/* ===== Kids Worksheet Factory — global styles (mobile-first) ===== */
:root{
  --ink:#22223b; --ink-soft:#5c6070; --paper:#f8faff; --paper-2:#eef2fb;
  --brand:#4361ee; --brand-dark:#3147c4; --accent:#ff9f1c; --accent-dark:#e08500;
  --sage:#2ec4b6; --line:#dfe5f1; --card-r:18px; --shadow:0 6px 24px rgba(34,34,59,.10);
  --font-head:'Trebuchet MS','Segoe UI',Verdana,sans-serif;
  --font-body:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,'PingFang SC','Microsoft YaHei',sans-serif;
  --nav-h:60px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-body);color:var(--ink);background:var(--paper);line-height:1.65;font-size:16px}
img{max-width:100%;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--brand-dark)}
h1,h2,h3,h4{font-family:var(--font-head);line-height:1.25;color:var(--ink)}
.wrap{max-width:1180px;margin:0 auto;padding:0 18px}

/* ===== Header / Nav ===== */
.site-header{position:sticky;top:0;z-index:50;background:rgba(248,250,255,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:14px;height:var(--nav-h)}
.logo{font-family:var(--font-head);font-weight:700;font-size:1.12rem;color:var(--ink);display:flex;align-items:center;gap:8px;white-space:nowrap}
.logo .dot{width:11px;height:11px;border-radius:3px;background:var(--accent);display:inline-block;transform:rotate(12deg)}
.nav-links{display:flex;gap:4px;margin-left:auto;align-items:center;flex-wrap:wrap}
.nav-links a{color:var(--ink-soft);padding:8px 10px;border-radius:8px;font-size:.92rem;white-space:nowrap}
.nav-links a:hover{background:var(--paper-2);color:var(--ink)}
.nav-links a.active{color:var(--brand);font-weight:600}
.lang-switch{display:flex;border:1px solid var(--line);border-radius:999px;overflow:hidden;margin-left:6px}
.lang-switch button{border:0;background:transparent;padding:6px 12px;cursor:pointer;font-size:.85rem;color:var(--ink-soft)}
.lang-switch button.on{background:var(--brand);color:#fff}
.menu-toggle{display:none;margin-left:auto;border:1px solid var(--line);background:#fff;border-radius:8px;padding:8px 12px;cursor:pointer;font-size:1rem}

/* ===== Hero ===== */
.hero{position:relative;min-height:430px;display:flex;align-items:center;border-radius:0 0 30px 30px;overflow:hidden;color:#fff}
.hero .bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.55)}
.hero .inner{position:relative;padding:64px 0}
.hero h1{font-size:clamp(1.9rem,4.6vw,3.4rem);color:#fff;max-width:15em}
.hero p{font-size:clamp(1rem,1.6vw,1.2rem);max-width:44em;margin:16px 0 26px;color:#eef2fb}
.btn{display:inline-block;background:var(--brand);color:#fff;padding:12px 26px;border-radius:999px;font-weight:600;border:0;cursor:pointer;font-size:1rem}
.btn:hover{background:var(--brand-dark);color:#fff}
.btn.accent{background:var(--accent);color:#fff}
.btn.accent:hover{background:var(--accent-dark);color:#fff}
.btn.ghost{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.5)}
.btn.ghost:hover{background:rgba(255,255,255,.28)}
.btn.ghost-ink{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn.ghost-ink:hover{background:var(--paper-2);color:var(--ink)}

/* ===== Sections ===== */
.section{padding:56px 0}
.section.alt{background:var(--paper-2)}
.section h2{font-size:clamp(1.5rem,3vw,2.1rem);margin-bottom:8px}
.section .lead{color:var(--ink-soft);max-width:52em;margin-bottom:28px}
.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:.75rem;color:var(--brand);font-weight:700;margin-bottom:10px}

/* ===== Photo cards ===== */
.grid{display:grid;gap:20px;grid-template-columns:1fr}
@media(min-width:600px){.grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:960px){.grid{grid-template-columns:repeat(3,1fr)}}
@media(min-width:1200px){.grid.cols-4{grid-template-columns:repeat(4,1fr)}}
.pcard{position:relative;border-radius:var(--card-r);overflow:hidden;min-height:230px;display:flex;align-items:flex-end;color:#fff;box-shadow:var(--shadow);transform:translateZ(0);transition:transform .25s ease,box-shadow .25s ease}
.pcard:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(34,34,59,.18)}
.pcard .bg{position:absolute;inset:0;background-size:cover;background-position:center;transition:transform .5s ease}
.pcard:hover .bg{transform:scale(1.05)}
.pcard .scrim{position:absolute;inset:0;background:linear-gradient(180deg,rgba(20,22,40,0) 30%,rgba(20,22,40,.82) 100%)}
.pcard .body{position:relative;padding:18px 18px 16px;width:100%}
.pcard h3{color:#fff;font-size:1.12rem;margin-bottom:4px}
.pcard p{font-size:.86rem;color:#e4e8f4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.pcard .fav{position:absolute;top:10px;right:10px;z-index:2;border:0;background:rgba(255,255,255,.9);width:38px;height:38px;border-radius:50%;cursor:pointer;font-size:1.05rem;line-height:1;display:flex;align-items:center;justify-content:center;color:#8f94a8}
.pcard .fav.on{background:var(--accent);color:#fff}
.pcard .tag{position:absolute;top:12px;left:12px;z-index:2;background:rgba(67,97,238,.94);color:#fff;font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;padding:4px 10px;border-radius:999px}
.cat-head{display:flex;align-items:baseline;gap:14px;margin:44px 0 18px;flex-wrap:wrap}
.cat-head h3{font-size:1.4rem}
.cat-head span{color:var(--ink-soft);font-size:.9rem}

/* ===== Tool page layout ===== */
.tool-hero{position:relative;border-radius:22px;overflow:hidden;color:#fff;margin:26px 0;min-height:200px;display:flex;align-items:flex-end}
.tool-hero .bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.5)}
.tool-hero .body{position:relative;padding:30px}
.tool-hero h1{color:#fff;font-size:clamp(1.5rem,3.4vw,2.3rem)}
.tool-hero p{max-width:46em;color:#e9edf8;margin-top:8px}
.tool-grid{display:grid;gap:26px;grid-template-columns:1fr}
@media(min-width:980px){.tool-grid{grid-template-columns:400px 1fr}}
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--card-r);padding:22px;box-shadow:var(--shadow)}
.panel h3{font-size:1.05rem;margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.field{margin-bottom:14px}
.field label{display:block;font-size:.85rem;font-weight:600;margin-bottom:5px;color:var(--ink)}
.field select,.field input[type=text],.field input[type=number],.field textarea{width:100%;padding:9px 11px;border:1px solid var(--line);border-radius:9px;font:inherit;font-size:.92rem;background:#fff;color:var(--ink)}
.field textarea{min-height:90px;resize:vertical}
.checks{display:flex;flex-direction:column;gap:7px}
.checks label{display:flex;gap:8px;align-items:center;font-size:.9rem;font-weight:400;cursor:pointer}
.row-2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.hint{font-size:.78rem;color:var(--ink-soft);margin-top:4px}
.preview-box{background:var(--paper-2);border:1px dashed var(--line);border-radius:var(--card-r);padding:16px;display:flex;justify-content:center;align-items:flex-start;min-height:420px;overflow:auto}
.preview-box svg,.preview-box canvas{max-width:100%;height:auto;background:#fff;box-shadow:0 4px 18px rgba(0,0,0,.14)}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.tips{background:#fff;border:1px solid var(--line);border-left:4px solid var(--sage);border-radius:10px;padding:16px 18px;margin:26px 0;font-size:.92rem}
.tips h4{margin-bottom:6px;color:var(--sage)}
.tips ul{padding-left:20px}
.tips li{margin-bottom:4px}
.mini-btn{border:1px solid var(--line);background:#fff;border-radius:8px;padding:6px 9px;cursor:pointer;font-size:.82rem;color:var(--ink-soft);line-height:1;flex:none}
.mini-btn:hover{background:var(--paper-2);color:var(--ink)}
.mini-btn.on{background:var(--brand);color:#fff;border-color:var(--brand)}

/* ===== Article ===== */
.article-hero{position:relative;border-radius:22px;overflow:hidden;min-height:260px;display:flex;align-items:flex-end;margin:26px 0;color:#fff}
.article-hero .bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.48)}
.article-hero .body{position:relative;padding:30px}
.article-hero h1{color:#fff;font-size:clamp(1.5rem,3.2vw,2.3rem);max-width:20em}
.article-body{max-width:760px;margin:0 auto;padding:10px 0 40px;font-size:1.02rem}
.article-body h2{font-size:1.5rem;margin:34px 0 12px}
.article-body h3{font-size:1.2rem;margin:26px 0 10px}
.article-body p{margin-bottom:14px}
.article-body ul,.article-body ol{padding-left:22px;margin-bottom:14px}
.article-body li{margin-bottom:6px}
.article-body table{width:100%;border-collapse:collapse;margin:16px 0;font-size:.92rem}
.article-body th,.article-body td{border:1px solid var(--line);padding:8px 10px;text-align:left}
.article-body th{background:var(--paper-2)}
.meta{color:var(--ink-soft);font-size:.85rem;margin-top:8px}
.toc{background:var(--paper-2);border-radius:12px;padding:16px 20px;margin:20px 0;font-size:.92rem}
.toc a{color:var(--ink-soft)}
.related{margin-top:36px}

/* ===== Footer ===== */
.site-footer{background:#1d2033;color:#c9cede;margin-top:60px}
.site-footer .cols{display:grid;gap:26px;grid-template-columns:1fr;padding:44px 0}
@media(min-width:760px){.site-footer .cols{grid-template-columns:2fr 1fr 1fr 1fr}}
.site-footer h4{color:#fff;font-size:1rem;margin-bottom:12px;font-family:var(--font-body)}
.site-footer a{color:#c9cede;display:block;padding:3px 0;font-size:.9rem}
.site-footer a:hover{color:#fff}
.copyright{border-top:1px solid #33374f;padding:16px 0;font-size:.8rem;color:#8f94a8;text-align:center}

/* ===== Misc ===== */
.badge-free{display:inline-block;background:var(--sage);color:#fff;font-size:.7rem;padding:3px 10px;border-radius:999px;letter-spacing:.06em;text-transform:uppercase;vertical-align:middle;margin-left:8px}
.breadcrumb{font-size:.82rem;color:var(--ink-soft);margin:18px 0 0}
.breadcrumb a{color:var(--ink-soft)}
.notice-strip{background:#fff7e6;border:1px solid #ecd9a8;border-radius:10px;padding:12px 16px;font-size:.88rem;margin:16px 0}
.fav-empty{color:var(--ink-soft);font-size:.92rem;padding:14px;border:1px dashed var(--line);border-radius:10px}
.prose h2{margin:26px 0 10px}
.prose p,.prose li{font-size:.98rem}
.prose ul{padding-left:20px;margin-bottom:12px}
.prose li{margin-bottom:5px}
.chip{display:inline-block;background:var(--paper-2);border:1px solid var(--line);color:var(--ink-soft);font-size:.75rem;padding:3px 10px;border-radius:999px;margin:0 6px 6px 0}

/* ===== Mobile nav ===== */
@media(max-width:860px){
  .menu-toggle{display:block}
  .nav-links{display:none;position:absolute;top:var(--nav-h);left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:10px 16px 16px;box-shadow:var(--shadow)}
  .nav-links.open{display:flex}
  .nav-links a{padding:10px}
  .lang-switch{margin:8px 0 0;align-self:flex-start}
}
@media print{
  .site-header,.site-footer,.no-print{display:none!important}
}