:root {
  color-scheme: dark;
  --ink: #edf7f4;
  --muted: #9aaead;
  --quiet: #627574;
  --line: rgba(157, 210, 200, 0.16);
  --panel: rgba(11, 28, 34, 0.84);
  --panel-strong: #0c2229;
  --accent: #5de5c0;
  --accent-soft: rgba(93, 229, 192, 0.12);
  --danger: #ff9f92;
}

* { box-sizing: border-box; }

html { background: #071018; }

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 0%, rgba(41, 115, 111, 0.2), transparent 32rem),
    linear-gradient(180deg, #071018 0%, #09161d 58%, #071018 100%);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: #b6fff0; }
button, input { font: inherit; }
button { cursor: pointer; }

.page-shell { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }

.topbar {
  min-height: 82px;
  display: flex;
  align-items: center;
  gap: 26px;
  border-bottom: 1px solid var(--line);
}

.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-size: 15px; font-weight: 800; letter-spacing: -0.03em; white-space: nowrap; }
.brand b { color: var(--accent); font-weight: 500; }
.brand-mark { display: inline-flex; align-items: center; gap: 2px; height: 23px; }
.brand-mark i { display: block; width: 3px; border-radius: 4px; background: var(--accent); }
.brand-mark i:nth-child(1) { height: 10px; opacity: .62; }
.brand-mark i:nth-child(2) { height: 20px; }
.brand-mark i:nth-child(3) { height: 14px; opacity: .82; }
.brand-mark i:nth-child(4) { height: 7px; opacity: .52; }
.site-nav { display: flex; flex: 1; flex-wrap: wrap; justify-content: center; gap: 18px; }
.site-nav a { color: #a8bab7; font-size: 12px; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink); }
.topbar-note { color: var(--quiet); font-size: 11px; white-space: nowrap; }
.live-dot { display: inline-block; width: 6px; height: 6px; margin-right: 6px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px rgba(93, 229, 192, .08); }

.tool-layout { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(230px, .75fr); gap: 20px; padding: 42px 0 20px; }
.tool-card, .aside-card, .result-panel, .content-card, .faq-card { border: 1px solid var(--line); background: var(--panel); box-shadow: 0 22px 60px rgba(0, 0, 0, .18); }
.tool-card { padding: clamp(24px, 5vw, 54px); border-radius: 18px; }
.tool-heading { max-width: 650px; }
.eyebrow { margin: 0 0 11px; color: var(--accent); font-size: 10px; font-weight: 800; letter-spacing: .18em; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 720px; margin-bottom: 10px; font-size: clamp(36px, 6vw, 70px); line-height: .99; letter-spacing: -.065em; }
h2 { margin-bottom: 12px; font-size: clamp(22px, 3vw, 32px); line-height: 1.1; letter-spacing: -.04em; }
h3 { margin-bottom: 6px; font-size: 15px; line-height: 1.25; }
.lede { max-width: 520px; margin-bottom: 30px; color: var(--muted); font-size: 16px; }

.dropzone { position: relative; display: grid; justify-items: center; gap: 4px; padding: 34px 20px 30px; border: 1px dashed rgba(93, 229, 192, .48); border-radius: 14px; background: linear-gradient(135deg, rgba(93, 229, 192, .08), rgba(7, 16, 24, .14)); text-align: center; transition: border-color .2s, background .2s, transform .2s; }
.dropzone:hover, .dropzone:focus-visible, .dropzone.dragging { border-color: var(--accent); background: var(--accent-soft); outline: none; transform: translateY(-1px); }
.dropzone input { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.dropzone strong { font-size: 18px; }
.dropzone span { color: var(--muted); font-size: 13px; }
.dropzone small { margin-top: 8px; color: var(--quiet); font-size: 11px; letter-spacing: .04em; }
.drop-icon { display: flex; align-items: end; gap: 3px; height: 31px; margin-bottom: 10px; }
.drop-icon span { display: block; width: 7px; border-radius: 6px; background: var(--accent); }
.drop-icon span:nth-child(1) { height: 14px; opacity: .54; }
.drop-icon span:nth-child(2) { height: 31px; }
.drop-icon span:nth-child(3) { height: 21px; opacity: .76; }

.file-panel { display: flex; align-items: center; gap: 12px; min-width: 0; margin-top: 14px; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; background: rgba(255, 255, 255, .035); }
.file-panel > div { display: grid; min-width: 0; }
.file-panel strong, .file-panel span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-panel strong { font-size: 13px; }
.file-panel span { color: var(--muted); font-size: 11px; }
.file-badge { display: grid; flex: 0 0 38px; place-items: center; height: 38px; border-radius: 9px; color: var(--accent); background: var(--accent-soft); font-size: 10px; font-weight: 800; }
.icon-button { margin-left: auto; border: 0; background: transparent; color: var(--muted); font-size: 22px; line-height: 1; }
.icon-button:hover { color: var(--ink); }
.primary-button { display: flex; justify-content: space-between; align-items: center; width: 100%; margin-top: 16px; padding: 14px 17px; border: 1px solid var(--accent); border-radius: 9px; color: #061219; background: var(--accent); font-weight: 800; }
.primary-button:hover:not(:disabled) { background: #b6fff0; }
.primary-button:disabled { cursor: not-allowed; opacity: .36; }
.status { margin: 13px 0 0; color: var(--quiet); font-size: 11px; }
.error { margin-top: 13px; padding: 11px 13px; border: 1px solid rgba(255, 159, 146, .35); border-radius: 8px; color: var(--danger); background: rgba(255, 159, 146, .08); font-size: 12px; }
.hidden { display: none !important; }

.tool-aside { display: grid; gap: 10px; align-content: start; }
.aside-card { padding: 22px; border-radius: 13px; }
.aside-number { display: inline-grid; place-items: center; width: 24px; height: 24px; margin-bottom: 22px; border: 1px solid rgba(93, 229, 192, .45); border-radius: 50%; color: var(--accent); font-size: 10px; font-weight: 800; }
.aside-card h2 { margin-bottom: 8px; font-size: 19px; }
.aside-card p { margin-bottom: 0; color: var(--muted); font-size: 12px; }

.result-panel { margin: 0 0 20px; padding: clamp(20px, 4vw, 38px); border-radius: 18px; background: #f4f7f4; color: #182725; }
.result-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 20px; }
.result-heading .eyebrow { color: #168d76; }
.result-heading h2 { margin-bottom: 0; }
.result-meta { color: #5d706c; font-size: 12px; text-align: right; }
.score-frame { overflow: hidden; min-height: 160px; border: 1px solid #d5e0dc; border-radius: 12px; background: #fff; }
#score-stage { width: 100%; min-height: 160px; }
#score-stage svg { display: block; width: 100%; height: auto; }
.export-row { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 16px; }
.export-button { padding: 10px 13px; border: 1px solid #a9c3bb; border-radius: 7px; color: #17362f; background: #fff; font-size: 12px; font-weight: 750; }
.export-button:hover { border-color: #168d76; color: #0b6d5c; background: #e9f8f3; }
.text-button { margin-top: 14px; padding: 0; border: 0; color: #168d76; background: transparent; font-size: 12px; font-weight: 700; }

.content-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; margin-bottom: 20px; }
.content-card, .faq-card { padding: clamp(22px, 4vw, 38px); border-radius: 16px; }
.content-card p, .faq-card p { color: var(--muted); font-size: 13px; }
.content-card p:last-child, .faq-card p:last-child { margin-bottom: 0; }
code { padding: 1px 4px; border-radius: 4px; color: var(--accent); background: rgba(93, 229, 192, .08); font-size: .92em; }
.faq-card { margin-bottom: 26px; }
.faq-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px 38px; }
.faq-grid > div { padding-top: 17px; border-top: 1px solid var(--line); }
.faq-grid h3 { color: var(--ink); }

.site-footer { display: flex; align-items: center; gap: 18px; min-height: 90px; color: var(--quiet); font-size: 11px; }
.footer-rule { width: 25px; height: 1px; background: var(--accent); }
.site-footer p { margin: 0; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 14px; margin-left: auto; }
.site-footer nav a { color: var(--muted); }

@media (max-width: 820px) {
  .topbar { align-items: flex-start; flex-wrap: wrap; gap: 14px 20px; padding: 18px 0; }
  .site-nav { order: 3; flex-basis: 100%; justify-content: flex-start; }
  .topbar-note { margin-left: auto; }
  .tool-layout { grid-template-columns: 1fr; }
  .tool-aside { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 600px) {
  .page-shell { width: min(100% - 24px, 560px); }
  .topbar { min-height: 0; }
  .site-nav { gap: 11px 14px; }
  .site-nav a { font-size: 11px; }
  .topbar-note { display: none; }
  .tool-layout { padding-top: 24px; }
  .tool-card { padding: 22px 16px; }
  h1 { font-size: clamp(35px, 13vw, 52px); }
  .lede { font-size: 14px; }
  .tool-aside, .content-grid, .faq-grid { grid-template-columns: 1fr; }
  .aside-card { padding: 18px; }
  .aside-number { margin-bottom: 14px; }
  .result-heading { display: block; }
  .result-meta { display: block; margin-top: 7px; text-align: left; }
  .result-panel { padding: 18px 12px; }
  .export-row { display: grid; grid-template-columns: 1fr 1fr; }
  .export-button:last-child { grid-column: 1 / -1; }
  .site-footer { align-items: flex-start; flex-wrap: wrap; padding: 10px 0 22px; }
  .site-footer nav { flex-basis: 100%; margin-left: 0; }
}