@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,wght@0,400;0,600;1,400&family=Epilogue:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg: #F8F6F1;
  --surface: #FFFFFF;
  --border: #E4DFD6;
  --text: #1C1917;
  --muted: #6B6760;
  --faint: #A09D97;
  --accent: #1D4E3F;
  --accent-h: #163D31;
  --accent-light: #EAF2EE;
  --accent2: #C4622D;
  --yellow: #F0C040;
  --sans: 'Epilogue', sans-serif;
  --serif: 'Fraunces', serif;
  --mono: 'JetBrains Mono', monospace;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow: 0 2px 8px rgba(0,0,0,0.06);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--bg);color:var(--text);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;line-height:1.2}
.container{max-width:1140px;margin:0 auto;padding:0 1.5rem}

/* ── NAV ── */
.nav{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:200}
.nav-inner{display:flex;align-items:center;height:62px;gap:0;position:relative}
.nav-logo{display:flex;align-items:center;gap:10px;margin-right:1.5rem;flex-shrink:0}
.logo-mark{width:32px;height:32px;background:var(--accent);color:#fff;border-radius:8px;display:flex;align-items:center;justify-content:center;font-family:var(--serif);font-size:18px;font-weight:600}
.logo-text{font-family:var(--serif);font-size:1.2rem;color:var(--text);font-weight:600}
.logo-text em{font-style:italic;color:var(--accent)}
.nav-links{display:flex;align-items:center;flex:1;gap:2px}
.nav-item{position:relative}
.nav-trigger{display:flex;align-items:center;gap:5px;padding:8px 11px;background:transparent;border:none;font-size:13px;font-weight:500;color:var(--muted);border-radius:8px;cursor:pointer;font-family:var(--sans);transition:all .15s;white-space:nowrap}
.nav-trigger:hover,.nav-item:hover .nav-trigger{background:var(--bg);color:var(--text)}
.nav-trigger svg{opacity:.5;transition:transform .15s}
.nav-item:hover .nav-trigger svg{transform:rotate(180deg)}
.nav-dropdown{display:none;position:absolute;top:100%;left:0;background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:0 8px 32px rgba(0,0,0,.1);min-width:240px;padding:8px;z-index:300;padding-top:14px;margin-top:0}
.nav-dropdown::before{content:'';position:absolute;top:-10px;left:0;right:0;height:10px;background:transparent}
.nav-item:hover .nav-dropdown{display:block;animation:dropIn .15s ease}
@keyframes dropIn{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}
.dd-header{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.07em;color:var(--faint);padding:6px 10px 8px;border-bottom:1px solid var(--border);margin-bottom:4px}
.dd-item{display:block;padding:7px 10px;border-radius:8px;font-size:13px;font-weight:500;color:var(--text);transition:background .12s}
.dd-item:hover{background:var(--bg)}
.dd-item span{display:block;font-size:11px;color:var(--faint);font-weight:400;margin-top:1px}
.nav-right{margin-left:auto;display:flex;align-items:center;gap:10px}
.nav-all-btn{padding:7px 14px;background:var(--accent);color:#fff;border-radius:8px;font-size:13px;font-weight:600;white-space:nowrap;transition:background .15s}
.nav-all-btn:hover{background:var(--accent-h)}
.hamburger{display:none;flex-direction:column;gap:5px;background:transparent;border:none;cursor:pointer;padding:6px}
.hamburger span{display:block;width:22px;height:2px;background:var(--text);border-radius:2px}
.mobile-menu{display:none;background:#fff;border-top:1px solid var(--border);padding:1rem 1.5rem 1.5rem;max-height:75vh;overflow-y:auto}
.mobile-menu.open{display:block}
.mm-section{margin-bottom:1.25rem}
.mm-head{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.07em;color:var(--faint);margin-bottom:6px}
.mm-link{display:block;padding:8px 0;font-size:15px;color:var(--text);border-bottom:1px solid var(--border)}
.mm-link:last-child{border-bottom:none}

/* ── HERO (homepage) ── */
.hero{background:var(--accent);padding:4rem 0 3rem;overflow:hidden;position:relative}
.hero::before{content:'';position:absolute;top:-80px;right:-60px;width:360px;height:360px;background:rgba(255,255,255,.03);border-radius:50%}
.hero-eyebrow{display:inline-block;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.1em;color:rgba(255,255,255,.6);background:rgba(255,255,255,.08);padding:5px 14px;border-radius:50px;margin-bottom:1.25rem}
.hero h1{font-size:clamp(2rem,5vw,3.4rem);color:#fff;margin-bottom:1rem}
.hero h1 em{font-style:italic;color:var(--yellow)}
.hero p{font-size:1.05rem;color:rgba(255,255,255,.7);max-width:520px;margin-bottom:2rem}
.hero-search-wrap{display:flex;align-items:center;max-width:480px;background:#fff;border-radius:50px;padding:0 18px;gap:8px;box-shadow:0 4px 24px rgba(0,0,0,.15)}
.hero-search-wrap svg{color:var(--muted);flex-shrink:0}
#hero-search{flex:1;padding:13px 0;border:none;outline:none;font-size:15px;color:var(--text);background:transparent;font-family:var(--sans)}
#hero-search::placeholder{color:var(--faint)}
.hero-stats{display:flex;align-items:center;gap:2rem;margin-top:2.5rem}
.stat-item strong{display:block;font-size:1.5rem;color:#fff;font-family:var(--serif)}
.stat-item span{font-size:13px;color:rgba(255,255,255,.55)}
.stat-div{width:1px;height:34px;background:rgba(255,255,255,.15)}

/* ── CAT BAR ── */
.cat-bar{background:#fff;border-bottom:1px solid var(--border);padding:10px 0;position:sticky;top:62px;z-index:90;overflow-x:auto;scrollbar-width:none}
.cat-bar::-webkit-scrollbar{display:none}
.cat-pills{display:flex;gap:6px;padding:0 1.5rem}
.cat-pill{flex-shrink:0;display:flex;align-items:center;gap:5px;padding:6px 14px;border-radius:50px;border:1px solid var(--border);background:transparent;font-size:13px;font-weight:500;color:var(--muted);cursor:pointer;font-family:var(--sans);transition:all .15s}
.cat-pill:hover{border-color:var(--accent);color:var(--accent)}
.cat-pill.active{background:var(--accent);color:#fff;border-color:var(--accent)}

/* ── HOMEPAGE GRID ── */
.home-body{padding:2.5rem 0 4rem}
.home-section{margin-bottom:2.5rem}
.section-head{display:flex;align-items:center;gap:10px;margin-bottom:1.25rem;padding-bottom:10px;border-bottom:1px solid var(--border)}
.section-head h2{font-size:1.2rem}
.section-count{font-size:12px;font-weight:600;background:var(--bg);border:1px solid var(--border);border-radius:50px;padding:2px 10px;color:var(--muted)}
.calc-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:1rem}
.calc-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.25rem;display:flex;flex-direction:column;gap:6px;transition:all .15s;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.calc-card:hover{border-color:var(--accent);box-shadow:var(--shadow);transform:translateY(-1px)}
.card-cat{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.07em;color:var(--accent)}
.calc-card h3{font-size:1rem;color:var(--text);font-family:var(--serif)}
.calc-card p{font-size:13px;color:var(--muted);line-height:1.5;flex:1}
.card-arrow{color:var(--faint);margin-top:6px;font-size:18px;transition:all .15s}
.calc-card:hover .card-arrow{color:var(--accent);transform:translateX(3px)}

/* ── CALC PAGE ── */
.breadcrumb{display:flex;align-items:center;gap:8px;padding:14px 1.5rem;font-size:13px;color:var(--muted);max-width:1140px;margin:0 auto}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb span:last-child{color:var(--text);font-weight:500}
.page-inner{max-width:1140px;margin:0 auto;padding:0 1.5rem 4rem;display:grid;grid-template-columns:1fr 280px;gap:2rem;align-items:start}
.page-cat{display:inline-block;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.07em;color:var(--accent);background:var(--accent-light);padding:4px 10px;border-radius:6px;margin-bottom:12px}
.page-header h1{font-size:clamp(1.6rem,3vw,2.2rem);margin-bottom:10px}
.page-header p{font-size:1.05rem;color:var(--muted);max-width:540px;margin-bottom:1.5rem}

/* ── WIDGET ── */
.widget{background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow);margin-bottom:1.5rem}
.widget-inputs{padding:1.5rem}
.ci-group{margin-bottom:14px}
.ci-label{display:block;font-size:13px;font-weight:500;color:var(--muted);margin-bottom:6px}
.ci-hint{display:block;font-size:12px;color:var(--faint);margin-top:4px}
.ci-input{width:100%;padding:10px 14px;border:1px solid var(--border);border-radius:var(--radius);font-size:15px;color:var(--text);background:var(--bg);outline:none;font-family:var(--sans);transition:border-color .15s}
.ci-input:focus{border-color:var(--accent)}
.ci-row{display:flex;gap:12px}
.ci-row .ci-group{flex:1}
.ci-btn{width:100%;padding:12px;background:var(--accent);color:#fff;border:none;border-radius:var(--radius);font-size:15px;font-weight:600;cursor:pointer;font-family:var(--sans);transition:background .15s;margin-top:4px}
.ci-btn:hover{background:var(--accent-h)}
.ci-result{margin-top:14px;padding:14px 16px;background:var(--accent-light);border-radius:var(--radius);border-left:3px solid var(--accent);display:none}
.ci-result.show{display:block;animation:fadeUp .25s ease}
@keyframes fadeUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.ci-result-label{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.07em;color:var(--accent);margin-bottom:4px}
.ci-result-value{font-family:var(--mono);font-size:1.5rem;font-weight:500;color:var(--accent)}
.ci-result-detail{font-size:13px;color:var(--muted);margin-top:6px}

/* ── TABS ── */
.tabs{border-top:1px solid var(--border)}
.tab-bar{display:flex;border-bottom:1px solid var(--border)}
.tab-btn{flex:1;padding:10px 8px;background:transparent;border:none;font-size:13px;font-weight:500;color:var(--muted);border-bottom:2px solid transparent;cursor:pointer;font-family:var(--sans);transition:all .12s;margin-bottom:-1px}
.tab-btn:hover{color:var(--text)}
.tab-btn.active{color:var(--accent);border-bottom-color:var(--accent)}
.tab-pane{display:none;padding:1.25rem 1.5rem}
.tab-pane.active{display:block}
.formula-block{background:#1C1917;border-radius:var(--radius);padding:14px 16px;margin-bottom:10px;overflow-x:auto}
.formula-block code{font-family:var(--mono);font-size:13px;color:#86EFAC;white-space:pre}
.formula-desc{font-size:13px;color:var(--muted);line-height:1.6}
.sheets-wrap{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:10px 14px;margin-bottom:10px;display:flex;align-items:center;justify-content:space-between;gap:8px}
.sheets-label{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin-bottom:4px}
.sheets-code{font-family:var(--mono);font-size:13px;color:var(--text);flex:1}
.copy-btn{flex-shrink:0;font-size:11px;padding:4px 10px;border-radius:6px;border:1px solid var(--border);background:#fff;color:var(--muted);cursor:pointer;font-family:var(--sans);transition:all .12s}
.copy-btn:hover{border-color:var(--accent);color:var(--accent)}
.copy-btn.copied{background:var(--accent-light);color:var(--accent);border-color:var(--accent)}
.yt-link{display:flex;align-items:center;gap:12px;padding:12px 14px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);font-size:13px;color:var(--text);transition:border-color .15s;margin-bottom:8px}
.yt-link:hover{border-color:#FF0000}
.yt-icon{width:32px;height:22px;background:#FF0000;border-radius:6px;flex-shrink:0;position:relative}
.yt-icon::after{content:'';position:absolute;top:50%;left:55%;transform:translate(-50%,-50%);border-top:5px solid transparent;border-bottom:5px solid transparent;border-left:9px solid #fff}
.yt-link strong{display:block;font-weight:500;margin-bottom:2px}
.yt-link span{font-size:11px;color:var(--faint)}

/* ── FAQ ── */
.faqs{margin-bottom:2rem}
.faqs h2{font-size:1.3rem;margin-bottom:1rem}
.faq{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:8px;background:#fff}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;padding:13px 16px;background:transparent;border:none;font-size:15px;font-weight:500;color:var(--text);text-align:left;cursor:pointer;gap:12px;font-family:var(--sans)}
.faq-q:hover{background:var(--bg)}
.faq-q svg{flex-shrink:0;color:var(--muted);transition:transform .2s}
.faq.open .faq-q svg{transform:rotate(180deg)}
.faq-a{display:none;padding:0 16px 14px;font-size:14px;color:var(--muted);line-height:1.7;border-top:1px solid var(--border);padding-top:12px}
.faq.open .faq-a{display:block}

/* ── SIDEBAR ── */
.sidebar{position:sticky;top:80px}
.sidebar-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.25rem;margin-bottom:1rem}
.sidebar-title{font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:12px}
.sidebar-link{display:flex;align-items:center;justify-content:space-between;padding:9px 0;border-bottom:1px solid var(--border);font-size:14px;color:var(--text)}
.sidebar-link:last-child{border-bottom:none}
.sidebar-link:hover{color:var(--accent)}
.sidebar-tip{background:var(--accent-light);border-color:transparent}
.sidebar-tip p{font-size:13px;color:var(--muted);line-height:1.6}
.sidebar-tip strong{color:var(--accent)}

/* ── FOOTER ── */
.footer{background:var(--accent);color:rgba(255,255,255,.7);padding:2.5rem 0;text-align:center;margin-top:2rem}
.footer-logo{display:flex;align-items:center;justify-content:center;gap:10px;margin-bottom:8px;font-family:var(--serif);font-size:1.1rem;color:#fff}
.footer-logo-mark{width:28px;height:28px;background:rgba(255,255,255,.15);border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:15px}
.footer p{font-size:14px;margin-bottom:4px}
.footer-small{font-size:12px;color:rgba(255,255,255,.35);margin-top:8px}

/* ── RESPONSIVE ── */
@media(max-width:900px){.page-inner{grid-template-columns:1fr}.sidebar{position:static}}
@media(max-width:700px){.nav-links,.nav-all-btn{display:none}.hamburger{display:flex}.hero{padding:2.5rem 0 2rem}.hero-stats{gap:1.25rem}.calc-grid{grid-template-columns:1fr}}

/* ── Long-form SEO content ── */
.calc-content { margin-bottom: 2rem; }
.calc-content h2 { font-size: 1.3rem; margin: 1.5rem 0 0.75rem; color: var(--text); }
.calc-content p { font-size: 15px; color: var(--muted); line-height: 1.75; margin-bottom: 0.9rem; }
.calc-content h2:first-child { margin-top: 0; }