/* Birdiy Tools — shared stylesheet v2.0 (Aug 2026)
   Professional design pass: fluid type, refined palette, motion, a11y. */
:root{
  --green-950:#0c2e19;
  --green-900:#123f24;
  --green-800:#17552f;
  --green-700:#1e6b3c;
  --green-600:#268a4c;
  --green-500:#33a35e;
  --green-100:#e7f4ec;
  --green-50:#f2f9f4;
  --amber-500:#e8a13a;
  --amber-600:#c8842b;
  --amber-100:#fdf3e3;
  --ink:#182420;
  --ink-soft:#51615a;
  --line:#e2eae4;
  --bg:#ffffff;
  --bg-soft:#f6faf7;
  --radius:16px;
  --radius-sm:10px;
  --shadow-sm:0 1px 3px rgba(12,46,25,.07);
  --shadow:0 4px 16px rgba(12,46,25,.09);
  --shadow-lg:0 12px 32px rgba(12,46,25,.14);
  --maxw:1120px;
  --font:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.7;font-size:clamp(16px,1.5vw,17.5px);font-feature-settings:"cv02","cv03";text-rendering:optimizeLegibility}
img{max-width:100%;height:auto;display:block}
a{color:var(--green-700)}
:focus-visible{outline:3px solid var(--green-500);outline-offset:2px;border-radius:4px}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.skip-link{position:absolute;left:-999px;top:0;background:var(--green-900);color:#fff;padding:10px 18px;z-index:100;border-radius:0 0 10px 0}
.skip-link:focus{left:0}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}

/* ───── Header ───── */
.site-header{background:rgba(255,255,255,.92);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;min-height:68px;gap:12px}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none}
.brand img{width:44px;height:44px;object-fit:contain}
.brand-name{font-weight:800;font-size:1.3rem;color:var(--green-900);letter-spacing:-.02em;line-height:1.15;display:block}
.brand-tag{display:block;font-size:.6rem;font-weight:700;color:var(--green-600);letter-spacing:.18em;text-transform:uppercase}
.main-nav{display:flex;gap:2px;align-items:center;flex-wrap:wrap}
.main-nav a{text-decoration:none;color:var(--ink);font-weight:600;font-size:.94rem;padding:9px 14px;border-radius:99px;transition:background .18s,color .18s}
.main-nav a:hover{background:var(--green-100);color:var(--green-900)}
.main-nav a.nav-cta{background:var(--green-700);color:#fff;box-shadow:var(--shadow-sm)}
.main-nav a.nav-cta:hover{background:var(--green-900)}
.nav-toggle{display:none;background:#fff;border:1.5px solid var(--line);border-radius:10px;padding:8px 13px;font-size:1.15rem;cursor:pointer;color:var(--green-900)}
@media (max-width:860px){
  .nav-toggle{display:block}
  .main-nav{display:none;position:absolute;top:68px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:12px 20px 18px;box-shadow:var(--shadow-lg)}
  .main-nav.open{display:flex}
  .main-nav a{padding:13px 14px;font-size:1.02rem;border-radius:12px}
}

/* ───── Breadcrumb & headings ───── */
.breadcrumb{font-size:.83rem;color:var(--ink-soft);padding:18px 0 0}
.breadcrumb a{color:var(--ink-soft);text-decoration:none}
.breadcrumb a:hover{color:var(--green-700);text-decoration:underline}
.breadcrumb span[aria-current]{color:var(--ink);font-weight:600}
h1{font-size:clamp(1.75rem,4.5vw,2.6rem);line-height:1.12;color:var(--green-950);margin:16px 0 14px;letter-spacing:-.025em;font-weight:800}
h2{font-size:clamp(1.3rem,3vw,1.65rem);color:var(--green-900);margin:44px 0 14px;letter-spacing:-.015em;font-weight:750}
h3{font-size:1.13rem;color:var(--green-900);margin:24px 0 8px;font-weight:700}
p{margin:0 0 15px}
ul,ol{margin:0 0 18px 22px}
li{margin-bottom:8px}
.updated-line{font-size:.84rem;color:var(--ink-soft);margin:12px 0 4px}

/* ───── Answer capsule ───── */
.answer-capsule{background:linear-gradient(135deg,var(--green-50),var(--green-100));border:1px solid #d5eadd;border-left:5px solid var(--green-600);border-radius:6px var(--radius) var(--radius) 6px;padding:18px 22px;font-size:1.06rem;margin:8px 0 24px;box-shadow:var(--shadow-sm)}

/* ───── Tool box ───── */
.calc-box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:clamp(20px,3.5vw,30px);box-shadow:var(--shadow-lg);margin:20px 0 28px;position:relative}
.calc-box::before{content:"";position:absolute;inset:0 0 auto 0;height:5px;border-radius:var(--radius) var(--radius) 0 0;background:linear-gradient(90deg,var(--green-600),var(--green-500),var(--amber-500))}
.calc-box .field{margin-bottom:18px}
.calc-box label{display:block;font-weight:700;margin-bottom:7px;font-size:.92rem;letter-spacing:.01em}
.calc-box input,.calc-box select{width:100%;min-height:54px;font-size:1.06rem;font-family:var(--font);padding:10px 16px;border:1.5px solid #cfdcd4;border-radius:12px;background:var(--bg-soft);color:var(--ink);transition:border-color .15s,background .15s,box-shadow .15s;appearance:none}
.calc-box select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='9'%3E%3Cpath d='M1 1l6 6 6-6' stroke='%231e6b3c' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 16px center;padding-right:42px}
.calc-box input:focus,.calc-box select:focus{outline:none;border-color:var(--green-600);background:#fff;box-shadow:0 0 0 4px rgba(38,138,76,.13)}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media (max-width:560px){.field-row{grid-template-columns:1fr}}
.btn{display:inline-block;background:linear-gradient(135deg,var(--green-700),var(--green-800));color:#fff;border:none;border-radius:12px;min-height:54px;padding:14px 30px;font-size:1.04rem;font-weight:700;font-family:var(--font);cursor:pointer;text-decoration:none;text-align:center;letter-spacing:.01em;box-shadow:0 4px 14px rgba(30,107,60,.28);transition:transform .15s,box-shadow .15s,filter .15s}
.btn:hover{filter:brightness(1.07);transform:translateY(-1px);box-shadow:0 6px 20px rgba(30,107,60,.34)}
.btn:active{transform:translateY(0)}
.btn-secondary{background:#fff;color:var(--green-700);border:2px solid var(--green-600);box-shadow:none}
.btn-secondary:hover{background:var(--green-50);filter:none}
.segmented{display:flex;border:1.5px solid #cfdcd4;border-radius:12px;overflow:hidden;background:var(--bg-soft)}
.segmented button{flex:1;min-height:50px;border:none;background:transparent;font-size:.95rem;font-weight:600;font-family:var(--font);cursor:pointer;color:var(--ink-soft);transition:background .15s,color .15s;padding:8px 6px}
.segmented button.active{background:var(--green-700);color:#fff}
@media (max-width:560px){.segmented{flex-direction:column}.segmented button{min-height:46px}}

/* ───── Result ───── */
.result-box{display:none;background:linear-gradient(160deg,#fff, var(--green-50));border:1.5px solid var(--green-500);border-radius:var(--radius);padding:22px;margin-top:20px}
.result-box.show{display:block;animation:pop .3s cubic-bezier(.2,.9,.3,1.2)}
@keyframes pop{from{transform:translateY(6px) scale(.985);opacity:0}to{transform:none;opacity:1}}
.result-headline{font-size:1.18rem;font-weight:800;color:var(--green-950);margin-bottom:10px;letter-spacing:-.01em}
.result-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin:14px 0}
.result-stat{background:#fff;border:1px solid #d5eadd;border-radius:12px;padding:14px 12px;text-align:center;box-shadow:var(--shadow-sm)}
.result-stat .num{font-size:1.45rem;font-weight:800;color:var(--green-800);display:block;letter-spacing:-.02em;line-height:1.25}
.result-stat .lbl{font-size:.76rem;color:var(--ink-soft);font-weight:600;letter-spacing:.06em;text-transform:uppercase}
.result-note{font-size:.93rem;color:var(--ink-soft)}

/* ───── Formula ───── */
.formula{background:var(--green-50);border:1px dashed var(--green-500);border-radius:12px;padding:15px 18px;margin:12px 0;overflow-x:auto}
.formula code{font-family:ui-monospace,"SF Mono",Consolas,monospace;font-size:.96rem;color:var(--green-900)}

/* ───── Data table ───── */
.table-scroll{overflow-x:auto;margin:16px 0;border-radius:12px;box-shadow:var(--shadow-sm);border:1px solid var(--line)}
.data-table{width:100%;border-collapse:collapse;font-size:.94rem;min-width:560px}
.data-table th{background:var(--green-800);color:#fff;text-align:left;padding:12px 14px;font-weight:700;letter-spacing:.02em;position:sticky;top:0}
.data-table td{padding:10px 14px;border-bottom:1px solid var(--line)}
.data-table tr:last-child td{border-bottom:none}
.data-table tr:nth-child(even) td{background:var(--bg-soft)}
.data-table tr:hover td{background:var(--green-100)}

/* ───── FAQ ───── */
details.faq{border:1px solid var(--line);border-radius:12px;margin-bottom:10px;background:#fff;box-shadow:var(--shadow-sm);transition:box-shadow .15s}
details.faq:hover{box-shadow:var(--shadow)}
details.faq summary{cursor:pointer;font-weight:700;padding:16px 18px;list-style:none;position:relative;padding-right:44px;font-size:.99rem}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";position:absolute;right:18px;top:50%;transform:translateY(-50%);font-size:1.5rem;font-weight:400;color:var(--green-600);transition:transform .2s}
details.faq[open] summary::after{content:"+";transform:translateY(-50%) rotate(45deg)}
details.faq .faq-a{padding:0 18px 16px;color:var(--ink-soft)}

/* ───── Cards ───── */
.grid-3{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px;margin:20px 0}
.tool-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;gap:9px;text-decoration:none;color:var(--ink);transition:transform .18s,box-shadow .18s,border-color .18s;position:relative;overflow:hidden}
.tool-card:hover{transform:translateY(-4px);border-color:var(--green-500);box-shadow:var(--shadow-lg)}
.tool-card .emoji{font-size:1.55rem;width:52px;height:52px;display:flex;align-items:center;justify-content:center;background:var(--green-100);border-radius:14px}
.tool-card h3{margin:2px 0 0;color:var(--green-950);font-size:1.09rem;letter-spacing:-.01em}
.tool-card p{font-size:.9rem;color:var(--ink-soft);margin:0;line-height:1.6}
.tool-card .soon{display:inline-block;background:var(--amber-100);color:#8a5a12;font-size:.73rem;font-weight:800;letter-spacing:.05em;text-transform:uppercase;border-radius:99px;padding:4px 12px;width:max-content;margin-top:auto}
.tool-card .go{margin-top:auto;font-weight:700;color:var(--green-700);font-size:.9rem;transition:transform .18s;display:inline-block}
.tool-card:hover .go{transform:translateX(4px)}

/* ───── Affiliate picks ───── */
.picks{background:linear-gradient(150deg,var(--amber-100),#fbf7ee);border:1px solid #f0dfc0;border-radius:var(--radius);padding:clamp(20px,3vw,28px);margin:30px 0}
.picks h2,.picks h3{margin-top:0}
.picks-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(215px,1fr));gap:14px;margin-top:14px}
.pick{background:#fff;border-radius:12px;padding:18px;display:flex;flex-direction:column;gap:6px;box-shadow:var(--shadow-sm);border:1px solid #f0e6d2}
.pick .pick-tag{font-size:.7rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--amber-600)}
.pick strong{color:var(--ink);font-size:1.01rem}
.pick p{font-size:.85rem;color:var(--ink-soft);margin:0;line-height:1.55}
.pick a.btn{min-height:46px;padding:11px 16px;font-size:.9rem;margin-top:10px;background:linear-gradient(135deg,var(--amber-500),var(--amber-600));box-shadow:0 3px 10px rgba(200,132,43,.3)}
.disclosure{font-size:.77rem;color:var(--ink-soft);margin-top:14px}

/* ───── CTA banner ───── */
.cta-banner{background:linear-gradient(135deg,var(--green-900),var(--green-700));color:#fff;border-radius:var(--radius);padding:clamp(22px,3vw,30px);margin:34px 0;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;box-shadow:var(--shadow)}
.cta-banner p{margin:0;font-size:1.07rem;font-weight:500;max-width:560px}
.cta-banner a{background:#fff;color:var(--green-900);border-radius:12px;padding:13px 24px;font-weight:700;text-decoration:none;white-space:nowrap;transition:transform .15s,box-shadow .15s}
.cta-banner a:hover{transform:translateY(-1px);box-shadow:0 6px 16px rgba(0,0,0,.2)}

/* ───── Ad slots (reserved height = zero CLS) ───── */
/* Ad containers: invisible until a real ad fills them (no empty grey boxes). */
.ad-slot{margin:26px 0;display:block;min-height:0;text-align:center;overflow:hidden}
.ad-slot:empty{display:none;margin:0}
.ad-slot ins{display:block}

/* ───── Hero (homepage) ───── */
.hero{position:relative;background:linear-gradient(155deg,var(--green-950) 0%,var(--green-800) 55%,var(--green-700) 100%);color:#fff;padding:clamp(56px,9vw,96px) 0 clamp(48px,7vw,80px);text-align:center;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 300px at 78% 18%,rgba(232,161,58,.22),transparent 65%),radial-gradient(500px 260px at 12% 85%,rgba(51,163,94,.25),transparent 60%);pointer-events:none}
.hero .container{position:relative}
.hero .eyebrow{display:inline-block;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.22);border-radius:99px;padding:6px 16px;font-size:.78rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:#ffe9c8;margin-bottom:18px}
.hero h1{color:#fff;margin:0 auto 16px;max-width:800px}
.hero p{max-width:660px;margin:0 auto 28px;font-size:clamp(1rem,2vw,1.16rem);color:#d8ecdf}
.hero .btn{background:linear-gradient(135deg,var(--amber-500),var(--amber-600));box-shadow:0 6px 22px rgba(0,0,0,.3);font-size:1.08rem;padding:16px 34px}
.hero .hero-meta{margin-top:22px;font-size:.85rem;color:#a9cdb6;display:flex;gap:22px;justify-content:center;flex-wrap:wrap}
.hero .hero-meta span{display:flex;align-items:center;gap:7px}
.section{padding:clamp(36px,6vw,60px) 0}
.section-soft{background:var(--bg-soft)}
.section h2{margin-top:0}
.section .lead{color:var(--ink-soft);max-width:700px;font-size:1.04rem}

/* ───── Footer ───── */
.site-footer{background:var(--green-950);color:#c4dccd;margin-top:60px;padding:44px 0 28px;font-size:.92rem}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:28px}
.site-footer h4{color:#fff;margin-bottom:12px;font-size:.98rem;letter-spacing:.01em}
.site-footer a{color:#c4dccd;text-decoration:none;display:block;padding:4px 0;transition:color .15s}
@media (max-width:860px){.site-footer a{padding:11px 0}.footer-grid{gap:18px}}
.site-footer a:hover{color:#fff;text-decoration:underline}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:30px;padding-top:18px;text-align:center;font-size:.79rem;color:#8fb39c}