/* ==============================================
   Personal Systems — Design Tokens & Base
   ============================================== */
:root {
  --bg:       #0D0D0D;
  --card:     #141210;
  --text:     #E8E4DF;
  --accent:   #C8A96E;
  --muted:    #8A8580;
  --border:   rgba(200, 169, 110, 0.12);

  --font-serif: 'Noto Serif SC', 'Source Han Serif SC', 'STSong', 'SimSun', serif;
  --font-display-cn: 'STXingkai', 'STLiti', 'FZYaoti', 'FZShuTi', 'KaiTi', 'Noto Serif SC', serif;
  --font-display-en: Georgia, 'Times New Roman', 'Noto Serif SC', serif;
  --font-sans:  'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:  'JetBrains Mono', 'SF Mono', 'Consolas', 'Courier New', monospace;

  --max-width:  1120px;
  --gap:        24px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    linear-gradient(rgba(232, 228, 223, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 228, 223, 0.025) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(circle at 50% 20%, black 0%, transparent 68%);
  pointer-events: none;
  z-index: -1;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* Selection */
::selection {
  background: var(--accent);
  color: var(--bg);
}

/* ==============================================
   Typography
   ============================================== */
.manifesto-cn {
  font-family: var(--font-display-cn);
  font-size: clamp(2.1rem, 6vw, 5.25rem);
  font-weight: 400;
  line-height: 1.22;
  letter-spacing: 0.04em;
  color: var(--text);
  text-shadow: 0 18px 54px rgba(0, 0, 0, 0.65);
  max-width: 900px;
}

.manifesto-mark {
  font-family: var(--font-display-cn);
  font-size: clamp(1rem, 2.5vw, 1.45rem);
  line-height: 1.5;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 1.4rem;
  opacity: 0.9;
}

/* ==============================================
   Hero / Origin
   ============================================== */
.hero {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  min-height: 100svh;
  padding: clamp(3rem, 10vh, 8rem) var(--gap);
  overflow: hidden;
}

.language-switch {
  position: absolute;
  top: clamp(1.25rem, 4vw, 2.5rem);
  left: clamp(1.25rem, 4vw, 2.5rem);
  display: inline-flex;
  gap: 0.25rem;
  padding: 0.25rem;
  border: 1px solid rgba(200, 169, 110, 0.16);
  background: rgba(13, 13, 13, 0.62);
  backdrop-filter: blur(16px);
  z-index: 2;
}

.language-button {
  min-width: 2.5rem;
  height: 2rem;
  border: 0;
  background: transparent;
  color: rgba(232, 228, 223, 0.62);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  transition: background 0.2s ease, color 0.2s ease;
}

.language-button:hover,
.language-button.active {
  background: rgba(200, 169, 110, 0.16);
  color: var(--text);
}

/* Subtle warm glow behind the manifesto */
.hero::before {
  content: '';
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: min(800px, 90vw);
  height: min(600px, 70vh);
  background: radial-gradient(ellipse at center, rgba(200, 169, 110, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  right: 12vw;
  bottom: 12vh;
  width: 9rem;
  height: 9rem;
  border: 1px solid rgba(200, 169, 110, 0.14);
  transform: rotate(18deg);
  animation: slow-turn 22s linear infinite;
  pointer-events: none;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  max-width: 960px;
  margin: 0 auto;
  z-index: 1;
}

.hero-links {
  display: flex;
  align-items: center;
  gap: 0.6em;
  margin-top: 2.75rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: rgba(232, 228, 223, 0.72);
}

.hero-links a {
  color: rgba(232, 228, 223, 0.72);
  transition: color 0.25s ease;
}

.hero-links a:hover {
  color: var(--accent);
}

.dot {
  color: var(--accent);
}

/* Right-side vertical metadata */
.hero-meta {
  display: none; /* hidden on mobile, shown on desktop */
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

/* ==============================================
   Section Labels
   ============================================== */
.section-label {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 2.5rem;
}

.label-accent {
  color: var(--accent);
  margin-right: 0.6em;
}

/* ==============================================
   Systems / Showroom
   ============================================== */
.systems {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 5rem var(--gap);
}

.showroom {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  min-height: 34rem;
  perspective: 1200px;
}

.showroom::before {
  content: '';
  position: absolute;
  inset: 12% 8%;
  background: radial-gradient(circle at 50% 50%, rgba(200, 169, 110, 0.13), transparent 62%);
  filter: blur(32px);
  pointer-events: none;
}

.showroom-stage,
.showroom-preview {
  position: relative;
  border: 1px solid var(--border);
  background: linear-gradient(135deg, rgba(20, 18, 16, 0.98), rgba(20, 18, 16, 0.72));
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.34);
}

.showroom-stage {
  z-index: 2;
  min-height: 31rem;
  padding: clamp(1.5rem, 5vw, 3.25rem);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
}

.showroom-stage::before {
  content: '';
  position: absolute;
  inset: 1rem;
  border: 1px solid var(--border);
  pointer-events: none;
}

.showroom-stage::after {
  content: '';
  position: absolute;
  width: 44%;
  height: 1px;
  right: 0;
  top: 32%;
  background: linear-gradient(90deg, transparent, rgba(200, 169, 110, 0.42), transparent);
}

.stage-topline {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 2rem;
}

.showroom-stage h3 {
  font-size: clamp(2.4rem, 6vw, 5.8rem);
  font-weight: 500;
  line-height: 0.95;
  letter-spacing: 0;
  max-width: 760px;
}

.stage-tagline {
  max-width: 620px;
  margin-top: 1.3rem;
  color: rgba(232, 228, 223, 0.72);
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
  line-height: 1.7;
}

.stage-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: 2.4rem 0 2rem;
}

.stage-flow div {
  padding-left: 1rem;
  border-left: 1px solid rgba(200, 169, 110, 0.28);
}

.stage-flow dt {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.stage-flow dd {
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.55;
}

.stage-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.stage-links a {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent);
  border-bottom: 1px solid rgba(200, 169, 110, 0.35);
  transition: color 0.25s ease;
}

.stage-links a:hover {
  color: var(--text);
}

/* Detail toggle & panel */
.detail-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
  padding: 0.5rem 1rem;
  border: 1px solid rgba(200, 169, 110, 0.28);
  background: transparent;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background 0.25s ease, color 0.25s ease;
  width: fit-content;
}

.detail-toggle:hover {
  background: rgba(200, 169, 110, 0.12);
  color: var(--text);
}

.toggle-icon {
  font-size: 0.9rem;
  line-height: 1;
}

.detail-panel {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  overflow: hidden;
}

.detail-panel[hidden] {
  display: none;
}

.detail-panel dl {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.detail-panel dl > div {
  padding-left: 1rem;
  border-left: 1px solid rgba(200, 169, 110, 0.28);
}

.detail-panel dt {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.detail-panel dd {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
}

.showroom-preview {
  appearance: none;
  border-radius: 0;
  padding: 1rem;
  min-height: 9rem;
  color: var(--text);
  cursor: pointer;
  text-align: left;
  opacity: 0.76;
  transition: opacity 0.25s ease, transform 0.25s ease, border-color 0.25s ease;
}

.showroom-preview:hover {
  opacity: 1;
  transform: translateY(-3px);
  border-color: rgba(200, 169, 110, 0.32);
}

.preview-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
}

.showroom-preview strong {
  display: block;
  font-size: 1.05rem;
  font-weight: 500;
  margin-bottom: 0.45rem;
}

.showroom-preview span:last-child {
  display: block;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.45;
}

.showroom-controls {
  display: flex;
  justify-content: center;
  gap: 0.65rem;
  z-index: 3;
}

.gallery-dot {
  width: 2.5rem;
  height: 0.25rem;
  border: 0;
  background: rgba(232, 228, 223, 0.18);
  cursor: pointer;
  transition: background 0.2s ease, width 0.2s ease;
}

.gallery-dot.active {
  width: 4.5rem;
  background: var(--accent);
}

.showroom-stage.is-switching {
  animation: stage-enter 0.42s ease both;
}

/* ==============================================
   Current Status
   ============================================== */
.status {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 5rem var(--gap);
}

.status-card {
  position: relative;
  max-width: 720px;
  padding: 2rem;
  border: 1px solid var(--border);
  background: linear-gradient(135deg, rgba(20, 18, 16, 0.98), rgba(20, 18, 16, 0.62));
}

.status-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  padding: 0.25em 0.75em;
  border: 1px solid rgba(200, 169, 110, 0.28);
  margin-bottom: 1.25rem;
}

.status-body {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2vw, 1.2rem);
  line-height: 1.8;
  color: rgba(232, 228, 223, 0.78);
}

/* ==============================================
   Lab Notes
   ============================================== */
.labnotes {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 5rem var(--gap);
}

.labnotes-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.labnote-card {
  position: relative;
  min-height: 13rem;
  padding: 1.4rem;
  border: 1px solid var(--border);
  background: rgba(20, 18, 16, 0.72);
}

.labnote-index {
  display: block;
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.78rem;
  margin-bottom: 2rem;
}

.labnote-card h3 {
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.labnote-card p {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* ==============================================
   How I Build / Method
   ============================================== */
.method {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 5rem var(--gap);
}

.method-hero {
  position: relative;
  padding-bottom: 2rem;
}

.method-statement {
  font-family: var(--font-display-cn);
  font-size: clamp(1.65rem, 4vw, 3rem);
  font-weight: 400;
  line-height: 1.42;
  color: var(--text);
  max-width: 760px;
}

.method-classic {
  font-family: var(--font-display-cn);
  font-size: clamp(1rem, 2.2vw, 1.35rem);
  letter-spacing: 0.16em;
  color: var(--accent);
  margin-bottom: 1rem;
}

.method-note {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2vw, 1.2rem);
  line-height: 1.75;
  color: rgba(232, 228, 223, 0.62);
  max-width: 720px;
  margin-top: 1.15rem;
}

.method-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 3rem;
}

.method-card {
  position: relative;
  min-height: 13rem;
  padding: 1.4rem;
  border: 1px solid var(--border);
  background: rgba(20, 18, 16, 0.72);
  overflow: hidden;
}

.method-card::after {
  content: '';
  position: absolute;
  inset: auto 1.4rem 1.4rem auto;
  width: 2.4rem;
  height: 2.4rem;
  border-right: 1px solid rgba(200, 169, 110, 0.26);
  border-bottom: 1px solid rgba(200, 169, 110, 0.26);
}

.method-card span {
  display: block;
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.78rem;
  margin-bottom: 2.4rem;
}

.method-card h3 {
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.method-card p {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

.workflow-map {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 2rem;
  isolation: isolate;
}

.workflow-map::before {
  content: '';
  position: absolute;
  top: 2rem;
  left: 1.6rem;
  bottom: 2rem;
  width: 1px;
  background: linear-gradient(180deg, rgba(200, 169, 110, 0.25), rgba(200, 169, 110, 0.1), transparent);
  z-index: 0;
  pointer-events: none;
}

.workflow-node {
  position: relative;
  min-height: 12rem;
  padding: 1.2rem;
  border: 1px solid rgba(200, 169, 110, 0.16);
  background:
    linear-gradient(135deg, rgba(20, 18, 16, 0.9), rgba(20, 18, 16, 0.54));
  z-index: 1;
}

.workflow-node:not(:last-child)::before {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -0.7rem;
  width: 0.5rem;
  height: 0.5rem;
  border-right: 1px solid rgba(200, 169, 110, 0.4);
  border-bottom: 1px solid rgba(200, 169, 110, 0.4);
  transform: translateX(-50%) rotate(45deg);
  z-index: 2;
}

.workflow-node::after {
  content: '';
  position: absolute;
  left: 1.2rem;
  right: 1.2rem;
  bottom: 1rem;
  height: 1px;
  background: linear-gradient(90deg, rgba(200, 169, 110, 0.62), transparent);
}

.workflow-node span {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  margin-bottom: 2rem;
}

.workflow-node h3 {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 0.65rem;
}

.workflow-node p {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.55;
}

.keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.5rem;
}

.keywords li {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent);
  padding: 0.4em 1em;
  border: 1px solid rgba(200, 169, 110, 0.25);
  border-radius: 100px;
  letter-spacing: 0.03em;
}

/* ==============================================
   Tools
   ============================================== */
.tools {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 5rem var(--gap);
}

.tool-groups {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.tool-group {
  padding: 1.35rem;
  border: 1px solid var(--border);
  background: rgba(20, 18, 16, 0.68);
}

.tool-group h3 {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.tool-group ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.tool-group li {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: rgba(232, 228, 223, 0.76);
  padding: 0.35rem 0.7rem;
  border: 1px solid rgba(232, 228, 223, 0.1);
  background: rgba(13, 13, 13, 0.4);
}

/* ==============================================
   Connect / Footer
   ============================================== */
.connect {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 5rem var(--gap) 4rem;
}

.connect-links {
  display: flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.connect-links a {
  color: var(--muted);
  transition: color 0.25s ease;
}

.connect-links a:hover {
  color: var(--accent);
}

.signature {
  font-size: 0.875rem;
  color: var(--muted);
  opacity: 0.7;
}

/* ==============================================
   Fade-Up Animation
   ============================================== */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==============================================
   Responsive — Tablet ≥768px
   ============================================== */
@media (min-width: 768px) {
  :root { --gap: 32px; }

  .stage-flow {
    grid-template-columns: repeat(3, 1fr);
  }

  .method-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .labnotes-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .detail-panel dl {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero {
    padding: clamp(4rem, 12vh, 10rem) var(--gap);
  }

  .workflow-map {
    grid-template-columns: repeat(5, 1fr);
    gap: 1.25rem;
    margin-top: 2.5rem;
  }

  .workflow-map::before {
    top: 0.9rem;
    left: 3%;
    right: 3%;
    bottom: auto;
    width: auto;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(200, 169, 110, 0.22), transparent);
  }

  .workflow-node:not(:last-child)::before {
    top: 50%;
    bottom: auto;
    left: auto;
    right: -1.35rem;
    width: 0.45rem;
    height: 0.45rem;
    border-right: 1.5px solid rgba(200, 169, 110, 0.5);
    border-bottom: 1.5px solid rgba(200, 169, 110, 0.5);
    transform: translateY(-50%) rotate(-45deg);
  }

  .workflow-node:not(:last-child)::after {
    top: 50%;
    bottom: auto;
    left: auto;
    right: -1.15rem;
    width: 0.9rem;
    height: 1.5px;
    background: rgba(200, 169, 110, 0.5);
    transform: translateY(-50%);
  }

  .tool-groups {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 560px) {
  .hero {
    padding-top: 6rem;
  }

  .hero-links,
  .connect-links {
    flex-direction: column;
    gap: 0.35rem;
  }

  .hero-links .dot,
  .connect-links .dot {
    display: none;
  }
}

/* ==============================================
   Responsive — Desktop ≥1024px
   ============================================== */
@media (min-width: 1024px) {
  :root { --gap: 40px; }

  /* Hero: content centered + metadata on the right */
  .hero {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .hero-content {
    grid-column: 1;
    grid-row: 1;
    margin: 0 auto;
  }

  .hero-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.5em;
    grid-column: 2;
    grid-row: 1;
    padding-right: var(--gap);
    writing-mode: vertical-rl;
    text-orientation: mixed;
    z-index: 1;
  }

  .meta-sep {
    display: none; /* vertical layout needs no separators */
  }

  .showroom {
    grid-template-columns: minmax(8rem, 0.34fr) minmax(0, 1fr) minmax(8rem, 0.34fr);
    align-items: center;
  }

  .showroom-stage {
    grid-column: 2;
    grid-row: 1;
  }

  .showroom-preview {
    min-height: 21rem;
  }

  .showroom-preview.prev {
    grid-column: 1;
    transform: rotateY(12deg) translateX(1rem);
  }

  .showroom-preview.next {
    grid-column: 3;
    transform: rotateY(-12deg) translateX(-1rem);
  }

  .showroom-preview.prev:hover,
  .showroom-preview.next:hover {
    transform: translateY(-3px);
  }

  .showroom-controls {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .systems,
  .method,
  .tools,
  .connect {
    padding-left: var(--gap);
    padding-right: var(--gap);
  }
}

/* ==============================================
   Responsive — Large Desktop ≥1440px
   ============================================== */
@media (min-width: 1440px) {
  :root {
    --max-width: 1200px;
    --gap: 48px;
  }

}

/* ==============================================
   Reduced Motion
   ============================================== */
@media (prefers-reduced-motion: reduce) {
  .fade-up {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero::after,
  .showroom-stage.is-switching {
    animation: none;
  }
}

@keyframes slow-turn {
  from { transform: rotate(18deg); }
  to { transform: rotate(378deg); }
}

@keyframes stage-enter {
  from {
    opacity: 0.65;
    transform: translateY(10px) scale(0.985);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}