/* ===== CSS Variables ===== */
:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #1c2333;
  --bg-card: #1c2333;
  --bg-card-hover: #252d3d;
  --bg-input: #0d1117;
  --border: #30363d;
  --border-light: #3d444d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --accent-bg: rgba(88, 166, 255, 0.12);
  --green: #3fb950;
  --orange: #d29922;
  --red: #f85149;
  --sidebar-width: 300px;
  --topbar-height: 52px;
  --toolbar-height: 48px;
  --radius: 8px;
  --radius-sm: 6px;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  --transition: 0.2s ease;
}

/* ===== Reset ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 15px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  display: flex;
  min-height: 100vh;
  overflow: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  color: var(--accent-hover);
}

button {
  font-family: inherit;
  cursor: pointer;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--border-light);
}

/* ===== Utility ===== */
.hidden {
  display: none !important;
}

/* ===== Sidebar ===== */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: relative;
  z-index: 100;
  transition: transform var(--transition);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 16px 12px;
  border-bottom: 1px solid var(--border);
}

.logo {
  font-size: 1.1rem;
  font-weight: 700;
  white-space: nowrap;
  background: linear-gradient(135deg, var(--accent), #a371f7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  cursor: pointer;
  user-select: none;
}

.sidebar-close {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.2rem;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}
.sidebar-close:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

/* Search */
.search-wrapper {
  padding: 12px 16px;
  position: relative;
}

.search-icon {
  position: absolute;
  left: 26px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.85rem;
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 8px 12px 8px 34px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition);
}
.search-input::placeholder {
  color: var(--text-muted);
}
.search-input:focus {
  border-color: var(--accent);
}

/* File tree */
.file-tree {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

.tree-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 16px;
  cursor: pointer;
  transition: background var(--transition);
  font-size: 0.9rem;
  color: var(--text-primary);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}
.tree-item:hover {
  background: var(--bg-tertiary);
}
.tree-item.active {
  background: var(--accent-bg);
  color: var(--accent);
}

.tree-item-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
  width: 22px;
  text-align: center;
}

.tree-item-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tree-item-arrow {
  color: var(--text-muted);
  font-size: 0.75rem;
  flex-shrink: 0;
}

/* Sidebar overlay for mobile */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 99;
  backdrop-filter: blur(2px);
}

/* ===== Main ===== */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* Topbar */
.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 20px;
  height: var(--topbar-height);
  min-height: var(--topbar-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-size: 1.2rem;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}
.menu-btn:hover {
  background: var(--bg-tertiary);
}

/* Breadcrumbs */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.88rem;
  overflow-x: auto;
  white-space: nowrap;
  flex: 1;
}

.crumb {
  color: var(--text-secondary);
  padding: 4px 6px;
  border-radius: 4px;
  transition: background var(--transition), color var(--transition);
}
.crumb:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}
.crumb.active {
  color: var(--text-primary);
  font-weight: 600;
}

.crumb-sep {
  color: var(--text-muted);
  user-select: none;
  font-size: 0.8rem;
}

/* Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 20px;
  height: var(--toolbar-height);
  min-height: var(--toolbar-height);
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border);
}

.toolbar-filename {
  flex: 1;
  font-weight: 600;
  font-size: 0.92rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.toolbar-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
  white-space: nowrap;
  text-decoration: none;
}
.btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-light);
  color: var(--text-primary);
}

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

.btn-back {
  border: none;
  background: none;
  color: var(--accent);
  padding: 6px 8px;
}
.btn-back:hover {
  background: var(--accent-bg);
}

/* ===== Content ===== */
.content {
  flex: 1;
  overflow-y: auto;
  padding: 0;
  position: relative;
}

/* File grid */
.file-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
  padding: 20px;
}

.file-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition),
    transform var(--transition);
}
.file-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-light);
  transform: translateY(-1px);
}

.file-card-icon {
  font-size: 1.6rem;
  flex-shrink: 0;
  width: 36px;
  text-align: center;
}

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

.file-card-name {
  font-weight: 600;
  font-size: 0.92rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-card-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 3px;
}

.file-card-arrow {
  color: var(--text-muted);
  font-size: 0.9rem;
  flex-shrink: 0;
}

/* ===== Viewer ===== */
.viewer {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
}

.viewer iframe {
  flex: 1;
  width: 100%;
  border: none;
  background: var(--bg-primary);
}

/* Viewer loading overlay */
.viewer-loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: var(--bg-primary);
  z-index: 5;
  transition: opacity 0.3s ease;
}
.viewer-loading.loaded {
  opacity: 0;
  pointer-events: none;
}
.viewer-loading p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin: 0;
}
.viewer-loading-note {
  font-size: 0.82rem !important;
  color: var(--text-muted) !important;
  background: var(--bg-tertiary);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.viewer-fallback {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 6px 16px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
  opacity: 0.5;
  transition: opacity var(--transition), padding var(--transition);
}
.viewer-fallback:hover,
.viewer-fallback:focus-within {
  opacity: 1;
  padding: 8px 16px;
}

.viewer-fallback p {
  color: var(--text-muted);
  font-size: 0.75rem;
}

.viewer-fallback .btn {
  padding: 4px 10px;
  font-size: 0.75rem;
  min-height: unset;
  border-color: var(--border);
  background: transparent;
  color: var(--text-secondary);
}
.viewer-fallback .btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}
.viewer-fallback .btn-primary {
  background: transparent;
  border-color: var(--accent);
  color: var(--accent);
}
.viewer-fallback .btn-primary:hover {
  background: var(--accent-bg);
}

/* ===== Error & Empty States ===== */
.error-state,
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 60px 20px;
  text-align: center;
  position: absolute;
  inset: 0;
}

.error-icon,
.empty-icon {
  font-size: 3rem;
}

.error-state h2,
.empty-state h2 {
  font-size: 1.25rem;
  font-weight: 600;
}

.error-state p,
.empty-state p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: 400px;
}

/* ===== Loading Spinner ===== */
.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 40px 20px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  grid-column: 1 / -1;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ===== Rate Limit Banner ===== */
.rate-limit-banner {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  background: rgba(210, 153, 34, 0.15);
  border-bottom: 1px solid var(--orange);
  color: var(--orange);
  font-size: 0.85rem;
}
.rate-limit-banner span {
  flex: 1;
}
.rate-limit-banner button {
  background: none;
  border: none;
  color: var(--orange);
  font-size: 1.1rem;
  padding: 2px 6px;
}

/* ===== Responsive ===== */

/* Tablet & mobile */
@media (max-width: 768px) {
  /* Sidebar becomes a fixed drawer */
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 280px;
    min-width: 280px;
    transform: translateX(-100%);
    z-index: 200;
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.5);
  }
  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-overlay.open {
    display: block;
  }

  .sidebar-close {
    display: block;
  }

  .menu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    min-height: 40px;
  }

  /* Larger touch targets for tree items */
  .tree-item {
    padding: 12px 16px;
    font-size: 0.92rem;
    min-height: 44px;
  }

  /* Topbar */
  .topbar {
    padding: 0 12px;
    gap: 8px;
  }

  .breadcrumbs {
    font-size: 0.82rem;
    gap: 2px;
    -webkit-overflow-scrolling: touch;
  }

  .crumb {
    padding: 6px 5px;
  }

  /* Toolbar compact single row on mobile */
  .toolbar {
    padding: 6px 12px;
    gap: 8px;
    height: auto;
    min-height: 40px;
  }

  .toolbar-filename {
    font-size: 0.82rem;
    min-width: 0;
  }

  .btn-back {
    padding: 4px 6px;
    font-size: 0.82rem;
  }

  .toolbar-actions {
    gap: 4px;
  }

  /* File grid single column */
  .file-grid {
    grid-template-columns: 1fr;
    padding: 12px;
    gap: 8px;
  }

  /* Larger card touch targets */
  .file-card {
    padding: 14px;
    min-height: 56px;
  }

  .file-card-icon {
    font-size: 1.4rem;
    width: 32px;
  }

  /* Buttons */
  .btn {
    padding: 8px 12px;
    font-size: 0.82rem;
    min-height: 40px;
  }

  /* Viewer fallback stays inline but compact */
  .viewer-fallback {
    padding: 5px 12px;
    gap: 8px;
  }

  .viewer-fallback p {
    font-size: 0.7rem;
  }

  /* Error/empty states */
  .error-state,
  .empty-state {
    padding: 40px 16px;
  }

  .error-icon,
  .empty-icon {
    font-size: 2.5rem;
  }

  .error-state h2,
  .empty-state h2 {
    font-size: 1.1rem;
  }

  /* Search */
  .search-input {
    padding: 10px 12px 10px 36px;
    font-size: 1rem;
  }
}

/* Small phones */
@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .sidebar {
    width: 260px;
    min-width: 260px;
  }

  .logo {
    font-size: 1rem;
  }

  .toolbar-filename {
    max-width: 100%;
    font-size: 0.8rem;
  }

  .file-card-name {
    font-size: 0.85rem;
  }

  .file-card-meta {
    font-size: 0.72rem;
  }

  .breadcrumbs {
    font-size: 0.78rem;
  }

  .viewer-loading-note {
    font-size: 0.75rem !important;
    padding: 6px 12px;
  }
}

/* Safe area for notched phones */
@supports (padding: env(safe-area-inset-bottom)) {
  .topbar {
    padding-left: max(12px, env(safe-area-inset-left));
    padding-right: max(12px, env(safe-area-inset-right));
  }

  .toolbar {
    padding-left: max(12px, env(safe-area-inset-left));
    padding-right: max(12px, env(safe-area-inset-right));
  }

  .viewer-fallback {
    padding-bottom: max(12px, env(safe-area-inset-bottom));
  }
}

/* ===== Toast Pill (Android-style) ===== */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(0);
  background: #252d3d;
  color: #e6edf3;
  border: 1px solid var(--border-light);
  padding: 10px 20px;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 500;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
  z-index: 1000;
  pointer-events: none;
  opacity: 1;
  transition: opacity 0.25s ease, transform 0.25s ease;
  white-space: nowrap;
}

.toast.hidden {
  display: none !important;
}

/* ===== Developer Options Modal ===== */
.dev-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.dev-overlay.hidden {
  display: none !important;
}

.dev-modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 440px;
  padding: 24px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  gap: 14px;
  animation: modalPop 0.2s ease-out;
}

@keyframes modalPop {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.dev-modal h3 {
  font-size: 1.1rem;
  color: var(--text-primary);
  margin: 0;
}

.dev-modal label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.dev-input {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition);
}

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

.dev-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin: -4px 0 6px;
}

.dev-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 6px;
}