@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@500;600&display=swap');

:root{
  --ink:#1B2430;
  --ink-soft:#3A4658;
  --paper:#F4F6F3;
  --paper-line:#DDE3DC;
  --amber:#D9A62E;
  --amber-deep:#B8871C;
  --good:#3F7A5C;
  --bad:#B84C3E;
}
*{box-sizing:border-box;}
body{
  margin:0;
  background:var(--paper);
  font-family:'Inter',sans-serif;
  color:var(--ink);
  display:flex;
  justify-content:center;
  padding:32px 16px;
}
.card{
  width:100%;
  max-width:640px;
  background:#fff;
  border:1px solid var(--paper-line);
  border-radius:4px;
  overflow:hidden;
  box-shadow:0 1px 2px rgba(27,36,48,0.06);
}
.head{
  background:var(--ink);
  color:var(--paper);
  padding:20px 24px;
  display:flex;
  align-items:baseline;
  gap:10px;
}
.head .brand{
  font-family:'Space Grotesk',sans-serif;
  font-weight:700;
  font-size:20px;
  letter-spacing:-0.01em;
}
.head .brand span{color:var(--amber);}
.head .subject{
  font-size:12px;
  color:#9FB0C4;
  text-transform:uppercase;
  letter-spacing:0.08em;
  margin-left:auto;
}
.body{padding:24px;}
.eyebrow{
  font-size:11px;
  text-transform:uppercase;
  letter-spacing:0.1em;
  color:var(--ink-soft);
  margin-bottom:8px;
  font-weight:600;
}
.form-label{
  font-family:'Space Grotesk',sans-serif;
  font-size:22px;
  font-weight:600;
  margin-bottom:16px;
}
.coeff-row{
  display:flex;
  align-items:center;
  gap:8px;
  flex-wrap:wrap;
  font-family:'JetBrains Mono',monospace;
  font-size:19px;
  margin-bottom:20px;
}
.coeff-row input{
  width:80px;
  padding:8px 6px;
  font-family:'JetBrains Mono',monospace;
  font-size:17px;
  text-align:center;
  border:1.5px solid var(--paper-line);
  border-radius:3px;
  background:var(--paper);
  color:var(--ink);
}
.coeff-row input:focus{
  outline:none;
  border-color:var(--amber);
  background:#fff;
}
button.solve{
  font-family:'Space Grotesk',sans-serif;
  font-weight:600;
  font-size:15px;
  background:var(--amber);
  color:var(--ink);
  border:none;
  padding:11px 22px;
  border-radius:3px;
  cursor:pointer;
  transition:background 0.15s ease;
}
button.solve:hover{background:var(--amber-deep);}
button.solve:focus-visible{outline:2px solid var(--ink); outline-offset:2px;}

.result-block{
  margin-top:24px;
  border-top:1px dashed var(--paper-line);
  padding-top:20px;
  display:none;
}
.result-block.show{display:block;}
.answer{
  font-family:'JetBrains Mono',monospace;
  font-size:20px;
  font-weight:600;
  padding:14px 16px;
  border-radius:3px;
  margin-bottom:18px;
}
.answer.real{background:#EAF3EE; color:var(--good); border:1px solid #CFE4D8;}
.answer.complex{background:#FBF1EA; color:var(--bad); border:1px solid #F0D9CE;}

.steps{
  display:flex;
  flex-direction:column;
  gap:14px;
}
.step{
  display:flex;
  gap:14px;
}
.step .num{
  flex:0 0 auto;
  width:24px;
  height:24px;
  border-radius:50%;
  border:1.5px solid var(--ink);
  color:var(--ink);
  font-family:'JetBrains Mono',monospace;
  font-size:12px;
  font-weight:600;
  display:flex;
  align-items:center;
  justify-content:center;
  margin-top:1px;
}
.step .content .label{
  font-size:13px;
  color:var(--ink-soft);
  margin-bottom:3px;
}
.step .content .expr{
  font-family:'JetBrains Mono',monospace;
  font-size:16px;
}
.err{
  color:var(--bad);
  font-size:13px;
  margin-top:6px;
  display:none;
}
.err.show{display:block;}

/* Graphing Calculators Styles */
.mathyca-graphing .card,
.mathyca-graphing-3d .card {
  max-width: 1000px !important;
  width: 100%;
}

.calculator-layout {
  display: flex;
  gap: 24px;
  align-items: stretch;
}

@media (max-width: 767px) {
  .calculator-layout {
    flex-direction: column;
    align-items: stretch;
  }
}

.sidebar {
  flex: 0 0 320px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

@media (max-width: 767px) {
  .sidebar {
    flex: 1;
  }
}

.function-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.function-row {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--paper-line);
  border-radius: 4px;
  background: var(--paper);
  padding: 12px;
  position: relative;
  transition: all 0.2s ease;
}

.function-row:focus-within {
  border-color: var(--amber);
  background: #ffffff;
  box-shadow: 0 2px 8px rgba(27,36,48,0.04);
}

.function-row-main {
  display: flex;
  align-items: center;
  gap: 10px;
}

.color-indicator {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  flex-shrink: 0;
  border: 1px solid rgba(27, 36, 48, 0.15);
}

.func-input-wrapper {
  flex-grow: 1;
  display: flex;
  align-items: center;
  position: relative;
}

.func-prefix {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  color: var(--ink-soft);
  margin-right: 4px;
  user-select: none;
  font-weight: 600;
}

.func-input {
  width: 100%;
  border: none;
  background: transparent;
  font-family: 'JetBrains Mono', monospace;
  font-size: 15px;
  color: var(--ink);
  padding: 4px 0;
  outline: none;
}

.delete-btn {
  background: transparent;
  border: none;
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 20px;
  padding: 4px 8px;
  border-radius: 3px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s, background 0.15s;
}

.delete-btn:hover {
  color: var(--bad);
  background: rgba(184, 76, 62, 0.08);
}

.error-message {
  font-size: 12px;
  color: var(--bad);
  margin-top: 6px;
  padding-left: 24px;
  font-family: 'Inter', sans-serif;
  display: none;
  line-height: 1.4;
}

.error-message.show {
  display: block;
}

button.add-btn {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 14px;
  background: transparent;
  color: var(--ink);
  border: 1.5px dashed var(--paper-line);
  padding: 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
}

button.add-btn:hover {
  border-color: var(--amber);
  color: var(--amber-deep);
  background: rgba(217, 166, 46, 0.05);
}

.control-panel {
  border-top: 1px dashed var(--paper-line);
  padding-top: 16px;
}

.control-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  margin-bottom: 8px;
  font-weight: 600;
}

.btn-group {
  display: flex;
  gap: 8px;
}

.control-btn {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 14px;
  border: 1.5px solid var(--paper-line);
  background: #ffffff;
  color: var(--ink);
  padding: 8px 12px;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.control-btn:hover {
  background: var(--paper);
  border-color: var(--ink-soft);
}

.control-btn:focus-visible {
  outline: 2px solid var(--amber);
}

.info-panel {
  background: var(--paper);
  border: 1px solid var(--paper-line);
  border-radius: 4px;
  padding: 14px;
}

.info-title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  margin-bottom: 6px;
  font-weight: 700;
}

.info-text {
  font-size: 12px;
  color: var(--ink-soft);
  margin: 4px 0 8px 0;
  line-height: 1.4;
}

.info-text:last-child {
  margin-bottom: 0;
}

.info-text code {
  font-family: 'JetBrains Mono', monospace;
  background: #ffffff;
  padding: 1px 4px;
  border-radius: 2px;
  border: 1px solid rgba(0,0,0,0.05);
  color: var(--ink);
}

.graph-container {
  flex-grow: 1;
  position: relative;
  border: 1.5px solid var(--paper-line);
  border-radius: 4px;
  overflow: hidden;
  background: #ffffff;
}

@media (max-width: 767px) {
  .graph-container {
    height: 380px;
  }
}

.graph-canvas {
  width: 100%;
  height: 480px;
  display: block;
  cursor: crosshair;
}

.viewport3d {
  width: 100%;
  height: 480px;
  display: block;
}

@media (max-width: 767px) {
  .graph-canvas,
  .viewport3d {
    height: 100%;
  }
}

.hud {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(27, 36, 48, 0.85);
  color: #ffffff;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  padding: 6px 10px;
  border-radius: 3px;
  pointer-events: none;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  z-index: 10;
}