/* ============================================================
   interference — landing
   Brand: Ink #0a0a0a · Paper #fafaf7 · JetBrains Mono + Helvetica Neue
   Direction: editorial / Swiss minimal — thin rules, mono eyebrows,
   generous whitespace, one ink band for contrast.
   ============================================================ */

:root {
  --paper: #fafaf7;
  --ink: #0a0a0a;
  --line: rgba(10, 10, 10, 0.10);
  --line-soft: rgba(10, 10, 10, 0.06);
  --dim: rgba(10, 10, 10, 0.55);
  --dim-2: rgba(10, 10, 10, 0.40);
  --paper-dim: rgba(250, 250, 247, 0.55);

  --mono: "JetBrains Mono", ui-monospace, "IBM Plex Mono", monospace;
  --sans: "Helvetica Neue", Helvetica, Arial, sans-serif;

  --maxw: 1180px;
  --pad: clamp(20px, 5vw, 40px);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }

/* grain + faint grid texture for atmosphere */
.grain {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(circle at 50% 30%, #000 0%, transparent 78%);
  opacity: 0.5;
}

/* ── shared bits ─────────────────────────────────────── */
.eyebrow {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
  margin: 0;
}
.ital { font-style: italic; font-family: Georgia, "Times New Roman", serif; font-weight: 400; }

.section { position: relative; z-index: 1; max-width: var(--maxw); margin: 0 auto; padding: clamp(72px, 12vh, 140px) var(--pad); }
.sec-head { margin-bottom: clamp(40px, 6vw, 72px); }
.sec-head h2 {
  font-size: clamp(28px, 4.4vw, 52px);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.04;
  margin: 14px 0 0;
  max-width: 16ch;
}
.sec-head--center { text-align: center; }
.sec-head--center h2 { margin-left: auto; margin-right: auto; }

/* ── NAV ─────────────────────────────────────────────── */
.nav {
  position: sticky; top: 16px; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  max-width: calc(var(--maxw) - 32px); margin: 0 auto;
  padding: 12px 28px;
  background: rgba(250,250,247,0.72);
  backdrop-filter: saturate(160%) blur(16px);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  border-radius: 40px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04), 0 4px 16px rgba(0,0,0,0.04);
}
.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand-mark { display: block; }
.brand-word {
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-weight: 500;
  font-size: 15px;
  letter-spacing: 0.08em;
  text-transform: lowercase;
}
.beta-badge {
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--ink);
  color: var(--paper);
  border-radius: 4px;
  padding: 2px 7px;
  line-height: 1.6;
}
.hero-badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--ink);
  color: var(--paper);
  border-radius: 4px;
  padding: 3px 10px;
  margin-bottom: 18px;
}
.hero-badge--link { transition: transform 0.18s var(--ease), background 0.2s var(--ease); }
.hero-badge--link:hover { transform: translateY(-2px); background: #242424; }
.nav-links { display: flex; align-items: center; gap: clamp(16px, 3vw, 34px); }
.nav-links a {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--dim);
  transition: color 0.2s var(--ease);
}
.nav-links a:hover { color: var(--ink); }
.nav-cta { color: var(--ink) !important; border-bottom: 1px solid var(--ink); padding-bottom: 2px; }
.nav-gh { display: inline-flex; align-items: center; gap: 4px; color: var(--ink); font-family: var(--mono); font-size: 13px; }
.nav-gh:hover { color: var(--dim); }
.gh-stars { font-size: 12px; }
.nav-social { display: inline-flex; align-items: center; color: var(--ink); }
.nav-social:hover { color: var(--dim); }

.lang-switch { display: inline-flex; align-items: center; gap: 0; margin-left: 2px; }
.lang-btn {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  background: none; border: none;
  color: var(--dim);
  cursor: pointer; padding: 2px 0;
  transition: color 0.2s var(--ease);
}
.lang-btn:hover { color: var(--ink); }
.lang-btn.is-active { color: var(--ink); font-weight: 500; }
.lang-sep {
  font-family: var(--mono);
  font-size: 10.5px; color: var(--line);
  margin: 0 3px; user-select: none;
}

@media (max-width: 620px) { .nav-links a:not(.nav-cta) { display: none; } }

/* ── HERO ────────────────────────────────────────────── */
.hero { position: relative; z-index: 1; max-width: var(--maxw); margin: 0 auto; padding: clamp(56px, 10vw, 120px) var(--pad) clamp(40px, 7vw, 90px); }
.hero--centered { display: flex; flex-direction: column; align-items: center; min-height: clamp(480px, 72vh, 720px); justify-content: center; overflow: hidden; }
.hero h1 {
  font-size: clamp(40px, 8.2vw, 96px);
  font-weight: 500;
  letter-spacing: -0.04em;
  line-height: 0.98;
  margin: 18px 0 0;
}
.lede {
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.55;
  color: var(--dim);
  max-width: 46ch;
  margin: 26px 0 0;
}
.lede--center { margin-left: auto; margin-right: auto; color: rgba(10, 10, 10, 0.78); }
.hero-actions { display: flex; gap: 14px; margin-top: 34px; flex-wrap: wrap; }
.hero-actions--center { justify-content: center; }
.hero-foot { margin-top: 28px; }

/* Centered hero: logomark enlarged behind the copy, dimmed + edge-faded so it
   reads as atmosphere, not a competing element. */
.hero-copy--center { position: relative; z-index: 1; width: 100%; max-width: 640px; text-align: center; }
.hero-bg-mark {
  position: absolute; top: 50%; left: 50%; z-index: 0;
  width: min(920px, 150vw); transform: translate(-50%, -50%);
  pointer-events: none; opacity: 0.16; color: var(--ink);
  mask-image: radial-gradient(circle, #000 45%, transparent 72%);
  -webkit-mask-image: radial-gradient(circle, #000 45%, transparent 72%);
}
.hero-bg-mark img { display: block; width: 100%; height: auto; }
.install--hero { margin-top: clamp(56px, 9vw, 96px); max-width: 560px; margin-left: auto; margin-right: auto; }
.install--hero .install-row {
  text-align: left;
  background: var(--ink);
  border-color: rgba(250,250,247,0.14);
  box-shadow: 0 12px 32px rgba(10,10,10,0.12);
}
.install--hero .install-row code { color: #e9e9e3; }
.install--hero .copy { color: var(--paper); border-color: rgba(250,250,247,0.3); }
.install--hero .copy:hover { background: var(--paper); color: var(--ink); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.04em;
  padding: 13px 22px; border-radius: 2px;
  border: 1px solid var(--ink);
  transition: transform 0.18s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease);
}
.btn-gh svg { flex-shrink: 0; }
.hero-actions--community {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  width: min(100%, 420px);
  margin-left: auto;
  margin-right: auto;
}
.btn:hover { transform: translateY(-2px); }
.btn:focus-visible, .hero-badge--link:focus-visible, .nav a:focus-visible, .foot a:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 4px;
}
.btn-ink { background: var(--ink); color: var(--paper); }
.btn-ink:hover { background: #1c1c1c; }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); }
.btn-paper { background: var(--paper); color: var(--ink); border-color: var(--paper); }
.btn-paper:hover { background: transparent; color: var(--paper); border-color: var(--paper); }

@media (max-width: 620px) {
  .hero-bg-mark { width: min(640px, 190vw); opacity: 0.12; }
  .install--hero .install-row { flex-direction: column; align-items: stretch; gap: 10px; }
  .hero-actions--community { grid-template-columns: 1fr; width: min(100%, 260px); }
}

/* ── INK BAND ────────────────────────────────────────── */
.band-ink { position: relative; z-index: 1; background: var(--ink); color: var(--paper); }
.band-ink .eyebrow { color: var(--paper-dim); }
.band-ink .sec-head h2 { color: var(--paper); }

/* terminal */
.term {
  max-width: 860px; margin: clamp(56px, 9vw, 96px) auto;
  border: 1px solid rgba(250,250,247,0.16);
  border-radius: 8px; overflow: hidden;
  background: #0d0d0d;
  box-shadow: 0 24px 60px rgba(0,0,0,0.4);
}
.term-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 11px 14px; border-bottom: 1px solid rgba(250,250,247,0.1);
}
.term-bar .dot { width: 10px; height: 10px; border-radius: 50%; background: rgba(250,250,247,0.22); }
.term-title { margin-left: 10px; font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.08em; color: var(--paper-dim); }
.term-body {
  margin: 0; padding: 22px 24px;
  font-family: var(--mono); font-size: clamp(11.5px, 1.4vw, 13.5px);
  line-height: 1.75; color: #e9e9e3;
  min-height: 280px; white-space: pre-wrap; word-break: break-word;
}
.term-body .u { color: #fafaf7; font-weight: 600; }   /* user prompt */
.term-shot { display: block; width: 100%; border-radius: 0 0 6px 6px; }
.term-body .c { color: #8fb8a8; }                       /* command / tool */
.term-body .m { color: rgba(250,250,247,0.62); }        /* muted/meta */
.term-body .ok { color: #b5d3a8; }
.caret { display: inline-block; width: 9px; color: #fafaf7; animation: blink 1.05s steps(1) infinite; font-family: var(--mono); }
@keyframes blink { 50% { opacity: 0; } }

/* ── STEPS ───────────────────────────────────────────── */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid var(--line); }
.steps li { padding: 32px 26px 40px; border-bottom: 1px solid var(--line); border-right: 1px solid var(--line); position: relative; }
.steps li:nth-child(4n) { border-right: none; }
.step-n { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; color: var(--dim-2); }
.steps h3 { font-size: 18px; font-weight: 500; letter-spacing: -0.01em; margin: 18px 0 8px; }
.steps p { font-size: 13.5px; line-height: 1.5; color: var(--dim); margin: 0; }
.steps code { font-family: var(--mono); font-size: 11.5px; background: rgba(10,10,10,0.05); padding: 1px 5px; border-radius: 3px; }
@media (max-width: 860px) { .steps { grid-template-columns: repeat(2, 1fr); } .steps li:nth-child(4n) { border-right: 1px solid var(--line); } .steps li:nth-child(2n) { border-right: none; } }
@media (max-width: 520px) { .steps { grid-template-columns: 1fr; } .steps li { border-right: none !important; } }

/* ── MODES ───────────────────────────────────────────── */
.modes { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; padding-top: 0; }
.mode-card { border: 1px solid var(--line); border-radius: 6px; padding: clamp(28px, 4vw, 44px); }
.mode-card h3 { font-size: clamp(30px, 4vw, 44px); font-weight: 500; letter-spacing: -0.03em; margin: 14px 0 12px; }
.mode-card p { font-size: 14.5px; line-height: 1.55; color: var(--dim); margin: 0 0 22px; max-width: 42ch; }
.mode-card--ink { background: var(--ink); color: var(--paper); border-color: transparent; }
.mode-card--ink .eyebrow { color: var(--paper-dim); }
.mode-card--ink p { color: rgba(250,250,247,0.7); }
.ticks { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 9px; }
.ticks li { font-family: var(--mono); font-size: 12px; letter-spacing: 0.02em; padding-left: 20px; position: relative; color: inherit; }
.ticks li::before { content: "→"; position: absolute; left: 0; opacity: 0.5; }
.ticks code { font-size: 11.5px; opacity: 0.9; }
@media (max-width: 720px) { .modes { grid-template-columns: 1fr; } }

/* ── FEATURES ────────────────────────────────────────── */
.feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.feat { background: var(--paper); padding: clamp(28px, 3.4vw, 40px); }
.feat-i { display: inline-block; font-size: 22px; line-height: 1; margin-bottom: 20px; }
.feat h3 { font-size: 17px; font-weight: 500; letter-spacing: -0.01em; margin: 0 0 8px; }
.feat p { font-size: 13.5px; line-height: 1.55; color: var(--dim); margin: 0; }
@media (max-width: 860px) { .feat-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .feat-grid { grid-template-columns: 1fr; } }

/* ── WHY ────────────────────────────────────────────── */
.why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.why-card {
  border: 1px solid var(--line); border-radius: 6px;
  padding: clamp(28px, 3.4vw, 40px);
}
.why-n {
  display: block; margin-bottom: 18px;
  font-family: var(--mono); font-size: 42px; font-weight: 500;
  letter-spacing: -0.02em; color: var(--line-soft); line-height: 1;
}
.why-card h3 {
  font-size: 18px; font-weight: 500; letter-spacing: -0.01em; margin: 0 0 10px;
}
.why-card p { font-size: 13.5px; line-height: 1.55; color: var(--dim); margin: 0; }
@media (max-width: 860px) { .why-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .why-grid { grid-template-columns: 1fr; } }

/* ── AGENTIC SWE FRAMEWORK ───────────────────────────── */
.framework-section { padding-top: clamp(90px, 14vh, 160px); }
.framework-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(330px, 0.85fr);
  gap: clamp(36px, 7vw, 88px);
  align-items: end;
  margin-bottom: clamp(52px, 8vw, 88px);
}
.framework-intro .sec-head { margin-bottom: 0; }
.framework-intro .sec-head h2 { max-width: 15ch; }
.fw-lede { text-align: left; max-width: 62ch; margin-top: 24px; }
.framework-actions { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; margin-top: 30px; }
.framework-meta {
  font-family: var(--mono);
  font-size: 10.5px;
  line-height: 1.5;
  letter-spacing: 0.05em;
  color: var(--dim);
}
.protocol-panel {
  position: relative;
  overflow: hidden;
  color: var(--paper);
  background: var(--ink);
  border-radius: 8px;
  padding: clamp(28px, 4vw, 42px);
  box-shadow: 0 24px 54px rgba(10,10,10,0.16);
}
.protocol-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(250,250,247,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(250,250,247,0.045) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}
.protocol-kicker {
  position: relative;
  display: block;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(250,250,247,0.18);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--paper-dim);
}
.protocol-trace { position: relative; list-style: none; margin: 22px 0 0; padding: 0; }
.protocol-trace li {
  display: grid;
  grid-template-columns: 28px 90px minmax(0, 1fr);
  align-items: baseline;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(250,250,247,0.09);
}
.protocol-trace li:last-child { border-bottom: 0; }
.protocol-trace span, .protocol-trace code {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--paper-dim);
}
.protocol-trace strong { font-size: 13px; font-weight: 500; }
.protocol-trace code { overflow-wrap: anywhere; }
.fw-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.fw-card {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: clamp(28px, 3.4vw, 40px);
  background: rgba(250,250,247,0.66);
}
.fw-card .eyebrow { text-transform: none; letter-spacing: 0.02em; }
.fw-card .eyebrow code { font-family: var(--mono); }
.fw-card h3 { font-size: clamp(24px, 3vw, 32px); font-weight: 500; letter-spacing: -0.02em; margin: 12px 0 10px; }
.fw-card p { font-size: 13.5px; line-height: 1.55; color: var(--dim); margin: 0; }
.fw-card em { font-style: italic; color: var(--ink); }
.framework-boundary {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: clamp(18px, 4vw, 42px);
  margin-top: 20px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: clamp(24px, 3vw, 34px);
}
.framework-boundary p { display: flex; flex-direction: column; gap: 8px; margin: 0; }
.framework-boundary strong { font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em; }
.framework-boundary p:last-child { text-align: right; }
.framework-boundary span:not(.boundary-mark) { font-size: 13.5px; line-height: 1.5; color: var(--dim); }
.boundary-mark { font-family: Georgia, serif; font-size: 34px; font-style: italic; color: var(--dim-2); }
.fw-cycle {
  margin: clamp(34px, 5vw, 56px) 0 0; text-align: center;
  font-family: var(--mono); font-size: clamp(12px, 1.5vw, 15px);
  letter-spacing: 0.06em; color: var(--dim);
}
.fw-cycle strong { color: var(--ink); font-weight: 500; }
@media (max-width: 860px) {
  .framework-intro { grid-template-columns: 1fr; align-items: start; }
  .protocol-panel { max-width: 620px; }
  .fw-grid { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .framework-actions { align-items: flex-start; flex-direction: column; }
  .protocol-trace li { grid-template-columns: 24px 76px minmax(0, 1fr); gap: 8px; }
  .framework-boundary { grid-template-columns: 1fr; }
  .framework-boundary p:last-child { text-align: left; }
  .boundary-mark { transform: rotate(90deg); justify-self: start; }
}

/* ── INSTALL ─────────────────────────────────────────── */
.install { max-width: 720px; margin-left: auto; margin-right: auto; }
.install-row {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  border: 1px solid rgba(250,250,247,0.2); border-radius: 4px;
  padding: 16px 18px; background: rgba(250,250,247,0.04);
}
.install-row code { font-family: var(--mono); font-size: clamp(12px, 1.6vw, 14px); color: #e9e9e3; letter-spacing: 0.01em; min-width: 0; overflow-wrap: break-word; }
.copy {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase;
  background: transparent; color: var(--paper); border: 1px solid rgba(250,250,247,0.3);
  padding: 7px 12px; border-radius: 3px; cursor: pointer; flex-shrink: 0;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}
.copy:hover { background: var(--paper); color: var(--ink); }
.copy.done { background: var(--paper); color: var(--ink); }
.install-note { text-align: center; font-family: var(--mono); font-size: 11px; letter-spacing: 0.04em; color: var(--paper-dim); margin: 18px 0 0; }
.install-note code, .install-note a { color: var(--paper); }
.install-note a { text-decoration: underline; text-underline-offset: 2px; }

/* Bun requirement, communicated on both install surfaces */
.hero-requires { text-align: center; font-family: var(--mono); font-size: 12px; letter-spacing: 0.02em; color: rgba(10, 10, 10, 0.6); margin: 14px 0 0; }
.hero-requires a { color: var(--ink); text-decoration: underline; text-underline-offset: 2px; }
.install-step { text-align: left; font-family: var(--mono); font-size: 12px; letter-spacing: 0.02em; color: var(--paper-dim); margin: 22px 0 8px; }
.install-step:first-child { margin-top: 0; }
.install-step strong, .install-step a { color: var(--paper); }
.install-step a { text-decoration: underline; text-underline-offset: 2px; }

/* ── FOOTER ──────────────────────────────────────────── */
.foot { position: relative; z-index: 1; max-width: var(--maxw); margin: 0 auto; padding: 40px var(--pad) 56px; border-top: 1px solid var(--line); }
.foot-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.foot-meta { margin-top: 22px; }
.foot-meta a { border-bottom: 1px solid var(--line); }
.foot-meta a:hover { border-color: var(--ink); }
.foot-row .eyebrow a { color: var(--ink); border-bottom: 1px solid var(--line); }
.foot-row .eyebrow a:hover { border-color: var(--ink); }

/* ── reveal animations ───────────────────────────────── */
.reveal, .reveal-up { opacity: 0; }
.reveal { transform: translateY(8px); animation: rise 0.7s var(--ease) forwards; animation-delay: calc(var(--d, 0) * 90ms + 120ms); }
.reveal-up { transform: translateY(22px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); transition-delay: calc(var(--d, 0) * 80ms); }
.reveal-up.in { opacity: 1; transform: none; }
@keyframes rise { to { opacity: 1; transform: none; } }

@media (prefers-reduced-motion: reduce) {
  .reveal, .reveal-up { opacity: 1 !important; transform: none !important; animation: none !important; transition: none !important; }
  .caret { animation: none; }
  html { scroll-behavior: auto; }
  /* The logomark's pulse is SMIL (<animate> inside the SVG), which CSS
     animation:none cannot stop — hide the purely decorative (aria-hidden)
     background mark outright instead. */
  .hero-bg-mark { display: none; }
}