/* Reset & Variables */
:root {
  /* Pastel Premium Theme */
  --bg-app: #f9f8f4; /* Off-white / Eggshell */
  --bg-subtle: #f2f0eb;
  --bg-panel: #ffffff;

  /* Compatibility neutrals (used across legacy selectors) */
  --slate-50: var(--bg-app);
  --slate-100: var(--bg-subtle);
  --slate-200: var(--border-subtle);
  --slate-300: var(--border-default);
  --slate-400: var(--text-tertiary);
  --slate-500: var(--text-secondary);
  --slate-700: var(--text-secondary);

  /* Pastel Accents */
  --primary-50: #f0f4f8;
  --primary-100: #d9e2ec;
  --primary-500: #93a8ac; /* Muted Pastel Blue/Green */
  --primary-600: #7a9196;
  --primary-700: #617479;

  /* High Contrast Text */
  --text-primary: #111111;
  --text-secondary: #333333;
  --text-tertiary: #666666;

  --border-subtle: #e6e2dd;
  --border-default: #d1cdc7;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 24px;
}

html[data-theme="dark"] {
  --bg-app: #0b0b0b;
  --bg-subtle: #111111;
  --bg-panel: #141414;
  --primary-50: #1e2a2d;
  --primary-100: #263436;
  --primary-500: #7fa1a7;
  --primary-600: #6b8b91;
  --primary-700: #587277;
  --text-primary: #f0f4f8;
  --text-secondary: #c9d0d6;
  --text-tertiary: #9aa3aa;
  --border-subtle: #262c30;
  --border-default: #2f363b;
}

html[data-theme="light"][data-warm="on"] {
  --bg-app: #fbf6ef;
  --bg-subtle: #f4eadc;
  --bg-panel: #fff9f1;
  --primary-50: #f7eee3;
  --primary-100: #eddcc8;
  --primary-500: #b89274;
  --primary-600: #a57f62;
  --primary-700: #8f6b50;
  --border-subtle: #eadfcd;
  --border-default: #d8cabb;
}

html[data-theme="dark"][data-warm="on"] {
  --bg-app: #2a2a2a;
  --bg-subtle: #2f2f2f;
  --bg-panel: #333333;
  --primary-50: #2a211b;
  --primary-100: #3a2c22;
  --primary-500: #b08a6c;
  --primary-600: #9b775b;
  --primary-700: #836149;
  --border-subtle: #2c241f;
  --border-default: #3a3029;
}

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

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  background-color: var(--bg-app);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* Layout Structure */
.app-layout {
  display: flex;
  flex-direction: column;
  height: 100%;
  width: 100%;
}

.workspace {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Top Navigation */
.top-nav {
  height: 56px;
  border-bottom: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: var(--bg-panel);
  z-index: 10;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.theme-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: var(--text-primary);
}

.logo-icon {
  color: var(--primary-600);
}

.brand-name {
  font-size: 16px;
  letter-spacing: -0.01em;
}

.user-menu {
  position: relative;
  display: flex;
  align-items: center;
}

.avatar-button {
  width: 36px;
  height: 36px;
  border-radius: 999px;
  border: 1px solid var(--border-default);
  background: var(--slate-100);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-primary);
  transition: background 0.2s ease, border-color 0.2s ease;
}

.avatar-button:hover {
  background: var(--slate-200);
}

.avatar-initials {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.theme-toggle {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  border: 1px solid var(--border-default);
  background: var(--bg-panel);
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.theme-toggle:hover {
  background: var(--slate-100);
  color: var(--text-primary);
}

.theme-toggle.is-active {
  border-color: var(--primary-500);
  color: var(--primary-700);
  background: var(--primary-50);
}

.theme-icon {
  width: 16px;
  height: 16px;
}

.theme-icon-moon {
  display: none;
}

html[data-theme="dark"] .theme-icon-sun {
  display: none;
}

html[data-theme="dark"] .theme-icon-moon {
  display: inline;
}

.user-menu-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 160px;
  background: var(--bg-panel);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 6px;
  display: none;
  flex-direction: column;
  gap: 4px;
  z-index: 20;
}

.menu-item {
  width: 100%;
  text-align: left;
  border: none;
  background: transparent;
  padding: 8px 10px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
}

.menu-item:hover {
  background: var(--slate-100);
}

.menu-item-danger {
  color: #8f3b32;
}

.menu-item-danger:hover {
  background: #fdecea;
}

/* Sidebar */
.sidebar {
  width: 260px;
  background: var(--bg-subtle);
  border-right: 1px solid var(--border-default);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-section {
  padding: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.section-title {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

.search-box {
  position: relative;
  margin-bottom: 8px;
}

.search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
}

.search-box input,
.filter-box input {
  width: 100%;
  padding: 8px 12px 8px 32px;
  font-size: 13px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background: var(--bg-app);
  transition: all 0.2s;
}

.filter-box input {
  padding-left: 12px;
}

.search-box input:focus,
.filter-box input:focus {
  outline: none;
  border-color: var(--primary-500);
  box-shadow: 0 0 0 2px var(--primary-100);
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-item {
  padding: 8px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary);
  transition: all 0.15s;
  border: 1px solid transparent;
}

.nav-item:hover {
  background: var(--slate-200);
  color: var(--text-primary);
}

.nav-item.active {
  background: #fff;
  border-color: var(--border-default);
  color: var(--primary-600);
  font-weight: 500;
  box-shadow: var(--shadow-sm);
}

.nav-item-title {
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-item-meta {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: 2px;
}

/* Main Content */
.main-content {
  flex: 1;
  background: var(--bg-app);
  overflow-y: auto;
  display: flex;
  justify-content: center;
}

.content-container {
  width: 100%;
  max-width: 800px;
  padding: 32px 24px;
}

.input-area {
  margin-bottom: 32px;
}

.url-input-wrapper {
  display: flex;
  gap: 8px;
  background: var(--bg-panel);
  padding: 8px;
  border: none;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: box-shadow 0.2s, transform 0.2s;
}

.url-input-wrapper:focus-within {
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
}

.main-input {
  flex: 1;
  border: none;
  padding: 10px 16px;
  font-size: 14px;
  outline: none;
  background: transparent;
}

/* Paper View */
.paper-view {
  animation: fadeIn 0.3s ease;
}

.paper-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-default);
}

.paper-meta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.export-menu {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.export-menu-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  display: flex;
  flex-direction: column;
  min-width: 160px;
  background: var(--bg-panel);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 4px;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.12);
  z-index: 20;
}

.export-menu-dropdown button {
  background: transparent;
  border: 0;
  text-align: left;
  width: 100%;
  padding: 6px 10px;
  font-size: 12px;
  color: var(--text-primary);
  cursor: pointer;
  border-radius: var(--radius-sm);
}

.export-menu-dropdown button:hover {
  background: var(--slate-100);
}

/* Source Type Selector */
.source-type-selector {
  display: flex;
  gap: 4px;
  margin-bottom: 8px;
}

.source-tab {
  padding: 6px 12px;
  border: 1px solid var(--border-default);
  background: var(--bg-panel);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

.source-tab:hover {
  background: var(--slate-100);
}

.source-tab.active {
  background: var(--primary-500);
  color: white;
  border-color: var(--primary-500);
}

/* Style Select */
.style-select {
  padding: 8px 12px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  background: var(--bg-panel);
  font-size: 13px;
  color: var(--text-primary);
  cursor: pointer;
  min-width: 120px;
}

/* Summary Actions */
.summary-actions {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.summary-actions .btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Q&A Suggestions */
.qa-suggestions {
  padding: 8px 12px;
  background: var(--slate-50);
  border-bottom: 1px solid var(--border-subtle);
}

.suggestions-label {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-bottom: 8px;
}

.suggestions-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.suggestion-chip {
  padding: 4px 10px;
  background: var(--primary-50);
  border: 1px solid var(--primary-100);
  border-radius: var(--radius-sm);
  font-size: 11px;
  color: var(--primary-700);
  cursor: pointer;
  transition: all 0.2s;
}

.suggestion-chip:hover {
  background: var(--primary-100);
}

/* Paper Actions */
.paper-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
}

.action-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Meta Tag Secondary */
.meta-tag-secondary {
  background: var(--primary-100);
  color: var(--primary-700);
}

.meta-tag {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--slate-100);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.meta-link {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--primary-600);
  text-decoration: none;
  font-weight: 500;
}

button.meta-link {
  background: transparent;
  border: 0;
  padding: 0;
  cursor: pointer;
  font: inherit;
}

button.meta-link:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.meta-link:hover {
  text-decoration: underline;
}

.paper-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.paper-authors {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.paper-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.input-with-icon {
  position: relative;
  width: 180px;
}

.input-with-icon svg {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
}

.input-with-icon input {
  width: 100%;
  padding: 6px 12px 6px 30px;
  font-size: 13px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  transition: all 0.2s;
}

.input-with-icon input:focus {
  outline: none;
  border-color: var(--primary-500);
}

.tags-input-container {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.tag-chip {
  font-size: 11px;
  background: var(--primary-50);
  color: var(--primary-700);
  padding: 2px 8px;
  border-radius: 99px;
  display: flex;
  align-items: center;
  gap: 4px;
  border: 1px solid var(--primary-100);
}

.tag-remove {
  cursor: pointer;
  opacity: 0.6;
}

.tag-remove:hover {
  opacity: 1;
}

#newTagInput {
  width: 80px;
  padding: 4px 8px;
  font-size: 12px;
  border: 1px dashed var(--border-default);
  border-radius: var(--radius-md);
  background: transparent;
}

#newTagInput:focus {
  border-style: solid;
  border-color: var(--primary-500);
  outline: none;
}

/* Section Cards */
.section-card {
  background: #fff;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.section-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.content-block {
  font-size: 15px;
  line-height: 1.7;
  color: var(--slate-700);
}

.content-block p {
  margin-bottom: 12px;
}

.content-block ul {
  padding-left: 20px;
  margin-bottom: 12px;
}

.content-block li {
  margin-bottom: 6px;
}

/* Right Panel */
.right-panel {
  width: 320px;
  background: var(--bg-panel);
  border-left: 1px solid var(--border-default);
  display: none;
  flex-direction: column;
  flex-shrink: 0;
}

.panel-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-default);
}

.panel-tab {
  flex: 1;
  padding: 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
}

.panel-tab:hover {
  color: var(--text-primary);
  background: var(--slate-50);
}

.panel-tab.active {
  color: var(--primary-600);
  border-bottom-color: var(--primary-600);
}

.panel-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.notes-wrapper {
  display: flex;
  flex-direction: column;
  height: 100%;
}

#userNotes {
  flex: 1;
  width: 100%;
  padding: 16px;
  border: none;
  resize: none;
  font-family: "Inter", sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
  outline: none;
}

.notes-footer {
  padding: 8px 16px;
  border-top: 1px solid var(--border-default);
  font-size: 11px;
  color: var(--text-tertiary);
  text-align: right;
}

/* Q&A Styles */
.qa-container {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.qa-history {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.qa-welcome {
  text-align: center;
  color: var(--text-tertiary);
  margin-top: 40px;
  font-size: 13px;
}

.qa-message {
  font-size: 13px;
  line-height: 1.5;
  max-width: 90%;
  white-space: pre-wrap;
}

.qa-message.user {
  align-self: flex-end;
  background: var(--primary-50);
  color: var(--primary-700);
  padding: 8px 12px;
  border-radius: 12px 12px 0 12px;
}

.qa-message.ai {
  align-self: flex-start;
  background: var(--slate-100);
  color: var(--text-primary);
  padding: 8px 12px;
  border-radius: 12px 12px 12px 0;
}

.qa-input-area {
  padding: 12px;
  border-top: 1px solid var(--border-default);
  display: flex;
  gap: 8px;
  align-items: flex-end;
}

#qaInput {
  flex: 1;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 8px 12px;
  font-size: 13px;
  resize: none;
  max-height: 100px;
  outline: none;
  font-family: inherit;
}

#qaInput:focus {
  border-color: var(--primary-500);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid transparent;
  gap: 6px;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

.btn-primary {
  background: var(--primary-600);
  color: white;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover {
  background: var(--primary-700);
}

.btn-outline {
  background: white;
  border-color: var(--border-default);
  color: var(--text-primary);
}

.btn-outline:hover {
  background: var(--slate-50);
  border-color: var(--slate-300);
}

.btn-disabled,
.btn-disabled:hover {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  background: var(--slate-100);
  color: var(--text-primary);
}

.btn-icon {
  padding: 6px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
}

.btn-icon:hover {
  background: var(--slate-100);
  color: var(--text-primary);
}

.btn-icon-primary {
  padding: 8px;
  border-radius: var(--radius-md);
  background: var(--primary-600);
  color: white;
  border: none;
  cursor: pointer;
}

.btn-icon-primary:hover {
  background: var(--primary-700);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
}

.empty-icon {
  color: var(--slate-300);
  margin-bottom: 16px;
}

.empty-state h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

/* Auth Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(2px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: fadeIn 0.2s ease;
}

.modal-content {
  background: white;
  width: 100%;
  max-width: 400px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 24px;
  animation: slideUp 0.2s ease;
}

.settings-modal {
  max-width: 360px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.modal-header h3 {
  font-size: 18px;
  font-weight: 600;
}

.settings-body {
  color: var(--text-secondary);
  font-size: 13px;
}

.auth-tabs {
  display: flex;
  background: var(--slate-100);
  padding: 4px;
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
}

.tab-btn {
  flex: 1;
  padding: 8px;
  font-size: 13px;
  font-weight: 500;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
}

.tab-btn.active {
  background: white;
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

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

.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  font-size: 14px;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary-500);
  box-shadow: 0 0 0 2px var(--primary-100);
}

.btn-block {
  width: 100%;
}

.divider {
  display: flex;
  align-items: center;
  text-align: center;
  margin: 20px 0;
  color: var(--text-tertiary);
  font-size: 12px;
}

.divider::before,
.divider::after {
  content: "";
  flex: 1;
  border-bottom: 1px solid var(--border-default);
}

.divider span {
  padding: 0 10px;
}

/* Utilities */
.alert {
  padding: 12px;
  border-radius: var(--radius-md);
  font-size: 13px;
  margin-bottom: 16px;
}

.alert-error {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--slate-300);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--slate-400);
}