:root {
  --bg-primary: #0a0e17;
  --bg-card: #131b2e;
  --bg-card-hover: #1a253f;
  --bg-input: #1b2640;
  --border: #233152;
  --border-focus: #3b82f6;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --radius: 12px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  padding: 1.5rem;
  line-height: 1.5;
}

/* ─── NAVEGACIÓN ─── */
.top-nav {
  max-width: 1300px;
  margin: 0 auto 1.5rem auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text-primary);
}

.nav-icon {
  font-size: 1.5rem;
}

.nav-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.15s;
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.nav-btn {
  background: var(--accent);
  color: white !important;
  padding: 0.45rem 0.9rem;
  border-radius: 8px;
}
.nav-btn:hover {
  background: var(--accent-hover);
}

.nav-btn-admin {
  background: var(--bg-card);
  padding: 0.45rem 0.9rem;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.nav-btn-admin:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ─── BOTONES COMUNES ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1.1rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
}
.btn-primary { background-color: var(--accent); color: white; }
.btn-primary:hover { background-color: var(--accent-hover); }
.btn-outline { background: transparent; border-color: var(--border); color: var(--text-secondary); }
.btn-outline:hover { background: var(--bg-card); color: var(--text-primary); border-color: var(--text-muted); }
.btn-lg { padding: 0.85rem 1.85rem; font-size: 1rem; }
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; }
.btn-block { width: 100%; justify-content: center; }

/* ─── LANDING PAGE ─── */
.landing-hero {
  text-align: center;
  max-width: 820px;
  margin: 4rem auto 3rem auto;
  padding: 1rem;
}
.hero-badge {
  display: inline-block;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 0.35rem 1rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}
.hero-title {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.2rem;
  letter-spacing: -0.03em;
}
.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 2.2rem;
}
.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  max-width: 1200px;
  margin: 3.5rem auto;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
}
.feature-icon {
  font-size: 2.2rem;
  margin-bottom: 0.75rem;
}
.feature-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}
.feature-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ─── AUTH (LOGIN & REGISTER) ─── */
.auth-card {
  max-width: 440px;
  margin: 3.5rem auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.25rem;
}
.auth-header {
  text-align: center;
  margin-bottom: 1.5rem;
}
.auth-header h2 {
  font-size: 1.4rem;
  font-weight: 700;
}
.auth-header p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}
.auth-error-msg {
  color: var(--danger);
  font-size: 0.85rem;
  margin-bottom: 1rem;
  text-align: center;
  min-height: 1.2rem;
}
.auth-footer {
  text-align: center;
  margin-top: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.auth-footer a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

/* ─── PORTAL CLIENTE / DASHBOARD ─── */
.dashboard-wrapper {
  max-width: 1300px;
  margin: 0 auto;
}
.tenant-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}
.tenant-user {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.user-avatar { font-size: 2.2rem; }
.user-email { font-size: 1.15rem; font-weight: 700; }
.tenant-role { font-size: 0.75rem; color: var(--accent); text-transform: uppercase; font-weight: 700; }
.tenant-stats {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.credits-pill {
  background: var(--bg-input);
  border: 1px solid var(--border);
  padding: 0.5rem 1rem;
  border-radius: 10px;
  display: flex;
  flex-direction: column;
}
.pill-label { font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; font-weight: 600; }
.pill-val { font-size: 1rem; color: var(--text-primary); }
.pill-val strong { color: var(--success); }

.api-key-box {
  background: var(--bg-card);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.api-key-info h4 { font-size: 0.95rem; font-weight: 700; }
.api-key-info p { font-size: 0.8rem; color: var(--text-secondary); margin-top: 0.2rem; }
.api-key-display code {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-family: monospace;
  color: var(--success);
  font-size: 0.95rem;
  user-select: all;
}

.channel-action {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  margin-bottom: 1.25rem;
}
.channel-text strong { display: block; font-size: 0.9rem; }
.channel-text p { font-size: 0.75rem; color: var(--text-secondary); margin-top: 0.15rem; }
.field-hint { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.2rem; }

/* ─── GRID PRINCIPAL DE 2 COLUMNAS ─── */
.main-grid {
  display: grid;
  grid-template-columns: 460px 1fr;
  gap: 1.5rem;
}
@media (max-width: 980px) {
  .main-grid { grid-template-columns: 1fr; }
}
.column { display: flex; flex-direction: column; }
.panel {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.panel-spacing { margin-top: 1.5rem; }
.panel-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.panel-header h3 { font-size: 1rem; font-weight: 700; }
.count-badge {
  background: var(--bg-input);
  border: 1px solid var(--border);
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
}
.panel-body { padding: 1.25rem; }

/* ─── FORMULARIOS ─── */
.sms-form, .settings-form, .auth-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.form-field { display: flex; flex-direction: column; gap: 0.4rem; }
.form-field label { font-size: 0.8rem; font-weight: 600; color: var(--text-secondary); }
input[type="text"], input[type="password"], textarea {
  width: 100%;
  background-color: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 0.9rem;
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s;
}
input[type="text"]:focus, input[type="password"]:focus, textarea:focus { border-color: var(--border-focus); }
textarea { resize: vertical; min-height: 95px; }
.char-counter { display: flex; justify-content: space-between; font-size: 0.75rem; color: var(--text-muted); margin-top: 0.25rem; }
.btn-send {
  background-color: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 0.75rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.15s;
}
.btn-send:hover { background-color: var(--accent-hover); }

/* ─── LISTAS DE SMS (INBOX & OUTBOX) ─── */
.sms-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-height: 520px;
  overflow-y: auto;
  padding-right: 0.3rem;
}
.sms-card {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.inbox-card { cursor: pointer; transition: border-color 0.15s; }
.inbox-card:hover { border-color: var(--accent); }
.sms-card-header { display: flex; justify-content: space-between; align-items: center; font-size: 0.8rem; }
.sms-phone { color: var(--accent); }
.sms-text { font-size: 0.9rem; color: var(--text-primary); word-break: break-word; line-height: 1.45; }
.error-text { font-size: 0.75rem; color: var(--danger); margin-top: 0.25rem; }
.csq-pill { font-size: 0.7rem; background: rgba(255, 255, 255, 0.06); padding: 0.15rem 0.45rem; border-radius: 6px; color: var(--text-muted); }
.badge { display: inline-block; padding: 0.2rem 0.55rem; border-radius: 9999px; font-size: 0.65rem; font-weight: 700; text-transform: uppercase; }
.badge-sent { background: rgba(16, 185, 129, 0.15); color: var(--success); }
.badge-sending { background: rgba(245, 158, 11, 0.15); color: var(--warning); }
.badge-pending { background: rgba(59, 130, 246, 0.15); color: var(--accent); }
.badge-failed { background: rgba(239, 68, 68, 0.15); color: var(--danger); }
.empty-state { text-align: center; color: var(--text-muted); font-size: 0.85rem; padding: 2rem 1rem; }

/* ─── ADMIN CONSOLE & TELEMETRÍA ─── */
.admin-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}
.admin-subtitle { font-size: 0.85rem; color: var(--text-secondary); margin-top: 0.25rem; }
.telemetry-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1.75rem;
}
.telemetry-item {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.telemetry-label { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-secondary); font-weight: 600; }
.telemetry-val { font-size: 1.15rem; font-weight: 700; display: flex; align-items: center; gap: 0.5rem; color: var(--text-primary); }
.status-dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.status-dot.online { background-color: var(--success); box-shadow: 0 0 8px var(--success); }
.status-dot.offline { background-color: var(--danger); box-shadow: 0 0 8px var(--danger); }
.ota-desc { font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 1.25rem; line-height: 1.5; }
.firmware-table-container { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; text-align: left; font-size: 0.875rem; }
.data-table th, .data-table td { padding: 0.85rem 1rem; border-bottom: 1px solid var(--border); }
.data-table th { color: var(--text-muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; }

/* ─── FOOTER ─── */
.app-footer {
  max-width: 1300px;
  margin: 2.5rem auto 1rem auto;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
}