/* =========================================================================
 * DOC-FUTURE Converter
 * 製品サイト (kensaki-vn.com/doc-future/) のデザイントークンに合わせている。
 * 外部フォント / CDN には一切依存しない。
 * ========================================================================= */

:root {
  --ph-text: #0f172a;
  --ph-muted: #64748b;
  --ph-line: #e2e8f0;
  --ph-bg: #ffffff;
  --ph-bg-soft: #f8fafc;
  --ph-bg-tint: #eef2ff;
  --ph-primary: #4f46e5; /* indigo-600 */
  --ph-primary-d: #4338ca; /* indigo-700 */
  --ph-primary-l: #c7d2fe;
  --ph-accent: #06b6d4; /* cyan-500 */
  --ph-success: #10b981;
  --ph-warn: #f59e0b;
  --ph-danger: #ef4444;
  --ph-pad-x: 24px;
  --ph-max-w: 1200px;
  --ph-radius: 12px;
  --ph-radius-sm: 8px;
  --ph-code-bg: #0f172a;
  --ph-code-text: #e2e8f0;

  /*
   * Keep Latin/Vietnamese text on the platform UI font. Japanese proportional
   * alternates can otherwise be applied to Vietnamese glyphs and displace
   * tone marks in some browser/font combinations.
   */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-sans-ja: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Helvetica Neue",
    "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  --font-mono: "Cascadia Mono", Consolas, "SF Mono", Menlo, "Courier New",
    "Hiragino Sans", monospace;
}

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

/* display を指定した要素でも hidden 属性が効くようにする */
[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  color: var(--ph-text);
  background: var(--ph-bg);
}

html:lang(ja) body {
  font-family: var(--font-sans-ja);
  font-feature-settings: "palt";
}

html:lang(vi) body {
  font-feature-settings: normal;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

button {
  font: inherit;
  cursor: pointer;
  border: 0;
  background: transparent;
  color: inherit;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: 0.02em;
}

p {
  margin: 0 0 1em;
}

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

.container {
  max-width: var(--ph-max-w);
  margin: 0 auto;
  padding: 0 var(--ph-pad-x);
}

.container--narrow {
  max-width: 820px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ph-primary);
  color: #fff;
  padding: 10px 16px;
  z-index: 200;
}
.skip-link:focus {
  left: 0;
}

/* ---------------------------------------------------------- ヘッダー */
.ph-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--ph-line);
}

.ph-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 68px;
}

.ph-logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  letter-spacing: 0.15em;
}
.ph-logo__mark {
  color: var(--ph-primary);
  font-size: 18px;
}
.ph-logo__text {
  font-size: 16px;
}

.ph-nav {
  display: flex;
  gap: 28px;
  align-items: center;
}
.ph-nav a {
  font-size: 14px;
  font-weight: 600;
}
.ph-nav a:hover {
  color: var(--ph-primary);
}

.ph-header__actions {
  display: flex;
  gap: 10px;
  align-items: center;
}
.language-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 36px;
  padding: 6px 12px;
  border: 1px solid var(--ph-line);
  border-radius: 999px;
  background: #fff;
  color: var(--ph-text);
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}
.language-toggle:hover {
  border-color: var(--ph-primary);
  background: var(--ph-bg-tint);
  color: var(--ph-primary);
}
.language-toggle__icon {
  font-size: 14px;
}
.language-toggle__label {
  min-width: 1.5em;
  text-align: center;
}
.ph-link-back {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ph-muted);
}
.ph-link-back:hover {
  color: var(--ph-text);
}

@media (max-width: 860px) {
  .ph-nav {
    display: none;
  }
}

@media (max-width: 560px) {
  .ph-header__inner {
    gap: 12px;
  }
  .ph-header__actions {
    gap: 6px;
  }
  .ph-link-back {
    display: none;
  }
  .language-toggle {
    padding-inline: 10px;
  }
}

/* ---------------------------------------------------------- ボタン */
.ph-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.03em;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease,
    border-color 0.2s ease, color 0.2s ease;
}
.ph-btn--primary {
  background: var(--ph-primary);
  color: #fff;
  box-shadow: 0 8px 20px -8px rgba(79, 70, 229, 0.6);
}
.ph-btn--primary:hover:not(:disabled) {
  background: var(--ph-primary-d);
  transform: translateY(-1px);
}
.ph-btn--ghost {
  background: #fff;
  color: var(--ph-text);
  border: 1px solid var(--ph-line);
}
.ph-btn--ghost:hover:not(:disabled) {
  border-color: var(--ph-primary);
  color: var(--ph-primary);
}
.ph-btn--sm {
  padding: 8px 16px;
  font-size: 13px;
}
.ph-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
}

.linkish {
  font-size: 13px;
  color: var(--ph-muted);
  text-decoration: underline;
  padding: 4px;
}
.linkish:hover {
  color: var(--ph-danger);
}

/* ---------------------------------------------------------- セクション */
.ph-section {
  padding: 88px 0;
}
.ph-section--soft {
  background: var(--ph-bg-soft);
}
.ph-section--tint {
  background: linear-gradient(180deg, #eef2ff 0%, #f8fafc 100%);
}

.ph-section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}
.ph-eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--ph-primary);
  margin-bottom: 14px;
}
.ph-h2 {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  margin: 0 0 12px;
}

/* ---------------------------------------------------------- ヒーロー */
.hero {
  padding: 72px 0 56px;
}
.hero__inner {
  text-align: center;
}
.hero__title {
  font-size: clamp(28px, 4.4vw, 46px);
  font-weight: 800;
  letter-spacing: 0.01em;
  margin-bottom: 20px;
}
.hero__accent {
  color: var(--ph-primary);
}
.hero__lead {
  max-width: 640px;
  margin: 0 auto 24px;
  color: var(--ph-muted);
  font-size: 16px;
}
.hero__badges {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}
.hero__badges li {
  background: #fff;
  border: 1px solid var(--ph-primary-l);
  color: var(--ph-primary-d);
  border-radius: 999px;
  padding: 7px 16px;
  font-size: 13px;
  font-weight: 600;
}

/* ---------------------------------------------------------- 変換エリア */
.converter {
  padding-top: 48px;
}

.dropzone {
  border: 2px dashed var(--ph-primary-l);
  border-radius: 20px;
  background: var(--ph-bg-soft);
  padding: 56px 24px;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.dropzone:hover,
.dropzone:focus-visible {
  border-color: var(--ph-primary);
  background: var(--ph-bg-tint);
}
.dropzone.is-dragging {
  border-color: var(--ph-primary);
  background: var(--ph-bg-tint);
  transform: scale(1.006);
}
.dropzone__icon {
  color: var(--ph-primary);
  margin-bottom: 12px;
}
.dropzone__icon svg {
  display: inline-block;
}
.dropzone__title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 6px;
}
.dropzone__hint {
  color: var(--ph-muted);
  font-size: 13px;
  margin: 0;
}

/* ---------------------------------------------------------- オプション */
.options {
  margin-top: 20px;
  border: 1px solid var(--ph-line);
  border-radius: var(--ph-radius);
  background: #fff;
}
.options__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 20px;
  cursor: pointer;
  font-weight: 700;
  font-size: 14px;
  list-style: none;
}
.options__summary::-webkit-details-marker {
  display: none;
}
.options__summary::before {
  content: "▸";
  color: var(--ph-primary);
  transition: transform 0.2s ease;
}
.options[open] .options__summary::before {
  transform: rotate(90deg);
}
.options__hint {
  font-weight: 400;
  font-size: 12px;
  color: var(--ph-muted);
}
.options__body {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  padding: 4px 20px 20px;
  border-top: 1px solid var(--ph-line);
}
.options__group {
  border: 0;
  padding: 16px 0 0;
  margin: 0;
  min-width: 0;
}
.options__group legend {
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ph-primary);
  font-weight: 700;
  padding: 0;
}
.check {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 13.5px;
  padding: 5px 0;
  cursor: pointer;
}
.check input {
  margin: 4px 0 0;
  accent-color: var(--ph-primary);
  flex: none;
}
.field {
  display: block;
  padding: 8px 0 0;
}
.field__label {
  display: block;
  font-size: 13.5px;
  margin-bottom: 6px;
}
.field select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--ph-line);
  border-radius: var(--ph-radius-sm);
  background: #fff;
  font: inherit;
  font-size: 13.5px;
}

/* ---------------------------------------------------------- 作業エリア */
.workspace {
  display: grid;
  grid-template-columns: minmax(280px, 360px) 1fr;
  gap: 24px;
  margin-top: 28px;
  align-items: start;
}
@media (max-width: 980px) {
  .workspace {
    grid-template-columns: 1fr;
  }
}

.workspace__list-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
.workspace__heading {
  font-size: 13px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ph-muted);
}

.filelist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.fileitem {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  text-align: left;
  padding: 12px 14px;
  border: 1px solid var(--ph-line);
  border-radius: var(--ph-radius);
  background: #fff;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.fileitem:hover {
  border-color: var(--ph-primary-l);
}
.fileitem.is-selected {
  border-color: var(--ph-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}
.fileitem__button {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 0;
  text-align: left;
}
.fileitem__badge {
  flex: none;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: #fff;
  background: var(--ph-muted);
}
.fileitem__badge[data-kind="word"] {
  background: #2b579a;
}
.fileitem__badge[data-kind="excel"] {
  background: #217346;
}
.fileitem__badge[data-kind="powerpoint"] {
  background: #c43e1c;
}
.fileitem__body {
  min-width: 0;
  flex: 1;
}
.fileitem__name {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.fileitem__meta {
  display: block;
  font-size: 11.5px;
  color: var(--ph-muted);
}
.fileitem__meta[data-state="error"] {
  color: var(--ph-danger);
}
.fileitem__meta[data-state="warning"] {
  color: #b45309;
}
.fileitem__remove {
  flex: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  color: var(--ph-muted);
  font-size: 16px;
  line-height: 1;
  display: grid;
  place-items: center;
}
.fileitem__remove:hover {
  background: #fee2e2;
  color: var(--ph-danger);
}

.spinner {
  width: 14px;
  height: 14px;
  border: 2px solid var(--ph-primary-l);
  border-top-color: var(--ph-primary);
  border-radius: 50%;
  display: inline-block;
  vertical-align: -2px;
  animation: spin 0.7s linear infinite;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}
@media (prefers-reduced-motion: reduce) {
  .spinner {
    animation-duration: 2s;
  }
  html {
    scroll-behavior: auto;
  }
}

.bulk {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
}

/* ---------------------------------------------------------- プレビュー */
.workspace__preview {
  border: 1px solid var(--ph-line);
  border-radius: var(--ph-radius);
  background: #fff;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.preview__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--ph-line);
  background: var(--ph-bg-soft);
  flex-wrap: wrap;
}
.tabs {
  display: flex;
  gap: 4px;
  background: #fff;
  border: 1px solid var(--ph-line);
  border-radius: 999px;
  padding: 3px;
}
.tab {
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--ph-muted);
}
.tab.is-active {
  background: var(--ph-primary);
  color: #fff;
}
.preview__actions {
  display: flex;
  gap: 8px;
}

.preview__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  padding: 10px 16px;
  font-size: 12px;
  color: var(--ph-muted);
  border-bottom: 1px solid var(--ph-line);
}
.preview__meta strong {
  color: var(--ph-text);
  font-weight: 700;
}

.preview__warnings {
  padding: 12px 16px;
  background: #fffbeb;
  border-bottom: 1px solid #fde68a;
  font-size: 12.5px;
  color: #92400e;
}
.preview__warnings ul {
  margin: 0;
  padding-left: 18px;
}

.preview__source {
  margin: 0;
  padding: 20px;
  background: var(--ph-code-bg);
  color: var(--ph-code-text);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.75;
  white-space: pre-wrap;
  word-break: break-word;
  overflow: auto;
  max-height: 640px;
  min-height: 320px;
  tab-size: 4;
}

.preview__rendered {
  padding: 24px 28px;
  overflow: auto;
  max-height: 640px;
  min-height: 320px;
}

/* 変換結果のプレビュー本文 */
.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  margin: 1.6em 0 0.6em;
  line-height: 1.4;
}
.markdown-body > :first-child {
  margin-top: 0;
}
.markdown-body h1 {
  font-size: 26px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--ph-line);
}
.markdown-body h2 {
  font-size: 21px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--ph-line);
}
.markdown-body h3 {
  font-size: 17px;
}
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  font-size: 15px;
}
.markdown-body p {
  margin: 0 0 1em;
}
.markdown-body ul,
.markdown-body ol {
  margin: 0 0 1em;
  padding-left: 1.6em;
}
.markdown-body li {
  margin-bottom: 0.25em;
}
.markdown-body li > ul,
.markdown-body li > ol {
  margin: 0.25em 0 0;
}
.markdown-body a {
  color: var(--ph-primary);
  text-decoration: underline;
}
.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--ph-bg-tint);
  color: var(--ph-primary-d);
  padding: 2px 5px;
  border-radius: 5px;
}
.markdown-body pre {
  background: var(--ph-code-bg);
  color: var(--ph-code-text);
  padding: 14px 16px;
  border-radius: var(--ph-radius-sm);
  overflow: auto;
  font-size: 12.5px;
}
.markdown-body pre code {
  background: none;
  color: inherit;
  padding: 0;
}
.markdown-body .md-frontmatter {
  background: var(--ph-bg-soft);
  color: var(--ph-muted);
  border: 1px dashed var(--ph-line);
  font-size: 12px;
}
.markdown-body blockquote {
  margin: 0 0 1em;
  padding: 2px 16px;
  border-left: 3px solid var(--ph-primary-l);
  color: var(--ph-muted);
  background: var(--ph-bg-soft);
  border-radius: 0 var(--ph-radius-sm) var(--ph-radius-sm) 0;
}
.markdown-body blockquote p:last-child {
  margin-bottom: 0;
}
.markdown-body hr {
  border: 0;
  border-top: 1px solid var(--ph-line);
  margin: 2em 0;
}
.md-table-wrap {
  overflow-x: auto;
  margin: 0 0 1em;
}
.markdown-body table {
  border-collapse: collapse;
  font-size: 13px;
  min-width: 100%;
}
.markdown-body th,
.markdown-body td {
  border: 1px solid var(--ph-line);
  padding: 7px 12px;
  text-align: left;
  vertical-align: top;
}
.markdown-body th {
  background: var(--ph-bg-soft);
  font-weight: 700;
  white-space: nowrap;
}
.markdown-body img {
  border-radius: var(--ph-radius-sm);
  border: 1px solid var(--ph-line);
}
.md-missing {
  color: var(--ph-muted);
  font-size: 12px;
  background: var(--ph-bg-soft);
  padding: 2px 6px;
  border-radius: 4px;
}

.status {
  margin: 20px 0 0;
  font-size: 13px;
  color: var(--ph-muted);
  text-align: center;
  min-height: 1.4em;
}
.status[data-tone="error"] {
  color: var(--ph-danger);
  font-weight: 600;
}
.status[data-tone="success"] {
  color: var(--ph-success);
  font-weight: 600;
}

/* ---------------------------------------------------------- 使い方 */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.step {
  background: #fff;
  border: 1px solid var(--ph-line);
  border-radius: var(--ph-radius);
  padding: 28px 24px;
}
.step__number {
  display: inline-block;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.2em;
  color: var(--ph-primary);
  margin-bottom: 10px;
}
.step__title {
  font-size: 17px;
  margin-bottom: 8px;
}
.step__text {
  margin: 0;
  color: var(--ph-muted);
  font-size: 14px;
}

/* ---------------------------------------------------------- FAQ */
.faq {
  border-bottom: 1px solid var(--ph-line);
  padding: 4px 0;
}
.faq summary {
  padding: 16px 4px;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  list-style: none;
  display: flex;
  gap: 12px;
  align-items: baseline;
}
.faq summary::-webkit-details-marker {
  display: none;
}
.faq summary::before {
  content: "Q";
  color: var(--ph-primary);
  font-weight: 800;
  font-size: 13px;
}
.faq p {
  margin: 0 0 16px;
  padding-left: 24px;
  color: var(--ph-muted);
  font-size: 14px;
}
.faq code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--ph-bg-tint);
  color: var(--ph-primary-d);
  padding: 1px 5px;
  border-radius: 4px;
}

/* ---------------------------------------------------------- フッター */
.site-footer {
  background: #0f172a;
  color: #cbd5e1;
  padding: 48px 0 24px;
}
.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: space-between;
  align-items: flex-start;
}
.site-footer .ph-logo {
  color: #fff;
}
.site-footer__note {
  font-size: 13px;
  color: #94a3b8;
  margin: 10px 0 0;
}
.site-footer__links {
  display: flex;
  gap: 24px;
  font-size: 13px;
}
.site-footer__links a:hover {
  color: #fff;
}
.site-footer__copy {
  text-align: center;
  font-size: 12px;
  color: #64748b;
  margin: 32px 0 0;
}

.noscript {
  padding: 16px;
  background: #fef3c7;
  color: #92400e;
  text-align: center;
  margin: 0;
}