/* HasibaGulf — حاسبة الخليج — minimal mobile-first RTL stylesheet */
:root{
  --primary:#0e7a5f;
  --primary-dark:#0a4f3d;
  --primary-light:#e6f4ee;
  --bg:#f7faf9;
  --card:#ffffff;
  --text:#1d2b26;
  --muted:#5f7169;
  --border:#dfeae5;
  --warn:#b7791f;
  --warn-bg:#fdf6e3;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Segoe UI",Tahoma,"Noto Sans Arabic","Cairo",Arial,sans-serif;
  background:var(--bg);color:var(--text);line-height:1.9;font-size:17px;
}
.container{max-width:960px;margin:0 auto;padding:0 16px}
/* Header */
.site-header{background:var(--primary-dark);color:#fff;padding:12px 0;position:sticky;top:0;z-index:50;box-shadow:0 2px 8px rgba(0,0,0,.15)}
.site-header .container{display:flex;flex-wrap:wrap;align-items:center;gap:8px 20px}
.brand{color:#fff;text-decoration:none;font-weight:800;font-size:1.35rem}
.brand small{display:block;font-size:.72rem;font-weight:400;color:#cde6da;letter-spacing:.5px}
.main-nav{display:flex;flex-wrap:wrap;gap:4px 2px}
.main-nav a{color:#e8f3ee;text-decoration:none;font-size:.86rem;padding:6px 10px;border-radius:8px}
.main-nav a:hover{background:rgba(255,255,255,.14)}
/* Hero */
.hero{background:linear-gradient(135deg,var(--primary-dark),var(--primary));color:#fff;padding:44px 0;text-align:center}
.hero h1{font-size:1.9rem;margin-bottom:10px}
.hero p{color:#dcefe7;max-width:640px;margin:0 auto}
/* Tools grid */
.tools-grid{display:grid;grid-template-columns:1fr;gap:14px;margin:26px 0}
@media(min-width:640px){.tools-grid{grid-template-columns:1fr 1fr}}
.tool-card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:20px;text-decoration:none;color:var(--text);display:block;transition:transform .15s,box-shadow .15s}
.tool-card:hover{transform:translateY(-3px);box-shadow:0 8px 20px rgba(10,79,61,.12)}
.tool-card h2{font-size:1.15rem;color:var(--primary-dark);margin-bottom:6px}
.tool-card p{font-size:.92rem;color:var(--muted)}
.tool-card .go{display:inline-block;margin-top:10px;color:var(--primary);font-weight:700}
/* Calculator */
.calc{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:22px;margin:22px 0}
.calc h2{margin-bottom:14px;color:var(--primary-dark)}
.field{margin-bottom:14px}
.field label{display:block;font-weight:700;margin-bottom:6px}
.field input,.field select{width:100%;padding:12px;border:1.5px solid var(--border);border-radius:10px;font-size:1rem;font-family:inherit;background:#fff}
.field input:focus,.field select:focus{outline:none;border-color:var(--primary)}
.btn{display:inline-block;background:var(--primary);color:#fff;border:none;border-radius:10px;padding:12px 28px;font-size:1.05rem;font-weight:700;cursor:pointer;font-family:inherit}
.btn:hover{background:var(--primary-dark)}
.result{background:var(--primary-light);border:1px solid var(--primary);border-radius:12px;padding:18px;margin-top:18px;display:none}
.result.show{display:block}
.result h3{color:var(--primary-dark);margin-bottom:8px}
.result .big{font-size:1.6rem;font-weight:800;color:var(--primary-dark)}
.result table{width:100%;border-collapse:collapse;margin-top:10px}
.result table td{padding:8px;border-bottom:1px dashed var(--border)}
.result table td:last-child{font-weight:700;text-align:left}
.note{background:var(--warn-bg);border:1px solid #ecd9a0;border-radius:10px;padding:12px 16px;margin:18px 0;font-size:.92rem;color:#6b5416}
/* Article */
.article{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:24px;margin:22px 0}
.article h2{color:var(--primary-dark);margin:26px 0 10px;font-size:1.3rem}
.article h2:first-child{margin-top:0}
.article h3{color:var(--primary-dark);margin:20px 0 8px;font-size:1.1rem}
.article p{margin-bottom:14px}
.article ul,.article ol{margin:0 22px 14px 0}
.article li{margin-bottom:8px}
.article table{width:100%;border-collapse:collapse;margin:14px 0}
.article table th,.article table td{border:1px solid var(--border);padding:10px;text-align:right}
.article table th{background:var(--primary-light);color:var(--primary-dark)}
.page-title{margin:26px 0 6px;color:var(--primary-dark);font-size:1.7rem}
.page-sub{color:var(--muted);margin-bottom:6px}
/* FAQ */
.faq details{background:var(--card);border:1px solid var(--border);border-radius:10px;margin-bottom:10px;padding:14px 18px}
.faq summary{font-weight:700;cursor:pointer;color:var(--primary-dark)}
.faq details p{margin-top:8px;color:var(--text)}
/* Footer */
.site-footer{background:var(--primary-dark);color:#cfe5da;margin-top:40px;padding:30px 0 20px;font-size:.9rem}
.site-footer a{color:#fff;text-decoration:none}
.site-footer a:hover{text-decoration:underline}
.footer-links{display:flex;flex-wrap:wrap;gap:6px 18px;margin-bottom:12px}
.copy{border-top:1px solid rgba(255,255,255,.15);padding-top:12px;margin-top:12px;font-size:.82rem;color:#a9c8b9}