:root {
  color-scheme: light;
  --ink: #16223a;
  --heading: #102749;
  --muted: #58677d;
  --muted-subtle: #748399;
  --line: #d9e0e9;
  --line-strong: #8794a5;
  --soft: #f4f7fb;
  --panel: #ffffff;
  --panel-raised: #ffffff;
  --input: #ffffff;
  --page: #f8fafc;
  --page-end: #ffffff;
  --header: rgba(255, 255, 255, .86);
  --footer: #f8fafc;
  --navy: var(--heading);
  --accent: #2463eb;
  --accent-hover: #1749b1;
  --accent-dark: #1749b1;
  --accent-soft: #edf4ff;
  --accent-line: #a7c4ff;
  --accent-ink: #16479e;
  --cyan: #24b4c6;
  --warning-bg: #fff7df;
  --warning-line: #e9c55f;
  --warning-ink: #63562f;
  --warning-strong: #75570c;
  --danger: #a83232;
  --danger-bg: #fff4f3;
  --danger-line: #e7bbbb;
  --danger-ink: #6f3636;
  --success: #176b51;
  --success-bg: #ebf8f3;
  --success-line: #9bd2be;
  --success-ink: #176b51;
  --review-bg: #fff7df;
  --review-line: #e0c467;
  --review-ink: #72570f;
  --focus: #5c7ed1;
  --button-shadow: 0 9px 24px rgba(36, 99, 235, .22);
  --shadow: 0 22px 65px rgba(21, 39, 73, .11);
  --success-shadow: 0 14px 36px rgba(23, 107, 81, .08);
  --warning-shadow: 0 16px 40px rgba(132, 99, 18, .08);
  --radius: 18px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --ink: #dbe5f1;
  --heading: #f4f7fb;
  --muted: #a9b7c9;
  --muted-subtle: #8394aa;
  --line: #2b3a4e;
  --line-strong: #58718e;
  --soft: #111b29;
  --panel: #152131;
  --panel-raised: #1a283a;
  --input: #0f1926;
  --page: #0d1420;
  --page-end: #101927;
  --header: rgba(13, 20, 32, .88);
  --footer: #101927;
  --accent: #4268b2;
  --accent-hover: #36599a;
  --accent-dark: #a9c0f5;
  --accent-soft: #1b2d4a;
  --accent-line: #3e5e91;
  --accent-ink: #c7d8ff;
  --cyan: #58b8c0;
  --warning-bg: #2b271b;
  --warning-line: #76652f;
  --warning-ink: #d8c78f;
  --warning-strong: #f0d98a;
  --danger: #dd8580;
  --danger-bg: #2d1d22;
  --danger-line: #75454b;
  --danger-ink: #efb4b1;
  --success: #77c3a7;
  --success-bg: #182b27;
  --success-line: #376a5b;
  --success-ink: #9bd8c2;
  --review-bg: #2b271b;
  --review-line: #76652f;
  --review-ink: #ecd68c;
  --focus: #7ea4ff;
  --button-shadow: 0 10px 28px rgba(5, 10, 20, .36);
  --shadow: 0 24px 70px rgba(0, 0, 0, .32);
  --success-shadow: 0 16px 38px rgba(0, 0, 0, .22);
  --warning-shadow: 0 16px 38px rgba(0, 0, 0, .20);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --ink: #dbe5f1;
    --heading: #f4f7fb;
    --muted: #a9b7c9;
    --muted-subtle: #8394aa;
    --line: #2b3a4e;
    --line-strong: #58718e;
    --soft: #111b29;
    --panel: #152131;
    --panel-raised: #1a283a;
    --input: #0f1926;
    --page: #0d1420;
    --page-end: #101927;
    --header: rgba(13, 20, 32, .88);
    --footer: #101927;
    --accent: #4268b2;
    --accent-hover: #36599a;
    --accent-dark: #a9c0f5;
    --accent-soft: #1b2d4a;
    --accent-line: #3e5e91;
    --accent-ink: #c7d8ff;
    --cyan: #58b8c0;
    --warning-bg: #2b271b;
    --warning-line: #76652f;
    --warning-ink: #d8c78f;
    --warning-strong: #f0d98a;
    --danger: #dd8580;
    --danger-bg: #2d1d22;
    --danger-line: #75454b;
    --danger-ink: #efb4b1;
    --success: #77c3a7;
    --success-bg: #182b27;
    --success-line: #376a5b;
    --success-ink: #9bd8c2;
    --review-bg: #2b271b;
    --review-line: #76652f;
    --review-ink: #ecd68c;
    --focus: #7ea4ff;
    --button-shadow: 0 10px 28px rgba(5, 10, 20, .36);
    --shadow: 0 24px 70px rgba(0, 0, 0, .32);
    --success-shadow: 0 16px 38px rgba(0, 0, 0, .22);
    --warning-shadow: 0 16px 38px rgba(0, 0, 0, .20);
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 0%, color-mix(in srgb, var(--cyan) 10%, transparent), transparent 30rem),
    linear-gradient(var(--page) 0, var(--page-end) 42rem);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}
button, input, select { font: inherit; }
a { color: inherit; }
.shell { width: min(1120px, calc(100% - 40px)); margin-inline: auto; }

.site-header {
  position: relative;
  z-index: 2;
  border-bottom: 1px solid var(--line);
  background: var(--header);
  backdrop-filter: blur(14px);
}
.header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.header-actions { display: flex; align-items: center; gap: 12px; }
.theme-control { display: inline-flex; align-items: center; gap: 7px; color: var(--muted); font-size: 12px; font-weight: 700; }
.theme-control select { width: auto; min-height: 34px; border-color: var(--line-strong); border-radius: 9px; padding: 5px 27px 5px 9px; color: var(--ink); background-color: var(--input); font-size: 12px; font-weight: 700; }
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--navy); font-weight: 760; text-decoration: none; letter-spacing: -.02em; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; color: white; background: linear-gradient(145deg, var(--accent), var(--cyan)); font-size: 12px; letter-spacing: .04em; }
.beta-badge, .state-badge { border: 1px solid var(--accent-line); border-radius: 999px; padding: 5px 10px; color: var(--accent-ink); background: var(--accent-soft); font-size: 12px; font-weight: 750; letter-spacing: .06em; text-transform: uppercase; }

.hero { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(280px, .75fr); gap: clamp(36px, 7vw, 84px); align-items: center; padding-block: clamp(68px, 10vw, 128px); }
.hero-copy { max-width: 750px; }
.eyebrow { margin: 0 0 10px; color: var(--accent-dark); font-size: 12px; font-weight: 800; letter-spacing: .11em; text-transform: uppercase; }
h1, h2, h3, h4, p { margin-top: 0; }
h1 { margin-bottom: 24px; max-width: 760px; color: var(--navy); font-size: clamp(44px, 6.7vw, 78px); line-height: .99; letter-spacing: -.055em; }
h2 { margin-bottom: 14px; color: var(--navy); font-size: clamp(30px, 4vw, 46px); line-height: 1.08; letter-spacing: -.035em; }
h3 { color: var(--navy); }
.hero-lead { max-width: 680px; margin-bottom: 32px; color: var(--muted); font-size: clamp(18px, 2vw, 22px); }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 20px; }
.button { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; border: 1px solid transparent; border-radius: 11px; padding: 10px 17px; font-weight: 740; text-decoration: none; cursor: pointer; transition: transform .15s ease, background .15s ease, border-color .15s ease; }
.button:hover { transform: translateY(-1px); }
.button:focus-visible, .text-link:focus-visible, input:focus-visible, select:focus-visible, summary:focus-visible, .drop-zone:focus-within { outline: 3px solid var(--focus); outline-offset: 3px; }
.button.primary { color: #fff; background: var(--accent); box-shadow: var(--button-shadow); }
.button.primary:hover { background: var(--accent-hover); }
.button.secondary { color: var(--heading); border-color: var(--line-strong); background: var(--panel-raised); box-shadow: 0 4px 12px rgba(0, 0, 0, .08); }
.button.secondary:hover { border-color: var(--accent); background: var(--accent-soft); }
.button:disabled { opacity: .72; cursor: wait; transform: none; filter: saturate(.72); }
.text-link { color: var(--accent-dark); font-weight: 720; text-underline-offset: 4px; }
.beta-warning { border: 1px solid var(--warning-line); border-radius: var(--radius); padding: 24px; background: var(--warning-bg); box-shadow: var(--warning-shadow); }
.beta-warning strong { display: block; margin-bottom: 8px; color: var(--warning-strong); font-size: 16px; }
.beta-warning p { margin: 0; color: var(--warning-ink); }

.principles { padding-block: 28px 92px; }
.section-heading { max-width: 760px; }
.principle-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 32px; }
.principle-grid article { border-top: 2px solid var(--accent); padding: 24px 18px 12px 0; }
.principle-grid article > span { color: var(--muted-subtle); font-size: 12px; font-weight: 780; letter-spacing: .1em; }
.principle-grid h3 { margin: 14px 0 8px; font-size: 18px; }
.principle-grid p { color: var(--muted); }

.converter-section { padding-block: 72px 100px; }
.converter-heading { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(250px, .65fr); gap: 40px; max-width: none; align-items: end; margin-bottom: 28px; }
.converter-heading > div:first-child > p:last-child { max-width: 680px; color: var(--muted); }
.route-note { border-left: 2px solid var(--cyan); padding-left: 18px; }
.route-note strong, .route-note span, .route-note small { display: block; }
.route-note span { margin: 3px 0 5px; font-weight: 700; }
.route-note small { color: var(--muted); }
.converter-card { border: 1px solid var(--line); border-radius: 22px; padding: clamp(22px, 4vw, 42px); background: var(--panel); box-shadow: var(--shadow); }
fieldset { min-width: 0; margin: 0; border: 0; padding: 0; }
fieldset + fieldset { margin-top: 34px; border-top: 1px solid var(--line); padding-top: 30px; }
legend { width: 100%; margin-bottom: 18px; padding: 0; color: var(--navy); font-size: 20px; font-weight: 780; }
.field-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.field { display: grid; gap: 7px; color: var(--navy); font-weight: 700; }
.full-width { width: 100%; }
.field small, .check-field small { color: var(--muted); font-weight: 450; }
input, select { width: 100%; min-height: 47px; border: 1px solid var(--line-strong); border-radius: 10px; padding: 10px 12px; color: var(--ink); background: var(--input); }
input:hover, select:hover { border-color: var(--accent); }
input::placeholder { color: var(--muted-subtle); opacity: 1; }
select:disabled, input:disabled { color: var(--muted); background: var(--soft); opacity: 1; }
input[type="password"] { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .03em; }
.drop-zone { position: relative; display: grid; place-items: center; gap: 6px; min-height: 205px; margin-top: 22px; border: 1.5px dashed var(--line-strong); border-radius: 15px; padding: 30px; text-align: center; background: var(--soft); cursor: pointer; transition: border-color .15s ease, background .15s ease; }
.drop-zone:hover, .drop-zone.is-dragging { border-color: var(--accent); background: var(--accent-soft); }
.drop-zone input { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; opacity: 0; cursor: pointer; }
.drop-zone strong { color: var(--navy); font-size: 18px; }
.drop-zone > span:not(.drop-icon) { max-width: 650px; color: var(--muted); }
.drop-zone small { color: var(--muted); }
.drop-icon { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 12px; color: var(--accent-dark); background: var(--accent-soft); font-size: 24px; }
.file-summary { margin-top: 12px; border: 1px solid var(--success-line); border-radius: 9px; padding: 10px 13px; color: var(--success-ink); background: var(--success-bg); font-weight: 690; }
details { margin-top: 22px; border: 1px solid var(--line); border-radius: 12px; background: var(--soft); }
details[open] { background: var(--panel-raised); }
summary { padding: 14px 16px; color: var(--navy); font-weight: 740; cursor: pointer; }
.details-body { border-top: 1px solid var(--line); padding: 18px; }
.check-field { display: flex; align-items: flex-start; gap: 10px; padding-top: 29px; }
.check-field input { flex: 0 0 auto; width: 18px; min-height: 18px; margin-top: 3px; }
.check-field span, .check-field small { display: block; }
.form-message { margin-top: 20px; border-left: 3px solid var(--danger); padding: 10px 14px; color: var(--danger-ink); background: var(--danger-bg); }
.submit-row { display: flex; align-items: center; gap: 18px; margin-top: 26px; }
.progress { margin: 0; color: var(--muted); }

.result-panel {
  --result-line: var(--success-line);
  --result-bg: var(--success-bg);
  --result-copy: var(--muted);
  --result-accent: var(--success);
  margin-top: 24px;
  border: 1px solid var(--result-line);
  border-radius: var(--radius);
  padding: clamp(22px, 4vw, 36px);
  background: var(--result-bg);
  box-shadow: var(--success-shadow);
}
.result-panel[data-state="REVIEW_REQUIRED"], .result-panel[data-state="REVIEW_RECOMMENDED"] {
  --result-line: var(--review-line);
  --result-bg: var(--review-bg);
  --result-copy: var(--review-ink);
  --result-accent: var(--review-ink);
  box-shadow: var(--warning-shadow);
}
.result-panel[data-state="BLOCKED"] {
  --result-line: var(--danger-line);
  --result-bg: var(--danger-bg);
  --result-copy: var(--danger-ink);
  --result-accent: var(--danger);
  box-shadow: var(--warning-shadow);
}
.result-panel:not(.error-panel) .eyebrow { color: var(--result-accent); }
.error-panel { display: flex; align-items: center; justify-content: space-between; gap: 24px; border-color: var(--danger-line); background: var(--danger-bg); }
.error-panel h3, .result-panel h3 { margin-bottom: 8px; font-size: 28px; }
.error-panel p { margin-bottom: 5px; color: var(--danger-ink); }
.request-id { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 12px; }
.result-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 18px; }
.state-badge[data-state="BLOCKED"] { border-color: var(--danger-line); color: var(--danger-ink); background: var(--danger-bg); }
.state-badge[data-state="READY"] { border-color: var(--success-line); color: var(--success-ink); background: var(--success-bg); }
.state-badge[data-state="REVIEW_REQUIRED"], .state-badge[data-state="REVIEW_RECOMMENDED"] { border-color: var(--review-line); color: var(--review-ink); background: var(--review-bg); }
.result-explanation { max-width: 850px; color: var(--result-copy); }
.result-counts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin: 24px 0 30px; }
.result-counts > div { border: 1px solid var(--result-line); border-radius: 10px; padding: 12px; background: var(--panel-raised); }
.result-counts dt { color: var(--muted); font-size: 12px; }
.result-counts dd { margin: 2px 0 0; color: var(--navy); font-size: 24px; font-weight: 800; }
.artifact-list { display: grid; gap: 10px; }
.artifact-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; border: 1px solid var(--result-line); border-radius: 11px; padding: 13px 14px; background: var(--panel-raised); }
.artifact-row strong, .artifact-row small { display: block; overflow-wrap: anywhere; }
.artifact-row small { color: var(--muted); }
.download-button { flex: 0 0 auto; min-height: 40px; padding-block: 7px; }

.privacy-section { display: grid; grid-template-columns: 1fr 1.2fr; gap: 60px; border-top: 1px solid var(--line); padding-block: 76px; }
.privacy-section h2 { font-size: clamp(27px, 3vw, 38px); }
.privacy-copy { color: var(--muted); }
.site-footer { border-top: 1px solid var(--line); padding-block: 24px; color: var(--muted); background: var(--footer); font-size: 13px; }
.site-footer .shell { display: flex; justify-content: space-between; gap: 20px; }
.site-footer .shell > div { display: flex; align-items: baseline; gap: 12px; }
.parent-brand { color: var(--heading); font-weight: 720; }

@media (max-width: 800px) {
  .hero, .converter-heading, .privacy-section { grid-template-columns: 1fr; }
  .hero { gap: 34px; padding-block: 64px; }
  .principle-grid { grid-template-columns: 1fr; }
  .principle-grid article { padding-top: 16px; }
  .field-grid { grid-template-columns: 1fr; }
  .check-field { padding-top: 4px; }
  .result-counts { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 520px) {
  .shell { width: min(100% - 24px, 1120px); }
  h1 { font-size: 43px; }
  .header-inner { min-height: 62px; }
  .header-inner { gap: 9px; }
  .header-actions { gap: 7px; }
  .theme-control { gap: 0; }
  .theme-control > span { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
  .theme-control select { max-width: 88px; padding-inline: 7px 22px; }
  .beta-badge { padding-inline: 8px; font-size: 10px; }
  .hero { padding-block: 48px 58px; }
  .converter-section { padding-block: 50px 72px; }
  .converter-card { border-radius: 15px; padding: 18px; }
  .drop-zone { min-height: 190px; padding: 22px 14px; }
  .submit-row, .error-panel, .result-header, .artifact-row, .site-footer .shell { align-items: stretch; flex-direction: column; }
  .site-footer .shell > div { align-items: flex-start; flex-direction: column; gap: 4px; }
  .submit-row .button, .artifact-row .button { width: 100%; }
  .state-badge { align-self: flex-start; }
  .result-counts { grid-template-columns: 1fr 1fr; }
}

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