:root {
  color-scheme: light dark;

  /* Warm paper & forest-pine ink palette (OKLCH with hex fallbacks) */
  --bg-canvas: #f5f3ed;
  --bg-surface: #fcfbf8;
  --bg-subtle: #edeae1;
  --bg-code: #f1efe8;
  --text-primary: #1a1c1a;
  --text-secondary: #555954;
  --text-muted: #767b74;
  --border-hairline: rgba(26, 28, 26, 0.09);
  --border-strong: rgba(26, 28, 26, 0.17);

  --accent: #1f4d3a;
  --accent-hover: #173c2d;
  --accent-fg: #f7f6f2;
  --accent-tint: #e3ede7;
  --accent-tint-fg: #183d2e;

  --pin-bg: #f3ead3;
  --pin-fg: #6b4e10;

  --danger: #a62c2b;
  --danger-tint: #faeaea;

  --shadow-card: 0 1px 3px rgba(24, 22, 18, 0.08), 0 1px 2px rgba(24, 22, 18, 0.04);
  --shadow-float: 0 8px 24px rgba(24, 22, 18, 0.14);

  /* Named radius scale */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;
  --r-pill: 9999px;

  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "HarmonyOS Sans SC", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", ui-monospace, Menlo, Consolas, "HarmonyOS Sans SC", monospace;
}

@supports (color: oklch(0.5 0.1 160)) {
  :root {
    --bg-canvas: oklch(0.964 0.008 88);
    --bg-surface: oklch(0.991 0.004 88);
    --bg-subtle: oklch(0.935 0.010 88);
    --bg-code: oklch(0.950 0.008 88);
    --text-primary: oklch(0.21 0.01 150);
    --text-secondary: oklch(0.45 0.01 150);
    --text-muted: oklch(0.57 0.01 150);
    --accent: oklch(0.39 0.075 160);
    --accent-hover: oklch(0.33 0.070 160);
    --accent-tint: oklch(0.93 0.022 160);
    --accent-tint-fg: oklch(0.32 0.065 160);
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-canvas: #0d0f0e;
    --bg-surface: rgba(255, 255, 255, 0.035);
    --bg-subtle: rgba(255, 255, 255, 0.065);
    --bg-code: rgba(255, 255, 255, 0.045);
    --text-primary: #eceee9;
    --text-secondary: #a3a9a2;
    --text-muted: #767d75;
    --border-hairline: rgba(255, 255, 255, 0.075);
    --border-strong: rgba(255, 255, 255, 0.15);

    --accent: #388564;
    --accent-hover: #439974;
    --accent-fg: #f4f7f5;
    --accent-tint: rgba(56, 133, 100, 0.18);
    --accent-tint-fg: #90d5b5;

    --pin-bg: rgba(217, 169, 62, 0.16);
    --pin-fg: #eac36b;

    --danger: #e26d6c;
    --danger-tint: rgba(226, 109, 108, 0.15);

    --shadow-card: none;
    --shadow-float: 0 12px 32px rgba(0, 0, 0, 0.55);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.65;
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
  padding-bottom: env(safe-area-inset-bottom);
}

button,
input,
textarea {
  font: inherit;
  color: inherit;
  touch-action: manipulation;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Auth Shell */
.auth-shell {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 24px 16px;
}

.auth-panel {
  width: 100%;
  max-width: 400px;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  box-shadow: var(--shadow-card);
  border-radius: var(--r-lg);
  padding: 28px 24px;
}

.auth-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 22px;
}

.brand-mark {
  flex-shrink: 0;
  border-radius: 7px;
}

.auth-brand h1 {
  margin: 0;
  font-size: 19px;
  font-weight: 650;
  line-height: 1.3;
}

.auth-sub {
  margin: 3px 0 0;
  font-size: 13px;
  color: var(--text-secondary);
}

.field-label {
  display: block;
  font-size: 13px;
  font-weight: 550;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.auth-form input {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg-canvas);
}

.form-error {
  margin: 10px 0 0;
  padding: 8px 10px;
  border-radius: var(--r-sm);
  background: var(--danger-tint);
  color: var(--danger);
  font-size: 13px;
}

.auth-submit {
  width: 100%;
  margin-top: 16px;
}

/* Topbar */
.app-shell {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 16px 48px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0 12px;
  border-bottom: 1px solid var(--border-hairline);
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 9px;
}

.brand-name {
  font-size: 17px;
  font-weight: 680;
  letter-spacing: -0.012em;
}

.conn-indicator {
  width: 8px;
  height: 8px;
  border-radius: var(--r-pill);
  background: var(--text-muted);
  transition: background-color 160ms cubic-bezier(0.16, 1, 0.3, 1);
}

.conn-indicator[data-live="true"] {
  background: #2b8a57;
}

.topbar-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.quota-text {
  font-size: 12.5px;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 40px;
  padding: 0 14px;
  border-radius: var(--r-sm);
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 540;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color 140ms cubic-bezier(0.16, 1, 0.3, 1),
              border-color 140ms cubic-bezier(0.16, 1, 0.3, 1),
              color 140ms cubic-bezier(0.16, 1, 0.3, 1),
              transform 120ms cubic-bezier(0.16, 1, 0.3, 1);
}

.btn:active:not(:disabled) {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-fg);
}

@media (hover: hover) {
  .btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
  }
}

.btn-secondary {
  background: var(--bg-subtle);
  color: var(--text-primary);
  border-color: var(--border-hairline);
}

@media (hover: hover) {
  .btn-secondary:hover:not(:disabled) {
    border-color: var(--border-strong);
  }
}

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

@media (hover: hover) {
  .btn-ghost:hover:not(:disabled) {
    background: var(--bg-subtle);
    color: var(--text-primary);
  }
}

.btn-compact {
  min-height: 40px;
  padding: 0 11px;
  font-size: 13px;
}

.danger-text {
  color: var(--danger);
}

.chip-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 40px;
  padding: 0 11px;
  border-radius: var(--r-pill);
  border: 1px solid var(--border-hairline);
  background: var(--bg-surface);
  font-size: 13px;
  color: var(--text-primary);
}

@media (hover: hover) {
  .chip-btn:hover {
    border-color: var(--border-strong);
  }
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--text-secondary);
  transition: background-color 140ms cubic-bezier(0.16, 1, 0.3, 1),
              color 140ms cubic-bezier(0.16, 1, 0.3, 1);
}

@media (hover: hover) {
  .icon-btn:hover {
    background: var(--bg-subtle);
    color: var(--text-primary);
  }
}

/* Composer Deck */
.workspace {
  margin-top: 18px;
}

.composer-deck {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  box-shadow: var(--shadow-card);
  border-radius: var(--r-lg);
  padding: 10px;
}

.composer-textarea {
  width: 100%;
  min-height: 84px;
  max-height: 280px;
  resize: vertical;
  padding: 10px 11px;
  border: 1px solid var(--border-hairline);
  border-radius: var(--r-sm);
  background: var(--bg-canvas);
  line-height: 1.7;
}

.composer-textarea::placeholder {
  color: var(--text-muted);
}

.composer-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 8px;
  flex-wrap: wrap;
}

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

.device-editor {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border-hairline);
  flex-wrap: wrap;
}

.device-editor-label {
  font-size: 13px;
  color: var(--text-secondary);
}

.device-editor input {
  flex: 1;
  min-width: 160px;
  min-height: 40px;
  padding: 6px 10px;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-sm);
  background: var(--bg-canvas);
}

/* Upload Progress */
.upload-panel {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: var(--r-sm);
  background: var(--bg-subtle);
}

.upload-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.upload-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.upload-title {
  font-size: 13.5px;
  font-weight: 560;
  word-break: break-word;
}

.upload-metrics {
  font-size: 12.5px;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

.upload-controls {
  display: flex;
  align-items: center;
  gap: 6px;
}

.progress-track {
  height: 6px;
  margin-top: 8px;
  border-radius: var(--r-pill);
  background: var(--border-hairline);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 100%;
  background: var(--accent);
  transform-origin: left center;
  transform: scaleX(0);
  transition: transform 150ms cubic-bezier(0.16, 1, 0.3, 1);
}

.upload-error {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--danger);
}

/* Timeline */
.timeline-section {
  margin-top: 24px;
}

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

.timeline-title-group {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.timeline-title-group h2 {
  margin: 0;
  font-size: 16px;
  font-weight: 650;
}

.retention-hint {
  font-size: 12.5px;
  color: var(--text-muted);
}

.timeline-header-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.empty-state {
  padding: 44px 20px;
  border: 1px dashed var(--border-strong);
  border-radius: var(--r-lg);
  text-align: left;
}

.empty-title {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
}

.empty-desc {
  margin: 6px 0 0;
  font-size: 13.5px;
  color: var(--text-secondary);
  max-width: 56ch;
}

.timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.item-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  box-shadow: var(--shadow-card);
  border-radius: var(--r-md);
  padding: 14px 16px;
}

.item-card[data-pinned="true"] {
  border-color: rgba(180, 134, 32, 0.35);
}

.item-meta-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.item-badges {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  min-width: 0;
  flex: 1;
  padding-top: 4px;
  font-size: 12.5px;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: var(--r-pill);
  font-size: 12px;
  font-weight: 540;
  background: var(--bg-subtle);
  color: var(--text-secondary);
}

.badge-pin {
  background: var(--pin-bg);
  color: var(--pin-fg);
}

.item-top-tools {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-shrink: 0;
  margin-top: -4px;
  margin-right: -6px;
}

.icon-btn[data-active="true"] {
  color: var(--pin-fg);
}

/* Text Card Body */
.text-body {
  margin: 0;
  padding: 11px 13px;
  border-radius: var(--r-sm);
  background: var(--bg-code);
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.72;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 300px;
  overflow-y: auto;
}

/* Image Card Body */
.image-frame {
  display: inline-block;
  max-width: 100%;
  border-radius: var(--r-sm);
  overflow: hidden;
  background: var(--bg-code);
  outline: 1px solid var(--border-hairline);
  outline-offset: -1px;
  cursor: zoom-in;
}

.image-frame img {
  display: block;
  max-width: 100%;
  max-height: 320px;
  width: auto;
  height: auto;
  object-fit: contain;
}

/* File / Folder Summary Row */
.file-summary {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.file-type-glyph {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--r-sm);
  background: var(--accent-tint);
  color: var(--accent-tint-fg);
  display: grid;
  place-items: center;
}

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

.file-title {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  word-break: break-word;
}

.file-sub {
  margin: 2px 0 0;
  font-size: 12.5px;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

/* Item Footer Actions */
.item-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.btn-copied {
  background: var(--accent-tint);
  color: var(--accent-tint-fg);
  border-color: transparent;
}

/* Folder Tree Disclosure (compositor/grid reveal, no height animation) */
.folder-tree-wrap {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

.folder-tree-wrap[data-open="true"] {
  grid-template-rows: 1fr;
}

.folder-tree-inner {
  overflow: hidden;
}

.folder-tree-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 6px 0;
  border-top: 1px solid var(--border-hairline);
  max-height: 320px;
  overflow-y: auto;
}

.folder-entry {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 4px 6px;
  border-radius: var(--r-sm);
  font-size: 13px;
}

@media (hover: hover) {
  .folder-entry:hover {
    background: var(--bg-subtle);
  }
}

.folder-entry-path {
  font-family: var(--font-mono);
  font-size: 12.5px;
  word-break: break-all;
  min-width: 0;
  flex: 1;
}

.folder-entry-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted);
}

.entry-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 8px;
  color: var(--accent-tint-fg);
  text-decoration: none;
  font-weight: 540;
  border-radius: var(--r-sm);
}

@media (hover: hover) {
  .entry-link:hover {
    background: var(--accent-tint);
  }
}

/* Drag Overlay */
.drop-overlay {
  position: fixed;
  inset: 0;
  z-index: 60;
  background: rgba(18, 22, 20, 0.52);
  display: grid;
  place-items: center;
  padding: 24px;
}

.drop-overlay-box {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 2px dashed var(--accent);
  border-radius: var(--r-lg);
  padding: 36px 32px;
  text-align: center;
  box-shadow: var(--shadow-float);
}

.drop-overlay-title {
  margin: 12px 0 4px;
  font-size: 17px;
  font-weight: 640;
}

.drop-overlay-sub {
  margin: 0;
  font-size: 13.5px;
  color: var(--text-secondary);
}

/* Lightbox */
.lightbox {
  border: none;
  padding: 0;
  width: min(94vw, 1080px);
  max-height: 92dvh;
  border-radius: var(--r-lg);
  background: #121413;
  color: #f0f2ef;
  box-shadow: var(--shadow-float);
  overscroll-behavior: contain;
}

.lightbox::backdrop {
  background: rgba(0, 0, 0, 0.72);
}

.lightbox-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 12px 8px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.lightbox-title {
  font-size: 13.5px;
  color: #d6dad5;
  word-break: break-all;
}

.lightbox-close-btn {
  color: #e4e7e3;
}

.lightbox-body {
  display: grid;
  place-items: center;
  padding: 12px;
  max-height: calc(92dvh - 58px);
  overflow: auto;
}

.lightbox-body img {
  max-width: 100%;
  max-height: calc(92dvh - 84px);
  object-fit: contain;
}

/* Toast */
.toast {
  position: fixed;
  left: 50%;
  bottom: max(20px, env(safe-area-inset-bottom, 20px));
  transform: translateX(-50%);
  z-index: 80;
  background: var(--text-primary);
  color: var(--bg-canvas);
  padding: 9px 16px;
  border-radius: var(--r-pill);
  font-size: 13.5px;
  font-weight: 540;
  box-shadow: var(--shadow-float);
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

@media (max-width: 560px) {
  .app-shell {
    padding: 0 12px 36px;
  }

  .topbar {
    flex-wrap: nowrap;
  }

  .topbar-meta {
    flex-wrap: nowrap;
    gap: 6px;
  }

  .quota-text {
    display: none;
  }

  .composer-bar {
    align-items: center;
  }

  .composer-actions {
    gap: 6px;
  }

  .composer-actions .btn {
    padding: 0 10px;
    font-size: 13px;
  }

  #send-text-btn {
    margin-left: auto;
  }

  .item-card {
    padding: 12px 13px;
  }
}