:root {
  color-scheme: dark;
  --bg: #080b10;
  --panel: rgba(19, 24, 32, 0.9);
  --panel-strong: #151b24;
  --line: rgba(255, 255, 255, 0.1);
  --text: #f5f7fa;
  --muted: #aab4c2;
  --lime: #c8ff45;
  --cyan: #59e4ff;
  --danger: #ff9d93;
  --shadow: rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  background:
    radial-gradient(circle at 50% 8%, rgba(89, 228, 255, 0.12), transparent 28rem),
    radial-gradient(circle at 20% 35%, rgba(200, 255, 69, 0.07), transparent 24rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

button, a, label { -webkit-tap-highlight-color: transparent; }
a { color: var(--cyan); }
.site-nav, .site-footer, .content { width: min(100% - 2rem, 760px); margin-inline: auto; }
.site-nav { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-block: 1rem; }
.site-name { color: var(--text); font-weight: 850; text-decoration: none; }
.site-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: .65rem 1rem; }
.site-links a { color: var(--muted); font-size: .86rem; text-decoration: none; }
.site-links a:hover, .site-links a[aria-current="page"] { color: var(--cyan); }

.hero { min-height: calc(100svh - 68px); display: grid; place-items: center; padding: 1.5rem 1rem 3rem; }
.finder { width: min(100%, 760px); text-align: center; }
.eyebrow { margin: 0 0 .35rem; color: var(--lime); font-size: .75rem; font-weight: 800; letter-spacing: .2em; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(2.3rem, 8vw, 5.2rem); line-height: 1; letter-spacing: -.055em; }
.subtitle { margin: .75rem auto 1.5rem; max-width: 42rem; color: var(--muted); font-size: clamp(1rem, 2.5vw, 1.2rem); }

.upload-card { padding: clamp(1rem, 4vw, 1.6rem); border: 1px solid var(--line); border-radius: 1.35rem; background: var(--panel); box-shadow: 0 1.25rem 4rem var(--shadow); }
.drop-zone { display: grid; place-items: center; min-height: 12rem; padding: 1.5rem; border: 1px dashed rgba(200,255,69,.5); border-radius: 1rem; background: rgba(200,255,69,.035); transition: border-color 120ms ease, background 120ms ease; }
.drop-zone.is-dragging { border-color: var(--lime); background: rgba(200,255,69,.1); }
.drop-zone.is-busy { opacity: .72; }
.upload-icon { display: grid; place-items: center; width: 3.2rem; height: 3.2rem; margin-bottom: .65rem; border-radius: 50%; background: rgba(89,228,255,.1); color: var(--cyan); font-size: 1.5rem; }
.drop-title { margin: 0; font-size: 1.2rem; font-weight: 850; }
.drop-copy { margin: .25rem 0 .9rem; color: var(--muted); }
.file-input { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }
.primary-button, .secondary-button {
  min-height: 2.8rem; padding: .7rem 1rem; border-radius: .7rem; font: inherit; font-weight: 800; cursor: pointer;
}
.primary-button { border: 1px solid rgba(200,255,69,.75); background: var(--lime); color: #0a0e08; }
.secondary-button { border: 1px solid var(--line); background: transparent; color: var(--text); }
.primary-button:disabled, .secondary-button:disabled { cursor: not-allowed; opacity: .45; }
.primary-button:focus-visible, .secondary-button:focus-visible, a:focus-visible { outline: 3px solid var(--cyan); outline-offset: 4px; }

.selected-file { min-height: 3rem; display: grid; align-content: center; margin-top: .8rem; color: var(--muted); }
.selected-file strong { color: var(--text); overflow-wrap: anywhere; }
.selected-file span { font-size: .85rem; }
.result-card { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 1rem; margin-top: .8rem; padding: 1rem 1.15rem; border: 1px solid var(--line); border-radius: 1rem; background: var(--panel-strong); text-align: left; }
.result-label { color: var(--muted); font-size: .75rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.result-value { display: block; color: var(--lime); font-size: clamp(2.6rem, 10vw, 4.5rem); font-variant-numeric: tabular-nums; letter-spacing: -.05em; line-height: 1; }
.result-unit { color: var(--muted); font-weight: 800; }
.result-card.has-result { border-color: rgba(200,255,69,.42); }
.status { min-height: 1.5rem; margin: .8rem 0 0; color: var(--muted); font-size: .9rem; }
.actions { display: flex; flex-wrap: wrap; justify-content: center; gap: .6rem; margin-top: .8rem; }

.content { padding: 3rem 0 5rem; }
.panel { padding: clamp(1.15rem,4vw,2rem); border: 1px solid var(--line); border-radius: 1.25rem; background: var(--panel-strong); box-shadow: 0 1.25rem 4rem var(--shadow); }
.panel + .panel { margin-top: 1rem; }
h2 { margin: 0 0 .8rem; font-size: clamp(1.25rem,4vw,1.65rem); letter-spacing: -.025em; }
h3 { margin: 1.35rem 0 .35rem; font-size: 1.05rem; }
.panel p, .panel li { color: var(--muted); }
.panel p { margin: .55rem 0; }
.instructions { display: grid; gap: .55rem; margin: 1rem 0 0; padding: 0; list-style: none; counter-reset: steps; }
.instructions li { counter-increment: steps; display: grid; grid-template-columns: 2rem 1fr; align-items: start; gap: .7rem; }
.instructions li::before { content: counter(steps); display: grid; place-items: center; width: 1.8rem; height: 1.8rem; border-radius: 50%; background: rgba(200,255,69,.12); color: var(--lime); font-size: .8rem; font-weight: 850; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; text-align: left; }
th, td { padding: .8rem .7rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; }
td { color: var(--muted); }
tr:last-child td { border-bottom: 0; }
.privacy { text-align: center; font-size: .86rem; color: var(--muted); }
.site-footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .75rem 1.5rem; padding-block: 1.5rem 2rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .85rem; }
.site-footer p { margin: 0; }

@media (max-width: 540px) {
  .site-nav { align-items: flex-start; }
  .site-links { gap: .5rem .75rem; }
  .hero { min-height: auto; padding-block: 1.25rem 2.5rem; }
  .result-card { grid-template-columns: 1fr; text-align: center; }
  .drop-zone { min-height: 10.5rem; padding: 1.15rem; }
  th, td { padding-inline: .5rem; }
}

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