/* الهجده — الحاسبة العلمية */

.calc-body {
  --calc-bg: #f4efe4;
  --calc-card: #fffaf1;
  --calc-line: rgba(28, 25, 20, 0.10);
  --calc-line-strong: rgba(179, 147, 89, 0.38);
  --calc-gold: #b39359;
  --calc-gold-bright: #8f7344;
  --calc-text: #1c1914;
  --calc-muted: #6b6458;
  --calc-danger: #e0685f;
  --calc-screen: #07100f;
  --calc-mono: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  margin: 0;
  min-height: 100vh;
  color: var(--calc-text);
  font-family: "IBM Plex Sans Arabic", "Tajawal", sans-serif;
  background:
    radial-gradient(ellipse 80% 50% at 100% -10%, rgba(179, 147, 89, 0.1), transparent 55%),
    radial-gradient(ellipse 60% 40% at -5% 100%, rgba(56, 184, 181, 0.05), transparent 50%),
    var(--calc-bg);
  -webkit-font-smoothing: antialiased;
}

html[data-theme="dark"] .calc-body {
  --calc-bg: #1c1814;
  --calc-card: #2a241c;
  --calc-line: rgba(244, 239, 228, 0.10);
  --calc-line-strong: rgba(196, 164, 106, 0.42);
  --calc-gold-bright: #e0c58a;
  --calc-text: #f4efe4;
  --calc-muted: #b3a48d;
}

.calc-body *,
.calc-body *::before,
.calc-body *::after { box-sizing: border-box; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100px;
  right: 1rem;
  z-index: 10000;
  padding: 0.65rem 1rem;
  border-radius: 8px;
  background: var(--calc-gold);
  color: #1a140c;
  font-weight: 700;
  text-decoration: none;
}
.skip-link:focus { top: 1rem; }

.calc-body :focus-visible {
  outline: 2px solid var(--calc-gold-bright);
  outline-offset: 2px;
}

/* ————————————————————————— الترويسة ————————————————————————— */

.calc-page {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(1.25rem, 4vw, 2.75rem) clamp(0.9rem, 3vw, 2rem) 4rem;
}

.calc-hero { margin-bottom: clamp(1.25rem, 3vw, 2rem); }

.calc-kicker {
  margin: 0 0 0.4rem;
  color: var(--calc-gold);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
}

.calc-title {
  margin: 0 0 0.6rem;
  font-family: "Noto Naskh Arabic", "Amiri", serif;
  font-size: clamp(1.7rem, 4.5vw, 2.6rem);
  font-weight: 700;
  line-height: 1.2;
}

.calc-lead {
  max-width: 62ch;
  margin: 0;
  color: var(--calc-muted);
  font-size: clamp(0.9rem, 2.2vw, 1rem);
  line-height: 1.85;
}

.calc-selfcheck-badge {
  display: inline-block;
  margin: 0.9rem 0 0;
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--calc-line-strong);
  border-radius: 999px;
  background: rgba(179, 147, 89, 0.08);
  color: var(--calc-gold-bright);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
}
.calc-selfcheck-badge.is-bad {
  border-color: rgba(224, 104, 95, 0.45);
  background: rgba(224, 104, 95, 0.1);
  color: var(--calc-danger);
}

/* ————————————————————————— الشبكة ————————————————————————— */

.calc-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(0.9rem, 2.5vw, 1.5rem);
  align-items: start;
}

@media (max-width: 900px) {
  .calc-grid { grid-template-columns: minmax(0, 1fr); }
}

.calc-unit,
.calc-side {
  padding: clamp(0.85rem, 2.2vw, 1.25rem);
  border: 1px solid var(--calc-line);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.012)), var(--calc-card);
  box-shadow: 0 22px 45px -32px rgba(0, 0, 0, 0.9);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

/* ————————————————————————— الشاشة ————————————————————————— */

.calc-screen {
  padding: 0.7rem 0.85rem 0.85rem;
  border: 1px solid rgba(56, 184, 181, 0.18);
  border-radius: 12px;
  background:
    linear-gradient(180deg, rgba(56, 184, 181, 0.06), transparent 60%),
    var(--calc-screen);
  box-shadow: inset 0 2px 14px rgba(0, 0, 0, 0.6);
}

.calc-status {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  font-family: var(--calc-mono);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
}

.calc-flag {
  color: var(--calc-muted);
  opacity: 0.28;
  transition: opacity 0.15s ease, color 0.15s ease;
}
.calc-flag.is-on {
  color: var(--calc-gold-bright);
  opacity: 1;
}

.calc-entry {
  display: block;
  width: 100%;
  margin-top: 0.55rem;
  padding: 0.15rem 0;
  border: 0;
  background: transparent;
  color: var(--calc-text);
  font-family: var(--calc-mono);
  font-size: clamp(1rem, 3vw, 1.3rem);
  line-height: 1.5;
  caret-color: var(--calc-gold-bright);
}
.calc-entry:focus { outline: none; }
.calc-entry::placeholder { color: rgba(255, 255, 255, 0.18); }

.calc-result {
  display: block;
  overflow-x: auto;
  padding-top: 0.35rem;
  color: var(--calc-gold-bright);
  font-family: var(--calc-mono);
  font-size: clamp(1.6rem, 6vw, 2.4rem);
  font-weight: 600;
  line-height: 1.25;
  text-align: left;
  white-space: nowrap;
  scrollbar-width: thin;
}
.calc-result sup {
  font-size: 0.55em;
  vertical-align: super;
}
.calc-result.is-error {
  color: var(--calc-danger);
  font-size: clamp(1.15rem, 4vw, 1.6rem);
}

.calc-extra,
.calc-hint {
  margin: 0.35rem 0 0;
  font-size: 0.75rem;
  line-height: 1.7;
}
.calc-extra {
  color: var(--calc-muted);
  font-family: var(--calc-mono);
  text-align: left;
}
.calc-hint {
  direction: rtl;
  color: var(--calc-danger);
  text-align: right;
}
.calc-hint.is-note { color: var(--calc-muted); }
.calc-anglenote { color: var(--calc-gold); }

.calc-unit.is-shift .k__alt {
  color: var(--calc-gold-bright);
  opacity: 1;
}
.calc-unit.is-shift .k__main { opacity: 0.55; }

/* ————————————————————————— المفاتيح ————————————————————————— */

.calc-pad {
  display: grid;
  gap: 0.4rem;
  margin-top: 0.7rem;
}
.calc-pad--fn { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.calc-pad--num { grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 0.45rem; }
.calc-pad--mem { grid-template-columns: repeat(6, minmax(0, 1fr)); }

.k {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.1rem;
  min-height: 44px;
  padding: 0.35rem 0.2rem;
  border: 1px solid var(--calc-line);
  border-radius: 10px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02));
  color: var(--calc-text);
  font-family: var(--calc-mono);
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.1;
  cursor: pointer;
  -webkit-user-select: none;
  user-select: none;
  touch-action: manipulation;
  transition: transform 0.08s ease, background 0.15s ease, border-color 0.15s ease;
}
.k:hover { border-color: var(--calc-line-strong); background: rgba(179, 147, 89, 0.12); }
.k:active { transform: translateY(1px) scale(0.98); }

.k__alt {
  color: var(--calc-gold);
  font-size: 0.55rem;
  font-weight: 600;
  line-height: 1;
  opacity: 0.85;
}
.k__main { line-height: 1.15; }
.k--small { font-size: 0.72rem; }

.k--ctl {
  background: rgba(255, 255, 255, 0.03);
  color: var(--calc-muted);
  font-size: 0.68rem;
}
.k--ctl.is-armed,
.k--mem.is-armed {
  border-color: var(--calc-gold);
  background: rgba(179, 147, 89, 0.22);
  color: var(--calc-gold-bright);
}

.k--fn { color: #cfe9e8; }
.k--num { font-size: 1.15rem; font-weight: 700; }
.k--op { color: var(--calc-gold-bright); font-size: 1.15rem; }
.k--del { color: var(--calc-danger); font-size: 0.8rem; }
.k--mem { font-size: 0.75rem; color: var(--calc-muted); }
.k--var { min-height: 38px; font-size: 0.85rem; }

.k--eq {
  border-color: transparent;
  background: linear-gradient(180deg, var(--calc-gold-bright), var(--calc-gold));
  color: #1a140c;
  font-size: 1.3rem;
  font-weight: 800;
}
.k--eq:hover { background: linear-gradient(180deg, #e2c98d, var(--calc-gold-bright)); }

.calc-vars {
  margin-top: 0.5rem;
  padding: 0.5rem;
  border: 1px dashed var(--calc-line-strong);
  border-radius: 10px;
}
.calc-vars__label {
  display: block;
  direction: rtl;
  margin-bottom: 0.4rem;
  color: var(--calc-gold-bright);
  font-size: 0.72rem;
  text-align: right;
}
.calc-vars__row {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 0.3rem;
}

.calc-keyboard-note {
  margin: 0.85rem 0 0;
  color: var(--calc-muted);
  font-size: 0.72rem;
  line-height: 1.9;
}
.calc-keyboard-note kbd {
  padding: 0.05rem 0.35rem;
  border: 1px solid var(--calc-line);
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.05);
  font-family: var(--calc-mono);
  font-size: 0.7rem;
}
.calc-keyboard-note code,
.calc-notes code {
  padding: 0.05rem 0.3rem;
  border-radius: 5px;
  background: rgba(179, 147, 89, 0.12);
  color: var(--calc-gold-bright);
  font-family: var(--calc-mono);
  font-size: 0.78em;
  direction: ltr;
  display: inline-block;
}

/* ————————————————————————— اللوحات الجانبية ————————————————————————— */

.calc-tabs {
  display: flex;
  gap: 0.3rem;
  overflow-x: auto;
  padding-bottom: 0.55rem;
  margin-bottom: 0.75rem;
  border-bottom: 1px solid var(--calc-line);
  scrollbar-width: none;
}
.calc-tabs::-webkit-scrollbar { display: none; }

.calc-tab {
  flex: 0 0 auto;
  padding: 0.4rem 0.8rem;
  border: 1px solid transparent;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--calc-muted);
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.calc-tab:hover { color: var(--calc-text); }
.calc-tab.is-active {
  border-color: var(--calc-line-strong);
  background: rgba(179, 147, 89, 0.16);
  color: var(--calc-gold-bright);
}

.calc-panel { min-height: 240px; }
.calc-panel[hidden] { display: none; }

.calc-panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
}
.calc-panel__head h2 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
}
.calc-panel__note,
.calc-panel__empty {
  margin: 0 0 0.7rem;
  color: var(--calc-muted);
  font-size: 0.76rem;
  line-height: 1.85;
}
.calc-panel__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.6rem 0;
}

.calc-mini-btn {
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--calc-line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--calc-muted);
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.calc-mini-btn:hover { border-color: var(--calc-line-strong); color: var(--calc-text); }
.calc-mini-btn.is-primary {
  border-color: var(--calc-line-strong);
  background: rgba(179, 147, 89, 0.18);
  color: var(--calc-gold-bright);
}

/* السجل */

.calc-history {
  margin: 0;
  padding: 0;
  max-height: 260px;
  overflow-y: auto;
  list-style: none;
}
.calc-history li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.45rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.calc-history button {
  border: 0;
  background: none;
  color: inherit;
  font-family: var(--calc-mono);
  cursor: pointer;
  direction: ltr;
  text-align: left;
  padding: 0.1rem 0.2rem;
  border-radius: 6px;
}
.calc-history button:hover { background: rgba(179, 147, 89, 0.14); }
.calc-history .hist-expr {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  color: var(--calc-muted);
  font-size: 0.76rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.calc-history .hist-value {
  flex: 0 0 auto;
  color: var(--calc-gold-bright);
  font-size: 0.88rem;
  font-weight: 600;
}

.calc-registers { margin-top: 1rem; }
.calc-registers h3 {
  margin: 0 0 0.5rem;
  font-size: 0.82rem;
  font-weight: 700;
}
.calc-reg-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(105px, 1fr));
  gap: 0.35rem;
  margin: 0;
}
.calc-reg-list div {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  padding: 0.3rem 0.45rem;
  border: 1px solid var(--calc-line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
  direction: ltr;
}
.calc-reg-list dt {
  color: var(--calc-gold);
  font-family: var(--calc-mono);
  font-size: 0.72rem;
  font-weight: 700;
}
.calc-reg-list dd {
  margin: 0;
  overflow: hidden;
  color: var(--calc-muted);
  font-family: var(--calc-mono);
  font-size: 0.72rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* الإحصاء */

.calc-field {
  display: block;
  margin-bottom: 0.5rem;
}
.calc-field > span {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--calc-muted);
  font-size: 0.74rem;
}
.calc-field textarea,
.calc-field input {
  width: 100%;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--calc-line);
  border-radius: 9px;
  background: rgba(0, 0, 0, 0.35);
  color: var(--calc-text);
  font-family: var(--calc-mono);
  font-size: 0.85rem;
  resize: vertical;
}
.calc-field--inline {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.55rem;
}
.calc-field--inline > span { margin: 0; }
.calc-field--inline input { width: 5.5rem; }

.calc-stats-out {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 0.4rem;
  margin: 0.5rem 0 0;
}
.calc-stats-out div {
  padding: 0.5rem 0.55rem;
  border: 1px solid var(--calc-line);
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.02);
}
.calc-stats-out dt {
  color: var(--calc-muted);
  font-size: 0.7rem;
}
.calc-stats-out dd {
  margin: 0.2rem 0 0;
  overflow-x: auto;
  color: var(--calc-gold-bright);
  direction: ltr;
  font-family: var(--calc-mono);
  font-size: 0.92rem;
  font-weight: 600;
  text-align: left;
}

/* الثوابت */

.calc-const-list {
  display: grid;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  max-height: 340px;
  overflow-y: auto;
  list-style: none;
}
.calc-const-list button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  width: 100%;
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--calc-line);
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.02);
  color: var(--calc-text);
  font-family: inherit;
  text-align: right;
  cursor: pointer;
}
.calc-const-list button:hover { border-color: var(--calc-line-strong); background: rgba(179, 147, 89, 0.1); }
.calc-const-list .const-name { font-size: 0.76rem; }
.calc-const-list .const-symbol {
  color: var(--calc-gold-bright);
  font-family: var(--calc-mono);
  font-size: 0.82rem;
  font-weight: 700;
}
.calc-const-list .const-value {
  display: block;
  color: var(--calc-muted);
  direction: ltr;
  font-family: var(--calc-mono);
  font-size: 0.68rem;
  text-align: left;
}

/* الإعدادات */

.calc-set {
  margin: 0 0 0.9rem;
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--calc-line);
  border-radius: 10px;
}
.calc-set legend {
  padding: 0 0.35rem;
  color: var(--calc-gold);
  font-size: 0.72rem;
  font-weight: 700;
}
.calc-set__row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}
.calc-chip {
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--calc-line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--calc-muted);
  font-family: inherit;
  font-size: 0.74rem;
  font-weight: 600;
  cursor: pointer;
}
.calc-chip:hover { color: var(--calc-text); }
.calc-chip.is-active {
  border-color: var(--calc-line-strong);
  background: rgba(179, 147, 89, 0.18);
  color: var(--calc-gold-bright);
}

/* الفحص الذاتي */

.calc-check-summary {
  margin: 0 0 0.6rem;
  color: var(--calc-gold-bright);
  font-family: var(--calc-mono);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}
.calc-check-summary.is-bad { color: var(--calc-danger); }

.calc-check-groups,
.calc-check-fails {
  margin: 0;
  padding: 0;
  list-style: none;
}
.calc-check-groups li {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.3rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.78rem;
}
.calc-check-groups .count {
  color: var(--calc-muted);
  direction: ltr;
  font-family: var(--calc-mono);
}
.calc-check-groups .is-bad { color: var(--calc-danger); }
.calc-check-fails li {
  margin-top: 0.4rem;
  color: var(--calc-danger);
  direction: ltr;
  font-family: var(--calc-mono);
  font-size: 0.72rem;
  text-align: left;
}

/* ————————————————————————— الشرح ————————————————————————— */

.calc-notes {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
  padding: clamp(1rem, 3vw, 1.6rem);
  border: 1px solid var(--calc-line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.015);
}
.calc-notes h2 {
  margin: 0 0 1rem;
  font-size: 1.1rem;
  font-weight: 700;
}
.calc-notes__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem 1.4rem;
}
.calc-notes h3 {
  margin: 0 0 0.35rem;
  color: var(--calc-gold-bright);
  font-size: 0.88rem;
  font-weight: 700;
}
.calc-notes p {
  margin: 0;
  color: var(--calc-muted);
  font-size: 0.82rem;
  line-height: 1.95;
}
.calc-disclaimer {
  margin: 1.2rem 0 0;
  padding-top: 0.9rem;
  border-top: 1px solid var(--calc-line);
  color: var(--calc-muted);
  font-size: 0.75rem;
  line-height: 1.9;
}

@media (max-width: 420px) {
  .calc-pad { gap: 0.3rem; }
  .k { min-height: 42px; font-size: 0.78rem; }
  .k--num { font-size: 1.05rem; }
  .k__alt { font-size: 0.5rem; }
  .calc-pad--mem { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .calc-vars__row { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}