:root {
  color-scheme: dark;
  --bg: #0d0f11;
  --surface: #15191c;
  --surface-strong: #1b2024;
  --border: #30363b;
  --border-soft: #242a2e;
  --text: #f2f4f5;
  --muted: #a4adb3;
  --green: #55d6aa;
  --green-deep: #153e33;
  --amber: #f4bd5b;
  --danger: #ff8585;
  --shadow: 0 16px 42px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; background: var(--bg); color: var(--text); font-family: Inter, "Noto Sans JP", "Yu Gothic UI", Meiryo, sans-serif; line-height: 1.65; letter-spacing: 0; }
a { color: inherit; }
button, input, select { font: inherit; letter-spacing: 0; }
button, a, label { -webkit-tap-highlight-color: transparent; }
button, label { touch-action: manipulation; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.site-header { position: sticky; top: 0; z-index: 30; border-bottom: 1px solid var(--border-soft); background: rgba(13, 15, 17, 0.96); backdrop-filter: blur(12px); }
.header-inner, .page-shell, .footer-inner { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.header-inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; min-width: 0; }
.brand-mark { width: 40px; height: 40px; flex: 0 0 auto; display: grid; place-items: center; border: 1px solid #397a68; border-radius: 7px; background: #10221d; color: var(--green); font-size: .8rem; font-weight: 850; }
.brand-copy { display: grid; line-height: 1.18; }
.brand-copy strong { font-size: 1rem; }
.brand-copy small { color: var(--muted); font-size: .7rem; }
.site-nav { display: flex; gap: 19px; align-items: center; font-size: .86rem; }
.site-nav a { color: #c5cbd0; text-decoration-color: #4b555c; text-underline-offset: 5px; }
.site-nav a:hover, .site-nav a:focus-visible { color: var(--green); }

.page-shell { padding: 38px 0 80px; }
.page-intro { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 28px; padding-bottom: 26px; border-bottom: 1px solid var(--border); }
.eyebrow { margin: 0 0 7px; color: var(--green); font-size: .74rem; font-weight: 850; }
h1, h2, h3, p { margin-top: 0; }
.page-intro h1 { margin-bottom: 8px; font-size: clamp(1.9rem, 5vw, 3rem); line-height: 1.18; }
.page-intro p:last-child { margin-bottom: 0; color: var(--muted); }
.privacy-signal { min-width: 166px; display: flex; align-items: center; gap: 12px; padding: 12px 0 12px 16px; border-left: 3px solid var(--green); }
.privacy-signal svg { width: 25px; color: var(--green); }
.privacy-signal span { display: grid; }
.privacy-signal small { color: var(--muted); }

.tool-layout { display: grid; grid-template-columns: minmax(0, 760px) minmax(240px, 1fr); gap: 44px; align-items: start; padding: 34px 0 50px; }
.converter-frame { padding: 28px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); box-shadow: var(--shadow); }
.tool-heading { display: flex; align-items: flex-start; gap: 13px; margin-bottom: 18px; }
.tool-heading.compact { margin: 0 0 14px; }
.step-number { width: 30px; height: 30px; flex: 0 0 auto; display: grid; place-items: center; border-radius: 6px; background: var(--green-deep); color: var(--green); font-weight: 800; }
.tool-heading h2 { margin-bottom: 2px; font-size: 1.12rem; }
.tool-heading p { margin: 0; color: var(--muted); font-size: .86rem; }
.drop-zone { min-height: 176px; display: grid; place-items: center; align-content: center; gap: 5px; padding: 24px; border: 1px dashed #536068; border-radius: 7px; background: #111517; text-align: center; cursor: pointer; transition: border-color .18s ease, background .18s ease; }
.drop-zone:hover, .drop-zone:focus-visible, .drop-zone.is-dragging { outline: 0; border-color: var(--green); background: #10201b; }
.drop-zone svg { width: 31px; height: 31px; margin-bottom: 5px; color: var(--green); }
.drop-zone span, .drop-zone small { color: var(--muted); }
.drop-zone small { margin-top: 4px; font-size: .76rem; }
.file-summary { display: grid; grid-template-columns: 42px minmax(0, 1fr) 40px; gap: 12px; align-items: center; min-height: 72px; padding: 12px; border: 1px solid var(--border); border-radius: 7px; background: #111517; }
.file-icon { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 6px; background: var(--green-deep); color: var(--green); }
.file-copy { min-width: 0; display: grid; }
.file-copy strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-copy span { color: var(--muted); font-size: .8rem; }
.icon-button { width: 40px; height: 40px; display: grid; place-items: center; border: 0; border-radius: 6px; background: transparent; color: var(--muted); cursor: pointer; }
.icon-button:hover, .icon-button:focus-visible { background: var(--surface-strong); color: var(--text); }
.tool-step { margin-top: 28px; padding-top: 24px; border-top: 1px solid var(--border-soft); }
.tool-tabs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 4px; margin-bottom: 12px; padding: 4px; border: 1px solid var(--border); border-radius: 7px; background: #0f1214; }
.tool-tab { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: 7px; border: 0; border-radius: 5px; background: transparent; color: var(--muted); font-weight: 800; cursor: pointer; }
.tool-tab svg { width: 18px; }
.tool-tab:hover, .tool-tab:focus-visible { color: var(--text); background: #1a2023; }
.tool-tab.is-active { background: var(--green-deep); color: var(--green); }
.tool-tab:disabled { color: #5f686d; cursor: not-allowed; opacity: .62; }
.preset-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; }
.preset-option { min-height: 68px; display: grid; grid-template-columns: 24px minmax(0, 1fr); align-items: center; gap: 11px; padding: 11px 13px; border: 1px solid var(--border); border-radius: 7px; background: #111517; cursor: pointer; }
.preset-option input { position: absolute; opacity: 0; pointer-events: none; }
.preset-option svg { width: 22px; color: var(--muted); }
.preset-option span { display: grid; }
.preset-option small { color: var(--muted); font-size: .74rem; }
.preset-option:hover, .preset-option:focus-within { border-color: #536068; }
.preset-option.is-selected { border-color: #3e8f78; background: #10201b; }
.preset-option.is-selected svg, .preset-option.is-selected strong { color: var(--green); }
.trim-option { margin-top: 14px; padding: 14px; border: 1px solid var(--border-soft); border-radius: 7px; background: #111517; }
.trim-option .check-row { font-size: .86rem; }
.trim-fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-top: 13px; }
.trim-fields label { display: grid; gap: 5px; color: var(--muted); font-size: .76rem; font-weight: 700; }
.trim-fields input { width: 100%; min-height: 42px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px; outline: 0; background: #0d1012; color: var(--text); }
.trim-fields input:focus { border-color: var(--green); }
.agreement-box { margin-top: 22px; padding: 16px 0 0; border-top: 1px solid var(--border-soft); }
.check-row { display: grid; grid-template-columns: 22px minmax(0, 1fr); gap: 10px; align-items: start; font-weight: 700; cursor: pointer; }
.check-row input { width: 20px; height: 20px; margin: 2px 0 0; accent-color: var(--green); }
.agreement-box p { margin: 8px 0 0 32px; color: var(--muted); font-size: .76rem; }
.agreement-box a { color: var(--green); text-underline-offset: 3px; }
.action-row { display: flex; gap: 10px; margin-top: 20px; }
.primary-button, .secondary-button, .download-button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; padding: 0 20px; border-radius: 7px; font-weight: 800; cursor: pointer; text-decoration: none; }
.primary-button { flex: 1; border: 1px solid #6ce7bc; background: var(--green); color: #092019; }
.primary-button:disabled { border-color: var(--border); background: #293035; color: #707a80; cursor: not-allowed; }
.secondary-button { border: 1px solid var(--border); background: transparent; color: var(--text); }
.primary-button svg, .secondary-button svg, .download-button svg { width: 19px; }
.progress-panel, .result-panel, .error-panel { margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--border); }
.progress-copy { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.progress-copy span { color: var(--green); font-weight: 800; }
.progress-track { height: 8px; margin-top: 10px; overflow: hidden; border-radius: 4px; background: #262d31; }
.progress-track span { display: block; width: 0; height: 100%; background: var(--green); transition: width .2s ease; }
.progress-panel p { margin: 8px 0 0; color: var(--muted); font-size: .78rem; }
.result-panel { display: grid; grid-template-columns: 40px minmax(0, 1fr) auto; gap: 12px; align-items: center; }
.result-icon { width: 40px; height: 40px; display: grid; place-items: center; color: var(--green); }
.result-panel p { margin: 1px 0 0; color: var(--muted); font-size: .78rem; }
.download-button { min-height: 44px; background: var(--amber); color: #201702; }
.error-panel { grid-template-columns: 28px minmax(0, 1fr); gap: 10px; color: var(--danger); }
.error-panel:not([hidden]) { display: grid; }
.error-panel p { margin: 2px 0 0; color: #d7a6a6; font-size: .8rem; }

.tool-aside { display: grid; gap: 0; }
.aside-section { display: grid; grid-template-columns: 28px minmax(0, 1fr); gap: 12px; padding: 18px 0; border-bottom: 1px solid var(--border-soft); }
.aside-section:first-child { padding-top: 4px; }
.aside-section svg { width: 23px; color: var(--green); }
.aside-section h2 { margin-bottom: 4px; font-size: .96rem; }
.aside-section p { margin: 0; color: var(--muted); font-size: .82rem; }
.text-link { display: inline-flex; align-items: center; gap: 8px; margin-top: 18px; color: var(--green); font-size: .84rem; font-weight: 700; text-underline-offset: 4px; }
.text-link svg { width: 17px; }

.network-links { display: grid; grid-template-columns: minmax(0, 1fr) minmax(360px, .8fr); gap: 40px; align-items: center; padding: 36px 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.network-links h2 { margin-bottom: 6px; font-size: 1.35rem; }
.network-links p:last-child { margin-bottom: 0; color: var(--muted); }
.network-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.network-actions a { min-height: 70px; display: grid; grid-template-columns: 26px minmax(0, 1fr); align-items: center; gap: 11px; padding: 12px; border: 1px solid var(--border); border-radius: 7px; background: var(--surface); text-decoration: none; }
.network-actions a:hover, .network-actions a:focus-visible { border-color: var(--green); }
.network-actions svg { color: var(--amber); }
.network-actions span { display: grid; }
.network-actions small { color: var(--muted); font-size: .7rem; }

.tool-directory { padding: 38px 0 8px; }
.tool-directory h2 { margin-bottom: 6px; font-size: 1.35rem; }
.tool-directory > div > p:last-child { color: var(--muted); }
.directory-links { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin-top: 18px; }
.directory-links a { min-height: 68px; display: grid; grid-template-columns: 25px minmax(0, 1fr); align-items: center; gap: 10px; padding: 11px 12px; border: 1px solid var(--border); border-radius: 7px; background: var(--surface); text-decoration: none; }
.directory-links a:hover, .directory-links a:focus-visible { border-color: var(--green); }
.directory-links svg { width: 21px; color: var(--green); }
.directory-links span { min-width: 0; display: grid; }
.directory-links small { color: var(--muted); font-size: .7rem; }

.guide-shell { width: min(920px, calc(100% - 40px)); margin: 0 auto; padding: 42px 0 80px; }
.guide-hero { padding-bottom: 28px; border-bottom: 1px solid var(--border); }
.guide-hero h1 { max-width: 760px; margin-bottom: 10px; font-size: clamp(1.85rem, 5vw, 2.75rem); line-height: 1.22; }
.guide-hero > p:last-of-type { max-width: 720px; color: var(--muted); }
.guide-action { min-height: 50px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; margin-top: 8px; padding: 0 20px; border-radius: 7px; background: var(--green); color: #092019; font-weight: 850; text-decoration: none; }
.guide-action svg { width: 19px; }
.guide-band { display: grid; grid-template-columns: 210px minmax(0, 1fr); gap: 34px; padding: 32px 0; border-bottom: 1px solid var(--border-soft); }
.guide-band h2 { margin-bottom: 0; font-size: 1.08rem; }
.guide-band p:last-child { margin-bottom: 0; }
.guide-band ol, .guide-band ul { margin: 0; padding-left: 1.25rem; }
.guide-band li { margin-bottom: 8px; color: #c8cfd3; }
.guide-band li:last-child { margin-bottom: 0; }
.guide-faq { display: grid; gap: 18px; }
.guide-faq h3 { margin: 0 0 5px; font-size: .95rem; }
.guide-faq p { color: var(--muted); }
.guide-back { display: inline-flex; align-items: center; gap: 7px; margin-top: 26px; color: var(--green); font-weight: 700; text-underline-offset: 4px; }
.guide-back svg { width: 17px; }

.legal-shell { width: min(820px, calc(100% - 40px)); margin: 0 auto; padding: 42px 0 80px; }
.legal-head { padding-bottom: 24px; border-bottom: 1px solid var(--border); }
.legal-head h1 { margin-bottom: 8px; font-size: clamp(1.8rem, 5vw, 2.6rem); }
.legal-head p:last-child { margin-bottom: 0; color: var(--muted); }
.legal-nav { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 0; }
.legal-nav a { padding: 7px 10px; border: 1px solid var(--border); border-radius: 6px; color: var(--muted); font-size: .78rem; text-decoration: none; }
.legal-content { padding-top: 28px; }
.legal-content section { padding: 0 0 25px; margin-bottom: 25px; border-bottom: 1px solid var(--border-soft); }
.legal-content h2 { margin-bottom: 9px; font-size: 1.15rem; }
.legal-content h3 { margin: 18px 0 6px; font-size: .95rem; }
.legal-content p, .legal-content li { color: #c4cbd0; font-size: .9rem; }
.legal-content ul, .legal-content ol { padding-left: 1.35rem; }
.legal-content .notice { padding: 15px; border-left: 3px solid var(--amber); background: #1b1a15; }
.legal-content .ok { border-left-color: var(--green); background: #10201b; }

.site-footer { border-top: 1px solid var(--border-soft); }
.footer-inner { min-height: 160px; display: grid; grid-template-columns: 1fr auto; gap: 20px; align-content: center; }
.footer-inner p { margin: 2px 0 0; color: var(--muted); font-size: .8rem; }
.footer-inner nav { display: flex; flex-wrap: wrap; gap: 16px; justify-content: flex-end; font-size: .78rem; }
.footer-inner nav a { color: var(--muted); text-underline-offset: 4px; }
.footer-inner > small { grid-column: 1 / -1; color: #747d82; }

[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--green); outline-offset: 3px; }

@media (max-width: 820px) {
  .tool-layout { grid-template-columns: 1fr; gap: 32px; }
  .tool-aside { grid-template-columns: 1fr; }
  .network-links { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .header-inner, .page-shell, .footer-inner, .legal-shell { width: min(100% - 28px, 1160px); }
  .header-inner { min-height: 62px; }
  .brand-copy small { display: none; }
  .site-nav { gap: 12px; font-size: .76rem; }
  .site-nav a:last-child { display: none; }
  .page-shell { padding-top: 25px; }
  .page-intro { grid-template-columns: 1fr; gap: 16px; align-items: start; }
  .page-intro h1 { font-size: 1.75rem; }
  .privacy-signal { min-width: 0; padding: 4px 0 4px 12px; }
  .tool-layout { padding-top: 24px; }
  .converter-frame { margin: 0 -4px; padding: 20px 16px; border-radius: 7px; }
  .drop-zone { min-height: 158px; padding: 18px 12px; }
  .drop-zone span { display: none; }
  .preset-grid { grid-template-columns: 1fr; }
  .preset-option { min-height: 62px; }
  .tool-tab { min-height: 46px; }
  .trim-fields { grid-template-columns: 1fr 1fr; }
  .agreement-box p { margin-left: 0; }
  .action-row { flex-direction: column; }
  .primary-button, .secondary-button { width: 100%; min-height: 52px; }
  .result-panel { grid-template-columns: 38px minmax(0, 1fr); }
  .download-button { grid-column: 1 / -1; min-height: 50px; margin-top: 4px; }
  .network-actions { grid-template-columns: 1fr; }
  .directory-links { grid-template-columns: 1fr; }
  .guide-shell { width: min(100% - 28px, 920px); padding-top: 28px; }
  .guide-band { grid-template-columns: 1fr; gap: 14px; padding: 26px 0; }
  .guide-action { width: 100%; }
  .footer-inner { grid-template-columns: 1fr; padding: 28px 0; }
  .footer-inner nav { justify-content: flex-start; }
  .footer-inner > small { grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}