:root {
  --bg: #0b1020;
  --panel: #121b2d;
  --panel-strong: #18263f;
  --panel-soft: #1e2d4f;
  --border: rgba(160, 188, 255, 0.25);
  --text: #edf3ff;
  --muted: #b1bfdc;
  --primary: #67d0ff;
  --primary-strong: #3eb2ff;
  --success: #7ee8b0;
  --warning: #ffce73;
  --danger: #ff8b8b;
  --shadow: rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(180deg, #0b1020 0%, #111a2d 100%);
  color: var(--text);
}

body {
  min-height: 100vh;
  padding: 32px 16px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  gap: 22px;
}

.top-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

.top-nav a, .top-nav button.nav-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 700;
  background: rgba(103, 208, 255, 0.08);
  border: 1px solid rgba(103, 208, 255, 0.28);
  padding: 0.7rem 1rem;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

.top-nav a:hover, .top-nav button.nav-link:hover {
  background: rgba(103, 208, 255, 0.16);
  border-color: var(--primary);
}

.top-nav .user-status {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.user-badge {
  background: rgba(126, 232, 176, 0.1);
  border: 1px solid rgba(126, 232, 176, 0.3);
  color: var(--success);
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
}

.logout-btn {
  background: rgba(255, 139, 139, 0.1) !important;
  border-color: rgba(255, 139, 139, 0.3) !important;
  color: var(--danger) !important;
}

.header {
  text-align: center;
  padding: 12px 0 4px;
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  color: var(--primary);
}

h1 {
  margin: 10px 0 8px;
  font-size: clamp(2rem, 3vw, 3rem);
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
}

.panel {
  background: rgba(18, 27, 45, 0.96);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px 20px;
  box-shadow: 0 12px 30px var(--shadow);
}

.encrypt-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin-top: 16px;
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field-group label {
  color: var(--muted);
  font-weight: 600;
}

.field-group input,
.field-group select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(8, 14, 24, 0.68);
  color: var(--text);
  padding: 0.8rem 0.9rem;
  font-size: 1rem;
}

.field-group input:focus,
.field-group select:focus {
  outline: 2px solid rgba(103, 208, 255, 0.35);
}

.hidden-field {
  display: none;
}

.output-box {
  margin-top: 18px;
  background: rgba(8, 14, 24, 0.7);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  min-height: 120px;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: "Consolas", "Courier New", monospace;
  line-height: 1.5;
}

h2 {
  margin-top: 0;
  margin-bottom: 16px;
  font-size: 1.25rem;
}

textarea {
  width: 100%;
  min-height: 180px;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 16px;
  background: rgba(8, 14, 24, 0.68);
  color: var(--text);
  font-family: "Consolas", "Courier New", monospace;
  font-size: 1rem;
  letter-spacing: 0.06em;
  line-height: 1.5;
}

textarea:focus {
  outline: 2px solid rgba(103, 208, 255, 0.45);
  border-color: var(--primary);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

button {
  border: none;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: #041827;
  font-weight: 700;
  padding: 0.9rem 1.3rem;
  cursor: pointer;
  transition: transform 0.16s ease, box-shadow 0.16s ease;
  box-shadow: 0 8px 16px rgba(62, 178, 255, 0.25);
}

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

button.secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: none;
}

.alert {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 12px;
  font-weight: 600;
  border: 1px solid transparent;
}

.alert.info {
  background: rgba(103, 208, 255, 0.08);
  border-color: rgba(103, 208, 255, 0.35);
  color: var(--primary);
}

.alert.warning {
  background: rgba(255, 206, 115, 0.08);
  border-color: rgba(255, 206, 115, 0.35);
  color: var(--warning);
}

.alert.error {
  background: rgba(255, 139, 139, 0.08);
  border-color: rgba(255, 139, 139, 0.4);
  color: var(--danger);
}

.hidden {
  display: none !important;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
}

.stat-card {
  background: var(--panel-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
}

.stat-card .label {
  display: block;
  color: var(--muted);
  font-size: 0.82rem;
  margin-bottom: 8px;
}

.stat-card .value {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  word-wrap: break-word;
}

.method-box {
  background: rgba(110, 180, 255, 0.08);
  border: 1px solid rgba(110, 180, 255, 0.32);
  border-radius: 12px;
  padding: 18px;
  line-height: 1.6;
}

.result-panel {
  overflow: hidden;
}

.result-content {
  background: rgba(8, 14, 24, 0.8);
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 18px 16px;
  overflow: auto;
}

.result-header {
  margin-bottom: 12px;
}

.kv {
  margin: 8px 0;
  line-height: 1.7;
}

.kv strong {
  color: var(--primary);
}

.pre {
  white-space: pre-wrap;
  word-break: break-word;
  font-family: "Consolas", "Courier New", monospace;
  background: rgba(255, 255, 255, 0.025);
  border-radius: 10px;
  padding: 12px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.table-wrap {
  overflow-x: auto;
  margin-top: 18px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.96rem;
}

th, td {
  padding: 8px 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--primary);
  background: rgba(255, 255, 255, 0.02);
}

details {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.02);
  padding: 0 12px;
}

summary {
  cursor: pointer;
  padding: 14px 0;
  font-weight: 700;
  color: var(--primary);
}

#detallesContenido {
  padding: 0 0 14px;
  color: var(--muted);
  line-height: 1.7;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================================
   ESTILOS ESPECÍFICOS PARA LOGIN Y AUTENTICACIÓN (GUÍA DE LABORATORIO)
   ========================================================================== */
.login-container {
  max-width: 460px;
  margin: 40px auto;
}

.login-card {
  background: rgba(18, 27, 45, 0.98);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 36px 28px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

.login-card h2 {
  text-align: center;
  font-size: 1.6rem;
  margin-bottom: 8px;
  color: var(--text);
}

.login-card .login-subtitle {
  text-align: center;
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 0;
  margin-bottom: 24px;
}

.login-card form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.login-card .form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.login-card label {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
}

.login-card input[type="text"],
.login-card input[type="password"] {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(8, 14, 24, 0.85);
  color: var(--text);
  padding: 0.9rem 1rem;
  font-size: 1rem;
  transition: border-color 0.2s ease, outline 0.2s ease;
}

.login-card input:focus {
  outline: 2px solid var(--primary);
  border-color: var(--primary);
}

.login-card button[type="submit"] {
  width: 100%;
  margin-top: 10px;
  padding: 1rem;
  font-size: 1.05rem;
}

.demo-credentials {
  margin-top: 24px;
  padding: 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px dashed var(--border);
  border-radius: 12px;
  font-size: 0.82rem;
  color: var(--muted);
}

.demo-credentials strong {
  color: var(--primary);
}

.demo-credentials ul {
  margin: 6px 0 0;
  padding-left: 18px;
}

@media (max-width: 680px) {
  body {
    padding: 16px 10px;
  }

  .panel {
    padding: 18px 14px;
  }

  textarea {
    min-height: 150px;
    font-size: 0.95rem;
  }

  .login-container {
    margin-top: 15px;
  }
}