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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: #0a0a0a;
  color: #e0e0e0;
  line-height: 1.5;
  overflow: hidden;
  height: 100vh;
}

#app {
  height: 100vh;
}

/* Layout */
.layout {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: 1fr auto;
  border: 1px solid #222;
  margin: 12px;
  height: calc(100vh - 24px);
}

/* Left panel */
.panel-left {
  display: flex;
  flex-direction: column;
  padding: 2.5rem 3rem;
  overflow: hidden;
}

.section-subtitle {
  font-size: 0.8rem;
  font-weight: 300;
  color: #666;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: clamp(4rem, 10vw, 8rem);
  font-weight: 900;
  color: #fff;
  line-height: 0.95;
  letter-spacing: -0.03em;
  margin-bottom: 2rem;
  transition: opacity 0.3s;
}

.section-divider {
  width: 100%;
  height: 1px;
  background: #222;
  margin-bottom: 1.5rem;
}

.section-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.75rem;
}

.section-year {
  font-size: 0.8rem;
  font-weight: 300;
  color: #888;
}

.section-count {
  font-size: 0.8rem;
  font-weight: 300;
  color: #888;
}

.section-description {
  font-size: 0.85rem;
  color: #777;
  line-height: 1.6;
  max-width: 480px;
  margin-bottom: 1.5rem;
}

/* Content area */
.content-area {
  flex: 1;
  overflow-y: auto;
  padding-right: 1rem;
  scrollbar-width: thin;
  scrollbar-color: #222 transparent;
}

.content-area::-webkit-scrollbar {
  width: 4px;
}

.content-area::-webkit-scrollbar-thumb {
  background: #222;
  border-radius: 2px;
}

/* Navigation tabs (right panel) */
.panel-right {
  display: flex;
  border-left: 1px solid #222;
}

.nav-tab {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 2.5rem 1.25rem 2rem;
  background: none;
  border: none;
  border-left: 1px solid #222;
  color: #555;
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  font-weight: 400;
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
  min-width: 70px;
  letter-spacing: 0.02em;
}

.nav-tab:first-child {
  border-left: none;
}

.nav-tab:hover {
  color: #aaa;
  background: #111;
}

.nav-tab.active {
  color: #fff;
  font-weight: 700;
  background: #0f0f0f;
}

/* Bookmark form */
.bookmark-form {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.bookmark-form input {
  flex: 1;
  padding: 0.5rem 0;
  border: none;
  border-bottom: 1px solid #222;
  background: transparent;
  color: #e0e0e0;
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  outline: none;
  transition: border-color 0.2s;
}

.bookmark-form input:focus {
  border-color: #555;
}

.bookmark-form input::placeholder {
  color: #444;
}

.btn-add {
  padding: 0.5rem 1rem;
  background: #fff;
  color: #0a0a0a;
  border: none;
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: opacity 0.2s;
}

.btn-add:hover {
  opacity: 0.85;
}

/* Bookmark list */
.bookmark-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px solid #151515;
}

.bookmark-info {
  min-width: 0;
  flex: 1;
}

.bookmark-title {
  color: #fff;
  text-decoration: none;
  font-size: 0.825rem;
  font-weight: 400;
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: color 0.15s;
}

.bookmark-title:hover {
  color: #888;
}

.bookmark-meta {
  font-size: 0.65rem;
  color: #444;
  margin-top: 0.15rem;
  font-weight: 300;
}

.bookmark-category {
  color: #555;
  margin-right: 0.5rem;
  text-transform: lowercase;
}

.btn-delete {
  background: none;
  border: none;
  color: #333;
  padding: 0.25rem 0.5rem;
  font-size: 0.65rem;
  cursor: pointer;
  font-family: 'Inter', sans-serif;
  letter-spacing: 0.05em;
  transition: color 0.15s;
}

.btn-delete:hover {
  color: #ef4444;
}

/* Actions bar */
.actions-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.btn-action {
  padding: 0.35rem 0.75rem;
  background: transparent;
  color: #555;
  border: 1px solid #222;
  font-family: 'Inter', sans-serif;
  font-size: 0.7rem;
  font-weight: 400;
  cursor: pointer;
  letter-spacing: 0.03em;
  transition: all 0.2s;
}

.btn-action:hover {
  color: #fff;
  border-color: #444;
}

.btn-action:disabled {
  opacity: 0.4;
  cursor: default;
}

.status {
  font-size: 0.7rem;
  color: #555;
  font-weight: 300;
}

.empty {
  color: #333;
  font-size: 0.8rem;
  padding: 3rem 0;
  text-align: center;
  font-weight: 300;
  letter-spacing: 0.05em;
}

/* Login */
.login-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  gap: 1rem;
}

.login-title {
  font-size: clamp(5rem, 15vw, 12rem);
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.04em;
  line-height: 0.9;
}

.login-subtitle {
  color: #444;
  font-size: 0.8rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  margin-bottom: 1.5rem;
}

.btn-google {
  padding: 0.625rem 2rem;
  background: #fff;
  color: #0a0a0a;
  border: none;
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.03em;
  transition: opacity 0.2s;
}

.btn-google:hover {
  opacity: 0.85;
}

/* Header */
.header-bar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.user-email {
  font-size: 0.65rem;
  color: #444;
  font-weight: 300;
}

.btn-logout {
  background: none;
  border: none;
  color: #444;
  font-family: 'Inter', sans-serif;
  font-size: 0.65rem;
  cursor: pointer;
  letter-spacing: 0.05em;
  transition: color 0.15s;
  padding: 0;
}

.btn-logout:hover {
  color: #fff;
}

/* Footer */
.footer {
  grid-column: 1 / -1;
  border-top: 1px solid #222;
  padding: 0.5rem 1.5rem;
  display: flex;
  justify-content: flex-end;
}

.footer-version {
  font-size: 0.6rem;
  color: #333;
  font-weight: 300;
  font-family: 'Inter', monospace;
  letter-spacing: 0.05em;
}

/* Loading */
.loading-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  color: #333;
  font-size: 0.8rem;
  font-weight: 300;
  letter-spacing: 0.1em;
}