/* ============================================================
   ARC — landing page
   ============================================================ */

:root {
  --bg: #0a0a0c;
  --bg-2: #0f1014;
  --bg-3: #15171c;
  --line: rgba(255,255,255,0.08);
  --line-2: rgba(255,255,255,0.14);
  --fg: #e9eaee;
  --fg-dim: #a4a8b3;
  --fg-mute: #6b6f7a;
  --accent: #7ee0c4;
  --accent-2: #c8b6ff;
  --warn: #ffd66b;
  --max: 1320px;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { background: var(--bg); color: var(--fg); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
body { line-height: 1.55; font-weight: 400; }
a { color: inherit; text-decoration: none; }
em { font-style: italic; color: var(--accent); font-weight: 500; }
.mono { font-family: var(--mono); }
.muted { color: var(--fg-mute); font-weight: 400; }
.dot { color: var(--fg-mute); margin: 0 8px; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 32px; }

/* ===================== NAV ===================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(10,10,12,0.7);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 8px; font-family: var(--mono); font-weight: 600; }
.brand-mark { color: var(--accent); }
.brand-name { letter-spacing: 2px; }
.nav-links { display: flex; gap: 28px; font-size: 14px; color: var(--fg-dim); }
.nav-links a:hover { color: var(--fg); }
.nav-cta {
  font-family: var(--mono);
  font-size: 13px;
  padding: 8px 14px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  color: var(--fg);
  transition: border-color .2s, background .2s;
}
.nav-cta:hover { border-color: var(--accent); background: rgba(126,224,196,0.06); }

/* ===================== HERO ===================== */
.hero {
  position: relative;
  padding: 120px 0 110px;
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.grid-bg {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at center top, rgba(0,0,0,0.9), transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center top, rgba(0,0,0,0.9), transparent 70%);
  pointer-events: none;
}
.hero .container { position: relative; }

.hero-meta {
  display: inline-flex;
  align-items: center;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-mute);
  letter-spacing: 1px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  margin-bottom: 36px;
}
.hero-meta .dot { margin: 0 6px; }

.hero-title {
  font-size: clamp(38px, 6vw, 72px);
  line-height: 1.05;
  letter-spacing: -1.5px;
  font-weight: 700;
  max-width: 1240px;
  margin-bottom: 28px;
}
.hero-sub {
  font-size: clamp(17px, 1.4vw, 20px);
  color: var(--fg-dim);
  max-width: 1100px;
  margin-bottom: 40px;
}

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary, .btn-ghost {
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 15px;
  padding: 14px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform .15s, background .2s, border-color .2s;
}
.btn-primary { background: var(--accent); color: #0a1410; }
.btn-primary:hover { transform: translateY(-1px); background: #95edd2; }
.btn-ghost { border-color: var(--line-2); color: var(--fg); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.hero-foot {
  margin-top: 60px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-mute);
  letter-spacing: 1px;
}

/* ===================== SECTION COMMON ===================== */
.section { padding: 110px 0; border-bottom: 1px solid var(--line); }
.chapter {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-mute);
  letter-spacing: 2px;
  margin-bottom: 24px;
}
.section-title {
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.1;
  letter-spacing: -1px;
  font-weight: 700;
  max-width: 900px;
  margin-bottom: 28px;
}
.section-title.big {
  font-size: clamp(44px, 6vw, 80px);
  text-align: center;
  max-width: none;
  margin: 0 auto 24px;
}
.lede {
  font-size: 19px;
  color: var(--fg-dim);
  max-width: 760px;
}
.lede.center { text-align: center; margin: 0 auto 48px; }
.closing {
  margin-top: 56px;
  font-size: 16px;
  color: var(--fg-dim);
  padding-top: 28px;
  border-top: 1px dashed var(--line-2);
}
.closing.mono { font-family: var(--mono); color: var(--accent); }

/* ===================== SHIFT ===================== */
.shift { background: var(--bg-2); }
.shift-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.shift-stat {
  background: linear-gradient(180deg, rgba(126,224,196,0.06), rgba(126,224,196,0.01));
  border: 1px solid var(--line-2);
  border-radius: 24px;
  padding: 48px;
  text-align: center;
}
.stat-label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--fg-mute);
  margin-bottom: 16px;
}
.stat-number {
  font-size: clamp(80px, 11vw, 160px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -4px;
  color: var(--fg);
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 10px;
}
.stat-number .times { color: var(--accent); font-size: 0.6em; font-weight: 500; }
.stat-number.small { font-size: clamp(48px, 5vw, 72px); letter-spacing: -2px; }
.stat-caption {
  margin-top: 16px;
  font-size: 16px;
  color: var(--fg-dim);
}

/* ===================== PROBLEM ===================== */
.three-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.col-card {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px;
  transition: border-color .2s, transform .2s;
}
.col-card:hover { border-color: var(--line-2); transform: translateY(-2px); }
.col-card .roman {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 2px;
  margin-bottom: 16px;
}
.col-card .card-tag {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-mute);
  letter-spacing: 2px;
  margin-bottom: 16px;
}
.col-card h3 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.3px;
}
.col-card .card-lede {
  color: var(--fg);
  font-weight: 500;
  margin-bottom: 8px;
}
.col-card p { color: var(--fg-dim); font-size: 15px; }

/* ===================== INSIGHT ===================== */
.insight { text-align: center; background: linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%); }
.insight .chapter { text-align: center; }
.insight-grid {
  display: grid;
  grid-template-columns: 1fr;
  max-width: 720px;
  margin: 0 auto;
  border: 1px solid var(--line-2);
  border-radius: 16px;
  overflow: hidden;
}
.i-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  padding: 22px 28px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  align-items: center;
}
.i-row:last-child { border-bottom: none; }
.i-key {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 1.5px;
  color: var(--accent);
}
.i-val { font-size: 18px; font-weight: 500; }

/* ===================== PROTOCOL ===================== */
.protocol-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: stretch;
  margin-top: 48px;
}
.stack { display: flex; flex-direction: column; gap: 12px; }
.layer {
  display: flex;
  gap: 20px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px 24px;
  flex: 1;
  align-items: center;
  transition: border-color .2s, background .2s;
}
.layer:hover { border-color: var(--accent); background: rgba(126,224,196,0.03); }
.layer-tag {
  font-family: var(--mono);
  font-weight: 600;
  color: var(--accent);
  font-size: 14px;
  padding: 6px 10px;
  border: 1px solid var(--line-2);
  border-radius: 6px;
  letter-spacing: 1px;
}
.layer-name { font-weight: 600; font-size: 17px; margin-bottom: 2px; }
.layer-desc { font-size: 14px; color: var(--fg-dim); }

.terminal {
  background: #07080a;
  border: 1px solid var(--line-2);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.term-bar {
  background: #131418;
  border-bottom: 1px solid var(--line);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.term-bar .dot {
  width: 12px; height: 12px; border-radius: 50%; display: inline-block; margin: 0;
}
.term-bar .red { background: #ff5f56; }
.term-bar .yellow { background: #ffbd2e; }
.term-bar .green { background: #27c93f; }
.term-title {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-mute);
  margin-left: 12px;
}
.term-body {
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.7;
  padding: 22px 24px;
  color: var(--fg);
  white-space: pre;
  overflow-x: auto;
  flex: 1;
}
.term-body .prompt { color: var(--accent); }
.term-body .cmd { color: var(--fg); }
.term-body .ok { color: var(--accent); }
.term-body .comment { color: var(--fg-mute); }

/* ===================== MOATS ===================== */
.moats { background: var(--bg-2); }
.moat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.moat {
  position: relative;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 36px 32px;
  overflow: hidden;
}
.moat-num {
  position: absolute;
  top: 24px; right: 28px;
  font-family: var(--mono);
  font-size: 56px;
  font-weight: 700;
  color: rgba(255,255,255,0.04);
  letter-spacing: -2px;
}
.moat-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--accent);
  margin-bottom: 14px;
}
.moat h3 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.3px;
}
.moat p { color: var(--fg-dim); font-size: 15px; max-width: 480px; }

/* ===================== WINDOW ===================== */
.window-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  margin-top: 48px;
}
.eras { padding: 8px 0; }
.era-head, .forces-head {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-mute);
  letter-spacing: 2px;
  margin-bottom: 24px;
}
.era-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
}
.era-row .era-name { color: var(--fg-dim); font-size: 13px; letter-spacing: 1px; }
.era-row .era-std { font-size: 20px; font-weight: 600; color: var(--fg); letter-spacing: 1px; }
.era-row.hi .era-name { color: var(--fg); }
.era-row.hi .era-std { color: var(--accent); font-size: 24px; }

.forces { display: flex; flex-direction: column; gap: 24px; }
.force {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 16px;
  padding: 20px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 12px;
}
.force-key {
  font-family: var(--mono);
  font-weight: 600;
  color: var(--accent);
  font-size: 14px;
  letter-spacing: 1px;
}
.force h4 { font-size: 17px; font-weight: 600; margin-bottom: 6px; }
.force p { color: var(--fg-dim); font-size: 14px; }

/* ===================== BET ===================== */
.bet-stat {
  display: flex;
  justify-content: center;
  margin: 48px 0;
  padding: 36px;
  background: linear-gradient(180deg, rgba(200,182,255,0.07), transparent);
  border: 1px solid var(--line-2);
  border-radius: 20px;
  text-align: center;
}
.bet-stat .stat-number .num { color: var(--accent-2); }
.bet-cols { margin-top: 32px; }

/* ===================== TEAM ===================== */
.team { background: var(--bg-2); }
.team-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 48px;
}
.team-card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 36px;
}
.team-card h3 {
  font-size: 14px;
  font-family: var(--mono);
  color: var(--fg-mute);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.founders {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.3px;
  margin-bottom: 18px;
}
.bullets { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.bullets li {
  font-size: 15px;
  color: var(--fg-dim);
  padding-left: 18px;
  position: relative;
}
.bullets li::before {
  content: "›";
  position: absolute;
  left: 0;
  color: var(--accent);
}
.bullets a { color: var(--accent); }
.bullets a:hover { text-decoration: underline; }

.milestone {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  align-items: center;
}
.milestone:last-child { border-bottom: none; }
.m-key {
  font-family: var(--mono);
  color: var(--accent);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 1px;
}

/* ===================== CTA ===================== */
.cta {
  background: radial-gradient(ellipse at center, rgba(126,224,196,0.08), transparent 70%);
  text-align: center;
}
.cta-inner { max-width: 720px; }
.cta h2 {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 16px;
}
.cta p { color: var(--fg-dim); font-size: 18px; margin-bottom: 32px; }
.cta-form {
  display: flex;
  gap: 8px;
  max-width: 480px;
  margin: 0 auto 24px;
  flex-wrap: wrap;
  justify-content: center;
}
.cta-form input {
  flex: 1;
  min-width: 240px;
  padding: 14px 18px;
  font-size: 15px;
  background: var(--bg-2);
  border: 1px solid var(--line-2);
  border-radius: 999px;
  color: var(--fg);
  font-family: var(--sans);
  outline: none;
}
.cta-form input:focus { border-color: var(--accent); }
.cta-form button {
  padding: 14px 22px;
  background: var(--accent);
  color: #0a1410;
  border: none;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  font-family: var(--sans);
  cursor: pointer;
  transition: background .2s, transform .15s;
}
.cta-form button:hover { background: #95edd2; transform: translateY(-1px); }
.cta-form .ok {
  width: 100%;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 13px;
  margin-top: 8px;
}
.cta-contacts { font-family: var(--mono); font-size: 13px; color: var(--fg-mute); }
.cta-contacts a:hover { color: var(--accent); }

/* ===================== FOOTER ===================== */
.footer { padding: 32px 0; border-top: 1px solid var(--line); }
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  gap: 20px;
  flex-wrap: wrap;
}
.footer-inner .brand-mark { margin-right: 6px; color: var(--accent); }
.footer-inner strong { letter-spacing: 2px; margin-right: 8px; }

/* ===================== RESPONSIVE ===================== */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .shift-grid,
  .protocol-grid,
  .window-grid,
  .team-grid { grid-template-columns: 1fr; gap: 32px; }
  .three-col { grid-template-columns: 1fr; }
  .moat-grid { grid-template-columns: 1fr; }
  .i-row { grid-template-columns: 1fr; gap: 6px; }
  .section { padding: 72px 0; }
  .hero { padding: 80px 0 72px; }
  .container { padding: 0 20px; }
}