/* ============================================================
   LONGEVITY TOTAL FITNESS — Design System
   "Built to last." Premium, editorial, enduring.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Archivo:ital,wght@0,400;0,500;0,600;0,700;0,800;0,900;1,500&family=Newsreader:ital,opsz,wght@1,6..72,400;1,6..72,500;0,6..72,400;0,6..72,500&display=swap');

:root{
  /* Brand */
  --green:        #008050;
  --green-bright: #11b070;
  --green-deep:   #0a5c3a;

  /* Neutrals — warm */
  --ink:        #11150f;   /* near-black, green-warm */
  --ink-2:      #0b130d;   /* deepest section bg */
  --forest:     #0e2419;   /* dark green tint panel */
  --paper:      #f5f3ed;   /* warm off-white */
  --paper-2:    #ece8de;   /* slightly deeper paper */
  --paper-3:    #e2ddd0;

  /* Semantic (light context defaults) */
  --bg:         var(--paper);
  --fg:         var(--ink);
  --muted:      #5d6359;
  --line:       rgba(17,21,15,.12);
  --accent:     var(--green);
  --accent-ink: #ffffff;

  /* Type */
  --sans: 'Archivo', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --serif: 'Newsreader', Georgia, 'Times New Roman', serif;

  /* Rhythm */
  --maxw: 1240px;
  --gutter: clamp(20px, 5vw, 64px);
  --radius: 4px;
  --section-y: clamp(72px, 11vw, 150px);

  /* Tweakable knobs (overridden by tweaks panel) */
  --tw-accent: var(--green);
  --tw-radius: 4px;
}

/* ---- Reset ---- */
*,*::before,*::after{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--sans);
  background:var(--bg);
  color:var(--fg);
  font-size:18px;
  line-height:1.6;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
button{ font-family:inherit; cursor:pointer; }
::selection{ background:var(--tw-accent); color:#fff; }

/* ---- Layout ---- */
.wrap{ max-width:var(--maxw); margin-inline:auto; padding-inline:var(--gutter); }
.section{ padding-block:var(--section-y); }
.section--tight{ padding-block:clamp(48px,7vw,90px); }

/* Dark context */
.dark{ background:var(--ink); color:var(--paper); --fg:var(--paper); --muted:rgba(245,243,237,.6); --line:rgba(245,243,237,.14); }
.dark.deepest{ background:var(--ink-2); }
.forest{ background:var(--forest); color:var(--paper); --fg:var(--paper); --muted:rgba(245,243,237,.62); --line:rgba(245,243,237,.16); }

/* ---- Typography ---- */
h1,h2,h3,h4{ margin:0; font-weight:800; line-height:1.02; letter-spacing:-.02em; }
.display{
  font-size:clamp(3rem, 9.5vw, 8.5rem);
  font-weight:900;
  line-height:.92;
  letter-spacing:-.035em;
  text-transform:uppercase;
}
.h1{ font-size:clamp(2.4rem,5.5vw,4.6rem); font-weight:900; line-height:.98; letter-spacing:-.03em; }
.h2{ font-size:clamp(1.9rem,4vw,3.3rem); font-weight:800; line-height:1.0; letter-spacing:-.025em; }
.h3{ font-size:clamp(1.3rem,2.2vw,1.9rem); font-weight:700; letter-spacing:-.015em; }
.lede{ font-size:clamp(1.15rem,1.8vw,1.5rem); line-height:1.5; font-weight:400; color:var(--fg); max-width:42ch; }
.serif-i{ font-family:var(--serif); font-style:italic; font-weight:400; letter-spacing:0; text-transform:none; }
.muted{ color:var(--muted); }

.eyebrow{
  font-size:.78rem; font-weight:700; letter-spacing:.28em; text-transform:uppercase;
  display:inline-flex; align-items:center; gap:.7em; color:var(--muted);
}
.eyebrow::before{ content:""; width:26px; height:1.5px; background:var(--tw-accent); display:inline-block; }
.eyebrow.center::before{ display:none; }

.accent{ color:var(--tw-accent); }

/* ---- Buttons ---- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:.6em;
  font-weight:700; font-size:.92rem; letter-spacing:.04em; text-transform:uppercase;
  padding:1.05em 1.9em; border:1.5px solid transparent; border-radius:var(--tw-radius);
  transition:transform .25s cubic-bezier(.2,.8,.2,1), background .25s, color .25s, border-color .25s;
  white-space:nowrap;
}
.btn:active{ transform:translateY(1px); }
.btn--accent{ background:var(--tw-accent); color:#fff; }
.btn--accent:hover{ background:var(--green-bright); }
.btn--ink{ background:var(--ink); color:var(--paper); }
.btn--ink:hover{ background:var(--green); }
.btn--ghost{ background:transparent; border-color:currentColor; color:inherit; }
.btn--ghost:hover{ background:currentColor; }
.btn--ghost:hover span{ color:var(--bg); }
.btn .arrow{ transition:transform .3s cubic-bezier(.2,.8,.2,1); }
.btn:hover .arrow{ transform:translateX(4px); }

/* ---- Header / Nav ---- */
.nav{
  position:fixed; inset:0 0 auto 0; z-index:100;
  display:flex; align-items:center; justify-content:space-between;
  padding:18px var(--gutter);
  transition:background .4s, padding .4s, box-shadow .4s, border-color .4s;
  border-bottom:1px solid transparent;
}
.nav.scrolled{
  background:color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter:saturate(1.4) blur(18px);
  -webkit-backdrop-filter:saturate(1.4) blur(18px);
  border-bottom-color:var(--line);
  padding-block:12px;
}
.nav__logo img{ height:34px; width:auto; transition:height .4s; }
.nav.scrolled .nav__logo img{ height:30px; }
.nav__links{ display:flex; align-items:center; gap:clamp(20px,2.5vw,44px); list-style:none; margin:0; padding:0; }
.nav__links a{
  font-size:.82rem; font-weight:700; letter-spacing:.16em; text-transform:uppercase;
  color:var(--paper); position:relative; padding-block:6px; transition:color .25s;
  text-shadow:0 1px 14px rgba(0,0,0,.4);
}
.nav__links a::after{
  content:""; position:absolute; left:0; bottom:0; width:0; height:2px; background:var(--tw-accent); transition:width .3s cubic-bezier(.2,.8,.2,1);
}
.nav__links a:hover::after, .nav__links a.active::after{ width:100%; }
.nav.scrolled .nav__links a{ color:var(--ink); text-shadow:none; }
.nav__right{ display:flex; align-items:center; gap:18px; }
.nav__cta{ font-size:.8rem; }
.nav.scrolled .nav__cta.btn--ghost{ color:var(--ink); }

/* logo swap based on nav state */
.nav__logo .logo-ink{ display:none; }
.nav.scrolled .nav__logo .logo-white{ display:none; }
.nav.scrolled .nav__logo .logo-ink{ display:block; }

/* Hamburger */
.burger{ display:none; flex-direction:column; gap:5px; background:none; border:0; padding:8px; }
.burger span{ width:24px; height:2px; background:var(--paper); transition:.3s; }
.nav.scrolled .burger span{ background:var(--ink); }

/* Mobile drawer */
.drawer{
  position:fixed; inset:0; z-index:99; background:var(--ink); color:var(--paper);
  display:flex; flex-direction:column; justify-content:center; padding:var(--gutter);
  transform:translateY(-100%); transition:transform .5s cubic-bezier(.7,0,.2,1); visibility:hidden;
}
.drawer.open{ transform:translateY(0); visibility:visible; }
.drawer a{ font-size:clamp(2rem,9vw,3.4rem); font-weight:900; text-transform:uppercase; letter-spacing:-.02em; padding:.18em 0; border-bottom:1px solid rgba(255,255,255,.12); display:flex; justify-content:space-between; align-items:center; }
.drawer a:last-of-type{ border-bottom:0; }
.drawer a .idx{ font-size:.9rem; font-weight:600; color:var(--green-bright); letter-spacing:.1em; }
.drawer__foot{ margin-top:auto; padding-top:32px; color:rgba(245,243,237,.6); font-size:.95rem; display:flex; flex-wrap:wrap; gap:8px 28px; }

/* ---- Footer ---- */
.footer{ background:var(--ink-2); color:var(--paper); padding-block:clamp(60px,8vw,100px) 36px; }
.footer a{ color:rgba(245,243,237,.72); transition:color .2s; }
.footer a:hover{ color:var(--green-bright); }
.footer__grid{ display:grid; grid-template-columns:1.6fr 1fr 1fr 1.2fr; gap:48px 40px; }
.footer__col h4{ font-size:.78rem; letter-spacing:.2em; text-transform:uppercase; color:rgba(245,243,237,.5); margin-bottom:18px; font-weight:700; }
.footer__col ul{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:11px; font-size:1rem; }
.footer__logo img{ height:40px; margin-bottom:20px; }
.footer__bottom{ border-top:1px solid rgba(245,243,237,.12); margin-top:56px; padding-top:24px; display:flex; justify-content:space-between; flex-wrap:wrap; gap:14px; font-size:.85rem; color:rgba(245,243,237,.5); }

/* ---- Image placeholder ---- */
.ph{
  position:relative; overflow:hidden; background:var(--paper-2);
  background-image:repeating-linear-gradient(135deg, rgba(0,128,80,.05) 0 12px, transparent 12px 24px);
  display:flex; align-items:flex-end; color:var(--muted);
}
.ph.dark{ background:#1a201a; background-image:repeating-linear-gradient(135deg, rgba(255,255,255,.04) 0 12px, transparent 12px 24px); }
.ph::after{
  content:attr(data-label); font-family:ui-monospace,'SF Mono',Menlo,monospace;
  font-size:.72rem; letter-spacing:.05em; padding:12px 14px; color:var(--muted); text-transform:uppercase;
}
.ph img{ position:absolute; inset:0; width:100%; height:100%; object-fit:cover; }

/* ---- Reveal animation ---- */
.reveal{ opacity:0; transform:translateY(26px); transition:opacity .9s cubic-bezier(.2,.8,.2,1), transform .9s cubic-bezier(.2,.8,.2,1); }
.reveal.in{ opacity:1; transform:none; }
.reveal.d1{ transition-delay:.08s; } .reveal.d2{ transition-delay:.16s; } .reveal.d3{ transition-delay:.24s; } .reveal.d4{ transition-delay:.32s; }
@media (prefers-reduced-motion: reduce){
  .reveal{ opacity:1 !important; transform:none !important; }
  html{ scroll-behavior:auto; }
}

/* ---- Utilities ---- */
.stack{ display:flex; flex-direction:column; }
.row{ display:flex; }
.center{ text-align:center; }
.grid{ display:grid; }
.mt-s{ margin-top:14px; } .mt-m{ margin-top:26px; } .mt-l{ margin-top:44px; }
.btn-row{ display:flex; gap:14px; flex-wrap:wrap; }
.divider{ height:1px; background:var(--line); border:0; }

/* ---- Shared layout blocks (used across pages) ---- */
.split{ display:grid; grid-template-columns:1.05fr .95fr; gap:clamp(36px,6vw,90px); align-items:center; }
.concept__def{ border-radius:var(--tw-radius); overflow:hidden; box-shadow:0 30px 70px -40px rgba(17,21,15,.5); }
.concept__def img{ width:100%; }
.pron{ font-family:var(--serif); font-style:italic; font-size:clamp(1.4rem,2.4vw,2rem); color:var(--green); }
.feature__media{ position:relative; border-radius:var(--tw-radius); overflow:hidden; aspect-ratio:4/5; }
.feature__media img{ width:100%; height:100%; object-fit:cover; }
.amen{ list-style:none; margin:26px 0 0; padding:0; display:grid; grid-template-columns:1fr 1fr; gap:14px 28px; }
.amen li{ display:flex; align-items:flex-start; gap:12px; font-size:1rem; }
.amen li::before{ content:""; flex:none; width:8px; height:8px; margin-top:8px; background:var(--tw-accent); border-radius:1px; transform:rotate(45deg); }
.principles{ display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line); border-block:1px solid var(--line); }
.principle{ background:var(--bg); padding:clamp(28px,3.5vw,46px) clamp(22px,2.6vw,34px); }
.principle .n{ font-family:var(--serif); font-style:italic; color:var(--tw-accent); font-size:1.3rem; }
.principle h3{ margin-top:14px; }
.principle p{ margin:12px 0 0; color:var(--muted); font-size:1rem; }

/* ---- Responsive ---- */
@media (max-width:900px){
  .nav__links, .nav__cta{ display:none; }
  .burger{ display:flex; }
  .footer__grid{ grid-template-columns:1fr 1fr; }
}
@media (max-width:860px){
  .split{ grid-template-columns:1fr; }
  .principles{ grid-template-columns:1fr; }
}
@media (max-width:560px){
  body{ font-size:16px; }
  .footer__grid{ grid-template-columns:1fr; gap:34px; }
  .amen{ grid-template-columns:1fr; }
}