:root {
    --bg:        #0b0d1a;
    --surface:   #14162a;
    --text:      #e9eaf2;
    --muted:     #9aa0bd;
    --border:    rgba(255,255,255,.09);
    --accent:    #6d6af6;
    --highlight: #f4b942;
    --on-hl:     #3a2a00;
    --radius:    14px;
    --maxw:      560px;
    --font-disp: "Space Grotesk", system-ui, sans-serif;
    --font-mono: "Space Mono", ui-monospace, "SF Mono", Menlo, monospace;
}
@media (prefers-color-scheme: light) {
    :root {
        --bg:#f5f6fb; --surface:#ffffff; --text:#1a1c2b; --muted:#5b6076;
        --border:rgba(0,0,0,.1);
    }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
    margin: 0;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;        /* layout-fix: footer ONDER de inhoud, niet ernaast */
    align-items: center;
    justify-content: flex-start;
    padding: clamp(1.5rem, 6vw, 4rem) 1rem;
    padding-left:  max(1rem, env(safe-area-inset-left));
    padding-right: max(1rem, env(safe-area-inset-right));
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-disp);
    line-height: 1.6;
}
main { width: 100%; max-width: var(--maxw); }

/* --- header --- */
.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: .55rem;
    margin-bottom: .4rem;
}
.pi-icon { width: clamp(26px, 7vw, 36px); height: auto; color: var(--accent); flex: none; }
.logo-text {
    margin: 0;
    font-size: clamp(1.6rem, 7vw, 2.4rem);
    font-weight: 700;
    letter-spacing: -.02em;
}
.subtitle {
    text-align: center;
    margin: 0 0 1.75rem;
    color: var(--muted);
    font-size: clamp(.92rem, 3.6vw, 1.02rem);
}

/* --- form --- */
.search-form { width: 100%; }
.search-group { margin-bottom: .7rem; }
.search-input {
    width: 100%;
    padding: .95rem 1.1rem;
    font-family: var(--font-mono);
    font-size: 16px;
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    outline: none;
    transition: border-color .15s, box-shadow .15s;
}
.search-input::placeholder { color: var(--muted); }
.search-input:focus-visible {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 30%, transparent);
}

.btn-container { display: flex; gap: .6rem; }
.main-btn {
    flex: 1 1 0;
    min-height: 48px;
    padding: .8rem 1rem;
    font-family: var(--font-disp);
    font-size: 1rem;
    font-weight: 500;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    transition: transform .08s, background .15s, border-color .15s;
}
.main-btn:hover { border-color: var(--accent); }
.main-btn:active { transform: scale(.98); }
.main-btn--primary { background: var(--accent); border-color: var(--accent); color: #fff; }

@media (max-width: 430px) {
    .btn-container { flex-direction: column; }
}

/* --- result --- */
.result {
    margin-top: 1.5rem;
    padding: 1.1rem 1.2rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.result-label { font-size: .8rem; color: var(--muted); margin-top: .9rem; }
.result-label:first-child { margin-top: 0; }
.result-code {
    font-family: var(--font-mono);
    font-size: clamp(1rem, 4.5vw, 1.15rem);
    word-break: break-all;
    margin-top: .15rem;
}
.result-count { color: var(--muted); font-size: .82rem; }
.result-pos {
    font-family: var(--font-mono);
    font-size: clamp(1.5rem, 8vw, 2rem);
    font-weight: 700;
    margin: .1rem 0;
}
.result-digits {
    font-family: var(--font-mono);
    font-size: .95rem;
    line-height: 2;
    word-break: break-all;
    overflow-wrap: anywhere;
}
.result-hit {
    background: var(--highlight);
    color: var(--on-hl);
    padding: 2px 4px;
    border-radius: 5px;
    font-weight: 700;
}
.result-empty { color: var(--muted); margin: .6rem 0 0; }
.result-empty sup { font-size: .7em; }

/* --- markdown copy --- */
.result-actions { margin-top: 1.1rem; }
.copy-btn {
    font-family: var(--font-disp);
    font-size: .85rem;
    padding: .55rem .95rem;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    transition: border-color .15s, color .15s;
}
.copy-btn:hover { border-color: var(--accent); }
.copy-btn.copied { border-color: var(--accent); color: var(--accent); }

/* --- trending --- */
.trending-container { margin-top: 2rem; }
.trending-title {
    display: flex;
    align-items: center;
    gap: .4rem;
    color: var(--muted);
    font-size: .85rem;
    margin-bottom: .7rem;
}
.trending-title svg { width: 16px; height: 16px; }
.trending-tags { display: flex; flex-wrap: wrap; gap: .5rem; }
.tag {
    padding: .45rem .85rem;
    font-size: .9rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 999px;
    color: var(--text);
    cursor: pointer;
    transition: border-color .15s;
}
.tag:hover { border-color: var(--accent); }

/* --- explainer (dropdown) --- */
.explainer {
    margin-top: 1.75rem;
    border-top: 1px solid var(--border);
    padding-top: 1.25rem;
}
.explainer summary {
    cursor: pointer;
    font-size: .95rem;
    font-weight: 500;
    color: var(--text);
    list-style: none;
    display: flex;
    align-items: center;
    gap: .45rem;
}
.explainer summary::-webkit-details-marker { display: none; }
.explainer summary::before {
    content: "›";
    color: var(--accent);
    font-weight: 700;
    display: inline-block;
    transition: transform .15s;
}
.explainer[open] summary::before { transform: rotate(90deg); }
.explainer-body { margin-top: .85rem; }
.explainer-body p {
    margin: 0 0 .8rem;
    font-size: .92rem;
    line-height: 1.75;
    color: var(--muted);
}
.explainer-body p:last-child { margin-bottom: 0; }
.explainer-body strong { color: var(--text); }
.explainer-body em { font-style: italic; }

/* --- footer --- */
.footer {
    width: 100%;
    max-width: var(--maxw);
    margin-top: 2.5rem;
    padding-top: 1.4rem;
    border-top: 1px solid var(--border);
    text-align: center;
    font-size: .85rem;
    color: var(--muted);
}
.footer p { margin: .35rem 0; }
.footer-files {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: .4rem .85rem;
}
.footer a { color: var(--accent); text-decoration: none; }
.footer a:hover { text-decoration: underline; }
.footer-meta { font-size: .8rem; opacity: .8; }

@media (prefers-reduced-motion: reduce) {
    * { transition: none !important; }
}