/* ============================================================
   Zeroth — shared shell styles
   Used by: index.html, privacy.html, terms.html, schedule.html
   Page-specific styles stay inline in each page.
   ============================================================ */

:root{
  /* Surfaces */
  --c-bg:           #070A12;
  --c-bg-raised:    #0E121C;
  --c-bg-card:      rgba(17,22,34,0.6);
  --c-line:         rgba(255,255,255,0.08);
  --c-line-faint:   rgba(255,255,255,0.04);
  --c-line-strong:  rgba(255,255,255,0.16);

  /* Text */
  --c-text:         #F4F6FA;
  --c-text-muted:   rgba(244,246,250,0.64);
  --c-text-subtle:  rgba(244,246,250,0.44);

  /* Brand pair — Pulse Green is the ring (primary), Lime is the dot */
  --c-green-500:    #3DF5A6;
  --c-green-300:    #6CF7BD;
  --c-green-glow:   rgba(61,245,166,0.40);
  --c-lime-500:     #D4FF4A;
  --c-lime-glow:    rgba(212,255,74,0.75);
  --c-fg-on-accent: #04130B;

  /* Type */
  --font-display:   'Space Grotesk', ui-sans-serif, system-ui, sans-serif;
  --font-body:      'Geist', ui-sans-serif, system-ui, sans-serif;
  --font-mono:      'Geist Mono', ui-monospace, 'SF Mono', monospace;

  /* Motion */
  --ease-out:       cubic-bezier(0.22, 1, 0.36, 1);
  --d-micro:        120ms;
  --d-state:        220ms;
  --d-entrance:     480ms;

  /* Radii */
  --r-sm:           8px;
  --r-md:           12px;
  --r-lg:           16px;
  --r-xl:           24px;
  --r-full:         9999px;
}

*{ box-sizing: border-box; }
html, body{
  margin:0; padding:0;
  background:var(--c-bg);
  color:var(--c-text);
  font-family:var(--font-body);
  -webkit-font-smoothing: antialiased;
  overscroll-behavior-y: none;
}
body{
  font-size:16px;
  line-height:1.5;
  overflow-x:hidden;
  position: relative;
}
a{ color:inherit; text-decoration:none; }
button{ font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

::selection{ background: var(--c-green-500); color: var(--c-fg-on-accent); }

.mono{ font-family: var(--font-mono); font-weight:400; letter-spacing: 0.01em; }
.accent{ color: var(--c-green-500); }

/* ========= shell ========= */
.container{ width: min(1320px, 92vw); margin: 0 auto; position: relative; z-index: 1; }

/* ========= top nav ========= */
.nav{
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  padding: 18px 0;
  transition: backdrop-filter var(--d-state) var(--ease-out),
              background var(--d-state) var(--ease-out),
              border-color var(--d-state) var(--ease-out);
}
.nav.scrolled,
.nav.solid{
  background: rgba(7,10,18,0.6);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  border-bottom: 1px solid var(--c-line-faint);
}
.nav-row{ display:flex; align-items:center; justify-content:space-between; gap:24px; }
.brand{ display:flex; align-items:center; gap:10px; }
.brand-mark{ width: 22px; height: 22px; display:block; }
.brand-word{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.02em;
  color: var(--c-text);
}
.nav-links{ display:flex; align-items:center; gap: 28px; }
.nav-links a{ font-size: 14px; color: var(--c-text-muted); transition: color var(--d-state) var(--ease-out); }
.nav-links a:hover,
.nav-links a:focus-visible{ color: var(--c-text); outline: none; }

.nav-cta{
  display:inline-flex; align-items:center; gap: 8px;
  padding: 10px 16px; border-radius: var(--r-md);
  background: var(--c-green-500); color: var(--c-fg-on-accent);
  font-weight: 500; font-size: 14px;
  min-height: 40px;
  box-shadow: 0 0 0 1px var(--c-green-glow), 0 12px 32px -8px var(--c-green-glow);
  transition: background var(--d-state) var(--ease-out);
}
.nav-cta:hover{ background: var(--c-green-300); }
.nav-cta .arrow{ width:14px; height:14px; }

.nav-signin{
  font-size: .875rem;
  font-weight: 500;
  color: var(--c-text-muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--d-state) var(--ease-out);
}
.nav-signin:hover{ color: var(--c-text); }
.nav-signin-mobile{ display: none; }

/* mobile menu toggle (≤ 760px) */
.nav-toggle{
  display: none;
  align-items: center; justify-content: center;
  width: 40px; height: 40px;
  margin-left: 6px;
  border-radius: var(--r-md);
  border: 1px solid var(--c-line);
  background: var(--c-bg-raised);
  color: var(--c-text);
}
.nav-toggle:focus-visible{ outline: 2px solid var(--c-green-500); outline-offset: 2px; }
.nav-toggle svg{ width: 18px; height: 18px; }

@media (max-width: 760px){
  .nav-signin{ display: none; }
  .nav-signin-mobile{ display: block; }
  .nav-links{
    display: none;
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 6vw 16px;
    background: rgba(7,10,18,0.92);
    backdrop-filter: blur(20px) saturate(140%);
    -webkit-backdrop-filter: blur(20px) saturate(140%);
    border-bottom: 1px solid var(--c-line-faint);
  }
  .nav.open .nav-links{ display: flex; }
  .nav-links a{
    padding: 14px 4px;
    font-size: 15px;
    border-bottom: 1px solid var(--c-line-faint);
  }
  .nav-links a:last-child{ border-bottom: 0; }
  .nav-toggle{ display: inline-flex; }
}

/* ========= buttons ========= */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap: 10px;
  padding: 13px 20px;
  border-radius: var(--r-md);
  font-size: 14.5px; font-weight: 500;
  min-height: 44px;
  transition: background var(--d-state) var(--ease-out),
              border-color var(--d-state) var(--ease-out),
              color var(--d-state) var(--ease-out);
}
.btn-primary{
  background: var(--c-green-500); color: var(--c-fg-on-accent);
  box-shadow: 0 0 0 1px var(--c-green-glow), 0 12px 32px -8px var(--c-green-glow);
}
.btn-primary:hover{ background: var(--c-green-300); }
.btn-ghost{
  background: var(--c-bg-raised);
  border: 1px solid var(--c-line);
  color: var(--c-text);
}
.btn-ghost:hover{ border-color: var(--c-green-glow); }
.btn:focus-visible{ outline: 2px solid var(--c-green-500); outline-offset: 2px; }
.btn .arrow{ width:14px; height:14px; transition: transform var(--d-state) var(--ease-out); }
.btn:hover .arrow{ transform: translateX(2px); }

/* ========= eyebrow ========= */
.eyebrow{
  display:inline-flex; align-items:center; gap:10px;
  padding: 6px 12px 6px 10px;
  border-radius: var(--r-full);
  background: rgba(14,18,28,0.6);
  border: 1px solid var(--c-line);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-green-500);
  width: max-content;
}
.eyebrow .led{
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--c-lime-500);
  box-shadow: 0 0 0 3px rgba(212,255,74,0.18), 0 0 10px var(--c-lime-glow);
  animation: zeroth-pulse 1.6s var(--ease-out) infinite;
}
@keyframes zeroth-pulse{
  0%, 100%{ opacity: 0.55; }
  50%     { opacity: 1; }
}

/* ========= section primitives ========= */
section.block{ padding: 88px 0; position: relative; }

.section-head{
  display:flex;
  align-items:flex-end;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.section-tag{
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 11px;
  color: var(--c-green-500);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  display: flex; align-items: center; gap: 10px;
}
.section-tag::before{
  content:""; width: 28px; height: 1px; background: var(--c-green-500); display:inline-block;
}
.section-title{
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(36px, 4.6vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin: 16px 0 0;
  max-width: 18ch;
  text-wrap: balance;
}
.section-title .accent{ color: var(--c-green-500); }
.section-desc{
  max-width: 46ch;
  color: var(--c-text-muted);
  font-size: 17px;
  line-height: 1.6;
  text-wrap: pretty;
}

/* ========= chips ========= */
.chip{
  display:inline-flex; align-items:center; gap: 6px;
  padding: 5px 10px;
  border-radius: var(--r-full);
  border: 1px solid var(--c-line);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-text-muted);
}

/* ========= footer ========= */
footer{
  border-top: 1px solid var(--c-line-faint);
  padding: 36px 0;
  background: rgba(5,8,16,0.7);
  position: relative;
  z-index: 1;
}
.footer-row{
  display:flex; align-items:center; justify-content:space-between; gap: 20px;
  flex-wrap: wrap;
}
.footer-row .meta{
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-text-subtle);
  display:flex; gap: 24px; flex-wrap: wrap;
  letter-spacing: 0.06em;
}
.footer-row .meta a{
  border-bottom: 1px solid rgba(61,245,166,0.30);
  transition: border-color var(--d-state) var(--ease-out), color var(--d-state) var(--ease-out);
}
.footer-row .meta a:hover,
.footer-row .meta a:focus-visible{
  color: var(--c-text);
  border-bottom-color: var(--c-green-500);
  outline: none;
}

/* ========= reveal on scroll ========= */
.reveal{
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--d-entrance) var(--ease-out),
              transform var(--d-entrance) var(--ease-out);
}
.reveal.in{ opacity: 1; transform: none; }

/* ========= responsive — tablet (≤ 900px) ========= */
@media (max-width: 900px){
  section.block{ padding: 64px 0; }
  .section-head{
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 36px;
  }
  .section-head .section-desc{ max-width: none; }
}

/* ========= responsive — large phone (≤ 640px) ========= */
@media (max-width: 640px){
  section.block{ padding: 48px 0; }
  .section-head{ margin-bottom: 28px; }
  .section-desc{ font-size: 15px; }
  .footer-row{ flex-direction: column; align-items: flex-start; gap: 16px; }
}

/* ========= responsive — small phone (≤ 480px) ========= */
@media (max-width: 480px){
  .container{ width: 90vw; }
  .nav{ padding: 14px 0; }
  .nav-cta{ padding: 8px 12px; font-size: 13px; min-height: 36px; }
  .brand-word{ font-size: 18px; }
  section.block{ padding: 40px 0; }
  .section-title{ font-size: clamp(26px, 7.5vw, 36px); }
  .eyebrow{ font-size: 10px; padding: 5px 10px 5px 8px; gap: 8px; }
  .footer-row .meta{ gap: 12px; font-size: 11px; }
}

/* ========= reduced motion ========= */
@media (prefers-reduced-motion: reduce){
  *, *::before, *::after{
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .reveal{ opacity: 1; transform: none; }
}