/* Layout: step index on the left, one step (caption + screenshot or terminal) on the right; stacks on phones. */
:root { --bg: #f5f6f9; --panel: #ffffff; --text: #1c2230; --muted: #5a6476; --line: #dde2ea; --accent: #2346a8; --accent-text: #ffffff; --accent-soft: #e5ebfa; --code-bg: #10141c; --code-text: #d7deea; --shadow: #1c223020; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --bg: #11141a; --panel: #181c24; --text: #e4e8ef; --muted: #98a2b3; --line: #2a303c; --accent: #8fa8ff; --accent-text: #0f1420; --accent-soft: #1f2840; --code-bg: #0b0e13; --code-text: #d7deea; --shadow: #00000060; color-scheme: dark; } }
:root[data-theme="dark"] { --bg: #11141a; --panel: #181c24; --text: #e4e8ef; --muted: #98a2b3; --line: #2a303c; --accent: #8fa8ff; --accent-text: #0f1420; --accent-soft: #1f2840; --code-bg: #0b0e13; --code-text: #d7deea; --shadow: #00000060; color-scheme: dark; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
.app { display: grid; grid-template-columns: 300px minmax(0, 1fr); min-height: 100vh; }
nav { background: var(--panel); border-right: 1px solid var(--line); padding-block: 16px; overflow-y: auto;
      padding-left: max(12px, env(safe-area-inset-left, 0px)); padding-right: 12px;
      position: sticky; top: env(safe-area-inset-top, 0px); max-height: 100vh; }
nav h1 { font-size: 16px; margin: 0 8px 12px; text-wrap: balance; }
nav h2 { font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin: 16px 8px 4px; }
nav button { display: block; width: 100%; text-align: left; border: 0; background: none; color: var(--text);
             padding: 5px 8px; border-radius: 6px; font: inherit; font-size: 13px; cursor: pointer; }
nav button:hover { background: var(--accent-soft); }
nav button.on { background: var(--accent); color: var(--accent-text); }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
main { padding-block: 20px 40px; padding-left: 28px; padding-right: max(28px, env(safe-area-inset-right, 0px));
       max-width: 1100px; min-width: 0; }
.bar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 12px; }
.bar .count { color: var(--muted); font-size: 13px; margin-left: auto; font-variant-numeric: tabular-nums; }
.bar button { border: 1px solid var(--line); background: var(--panel); color: var(--text); padding: 6px 14px;
              border-radius: 8px; font: inherit; cursor: pointer; }
.bar button:disabled { opacity: .4; cursor: default; }
.section { color: var(--muted); font-size: 13px; }
h3 { margin: 2px 0 8px; font-size: 22px; text-wrap: balance; }
.text { margin: 0 0 14px; max-width: 80ch; }
.text code { background: var(--accent-soft); padding: 1px 4px; border-radius: 4px; font-size: 13px; overflow-wrap: anywhere; }
.shot { max-width: 100%; height: auto; border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 2px 10px var(--shadow); }
pre { background: var(--code-bg); color: var(--code-text); padding: 14px 16px; border-radius: 10px; overflow-x: auto;
      font: 12.5px/1.45 ui-monospace, Menlo, monospace; white-space: pre; margin: 0; }
@media (max-width: 760px) {
  .app { grid-template-columns: minmax(0, 1fr); }
  nav { position: static; max-height: 40vh; border-right: 0; border-bottom: 1px solid var(--line);
        padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
  main { padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
}