/* =========================================================
   WeighWell — Core Stylesheet
   Design tokens: deep forest green + leaf accent, growth-ring
   signature motif, Poppins/Inter/IBM Plex Mono type system.
   ========================================================= */

:root{
  --forest-900:#0b1a33;
  --forest-700:#1a3c6e;
  --forest-600:#224e8c;
  --leaf-500:#2f6fed;
  --leaf-300:#8fb8f6;
  --leaf-100:#dbe9fd;
  --sage-100:#eef4fc;
  --cream-50:#fbfcfe;
  --paper-0:#ffffff;
  --ink-900:#101827;
  --ink-600:#55627a;
  --line:#d8e3f2;

  --bg:var(--cream-50);
  --surface:var(--paper-0);
  --surface-2:var(--sage-100);
  --text:var(--ink-900);
  --text-muted:var(--ink-600);
  --accent:var(--leaf-500);
  --accent-strong:var(--forest-700);
  --border:var(--line);
  --shadow:0 8px 24px rgba(16,32,64,.08);
  --ring-track:#e3ecfb;

  --radius-lg:20px;
  --radius-md:14px;
  --radius-sm:9px;

  --font-display:'Poppins',sans-serif;
  --font-body:'Inter',sans-serif;
  --font-mono:'IBM Plex Mono',monospace;
}

html.dark{
  --bg:#0a1424;
  --surface:#101d33;
  --surface-2:#15263f;
  --text:#e8eefb;
  --text-muted:#93a5c4;
  --accent:#5b9bff;
  --accent-strong:#8fb8f6;
  --border:#20365a;
  --shadow:0 8px 28px rgba(0,0,0,.45);
  --ring-track:#182c4a;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-body);
  line-height:1.6;
  transition:background .25s ease,color .25s ease;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  color:var(--text);
  line-height:1.25;
  margin:0 0 .5em;
}
p{margin:0 0 1em}
a{color:var(--accent-strong);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
button{font-family:inherit}
:focus-visible{outline:3px solid var(--leaf-500);outline-offset:2px}

.container{max-width:1120px;margin:0 auto;padding:0 20px}

/* ---------- Skip link ---------- */
.skip-link{
  position:absolute;left:-999px;top:0;background:var(--accent-strong);color:#fff;
  padding:10px 16px;border-radius:0 0 8px 0;z-index:999;
}
.skip-link:focus{left:0}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
}
.header-inner{display:flex;align-items:center;gap:18px;padding:14px 20px;}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:700;font-size:1.15rem;color:var(--text)}
.brand:hover{text-decoration:none}
.brand-tld{color:var(--accent)}
.brand-mark{width:34px;height:34px;flex-shrink:0}
.brand-mark svg{width:100%;height:100%}

/* ---------- SVG icon system (replaces emoji) ---------- */
.ic-svg{flex-shrink:0;vertical-align:middle;color:currentColor}
.nav-top-btn .ic-svg{color:var(--text-muted)}
.nav-dropdown a .ic-svg{color:var(--accent-strong);opacity:.9}
.tool-list a .ic-svg{color:var(--accent-strong);opacity:.9}
.mobile-group a .ic-svg{color:var(--accent-strong)}
.chev .ic-svg{color:var(--text-muted)}
.eyebrow .ic-svg{color:var(--accent-strong)}

.main-nav{display:flex;gap:2px;margin-inline-start:8px;flex:1}
.nav-group{position:relative}
.nav-top-btn{
  background:none;border:none;color:var(--text);font-weight:600;font-size:.92rem;
  padding:10px 12px;border-radius:var(--radius-sm);cursor:pointer;display:flex;align-items:center;gap:8px;
  font-family:var(--font-body);
}
.nav-top-btn:hover{background:var(--surface-2)}
.nav-top-btn .chev{transition:transform .2s}
.nav-group.open .nav-top-btn .chev{transform:rotate(180deg)}
.nav-dropdown{
  position:absolute;top:calc(100% + 8px);inset-inline-start:0;min-width:240px;
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);
  box-shadow:var(--shadow);padding:8px;display:none;flex-direction:column;gap:2px;z-index:50;
}
.nav-group.open .nav-dropdown{display:flex}
.nav-dropdown a{
  color:var(--text);padding:9px 10px;border-radius:8px;font-size:.9rem;display:flex;align-items:center;gap:10px;
}
.nav-dropdown a:hover{background:var(--surface-2);text-decoration:none}

.header-actions{display:flex;align-items:center;gap:8px}
.icon-btn{
  background:var(--surface-2);border:1px solid var(--border);color:var(--text);
  width:38px;height:38px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  cursor:pointer;font-size:1rem;transition:border-color .15s,transform .1s;
}
.icon-btn:hover{border-color:var(--accent)}
.icon-btn:active{transform:scale(.94)}
.lang-btn{width:auto;padding:0 12px;font-weight:700;font-size:.8rem;letter-spacing:.02em}
.hamburger{display:none}

/* Mobile nav */
.mobile-nav{
  display:none;position:fixed;inset:0;background:var(--bg);z-index:200;
  padding:16px 20px;overflow-y:auto;
}
.mobile-nav.open{display:block}
.mobile-nav-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}
.mobile-group summary{font-family:var(--font-display);font-weight:700;padding:12px 4px;cursor:pointer;border-bottom:1px solid var(--border)}
.mobile-group a{display:flex;align-items:center;gap:12px;padding:11px 6px;color:var(--text);border-bottom:1px dashed var(--border)}

@media (max-width:900px){
  .main-nav{display:none}
  .hamburger{display:flex}
}

/* ---------- Hero ---------- */
.hero{
  padding:56px 0 40px;background:
    radial-gradient(1200px 400px at 15% -10%, var(--leaf-100), transparent 60%),
    var(--bg);
  border-bottom:1px solid var(--border);
}
html.dark .hero{background:radial-gradient(1200px 400px at 15% -10%, #16281f, transparent 60%),var(--bg)}
.hero-inner{display:grid;grid-template-columns:1.1fr .9fr;gap:36px;align-items:center}
@media (max-width:820px){.hero-inner{grid-template-columns:1fr}}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:.78rem;font-weight:700;letter-spacing:.08em;
  text-transform:uppercase;color:var(--accent-strong);background:var(--surface-2);
  padding:6px 12px;border-radius:999px;margin-bottom:14px;
}
.hero h1{font-size:clamp(1.9rem,4vw,2.7rem);max-width:16ch}
.hero .lead{font-size:1.05rem;color:var(--text-muted);max-width:52ch}
.hero-cta{display:flex;gap:12px;margin-top:22px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:12px 20px;border-radius:12px;font-weight:700;
  cursor:pointer;border:1px solid transparent;font-size:.95rem;
}
.btn-primary{background:var(--accent-strong);color:#fff}
.btn-primary:hover{background:var(--forest-600);text-decoration:none}
.btn-ghost{background:transparent;border-color:var(--border);color:var(--text)}
.btn-ghost:hover{border-color:var(--accent);text-decoration:none}

.hero-ring-art{display:flex;align-items:center;justify-content:center}

/* ---------- Category grid (home) ---------- */
.section{padding:52px 0}
.section-head{max-width:640px;margin-bottom:28px}
.section-head .kicker{color:var(--accent-strong);font-weight:700;font-size:.82rem;text-transform:uppercase;letter-spacing:.06em}

.cat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media (max-width:900px){.cat-grid{grid-template-columns:1fr}}
.cat-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:22px;box-shadow:var(--shadow);
}
.cat-card h3{display:flex;align-items:center;gap:12px;font-size:1.1rem}
.cat-card .cat-icon{width:38px;height:38px;border-radius:10px;background:var(--surface-2);color:var(--accent-strong);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.tool-list{list-style:none;margin:14px 0 0;padding:0;display:flex;flex-direction:column;gap:2px}
.tool-list a{
  display:flex;align-items:center;gap:11px;padding:9px 8px;border-radius:8px;color:var(--text);font-size:.93rem;
}
.tool-list a:hover{background:var(--surface-2);text-decoration:none}

/* ---------- Calculator page layout ---------- */
.calc-page-head{padding:36px 0 6px}
.calc-title-row{display:flex;align-items:center;gap:14px}
.calc-badge{width:52px;height:52px;border-radius:14px;background:var(--surface-2);color:var(--accent-strong);display:flex;align-items:center;justify-content:center;flex-shrink:0;border:1px solid var(--border)}
.breadcrumbs{font-size:.82rem;color:var(--text-muted);margin-bottom:10px}
.breadcrumbs a{color:var(--text-muted)}
.calc-sub{color:var(--text-muted);max-width:70ch}

.calc-wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:start;padding:24px 0 10px}
@media (max-width:900px){.calc-wrap{grid-template-columns:1fr}}

.card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:24px;box-shadow:var(--shadow);
}
.card h2{font-size:1.05rem;margin-bottom:16px}

.field-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}
.field-row.single{grid-template-columns:1fr}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-size:.83rem;font-weight:600;color:var(--text-muted)}
.field input[type=number],
.field input[type=text],
.field input[type=date],
.field input[type=time],
.field select{
  background:var(--surface-2);border:1px solid var(--border);border-radius:10px;
  padding:11px 12px;color:var(--text);font-size:.96rem;font-family:var(--font-body);width:100%;
}
.field input:focus,.field select:focus{border-color:var(--accent)}
.seg{display:flex;background:var(--surface-2);border:1px solid var(--border);border-radius:10px;overflow:hidden}
.seg button{flex:1;background:transparent;border:none;padding:10px 8px;color:var(--text-muted);font-weight:700;font-size:.85rem;cursor:pointer}
.seg button.active{background:var(--accent-strong);color:#fff}
.unit-suffix{position:relative}
.unit-suffix span{position:absolute;inset-inline-end:12px;top:50%;transform:translateY(-50%);font-size:.78rem;color:var(--text-muted)}

.calc-actions{display:flex;gap:10px;margin-top:6px}

/* Result panel */
.result-card{position:sticky;top:90px}
.ring-wrap{display:flex;flex-direction:column;align-items:center;text-align:center;gap:10px}
.ring-svg{width:180px;height:180px}
.gauge-svg{width:100%;max-width:280px;height:auto}
.gauge-needle{transition:x2 .5s cubic-bezier(.4,0,.2,1),y2 .5s cubic-bezier(.4,0,.2,1)}
.ring-value{font-family:var(--font-mono);font-size:1.7rem;font-weight:700}
.ring-label{color:var(--text-muted);font-size:.85rem}
.gauge-legend{display:flex;flex-wrap:wrap;justify-content:center;gap:10px 14px;margin-top:12px;padding-top:12px;border-top:1px dashed var(--border)}
.gauge-legend span{display:flex;align-items:center;gap:6px;font-size:.76rem;color:var(--text-muted)}
.gauge-legend i{width:9px;height:9px;border-radius:50%;display:inline-block;flex-shrink:0}
.result-list{list-style:none;margin:16px 0 0;padding:0;display:flex;flex-direction:column;gap:0}
.result-list li{display:flex;justify-content:space-between;padding:10px 0;border-top:1px dashed var(--border);font-size:.92rem}
.result-list li span:first-child{color:var(--text-muted)}
.result-list li span:last-child{font-family:var(--font-mono);font-weight:700}
.result-note{font-size:.82rem;color:var(--text-muted);margin-top:14px;padding-top:12px;border-top:1px solid var(--border)}
.result-empty{color:var(--text-muted);font-size:.9rem;text-align:center;padding:20px 0}

/* Scientific calculator */
.sci-calc{max-width:420px}
.sci-display{
  background:var(--surface-2);border:1px solid var(--border);border-radius:12px;padding:16px;
  text-align:end;font-family:var(--font-mono);margin-bottom:14px;
}
.sci-display .sci-prev{font-size:.8rem;color:var(--text-muted);min-height:1.1em;overflow-wrap:anywhere}
.sci-display .sci-cur{font-size:1.7rem;font-weight:700;overflow-wrap:anywhere}
.sci-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}
.sci-grid button{
  background:var(--surface-2);border:1px solid var(--border);border-radius:9px;color:var(--text);
  padding:12px 0;font-weight:700;cursor:pointer;font-size:.92rem;font-family:var(--font-mono);
}
.sci-grid button:hover{border-color:var(--accent)}
.sci-grid button.op{background:var(--accent-strong);color:#fff;border-color:transparent}
.sci-grid button.eq{background:var(--leaf-500);color:#0e2a1f;border-color:transparent}
.sci-grid button.wide{grid-column:span 2}

/* Countdown */
.countdown-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:10px}
.countdown-grid .cd-box{background:var(--surface-2);border:1px solid var(--border);border-radius:12px;padding:14px 6px;text-align:center}
.countdown-grid .cd-num{font-family:var(--font-mono);font-size:1.5rem;font-weight:700}
.countdown-grid .cd-lbl{font-size:.72rem;color:var(--text-muted);text-transform:uppercase}

/* ---------- Explanatory / SEO text ---------- */
.explain{padding:34px 0 60px}
.explain-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:30px clamp(18px,4vw,40px);box-shadow:var(--shadow);
}
.explain h2{font-size:1.3rem;margin-top:1.2em}
.explain h2:first-child{margin-top:0}
.explain p{color:var(--text-muted)}
.explain ul{color:var(--text-muted);padding-inline-start:20px}
.leaf-divider{display:flex;align-items:center;gap:12px;margin:26px 0;color:var(--accent-strong)}
.leaf-divider::before,.leaf-divider::after{content:"";flex:1;height:1px;background:var(--border)}

/* ---------- Related calculators cross-link section ---------- */
.related-section{padding:8px 0 44px}
.related-card-outer{
  background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:26px clamp(18px,4vw,34px);
}
.related-card-outer h2{font-size:1.1rem;margin-bottom:4px}
.related-card-outer > p{margin-bottom:18px}
.related-group{margin-top:18px}
.related-group:first-of-type{margin-top:4px}
.related-group h4{
  display:flex;align-items:center;gap:8px;font-size:.8rem;text-transform:uppercase;letter-spacing:.05em;
  color:var(--accent-strong);margin-bottom:10px;font-family:var(--font-body);font-weight:700;
}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:8px}
.related-card{
  display:flex;align-items:center;gap:9px;padding:10px 12px;border-radius:10px;background:var(--surface);
  border:1px solid var(--border);color:var(--text);font-size:.87rem;
}
.related-card:hover{border-color:var(--accent);text-decoration:none;background:var(--sage-100)}
html.dark .related-card:hover{background:var(--surface)}
.related-card .ic-svg{color:var(--accent-strong);flex-shrink:0}

/* ---------- Footer ---------- */
.site-footer{background:var(--surface);border-top:1px solid var(--border);margin-top:20px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px;padding:44px 0 26px}
@media (max-width:800px){.footer-grid{grid-template-columns:1fr 1fr}}
.footer-grid h4{font-size:.85rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);margin-bottom:14px}
.footer-grid ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:9px}
.footer-grid a{color:var(--text);font-size:.9rem}
.footer-brand p{color:var(--text-muted);font-size:.88rem;max-width:32ch}
.footer-bottom{border-top:1px solid var(--border);padding:18px 0;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;color:var(--text-muted);font-size:.82rem}

/* ---------- Static pages ---------- */
.static-page{padding:44px 0 70px}
.static-page .card{max-width:820px;margin:0 auto}
.static-page h2{font-size:1.15rem;margin-top:1.4em}
.static-page p,.static-page li{color:var(--text-muted)}

.contact-cards{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:20px 0 28px}
@media (max-width:560px){.contact-cards{grid-template-columns:1fr}}
.contact-card{
  display:flex;align-items:center;gap:14px;padding:18px;border-radius:var(--radius-md);
  background:var(--surface-2);border:1px solid var(--border);color:var(--text);
}
.contact-card:hover{border-color:var(--accent);text-decoration:none;background:var(--sage-100)}
html.dark .contact-card:hover{background:var(--surface)}
.contact-card .ic-svg{color:var(--accent-strong);flex-shrink:0}
.contact-card div{display:flex;flex-direction:column;gap:2px;min-width:0}
.contact-card strong{font-size:.82rem;color:var(--text-muted);font-weight:600}
.contact-card span{font-family:var(--font-mono);font-size:.92rem;font-weight:600;word-break:break-word}

/* ---------- RTL adjustments ---------- */
html[dir="rtl"] .ring-value,
html[dir="rtl"] .result-list li span:last-child,
html[dir="rtl"] .cd-num,
html[dir="rtl"] .sci-display{font-family:var(--font-body)}
html[dir="rtl"] .unit-suffix span{font-family:var(--font-body)}

/* ---------- Lang visibility ---------- */
[data-en]{display:inline}
[data-ar]{display:none}
html[lang="ar"] [data-en]{display:none}
html[lang="ar"] [data-ar]{display:inline}
[data-en-block]{display:block}
[data-ar-block]{display:none}
html[lang="ar"] [data-en-block]{display:none}
html[lang="ar"] [data-ar-block]{display:block}

/* Utility */
.text-center{text-align:center}
.mt-0{margin-top:0}
.small{font-size:.82rem;color:var(--text-muted)}