/* Praxis Landing — Apple-minimal dark (OLED) tokens */
:root{
  --bg:#000000;
  --surface:#0a0a0c;
  --card:#121214;
  --border:rgba(255,255,255,0.12);
  --text:#f5f5f7;
  --muted:#86868b;
  --muted-strong:#6e6e73;
  --accent:#2997ff;
  --accent-hover:#1d8aff;
  --accent-focus:rgba(41,151,255,0.3);
  --btn-primary:#6366f1;
  --btn-primary-hover:#4f46e5;
  --btn-primary-focus:rgba(99,102,241,0.3);
  --radius-sm:8px;
  --radius-md:12px;
  --radius-lg:14px;
  --radius-pill:22px;
  --shadow-soft:0 4px 16px rgba(0,0,0,0.4);
  --shadow-card:0 8px 32px rgba(0,0,0,0.5);
  --transition-fast:120ms ease;
  --transition-base:200ms ease;
  --transition-slow:400ms ease;
}

@media (prefers-color-scheme: light) {
  :root{
    --bg:#f5f5f7;
    --surface:#fff;
    --card:#fff;
    --border:rgba(0,0,0,0.12);
    --text:#1d1d1f;
    --muted:#86868b;
    --muted-strong:#6e6e73;
  }
}

*, *::before, *::after{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion: reduce){
  *, *::before, *::after{animation-duration:0.01ms!important;transition-duration:0.01ms!important}
  html{scroll-behavior:auto}
}

body{
  margin:0;
  min-height:100vh;
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
}

img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none;transition:color var(--transition-fast)}
a:hover{color:var(--accent-hover)}
a:focus-visible{outline:2px solid var(--accent-focus);outline-offset:2px;border-radius:2px}

.wrap{max-width:1120px;margin:0 auto;padding:0 24px;width:100%}

/* ===== NAV ===== */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:56px;
  background:rgba(0,0,0,0.72);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid var(--border);
}
.nav__inner{max-width:1120px;margin:0 auto;padding:0 24px;height:100%;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:600;font-size:15px;letter-spacing:-0.01em}
.brand__mark{width:28px;height:28px;flex-shrink:0}
.nav__links{display:flex;align-items:center;gap:8px}
.nav__links a{padding:8px 14px;border-radius:var(--radius-pill);font-size:13px;font-weight:500;color:var(--muted);transition:color var(--transition-fast),background var(--transition-fast)}
.nav__links a:hover{color:var(--text);background:rgba(255,255,255,0.06)}
@media (prefers-color-scheme: light){
  .nav{background:rgba(245,245,247,0.88);border-bottom:1px solid var(--border)}
  .nav__links a:hover{background:rgba(0,0,0,0.04)}
}

/* ===== BUTTONS ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 24px;font-size:15px;font-weight:600;border-radius:var(--radius-pill);border:none;cursor:pointer;transition:opacity var(--transition-fast),transform var(--transition-fast),background var(--transition-fast),box-shadow var(--transition-fast);text-decoration:none;white-space:nowrap}
.btn:focus-visible{outline:2px solid var(--btn-primary-focus);outline-offset:2px}
.btn:active{transform:scale(0.98)}
.btn:disabled{opacity:0.5;cursor:not-allowed;transform:none}
.btn--primary{background:var(--btn-primary);color:#fff;box-shadow:0 4px 14px rgba(99,102,241,0.35)}
.btn--primary:hover{background:var(--btn-primary-hover);opacity:1}
.btn--nav-install{background:var(--accent);color:var(--text);box-shadow:0 4px 14px rgba(41,151,255,0.35)}
.btn--nav-install:hover{background:var(--accent-hover);color:var(--text);opacity:1}
.btn--ghost{background:transparent;color:var(--text);border:1px solid var(--border)}
.btn--ghost:hover{background:rgba(255,255,255,0.06);border-color:rgba(255,255,255,0.2);color:var(--text)}
@media (prefers-color-scheme: light){
  .btn--ghost{border-color:var(--border);color:var(--text)}
  .btn--ghost:hover{background:rgba(0,0,0,0.04);border-color:rgba(0,0,0,0.15)}
  .btn--nav-install{background:var(--accent);color:var(--text)}
  .btn--nav-install:hover{background:var(--accent-hover);color:var(--text)}
}
.btn--large{height:52px;padding:0 32px;font-size:16px}

/* ===== HERO ===== */
.hero{padding:140px 0 80px;text-align:center}
.eyebrow{display:inline-block;font-size:12px;font-weight:600;letter-spacing:0.14em;text-transform:uppercase;color:var(--muted);margin-bottom:16px}
.hero__title{font-size:clamp(32px,5.5vw,60px);font-weight:600;letter-spacing:-0.035em;line-height:1.04;margin:0 0 20px;max-width:900px;margin-left:auto;margin-right:auto}
.hero__sub{font-size:clamp(17px,2.2vw,20px);color:var(--muted);max-width:640px;margin:0 auto 32px;line-height:1.55}
.hero__cta{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-bottom:24px}
.hero__meta{font-size:13px;color:var(--muted-strong)}
.hero__meta a{color:var(--muted-strong);text-decoration:underline}
.hero__meta a:hover{color:var(--accent);text-decoration:none}

/* ===== SECTIONS ===== */
.section{padding:80px 0}
.section--alt{background:var(--surface)}
.section-title{font-size:clamp(28px,4vw,40px);font-weight:600;letter-spacing:-0.03em;line-height:1.1;margin:0 0 12px}
.section-lede{font-size:18px;color:var(--muted);max-width:680px;margin:0 0 48px;line-height:1.6}

/* ===== EXTENSION PREVIEW ===== */
.preview-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px;margin-top:16px}
.preview-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;transition:transform var(--transition-base),border-color var(--transition-base),box-shadow var(--transition-base)}
.preview-card:hover{transform:translateY(-4px);border-color:rgba(255,255,255,0.18);box-shadow:var(--shadow-card)}
.preview__label{padding:14px 20px;background:rgba(255,255,255,0.03);border-bottom:1px solid var(--border);font-size:12px;font-weight:600;letter-spacing:0.09em;text-transform:uppercase;color:var(--muted)}
.preview__frame{aspect-ratio:420/500;background:var(--surface);display:flex;align-items:center;justify-content:center;padding:16px}
.preview__illustration{width:100%;height:100%;max-width:420px;max-height:500px}

/* ===== HOW IT WORKS STEPS ===== */
.steps-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px}
.step-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:32px 24px;transition:border-color var(--transition-base)}
.step-card:hover{border-color:rgba(255,255,255,0.18)}
.step__number{font-size:12px;font-weight:600;letter-spacing:0.14em;text-transform:uppercase;color:var(--accent);margin-bottom:12px}
.step__title{font-size:18px;font-weight:600;letter-spacing:-0.01em;margin:0 0 10px;color:var(--text)}
.step__desc{font-size:15px;color:var(--muted);margin:0;line-height:1.6}

/* ===== COMPARISON TABLE ===== */
.comparison{width:100%;border-collapse:collapse;font-size:14px;margin-top:8px;overflow-x:auto;display:block}
.comparison th,.comparison td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--border);vertical-align:top}
.comparison th{font-weight:600;color:var(--text);font-size:13px;white-space:nowrap}
.comparison th:first-child{width:160px;position:sticky;left:0;background:var(--card);z-index:1}
.comparison td{color:var(--muted);line-height:1.5}
.comparison tbody tr:last-child td{border-bottom:none}
.comparison tbody tr:hover td{background:rgba(255,255,255,0.02)}
.comparison--highlight{background:rgba(41,151,255,0.06);border-left:3px solid var(--accent)}
.comparison--highlight strong{color:var(--accent)}

/* ===== USE CASES ===== */
.use-cases{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px;margin-top:8px}
.use-case{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:32px 24px;transition:border-color var(--transition-base),transform var(--transition-base)}
.use-case:hover{border-color:rgba(255,255,255,0.18);transform:translateY(-2px)}
.use-case__icon{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:rgba(41,151,255,0.12);border-radius:var(--radius-md);color:var(--accent);margin-bottom:16px;flex-shrink:0}
.use-case__title{font-size:18px;font-weight:600;margin:0 0 10px}
.use-case__desc{font-size:15px;color:var(--muted);margin:0;line-height:1.6}

/* ===== FAQ ===== */
.faq{margin-top:8px}
.faq__item{border-bottom:1px solid var(--border)}
.faq__item:last-child{border-bottom:none}
.faq__btn{width:100%;text-align:left;background:none;border:none;padding:20px 0;font-size:17px;font-weight:500;color:var(--text);cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:16px;font-family:inherit;line-height:1.4}
.faq__btn::after{content:'';width:24px;height:24px;display:flex;align-items:center;justify-content:center;background:rgba(255,255,255,0.06);border-radius:50%;transition:transform var(--transition-base),background var(--transition-fast)}
.faq__btn::before{content:'+';font-size:20px;font-weight:300;color:var(--muted);line-height:1;display:block}
.faq__btn[aria-expanded="true"]::before{content:'−'}
.faq__btn[aria-expanded="true"]::after{transform:rotate(180deg);background:rgba(41,151,255,0.15)}
.faq__btn:hover::after{background:rgba(255,255,255,0.1)}
.faq__a{max-height:0;overflow:hidden;transition:max-height var(--transition-slow),padding var(--transition-base),opacity var(--transition-base);opacity:0;padding:0 0 0 2px;font-size:16px;color:var(--muted);line-height:1.7}
.faq__a.open{max-height:500px;opacity:1;padding-bottom:20px}
.faq__a a{font-weight:500}

/* ===== CTA SECTION ===== */
.section--cta{text-align:center;padding:100px 0;background:linear-gradient(180deg,transparent,rgba(41,151,255,0.03))}

/* ===== FOOTER ===== */
.footer{padding:40px 0;border-top:1px solid var(--border);background:var(--surface)}
.footer__inner{display:flex;flex-direction:column;align-items:center;gap:16px;text-align:center}
.footer__copy{font-size:13px;color:var(--muted-strong);margin:0}
.footer__nav{display:flex;gap:24px;flex-wrap:wrap;justify-content:center}
.footer__nav a{font-size:13px;color:var(--muted-strong);transition:color var(--transition-fast)}
.footer__nav a:hover{color:var(--accent)}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce){
  .preview-card,.step-card,.use-case,.faq__a,.faq__btn::after{transition:none}
}