/* PiHub manual web — Swiss International × IBM style, no external deps.
 * 8px grid, #005fb8 primary, strict alignment, functional hierarchy. */

:root {
  --primary: #005fb8;
  --primary-hover: #004a94;
  --ink: #161616;
  --paper: #ffffff;
  --subtle: #f4f4f4;
  --line: #e0e0e0;
  --muted: #6f6f6f;
  --panel: #ffffff;
  --panel-side: #f4f4f4;
  --demo-msg-user: #e8f0fa;
  --demo-msg-agent: #f4f4f4;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
  --font-sans: "IBM Plex Sans", "HarmonyOS Sans SC", -apple-system,
    "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", "Cascadia Mono",
    Menlo, Consolas, monospace;
}

/* Dark palette (auto-follows the system; manual override via data-theme). */
@media (prefers-color-scheme: dark) {
  :root[data-theme='auto'] {
    --ink: #f4f4f4;
    --paper: #161616;
    --subtle: #1f1f1f;
    --line: #333333;
    --muted: #a8a8a8;
    --panel: #161616;
    --panel-side: #1f1f1f;
    --demo-msg-user: #0d2f52;
    --demo-msg-agent: #1f1f1f;
  }
}

:root[data-theme='dark'] {
  --ink: #f4f4f4;
  --paper: #161616;
  --subtle: #1f1f1f;
  --line: #333333;
  --muted: #a8a8a8;
  --panel: #161616;
  --panel-side: #1f1f1f;
  --demo-msg-user: #0d2f52;
  --demo-msg-agent: #1f1f1f;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.mono {
  font-family: var(--font-mono);
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 var(--space-3);
}

/* ---- header ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--ink);
  font-weight: 600;
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--primary);
  color: #ffffff;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 18px;
}

.nav-links {
  display: flex;
  gap: var(--space-3);
}

.nav-links a {
  color: var(--ink);
  font-size: 14px;
}

.nav-links a:hover {
  color: var(--primary);
  text-decoration: none;
}

/* ---- hero ---- */
.hero {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  padding: var(--space-6) 0 var(--space-5);
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(color-mix(in srgb, var(--line) 55%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--line) 55%, transparent) 1px, transparent 1px);
  background-size: 32px 32px;
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, #000 30%, transparent 75%);
}

.hero-inner {
  position: relative;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.hero-mark {
  font-family: var(--font-mono);
  font-size: 72px;
  font-weight: 600;
  line-height: 1;
  color: var(--primary);
  text-shadow: 0 0 48px color-mix(in srgb, var(--primary) 35%, transparent);
}

.hero-title {
  font-size: 48px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero-slogan {
  font-size: 18px;
  color: var(--muted);
}

.hero-sub {
  max-width: 640px;
  color: var(--muted);
  font-size: 15px;
}

.hero-cta {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 600;
  border: 2px solid var(--primary);
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.15s ease;
}

.btn:hover {
  text-decoration: none;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
}

.btn-outline:hover {
  background: var(--subtle);
}

.hero-endpoint {
  margin-top: var(--space-3);
  padding: var(--space-1) var(--space-3);
  border: 1px dashed var(--line);
  color: var(--primary);
  font-size: 14px;
}

/* ---- sections ---- */
.section {
  padding: var(--space-6) 0;
}

.section-alt {
  background: var(--subtle);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-1);
  border-bottom: 3px solid var(--primary);
  display: inline-block;
}

.section-lead {
  color: var(--muted);
  margin-bottom: var(--space-2);
}

/* ---- features ---- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-3);
}

.feature-card {
  border: 1px solid var(--line);
  border-top: 3px solid var(--primary);
  padding: var(--space-3);
  background: var(--paper);
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.feature-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.feature-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.feature-card p {
  font-size: 14px;
  color: var(--muted);
}

.feature-card code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--subtle);
  padding: 1px 4px;
}

/* ---- install ---- */
.code-block {
  background: var(--ink);
  color: var(--paper);
  padding: var(--space-3);
  font-size: 13px;
  line-height: 1.7;
  overflow-x: auto;
  margin: var(--space-2) 0 var(--space-3);
}

.install-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-3);
}

.install-grid h3 {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: var(--space-1);
}

/* ---- manual ---- */
.manual-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.manual-item {
  border: 1px solid var(--line);
  border-left: 3px solid var(--primary);
  background: var(--paper);
}

.manual-item summary {
  padding: var(--space-2) var(--space-3);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.manual-item summary::after {
  content: '+';
  font-family: var(--font-mono);
  color: var(--primary);
  font-weight: 600;
}

.manual-item[open] summary::after {
  content: '−';
}

.manual-body {
  padding: 0 var(--space-3) var(--space-2);
  font-size: 14px;
  color: var(--muted);
  max-width: 720px;
}

.manual-body p {
  margin-bottom: var(--space-1);
}

.manual-body code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--subtle);
  padding: 1px 4px;
}

/* ---- shortcuts ---- */
.shortcut-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
}

.shortcut-table th,
.shortcut-table td {
  text-align: left;
  padding: var(--space-2) var(--space-2);
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.shortcut-table th {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  border-bottom: 2px solid var(--ink);
}

.shortcut-table td:first-child {
  white-space: nowrap;
  font-weight: 600;
  color: var(--primary);
}

/* ---- security ---- */
.security-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-3);
}

.security-item {
  border-top: 1px solid var(--line);
  padding-top: var(--space-2);
}

.security-index {
  color: var(--primary);
  font-size: 13px;
}

.security-item h3 {
  font-size: 16px;
  font-weight: 600;
  margin: var(--space-1) 0;
}

.security-item p {
  font-size: 14px;
  color: var(--muted);
}

.security-item code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--subtle);
  padding: 1px 4px;
}

/* ---- footer ---- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--subtle);
  padding: var(--space-5) 0;
}

.footer-inner {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
}

.footer-title {
  font-weight: 600;
}

.footer-note {
  font-size: 13px;
  color: var(--muted);
  max-width: 720px;
}

.footer-note code {
  font-family: var(--font-mono);
  font-size: 12px;
}

/* ---- responsive ---- */
@media (max-width: 720px) {
  .nav-links {
    gap: var(--space-2);
  }
  .nav-links a {
    font-size: 13px;
  }
  .hero-title {
    font-size: 36px;
  }
  .hero-mark {
    font-size: 56px;
  }
}

/* ---- site controls (lang / theme) ---- */
.site-controls {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.chip {
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: all 0.15s ease;
}

.chip:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.chip[data-active='true'] {
  background: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
}

/* ---- demo shell (browser-window chrome + panel) ---- */
.demo-shell {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.1);
  margin-top: var(--space-3);
}

.demo-chrome {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2);
  border-bottom: 1px solid var(--line);
  background: var(--subtle);
}

.demo-traffic {
  display: inline-flex;
  gap: 6px;
}

.demo-traffic i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.demo-traffic i:nth-child(1) { background: #ff5f57; }
.demo-traffic i:nth-child(2) { background: #febc2e; }
.demo-traffic i:nth-child(3) { background: #28c840; }

.demo-address {
  flex: 1;
  font-size: 12px;
  color: var(--muted);
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 3px var(--space-2);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.demo-chrome-title {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.demo-window {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
}

.demo-sidebar {
  background: var(--panel-side);
  border-right: 1px solid var(--line);
  padding-top: var(--space-1);
  display: flex;
  flex-direction: column;
  min-height: 380px;
}

.demo-sidebar-head {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2) var(--space-2);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}

.demo-brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  background: var(--primary);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 13px;
}

.demo-nav {
  display: flex;
  flex-direction: column;
  padding-bottom: var(--space-1);
  border-bottom: 1px solid var(--line);
}

.demo-nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 5px 12px;
  font-size: 12px;
  color: var(--muted);
}

.demo-nav-item b {
  color: var(--primary);
  font-weight: 600;
  min-width: 16px;
  text-align: center;
}

.demo-group-label {
  padding: var(--space-2) 12px 4px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.demo-session {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 6px 10px;
  font-size: 12px;
  color: var(--muted);
}

.demo-session-active {
  background: var(--subtle);
  border-left: 3px solid var(--primary);
  color: var(--ink);
}

.demo-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  background: #198038;
}

.demo-dot[data-status='running'] {
  background: #0072c3;
  animation: demo-pulse 1.4s ease-in-out infinite;
}

.demo-dot[data-status='interrupted'] {
  background: #da1e28;
}

.demo-session-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.demo-sidebar-foot {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2);
  border-top: 1px solid var(--line);
  font-size: 11px;
  color: var(--muted);
}

.demo-user-id {
  margin-left: auto;
  color: var(--primary);
  font-size: 11px;
}

.demo-main {
  display: flex;
  flex-direction: column;
  min-height: 320px;
}

.demo-messages {
  flex: 1 1 auto;
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  overflow: hidden;
}

.demo-msg {
  max-width: 88%;
  padding: var(--space-2);
  font-size: 13px;
  line-height: 1.6;
}

.demo-msg-user {
  align-self: flex-end;
  background: var(--demo-msg-user);
  color: var(--ink);
}

.demo-msg-agent {
  align-self: flex-start;
  background: var(--demo-msg-agent);
  color: var(--ink);
}

.demo-thinking {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--primary);
  font-size: 12px;
}

.demo-thinking-icon {
  animation: demo-pulse 1.2s ease-in-out infinite;
  font-weight: 600;
}

.demo-thinking-label span {
  display: inline-block;
  animation: demo-char-fade 1.8s ease-in-out infinite;
  opacity: 0.35;
}

.demo-typewriter {
  border-right: 2px solid var(--primary);
  animation: demo-caret 0.8s step-start infinite;
}

/* ---- demo tool call card ---- */
.demo-tool {
  align-self: flex-start;
  max-width: 88%;
  border: 1px solid var(--line);
  border-left: 3px solid var(--primary);
  background: var(--panel);
  font-size: 12px;
}

.demo-tool-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px var(--space-2);
  border-bottom: 1px solid var(--line);
  background: var(--subtle);
  font-size: 11px;
}

.demo-tool-name {
  color: var(--primary);
  font-weight: 600;
}

.demo-tool-status {
  color: #198038;
}

.demo-tool-body {
  padding: var(--space-2);
  color: var(--muted);
  line-height: 1.7;
}

.demo-tool-cmd {
  color: var(--ink);
  margin-bottom: 4px;
}

.demo-tool-cmd::before {
  content: '$ ';
  color: var(--primary);
  font-weight: 600;
}

/* ---- demo summary (elapsed countdown) ---- */
.demo-summary {
  padding: 0 var(--space-3) var(--space-2);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.demo-collapse {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  align-self: flex-start;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  cursor: pointer;
  padding: 2px 0;
}

.demo-collapse:hover {
  color: var(--primary);
}

.demo-clock {
  color: var(--primary);
}

#demo-timer {
  color: var(--ink);
  font-weight: 600;
}

.demo-chevron {
  font-weight: 700;
  transition: transform 0.15s ease;
}

.demo-summary[data-collapsed='false'] .demo-chevron {
  transform: rotate(90deg);
}

.demo-divider {
  border-top: 1px solid var(--line);
}

.demo-settle {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.4em;
}

.demo-composer {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  border-top: 1px solid var(--line);
}

.demo-composer-row {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 11px;
}

.demo-select {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  padding: 2px 8px;
  cursor: default;
}

.demo-hint {
  margin-left: auto;
  color: var(--muted);
}

.demo-composer-input {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  border: 1px solid var(--line);
  border-bottom: 2px solid var(--primary);
  background: var(--panel);
  padding: var(--space-1) var(--space-2);
  font-size: 12px;
  color: var(--muted);
}

.demo-send {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  background: var(--primary);
  color: #ffffff;
  font-weight: 600;
  font-size: 14px;
  animation: demo-send-pulse 1.6s ease-in-out infinite;
}

@keyframes demo-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

@keyframes demo-char-fade {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

@keyframes demo-caret {
  50% { border-color: transparent; }
}

@keyframes demo-send-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0, 95, 184, 0.4); }
  50% { box-shadow: 0 0 0 6px rgba(0, 95, 184, 0); }
}

/* ---- install steps ---- */
.install-steps {
  list-style: none;
  margin: 0 0 var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.install-step {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
}

.install-step-no {
  font-size: 20px;
  font-weight: 600;
  color: var(--primary);
  min-width: 48px;
}

.install-step h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.install-step p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: var(--space-1);
}

.install-step .code-block {
  margin: 0;
}

/* ---- faq ---- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.faq-item {
  border: 1px solid var(--line);
  background: var(--panel);
}

.faq-item summary {
  padding: var(--space-2) var(--space-3);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.faq-item summary::after {
  content: '+';
  font-family: var(--font-mono);
  color: var(--primary);
  font-weight: 600;
}

.faq-item[open] summary::after {
  content: '−';
}

.faq-body {
  padding: 0 var(--space-3) var(--space-2);
  font-size: 14px;
  color: var(--muted);
  max-width: 720px;
}

/* ---- responsive ---- */
@media (max-width: 760px) {
  .demo-window {
    grid-template-columns: 1fr;
  }
  .demo-sidebar {
    display: none;
  }
  .demo-chrome-title {
    display: none;
  }
  .site-controls {
    gap: var(--space-1);
  }
  .nav-links {
    display: none;
  }
}