/* ==========================================
   Acid–Base Status - EN
   Light Clinical Blue Version
========================================== */

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

:root {
  --bg: #F8FAFC;
  --panel: #FFFFFF;
  --accent: #38BDF8;          /* Azul celeste */
  --accent-hover: #0EA5E9;    /* Azul celeste fuerte */
  --text: #0F172A;
  --muted: #64748B;
  --border: #E2E8F0;
  --radius: 12px;
  --maxw: 1000px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 40px 20px 60px;
}

/* ================= BREADCRUMB ================= */

.breadcrumb {
  margin-bottom: 20px;
  font-size: 0.9rem;
  color: var(--muted);
}

.breadcrumb a {
  color: var(--accent-hover);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

/* ================= HEADER ================= */

.app-header {
  margin-bottom: 30px;
}

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

/* ================= PANEL ================= */

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 25px;
  margin-bottom: 30px;
  box-shadow: 0 6px 20px rgba(14,165,233,0.05);
}

.panel h2 {
  margin-bottom: 15px;
}

/* ================= FORM ================= */

label {
  display: block;
  margin-top: 12px;
  font-size: 0.9rem;
  color: var(--muted);
}

input {
  width: 100%;
  padding: 8px;
  margin-top: 5px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #FFFFFF;
  color: var(--text);
}

input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(56,189,248,0.2);
}

/* ================= BUTTON ================= */

button {
  margin-top: 15px;
  padding: 10px 15px;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: white;
  cursor: pointer;
  font-weight: 500;
  transition: 0.2s ease;
}

button:hover {
  background: var(--accent-hover);
}

/* ================= RESULT ================= */

.result {
  margin-top: 15px;
  padding: 12px;
  border-radius: 8px;
  background: #E0F2FE;
  border: 1px solid rgba(14,165,233,0.4);
  font-size: 0.95rem;
}

.note {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.9rem;
}

/* ================= TABLE ================= */

.table-wrapper {
  margin-top: 40px;
}

.acid-base-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 15px;
}

.acid-base-table th,
.acid-base-table td {
  border: 1px solid var(--border);
  padding: 10px;
  font-size: 0.9rem;
}

.acid-base-table .section th {
  background: #F1F5F9;
  color: var(--accent-hover);
}

/* ================= FOOTER ================= */

.footer-nav a {
  color: var(--accent-hover);
  text-decoration: none;
  margin: 0 8px;
}

.footer-nav a:hover {
  text-decoration: underline;
}

footer {
  margin-top: 40px;
  text-align: center;
  border-top: 1px solid var(--border);
  padding-top: 20px;
  color: var(--muted);
}

/* ================= RESPONSIVE ================= */

@media (max-width: 768px) {
  .container {
    padding: 25px 15px 50px;
  }
}