/* ============================================================
   Hermes DevOps Toolkit — Stylesheet
   Inspired by the authentic design language of hermes-agent.nousresearch.com
   - Signature electric blue (#0000f2) hero stage
   - Ultra-condensed editorial headlines & monospace technical labels
   - Sharp brutalist-precision cards & zero-radius paper buttons
   - Dotted technical border accents & :OS: tab pills
   - Light/Dark adaptability via prefers-color-scheme
   - 100% vanilla CSS, no frameworks, no CDN dependencies
   ============================================================ */

/* ------------------------------------------------------------
   Typography: Rules Gothic Condensed
   Family name: Rules Gothic Condensed
   PostScript name: RulesGothicCnd-Regular
   ------------------------------------------------------------ */
@font-face {
  font-family: "Rules Gothic Condensed";
  font-style: normal;
  font-weight: 300 700;
  src: local("Rules Gothic Condensed"),
       local("RulesGothicCnd-Regular"),
       local("RulesGothicCnd"),
       url("../assets/fonts/RulesGothicCnd-Regular.woff2") format("woff2"),
       url("../assets/fonts/RulesGothicCnd-Light.woff2") format("woff2");
  font-display: swap;
}

@font-face {
  font-family: "RulesGothicCnd-Regular";
  font-style: normal;
  font-weight: 400;
  src: local("RulesGothicCnd-Regular"),
       local("Rules Gothic Condensed"),
       url("../assets/fonts/RulesGothicCnd-Regular.woff2") format("woff2");
  font-display: swap;
}

/* ------------------------------------------------------------
   Typography: Inter (for body and card content)
   ------------------------------------------------------------ */
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 400;
  src: local("Inter"),
       local("Inter Regular"),
       local("Inter-Regular"),
       url("../assets/fonts/Inter-Regular.woff2") format("woff2");
  font-display: swap;
}

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 600 700;
  src: local("Inter SemiBold"),
       local("Inter-SemiBold"),
       local("Inter Bold"),
       url("../assets/fonts/Inter-SemiBold.woff2") format("woff2");
  font-display: swap;
}

/* ------------------------------------------------------------
   1. Design tokens
   ------------------------------------------------------------ */
:root {
  /* Signature Hermes colors */
  --hermes-primary: #0000f2;
  --hermes-primary-deep: #0000ba;
  --hermes-primary-light: #7b83ff;
  --hermes-white: #ffffff;
  --hermes-paper-light: #f4f4ee;

  /* Hero stage is ALWAYS electric blue (#0000f2), the visual anchor of Hermes Agent */
  --hero-bg: #0000f2;
  --hero-fg: #ffffff;
  --hero-fg-muted: rgba(255, 255, 255, 0.82);
  --hero-fg-faint: rgba(255, 255, 255, 0.6);
  --hero-border: rgba(255, 255, 255, 0.22);
  --hero-terminal-bg: rgba(6, 6, 26, 0.92);

  /* Content area — dark mode default */
  color-scheme: dark;
  --bg: #06060f;
  --bg-alt: #0b0c1a;
  --surface: #0f1022;
  --surface-2: #15162e;
  --border: #222344;
  --border-strong: #323562;
  --border-dotted: #0000f2;

  --text: #f0f2fa;
  --text-muted: #9ba0be;
  --text-faint: #5a5f82;

  --accent: #0000f2;
  --accent-fg: #7e87ff;
  --accent-soft: rgba(0, 0, 242, 0.14);

  --btn-paper-bg: #ffffff;
  --btn-paper-fg: #0000f2;
  --ok: #2fd873;

  /* Typography */
  --font-ui: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: "Rules Gothic Condensed", "RulesGothicCnd-Regular", "RulesGothicCnd", "Arial Narrow", Impact, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Consolas", "Liberation Mono", Menlo, monospace;

  --nav-h: 68px;
  --shadow-lift: 0 4px 14px rgba(0, 0, 0, 0.4);
}

@media (prefers-color-scheme: light) {
  :root {
    color-scheme: light;

    /* Content area — signature Hermes paper tone */
    --bg: #f4f4ee;
    --bg-alt: #eaeae0;
    --surface: #ffffff;
    --surface-2: #eaeae2;
    --border: #d4d4ca;
    --border-strong: #b8b8aa;
    --border-dotted: #0000f2;

    --text: #0a0a14;
    --text-muted: #4d5064;
    --text-faint: #81859c;

    --accent: #0000f2;
    --accent-fg: #0000c4;
    --accent-soft: rgba(0, 0, 242, 0.08);

    --btn-paper-bg: #ffffff;
    --btn-paper-fg: #0000f2;
    --ok: #0d8a43;

    --shadow-lift: 0 4px 14px rgba(0, 0, 0, 0.08);
  }
}

/* ------------------------------------------------------------
   2. Reset & base
   ------------------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
  background: var(--hero-bg);
  overflow-x: clip;
}

body {
  margin: 0;
  font-family: var(--font-ui);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 0.5em;
  font-weight: 500;
}

p {
  margin: 0 0 1em;
}

a {
  color: inherit;
  text-decoration-color: color-mix(in srgb, var(--accent) 60%, transparent);
  text-underline-offset: 3px;
}

a:hover {
  color: var(--accent-fg);
  text-decoration-color: currentColor;
}

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 0.1em 0.35em;
}

img,
svg {
  max-width: 100%;
  display: block;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

button {
  font: inherit;
}

:focus-visible {
  outline: 2px solid var(--accent-fg);
  outline-offset: 3px;
}

::selection {
  background: #0000f2;
  color: #ffffff;
}

/* ------------------------------------------------------------
   3. Layout primitives
   ------------------------------------------------------------ */
.container {
  width: min(1200px, 100% - 2rem);
  margin-inline: auto;
}

.container-narrow {
  width: min(800px, 100% - 2rem);
}

.section {
  padding-block: clamp(4rem, 8vw, 7rem);
}

.section-alt {
  background: var(--bg-alt);
  border-block: 1px solid var(--border);
}

.section-head {
  max-width: 720px;
  margin-bottom: clamp(2.5rem, 5vw, 3.8rem);
}

.kicker {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent-fg);
  margin: 0 0 0.75rem;
  font-weight: 600;
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4.4vw, 3.4rem);
  letter-spacing: -0.02em;
  font-weight: 400;
  line-height: 1.05;
}

.section-head > p {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin: 0;
}

.mono-label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-fg);
  font-weight: 600;
}

/* ------------------------------------------------------------
   4. Header / nav (situated on electric blue hero)
   ------------------------------------------------------------ */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 100;
  background: #ffffff;
  color: #0000f2;
  padding: 0.6rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
}

.skip-link:focus {
  left: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--hero-bg);
  border-bottom: 1px solid var(--hero-border);
  color: #ffffff;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  height: var(--nav-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: #ffffff;
}

.brand-mark {
  flex-shrink: 0;
}

.brand-mark .mark-bg {
  fill: #ffffff;
}

.brand-mark .mark-pulse {
  stroke: #0000f2;
}

.brand-name {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

.site-nav a {
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--hero-fg-muted);
  transition: color 0.15s ease, opacity 0.15s ease;
  padding: 0.3rem 0.2rem;
}

.site-nav a:hover {
  color: #ffffff;
}

.site-nav .nav-cta {
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: #ffffff;
  padding: 0.45rem 1rem;
  font-weight: 600;
}

.site-nav .nav-cta:hover {
  background: #ffffff;
  color: #0000f2;
  border-color: #ffffff;
}

/* Mobile nav */
.nav-toggle {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}

.nav-burger span {
  width: 22px;
  height: 2px;
  background: #ffffff;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle:focus-visible + .nav-burger {
  outline: 2px solid #ffffff;
  outline-offset: 2px;
}

.nav-toggle:checked + .nav-burger span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle:checked + .nav-burger span:nth-child(2) {
  opacity: 0;
}

.nav-toggle:checked + .nav-burger span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 900px) {
  .nav-burger {
    display: flex;
  }

  .site-nav {
    position: fixed;
    inset: var(--nav-h) 0 auto;
    background: #0000ba;
    border-bottom: 2px solid #ffffff;
    transform: translateY(-130%);
    visibility: hidden;
    transition: transform 0.25s ease, visibility 0.25s;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    max-height: calc(100dvh - var(--nav-h));
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .nav-toggle:checked ~ .site-nav {
    transform: translateY(0);
    visibility: visible;
  }

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 1rem 1.5rem 1.5rem;
  }

  .site-nav li + li {
    border-top: 1px solid rgba(255, 255, 255, 0.15);
  }

  .site-nav a {
    display: block;
    padding: 0.85rem 0;
    font-size: 0.95rem;
  }

  .site-nav .nav-cta {
    border: 0;
    padding: 0.85rem 0;
    background: transparent;
  }
}

/* ------------------------------------------------------------
   5. Buttons & technical chips (Hermes brutalist precision)
   ------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.8rem 1.4rem;
  text-decoration: none;
  border-radius: 0;
  transition: background 0.15s ease, color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
  cursor: pointer;
}

.btn-primary {
  background: var(--btn-paper-bg, #ffffff);
  color: var(--btn-paper-fg, #0000f2);
  border: 1px solid #ffffff;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}

.btn-primary:hover {
  background: #f0f0f5;
  color: #0000ba;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.14);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.24);
  color: #ffffff;
  border-color: #ffffff;
  transform: translateY(-2px);
}

.chip {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.22rem 0.55rem;
  border-radius: 2px;
  white-space: nowrap;
}

.chip-inverse {
  background: #ffffff;
  color: #0000f2;
}

.chip-ghost {
  background: rgba(255, 255, 255, 0.16);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.chip-planned {
  background: var(--accent-soft);
  color: var(--accent-fg);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}

/* ------------------------------------------------------------
   6. Hero section (Electric Blue Stage)
   ------------------------------------------------------------ */
.hero {
  background: var(--hero-bg);
  color: var(--hero-fg);
  padding-block: clamp(3.5rem, 8vw, 6.5rem) clamp(3rem, 7vw, 5.5rem);
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 85% 15%, rgba(255, 255, 255, 0.12), transparent 50%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(2.5rem, 5vw, 4.5rem);
  align-items: center;
  position: relative;
  z-index: 1;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.2rem;
}

/* Editorial condensed headline */
.hero-title {
  display: flex;
  flex-direction: column;
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 7vw, 5.4rem);
  line-height: 0.94;
  letter-spacing: -0.025em;
  font-weight: 400;
  text-transform: none;
  margin: 0 0 1.4rem;
  word-break: break-word;
}

.hero-title span {
  display: block;
}

.hero-sub {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  line-height: 1.5;
  color: var(--hero-fg-muted);
  max-width: 33em;
  margin-bottom: 2rem;
}

.hero-sub a {
  color: #ffffff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.hero-sub a:hover {
  color: #ffffff;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-bottom: 1.5rem;
}

.hero-note {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--hero-fg-faint);
  margin: 0;
}

.hero-note strong {
  color: #ffffff;
}

/* Terminal card on hero */
.terminal {
  background: var(--hero-terminal-bg);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.45);
  overflow: hidden;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex: none;
}

.dot-r { background: #ff5f57; }
.dot-y { background: #febc2e; }
.dot-g { background: #28c840; }

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.6);
  margin-left: 0.4rem;
  white-space: nowrap;
}

.terminal-bar .chip {
  margin-left: auto;
}

.terminal-body {
  padding: 1.2rem;
}

.codeblock {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.65;
  color: #f5f6fa;
  white-space: pre-wrap;
  word-break: break-word;
}

.t-comment {
  color: #7b80a0;
}

.t-prompt {
  color: #5c68ff;
  font-weight: 700;
}

.t-user {
  color: #ffffff;
}

.terminal-caption {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: #7b80a0;
  margin: 0.9rem 0 0;
}

/* Copy button */
.copy-btn {
  display: none;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: transparent;
  color: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 2px;
  padding: 0.25rem 0.6rem;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.copy-btn:hover {
  color: #ffffff;
  border-color: #ffffff;
}

.js .copy-btn {
  display: inline-flex;
}

/* Affiliation rule bar */
.affiliation-note {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  border-top: 1px dotted var(--border-dotted);
  padding-block: 1rem;
  margin: 0;
}

/* ------------------------------------------------------------
   7. Skills section
   ------------------------------------------------------------ */
.skill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(320px, 100%), 1fr));
  gap: 1.6rem;
}

.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: 2px;
  padding: clamp(1.6rem, 3.5vw, 2.4rem);
  box-shadow: var(--shadow-lift);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.skill-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}

.skill-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1.1rem;
}

.skill-card h3 {
  font-family: var(--font-display);
  font-size: 1.65rem;
  letter-spacing: -0.015em;
  font-weight: 400;
  margin-bottom: 0.5em;
}

.skill-card > p {
  color: var(--text-muted);
  font-size: 0.96rem;
}

.skill-points {
  display: grid;
  gap: 0.6rem;
  margin-top: 1.2rem;
  border-top: 1px dotted var(--border-dotted);
  padding-top: 1rem;
}

.skill-points li {
  position: relative;
  padding-left: 1.4rem;
  font-size: 0.92rem;
  color: var(--text);
}

.skill-points li::before {
  content: "→";
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  color: var(--accent-fg);
  font-weight: 700;
}

/* ------------------------------------------------------------
   8. Principles / feature grid
   ------------------------------------------------------------ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 1.6rem 1.4rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}

.feature-num {
  display: block;
  margin-bottom: 0.7rem;
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  font-weight: 500;
}

.feature-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.94rem;
}

/* ------------------------------------------------------------
   9. How it works (5-step flow)
   ------------------------------------------------------------ */
.steps {
  display: grid;
  gap: 1.5rem;
  max-width: 780px;
}

.step {
  display: flex;
  gap: 1.3rem;
  align-items: flex-start;
  padding-bottom: 1.5rem;
  border-bottom: 1px dotted var(--border-dotted);
}

.step:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.step-num {
  flex: none;
  width: 2.6rem;
  height: 2.6rem;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--accent-fg);
  background: var(--surface);
  border: 1px solid var(--accent);
  border-radius: 2px;
}

.step h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: 0.25em;
}

.step p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ------------------------------------------------------------
   10. Requirements tabs (Hermes :OS: button syntax)
   ------------------------------------------------------------ */
.tab-input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.tab-pills {
  display: inline-flex;
  gap: 0.4rem;
  margin-bottom: 1.2rem;
}

.tab-pill {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.5rem 1rem;
  cursor: pointer;
  border-radius: 2px;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.tab-pill:hover {
  color: var(--text);
  border-color: var(--border-strong);
}

.tab-input:focus-visible ~ .tab-pills label[for="tab-macos"],
.tab-input:focus-visible ~ .tab-pills label[for="tab-linux"],
.tab-input:focus-visible ~ .tab-pills label[for="tab-windows"] {
  outline: 2px solid var(--accent-fg);
  outline-offset: 2px;
}

.tab-input:nth-of-type(1):checked ~ .tab-pills label[for="tab-macos"],
.tab-input:nth-of-type(2):checked ~ .tab-pills label[for="tab-linux"],
.tab-input:nth-of-type(3):checked ~ .tab-pills label[for="tab-windows"] {
  background: #0000f2;
  color: #ffffff;
  border-color: #0000f2;
}

.tab-panels {
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lift);
}

.tab-panels .terminal-bar {
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
}

.tab-panels .terminal-title {
  color: var(--text-faint);
}

.tab-panels .codeblock {
  color: var(--text);
}

.tab-panels .copy-btn {
  color: var(--text-muted);
  border-color: var(--border-strong);
}

.tab-panels .copy-btn:hover {
  color: var(--accent-fg);
  border-color: var(--accent-fg);
}

.tab-panel {
  display: none;
}

.tab-input:nth-of-type(1):checked ~ .tab-panels #panel-macos,
.tab-input:nth-of-type(2):checked ~ .tab-panels #panel-linux,
.tab-input:nth-of-type(3):checked ~ .tab-panels #panel-windows {
  display: block;
}

/* ------------------------------------------------------------
   11. Safety callout
   ------------------------------------------------------------ */
.callout {
  background: var(--surface);
  border: 1px solid var(--accent);
  border-radius: 2px;
  padding: clamp(1.8rem, 4vw, 2.8rem);
  box-shadow: 4px 4px 0 var(--accent);
}

.callout h2 {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.2vw, 2.2rem);
  font-weight: 400;
}

.callout > p {
  color: var(--text-muted);
}

.callout-icon {
  display: inline-grid;
  place-items: center;
  width: 2.2rem;
  height: 2.2rem;
  font-size: 1.1rem;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  border-radius: 2px;
}

.callout-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.4rem;
  margin-top: 1.8rem;
  border-top: 1px dotted var(--border-dotted);
  padding-top: 1.4rem;
}

.callout-grid h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 500;
  margin-bottom: 0.4em;
}

.callout-grid p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ------------------------------------------------------------
   13. FAQ (Dotted accordion lines like Hermes Agent)
   ------------------------------------------------------------ */
.faq {
  display: grid;
  border-bottom: 1px dotted var(--border-dotted);
}

.faq details {
  background: transparent;
  border-top: 1px dotted var(--border-dotted);
  padding: 0.3rem 0;
}

.faq summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 400;
  letter-spacing: -0.01em;
  padding-block: 1rem;
  list-style: none;
  position: relative;
  padding-right: 2.5rem;
  color: var(--accent-fg);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: color-mix(in srgb, var(--accent) 50%, transparent);
}

.faq summary:hover {
  text-decoration-color: currentColor;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "+";
  position: absolute;
  right: 0.2rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.35rem;
  color: var(--accent-fg);
  font-weight: 400;
}

.faq details[open] summary::after {
  content: "−";
}

.faq details p {
  color: var(--text);
  padding-bottom: 1.2rem;
  margin: 0;
  max-width: 700px;
  line-height: 1.65;
}

/* ------------------------------------------------------------
   14. Footer
   ------------------------------------------------------------ */
.site-footer {
  background: var(--bg-alt);
  border-top: 1px dotted var(--border-dotted);
  padding-block: clamp(3.5rem, 6vw, 5rem) 2.5rem;
  overflow: hidden;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2rem;
}

.footer-col h3 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 1rem;
}

.footer-col ul {
  display: grid;
  gap: 0.6rem;
}

.footer-col a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.94rem;
}

.footer-col a:hover {
  color: var(--accent-fg);
}

.footer-legal {
  margin-top: 3rem;
  padding-top: 1.6rem;
  border-top: 1px dotted var(--border-dotted);
}

.footer-legal p {
  color: var(--text-faint);
  font-size: 0.82rem;
  margin-bottom: 0.4rem;
}

.footer-legal .tagline {
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.footer-wordmark {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 8vw, 8.5rem);
  font-weight: 300;
  letter-spacing: -0.03em;
  line-height: 1;
  text-align: center;
  color: transparent;
  -webkit-text-stroke: 1px var(--border-strong);
  margin: 3rem 0 0;
  user-select: none;
  white-space: nowrap;
  max-width: 100%;
  overflow: hidden;
}

/* ------------------------------------------------------------
   15. Breakpoints & reduced motion
   ------------------------------------------------------------ */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .callout-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .section {
    padding-block: clamp(3rem, 7vw, 4.5rem);
  }

  .feature-grid,
  .callout-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .skill-grid {
    grid-template-columns: 1fr;
  }

  .cta-row {
    flex-direction: column;
    width: 100%;
  }

  .cta-row .btn {
    width: 100%;
    justify-content: center;
    min-height: 48px;
  }

  .tab-pills {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    width: 100%;
    gap: 0.25rem;
  }

  .tab-pill {
    text-align: center;
    padding: 0.55rem 0.2rem;
    font-size: clamp(0.72rem, 3vw, 0.82rem);
  }

  .step {
    gap: 1rem;
  }

  .step-num {
    width: 2.2rem;
    height: 2.2rem;
    font-size: 0.85rem;
  }
}

@media (max-width: 420px) {
  .brand-name {
    font-size: 0.78rem;
  }

  .eyebrow {
    flex-wrap: wrap;
    gap: 0.4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .btn:hover,
  .skill-card:hover,
  .feature-card:hover {
    transform: none;
  }
}

@media print {
  .site-header,
  .cta-row,
  .copy-btn,
  .tab-pills {
    display: none;
  }
}