:root {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-primary: #93c5fd;
  --color-primary-dark: #60a5fa;
  --color-primary-light: #dbeafe;
  --color-accent: #fca5a5;
  --color-text: #334155;
  --color-muted: #64748b;
  --color-border: #e2e8f0;
  --color-success: #86efac;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.04);
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --radius: 0.75rem;
  --radius-lg: 1rem;
  --max-width: 900px;
  --header-height: 4rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
}

.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  height: var(--header-height);
  display: flex;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary-dark);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.brand:hover {
  color: var(--color-text);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logout-form {
  margin: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
}

.btn-secondary {
  background: var(--color-primary-light);
  color: var(--color-text);
}

.btn-secondary:hover {
  background: var(--color-primary);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: var(--color-muted);
  border-color: var(--color-border);
}

.btn-ghost:hover {
  background: var(--color-bg);
  color: var(--color-text);
}

.btn-google {
  background: #ffffff;
  color: #3c4043;
  border-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.btn-google:hover {
  background: var(--color-bg);
}

.btn-google::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 18px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%234285F4' d='M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92c-.26 1.37-1.04 2.53-2.21 3.31v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.09z'/%3E%3Cpath fill='%2334A853' d='M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z'/%3E%3Cpath fill='%23FBBC05' d='M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l2.85-2.22.81-.62z'/%3E%3Cpath fill='%23EA4335' d='M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53z'/%3E%3C/svg%3E") no-repeat center/contain;
}

.btn-large {
  padding: 0.875rem 1.5rem;
  font-size: 1.1rem;
  border-radius: var(--radius-lg);
}

.main {
  flex: 1;
}

.hero {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-bg) 100%);
  padding: 5rem 1rem;
  text-align: center;
}

.hero-inner {
  max-width: 640px;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin: 0 0 1rem;
  color: var(--color-text);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-muted);
  margin: 0 0 2rem;
}

.features {
  padding: 3rem 1rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.feature-card h2 {
  margin-top: 0;
  font-size: 1.15rem;
  color: var(--color-primary-dark);
}

.feature-card p {
  margin-bottom: 0;
  color: var(--color-muted);
}

.coming-soon {
  padding: 3rem 1rem;
  text-align: center;
}

.coming-soon h2 {
  margin-top: 0;
}

.page-section {
  padding: 3rem 1rem;
}

.page-section h1 {
  margin-top: 0;
}

.narrow {
  max-width: 680px;
}

.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
}

.faq-item summary {
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  font-size: 1.25rem;
  color: var(--color-primary-dark);
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item p {
  margin: 0.75rem 0 0;
  color: var(--color-muted);
}

.dashboard-placeholder {
  background: var(--color-surface);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  margin-top: 2rem;
}

.dashboard-placeholder code {
  background: var(--color-bg);
  padding: 0.15rem 0.4rem;
  border-radius: 0.35rem;
  font-size: 0.9em;
}

.dashboard-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.dashboard-card h2 {
  margin-top: 0;
  margin-bottom: 0.75rem;
  font-size: 1.1rem;
  color: var(--color-text);
}

.dashboard-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.dashboard-card-header h2 {
  margin-bottom: 0;
}

.account-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.account-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
}

.account-item:last-child {
  border-bottom: none;
}

.account-email {
  font-weight: 500;
  color: var(--color-text);
}

.hint {
  font-size: 0.9rem;
  margin-top: 0.75rem;
  margin-bottom: 0;
}

.btn-small {
  padding: 0.35rem 0.75rem;
  font-size: 0.85rem;
}

.invite-calendar {
  border-top: 1px solid var(--color-border);
  margin-top: 1.25rem;
  padding-top: 1.25rem;
}

.invite-calendar h3 {
  margin: 0 0 0.5rem;
}

.invite-form label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.invite-form-row {
  display: flex;
  gap: 0.75rem;
}

.invite-form-row input {
  flex: 1;
  min-width: 0;
  min-height: 3.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  font: inherit;
  font-size: 1.05rem;
}

.invite-link-wrap {
  margin-top: 1rem;
}

.invite-link-wrap textarea {
  box-sizing: border-box;
  display: block;
  width: 100%;
  min-height: 6rem;
  margin-bottom: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  font: 0.9rem/1.4 monospace;
  resize: vertical;
}

@media (max-width: 600px) {
  .invite-form-row { flex-direction: column; }
}

/* Preferences page */
.preferences-form label.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-weight: 600;
}

.preferences-form label.field input,
.preferences-form label.field select {
  font: inherit;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.address-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.address-grid .span-2 {
  grid-column: span 2;
}

.dynamic-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.dynamic-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.dynamic-row input {
  flex: 1;
  font: inherit;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.dynamic-row .dynamic-label {
  flex: 0 0 8rem;
}

.toggle-row {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.75rem;
  margin: 0.5rem 0;
  cursor: pointer;
  font-weight: 600;
}

.reminder-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
}

.reminder-row input {
  width: 6rem;
  font: inherit;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

@media (max-width: 600px) {
  .reminder-row {
    flex-wrap: wrap;
  }
}

.toggle-row input[type="checkbox"] {
  width: 1.25rem;
  height: 1.25rem;
  accent-color: var(--color-primary-dark);
}

.preferences-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
}

.danger-zone {
  border-color: #fecaca;
  background: #fef2f2;
  margin-top: 2.5rem;
}

.danger-zone h2 {
  color: #b91c1c;
}

.btn-danger {
  background: #ef4444;
  color: #fff;
  border-color: #ef4444;
}

.btn-danger:hover {
  background: #dc2626;
  border-color: #dc2626;
}

.btn-danger:disabled {
  background: #fca5a5;
  border-color: #fca5a5;
  cursor: not-allowed;
}

@media (max-width: 600px) {
  .address-grid {
    grid-template-columns: 1fr;
  }
  .address-grid .span-2 {
    grid-column: span 1;
  }
  .dynamic-row {
    flex-wrap: wrap;
  }
  .dynamic-row .dynamic-label {
    flex: 1 1 100%;
  }
}

.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 1rem;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.site-footer a {
  color: var(--color-primary-dark);
  text-decoration: none;
}

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

.separator {
  margin: 0 0.5rem;
}

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

@media (max-width: 480px) {
  .nav-actions {
    gap: 0.5rem;
  }

  .btn {
    padding: 0.4rem 0.75rem;
    font-size: 0.9rem;
  }

  .hero {
    padding: 3rem 1rem;
  }
}