/*
 * WRENNA — Naturalist-Notebook × Terminal Aesthetic
 * Visual, Motion & Responsive Design System
 * 
 * CUSTOM BREAKPOINTS (content-driven, not device-driven):
 * ─────────────────────────────────────────────
 * 40rem  (640px)  — Editor + preview can share a row, each ≥18rem usable width.
 *                   Below this: stacked single-column with toggle navigation.
 * 56rem  (896px)  — File sidebar (15rem) + two panels (≈20rem each) fit
 *                   without illegible compression. Sidebar becomes persistent.
 * 72rem  (1152px) — All three panels breathe. Preview iframe gets full
 *                   comfortable width. This is the "designed-for" state.
 *
 * NEW CLASSES INTRODUCED (JS hooks needed):
 * ─────────────────────────────────────────────
 * .sidebar-open         → File sidebar open animation
 * .sidebar-closed       → File sidebar close animation
 * .modal-visible        → Modal entrance (gh-modal, gate)
 * .modal-hidden         → Modal exit
 * .toast-enter          → Toast entrance animation
 * .toast-exit           → Toast exit animation
 * .banner-collapsed     → Idle banner collapsed state
 * .banner-expanded      → Idle banner expanded state
 * .drag-active          → Drag-and-drop zone active state
 * .file-item-reveal     → Individual file item staggered reveal
 * .preview-mobile       → Viewport in mobile mode
 * .preview-desktop      → Viewport in desktop mode
 * .copied               → Share button "copied" confirmation state
 * .loading              → Generic loading state for spinners
 * .log-active           → Log panel active/loading state
 * .pane-editor          → Editor pane is active/visible
 * .pane-preview         → Preview pane is active/visible
 */

/* ═══════════════════════════════════════════════
   FOUNDATIONS
   ═══════════════════════════════════════════════ */

:root {
  --bg-deep: #1B1712;
  --panel: #241F18;
  --panel-raised: #2C261D;
  --hairline: #3A3226;
  --cream: #F0E9DC;
  --cream-dim: #B8AD98;
  --wren: #B8703C;
  --wren-bright: #D08A52;
  --moss: #7A8C5C;
  --moss-bright: #93A874;
  --gold: #D9A441;
  --danger: #B85C4C;

  /* Extended tokens */
  --shadow-sm: 0 0.0625rem 0.125rem rgba(27, 23, 18, 0.4);
  --shadow-md: 0 0.25rem 0.75rem rgba(27, 23, 18, 0.6);
  --shadow-lg: 0 0.5rem 1.5rem rgba(27, 23, 18, 0.8);
  --shadow-glow-wren: 0 0 1.25rem rgba(184, 112, 60, 0.15);
  --shadow-glow-moss: 0 0 1.25rem rgba(122, 140, 92, 0.15);
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --spring-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --spring-soft: cubic-bezier(0.22, 1.2, 0.36, 1);
  --font-display: 'Fraunces', serif;
  --font-body: 'IBM Plex Sans', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  /* Responsive breakpoints as custom properties for clarity */
  --bp-split: 40rem;
  --bp-sidebar: 56rem;
  --bp-comfortable: 72rem;

  /* Sidebar width */
  --sidebar-w: 15rem;
}

/* ═══════════════════════════════════════════════
   MOBILE-FIRST BASE LAYOUT
   Single column: editor on top, preview below,
   sidebar as overlay, toolbar condensed.
   ═══════════════════════════════════════════════ */

#root {
  background: var(--bg-deep);
  color: var(--cream);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;

  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  overflow: hidden;
}

/* ═══════════════════════════════════════════════
   FILE SIDEBAR — Mobile: overlay
   ═══════════════════════════════════════════════ */

#file-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-w);
  max-width: 85vw;
  background: var(--panel);
  border-right: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  z-index: 50;
  transform: translateX(-100%);
  opacity: 0;
  transition:
    transform var(--transition-slow) var(--spring-soft),
    opacity var(--transition-base);
  box-shadow: var(--shadow-lg);
}

#file-sidebar.sidebar-open {
  transform: translateX(0);
  opacity: 1;
  animation: sidebarLand 0.5s var(--spring-bounce) forwards;
}

#file-sidebar.sidebar-closed {
  transform: translateX(-100%);
  opacity: 0;
}

/* Desktop: sidebar becomes part of grid flow */
@media (min-width: var(--bp-sidebar)) {
  #file-sidebar {
    position: relative;
    top: auto;
    left: auto;
    bottom: auto;
    max-width: none;
    flex-shrink: 0;
    box-shadow: none;
    transform: none;
    opacity: 1;
  }

  #file-sidebar.sidebar-closed {
    transform: translateX(-100%);
    opacity: 0.8;
  }
}

/* ── File Filter ── */

#file-filter {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--hairline);
  background: var(--panel-raised);
  container-type: inline-size;
  container-name: file-filter;
}

#file-filter input {
  width: 100%;
  background: var(--bg-deep);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  color: var(--cream);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  transition: border-color var(--transition-fast);
}

#file-filter input:focus {
  outline: none;
  border-color: var(--wren);
  box-shadow: var(--shadow-glow-wren);
}

/* ── File List ── */

#file-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem 0;
  container-type: inline-size;
  container-name: file-list;
}

#file-list > div {
  padding: 0.375rem 1rem;
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  color: var(--cream-dim);
  cursor: pointer;
  transition: all var(--transition-fast);
  border-left: 0.125rem solid transparent;
  opacity: 0;
  transform: translateX(-0.5rem);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

#file-list > div.file-item-reveal {
  animation: fileReveal 0.3s var(--spring-soft) forwards;
}

#file-list > div:hover {
  background: rgba(184, 112, 60, 0.08);
  color: var(--cream);
}

#file-list > div.active {
  color: var(--wren-bright);
  border-left-color: var(--wren);
  background: rgba(184, 112, 60, 0.12);
}

/* Container query: truncate filename when list is narrow */
@container file-list (max-width: 12rem) {
  #file-list > div {
    font-size: 0.6875rem;
    padding: 0.375rem 0.625rem;
  }
}

/* ── Active File Bar ── */

#active-file-bar {
  padding: 0.5rem 1rem;
  border-top: 1px solid var(--hairline);
  background: var(--panel-raised);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--cream-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex-shrink: 0;
}

/* ═══════════════════════════════════════════════
   EDITOR PANEL — Mobile: full width, flex child
   ═══════════════════════════════════════════════ */

#editor-wrap {
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border-bottom: 1px solid var(--hairline);
  flex: 1 1 50%;
  min-height: 0;
  position: relative;
}

@media (min-width: var(--bp-split)) {
  #editor-wrap {
    border-bottom: none;
    border-right: 1px solid var(--hairline);
    flex: 1 1 50%;
  }
}

/* ── Editor Toolbar ── */

#editor-toolbar-label {
  padding: 0.625rem 1rem;
  font-family: var(--font-display);
  font-size: clamp(0.75rem, 2vw, 0.8125rem);
  font-style: italic;
  color: var(--wren);
  border-bottom: 1px solid var(--hairline);
  background: var(--panel-raised);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
  container-type: inline-size;
  container-name: editor-label;
}

#editor-toolbar-label::before {
  content: '✦';
  font-size: 0.625rem;
  opacity: 0.6;
}

#editor-toolbar-actions {
  padding: 0.375rem 0.75rem;
  border-bottom: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--panel);
  flex-wrap: wrap;
  flex-shrink: 0;
  container-type: inline-size;
  container-name: editor-actions;
}

/* Container query: collapse button labels when toolbar is narrow */
@container editor-actions (max-width: 24rem) {
  #editor-toolbar-actions .btn-label {
    display: none;
  }

  #editor-toolbar-actions button {
    padding: 0.375rem 0.5rem;
  }
}

#editor {
  flex: 1;
  font-family: var(--font-mono);
  font-size: clamp(0.75rem, 1.5vw, 0.8125rem);
  line-height: 1.6;
  padding: 1rem;
  background: transparent;
  color: var(--cream);
  border: none;
  resize: none;
  outline: none;
  tab-size: 2;
  min-height: 0;
}

#char-count {
  position: absolute;
  bottom: 0.5rem;
  right: 0.75rem;
  font-size: 0.6875rem;
  font-family: var(--font-mono);
  color: var(--cream-dim);
  opacity: 0.5;
  pointer-events: none;
}

/* ═══════════════════════════════════════════════
   PREVIEW PANEL — Mobile: full width below editor
   ═══════════════════════════════════════════════ */

#preview-wrap {
  display: flex;
  flex-direction: column;
  background: var(--bg-deep);
  flex: 1 1 50%;
  min-height: 0;
  position: relative;
}

#preview {
  flex: 1;
  border: none;
  background: white;
  border-radius: var(--radius-md);
  margin: 0.75rem;
  max-width: 100%;
  height: auto;
  box-shadow: var(--shadow-lg);
  transition:
    width var(--transition-slow) var(--spring-soft),
    border-radius var(--transition-slow) var(--spring-soft),
    margin var(--transition-slow) var(--spring-soft);
}

#preview.preview-mobile {
  width: 23.4375rem;
  max-width: calc(100% - 1.5rem);
  margin: 0.75rem auto;
  border-radius: var(--radius-xl);
}

#preview.preview-desktop {
  width: 100%;
  border-radius: var(--radius-md);
}

@media (min-width: var(--bp-comfortable)) {
  #preview {
    margin: 0.75rem 1rem;
  }
}

#empty-preview {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  color: var(--cream-dim);
  text-align: center;
  padding: 1.5rem;
  container-type: inline-size;
  container-name: empty-state;
}

#empty-preview .wren-mark {
  width: clamp(3rem, 8vw, 4rem);
  height: clamp(3rem, 8vw, 4rem);
  opacity: 0.4;
  animation: wrenIdle 3s ease-in-out infinite;
}

@container empty-state (min-width: 20rem) {
  #empty-preview {
    padding: 2rem;
  }
}

/* ═══════════════════════════════════════════════
   SPLIT LAYOUT — Editor + Preview side by side
   ═══════════════════════════════════════════════ */

@media (min-width: var(--bp-split)) {
  #root {
    flex-direction: row;
  }

  #editor-wrap,
  #preview-wrap {
    flex: 1 1 50%;
  }
}

/* ═══════════════════════════════════════════════
   FULL 3-COL LAYOUT — Sidebar + Editor + Preview
   ═══════════════════════════════════════════════ */

@media (min-width: var(--bp-sidebar)) {
  #root {
    display: grid;
    grid-template-columns: var(--sidebar-w) 1fr 1fr;
    grid-template-rows: 1fr;
    height: 100dvh;
  }

  #file-sidebar {
    grid-column: 1;
    grid-row: 1;
  }

  #editor-wrap {
    grid-column: 2;
    grid-row: 1;
  }

  #preview-wrap {
    grid-column: 3;
    grid-row: 1;
  }
}

/* ═══════════════════════════════════════════════
   BUTTONS (Shared)
   ═══════════════════════════════════════════════ */

button {
  font-family: var(--font-body);
  font-size: 0.75rem;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--hairline);
  background: var(--panel-raised);
  color: var(--cream-dim);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  white-space: nowrap;
  line-height: 1.4;
}

button:hover {
  background: var(--hairline);
  color: var(--cream);
  border-color: var(--cream-dim);
}

button:active {
  transform: scale(0.97);
}

/* ── Run Button ── */

#run-btn {
  background: var(--wren);
  color: var(--cream);
  border-color: var(--wren);
  font-weight: 500;
  position: relative;
  overflow: hidden;
}

#run-btn:hover {
  background: var(--wren-bright);
  border-color: var(--wren-bright);
  box-shadow: var(--shadow-glow-wren);
}

#run-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transform: translateX(-100%);
  transition: transform 0.4s;
}

#run-btn:hover::after {
  transform: translateX(100%);
}

#wren-hop {
  display: inline-block;
  width: 0.875rem;
  height: 0.875rem;
}

#wren-hop.loading {
  animation: wrenHop 0.6s var(--spring-bounce) infinite;
}

/* ── Share Button ── */

#share-btn {
  position: relative;
}

#share-btn.copied {
  background: var(--moss);
  border-color: var(--moss);
  color: var(--cream);
  animation: microConfirm 0.4s var(--spring-bounce);
}

/* ── Pro Button ── */

#pro-btn {
  background: transparent;
  border-color: var(--gold);
  color: var(--gold);
}

#pro-btn:hover {
  background: rgba(217, 164, 65, 0.1);
  border-color: var(--gold);
  color: var(--gold);
  box-shadow: var(--shadow-glow-moss);
}

/* ── Viewport Toggle ── */

#viewport-toggle {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  padding: 0.25rem 0.5rem;
}

/* ── GitHub Import Button ── */

#gh-import-btn {
  background: var(--panel-raised);
  border-color: var(--hairline);
}

#gh-import-btn:hover {
  border-color: var(--moss);
  color: var(--moss-bright);
}

/* ═══════════════════════════════════════════════
   IDLE BANNER
   ═══════════════════════════════════════════════ */

#idle-banner {
  background: var(--panel-raised);
  border-top: 1px solid var(--hairline);
  padding: 0.75rem 1rem;
  font-size: 0.75rem;
  color: var(--cream-dim);
  overflow: hidden;
  max-height: 3.75rem;
  flex-shrink: 0;
  transition:
    max-height 0.4s var(--spring-soft),
    padding 0.4s var(--spring-soft),
    opacity 0.3s;
}

#idle-banner.banner-collapsed {
  max-height: 0;
  padding: 0 1rem;
  opacity: 0;
}

#idle-banner.banner-expanded {
  max-height: 3.75rem;
  padding: 0.75rem 1rem;
  opacity: 1;
}

/* ═══════════════════════════════════════════════
   GITHUB IMPORT MODAL
   ═══════════════════════════════════════════════ */

#gh-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(27, 23, 18, 0.85);
  backdrop-filter: blur(0.5rem);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.3s, transform 0.4s var(--spring-soft);
  pointer-events: none;
}

#gh-modal-backdrop.modal-visible {
  opacity: 1;
  transform: scale(1);
  pointer-events: all;
}

#gh-modal-backdrop.modal-hidden {
  opacity: 0;
  transform: scale(0.95);
  pointer-events: none;
}

#gh-modal-backdrop > div {
  background: var(--panel);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  width: 100%;
  max-width: 30rem;
  box-shadow: var(--shadow-lg);
  transform: translateY(1.25rem);
  transition: transform 0.4s var(--spring-bounce);
  container-type: inline-size;
  container-name: gh-modal;
}

#gh-modal-backdrop.modal-visible > div {
  transform: translateY(0);
}

/* Container query: stack modal buttons when narrow */
@container gh-modal (max-width: 22rem) {
  #gh-modal-backdrop > div {
    padding: 1rem;
  }

  #gh-modal-backdrop .modal-actions {
    flex-direction: column;
  }

  #gh-fetch-btn {
    margin-left: 0;
    margin-top: 0.5rem;
  }
}

#gh-modal-backdrop label {
  display: block;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--cream-dim);
  margin-bottom: 0.375rem;
  margin-top: 1rem;
}

#gh-modal-backdrop label:first-of-type {
  margin-top: 0;
}

#gh-repo-input,
#gh-branch-input,
#gh-token-input {
  width: 100%;
  padding: 0.625rem 0.75rem;
  background: var(--bg-deep);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  color: var(--cream);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  transition: border-color var(--transition-fast);
}

#gh-repo-input:focus,
#gh-branch-input:focus,
#gh-token-input:focus {
  outline: none;
  border-color: var(--wren);
  box-shadow: var(--shadow-glow-wren);
}

#gh-advanced-toggle {
  background: transparent;
  border: none;
  color: var(--wren);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  cursor: pointer;
  padding: 0.5rem 0;
  margin-top: 0.75rem;
  display: block;
}

#gh-advanced {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s var(--spring-soft);
}

#gh-advanced.open {
  max-height: 12.5rem;
}

#gh-cancel-btn {
  background: transparent;
  border-color: var(--hairline);
}

#gh-fetch-btn {
  background: var(--wren);
  border-color: var(--wren);
  color: var(--cream);
  margin-left: 0.5rem;
}

#gh-fetch-btn:hover {
  background: var(--wren-bright);
  border-color: var(--wren-bright);
}

/* ── Log Panel ── */

#gh-log-panel {
  margin-top: 1rem;
  background: var(--bg-deep);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.3s var(--spring-soft);
  container-type: inline-size;
  container-name: gh-log;
}

#gh-log-panel.log-active {
  max-height: 12.5rem;
}

#gh-log-title {
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--cream-dim);
  border-bottom: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

#gh-log-spinner {
  width: 0.75rem;
  height: 0.75rem;
  animation: wrenSpin 0.8s var(--spring-bounce) infinite;
}

#gh-log-body {
  padding: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--cream-dim);
  max-height: 9.375rem;
  overflow-y: auto;
  line-height: 1.6;
}

#gh-log-close {
  background: transparent;
  border: none;
  color: var(--cream-dim);
  cursor: pointer;
  font-size: 1rem;
  padding: 0 0.25rem;
}

#gh-log-close:hover {
  color: var(--cream);
}

/* ═══════════════════════════════════════════════
   SPONSOR / AD GATE
   ═══════════════════════════════════════════════ */

#gate-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(27, 23, 18, 0.9);
  backdrop-filter: blur(0.75rem);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.4s, transform 0.5s var(--spring-bounce);
  pointer-events: none;
}

#gate-backdrop.modal-visible {
  opacity: 1;
  transform: scale(1);
  pointer-events: all;
}

#gate-backdrop.modal-hidden {
  opacity: 0;
  transform: scale(0.9);
  pointer-events: none;
}

#gate-sponsor-box {
  background: var(--panel);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-xl);
  padding: 2rem;
  width: 100%;
  max-width: 26.25rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  container-type: inline-size;
  container-name: gate-box;
}

#gate-sponsor-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    transparent 0%,
    rgba(184, 112, 60, 0.05) 25%,
    transparent 50%,
    rgba(122, 140, 92, 0.05) 75%,
    transparent 100%
  );
  background-size: 200% 200%;
  animation: shimmer 3s ease-in-out infinite;
}

/* Container query: tighter padding on small gate box */
@container gate-box (max-width: 20rem) {
  #gate-sponsor-box {
    padding: 1.5rem 1rem;
  }

  #gate-video-btn {
    padding: 0.625rem 1rem;
    font-size: 0.8125rem;
  }
}

#gate-video-btn {
  background: var(--wren);
  border-color: var(--wren);
  color: var(--cream);
  padding: 0.625rem 1.5rem;
  font-size: 0.875rem;
  margin-top: 1rem;
  position: relative;
  z-index: 1;
}

#gate-video-btn:hover {
  background: var(--wren-bright);
  border-color: var(--wren-bright);
  box-shadow: var(--shadow-glow-wren);
}

#gate-skip-btn {
  background: transparent;
  border: none;
  color: var(--cream-dim);
  font-size: 0.75rem;
  margin-top: 0.75rem;
  position: relative;
  z-index: 1;
}

#gate-skip-btn:hover {
  color: var(--cream);
}

#gate-timer {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--cream-dim);
  margin-top: 0.5rem;
  position: relative;
  z-index: 1;
}

/* ═══════════════════════════════════════════════
   TOAST NOTIFICATIONS
   ═══════════════════════════════════════════════ */

#toast-stack {
  position: fixed;
  bottom: 1rem;
  left: 1rem;
  right: 1rem;
  z-index: 300;
  display: flex;
  flex-direction: column-reverse;
  gap: 0.5rem;
  pointer-events: none;
  container-type: inline-size;
  container-name: toast-container;
}

@media (min-width: var(--bp-split)) {
  #toast-stack {
    bottom: 1.5rem;
    right: 1.5rem;
    left: auto;
    width: auto;
    max-width: 22.5rem;
  }
}

#toast-stack > div {
  background: var(--panel-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  font-size: 0.8125rem;
  color: var(--cream);
  box-shadow: var(--shadow-md);
  max-width: 100%;
  pointer-events: auto;
  opacity: 0;
  transform: translateY(1rem) scale(0.95);
}

#toast-stack > div.toast-enter {
  animation: toastIn 0.4s var(--spring-bounce) forwards;
}

#toast-stack > div.toast-exit {
  animation: toastOut 0.3s ease-in forwards;
}

/* Container query: compact toasts in narrow containers */
@container toast-container (max-width: 18rem) {
  #toast-stack > div {
    font-size: 0.75rem;
    padding: 0.5rem 0.75rem;
  }
}

/* ═══════════════════════════════════════════════
   DRAG & DROP ZONE
   ═══════════════════════════════════════════════ */

.drag-zone {
  border: 2px dashed var(--hairline);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  color: var(--cream-dim);
  transition: all var(--transition-base);
}

.drag-zone.drag-active {
  border-color: var(--wren);
  color: var(--wren-bright);
  background: rgba(184, 112, 60, 0.05);
  animation: dragPulse 1.5s ease-in-out infinite;
}

/* ═══════════════════════════════════════════════
   KEYFRAME ANIMATIONS
   All transform/opacity only for cheap rendering.
   ═══════════════════════════════════════════════ */

/* Wren hop — squash/stretch for weight & life */
@keyframes wrenHop {
  0% {
    transform: translateY(0) scale(1, 1);
  }
  15% {
    transform: translateY(0.25rem) scale(1.1, 0.9);
  }
  35% {
    transform: translateY(-0.75rem) scale(0.9, 1.1);
  }
  55% {
    transform: translateY(-0.125rem) scale(1.05, 0.95);
  }
  70% {
    transform: translateY(0.0625rem) scale(0.98, 1.02);
  }
  100% {
    transform: translateY(0) scale(1, 1);
  }
}

/* Sidebar landing — overshoot then settle */
@keyframes sidebarLand {
  0% {
    transform: translateX(-1.25rem);
    opacity: 0.5;
  }
  60% {
    transform: translateX(0.25rem);
    opacity: 1;
  }
  100% {
    transform: translateX(0);
    opacity: 1;
  }
}

/* File item staggered reveal */
@keyframes fileReveal {
  0% {
    opacity: 0;
    transform: translateX(-0.5rem);
  }
  100% {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Toast entrance — subtle 3D personality */
@keyframes toastIn {
  0% {
    opacity: 0;
    transform: translateY(1rem) scale(0.95) rotateX(-10deg);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1) rotateX(0deg);
  }
}

/* Toast exit — gentle fade down */
@keyframes toastOut {
  0% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  100% {
    opacity: 0;
    transform: translateY(0.5rem) scale(0.95);
  }
}

/* Share button micro-confirmation bounce */
@keyframes microConfirm {
  0% {
    transform: scale(1);
  }
  30% {
    transform: scale(1.08);
  }
  60% {
    transform: scale(0.96);
  }
  100% {
    transform: scale(1);
  }
}

/* Empty preview wren — gentle idle drift */
@keyframes wrenIdle {
  0%, 100% {
    transform: translateY(0) rotate(0deg);
  }
  25% {
    transform: translateY(-0.1875rem) rotate(-2deg);
  }
  75% {
    transform: translateY(-0.0625rem) rotate(2deg);
  }
}

/* Log spinner — wren-inspired scale rotation */
@keyframes wrenSpin {
  0% {
    transform: rotate(0deg) scale(1);
  }
  25% {
    transform: rotate(90deg) scale(1.1);
  }
  50% {
    transform: rotate(180deg) scale(0.9);
  }
  75% {
    transform: rotate(270deg) scale(1.05);
  }
  100% {
    transform: rotate(360deg) scale(1);
  }
}

/* Drag zone — breathing border glow */
@keyframes dragPulse {
  0%, 100% {
    border-color: var(--wren);
    box-shadow: 0 0 0 0 rgba(184, 112, 60, 0.2);
  }
  50% {
    border-color: var(--wren-bright);
    box-shadow: 0 0 1.25rem 0.25rem rgba(184, 112, 60, 0.1);
  }
}

/* Sponsor box — diagonal shimmer for "content loading" read */
@keyframes shimmer {
  0% {
    background-position: 200% 200%;
  }
  100% {
    background-position: -200% -200%;
  }
}

/* ═══════════════════════════════════════════════
   REDUCED MOTION — Full fallback
   ═══════════════════════════════════════════════ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  #wren-hop.loading {
    animation: none;
    opacity: 0.7;
  }

  #gh-log-spinner {
    animation: none;
    opacity: 0.7;
  }

  #empty-preview .wren-mark {
    animation: none;
  }

  #gate-sponsor-box::before {
    animation: none;
  }
}

/* ═══════════════════════════════════════════════
   SCROLLBAR
   ═══════════════════════════════════════════════ */

::-webkit-scrollbar {
  width: 0.5rem;
  height: 0.5rem;
}

::-webkit-scrollbar-track {
  background: var(--bg-deep);
}

::-webkit-scrollbar-thumb {
  background: var(--hairline);
  border-radius: 0.25rem;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--cream-dim);
}

/* ═══════════════════════════════════════════════
   FOCUS STATES
   ═══════════════════════════════════════════════ */

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

button:focus-visible {
  outline-offset: 2px;
}

/* ═══════════════════════════════════════════════
   UTILITIES
   ═══════════════════════════════════════════════ */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.text-wren { color: var(--wren); }
.text-moss { color: var(--moss); }
.text-gold { color: var(--gold); }
.text-cream { color: var(--cream); }
.text-dim { color: var(--cream-dim); }
.font-mono { font-family: var(--font-mono); }
.font-display { font-family: var(--font-display); }