/* ================================================================
   DR. AMAN KHANNA — ORTHOPAEDIC · shared site chrome
   Dark clinical-tech system. Tokens/reset/type/header/mobile-menu/
   footer/buttons/section-common + subpage components (page-hero,
   cards, prose/blog, FAQ, breadcrumbs, locality blocks, CTA, FAB).
   The animated HOME page keeps its own scene CSS inline; every page
   links THIS file. All shared URLs are root-absolute (/assets/...).
   ================================================================ */

:root{
  --bg-primary:#0A0A0F; --bg-section:#111118; --bg-surface:#1A1A24;
  --accent:#00E5A0; --accent-warm:#C8FF00;
  --text-primary:#F0F0F5; --text-secondary:#8888A0; --text-ghost:#2A2A3A;
  --divider:#2A2A3A;
  --font-display:'Space Grotesk',sans-serif;
  --font-body:'Inter',sans-serif;
  --font-mono:'JetBrains Mono',monospace;
  --header-height:72px; --section-pad:clamp(72px,10vh,130px);
  --container:1400px; --ease:cubic-bezier(.16,1,.3,1);
}

*,*::before,*::after{ box-sizing:border-box; margin:0; padding:0; }
html{ -webkit-font-smoothing:antialiased; -moz-osx-font-smoothing:grayscale; scroll-behavior:smooth; }
html,body{ overflow-x:clip; }
body{ font-family:var(--font-body); background:var(--bg-primary); color:var(--text-primary); line-height:1.65; }
img,svg{ display:block; max-width:100%; }
a{ color:inherit; text-decoration:none; }
button{ font:inherit; cursor:pointer; border:none; background:none; color:inherit; }
ul,ol{ list-style:none; }
::selection{ background:var(--accent); color:var(--bg-primary); }
:focus-visible{ outline:2px solid var(--accent); outline-offset:3px; border-radius:3px; }
.visually-hidden{ position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap; border:0; }

/* ---------------- Typography ---------------- */
h1,h2,h3,h4{ font-family:var(--font-display); font-weight:700; line-height:1.05; letter-spacing:-.03em; }
h1{ font-size:clamp(2.2rem,5vw,4.2rem); }
h2{ font-size:clamp(1.9rem,4vw,3.2rem); }
h3{ font-size:clamp(1.4rem,2vw,1.9rem); letter-spacing:-.02em; }
h4{ font-size:clamp(1.15rem,1.5vw,1.4rem); letter-spacing:-.01em; }
p{ color:var(--text-secondary); }
.t-body{ font-weight:300; font-size:clamp(.98rem,1.1vw,1.12rem); line-height:1.75; color:var(--text-secondary); }
.lede{ font-weight:300; font-size:clamp(1.05rem,1.4vw,1.3rem); line-height:1.7; color:var(--text-secondary); max-width:60ch; }
.section-label{ font-family:var(--font-mono); font-size:.72rem; letter-spacing:.18em; text-transform:uppercase; color:var(--accent); margin-bottom:20px; display:block; }
.section-title{ font-size:clamp(2rem,4.5vw,3.6rem); line-height:1.05; margin-bottom:clamp(28px,4vh,52px); }
.accent{ color:var(--accent); }

/* ---------------- Layout ---------------- */
.section-inner{ max-width:var(--container); margin:0 auto; padding:0 clamp(20px,4vw,48px); }
.sec{ padding:var(--section-pad) 0; }
.bg-section{ background:var(--bg-section); }
.bg-surface{ background:var(--bg-surface); }
.divider-top{ border-top:1px solid var(--divider); }

/* ---------------- Buttons ---------------- */
.btn{ display:inline-flex; align-items:center; justify-content:center; gap:10px;
  font-family:var(--font-display); font-weight:600; font-size:.95rem; letter-spacing:.03em;
  padding:15px 34px; border-radius:100px; transition:transform .3s var(--ease), box-shadow .3s var(--ease), background .3s, color .3s, border-color .3s; }
.btn-primary{ background:var(--accent); color:var(--bg-primary); }
.btn-primary:hover{ transform:translateY(-2px); box-shadow:0 10px 34px rgba(0,229,160,.3); }
.btn-ghost{ border:1px solid var(--divider); color:var(--text-primary); }
.btn-ghost:hover{ border-color:var(--accent); color:var(--accent); transform:translateY(-2px); }
.btn svg{ width:17px; height:17px; }
.btn-row{ display:flex; gap:14px; flex-wrap:wrap; align-items:center; }

/* ---------------- Header / Nav ---------------- */
.site-header{ position:fixed; inset:0 0 auto 0; height:var(--header-height); z-index:100; transition:background .4s, backdrop-filter .4s, box-shadow .4s; }
.site-header.scrolled{ background:rgba(10,10,15,.82); backdrop-filter:blur(20px) saturate(140%); -webkit-backdrop-filter:blur(20px) saturate(140%); box-shadow:0 1px 0 rgba(255,255,255,.05); }
.header-inner{ max-width:var(--container); margin:0 auto; height:100%; display:flex; align-items:center; justify-content:space-between; padding:0 clamp(20px,4vw,48px); }
.logo-link{ display:flex; align-items:center; gap:12px; }
.logo-mark{ width:34px; height:34px; color:var(--accent); flex:0 0 auto; }
.logo-text{ font-family:var(--font-display); font-weight:700; font-size:.86rem; letter-spacing:.12em; text-transform:uppercase; white-space:nowrap; }
.logo-text small{ display:block; font-family:var(--font-mono); font-weight:400; font-size:.6rem; letter-spacing:.22em; color:var(--text-secondary); margin-top:2px; }
.header-right{ display:flex; align-items:center; gap:clamp(18px,2vw,30px); }
.header-nav{ display:flex; align-items:center; gap:clamp(18px,2vw,32px); }
.header-nav a{ font-size:.88rem; color:var(--text-secondary); letter-spacing:.02em; transition:color .3s; position:relative; }
.header-nav a:hover, .header-nav a.is-active{ color:var(--text-primary); }
.header-nav a.is-active::after{ content:""; position:absolute; left:0; right:0; bottom:-6px; height:1px; background:var(--accent); }
.header-cta{ font-family:var(--font-display); font-size:.8rem; font-weight:600; letter-spacing:.05em; padding:10px 22px; border:1px solid var(--accent); border-radius:100px; color:var(--accent); transition:background .3s, color .3s; white-space:nowrap; }
.header-cta:hover{ background:var(--accent); color:var(--bg-primary); }
.menu-toggle{ display:none; width:32px; height:22px; flex-direction:column; justify-content:space-between; align-items:flex-end; }
.menu-toggle span{ display:block; height:1.5px; background:var(--text-primary); transition:all .3s var(--ease); }
.menu-toggle span:nth-child(1){ width:100%; } .menu-toggle span:nth-child(2){ width:70%; } .menu-toggle span:nth-child(3){ width:85%; }
.menu-toggle.open span:nth-child(1){ transform:rotate(45deg) translate(5px,7px); }
.menu-toggle.open span:nth-child(2){ opacity:0; }
.menu-toggle.open span:nth-child(3){ width:100%; transform:rotate(-45deg) translate(5px,-7px); }
@media(max-width:900px){ .header-nav, .header-cta{ display:none; } .menu-toggle{ display:flex; } }

.menu-overlay{ position:fixed; inset:0; z-index:99; background:var(--bg-primary); display:flex; flex-direction:column; justify-content:center; padding:clamp(40px,8vw,80px);
  clip-path:circle(0% at calc(100% - 40px) 36px); transition:clip-path .7s cubic-bezier(.65,0,.35,1); pointer-events:none; overflow-y:auto; }
.menu-overlay.open{ clip-path:circle(150% at calc(100% - 40px) 36px); pointer-events:all; }
.menu-overlay nav{ display:flex; flex-direction:column; gap:14px; margin-bottom:36px; }
.menu-overlay nav a{ font-family:var(--font-display); font-weight:700; font-size:clamp(1.6rem,5vw,2.6rem); letter-spacing:-.02em; color:var(--text-secondary); transition:color .3s, transform .3s; }
.menu-overlay nav a:hover, .menu-overlay nav a.is-active{ color:var(--accent); transform:translateX(14px); }
.menu-overlay .overlay-label{ font-family:var(--font-mono); font-size:.7rem; letter-spacing:.18em; text-transform:uppercase; color:var(--text-ghost); margin-top:10px; }
.menu-overlay .overlay-cta{ align-self:flex-start; font-family:var(--font-display); font-weight:600; font-size:1rem; padding:15px 38px; border:1px solid var(--accent); border-radius:100px; color:var(--accent); transition:background .3s,color .3s; }
.menu-overlay .overlay-cta:hover{ background:var(--accent); color:var(--bg-primary); }

/* ---------------- Page hero (subpages) ---------------- */
.page-hero{ position:relative; padding:calc(var(--header-height) + clamp(48px,9vh,96px)) 0 clamp(40px,6vh,72px); overflow:hidden; }
.page-hero::before{ content:""; position:absolute; inset:0; background:radial-gradient(60% 80% at 78% -10%, rgba(0,229,160,.08), transparent 60%); pointer-events:none; }
.page-hero::after{ content:""; position:absolute; inset:0; background-image:linear-gradient(rgba(42,42,58,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(42,42,58,.045) 1px,transparent 1px); background-size:60px 60px; mask-image:radial-gradient(70% 60% at 50% 30%,#000,transparent 80%); pointer-events:none; }
.page-hero .section-inner{ position:relative; z-index:1; }
.page-hero h1{ max-width:20ch; margin-bottom:.4em; }
.page-hero .lede{ max-width:62ch; }
.breadcrumb{ font-family:var(--font-mono); font-size:.72rem; letter-spacing:.1em; text-transform:uppercase; color:var(--text-secondary); margin-bottom:22px; }
.breadcrumb a{ color:var(--text-secondary); transition:color .3s; }
.breadcrumb a:hover{ color:var(--accent); }
.breadcrumb span{ color:var(--text-ghost); margin:0 .5em; }

/* ---------------- Cards ---------------- */
.card-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(280px,1fr)); gap:clamp(18px,2.4vw,28px); }
.card{ background:var(--bg-surface); border:1px solid var(--divider); border-radius:16px; padding:clamp(26px,3vw,38px); transition:border-color .4s, transform .3s, box-shadow .4s; display:flex; flex-direction:column; height:100%; }
a.card{ color:inherit; }
.card:hover{ border-color:var(--accent); transform:translateY(-4px); box-shadow:0 0 40px rgba(0,229,160,.07), 0 20px 50px rgba(0,0,0,.35); }
.card-ic{ width:48px; height:48px; border-radius:12px; margin-bottom:22px; display:flex; align-items:center; justify-content:center; background:rgba(0,229,160,.1); color:var(--accent); }
.card-ic svg{ width:26px; height:26px; }
.card-num{ font-family:var(--font-mono); font-size:.7rem; letter-spacing:.15em; color:var(--accent); margin-bottom:14px; }
.card h3{ margin-bottom:.5em; }
.card p{ font-weight:300; font-size:.96rem; line-height:1.6; flex-grow:1; }
.card-link{ margin-top:20px; font-family:var(--font-display); font-size:.85rem; font-weight:600; color:var(--accent); display:inline-flex; align-items:center; gap:8px; transition:gap .3s; }
.card:hover .card-link{ gap:14px; }
.card-link svg{ width:15px; height:15px; }
.card-tag{ align-self:flex-start; font-family:var(--font-mono); font-size:.62rem; letter-spacing:.12em; text-transform:uppercase; color:var(--accent-warm); border:1px solid var(--divider); border-radius:100px; padding:.4em .8em; margin-bottom:16px; }

/* ---------------- Split / feature ---------------- */
.split{ display:grid; grid-template-columns:1fr 1fr; gap:clamp(28px,5vw,72px); align-items:center; }
.split-media img{ width:100%; border-radius:18px; aspect-ratio:4/5; object-fit:cover; object-position:50% 18%; border:1px solid var(--divider); }
@media(max-width:820px){ .split{ grid-template-columns:1fr; } .split-media{ max-width:400px; margin:0 auto; } }

/* ticks + chips */
.ticks{ display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr)); gap:.6em 1.6em; margin-top:1.2em; }
.ticks li{ position:relative; padding-left:1.7em; color:var(--text-secondary); font-weight:300; }
.ticks li::before{ content:""; position:absolute; left:0; top:.4em; width:12px; height:8px; border-left:2px solid var(--accent); border-bottom:2px solid var(--accent); transform:rotate(-45deg); }
.chips{ display:flex; flex-wrap:wrap; gap:.7em; }
.chip{ font-size:.9rem; font-weight:300; color:var(--text-primary); background:var(--bg-surface); border:1px solid var(--divider); border-radius:100px; padding:.65em 1.1em; }

/* ---------------- Prose (blog article) ---------------- */
.prose{ max-width:760px; margin:0 auto; }
.prose > *{ margin-bottom:1.3em; }
.prose h2{ font-size:clamp(1.6rem,2.6vw,2.2rem); margin-top:1.6em; margin-bottom:.5em; }
.prose h3{ margin-top:1.4em; margin-bottom:.4em; }
.prose p, .prose li{ font-weight:300; font-size:1.08rem; line-height:1.8; color:var(--text-secondary); }
.prose ul, .prose ol{ padding-left:1.3em; }
.prose ul li{ list-style:disc; margin-bottom:.5em; } .prose ol li{ list-style:decimal; margin-bottom:.5em; }
.prose a{ color:var(--accent); border-bottom:1px solid rgba(0,229,160,.3); }
.prose strong{ color:var(--text-primary); font-weight:600; }
.prose blockquote{ border-left:2px solid var(--accent); padding-left:1.2em; font-style:italic; color:var(--text-primary); }
.prose img{ border-radius:12px; border:1px solid var(--divider); }
.article-meta{ font-family:var(--font-mono); font-size:.75rem; letter-spacing:.08em; color:var(--text-secondary); display:flex; gap:1.2em; flex-wrap:wrap; margin-bottom:1.5em; }
.article-meta .accent{ color:var(--accent); }

/* blog index cards */
.post-card{ display:flex; flex-direction:column; background:var(--bg-surface); border:1px solid var(--divider); border-radius:16px; overflow:hidden; transition:border-color .4s, transform .3s; height:100%; }
.post-card:hover{ border-color:var(--accent); transform:translateY(-4px); }
.post-card-body{ padding:clamp(22px,2.5vw,30px); display:flex; flex-direction:column; height:100%; }
.post-card .cat{ font-family:var(--font-mono); font-size:.66rem; letter-spacing:.12em; text-transform:uppercase; color:var(--accent); margin-bottom:12px; }
.post-card h3{ font-size:1.25rem; margin-bottom:.5em; }
.post-card p{ font-weight:300; font-size:.95rem; flex-grow:1; }
.post-card .card-link{ margin-top:16px; }

/* ---------------- FAQ accordion ---------------- */
.faq-list{ max-width:820px; margin:0 auto; }
.faq-q{ border-top:1px solid var(--divider); }
.faq-q:last-child{ border-bottom:1px solid var(--divider); }
.faq-q summary{ list-style:none; cursor:pointer; padding:1.5rem 3rem 1.5rem 0; position:relative; font-family:var(--font-display); font-weight:600; font-size:clamp(1.05rem,1.6vw,1.3rem); color:var(--text-primary); }
.faq-q summary::-webkit-details-marker{ display:none; }
.faq-q summary::after{ content:"+"; position:absolute; right:8px; top:1.35rem; font-size:1.5rem; color:var(--accent); transition:transform .3s var(--ease); line-height:1; }
.faq-q[open] summary::after{ transform:rotate(45deg); }
.faq-q .faq-a{ padding:0 2.5rem 1.6rem 0; }
.faq-q .faq-a p{ font-weight:300; line-height:1.75; } .faq-q .faq-a p+p{ margin-top:.8em; }

/* ---------------- Locality blocks ---------------- */
.info-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(240px,1fr)); gap:clamp(16px,2vw,24px); }
.info-card{ background:var(--bg-surface); border:1px solid var(--divider); border-radius:14px; padding:clamp(20px,2.5vw,28px); }
.info-card h4{ display:flex; align-items:center; gap:.55em; margin-bottom:.6em; }
.info-card h4 svg{ width:20px; height:20px; color:var(--accent); flex:0 0 auto; }
.info-card p, .info-card address{ font-style:normal; font-weight:300; color:var(--text-secondary); line-height:1.7; }
.info-card a{ color:var(--accent); }
.nearby{ display:flex; flex-wrap:wrap; gap:.6em; }
.nearby a{ font-size:.85rem; color:var(--text-secondary); border:1px solid var(--divider); border-radius:100px; padding:.55em 1em; transition:border-color .3s,color .3s; }
.nearby a:hover{ border-color:var(--accent); color:var(--accent); }

/* ---------------- CTA band ---------------- */
.cta-band{ text-align:center; position:relative; overflow:hidden; }
.cta-band::before{ content:""; position:absolute; top:50%; left:50%; transform:translate(-50%,-50%); width:600px; height:600px; border-radius:50%; background:radial-gradient(circle,rgba(0,229,160,.07),transparent 70%); pointer-events:none; }
.cta-band .section-inner{ position:relative; z-index:1; max-width:680px; }
.cta-band h2{ margin-bottom:.4em; }
.cta-band p{ margin:0 auto 2em; max-width:52ch; }
.cta-band .btn-row{ justify-content:center; }
.cta-contact{ margin-top:2.5em; display:flex; justify-content:center; gap:clamp(28px,5vw,60px); flex-wrap:wrap; }
.cta-contact .lbl{ font-family:var(--font-mono); font-size:.64rem; letter-spacing:.18em; text-transform:uppercase; color:var(--text-secondary); display:block; margin-bottom:6px; }
.cta-contact a,.cta-contact span{ font-family:var(--font-display); font-weight:500; color:var(--text-primary); }
.cta-contact a:hover{ color:var(--accent); }

/* ---------------- Footer ---------------- */
.site-footer{ padding:clamp(48px,6vh,80px) 0 32px; background:var(--bg-primary); position:relative; }
.site-footer::before{ content:""; position:absolute; top:0; left:0; right:0; height:1px; background:linear-gradient(90deg,transparent,var(--divider) 20%,var(--accent) 50%,var(--divider) 80%,transparent); }
.footer-inner{ max-width:var(--container); margin:0 auto; padding:0 clamp(20px,4vw,48px); }
.footer-top{ display:grid; grid-template-columns:1.5fr 1fr 1fr 1fr; gap:clamp(28px,4vw,56px); margin-bottom:clamp(36px,5vh,60px); }
.footer-brand-text{ font-weight:300; font-size:.9rem; color:var(--text-secondary); line-height:1.6; margin-top:14px; max-width:280px; }
.footer-col h4{ font-family:var(--font-display); font-weight:600; font-size:.82rem; letter-spacing:.04em; margin-bottom:18px; color:var(--text-primary); }
.footer-col a{ display:block; font-weight:300; font-size:.85rem; color:var(--text-secondary); padding:4px 0; transition:color .3s; }
.footer-col a:hover{ color:var(--accent); }
.footer-cross{ color:var(--accent) !important; }
.footer-bottom{ display:flex; justify-content:space-between; align-items:center; gap:16px; padding-top:24px; border-top:1px solid var(--divider); flex-wrap:wrap; }
.footer-legal{ font-weight:300; font-size:.75rem; color:var(--text-secondary); max-width:70ch; }
@media(max-width:768px){ .footer-top{ grid-template-columns:1fr 1fr; } }
@media(max-width:480px){ .footer-top{ grid-template-columns:1fr; } }

/* ---------------- WhatsApp FAB ---------------- */
.wa-fab{ position:fixed; right:20px; bottom:20px; width:54px; height:54px; border-radius:50%; display:flex; align-items:center; justify-content:center; background:#25D366; color:#fff; z-index:9997; box-shadow:0 8px 24px -6px rgba(0,0,0,.5); transition:transform .3s var(--ease); }
.wa-fab:hover{ transform:translateY(-4px); }
.wa-fab svg{ width:28px; height:28px; }

/* ---------------- Reveal + reduced motion ---------------- */
.reveal{ opacity:0; transform:translateY(20px); transition:opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in{ opacity:1; transform:none; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  .reveal{ opacity:1 !important; transform:none !important; transition:none !important; }
  .menu-overlay{ transition:none; }
}