/* VARIABLES CSS */
* {
  box-sizing: border-box;
  margin: 0;
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    "Helvetica Neue",
    sans-serif;
}

body {
  --bg-body: #e7ecf3;
  --bg-container: #ffffff;
  --bg-input-card: #f2f6fc;
  --bg-output-card: #ffffff;
  --text-primary: #0a1a2b;
  --text-secondary: #2a4059;
  --text-muted: #3f5670;
  --border-light: #cddae9;
  --accent: #1f4a9c;
  --accent-hover: #123670;
  --shadow: 0 12px 28px rgba(0, 20, 40, 0.08);
  --btn-bg: #1e2f44;
  --btn-text: white;
  --footnote-bg: #e2ecf9;
  --footnote-border: #c2d6ed;
  --result-bg: #f9fcff;
  --tooltip-bg: #1e2f44;
  --tooltip-text: #f0f5fc;
  transition:
    background-color 0.2s,
    color 0.2s;
}

body.dark-mode {
  --bg-body: #10161e;
  --bg-container: #1f2a36;
  --bg-input-card: #26323f;
  --bg-output-card: #1f2a36;
  --text-primary: #f0f5fc;
  --text-secondary: #cbd8ea;
  --text-muted: #9db1cc;
  --border-light: #3a4a5e;
  --accent: #5987d4;
  --accent-hover: #76a3ed;
  --shadow: 0 12px 28px rgba(0, 0, 0, 0.4);
  --btn-bg: #3265a8;
  --btn-text: #ffffff;
  --footnote-bg: #1e2f3f;
  --footnote-border: #2e4057;
  --result-bg: #26323f;
  --tooltip-bg: #d0ddea;
  --tooltip-text: #0a1a2b;
}

body {
  background: var(--bg-body);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 20px;
}

.container {
  max-width: 1100px;
  width: 100%;
  background: var(--bg-container);
  border-radius: 28px;
  box-shadow: var(--shadow);
  padding: 2rem 2rem 1.8rem;
  transition: background 0.2s;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.8rem;
  flex-wrap: wrap;
  gap: 1rem;
}

h1 {
  font-size: 1.9rem;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin: 0;
  border-left: 5px solid var(--accent);
  padding-left: 1.2rem;
}

.dark-toggle {
  background: var(--bg-input-card);
  border: 1px solid var(--border-light);
  border-radius: 40px;
  padding: 0.4rem 1.2rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: 0.2s;
  user-select: none;
}

.dark-toggle:hover {
  background: var(--border-light);
}

.input-card,
.output-card {
  background: var(--bg-input-card);
  border-radius: 20px;
  padding: 1.8rem 1.8rem 2rem;
  margin-bottom: 1.8rem;
  box-shadow:
    inset 0 1px 2px rgba(255, 255, 255, 0.05),
    0 4px 14px rgba(0, 0, 0, 0.02);
  border: 1px solid var(--border-light);
}

.output-card {
  background: var(--bg-output-card);
}

.grupo {
  margin-bottom: 2rem;
}

.grupo h3 {
  font-weight: 500;
  font-size: 1.3rem;
  color: var(--text-secondary);
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.grupo h3::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 22px;
  background: var(--accent);
  border-radius: 8px;
}

.fields-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem 1.5rem;
}

.field {
  flex: 1 1 200px;
  min-width: 170px;
}

.field label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.field input {
  width: 100%;
  padding: 0.7rem 0.9rem;
  font-size: 1rem;
  background: var(--bg-container);
  border: 1px solid var(--border-light);
  border-radius: 14px;
  transition:
    border 0.2s,
    box-shadow 0.2s;
  outline: none;
  font-weight: 400;
  color: var(--text-primary);
}

.field input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(89, 135, 212, 0.25);
}

.field input::placeholder {
  color: var(--text-muted);
  opacity: 0.6;
  font-size: 0.9rem;
}

.btn-calcular {
  background: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  width: 100%;
  padding: 1rem 1.5rem;
  font-size: 1.2rem;
  font-weight: 500;
  border-radius: 50px;
  cursor: pointer;
  transition:
    background 0.2s,
    transform 0.1s;
  margin-top: 0.5rem;
  letter-spacing: 0.2px;
  box-shadow: 0 6px 16px rgba(0, 30, 60, 0.2);
}

.btn-calcular:hover {
  background: var(--accent-hover);
}

.btn-calcular:active {
  transform: scale(0.98);
}

/* RESULTADOS GRID */
.resultados-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem 2rem;
  background: var(--result-bg);
  padding: 1.5rem;
  border-radius: 18px;
  border: 1px solid var(--border-light);
  margin-bottom: 1.2rem;
}

.result-item {
  display: flex;
  flex-direction: column;
}

.result-item .label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 0.15rem;
}

.tooltip-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--text-muted);
  color: var(--bg-container);
  font-size: 0.65rem;
  font-weight: bold;
  cursor: help;
  position: relative;
  transition: background 0.2s;
}

.tooltip-icon:hover {
  background: var(--accent);
}

.tooltip-icon::before {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 150%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--tooltip-bg);
  color: var(--tooltip-text);
  font-size: 0.7rem;
  font-weight: normal;
  text-transform: none;
  white-space: nowrap;
  padding: 0.4rem 0.8rem;
  border-radius: 20px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease;
  z-index: 10;
  letter-spacing: normal;
  border: 1px solid var(--border-light);
}

.tooltip-icon:hover::before {
  opacity: 1;
}

.tooltip-icon::after {
  content: "";
  position: absolute;
  bottom: 140%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 5px;
  border-style: solid;
  border-color: var(--tooltip-bg) transparent transparent transparent;
  opacity: 0;
  transition: opacity 0.15s ease;
  pointer-events: none;
  z-index: 10;
}

.tooltip-icon:hover::after {
  opacity: 1;
}

.result-item .valor {
  font-size: 1.9rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.2;
}

.result-item .valor small {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-left: 4px;
}

.result-desc {
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-top: 2px;
  font-style: italic;
  line-height: 1.2;
}

.separator-light {
  width: 100%;
  height: 1px;
  background: linear-gradient(to right, var(--border-light), transparent);
  margin: 1.2rem 0 1rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.footnote {
  font-size: 0.78rem;
  color: var(--text-muted);
  background: var(--footnote-bg);
  padding: 0.9rem 1.4rem;
  border-radius: 40px;
  text-align: center;
  border: 1px solid var(--footnote-border);
}

.disclaimer {
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--footnote-bg);
  padding: 0.6rem 1.2rem;
  border-radius: 30px;
  text-align: center;
  border: 1px solid var(--footnote-border);
  margin-top: 0.5rem;
}

.github-link {
  font-size: 0.8rem;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dashed var(--accent);
}

.github-link:hover {
  opacity: 0.8;
}

@media (max-width: 650px) {
  .container {
    padding: 1.2rem;
  }
  .resultados-grid {
    grid-template-columns: 1fr;
  }
  .result-item .valor {
    font-size: 1.6rem;
  }
  .tooltip-icon::before {
    white-space: normal;
    width: 150px;
    text-align: center;
  }
}