/* ===================== Design tokens ===================== */
:root {
  --accent: #3b5bfd;
  --accent-dark: #2a44d6;
  --accent-soft: #e8ecff;
  --danger: #e0483e;
  --danger-soft: #fdeceb;
  --success: #1a9c6b;

  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-2: #f0f1f6;
  --border: #e3e5ee;
  --text: #191b26;
  --text-muted: #62667a;
  --text-faint: #9296a8;
  --shadow: 0 1px 2px rgba(20, 22, 40, 0.04), 0 8px 24px rgba(20, 22, 40, 0.06);
  --shadow-lg: 0 12px 40px rgba(20, 22, 40, 0.14);
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 20px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Noto Sans JP", "Noto Sans SC", "PingFang SC", Roboto, Helvetica, Arial,
    sans-serif;
}

:root[data-theme="dark"] {
  --accent: #6d87ff;
  --accent-dark: #8fa2ff;
  --accent-soft: #212a4d;
  --danger: #ff6b61;
  --danger-soft: #3a1f1f;
  --success: #35c98c;

  --bg: #0e0f14;
  --surface: #171922;
  --surface-2: #1e2029;
  --border: #2a2d3a;
  --text: #eef0f6;
  --text-muted: #a4a8bb;
  --text-faint: #6c7085;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --accent: #6d87ff;
    --accent-dark: #8fa2ff;
    --accent-soft: #212a4d;
    --danger: #ff6b61;
    --danger-soft: #3a1f1f;
    --success: #35c98c;

    --bg: #0e0f14;
    --surface: #171922;
    --surface-2: #1e2029;
    --border: #2a2d3a;
    --text: #eef0f6;
    --text-muted: #a4a8bb;
    --text-faint: #6c7085;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  }
}

/* ===================== Reset ===================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html,
body {
  padding: 0;
  margin: 0;
}
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.2s ease, color 0.2s ease;
}
img {
  max-width: 100%;
  display: block;
}
button {
  font-family: inherit;
}
a {
  color: inherit;
}
.hidden {
  display: none !important;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ===================== Layout shell ===================== */
.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===================== Header ===================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 68px;
  flex-wrap: wrap;
  padding-top: 10px;
  padding-bottom: 10px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-right: auto;
  text-decoration: none;
  cursor: pointer;
  border: none;
  background: none;
  padding: 0;
}
.brand img {
  height: 28px;
  width: auto;
}
:root[data-theme="dark"] .brand img {
  filter: invert(1) brightness(1.9);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .brand img {
    filter: invert(1) brightness(1.9);
  }
}
.brand-name {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--text);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease,
    transform 0.1s ease;
}
.icon-btn:hover {
  background: var(--surface-2);
  border-color: var(--text-faint);
}
.icon-btn:active {
  transform: scale(0.94);
}
.icon-btn svg {
  width: 18px;
  height: 18px;
}
#theme-icon-moon {
  display: none;
}
:root[data-theme="dark"] #theme-icon-sun {
  display: none;
}
:root[data-theme="dark"] #theme-icon-moon {
  display: block;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) #theme-icon-sun {
    display: none;
  }
  :root:not([data-theme="light"]) #theme-icon-moon {
    display: block;
  }
}

.lang-switch {
  position: relative;
}
.lang-switch select {
  appearance: none;
  -webkit-appearance: none;
  font: inherit;
  font-weight: 600;
  font-size: 0.85rem;
  height: 38px;
  padding: 0 30px 0 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}
.lang-switch::after {
  content: "";
  position: absolute;
  right: 12px;
  top: 50%;
  width: 7px;
  height: 7px;
  border-right: 1.6px solid var(--text-muted);
  border-bottom: 1.6px solid var(--text-muted);
  transform: translateY(-65%) rotate(45deg);
  pointer-events: none;
}

/* ===================== Hero ===================== */
.hero {
  padding: 64px 0 40px;
  text-align: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-dark);
  background: var(--accent-soft);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(1.9rem, 4.5vw, 3.1rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  font-weight: 800;
}
.hero h1 span {
  color: var(--accent);
}
.hero p {
  max-width: 620px;
  margin: 0 auto;
  color: var(--text-muted);
  font-size: 1.05rem;
}
/* ===================== Tool grid ===================== */
.tools-section {
  padding: 20px 0 70px;
}
.section-heading {
  text-align: center;
  margin-bottom: 34px;
}
.section-heading h2 {
  font-size: 1.6rem;
  margin: 0 0 8px;
  font-weight: 800;
  letter-spacing: -0.01em;
}
.section-heading p {
  color: var(--text-muted);
  margin: 0;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
@media (max-width: 980px) {
  .tool-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (max-width: 720px) {
  .tool-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 460px) {
  .tool-grid {
    grid-template-columns: 1fr;
  }
}

.tool-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s;
  box-shadow: var(--shadow);
}
.tool-card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
  box-shadow: var(--shadow-lg);
}
.tool-card .tool-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  color: var(--accent-dark);
  flex: none;
}
.tool-card .tool-icon svg {
  width: 22px;
  height: 22px;
}
.tool-card[data-group="office"] .tool-icon {
  background: color-mix(in srgb, var(--success) 16%, transparent);
  color: var(--success);
}
.tool-card h3 {
  margin: 0;
  font-size: 0.98rem;
  font-weight: 700;
}
.tool-card p {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ===================== Workspace ===================== */
.workspace {
  padding: 10px 0 90px;
}
.tool-panel {
  display: none;
}
.tool-panel.active {
  display: block;
}
.workspace-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 28px;
  max-width: 900px;
  margin: 0 auto;
}
@media (max-width: 600px) {
  .workspace-panel {
    padding: 18px;
    border-radius: var(--radius);
  }
}
.workspace-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 22px;
}
.back-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  cursor: pointer;
  flex: none;
  color: var(--text);
}
.back-btn:hover {
  background: var(--surface-2);
}
.back-btn svg {
  width: 18px;
  height: 18px;
}
.workspace-head h2 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 800;
}
.workspace-head p {
  margin: 2px 0 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Drop zone */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 36px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
  background: var(--surface-2);
}
.dropzone.dragover {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.dropzone svg {
  width: 34px;
  height: 34px;
  color: var(--accent);
  margin: 0 auto 10px;
}
.dropzone strong {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 4px;
}
.dropzone span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* File list */
.file-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.file-row {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
}
.file-row .file-icon {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  flex: none;
}
.file-row .file-icon svg {
  width: 16px;
  height: 16px;
}
.file-row .file-meta {
  flex: 1;
  min-width: 0;
}
.file-row .file-name {
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.file-row .file-size {
  font-size: 0.75rem;
  color: var(--text-muted);
}
.file-row .file-remove {
  border: none;
  background: none;
  color: var(--text-faint);
  cursor: pointer;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex: none;
}
.file-row .file-remove:hover {
  background: var(--danger-soft);
  color: var(--danger);
}
.file-row .file-remove svg {
  width: 15px;
  height: 15px;
}
.file-row.draggable {
  cursor: grab;
}
.file-row.dragging {
  opacity: 0.5;
}

/* Options / form controls */
.option-group {
  margin-top: 20px;
}
.option-group > label,
.field-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}
.radio-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.radio-row label,
.pill-option {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  cursor: pointer;
  background: var(--surface);
  transition: all 0.12s ease;
}
.radio-row input {
  accent-color: var(--accent);
}
.radio-row label:has(input:checked),
.pill-option.active {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-weight: 600;
}

.text-input,
select.text-input {
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 0.9rem;
}
.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
}
.checkbox-row input {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
}
.hint {
  font-size: 0.78rem;
  color: var(--text-faint);
  margin-top: 6px;
}
.notice {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  margin-top: 16px;
}
.notice svg {
  width: 16px;
  height: 16px;
  flex: none;
  margin-top: 1px;
  color: var(--accent);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  border-radius: 10px;
  padding: 12px 22px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.1s ease, filter 0.15s ease, opacity 0.15s ease;
}
.btn:active {
  transform: scale(0.98);
}
.btn svg {
  width: 17px;
  height: 17px;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  filter: brightness(1.08);
}
.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.btn-ghost {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  background: var(--surface);
}
.btn-row {
  display: flex;
  gap: 10px;
  margin-top: 24px;
  flex-wrap: wrap;
}

/* Page thumbnail grid (rotate/delete/rearrange/extract) */
.page-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 14px;
  margin-top: 18px;
}
.page-thumb {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  padding: 8px;
  cursor: grab;
  user-select: none;
  transition: box-shadow 0.15s ease, border-color 0.15s;
}
.page-thumb.dragging {
  opacity: 0.4;
}
.page-thumb.marked {
  border-color: var(--danger);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--danger) 30%, transparent);
}
.page-thumb.marked .thumb-canvas-wrap {
  opacity: 0.35;
}
.page-thumb.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 30%, transparent);
}
.thumb-canvas-wrap {
  overflow: hidden;
  border-radius: 6px;
  background: var(--surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 3/4;
}
.thumb-canvas-wrap canvas {
  max-width: 100%;
  max-height: 100%;
  transition: transform 0.15s ease;
}
.thumb-canvas-wrap.no-clip {
  overflow: visible;
  aspect-ratio: auto;
  min-height: 150px;
}
.thumb-canvas-wrap.no-clip canvas {
  max-width: 85%;
  max-height: 150px;
}
.page-thumb .page-num {
  text-align: center;
  font-size: 0.72rem;
  font-weight: 700;
  margin-top: 6px;
  color: var(--text-muted);
}
.thumb-actions {
  position: absolute;
  top: 12px;
  right: 12px;
  display: flex;
  gap: 4px;
}
.thumb-btn {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  border: none;
  background: rgba(20, 22, 40, 0.55);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
.thumb-btn svg {
  width: 13px;
  height: 13px;
}
.thumb-btn:hover {
  background: var(--accent);
}
.thumb-select {
  position: absolute;
  top: 12px;
  left: 12px;
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}
.page-grid-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 18px;
  flex-wrap: wrap;
  gap: 10px;
}
.link-btn {
  border: none;
  background: none;
  color: var(--accent);
  font-weight: 700;
  font-size: 0.82rem;
  cursor: pointer;
  padding: 0;
}

/* Progress / result */
.progress-wrap {
  margin-top: 20px;
}
.progress-bar {
  height: 8px;
  border-radius: 999px;
  background: var(--surface-2);
  overflow: hidden;
}
.progress-bar > div {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 0.2s ease;
}
.progress-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 6px;
}
.result-box {
  margin-top: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  background: var(--surface-2);
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.result-box .result-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--success) 16%, transparent);
  color: var(--success);
  display: flex;
  align-items: center;
  justify-content: center;
  flex: none;
}
.result-box .result-icon svg {
  width: 22px;
  height: 22px;
}
.result-box .result-text {
  flex: 1;
  min-width: 160px;
}
.result-box strong {
  display: block;
  font-size: 0.92rem;
}
.result-box span {
  font-size: 0.78rem;
  color: var(--text-muted);
}
.error-box {
  margin-top: 20px;
  border: 1px solid color-mix(in srgb, var(--danger) 40%, var(--border));
  background: var(--danger-soft);
  color: var(--danger);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 0.85rem;
  display: flex;
  gap: 8px;
}
.error-box svg {
  width: 16px;
  height: 16px;
  flex: none;
  margin-top: 1px;
}

.spinner {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: #fff;
  animation: spin 0.7s linear infinite;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 30px 0;
  text-align: center;
  color: var(--text-faint);
  font-size: 0.8rem;
}
.site-footer img {
  height: 20px;
  margin: 0 auto 10px;
  opacity: 0.7;
}
:root[data-theme="dark"] .site-footer img {
  filter: invert(1) brightness(1.9);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .site-footer img {
    filter: invert(1) brightness(1.9);
  }
}

/* Offscreen render sandbox used for office conversions */
.render-sandbox {
  position: fixed;
  left: -10000px;
  top: 0;
  width: 794px;
  background: #ffffff;
  color: #111111;
}