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

:root {
  --bg:        #0d0d0d;
  --bg2:       #141414;
  --bg3:       #1a1a1a;
  --bg4:       #202020;
  --border:    rgba(255,255,255,0.07);
  --border2:   rgba(255,255,255,0.12);
  --ink:       #e8e8e8;
  --muted:     #707070;
  --soft:      #444;
  --green:     #3dd68c;
  --green-dim: rgba(61,214,140,0.12);
  --blue:      #60a5fa;
  --blue-dim:  rgba(96,165,250,0.12);
  --purple:    #a78bfa;
  --purple-dim:rgba(167,139,250,0.12);
  --orange:    #fb923c;
  --yellow:    #fbbf24;
  --r:         8px;
  --r-lg:      14px;
  --mono:      'JetBrains Mono', monospace;
  --sans:      'Inter', sans-serif;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 1060px; margin: 0 auto; padding: 0 28px; }

/* ── HERO BACKGROUND ── */
#hero { margin: 0; padding: 0; }
.hero-bg {
  position: relative;
  background-size: cover;
  background-position: center 30%;
  background-repeat: no-repeat;
  min-height: 88vh;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border);
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(
    to right,
    rgba(13,13,13,0.97) 0%,
    rgba(13,13,13,0.88) 55%,
    rgba(13,13,13,0.45) 100%
  );
  z-index: 1;
}
.hero-content {
  position: relative; z-index: 2;
  max-width: 620px;
  padding-top: 60px;
  padding-bottom: 60px;
}

.hero-tags {
  display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px;
}
.htag {
  font-family: var(--mono); font-size: 0.72rem;
  color: var(--green); background: var(--green-dim);
  border: 1px solid rgba(61,214,140,0.2);
  padding: 4px 12px; border-radius: 5px;
}

/* ── TOPBAR — OS menubar feel ── */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  background: rgba(13,13,13,0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(20px);
  height: 44px;
  display: flex; align-items: center;
}
.topbar-inner {
  max-width: 1060px; margin: 0 auto; padding: 0 28px;
  width: 100%;
  display: flex; align-items: center; gap: 0;
}
.topbar-logo {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; margin-right: 32px;
}
.topbar-logo-icon {
  width: 18px; height: 18px; border-radius: 4px;
  background: linear-gradient(135deg, var(--green), #22c55e);
  display: flex; align-items: center; justify-content: center;
  font-size: 10px; color: #000; font-weight: 700; flex-shrink: 0;
}
.topbar-logo-name {
  font-family: var(--mono); font-size: 0.78rem; font-weight: 500;
  color: var(--ink); letter-spacing: 0.02em;
}
.topbar-nav {
  display: flex; gap: 2px; flex: 1;
}
.topbar-nav a {
  font-family: var(--mono); font-size: 0.72rem; color: var(--muted);
  text-decoration: none; padding: 4px 12px; border-radius: 5px;
  transition: all 0.15s;
}
.topbar-nav a:hover { color: var(--ink); background: var(--bg3); }
.topbar-status {
  display: flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 0.7rem; color: var(--green);
}
.topbar-status-dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--green);
  animation: blink 2.5s infinite;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.3} }

/* ── HERO ── */
#hero {
  padding: 100px 0 80px;
  border-bottom: 1px solid var(--border);
}
.hero-eyebrow {
  font-family: var(--mono); font-size: 0.72rem; color: var(--muted);
  letter-spacing: 0.06em; text-transform: uppercase;
  margin-bottom: 28px;
  display: flex; align-items: center; gap: 10px;
}
.hero-eyebrow::before {
  content: ''; display: inline-block; width: 20px; height: 1px; background: var(--muted);
}

h1 {
  font-family: var(--mono); font-weight: 600;
  font-size: clamp(1.9rem, 4.5vw, 3.2rem);
  line-height: 1.15; letter-spacing: -0.02em;
  max-width: 680px; margin-bottom: 28px;
  color: var(--ink);
}
h1 .hl-green { color: var(--green); }
h1 .hl-blue  { color: var(--blue); }
h1 .cursor {
  display: inline-block; width: 3px; height: 1em;
  background: var(--green); margin-left: 4px; vertical-align: middle;
  animation: cursor 1s step-end infinite;
}
@keyframes cursor { 0%,100%{opacity:1} 50%{opacity:0} }

.hero-sub {
  font-size: 1rem; color: #d0d0d0;
  max-width: 520px; line-height: 1.75; margin-bottom: 28px;
  text-shadow: 0 1px 8px rgba(0,0,0,0.8);
}

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.btn-primary {
  font-family: var(--mono); font-size: 0.82rem; font-weight: 500;
  background: var(--green); color: #000; border: none; cursor: pointer;
  padding: 11px 24px; border-radius: var(--r); text-decoration: none;
  transition: opacity 0.2s; display: inline-block; letter-spacing: 0.01em;
}
.btn-primary:hover { opacity: 0.85; }
.btn-ghost {
  font-family: var(--mono); font-size: 0.82rem; color: var(--muted);
  border: 1px solid var(--border2); background: transparent; cursor: pointer;
  padding: 11px 24px; border-radius: var(--r); text-decoration: none;
  transition: all 0.2s; display: inline-block;
}
.btn-ghost:hover { color: var(--ink); border-color: var(--soft); }

/* ── OS WINDOW — the terminal demo ── */
.os-window {
  margin-top: 64px;
  background: var(--bg2);
  border: 1px solid var(--border2);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: 0 32px 80px rgba(0,0,0,0.6);
}
.os-titlebar {
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
  padding: 10px 16px;
  display: flex; align-items: center; gap: 12px;
}
.os-dots { display: flex; gap: 6px; }
.os-dot { width: 11px; height: 11px; border-radius: 50%; }
.os-dot.r { background: #ff5f57; }
.os-dot.y { background: #febc2e; }
.os-dot.g { background: #28c840; }
.os-tabs { display: flex; gap: 1px; flex: 1; margin-left: 8px; }
.os-tab {
  font-family: var(--mono); font-size: 0.7rem;
  padding: 4px 14px; border-radius: 5px 5px 0 0; color: var(--muted);
}
.os-tab.active { background: var(--bg2); color: var(--ink); }

.os-body { display: flex; }

/* sidebar */
.os-sidebar {
  width: 180px; flex-shrink: 0;
  border-right: 1px solid var(--border);
  padding: 16px 0;
}
.os-sidebar-section {
  font-family: var(--mono); font-size: 0.65rem;
  color: var(--soft); letter-spacing: 0.08em; text-transform: uppercase;
  padding: 0 14px 8px;
}
.os-sidebar-item {
  font-family: var(--mono); font-size: 0.72rem;
  padding: 6px 14px; color: var(--muted); cursor: default;
  display: flex; align-items: center; gap: 8px;
}
.os-sidebar-item.active { background: var(--bg4); color: var(--ink); }
.os-sidebar-item .si-dot { width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; }

/* main panel */
.os-main { flex: 1; padding: 20px 24px; overflow: hidden; }

.ticket-row {
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: var(--r); padding: 14px 16px; margin-bottom: 12px;
}
.ticket-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 8px;
}
.ticket-id { font-family: var(--mono); font-size: 0.68rem; color: var(--muted); }
.ticket-badge {
  font-family: var(--mono); font-size: 0.62rem; font-weight: 500;
  padding: 2px 8px; border-radius: 4px; letter-spacing: 0.04em;
}
.badge-pending  { background: rgba(251,191,36,0.12); color: var(--yellow); border: 1px solid rgba(251,191,36,0.2); }
.badge-kai      { background: var(--green-dim); color: var(--green); border: 1px solid rgba(61,214,140,0.2); }
.badge-done     { background: rgba(100,100,100,0.12); color: var(--muted); border: 1px solid var(--border); }
.badge-approved { background: var(--blue-dim); color: var(--blue); border: 1px solid rgba(96,165,250,0.2); }
.ticket-title { font-size: 0.82rem; color: var(--ink); font-weight: 500; margin-bottom: 4px; }
.ticket-meta { font-family: var(--mono); font-size: 0.67rem; color: var(--muted); }

/* conversation panel */
.os-convo { flex: 1; border-left: 1px solid var(--border); padding: 20px 24px; background: var(--bg2); min-width: 0; }
.convo-header { margin-bottom: 20px; padding-bottom: 14px; border-bottom: 1px solid var(--border); }
.convo-title { font-family: var(--mono); font-size: 0.78rem; color: var(--ink); font-weight: 500; }
.convo-sub { font-family: var(--mono); font-size: 0.67rem; color: var(--muted); margin-top: 2px; }

.msg { margin-bottom: 16px; }
.msg-label {
  font-family: var(--mono); font-size: 0.64rem; color: var(--soft);
  margin-bottom: 4px; display: flex; align-items: center; gap: 6px;
}
.msg-label .ml-name { font-weight: 500; }
.ml-name.you    { color: var(--muted); }
.ml-name.alex   { color: var(--blue); }
.ml-name.kai    { color: var(--green); }
.msg-body {
  font-family: var(--mono); font-size: 0.74rem; line-height: 1.7;
  color: var(--ink); background: var(--bg3); border: 1px solid var(--border);
  border-radius: var(--r); padding: 10px 14px;
}
.msg-body.you-bubble { border-color: var(--border); color: var(--muted); }
.msg-body .t-green  { color: var(--green); }
.msg-body .t-blue   { color: var(--blue); }
.msg-body .t-yellow { color: var(--yellow); }
.msg-body .t-muted  { color: var(--muted); }
.msg-body .t-bold   { font-weight: 600; }

/* ── SECTION BASE ── */
section { padding: 80px 0; border-bottom: 1px solid var(--border); }
.sec-label {
  font-family: var(--mono); font-size: 0.68rem; color: var(--muted);
  letter-spacing: 0.1em; text-transform: uppercase;
  margin-bottom: 20px; display: flex; align-items: center; gap: 10px;
}
.sec-label::before { content:''; display:inline-block; width:16px; height:1px; background:var(--soft); }
h2 {
  font-family: var(--mono); font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 600; letter-spacing: -0.02em; line-height: 1.2; margin-bottom: 12px;
}
.sec-sub { font-size: 0.95rem; color: var(--muted); max-width: 500px; line-height: 1.75; margin-bottom: 48px; }

/* ── HOW IT WORKS ── */
.steps { display: grid; grid-template-columns: repeat(3,1fr); gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: var(--r-lg); overflow: hidden; }
.step { background: var(--bg2); padding: 32px 28px; }
.step-num { font-family: var(--mono); font-size: 0.65rem; color: var(--soft); letter-spacing: 0.08em; margin-bottom: 20px; display: block; }
.step h3 { font-family: var(--mono); font-size: 0.9rem; font-weight: 600; margin-bottom: 10px; }
.step p { font-size: 0.85rem; color: var(--muted); line-height: 1.7; }
.step-tag {
  display: inline-block; margin-top: 18px;
  font-family: var(--mono); font-size: 0.65rem;
  background: var(--bg3); border: 1px solid var(--border);
  padding: 3px 10px; border-radius: 5px; color: var(--muted);
}

/* ── AGENTS ── */
.agents { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
.agent {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--r-lg); padding: 28px 24px;
}
.agent-header { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.agent-avatar {
  width: 36px; height: 36px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 0.68rem; font-weight: 600;
  letter-spacing: 0.04em; flex-shrink: 0;
}
.av-alex   { background: var(--blue-dim);   color: var(--blue);   border: 1px solid rgba(96,165,250,0.2); }
.av-kai    { background: var(--green-dim);  color: var(--green);  border: 1px solid rgba(61,214,140,0.2); }
.av-aria   { background: var(--purple-dim); color: var(--purple); border: 1px solid rgba(167,139,250,0.2); }
.agent-name { font-family: var(--mono); font-size: 0.88rem; font-weight: 600; }
.agent-role { font-family: var(--mono); font-size: 0.65rem; color: var(--muted); margin-top: 2px; }
.agent-desc { font-size: 0.84rem; color: var(--muted); line-height: 1.7; margin-bottom: 16px; }
.agent-caps { display: flex; flex-wrap: wrap; gap: 6px; }
.cap {
  font-family: var(--mono); font-size: 0.62rem; color: var(--muted);
  background: var(--bg3); border: 1px solid var(--border);
  padding: 3px 9px; border-radius: 5px;
}

/* ── KNOWLEDGE BASE ── */
.kb-demo {
  background: var(--bg2); border: 1px solid var(--border2);
  border-radius: var(--r-lg); overflow: hidden;
}
.kb-bar {
  background: var(--bg3); border-bottom: 1px solid var(--border);
  padding: 10px 16px;
  display: flex; align-items: center; gap: 10px;
}
.kb-bar-title { font-family: var(--mono); font-size: 0.7rem; color: var(--muted); }
.kb-body { display: flex; }
.kb-tree {
  width: 220px; flex-shrink: 0; border-right: 1px solid var(--border);
  padding: 16px 0; font-family: var(--mono); font-size: 0.7rem;
}
.kt-folder { color: var(--blue); padding: 3px 16px; }
.kt-file   { color: var(--muted); padding: 3px 16px 3px 32px; cursor: default; }
.kt-file.active { color: var(--green); }
.kt-file.active::before { content: '▶ '; font-size: 0.6rem; }
.kb-content { flex: 1; padding: 20px 24px; font-family: var(--mono); font-size: 0.72rem; line-height: 1.8; color: var(--muted); overflow: hidden; }
.kc-key   { color: var(--blue); }
.kc-val   { color: var(--green); }
.kc-str   { color: var(--yellow); }
.kc-com   { color: var(--soft); }
.kc-head  { color: var(--purple); font-weight: 600; }

/* ── OS PROMISE ── */
.promise-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 16px; }
.promise-item {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--r-lg); padding: 24px 22px;
  display: flex; gap: 16px; align-items: flex-start;
}
.promise-icon {
  font-family: var(--mono); font-size: 0.65rem; font-weight: 600;
  width: 32px; height: 32px; border-radius: 7px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; margin-top: 2px;
}
.pi-green  { background: var(--green-dim);  color: var(--green);  border: 1px solid rgba(61,214,140,0.2); }
.pi-blue   { background: var(--blue-dim);   color: var(--blue);   border: 1px solid rgba(96,165,250,0.2); }
.pi-purple { background: var(--purple-dim); color: var(--purple); border: 1px solid rgba(167,139,250,0.2); }
.pi-orange { background: rgba(251,146,60,0.1); color: var(--orange); border: 1px solid rgba(251,146,60,0.2); }
.promise-text h3 { font-family: var(--mono); font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; }
.promise-text p  { font-size: 0.82rem; color: var(--muted); line-height: 1.65; }

/* ── CTA ── */
#cta { text-align: center; border-bottom: none; }
#cta h2 { margin-bottom: 12px; }
#cta p { color: var(--muted); max-width: 440px; margin: 0 auto 36px; font-size: 0.95rem; }
.cta-mono {
  font-family: var(--mono); font-size: 0.78rem; color: var(--soft);
  margin-top: 20px;
}
.cta-mono a { color: var(--green); text-decoration: none; }
.cta-mono a:hover { text-decoration: underline; }

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--border);
  padding: 24px 28px;
}
.footer-inner {
  max-width: 1060px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
}
.footer-logo { font-family: var(--mono); font-size: 0.72rem; color: var(--soft); }
.footer-right { font-family: var(--mono); font-size: 0.7rem; color: var(--soft); }

/* ── RESPONSIVE ── */
@media (max-width: 860px) {
  .hero-content { max-width: 100%; }
  .hero-overlay { background: rgba(13,13,13,0.88); }
  .steps, .agents { grid-template-columns: 1fr; }
  .promise-grid   { grid-template-columns: 1fr; }
  .os-sidebar     { display: none; }
  .os-body        { flex-direction: column; }
  .os-main        { border-bottom: 1px solid var(--border); }
  .os-convo       { border-left: none; }
}
@media (max-width: 600px) {
  .kb-tree { display: none; }
  .topbar-nav { display: none; }
}