/* ═══════════════════════════════════════════════════════
   style.css — Shared stylesheet for cindyzeng.com
   Design references: ribo.zone (typography, spacing, nav)
                      omori-game.com (atmosphere, animation)
   ═══════════════════════════════════════════════════════ */

/* ── Custom Properties ── */
:root {
  /* Colors — warm, high-contrast */
  --color-bg:       #fefdf8;
  --color-text:     #1a1a1a;
  --color-muted:    #5a5a5a;
  --color-accent:   #5a6b2a;
  --color-rule:     #cfc9b8;
  --color-card-bg:  #fffef7;

  /* Typography */
  --font-serif:     Garamond, "EB Garamond", "Songti SC", "Noto Serif CJK SC", "Times New Roman", serif;
  --font-sans:      Helvetica, "Helvetica Neue", Arial, sans-serif;
  --font-mono:      "SF Mono", "Cascadia Code", Consolas, monospace;

  --text-base:      18px;
  --text-sm:        0.88rem;
  --text-xs:        0.78rem;
  --text-lg:        1.25rem;
  --text-xl:        1.6rem;
  --text-2xl:       36px;

  --leading:        1.72;
  --measure:         680px;   /* max width for readable body text */

  /* Spacing */
  --space-xs:       0.4rem;
  --space-sm:       0.8rem;
  --space-md:       1.5rem;
  --space-lg:       2.5rem;
  --space-xl:       4rem;

  /* Header */
  --header-height:  3.5rem;

  /* Borders & Shadows */
  --border:         1px solid var(--color-rule);
  --shadow-sm:      0 1px 4px rgba(0,0,0,0.04);
  --shadow-md:      0 4px 16px rgba(0,0,0,0.08);

  /* Room scene (homepage illustration) */
  --room-wall:       #f1ecdf;
  --room-floor:      #e6dfc9;
  --room-line:       #d8d0bb;
  --room-rug:        #ded6c0;
  --room-wood:       #a07a4e;
  --room-wood-dark:  #7d5f3c;
  --room-leaf:       #5a6b2a;
  --room-leaf-dark:  #465420;
  --room-orange:     #dd8a3c;
  --room-seal:       #b8442e;
  --room-screen:     #2b3a55;
  --room-screen-hi:  #3b4f73;
  --room-code:       #5b7ba6;
  --room-glass:      #dbe4ee;
  --room-paper:      #ece6d4;

  /* Transitions */
  --ease:           0.25s ease;
  --ease-slow:      0.6s ease;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  background-color: var(--color-bg);
  background-image: url("../assets/images/xuanzhi-texture.jpg");
  background-repeat: repeat;
  color: var(--color-text);
  line-height: var(--leading);
  padding-top: var(--header-height);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1 { font-size: 36px; }

/* ── Header ── */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; justify-content: space-between; align-items: center;
  height: var(--header-height);
  padding: 0 var(--space-lg);
  background: transparent;
  transition: background var(--ease);
}
.site-header.scrolled { background: color-mix(in srgb, var(--color-bg) 92%, transparent); }
.site-title {
  font-family: var(--font-serif); font-size: var(--text-lg); font-weight: 600;
  color: var(--color-text); text-decoration: none;
}
.site-nav { display: flex; gap: var(--space-lg); }
.site-nav a {
  font-family: var(--font-serif); font-size: var(--text-sm); font-weight: 400;
  color: var(--color-muted); text-decoration: none;
  letter-spacing: 0.02em;
  transition: color var(--ease);
}
.site-nav a:hover,
.site-nav a.active { color: var(--color-text); }
.site-nav a.active { text-decoration: underline; text-underline-offset: 4px; }

/* Minimal header (intro pages) */
.header-minimal { justify-content: center; }
.header-minimal .site-title { font-size: var(--text-xl); }

/* ── Footer ── */
.site-footer {
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: var(--space-sm);
  padding: var(--space-lg);
  margin-top: var(--space-xl);
  border-top: var(--border);
  font-size: var(--text-xs); color: var(--color-muted);
}
.footer-bio { font-style: italic; }
.footer-links { display: flex; gap: var(--space-md); }
.footer-links a { color: var(--color-muted); text-decoration: none; }
.footer-links a:hover { color: var(--color-text); }
.back-to-top { color: var(--color-muted); text-decoration: none; }

/* ── Homepage ── */
.homepage { max-width: 900px; margin: 0 auto; padding: var(--space-xl) var(--space-md); }
.hero { text-align: center; padding: var(--space-xl) 0; }
.hero h1 { font-size: var(--text-2xl); font-weight: 600; }
.tagline { font-size: var(--text-lg); color: var(--color-muted); margin-top: var(--space-sm); }
.section-cards { display: flex; gap: var(--space-md); justify-content: center; flex-wrap: wrap; margin: var(--space-lg) 0; }
.section-card {
  display: block; flex: 1; min-width: 200px; max-width: 280px;
  padding: var(--space-lg) var(--space-md);
  background: var(--color-card-bg); border: var(--border); border-radius: 6px;
  text-decoration: none; color: var(--color-text); box-shadow: var(--shadow-sm);
  transition: transform var(--ease), box-shadow var(--ease);
}
.section-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.section-card h2 { font-size: 24px; margin-bottom: var(--space-xs); }
.section-card p { font-size: var(--text-sm); color: var(--color-muted); }
.homepage-extras { text-align: center; margin-top: var(--space-xl); }
.orange-tree-icon { font-size: 2rem; margin-bottom: var(--space-sm); cursor: default; }
.about-preview { font-size: var(--text-sm); }
.about-preview a { color: var(--color-accent); text-decoration: none; }
@keyframes pulse { 0%,100% { opacity: 0.4; } 50% { opacity: 1; } }

/* ── Writing Index ── */
.writing-index { max-width: var(--measure); margin: 0 auto; padding: var(--space-xl) var(--space-md); }
.writing-index h1 { font-size: var(--text-2xl); margin-bottom: var(--space-md); }
.category-filters { display: flex; gap: var(--space-sm); flex-wrap: wrap; margin-bottom: var(--space-lg); }
.filter {
  font-family: var(--font-sans); font-size: var(--text-xs); font-weight: 600;
  padding: 0.25em 0.7em; border: var(--border); border-radius: 20px;
  background: transparent; color: var(--color-muted); cursor: pointer;
  letter-spacing: 0.04em; text-transform: uppercase;
  transition: background var(--ease), color var(--ease);
}
.filter:hover, .filter.active { background: var(--color-text); color: var(--color-bg); border-color: var(--color-text); }
.writing-list { list-style: none; }
.writing-entry { padding: var(--space-md) 0; border-bottom: 1px dotted var(--color-rule); transition: transform var(--ease), box-shadow var(--ease); }
.writing-entry:hover { transform: translateY(-3px); box-shadow: var(--shadow-sm); }

/* Scroll-driven reveal (Plan #2) — progressive enhancement */
@keyframes writing-reveal {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}
@supports (animation-timeline: view()) {
  .writing-entry,
  .gallery-item {
    animation: writing-reveal linear backwards;
    animation-timeline: view();
    animation-range: entry 5% entry 95%;
  }
}
.writing-title { font-size: var(--text-lg); font-weight: 600; color: var(--color-text); text-decoration: none; display: block; }
.writing-title:hover { color: var(--color-accent); }
.writing-date { font-size: var(--text-xs); color: var(--color-muted); margin-right: var(--space-sm); }
.writing-category {
  font-size: var(--text-xs); font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.04em; color: var(--color-accent);
}
.writing-excerpt {
  font-size: var(--text-sm); color: var(--color-muted); margin-top: var(--space-xs);
  display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden;
}

/* ── Individual Writing Piece ── */
.writing-piece { max-width: var(--measure); margin: 0 auto; padding: var(--space-xl) var(--space-md); }
.piece-header { margin-bottom: var(--space-lg); }
.piece-title { font-size: var(--text-2xl); font-weight: 600; }
.piece-meta { font-size: var(--text-sm); color: var(--color-muted); margin-top: var(--space-xs); }
.piece-meta time { margin-right: var(--space-sm); }
.piece-category {
  font-size: var(--text-xs); font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.04em; color: var(--color-accent);
}
.piece-body { font-size: var(--text-base); line-height: 1.75; }
.piece-body p + p { margin-top: 1em; text-indent: 0; }
.piece-body h2 { font-size: 24px; font-weight: 600; margin: 1.75em 0 0.6em; }
.piece-body blockquote {
  margin: var(--space-md) 0 var(--space-lg) 2em;
  padding-left: var(--space-md);
  border-left: 2px solid var(--color-rule);
  color: var(--color-muted);
}
.piece-body ul { margin: 0.5em 0 1em; padding-left: 2em; }
.piece-body sup { font-size: 0.75em; line-height: 0; }
.piece-body sup a { text-decoration: none; color: var(--color-accent); }
.piece-body sup a:hover { color: var(--color-text); }
.piece-body .section-break { margin: var(--space-lg) 0; text-align: center; color: var(--color-muted); }
.piece-endnotes,
.piece-bibliography {
  margin-top: var(--space-xl);
  padding-top: var(--space-md);
  border-top: var(--border);
}
.piece-endnotes h2,
.piece-bibliography h2 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 0.6em;
}
.notes-list,
.bibliography-list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: var(--text-sm);
  line-height: 1.55;
}
.notes-list { counter-reset: note; }
.notes-list li {
  counter-increment: note;
  text-indent: 1.5em;
  margin-bottom: 0.35em;
}
.notes-list li::before { content: counter(note) ". "; }
.bibliography-list li {
  padding-left: 2em;
  text-indent: -2em;
  margin-bottom: 0.6em;
}
.piece-nav { margin-top: var(--space-xl); padding-top: var(--space-md); border-top: var(--border); font-size: var(--text-sm); }
.piece-nav a { color: var(--color-muted); text-decoration: none; }
.piece-nav a:hover { color: var(--color-text); }

/* ── Carving Gallery ── */
.carving-gallery { max-width: 1000px; margin: 0 auto; padding: var(--space-xl) var(--space-md); }
.carving-gallery h1 { font-size: var(--text-2xl); margin-bottom: var(--space-md); }
.gallery-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 1rem; margin-top: var(--space-md); }
@media (max-width: 899px) { .gallery-grid { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 599px) { .gallery-grid { grid-template-columns: 1fr; } }
.gallery-item {
  position: relative; overflow: hidden; border-radius: 4px;
  cursor: pointer; aspect-ratio: 1; background: var(--color-rule);
}
.gallery-item img { width: 100%; height: 100%; object-fit: cover; display: block; }
.gallery-overlay {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  justify-content: flex-end; padding: var(--space-md);
  background: linear-gradient(transparent 40%, rgba(0,0,0,0.6));
  opacity: 0; transition: opacity 0.2s ease;
}
.gallery-item:hover .gallery-overlay,
.gallery-item:focus-visible .gallery-overlay { opacity: 1; }
.gallery-item:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
.gallery-overlay h3 { color: #fff; font-size: var(--text-sm); font-weight: 600; }
.gallery-overlay p { color: rgba(255,255,255,0.75); font-size: var(--text-xs); }

/* Lightbox */
.lightbox {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(0,0,0,0.88); display: flex; flex-direction: column;
  align-items: center; justify-content: center; padding: var(--space-lg);
  opacity: 0; visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}
.lightbox.open { opacity: 1; visibility: visible; }
.lightbox-close {
  position: absolute; top: var(--space-md); right: var(--space-md);
  background: none; border: none; color: #fff; font-size: 2rem;
  cursor: pointer; line-height: 1;
}
.lightbox-image { max-width: 90vw; max-height: 70vh; object-fit: contain; border-radius: 4px; }
.lightbox-info { margin-top: var(--space-md); text-align: center; color: rgba(255,255,255,0.85); max-width: 500px; }
.lightbox-title { font-size: var(--text-lg); }
.lightbox-meta { font-size: var(--text-sm); margin-top: var(--space-xs); }
.lightbox-notes { font-size: var(--text-sm); margin-top: var(--space-sm); }

/* ── Video Game Intro Screen ── */
.videogame-intro { padding-top: 0; background: #1a1a1a; color: #e0d8c8; }
.videogame-intro .site-header { background: transparent; }
.videogame-intro .site-title { color: #e0d8c8; }
.game-intro-screen {
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  min-height: 100vh; text-align: center; padding: var(--space-md);
}
.game-title { font-size: 36px; font-weight: 600; }
.game-subtitle { font-size: var(--text-lg); color: rgba(224,216,200,0.6); margin-top: var(--space-sm); }
.game-prompt { font-size: var(--text-sm); color: rgba(224,216,200,0.5); margin-top: var(--space-xl); animation: pulse 2s ease-in-out infinite; }

/* ── Script Showcase ── */
.script-showcase { max-width: var(--measure); margin: 0 auto; padding: var(--space-xl) var(--space-md); }
.script-showcase h1 { font-size: var(--text-2xl); margin-bottom: var(--space-xs); }
.script-subtitle { font-size: var(--text-sm); color: var(--color-muted); margin-bottom: var(--space-lg); }
.script-body { font-family: var(--font-serif); line-height: 1.8; }

/* ── About Page ── */
.about-page { max-width: var(--measure); margin: 0 auto; padding: var(--space-xl) var(--space-md); }
.about-page h1 { font-size: var(--text-2xl); margin-bottom: var(--space-lg); }
.about-page section { margin-bottom: var(--space-lg); }
.about-page h2 { font-size: 24px; margin-bottom: var(--space-sm); }
.about-photo { max-width: 200px; border-radius: 50%; margin-bottom: var(--space-md); }
.about-contact ul { list-style: none; }
.about-contact li { font-size: var(--text-sm); margin-bottom: var(--space-xs); }

/* ── Shared: Empty State ── */
.empty-state { color: var(--color-muted); font-style: italic; text-align: center; padding: var(--space-xl); }

/* ── Hamburger Menu (Mobile) ── */
@media (max-width: 640px) {
  :root { --header-height: 3rem; }
  .site-header { padding: 0 var(--space-md); }
  .site-nav { display: none; }
  .site-nav.open { display: flex; flex-direction: column; position: absolute; top: var(--header-height); right: 0; background: var(--color-bg); border: var(--border); padding: var(--space-md); gap: var(--space-sm); border-radius: 0 0 6px 6px; box-shadow: var(--shadow-md); }
  .hamburger { display: block; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--color-text); }
}
@media (min-width: 641px) { .hamburger { display: none; } }

/* ── Homepage: Room Scene ── */
.room { width: 100%; max-width: 1080px; margin: 0 auto; padding: var(--space-lg) var(--space-md) var(--space-xl); flex: 1 0 auto; display: flex; flex-direction: column; justify-content: center; }
.room-heading { text-align: center; margin-bottom: var(--space-md); }
.room-heading h1 { font-size: var(--text-2xl); font-weight: 600; }
.room-heading p { font-size: var(--text-lg); color: var(--color-muted); margin-top: var(--space-xs); }
.room-scene { width: 100%; height: auto; display: block; }

.room-object { cursor: pointer; outline: none; }
.room-object .obj {
  transition: transform var(--ease-slow), filter var(--ease);
  transform-box: fill-box; transform-origin: 50% 100%;
}
.room-object:hover .obj,
.room-object:focus-visible .obj { transform: translateY(-6px); filter: saturate(1.08); }
.room-object .room-label { opacity: 0; transition: opacity var(--ease); pointer-events: none; }
.room-object:hover .room-label,
.room-object:focus-visible .room-label { opacity: 1; }
.room-label .lbl-pill { fill: var(--color-text); }
.room-label text {
  fill: var(--color-bg); font-family: var(--font-sans);
  font-size: 18px; font-weight: 600; letter-spacing: 0.02em;
}

/* Ambient animation */
.mote { animation: mote-float 9s ease-in-out infinite; }
.mote.m2 { animation-duration: 13s; animation-delay: 2s; }
.mote.m3 { animation-duration: 11s; animation-delay: 4s; }
@keyframes mote-float {
  0%, 100% { transform: translateY(0); opacity: 0; }
  50% { transform: translateY(-38px); opacity: 0.5; }
}
.tree-canopy { transform-box: fill-box; transform-origin: 50% 100%; animation: sway 7s ease-in-out infinite; }
@keyframes sway {
  0%, 100% { transform: rotate(-0.8deg); }
  50% { transform: rotate(0.8deg); }
}
.mirror-glint { animation: glint 6s ease-in-out infinite; }
@keyframes glint {
  0%, 100% { opacity: 0.15; }
  50% { opacity: 0.55; }
}