:root {
  --bg: #0b0e13;
  --surface: #12161e;
  --surface-2: #181d27;
  --border: #252c3a;
  --text: #e7eaf0;
  --muted: #8b93a5;
  --cyan: #3ee0e8;
  --violet: #a77bff;
  --accent: #6fb6ff;
  --ok: #3ddc97;
  --bad: #ff6b7a;
  --radius: 12px;
  --mono: ui-monospace, "Cascadia Code", Consolas, monospace;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: var(--mono); font-size: 0.9em; }

.wrap { width: 100%; max-width: 960px; margin: 0 auto; padding: 0 16px; }

/* Top bar */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: rgba(11, 14, 19, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 650; }
.brand:hover { text-decoration: none; }
.topbar nav { display: flex; gap: 20px; }
.topbar nav a { color: var(--muted); font-size: 0.95rem; }
.topbar nav a:hover { color: var(--text); text-decoration: none; }

/* Hero */
.hero { text-align: center; padding-top: 72px; padding-bottom: 56px; }
.hero-logo { border-radius: 50%; box-shadow: 0 0 60px rgba(111, 182, 255, 0.25); }
.hero h1 {
  margin: 16px 0 8px;
  font-size: clamp(2.2rem, 6vw, 3.2rem);
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, var(--cyan), var(--accent), var(--violet));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lede { max-width: 560px; margin: 0 auto; color: var(--muted); font-size: 1.1rem; }
.cta { margin-top: 32px; }
.meta { margin: 10px 0 0; color: var(--muted); font-size: 0.9rem; }

.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 26px; border-radius: 999px;
  font-weight: 600; font-size: 1.05rem;
  border: 1px solid transparent; cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.btn-primary {
  color: #071018;
  background: linear-gradient(90deg, var(--cyan), var(--accent) 55%, var(--violet));
  box-shadow: 0 6px 24px rgba(111, 182, 255, 0.3);
}
.btn-primary:hover { box-shadow: 0 8px 32px rgba(111, 182, 255, 0.45); }
.btn-small { padding: 8px 16px; font-size: 0.92rem; }
.btn-ghost { color: var(--text); background: var(--surface-2); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--accent); }

/* Sections */
.section { padding-top: 40px; padding-bottom: 40px; border-top: 1px solid var(--border); }
.section h2 { margin: 0 0 4px; font-size: 1.5rem; }
.section-sub { margin: 0 0 24px; color: var(--muted); }

/* File list */
.file-list { display: grid; gap: 12px; }
.file {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
}
.file.recommended { border-color: rgba(111, 182, 255, 0.5); }
.file-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; }
.file-title { margin: 0; font-size: 1.05rem; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.badge {
  font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em;
  padding: 2px 8px; border-radius: 999px;
  color: var(--accent); background: rgba(111, 182, 255, 0.12);
}
.file-desc { margin: 4px 0 0; color: var(--muted); font-size: 0.94rem; }
.file-info { margin: 6px 0 0; color: var(--muted); font-size: 0.85rem; font-family: var(--mono); }
.hash {
  margin-top: 14px; display: flex; align-items: center; gap: 8px;
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
  padding: 8px 8px 8px 12px;
}
.hash-label { color: var(--muted); font-size: 0.75rem; font-weight: 600; flex: none; }
.hash code { flex: 1; min-width: 0; overflow-wrap: anywhere; color: var(--text); font-size: 0.82rem; }

.copy {
  flex: none; cursor: pointer;
  font: 600 0.8rem system-ui, sans-serif;
  color: var(--muted); background: var(--surface-2);
  border: 1px solid var(--border); border-radius: 6px; padding: 5px 10px;
}
.copy:hover { color: var(--text); border-color: var(--accent); }
.copy.done { color: var(--ok); border-color: var(--ok); }

.sums-link { margin: 16px 0 0; font-size: 0.9rem; color: var(--muted); }
.error { color: var(--bad); }

/* Verify */
.verify-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; min-width: 0; }
.card h3 { margin: 0 0 6px; font-size: 1rem; }
.card h3:not(:first-child) { margin-top: 18px; }
.card p { margin: 0 0 12px; color: var(--muted); font-size: 0.94rem; }
.dropzone {
  display: flex; align-items: center; justify-content: center; text-align: center;
  min-height: 120px; padding: 16px;
  border: 2px dashed var(--border); border-radius: 10px;
  color: var(--muted); cursor: pointer; transition: border-color 0.15s, background 0.15s;
}
.dropzone:hover, .dropzone.over { border-color: var(--accent); background: rgba(111, 182, 255, 0.06); color: var(--text); }
.verify-result { margin-top: 12px; padding: 12px; border-radius: 8px; font-size: 0.9rem; overflow-wrap: anywhere; }
.verify-result.ok { background: rgba(61, 220, 151, 0.1); border: 1px solid rgba(61, 220, 151, 0.4); }
.verify-result.bad { background: rgba(255, 107, 122, 0.1); border: 1px solid rgba(255, 107, 122, 0.4); }
.verify-result.pending { background: var(--surface-2); border: 1px solid var(--border); color: var(--muted); }
.verify-result strong { display: block; margin-bottom: 4px; }
.verify-result code { font-size: 0.8rem; color: var(--muted); }
.code {
  display: flex; align-items: center; gap: 8px;
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 8px 8px 8px 12px;
}
.code code { flex: 1; min-width: 0; overflow-wrap: anywhere; font-size: 0.82rem; }
.hint { margin-top: 14px !important; font-size: 0.85rem !important; }

/* Install */
.steps { margin: 0; padding-left: 22px; display: grid; gap: 12px; }
.steps li { padding-left: 4px; color: var(--muted); }
.steps strong { color: var(--text); }
.note { margin: 24px 0 0; padding: 14px 16px; background: var(--surface); border-left: 3px solid var(--accent); border-radius: 0 8px 8px 0; color: var(--muted); font-size: 0.94rem; }

.footer {
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  padding-top: 24px; padding-bottom: 40px;
  border-top: 1px solid var(--border); color: var(--muted); font-size: 0.85rem;
}

@media (max-width: 720px) {
  .verify-grid { grid-template-columns: 1fr; }
  .file-head { flex-direction: column; }
  .topbar nav { gap: 14px; }
  .hero { padding-top: 48px; }
}
@media (max-width: 380px) {
  .topbar nav a:last-child { display: none; }
}