/* ============================================================
   清水 — personal writer site
   Palette: paper #F7F5EF · ink #21201C · celadon #5C7A6E
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Newsreader:ital,wght@0,400;0,500;1,400&family=Noto+Serif+SC:wght@400;500;600&family=Source+Serif+4:ital,wght@0,400;1,400&family=Inter:wght@400;500&display=swap');

:root {
  --paper: #F7F5EF;
  --paper-deep: #EFEBE0;
  --ink: #21201C;
  --ink-soft: #4A4740;
  --stone: #8B8579;
  --rule: #DDD7C8;
  --celadon: #5C7A6E;
  --celadon-deep: #46594F;

  --serif-zh: 'Noto Serif SC', serif;
  --serif-en: 'Source Serif 4', serif;
  --display-zh: 'Noto Serif SC', serif;
  --display-en: 'Newsreader', serif;
  --sans: 'Inter', -apple-system, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif-zh);
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body :lang(en), body .en-text { font-family: var(--serif-en); }

::selection { background: var(--celadon); color: var(--paper); }

a {
  color: inherit;
  text-decoration: none;
}

/* ---------- language toggle logic ---------- */
.zh, .en { }
body.lang-zh .en { display: none; }
body.lang-en .zh { display: none; }
body.lang-en { font-family: var(--serif-en); }

/* ---------- layout shell ---------- */
.wrap {
  max-width: 680px;
  margin: 0 auto;
  padding: 5rem 1.75rem 6rem;
}

/* ---------- header ---------- */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 3.25rem;
  gap: 1rem;
}

.site-name {
  font-family: var(--display-zh);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin: 0;
}
body.lang-en .site-name { font-family: var(--display-en); font-weight: 500; font-style: italic; }

.site-name a { display: inline-block; }

.lang-toggle {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--stone);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0.32rem 0.85rem;
  cursor: pointer;
  background: transparent;
  white-space: nowrap;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.lang-toggle:hover { border-color: var(--celadon); color: var(--celadon-deep); }
.lang-toggle:focus-visible { outline: 2px solid var(--celadon); outline-offset: 2px; }

/* ---------- ripple divider — the signature element ---------- */
.ripple {
  width: 100%;
  height: 14px;
  margin: 0 0 3rem;
  overflow: hidden;
  color: var(--rule);
}
.ripple svg { display: block; width: 200%; height: 14px; animation: ripple-drift 16s linear infinite; }
@media (prefers-reduced-motion: reduce) { .ripple svg { animation: none; } }
@keyframes ripple-drift { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* ---------- nav ---------- */
nav.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.6rem;
  margin-bottom: 3.5rem;
  font-family: var(--sans);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
}
nav.main-nav a {
  color: var(--ink-soft);
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}
nav.main-nav a:hover,
nav.main-nav a:focus-visible { color: var(--celadon-deep); border-bottom-color: var(--celadon); }
nav.main-nav a.active { color: var(--ink); border-bottom-color: var(--ink); }

/* ---------- typography ---------- */
h1 {
  font-family: var(--display-zh);
  font-size: 1.9rem;
  font-weight: 600;
  line-height: 1.5;
  margin: 0 0 1.75rem;
}
body.lang-en h1 { font-family: var(--display-en); font-weight: 500; font-style: italic; }

p { margin: 0 0 1.4rem; font-size: 1.02rem; color: var(--ink); }
p.lede { color: var(--ink-soft); }

.section-title {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--stone);
  margin: 3rem 0 1.4rem;
}
.section-title:first-of-type { margin-top: 0; }

/* ---------- works / essays list ---------- */
.entry-list { list-style: none; margin: 0; padding: 0; }
.entry {
  padding: 1.5rem 0;
  border-top: 1px solid var(--rule);
}
.entry:last-child { padding-bottom: 0; }
.entry-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
}
.entry-title {
  font-family: var(--display-zh);
  font-size: 1.15rem;
  font-weight: 600;
}
body.lang-en .entry-title { font-family: var(--display-en); font-weight: 500; font-style: italic; }
.entry-title a:hover, .entry-title a:focus-visible { color: var(--celadon-deep); }
.entry-meta {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--stone);
  white-space: nowrap;
}
.entry-desc { margin-top: 0.5rem; color: var(--ink-soft); font-size: 0.97rem; }

/* ---------- about: headshot ---------- */
.headshot-wrap {
  margin: 0 0 2.5rem;
}
.headshot-wrap img {
  width: 100%;
  max-width: 320px;
  height: auto;
  display: block;
  border-radius: 2px;
}
.photo-credit {
  font-family: var(--sans);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--stone);
  margin-top: 0.5rem;
}

/* ---------- books grid (文集) — uniform cover size, aligned text ---------- */
.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 2.25rem 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  align-items: stretch;
}
.book-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}
.book-cover {
  width: 100%;
  aspect-ratio: 2 / 3;
  overflow: hidden;
  background: var(--paper-deep);
}
.book-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.book-title {
  font-family: var(--display-zh);
  font-weight: 600;
  font-size: 0.98rem;
  line-height: 1.4;
  margin-top: 0.85rem;
  min-height: 2.75rem;
}
body.lang-en .book-title { font-family: var(--display-en); font-weight: 500; font-style: italic; }
.book-meta {
  font-family: var(--sans);
  font-size: 0.72rem;
  color: var(--stone);
  margin-top: auto;
  padding-top: 0.5rem;
  line-height: 1.5;
}

/* ---------- dark room (小黑屋) ---------- */
.dr-block {
  margin-bottom: 2.75rem;
  padding-bottom: 2.75rem;
  border-bottom: 1px solid var(--rule);
}
.dr-block:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.dr-photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 0.85rem;
}
.dr-photo-grid .ph {
  aspect-ratio: 4 / 5;
  background: var(--paper-deep);
  border: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--sans);
  font-size: 0.68rem;
  color: var(--stone);
  text-align: center;
  padding: 0.5rem;
}
.guestbook-note {
  border: 1px solid var(--rule);
  padding: 1.5rem;
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--stone);
  text-align: center;
}

/* ---------- guestbook form ---------- */
.gb-form { display: flex; flex-direction: column; gap: 1.25rem; max-width: 480px; }
.gb-field { display: flex; flex-direction: column; gap: 0.4rem; }
.gb-field label {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--stone);
}
.gb-field input,
.gb-field textarea {
  font-family: var(--serif-zh);
  font-size: 0.98rem;
  color: var(--ink);
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--rule);
  padding: 0.5rem 0.1rem;
  outline: none;
  transition: border-color 0.2s ease;
  resize: vertical;
}
body.lang-en .gb-field input,
body.lang-en .gb-field textarea { font-family: var(--serif-en); }
.gb-field input:focus,
.gb-field textarea:focus { border-color: var(--celadon); }
.gb-field textarea { min-height: 6rem; }
.gb-submit {
  align-self: flex-start;
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--ink);
  border: 1px solid var(--ink);
  border-radius: 999px;
  padding: 0.5rem 1.4rem;
  background: transparent;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.gb-submit:hover { background: var(--celadon); border-color: var(--celadon); color: var(--paper); }
.gb-submit:disabled { opacity: 0.5; cursor: default; }
.gb-status {
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--celadon-deep);
  display: none;
}
.gb-status.show { display: block; }
.gb-status.error { color: #a3453b; }
.gb-hidden { position: absolute; left: -9999px; top: -9999px; }
.gb-hint {
  font-family: var(--sans);
  font-size: 0.72rem;
  color: var(--stone);
  margin-top: 0.75rem;
}

/* ---------- contact ---------- */
.contact-list { list-style: none; margin: 0; padding: 0; }
.contact-list li {
  padding: 1rem 0;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.contact-list li:last-child { border-bottom: 1px solid var(--rule); }
.contact-label {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--stone);
  text-transform: uppercase;
}
.contact-value a { border-bottom: 1px solid var(--rule); transition: border-color 0.2s ease, color 0.2s ease; }
.contact-value a:hover, .contact-value a:focus-visible { color: var(--celadon-deep); border-color: var(--celadon); }

/* ---------- footer ---------- */
footer.site-footer {
  margin-top: 5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--stone);
}

/* ---------- focus ---------- */
a:focus-visible { outline: 2px solid var(--celadon); outline-offset: 2px; border-radius: 2px; }

/* ---------- responsive ---------- */
@media (max-width: 540px) {
  .wrap { padding: 3.25rem 1.25rem 4rem; }
  .site-header { flex-direction: row; align-items: center; }
  h1 { font-size: 1.6rem; }
}