:root {
  --ink: #17233f;
  --muted: #64708a;
  --line: #dfe5ef;
  --blue: #1748d3;
  --blue-soft: #eef3ff;
  --paper: #ffffff;
  --wash: #f6f8fc;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Noto Sans TC", Inter, "PingFang TC", "Microsoft JhengHei", sans-serif;
  line-height: 1.7;
}

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

.back-link {
  color: var(--muted);
}

.back-link span,
footer a span {
  color: var(--blue);
}

.hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 72px 32px 48px;
}

.eyebrow {
  margin: 0 0 22px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.14em;
}

/* 區塊標籤：字級由 17px 降至 13px，字距略為收斂但保留層級感 */
.section-label {
  margin: 0 0 22px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 750;
  letter-spacing: 0.12em;
}

/* Hero 主標：桌機最大字級由 66px 降至 52px，降低過度強烈的視覺感 */
h1 {
  max-width: 800px;
  margin: 0;
  font-size: clamp(38px, 4.2vw, 52px);
  line-height: 1.12;
  letter-spacing: -0.045em;
}

.hero-copy {
  max-width: 660px;
  margin: 26px 0 38px;
  color: var(--muted);
  font-size: clamp(17px, 1.6vw, 20px);
}

.project-meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  margin: 0;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.project-meta div {
  display: grid;
  gap: 4px;
}

.project-meta dt {
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.project-meta dd {
  margin: 0;
  font-size: 14px;
}

.section {
  max-width: 1120px;
  margin: 0 auto;
  padding: 88px 32px;
}

.two-column {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  column-gap: 72px;
  row-gap: 0;
}

.two-column > .section-label {
  grid-column: 1 / -1;
  margin-bottom: 40px;
}

/* 一般區塊標題：最大字級由 42px 降至 36px */
h2 {
  margin: 0;
  font-size: clamp(26px, 2.6vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.035em;
}

.body-copy p,
.decision-copy > p:not(.section-label),
.section-intro > p:not(.section-label),
.outcome-field p,
.reflection-field p {
  color: var(--muted);
  font-size: 17px;
}

.body-copy p:first-child {
  margin-top: 0;
}

.constraint {
  margin-top: 36px;
  padding: 22px 24px;
  color: var(--muted);
  background: var(--wash);
  border-left: 3px solid var(--blue);
  font-size: 14px;
}

.constraint strong,
.tradeoff strong {
  display: block;
  margin-bottom: 4px;
  color: var(--ink);
}

.principle {
  margin-top: 34px;
  padding: 28px 30px;
  color: white;
  background: var(--ink);
  border-radius: 14px;
}

.principle > span {
  display: block;
  margin-bottom: 12px;
  color: #91abf8;
  font-size: 11px;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.principle blockquote {
  margin: 0;
  font-size: clamp(22px, 2.5vw, 30px);
  font-weight: 750;
  line-height: 1.4;
  letter-spacing: -0.025em;
}

.principle p {
  margin: 10px 0 0;
  color: #bdc7dc;
  font-size: 14px;
}

.decision-section {
  border-top: 1px solid var(--line);
}

.decision-section > .section-label {
  margin-bottom: 48px;
}

.decision {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  align-items: start;
  gap: 54px;
}

.decision + .decision {
  margin-top: 72px;
  padding-top: 56px;
  border-top: 1px solid var(--line);
}

.decision.reverse {
  grid-template-columns: 1.25fr 0.75fr;
}

.decision.reverse .decision-copy {
  order: 2;
}

.decision-number {
  display: block;
  margin-bottom: 18px;
  color: #a8b1c4;
  font-size: 13px;
  font-weight: 750;
}

.tradeoff {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.image-placeholder {
  min-height: 350px;
  padding: 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--blue);
  background:
    linear-gradient(135deg, rgba(23, 72, 211, 0.05), rgba(23, 72, 211, 0.015)),
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 16px,
      rgba(23, 72, 211, 0.025) 16px,
      rgba(23, 72, 211, 0.025) 32px
    );
  border: 1.5px dashed #9bb2ee;
  border-radius: 18px;
  text-align: center;
}

.image-placeholder small {
  max-width: 440px;
  color: var(--muted);
  font-size: 12px;
}

.image-placeholder img {
  max-width: 100%;
  max-height: 480px;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 10px;
}

.image-frame {
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-frame img {
  max-width: 100%;
  max-height: 480px;
  width: auto;
  height: auto;
  object-fit: contain;
  border: 1px solid #e2e2e2;
  border-radius: 10px;
}

.template-media {
  margin: 0;
}

.template-media img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid #e2e2e2;
  border-radius: 10px;
}

.template-media figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

.workflow {
  border-top: 1px solid var(--line);
}

.section-intro {
  margin-bottom: 38px;
}

.section-intro > p {
  max-width: 1000px;
  text-wrap: pretty;
}

.flow-placeholder {
  min-height: 170px;
}

.workflow-steps {
  margin: 38px 0 34px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  list-style: none;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.workflow-steps li {
  position: relative;
  min-height: 140px;
  padding: 28px 42px 28px 24px;
}

.workflow-steps li:first-child {
  padding-left: 0;
}

.workflow-steps li + li {
  border-left: 1px solid var(--line);
}

.workflow-steps li:not(:last-child)::after {
  content: "→";
  position: absolute;
  top: 27px;
  right: 15px;
  color: var(--blue);
  font-size: 18px;
}

.workflow-steps span,
.workflow-steps strong {
  display: block;
}

.workflow-steps span {
  color: var(--muted);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.workflow-steps strong {
  margin-top: 20px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.55;
}

.action-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 24px;
}

.action-grid .image-placeholder {
  min-height: 260px;
}

.media-count-1 {
  grid-template-columns: 1fr;
}

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

.outcome-reflection {
  border-top: 1px solid var(--line);
}

.outcome-title {
  margin: 0 0 28px;
}

.outcome-reflection-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 64px;
}

.outcome-field {
  flex: 1.4 1 320px;
  min-width: 0;
}

.outcome-field p:first-child {
  margin-top: 0;
}

.outcome-field h3 {
  margin: 34px 0 12px;
  font-size: 16px;
}

.outcome-field ul {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.outcome-field li {
  margin: 8px 0;
}

.reflection-field {
  flex: 1 1 260px;
  min-width: 0;
  padding-left: 32px;
  border-left: 2px solid var(--line);
}

.reflection-field h3 {
  margin: 0 0 12px;
  color: rgb(168, 177, 196);
  font-size: 13px;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.reflection-field ul {
  margin: 0;
  padding-left: 0;
  list-style: none;
  color: var(--muted);
}

.reflection-field li {
  margin: 8px 0;
}

.outcome-field .reflection-field {
  margin-top: 34px;
  padding-left: 0;
  border-left: 0;
}

.metrics-field {
  flex: 1 1 260px;
  min-width: 0;
  padding-left: 32px;
  border-left: 2px solid var(--line);
}

.metrics-field h3 {
  margin: 0 0 12px;
  color: rgb(168, 177, 196);
  font-size: 13px;
  font-weight: 750;
  letter-spacing: 0.12em;
}

.metrics-field ul {
  margin: 0;
  padding-left: 20px;
  list-style: disc;
  color: var(--muted);
}

.metrics-field li {
  margin: 8px 0;
}

.cover-section {
  padding-top: 28px;
}

.cover-section .image-placeholder {
  min-height: 480px;
}

.compact-section {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  column-gap: 72px;
  row-gap: 0;
  border-top: 1px solid var(--line);
}

.compact-section > .section-label {
  grid-column: 1 / -1;
  margin-bottom: 40px;
}

.compact-content > p:first-child {
  margin-top: 0;
}

.compact-content > p,
.compact-content > ul {
  color: var(--muted);
  font-size: 17px;
}

/* 單一區塊的堆疊版型：標題／內文整寬顯示於上方，圖片置中於下方（如 Reader LOGIN FLOW） */
.compact-section.stacked {
  grid-template-columns: 1fr;
  row-gap: 18px;
}

.compact-section.stacked .compact-heading {
  margin-bottom: 4px;
}

.short-media-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.short-media-grid.media-count-1 {
  grid-template-columns: 1fr;
}

.short-media-grid.media-count-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.short-media-grid .image-placeholder {
  min-height: 240px;
  padding: 20px;
}

.article-page .hero {
  max-width: 820px;
}

.article-page .hero h1 {
  max-width: 780px;
}

.article-body {
  max-width: 760px;
  margin: 0 auto;
  padding: 70px 32px 110px;
  border-top: 1px solid var(--line);
}

.article-body > p,
.article-body > ul {
  color: #3d4963;
  font-size: 18px;
}

.article-body > p {
  margin: 0 0 28px;
}

/* 文章內文小標題：同步縮小，避免文章頁標題過大 */
.article-body > h2 {
  margin: 72px 0 24px;
  font-size: clamp(24px, 2.4vw, 32px);
}

.article-body > blockquote {
  margin: 56px 0;
  padding: 12px 0 12px 30px;
  color: var(--ink);
  border-left: 3px solid var(--blue);
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 700;
  line-height: 1.5;
}

.article-body cite {
  display: block;
  margin-top: 12px;
  color: var(--muted);
  font-size: 12px;
  font-style: normal;
  font-weight: 400;
}

.article-body .template-media,
.article-body > .image-placeholder {
  margin: 54px 0;
}

.template-error {
  max-width: 680px;
  margin: 80px auto;
  padding: 24px;
  color: #8b1e2d;
  background: #fff1f3;
  border-radius: 12px;
}

footer {
  padding: 86px 5vw 44px;
  color: white;
  background: var(--ink);
}

footer p {
  margin: 0 0 12px;
  color: #96a2bb;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

footer a {
  display: inline-block;
  font-size: clamp(26px, 4vw, 50px);
  font-weight: 750;
  letter-spacing: -0.035em;
}

footer small {
  display: block;
  min-height: 1.7em;
  margin-top: 72px;
  color: #96a2bb;
}

@media (max-width: 760px) {
  .hero {
    padding: 56px 20px 38px;
  }

  /* 手機版 Hero 主標：由 38px 降至 34px */
  h1 {
    font-size: 34px;
  }

  .hero-copy {
    margin: 26px 0 38px;
  }

  .project-meta {
    grid-template-columns: 1fr 1fr;
  }

  .section {
    padding: 66px 20px;
  }

  .two-column,
  .compact-section,
  .decision,
  .decision.reverse {
    grid-template-columns: 1fr;
    gap: 42px;
  }

  .outcome-reflection-grid {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 42px;
  }

  .outcome-field,
  .metrics-field {
    flex: none;
    width: 100%;
  }

  .reflection-field,
  .metrics-field {
    padding-left: 0;
    padding-top: 32px;
    border-left: none;
    border-top: 1px solid var(--line);
  }

  .outcome-field .reflection-field {
    padding-top: 0;
    border-top: 0;
  }

  .decision.reverse .decision-copy {
    order: initial;
  }

  .image-placeholder {
    min-height: 300px;
  }

  .principle {
    padding: 24px;
  }

  .action-grid {
    grid-template-columns: 1fr;
  }

  .workflow-steps {
    grid-template-columns: 1fr;
  }

  .workflow-steps li,
  .workflow-steps li:first-child {
    min-height: 0;
    padding: 22px 36px 22px 0;
  }

  .workflow-steps li + li {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .workflow-steps li:not(:last-child)::after {
    top: auto;
    left: 50%;
    right: auto;
    bottom: -12px;
    transform: translateX(-50%);
    background: var(--paper);
    padding: 0 6px;
    content: "↓";
  }

  .workflow-steps strong {
    margin-top: 10px;
  }

  .cover-section .image-placeholder {
    min-height: 320px;
  }

  .short-media-grid,
  .short-media-grid.media-count-3 {
    grid-template-columns: 1fr;
  }

  .article-body {
    padding: 56px 20px 80px;
  }

  .article-body > blockquote {
    margin: 42px 0;
    padding-left: 20px;
  }

  footer {
    padding: 64px 20px 36px;
  }

  footer small {
    min-height: 3.4em;
  }
}