:root, .theme-classic {
  --bg-color: #f8f6f0;
  --panel-bg: #ffffff;
  --text-main: #222222;
  --text-muted: #555555;
  --accent: #1a1a1a;
  --border-color: #e5e0d8;
  --border-dark: #222222;

  --font-serif: 'Playfair Display', Georgia, serif;
  --font-body: 'Lora', 'Times New Roman', serif;
  
  --card-radius: 4px;
  --card-blur: none;
  --btn-bg: var(--text-main);
  --btn-border: 1px solid var(--text-main);
  --btn-hover-bg: transparent;
  --btn-hover-text: var(--text-main);
  --btn-text: var(--bg-color);
  
  --img-filter: sepia(20%) grayscale(20%);
  --bookmark-filter: sepia(10%);
}

.theme-modern {
  --bg-color: #0f172a;
  --panel-bg: rgba(30, 41, 59, 0.7);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent: #3b82f6;
  --border-color: rgba(255, 255, 255, 0.1);
  --border-dark: rgba(255, 255, 255, 0.2);

  --font-serif: 'Inter', -apple-system, sans-serif;
  --font-body: 'Inter', -apple-system, sans-serif;

  --card-radius: 12px;
  --card-blur: blur(12px);
  --btn-bg: var(--accent);
  --btn-border: 1px solid var(--accent);
  --btn-hover-bg: #2563eb;
  --btn-hover-text: #ffffff;
  --btn-text: #ffffff;
  
  --img-filter: none;
  --bookmark-filter: none;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: var(--font-body);
  line-height: 1.6;
  height: 100vh;
  overflow: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

a {
  text-decoration: none;
  color: inherit;
}

.app-container {
  display: flex;
  height: 100vh;
}

/* --- Sidebar --- */
.sidebar {
  width: 250px;
  background-color: var(--bg-color);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: 2rem 1rem;
}

.logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--border-dark);
  text-align: center;
}

.nav-links {
  list-style: none;
  flex: 1;
}

.nav-links li {
  padding: 0.8rem 1rem;
  margin-bottom: 0.5rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-weight: 600;
  border: 1px solid transparent;
}

.nav-links li:hover {
  background-color: rgba(0,0,0,0.03);
}

.nav-links li.active {
  background-color: var(--panel-bg);
  border-color: var(--border-dark);
}

.sidebar-footer {
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-top: 1rem;
  font-size: 0.9rem;
  font-family: var(--font-serif);
  font-style: italic;
}

.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--border-dark);
  border: 1px solid var(--border-color);
}

/* --- Main Content --- */
.content-area {
  flex: 1;
  padding: 3rem 4rem;
  overflow-y: auto;
  background-color: var(--bg-color);
}

.view {
  display: none;
  animation: fadeIn 0.3s ease;
}

.view.active {
  display: block;
}

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

header h1 {
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -1px;
}

.date-string {
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-dark);
  padding-bottom: 1rem;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  background-color: var(--btn-bg);
  color: var(--btn-text);
  padding: 0.6rem 1.2rem;
  border: var(--btn-border);
  border-radius: 2px;
  cursor: pointer;
  font-family: var(--font-body);
  font-weight: 600;
  transition: all 0.2s;
}

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

.btn-outline {
  background-color: transparent;
  color: var(--text-main);
  border: 1px solid var(--text-main);
  padding: 0.6rem 1.2rem;
  border-radius: 2px;
  cursor: pointer;
  font-family: var(--font-body);
  width: 100%;
  text-align: center;
  transition: all 0.2s;
}
.btn-outline:hover {
  background-color: var(--text-main);
  color: var(--bg-color);
}

/* --- Cards (Classic Style) --- */
.glass-card {
  position: relative;
  background: var(--panel-bg);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  border-radius: var(--card-radius);
  backdrop-filter: var(--card-blur);
  box-shadow: 0 4px 12px rgba(0,0,0,0.03);
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
}
.glass-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
  border-color: var(--border-dark);
}

/* --- Dashboard News List --- */
.news-feed-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.news-card {
  display: flex;
  padding: 0;
  overflow: hidden;
  height: 160px;
}

.news-card .thumbnail {
  width: 200px;
  height: 100%;
  background-size: cover;
  background-position: center;
  border-right: 1px solid var(--border-color);
  filter: var(--img-filter);
}

.news-content {
  flex: 1;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}

.news-content h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.news-content p {
  color: var(--text-muted);
  font-size: 0.95rem;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.news-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: #888;
  font-style: italic;
  margin-top: 0.5rem;
  border-top: 1px dotted var(--border-color);
  padding-top: 0.5rem;
}

/* --- Bookmarks Grid --- */
.bookmarks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
}

.bookmark-card .thumbnail {
  height: 120px;
  border-radius: 2px;
  margin-bottom: 1rem;
  filter: var(--bookmark-filter);
}

.bookmark-card h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  margin-bottom: 0.3rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.bookmark-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* --- Scrapbook Masonry --- */
.masonry-grid {
  display: column;
  column-count: 3;
  column-gap: 1.5rem;
}

.scrap-item {
  break-inside: avoid;
  margin-bottom: 1.5rem;
  border-top: 3px solid var(--border-dark);
}

.scrap-text {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-style: italic;
  margin-bottom: 1rem;
  line-height: 1.5;
}

.scrap-source {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* --- Modals --- */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.4);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 100;
  backdrop-filter: blur(2px);
}

.modal-overlay.active {
  display: flex;
}

.modal-content {
  background: var(--bg-color);
  width: 90%;
  max-width: 500px;
  border: 1px solid var(--border-dark);
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.modal-content h2 {
  font-family: var(--font-serif);
  border-bottom: 2px solid var(--border-dark);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

.close-modal {
  position: absolute;
  top: 15px;
  right: 20px;
  background: transparent;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-main);
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  margin-bottom: 0.3rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.8rem;
  background: #ffffff;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-family: var(--font-body);
  border-radius: 2px;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--border-dark);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--text-main);
  color: var(--bg-color);
  padding: 1rem 2rem;
  border-radius: 4px;
  transition: transform 0.3s;
  z-index: 1000;
  font-family: var(--font-body);
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
  .app-container { flex-direction: column; }
  .sidebar { width: 100%; border-right: none; border-bottom: 1px solid var(--border-color); padding: 1rem; flex-direction: row; align-items: center; overflow-x: auto; }
  .logo { border-bottom: none; border-right: 2px solid var(--border-dark); padding-bottom: 0; padding-right: 1rem; margin-bottom: 0; margin-right: 1rem; }
  .nav-links { display: flex; gap: 0.5rem; margin-bottom: 0; }
  .nav-links li { margin-bottom: 0; white-space: nowrap; }
  .sidebar-footer { display: none; }
  .content-area { padding: 1.5rem; }
  .news-card { flex-direction: column; height: auto; }
  .news-card .thumbnail { width: 100%; height: 150px; border-right: none; border-bottom: 1px solid var(--border-color); }
  .masonry-grid { column-count: 1; }
  .bookmarks-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .content-area { padding: 1rem; }
  .content-area header h1 { font-size: 1.4rem; }
  .content-area header p { font-size: 0.85rem; }
  .bookmarks-grid { grid-template-columns: 1fr; }
  .news-card .thumbnail { height: 120px; }
  .news-card .news-content h3 { font-size: 0.95rem; }
  .news-card .news-content p { font-size: 0.8rem; }
  .glass-card { padding: 0.8rem; }
  .modal-content { width: 95%; margin: 1rem; padding: 1.2rem; }
  .btn, .btn-outline { font-size: 0.85rem; padding: 0.5rem 1rem; }
}