:root {
  --ink: #08132f;
  --muted: #657086;
  --line: #dfe5ec;
  --paper: #ffffff;
  --mist: #f4f7f8;
  --teal: #0f8b8d;
  --green: #9fb76d;
  --brass: #b98b4d;
  --brand-blue: #073bd6;
  --brand-purple: #8b22f4;
  --shadow: 0 24px 60px rgba(8, 19, 47, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", Arial, sans-serif;
  line-height: 1.65;
}

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

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  min-height: 76px;
  padding: 16px clamp(22px, 4vw, 64px);
  border-bottom: 1px solid rgba(223, 229, 236, 0.76);
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  width: 152px;
  height: 42px;
}

.brand img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.4vw, 34px);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 30px);
  color: #25304c;
  font-size: 0.92rem;
  font-weight: 600;
}

.nav-links a {
  padding: 8px 0;
}

.nav-links a:hover {
  color: var(--teal);
}

.language-switcher {
  display: inline-grid;
  grid-template-columns: 1fr 1fr;
  width: 82px;
  min-width: 82px;
  padding: 3px;
  border: 1px solid rgba(8, 19, 47, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.76);
}

.lang-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  min-height: 30px;
  padding: 0 8px;
  border: 0;
  border-radius: 6px;
  color: #46516a;
  background: transparent;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 850;
  cursor: pointer;
}

.lang-button.is-active {
  color: #fff;
  background: var(--ink);
}

.lang-button:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

.hero {
  position: relative;
  display: grid;
  align-items: center;
  min-height: 88vh;
  padding: 120px clamp(24px, 6vw, 88px) 72px;
  overflow: hidden;
}

.hero-bg,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero-bg {
  background-image: url("assets/tainus-hero.png");
  background-position: center;
  background-size: cover;
  transform: scale(1.01);
}

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 255, 255, 0.88) 38%, rgba(255, 255, 255, 0.46) 76%, rgba(255, 255, 255, 0.24) 100%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.58) 0%, rgba(244, 247, 248, 0.2) 75%, #f4f7f8 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(4.5rem, 12vw, 9.5rem);
  line-height: 0.92;
  letter-spacing: 0;
}

.hero-lede {
  max-width: 670px;
  margin: 30px 0 0;
  color: #22304c;
  font-size: clamp(1.35rem, 2.3vw, 2.05rem);
  font-weight: 650;
  line-height: 1.42;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 38px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 0.96rem;
  font-weight: 800;
}

.button-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--brand-purple), var(--brand-blue));
  box-shadow: 0 14px 32px rgba(7, 59, 214, 0.2);
}

.button-secondary {
  color: var(--ink);
  border-color: rgba(8, 19, 47, 0.18);
  background: rgba(255, 255, 255, 0.72);
}

.intro-band,
.ai-section {
  padding: clamp(64px, 9vw, 112px) clamp(24px, 6vw, 88px);
  background: var(--mist);
}

.section-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(34px, 7vw, 96px);
  max-width: 1180px;
  margin: 0 auto;
}

h2 {
  margin: 0;
  font-size: clamp(2rem, 4.1vw, 4.2rem);
  font-weight: 850;
  line-height: 1.12;
  letter-spacing: 0;
}

.section-copy p,
.direction-panel p,
.promise-content p {
  margin: 0;
  color: #34405a;
  font-size: clamp(1rem, 1.35vw, 1.18rem);
}

.section-copy p + p {
  margin-top: 18px;
}

.mission-section,
.principles-section,
.audience-section,
.promise-section {
  padding: clamp(68px, 9vw, 124px) clamp(24px, 6vw, 88px);
}

.section-heading {
  max-width: 950px;
  margin: 0 auto clamp(34px, 5vw, 58px);
}

.mission-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  max-width: 1180px;
  margin: 0 auto;
  background: var(--line);
  border: 1px solid var(--line);
}

.mission-list article {
  min-height: 230px;
  padding: 26px;
  background: #fff;
}

.mission-list span {
  display: block;
  margin-bottom: 52px;
  color: var(--brass);
  font-size: 0.88rem;
  font-weight: 850;
}

.mission-list p {
  margin: 0;
  font-size: 1.07rem;
  font-weight: 700;
  line-height: 1.55;
}

.principles-section {
  background: #f8faf9;
}

.principles-grid,
.audience-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  max-width: 1180px;
  margin: 0 auto;
}

.principle-card,
.audience-grid article {
  min-height: 242px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 16px 42px rgba(8, 19, 47, 0.06);
}

.principle-card h3,
.audience-grid h3 {
  margin: 0 0 16px;
  font-size: 1.24rem;
  line-height: 1.25;
}

.principle-card h3::before {
  content: "";
  display: block;
  width: 42px;
  height: 4px;
  margin-bottom: 22px;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--teal), var(--green));
}

.principle-card p,
.audience-grid p {
  margin: 0;
  color: #46516a;
  font-size: 0.98rem;
}

.direction-section {
  padding: clamp(66px, 9vw, 118px) clamp(24px, 6vw, 88px);
  color: #fff;
  background: #101727;
}

.direction-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.72fr);
  gap: clamp(34px, 7vw, 84px);
  align-items: center;
  max-width: 1180px;
  margin: 0 auto;
}

.direction-panel h2,
.direction-panel .section-kicker {
  color: #fff;
}

.direction-panel p {
  max-width: 720px;
  margin-top: 24px;
  color: #c8d1df;
}

.report-flow {
  display: grid;
  gap: 14px;
}

.report-flow div {
  position: relative;
  padding: 22px 24px 22px 28px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
}

.report-flow div::before {
  content: "";
  position: absolute;
  top: 22px;
  bottom: 22px;
  left: 0;
  width: 4px;
  background: var(--brass);
}

.report-flow span {
  display: block;
  color: #91d2cd;
  font-size: 0.76rem;
  font-weight: 850;
  text-transform: uppercase;
}

.report-flow strong {
  display: block;
  margin-top: 4px;
  font-size: 1.35rem;
}

.ai-section {
  background:
    linear-gradient(90deg, rgba(15, 139, 141, 0.1), rgba(159, 183, 109, 0.08)),
    #f6f8f6;
}

.audience-grid article {
  min-height: 188px;
}

.audience-grid h3 {
  color: var(--teal);
}

.promise-section {
  background: #f1f4f6;
}

.promise-content {
  max-width: 880px;
  margin: 0 auto;
  text-align: center;
}

.promise-content p {
  max-width: 640px;
  margin: 24px auto 30px;
}

.site-footer {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  padding: 28px clamp(24px, 6vw, 88px);
  border-top: 1px solid var(--line);
  color: #657086;
  font-size: 0.86rem;
}

.site-footer img {
  width: 34px;
  height: 34px;
  object-fit: cover;
  border-radius: 7px;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 980px) {
  .section-grid,
  .direction-panel {
    grid-template-columns: 1fr;
  }

  .mission-list,
  .principles-grid,
  .audience-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero {
    min-height: 84vh;
  }
}

@media (max-width: 720px) {
  .site-header {
    min-height: 68px;
    padding: 12px 18px;
  }

  .brand {
    width: 128px;
    height: 36px;
  }

  .nav-links {
    display: none;
  }

  .header-actions {
    gap: 0;
  }

  .hero {
    min-height: 82vh;
    padding: 104px 22px 54px;
  }

  .hero-bg {
    background-position: 58% center;
  }

  .hero-overlay {
    background:
      linear-gradient(90deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 255, 255, 0.83) 58%, rgba(255, 255, 255, 0.4) 100%),
      linear-gradient(180deg, rgba(255, 255, 255, 0.68) 0%, #f4f7f8 100%);
  }

  .hero h1 {
    font-size: clamp(4.1rem, 20vw, 6.5rem);
  }

  .hero-lede {
    max-width: 18rem;
    font-size: 1.28rem;
  }

  .button {
    width: 100%;
  }

  .mission-list,
  .principles-grid,
  .audience-grid {
    grid-template-columns: 1fr;
  }

  .mission-list article,
  .principle-card,
  .audience-grid article {
    min-height: auto;
  }

  .mission-list span {
    margin-bottom: 24px;
  }

  .site-footer {
    grid-template-columns: 1fr;
  }
}