:root {
  --bg-0: #edf6ff;
  --bg-1: #d8ebff;
  --bg-2: #cbe4ff;
  --card: rgba(255, 255, 255, 0.84);
  --card-border: rgba(46, 120, 176, 0.24);
  --text: #12344e;
  --muted: #4f6f86;
  --accent: #1d79c8;
  --accent-soft: #87c6ff;
  --accent-2: #2aa0d8;
  --danger: #c84343;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: radial-gradient(circle at 12% 18%, #f4fbff 0%, transparent 36%),
    radial-gradient(circle at 84% 10%, #dcefff 0%, transparent 35%),
    linear-gradient(160deg, var(--bg-0), var(--bg-1) 45%, var(--bg-2));
  font-family: "Sora", sans-serif;
  line-height: 1.5;
}

.background-blobs span {
  position: fixed;
  z-index: -1;
  border-radius: 999px;
  filter: blur(16px);
  opacity: 0.38;
  animation: float 18s ease-in-out infinite;
}

.background-blobs span:nth-child(1) {
  width: 260px;
  height: 260px;
  background: #9dd4ff;
  top: -70px;
  left: -90px;
}

.background-blobs span:nth-child(2) {
  width: 240px;
  height: 240px;
  background: #b3defe;
  bottom: 8%;
  right: -100px;
  animation-delay: 4s;
}

.background-blobs span:nth-child(3) {
  width: 170px;
  height: 170px;
  background: #a8e2ff;
  top: 43%;
  right: 14%;
  animation-delay: 1.5s;
}

.layout {
  width: min(1200px, calc(100% - 2rem));
  margin: 1rem auto 3rem;
  display: grid;
  gap: 1rem;
}

.card {
  border: 1px solid var(--card-border);
  background: var(--card);
  backdrop-filter: blur(7px);
  border-radius: 18px;
  padding: 1rem;
  box-shadow: 0 12px 30px rgba(50, 110, 160, 0.13);
}

.reveal {
  animation: reveal 0.62s ease both;
}

.stagger-1 {
  animation-delay: 0.08s;
}

.stagger-2 {
  animation-delay: 0.14s;
}

.stagger-3 {
  animation-delay: 0.2s;
}

.stagger-4 {
  animation-delay: 0.26s;
}

.stagger-5 {
  animation-delay: 0.32s;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
}

h1,
h2,
h3 {
  margin: 0.1rem 0 0.7rem;
}

h1 {
  font-size: clamp(1.55rem, 2.8vw, 2.3rem);
}

h2 {
  font-size: clamp(1.18rem, 2.1vw, 1.55rem);
}

h3 {
  font-size: 1rem;
}

p {
  margin: 0.3rem 0;
}

.muted {
  color: var(--muted);
}

.equation-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  align-items: start;
}

.equation-grid > article {
  min-width: 0;
}

.equation-grid mjx-container[display="true"] {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
}

.grid {
  display: grid;
  gap: 0.75rem;
}

.two-cols {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

label {
  display: grid;
  gap: 0.34rem;
}

label span {
  font-size: 0.85rem;
  color: var(--muted);
}

.consent-row {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  margin: 0.65rem 0 0.3rem;
  padding: 0.62rem 0.7rem;
  border: 1px solid rgba(43, 116, 171, 0.25);
  border-radius: 10px;
  background: rgba(232, 245, 255, 0.82);
}

.consent-row input[type="checkbox"] {
  width: 1rem;
  height: 1rem;
  margin-top: 0.16rem;
}

.consent-row span {
  color: #204360;
  font-size: 0.9rem;
}

.consent-wrap {
  margin-top: -0.2rem;
}

input,
textarea {
  width: 100%;
  border-radius: 11px;
  border: 1px solid rgba(59, 126, 179, 0.24);
  background: rgba(251, 254, 255, 0.98);
  color: var(--text);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.9rem;
  padding: 0.65rem 0.7rem;
}

input:focus,
textarea:focus {
  outline: 2px solid rgba(60, 144, 206, 0.34);
  border-color: rgba(60, 144, 206, 0.45);
}

textarea {
  min-height: 88px;
  resize: vertical;
}

.btn {
  border: 0;
  border-radius: 12px;
  padding: 0.72rem 1rem;
  color: #f7fcff;
  font-weight: 700;
  font-family: "Sora", sans-serif;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(120deg, var(--accent), #2ba0e4);
  box-shadow: 0 7px 20px rgba(30, 126, 193, 0.25);
}

.btn-secondary {
  background: linear-gradient(120deg, #1f8ad0, #69b7f6);
  box-shadow: 0 7px 20px rgba(32, 141, 212, 0.22);
}

#runBtn {
  margin-top: 0.8rem;
}

#discretizeBtn {
  margin-top: 0.7rem;
}

.mode-toggle {
  display: inline-flex;
  border: 1px solid rgba(59, 126, 179, 0.28);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 0.8rem;
  background: rgba(227, 242, 254, 0.85);
}

.mode-btn {
  border: 0;
  background: transparent;
  color: #245170;
  padding: 0.6rem 0.9rem;
  cursor: pointer;
  font-family: "Sora", sans-serif;
  font-weight: 600;
}

.mode-btn.active {
  background: rgba(66, 151, 214, 0.22);
  color: #15456a;
}

.panel-hidden {
  display: none;
}

.panel-visible {
  display: grid;
}

.status {
  min-height: 1.3rem;
  margin-top: 0.55rem;
}

.status.error {
  color: var(--danger);
}

.status.ok {
  color: #1f679e;
}

.output {
  margin: 0.8rem 0 0;
  padding: 0.75rem;
  border-radius: 10px;
  border: 1px solid rgba(59, 126, 179, 0.24);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.82rem;
  max-height: 230px;
  overflow: auto;
  background: rgba(244, 251, 255, 0.95);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 0.7rem;
  margin-bottom: 0.8rem;
}

.metric {
  border: 1px solid rgba(59, 126, 179, 0.22);
  border-radius: 12px;
  padding: 0.6rem;
  background: rgba(242, 249, 255, 0.95);
}

.metric .label {
  font-size: 0.75rem;
  color: var(--muted);
}

.metric .value {
  font-size: 1rem;
  font-weight: 400;
  color: #174262;
}

.plot {
  min-height: 330px;
  margin-bottom: 0.8rem;
  border: 1px solid rgba(59, 126, 179, 0.2);
  border-radius: 12px;
  overflow: hidden;
  background: rgba(247, 252, 255, 0.92);
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.82rem;
}

th,
td {
  border-bottom: 1px solid rgba(59, 126, 179, 0.2);
  text-align: left;
  padding: 0.45rem;
  white-space: nowrap;
}

@keyframes reveal {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-18px);
  }
}

@media (max-width: 780px) {
  .layout {
    width: calc(100% - 1rem);
  }

  .card {
    padding: 0.86rem;
  }

  .plot {
    min-height: 280px;
  }
}

@media (max-width: 920px) {
  .equation-grid {
    grid-template-columns: 1fr;
  }
}

.site-footer {
  text-align: center;
  padding: 0 1rem 1.5rem;
  color: #315974;
}

.site-footer p {
  margin: 0;
}

.footer-link {
  color: #1b73bf;
  text-decoration: none;
}

.footer-link:hover {
  text-decoration: none;
}