@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;700&family=IBM+Plex+Mono:wght@500;600;700&display=swap');
@import url('fontiran.css');

:root {
  --color-sheet: #f4f0e3;
  --color-sheet-sunken: #ece6d3;
  --color-sheet-alt: #eee8d8;

  --color-table: #0d1f33;
  --color-table-line: rgba(234, 244, 255, 0.05);
  --color-table-line-strong: rgba(234, 244, 255, 0.09);

  --color-ink: #1b2a41;
  --color-ink-soft: #3c4d63;
  --color-body: #55637a;
  --color-muted: #8b8a78;

  --color-rule: #d9d2ba;
  --color-rule-soft: #e7e1cd;
  --color-rule-input: #c7bfa2;

  --color-brass: #b9873c;
  --color-brass-bright: #d9a75a;
  --color-brass-hover: #9c6f2e;
  --color-focus: #2f6f8f;   
  --color-rust: #b1502f;    
  --color-teal: #3c7a72;    

  --space-1: 6px;
  --space-2: 10px;
  --space-3: 15px;
  --space-4: 20px;
  --space-5: 25px;

  --radius: 0;

  --font-fa: farhang2, 'Vazirmatn', Tahoma, sans-serif;
  --font-label: 'Space Grotesk', 'Vazirmatn', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
}

body {
  font-family: var(--font-fa) !important;
  background-color: var(--color-table);

  background-image:
    repeating-linear-gradient(0deg, var(--color-table-line-strong) 0 1px, transparent 1px 40px),
    repeating-linear-gradient(90deg, var(--color-table-line-strong) 0 1px, transparent 1px 40px),
    repeating-linear-gradient(0deg, var(--color-table-line) 0 1px, transparent 1px 8px),
    repeating-linear-gradient(90deg, var(--color-table-line) 0 1px, transparent 1px 8px);
  color: var(--color-ink);
  margin: 0;
  padding: 15px;
  direction: rtl;
}

h1, h2, h3, h4, h5, h6, input, textarea, select, button {
  font-family: var(--font-fa) !important;
}

h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
  color: var(--color-ink);
}

.wrapper {
  max-width: 900px;
  margin: 0 auto;
}

.ltr {
  direction: ltr;
}

.text-right { text-align: right; }
.text-center { text-align: center; }
.text-left { text-align: left; }

.text-small { font-size: 0.8em; }
.text-xsmall { font-size: 0.6em; }
.text-large { font-size: 1.2em; }
.text-xlarge { font-size: 1.4em; }

.text-underline { text-decoration: underline; }

.text-thin { font-weight: 100; }
.text-extralight { font-weight: 200; }
.text-light { font-weight: 300; }
.text-regular { font-weight: normal; }
.text-medium { font-weight: 500; }
.text-demibold { font-weight: 600; }
.text-bold { font-weight: bold; }
.text-extrabold { font-weight: 800; }
.text-black { font-weight: 900; }

blockquote {
  font-weight: 700;
  padding: 10px;
  border: 1px dashed var(--color-rule-input);
  background: var(--color-sheet-sunken);
  color: var(--color-ink);
}



.mainbox {
  width: 100%;
  background-color: var(--color-sheet-sunken);
  display: table;
  margin-bottom: 30px;
  border-right: 8px solid var(--color-brass);
}

.mainboxnegativ {
  width: 100%;
  background-color: var(--color-ink);
  display: table;
  margin-bottom: 30px;
  border-right: 8px solid var(--color-rust);
  color: var(--color-sheet);
}

.mainbox2 {
  font-size: 1em;
  width: 90%;
  padding-right: 20px;
  padding-top: 10px;
  padding-bottom: 10px;
}

.mainboxitalic {
  font-size: 1em;
  font-style: italic;
  width: 90%;
  padding-right: 20px;
  padding-top: 10px;
  padding-bottom: 10px;
}

.mainbox3 {
  width: 100%;
  background-color: var(--color-sheet-alt);
  display: table;
  margin-bottom: 30px;
  border-right: 8px solid var(--color-teal);
}

.mainbox2negativ {
  font-size: 1em;
  color: var(--color-sheet);
  background-color: var(--color-ink);
  padding-right: 20px;
}

.farsiparagraph {
  font-size: 1em;
  width: 47%;
  float: right;
  padding-right: 20px;
  padding-top: 10px;
  padding-bottom: 10px;
}

.farsiparagraph_negativ {
  font-size: 1em;
  color: var(--color-sheet);
  background-color: var(--color-ink);
  width: 47%;
  float: right;
  padding-right: 20px;
  padding-top: 10px;
  padding-bottom: 10px;
}

.englishparagraph {
  font-size: 1em;
  width: 47%;
  float: left;
  direction: ltr;
  padding-left: 20px;
  padding-top: 10px;
  padding-bottom: 10px;
}

.englishparagraph_negativ {
  font-size: 1em;
  color: var(--color-sheet);
  background-color: var(--color-ink);
  width: 47%;
  float: left;
  direction: ltr;
  padding-left: 20px;
  padding-top: 10px;
  padding-bottom: 10px;
}

.rightbox {
  width: 60%;
  padding-right: 20px;
  padding-left: 5px;
  float: right;
  margin-left: 10px;
  margin-bottom: 0px;
  min-width: 0px;
  background-color: var(--color-sheet-sunken);
}

.titelbox {
  width: 60%;
  padding-right: 25px;
  padding-left: 0px;
  float: right;
  margin-left: 10px;
  margin-bottom: 0px;
  min-width: 0px;
  background-color: var(--color-rule-soft);
  color: var(--color-ink-soft);
}

.lefttbox {
  padding-right: 20px;
  padding-left: 4px;
  float: right;
  margin-bottom: 10px;
  min-width: 0px;
}

.alphabet {
  width: 35%;
  float: left;
  font-size: 21em;
  text-align: center;
  font-weight: 600;
  color: var(--color-rule-input);
}

.alphabet2 {
  width: 35%;
  float: left;
  direction: ltr;
  font-size: 1.6em;
  text-align: left;
  font-weight: 600;
  color: var(--color-ink-soft);
  margin-top: 100px;
}

.footer_layout {
  font-weight: 400;
  font-size: 0.7em;
  text-align: center;
  direction: ltr;
  margin-bottom: 0px;
  padding-bottom: 0px;
}



.container {
  position: relative;
  max-width: 1050px;
  margin: 10px auto;
  background: var(--color-sheet);
  border-radius: var(--radius);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.35);
  padding: var(--space-5);
}


.container::before,
.container::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 2px solid var(--color-brass);
}

.container::before {
  top: 10px;
  right: 10px;
  border-left: none;
  border-bottom: none;
}

.container::after {
  bottom: 10px;
  left: 10px;
  border-right: none;
  border-top: none;
}

header {
  text-align: right;
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-rule);
}

header::before {
  content: "محاسبه‌گر ریاضی";
  display: block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-brass-hover);
  margin-bottom: var(--space-1);
}

.description {
  font-size: 13.5px;
  color: var(--color-body);
  margin-top: 5px;
}

.input-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  background: var(--color-sheet);
  border-radius: var(--radius);
  border-top: 1px solid var(--color-rule);
  border-bottom: 1px solid var(--color-rule);
  margin-bottom: var(--space-4);
  counter-reset: panel;
}

@media (max-width: 768px) {
  .input-grid {
    grid-template-columns: 1fr;
  }
  .eq-panel + .eq-panel {
    border-top: 1px solid var(--color-rule);
    border-right: none;
  }
}

.eq-panel {
  background: var(--color-sheet);
  border: none;
  padding: var(--space-4) var(--space-3);
  counter-increment: panel;
}

.eq-panel + .eq-panel {
  border-right: 1px solid var(--color-rule);
}

.eq-title {
  font-weight: bold;
  font-size: 14px;
  margin-bottom: var(--space-2);
  color: var(--color-ink-soft);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.eq-title::before {
  content: "DETAIL " counter(panel, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--color-sheet);
  background: var(--color-brass);
  padding: 2px 7px;
  margin-left: var(--space-1);
}

select {
  font-family: inherit;
  padding: 5px 10px;
  border: 1px solid var(--color-rule-input);
  border-radius: var(--radius);
  font-size: 12.5px;
  outline: none;
  cursor: pointer;
  background: var(--color-sheet);
  color: var(--color-ink);
}

.inputs-container {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: var(--space-2);
  min-height: 40px;
}

input[type="number"] {
  width: 65px;
  padding: 6px 8px;
  border: 1px solid var(--color-rule-input);
  border-radius: var(--radius);
  background: var(--color-sheet-sunken);
  text-align: center;
  font-family: var(--font-mono) !important;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
  direction: ltr;
}

input:focus, select:focus {
  border-color: var(--color-focus);
  outline: 2px solid var(--color-focus);
  outline-offset: 1px;
}

.math-char {
  font-family: 'Cambria', serif;
  font-style: italic;
  font-size: 16px;
  color: var(--color-ink-soft);
}

.btn-container {
  text-align: center;
  margin-bottom: var(--space-5);
}

.btn-solve {
  background-color: var(--color-brass);
  color: var(--color-sheet);
  border: none;
  padding: 10px 30px;
  font-size: 15px;
  font-weight: 700;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: inherit;
  transition: background-color 0.15s ease;
}

.btn-solve:hover {
  background-color: var(--color-brass-hover);
}

.btn-solve:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.main-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-5);
}

@media (max-width: 900px) {
  .main-grid {
    grid-template-columns: 1fr;
  }
  .results-box {
    margin-top: var(--space-4);
  }
}

.results-box {
  display: flex;
  flex-direction: column;
}

.canvas-box {
  position: relative;
  background: var(--color-sheet-sunken);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.canvas-box::before,
.canvas-box::after {
  content: "";
  position: absolute;
  width: 10px;
  height: 10px;
  border: 2px solid var(--color-brass);
}

.canvas-box::before {
  top: -1px;
  right: -1px;
  border-left: none;
  border-bottom: none;
}

.canvas-box::after {
  bottom: -1px;
  left: -1px;
  border-right: none;
  border-top: none;
}

canvas {
  border: 1px solid var(--color-rule);
  border-radius: var(--radius);
  background: var(--color-sheet);
  max-width: 100%;
  height: auto;
}

.legend {
  display: flex;
  gap: var(--space-3);
  margin-top: 12px;
  font-size: 12.5px;
  font-family: var(--font-mono);
  color: var(--color-body);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}


.color-dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius);
}

.banner-answer {
  background: var(--color-sheet-sunken);
  border-top: 1px solid var(--color-focus);
  border-bottom: 1px solid var(--color-focus);
  padding: 12px var(--space-1);
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: bold;
  color: var(--color-ink);
  margin-bottom: var(--space-3);
}

.tabs {
  display: flex;
  border-bottom: 1px solid var(--color-rule);
  margin-bottom: var(--space-3);
  gap: 0;
  counter-reset: tab;
}

.tab-btn {
  flex: 1;
  padding: 10px;
  background: none;
  border: none;
  font-family: inherit;
  font-weight: 700;
  font-size: 13.5px;
  color: var(--color-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 0.15s ease, border-color 0.15s ease;
  counter-increment: tab;
}

.tab-btn::before {
  content: counter(tab, decimal-leading-zero) " — ";
  font-family: var(--font-mono);
  color: var(--color-muted);
  font-weight: 700;
}

.tab-btn.active {
  color: var(--color-ink);
  border-bottom: 2px solid var(--color-focus);
}

.tab-btn.active::before {
  color: var(--color-focus);
}

.steps-view {
  display: none;
  background: var(--color-sheet-alt);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius);
  padding: var(--space-4);
  min-height: 250px;
  max-height: 420px;
  overflow-y: auto;
  line-height: 1.8;
  font-size: 14px;
  counter-reset: step;
}

.steps-view.active {
  display: block;
}

.step-item {
  background: var(--color-sheet);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius);
  padding: var(--space-3);
  margin-bottom: var(--space-3);
  counter-increment: step;
}

.step-text {
  font-weight: bold;
  color: var(--color-ink-soft);
  margin-bottom: var(--space-1);
  text-align: right;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.step-text::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-sheet);
  background: var(--color-brass);
  padding: 2px 7px;
}

.math-box {
  background: var(--color-sheet-sunken);
  padding: var(--space-2);
  border-radius: var(--radius);
  margin-top: 5px;
  font-family: var(--font-mono);
}

.identity-formula {
  font-size: 1.25em;
  color: var(--color-ink);
  background: var(--color-sheet-sunken);
  padding: var(--space-4);
  border-radius: var(--radius);
  margin-bottom: var(--space-4);
  border-top: 1px solid var(--color-focus);
  border-bottom: 1px solid var(--color-focus);
  font-family: var(--font-mono);
}



footer {
  display: flex;
  justify-content: center;
  gap: 0;
  margin-top: 35px;
  border-top: 2px solid var(--color-ink);
  font-size: 11.5px;
  font-family: var(--font-mono);
  color: var(--color-body);
  letter-spacing: 0.02em;
}

footer > * {
  padding: 8px 16px;
  border-left: 1px solid var(--color-rule);
}

footer > *:last-child {
  border-left: none;
}

@media (prefers-reduced-motion: reduce) {
  .btn-solve,
  .tab-btn {
    transition: none;
  }
}



#loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: var(--color-table);
  background-image:
    repeating-linear-gradient(0deg, var(--color-table-line) 0 1px, transparent 1px 40px),
    repeating-linear-gradient(90deg, var(--color-table-line) 0 1px, transparent 1px 40px);
  z-index: 99999;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  direction: rtl;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

#loading-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-card {
  position: relative;
  background-color: var(--color-sheet);
  border: 1px solid var(--color-rule);
  padding: 30px 40px;
  border-radius: var(--radius);
  text-align: center;
  max-width: 420px;
  width: 85%;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.4);
}

.loader-card::before,
.loader-card::after {
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  border: 2px solid var(--color-brass);
}

.loader-card::before {
  top: 8px;
  right: 8px;
  border-left: none;
  border-bottom: none;
}

.loader-card::after {
  bottom: 8px;
  left: 8px;
  border-right: none;
  border-top: none;
}

.loader-title {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 20px;
  line-height: 1.8;
}

.progress-container {
  width: 100%;
  height: 8px;
  background-color: var(--color-rule-soft);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  margin-bottom: 12px;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background-color: var(--color-brass);
  transition: width 0.25s ease-in-out;
}

.progress-text {
  font-size: 13px;
  color: var(--color-body);
  font-weight: bold;
  font-family: var(--font-mono);
  direction: ltr;
}