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

body {
  background-color: var(--color-ground);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background-color: var(--color-accent);
  color: #ffffff;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.1;
  text-wrap: balance;
  letter-spacing: -0.02em;
}

p {
  text-wrap: pretty;
  max-width: 68ch;
}

.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--color-ink);
}

.brand-icon {
  width: 22px;
  height: 22px;
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
}

.nav-link {
  text-decoration: none;
  font-size: 15px;
  color: var(--color-ink-muted);
  padding: var(--space-2) var(--space-2);
  transition: color 0.15s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-ink);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  border-radius: var(--radius);
  border: 1px solid transparent;
  text-decoration: none;
  min-height: 44px;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #ffffff;
  border-color: var(--color-accent);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

.btn-secondary {
  background-color: var(--color-surface);
  color: var(--color-ink);
  border-color: var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-surface-soft);
}

.btn-danger {
  background-color: var(--color-danger);
  color: #ffffff;
  border-color: var(--color-danger);
}

.btn-danger:hover:not(:disabled) {
  background-color: var(--color-danger-hover);
  border-color: var(--color-danger-hover);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.main-content {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-10) var(--space-6);
  min-height: calc(100vh - 160px);
}

.hero-section {
  padding: var(--space-12) 0 var(--space-16);
  border-bottom: 1px solid var(--color-border);
}

.hero-content {
  max-width: 760px;
}

.hero-title {
  font-size: clamp(38px, 6vw, 56px);
  color: var(--color-ink);
  margin-bottom: var(--space-4);
  line-height: 1.05;
}

.hero-lead {
  font-size: 20px;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-8);
  max-width: 48ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  padding: var(--space-12) 0;
  border-bottom: 1px solid var(--color-border);
}

.feature-panel {
  background-color: var(--color-surface);
  padding: var(--space-8);
}

.feature-title {
  font-size: 22px;
  margin-bottom: var(--space-3);
  color: var(--color-ink);
}

.feature-text {
  font-size: 15px;
  color: var(--color-ink-muted);
}

.manifesto-section {
  padding: var(--space-12) 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-10);
  align-items: center;
}

.manifesto-quote {
  font-family: var(--font-display);
  font-size: 28px;
  line-height: 1.25;
  color: var(--color-ink);
}

.auth-card {
  background-color: var(--color-surface);
  padding: var(--space-8);
  max-width: 440px;
  margin: 0 auto;
  border: 1px solid var(--color-border);
}

.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: var(--space-2);
  color: var(--color-ink);
}

.form-input, .form-textarea {
  width: 100%;
  padding: var(--space-3);
  font-family: var(--font-body);
  font-size: 16px;
  color: var(--color-ink);
  background-color: var(--color-ground);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.form-input:focus, .form-textarea:focus {
  background-color: #ffffff;
  border-color: var(--color-accent);
}

.form-textarea {
  min-height: 220px;
  resize: vertical;
  line-height: 1.6;
}

.notice {
  padding: var(--space-3) var(--space-4);
  font-size: 14px;
  margin-bottom: var(--space-5);
}

.notice-success {
  background-color: var(--color-surface-soft);
  color: var(--color-accent);
  border: 1px solid var(--color-border);
}

.notice-error {
  background-color: #fdf2f2;
  color: var(--color-danger);
  border: 1px solid #f8c8c8;
}

.journal-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: var(--space-8);
  align-items: start;
}

.sidebar {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-5);
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.notes-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-height: 520px;
  overflow-y: auto;
}

.note-item-btn {
  width: 100%;
  text-align: left;
  padding: var(--space-3);
  background-color: var(--color-ground);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
}

.note-item-btn:hover {
  background-color: var(--color-surface-soft);
}

.note-item-btn.active {
  background-color: var(--color-surface-soft);
  border-color: var(--color-accent);
}

.note-item-title {
  font-weight: 600;
  font-size: 15px;
  color: var(--color-ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  display: block;
}

.note-item-meta {
  font-size: 12px;
  color: var(--color-ink-muted);
  margin-top: var(--space-1);
  display: block;
  font-variant-numeric: tabular-nums;
}

.workspace {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-8);
}

.workspace-actions {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.note-detail-title {
  font-size: 32px;
  margin-bottom: var(--space-3);
  color: var(--color-ink);
}

.note-detail-date {
  font-size: 13px;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-6);
  font-variant-numeric: tabular-nums;
  display: block;
}

.note-detail-body {
  font-size: 17px;
  line-height: 1.65;
  white-space: pre-wrap;
  color: var(--color-ink);
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background-color: var(--color-surface);
  padding: var(--space-8) var(--space-6);
  margin-top: var(--space-12);
}

.footer-container {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-name {
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--color-ink);
}

.footer-note {
  font-size: 13px;
  color: var(--color-ink-muted);
}

@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    align-items: flex-start;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .manifesto-section {
    grid-template-columns: 1fr;
  }
  .journal-layout {
    grid-template-columns: 1fr;
  }
  .footer-container {
    flex-direction: column;
    gap: var(--space-4);
    align-items: flex-start;
  }
}