:root {
  --primary: #112548;
  --primary-hover: #1e3a6e;
  --bg-input: #f8fafc;
  --border-light: #e2e8f0;
  --shadow-soft: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --accent: #bae6fd;
}

@font-face {
  font-family: 'Baloo Bhaijaan 2';
  src: url('https://quamtex.ir/fonts/webfonts/baloo-bhaijaan-2-arabic-500-normal.woff') format('woff');
  font-weight: normal;
  font-style: normal;
}

@font-face {
  font-family: 'Baloo Bhaijaan 2';
  src: url('https://quamtex.ir/fonts/webfonts/baloo-bhaijaan-2-latin-500-normal.woff') format('woff');
  font-weight: normal;
  font-style: normal;
}

.rtl { direction: rtl;}

body {
  background-color: #dae0e2;
  font-family: 'Baloo Bhaijaan 2', sans-serif;
  margin: 0;
}

.main-container {
  display: flex;
  flex-direction: row;
}

.main-content {
  padding: clamp(1rem, 2vw, 2rem);
  margin: clamp(0.5rem, 1.5vw, 1.5rem);
  background-color: #ffffff;
  border-radius: 24px;
  font-size: clamp(0.938rem, 0.842rem + 0.426vw, 1.188rem);
  text-align: center;
  /* مدرن‌سازی سایه کانتینر اصلی */
  border: 1px solid rgba(255, 255, 255, 0.5);
  color: var(--primary);
  width: 100%;
}

h1 {
    font-size: 24px;
}
/* ماشین حساب */
.calculator-wrapper {
  display: grid;
  grid-template-columns: 1fr 2.5fr;
  gap: 15px;
  margin: 15px 0;
}

.calculator-card {
  background: #ffffff;
  border: 2px solid var(--border-light);
  border-radius: 24px;
  padding: 25px;
  transition: all 0.3s ease;
}

.display-container {
  background: var(--bg-input);
  border: 2px solid var(--border-light);
  border-radius: 16px;
  padding: 15px;
  margin-bottom: 20px;
  text-align: left;
  direction: ltr;
}

.display {
  font-size: 2.5rem;
  color: var(--primary);
  min-height: 60px;
  overflow-x: auto;
}

.previous-operand {
  font-size: 1.1rem;
  color: #64748b;
  min-height: 24px;
}

/* دکمه‌ها */
.calculator-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.calculator-buttons button {
  font-family: inherit;
  font-size: 1.2rem;
  padding: 15px 0;
  border: 1px solid var(--border-light);
  border-radius: 16px;
  background: white;
  cursor: pointer;
  transition: all 0.2s;
}

.calculator-buttons button:hover {
  background: var(--bg-input);
  transform: translateY(-2px);
  border-color: var(--primary);
}

.op.special {
  background: #f0f9ff;
  color: var(--primary);
  font-weight: bold;
}

.pop {
  grid-column: span 1; /* در ماشین حساب تکی است */
  background: linear-gradient(135deg, var(--primary) 0%, #2c4a85 100%) !important;
  color: white !important;
  border: none !important;
}

#equal {
    grid-column: span 1;
}

/* تاریخچه */
.history-panel {
  background: var(--bg-input);
  border-radius: 24px;
  padding: 20px;
  border: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
}

#history-list {
  list-style: none;
  padding: 0;
  max-height: 300px;
  overflow-y: auto;
  flex-grow: 1;
}

#history-list li {
  padding: 10px;
  border-bottom: 1px solid #e2e8f0;
  font-size: 0.9rem;
  text-align: right;
}

.clear-hist-btn {
    background: transparent;
    border: none;
    color: #ef4444;
    cursor: pointer;
    margin-top: 10px;
    font-family: inherit;
}

/* ریسپانسیو */
@media (max-width: 920px) {
  .calculator-wrapper {
    grid-template-columns: 1fr;
  }
}



.description-title {
  font-size: clamp(1rem, 0.809rem + 0.851vw, 1.5rem);
  color: var(--primary);
  margin-bottom: 10px;
  border-bottom: 2px solid #f1f5f9;
  padding-bottom: 10px;
  display: inline-block;
}

.description {
  background-color: #ffffff;
  padding: 25px;
  border-radius: 20px;
  margin-bottom: 16px;
  /* سایه نرم‌تر */
  text-align: right;
  font-size: clamp(0.875rem, 0.731rem + 0.638vw, 1.25rem);
  border: 2px solid var(--border-light);
  margin-top: 20px;
}