:root {
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-muted: #f1f5f9;
  --bg-accent: #eff6ff;
  
  --border-light: #e2e8f0;
  --border-hover: #cbd5e1;
  --border-focus: #3b82f6;

  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-dim: #94a3b8;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #dbeafe;
  --primary-text: #ffffff;

  --success: #10b981;
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  --success-text: #065f46;

  --danger: #ef4444;
  --danger-hover: #dc2626;
  --danger-bg: #fef2f2;
  --danger-border: #fecaca;
  --danger-text: #991b1b;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);

  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ----------------- Layout & Nav ----------------- */

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

.top-navbar {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 40;
}

.nav-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-main);
  text-decoration: none;
}

.brand svg {
  color: var(--primary);
}

.domain-pill {
  font-size: 0.7rem;
  background: var(--bg-muted);
  color: var(--text-muted);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  border: 1px solid var(--border-light);
}

.nav-tabs {
  display: flex;
  gap: 0.35rem;
  background-color: var(--bg-muted);
  padding: 0.25rem;
  border-radius: var(--radius-md);
}

.nav-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.85rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.nav-tab-btn svg {
  width: 16px;
  height: 16px;
}

.nav-tab-btn:hover {
  color: var(--text-main);
}

.nav-tab-btn.active {
  background-color: var(--bg-card);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.nav-user {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.user-badge {
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--bg-muted);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
}

.main-content {
  flex: 1;
  max-width: 1000px;
  width: 100%;
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
}

/* ----------------- Active Note Sub-Bar ----------------- */

.active-note-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 0.6rem 0.85rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-sm);
  gap: 0.75rem;
  flex-wrap: wrap;
}

.active-note-info {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-width: 0;
}

.active-note-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}

.active-note-title-display {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 320px;
}

.active-note-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

/* ----------------- Buttons ----------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.5rem 0.9rem;
  font-size: 0.875rem;
  font-weight: 600;
  font-family: inherit;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
}

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

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

.btn-secondary {
  background-color: var(--bg-card);
  color: var(--text-main);
  border-color: var(--border-light);
}

.btn-secondary:hover {
  background-color: var(--bg-muted);
  border-color: var(--border-hover);
}

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

.btn-danger:hover {
  background-color: var(--danger);
  color: #fff;
  border-color: var(--danger);
}

.btn-sm {
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
}

.btn-block {
  width: 100%;
}

.btn-icon-only {
  padding: 0.5rem;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ----------------- Page Views ----------------- */

.page-view {
  display: none;
}

.page-view.active {
  display: block;
  animation: fadeIn 0.15s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0.8; transform: translateY(2px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ----------------- Page 1: Notes Editor ----------------- */

.editor-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.editor-header {
  padding: 1.25rem 1.5rem 0.75rem;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.note-title-input {
  width: 100%;
  font-size: 1.45rem;
  font-weight: 700;
  border: none;
  outline: none;
  color: var(--text-main);
  background: transparent;
  font-family: inherit;
}

.note-title-input::placeholder {
  color: var(--text-dim);
}

.editor-action-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.editor-stats {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  font-weight: 500;
}

.status-badge.saved {
  color: var(--success-text);
}

.status-badge.unsaved {
  color: #d97706;
}

.editor-body {
  padding: 1.25rem 1.5rem 1.5rem;
  display: flex;
  flex-direction: column;
}

.note-textarea {
  width: 100%;
  min-height: 480px;
  font-size: 1.05rem;
  line-height: 1.7;
  font-family: inherit;
  color: var(--text-main);
  background: transparent;
  border: none;
  outline: none;
  resize: vertical;
}

.note-textarea::placeholder {
  color: var(--text-dim);
}

/* ----------------- Page 2: Attachments ----------------- */

.attachments-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.section-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-sm);
}

.section-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.1rem;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

.section-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.dropzone-box {
  border: 2px dashed var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.5rem 1rem;
  text-align: center;
  background-color: var(--bg-muted);
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.dropzone-box:hover,
.dropzone-box.dragover {
  border-color: var(--primary);
  background-color: var(--primary-light);
}

.dropzone-icon {
  margin-bottom: 0.5rem;
  color: var(--primary);
}

.dropzone-text {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-main);
}

.dropzone-subtext {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.file-input-hidden {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

/* Photos Grid */
.photos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
  margin-top: 1.25rem;
}

.photo-card {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.photo-thumb-wrap {
  width: 100%;
  height: 140px;
  background-color: var(--bg-muted);
  cursor: pointer;
  overflow: hidden;
  position: relative;
}

.photo-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.2s ease;
}

.photo-thumb:hover {
  transform: scale(1.03);
}

.photo-meta {
  padding: 0.65rem 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  border-top: 1px solid var(--border-light);
}

.photo-name {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.photo-size {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* Files List */
.files-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-top: 1.25rem;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  gap: 0.75rem;
  transition: border-color 0.15s ease;
}

.file-item:hover {
  border-color: var(--border-hover);
}

.file-item-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}

.file-icon-box {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  flex-shrink: 0;
}

.file-info {
  min-width: 0;
}

.file-name {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-size-date {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.file-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-shrink: 0;
}

/* External Links Form & List */
.link-form {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 0.6rem;
  margin-bottom: 1.25rem;
}

.links-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.link-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  gap: 0.75rem;
}

.link-item-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}

.link-url-text {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 350px;
}

/* ----------------- Page 3: All Notes Archive ----------------- */

.all-notes-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.search-box-wrap {
  position: relative;
  flex: 1;
  max-width: 380px;
}

.search-box-wrap svg {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
}

.search-input {
  width: 100%;
  padding: 0.55rem 0.85rem 0.55rem 2.4rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  font-size: 0.875rem;
  outline: none;
  font-family: inherit;
}

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

.notes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 1.25rem;
}

.note-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all 0.15s ease;
  cursor: pointer;
}

.note-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.note-card.active-selected {
  border-color: var(--primary);
  background-color: var(--bg-card);
  outline: 2px solid var(--primary-light);
}

.note-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.4rem;
  line-height: 1.35;
}

.note-card-snippet {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 1rem;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.note-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-light);
  font-size: 0.75rem;
  color: var(--text-dim);
  gap: 0.5rem;
}

.note-badges {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  background: var(--bg-muted);
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.7rem;
}

/* ----------------- Empty States ----------------- */

.empty-state {
  text-align: center;
  padding: 3rem 1.5rem;
  color: var(--text-muted);
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px dashed var(--border-light);
}

.empty-state svg {
  margin-bottom: 0.75rem;
  color: var(--text-dim);
}

.empty-state h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.empty-state p {
  font-size: 0.85rem;
  max-width: 320px;
  margin: 0 auto;
}

/* ----------------- Form Controls ----------------- */

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

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--text-main);
}

.form-control {
  width: 100%;
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  font-size: 0.875rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s ease;
}

.form-control:focus {
  border-color: var(--border-focus);
}

/* ----------------- Login Screen ----------------- */

.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  min-height: 100vh;
}

.login-wrapper {
  width: 100%;
  max-width: 420px;
}

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 2.5rem 2rem;
}

.login-header {
  text-align: center;
  margin-bottom: 1.75rem;
}

.login-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.75rem;
}

.login-header h1 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
}

.login-header p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.password-input-wrapper {
  position: relative;
}

.password-input-wrapper input {
  width: 100%;
  padding: 0.6rem 2.5rem 0.6rem 0.85rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
}

.password-input-wrapper input:focus {
  border-color: var(--border-focus);
}

.btn-eye {
  position: absolute;
  right: 0.6rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 0.2rem;
}

.login-footer {
  margin-top: 1.75rem;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.alert-box {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  margin-bottom: 1.25rem;
}

.alert-box.error {
  background-color: var(--danger-bg);
  border: 1px solid var(--danger-border);
  color: var(--danger-text);
}

/* ----------------- Lightbox Modal ----------------- */

.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.lightbox-content {
  max-width: 90vw;
  max-height: 90vh;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox-img {
  max-width: 100%;
  max-height: 80vh;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  object-fit: contain;
}

.lightbox-close-btn {
  position: absolute;
  top: -40px;
  right: 0;
  background: transparent;
  border: none;
  color: #fff;
  font-size: 1.8rem;
  cursor: pointer;
}

.lightbox-caption {
  color: #fff;
  font-size: 0.85rem;
  margin-top: 0.75rem;
  text-align: center;
}

/* ----------------- Toast Notification ----------------- */

.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: #1e293b;
  color: #fff;
  padding: 0.7rem 1.1rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.85rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  z-index: 200;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.25s ease;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* ----------------- Responsive Mobile ----------------- */

@media (max-width: 768px) {
  .nav-inner {
    flex-direction: column;
    align-items: stretch;
    padding: 0.6rem 0.75rem;
    gap: 0.6rem;
  }

  .nav-top-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .nav-tabs {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    text-align: center;
  }

  .nav-tab-btn {
    justify-content: center;
    padding: 0.5rem 0.4rem;
    font-size: 0.8rem;
  }

  .main-content {
    padding: 0.75rem 0.75rem 2rem;
  }

  .editor-header {
    padding: 1rem 1rem 0.6rem;
  }

  .editor-body {
    padding: 1rem 1rem 1.25rem;
  }

  .note-textarea {
    min-height: 380px;
    font-size: 1rem;
  }

  .link-form {
    grid-template-columns: 1fr;
  }

  .photos-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }

  .active-note-bar {
    flex-direction: column;
    align-items: flex-start;
  }

  .active-note-controls {
    width: 100%;
    justify-content: flex-end;
    margin-left: 0;
  }
}