/* ForceFlow — design tokens & base styles */

:root {
  /* dark (default) */
  --bg: #08090c;
  --bg-1: #0d0f14;
  --bg-2: #14171f;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);
  --fg: #f4f5f7;
  --fg-2: #b9bdc7;
  --fg-3: #7c8190;
  --fg-4: #4a4f5c;
  --accent: #3b82f6;
  --accent-fg: #fff;
  --accent-soft: color-mix(in oklab, var(--accent) 14%, transparent);
  --accent-soft-2: color-mix(in oklab, var(--accent) 6%, transparent);

  --font-sans: "Geist", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono: var(--font-sans);

  --radius: 14px;
  --radius-sm: 8px;
  --radius-lg: 22px;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

:root[data-theme="light"] {
  --bg: #f6f6f3;
  --bg-1: #ffffff;
  --bg-2: #efefea;
  --line: rgba(0, 0, 0, 0.08);
  --line-strong: rgba(0, 0, 0, 0.16);
  --fg: #0c0d10;
  --fg-2: #353841;
  --fg-3: #5f6473;
  --fg-4: #9499a5;
  --accent-fg: #fff;
  --accent-soft: color-mix(in oklab, var(--accent) 14%, transparent);
  --accent-soft-2: color-mix(in oklab, var(--accent) 6%, transparent);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-feature-settings: "ss01", "ss02", "cv11";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

::selection { background: var(--accent); color: var(--accent-fg); }

/* ─────────── Layout ─────────── */

.wrap {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
}

.section {
  position: relative;
  padding: 120px 0;
}

.section-head {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 18px;
  margin-bottom: 56px;
}
.section-head > div:first-child {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.section-head h2 {
  font-size: clamp(40px, 5.4vw, 76px);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.02;
  margin: 0;
  max-width: 1100px;
  text-wrap: balance;
}
/* ─────────── Section eyebrow — accent label ─────────── */
.eyebrow {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
  line-height: 1;
  max-width: 100%;
}
.eyebrow-label {
  color: var(--accent);
  opacity: 0;
  transform: translateY(2px);
  transition: opacity 380ms var(--ease), transform 420ms var(--ease);
}
.eyebrow.is-in .eyebrow-label {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .eyebrow .eyebrow-label {
    transition: none;
    opacity: 1;
    transform: none;
  }
}

/* ─────────── Header ─────────── */

.header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  padding: 0;
  background: color-mix(in oklab, var(--bg) 70%, transparent);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms var(--ease), background 200ms var(--ease);
}
.header.scrolled { border-bottom-color: var(--line); }

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 14px 32px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 32px;
}

.logo {
  display: inline-flex;
  align-items: center;
  color: var(--fg-1);
}
.logo .brand-logo { display: block; }
.brand-logo { color: var(--fg-1); }

.nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
}
.nav a {
  font-size: 13.5px;
  color: var(--fg-2);
  transition: color 200ms var(--ease);
  white-space: nowrap;
}
.nav a:hover { color: var(--fg); }
.nav-cluster {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* ─────────── Language switch ─────────── */
.lang-switch {
  display: inline-flex;
  align-items: center;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in oklab, var(--bg-1) 60%, transparent);
}
.lang-btn {
  appearance: none;
  background: transparent;
  border: 0;
  color: var(--fg-3);
  font: inherit;
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 5px 10px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 180ms var(--ease), color 180ms var(--ease);
  line-height: 1;
  min-width: 30px;
}
.lang-btn:hover { color: var(--fg); }
.lang-btn.on {
  background: var(--fg);
  color: var(--bg);
}
.mobile-lang {
  align-self: flex-start;
  margin-bottom: 8px;
}

/* ─────────── Buttons ─────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: -0.005em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 250ms var(--ease-out),
    background-color 250ms var(--ease), color 250ms var(--ease),
    border-color 250ms var(--ease), box-shadow 250ms var(--ease);
  white-space: nowrap;
  background: transparent;
  color: inherit;
}
.btn-primary {
  background: var(--accent);
  color: var(--accent-fg);
  box-shadow: 0 0 0 0 var(--accent-soft);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 28px -8px var(--accent),
    0 0 0 6px var(--accent-soft-2);
}
.btn-ghost {
  border-color: var(--line-strong);
  color: var(--fg);
}
.btn-ghost:hover {
  background: var(--bg-2);
  border-color: var(--fg-4);
}
.btn-sm { padding: 9px 14px; font-size: 12.5px; }
.btn-lg { padding: 16px 24px; font-size: 14.5px; }

.btn .arrow {
  display: inline-block;
  transition: transform 250ms var(--ease-out);
}
.btn:hover .arrow { transform: translateX(3px); }

/* ─────────── Cards & generic ─────────── */

.card {
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  position: relative;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--fg-3);
  padding: 4px 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg);
}

/* ─────────── Reveal-on-scroll ─────────── */

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 800ms var(--ease-out), transform 800ms var(--ease-out);
  will-change: opacity, transform;
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}
.reveal.delay-1 { transition-delay: 80ms; }
.reveal.delay-2 { transition-delay: 160ms; }
.reveal.delay-3 { transition-delay: 240ms; }
.reveal.delay-4 { transition-delay: 320ms; }
.reveal.delay-5 { transition-delay: 400ms; }
.reveal.delay-6 { transition-delay: 480ms; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  *,
  *::before,
  *::after { animation: none !important; transition-duration: 1ms !important; }
}

/* ─────────── Loader ─────────── */

.loader {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--bg);
  display: grid;
  place-items: center;
  pointer-events: none;
  opacity: 1;
  transition: opacity 600ms var(--ease);
}
.loader.hidden { opacity: 0; pointer-events: none; }
.loader-mark {
  width: 36px; height: 36px;
  animation: pulse 1.4s var(--ease) infinite;
}
@keyframes pulse {
  0%, 100% { opacity: .55; transform: scale(.96) }
  50%      { opacity: 1;    transform: scale(1)   }
}

/* ─────────── Responsive ─────────── */

@media (max-width: 768px) {
  .wrap { padding: 0 20px; }
  .section { padding: 80px 0; }
  .section-head { gap: 14px; margin-bottom: 40px; }
  .header { padding: 12px 20px; }
  .nav { display: none; }
}