:root {
  color-scheme: dark;
  --bg: #080b10;
  --panel: rgba(13, 20, 28, 0.78);
  --text: #eef4f8;
  --muted: #9aaebd;
  --line: rgba(255, 255, 255, 0.13);
  --accent: #f2b35e;
  --accent-2: #54d6c6;
  --ink: #111923;
  --shadow: rgba(0, 0, 0, 0.34);
}

body.light {
  color-scheme: light;
  --bg: #f6f3ed;
  --panel: rgba(255, 255, 255, 0.82);
  --text: #17202a;
  --muted: #5d6b75;
  --line: rgba(18, 31, 42, 0.14);
  --ink: #ffffff;
  --shadow: rgba(40, 42, 45, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
  line-height: 1.75;
  overflow-x: hidden;
}

#logic-canvas {
  position: fixed;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(8, 11, 16, 0.95), rgba(8, 11, 16, 0.58) 45%, rgba(8, 11, 16, 0.9)),
    radial-gradient(circle at 72% 18%, rgba(84, 214, 198, 0.18), transparent 30%),
    radial-gradient(circle at 22% 78%, rgba(242, 179, 94, 0.14), transparent 28%);
  pointer-events: none;
}

body.light::before {
  background:
    linear-gradient(90deg, rgba(246, 243, 237, 0.9), rgba(246, 243, 237, 0.62), rgba(246, 243, 237, 0.92)),
    radial-gradient(circle at 72% 18%, rgba(84, 214, 198, 0.16), transparent 30%),
    radial-gradient(circle at 22% 78%, rgba(242, 179, 94, 0.18), transparent 28%);
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px clamp(18px, 5vw, 68px);
  background: color-mix(in srgb, var(--bg) 74%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  letter-spacing: 0;
  white-space: nowrap;
}

.brand-mark span {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #111923;
  border-radius: 8px;
}

nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 3vw, 34px);
  color: var(--muted);
  font-size: 0.95rem;
}

nav a:hover {
  color: var(--text);
}

.icon-button,
.secondary-action,
.primary-action,
.stack-item,
.time-dot,
.workflow-board button,
.tag-cloud button {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: color-mix(in srgb, var(--panel) 84%, transparent);
  color: var(--text);
  font: inherit;
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.icon-button {
  width: 44px;
  display: grid;
  place-items: center;
}

.primary-action:hover,
.secondary-action:hover,
.icon-button:hover,
.stack-item:hover,
.time-dot:hover,
.workflow-board button:hover,
.tag-cloud button:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--accent) 72%, var(--line));
}

.progress-rail {
  position: fixed;
  top: 50%;
  left: clamp(16px, 2vw, 28px);
  z-index: 10;
  display: grid;
  gap: 10px;
  justify-items: center;
  color: var(--muted);
  font-size: 0.78rem;
  transform: translateY(-50%);
}

.progress-rail div {
  width: 2px;
  height: 180px;
  background: var(--line);
  overflow: hidden;
}

.progress-rail i {
  display: block;
  width: 100%;
  height: 0%;
  background: linear-gradient(var(--accent), var(--accent-2));
}

main {
  width: min(1180px, calc(100% - 42px));
  margin: 0 auto;
  padding: 96px 0 40px;
}

.panel {
  min-height: 100vh;
  display: grid;
  align-items: center;
  padding: clamp(70px, 9vw, 128px) 0;
  scroll-margin-top: 80px;
}

.panel > * {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 700ms ease, transform 700ms ease;
}

.panel.in-view > * {
  opacity: 1;
  transform: translateY(0);
}

.hero {
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  gap: clamp(28px, 5vw, 70px);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-2);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 10px;
  font-size: clamp(4.4rem, 15vw, 11rem);
  line-height: 0.92;
  letter-spacing: 0;
  color: var(--text);
}

h2 {
  max-width: 850px;
  margin-bottom: 22px;
  font-size: clamp(2.1rem, 5.4vw, 5.4rem);
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
  font-size: 1.1rem;
}

.hero-line {
  font-size: clamp(1.2rem, 3vw, 2rem);
  color: var(--accent);
  font-weight: 800;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.38);
}

.hero-text,
.panel p {
  max-width: 700px;
  color: var(--muted);
  font-size: clamp(1rem, 1.5vw, 1.15rem);
}

.hero-copy .hero-text,
.hero-copy .eyebrow {
  color: color-mix(in srgb, var(--text) 82%, var(--muted));
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.38);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  font-weight: 800;
}

.primary-action {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #111923;
  border: 0;
}

.hero-visual {
  position: relative;
  min-height: 460px;
}

.hero-visual img {
  width: 100%;
  height: min(68vh, 680px);
  min-height: 420px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--line);
  box-shadow: 0 30px 80px var(--shadow);
}

.floating-card {
  position: absolute;
  right: 18px;
  bottom: 24px;
  display: grid;
  gap: 4px;
  width: min(280px, calc(100% - 36px));
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(8, 11, 16, 0.78);
  backdrop-filter: blur(16px);
}

.floating-card span {
  color: #d6e3ea;
  font-size: 0.92rem;
}

.split,
.blueprint {
  grid-template-columns: minmax(0, 0.9fr) minmax(300px, 0.8fr);
  gap: clamp(28px, 6vw, 78px);
}

.blueprint {
  grid-template-columns: minmax(0, 860px);
}

.stack-list,
.compare-box,
.prompt-card,
.checklist,
.output-list,
.audience-grid {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 22px 60px var(--shadow);
}

.stack-list {
  display: grid;
  gap: 10px;
  padding: 16px;
}

.stack-item {
  width: 100%;
  padding: 12px 14px;
  text-align: left;
}

.stack-item.is-active,
.time-dot.is-active,
.workflow-board button.is-active {
  border-color: var(--accent-2);
  background: color-mix(in srgb, var(--accent-2) 18%, var(--panel));
}

#stack-detail {
  min-height: 72px;
  margin: 10px 0 0;
  padding: 14px;
  border-top: 1px solid var(--line);
}

.method-grid,
.case-grid,
.workflow-board {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.method-grid article,
.case-grid article,
.output-list article,
.audience-grid article {
  min-height: 190px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.method-grid span {
  color: var(--accent);
  font-weight: 900;
}

pre {
  margin: 0;
}

code {
  color: var(--accent-2);
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: clamp(0.9rem, 1.5vw, 1.05rem);
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  max-width: 820px;
}

.tag-cloud button {
  padding: 0 16px;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  max-width: 900px;
  margin-top: 30px;
}

.time-dot {
  padding: 14px;
}

.timeline-copy,
#workflow-output {
  min-height: 80px;
  margin-top: 22px;
  padding: 18px;
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--panel) 70%, transparent);
}

.case-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.compare-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  overflow: hidden;
}

.compare-box div {
  padding: 26px;
  background: color-mix(in srgb, var(--panel) 90%, transparent);
}

.compare-box b {
  color: var(--accent);
}

.workflow-board {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 900px;
}

.workflow-board button {
  padding: 18px;
  text-align: left;
}

.prompt-card {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  max-width: 980px;
}

.prompt-card span {
  display: grid;
  place-items: center;
  min-height: 110px;
  padding: 12px;
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  color: var(--text);
  font-weight: 900;
}

.checklist-panel {
  grid-template-columns: minmax(0, 1fr);
}

.checklist {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  max-width: 860px;
  padding: 18px;
}

.checklist label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  min-height: 52px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent-2);
  margin-top: 4px;
}

.score {
  margin-top: 18px;
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--accent);
}

.output-list,
.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  max-width: 980px;
}

.quote-panel {
  justify-items: center;
}

blockquote {
  max-width: 880px;
  margin: 0;
  font-size: clamp(2rem, 5vw, 5rem);
  line-height: 1.15;
  font-weight: 900;
  text-align: center;
}

.final-panel {
  min-height: 86vh;
}

@media (max-width: 920px) {
  .site-header {
    align-items: flex-start;
  }

  nav {
    display: none;
  }

  .progress-rail {
    display: none;
  }

  main {
    width: min(100% - 28px, 680px);
    padding-top: 82px;
  }

  .hero,
  .split,
  .blueprint {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    min-height: 320px;
  }

  .hero-visual img {
    height: 420px;
    min-height: 320px;
  }

  .method-grid,
  .case-grid,
  .timeline,
  .workflow-board,
  .prompt-card,
  .checklist,
  .output-list,
  .audience-grid,
  .compare-box {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: clamp(4.2rem, 20vw, 6.4rem);
  }

  h2 {
    font-size: clamp(2rem, 11vw, 3.8rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}