@import url("https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;700&family=IBM+Plex+Sans:wght@400;500;600&display=swap");



:root {
--bg: #0e1117;
--panel: #151a22;
--panel-2: #1b2230;
--text: #f5f7fa;
--muted: #9aa4b2;
--accent-1: #00e5ff;
--accent-2: #ffb300;
--accent-3: #39ff14;
--danger: #ff4d6d;
--border: #273244;
--shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

*{
box-sizing: border-box;
margin: 0;
padding: 0;
}
body {
font-family: "Segoe UI", Tahoma, sans-serif;
background:
radial-gradient(circle at 20% 10%, #1a2a3c 0%, transparent 35%),
radial-gradient(circle at 80% 80%, #2a1b10 0%, transparent 35%),
var(--bg);
color: var(--text);
min-height: 100vh;
}

.app {
display: grid;
grid-template-columns: 280px 1fr;
min-height: 100vh;
}

.sidebar {
background: linear-gradient(180deg, #111723 0%, #0d121a 100%);
border-right: 1px solid var(--border);
padding: 24px;
}

.sidebar h1 {
font-size: 1.35rem;
margin-bottom: 18px;
color: var(--accent-2);
}

.nav-btn {
width: 100%;
margin-bottom: 10px;
padding: 12px;
border: 1px solid var(--border);
background: var(--panel);
color: var(--text);
border-radius: 10px;
cursor: pointer;
text-align: left;
transition: 0.2s;
}

.nav-btn:hover,
.nav-btn.active {
border-color: var(--accent-1);
box-shadow: 0 0 0 1px var(--accent-1) inset;
transform: translateY(-1px);
}

.main {
padding: 24px;
}

.lab {
display: none;
background: var(--panel);
border: 1px solid var(--border);
border-radius: 14px;
padding: 18px;
box-shadow: var(--shadow);
}

.lab.active {
display: block;
animation: fadeIn 0.25s ease;
}

.lab h2 {
margin-bottom: 14px;
color: var(--accent-1);
}

canvas {
width: 100%;
max-width: 100%;
background: #0b0f15;
border: 1px solid var(--border);
border-radius: 10px;
margin-bottom: 14px;
}

.geogebra-frame {
width: 100%;
max-width: 100%;
height: auto;
aspect-ratio: 4 / 3;
margin-bottom: 14px;
}

.controls {
display: flex;
flex-wrap: wrap;
gap: 10px 16px;
align-items: center;
margin-bottom: 12px;
color: var(--muted);
}

.controls input[type="range"] {
width: 220px;
}

.output {
background: var(--panel-2);
border: 1px solid var(--border);
border-left: 4px solid var(--accent-3);
border-radius: 10px;
padding: 10px 12px;
margin-bottom: 12px;
color: var(--text);
}

.note {
border: 1px solid var(--border);
border-radius: 10px;
background: #111722;
padding: 12px;
}

.note h3 {
color: var(--accent-2);
margin-bottom: 6px;
}

.mode-btn {
padding: 8px 12px;
border-radius: 8px;
border: 1px solid var(--border);
background: #0f1622;
color: var(--text);
cursor: pointer;
}

.mode-btn.active {
border-color: var(--accent-1);
color: var(--accent-1);
}

@keyframes fadeIn {
from { opacity: 0; transform: translateY(6px); }
to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 900px) {
.app {
grid-template-columns: 1fr;
}

.sidebar {
border-right: none;
border-bottom: 1px solid var(--border);
}
}



body {
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  letter-spacing: 0.1px;
}

.sidebar h1 {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.4px;
}

.nav-btn {
  font-weight: 600;
  border-radius: 12px;
  background: linear-gradient(180deg, #171f2c 0%, #141b27 100%);
}

.nav-btn:hover,
.nav-btn.active {
  border-color: var(--accent-1);
  box-shadow: 0 0 0 1px rgba(0, 229, 255, 0.5) inset, 0 10px 22px rgba(0, 0, 0, 0.35);
}

.lab h2 {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  letter-spacing: 0.3px;
}