/* ============================================================
   Claw Companion — main.css
   单文件设计系统；无构建；深色暖调 + 铜橙 accent
   ============================================================ */

:root {
  /* colors */
  --bg-0: #0a0a0b;
  --bg-1: #131213;
  --bg-2: #1c1a1b;
  --bg-3: #252324;
  --fg-0: #f4f1ec;
  --fg-1: #a9a39a;
  --fg-2: #726d67;
  --fg-3: #4a4642;
  --accent: #e57a3e;
  --accent-2: #f4a56f;
  --accent-dim: #643418;
  --border: #2a2725;
  --border-2: #3a3633;
  --ok: #7ab067;
  --ok-2: #a7cc95;
  --warn: #d89a4a;

  /* layout */
  --maxw: 1160px;
  --r-sm: 6px;
  --r: 10px;
  --r-lg: 16px;
  --r-xl: 24px;

  /* type */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", system-ui, sans-serif;
  --font-mono: "SF Mono", ui-monospace, Menlo, Consolas, "JetBrains Mono", monospace;

  /* motion */
  --tr: 180ms cubic-bezier(.2,.8,.2,1);
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg-0);
  color: var(--fg-0);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; transition: color var(--tr); }
a:hover { color: var(--accent-2); }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
::selection { background: var(--accent-dim); color: var(--fg-0); }

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}
@media (min-width: 768px) {
  .container { padding: 0 32px; }
}

/* ---- Typographic helpers ---- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 18px;
}
.section-title {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.12;
  letter-spacing: -.02em;
  margin: 0 0 20px;
  font-weight: 700;
}
.lede {
  font-size: 18px;
  color: var(--fg-1);
  max-width: 640px;
  margin: 0 0 32px;
}
.lede.center { margin-left: auto; margin-right: auto; text-align: center; }
.accent { color: var(--accent); }
.muted { color: var(--fg-2); }

/* ============================================================
   Brand mark — 一个小色块，conic-gradient 模拟爪子光泽
   ============================================================ */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--fg-0);
}
.brand-mark {
  width: 22px;
  height: 22px;
  border-radius: 7px;
  background:
    conic-gradient(from 135deg at 50% 50%,
      var(--accent) 0deg,
      #7a3a16 110deg,
      var(--accent-2) 200deg,
      var(--accent) 360deg);
  box-shadow:
    inset 0 0 0 1px rgba(255,255,255,.06),
    0 0 24px -6px var(--accent-dim);
  position: relative;
}
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 3px;
  background: var(--bg-0);
  clip-path: polygon(0 0, 60% 0, 100% 40%, 100% 100%, 40% 100%, 0 60%);
  opacity: .85;
}
.brand-name { font-size: 15px; }

/* ============================================================
   Nav
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10,10,11,.74);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 24px;
}
.nav-links {
  display: flex;
  gap: 28px;
  font-size: 14px;
  color: var(--fg-1);
}
.nav-links a:hover { color: var(--fg-0); }
@media (max-width: 640px) {
  .nav-links { display: none; }
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  transition: background var(--tr), border-color var(--tr), color var(--tr), transform var(--tr), box-shadow var(--tr);
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #1a0b02;
  box-shadow: 0 10px 28px -12px var(--accent-dim);
}
.btn-primary:hover {
  background: var(--accent-2);
  color: #1a0b02;
  transform: translateY(-1px);
  box-shadow: 0 14px 32px -12px var(--accent-dim);
}
.btn-ghost {
  border-color: var(--border-2);
  color: var(--fg-0);
}
.btn-ghost:hover { background: var(--bg-2); }
.btn-link {
  color: var(--fg-1);
  padding: 10px 4px;
}
.btn-link:hover { color: var(--fg-0); }
.btn-lg { padding: 15px 30px; font-size: 15px; }

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  padding: 72px 0 100px;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -10% -5% 0 -5%;
  background:
    radial-gradient(ellipse 45% 55% at 85% 25%, rgba(229,122,62,.22), transparent 70%),
    radial-gradient(ellipse 70% 70% at 10% 110%, rgba(229,122,62,.07), transparent 80%);
  pointer-events: none;
  z-index: 0;
}
.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 56px;
  align-items: center;
}
@media (min-width: 960px) {
  .hero-inner { grid-template-columns: 1.05fr .95fr; gap: 72px; }
  .hero { padding: 96px 0 140px; }
}
.hero-copy h1 {
  font-size: clamp(44px, 6.4vw, 76px);
  line-height: 1.02;
  letter-spacing: -.035em;
  margin: 12px 0 24px;
  font-weight: 700;
}
.hero-copy .lede { margin-bottom: 36px; }
.hero-cta {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}

/* ---- Demo frame ---- */
.hero-demo { position: relative; }
.demo-frame {
  background: linear-gradient(180deg, var(--bg-1), var(--bg-2));
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow:
    0 40px 80px -40px rgba(0,0,0,.7),
    0 0 0 1px rgba(255,255,255,.02) inset;
}
.demo-chrome {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
}
.demo-chrome span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg-3);
}
.demo-chrome span:nth-child(1) { background: #c94f3f; }
.demo-chrome span:nth-child(2) { background: #d4a850; }
.demo-chrome span:nth-child(3) { background: #7ab067; }
.demo-title {
  margin: 0 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-2);
}
.demo-body {
  padding: 22px 24px;
  min-height: 420px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--fg-1);
  line-height: 1.75;
}
.demo-body .user {
  color: var(--fg-0);
  padding: 4px 0 12px;
}
.demo-body .user::before { content: "› "; color: var(--accent); }
.demo-body .step {
  display: block;
  padding: 2px 0 2px 22px;
  position: relative;
}
.demo-body .step::before {
  content: "○";
  position: absolute;
  left: 0;
  color: var(--fg-3);
}
.demo-body .step.ok::before { content: "✓"; color: var(--ok); }
.demo-body .step.run::before {
  content: "◐";
  color: var(--accent);
  animation: spin 1.1s linear infinite;
}
.demo-body .plan {
  margin: 10px 0 10px;
  padding: 12px 14px;
  background: var(--bg-0);
  border-radius: var(--r-sm);
  border-left: 2px solid var(--accent);
  color: var(--fg-0);
  font-size: 12.5px;
  white-space: pre;
  overflow-x: auto;
}
.demo-body .done {
  color: var(--ok-2);
  font-weight: 500;
  padding: 10px 0 2px;
}
.demo-cursor {
  display: inline-block;
  width: 7px;
  height: 1em;
  background: var(--accent);
  vertical-align: -2px;
  margin-left: 2px;
  animation: blink 1s step-end infinite;
}
.demo-caption {
  margin: 14px 0 0;
  font-size: 12px;
  color: var(--fg-3);
  text-align: center;
  font-family: var(--font-mono);
}
@keyframes blink { 50% { opacity: 0; } }
@keyframes spin  { to { transform: rotate(360deg); } }

/* ============================================================
   Section base
   ============================================================ */
.section {
  padding: 80px 0;
  border-top: 1px solid var(--border);
  position: relative;
}
@media (min-width: 960px) {
  .section { padding: 120px 0; }
}

/* ============================================================
   Pain section
   ============================================================ */
.pain-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  margin-top: 32px;
}
.pain-card {
  padding: 28px;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  transition: border-color var(--tr), transform var(--tr), background var(--tr);
}
.pain-card:hover {
  border-color: var(--border-2);
  transform: translateY(-2px);
  background: var(--bg-2);
}
.pain-n {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  margin: 0 0 16px;
  letter-spacing: .1em;
}
.pain-card h3 {
  font-size: 20px;
  margin: 0 0 10px;
  font-weight: 600;
  letter-spacing: -.01em;
}
.pain-card p {
  color: var(--fg-1);
  margin: 0;
  font-size: 15px;
}

/* ============================================================
   Modes
   ============================================================ */
.modes-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: 1fr;
  margin-top: 32px;
}
@media (min-width: 880px) {
  .modes-grid { grid-template-columns: 1fr 1fr; }
}
.mode-card {
  padding: 32px;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  display: flex;
  flex-direction: column;
  gap: 18px;
  position: relative;
  overflow: hidden;
}
.mode-card::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(160deg, rgba(229,122,62,.06), transparent 55%);
}
.mode-card > * { position: relative; }
.mode-card header {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.mode-card h3 {
  margin: 0;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -.015em;
}
.mode-tag {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(229,122,62,.15);
  color: var(--accent-2);
  text-transform: uppercase;
}
.mode-tag.tag-mon {
  background: rgba(122,176,103,.15);
  color: var(--ok-2);
}
.mode-card > p {
  color: var(--fg-1);
  margin: 0;
}
.mode-list {
  list-style: none;
  padding: 0;
  margin: 4px 0 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.mode-list li {
  padding-left: 22px;
  position: relative;
  color: var(--fg-1);
  font-size: 15px;
}
.mode-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ============================================================
   Ownership three-state
   ============================================================ */
.states {
  display: grid;
  gap: 16px;
  margin-top: 48px;
  grid-template-columns: 1fr;
  align-items: stretch;
}
@media (min-width: 960px) {
  .states {
    grid-template-columns: 1fr auto 1fr auto 1fr;
  }
}
.state {
  padding: 26px;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.state h4 {
  margin: 4px 0;
  font-size: 18px;
  letter-spacing: -.01em;
}
.state p {
  margin: 0;
  color: var(--fg-1);
  font-size: 14px;
}
.state-sub {
  color: var(--fg-2) !important;
  font-size: 12px !important;
  font-family: var(--font-mono);
  margin-top: auto !important;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
}
.state-badge {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--bg-3);
  color: var(--fg-1);
  letter-spacing: .06em;
}
.state.managed .state-badge  { background: rgba(229,122,62,.18); color: var(--accent-2); }
.state.owned   .state-badge  { background: rgba(122,176,103,.18); color: var(--ok-2); }
.state.released .state-badge { background: rgba(216,154,74,.18);  color: var(--warn); }
.state-arrow {
  display: none;
  align-self: center;
  justify-self: center;
  color: var(--fg-3);
  font-size: 22px;
  font-family: var(--font-mono);
}
@media (min-width: 960px) {
  .state-arrow { display: block; }
}

/* ============================================================
   Carriers
   ============================================================ */
.carrier-grid {
  display: grid;
  gap: 16px;
  margin-top: 32px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.carrier-card {
  padding: 26px;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.carrier-card h4 {
  margin: 0 0 4px;
  font-size: 20px;
  letter-spacing: -.01em;
}
.carrier-card p {
  margin: 8px 0 0;
  color: var(--fg-2);
  font-size: 12.5px;
  font-family: var(--font-mono);
}
.carrier-card.soon { opacity: .72; }
.status {
  display: inline-block;
  align-self: flex-start;
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 999px;
  font-family: var(--font-mono);
  letter-spacing: .06em;
  text-transform: uppercase;
}
.status.ok   { background: rgba(122,176,103,.15); color: var(--ok-2); }
.status.next { background: var(--bg-3); color: var(--fg-1); }

/* ============================================================
   Scenes
   ============================================================ */
.scene-grid {
  display: grid;
  gap: 12px;
  margin-top: 32px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.scene {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--r);
  font-size: 14.5px;
  color: var(--fg-0);
  transition: border-color var(--tr), transform var(--tr);
}
.scene:hover {
  border-color: var(--accent-dim);
  transform: translateY(-1px);
}
.scene-icon { font-size: 18px; }
.scene-footer {
  margin-top: 24px;
  color: var(--fg-2);
  font-size: 14px;
}

/* ============================================================
   Privacy
   ============================================================ */
.privacy {
  background: linear-gradient(180deg, transparent, rgba(229,122,62,.04));
}
.privacy-inner { max-width: 760px; }
.privacy-list {
  list-style: none;
  padding: 0;
  margin: 28px 0 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.privacy-list li {
  padding: 18px 22px;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--r);
  color: var(--fg-1);
}
.privacy-list strong {
  color: var(--fg-0);
  margin-right: 10px;
  font-weight: 600;
}
.privacy-link {
  margin: 24px 0 0;
  font-family: var(--font-mono);
  font-size: 14px;
}
.privacy-link a { color: var(--accent); }

/* ============================================================
   Founder
   ============================================================ */
.founder-inner { max-width: 780px; }
.founder-copy p {
  color: var(--fg-1);
  margin: 0 0 18px;
  font-size: 17px;
}

/* ============================================================
   FAQ
   ============================================================ */
.faq details {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 0;
  margin-top: 12px;
  overflow: hidden;
  transition: border-color var(--tr), background var(--tr);
}
.faq details[open] {
  border-color: var(--border-2);
  background: var(--bg-2);
}
.faq summary {
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 500;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}
.faq summary::after {
  content: "+";
  color: var(--accent);
  font-size: 22px;
  line-height: 1;
  transition: transform var(--tr);
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq summary::-webkit-details-marker { display: none; }
.faq p {
  padding: 0 24px 22px;
  margin: 0;
  color: var(--fg-1);
}

/* ============================================================
   CTA
   ============================================================ */
.cta {
  background:
    radial-gradient(ellipse 70% 80% at 50% 0%, rgba(229,122,62,.16), transparent 70%),
    var(--bg-0);
  text-align: center;
}
.cta-inner { max-width: 720px; margin: 0 auto; }
.cta h2 {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.2;
  letter-spacing: -.02em;
  margin: 0 0 20px;
}
.cta p {
  color: var(--fg-1);
  margin: 0 0 32px;
  font-size: 17px;
}
.cta-sub {
  font-size: 13px !important;
  color: var(--fg-2) !important;
  margin-top: 22px !important;
  font-family: var(--font-mono);
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  border-top: 1px solid var(--border);
  padding: 48px 0 44px;
  color: var(--fg-2);
  font-size: 14px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}
@media (min-width: 720px) {
  .footer-inner {
    grid-template-columns: 1fr auto 1fr;
    align-items: start;
  }
}
.footer .brand { margin-bottom: 8px; }
.footer-tag {
  margin: 0;
  color: var(--fg-2);
  font-size: 13px;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-self: center;
}
.footer-legal {
  text-align: left;
  margin: 0;
  line-height: 1.7;
}
@media (min-width: 720px) {
  .footer-legal { text-align: right; }
}

/* ============================================================
   Utility
   ============================================================ */
.hero + .section,
.section:first-of-type { border-top: none; }

/* ============================================================
   Content pages (about / privacy / changelog)
   ============================================================ */
.page {
  padding: 72px 0 96px;
  max-width: 760px;
  margin: 0 auto;
}
.page .eyebrow { margin-bottom: 20px; }
.page h1 {
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.1;
  letter-spacing: -.03em;
  margin: 0 0 24px;
}
.page h2 {
  font-size: 22px;
  letter-spacing: -.01em;
  margin: 48px 0 16px;
  font-weight: 600;
}
.page h3 {
  font-size: 17px;
  margin: 28px 0 10px;
  color: var(--fg-0);
  font-weight: 600;
}
.page p {
  color: var(--fg-1);
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.75;
}
.page ul, .page ol {
  color: var(--fg-1);
  padding-left: 22px;
  margin: 0 0 18px;
}
.page li { margin-bottom: 8px; }
.page strong { color: var(--fg-0); }
.page blockquote {
  margin: 24px 0;
  padding: 16px 20px;
  border-left: 3px solid var(--accent);
  background: var(--bg-1);
  border-radius: 0 var(--r) var(--r) 0;
  color: var(--fg-1);
}
.page hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 40px 0;
}
.page code {
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 2px 6px;
  background: var(--bg-2);
  border-radius: 4px;
  color: var(--accent-2);
}

/* Changelog timeline */
.timeline {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  border-left: 1px solid var(--border);
}
.timeline li {
  position: relative;
  padding: 0 0 28px 24px;
}
.timeline li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg-0);
  border: 2px solid var(--accent);
}
.timeline li.done::before { background: var(--accent); }
.timeline li.next::before { border-color: var(--fg-3); }
.timeline time {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: .06em;
  display: block;
  margin-bottom: 4px;
}
.timeline h3 { margin: 0 0 6px; font-size: 16px; }
.timeline p { font-size: 14.5px; margin: 0; }