:root {
  --bs-body-bg: #fff;
  --bs-nav-bg:#eff1f480;
  --bs-banner-bg:#F3F3F3;
  --bs-main-red: #9C2034;
  --bs-main-gray: #4B4B4B;
  --bs-main-bg: #F5F5F5;
  --bs-block-bg: #e5e5e5;
  --bs-block2-bg:#e9ecef;
  --bs-main-book: #826642;
  --bs-main-blue: #0c52b9;
  --bs-main-font: #3C3C3E;
  --bs-red-ncku-01: #3F030D;
  --bs-red-ncku-02: #A41830;
  --bs-review-no:#D27D0E;
  --bs-green:#198754;
  --bs-red: #F82749;
  --bs-gray-100: #f8f9fa;
  --bs-gray-200: #e9ecef;
  --bs-gray-300: #dee2e6;
  --bs-gray-400: #ced4da;
  --bs-gray-500: #adb5bd;
  --bs-gray-600: #6c757d;
  --bs-gray-700: #495057;
  --bs-gray-800: #343a40;
  --bs-gray-900: #212529;
  --bs-yellow-100: rgb(255, 205, 0);
  --bs-red-ncku-01-rgb: 63, 3, 13;
  --bs-red-ncku-02-rgb: 164, 24, 48;
  --bs-red-ncku-03-rgb: 156, 32, 52;
  --bs-book-ncku-01-rgb: 130, 102, 66;
  --bs-gray-ncku-01-rgb: 84, 84, 88;
  --bs-gray-ncku-02-rgb: 225, 225, 225;
  --bs-gray-ncku-03-rgb: 243, 243, 243;
  --bs-yellow-100-rgb: 255, 205, 0;
  --bs-font-sans-serif:  -apple-system,  BlinkMacSystemFont, "MessinaSansTrial", "Microsoft JhengHei", "EudcKai"  , "EudcMing"  ,"Segoe UI",  "Roboto",  "Helvetica Neue", Arial, sans-serif,  "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  --bs-font-monospace: "MessinaSansTrial";
  --bs-body-font-family: var(--bs-font-sans-serif);
  --bs-border-color:#cbcbcb;
  --bs-main-font:#4c4c4c;
}

/* 文字及背景用色 */
.color-main-red {
  color:var(--bs-main-red);
}
.color-main-gray {
  color:var(--bs-main-gray) !important;
}
.color-main-font {
  color:var(--bs-main-font) !important;
}
.color-main-bg {
  color: var(--bs-main-bg);
}
.color-main-book {
  color: var(--bs-main-book);
}
.color-main-font {
  color: var(--bs-main-font);
}
.color-red-ncku-01 {
  color: var(--bs-red-ncku-01);
}
.color-red-ncku-02 {
  color: var(--bs-red-ncku-02);
}
.color-review-no {
  color: var(--bs-review-no);
}
.color-review-ok {
  color: var(--bs-review-ok);
}
.color-gray-500 {
  color:var(--bs-gray-500);
}
.color-gray-600 {
  color:var(--bs-gray-600);
}
.color-gray-700 {
  color:var(--bs-gray-700);
}
.color-gray-800 {
  color:var(--bs-gray-800);
}
.color-gray-900 {
  color:var(--bs-gray-900);
}
.bg-main-red {
  background: var(--bs-main-red);
}
.bg-main-gray {
  background: var(--bs-main-gray);
}
.bg-main-bg {
  background: var(--bs-main-bg);
}
.bg-nav-bg {
  background: var(--bs-nav-bg);
}
.bg-block {
  background: var(--bs-block-bg);
}
.bg-block2 {
  background: var(--bs-block2-bg);
}
.bg-banner {
  background: var(--bs-banner-bg);
}
.bg-main-bgcolor {
  background-color: var(--bs-main-bg);
}
.bg-main-book {
  background: var(--bs-main-book);
}
.bg-red-ncku-01 {
  background: var(--bs-red-ncku-01);
}
.bg-red-ncku-02 {
  background: var(--bs-red-ncku-02);
}
.bg-gray-500 {
  background: var(--bs-gray-500);
}
.bg-gray-600 {
  background: var(--bs-gray-600);
}
.bg-gray-700 {
  background: var(--bs-gray-700);
}
.bg-gray-800 {
  background: var(--bs-gray-800);
}
.bg-green {
  background: var(--bs-green);
}
.bg-gray-900 {
  background: var(--bs-gray-900);
}
.border-main {
  border-color: var(--bs-main-bg);
}
.bolder-gray {
  border-color: var(--bs-main-gray)!important;
}
.bolder-book {
  border: 2px dashed #826642;
}
body {
  margin: 0;
  font-family: -apple-system,  BlinkMacSystemFont, "MessinaSansTrial", "Microsoft JhengHei", "EudcKai"  , "EudcMing"  ,"Segoe UI",  "Roboto",  "Helvetica Neue", Arial, sans-serif,  "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  font-size: 1.2rem;
  font-weight: var(--bs-body-font-weight);
  line-height: var(--bs-body-line-height);
  color: var(--bs-main-font);
  text-align: var(--bs-body-text-align);
  background: #FAFAFA;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}
/* @media (min-width: 1000px) {
  body {
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: center;
  }
}
 */

html, body {
  height: 100%;     /* 讓 flex 可以撐滿整頁 */
  margin: 0;
}

body {
  display: flex;
  flex-direction: column; /* 垂直排列內容 */
}
main {
  flex: 1; /* 撐開中間區域，推 footer 到底 */
  display: flex;
  justify-content: center; /* 水平置中 main 內容 */
  align-items: flex-start;     /* 垂直置中 main 內容 (可拿掉) */
}

footer {
  text-align: center;
  padding: 1rem;
  background: var(--bs-nav-bg);
}

a {
  color: var(--bs-main-font);
  font-weight: 400;    
  text-decoration-color: #151515;
  text-underline-offset: 5px;
  text-decoration-thickness: 2px;
  line-height: 1.5;
  text-decoration: none;
}
p {
  color: var(--bs-main-font);
}

@media (min-width: 1400px) {
    .container-xxl, .container-xl, .container-lg, .container-md, .container-sm, .container {
        max-width: 1600px !important;
    }
  }

#main_nav {
  margin: 20px 5px;
  padding: 5px;
  border-radius: 90px;
  backdrop-filter: blur(8px);
  background-color: #eff1f4d4;
}
.banner-title {
  margin: 10px 5px;
  padding: 20px 50px;
  border-radius: 20px;
  backdrop-filter: blur(5px);
  background-color: #f1f4f875;
  color: var(--bs-red-ncku-01);
  }
.nav-link {
  color: var(--bs-red-ncku-01);
  font-size: 1.2rem;
  padding: 0px;
}
.nav-item {
  border-left: 1px solid #43030e;
  padding: 0px 5px;
}
.nav-item-right {
  border-right: 1px solid #43030e;
}
#main_nav .nav-item .nav-link:hover {
  color:var(--bs-main-red);
  background: #f5f5f5;
}
.nckulogo {
  width:200px;
  padding: 10px;
}
@media (min-width: 400px) {
  .nckulogo {
    width: 250px;
    padding-left:15px;
  }
  .nckulogo2 {
    padding-bottom: 20px;
  }
  }
@media (max-width: 600px) {
  .nckulogo2 {
    width: 80%;
    padding-bottom: 20px;
  }
}
.mit-logo {
  left: 38px;
  width: 219px;
  height: 49px;
}


/* banner */
.img-banner {
  height: 100%;
  width: 100%;
  box-shadow: 0 10px 15px rgba(0, 0, 0, .2);
}
.img-banner-svg {
  height: 100%;
  width: 100%;
}

.footer-icon {color:#f5f5f5;}
.btn-scroll-top.show {
  bottom: 1.25rem;
  opacity: 1;
}
.btn-scroll-top {
  position: fixed;
  display: flex;
  align-items: center;
  justify-content: center;
  right: 1.25rem;
}
.icon-bg {
  background: #f5f5f5;
  border-radius: 90px;
  padding: 20px;
}
.lang-bg {
  background: #420a15;
  color: #fff;
  text-decoration: none;
  padding: 3px 5px 3px 5px;
  margin: 3px;
  font-size: 1rem;
}
.blockquote {
  padding: 10px 20px;
  border-left: 5px solid #420a15;
  background: #f5f5f5;
}

.bottom-column {
  position: relative;
}
.bottom-column:before {
  -webkit-transform: translateX(-50%);
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 100vw;
  height: 1px;
  transform: translate(-50%);
  background-color: #e5e9efcc;
  content: "";
}
.public_bg {
  background-color: #eff1f4d4;
  padding: 50px 70px;
  border-radius: 20px;
}
@media (max-width: 600px) {
  .public_bg {
    background-color: #eff1f4d4;
    padding: 20px;
    border-radius: 20px;
  }
}
.news_list {
  align-items: center;
  border-top: 1px solid rgba(229, 233, 239, .8);
}
.news_list_last {
  border-bottom: 1px solid rgba(229, 233, 239, .8);
}
.banner-h {
  min-height: 300px;
}
.banner-index {
  min-height: 300px;
}
.issue_title {
  padding: 5px;
  border-radius: 90px;
  backdrop-filter: blur(8px);
  background-color: #eff1f4d4;
}
.issue_btu {
  width: 75px;
  background: #efece3;
  border: 5px solid #ffffff91;
}
.carousel-indicators [data-bs-target] {
  width: 50px;
  height: 3px;
  background-color: #43030e;
}
.carousel-indicators {
    margin-bottom: .3rem;
}
@media (min-width:600px) {
  .carousel-indicators [data-bs-target] {
    width: 80px;
    height: 6px;
    background-color: #43030e;
    margin-bottom: 1rem;
}
}
@media (max-width:768px) {
  .nav-item {
      border-left: 0px;
      border-top: 1px solid #43030e57;
      padding: 10px 5px;
  }
  .nav-item-right {
    border-right: 0px;
    border-bottom: 1px solid #43030e57;
  }
}