/* 萌芽中。 — mengyahh.com */
:root {
  color-scheme: light;
  --bg: #fbf8f1;
  --surface: #f3eee1;
  --ink: #262a21;
  --ink-soft: #5a5f50;
  --muted: #7c7764;
  --accent: #4b7a3c;
  --accent-soft: rgba(75, 122, 60, 0.12);
  --border: rgba(38, 42, 33, 0.14);
  --border-strong: rgba(38, 42, 33, 0.3);
  --shadow: 0 1px 2px rgba(38, 42, 33, 0.06), 0 8px 24px rgba(38, 42, 33, 0.06);
}

* { box-sizing: border-box; }
html { background: var(--bg); scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Noto Sans TC", -apple-system, "PingFang TC", "Microsoft JhengHei", sans-serif;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
.serif, h1, h2, h3, .wordmark { font-family: "Noto Serif TC", "Songti TC", serif; }
.mono { font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, monospace; }
.wrap { max-width: 1000px; margin: 0 auto; padding: 0 24px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--bg); padding: 8px 14px; border-radius: 4px; z-index: 20; }
.skip:focus { left: 8px; }

.eyebrow { font-family: "IBM Plex Mono", ui-monospace, monospace; font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); margin: 0 0 14px; }

.chip { font-size: 12px; line-height: 1; padding: 4px 9px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); }

/* photo banner (About / Portfolio) and shared buttons */
.banner { margin: 28px 0 0; border-radius: 14px; overflow: hidden; aspect-ratio: 21 / 8; background: var(--surface); }
.banner img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: center 42%; }
.btn {
  display: inline-block; padding: 11px 24px; border-radius: 999px; border: 1px solid var(--accent);
  background: var(--accent); color: var(--bg); font-size: 15px; font-weight: 700; text-decoration: none;
}
.btn:hover { filter: brightness(1.1); text-decoration: none; }
.btn.ghost { background: transparent; color: var(--accent); }
.btn.ghost:hover { background: var(--accent-soft); filter: none; }

/* header */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.topbar .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 12px; padding-bottom: 12px; }
.wordmark { font-size: 20px; font-weight: 700; margin: 0; letter-spacing: 0.02em; }
.wordmark a { color: var(--ink); text-decoration: none; }
.wordmark span { color: var(--accent); }
.topnav { display: flex; flex-wrap: wrap; gap: 4px 20px; list-style: none; margin: 0; padding: 0; font-size: 14.5px; }
.topnav a { color: var(--ink-soft); text-decoration: none; padding: 4px 0; border-bottom: 2px solid transparent; }
.topnav a:hover { color: var(--accent); }
.topnav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--accent); }

/* footer */
footer { margin-top: 72px; border-top: 1px solid var(--border); padding: 40px 0 64px; color: var(--ink-soft); font-size: 14px; }
footer .bio { font-family: "Noto Serif TC", serif; font-size: 17px; color: var(--ink); margin: 0 0 6px; }
footer p { margin: 0 0 10px; }
footer .links { display: flex; flex-wrap: wrap; gap: 6px 22px; margin-top: 14px; }
footer .copy { margin-top: 26px; font-size: 12.5px; color: var(--muted); }

@media (max-width: 640px) {
  .banner { aspect-ratio: 16 / 9; margin-top: 18px; }
  .wrap { padding: 0 18px; }
  .topbar .wrap { flex-direction: column; align-items: flex-start; gap: 6px; }
  .topnav { gap: 2px 16px; font-size: 14px; }
}

/* language switcher + Japanese fonts */
.topnav .langs { font-family: "IBM Plex Mono", ui-monospace, monospace; font-size: 12px; letter-spacing: 0.04em; color: var(--muted); margin-left: 6px; padding-left: 14px; border-left: 1px solid var(--border-strong, var(--border)); white-space: nowrap; }
.topnav .langs a { color: var(--muted); border-bottom: 0; padding: 4px 0; }
.topnav .langs a[aria-current="true"] { color: var(--accent); font-weight: 700; }
@media (max-width: 640px) { .topnav .langs { margin-left: 0; padding-left: 0; border-left: 0; } }
html[lang="ja"] body { font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic UI", "Meiryo", sans-serif; }
html[lang="ja"] .serif, html[lang="ja"] h1, html[lang="ja"] h2, html[lang="ja"] h3, html[lang="ja"] .wordmark { font-family: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", serif; }
html[lang="ja"] footer .bio { font-family: "Noto Serif JP", serif; }
/* English: justified inter-character spacing is for CJK text only */
html[lang="en"] .prose p, html[lang="en"] .prose li, html[lang="en"] .body p, html[lang="en"] .body li,
html[lang="en"] .sec-body p, html[lang="en"] .sec-body li { text-align: left; text-justify: auto; }
html[lang="ja"] { word-break: auto-phrase; line-break: strict; }
h1, h2, h3 { text-wrap: balance; }