/* Shared tool-site template. Skin per site via :root variables (stamped by build.py). */
@import url('https://fonts.googleapis.com/css2?family=Geist+Mono:wght@400;500&family=Geist:wght@400;500;600;700&display=swap');

:root {
    --bg: #000000;
    --card: #0a0a0a;
    --border: #222222;
    --border-hover: #444444;
    --text: #ededed;
    --muted: #a1a1aa;
    --accent: #a855f7;
    --accent-dim: color-mix(in srgb, #a855f7 12%, transparent);
    --font-sans: 'Geist', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'Geist Mono', "SFMono-Regular", Consolas, Menlo, monospace;
}
:root[data-theme="light"] {
    --bg: #ffffff;
    --card: #fafafa;
    --border: #e5e5e5;
    --border-hover: #a1a1a1;
    --text: #111111;
    --muted: #666666;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* nav */
.top-nav {
    position: sticky; top: 0; z-index: 100;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
}
.nav-inner {
    max-width: 960px; margin: 0 auto; padding: 14px 24px;
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.logo {
    font-family: var(--font-mono); font-weight: 600; font-size: 0.95rem;
    color: var(--text); text-decoration: none;
    display: flex; align-items: center; gap: 8px;
}
.logo-mark {
    width: 24px; height: 24px; border-radius: 6px;
    background: var(--accent); color: #000;
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 0.8rem;
}
nav { display: flex; gap: 20px; }
nav a { font-size: 0.85rem; color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--text); }
#themeToggle {
    background: transparent; border: 1px solid var(--border); color: var(--muted);
    padding: 6px 12px; border-radius: 4px; cursor: pointer;
    font-size: 0.8rem; font-family: var(--font-mono);
}
#themeToggle:hover { border-color: var(--muted); color: var(--text); }

/* layout */
.container { max-width: 960px; margin: 0 auto; padding: 40px 24px 80px; }
.hero { margin-bottom: 28px; }
.hero h1 { font-size: 2.2rem; font-weight: 700; letter-spacing: -0.03em; margin-bottom: 8px; }
.hero .subtitle { color: var(--muted); font-size: 0.95rem; }

/* tool mount */
.tool {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 24px;
    margin-bottom: 28px;
}
.tool-placeholder { color: var(--muted); font-family: var(--font-mono); font-size: 0.85rem; text-align: center; padding: 32px 0; }

/* shared form controls for tools */
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 0.8rem; font-family: var(--font-mono); color: var(--muted); margin-bottom: 6px; }
input[type="text"], input[type="number"], input[type="date"], textarea, select {
    width: 100%; padding: 12px 14px;
    background: var(--bg); border: 1px solid var(--border); border-radius: 6px;
    color: var(--text); font-family: var(--font-sans); font-size: 0.95rem;
}
input:focus, textarea:focus, select:focus { outline: none; border-color: var(--accent); }
.btn {
    background: var(--accent); color: #000; border: none;
    padding: 10px 18px; border-radius: 6px; cursor: pointer;
    font-family: var(--font-mono); font-size: 0.85rem; font-weight: 600;
}
.btn:hover { filter: brightness(1.1); }
.btn-ghost {
    background: transparent; color: var(--text);
    border: 1px solid var(--border); padding: 10px 18px; border-radius: 6px; cursor: pointer;
    font-family: var(--font-mono); font-size: 0.85rem;
}
.btn-ghost:hover { border-color: var(--muted); }

/* seo content */
.seo-content { margin-bottom: 28px; }
.seo-content h2 { font-size: 1.2rem; letter-spacing: -0.01em; margin: 24px 0 10px; }
.seo-content p { color: var(--muted); margin-bottom: 12px; font-size: 0.95rem; }
.seo-content details {
    border: 1px solid var(--border); border-radius: 6px;
    padding: 12px 16px; margin-bottom: 8px; background: var(--card);
}
.seo-content summary { cursor: pointer; font-weight: 600; font-size: 0.9rem; }
.seo-content details p { margin: 8px 0 0; }

/* ads: auto-collapsing slots */
.ad-slot { margin: 0 0 28px; text-align: center; min-height: 0; }
.ad-slot:empty { display: none; }

/* footer */
footer {
    margin-top: 56px; padding-top: 24px;
    border-top: 1px solid var(--border);
    text-align: center; color: var(--muted);
    font-size: 0.8rem; font-family: var(--font-mono);
}
.net-label { text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.68rem; margin-bottom: 6px; }
.net-links { margin-bottom: 14px; }
.net-links a { color: var(--muted); text-decoration: none; }
.net-links a:hover { color: var(--accent); }
.foot-nav { margin-bottom: 10px; }
.foot-nav a, footer a { color: var(--muted); text-decoration: none; }
.foot-nav a:hover { color: var(--text); }
.fine { opacity: 0.7; }

/* plain content pages */
.prose h1 { font-size: 1.8rem; letter-spacing: -0.02em; margin-bottom: 16px; }
.prose h2 { font-size: 1.15rem; margin: 24px 0 8px; }
.prose p, .prose li { color: var(--muted); margin-bottom: 12px; font-size: 0.95rem; }
.prose ul { padding-left: 20px; }
.prose a { color: var(--accent); }

@media (max-width: 640px) {
    .container { padding: 24px 16px 60px; }
    .hero h1 { font-size: 1.7rem; }
    .tool { padding: 16px; }
}

/* ---- calculator pages ---- */
.calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 640px) { .calc-grid { grid-template-columns: 1fr; } }
.calc-actions { margin-top: 20px; display: flex; gap: 10px; flex-wrap: wrap; }
.result-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 24px 0 8px; }
@media (max-width: 640px) { .result-cards { grid-template-columns: 1fr; } }
.result-card { background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 16px; }
.result-card .k { font-size: 0.7rem; font-family: var(--font-mono); color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }
.result-card .v { font-size: 1.35rem; font-weight: 700; margin-top: 4px; }
.result-card .v.accent { color: var(--accent); }
.table-wrap { overflow-x: auto; margin-top: 16px; }
.result-table { width: 100%; border-collapse: collapse; font-size: 0.82rem; }
.result-table th, .result-table td { padding: 8px 10px; border-bottom: 1px solid var(--border); text-align: right; font-family: var(--font-mono); white-space: nowrap; }
.result-table th { color: var(--muted); font-weight: 500; }
.result-table th:first-child, .result-table td:first-child { text-align: left; }
.tool-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin: 4px 0 28px; }
@media (max-width: 640px) { .tool-cards { grid-template-columns: 1fr; } }
.tool-card { display: block; background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 20px; text-decoration: none; color: var(--text); }
.tool-card:hover { border-color: var(--accent); }
.tool-card h3 { font-size: 1rem; margin-bottom: 6px; }
.tool-card p { color: var(--muted); font-size: 0.85rem; margin: 0; }
.disclaimer { font-size: 0.78rem; color: var(--muted); border-left: 3px solid var(--accent); padding: 10px 14px; margin: 24px 0 0; background: var(--card); border-radius: 0 6px 6px 0; }
.formula { font-family: var(--font-mono); background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 12px 16px; margin: 12px 0; font-size: 0.82rem; overflow-x: auto; }

/* ---- font generator ---- */
.generator { margin: 8px 0 8px; }
.generator label { display: block; font-size: 0.8rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); margin-bottom: 8px; }
.generator textarea { width: 100%; box-sizing: border-box; background: var(--card); border: 1px solid var(--border); border-radius: 8px; color: var(--text); padding: 14px 16px; font-size: 1.05rem; line-height: 1.5; resize: vertical; font-family: inherit; }
.generator h2 { margin: 28px 0 4px; font-size: 1.15rem; }
.gen-meta { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; margin-top: 8px; font-size: 0.8rem; color: var(--muted); flex-wrap: wrap; }
.gen-hint strong { color: var(--text); }
.style-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 12px; margin: 14px 0 8px; }
.style-card { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 14px; display: flex; flex-direction: column; gap: 10px; transition: border-color 0.15s; }
.style-card:hover { border-color: var(--accent); }
.style-name { font-size: 0.7rem; font-family: var(--font-mono); color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }
.style-preview { font-size: 1.2rem; line-height: 1.55; word-break: break-word; min-height: 2.7em; }
.style-preview.is-sample { opacity: 0.55; }
.copy-btn { align-self: flex-start; background: var(--accent-dim); color: var(--text); border: 1px solid var(--accent); border-radius: 6px; padding: 7px 18px; font-size: 0.82rem; font-weight: 600; cursor: pointer; transition: background 0.15s, color 0.15s; }
.copy-btn:hover { background: var(--accent); color: #000; }
.copy-btn.copied { background: var(--accent); color: #000; }
#toast { position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%) translateY(16px); background: var(--text); color: var(--bg); padding: 10px 22px; border-radius: 999px; font-size: 0.85rem; font-weight: 600; opacity: 0; pointer-events: none; transition: opacity 0.2s, transform 0.2s; z-index: 50; }
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
@media (max-width: 640px) { .style-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 420px) { .style-grid { grid-template-columns: 1fr; } }