/* =========================================================================
   One Person Company — Design System v1.0
   Single source of truth for tokens + base components.
   Inspired by Linear / Vercel / Stripe production marketing surfaces.
   All pages MUST consume these tokens; no per-page color/spacing redefinition.
   ========================================================================= */

:root {
  /* ----- Color: dark canvas ladder ---------------------------------------- */
  --bg:           #0a0a0b;            /* page background */
  --bg-2:         #111113;            /* alt section */
  --bg-3:         #161618;            /* card surface */
  --bg-4:         #1c1c1f;            /* elevated card / hover */
  --panel:        rgba(20, 20, 22, 0.92);

  /* ----- Color: text ------------------------------------------------------ */
  --ink:          #fafafa;            /* primary text */
  --ink-2:        #d4d4d8;            /* secondary text */
  --muted:        #a1a1aa;            /* tertiary text, eyebrow */
  --subtle:       #71717a;            /* placeholder, micro */

  /* ----- Color: line / border -------------------------------------------- */
  --line:         rgba(255,255,255,0.08);
  --line-2:       rgba(255,255,255,0.12);
  --line-strong:  rgba(255,255,255,0.18);

  /* ----- Color: accent (brand orange, used sparingly) -------------------- */
  --accent:       #ff5a1f;
  --accent-hover: #ff7240;
  --accent-soft:  rgba(255, 90, 31, 0.12);
  --accent-glow:  rgba(255, 90, 31, 0.32);

  /* ----- Color: semantic -------------------------------------------------- */
  --success:      #4ade80;
  --warning:      #fbbf24;
  --danger:       #ef4444;

  /* ----- Type scale (matches a hardened display ladder) ------------------ */
  --font-sans:    "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono:    ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --fs-display:   clamp(48px, 7.4vw, 88px);  /* hero h1 */
  --fs-h1:        clamp(40px, 5vw, 64px);
  --fs-h2:        clamp(32px, 3.6vw, 48px);
  --fs-h3:        clamp(22px, 2vw, 28px);
  --fs-h4:        18px;
  --fs-lead:      clamp(18px, 1.4vw, 20px);
  --fs-body:      16px;
  --fs-sm:        14px;
  --fs-xs:        13px;
  --fs-micro:     11px;

  --lh-display:   1.02;
  --lh-h1:        1.05;
  --lh-h2:        1.1;
  --lh-h3:        1.25;
  --lh-body:      1.55;
  --lh-tight:     1.35;

  --tracking-display:  -0.035em;
  --tracking-h1:       -0.028em;
  --tracking-h2:       -0.022em;
  --tracking-h3:       -0.014em;
  --tracking-body:     0;
  --tracking-eyebrow:  0.14em;

  --weight-regular: 400;
  --weight-medium:  500;
  --weight-semibold:600;
  --weight-bold:    700;

  /* ----- Spacing scale (4px base) ---------------------------------------- */
  --s-1:   4px;
  --s-2:   8px;
  --s-3:   12px;
  --s-4:   16px;
  --s-5:   20px;
  --s-6:   24px;
  --s-8:   32px;
  --s-10:  40px;
  --s-12:  48px;
  --s-16:  64px;
  --s-20:  80px;
  --s-24:  96px;
  --s-32:  128px;
  --s-40:  160px;

  /* ----- Layout ---------------------------------------------------------- */
  --container:    1200px;
  --container-narrow: 880px;
  --gutter:       24px;
  --gutter-lg:    40px;
  --nav-h:        64px;
  --section-y:    var(--s-24);   /* default vertical section padding */

  /* ----- Radius ---------------------------------------------------------- */
  --r-xs:  4px;
  --r-sm:  6px;
  --r-md:  8px;
  --r-lg:  12px;
  --r-xl:  16px;
  --r-2xl: 20px;
  --r-pill: 999px;

  /* ----- Shadow (stacked, subtle — borders carry weight on dark) -------- */
  --sh-1:  0 1px 2px rgba(0,0,0,0.4);
  --sh-2:  0 4px 12px rgba(0,0,0,0.35), 0 1px 2px rgba(0,0,0,0.3);
  --sh-3:  0 8px 24px rgba(0,0,0,0.45), 0 2px 4px rgba(0,0,0,0.35);
  --sh-glow: 0 0 0 1px rgba(255,90,31,0.4), 0 8px 24px rgba(255,90,31,0.18);

  /* ----- Motion ---------------------------------------------------------- */
  --ease:        cubic-bezier(0.22, 1, 0.36, 1);
  --t-fast:      120ms var(--ease);
  --t-base:      200ms var(--ease);
  --t-slow:      360ms var(--ease);
}

/* =========================================================================
   Reset + base
   ========================================================================= */
*, *::before, *::after { box-sizing: border-box; }
html { background: var(--bg); color: var(--ink); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  font-weight: var(--weight-regular);
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "cv11";
}
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
::selection { background: var(--accent); color: #fff; }

/* =========================================================================
   Type primitives
   ========================================================================= */
.display, h1.display {
  font-size: var(--fs-display);
  line-height: var(--lh-display);
  letter-spacing: var(--tracking-display);
  font-weight: var(--weight-semibold);
  color: var(--ink);
  margin: 0;
}
h1 { font-size: var(--fs-h1); line-height: var(--lh-h1); letter-spacing: var(--tracking-h1); font-weight: var(--weight-semibold); margin: 0; }
h2 { font-size: var(--fs-h2); line-height: var(--lh-h2); letter-spacing: var(--tracking-h2); font-weight: var(--weight-semibold); margin: 0; }
h3 { font-size: var(--fs-h3); line-height: var(--lh-h3); letter-spacing: var(--tracking-h3); font-weight: var(--weight-semibold); margin: 0; }
h4 { font-size: var(--fs-h4); line-height: var(--lh-tight); font-weight: var(--weight-semibold); margin: 0; }
p  { margin: 0; }
.lead { font-size: var(--fs-lead); line-height: 1.5; color: var(--ink-2); font-weight: var(--weight-regular); }
.muted { color: var(--muted); }
.eyebrow {
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-eyebrow);
  color: var(--muted);
  font-weight: var(--weight-medium);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
}
.eyebrow::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

/* =========================================================================
   Layout primitives
   ========================================================================= */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container-narrow { max-width: var(--container-narrow); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: var(--section-y); }
.section-tight { padding-block: var(--s-16); }
.section-alt { background: var(--bg-2); }

.stack-2 > * + * { margin-top: var(--s-2); }
.stack-3 > * + * { margin-top: var(--s-3); }
.stack-4 > * + * { margin-top: var(--s-4); }
.stack-6 > * + * { margin-top: var(--s-6); }
.stack-8 > * + * { margin-top: var(--s-8); }
.stack-12 > * + * { margin-top: var(--s-12); }

/* =========================================================================
   Buttons
   ========================================================================= */
.btn {
  --btn-bg: var(--ink);
  --btn-fg: #0a0a0b;
  --btn-bd: transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  padding: 0 22px;
  border-radius: var(--r-pill);
  font-size: var(--fs-sm);
  font-weight: var(--weight-semibold);
  letter-spacing: -0.005em;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-bd);
  cursor: pointer;
  transition: transform var(--t-fast), background var(--t-base), color var(--t-base), border-color var(--t-base), box-shadow var(--t-base);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.btn-primary { --btn-bg: var(--ink); --btn-fg: #0a0a0b; }
.btn-primary:hover { --btn-bg: #ffffff; }

.btn-secondary {
  --btn-bg: transparent;
  --btn-fg: var(--ink);
  --btn-bd: var(--line-strong);
}
.btn-secondary:hover { --btn-bg: rgba(255,255,255,0.06); --btn-bd: rgba(255,255,255,0.28); }

.btn-ghost {
  --btn-bg: transparent;
  --btn-fg: var(--ink-2);
  --btn-bd: transparent;
  padding: 0 16px;
}
.btn-ghost:hover { --btn-bg: rgba(255,255,255,0.05); --btn-fg: var(--ink); }

.btn-accent {
  --btn-bg: var(--accent);
  --btn-fg: #fff;
}
.btn-accent:hover { --btn-bg: var(--accent-hover); box-shadow: 0 6px 24px var(--accent-glow); }

.btn-sm { height: 36px; padding: 0 16px; font-size: var(--fs-xs); }
.btn-lg { height: 52px; padding: 0 28px; font-size: var(--fs-body); }
.btn .arrow { transition: transform var(--t-base); }
.btn:hover .arrow { transform: translateX(3px); }

/* =========================================================================
   Cards
   ========================================================================= */
.card {
  background: var(--bg-3);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: var(--s-6);
  transition: border-color var(--t-base), background var(--t-base), transform var(--t-base);
}
.card:hover { border-color: var(--line-strong); background: var(--bg-4); }
.card-link { display: block; color: inherit; text-decoration: none; }
.card-link:hover { transform: translateY(-2px); }

.card-lg { padding: var(--s-8); border-radius: var(--r-xl); }

/* =========================================================================
   Badges + tags
   ========================================================================= */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 26px;
  padding: 0 10px;
  border-radius: var(--r-pill);
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--line-2);
  color: var(--ink-2);
  font-size: var(--fs-xs);
  font-weight: var(--weight-medium);
  letter-spacing: -0.002em;
}
.badge-accent {
  background: var(--accent-soft);
  border-color: rgba(255,90,31,0.28);
  color: #ffb18a;
}

/* =========================================================================
   Inputs
   ========================================================================= */
.input {
  height: 44px;
  padding: 0 14px;
  border-radius: var(--r-md);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--line-2);
  color: var(--ink);
  font-size: var(--fs-body);
  font-family: inherit;
  transition: border-color var(--t-base), background var(--t-base);
  width: 100%;
}
.input:hover { border-color: var(--line-strong); }
.input:focus { outline: none; border-color: var(--accent); background: rgba(255,255,255,0.06); }
.input::placeholder { color: var(--subtle); }

/* =========================================================================
   Navigation
   ========================================================================= */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: rgba(10,10,11,0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  gap: var(--s-6);
}
.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: var(--weight-semibold);
  letter-spacing: -0.01em;
  color: var(--ink);
  font-size: 15px;
}
.nav-brand .logo-dot {
  width: 22px; height: 22px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent), #ffb18a);
  box-shadow: 0 0 14px var(--accent-glow);
  display: inline-block;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: var(--s-6);
}
.nav-link {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 12px;
  border-radius: var(--r-md);
  color: var(--muted);
  font-size: var(--fs-sm);
  font-weight: var(--weight-medium);
  transition: color var(--t-base), background var(--t-base);
}
.nav-link:hover { color: var(--ink); background: rgba(255,255,255,0.05); }

.nav-spacer { flex: 1; }
.nav-cta { display: inline-flex; gap: 8px; align-items: center; }
.nav-menu-btn {
  display: none;
  width: 40px; height: 40px;
  border-radius: var(--r-md);
  background: transparent;
  border: 1px solid var(--line-2);
  color: var(--ink);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav-menu-btn:hover { background: rgba(255,255,255,0.05); }

/* mobile menu panel */
.nav-mobile {
  display: none;
  position: fixed;
  inset: var(--nav-h) 0 auto 0;
  z-index: 49;
  padding: var(--s-4) var(--gutter) var(--s-8);
  background: rgba(10,10,11,0.96);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--line);
}
.nav-mobile.open { display: block; }
.nav-mobile a {
  display: block;
  padding: 14px 4px;
  font-size: 17px;
  color: var(--ink-2);
  border-bottom: 1px solid var(--line);
}
.nav-mobile a:last-child { border-bottom: 0; }

@media (max-width: 860px) {
  .nav-links { display: none; }
  .nav-cta .btn-sm:not(.btn-primary) { display: none; }
  .nav-menu-btn { display: inline-flex; }
}

/* =========================================================================
   Footer
   ========================================================================= */
.footer {
  padding-block: var(--s-16);
  border-top: 1px solid var(--line);
  background: var(--bg-2);
}
.footer-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--s-8);
}
.footer h5 { font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: var(--tracking-eyebrow); color: var(--muted); margin: 0 0 var(--s-3); font-weight: var(--weight-semibold); }
.footer a { color: var(--ink-2); font-size: var(--fs-sm); display: block; padding: 4px 0; }
.footer a:hover { color: var(--ink); }
.footer-meta {
  border-top: 1px solid var(--line);
  margin-top: var(--s-12);
  padding: var(--s-6) var(--gutter) 0;
  max-width: var(--container);
  margin-inline: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--s-4);
  flex-wrap: wrap;
  color: var(--muted);
  font-size: var(--fs-xs);
}
.footer-meta a { color: var(--muted); display: inline; padding: 0; }
.footer-meta a:hover { color: var(--ink); }

@media (max-width: 720px) {
  .footer-inner { grid-template-columns: 1fr 1fr; gap: var(--s-6); }
}

/* =========================================================================
   Utility helpers
   ========================================================================= */
.text-accent { color: var(--accent); }
.text-muted  { color: var(--muted); }
.text-center { text-align: center; }
.flex { display: flex; gap: var(--s-4); align-items: center; }
.flex-wrap { display: flex; gap: var(--s-3); flex-wrap: wrap; align-items: center; }
.grid { display: grid; gap: var(--s-6); }
.hidden { display: none !important; }
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

/* =========================================================================
   Reduced motion
   ========================================================================= */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}