:root {
  --bg-1: #f3f9ff;
  --bg-2: #d9ecff;
  --ink: #1b3a57;
  --muted: #5a7692;
  --line: #bfd8ec;
  --primary: #3a8fd8;
  --primary-2: #2f79be;
  --danger: #b91c1c;
  --card: rgba(255, 255, 255, 0.84);
  --shadow: 0 12px 40px rgba(27, 58, 87, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Google Sans', sans-serif;
  color: var(--ink);
  background: linear-gradient(125deg, var(--bg-1), var(--bg-2));
  position: relative;
  overflow-x: hidden;
}

.background-orb {
  position: fixed;
  z-index: -1;
  border-radius: 999px;
  filter: blur(8px);
}

.background-orb-left {
  width: 340px;
  height: 340px;
  top: -90px;
  left: -110px;
  background: rgba(74, 160, 230, 0.24);
}

.background-orb-right {
  width: 280px;
  height: 280px;
  bottom: -80px;
  right: -90px;
  background: rgba(53, 126, 191, 0.18);
}

.page {
  width: min(1024px, 92vw);
  margin: 0 auto;
  padding: 44px 0 56px;
  animation: reveal 500ms ease-out;
}

.page-header h1 {
  margin: 8px 0 12px;
  font-size: clamp(1.8rem, 2.8vw, 2.8rem);
  letter-spacing: -0.03em;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  color: var(--primary-2);
  font-weight: 700;
  margin: 0;
}

.subtitle {
  max-width: 700px;
  color: var(--muted);
  margin: 0;
}

.panel {
  margin-top: 22px;
  border: 1px solid rgba(191, 216, 236, 0.88);
  background: var(--card);
  backdrop-filter: blur(14px);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 20px;
}

.compare-form {
  display: grid;
  gap: 14px;
}

.field-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

.field-group input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.9);
  font: inherit;
}

.field-group input:focus {
  outline: 2px solid rgba(58, 143, 216, 0.26);
  border-color: var(--primary);
}

.field-inline {
  display: flex;
  align-items: center;
  gap: 10px;
}

.switch {
  width: 52px;
  height: 30px;
  position: relative;
}

.switch input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.switch-slider {
  position: absolute;
  inset: 0;
  border-radius: 999px;
  background: #aac7de;
  transition: background 180ms ease;
}

.switch-slider::before {
  content: '';
  position: absolute;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  top: 4px;
  left: 4px;
  background: #ffffff;
  transition: transform 180ms ease;
}

.switch input:checked + .switch-slider {
  background: var(--primary);
}

.switch input:checked + .switch-slider::before {
  transform: translateX(22px);
}

.button-primary,
.button-secondary,
.button-danger {
  border: none;
  border-radius: 12px;
  padding: 10px 14px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.button-primary {
  background: linear-gradient(140deg, var(--primary), var(--primary-2));
  color: #ffffff;
}

.button-secondary {
  background: #e7f2fb;
  color: var(--ink);
}

.button-danger {
  background: #fee2e2;
  color: var(--danger);
}

.result-card {
  margin-top: 20px;
  border-radius: 14px;
  border: 1px dashed var(--line);
  padding: 16px;
  background: rgba(255, 255, 255, 0.7);
}

.result-card h2,
.history-header h2 {
  margin: 0;
}

.result-card-empty {
  color: var(--muted);
}

.result-stats {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 10px;
}

.stat-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
  background: #ffffff;
}

.stat-label {
  margin: 0 0 5px;
  font-size: 0.84rem;
  color: var(--muted);
}

.stat-value {
  margin: 0;
  font-weight: 700;
  font-size: 1.03rem;
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.history-list {
  margin-top: 14px;
  display: grid;
  gap: 10px;
}

.history-item {
  display: grid;
  gap: 10px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #ffffff;
  padding: 12px;
  animation: item-enter 240ms ease;
}

.history-meta {
  display: grid;
  gap: 4px;
  color: var(--muted);
}

.history-empty {
  margin: 0;
  color: var(--muted);
}

.history-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.profile-panel {
  margin-bottom: 18px;
}

.profile-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  margin-bottom: 14px;
}

.profile-header h2 {
  margin: 4px 0 6px;
}

.profile-email {
  margin: 0;
  color: var(--muted);
}

.profile-form {
  display: grid;
  gap: 10px;
  max-width: 520px;
}

.profile-message {
  margin: 12px 0 0;
  color: var(--primary-2);
  font-weight: 600;
}

.profile-message-error {
  color: var(--danger);
}

@media (max-width: 640px) {
  .page {
    padding-top: 28px;
  }

  .panel {
    padding: 14px;
  }

  .profile-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

@keyframes reveal {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes item-enter {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Auth UI tweaks */
.auth-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.auth-brand h1 {
  margin: 0 0 6px 0;
  font-size: 1.5rem;
}
.auth-brand .subtitle {
  margin: 0;
  color: var(--muted);
}
.auth-form .field-group {
  margin-bottom: 8px;
}
#toggle-password.button-secondary {
  position: absolute;
  right: 10px;
  top: 32px;
  padding: 6px 10px;
  font-size: 0.85rem;
}
.auth-error {
  background: rgba(255, 230, 230, 0.9);
  border: 1px solid #f5c6cb;
  padding: 10px 12px;
  border-radius: 10px;
  color: #7a1b1b;
}