/* ============================================
   Responsive visibility utilities
   Breakpoints: main (>991), medium (992–768), small (768–480), tiny (≤479)
   ============================================ */

.hidden-main {
  display: none !important;
}

@media screen and (max-width: 991px) {
  .hidden-main {
    display: inherit !important;
  }
  .hidden-medium {
    display: none !important;
  }
}

@media screen and (max-width: 767px) {
  .hidden-main {
    display: inherit !important;
  }
  .hidden-medium {
    display: inherit !important;
  }
  .hidden-small {
    display: none !important;
  }
}

@media screen and (max-width: 479px) {
  .hidden-main {
    display: inherit !important;
  }
  .hidden-medium {
    display: inherit !important;
  }
  .hidden-small {
    display: inherit !important;
  }
  .hidden-tiny {
    display: none !important;
  }
}

/* ============================================
   Base styles
   ============================================ */

.body {
  background-color: #fdfdfd;
  font-family: Sfcompactdisplay, sans-serif;
  color: #2f2f2f;
  font-size: 16px;
  font-weight: 400;
  padding-bottom: 10%;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.nav_links {
  display: flex;
  margin-top: 5px;
  margin-bottom: 5px;
  padding-top: 5px;
  padding-right: 10px;
  padding-bottom: 5px;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  flex: 0 auto;
  color: #888;
  line-height: 16px;
  text-decoration: none;
  text-transform: none;
}

/* w--current: applied dynamically by scroll-spy (nav.js) */
.nav_links.w--current {
  border-radius: 15px;
  color: #2f2f2f;
  font-weight: 500;
}

.nav_links.sub-transition {
  margin-top: 2px;
  margin-bottom: 2px;
  margin-left: 30px;
  padding-top: 5px;
  padding-bottom: 5px;
  flex-direction: column;
  justify-content: flex-start;
  align-items: flex-start;
  font-size: 0.8em;
  line-height: 1em;
}

.nav_mobile {
  position: fixed;
  left: 0px;
  top: 0px;
  bottom: 0px;
  z-index: 2;
  display: flex;
  height: 44px;
  padding-right: 40px;
  padding-left: 40px;
  flex-direction: row;
  justify-content: center;
  flex-wrap: nowrap;
  align-items: center;
  align-content: space-between;
  background-color: #000;
  font-weight: 600;
}

.title {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.title_text {
  color: #2f2f2f;
  font-size: 2em;
  line-height: 1em;
  font-weight: 700;
  letter-spacing: -2px;
  text-transform: uppercase;
}

.title_container {
  margin-left: auto;
  margin-right: auto;
  max-width: 940px;
}

.section {
  padding-top: 20px;
  border-radius: 40px;
}

.item_title_container {
  display: flex;
  margin-top: 20px;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px dotted #fff;
  color: #2f2f2f;
  font-size: 1.5em;
  font-weight: 600;
}

.item_container {
  margin-left: 20px;
}

.definition {
  margin-top: 10px;
  margin-left: 20px;
  font-size: 1em;
}

.example {
  margin-top: 10px;
  margin-bottom: 10px;
  margin-left: 50px;
  color: #888;
  font-size: 0.8em;
}

.credit {
  color: #2f2f2f;
  font-size: 0.8em;
  line-height: 0.75em;
  text-transform: uppercase;
}

.link {
  color: #2f2f2f;
  font-style: italic;
  font-weight: 700;
  text-decoration: none;
}

.consider {
  color: #888;
  text-align: right;
}

.contact-bubble {
  position: fixed;
  left: 8vw;
  bottom: 25px;
  z-index: 2;
  width: 40px;
  height: 40px;
  border-radius: 100%;
  background-color: #2f2f2f;
}

.image-2 {
  width: 60%;
  height: 60%;
}

.link-block-2 {
  display: flex;
  width: 100%;
  height: 100%;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.side-bar {
  position: fixed;
  left: 0px;
  top: 0px;
  bottom: 0px;
  display: flex;
  width: 22vw;
  height: 100vh;
  margin-left: 8vw;
  flex-direction: column;
  justify-content: center;
  align-items: stretch;
}

.nav_desktop {
  display: flex;
  width: 100%;
  flex-direction: column;
  justify-content: flex-start;
  flex-wrap: nowrap;
  align-items: flex-start;
  font-weight: 300;
}

.page-container {
  width: 60vw;
  margin-right: 8vw;
  margin-left: auto;
  padding: 40px 30px 0px;
}

.nav_links_desktop {
  padding-top: 2px;
  padding-bottom: 2px;
}

.structures_category {
  margin: 20px -20px;
  padding-right: 20px;
  padding-left: 20px;
  border: 2px solid #888;
  border-radius: 30px;
}

.category-name_english {
  font-size: 1.2em;
  line-height: 1.5em;
  text-transform: lowercase;
}

.category-name_chinese {
  color: #888;
  font-size: 0.8em;
  line-height: 1.2em;
}

.category-button {
  display: flex;
  margin-right: -20px;
  margin-left: -20px;
  padding: 20px 10px 20px 20px;
  flex-direction: column;
  border-top-left-radius: 30px;
  border-top-right-radius: 30px;
  font-weight: 500;
  cursor: pointer;
}

.category-content {
  margin-right: -20px;
  margin-bottom: 20px;
  margin-left: -20px;
  padding-right: 20px;
  padding-left: 20px;
  border-top: 2px dotted #888;
}

.section-title {
  margin-right: -20px;
  margin-left: -20px;
  padding: 20px;
  border-radius: 30px;
  background-color: #2f2f2f;
  background-image: none;
  color: #fdfdfd;
  font-size: 1.5em;
  font-weight: 500;
}

.logo-container {
  position: fixed;
  left: 8vw;
  top: 60px;
}

/* ============================================
   Tablet (max-width: 991px)
   ============================================ */

@media (max-width: 991px) {
  .body {
    font-size: 14px;
  }
  .nav_links {
    font-size: 0.9em;
  }
  .nav_mobile {
    margin-right: 10vw;
    margin-left: 10vw;
    padding-right: 0px;
    padding-left: 0px;
    justify-content: center;
  }
  .title_text {
    font-size: 2em;
  }
  .title_container {
    max-width: 728px;
  }
  .credit {
    line-height: 0.75em;
    text-transform: uppercase;
  }
  .consider {
    text-align: right;
  }
  .contact-bubble {
    left: 3vw;
  }
  .side-bar {
    width: 30vw;
    height: 100vh;
    margin-left: 3vw;
  }
  .nav_desktop {
    position: static;
    padding-right: 0px;
    padding-left: 0px;
    justify-content: center;
  }
  .page-container {
    width: 64vw;
    margin-right: 3vw;
  }
  .category-name_english {
    font-size: 1.5em;
  }
  .logo-container {
    left: 3vw;
  }
}

/* ============================================
   Small (max-width: 767px)
   ============================================ */

@media (max-width: 767px) {
  .body {
    padding-right: 0vw;
    padding-left: 0vw;
  }
  .nav_mobile_row {
    display: flex;
    width: 100%;
    height: 100%;
    justify-content: center;
    align-items: center;
  }
  .nav_mobile_link-container {
    width: 25%;
    justify-content: center;
    align-items: center;
  }
  .rotate {
    display: flex;
    width: 100vw;
    height: 100vh;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-image: url("../images/icon_rotate.png");
    background-position: 50% 50%;
    background-size: 20vw;
    background-repeat: no-repeat;
  }
}

/* ============================================
   Mobile (max-width: 479px)
   ============================================ */

@media (max-width: 479px) {
  .body {
    font-family: Sfcompactdisplay, sans-serif;
  }
  .nav_links {
    display: flex;
    width: 100%;
    height: 100%;
    padding: 15px 0px;
    justify-content: center;
    align-items: center;
    transform: rotate(0deg);
    color: #888;
    font-size: 1em;
    text-align: center;
  }
  .nav_links.w--current {
    align-items: center;
    border-bottom-left-radius: 0px;
    border-bottom-right-radius: 0px;
    background-color: #2f2f2f;
    color: #fff;
    font-weight: 400;
  }
  .nav_links.w--current:focus {
    background-color: #2f2f2f;
  }
  .logo-container {
    display: none;
  }
  .nav_mobile {
    position: fixed;
    left: 0px;
    top: calc(100vh - 440px - 30px - 15vh);
    bottom: auto;
    width: 440px;
    height: 30px;
    margin-right: 0vw;
    margin-left: 0vw;
    padding-right: 0px;
    padding-left: 0px;
    flex-wrap: nowrap;
    align-items: center;
    background-color: transparent;
    transform: rotate(90deg) translate(0px, 0px);
    transform-origin: 0% 100%;
    font-weight: 400;
  }
  .nav_mobile_row {
    display: flex;
    width: 100%;
    height: 100%;
    justify-content: center;
    align-items: center;
    font-size: 0.8em;
  }
  .nav_mobile_link-container {
    display: flex;
    height: 100%;
    padding-right: 0px;
    padding-left: 0px;
    flex-direction: column;
    justify-content: center;
    align-items: stretch;
  }
  .title {
    position: relative;
    z-index: 2;
    display: flex;
    padding-top: 50px;
    flex-direction: row;
    justify-content: flex-start;
    align-items: flex-end;
    text-decoration: none;
  }
  .title_text {
    text-align: left;
  }
  .title_container {
    flex: 1;
    max-width: none;
    text-transform: uppercase;
  }
  .item_title_container {
    display: flex;
    margin-top: 10px;
    margin-right: -10px;
    padding: 5px 10px;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px dotted #fff;
    font-size: 1.2em;
  }
  .item_title {
    font-size: 1.2em;
  }
  .item_container {
    margin-left: 0px;
  }
  .definition_eng {
    margin-bottom: 2px;
  }
  .example_eng {
    margin-bottom: 2px;
    font-style: italic;
  }
  .example {
    margin-left: 40px;
    padding-top: 5px;
    padding-bottom: 5px;
    padding-left: 0px;
  }
  .example_cht {
    margin-bottom: 2px;
    font-style: italic;
  }
  .definition_cht {
    margin-bottom: 2px;
    font-size: 1em;
  }
  .credit {
    text-align: left;
  }
  .link {
    color: #2f2f2f;
  }
  .consider {
    margin-bottom: 10px;
    font-style: italic;
  }
  .text-block-3 {
    font-weight: 500;
  }
  .contact-bubble {
    position: fixed;
    left: 30px;
    bottom: 30px;
    width: 40px;
    height: 40px;
    justify-content: center;
    align-items: center;
    border-radius: 100%;
    background-color: #2f2f2f;
  }
  .image-2 {
    width: 60%;
    height: 60%;
  }
  .link-block-2 {
    display: flex;
    width: 100%;
    height: 100%;
    justify-content: center;
    align-items: center;
  }
  .nav_desktop {
    position: fixed;
    left: 0px;
    top: auto;
    bottom: auto;
    width: 66.66vh;
    height: 30px;
    margin-right: 0vw;
    margin-left: 0vw;
    padding-right: 0px;
    padding-left: 0px;
    flex-wrap: nowrap;
    align-items: center;
    background-color: transparent;
    transform: rotate(90deg);
    transform-origin: 0% 100%;
  }
  .page-container {
    width: auto;
    margin-right: 0vw;
    margin-left: 0vw;
    padding-right: 10px;
    padding-left: 50px;
  }
  .sidebar_container {
    flex: 1;
    text-transform: uppercase;
  }
  .structures_category {
    margin-right: -10px;
    margin-left: 0px;
    border-right-style: none;
    border-top-right-radius: 0px;
    border-bottom-right-radius: 0px;
  }
  .category-name_english {
    font-size: 1em;
    text-transform: uppercase;
  }
  .category-name_chinese {
    line-height: 1.5em;
  }
  .category-content {
    margin-left: -20px;
    padding-left: 10px;
    display: none;
  }
  .category-content.is-open {
    display: block;
  }
  .category-button {
    position: relative;
  }
  .category-button::after {
    content: "+";
    font-size: 1.5em;
    font-weight: 300;
    color: #888;
    position: absolute;
    right: 20px;
    align-self: center;
  }
  .category-button.is-open::after {
    content: "\2212";
  }
  .section-title {
    margin-right: -10px;
    margin-left: 0px;
    padding-top: 10px;
    padding-bottom: 10px;
    border-top-right-radius: 0px;
    border-bottom-right-radius: 0px;
    background-image: none;
    font-size: 1.2em;
    font-weight: 400;
  }
}

/* ============================================
   Fonts
   ============================================ */

@font-face {
  font-family: "Sfcompactdisplay";
  src: url("../fonts/SFCompactDisplay-Regular.otf") format("opentype");
  font-weight: 400;
  font-style: normal;
}
@font-face {
  font-family: "Sfcompactdisplay";
  src: url("../fonts/SFCompactDisplay-Light.otf") format("opentype");
  font-weight: 300;
  font-style: normal;
}
@font-face {
  font-family: "Sfcompactdisplay";
  src: url("../fonts/SFCompactDisplay-Medium.otf") format("opentype");
  font-weight: 500;
  font-style: normal;
}
@font-face {
  font-family: "Sfcompactdisplay";
  src: url("../fonts/SFCompactDisplay-Bold.otf") format("opentype");
  font-weight: 700;
  font-style: normal;
}
@font-face {
  font-family: "Sfcompactdisplay";
  src: url("../fonts/SFCompactDisplay-Semibold.otf") format("opentype");
  font-weight: 600;
  font-style: normal;
}