/* VHL Kit — CSS dùng chung cho các tiện ích (app.html) trên vuhuyenlinh.com
   Nhúng: <link rel="stylesheet" href="/tien-ich/_kit/vhl-kit.css"> */
@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;500;600;700&family=Noto+Serif:wght@600;700&display=swap');

:root{
  --brand:#e5397f;--brand-600:#c9246a;--brand-50:#fdf0f5;--brand-100:#fbe0eb;
  --ink:#1d1b22;--ink-2:#4a4652;--ink-3:#77727f;--line:#ece7ee;
  --bg:#fff;--bg-soft:#faf8fa;--radius:16px;
  --shadow:0 1px 2px #1d1b220a,0 8px 24px #1d1b220f;
  --font-head:"Noto Serif",Georgia,serif;
  --font-body:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
  --ok:#1f9d6b;--warn:#c98a12;--bad:#d1435b;
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font:400 16px/1.65 var(--font-body);-webkit-font-smoothing:antialiased}
.vhl-app{max-width:880px;margin:0 auto;padding:20px 16px 32px}
.vhl-app h1,.vhl-app h2,.vhl-app h3{font-family:var(--font-head);line-height:1.3;margin:0 0 .5em}
.vhl-app h2{font-size:1.35rem}.vhl-app h3{font-size:1.1rem}
.vhl-muted{color:var(--ink-3);font-size:.92rem}
.vhl-card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.vhl-card+.vhl-card{margin-top:16px}
.vhl-soft{background:var(--bg-soft);border-radius:12px;padding:14px 16px}
.vhl-grid{display:grid;gap:14px}
.vhl-grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.vhl-grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
@media (max-width:640px){.vhl-grid-2,.vhl-grid-3{grid-template-columns:1fr}}

/* Form */
.vhl-field{display:flex;flex-direction:column;gap:6px}
.vhl-field label,.vhl-label{font-weight:600;font-size:.92rem;color:var(--ink-2)}
.vhl-input,.vhl-select,.vhl-textarea{width:100%;font:inherit;color:var(--ink);background:#fff;border:1.5px solid var(--line);border-radius:12px;padding:11px 14px;outline:none;transition:border-color .15s,box-shadow .15s}
.vhl-input:focus,.vhl-select:focus,.vhl-textarea:focus{border-color:var(--brand);box-shadow:0 0 0 4px var(--brand-50)}
.vhl-textarea{min-height:90px;resize:vertical}
.vhl-seg{display:inline-flex;background:var(--bg-soft);border:1px solid var(--line);border-radius:999px;padding:4px;gap:4px;flex-wrap:wrap}
.vhl-seg button{border:0;background:transparent;font:inherit;font-weight:600;font-size:.92rem;color:var(--ink-2);padding:8px 16px;border-radius:999px;cursor:pointer}
.vhl-seg button[aria-pressed="true"]{background:#fff;color:var(--brand-600);box-shadow:var(--shadow)}

/* Buttons */
.vhl-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:inherit;font-weight:600;border-radius:999px;padding:12px 22px;border:1.5px solid transparent;cursor:pointer;text-decoration:none;transition:transform .08s,background .15s}
.vhl-btn:active{transform:scale(.98)}
.vhl-btn-primary{background:var(--brand);color:#fff}
.vhl-btn-primary:hover{background:var(--brand-600)}
.vhl-btn-ghost{background:#fff;color:var(--brand-600);border-color:var(--brand-100)}
.vhl-btn-ghost:hover{background:var(--brand-50)}
.vhl-btn[disabled]{opacity:.5;cursor:not-allowed}
.vhl-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}

/* Result */
.vhl-result{border-radius:var(--radius);background:linear-gradient(135deg,var(--brand-50),#fff 70%);border:1px solid var(--brand-100);padding:22px}
.vhl-big{font-family:var(--font-head);font-size:2.2rem;font-weight:700;color:var(--brand-600);line-height:1.15}
.vhl-badge{display:inline-block;background:var(--brand-50);color:var(--brand-600);font-weight:600;font-size:.8rem;border-radius:999px;padding:3px 10px}
.vhl-table{width:100%;border-collapse:collapse;font-size:.95rem}
.vhl-table td,.vhl-table th{padding:9px 6px;border-bottom:1px solid var(--line);text-align:left}
.vhl-table td:last-child,.vhl-table th:last-child{text-align:right;font-variant-numeric:tabular-nums}
.vhl-note{font-size:.85rem;color:var(--ink-3);margin-top:12px}
.vhl-hidden{display:none!important}

/* Streak + toast */
.vhl-streak{display:inline-flex;align-items:center;gap:6px;font-size:.85rem;font-weight:600;color:var(--brand-600);background:var(--brand-50);border-radius:999px;padding:4px 12px}
.vhl-toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%) translateY(20px);background:var(--brand);color:#fff;padding:10px 18px;border-radius:999px;font-size:.9rem;opacity:0;transition:.25s;pointer-events:none;z-index:99}
.vhl-toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* Related */
.vhl-related{margin-top:28px}
.vhl-related h3{font-size:1.05rem}
.vhl-related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
@media (max-width:640px){.vhl-related-grid{grid-template-columns:1fr}}
.vhl-related a{display:block;text-decoration:none;color:var(--ink);border:1px solid var(--line);border-radius:14px;padding:14px;background:#fff;transition:border-color .15s,transform .15s}
.vhl-related a:hover{border-color:var(--brand-100);transform:translateY(-2px)}
.vhl-related b{display:block;font-size:.95rem;margin:4px 0 2px}
.vhl-related span{font-size:.82rem;color:var(--ink-3)}
.vhl-related i{font-style:normal;font-size:.75rem;font-weight:600;color:var(--brand-600)}
.vhl-disclaimer{font-size:.8rem;color:var(--ink-3);text-align:center;margin-top:22px}

/* Bảng chia sẻ (VHL.shareCard / VHL.shareLink): hộp giữa màn hình trên desktop, bottom sheet trên mobile */
.vhl-share{position:fixed;inset:0;z-index:98;display:flex;align-items:center;justify-content:center;padding:16px;background:rgba(255,245,249,.85);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);animation:vhlShareFade .18s ease-out}
.vhl-share-panel{position:relative;width:100%;max-width:780px;max-height:100%;overflow:auto;overscroll-behavior:contain;background:#fff;border:1px solid var(--brand-100);border-radius:22px;box-shadow:0 2px 6px #c9246a14,0 24px 60px #c9246a24;padding:18px 20px 20px;animation:vhlShareUp .22s ease-out}
.vhl-share-linkonly .vhl-share-panel{max-width:460px}
.vhl-share-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}
.vhl-share-head h2{margin:0;font-family:var(--font-head);font-size:1.2rem;color:var(--ink)}
.vhl-share-x{flex:none;width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:#fff;color:var(--ink-2);font:400 26px/1 var(--font-body);cursor:pointer;display:grid;place-items:center;padding:0 0 3px}
.vhl-share-x:hover{background:var(--brand-50);color:var(--brand-600);border-color:var(--brand-100)}
.vhl-share-body{display:grid;grid-template-columns:minmax(0,300px) minmax(0,1fr);gap:22px;align-items:start}
.vhl-share-linkonly .vhl-share-body{grid-template-columns:1fr}
.vhl-share-left{display:flex;flex-direction:column;gap:12px;min-width:0}
.vhl-share-seg{display:flex;width:100%}
.vhl-share-seg button{flex:1;padding:8px 10px;font-size:.85rem}
.vhl-share-prev{position:relative;display:flex;align-items:center;justify-content:center;height:360px;background:var(--bg-soft);border:1px solid var(--line);border-radius:14px;overflow:hidden;padding:10px}
.vhl-share-prev img{display:block;height:100%;width:auto;max-width:100%;object-fit:contain;border-radius:8px;box-shadow:0 4px 16px #1d1b221a}
.vhl-share-prev[aria-busy="true"] img{opacity:.35}
.vhl-share-spin{position:absolute;font-size:.85rem;color:var(--ink-3)}
.vhl-share-prev[aria-busy="false"] .vhl-share-spin{display:none}
.vhl-share-tip{margin:0 0 14px;font-size:.92rem;color:var(--ink-2)}
.vhl-share-btns{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.vhl-share-b{display:flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:10px 12px;border-radius:14px;border:1.5px solid var(--brand-100);background:#fff;color:var(--brand-600);font:600 .92rem/1.2 var(--font-body);cursor:pointer;transition:background .15s,transform .08s}
.vhl-share-b:hover{background:var(--brand-50)}
.vhl-share-b:active{transform:scale(.98)}
.vhl-share-b:focus-visible,.vhl-share-x:focus-visible,.vhl-share-seg button:focus-visible{outline:3px solid #c9246a55;outline-offset:2px}
.vhl-share-main~.vhl-share-b:last-child:nth-child(even),.vhl-share-linkonly .vhl-share-b:last-child:nth-child(odd){grid-column:1/-1}
.vhl-share-main{grid-column:1/-1;background:#c9246a;border-color:#c9246a;color:#fff}
.vhl-share-main:hover{background:#b01d5c}
.vhl-share-url{display:flex;flex-direction:column;gap:6px;margin-top:14px;font-size:.8rem;font-weight:600;color:var(--ink-3)}
.vhl-share-url input{width:100%;font:400 .85rem var(--font-body);color:var(--ink-2);background:var(--bg-soft);border:1px solid var(--line);border-radius:10px;padding:9px 12px;outline:none}
.vhl-share-url input:focus{border-color:var(--brand)}
@keyframes vhlShareFade{from{opacity:0}to{opacity:1}}
@keyframes vhlShareUp{from{transform:translateY(16px);opacity:0}to{transform:none;opacity:1}}
@media (max-width:640px){
  .vhl-share{align-items:flex-end;padding:0}
  .vhl-share-panel{max-width:none;border-radius:22px 22px 0 0;border-bottom:0;padding:14px 16px calc(16px + env(safe-area-inset-bottom))}
  .vhl-share-panel::before{content:"";display:block;width:40px;height:4px;border-radius:4px;background:var(--line);margin:0 auto 10px}
  .vhl-share-body{grid-template-columns:1fr;gap:14px}
  .vhl-share-prev{height:min(36vh,280px)}
  .vhl-share-tip{display:none}
  .vhl-share-btns{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
  .vhl-share-b{flex-direction:column;gap:4px;min-height:64px;padding:8px 4px;font-size:.78rem}
  .vhl-share-main~.vhl-share-b:last-child:nth-child(even),.vhl-share-linkonly .vhl-share-b:last-child:nth-child(odd){grid-column:auto}
  .vhl-share-main{flex-direction:row;min-height:48px;font-size:.92rem}
  .vhl-share-url{margin-top:12px}
}
@media (prefers-reduced-motion:reduce){.vhl-share,.vhl-share-panel{animation:none}}