/* ============================================================
   STARTUP ISLAND TAIWAN — Front-end CSS
   Ported 1:1 from the official design implementation.
   Breakpoints: default(1280+) | max-1279 | max-1023 | max-767
   ============================================================ */

:root {
  /* Brand tokens */
  --sit-background: #f1efe9;
  --sit-primary:    #f50;
  --sit-green:      #96d200;
  --sit-yellow:     #ffc800;
  --sit-blue:       #00afff;
  --sit-purple:     #7b61ff;
  --sit-black:      #333;
  --sit-gray:       #999;
  --sit-lightgray:  #d7d3c8;
  --sit-white:      #fff;

  /* Legacy aliases (about-us page) */
  --orange:  #f50;
  --dark:    #1a1a1a;
  --teal:    #00afff;
  --green:   #6eb33f;
  --lime:    #96d200;
  --yellow:  #ffc800;
  --cream:   #f1efe9;
  --white:   #ffffff;
  --text:    #333333;
  --muted:   #666666;
  --max-w:   1440px;
  --pad:     24px;
  --nav-h:   80px;
  --ease:    0.25s ease;
}

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Montserrat', 'Noto Sans TC', 'PingFang TC', 'Microsoft JhengHei', sans-serif;
  color: var(--sit-black);
  background: var(--sit-background);
  padding-top: 80px; /* fixed header */
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a   { color: inherit; text-decoration: none; }
ul  { list-style: none; }
button { font-family: inherit; cursor: pointer; }

/* ── Generic containers (about-us page) ──────────────────── */
.wrap   { max-width: var(--max-w); margin: 0 auto; padding: 0 var(--pad); }
.sec    { padding: 80px 0; }
.sec-lg { padding: 100px 0; }
.tag-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .18em;
  text-transform: uppercase;
  padding-bottom: 6px;
  border-bottom: 2px solid currentColor;
  margin-bottom: 20px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
  border: 2px solid transparent;
  transition: all var(--ease);
  white-space: nowrap;
}
.btn-teal       { background: var(--teal); color: #fff; }
.btn-teal:hover { background: #0090cc; }

/* ─────────────────────────────────────────────────────────── */
/* HEADER                                                      */
/* ─────────────────────────────────────────────────────────── */
.sit-header {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: 80px;
  z-index: 1100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 60px;
  background: var(--sit-background);
  box-shadow: 0 1px 2px rgba(0,0,0,.25);
  font-size: 13px;
  line-height: 20px;
  font-weight: 700;
}
.sit-logo {
  width: 133px;
  height: 80px;
  flex: 0 0 auto;
  background: url('/icons/big-logo.svg') 50% 50% no-repeat;
  cursor: pointer;
}
.sit-menu {
  display: flex;
  gap: 48px;
  height: 80px;
  align-items: center;
  color: var(--sit-black);
}
.sit-menu > a {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  cursor: pointer;
}
.sit-menu > a:hover { color: var(--sit-primary); }

/* Language dropdown */
.sit-lang { position: relative; flex: 0 0 auto; cursor: pointer; }
.sit-lang-select {
  width: 131px;
  height: 40px;
  padding: 0 6px;
  font-size: 16px;
  line-height: 38px;
  font-weight: 400;
  text-align: left;
  color: var(--sit-black);
  background: var(--sit-background);
  border: 0;
  border-bottom: 2px solid var(--sit-gray);
  position: relative;
  display: block;
}
.sit-lang:hover .sit-lang-select { border-color: var(--sit-primary); }
.sit-lang-content { display: flex; align-items: center; gap: 6px; }
.sit-lang-content svg { flex: 0 0 auto; }
.sit-lang-caret {
  width: 40px;
  height: 40px;
  position: absolute;
  right: -6px;
  top: 52%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
}
.sit-lang-list {
  display: none;
  text-align: center;
  width: 178px;
  top: 71px;
  left: -20px;
  margin: 0;
  padding: 8px 0;
  list-style: none;
  z-index: 100;
  position: absolute;
  box-shadow: 0 2px 2px rgba(0,0,0,.25);
  background-color: var(--sit-background);
}
.sit-lang.is-open .sit-lang-list { display: block; }
.sit-lang-list li {
  font-size: 16px;
  line-height: 28px;
  font-weight: 400;
  width: 100%;
  padding: 11px;
  color: var(--sit-gray);
  cursor: pointer;
}
.sit-lang-list li:hover { background: var(--sit-primary); color: var(--sit-white); }
.sit-lang-list li.is-cur { color: var(--sit-primary); }
.sit-lang-list li.is-cur:hover { color: var(--sit-white); }

/* Mobile locale row */
.sit-locale-mobile { display: none; }

/* Hamburger */
.sit-hamburger {
  display: none;
  width: 40px;
  height: 40px;
  background: url('/icons/hamburger.svg') 50% 50% no-repeat;
  border: 0;
  cursor: pointer;
}

@media (max-width: 1279px) {
  .sit-header { padding: 0 40px; }
  .sit-hamburger { display: block; }
  .sit-lang { display: none; }
  .sit-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    height: calc(var(--vh, 1vh) * 100);
    padding-top: 40px;
    background: var(--sit-background);
    border-top: 2px solid var(--sit-primary);
    overflow-y: auto;
  }
  .sit-menu.is-open { display: block; }
  .sit-menu > a {
    font-size: 18px;
    line-height: 60px;
    letter-spacing: 1px;
    font-weight: 700;
    display: block;
    width: 100%;
    height: auto;
    padding-left: 40px;
  }
  .sit-menu > a:hover { background-color: var(--sit-primary); color: var(--sit-white); }
  .sit-locale-mobile {
    font-size: 13px;
    line-height: 20px;
    font-weight: 700;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100px;
    margin-top: 12px;
    gap: 56px;
  }
  .sit-locale-mobile a.is-cur { color: var(--sit-primary) !important; }
}

/* Flash */
.flash { padding: 14px 24px; font-size: 14px; text-align: center; }
.flash-success { background: #d4edda; color: #155724; }
.flash-error   { background: #f8d7da; color: #721c24; }

/* ─────────────────────────────────────────────────────────── */
/* HERO                                                        */
/* ─────────────────────────────────────────────────────────── */
.sit-hero {
  position: relative;
  width: 100%;
  margin-bottom: 100px;
  overflow: hidden;
}
.sit-hero-video {
  width: 100%;
  min-height: 640px;
  height: calc(100vh - 80px);
  object-fit: cover;
  border: 0;
  z-index: 0;
  display: block;
}
.sit-hero-mask {
  width: 100%;
  min-height: 640px;
  height: calc(100vh - 80px);
  background-color: rgba(0,0,0,.6);
  position: absolute;
  top: 0;
  left: 0;
  z-index: 10;
}
.sit-hero-banner {
  height: 100%;
  padding: 95px 40px 80px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.sit-hero-banner h1 {
  font-size: 92px;
  line-height: 110px;
  letter-spacing: 2px;
  font-weight: 700;
  color: var(--sit-white);
  margin: 0;
}
.sit-hero-banner h3 {
  font-size: 28px;
  line-height: 40px;
  letter-spacing: 1px;
  font-weight: 700;
  color: var(--sit-white);
  margin-top: 20px;
}
.sit-social { display: flex; align-items: center; gap: 6px; }
.sit-social a {
  width: 40px;
  height: 40px;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: 50%;
}
.sit-so-1 { background-image: url('/icons/home/facebook.svg'); }
.sit-so-2 { background-image: url('/icons/home/instagram.svg'); }
.sit-so-3 { background-image: url('/icons/home/youtube.svg'); }
.sit-so-4 { background-image: url('/icons/home/twitter.svg'); }
.sit-so-5 { background-image: url('/icons/home/linkedin.svg'); }
.sit-so-6 { background-image: url('/icons/home/spotify.svg'); }

@media (max-width: 1023px) {
  .sit-hero-video, .sit-hero-mask { min-height: 560px; }
  .sit-hero-banner h1 { font-size: 58px; line-height: 72px; }
  .sit-social { width: 295px; flex-wrap: wrap; }
}
@media (max-width: 767px) {
  .sit-hero-banner h3 { font-size: 22px; line-height: 36px; letter-spacing: 0; }
}

/* ─────────────────────────────────────────────────────────── */
/* HOMEPAGE MAIN                                               */
/* ─────────────────────────────────────────────────────────── */
.sit-main {
  padding-top: 76px;
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
}
.sit-section {
  display: flex;
  justify-content: space-between;
}
.sit-section p {
  font-size: 22px;
  line-height: 36px;
  letter-spacing: 0;
  font-weight: 400;
  margin: 32px 0 40px;
  white-space: pre-line;
}

/* Section titles */
.sit-title h2 {
  font-size: 56px;
  line-height: 80px;
  letter-spacing: 1px;
  font-weight: 700;
  margin: 0 0 24px;
  max-width: 570px;
  word-break: break-word;
}
.sit-title hr {
  width: 80px;
  border: 2px solid currentColor;
  margin: 0;
}

/* Section subtitles (h3) */
.sit-sec-1 h3, .sit-sec-3 h3, .sit-sec-4 h3, .sit-caption-2 h3 {
  font-size: 28px;
  line-height: 40px;
  letter-spacing: 1px;
  font-weight: 700;
  margin: 32px 0 16px;
  white-space: pre-line;
}

/* Buttons */
.sit-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 260px;
  height: 60px;
  padding: 0 24px;
  font-size: 18px;
  letter-spacing: 1px;
  font-weight: 700;
  color: var(--sit-white);
  white-space: nowrap;
  cursor: pointer;
}
.sit-btn-icon {
  width: 40px;
  height: 40px;
  display: block;
  background: url('/icons/home/btn-arrow.svg') 50% 50% / contain no-repeat;
}

/* Cover images + color blocks */
.sit-cover-1 img, .sit-cover-2 img, .sit-cover-3 img, .sit-cover-4 img { max-width: none; }
.sit-caption-1, .sit-caption-3, .sit-caption-4 { flex-shrink: 0; }
.sit-cover-1 { position: relative; display: inline-block; }
.sit-cover-1::before {
  content: "";
  width: 400px; height: 400px;
  position: absolute;
  left: -80px; top: -80px;
  background-color: var(--sit-green);
  z-index: -10;
}
.sit-cover-1 img { width: 480px; height: 480px; object-fit: cover; }

.sit-cover-2 { position: relative; display: inline-block; }
.sit-cover-2::before {
  content: "";
  width: 400px; height: 400px;
  position: absolute;
  right: -80px; top: -80px;
  background-color: var(--sit-primary);
  z-index: -10;
}
.sit-cover-2 img { width: 720px; height: 480px; object-fit: cover; }

.sit-cover-3 { position: relative; }
.sit-cover-3::before {
  content: "";
  width: 400px; height: 400px;
  position: absolute;
  left: -80px; bottom: -80px;
  background-color: var(--sit-yellow);
  z-index: -10;
}
.sit-cover-3 img { width: 480px; height: 620px; object-fit: cover; }

.sit-cover-4 { position: relative; display: inline-block; }
.sit-cover-4::before {
  content: "";
  width: 400px; height: 400px;
  position: absolute;
  right: -80px; bottom: -80px;
  background-color: var(--sit-blue);
  z-index: -10;
}
.sit-cover-4 img { width: 480px; height: 480px; object-fit: cover; }

/* Section 1 — OUR MISSION */
.sit-caption-1 { position: relative; }
.sit-icon-1 {
  display: none;
  width: 169px;
  position: absolute;
  top: 246px; left: 196px;
  z-index: -10;
}
.sit-sec-1 {
  padding-top: 120px;
  margin: 0 0 160px 80px;
  background-image: url('/icons/home/home-section1.svg');
  background-repeat: no-repeat;
  background-position: 100% 0;
  background-size: 282px 204px;
}

/* Section 2 — WHY TAIWAN */
.sit-caption-2 {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.sit-why-header {
  margin-top: -90px !important;
  padding-right: 50px;
}
.sit-icon-2 { display: block; }
.sit-icon-2 img { width: 309px; height: auto; }
.sit-sec-2 { padding-top: 80px; position: relative; }
.sit-sec-2 .sit-btn-float {
  position: absolute;
  right: 0;
  margin: -30px 0 0;
}
.sit-sec-2 p { margin: 54px 0 0; max-width: 720px; }

/* Break heading + ecosystem icon */
.sit-break {
  font-size: 56px;
  line-height: 80px;
  letter-spacing: 1px;
  font-weight: 700;
  margin: 160px 0 80px;
}
.sit-eco { display: flex; justify-content: flex-end; }
.sit-icon-3 { display: block; }
.sit-icon-3 img { width: 193px; height: 252px; }

/* Section 3 — MEET THE COMMUNITY */
.sit-caption-3 { margin-top: -120px; }
.sit-sec-3 { margin: 0 auto 320px 80px; }
.sit-sec-3 p { margin-top: 0; }

/* Section 4 — HOW WE CAN HELP */
.sit-next-mobile {
  display: none;
  justify-content: flex-start;
  margin-bottom: 8px;
}
.sit-next-inline {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 88px;
}
.sit-icon-4 { display: block; }
.sit-icon-4 img { width: 303px; height: 192px; }
.sit-sec-4 { margin-right: 80px; }
.sit-sec-4 p { margin-top: 0; }
.sit-caption-4 { margin-top: 120px; }

/* ── Homepage responsive ─────────────────────────────────── */
@media (max-width: 1279px) {
  .sit-main { max-width: 100%; padding: 76px 80px 0; }
  .sit-title h2 { font-size: 46px; line-height: 60px; letter-spacing: 0; }
  .sit-break { font-size: 46px; line-height: 60px; letter-spacing: 0; }
  .sit-cover-1::before, .sit-cover-2::before, .sit-cover-3::before, .sit-cover-4::before { width: 280px; height: 280px; }
  .sit-cover-1 img, .sit-cover-4 img { width: 336px; height: 336px; }
  .sit-cover-2 img { width: 504px; height: 336px; }
  .sit-cover-3 img { width: 336px; height: 434px; }
  .sit-sec-1 { padding-top: 143px; background-size: 197px 143px; }
  .sit-icon-2 img { width: 216px; }
  .sit-icon-3 img { width: 135px; height: auto; }
  .sit-icon-4 img { width: 213px; height: auto; }
  .sit-sec-2 p { max-width: 504px; }
}

@media (max-width: 1023px) {
  .sit-main { padding: 36px 40px 0; }
  .sit-cover-1::before { left: -40px; top: -40px; }
  .sit-cover-2::before { right: -40px; top: -40px; }
  .sit-cover-3::before { left: -40px; bottom: -40px; }
  .sit-cover-4::before { right: -40px; bottom: -40px; }
  .sit-sec-1 { background-size: 169px 122px; }
  .sit-caption-2 { width: 214px; gap: 40px; margin-bottom: 80px; }
  .sit-why-header { margin-top: unset !important; padding-right: unset; }
  .sit-icon-2 img { width: 185px; }
  .sit-icon-3 img { width: 116px; height: 151px; }
  .sit-icon-4 img { width: 182px; height: 115px; }
  .sit-sec-2 { padding-top: 40px; }
  .sit-caption-3 { margin: 8px 0 120px; }
  .sit-sec-3 { margin-left: 40px; margin-bottom: 160px; }
  .sit-sec-4 { margin-right: 40px; }
}

@media (max-width: 767px) {
  .sit-section { flex-direction: column; }
  .sit-section-last { flex-direction: column-reverse; align-items: flex-end; }
  .sit-title h2 { font-size: 32px; line-height: 48px; margin-bottom: 20px; }
  .sit-break { font-size: 32px; line-height: 48px; }
  .sit-sec-1 h3, .sit-sec-3 h3, .sit-sec-4 h3, .sit-caption-2 h3 {
    font-size: 22px; line-height: 36px; letter-spacing: 0; margin-top: 24px;
  }
  .sit-cover-1::before, .sit-cover-2::before, .sit-cover-3::before, .sit-cover-4::before { width: 240px; height: 240px; }
  .sit-cover-1 img, .sit-cover-4 img { width: 295px; height: 295px; }
  .sit-cover-2 { display: block; }
  .sit-cover-2 img { width: calc(100% + 40px); height: 100%; margin-left: -40px; }
  .sit-cover-3 img { width: 295px; height: 381px; }
  .sit-icon-1 { display: block; }
  .sit-sec-1 { padding-top: 80px; background-size: 0; margin-left: 0; }
  .sit-why-header { width: 300px; }
  .sit-sec-2 p { max-width: 100%; }
  .sit-sec-3 { margin-left: 0; }
  .sit-sec-4 { margin-right: 0; }
  .sit-next-mobile { display: flex; }
  .sit-next-inline { display: none; }
  .sit-caption-4 { margin: 0 0 120px; }
}

/* ─────────────────────────────────────────────────────────── */
/* GO TOP                                                      */
/* ─────────────────────────────────────────────────────────── */
.sit-gotop {
  width: 56px;
  height: 80px;
  background: url('/icons/gotop-outlined.svg') top / 56px no-repeat;
  position: relative;
  cursor: pointer;
  margin-left: auto;
  margin-right: 80px;
}
.sit-gotop::after {
  content: "Top";
  font-size: 13px;
  line-height: 20px;
  font-weight: 700;
  position: absolute;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%);
}
.sit-gotop:hover {
  background-image: url('/icons/gotop-filled.svg');
  color: var(--sit-primary);
}
@media (max-width: 1023px) {
  .sit-gotop { margin-right: 40px; }
}

/* ─────────────────────────────────────────────────────────── */
/* FOOTER                                                      */
/* ─────────────────────────────────────────────────────────── */
.sit-footer {
  width: 100%;
  padding: 40px 80px;
  background-color: var(--sit-background);
}
.sit-footer-upper {
  display: flex;
  justify-content: space-between;
  margin-bottom: 40px;
}
.sit-footer-email { width: 489px; }
.sit-footer-email h4 {
  font-size: 18px;
  line-height: 28px;
  letter-spacing: 0;
  font-weight: 700;
  margin-bottom: 4px;
}
.sit-filter { width: 100%; position: relative; display: inline-block; }
.sit-filter-input {
  width: 100%;
  height: 60px;
  font-size: 16px;
  letter-spacing: 0;
  font-weight: 400;
  color: var(--sit-black);
  background: var(--sit-background);
  padding: 0 56px 0 12px;
  border: 0;
  border-bottom: 2px solid var(--sit-gray);
  outline: none;
}
.sit-filter-input::placeholder { color: var(--sit-gray); }
.sit-filter:hover .sit-filter-input,
.sit-filter-input:focus { border-color: var(--sit-primary); }
.sit-filter-submit {
  width: 40px;
  height: 40px;
  position: absolute;
  top: 50%;
  right: 12px;
  transform: translateY(-50%);
  border: 0;
  background: transparent url('/icons/arrow-circle-gray.svg') 50% 50% / contain no-repeat;
  cursor: pointer;
}

.sit-footer-info-list { display: flex; gap: 55px; }
.sit-footer-info h5 {
  font-size: 16px;
  line-height: 24px;
  letter-spacing: 0;
  font-weight: 700;
  margin-bottom: 12px;
}
.sit-footer-info a {
  display: block;
  font-size: 16px;
  line-height: 28px;
  letter-spacing: 0;
  font-weight: 400;
  white-space: nowrap;
}
.sit-footer-info a:hover { color: var(--sit-primary); }

.sit-footer-lower {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.sit-footer-brand img { display: block; }
.sit-footer-bridging {
  font-family: 'Montserrat', sans-serif;
  font-size: 16px;
  font-style: normal;
  font-weight: 700;
  line-height: 24px;
  margin-top: 8px;
}
.sit-footer-social { display: flex; align-items: center; gap: 6px; }
.sit-footer-social > a {
  display: block;
  width: 32px;
  height: 32px;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: 50%;
}
.sit-fso-1 { background-image: url('/icons/footer/facebook.svg'); }
.sit-fso-1:hover { background-image: url('/icons/footer/facebook-sm.svg'); }
.sit-fso-2 { background-image: url('/icons/footer/instagram.svg'); }
.sit-fso-2:hover { background-image: url('/icons/footer/instagram-sm.svg'); }
.sit-fso-3 { background-image: url('/icons/footer/youtube.svg'); }
.sit-fso-3:hover { background-image: url('/icons/footer/youtube-sm.svg'); }
.sit-fso-4 { background-image: url('/icons/footer/twitter.svg'); }
.sit-fso-4:hover { background-image: url('/icons/footer/twitter-sm.svg'); }
.sit-fso-5 { background-image: url('/icons/footer/linkedin.svg'); }
.sit-fso-5:hover { background-image: url('/icons/footer/linkedin-sm.svg'); }
.sit-fso-6 { background-image: url('/icons/footer/spotify.svg'); }
.sit-fso-6:hover { background-image: url('/icons/footer/spotify-sm.svg'); }
.sit-fso-7 {
  display: block;
  width: 32px;
  height: 32px;
  background: url('/icons/footer/mail.svg') 50% 50% / contain no-repeat;
}
.sit-fso-7:hover { background-image: url('/icons/footer/mail-sm.svg'); }
.sit-footer-mailto {
  margin-left: 32px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.sit-footer-mailto h6 {
  font-size: 13px;
  line-height: 20px;
  font-weight: 500;
}
.sit-footer-policy {
  font-size: 13px;
  line-height: 24px;
  letter-spacing: 0;
  font-weight: 400;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
}
.sit-footer-policy p { margin: 0; }
.sit-footer-policy a:hover { color: var(--sit-primary); }

@media (max-width: 1279px) {
  .sit-footer-email { width: 295px; }
}
@media (max-width: 1023px) {
  .sit-footer { padding: 40px; }
  .sit-footer-upper { flex-direction: column; gap: 40px; }
  .sit-footer-email { width: 100%; }
  .sit-footer-info-list { flex-direction: column; gap: 0; }
  .sit-footer-info h5 { margin-top: 20px; white-space: nowrap; }
  .sit-footer-info:first-child h5 { margin-top: 0; }
  .sit-footer-lower { align-items: flex-start; flex-direction: column; gap: 40px; }
  .sit-footer-social > a, .sit-fso-7 { width: 40px; height: 40px; }
  .sit-footer-social { flex-wrap: wrap; }
  .sit-footer-mailto { margin: 0; }
  .sit-footer-policy { flex-wrap: wrap; gap: 10px; }
}
@media (max-width: 767px) {
  .sit-footer-email { width: 295px; }
}

/* ─────────────────────────────────────────────────────────── */
/* ABOUT US PAGE                                               */
/* ─────────────────────────────────────────────────────────── */

/* 1. Hero: vertical title + video */
.sit-about-hero { padding: 0; }
.sit-about-hero-inner {
  width: 100%;
  max-width: 1120px;
  display: flex;
  justify-content: space-between;
  margin: 80px auto 160px;
}
.sit-about-hero h1 {
  font-size: 92px;
  line-height: 110px;
  letter-spacing: 2px;
  font-weight: 700;
  writing-mode: vertical-rl;
  transform: translateX(-24px);
  margin: 0;
}
.sit-about-video-wrap {
  margin-top: 80px;
  position: relative;
}
.sit-about-video-wrap::after {
  content: "";
  background-color: var(--sit-black);
  width: 860px;
  height: 360px;
  position: absolute;
  bottom: -80px;
  right: -80px;
  z-index: -10;
}
.sit-about-video { width: 880px; height: 495px; }
.sit-about-video iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}
.sit-about-player {
  position: absolute;
  bottom: 0;
  right: 0;
}
.sit-about-play-label { text-decoration: underline; }

@media (max-width: 1279px) {
  .sit-about-hero { padding: 0 80px; }
  .sit-about-video-wrap { margin-top: 130px; }
  .sit-about-video-wrap::after { width: 606px; height: 252px; }
  .sit-about-video { width: 616px; height: 346px; }
}
@media (max-width: 1023px) {
  .sit-about-hero { padding: 0; }
  .sit-about-hero-inner { flex-direction: column; margin: 0 0 120px; }
  .sit-about-hero h1 {
    font-size: 58px;
    line-height: 72px;
    transform: none;
    writing-mode: unset;
    margin-top: 40px;
    padding-left: 24px;
  }
  .sit-about-hero h1 br { display: none; }
  .sit-about-video-wrap { margin-top: 40px; }
  .sit-about-video-wrap::after { width: 100%; height: 100%; bottom: -40px; right: 0; }
  .sit-about-video { width: 100%; height: auto; aspect-ratio: 16/9; }
  .sit-about-player { bottom: 4px; }
}

/* 2-4. Text sections with L-shaped accents */
.sit-ab-origin,
.sit-ab-brand,
.sit-ab-concept {
  width: 100%;
  max-width: 1280px;
  display: flex;
  flex-flow: row;
  align-items: flex-start;
  gap: 40px;
  position: relative;
  margin: 0 auto 200px;
}
.sit-ab-title { position: sticky; top: 120px; }
.sit-ab-text { flex: 1 1 0; position: relative; }
.sit-ab-text-inner {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.sit-ab-text-inner p {
  font-size: 16px;
  line-height: 28px;
  letter-spacing: 0;
  font-weight: 400;
  margin: 0;
  white-space: pre-line;
}

/* L accents: vertical bar (::before) + bottom foot (::after) */
.sit-ab-origin::before,
.sit-ab-brand::before,
.sit-ab-concept::before {
  content: "";
  position: absolute;
  bottom: -80px;
  width: 80px;
  height: 440px;
  max-height: calc(100% + 50px);
  z-index: 0;
}
.sit-ab-origin::after,
.sit-ab-brand::after,
.sit-ab-concept::after {
  content: "";
  position: absolute;
  bottom: -80px;
  width: 440px;
  height: 80px;
  z-index: 0;
}

/* ORIGIN — title left, text right, green L bottom-right */
.sit-ab-origin { padding-left: 80px; justify-content: flex-end; }
.sit-ab-origin .sit-ab-text { padding-right: 140px; }
.sit-ab-origin::before { right: 0; background-color: var(--sit-green); }
.sit-ab-origin::after  { right: 0; background-color: var(--sit-green); }

/* BRAND STORY — title left (clear of yellow L at container left), text right */
.sit-ab-brand { padding-right: 80px; }
.sit-ab-brand .sit-ab-title { padding-left: 140px; }
.sit-ab-brand::before { left: 0; background-color: var(--sit-yellow); }
.sit-ab-brand::after  { left: 0; background-color: var(--sit-yellow); }

/* NDC logo lockup */
.sit-ndc {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 48px;
}
.sit-ndc img { flex: 0 0 auto; }
.sit-ndc-text { display: flex; flex-direction: column; }
.sit-ndc-zh {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .14em;
  color: #1b3f8f;
  line-height: 1.3;
}
.sit-ndc-en {
  font-size: 8px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: #1b3f8f;
  line-height: 1.4;
}

/* CONCEPT & VISION — text left, title+icons right, orange L bottom-right */
.sit-ab-concept { padding: 0 140px 0 80px; }
.sit-ab-concept::before { right: 0; background-color: var(--sit-primary); }
.sit-ab-concept::after  { right: 0; background-color: var(--sit-primary); }
.sit-ab-title-icons {
  width: 424px;
  display: flex;
  flex-flow: column;
  align-items: flex-start;
  gap: 24px;
}
.sit-ab-icons {
  padding: 32px 0 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
}
.sit-ab-iconwrap {
  width: 200px;
  height: 148px;
  display: grid;
  grid-template-rows: 120px auto;
  align-items: center;
  justify-content: center;
  justify-items: center;
  gap: 4px;
}
.sit-ab-iconwrap > p {
  font-size: 13px;
  line-height: 24px;
  letter-spacing: 0;
  font-weight: 400;
  margin: 0;
  text-align: center;
  align-self: flex-start;
}
.sit-ab-icon1 { width: 120px; height: 98px; }
.sit-ab-icon2 { width: 120px; height: 76px; }
.sit-ab-icon3 { width: 124px; height: 90px; }
.sit-ab-icon4 { width: 69px;  height: 90px; }

@media (max-width: 1279px) {
  .sit-ab-origin { padding: 0 0 0 80px; }
  .sit-ab-brand { padding: 0 0 0 0; padding-right: 0; }
  .sit-ab-brand .sit-ab-title { padding-left: 120px; }
  .sit-ab-concept { padding: 0 100px 0 0; max-width: unset; }
  .sit-ab-origin::before, .sit-ab-brand::before, .sit-ab-concept::before { width: 56px; height: 308px; bottom: -56px; }
  .sit-ab-origin::after, .sit-ab-brand::after, .sit-ab-concept::after { width: 308px; height: 56px; bottom: -56px; }
  .sit-ab-origin .sit-ab-text { padding-right: 100px; }
  .sit-ab-title-icons { width: 344px; }
  .sit-ab-iconwrap { width: 160px; grid-template-rows: 96px auto; }
  .sit-ab-icon1 { width: 96px; height: 78px; }
  .sit-ab-icon2 { width: 96px; height: 61px; }
  .sit-ab-icon3 { width: 99px; height: 72px; }
  .sit-ab-icon4 { width: 55px; height: 72px; }
  .sit-ab-icons { justify-content: center; }
}
@media (max-width: 1023px) {
  .sit-ab-origin, .sit-ab-brand { flex-flow: column; gap: 0; padding: 0 40px; margin-bottom: 160px; }
  .sit-ab-concept { flex-flow: column-reverse; gap: 0; padding: 0 40px; margin-bottom: 160px; }
  .sit-ab-title { position: relative; top: unset; }
  .sit-ab-brand .sit-ab-title { padding-left: 0; }
  .sit-ab-text { flex: unset; width: 100%; margin-top: 24px; }
  .sit-ab-origin .sit-ab-text { padding-right: 0; }
  .sit-ab-title-icons { width: unset; }
  .sit-ab-icons { width: 344px; }
}
@media (max-width: 767px) {
  .sit-ab-origin, .sit-ab-brand, .sit-ab-concept { margin-bottom: 120px; }
  .sit-ab-origin::before, .sit-ab-brand::before, .sit-ab-concept::before { display: none; }
  .sit-ab-origin::after, .sit-ab-brand::after, .sit-ab-concept::after { width: 264px; height: 40px; bottom: -40px; }
  .sit-ab-icons { width: 296px; }
  .sit-ab-iconwrap { width: 136px; grid-template-rows: 77px auto; }
  .sit-ab-icon1 { width: 77px; height: 63px; }
  .sit-ab-icon2 { width: 77px; height: 49px; }
  .sit-ab-icon3 { width: 79px; height: 58px; }
  .sit-ab-icon4 { width: 44px; height: 57px; }
}