:root {
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --background: #0f172a;
  --surface: #1e293b;
  --surface-hover: #334155;
  --text: #f8fafc;
  --text-muted: #94a3b8;
  --error: #ef4444;
  --success: #22c55e;
  --border: #334155;
  --radius: 12px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--background);
  color: var(--text);
  min-height: 100vh;
}

/* Login/Register Container */
.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: linear-gradient(135deg, var(--background) 0%, #1a1a2e 100%);
}

.login-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 2.5rem;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.login-card h1 {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  background: linear-gradient(135deg, var(--primary) 0%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.login-card .subtitle {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

/* Form Styles */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.form-group input {
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1rem;
  transition: all 0.2s ease;
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.form-group input::placeholder {
  color: var(--text-muted);
}

button[type="submit"] {
  width: 100%;
  padding: 0.875rem;
  background: var(--primary);
  border: none;
  border-radius: 8px;
  color: white;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-top: 0.5rem;
}

button[type="submit"]:hover:not(:disabled) {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

button[type="submit"]:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.error-message {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--error);
  color: var(--error);
  padding: 0.75rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-size: 0.875rem;
}

.register-link {
  text-align: center;
  margin-top: 1.5rem;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.register-link a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

.register-link a:hover {
  text-decoration: underline;
}

/* Dashboard Layout */
.dashboard-layout {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

.sidebar {
  width: 280px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.sidebar-nav {
  flex: 1;
  padding: 1rem;
  overflow-y: auto;
}

.nav-item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: transparent;
  border: none;
  border-radius: 8px;
  color: var(--text-muted);
  font-size: 0.9375rem;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-bottom: 0.25rem;
  text-align: left;
}

.nav-item:hover {
  background: var(--surface-hover);
  color: var(--text);
}

.nav-item.active {
  background: rgba(99, 102, 241, 0.1);
  color: var(--primary);
  font-weight: 500;
}

.nav-item .icon {
  font-size: 1.125rem;
}

.nav-item .label {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-item .badge {
  background: var(--primary);
  color: white;
  font-size: 0.75rem;
  padding: 0.125rem 0.5rem;
  border-radius: 10px;
  font-weight: 600;
}

.sidebar-section {
  margin-top: 2rem;
}

.sidebar-section h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  padding: 0 1rem;
  margin-bottom: 0.75rem;
}

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

.add-feed-btn {
  width: 100%;
  padding: 0.75rem;
  background: transparent;
  border: 1px dashed var(--border);
  border-radius: 8px;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
}

.add-feed-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.dashboard-header {
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.mark-all-read-btn {
  background: transparent;
  border: 1px solid var(--primary);
  color: var(--primary);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.mark-all-read-btn:hover:not(:disabled) {
  background: var(--primary);
  color: white;
}

.mark-all-read-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.articles-main {
  flex: 1;
  overflow-y: auto;
  padding: 2rem;
}

.articles-grid {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Article Card */
.article-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.article-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

.article-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.feed-title {
  font-weight: 600;
  color: var(--primary);
}

.article-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.article-excerpt {
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.article-footer {
  display: flex;
  gap: 1rem;
}

.action-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.375rem 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 1rem;
}

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

.action-btn.active {
  color: #fbbf24;
  border-color: #fbbf24;
}

/* Reader View Overlay */
.reader-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.85);
  display: flex;
  justify-content: flex-end;
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.reader-container {
  width: 100%;
  max-width: 800px;
  background: var(--background);
  height: 100%;
  display: flex;
  flex-direction: column;
  animation: slideIn 0.3s ease-out;
  box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
  }

  to {
    transform: translateX(0);
  }
}

.reader-header {
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--surface);
}

.close-btn {
  background: transparent;
  border: none;
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.reader-actions {
  display: flex;
  gap: 1rem;
}

.reader-content {
  flex: 1;
  overflow-y: auto;
  padding: 3rem 4rem;
  line-height: 1.6;
}

.reader-content .meta {
  display: flex;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.reader-content .title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.reader-content .author {
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 2rem;
}

.content-body {
  font-size: 1.125rem;
  color: #e2e8f0;
}

.content-body p {
  margin-bottom: 1.5rem;
}

.content-body img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 1.5rem 0;
}

.content-body a {
  color: var(--primary);
  text-decoration: underline;
}

.content-body h1,
.content-body h2,
.content-body h3 {
  margin-top: 2rem;
  margin-bottom: 1rem;
}

/* Loading/Empty States */
.loading-state {
  display: flex;
  justify-content: center;
  padding: 4rem;
}

/* Mobile Adjustments */
@media (max-width: 768px) {
  .sidebar {
    display: none;
  }

  .reader-content {
    padding: 2rem 1.5rem;
  }

  .reader-content .title {
    font-size: 1.75rem;
  }
}

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

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Mobile First */
@media (max-width: 480px) {
  .login-card {
    padding: 1.5rem;
  }

  .login-card h1 {
    font-size: 1.5rem;
  }
}