:root {
  color-scheme: light;
  --ink: #1c2836;
  --muted: #526173;
  --line: #d5e0ea;
  --paper: #f4f7fb;
  --card: #ffffff;
  --accent: #1d4e89;
  --soft: #e7f0fa;
  --warn: #9f1239;
}

* { box-sizing: border-box; }

html { overflow-x: clip; }

body {
  margin: 0;
  background:
    linear-gradient(180deg, var(--soft) 0, transparent 16rem),
    var(--paper);
  color: var(--ink);
  font: 1.05rem/1.6 "Segoe UI", system-ui, sans-serif;
}

a { color: var(--accent); }

.wrap {
  width: min(42rem, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.25rem 0 4rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.28rem 0.8rem 0.28rem 0.28rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 50%;
}

h1 {
  margin: 1rem 0 0.75rem;
  font-size: clamp(2rem, 4.6vw, 2.6rem);
  font-weight: 760;
  letter-spacing: -0.04em;
  line-height: 1.08;
}

h1::after {
  content: "";
  display: block;
  width: 3.25rem;
  height: 0.28rem;
  margin-top: 0.75rem;
  border-radius: 99px;
  background: var(--accent);
}

.lead { margin: 0 0 1.15rem; color: var(--muted); }

h2 {
  margin: 2.2rem 0 0.7rem;
  font-size: 1.35rem;
  font-weight: 720;
  letter-spacing: -0.03em;
}

h3 { margin: 1.2rem 0 0.3rem; font-size: 1.02rem; }

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 4px solid var(--accent);
  border-radius: 16px;
  padding: 1.05rem;
}

.pickfile {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  margin: 0 0 0.9rem;
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--accent);
  border-radius: 10px;
  background: var(--soft);
  font-weight: 700;
  cursor: pointer;
}

.pickfile input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.result {
  margin-top: 0.4rem;
  padding: 0.9rem 0.95rem;
  border-radius: 12px;
  background: var(--ink);
  color: #f8fbff;
}

.sentence { margin: 0; font-size: 1.15rem; font-weight: 700; }

.detail { margin: 0.55rem 0 0; color: #d5e2f2; }

.warn { margin: 0.7rem 0 0; color: var(--warn); font-weight: 700; }

.preview {
  display: block;
  max-width: 100%;
  max-height: 280px;
  margin: 0.9rem 0 0;
  border-radius: 12px;
  background: #fff;
}

.button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 48px;
  margin-top: 0.85rem;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  font-weight: 750;
  text-decoration: none;
}

.button:hover { background: #163e6e; }

ul.plain { margin: 0.2rem 0 0; padding-left: 1.15rem; }

ul.plain li { margin: 0.4rem 0; }

footer {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

footer nav { display: flex; flex-wrap: wrap; gap: 0.4rem; }

footer nav a {
  display: inline-block;
  padding: 0.28rem 0.65rem;
  border-radius: 999px;
  background: var(--soft);
  text-decoration: none;
  color: var(--ink);
}

footer a[aria-current="page"] { background: var(--ink); color: #fff; font-weight: 700; }

footer p { margin: 0.7rem 0 0; }

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