/* ============================================================
   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;
}
.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; }

.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-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: clamp(24px, 5vw, 64px);
  align-items: center;
}
.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;
}
.hero-actions { display: flex; gap: 14px; margin-top: 34px; flex-wrap: wrap; }
.hero-actions--center { justify-content: center; }
.hero-foot { margin-top: 28px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  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:hover { transform: translateY(-2px); }
.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); }

.hero-mark { display: flex; flex-direction: column; align-items: center; gap: 16px; }
.hero-mark img { width: min(260px, 60vw); height: auto; }
.mark-cap { font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--dim-2); }
@media (max-width: 820px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-mark { order: -1; align-items: flex-start; }
  .hero-mark img { width: 120px; }
  .mark-cap { display: none; }
}

/* ── 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(2, 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: 820px) { .why-grid { grid-template-columns: 1fr; } }

/* ── INSTALL ─────────────────────────────────────────── */
.install { max-width: 720px; margin: 0 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; }
.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 { color: var(--paper); }

/* ── 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); }

/* ── 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; }
}