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

:root {
  --deep-blue: #0b1628;
  --navy: #132743;
  --teal: #1a7a6d;
  --teal-light: #2ec4b6;
  --coral: #e76f51;
  --coral-light: #f4a261;
  --sea-foam: #a8dadc;
  --white: #f1faee;
  --green: #2ecc71;
  --red: #e74c3c;
  --gray: #457b9d;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--deep-blue);
  color: var(--white);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: linear-gradient(135deg, var(--navy), var(--teal));
  padding: 2rem;
  text-align: center;
  border-bottom: 3px solid var(--teal-light);
  position: relative;
}

header h1 {
  font-size: 2rem;
  letter-spacing: 0.05em;
}

.tagline {
  color: var(--sea-foam);
  margin-top: 0.25rem;
  font-size: 0.95rem;
}

main {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1rem;
  flex: 1;
  width: 100%;
}

.add-monitor {
  background: var(--navy);
  border-radius: 8px;
  padding: 1.25rem;
  margin-bottom: 2rem;
  border: 1px solid var(--gray);
}

.add-monitor h2 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
  color: var(--teal-light);
}

#add-form {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

#add-form input,
#add-form select {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--gray);
  border-radius: 4px;
  background: var(--deep-blue);
  color: var(--white);
  font-size: 0.9rem;
}

#add-form input[type="text"] { flex: 1; min-width: 120px; }
#add-form input[type="url"] { flex: 2; min-width: 200px; }

#add-form button {
  padding: 0.5rem 1.25rem;
  background: var(--teal);
  color: var(--white);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  transition: background 0.2s;
}

#add-form button:hover {
  background: var(--teal-light);
  color: var(--deep-blue);
}

.monitors {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.loading {
  text-align: center;
  color: var(--gray);
  padding: 2rem;
}

.monitor-card {
  background: var(--navy);
  border-radius: 8px;
  padding: 1.25rem;
  border: 1px solid var(--gray);
  transition: border-color 0.2s;
}

.monitor-card:hover {
  border-color: var(--teal-light);
}

.monitor-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.monitor-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.status-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.status-dot.up { background: var(--green); box-shadow: 0 0 6px var(--green); }
.status-dot.down { background: var(--red); box-shadow: 0 0 6px var(--red); }
.status-dot.unknown { background: var(--gray); }

.monitor-name {
  font-weight: 600;
  font-size: 1.05rem;
}

.monitor-url {
  color: var(--gray);
  font-size: 0.8rem;
}

.monitor-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.uptime-badge {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--sea-foam);
}

.delete-btn {
  background: none;
  border: 1px solid var(--coral);
  color: var(--coral);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.2s;
}

.delete-btn:hover {
  background: var(--coral);
  color: var(--white);
}

.monitor-details {
  display: flex;
  gap: 1.5rem;
  font-size: 0.8rem;
  color: var(--gray);
  margin-bottom: 0.75rem;
}

.sparkline-container {
  height: 32px;
  display: flex;
  align-items: end;
  gap: 1px;
}

.sparkline-bar {
  width: 6px;
  border-radius: 2px 2px 0 0;
  min-height: 2px;
  transition: height 0.2s;
}

.sparkline-bar.up { background: var(--teal-light); }
.sparkline-bar.down { background: var(--coral); }
.sparkline-bar.slow { background: var(--coral-light); }

/* Auth controls */
.auth-controls {
  position: absolute;
  top: 50%;
  right: 1.5rem;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.auth-btn {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--sea-foam);
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  transition: all 0.2s;
}

.auth-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: var(--teal-light);
  color: var(--white);
}

.auth-btn.authenticated {
  color: var(--teal-light);
  border-color: var(--teal-light);
}

.logout-btn span {
  font-size: 0.8rem;
}

/* Login Modal */
.auth-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.auth-modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(11, 22, 40, 0.85);
  backdrop-filter: blur(4px);
}

.auth-modal-content {
  position: relative;
  background: var(--navy);
  border: 1px solid var(--teal);
  border-radius: 12px;
  padding: 2rem;
  width: 90%;
  max-width: 360px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.auth-modal-content h2 {
  color: var(--teal-light);
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
}

.auth-modal-desc {
  color: var(--gray);
  font-size: 0.85rem;
  margin-bottom: 1.25rem;
}

#login-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

#login-password {
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--gray);
  border-radius: 6px;
  background: var(--deep-blue);
  color: var(--white);
  font-size: 0.95rem;
  text-align: center;
  letter-spacing: 0.1em;
}

#login-password:focus {
  outline: none;
  border-color: var(--teal-light);
  box-shadow: 0 0 0 2px rgba(46, 196, 182, 0.2);
}

.login-error {
  color: var(--coral);
  font-size: 0.85rem;
}

.login-submit {
  padding: 0.6rem 1.25rem;
  background: var(--teal);
  color: var(--white);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.2s;
}

.login-submit:hover {
  background: var(--teal-light);
  color: var(--deep-blue);
}

footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--gray);
  font-size: 0.8rem;
  border-top: 1px solid var(--navy);
}