/* ============================================
   Lanjia's personal site — shared stylesheet
   ============================================ */

/* Import elegant fonts from Google (free, loads on page view) */
@import url('https://fonts.googleapis.com/css2?family=Caveat:wght@400;500;600;700&family=Fraunces:opsz,wght@9..144,300;9..144,400;9..144,500;9..144,600;9..144,700&family=Inter:wght@300;400;500;600&family=Noto+Serif:ital,wght@0,400;0,500;1,400;1,500&display=swap');

:root {
  --bg: #f7f3ec;
  --bg-elevated: #fffdf8;
  --ink: #2a2724;
  --muted: #7a716a;
  --accent: #b85c4d;          /* warm terracotta */
  --accent-deep: #8f3f31;
  --accent-soft: #f0d9d1;
  --border: #e8dfd0;
  --shadow: 0 1px 3px rgba(60, 40, 30, 0.04), 0 8px 24px rgba(60, 40, 30, 0.06);
  --shadow-lift: 0 2px 6px rgba(60, 40, 30, 0.08), 0 16px 36px rgba(60, 40, 30, 0.1);
  --max-width: 880px;
  --serif: 'Fraunces', Georgia, 'Times New Roman', serif;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --hand: 'Caveat', 'Brush Script MT', cursive;
}

/* ============================================
   Home-page hero animation (brainwave rings)
   ============================================ */
.hero-animation {
  position: relative;
  width: 100%;
  min-height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 1rem 0 3rem;
  overflow: hidden;
  border-radius: 12px;
  background:
    radial-gradient(ellipse at center,
      rgba(255, 251, 243, 0.9) 0%,
      rgba(247, 243, 236, 0.3) 55%,
      transparent 80%),
    var(--bg);
}

.hero-animation__svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* Each wavy ring rotates slowly. Different rings get different speeds
   via inline animation-duration set in JS. Inner rings = opaque, outer
   = faint (opacity set inline per-path). */
.hero-animation__svg path {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1;
  /* Sharp corners at every wave peak — mitered joins, no rounding.
     High miter limit so acute spikes don't get clipped to bevels. */
  stroke-linejoin: miter;
  stroke-linecap: butt;
  stroke-miterlimit: 20;
  transform-origin: center;
  transform-box: fill-box;
  animation: ring-rotate 40s linear infinite;
  will-change: transform;
}

@keyframes ring-rotate {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* Gentle breathing of the whole cluster */
.hero-animation__svg {
  animation: cluster-breathe 8s ease-in-out infinite;
}

@keyframes cluster-breathe {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.03); }
}

/* Text stack in the center — sits above the SVG */
.hero-animation__text {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2rem 1rem;
}

.hero-animation__text .line-en {
  font-family: var(--hand);
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.1;
  margin-bottom: 0.5rem;
  letter-spacing: 0.01em;
}

.hero-animation__text .line-pinyin {
  /* Noto Serif first — it has proper glyphs for all pinyin tone marks
     (ǐ ǎ ǒ ā etc). Fraunces doesn't, so we'd get broken rendering. */
  font-family: 'Noto Serif', Georgia, 'Times New Roman', serif;
  font-style: italic;
  font-size: clamp(1rem, 2.2vw, 1.35rem);
  color: var(--accent-deep);
  font-weight: 400;
  margin-bottom: 0.35rem;
  letter-spacing: 0.03em;
}

.hero-animation__text .line-fr {
  font-family: var(--serif);
  font-size: clamp(0.95rem, 2vw, 1.2rem);
  color: var(--muted);
  font-weight: 300;
  font-style: italic;
  letter-spacing: 0.02em;
}

/* Respect users who prefer reduced motion */
@media (prefers-reduced-motion: reduce) {
  .hero-animation__svg,
  .hero-animation__svg path {
    animation: none !important;
  }
}

@media (max-width: 500px) {
  .hero-animation { min-height: 420px; }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 17px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent-deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

a:hover {
  border-bottom-color: var(--accent);
  color: var(--accent);
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

main {
  flex: 1;
  padding: 3rem 0 5rem;
}

/* --- Header / nav --- */
.site-header {
  padding: 1.5rem 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-title {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 500;
  font-style: italic;
  letter-spacing: 0.01em;
}

.site-title a {
  color: var(--ink);
  border-bottom: none;
}
.site-title a:hover { color: var(--accent); }

.site-nav {
  display: flex;
  gap: 1.75rem;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 400;
  letter-spacing: 0.02em;
}

.site-nav a.active {
  color: var(--accent);
  border-bottom: 1px solid var(--accent);
}
.site-nav a:hover { color: var(--ink); }

/* --- Headings --- */
h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.2;
  color: var(--ink);
  letter-spacing: -0.01em;
}

h1 {
  font-size: 2.75rem;
  margin-bottom: 1rem;
  font-weight: 400;
}

h1 em {
  font-style: italic;
  color: var(--accent);
  font-weight: 400;
}

h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 0.75rem;
  font-weight: 500;
}

h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
}

p {
  margin-bottom: 1.1rem;
}

.lead {
  font-size: 1.15rem;
  color: var(--muted);
  margin-bottom: 2.5rem;
  line-height: 1.6;
  max-width: 60ch;
}

/* --- Hero (home page) --- */
.hero {
  padding: 1rem 0 2rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

.hero .kicker {
  display: inline-block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 1rem;
  font-weight: 500;
}

/* --- Home page section cards (FOUR IN ONE ROW) --- */
.section-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.85rem;
  margin-top: 1.5rem;
}

.section-card {
  display: block;
  padding: 1.25rem 1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-elevated);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  color: var(--ink);
  text-align: center;
}

.section-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
  border-color: var(--accent-soft);
  border-bottom-color: var(--accent-soft);
}

.section-card .card-icon {
  font-size: 1.6rem;
  margin-bottom: 0.5rem;
  display: block;
  line-height: 1;
}

.section-card h3 {
  margin: 0 0 0.3rem;
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--ink);
}

.section-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.45;
}

/* Stack cards on tablets → 2 columns, on phones → 1 column */
@media (max-width: 720px) {
  .section-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 420px) {
  .section-grid { grid-template-columns: 1fr; }
}

/* --- "How to add a new entry" info block (appears on list pages) --- */
.how-to-add {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0 2rem;
  font-size: 0.9rem;
  color: #6a3a2e;
  line-height: 1.55;
}

.how-to-add strong {
  display: block;
  font-family: var(--serif);
  font-size: 1rem;
  margin-bottom: 0.35rem;
  color: var(--accent-deep);
}

.how-to-add code {
  background: rgba(255,255,255,0.6);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-size: 0.85em;
}

/* --- Lists (articles, tools) --- */
.entry-list {
  list-style: none;
  margin-top: 1rem;
}

.entry-list li {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--border);
}

.entry-list li:last-child {
  border-bottom: none;
}

.entry-list .entry-title {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 500;
}

.entry-list .entry-date {
  display: block;
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 0.3rem;
}

.entry-list .entry-langs {
  display: inline-block;
  margin-left: 0.75rem;
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--muted);
  vertical-align: middle;
}
.entry-list .entry-langs a {
  color: var(--accent-deep);
}

/* --- Painting gallery --- */
.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

@media (max-width: 600px) {
  .gallery { grid-template-columns: repeat(2, 1fr); }
}

.gallery img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 6px;
  cursor: zoom-in;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  background: #eee;
  box-shadow: var(--shadow);
}

.gallery img:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lift);
}

.gallery .placeholder {
  width: 100%;
  aspect-ratio: 1 / 1;
  border: 2px dashed var(--border);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
  padding: 1rem;
  background: var(--bg-elevated);
}

/* --- Lightbox --- */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(20, 15, 10, 0.92);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  cursor: zoom-out;
  animation: fadeIn 0.2s ease;
}

.lightbox.open { display: flex; }

.lightbox-figure {
  margin: 0;
  max-width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.9rem;
}

.lightbox img {
  max-width: 100%;
  max-height: 80vh;
  border-radius: 6px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.lightbox-caption {
  color: #f1ece2;
  font-family: var(--font-serif, serif);
  font-size: 0.95rem;
  font-style: italic;
  text-align: center;
  max-width: 60ch;
  opacity: 0.9;
  line-height: 1.5;
}

/* Grouped gallery cluster (e.g. multiple photos of a single work) */
.gallery-group {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 0.25rem 0;
  padding: 1rem;
  border: 1px dashed var(--border);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.015);
}

.gallery-group-title {
  font-family: var(--font-serif, serif);
  font-size: 1rem;
  font-style: italic;
  color: var(--muted);
  margin: 0;
}

.gallery-group-items {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

/* Modifier: 4 columns (e.g. 8 photos in a tidy 2-row grid) */
.gallery-group-items--4 {
  grid-template-columns: repeat(4, 1fr);
}

/* Modifier: 2 columns (for pairs of photos) */
.gallery-group-items--2 {
  grid-template-columns: repeat(2, 1fr);
  max-width: 520px;
}

/* Modifier: single photo (shown at a comfortable size, not stretched) */
.gallery-group-items--1 {
  grid-template-columns: 1fr;
  max-width: 320px;
}

@media (max-width: 600px) {
  .gallery-group-items { grid-template-columns: repeat(2, 1fr); }
  .gallery-group-items--4 { grid-template-columns: repeat(2, 1fr); }
}

.gallery-group-items img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 6px;
  cursor: zoom-in;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  background: #eee;
  box-shadow: var(--shadow);
}

.gallery-group-items img:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lift);
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* Inline photo set inside an Other-projects entry */
.project-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-top: 0.85rem;
  max-width: 520px;
}

.project-gallery img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 6px;
  cursor: zoom-in;
  background: #eee;
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.project-gallery img:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lift);
}

/* --- Article body --- */
.article-meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 2rem;
  font-style: italic;
}

article {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 300;
}

article p { margin-bottom: 1.3rem; line-height: 1.75; }

article h2 {
  font-family: var(--serif);
  font-size: 1.3rem;
  margin: 2.5rem 0 1rem;
}

article ul, article ol {
  margin: 0 0 1.3rem 1.5rem;
  line-height: 1.75;
}

article li { margin-bottom: 0.4rem; }

/* Article inline figure (image + caption) */
.article-figure {
  margin: 2rem auto;
  text-align: center;
}

.article-figure img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: var(--shadow);
  margin: 0 auto 0.5rem;
  background: var(--accent-soft);
}

.article-figure figcaption {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--muted);
  font-style: italic;
}

/* Reference list */
.article-refs {
  font-family: var(--sans);
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
}

.article-refs li { margin-bottom: 0.75rem; }
.article-refs a { word-break: break-all; }

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.75rem 0;
  color: var(--muted);
  font-size: 0.82rem;
  text-align: center;
  font-family: var(--sans);
}

/* --- Buttons / back links --- */
.back-link {
  display: inline-block;
  margin-bottom: 1.5rem;
  color: var(--muted);
  font-size: 0.9rem;
  border-bottom: none;
}
.back-link:hover { color: var(--accent); border-bottom: none; }

/* --- Article language toggle (中文 / English) --- */
.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.3rem 0.9rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-family: var(--sans);
  font-size: 0.85rem;
  margin-bottom: 2rem;
}
.lang-toggle strong {
  color: var(--accent-deep);
  font-weight: 500;
}
.lang-toggle a {
  color: var(--muted);
  border-bottom: none;
}
.lang-toggle a:hover {
  color: var(--accent);
}
.lang-toggle .lang-sep {
  color: var(--border);
}

/* --- About-page portrait --- */
.portrait {
  display: block;
  width: 100%;
  height: auto;        /* preserve the image's natural proportions */
  border-radius: 16px; /* rounded rectangle, not a circle */
  box-shadow: var(--shadow-lift);
}

/* Two-column About layout: text on the left, portrait as a right-hand
   sidebar. On narrow screens (phones / small tablets) we stack with
   the portrait on top so the face still greets the visitor first. */
.about-layout {
  display: flex;
  gap: 3rem;
  align-items: flex-start;
  margin-top: 1rem;
}

.about-text {
  flex: 1 1 auto;
  min-width: 0;  /* lets long words wrap inside flex children */
}

.about-sidebar {
  flex: 0 0 240px;
  position: sticky;
  top: 2rem;     /* stays visible while scrolling through the bio */
}

@media (max-width: 720px) {
  .about-layout {
    flex-direction: column-reverse;
    gap: 1.75rem;
  }
  .about-sidebar {
    flex: none;
    position: static;
    max-width: 220px;
    margin: 0 auto;
  }
}

/* --- Embedded tool (iframe) --- */
.tool-note {
  margin: 0.5rem 0 0.85rem;
  color: var(--ink);
  font-size: 0.95rem;
  line-height: 1.55;
  max-width: 62ch;
}

.tool-embed {
  position: relative;
  width: 100%;
  max-width: 960px;
  aspect-ratio: 4 / 3;
  margin-top: 0.5rem;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-lift);
  background: #f0ece4;
}

.tool-embed iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}

@media (max-width: 600px) {
  .tool-embed { aspect-ratio: 3 / 4; }
}

/* --- Coming soon pill --- */
.coming-soon {
  display: inline-block;
  padding: 0.15rem 0.65rem;
  background: var(--accent-soft);
  color: var(--accent-deep);
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 500;
  margin-left: 0.5rem;
  vertical-align: middle;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* --- Mobile tweaks --- */
@media (max-width: 500px) {
  html { font-size: 16px; }
  h1 { font-size: 2rem; }
  .site-header .container { flex-direction: column; align-items: flex-start; gap: 0.75rem; }
  .site-nav { gap: 1rem; }
}