/* ============================================================
   HoweHow — shared.css
   Global styles. Loaded on every page via <link>.
   ============================================================ */

/* ── Variables ── */
:root {
  /* Backgrounds */
  --bg:#f8f9fb; --bg2:#f0f2f6; --surface:#ffffff; --surface2:#eef0f5;
  /* Borders & text */
  --border:#e2e5ed; --text:#0f1623; --text2:#4a5568; --text3:#9aa3b2;
  /* Primary accent — deep professional blue */
  --accent:#1b4fd8; --accent2:#2563eb; --accent-bg:#eff4ff;
  /* Secondary — teal CTA */
  --cta:#0f766e; --cta2:#0d9488; --cta-bg:#f0fdfa;
  /* Utility */
  --accent3:#0f766e; --green:#059669;
  --shadow:0 1px 8px rgba(15,22,35,.07); --shadow-lg:0 8px 32px rgba(15,22,35,.12);
  --radius:12px; --radius-sm:7px;
  /* Fonts — Plus Jakarta Sans headings, Inter body */
  --font-head:'Plus Jakarta Sans',sans-serif;
  --font-body:'Inter',sans-serif;
  --t:.2s cubic-bezier(.4,0,.2,1); --header-h:64px;
}
[data-theme="dark"] {
  --bg:#0d1117; --bg2:#161b25; --surface:#1c2232; --surface2:#212840;
  --border:#2d3650; --text:#e8ecf4; --text2:#8892a4; --text3:#4a556a;
  --accent:#4f7ef8; --accent2:#6b93fa; --accent-bg:#1a2448;
  --cta:#2dd4bf; --cta2:#5eead4; --cta-bg:#0d2926;
  --accent3:#2dd4bf; --green:#34d399;
  --shadow:0 1px 8px rgba(0,0,0,.35); --shadow-lg:0 8px 32px rgba(0,0,0,.5);
}

/* ── Reset ── */
*,*::before,*::after { box-sizing:border-box; margin:0; padding:0 }
html { scroll-behavior:smooth }
body { font-family:var(--font-body); background:var(--bg); color:var(--text);
  line-height:1.6; transition:background var(--t),color var(--t); overflow-x:hidden }
a { color:inherit; text-decoration:none }
img { max-width:100%; display:block }
ul { list-style:none }
button { cursor:pointer; border:none; background:none; font-family:var(--font-body) }
[id] { scroll-margin-top:calc(var(--header-h) + 20px) }

/* ── Skip link ── */
.skip-link { position:absolute; top:-100px; left:16px; padding:8px 16px;
  background:var(--accent); color:#fff; border-radius:var(--radius-sm);
  font-weight:600; z-index:9999; transition:top .2s }
.skip-link:focus { top:16px }

/* ════════════════════════════════
   HEADER
   shared.js renders into <div id="site-header">
════════════════════════════════ */
#site-header {
  position:sticky; top:0; z-index:100; height:var(--header-h);
  background:var(--surface); border-bottom:1px solid var(--border);
  backdrop-filter:blur(12px); -webkit-backdrop-filter:blur(12px);
}
.header-inner { max-width:1380px; margin:0 auto; padding:0 24px;
  height:100%; display:flex; align-items:center; gap:20px }
.logo { display:flex; align-items:center; gap:10px; flex-shrink:0;
  font-family:var(--font-head); font-weight:800; font-size:1.45rem;
  letter-spacing:-.04em; color:var(--text) }
.logo-icon { width:36px; height:36px; border-radius:9px;
  background:linear-gradient(135deg,var(--accent) 0%,var(--accent2) 100%);
  display:flex; align-items:center; justify-content:center;
  color:#fff; font-size:1rem; font-weight:800; flex-shrink:0;
  box-shadow:0 2px 8px rgba(27,79,216,.25) }
.logo span { color:var(--accent) }
.logo-e {
  background:linear-gradient(135deg,#f59e0b 0%,#ef4444 50%,#8b5cf6 100%);
  -webkit-background-clip:text; -webkit-text-fill-color:transparent;
  background-clip:text; font-weight:900; display:inline-block;
  margin:0 1px;
}
.header-search { flex:1; max-width:460px; position:relative }
.header-search input { width:100%; padding:10px 16px 10px 42px;
  background:var(--bg2); border:1.5px solid var(--border); border-radius:100px;
  font-family:var(--font-body); font-size:.9rem; color:var(--text); outline:none;
  transition:border-color var(--t),box-shadow var(--t) }
.header-search input:focus { border-color:var(--accent); box-shadow:0 0 0 3px var(--accent-bg) }
.header-search input::placeholder { color:var(--text3) }
.header-search .s-icon { position:absolute; left:14px; top:50%; transform:translateY(-50%);
  color:var(--text3); pointer-events:none; font-size:1rem }
.header-controls { margin-left:auto; display:flex; align-items:center; gap:10px }
.lang-select { padding:8px 12px; border-radius:100px; border:1.5px solid var(--border);
  background:var(--bg2); color:var(--text); font-family:var(--font-body);
  font-size:.82rem; outline:none; cursor:pointer; transition:border-color var(--t) }
.lang-select:focus { border-color:var(--accent) }
.dark-toggle { width:40px; height:40px; border-radius:50%;
  background:var(--bg2); border:1.5px solid var(--border);
  display:flex; align-items:center; justify-content:center;
  color:var(--text2); font-size:1.1rem;
  transition:background var(--t),border-color var(--t),transform .2s }
.dark-toggle:hover { background:var(--accent-bg); border-color:var(--accent); transform:rotate(15deg) }
/* hamburger hidden by default, shown at ≤768px via media query */
.hamburger { display:none; width:40px; height:40px; border-radius:var(--radius-sm);
  background:var(--bg2); border:1.5px solid var(--border);
  align-items:center; justify-content:center; flex-direction:column; gap:5px; padding:10px }
.hamburger span { display:block; width:100%; height:2px; background:var(--text);
  border-radius:2px; transition:all .2s }

/* ════════════════════════════════
   AD SLOTS
════════════════════════════════ */
.ad-leaderboard { background:var(--bg2); border-bottom:1px solid var(--border);
  display:flex; align-items:center; justify-content:center; min-height:90px; padding:8px }
.ad-placeholder { width:100%; max-width:728px; min-height:90px;
  border:2px dashed var(--border); border-radius:var(--radius-sm);
  display:flex; align-items:center; justify-content:center;
  color:var(--text3); font-size:.8rem; letter-spacing:.08em;
  text-transform:uppercase; font-weight:500; text-align:center }
.ad-placeholder.wide { max-width:970px }
.ad-mid { padding:32px 0; display:flex; justify-content:center }
.sidebar-ad { border:2px dashed var(--border); border-radius:var(--radius);
  min-height:250px; display:flex; align-items:center; justify-content:center;
  color:var(--text3); font-size:.75rem; text-transform:uppercase;
  letter-spacing:.08em; text-align:center; padding:8px; line-height:1.8 }

/* ════════════════════════════════
   BREADCRUMB
════════════════════════════════ */
.breadcrumb { padding:14px 0; display:flex; align-items:center; gap:6px;
  font-size:.82rem; color:var(--text3); flex-wrap:wrap }
.breadcrumb a { color:var(--text3); transition:color var(--t) }
.breadcrumb a:hover { color:var(--accent) }
.breadcrumb .sep { font-size:.7rem }

/* ════════════════════════════════
   LAYOUT
════════════════════════════════ */
.page-wrap { max-width:1380px; margin:0 auto; padding:0 24px }
.content-with-sidebar { display:grid; grid-template-columns:1fr 300px; gap:32px; align-items:start }
.sidebar { position:sticky; top:calc(var(--header-h) + 20px); display:flex; flex-direction:column; gap:20px }
.sidebar-widget { background:var(--surface); border:1.5px solid var(--border);
  border-radius:var(--radius); padding:20px }
.sidebar-widget h3 { font-family:var(--font-head); font-size:.95rem; font-weight:700;
  margin-bottom:14px; color:var(--text) }
.widget-list li { border-bottom:1px solid var(--border) }
.widget-list li:last-child { border-bottom:none }
.widget-list a { display:flex; align-items:center; gap:8px; padding:9px 0;
  font-size:.83rem; color:var(--text2); transition:color var(--t) }
.widget-list a:hover { color:var(--accent) }

/* ════════════════════════════════
   SECTION HEADER
════════════════════════════════ */
.section-head { display:flex; align-items:baseline; justify-content:space-between;
  margin-bottom:24px; padding-bottom:14px; border-bottom:1px solid var(--border) }
.section-head h2 { font-family:var(--font-head); font-size:clamp(1.3rem,2.5vw,1.7rem);
  font-weight:700; letter-spacing:-.03em; color:var(--text) }
.section-head h2 span { color:var(--accent) }
.section-head a { font-size:.85rem; color:var(--accent); font-weight:600;
  display:flex; align-items:center; gap:4px; transition:gap var(--t) }
.section-head a:hover { gap:8px }

/* ════════════════════════════════
   TOOL CARDS  (used on category index pages)
════════════════════════════════ */
.tools-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(260px,1fr)); gap:14px }
.tool-card { background:var(--surface); border:1.5px solid var(--border);
  border-radius:var(--radius); padding:20px;
  display:flex; align-items:flex-start; gap:14px;
  transition:all var(--t); text-decoration:none; color:inherit }
.tool-card:hover { border-color:var(--accent); box-shadow:var(--shadow); transform:translateY(-2px) }
.tool-card-icon { width:42px; height:42px; border-radius:10px; flex-shrink:0;
  background:var(--bg2); display:flex; align-items:center; justify-content:center; font-size:1.2rem }
.tool-card-body { flex:1; min-width:0 }
.tool-card-name { font-family:var(--font-head); font-size:.95rem; font-weight:700;
  color:var(--text); margin-bottom:5px }
.tool-card-desc { font-size:.8rem; color:var(--text2); line-height:1.5 }
.tool-badge { flex-shrink:0; padding:3px 8px; border-radius:100px;
  background:#dcfce7; color:#16a34a; font-size:.7rem; font-weight:600 }
[data-theme="dark"] .tool-badge { background:#14532d; color:#4ade80 }

/* ════════════════════════════════
   TOOL PAGE — HERO BAND
════════════════════════════════ */
.tool-hero { padding:36px 0 28px; border-bottom:1px solid var(--border); margin-bottom:32px }
.tool-hero-eyebrow { display:inline-flex; align-items:center; gap:8px; padding:5px 12px;
  border-radius:100px; background:var(--accent-bg); border:1px solid rgba(232,76,30,.25);
  color:var(--accent); font-size:.78rem; font-weight:600; letter-spacing:.06em;
  text-transform:uppercase; margin-bottom:14px }
.tool-hero h1 { font-family:var(--font-head); font-size:clamp(1.6rem,3.5vw,2.6rem);
  font-weight:800; letter-spacing:-.04em; line-height:1.15; color:var(--text); margin-bottom:10px }
.tool-hero-sub { font-size:1rem; color:var(--text2); max-width:600px; line-height:1.7 }

/* ════════════════════════════════
   TOOL BOX  (the interactive calculator panel)
════════════════════════════════ */
.tool-box { background:var(--surface); border:1.5px solid var(--border);
  border-radius:var(--radius); padding:28px; margin-bottom:24px }
.tool-box h2 { font-family:var(--font-head); font-size:1.05rem; font-weight:700;
  margin-bottom:20px; color:var(--text); display:flex; align-items:center; gap:8px }

/* Form rows */
.form-row { display:grid; grid-template-columns:1fr 1fr; gap:16px; margin-bottom:16px }
.form-row.single { grid-template-columns:1fr }
.form-row.triple { grid-template-columns:1fr 1fr 1fr }
.form-group { display:flex; flex-direction:column; gap:5px }
.form-group label { font-size:.82rem; font-weight:600; color:var(--text2) }
.form-group .hint { font-size:.74rem; color:var(--text3); font-weight:400 }
.form-group input,
.form-group select,
.form-group textarea {
  padding:11px 14px; background:var(--bg2); border:1.5px solid var(--border);
  border-radius:var(--radius-sm); font-family:var(--font-body); font-size:.9rem;
  color:var(--text); outline:none; width:100%;
  transition:border-color var(--t),box-shadow var(--t) }
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { border-color:var(--accent); box-shadow:0 0 0 3px var(--accent-bg) }
.form-group input.error,
.form-group select.error { border-color:#dc2626 }
.field-error { font-size:.76rem; color:#dc2626; margin-top:3px; display:none }
.field-error.show { display:block }
.form-group input::placeholder { color:var(--text3) }

/* Buttons */
.btn-row { display:flex; gap:10px; flex-wrap:wrap; margin-top:20px }
.btn { padding:13px 28px; border-radius:100px; font-family:var(--font-head);
  font-weight:700; font-size:.92rem; letter-spacing:.01em;
  transition:all .18s; display:inline-flex; align-items:center; gap:8px }
.btn-primary { background:linear-gradient(135deg,var(--cta) 0%,var(--cta2) 100%); color:#fff;
  box-shadow:0 2px 8px rgba(15,118,110,.25) }
.btn-primary:hover { opacity:.92; transform:scale(1.02) }
.btn-primary:active { transform:scale(.98) }
.btn-secondary { background:var(--bg2); color:var(--text); border:1.5px solid var(--border) }
.btn-secondary:hover { border-color:var(--accent); color:var(--accent) }
.btn-export { background:var(--accent3); color:#fff }
.btn-export:hover { opacity:.88 }
.btn[disabled] { opacity:.45; pointer-events:none }

/* Spinner inside buttons */
.spinner { width:18px; height:18px; border:2.5px solid rgba(255,255,255,.3);
  border-top-color:#fff; border-radius:50%; animation:spin .7s linear infinite; display:none }
.spinner.show { display:inline-block }
@keyframes spin { to { transform:rotate(360deg) } }

/* Ad slot between inputs and result */
.ad-before-btn { margin:20px 0; display:flex; justify-content:center }

/* ════════════════════════════════
   RESULT BOX
════════════════════════════════ */
.result-box { background:var(--accent-bg); border:1.5px solid rgba(27,79,216,.15);
  border-radius:var(--radius); padding:24px; margin-top:24px; display:none }
.result-box.show { display:block; animation:fadeSlide .3s ease }
@keyframes fadeSlide { from{opacity:0;transform:translateY(8px)} to{opacity:1;transform:none} }
.result-primary { font-family:var(--font-head); font-size:2.2rem; font-weight:800;
  color:var(--accent); letter-spacing:-.04em; margin-bottom:6px }
.result-label { font-size:.82rem; color:var(--text2); text-transform:uppercase;
  letter-spacing:.06em; font-weight:600 }
.result-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(140px,1fr));
  gap:12px; margin-top:16px }
.result-stat { background:var(--surface); border-radius:var(--radius-sm);
  padding:12px 14px; border:1px solid var(--border) }
.result-stat-val { font-family:var(--font-head); font-size:1.15rem; font-weight:700; color:var(--text) }
.result-stat-lbl { font-size:.74rem; color:var(--text3); text-transform:uppercase; letter-spacing:.05em }

/* Ad slot after result */
.ad-after-result { margin:24px 0; display:flex; justify-content:center }

/* Chart wrapper */
.chart-wrap { margin-top:20px; position:relative; height:280px }

/* ════════════════════════════════
   CATEGORY HUB — HERO
════════════════════════════════ */
.cat-hero { padding:48px 0 36px; position:relative; overflow:hidden;
  border-left:4px solid var(--accent); padding-left:28px }
.cat-hero::before { content:''; position:absolute; inset:0;
  background:linear-gradient(135deg,var(--accent-bg) 0%,transparent 60%);
  opacity:.35; pointer-events:none }
.cat-hero-icon { font-size:3rem; margin-bottom:14px; display:inline-block;
  animation:float 3s ease-in-out infinite; position:relative; z-index:1 }
@keyframes float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-6px)} }
.cat-hero h1 { font-family:var(--font-head); font-size:clamp(2rem,4vw,3rem);
  font-weight:800; letter-spacing:-.04em; color:var(--text); margin-bottom:12px;
  position:relative; z-index:1 }
.cat-hero h1 span { color:var(--accent) }
.cat-hero p { font-size:1rem; color:var(--text2); max-width:560px; line-height:1.75;
  position:relative; z-index:1 }
.cat-stats { display:flex; gap:28px; flex-wrap:wrap; margin-top:24px; position:relative; z-index:1 }
.cat-stat strong { display:block; font-family:var(--font-head); font-size:1.6rem;
  font-weight:800; color:var(--text); letter-spacing:-.04em }
.cat-stat span { font-size:.78rem; color:var(--text3); text-transform:uppercase; letter-spacing:.05em }

/* ════════════════════════════════
   DOC / SEO CONTENT SECTION
════════════════════════════════ */
.doc-section { padding:48px 0 }
.doc-section h2 { font-family:var(--font-head); font-size:clamp(1.3rem,2.5vw,1.8rem);
  font-weight:700; letter-spacing:-.03em; margin-bottom:14px }
.doc-section h3 { font-family:var(--font-head); font-size:1.1rem; font-weight:700; margin:24px 0 8px }
.doc-section p { color:var(--text2); line-height:1.82; margin-bottom:14px; font-size:.93rem }
.doc-section ul { padding-left:18px; margin-bottom:14px }
.doc-section ul li { color:var(--text2); font-size:.93rem; line-height:1.75; list-style:disc; margin-bottom:6px }

/* ════════════════════════════════
   FAQ ACCORDION
════════════════════════════════ */
.faq-list { display:flex; flex-direction:column; gap:2px; max-width:780px }
.faq-item { background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius-sm); overflow:hidden }
.faq-q { display:flex; justify-content:space-between; align-items:center;
  padding:16px 20px; cursor:pointer; font-weight:600; font-size:.92rem;
  color:var(--text); transition:background var(--t); gap:12px }
.faq-q:hover { background:var(--bg2) }
.faq-q-icon { flex-shrink:0; transition:transform .25s; color:var(--text3); font-size:1.1rem }
.faq-item.open .faq-q-icon { transform:rotate(45deg) }
.faq-a { padding:0 20px; max-height:0; overflow:hidden;
  transition:max-height .3s ease,padding .3s ease }
.faq-item.open .faq-a { max-height:400px; padding:0 20px 16px }
.faq-a p { font-size:.88rem; color:var(--text2); line-height:1.75 }

/* ════════════════════════════════
   FOOTER
   shared.js renders into <footer id="site-footer">
   4-col grid: brand | industries | company | legal
════════════════════════════════ */
#site-footer { background:var(--surface); border-top:1px solid var(--border); padding:56px 24px 0 }
.footer-inner { max-width:1380px; margin:0 auto }
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:40px; margin-bottom:40px }
.footer-brand p { font-size:.85rem; color:var(--text2); line-height:1.7; max-width:260px; margin-top:12px }
.footer-social { display:flex; gap:10px; margin-top:16px }
.social-btn { width:36px; height:36px; border-radius:9px; background:var(--bg2);
  border:1px solid var(--border); display:flex; align-items:center; justify-content:center;
  color:var(--text2); font-size:.9rem; transition:all var(--t) }
.social-btn:hover { background:var(--accent); border-color:var(--accent); color:#fff }
.footer-col h4 { font-family:var(--font-head); font-size:.85rem; font-weight:700;
  text-transform:uppercase; letter-spacing:.06em; color:var(--text); margin-bottom:16px }
.footer-col ul { display:flex; flex-direction:column; gap:9px }
.footer-col ul a { font-size:.84rem; color:var(--text2); transition:color var(--t) }
.footer-col ul a:hover { color:var(--accent) }
.footer-bottom { border-top:1px solid var(--border); padding:20px 0;
  display:flex; align-items:center; justify-content:space-between;
  flex-wrap:wrap; gap:12px; font-size:.8rem; color:var(--text3) }
.footer-bottom a { color:var(--text3); transition:color var(--t) }
.footer-bottom a:hover { color:var(--accent) }

/* ════════════════════════════════
   BACK TO TOP
════════════════════════════════ */
#btt { position:fixed; bottom:28px; right:28px; z-index:300;
  width:46px; height:46px; border-radius:50%;
  background:linear-gradient(135deg,var(--accent) 0%,var(--accent2) 100%); color:#fff;
  display:flex; align-items:center; justify-content:center; font-size:1.1rem;
  box-shadow:0 4px 16px rgba(27,79,216,.35); opacity:0; pointer-events:none;
  transition:opacity .3s,transform .3s; transform:translateY(12px) }
#btt.show { opacity:1; pointer-events:auto; transform:translateY(0) }
#btt:hover { transform:translateY(-3px) scale(1.05) }

/* ════════════════════════════════
   MOBILE NAV
   Injected by shared.js into <body>
════════════════════════════════ */
#mobile-nav { position:fixed; inset:0; z-index:500; background:var(--surface);
  padding:80px 24px 40px; transform:translateX(-100%);
  transition:transform .3s cubic-bezier(.4,0,.2,1); overflow-y:auto }
#mobile-nav.open { transform:translateX(0) }
.mobile-close { position:absolute; top:20px; right:20px; width:40px; height:40px;
  border-radius:50%; background:var(--bg2); display:flex; align-items:center;
  justify-content:center; font-size:1.2rem; color:var(--text) }
.mobile-nav-item { display:flex; align-items:center; gap:12px; padding:13px 16px;
  border-radius:var(--radius-sm); background:var(--bg2); font-weight:500;
  color:var(--text); font-size:.9rem; margin-bottom:6px; text-decoration:none }
.mobile-nav-item:hover { background:var(--accent-bg); color:var(--accent) }

/* ════════════════════════════════
   FADE-UP ANIMATION
════════════════════════════════ */
.fade-up { opacity:0; transform:translateY(20px); transition:opacity .5s ease,transform .5s ease }
.fade-up.visible { opacity:1; transform:translateY(0) }

/* ════════════════════════════════
   RESPONSIVE
════════════════════════════════ */
@media(max-width:1100px) {
  .content-with-sidebar { grid-template-columns:1fr }
  .sidebar { position:static }
  .footer-grid { grid-template-columns:1fr 1fr }
}
@media(max-width:768px) {
  .header-search { display:none }
  .hamburger { display:flex }
  .form-row,.form-row.triple { grid-template-columns:1fr }
  .footer-grid { grid-template-columns:1fr 1fr; gap:28px }
  .cat-hero { padding:32px 0 24px }
}
@media(max-width:480px) {
  .header-inner,.page-wrap { padding:0 16px }
  .footer-grid { grid-template-columns:1fr }
  .btn-row { flex-direction:column }
  .btn { justify-content:center }
  .result-primary { font-size:1.7rem }
  .tool-hero h1 { font-size:1.6rem }
}