rgba(110, 168, 254, 0.18), transparent 30%),
        radial-gradient(circle at top right, rgba(139, 92, 246, 0.16), transparent 22%),
        var(--bg);
    color: var(--text);
    font: 16px/1.5 Inter, "Segoe UI", Roboto, Arial, sans-serif;
}

a { color: var(--accent); }
button, input, select { font: inherit; }

code {
    padding: 0.08rem 0.38rem;
    border-radius: 8px;
    background: rgba(148, 163, 184, 0.14);
    font-size: 0.92em;
}

.page-shell {
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px;
}

/* ============================
   Shared icon styling
   ============================ */
.wu-ico {
    width: 18px;
    height: 18px;
    flex: 0 0 auto;
    color: currentColor;
    vertical-align: middle;
}
.wu-ico-sm { width: 14px; height: 14px; }

/* ============================
   Panel / card surfaces
   ============================ */
.app-ad,
.hero,
.search-panel,
.summary-card,
.results-panel,
.side-card,
.info-card,
.result-card,
.quick-start-card {
    backdrop-filter: blur(18px);
    background: var(--panel);
    border: 1px solid var(--panel-border);
    box-shadow: var(--shadow);
}

.app-ad,
.ft-ads-wrap {
    margin-top: 20px;
    padding: 18px 22px;
    border-radius: 22px;
    background: var(--panel);
    border: 1px solid var(--panel-border);
    box-shadow: var(--shadow-soft);
}
.app-ad-top { margin-top: 16px; }
.app-ad-footer { margin-top: 24px; }
.promo-copy, .app-ad-label, .ft-ads-label, .ft-ads-note {
    margin: 6px 0 0; color: var(--muted);
}
.app-ad-label, .ft-ads-label {
    font-size: 0.84rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.05em;
}

/* ============================
   Breadcrumbs + tool footer
   ============================ */
.tool-breadcrumbs {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    font-size: 0.9rem;
    color: var(--muted);
}
.breadcrumb-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0.4rem 0.7rem;
    border-radius: 999px;
    color: var(--text);
    background: rgba(148, 163, 184, 0.1);
    border: 1px solid var(--panel-border);
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.breadcrumb-back:hover,
.breadcrumb-back:focus-visible {
    outline: none;
    transform: translateY(-1px);
    border-color: rgba(110, 168, 254, 0.45);
    background: var(--accent-soft);
    color: var(--text);
}
.breadcrumb-back .wu-ico { transform: rotate(90deg); color: var(--accent); }
.breadcrumb-sep { color: var(--muted); }
.breadcrumb-current { color: var(--text); font-weight: 600; }

.tool-footer {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 24px;
    padding: 20px 22px;
    border-radius: 20px;
    background: var(--panel);
    border: 1px solid var(--panel-border);
    box-shadow: var(--shadow-soft);
}
.tool-footer-note { margin: 0; color: var(--muted); font-size: 0.9rem; }
.tool-footer .ghost-button { flex: 0 0 auto; }

/* ============================
   Hero
   ============================ */
.hero {
    display: grid;
    gap: 20px;
    padding: 32px;
    border-radius: 28px;
}
.hero-compact { grid-template-columns: 1fr; }
.hero-copy { max-width: 70ch; }

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 12px;
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    color: var(--accent);
    background: var(--accent-soft);
    font-size: 0.88rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.hero h1 {
    margin: 0 0 12px;
    line-height: 1.05;
    font-size: clamp(2rem, 5vw, 3.4rem);
    letter-spacing: -0.01em;
}

.hero-text {
    margin: 0 0 18px;
    color: var(--muted);
    font-size: 1.05rem;
}
.hero-text strong { color: var(--text); }

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.hero-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0.7rem 1rem;
    border-radius: 999px;
    color: var(--text);
    background: rgba(148, 163, 184, 0.1);
    border: 1px solid var(--panel-border);
    cursor: pointer;
    text-decoration: none;
    font-size: 0.92rem;
    font-weight: 600;
    transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.hero-chip:hover,
.hero-chip:focus-visible {
    transform: translateY(-1px);
    border-color: rgba(110, 168, 254, 0.45);
    background: var(--accent-soft);
    outline: none;
}

/* ============================
   Layout
   ============================ */
.layout {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(280px, 1fr);
    gap: 24px;
    margin-top: 24px;
}

.main-column,
.side-column,
.summary-grid,
.info-section,
.results-grid {
    display: grid;
    gap: 18px;
}

.search-panel,
.results-panel,
.side-card,
.info-card {
    padding: 24px;
    border-radius: 24px;
}

/* ============================
   Primary search
   ============================ */
.primary-search {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 18px;
    align-items: end;
}

.field {
    display: grid;
    gap: 8px;
    min-width: 0;
}
.field label {
    font-weight: 700;
    font-size: 0.95rem;
}

.field-label-row {
    display: flex;
    align-items: center;
    gap: 6px;
    min-height: 22px;
}

.input-with-icon {
    position: relative;
    display: flex;
    align-items: center;
}
.input-with-icon .input-icon {
    position: absolute;
    left: 14px;
    width: 20px;
    height: 20px;
    color: var(--muted);
    pointer-events: none;
}
.input-with-icon input {
    padding-left: 44px !important;
}

.field input,
.field select {
    width: 100%;
    padding: 0.95rem 1rem;
    border: 1px solid var(--panel-border);
    border-radius: 14px;
    color: var(--text);
    background: var(--input-bg);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.field input:focus,
.field select:focus {
    outline: none;
    border-color: rgba(110, 168, 254, 0.55);
    box-shadow: 0 0 0 4px rgba(110, 168, 254, 0.15);
}

.field-main input {
    font-size: 1.15rem;
    letter-spacing: 0.02em;
    font-weight: 600;
}

.field-hint {
    margin: 0;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--muted);
    font-size: 0.85rem;
}
.field-hint .wu-ico { color: var(--accent); }

.primary-actions {
    display: flex;
    gap: 10px;
    align-items: center;
}

.primary-button,
.ghost-button,
.icon-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 0;
    border-radius: 14px;
    cursor: pointer;
    font-weight: 600;
    transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
    white-space: nowrap;
}

.primary-button {
    padding: 1rem 1.4rem;
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
    box-shadow: var(--shadow-soft);
}
.primary-button:hover,
.primary-button:focus-visible {
    transform: translateY(-1px);
    outline: none;
    box-shadow: 0 12px 28px rgba(110, 168, 254, 0.35);
}

.ghost-button {
    padding: 0.85rem 1.05rem;
    color: var(--text);
    background: rgba(148, 163, 184, 0.1);
    border: 1px solid var(--panel-border);
}
.ghost-button:hover,
.ghost-button:focus-visible {
    transform: translateY(-1px);
    outline: none;
    border-color: rgba(110, 168, 254, 0.45);
    background: var(--accent-soft);
}

.icon-button {
    padding: 0.55rem 0.8rem;
    font-size: 0.88rem;
    color: var(--text);
    background: rgba(148, 163, 184, 0.08);
    border: 1px solid var(--panel-border);
}
.icon-button:hover,
.icon-button:focus-visible {
    outline: none;
    border-color: rgba(110, 168, 254, 0.45);
    background: var(--accent-soft);
}
.icon-button.is-favourite {
    border-color: rgba(251, 191, 36, 0.45);
    color: var(--warning);
    background: rgba(251, 191, 36, 0.08);
}

/* ============================
   Example chips row
   ============================ */
.example-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    margin-top: 14px;
}
.example-row-label {
    color: var(--muted);
    font-size: 0.85rem;
    font-weight: 600;
    margin-right: 2px;
}
.example-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0.5rem 0.85rem;
    border-radius: 999px;
    font-size: 0.9rem;
    color: var(--text);
    background: rgba(148, 163, 184, 0.1);
    border: 1px solid var(--panel-border);
    cursor: pointer;
    transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.example-chip:hover,
.example-chip:focus-visible {
    outline: none;
    transform: translateY(-1px);
    border-color: rgba(110, 168, 254, 0.45);
    background: var(--accent-soft);
}
.example-chip .wu-ico { color: var(--accent); }

/* ============================
   Info tooltip button
   ============================ */
.wu-info {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    transition: color 0.15s ease, background 0.15s ease;
}
.wu-info:hover,
.wu-info:focus-visible,
.wu-info.is-open {
    color: var(--accent);
    background: var(--accent-soft);
    outline: none;
}
.wu-info .wu-ico { width: 16px; height: 16px; }

.wu-tip-bubble {
    position: absolute;
    top: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%) translateY(-4px);
    min-width: 180px;
    max-width: min(260px, calc(100vw - 32px));
    padding: 10px 12px;
    background: var(--tip-bg);
    color: var(--tip-text);
    border-radius: 10px;
    font-size: 0.82rem;
    line-height: 1.45;
    font-weight: 500;
    text-align: left;
    white-space: normal;
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease, transform 0.15s ease;
    z-index: 60;
}
.wu-tip-bubble::before {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-bottom-color: var(--tip-bg);
}

.wu-info:hover .wu-tip-bubble,
.wu-info:focus-visible .wu-tip-bubble,
.wu-info.is-open .wu-tip-bubble {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

/* On very small screens let the tooltip anchor to the left edge of its button */
@media (max-width: 480px) {
    .wu-tip-bubble {
        left: 0;
        transform: translateX(0) translateY(-4px);
    }
    .wu-tip-bubble::before { left: 11px; transform: translateX(0); }
    .wu-info:hover .wu-tip-bubble,
    .wu-info:focus-visible .wu-tip-bubble,
    .wu-info.is-open .wu-tip-bubble {
        transform: translateX(0) translateY(0);
    }
}

/* ============================
   Advanced filters accordion
   ============================ */
.filters-panel {
    margin-top: 20px;
    border: 1px solid var(--panel-border);
    border-radius: 18px;
    background: rgba(148, 163, 184, 0.05);
    overflow: hidden;
}
.filters-panel > summary {
    list-style: none;
    cursor: pointer;
    padding: 14px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    font-weight: 700;
    user-select: none;
}
.filters-panel > summary::-webkit-details-marker { display: none; }
.summary-head {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    flex: 1 1 auto;
    min-width: 0;
}
.summary-icon { color: var(--accent); }
.summary-title { font-size: 1rem; }
.summary-hint {
    color: var(--muted);
    font-weight: 500;
    font-size: 0.85rem;
}
.summary-chevron {
    transition: transform 0.25s ease;
    color: var(--muted);
}
.filters-panel[open] > summary .summary-chevron {
    transform: rotate(180deg);
    color: var(--accent);
}
.filters-panel[open] > summary {
    border-bottom: 1px solid var(--panel-border);
}
.filters-body {
    padding: 18px;
    display: grid;
    gap: 16px;
}

.filters-subhead {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 6px 0 -4px;
    font-weight: 700;
    font-size: 0.88rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--muted);
}
.filters-subhead .wu-ico { color: var(--accent); }

.filters-row {
    display: grid;
    gap: 14px;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}
.filters-row-primary {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.toggle-row {
    display: flex;
    flex-wrap: wrap;
    gap: 14px 22px;
    padding-top: 4px;
    border-top: 1px dashed var(--panel-border);
    margin-top: 4px;
    padding-top: 14px;
}
.toggle-row label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.93rem;
    cursor: pointer;
}
.toggle-row input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--accent); }

.field-pattern { display: none; }
.filters-row-primary.has-pattern .field-pattern { display: grid; }
.filters-row-primary.has-pattern {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.live-note {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin: 14px 0 0;
    color: var(--muted);
    font-size: 0.85rem;
}
.live-note .wu-ico { color: var(--warning); }

/* ============================
   Feedback + summary + quick-start
   ============================ */
.feedback { margin-top: 16px; }
.feedback-error,
.feedback-neutral {
    margin: 0;
    padding: 0.8rem 1rem;
    border-radius: 12px;
    font-size: 0.92rem;
}
.feedback-error {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.16);
}
.feedback-neutral {
    background: var(--accent-soft);
    border: 1px solid rgba(110, 168, 254, 0.16);
}

.summary-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin: 6px 0;
}
.summary-card { padding: 18px; border-radius: 18px; }
.summary-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--muted);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.summary-card strong {
    display: block;
    margin-top: 10px;
    font-size: 1.15rem;
}
.summary-label .wu-ico { color: var(--accent); }

.quick-start-grid {
    display: grid;
    gap: 14px;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}
.quick-start-card {
    padding: 18px;
    border-radius: 18px;
    position: relative;
}
.quick-start-card .quick-ico {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    margin-bottom: 10px;
    border-radius: 12px;
    color: var(--accent);
    background: var(--accent-soft);
}
.quick-start-card .quick-ico svg { width: 20px; height: 20px; }
.quick-start-card h3 { margin: 0 0 6px; font-size: 1.05rem; }
.quick-start-card p { margin: 0; color: var(--muted); font-size: 0.92rem; }

/* ============================
   Results
   ============================ */
.results-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 18px;
}
.results-toolbar h2 {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 4px;
}
.results-toolbar h2 .wu-ico { color: var(--accent); }
.results-subtitle { margin: 0; color: var(--muted); font-size: 0.9rem; }
.results-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.results-grid { min-height: 220px; }

.result-card {
    padding: 18px;
    border-radius: 20px;
}
.result-main {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: flex-start;
}
.result-card h3 { margin: 0 0 4px; font-size: 1.45rem; }
.result-meta, .definition-preview { margin: 0; color: var(--muted); font-size: 0.92rem; }
.result-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 0; }
.tag {
    display: inline-flex;
    padding: 0.3rem 0.6rem;
    border-radius: 999px;
    font-size: 0.82rem;
    color: var(--accent);
    background: var(--accent-soft);
}

.loading-state,
.empty-state {
    display: grid;
    place-items: center;
    gap: 10px;
    padding: 36px 20px;
    text-align: center;
    border-radius: 18px;
    background: rgba(148, 163, 184, 0.06);
    border: 1px dashed var(--panel-border-strong);
}
.empty-state h3 { margin: 0; }
.empty-state p, .empty-state ul { margin: 0; color: var(--muted); }
.empty-state ul { padding-left: 18px; text-align: left; }

.spinner {
    width: 38px;
    height: 38px;
    border: 4px solid rgba(148, 163, 184, 0.25);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: wu-spin 0.9s linear infinite;
}
@keyframes wu-spin { to { transform: rotate(360deg); } }

/* ============================
   Side column
   ============================ */
.side-card h2 {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 12px;
    font-size: 1.05rem;
}
.side-card h2 .wu-ico { color: var(--accent); }
.compact-list { margin: 0; padding-left: 18px; color: var(--muted); }
.compact-list li { margin-bottom: 4px; }

.history-item {
    display: grid;
    width: 100%;
    gap: 4px;
    margin-bottom: 10px;
    text-align: left;
    padding: 0.7rem 0.9rem;
    border-radius: 12px;
    color: var(--text);
    background: rgba(148, 163, 184, 0.08);
    border: 1px solid var(--panel-border);
    cursor: pointer;
    transition: border-color 0.15s ease, background 0.15s ease;
}
.history-item:hover,
.history-item:focus-visible {
    outline: none;
    border-color: rgba(110, 168, 254, 0.45);
    background: var(--accent-soft);
}
.history-item span { color: var(--muted); font-size: 0.82rem; }

.definition-card h3 { margin: 0 0 8px; font-size: 1.3rem; }
.definition-meta { color: var(--muted); font-size: 0.85rem; margin: 0 0 6px; }

.muted { color: var(--muted); }

/* ============================
   Info section
   ============================ */
.info-section { grid-auto-rows: 1fr; grid-template-columns: repeat(3, minmax(0, 1fr)); display: grid; gap: 18px; }
.info-card h2 {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 10px;
    font-size: 1.1rem;
}
.info-card h2 .wu-ico { color: var(--accent); }
.info-card ul { margin: 0; padding-left: 18px; color: var(--muted); }
.info-card ul li { margin-bottom: 6px; }
.info-card p { margin: 0 0 8px; color: var(--muted); }

/* ============================
   Focus + responsive tweaks
   ============================ */
button:focus-visible,
input:focus-visible,
select:focus-visible,
a:focus-visible {
    outline: none;
}

@media (max-width: 1120px) {
    .layout { grid-template-columns: 1fr; }
    .filters-row,
    .filters-row-primary { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .summary-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .quick-start-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .info-section { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
    .page-shell { padding: 14px; }
    .hero,
    .search-panel,
    .results-panel,
    .side-card,
    .info-card,
    .app-ad {
        padding: 18px;
        border-radius: 18px;
    }
    .hero { padding: 20px; }
    .primary-search {
        grid-template-columns: 1fr;
    }
    .primary-actions { width: 100%; }
    .primary-button { flex: 1 1 auto; }
    .filters-row,
    .filters-row-primary { grid-template-columns: 1fr; }
    .summary-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .quick-start-grid,
    .info-section { grid-template-columns: 1fr; }
    .results-toolbar,
    .result-main {
        flex-direction: column;
        align-items: flex-start;
    }
    .result-actions { width: 100%; }
    .hero-actions { gap: 8px; }
    .hero-chip { padding: 0.6rem 0.85rem; font-size: 0.88rem; }
}

@media (max-width: 420px) {
    .summary-grid { grid-template-columns: 1fr; }
    .primary-actions { flex-direction: column; align-items: stretch; }
    .ghost-button, .primary-button { width: 100%; }
    .result-actions { justify-content: stretch; }
    .icon-button { flex: 1 1 auto; justify-content: center; }
}