/* ============================================================
   AICOPYFIT design system v1
   - tool-first, calm, one accent (cobalt)
   - light + dark (auto via prefers-color-scheme)
   - type: Outfit (self-hosted, latin + latin-ext)
   - radius rule: cards 16 / panels & controls 12 / pills 999
   ============================================================ */

/* ---------- fonts ---------- */
@font-face {
  font-family: "Outfit";
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url("../fonts/outfit-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193,
    U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Outfit";
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url("../fonts/outfit-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF,
    U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020,
    U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

/* ---------- tokens ---------- */
:root {
  --bg: #f5f6f8;
  --panel: #fefdff;
  --panel-2: #f2f4f8;
  --ink: #14171c;
  --ink-soft: #46505e;
  --ink-faint: #6d7786;
  --line: #e3e6ec;
  --line-strong: #ccd2db;
  --accent: #1e4fd8;
  --accent-hover: #183fb3;
  --accent-ink: #ffffff;
  --accent-soft: #eaf0fd;
  --accent-line: #c3d2f6;
  --ok: #157347;
  --ok-soft: #e7f5ee;
  --warn-soft: #fdf3e3;
  --radius-card: 16px;
  --radius-panel: 12px;
  --radius-pill: 999px;
  --shadow-panel: 0 1px 2px rgba(20, 23, 28, 0.05), 0 8px 24px rgba(20, 23, 28, 0.06);
  --font: "Outfit", -apple-system, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101318;
    --panel: #171b21;
    --panel-2: #1d222a;
    --ink: #e8eaee;
    --ink-soft: #a6afbc;
    --ink-faint: #7d8794;
    --line: #272d36;
    --line-strong: #373f4b;
    --accent: #6f96ff;
    --accent-hover: #8badff;
    --accent-ink: #0d1220;
    --accent-soft: #1f2735;
    --accent-line: #34415c;
    --ok: #57c58a;
    --ok-soft: #17251d;
    --warn-soft: #2a241a;
    --shadow-panel: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

/* ---------- base ---------- */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16.5px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
::selection { background: var(--accent-soft); color: var(--ink); }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.wrap-narrow { max-width: 760px; margin: 0 auto; padding: 0 20px; }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
  .fade-up { animation: fadeUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) both; }
  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: none; }
  }
}
@media (prefers-reduced-motion: reduce) {
  .fade-up { animation: none; }
}

h1, h2, h3 { line-height: 1.15; margin: 0; letter-spacing: -0.02em; }
h1 { font-size: clamp(1.9rem, 4.6vw, 2.9rem); font-weight: 700; }
h2 { font-size: clamp(1.35rem, 3vw, 1.7rem); font-weight: 600; }
h3 { font-size: 1.1rem; font-weight: 600; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; gap: 28px; height: 62px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.05rem; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-mark { width: 26px; height: 26px; border-radius: 8px; }
.site-nav { display: flex; gap: 4px; margin-left: auto; }
.site-nav a {
  color: var(--ink-soft); font-size: 0.93rem; font-weight: 500;
  padding: 6px 11px; border-radius: var(--radius-pill); transition: color 0.15s, background 0.15s;
}
.site-nav a:hover { color: var(--ink); background: var(--panel-2); text-decoration: none; }
.site-nav a.current { color: var(--accent); }
@media (max-width: 760px) { .site-nav { display: none; } }

/* ---------- hero ---------- */
.hero { padding: 44px 0 26px; }
.hero h1 { max-width: 17ch; }
.hero .lede {
  margin: 12px 0 0; max-width: 56ch;
  color: var(--ink-soft); font-size: 1.08rem;
}
.hero + .tool-section { margin-top: 10px; }
@media (max-width: 760px) { .hero { padding: 28px 0 8px; } }

/* ---------- tool ---------- */
.tool-section { padding: 18px 0 8px; }
.tool-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-panel);
  padding: 18px;
}
.tool-bar {
  display: flex; align-items: center; flex-wrap: wrap; gap: 10px 16px;
  padding: 2px 2px 14px; border-bottom: 1px solid var(--line);
}
.tool-bar-label { font-size: 0.9rem; font-weight: 600; color: var(--ink-faint); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  appearance: none; cursor: pointer;
  font: inherit; font-size: 0.9rem; font-weight: 500; color: var(--ink-soft);
  background: transparent; border: 1px solid var(--line-strong);
  padding: 6px 14px; border-radius: var(--radius-pill);
  transition: border-color 0.15s, background 0.15s, color 0.15s, transform 0.1s;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip:active { transform: scale(0.97); }
.chip[aria-pressed="true"] {
  background: var(--accent); border-color: var(--accent); color: var(--accent-ink);
  font-weight: 600;
}
.tool-dest { display: flex; align-items: center; gap: 8px; margin-left: auto; color: var(--ink-faint); font-size: 0.9rem; }
.tool-dest strong { color: var(--accent); font-weight: 600; }
@media (max-width: 760px) { .tool-dest { display: none; } }

.tool-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding-top: 14px; }
@media (max-width: 860px) { .tool-grid { grid-template-columns: 1fr; } }

.pane { display: flex; flex-direction: column; min-width: 0; }
.pane-head {
  display: flex; align-items: baseline; gap: 10px; margin-bottom: 8px;
}
.pane-head h2 { font-size: 0.98rem; font-weight: 600; color: var(--ink-soft); }
.pane-meta { font-size: 0.85rem; color: var(--ink-faint); }
.pane-meta.fixed-note { margin-left: auto; }

#src {
  flex: 1; min-height: 260px; resize: vertical;
  font: 0.95rem/1.65 var(--mono);
  color: var(--ink); background: var(--panel-2);
  border: 1px solid var(--line-strong); border-radius: var(--radius-panel);
  padding: 14px 16px;
  transition: border-color 0.15s, box-shadow 0.15s;
}
#src:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
#src::placeholder { color: var(--ink-faint); }

.out {
  flex: 1; min-height: 260px; overflow: auto;
  font-size: 1rem; line-height: 1.7; color: var(--ink);
  background: var(--panel-2);
  border: 1px solid var(--line-strong); border-radius: var(--radius-panel);
  padding: 14px 16px;
}
.out:empty::before {
  content: "Result shows up here as soon as you paste something on the left.";
  color: var(--ink-faint); font-family: var(--font); font-size: 0.95rem;
}
.out.is-plain { font: 0.95rem/1.65 var(--mono); white-space: pre-wrap; word-break: break-word; }
.out.is-html { font: 0.8rem/1.6 var(--mono); white-space: pre-wrap; word-break: break-word; color: var(--ink-soft); }
.out p { margin: 0 0 0.8em; }
.out p:last-child { margin-bottom: 0; }
.out h3, .out h4, .out h5, .out h6 { margin: 1.1em 0 0.4em; letter-spacing: -0.01em; }
.out h3:first-child { margin-top: 0; }
.out ul, .out ol { margin: 0 0 0.8em; padding-left: 1.3em; }
.out li { margin: 0.25em 0; }
.out blockquote {
  margin: 0.6em 0; padding: 0.1em 1em;
  border-left: 3px solid var(--accent); color: var(--ink-soft);
}
.out code {
  font-family: var(--mono); font-size: 0.85em;
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  border-radius: 5px; padding: 0.1em 0.35em;
}
.out pre {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 8px; padding: 12px; overflow: auto; margin: 0.6em 0;
}
.out pre code { background: none; padding: 0; }
.out table { border-collapse: collapse; margin: 0.6em 0; font-size: 0.93em; }
.out th, .out td { border: 1px solid var(--line-strong); padding: 5px 10px; text-align: left; }
.out th { background: var(--panel); }

.tool-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
.btn {
  appearance: none; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: inherit; font-size: 0.95rem; font-weight: 600; white-space: nowrap;
  border-radius: var(--radius-panel); padding: 10px 18px;
  border: 1px solid transparent;
  transition: background 0.15s, border-color 0.15s, transform 0.1s, box-shadow 0.15s;
}
.btn:active { transform: translateY(1px) scale(0.99); }
.btn:focus-visible, .chip:focus-visible, .nav-link:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-ghost { background: transparent; color: var(--ink-soft); border-color: var(--line-strong); font-weight: 500; }
.btn-ghost:hover { color: var(--ink); border-color: var(--line-strong); background: var(--panel-2); }
.btn svg { width: 17px; height: 17px; }

.btn.copied { background: var(--ok-soft); color: var(--ok); border-color: transparent; }

.tool-note {
  margin: 12px 4px 0; font-size: 0.85rem; color: var(--ink-faint);
}
.tool-note a { font-weight: 500; }
.copy-status { color: var(--ok); font-weight: 600; }

.char-count { font-variant-numeric: tabular-nums; }
.char-count.over { color: #b3423a; font-weight: 600; }
@media (prefers-color-scheme: dark) { .char-count.over { color: #ff9d95; } }

/* ---------- sections ---------- */
.section { padding: 56px 0; }
.section-head { max-width: 58ch; margin-bottom: 28px; }
.section-head p { color: var(--ink-soft); margin: 10px 0 0; }

.problems { border-top: 1px solid var(--line); }
.problem-list { display: grid; grid-template-columns: 1fr 1fr; gap: 2px 48px; padding: 0; margin: 0; list-style: none; }
@media (max-width: 760px) { .problem-list { grid-template-columns: 1fr; } }
.problem-list li {
  display: flex; gap: 12px; padding: 14px 0; border-bottom: 1px solid var(--line);
  color: var(--ink-soft); font-size: 0.98rem;
}
.problem-list li strong { color: var(--ink); font-weight: 600; }
.problem-list .tick { flex: none; margin-top: 3px; width: 18px; height: 18px; border-radius: 50%;
  background: var(--ok-soft); color: var(--ok); display: grid; place-items: center; }
.problem-list .tick svg { width: 11px; height: 11px; }

/* before / after demo */
.demo { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 760px) { .demo { grid-template-columns: 1fr; } }
.demo-col {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius-card); overflow: hidden;
}
.demo-col .demo-tag {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px; border-bottom: 1px solid var(--line);
  font-size: 0.85rem; font-weight: 600;
}
.demo-col.before .demo-tag { color: #b3423a; background: var(--warn-soft); }
.demo-col.after .demo-tag { color: var(--ok); background: var(--ok-soft); }
@media (prefers-color-scheme: dark) {
  .demo-col.before .demo-tag { color: #ff9d95; }
}
.demo-col .demo-body { padding: 18px 20px; font-size: 0.98rem; line-height: 1.7; white-space: pre-wrap; }
.demo-col .demo-body strong { font-weight: 600; }
.demo-col .demo-body .junk {
  font-weight: 600; text-decoration: underline wavy #b3423a 1.5px; text-underline-offset: 3px;
}
@media (prefers-color-scheme: dark) { .demo-col .demo-body .junk { text-decoration-color: #ff9d95; } }

/* destination index list */
.dest-list { border-top: 1px solid var(--line); margin: 0; padding: 0; list-style: none; }
.dest-list li { border-bottom: 1px solid var(--line); }
.dest-list a {
  display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 20px;
  padding: 18px 4px; color: inherit;
  transition: background 0.15s;
}
.dest-list a:hover { background: var(--panel-2); text-decoration: none; margin: 0 -12px; padding-left: 16px; padding-right: 12px; border-radius: 10px; }
.dest-name { font-size: 1.05rem; font-weight: 600; }
.dest-sub { color: var(--ink-faint); font-size: 0.95rem; }
.dest-go { color: var(--accent); font-size: 1.4rem; line-height: 1; }
.dest-list img, .dest-list svg { display: none; }
@media (max-width: 640px) {
  .dest-list a { grid-template-columns: 1fr auto; }
  .dest-sub { display: none; }
}

/* two-col explainer rows (word/docs use) */
.fmt-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2px 48px; }
@media (max-width: 760px) { .fmt-grid { grid-template-columns: 1fr; } }
.fmt-item { padding: 16px 0; border-bottom: 1px solid var(--line); }
.fmt-item code {
  font: 0.85em var(--mono); background: var(--panel-2);
  border: 1px solid var(--line); border-radius: 6px; padding: 0.1em 0.4em;
}
.fmt-item p { margin: 4px 0 0; color: var(--ink-soft); font-size: 0.95rem; }
.fmt-item strong { font-weight: 600; }

/* steps */
.steps { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 20px; counter-reset: step; }
@media (max-width: 760px) { .steps { grid-template-columns: 1fr; } }
.step { border-top: 2px solid var(--accent); padding-top: 14px; }
.step::before {
  counter-increment: step; content: counter(step, decimal-leading-zero);
  display: block; font: 600 0.8rem var(--mono); color: var(--accent); margin-bottom: 8px;
}
.step h3 { margin-bottom: 4px; }
.step p { margin: 0; color: var(--ink-soft); font-size: 0.95rem; }

/* privacy strip */
.privacy-strip {
  display: flex; gap: 14px; align-items: center;
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius-card); padding: 18px 22px;
}
.privacy-strip svg { flex: none; width: 22px; height: 22px; color: var(--accent); }
.privacy-strip p { margin: 0; color: var(--ink-soft); font-size: 0.95rem; }
.privacy-strip strong { color: var(--ink); }

/* sibling links */
.siblings { border-top: 1px solid var(--line); padding: 16px 0 64px; }
.siblings .siblings-label { font-size: 0.85rem; color: var(--ink-faint); margin: 0 0 10px; }
.siblings ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.siblings a {
  display: inline-block; font-size: 0.9rem; font-weight: 500;
  border: 1px solid var(--line-strong); border-radius: var(--radius-pill);
  padding: 6px 14px; color: var(--ink-soft);
  transition: border-color 0.15s, color 0.15s;
}
.siblings a:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

/* FAQ */
.faq { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary {
  cursor: pointer; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 18px 0; font-weight: 600; font-size: 1rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: ""; flex: none;
  width: 9px; height: 9px; margin-right: 4px;
  border-right: 2px solid var(--ink-faint); border-bottom: 2px solid var(--ink-faint);
  transform: rotate(45deg); transition: transform 0.2s;
  margin-bottom: 2px;
}
.faq-item[open] summary::after { transform: rotate(225deg); }
.faq-item .faq-a { padding: 0 0 20px; color: var(--ink-soft); max-width: 62ch; }
.faq-item .faq-a p { margin: 0 0 0.6em; }
.faq-item .faq-a p:last-child { margin-bottom: 0; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); margin-top: 40px; }
.site-footer .wrap {
  padding-top: 36px; padding-bottom: 40px;
  display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px;
}
@media (max-width: 760px) { .site-footer .wrap { grid-template-columns: 1fr; gap: 28px; } }
.footer-brand p { color: var(--ink-faint); font-size: 0.9rem; margin: 10px 0 0; max-width: 30ch; }
.footer-col h3 { font-size: 0.85rem; color: var(--ink-faint); font-weight: 600; margin-bottom: 10px; letter-spacing: 0.04em; }
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin: 6px 0; }
.footer-col a { color: var(--ink-soft); font-size: 0.93rem; }
.footer-col a:hover { color: var(--accent); }
.footer-legal { border-top: 1px solid var(--line); }
.footer-legal .wrap {
  display: flex; gap: 12px; align-items: center; justify-content: space-between;
  padding-top: 16px; padding-bottom: 16px;
  color: var(--ink-faint); font-size: 0.85rem;
}
@media (max-width: 640px) { .footer-legal .wrap { flex-direction: column; align-items: flex-start; gap: 4px; } }

/* misc */
[hidden] { display: none !important; }
.noscript-note {
  background: var(--warn-soft); color: var(--ink);
  padding: 12px 20px; text-align: center; font-size: 0.95rem;
}
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}