/* =========================================================
   حاسبات - نظام التصميم المشترك
   Mobile-first, RTL, بدون مكتبات خارجية
========================================================= */

:root {
  --primary: #0f766e;
  --primary-dark: #0b5c56;
  --primary-light: #14b8a6;
  --accent: #f59e0b;
  --accent-dark: #d97706;

  --bg: #f7f9fa;
  --surface: #ffffff;
  --border: #e5e7eb;

  --text: #1f2937;
  --text-muted: #6b7280;
  --text-soft: #9ca3af;

  --success: #16a34a;
  --danger: #dc2626;

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 20px;

  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.12);

  --container: 1120px;
  --font: "Tajawal", "Segoe UI", Tahoma, Arial, sans-serif;

  /* ألوان مميزة لكل حاسبة */
  --c1: #0f766e; --c1-soft: #e6faf5;
  --c2: #2563eb; --c2-soft: #eaf1ff;
  --c3: #7c3aed; --c3-soft: #f3ecff;
  --c4: #db2777; --c4-soft: #fdedf5;
  --c5: #d97706; --c5-soft: #fef3e2;
  --c6: #0891b2; --c6-soft: #e6f8fb;
  --c7: #e11d48; --c7-soft: #fdecef;
  --c8: #4f46e5; --c8-soft: #edecfd;
  --c9: #65a30d; --c9-soft: #f1f8e6;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes floatBlob {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-14px, 12px) scale(1.05); }
}
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { margin: 0 0 .5em; line-height: 1.35; font-weight: 800; }
p { margin: 0 0 1em; color: var(--text); }

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 18px;
}

/* ===== Skip link ===== */
.skip-link {
  position: absolute;
  right: -999px;
  top: 0;
  background: var(--primary);
  color: #fff;
  padding: 10px 16px;
  border-radius: 0 0 0 8px;
  z-index: 1000;
}
.skip-link:focus { right: 0; }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: box-shadow .2s, border-color .2s;
}
.site-header.scrolled {
  border-color: var(--border);
  box-shadow: 0 4px 20px rgba(15, 23, 42, .06);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 66px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--primary-dark);
}
.brand .brand-mark {
  width: 34px;
  height: 34px;
  flex: none;
  filter: drop-shadow(0 4px 10px rgba(15, 118, 110, .35));
}
.main-nav {
  display: none;
  gap: 6px;
}
.main-nav a {
  padding: 9px 14px;
  border-radius: 999px;
  color: var(--text-muted);
  font-weight: 600;
  font-size: .95rem;
  transition: background .15s, color .15s;
}
.main-nav a:hover,
.main-nav a[aria-current="page"] {
  background: #ecfaf7;
  color: var(--primary-dark);
}
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  cursor: pointer;
}
.nav-toggle svg { width: 20px; height: 20px; }

@media (min-width: 900px) {
  .main-nav { display: flex; }
  .nav-toggle { display: none; }
}

.mobile-menu {
  display: none;
  border-top: 1px solid var(--border);
  background: var(--surface);
}
.mobile-menu.open { display: block; }
.mobile-menu a {
  display: block;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  color: var(--text);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: 64px 0 40px;
  text-align: center;
  overflow: hidden;
  isolation: isolate;
}
.hero::before,
.hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  border-radius: 50%;
  filter: blur(50px);
  opacity: .35;
  animation: floatBlob 10s ease-in-out infinite;
}
.hero::before {
  width: 340px;
  height: 340px;
  top: -140px;
  right: -60px;
  background: radial-gradient(circle, var(--primary-light), transparent 70%);
}
.hero::after {
  width: 300px;
  height: 300px;
  bottom: -160px;
  left: -60px;
  background: radial-gradient(circle, var(--accent), transparent 70%);
  animation-delay: -5s;
}
.hero .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #ecfaf7;
  color: var(--primary-dark);
  font-size: .82rem;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
  animation: fadeInUp .5s ease both;
}
.hero h1 {
  font-size: clamp(1.8rem, 4.5vw, 2.9rem);
  color: var(--text);
  animation: fadeInUp .5s ease .05s both;
}
.hero p {
  color: var(--text-muted);
  max-width: 640px;
  margin-inline: auto;
  font-size: 1.1rem;
  animation: fadeInUp .5s ease .1s both;
}

.trust-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 26px;
  animation: fadeInUp .5s ease .18s both;
}
.trust-bar span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 600;
  color: var(--text-muted);
  box-shadow: var(--shadow-sm);
}
.trust-bar svg { width: 16px; height: 16px; color: var(--primary); flex: none; }

/* ===== Calculator grid (homepage) ===== */
.category-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 26px;
}
.category-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-family: var(--font);
  font-size: .88rem;
  font-weight: 700;
  padding: 8px 16px;
  border-radius: 999px;
  cursor: pointer;
  transition: border-color .15s, color .15s, background .15s;
}
.category-btn span {
  font-size: .74rem;
  font-weight: 700;
  background: rgba(0,0,0,.06);
  padding: 1px 7px;
  border-radius: 999px;
}
.category-btn:hover { border-color: var(--primary-light); color: var(--primary-dark); }
.category-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.category-btn.active span { background: rgba(255,255,255,.22); }

.tools-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding-block: 20px 20px;
}
.tools-grid .tool-card.hidden { display: none; }
@media (min-width: 640px) {
  .tools-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 980px) {
  .tools-grid { grid-template-columns: repeat(3, 1fr); }
}

.tool-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
  animation: fadeInUp .5s ease both;
}
.tool-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--card-accent, var(--primary)), transparent);
  opacity: 0;
  transition: opacity .2s ease;
}
.tool-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.tool-card:hover::before { opacity: 1; }
.tool-card .icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--card-accent-soft, #ecfaf7);
  color: var(--card-accent, var(--primary));
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform .2s ease;
}
.tool-card:hover .icon { transform: scale(1.08) rotate(-4deg); }
.tool-card .icon svg { width: 24px; height: 24px; }
.tool-card h3 { font-size: 1.08rem; margin-bottom: 2px; }
.tool-card p { color: var(--text-muted); font-size: .92rem; margin-bottom: 0; flex: 1; }
.tool-card .cta {
  margin-top: 6px;
  font-weight: 700;
  font-size: .9rem;
  color: var(--card-accent, var(--primary-dark));
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap .15s ease;
}
.tool-card:hover .cta { gap: 8px; }
.tool-card.soon {
  opacity: .65;
  pointer-events: none;
}
.tool-card.c1 { --card-accent: var(--c1); --card-accent-soft: var(--c1-soft); }
.tool-card.c2 { --card-accent: var(--c2); --card-accent-soft: var(--c2-soft); }
.tool-card.c3 { --card-accent: var(--c3); --card-accent-soft: var(--c3-soft); }
.tool-card.c4 { --card-accent: var(--c4); --card-accent-soft: var(--c4-soft); }
.tool-card.c5 { --card-accent: var(--c5); --card-accent-soft: var(--c5-soft); }
.tool-card.c6 { --card-accent: var(--c6); --card-accent-soft: var(--c6-soft); }
.tool-card.c7 { --card-accent: var(--c7); --card-accent-soft: var(--c7-soft); }
.tool-card.c8 { --card-accent: var(--c8); --card-accent-soft: var(--c8-soft); }
.tool-card.c9 { --card-accent: var(--c9); --card-accent-soft: var(--c9-soft); }
.tools-grid .tool-card:nth-child(1) { animation-delay: .02s; }
.tools-grid .tool-card:nth-child(2) { animation-delay: .07s; }
.tools-grid .tool-card:nth-child(3) { animation-delay: .12s; }
.tools-grid .tool-card:nth-child(4) { animation-delay: .17s; }
.tools-grid .tool-card:nth-child(5) { animation-delay: .22s; }
.tools-grid .tool-card:nth-child(6) { animation-delay: .27s; }
.badge-soon {
  align-self: flex-start;
  background: #fff7ed;
  color: var(--accent-dark);
  font-size: .72rem;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 999px;
}

/* ===== Calculator tool box (calculator pages) ===== */
.calc-wrap {
  padding: 22px 0 8px;
}
.calc-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 22px;
  animation: fadeInUp .45s ease both;
}
@media (min-width: 640px) {
  .calc-box { padding: 32px; }
}

.breadcrumb {
  font-size: .85rem;
  color: var(--text-soft);
  padding-top: 16px;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary-dark); }

.field {
  margin-bottom: 16px;
}
.field label {
  display: block;
  font-weight: 700;
  font-size: .92rem;
  margin-bottom: 6px;
  color: var(--text);
}
.hint {
  font-size: .8rem;
  color: var(--text-soft);
  margin-top: 4px;
}
.hint.status-error { color: var(--danger); font-weight: 600; }
.input-group {
  position: relative;
  display: flex;
  align-items: center;
}
.field input[type="number"],
.field input[type="text"],
.field input[type="date"],
.field select {
  width: 100%;
  padding: 13px 14px;
  font-size: 1rem;
  font-family: var(--font);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: #fbfcfc;
  color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(20, 184, 166, .15);
  background: #fff;
}
.input-group .suffix {
  position: absolute;
  left: 14px;
  color: var(--text-soft);
  font-size: .88rem;
  font-weight: 600;
  pointer-events: none;
}

.form-warning {
  display: none;
  background: #fff7ed;
  color: var(--accent-dark);
  border: 1px solid #fed7aa;
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: .85rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: -6px 0 18px;
}
.preset-btn {
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-family: var(--font);
  font-size: .82rem;
  font-weight: 600;
  padding: 7px 13px;
  border-radius: 999px;
  cursor: pointer;
  transition: border-color .15s, color .15s, background .15s;
}
.preset-btn:hover {
  border-color: var(--primary-light);
  color: var(--primary-dark);
  background: #ecfaf7;
}

.swap-row {
  display: flex;
  align-items: end;
  gap: 10px;
}
.swap-row .field { flex: 1; margin-bottom: 0; }
.swap-btn {
  flex: none;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .15s, transform .2s;
}
.swap-btn:hover { background: #ecfaf7; transform: rotate(180deg); }
.swap-btn svg { width: 20px; height: 20px; }
@media (max-width: 480px) {
  .swap-row { flex-direction: column; align-items: stretch; }
  .swap-btn { align-self: center; }
}

.field-checkbox {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #fbfcfc;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 13px 14px;
}
.field-checkbox input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--primary);
  flex: none;
}
.field-checkbox label {
  font-weight: 600;
  font-size: .92rem;
  color: var(--text);
  cursor: pointer;
}

.calc-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px 20px;
}
@media (min-width: 640px) {
  .calc-grid { grid-template-columns: 1fr 1fr; }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  cursor: pointer;
  font-family: var(--font);
  font-weight: 700;
  font-size: 1rem;
  border-radius: var(--radius-sm);
  padding: 14px 22px;
  transition: background .15s, transform .1s;
}
.btn:active { transform: scale(.98); }
.btn-primary {
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  color: #fff;
  width: 100%;
  box-shadow: 0 8px 20px rgba(15, 118, 110, .28);
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  box-shadow: 0 10px 24px rgba(15, 118, 110, .38);
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--primary-dark);
  border: 1.5px solid var(--border);
}

.result-box {
  position: relative;
  margin-top: 22px;
  padding: 22px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, #14b8a6, #0f766e 55%, #0b5c56);
  color: #fff;
  display: none;
  overflow: hidden;
  box-shadow: 0 14px 30px rgba(11, 92, 86, .3);
}
.result-box::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 100% 0%, rgba(255,255,255,.18), transparent 55%);
  pointer-events: none;
}
.result-box.show { display: block; animation: fadeInUp .4s ease both; }
.result-box .label {
  font-size: .85rem;
  opacity: .85;
  font-weight: 600;
}
.result-box .value {
  font-size: 2rem;
  font-weight: 800;
  margin-top: 4px;
}
.result-breakdown {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}
.result-breakdown .item {
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.16);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
}
.result-breakdown .item .k { font-size: .78rem; opacity: .85; }
.result-breakdown .item .v { font-size: 1.05rem; font-weight: 700; margin-top: 2px; }
.result-breakdown .item .v.status-ok { color: #86efac; }
.result-breakdown .item .v.status-warn { color: #fde68a; }
.result-breakdown .item .v.status-danger { color: #fca5a5; }

/* ===== Ad slots ===== */
.ad-slot {
  margin: 28px auto;
  max-width: var(--container);
  padding-inline: 18px;
}
.ad-slot .ad-inner {
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  background: #fbfcfc;
  color: var(--text-soft);
  font-size: .75rem;
}
.ad-slot .ad-label {
  text-align: center;
  font-size: .68rem;
  color: var(--text-soft);
  letter-spacing: .04em;
  margin-bottom: 6px;
}

/* ===== Article ===== */
.article {
  max-width: 760px;
  margin: 0 auto;
  padding: 12px 0 20px;
}
.article h2 {
  font-size: 1.35rem;
  margin-top: 1.6em;
  color: var(--text);
}
.article h2:first-child { margin-top: 0; }
.article h3 { font-size: 1.1rem; margin-top: 1.3em; }
.article p, .article li { color: var(--text-muted); font-size: 1rem; }
.article ul, .article ol { padding-inline-start: 22px; margin-bottom: 1em; }
.article li { margin-bottom: 6px; }
.article strong { color: var(--text); }
.example-box {
  background: #ecfaf7;
  border-inline-start: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  margin: 1.2em 0;
}
.example-box p:last-child { margin-bottom: 0; }

.faq details {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin-bottom: 10px;
  background: var(--surface);
}
.faq summary {
  font-weight: 700;
  cursor: pointer;
  font-size: 1rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-size: 1.3rem;
  color: var(--primary);
  font-weight: 400;
  flex: none;
  margin-inline-start: 12px;
}
.faq details[open] summary::after { content: "−"; }
.faq p { margin-top: 10px; margin-bottom: 0; color: var(--text-muted); }

/* ===== Static pages (about/privacy/contact) ===== */
.page {
  max-width: 760px;
  margin: 0 auto;
  padding: 36px 0 60px;
}
.page h1 { font-size: 1.8rem; }
.page h2 { font-size: 1.25rem; margin-top: 1.6em; }
.page p, .page li { color: var(--text-muted); }
.page ul { padding-inline-start: 22px; }
.page li { margin-bottom: 6px; }

/* ===== Footer ===== */
.site-footer {
  background: #12261f;
  color: #cbd7d3;
  margin-top: 40px;
}
.site-footer .container {
  padding-block: 40px 24px;
  display: grid;
  gap: 28px;
  grid-template-columns: 1fr;
}
@media (min-width: 720px) {
  .site-footer .container { grid-template-columns: 1.4fr 1fr 1fr; }
}
.site-footer h4 {
  color: #fff;
  font-size: .95rem;
  margin-bottom: 12px;
}
.site-footer p { color: #a9bab4; font-size: .9rem; }
.site-footer ul li { margin-bottom: 8px; }
.site-footer a { color: #cbd7d3; font-size: .9rem; }
.site-footer a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  text-align: center;
  padding: 16px 0;
  font-size: .82rem;
  color: #8ba39c;
}

/* ===== Utilities ===== */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}