:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --bg-card: #ffffff;
  --fg: #16181d;
  --fg-muted: #5f6672;
  --line: #e3e6ea;
  --accent: #2f6df6;
  --accent-fg: #ffffff;
  --danger: #c0362c;
  --ok: #1f8a4c;
  --radius: 10px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101216;
    --bg-soft: #15181e;
    --bg-card: #171b21;
    --fg: #e7e9ec;
    --fg-muted: #9aa2ae;
    --line: #262b33;
    --accent: #5b8cff;
    --accent-fg: #0d1117;
    --danger: #ff6b5e;
    --ok: #4cc47f;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 960px; margin: 0 auto; padding: 0 24px; }

/* header */
.site-head {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}
.site-head .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 62px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--fg);
  font-size: 16px;
}
.brand:hover { text-decoration: none; }
.brand svg { display: block; }
.nav { display: flex; align-items: center; gap: 22px; font-size: 14px; }
.nav a { color: var(--fg-muted); }
.nav a:hover { color: var(--fg); text-decoration: none; }

.btn {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--bg-soft);
  color: var(--fg);
  font: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  text-align: center;
}
.btn:hover { text-decoration: none; border-color: var(--fg-muted); }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-fg);
}
.btn-primary:hover { filter: brightness(1.06); border-color: var(--accent); }
.btn-block { display: block; width: 100%; padding: 10px 16px; }

/* hero */
.hero { padding: 82px 0 60px; }
.hero h1 {
  margin: 0 0 16px;
  font-size: 40px;
  line-height: 1.15;
  letter-spacing: -0.025em;
  font-weight: 640;
  max-width: 17ch;
}
.hero p {
  margin: 0 0 28px;
  font-size: 17px;
  color: var(--fg-muted);
  max-width: 56ch;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 18px;
  padding: 22px 0 70px;
}
.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 20px;
}
.card h3 { margin: 0 0 7px; font-size: 15px; font-weight: 600; }
.card p { margin: 0; color: var(--fg-muted); font-size: 14px; }

/* status strip */
.strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 18px 0;
  font-size: 14px;
  color: var(--fg-muted);
}
.strip .wrap { display: flex; gap: 26px; flex-wrap: wrap; align-items: center; }
.dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--ok);
  margin-right: 7px;
  vertical-align: 1px;
}

/* footer */
.site-foot {
  padding: 30px 0 44px;
  font-size: 13px;
  color: var(--fg-muted);
}
.site-foot .wrap { display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap; }
.site-foot a { color: var(--fg-muted); }

/* auth */
.auth-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg-soft);
}
.auth-body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 20px;
}
.auth-box { width: 100%; max-width: 372px; }
.auth-box .brand { justify-content: center; margin-bottom: 22px; }
.auth-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 26px 24px;
}
.auth-card h1 { margin: 0 0 4px; font-size: 19px; font-weight: 600; letter-spacing: -0.01em; }
.auth-card .sub { margin: 0 0 22px; color: var(--fg-muted); font-size: 14px; }

.field { margin-bottom: 15px; }
.field label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  font-weight: 500;
}
.field input {
  width: 100%;
  padding: 9px 11px;
  font: inherit;
  font-size: 14px;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.field input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent);
}
.row-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
  font-size: 13px;
  color: var(--fg-muted);
}
.row-between label { display: flex; align-items: center; gap: 7px; cursor: pointer; }

.notice {
  display: none;
  margin-bottom: 16px;
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 13px;
  border: 1px solid color-mix(in srgb, var(--danger) 40%, transparent);
  background: color-mix(in srgb, var(--danger) 10%, transparent);
  color: var(--danger);
}
.notice.ok {
  border-color: color-mix(in srgb, var(--ok) 40%, transparent);
  background: color-mix(in srgb, var(--ok) 10%, transparent);
  color: var(--ok);
}
.notice.shown { display: block; }

.auth-foot {
  margin-top: 18px;
  text-align: center;
  font-size: 13px;
  color: var(--fg-muted);
}

/* app */
.app-head {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky;
  top: 0;
}
.app-main { padding: 30px 0 60px; }
.crumbs { font-size: 13px; color: var(--fg-muted); margin-bottom: 16px; font-family: var(--mono); }
table.files { width: 100%; border-collapse: collapse; font-size: 14px; }
table.files th {
  text-align: left;
  font-weight: 500;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--fg-muted);
  padding: 0 12px 9px;
  border-bottom: 1px solid var(--line);
}
table.files td { padding: 11px 12px; border-bottom: 1px solid var(--line); }
table.files tr:hover td { background: var(--bg-soft); }
table.files td.size, table.files td.date { color: var(--fg-muted); white-space: nowrap; font-variant-numeric: tabular-nums; }
.fname { display: flex; align-items: center; gap: 9px; }

/* error pages */
.err {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
}
.err h1 { font-size: 46px; margin: 0 0 8px; font-weight: 640; letter-spacing: -0.03em; }
.err p { color: var(--fg-muted); margin: 0 0 22px; }

@media (max-width: 640px) {
  .hero { padding: 56px 0 40px; }
  .hero h1 { font-size: 30px; }
  .nav { gap: 14px; }
  .nav .hide-sm { display: none; }
  table.files .date { display: none; }
}