* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  color-scheme: light;
  --bg: #140b17;
  --text: #e2e8f0;
  --muted: #b6bfd1;
  --accent: #2dd4bf;
  --accent-2: #fb7185;
  --border: rgba(148, 163, 184, 0.24);
  --card: rgba(20, 13, 30, 0.72);
}

body {
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  background:
    radial-gradient(circle at 12% 10%, rgba(45, 212, 191, 0.25), transparent 42%),
    radial-gradient(circle at 88% 12%, rgba(251, 113, 133, 0.2), transparent 42%),
    linear-gradient(160deg, #1a0f1f 0%, #120a17 50%, #0f0915 100%);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

.page {
  width: min(1220px, 100%);
  max-width: 1220px;
  margin: 0 auto;
  padding: 40px 24px 60px;
}

.hero {
  background: linear-gradient(
    140deg,
    rgba(45, 212, 191, 0.2),
    rgba(251, 113, 133, 0.14)
  );
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 26px;
  margin-bottom: 24px;
  display: grid;
  gap: 16px;
  backdrop-filter: blur(8px);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.3em;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 12px;
}

h1 {
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1.2;
}

.subtitle {
  max-width: 760px;
  color: var(--muted);
  line-height: 1.55;
}

.system-mini {
  color: #b8c6da;
  font-size: 12px;
  opacity: 0.92;
}

.stat {
  display: grid;
  gap: 6px;
}

.stat .label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--muted);
}

.stat .value {
  font-size: 18px;
  font-weight: 600;
}

.mode-switch {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.quick-stats {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.mode-button {
  flex: 1;
  min-width: 220px;
  padding: 13px 18px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(24, 13, 31, 0.85);
  color: var(--text);
  cursor: pointer;
  font-weight: 600;
  position: relative;
  overflow: hidden;
  transition: all 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.mode-button::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    135deg,
    rgba(45, 212, 191, 0.12),
    rgba(251, 113, 133, 0.1)
  );
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
}

.mode-button::before {
  content: "";
  position: absolute;
  inset: -2px;
  border-radius: 16px;
  border: 1px solid rgba(45, 212, 191, 0.35);
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
}

.mode-button:hover,
.mode-button:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(45, 212, 191, 0.62);
  box-shadow:
    0 0 0 1px rgba(45, 212, 191, 0.5),
    0 0 0 3px rgba(45, 212, 191, 0.16),
    0 0 0 5px rgba(251, 113, 133, 0.11),
    0 8px 16px rgba(12, 8, 20, 0.34);
}

.mode-button:hover::after,
.mode-button:focus-visible::after {
  opacity: 1;
}

.mode-button:hover::before,
.mode-button:focus-visible::before {
  opacity: 1;
}

.mode-button:focus-visible {
  outline: none;
}

.mode-button.active {
  background: linear-gradient(
    135deg,
    rgba(45, 212, 191, 0.37),
    rgba(251, 113, 133, 0.34)
  );
  border-color: transparent;
}

.mode-button.active:hover,
.mode-button.active:focus-visible {
  box-shadow:
    0 0 0 1px rgba(45, 212, 191, 0.62),
    0 0 0 3px rgba(45, 212, 191, 0.22),
    0 0 0 5px rgba(251, 113, 133, 0.16),
    0 10px 20px rgba(12, 8, 20, 0.36);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 24px;
  display: grid;
  gap: 20px;
  backdrop-filter: blur(8px);
}

.proteus-panel {
  margin-top: 24px;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.badge {
  background: rgba(45, 212, 191, 0.2);
  color: var(--text);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.badge.ghost {
  background: rgba(148, 163, 184, 0.15);
}

.formula-badge {
  background: linear-gradient(
    135deg,
    rgba(45, 212, 191, 0.2),
    rgba(251, 113, 133, 0.14)
  );
  border: 1px solid rgba(148, 163, 184, 0.35);
  border-radius: 12px;
  padding: 10px 14px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  color: #e8f0ff;
}

.formula-left {
  font-weight: 700;
  letter-spacing: 0.02em;
}

.formula-right {
  font-family: "Cambria Math", "Times New Roman", "Consolas", serif;
  font-weight: 600;
  color: #d6e7ff;
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.formula-equals {
  opacity: 0.85;
}

.fraction {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  line-height: 1.06;
}

.fraction .num {
  border-bottom: 1px solid rgba(214, 231, 255, 0.78);
  padding: 0 4px 2px;
}

.fraction .den {
  padding: 2px 4px 0;
}

.minus-sign {
  font-size: 18px;
  font-weight: 700;
  margin-right: 2px;
}

.diagram {
  background: #ffffff;
  border-radius: 18px;
  padding: 0;
  overflow: hidden;
  border: 1px solid rgba(15, 23, 42, 0.12);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.14);
}

.diagram svg {
  width: 100%;
  max-width: 420px;
}

.diagram img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 0;
}

.proteus-panel .diagram img {
  width: 100%;
  height: auto;
  object-fit: contain;
  object-position: center;
}

.proteus-panel .diagram {
  background: #dddccf;
}

.svg-label {
  font-size: 14px;
  fill: #0f172a;
  font-family: "Segoe UI", sans-serif;
}

.inputs h3 {
  font-size: 18px;
  margin-bottom: 12px;
}

.input-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
}

.input-grid label {
  display: grid;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
  background: rgba(24, 13, 31, 0.86);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
}

input {
  border-radius: 10px;
  border: 1px solid var(--border);
  padding: 10px 12px;
  font-size: 14px;
  background: rgba(20, 12, 29, 0.95);
  color: var(--text);
  width: 100%;
  outline: none;
}

input:focus {
  border-color: rgba(45, 212, 191, 0.7);
  box-shadow: 0 0 0 3px rgba(45, 212, 191, 0.2);
}

.hint {
  font-size: 12px;
  color: var(--muted);
  margin-top: 12px;
}

.results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
}

.result-card {
  background: rgba(23, 13, 30, 0.86);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  display: grid;
  gap: 8px;
}

.result-card .label {
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.result-card .value {
  font-size: 20px;
  font-weight: 600;
}

.chart-card {
  background: rgba(18, 11, 26, 0.9);
  border-radius: 16px;
  border: 1px solid rgba(45, 212, 191, 0.32);
  padding: 16px;
  height: 320px;
  box-shadow:
    inset 0 0 0 1px rgba(251, 113, 133, 0.16),
    0 10px 24px rgba(8, 6, 14, 0.4);
}

.note {
  color: #d2deef;
  font-size: 13px;
  line-height: 1.5;
}

.mode-features {
  background: rgba(22, 12, 30, 0.9);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  display: grid;
  gap: 10px;
}

.mode-features h3 {
  font-size: 16px;
}

.feature-list {
  padding-left: 18px;
  display: grid;
  gap: 6px;
  color: #bfd0e9;
  font-size: 13px;
}

.hidden {
  display: none;
}

@media (max-width: 1024px) {
  .page {
    padding: 28px 18px 42px;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .panel {
    padding: 20px;
  }

  .input-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .panel-header {
    flex-wrap: wrap;
    align-items: flex-start;
  }

  .formula-badge {
    max-width: 100%;
  }
}

@media (max-width: 720px) {
  .page {
    padding: 18px 12px 30px;
  }

  .hero {
    padding: 18px;
    border-radius: 16px;
    gap: 12px;
  }

  h1 {
    font-size: clamp(22px, 7vw, 30px);
  }

  .mode-switch {
    flex-direction: column;
  }

  .mode-button {
    min-width: 100%;
    padding: 12px 14px;
  }

  .quick-stats,
  .results,
  .input-grid {
    grid-template-columns: 1fr;
  }

  .panel {
    border-radius: 14px;
    padding: 16px;
    gap: 16px;
  }

  .panel-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .badge {
    align-self: flex-start;
  }

  .formula-badge {
    width: 100%;
    justify-content: center;
    font-size: 14px;
    gap: 8px;
    flex-wrap: wrap;
  }

  .chart-card {
    height: 250px;
    padding: 12px;
  }

  .feature-list {
    padding-left: 16px;
  }
}

@media (max-width: 420px) {
  .page {
    padding: 14px 10px 24px;
  }

  .hero,
  .panel {
    padding: 14px;
  }

  .formula-badge {
    justify-content: flex-start;
    font-size: 13px;
  }

  .formula-right {
    gap: 4px;
  }

  .stat .value {
    font-size: 16px;
  }

  .result-card .value {
    font-size: 18px;
  }

  input {
    font-size: 16px;
  }
}