:root {
  --bg: #0b1120;
  --bg-card: #1a2332;
  --bg-card-hover: #1e293b;
  --bg-input: #1a2332;
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --border: #1e293b;
  --error: #ef4444;
  --success: #22c55e;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

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

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

/* ======== Login Screen ======== */
.fullscreen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  z-index: 100;
}

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 48px 40px;
  width: 380px;
  max-width: 90vw;
  text-align: center;
  box-shadow: var(--shadow);
}

.login-icon {
  font-size: 48px;
  margin-bottom: 16px;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.login-card h1 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

.login-subtitle {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 28px;
}

#login-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#login-form input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

#login-form input:focus {
  border-color: var(--accent);
}

#login-form button {
  width: 100%;
  padding: 12px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

#login-form button:hover {
  background: var(--accent-hover);
}

#login-form button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.error-msg {
  color: var(--error);
  font-size: 13px;
  margin-top: 12px;
  min-height: 20px;
}

/* ======== Main App ======== */
#main-app {
  padding: 24px;
  max-width: 1400px;
  margin: 0 auto;
}

.hidden { display: none !important; }

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 16px;
}

.header-left {
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.app-title {
  font-size: 22px;
  font-weight: 700;
}

.clock {
  color: var(--text-secondary);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.search-input {
  padding: 8px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 14px;
  width: 240px;
  outline: none;
  transition: border-color 0.2s;
}

.search-input:focus {
  border-color: var(--accent);
}

.search-input::placeholder {
  color: var(--text-secondary);
}

.btn-add {
  padding: 8px 16px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-add:hover {
  background: var(--accent-hover);
}

.btn-logout {
  padding: 8px 16px;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-logout:hover {
  color: var(--error);
  border-color: var(--error);
}

/* ======== Loading ======== */
.loading {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--text-secondary);
  padding: 60px 20px;
  font-size: 14px;
}

/* ======== Bookmarks Grid ======== */
.bookmarks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: border-color 0.2s;
}

.category-card:hover {
  border-color: var(--accent);
}

.category-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.category-icon {
  font-size: 20px;
}

.category-name {
  font-size: 15px;
  font-weight: 600;
}

.category-count {
  color: var(--text-secondary);
  font-size: 11px;
  background: var(--bg);
  padding: 2px 8px;
  border-radius: 10px;
  margin-left: auto;
}

.link-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.link-item {
  position: relative;
}

.link-item a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  transition: background 0.15s;
}

.link-item a:hover {
  background: var(--bg-card-hover);
}

.link-item:hover .link-actions {
  opacity: 1;
}

.link-favicon {
  width: 18px;
  height: 18px;
  border-radius: 3px;
  flex-shrink: 0;
}

.link-name {
  flex: 1;
}

.link-actions {
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.15s;
  flex-shrink: 0;
}

.link-actions button {
  padding: 4px 8px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s;
}

.link-actions .btn-edit:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.link-actions .btn-delete:hover {
  color: var(--error);
  border-color: var(--error);
}

.no-results {
  text-align: center;
  color: var(--text-secondary);
  padding: 60px 20px;
  grid-column: 1 / -1;
  font-size: 14px;
}

/* ======== Modal ======== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  backdrop-filter: blur(4px);
}

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  width: 420px;
  max-width: 90vw;
  box-shadow: var(--shadow);
}

.modal h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  color: var(--text-secondary);
  font-size: 13px;
  margin-bottom: 6px;
}

.form-group input {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus {
  border-color: var(--accent);
}

.category-input-row {
  display: flex;
  gap: 8px;
}

.category-input-row input {
  flex: 1;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 20px;
}

.btn-cancel {
  padding: 10px 20px;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-cancel:hover {
  border-color: var(--text-secondary);
}

.btn-save {
  padding: 10px 20px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-save:hover {
  background: var(--accent-hover);
}

/* ======== Toast ======== */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 24px;
  color: var(--text);
  font-size: 14px;
  box-shadow: var(--shadow);
  z-index: 300;
  transition: opacity 0.3s;
}

.toast.success { border-color: var(--success); }
.toast.error { border-color: var(--error); }

/* ======== Transitions ======== */
.fade-out {
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.fade-in {
  animation: fadeIn 0.4s ease;
}

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

/* ======== Responsive ======== */
@media (max-width: 768px) {
  .app-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-right {
    width: 100%;
  }

  .search-input {
    width: 100%;
    flex: 1;
  }

  .bookmarks-grid {
    grid-template-columns: 1fr;
  }

  .login-card {
    padding: 36px 28px;
  }

  .link-actions {
    opacity: 1;
  }
}