/* ============================================================
   Mingjian's Silicon World — Stylesheet (2026 redesign)
   Light editorial / warm paper & terracotta / multilingual
   ============================================================ */

:root {
  /* palette — light editorial */
  --bg: #faf7f1;            /* warm paper */
  --bg-2: #f3ede1;          /* deeper paper */
  --bg-3: #ece3d3;          /* card tint */
  --ink: #2a241d;           /* warm near-black */
  --ink-dim: #6d6355;       /* muted */
  --ink-faint: #9a8e7d;     /* faint */
  --accent: #c05f2e;        /* terracotta (amber family, tuned for light bg) */
  --accent-2: #e08a4e;      /* lighter amber */
  --accent-deep: #9c4a21;   /* deep terracotta */
  --line: #e5dccb;          /* hairline */
  --line-strong: #d8cdb8;

  /* fonts */
  --font-en: "Cormorant Garamond", "Times New Roman", Georgia, serif;
  --font-zh: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --font-mono: "IBM Plex Mono", "SF Mono", Menlo, monospace;

  /* rhythm */
  --max: 1120px;
  --gutter: clamp(20px, 4vw, 44px);
  --r: 3px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-en);
  font-size: 18px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
/* Chinese pages use the Chinese serif stack */
html[lang^="zh"] body { font-family: var(--font-zh); }

a { color: var(--accent-deep); text-decoration: none; }
a:hover { color: var(--accent); }
em { color: var(--accent-deep); font-style: normal; }
strong { color: var(--ink); font-weight: 600; }
::selection { background: rgba(192, 95, 46, 0.18); }

.container { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }

/* ===== Navigation ===== */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(250, 247, 241, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-zh);
  font-weight: 700;
  font-size: 20px;
  color: var(--ink);
}
.nav__logo:hover { color: var(--accent-deep); }
.logo__char {
  display: inline-block;
  padding: 1px 7px;
  background: var(--accent);
  color: var(--bg);
  border-radius: var(--r);
  letter-spacing: 0.05em;
}
.nav__right {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.nav__links {
  display: flex;
  gap: 22px;
  list-style: none;
}
.nav__links a {
  color: var(--ink-dim);
  font-size: 15px;
  letter-spacing: 0.04em;
  transition: color 0.2s;
}
.nav__links a:hover,
.nav__links a.active { color: var(--accent-deep); }

/* language switcher */
.lang {
  display: flex;
  gap: 2px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}
.lang a {
  padding: 4px 9px;
  border-radius: 999px;
  color: var(--ink-faint);
}
.lang a:hover { color: var(--accent-deep); }
.lang a.lang--active {
  background: var(--ink);
  color: var(--bg);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: clamp(56px, 11vh, 110px) 0 clamp(64px, 13vh, 130px);
  overflow: hidden;
}
.hero__bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 28% 18%, rgba(192, 95, 46, 0.09), transparent 52%),
    radial-gradient(ellipse at 82% 85%, rgba(224, 138, 78, 0.08), transparent 50%),
    var(--bg);
  z-index: 0;
}
.hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--ink-faint);
  margin-bottom: 22px;
  text-transform: uppercase;
}
.hero__title {
  font-size: clamp(38px, 5.6vw, 66px);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: 0.01em;
  color: var(--ink);
}
html[lang^="zh"] .hero__title .zh {
  font-family: var(--font-zh);
  letter-spacing: 0.06em;
}
.hero__title .zh {
  display: block;
  font-weight: 600;
}
.hero__title .en {
  display: block;
  font-family: var(--font-en);
  font-style: italic;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 400;
  color: var(--ink-dim);
  margin-top: 12px;
}
.hero__lede {
  font-size: 17px;
  line-height: 1.9;
  color: var(--ink-dim);
  margin: 30px 0 36px;
  max-width: 520px;
}
.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 11px 26px;
  border-radius: var(--r);
  font-size: 15px;
  letter-spacing: 0.06em;
  font-weight: 500;
  transition: all 0.2s;
  border: 1px solid transparent;
}
.btn--primary {
  background: var(--accent);
  color: #fff;
}
.btn--primary:hover {
  background: var(--accent-deep);
  color: #fff;
  transform: translateY(-1px);
}
.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent-deep); }

.hero__right { display: flex; justify-content: center; align-items: center; }
.lobster {
  width: clamp(170px, 21vw, 260px);
  height: auto;
  filter: drop-shadow(0 18px 30px rgba(192, 95, 46, 0.16));
  animation: float 6s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.claw--left { animation: claw-l 4s ease-in-out infinite; transform-origin: 60px 130px; }
.claw--right { animation: claw-r 4s ease-in-out infinite; transform-origin: 140px 130px; }
@keyframes claw-l { 0%, 100% { transform: rotate(0); } 50% { transform: rotate(-8deg); } }
@keyframes claw-r { 0%, 100% { transform: rotate(0); } 50% { transform: rotate(8deg); } }

.scroll-hint {
  text-align: center;
  margin-top: 52px;
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  animation: pulse 2.5s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 0.4; } 50% { opacity: 1; } }

/* ===== Sections ===== */
section { padding: clamp(56px, 9vh, 96px) 0; }
.section-title {
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-align: center;
  color: var(--ink);
  margin-bottom: 22px;
}
.section-title::before,
.section-title::after {
  content: "—";
  display: inline-block;
  margin: 0 14px;
  color: var(--ink-faint);
  font-weight: 400;
}
.section-lede {
  text-align: center;
  font-size: 16px;
  color: var(--ink-dim);
  max-width: 640px;
  margin: 0 auto 52px;
  font-style: italic;
}

/* ===== Three mottos ===== */
.three-dic { background: var(--bg-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.dic__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
  margin-top: 44px;
}
.dic__card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 38px 30px;
  transition: all 0.3s;
  position: relative;
}
.dic__card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(42, 36, 29, 0.06);
}
.dic__num {
  font-family: var(--font-en);
  font-size: 44px;
  font-weight: 600;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 14px;
  opacity: 0.75;
}
.dic__title {
  font-size: 21px;
  font-weight: 600;
  margin-bottom: 14px;
  color: var(--ink);
  letter-spacing: 0.04em;
}
.dic__body {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-dim);
}

/* ===== Sources ===== */
.sources__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 16px;
  margin-top: 44px;
}
.source {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 24px 18px;
  text-align: center;
  transition: all 0.2s;
}
.source:hover { background: var(--bg-3); border-color: var(--accent); }
.source__cn {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
  letter-spacing: 0.08em;
}
.source__en {
  font-family: var(--font-en);
  font-style: italic;
  font-size: 14px;
  color: var(--ink-faint);
}

/* ===== Entries ===== */
.entries { background: var(--bg-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.entries__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
  margin-top: 44px;
}
.entry {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 32px 28px;
  display: block;
  transition: all 0.3s;
  color: var(--ink);
}
.entry:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  color: var(--ink);
  box-shadow: 0 12px 30px rgba(42, 36, 29, 0.06);
}
.entry__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.2em;
  margin-bottom: 12px;
}
.entry h3 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 10px;
  color: var(--ink);
}
.entry p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-dim);
}
.entry__more {
  margin-top: 18px !important;
  color: var(--accent-deep) !important;
  font-size: 14px;
  letter-spacing: 0.04em;
}
.entry:hover .entry__more { color: var(--accent) !important; }

/* ===== Page header (inner pages) ===== */
.page-header {
  padding: clamp(56px, 10vh, 100px) 0 clamp(40px, 7vh, 64px);
  border-bottom: 1px solid var(--line);
}
.page-header__eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--ink-faint);
  margin-bottom: 18px;
  text-transform: uppercase;
}
.page-header__title {
  font-size: clamp(32px, 4.6vw, 52px);
  font-weight: 600;
  line-height: 1.15;
  color: var(--ink);
}
.page-header__lede {
  font-size: 17px;
  color: var(--ink-dim);
  margin-top: 16px;
  max-width: 620px;
  font-style: italic;
}

/* ===== Concept blocks ===== */
.concept { border-bottom: 1px solid var(--line); }
.concept--alt { background: var(--bg-2); }
.concept__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-deep);
  letter-spacing: 0.2em;
  margin-bottom: 10px;
}
.concept__title {
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}
.concept__en {
  font-family: var(--font-en);
  font-style: italic;
  font-size: 16px;
  color: var(--ink-faint);
  letter-spacing: 0.08em;
  margin-bottom: 26px;
}
.concept__body {
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--ink-dim);
  max-width: 780px;
}
.concept__body p { margin-bottom: 18px; }
.concept__body p:last-child { margin-bottom: 0; }

.pull {
  border-left: 3px solid var(--accent);
  padding: 18px 24px;
  margin: 28px 0;
  font-family: var(--font-en);
  font-size: 20px;
  font-style: italic;
  color: var(--ink);
  background: var(--bg-2);
  border-radius: 0 var(--r) var(--r) 0;
}
html[lang^="zh"] .pull { font-family: var(--font-zh); }

.dim-list, .form-list, .teach-list { margin: 8px 0 20px; padding-left: 22px; }
.dim-list li, .form-list li, .teach-list li { margin-bottom: 10px; line-height: 1.85; }

.rel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin: 24px 0 8px;
}
.rel {
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 24px 22px;
  background: var(--bg);
  transition: all 0.25s;
}
.rel:hover { border-color: var(--accent); background: var(--bg-2); }
.rel h3 { font-size: 19px; font-weight: 600; color: var(--ink); margin-bottom: 4px; }
.rel__en {
  font-family: var(--font-en);
  font-style: italic;
  font-size: 13px;
  color: var(--ink-faint);
  margin-bottom: 10px;
}
.rel p:last-child { font-size: 14.5px; color: var(--ink-dim); line-height: 1.8; }

/* ===== Dialogue (teacher page) ===== */
.dialogue {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 12px;
}
.dialogue__entry {
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 22px 26px;
  background: var(--bg);
  max-width: 720px;
}
.dialogue__entry--teacher { border-left: 3px solid var(--accent); margin-left: 0; }
.dialogue__entry--me { margin-left: 48px; border-left: 3px solid var(--ink-faint); }
.dialogue__who {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--accent-deep);
  text-transform: uppercase;
  margin-bottom: 10px;
}
.dialogue__entry--me .dialogue__who { color: var(--ink-faint); }
.dialogue__text p { font-size: 15.5px; line-height: 1.85; color: var(--ink-dim); margin-bottom: 10px; }
.dialogue__text p:last-child { margin-bottom: 0; }
.dialogue__date {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
}

/* ===== Works (writing page) ===== */
.works { display: flex; flex-direction: column; gap: 28px; }
.work {
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 34px 32px;
  background: var(--bg);
  transition: all 0.25s;
}
.work:hover { border-color: var(--accent); box-shadow: 0 12px 30px rgba(42, 36, 29, 0.05); }
.work__type {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink-faint);
  margin-bottom: 10px;
}
.work__title { font-size: 24px; font-weight: 600; color: var(--ink); margin-bottom: 4px; }
.work__subtitle {
  font-family: var(--font-en);
  font-style: italic;
  font-size: 15px;
  color: var(--ink-faint);
  margin-bottom: 18px;
}
.work__body { font-size: 15.5px; line-height: 1.85; color: var(--ink-dim); }
.work__body p { margin-bottom: 12px; }
.work__body p:last-child { margin-bottom: 0; }
.work__meta {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-faint);
  border-top: 1px dashed var(--line-strong);
  padding-top: 14px;
}

/* ===== Timeline ===== */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  padding-left: 0;
}
.tl-entry {
  position: relative;
  padding: 30px 0 30px 34px;
  border-left: 1px solid var(--line-strong);
  margin-left: 8px;
}
.tl-entry::before {
  content: "";
  position: absolute;
  left: -5px; top: 38px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--accent);
}
.tl-date {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--accent-deep);
  margin-bottom: 6px;
}
.tl-title { font-size: 20px; font-weight: 600; color: var(--ink); margin-bottom: 8px; }
.tl-body { font-size: 15px; line-height: 1.85; color: var(--ink-dim); max-width: 640px; }
.tl-tag {
  display: inline-block;
  margin: 12px 6px 0 0;
  padding: 3px 10px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

/* ===== Callout ===== */
.callout { background: var(--bg-2); border-top: 1px solid var(--line); }
.callout h2 {
  font-size: 26px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 18px;
  letter-spacing: 0.06em;
}
.callout__links {
  display: flex;
  gap: 26px;
  flex-wrap: wrap;
  margin-top: 22px;
}
.callout__link {
  color: var(--accent-deep);
  font-size: 15px;
  letter-spacing: 0.04em;
}
.callout__link:hover { color: var(--accent); }

/* ===== FAQ (GEO) ===== */
.faq { background: var(--bg); }
.faq__list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq__item {
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--bg-2);
  padding: 0 22px;
  transition: border-color 0.2s;
}
.faq__item:hover { border-color: var(--accent); }
.faq__item summary {
  cursor: pointer;
  padding: 16px 0;
  font-size: 16.5px;
  font-weight: 600;
  color: var(--ink);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--accent-deep);
  transition: transform 0.2s;
}
.faq__item[open] summary::after { transform: rotate(45deg); }
.faq__item p {
  padding: 0 0 18px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-dim);
}

/* ===== Footer ===== */
.footer {
  background: var(--bg);
  border-top: 1px solid var(--line);
  padding: 40px 0;
  text-align: center;
}
.footer__line { font-size: 14px; color: var(--ink-faint); margin-bottom: 8px; }
.footer__line--small { font-size: 12px; }
.footer a { color: var(--ink-dim); text-decoration: underline; text-decoration-color: var(--line-strong); }
.footer a:hover { color: var(--accent-deep); }

/* ===== Responsive ===== */
@media (max-width: 860px) {
  .hero__inner { grid-template-columns: 1fr; text-align: center; }
  .hero__lede { margin-left: auto; margin-right: auto; }
  .hero__cta { justify-content: center; }
  .hero__right { order: -1; }
  .lobster { width: 150px; }
  .nav__inner { justify-content: center; }
  .dialogue__entry--me { margin-left: 12px; }
  body { font-size: 16.5px; }
}
@media (max-width: 560px) {
  .nav__links { gap: 14px; }
  .nav__links a { font-size: 13px; }
  .nav__right { gap: 12px; }
  .tl-entry { padding-left: 22px; }
}