/* AIQandA — single stylesheet. Restyle = edit this file only.
   The producer HTML carries no styling; every rule below targets the fixed
   qa- vocabulary or the page shell this app wraps around it. */

:root {
  --bg:        #fbfbfa;
  --surface:   #ffffff;
  --ink:       #16161a;
  --ink-soft:  #4a4a52;
  --ink-faint: #86868b;
  --line:      #e6e6e3;
  --line-soft: #f0f0ed;
  --accent:    #4f46e5;
  --accent-ink:#4338ca;

  --serif: ui-serif, "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --measure: 40rem;      /* ~65 characters */
  --rail: 15rem;
  --gap: 3.5rem;
  --radius: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #0e0e10;
    --surface:   #17171a;
    --ink:       #ececee;
    --ink-soft:  #b3b3ba;
    --ink-faint: #7b7b83;
    --line:      #262629;
    --line-soft: #1d1d20;
    --accent:    #8b83ff;
    --accent-ink:#a79fff;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent-ink); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }

.wrap { width: 100%; max-width: 62rem; margin: 0 auto; padding: 0 1.5rem; }

/* ---- header ---- */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 3.75rem;
}
.wordmark {
  font-weight: 700; font-size: 1.15rem; letter-spacing: -0.02em;
  color: var(--ink); text-decoration: none;
}
.wordmark:hover { text-decoration: none; }
.wordmark-ai { color: var(--accent); }
.lang-switch {
  display: inline-flex; gap: 3px; padding: 3px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 999px;
}
.lang-opt {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--ink-faint);
  padding: 0.3rem 0.7rem; border-radius: 999px;
  transition: color .15s ease, background .15s ease;
}
.lang-opt:hover { color: var(--ink); text-decoration: none; }
.lang-opt-active { color: #fff; background: var(--accent); }
.lang-opt-active:hover { color: #fff; }
.flag { display: block; width: 20px; height: 14px; border-radius: 3px; flex: none; }

/* ---- layout ---- */
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--rail);
  gap: var(--gap);
  align-items: start;
  padding-top: 3rem;
  padding-bottom: 4rem;
}
.content { min-width: 0; max-width: var(--measure); }
.rail { position: sticky; top: 5.5rem; }

@media (max-width: 56rem) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .rail { position: static; margin-top: 1rem; }
}

/* ---- intro ---- */
.intro { margin-bottom: 3rem; }
.intro-kicker {
  font-family: var(--mono); font-size: 0.78rem; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--accent-ink); margin: 0 0 0.9rem;
}
.intro-text { font-size: 1.22rem; line-height: 1.55; color: var(--ink-soft); margin: 0; }

/* ---- section labels ---- */
.section-label {
  font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.12em; color: var(--ink-faint);
  margin: 0 0 1.25rem; padding-bottom: 0.6rem; border-bottom: 1px solid var(--line);
}
.archive-label { margin-top: 3.5rem; }
.archive-month {
  font-size: 0.95rem; font-weight: 600; color: var(--ink-soft);
  margin: 2rem 0 1rem;
}

/* ---- cards ---- */
.card-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.6rem; }
.card { margin: 0; }
.card-link {
  display: block; padding: 1.4rem 1.5rem;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); color: inherit;
  transition: border-color .15s ease, transform .15s ease;
}
.card-link:hover {
  text-decoration: none; border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
  transform: translateY(-1px);
}
.card-meta, .article-meta {
  display: flex; align-items: center; gap: 0.7rem;
  font-family: var(--mono); font-size: 0.72rem; color: var(--ink-faint);
  margin-bottom: 0.6rem;
}
.card-question {
  font-size: 1.28rem; line-height: 1.28; letter-spacing: -0.015em;
  margin: 0 0 0.5rem; color: var(--ink);
}
.card-teaser { margin: 0 0 0.9rem; color: var(--ink-soft); font-size: 0.98rem; }
.card-cta {
  font-family: var(--mono); font-size: 0.74rem; color: var(--accent-ink);
  text-transform: uppercase; letter-spacing: 0.05em;
}

/* ---- tag chips ---- */
.tag-chip {
  font-family: var(--mono); font-size: 0.68rem; text-transform: lowercase;
  letter-spacing: 0.02em; color: var(--ink-soft);
  padding: 0.15rem 0.5rem; border: 1px solid var(--line);
  border-radius: 6px; background: var(--bg); white-space: nowrap;
}
.tag-chip-active { color: #fff; background: var(--accent); border-color: var(--accent); }

/* ---- rail ---- */
.rail-card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.2rem 1.25rem;
}
.rail-title {
  font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--ink-faint); margin: 0 0 0.9rem;
}
.tag-list { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.4rem; }

/* ---- article ---- */
.breadcrumb { font-family: var(--mono); font-size: 0.78rem; margin: 0 0 1.75rem; }
.breadcrumb a { color: var(--ink-faint); }
.breadcrumb a:hover { color: var(--ink); }
.article-figure { margin: 0 0 2rem; }
.article-figure img {
  width: 100%; height: auto; border-radius: var(--radius); display: block;
  border: 1px solid var(--line);
}
.article-figure.has-title { position: relative; }
.article-figure-title {
  position: absolute; left: 0; right: 0; bottom: 0; margin: 0;
  padding: 2.6rem 1.4rem 1.15rem;
  font-family: var(--serif); font-weight: 700;
  font-size: clamp(1.3rem, 4.6vw, 2.05rem); line-height: 1.15;
  color: #fff;
  border-bottom-left-radius: var(--radius); border-bottom-right-radius: var(--radius);
  background: linear-gradient(to top,
    rgba(0,0,0,0.74) 0%, rgba(0,0,0,0.58) 42%, rgba(0,0,0,0) 100%);
  text-shadow: 0 1px 6px rgba(0,0,0,0.45);
}
/* the hero title is over the image, so hide the duplicate one inside the fragment */
.has-hero .qa-question { display: none; }
.article-meta { margin-bottom: 1.5rem; }

/* the fixed qa- vocabulary from the producer fragment */
.qa-article { display: block; }
.qa-header { margin: 0 0 1.75rem; }
.qa-question {
  font-family: var(--serif);
  font-size: 2.15rem; line-height: 1.12; letter-spacing: -0.02em;
  font-weight: 600; margin: 0 0 0.75rem; color: var(--ink);
}
.qa-teaser { font-size: 1.2rem; line-height: 1.5; color: var(--ink-soft); margin: 0; }
.qa-answer { font-size: 1.06rem; line-height: 1.75; }
.qa-paragraph { margin: 0 0 1.35rem; color: var(--ink); }
.qa-subheading {
  font-size: 1.35rem; letter-spacing: -0.01em; font-weight: 600;
  margin: 2.4rem 0 1rem; color: var(--ink);
}
.qa-aside {
  margin: 2rem 0; padding: 1.1rem 1.4rem;
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 6%, var(--surface));
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 1.12rem; font-style: italic; color: var(--ink-soft);
}
.qa-aside p { margin: 0; }
.qa-list { margin: 0 0 1.35rem; padding-left: 1.3rem; }
.qa-list-item { margin: 0 0 0.5rem; }

/* ---- footer ---- */
.site-footer { border-top: 1px solid var(--line); padding: 2.5rem 0; margin-top: 2rem; }
.site-footer .wrap { display: flex; align-items: baseline; gap: 1rem; flex-wrap: wrap; }
.footer-mark { font-weight: 700; letter-spacing: -0.02em; }
.footer-note { font-size: 0.9rem; color: var(--ink-faint); }

/* ---- chat assistant (mobile first) ---- */
.chat-fab {
  position: fixed; right: 1rem; z-index: 60;
  bottom: calc(1rem + env(safe-area-inset-bottom, 0px));
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.7rem 1.1rem; border: none; border-radius: 999px; cursor: pointer;
  background: var(--accent); color: #fff;
  font-family: var(--sans); font-size: 0.95rem; font-weight: 600;
  box-shadow: 0 6px 22px rgba(0,0,0,0.22);
}
.chat-fab:hover { background: var(--accent-ink); }
.chat-fab-label { display: inline; }
body.chat-open .chat-fab { display: none; }

.chat-sheet {
  position: fixed; inset: 0; z-index: 70;
  display: flex; flex-direction: column;
  background: var(--bg);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
.chat-sheet[hidden] { display: none; }

.chat-head {
  flex: 0 0 auto; display: flex; align-items: center; justify-content: space-between;
  padding: calc(0.9rem + env(safe-area-inset-top, 0px)) 1.1rem 0.9rem;
  border-bottom: 1px solid var(--line); background: var(--surface);
}
.chat-title {
  font-family: var(--mono); font-size: 0.78rem; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--ink-faint);
}
.chat-close {
  border: none; background: none; color: var(--ink-soft);
  font-size: 1.7rem; line-height: 1; cursor: pointer; padding: 0 0.25rem;
}

.chat-log {
  flex: 1 1 auto; overflow-y: auto; -webkit-overflow-scrolling: touch;
  padding: 1rem; display: flex; flex-direction: column; gap: 0.75rem;
}
.chat-msg { display: flex; }
.chat-msg-user { justify-content: flex-end; }
.chat-msg-bot { justify-content: flex-start; }
.chat-bubble {
  max-width: 85%; padding: 0.7rem 0.9rem; border-radius: 16px;
  font-size: 1rem; line-height: 1.55; word-wrap: break-word; overflow-wrap: anywhere;
}
.chat-msg-user .chat-bubble {
  background: var(--accent); color: #fff; border-bottom-right-radius: 5px;
}
.chat-msg-bot .chat-bubble {
  background: var(--surface); color: var(--ink);
  border: 1px solid var(--line); border-bottom-left-radius: 5px;
}
.chat-msg-error .chat-bubble { color: var(--ink-faint); font-style: italic; }

.chat-sources { margin-top: 0.65rem; display: flex; flex-direction: column; gap: 0.3rem; }
.chat-sources-label {
  font-family: var(--mono); font-size: 0.64rem; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--ink-faint);
}
.chat-source {
  font-size: 0.9rem; color: var(--accent-ink);
  padding: 0.3rem 0.55rem; border: 1px solid var(--line); border-radius: 8px;
  background: var(--bg);
}
.chat-source:hover { border-color: var(--accent); text-decoration: none; }

.chat-typing { display: inline-flex; gap: 4px; padding: 0.15rem 0; }
.chat-typing i {
  width: 6px; height: 6px; border-radius: 50%; background: var(--ink-faint);
  display: inline-block; animation: chat-blink 1.2s infinite both;
}
.chat-typing i:nth-child(2) { animation-delay: 0.2s; }
.chat-typing i:nth-child(3) { animation-delay: 0.4s; }
@keyframes chat-blink { 0%, 80%, 100% { opacity: 0.25; } 40% { opacity: 1; } }

.chat-form {
  flex: 0 0 auto; display: flex; align-items: flex-end; gap: 0.5rem;
  padding: 0.75rem 0.9rem calc(0.75rem + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid var(--line); background: var(--surface);
}
.chat-input {
  flex: 1 1 auto; resize: none; max-height: 140px; box-sizing: border-box;
  font-family: var(--sans); font-size: 1rem; line-height: 1.4; color: var(--ink);
  background: var(--bg); border: 1px solid var(--line); border-radius: 14px;
  padding: 0.6rem 0.8rem;
}
.chat-input:focus { outline: none; border-color: var(--accent); }
.chat-send {
  flex: 0 0 auto; width: 44px; height: 44px; border: none; border-radius: 50%;
  background: var(--accent); color: #fff; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
}
.chat-send:hover { background: var(--accent-ink); }

/* desktop: dock as a floating panel instead of full screen */
@media (min-width: 640px) {
  .chat-sheet {
    inset: auto; right: 1.25rem; bottom: 1.25rem;
    width: 390px; height: min(70vh, 620px);
    border: 1px solid var(--line); border-radius: var(--radius);
    box-shadow: 0 18px 50px rgba(0,0,0,0.28); overflow: hidden;
  }
  .chat-head { padding: 0.9rem 1.1rem; }
  body.chat-open { overflow: auto; }
}

/* mobile: lock the page behind the full-screen sheet */
@media (max-width: 639px) {
  body.chat-open { overflow: hidden; }
}

.chat-head-actions { display: flex; align-items: center; gap: 0.6rem; }
.chat-new {
  border: 1px solid var(--line); background: var(--bg); color: var(--ink-soft);
  font-family: var(--mono); font-size: 0.64rem; text-transform: uppercase;
  letter-spacing: 0.08em; border-radius: 999px; padding: 0.28rem 0.6rem; cursor: pointer;
}
.chat-new:hover { color: var(--ink); border-color: var(--accent); }

/* ---- admin ---- */
.admin { max-width: 780px; margin: 0 auto; padding: 1.5rem 1rem 4rem; }
.admin-title { font-family: var(--sans); font-size: 1.3rem; margin: 0 0 1.25rem; }
.admin-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.9rem; }
.admin-item {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface); padding: 0.9rem 1rem;
}
.admin-meta { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 0.55rem; }
.admin-date { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-faint); }
.admin-en {
  display: block; font-family: var(--serif); font-size: 1.05rem;
  color: var(--ink); margin-bottom: 0.75rem;
}
.admin-del {
  display: flex; align-items: center; justify-content: space-between;
  gap: 0.75rem; flex-wrap: wrap;
}
.admin-slug { font-family: var(--mono); font-size: 0.68rem; color: var(--ink-faint); word-break: break-all; }
.admin-del-btn {
  flex: 0 0 auto; border: none; border-radius: 8px; background: #b3261e; color: #fff;
  font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.06em; padding: 0.5rem 0.9rem; cursor: pointer;
}
.admin-del-btn:hover { background: #8f1e17; }