/* ==========================================================================
   VibeDrone shared design system
   Used by: POSITIONING.html, research/*, industries/*, case-studies/*, etc.
   Conventions:
   - Light primary, dark accent islands (hero, team, model sections)
   - Single orange accent. Auxiliary: violet, cyan, yellow for categorical use
   - Type scale: clamp()-driven, optimized 320px → 1440px
   - Vertical rhythm: 120px section padding desktop → 72px mobile
   - All components flexbox/grid; no layout frameworks
   ========================================================================== */

:root {
  --bg: #ffffff;
  --ink: #0c0e12;
  --ink-2: #22262e;
  --ink-3: #484e59;
  --ink-4: #6b707b;
  --ink-5: #9aa0ab;
  --line: #e7e9ee;
  --line-2: #d8dce3;
  --surface: #f6f7f9;
  --surface-2: #eef0f4;
  --surface-3: #fafbfc;

  --accent: #ff5a1f;
  --accent-2: #ffb071;
  --accent-bg: rgba(255, 90, 31, 0.08);

  --dark: #0a0b0f;
  --dark-2: #13151b;
  --dark-3: #1c1f27;
  --dark-4: #272b35;
  --dark-ink: #f2f3f5;
  --dark-ink-2: #a7abb5;
  --dark-ink-3: #6a6f79;
  --dark-line: #1f232b;

  --cyan: #0fa978;
  --violet: #7a6cff;
  --yellow: #c99000;
  --red: #e04a3c;

  --serif: "Source Serif Pro", ui-serif, "Iowan Old Style", "Apple Garamond", Baskerville, "Times New Roman", serif;
  --sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 22px;

  --max: 1200px;
  --max-narrow: 960px;
  --max-article: 760px;
}

/* Reset & base ------------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;  /* safety: prevent any single element from breaking the page width */
}
img, svg, video { max-width: 100%; display: block; height: auto; }
a { color: inherit; }
code, .mono { font-family: var(--mono); }
p { margin: 0; }
h1, h2, h3, h4, h5, h6 { margin: 0; font-weight: 600; letter-spacing: -0.02em; }

/* Containers ------------------------------------------------------------- */
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 28px; }
.wrap-narrow { max-width: var(--max-narrow); margin: 0 auto; padding: 0 28px; }
.wrap-article { max-width: var(--max-article); margin: 0 auto; padding: 0 28px; }

@media (max-width: 640px) {
  .wrap, .wrap-narrow, .wrap-article { padding: 0 20px; }
}

/* Typography ------------------------------------------------------------- */
h1 { font-size: clamp(36px, 6.8vw, 88px); line-height: 1.02; letter-spacing: -0.035em; font-weight: 500; }
h2 { font-size: clamp(28px, 4.2vw, 54px); line-height: 1.06; letter-spacing: -0.028em; font-weight: 500; }
h3 { font-size: clamp(20px, 2.4vw, 24px); line-height: 1.3; font-weight: 600; }
h4 { font-size: 17px; line-height: 1.35; font-weight: 600; }

.kicker {
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-4);
  font-weight: 600;
  margin-bottom: 18px;
}

.lead {
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.52;
  color: var(--ink-3);
  max-width: 680px;
}

/* Academic / research typography ---------------------------------------- */
.article {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.7;
  color: var(--ink-2);
}
.article h2, .article h3, .article h4 { font-family: var(--sans); }
.article h2 { margin: 56px 0 20px; font-size: clamp(24px, 2.6vw, 30px); letter-spacing: -0.02em; }
.article h3 { margin: 36px 0 14px; font-size: 19px; color: var(--ink); }
.article h4 { margin: 28px 0 10px; font-size: 16px; color: var(--ink-2); text-transform: none; letter-spacing: 0; }
.article p { margin: 0 0 20px; overflow-wrap: break-word; word-wrap: break-word; hyphens: auto; }
.article p + p { margin-top: -6px; }
.article ol, .article ul { padding-left: 24px; margin: 0 0 24px; }
.article ol li, .article ul li { margin-bottom: 8px; }
.article a { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.article a:hover { color: var(--ink); }
.article code { background: var(--surface); padding: 2px 6px; border-radius: 4px; font-size: 0.88em; color: var(--ink); border: 1px solid var(--line); }
.article pre { background: var(--dark-2); color: var(--dark-ink); padding: 18px 22px; border-radius: var(--radius); font-family: var(--mono); font-size: 14px; line-height: 1.65; overflow-x: auto; margin: 20px 0 28px; }
.article blockquote { border-left: 3px solid var(--accent); padding: 2px 0 2px 20px; margin: 24px 0; color: var(--ink-3); font-style: italic; }
.article .small { font-size: 14px; color: var(--ink-4); font-family: var(--sans); }

/* Equation block (KaTeX/MathJax friendly) */
.equation {
  margin: 24px 0;
  padding: 22px 26px;
  background: var(--surface-3);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  overflow-x: auto;
  font-family: var(--serif);
}
.equation .eq { text-align: center; font-size: 17px; }
.equation .eq-label { font-size: 12px; color: var(--ink-4); text-align: right; margin-top: 10px; font-family: var(--sans); letter-spacing: 0.04em; }

/* Figures */
.figure {
  margin: 32px -28px;
  padding: 28px;
  background: var(--surface-3);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
}
@media (max-width: 640px) {
  .figure { margin: 28px -20px; padding: 24px 20px; }
}
.figure .fig-body { max-width: 100%; margin: 0 auto; }
.figure .fig-caption {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-4);
  margin-top: 18px;
  line-height: 1.5;
  max-width: var(--max-article);
  margin-left: auto;
  margin-right: auto;
}
.figure .fig-caption strong { color: var(--ink); font-weight: 600; margin-right: 6px; }

/* Tables */
table.tbl { width: 100%; border-collapse: collapse; margin: 24px 0; font-family: var(--sans); font-size: 14px; }
table.tbl th, table.tbl td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.tbl th { font-weight: 600; color: var(--ink); background: var(--surface-3); font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; }
table.tbl td { color: var(--ink-2); }
table.tbl tr:last-child td { border-bottom: 0; }

/* Reference list */
.refs {
  margin: 48px 0 24px;
  padding: 28px 0 0;
  border-top: 1px solid var(--line);
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink-3);
}
.refs h3 { font-family: var(--sans); margin-bottom: 20px; }
.refs ol { padding-left: 24px; }
.refs ol li { margin-bottom: 14px; line-height: 1.55; }
.refs .ref-id { color: var(--ink-4); font-family: var(--mono); font-size: 13px; margin-right: 6px; }

/* Nav ------------------------------------------------------------------- */
nav.top {
  position: sticky; top: 0; z-index: 40;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--line);
}
nav.top .inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px; max-width: 1320px; margin: 0 auto; padding: 0 28px;
}
nav.top .brand {
  font-weight: 700; font-size: 16px; letter-spacing: -0.02em;
  display: inline-flex; align-items: center; gap: 5px; color: var(--ink); text-decoration: none;
  font-family: var(--sans);
}
nav.top .brand .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent); display: inline-block;
  box-shadow: 0 0 0 3px rgba(255,90,31,0.12);
}
nav.top .links { display: flex; gap: 28px; font-size: 14px; color: var(--ink-3); }
nav.top .links a { text-decoration: none; color: inherit; }
nav.top .links a:hover, nav.top .links a[aria-current="page"] { color: var(--ink); }
nav.top .right { display: flex; align-items: center; gap: 16px; }
nav.top .signin { font-size: 14px; color: var(--ink-3); text-decoration: none; }
nav.top .signin:hover { color: var(--ink); }
nav.top .btn-nav {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 14px; background: var(--ink); color: #fff;
  font-size: 13.5px; font-weight: 500; border-radius: 7px; text-decoration: none;
}
nav.top .btn-nav:hover { background: #1a1d25; }
nav.top .menu-btn {
  display: none; background: transparent; border: 1px solid var(--line);
  width: 38px; height: 38px; border-radius: 8px; color: var(--ink);
  align-items: center; justify-content: center; cursor: pointer;
}
@media (max-width: 820px) {
  nav.top .links, nav.top .signin { display: none; }
  nav.top .menu-btn { display: inline-flex; }
  nav.top .inner { padding: 0 20px; }
}

/* Buttons --------------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 20px;
  font-family: var(--sans);
  font-size: 14.5px; font-weight: 600; line-height: 1;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer; text-decoration: none; white-space: nowrap;
  transition: background 0.15s, border 0.15s, color 0.15s, transform 0.15s;
}
.btn.sm { padding: 9px 14px; font-size: 13px; font-weight: 500; }
.btn.lg { padding: 15px 22px; font-size: 15px; }

.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: #1a1d25; }

.btn-invert { background: #fff; color: var(--ink); }
.btn-invert:hover { background: #ededed; }

.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line-2); }
.btn-ghost:hover { border-color: var(--ink); }

.btn-ghost-dark { background: transparent; color: var(--dark-ink); border-color: rgba(255,255,255,0.18); }
.btn-ghost-dark:hover { border-color: rgba(255,255,255,0.45); background: rgba(255,255,255,0.04); }

.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: #e44c14; }

.inline-cta {
  display: inline-block;
  color: var(--ink); font-size: 14.5px; font-weight: 500; text-decoration: none;
  border-bottom: 1px solid var(--ink); padding-bottom: 2px; transition: color 0.15s, border-color 0.15s;
}
.inline-cta:hover { color: var(--accent); border-color: var(--accent); }
.inline-cta.on-dark { color: #fff; border-bottom-color: rgba(255,255,255,0.6); }
.inline-cta.on-dark:hover { color: var(--accent-2); border-color: var(--accent-2); }

@media (max-width: 520px) {
  .btn { width: 100%; justify-content: center; }
  .hero-ctas .btn { flex: 1 1 100%; }
}

/* Sections -------------------------------------------------------------- */
section { padding: 120px 0; border-top: 1px solid var(--line); }
section:first-of-type { border-top: 0; }
@media (max-width: 860px) { section { padding: 80px 0; } }
@media (max-width: 520px) { section { padding: 64px 0; } }

.dark-section { background: var(--dark); color: var(--dark-ink); }
.dark-section .kicker { color: var(--dark-ink-3); }
.dark-section h1, .dark-section h2, .dark-section h3 { color: #fff; }
.dark-section .lead { color: var(--dark-ink-2); }

/* Hero ------------------------------------------------------------------ */
.hero {
  background: var(--dark);
  color: var(--dark-ink);
  padding: 120px 0 80px;
  border-top: 0;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: -20% auto auto -15%; width: 900px; height: 900px;
  background: radial-gradient(closest-side, rgba(255,90,31,0.22), transparent 70%);
  pointer-events: none; filter: blur(20px);
}
.hero::after {
  content: ""; position: absolute; inset: auto -15% -30% auto; width: 720px; height: 720px;
  background: radial-gradient(closest-side, rgba(122,108,255,0.18), transparent 70%);
  pointer-events: none; filter: blur(20px);
}
.hero .wrap { position: relative; z-index: 2; }
.hero h1 { color: #fff; max-width: 16ch; margin-bottom: 26px; }
.hero h1 em { font-style: normal; color: var(--accent-2); }
.hero .lede {
  font-size: clamp(16px, 2.1vw, 20px);
  color: var(--dark-ink-2);
  max-width: 620px; margin: 0 0 40px; line-height: 1.5;
}
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }

@media (max-width: 860px) { .hero { padding: 80px 0 64px; } }
@media (max-width: 520px) { .hero { padding: 64px 0 48px; } .hero h1 { margin-bottom: 20px; } }

/* Feature rows ---------------------------------------------------------- */
.feature { display: grid; grid-template-columns: 1fr 1.1fr; gap: 80px; align-items: center; }
.feature.reverse { grid-template-columns: 1.1fr 1fr; }
.feature.reverse .text { order: 2; }
@media (max-width: 980px) {
  .feature { grid-template-columns: 1fr; gap: 40px; }
  .feature.reverse .text { order: initial; }
}
.feature h2 { max-width: 16ch; margin-bottom: 18px; }
.feature .text p { font-size: 17px; color: var(--ink-3); max-width: 520px; margin-bottom: 20px; }
.feature .mini { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 22px; max-width: 500px; }
.feature .mini div { background: var(--surface); border-radius: var(--radius); padding: 14px 16px; font-size: 13px; color: var(--ink-3); border: 1px solid var(--line); }
.feature .mini div strong { color: var(--ink); font-weight: 600; display: block; font-size: 14px; margin-bottom: 2px; }

/* Panels (feature visuals) --------------------------------------------- */
.panel {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg);
  overflow: hidden; min-height: 340px; position: relative;
}
.panel .panel-head {
  padding: 14px 18px; border-bottom: 1px solid var(--line);
  font-size: 12.5px; color: var(--ink-4);
  letter-spacing: 0.08em; text-transform: uppercase;
  display: flex; align-items: center; gap: 10px; background: #fcfcfd;
}
.panel .panel-body { padding: 22px; font-family: var(--mono); font-size: 13.5px; color: var(--ink-2); line-height: 1.8; }
.panel.dark { background: var(--dark-2); border-color: var(--dark-line); color: var(--dark-ink); }
.panel.dark .panel-head { background: var(--dark); color: var(--dark-ink-3); border-color: var(--dark-line); }
.panel.dark .panel-body { color: var(--dark-ink); }

.spec-row { display: flex; justify-content: space-between; gap: 12px; padding: 7px 0; border-bottom: 1px dashed var(--line); font-family: var(--mono); font-size: 13px; }
.spec-row:last-child { border-bottom: 0; }
.spec-row .k { color: var(--ink-4); }
.spec-row .v { color: var(--ink); font-weight: 600; text-align: right; }

.check-row { display: flex; align-items: center; gap: 10px; padding: 8px 0; font-size: 13.5px; color: var(--ink-3); font-family: var(--mono); }
.check-row .dot { width: 14px; height: 14px; border-radius: 50%; flex-shrink: 0; color: #fff; display: inline-flex; align-items: center; justify-content: center; font-size: 9px; font-family: var(--sans); }
.check-row .ok { background: var(--cyan); }
.check-row .warn { background: #f0a51a; }
.check-row .fail { background: var(--red); }

/* Footer ---------------------------------------------------------------- */
footer.site { padding: 80px 0 60px; background: var(--surface); border-top: 1px solid var(--line); color: var(--ink-4); font-size: 13.5px; }
footer.site .cols { display: grid; grid-template-columns: 1.3fr repeat(4, 1fr); gap: 40px; }
@media (max-width: 860px) { footer.site .cols { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { footer.site .cols { grid-template-columns: 1fr; gap: 28px; } }
footer.site h5 { font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink); font-weight: 600; margin: 0 0 14px; }
footer.site ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
footer.site ul a { text-decoration: none; color: var(--ink-4); }
footer.site ul a:hover { color: var(--ink); }
footer.site .brand-block p { font-size: 13px; max-width: 260px; margin-top: 8px; line-height: 1.55; }
footer.site .bottom { margin-top: 60px; padding-top: 24px; border-top: 1px solid var(--line-2); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; align-items: center; }
footer.site .bottom .small { font-size: 12px; }
footer.site .bottom a { text-decoration: none; color: inherit; margin-right: 16px; }
footer.site .bottom a:hover { color: var(--ink); }

/* Breadcrumbs ---------------------------------------------------------- */
.breadcrumbs { font-size: 13px; color: var(--ink-4); margin-bottom: 32px; }
.breadcrumbs a { color: inherit; text-decoration: none; border-bottom: 1px solid transparent; }
.breadcrumbs a:hover { color: var(--ink); border-color: var(--ink); }
.breadcrumbs span { margin: 0 8px; color: var(--ink-5); }

/* Page hero (for sub-pages) ------------------------------------------- */
.page-hero { padding: 100px 0 60px; border-bottom: 1px solid var(--line); }
.page-hero h1 { font-size: clamp(36px, 5vw, 64px); max-width: 20ch; margin-bottom: 22px; }
.page-hero p.lead { max-width: 680px; }
.page-hero .meta { margin-top: 32px; display: flex; gap: 24px; flex-wrap: wrap; font-size: 13px; color: var(--ink-4); }
.page-hero .meta span { display: inline-flex; align-items: center; gap: 6px; }
@media (max-width: 820px) { .page-hero { padding: 72px 0 48px; } }

/* Cards ----------------------------------------------------------------- */
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.card:hover { transform: translateY(-2px); border-color: var(--line-2); box-shadow: 0 12px 40px rgba(10,11,15,0.06); }
.card h3 { margin-bottom: 10px; letter-spacing: -0.01em; }
.card p { color: var(--ink-3); font-size: 15px; }
.card .tag {
  display: inline-block; padding: 4px 10px; font-size: 11px;
  letter-spacing: 0.12em; text-transform: uppercase; border-radius: 999px;
  margin-bottom: 14px; font-weight: 600;
}
.tag-orange { background: var(--accent-bg); color: var(--accent); }
.tag-violet { background: rgba(122,108,255,0.1); color: var(--violet); }
.tag-cyan { background: rgba(15,169,120,0.1); color: var(--cyan); }
.tag-yellow { background: rgba(201,144,0,0.1); color: var(--yellow); }
.tag-ink { background: var(--surface-2); color: var(--ink-2); }

/* Utility --------------------------------------------------------------- */
.faint { color: var(--ink-4); }
.mono { font-family: var(--mono); }
.badge {
  display: inline-block; padding: 4px 10px; font-size: 11px;
  letter-spacing: 0.1em; text-transform: uppercase;
  border-radius: 999px; font-weight: 600;
  background: var(--surface-2); color: var(--ink-2);
}
.divider { border: 0; border-top: 1px solid var(--line); margin: 0; }

/* Chips (hero) */
.chips { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 28px; }
.chip {
  padding: 7px 12px; background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 999px; font-size: 13px; color: var(--dark-ink-2);
}
.chip strong { color: #fff; font-weight: 500; }

/* Pull quote ----------------------------------------------------------- */
.pull {
  font-size: clamp(22px, 3.2vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.02em;
  max-width: 820px;
  color: var(--ink);
  font-weight: 500;
  margin: 0;
}
.pull em { font-style: normal; color: var(--accent); }

/* IDE showcase (landing hero + product page) -------------------------- */
.ide {
  background: var(--dark-2);
  border: 1px solid var(--dark-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  color: var(--dark-ink);
  font-family: var(--mono);
  font-size: 12.5px;
  position: relative;
  box-shadow: 0 40px 100px -20px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.04);
}
.ide-bar {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 16px; background: var(--dark);
  border-bottom: 1px solid var(--dark-line);
  font-family: var(--sans); font-size: 12.5px;
}
.ide-bar .traffic { display: flex; gap: 7px; }
.ide-bar .traffic span { width: 11px; height: 11px; border-radius: 50%; background: #272b35; }
.ide-bar .project {
  color: var(--dark-ink-2); display: flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 12px;
}
.ide-bar .project strong { color: var(--dark-ink); font-weight: 500; }
.ide-bar .project .dot { color: var(--dark-ink-3); }
.ide-bar .stages { display: flex; gap: 2px; margin-left: auto; margin-right: 14px; font-family: var(--sans); font-size: 11.5px; }
.ide-bar .stages .stg {
  padding: 5px 10px; color: var(--dark-ink-3);
  border-radius: 5px; letter-spacing: 0.04em;
}
.ide-bar .stages .stg.done { color: var(--dark-ink-2); }
.ide-bar .stages .stg.now { background: var(--accent); color: #fff; font-weight: 600; }
.ide-bar .actions { display: flex; gap: 8px; }
.ide-bar .actions button {
  background: var(--dark-3); color: var(--dark-ink); border: 1px solid var(--dark-line);
  padding: 6px 12px; font-size: 12px; border-radius: 6px;
  font-family: var(--sans); cursor: default;
}
.ide-bar .actions button.pri { background: var(--accent); color: #fff; border-color: var(--accent); font-weight: 500; }

@media (max-width: 820px) {
  .ide-bar .stages { display: none; }
  .ide-bar .actions { margin-left: auto; }
  .ide-bar .project { font-size: 11px; }
}

/* IDE grid layout */
.ide-grid {
  display: grid;
  grid-template-columns: 360px 1fr 320px;
  grid-template-rows: 1fr auto;
  min-height: 600px;
  max-height: 720px;
}
@media (max-width: 1100px) {
  .ide-grid { grid-template-columns: 320px 1fr; grid-template-rows: auto auto auto; max-height: none; }
  .ide-grid .ide-side { grid-column: 1 / -1; grid-row: 3; display: grid; grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .ide-grid { grid-template-columns: 1fr; }
  .ide-grid .ide-side { grid-column: 1; grid-template-columns: 1fr; }
  .ide-grid { max-height: none; }
}

.ide-chat {
  border-right: 1px solid var(--dark-line);
  display: flex; flex-direction: column;
  min-height: 0;
}
.ide-chat .chat-head {
  padding: 12px 18px; border-bottom: 1px solid var(--dark-line);
  font-size: 11px; color: var(--dark-ink-3); letter-spacing: 0.12em; text-transform: uppercase;
  display: flex; align-items: center; gap: 10px; font-family: var(--sans); font-weight: 600;
}
.ide-chat .chat-head::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--cyan); animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }

.ide-chat .chat-body {
  flex: 1; overflow-y: auto;
  padding: 18px 20px; display: flex; flex-direction: column; gap: 12px;
  font-family: var(--mono); font-size: 12.5px; line-height: 1.55;
}
.msg { display: flex; flex-direction: column; gap: 2px; }
.msg.user { align-items: flex-end; }
.msg.user .b { background: var(--accent); color: #fff; border-bottom-right-radius: 4px; }
.msg.ai .b { background: var(--dark-3); color: var(--dark-ink); border-bottom-left-radius: 4px; }
.msg .b {
  padding: 9px 13px; max-width: 88%;
  border-radius: 14px;
  font-family: var(--sans); font-size: 13.5px; line-height: 1.45;
}
.msg .label { font-size: 10px; color: var(--dark-ink-3); font-family: var(--sans); margin: 0 4px 2px; letter-spacing: 0.06em; text-transform: uppercase; }

.think-block {
  background: var(--dark-3); border-radius: 10px; padding: 14px 16px;
  border-left: 2px solid var(--violet);
}
.think-block .tb-head { font-size: 11px; color: var(--violet); letter-spacing: 0.1em; text-transform: uppercase; font-weight: 600; margin-bottom: 6px; font-family: var(--sans); display: flex; align-items: center; gap: 6px; }
.think-block .tb-head::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--violet); }
.think-block .tb-line { color: var(--dark-ink-2); font-size: 12px; font-family: var(--mono); padding: 2px 0; }
.think-block .tb-line.done { color: var(--dark-ink-3); }
.think-block .tb-line::before { content: "✓ "; color: var(--cyan); font-weight: 600; }
.think-block .tb-line.now::before { content: "◐ "; color: var(--accent); }

.tool-card {
  background: var(--dark-3); border-radius: 10px; padding: 12px 14px;
  border: 1px solid var(--dark-line);
  font-family: var(--sans); font-size: 12.5px;
}
.tool-card .tc-head { font-size: 10.5px; color: var(--cyan); letter-spacing: 0.12em; text-transform: uppercase; font-weight: 600; margin-bottom: 4px; }
.tool-card .tc-title { color: var(--dark-ink); font-weight: 500; font-family: var(--mono); font-size: 12.5px; }
.tool-card .tc-body { font-size: 12px; color: var(--dark-ink-2); margin-top: 4px; }

.chat-input {
  border-top: 1px solid var(--dark-line);
  padding: 12px 16px; display: flex; gap: 10px; align-items: center;
  background: var(--dark);
}
.chat-input .inp {
  flex: 1; background: var(--dark-3); border: 1px solid var(--dark-line); border-radius: 8px;
  padding: 9px 12px; color: var(--dark-ink); font-size: 13px; font-family: var(--sans);
}
.chat-input .inp span.cursor { border-left: 2px solid var(--accent); animation: blink 1.1s infinite; margin-left: 2px; }
@keyframes blink { 50% { opacity: 0; } }
.chat-input button.snd { background: var(--accent); color: #fff; border: 0; padding: 9px 14px; border-radius: 8px; font-size: 12.5px; font-weight: 600; font-family: var(--sans); cursor: default; }

/* 3D viewer area */
.ide-viewer {
  background: radial-gradient(circle at 50% 42%, rgba(255,255,255,0.05) 0%, transparent 55%), linear-gradient(180deg, #0e1117 0%, #090b10 80%);
  display: flex; flex-direction: column; position: relative;
  min-height: 0;
}
.ide-viewer .viewer-tabs {
  display: flex; padding: 0 18px; background: var(--dark);
  border-bottom: 1px solid var(--dark-line);
}
.ide-viewer .viewer-tabs .tab {
  padding: 12px 14px; font-size: 12.5px; color: var(--dark-ink-3);
  border-bottom: 2px solid transparent; font-family: var(--sans); cursor: default;
}
.ide-viewer .viewer-tabs .tab.active { color: var(--dark-ink); border-bottom-color: var(--accent); font-weight: 500; }
.ide-viewer .viewer-stage { flex: 1; display: flex; align-items: center; justify-content: center; padding: 32px; position: relative; min-height: 280px; }
.ide-viewer .viewer-stage svg { max-width: 82%; height: auto; filter: drop-shadow(0 14px 34px rgba(255,90,31,0.22)); }
.ide-viewer .viewer-hud { position: absolute; bottom: 14px; left: 18px; right: 18px; display: flex; justify-content: space-between; align-items: center; font-size: 11px; color: var(--dark-ink-3); font-family: var(--mono); pointer-events: none; }
.ide-viewer .viewer-hud .badges { display: flex; gap: 12px; }
.ide-viewer .viewer-hud .b { padding: 3px 8px; border: 1px solid rgba(255,255,255,0.12); border-radius: 5px; background: rgba(0,0,0,0.45); }
.ide-viewer .viewer-hud .b strong { color: var(--dark-ink); font-weight: 500; margin-right: 3px; }

/* Right panel: specs + compat + BOM */
.ide-side {
  border-left: 1px solid var(--dark-line);
  display: flex; flex-direction: column;
  overflow-y: auto;
  background: var(--dark-2);
  min-height: 0;
}
@media (max-width: 1100px) {
  .ide-side { border-left: 0; border-top: 1px solid var(--dark-line); }
}
.panel-card {
  padding: 16px 18px;
  border-bottom: 1px solid var(--dark-line);
  font-family: var(--sans);
}
.panel-card:last-child { border-bottom: 0; }
.panel-card .pc-head { font-size: 10.5px; color: var(--dark-ink-3); letter-spacing: 0.12em; text-transform: uppercase; font-weight: 600; margin-bottom: 10px; display: flex; justify-content: space-between; align-items: center; }
.panel-card .pc-head .pill { padding: 2px 7px; border-radius: 999px; background: rgba(15,169,120,0.14); color: var(--cyan); font-size: 10px; letter-spacing: 0.06em; font-weight: 600; }
.panel-card .pc-head .pill.warn { background: rgba(240,165,26,0.16); color: #f0a51a; }
.panel-card .pc-head .pill.fail { background: rgba(224,74,60,0.16); color: var(--red); }

.panel-card .row-spec {
  display: flex; justify-content: space-between; gap: 10px;
  padding: 4px 0; font-family: var(--mono); font-size: 12.5px;
}
.panel-card .row-spec .k { color: var(--dark-ink-3); }
.panel-card .row-spec .v { color: var(--dark-ink); font-weight: 500; }
.panel-card .row-spec .v.big { color: var(--accent-2); font-weight: 600; }

.panel-card .row-check {
  display: flex; align-items: center; gap: 9px;
  padding: 4px 0; font-family: var(--mono); font-size: 12px; color: var(--dark-ink-2);
}
.panel-card .row-check .dot-sm {
  width: 12px; height: 12px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  color: #fff; font-size: 8px; flex-shrink: 0; font-family: var(--sans);
}
.panel-card .row-check .dot-sm.ok { background: var(--cyan); }
.panel-card .row-check .dot-sm.warn { background: #f0a51a; }
.panel-card .row-check .dot-sm.fail { background: var(--red); }

.bom-row {
  display: grid; grid-template-columns: 1fr auto;
  gap: 8px; padding: 6px 0;
  font-family: var(--mono); font-size: 11.5px;
  border-bottom: 1px dashed var(--dark-line);
}
.bom-row:last-child { border-bottom: 0; }
.bom-row .part { color: var(--dark-ink-2); }
.bom-row .price { color: var(--dark-ink); font-weight: 500; text-align: right; }
.bom-row.total { padding-top: 8px; margin-top: 4px; border-top: 1px solid var(--dark-line); border-bottom: 0; }
.bom-row.total .part { color: var(--dark-ink); font-family: var(--sans); font-weight: 600; }
.bom-row.total .price { color: var(--accent-2); font-weight: 600; }

/* Motion reduce -------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0s !important; transition-duration: 0s !important; }
  html { scroll-behavior: auto; }
}