:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-input: #1e293b;
  --border-color: #334155;
  --border-focus: #38bdf8;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --accent-color: #38bdf8;
  --accent-hover: #0284c7;
  --danger-color: #ef4444;
  --danger-hover: #dc2626;
  --success-color: #22c55e;
  --card-bg: #1e293b;
  --card-hover: #243248;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.5;
  overflow-x: hidden;
}

/* App layout */
.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 1920px;
  margin: 0 auto;
}

/* Header */
.app-header {
  height: 60px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  flex-shrink: 0;
}

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

.logo-pin {
  font-size: 24px;
}

.logo-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text-main);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
}

.search-box input {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 6px 32px 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  width: 200px;
  transition: all 0.2s;
}

.search-box input:focus {
  outline: none;
  border-color: var(--border-focus);
  width: 260px;
}

.clear-btn {
  position: absolute;
  right: 8px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 16px;
  cursor: pointer;
}

/* 3 Columns Layout */
.tag-filter-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px 0;
  flex-shrink: 0;
  font-size: 12px;
  color: var(--text-muted);
}

.tag-filter-bar select {
  min-width: 0;
  max-width: min(360px, 60vw);
  background: var(--bg-secondary);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 7px 10px;
  font: inherit;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.card-tags:empty {
  display: none;
}

.tag-chip {
  display: inline-flex;
  max-width: 100%;
  border: 1px solid var(--border-color);
  background: rgba(56, 189, 248, 0.08);
  border-radius: 999px;
  overflow: hidden;
}

.tag-name, .tag-remove {
  background: transparent;
  color: var(--accent-color);
  padding: 3px 8px;
  font-size: 12px;
  border-radius: 0;
}

.tag-name {
  min-width: 0;
  overflow-wrap: anywhere;
  text-align: left;
}

.tag-remove {
  flex-shrink: 0;
  color: var(--text-muted);
}

.tag-name:hover {
  background: var(--bg-tertiary);
}

.tag-remove:hover {
  color: var(--danger-color);
}

.tag-form {
  display: flex;
  gap: 6px;
}

.tag-input {
  width: 100%;
  min-width: 0;
  background: var(--bg-primary);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 6px 8px;
  font: inherit;
  font-size: 12px;
}

.tag-input:focus, .tag-filter-bar select:focus-visible {
  outline: 1px solid var(--border-focus);
  border-color: var(--border-focus);
}

.tag-form .btn-sm {
  flex-shrink: 0;
}

button:disabled, .tag-input:disabled {
  opacity: 0.5;
  cursor: wait;
}

.columns-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  padding: 20px 24px;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.column-panel {
  display: flex;
  flex-direction: column;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 16px;
  min-height: 0;
  overflow: hidden;
}

.column-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  flex-shrink: 0;
}

.column-title {
  display: flex;
  align-items: center;
  gap: 8px;
}

.column-title h2 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-main);
}

.count-badge {
  background-color: var(--bg-tertiary);
  color: var(--text-muted);
  font-size: 12px;
  padding: 1px 8px;
  border-radius: 9999px;
  font-weight: 500;
}

/* Input Area / Dropzone */
.input-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px;
  margin-bottom: 14px;
  flex-shrink: 0;
}

.input-card textarea {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--text-main);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 13px;
  resize: vertical;
  min-height: 70px;
  outline: none;
  line-height: 1.5;
}

.input-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
  border-top: 1px solid var(--border-color);
  padding-top: 8px;
}

.tip-shortcut {
  font-size: 11px;
  color: var(--text-dim);
}

/* Dropzone */
.dropzone {
  border: 2px dashed var(--border-color);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 20px 12px;
  text-align: center;
  margin-bottom: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.dropzone:hover, .dropzone.drag-active {
  border-color: var(--accent-color);
  background-color: rgba(56, 189, 248, 0.05);
}

.dropzone-icon {
  color: var(--text-muted);
  margin-bottom: 6px;
}

.dropzone-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-main);
}

.dropzone-sub {
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 2px;
}

.hidden-input {
  display: none;
}

/* Items list */
.items-list {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-right: 4px;
}

.items-list::-webkit-scrollbar {
  width: 6px;
}
.items-list::-webkit-scrollbar-track {
  background: transparent;
}
.items-list::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 3px;
}

/* Item cards */
.item-card {
  flex-shrink: 0;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: transform 0.15s ease, border-color 0.15s ease;
  position: relative;
}

.item-card:hover {
  border-color: var(--text-dim);
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 12px;
  color: var(--text-dim);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 6px;
}

.card-time {
  font-size: 11px;
}

.card-size {
  background-color: var(--bg-tertiary);
  color: var(--text-muted);
  padding: 0 4px;
  border-radius: 4px;
  font-size: 10px;
}

.card-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-pin {
  padding: 5px;
  background: transparent;
  color: var(--text-muted);
}

.btn-pin:hover, .btn-pin.pinned {
  color: var(--accent-color);
  background: rgba(56, 189, 248, 0.12);
}

.item-card.is-pinned {
  border-color: var(--accent-color);
}

/* Text Content */
.text-content {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 13px;
  line-height: 1.5;
  color: #e2e8f0;
  background-color: var(--bg-primary);
  border-radius: var(--radius-sm);
  padding: 10px;
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 280px;
  overflow-y: auto;
  user-select: text;
}

/* Image Item */
.image-thumbnail-wrap {
  width: 100%;
  height: 180px;
  background-color: var(--bg-primary);
  border-radius: var(--radius-sm);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
}

.image-thumbnail-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.2s ease;
}

.image-thumbnail-wrap:hover img {
  transform: scale(1.03);
}

.image-filename {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* File Item */
.file-card-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 0;
}

.file-icon-box {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background-color: rgba(56, 189, 248, 0.12);
  color: var(--accent-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 12px;
  text-transform: uppercase;
  flex-shrink: 0;
}

.file-details {
  flex: 1;
  min-width: 0;
}

.file-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Buttons */
button {
  cursor: pointer;
  border: none;
  font-family: inherit;
  font-size: 13px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.btn-primary {
  background-color: var(--accent-color);
  color: #0f172a;
  font-weight: 600;
  padding: 6px 14px;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  color: #ffffff;
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  padding: 6px 12px;
}

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

.btn-sm {
  background-color: var(--bg-tertiary);
  color: var(--text-muted);
  padding: 4px 10px;
  font-size: 12px;
  text-decoration: none;
}

.btn-sm:hover {
  background-color: var(--accent-color);
  color: #0f172a;
}

.btn-copy {
  background-color: var(--bg-tertiary);
  color: var(--text-main);
  padding: 4px 10px;
  font-size: 12px;
}

.btn-copy:hover {
  background-color: #0284c7;
  color: #fff;
}

.btn-copy.copied {
  background-color: var(--success-color);
  color: #fff;
}

.btn-delete {
  background: transparent;
  color: var(--text-dim);
  padding: 4px 6px;
}

.btn-delete:hover {
  color: var(--danger-color);
  background-color: rgba(239, 68, 68, 0.12);
}

.empty-placeholder {
  text-align: center;
  color: var(--text-dim);
  font-size: 13px;
  padding: 40px 10px;
}

/* Lightbox Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal.hidden {
  display: none;
}

.modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(4px);
}

.lightbox-content {
  position: relative;
  z-index: 1001;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-lg);
}

.lightbox-content img {
  max-width: 85vw;
  max-height: 75vh;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.modal-close-btn {
  position: absolute;
  top: 10px;
  right: 14px;
  background: transparent;
  color: var(--text-muted);
  font-size: 28px;
  line-height: 1;
}

.modal-close-btn:hover {
  color: var(--text-main);
}

.lightbox-footer {
  margin-top: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  color: var(--text-muted);
  font-size: 13px;
}

.lightbox-actions {
  display: flex;
  gap: 10px;
}

/* Login Modal */
.login-card {
  position: relative;
  z-index: 1001;
  width: 90%;
  max-width: 400px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.login-icon {
  font-size: 36px;
  margin-bottom: 8px;
  display: block;
}

.login-header h2 {
  font-size: 20px;
  margin-bottom: 6px;
}

.login-header p {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.login-card input {
  width: 100%;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 15px;
  margin-bottom: 14px;
  outline: none;
}

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

.btn-block {
  width: 100%;
  padding: 10px 0;
  font-size: 15px;
}

.login-error {
  color: var(--danger-color);
  font-size: 12px;
  margin-bottom: 12px;
}

.hidden {
  display: none !important;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  background-color: #1e293b;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 10px 18px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 13px;
  animation: slideIn 0.25s ease-out;
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 1024px) {
  .columns-grid {
    grid-template-columns: 1fr;
    overflow-y: auto;
  }
  .app-container {
    height: auto;
    min-height: 100vh;
  }
  .column-panel {
    height: 580px;
  }
}