@font-face {
    font-family: 'MyriadPro';
    src: url('../fonts/MyriadPro-Regular.otf');
    font-weight: 400;
}

@font-face {
    font-family: 'MyriadPro';
    src: url('../fonts/MyriadPro-Regular.otf');
    font-weight: 600;
}

@font-face {
    font-family: 'MyriadPro';
    src: url('../fonts/MyriadPro-Regular.otf');
    font-weight: 700;
}

@font-face {
    font-family: 'SourceHanSansHC';
    src: url('../fonts/SourceHanSansHC-Regular.otf');
    font-weight: 400;
}

@font-face {
    font-family: 'SourceHanSansHC';
    src: url('../fonts/SourceHanSansHC-Medium.otf');
    font-weight: 600;
}

@font-face {
    font-family: 'SourceHanSansHC';
    src: url('../fonts/SourceHanSansHC-Heavy');
    font-weight: 700;
}

:root {
    --bs-light-color: #ffffff;
    --bs-dark-color: #222222;
    --primary-navy-color: #273582;
    --primary-navy-rgb: 40, 53, 131;
    --primary-magenta-color: #da5083;
    --primary-magenta-rgb: 219, 81, 132;
    --primary-tiffany-color: #38b1b9;
    --primary-tiffany-rgb: 57, 178, 185;
    --primary-blue-color: #489ed8;
    --primary-blue-rgb: 72, 159, 216;
    --primary-orange-color: #f39200;
    --primary-orange-rgb: 243, 146, 0;
    --primary-purple-color: #6f2282;
    --primary-purple-rgb: 110, 33, 130;

    --cover-width: 300px;
    --cover-height:425px;
    --cover-side-width: 27px;
}

.primary-navy-color {
    color: var(--primary-navy-color) !important;
}

.primary-magenta-color {
    color: var(--primary-magenta-color) !important;
}

.primary-tiffany-color {
    color: var(--primary-tiffany-color) !important;
}

.primary-blue-color {
    color: var(--primary-blue-color) !important;
}

.primary-orange-color {
    color: var(--primary-orange-color) !important;
}

.primary-purple-color {
    color: var(--primary-purple-color) !important;
}

.primary-bg-navy-color {
    background-color: var(--primary-navy-color) !important;
}

.primary-bg-magenta-color {
    background-color: var(--primary-magenta-color) !important;
}

.primary-bg-tiffany-color {
    background-color: var(--primary-tiffany-color) !important;
}

.primary-bg-blue-color {
    background-color: var(--primary-blue-color) !important;
}

.primary-bg-orange-color {
    background-color: var(--primary-orange-color) !important;
}

.primary-bg-purple-color {
    background-color: var(--primary-purple-color) !important;
}

.border-navy-color {
    border-color: var(--primary-navy-color) !important;
}

.border-magenta-color {
    border-color: var(--primary-magenta-color) !important;
}

.border-tiffany-color {
    border-color: var(--primary-tiffany-color) !important;
}

.border-blue-color {
    border-color: var(--primary-blue-color) !important;
}

.border-orange-color {
    border-color: var(--primary-orange-color) !important;
}

.border-purple-color {
    border-color: var(--primary-purple-color) !important;
}

.max-80 {
    max-width: 80% !important;
}

html,
body {
    margin: 0;
    padding: 0;
    font-size: 16px;
    font-family: 'MyriadPro', serif;
    counter-reset: chapter;
}

html.zh-tw,
html.zh-tw body {
    font-family: 'SourceHanSansHC', sans-serif;
}

#cover {
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    background: url('../img/cover-background.webp') repeat center center / auto;
}
.container .book {
    position: relative;
    display: block;
    width: var(--cover-width);
    height: var(--cover-height);
    margin: 5% auto;
    border-radius: 2px 4px 4px 2px;
    background: linear-gradient(45deg, #DAD5DC 0%, #f2ebf4 100%);
    font-family: acumin-pro, sans-serif;
    -webkit-box-shadow: 13px 13px 8px 0px rgba(151, 146, 153, 0.6);
    -moz-box-shadow: 13px 13px 8px 0px rgba(151, 146, 153, 0.6);
    box-shadow: 13px 13px 8px 0px rgba(151, 146, 153, 0.6);
    font-weight: 400;
    color: #2b2b2b;
    -webkit-transform-style: preserve-3d;
    -moz-transform-style: preserve-3d;
    transform-style: preserve-3d;
    -webkit-transition: -webkit-transform .5s;
    -moz-transition: -moz-transform .5s;
    transition: transform .5s;
}
.container .book:hover {
    -webkit-transform: rotate3d(0, 1, 0, 35deg);
    -moz-transform: rotate3d(0, 1, 0, 35deg);
    transform: rotate3d(0, 1, 0, 35deg);
}
.container .book>div,
.container .front>div {
    display: block;
    position: absolute;
}
.container .front {
    -webkit-transform-style: preserve-3d;
    -moz-transform-style: preserve-3d;
    transform-style: preserve-3d;
    -webkit-transform-origin: 0% 50%;
    -moz-transform-origin: 0% 50%;
    transform-origin: 0% 50%;
    -webkit-transition: -webkit-transform .5s;
    -moz-transition: -moz-transform .5s;
    transition: transform .5s;
    -webkit-transform: translate3d(0, 0, 20px);
    -moz-transform: translate3d(0, 0, 20px);
    transform: translate3d(0, 0, 20px);
    z-index: 10;
}
.container .front>div {
    width: var(--cover-width);
    height: var(--cover-height);
}

.container .left-side {
    width: var(--cover-side-width);
    left: -20px;
    height: var(--cover-height);
    background-color: rgba(232, 229, 234);
    -webkit-transform: rotate3d(0, 1, 0, -90deg);
    -moz-transform: rotate3d(0, 1, 0, -90deg);
    transform: rotate3d(0, 1, 0, -90deg);
    background: url(../img/cover-side.webp) no-repeat center center / cover;
}

.container .front>div {
    border-radius: 0 3px 3px 0;
    box-shadow:
        inset 4px 0 10px rgba(0, 0, 0, 0.1);
}

.container .front:after {
    content: '';
    position: absolute;
    top: 1px;
    bottom: 1px;
    left: -1px;
    width: 1px;
}

.container .cover:after {
    content: '';
    position: absolute;
    top: 0;
    left: 10px;
    bottom: 0;
    width: 3px;
    background: rgba(0, 0, 0, 0.1);
    box-shadow: 1px 0 3px rgba(255, 255, 255, 0.1);
}

.cover {
    background: url(../img/cover.webp) no-repeat center center / cover;
}



@media(min-width:576px) {
    :root {
        --cover-width: 400px;
        --cover-height:566px;
        --cover-side-width: 36px;
    }
}

@media(min-width:992px) {
    :root {
        --cover-width: 424px;
        --cover-height:600px;
        --cover-side-width: 38px;
    }

}

#nav-hamburger {
    position: fixed;
    top: 5%;
    right: 10px;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 100%;
    z-index: 99;
}

#nav-hamburger svg {
    width: 100%;
    height: auto;
}

#lang-ul,
#ebook-nav-ol,
.ebook-subnav-ol {
    list-style: none;
    margin: 0;
    padding: 0;
}

#lang-ul {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 1.2rem;
}

#lang-ul li {
    text-align: center;
    min-width: 6rem;
    background-color: var(--primary-tiffany-color);
    border: 1px var(--primary-tiffany-color) solid;
    padding: 0.8rem 0.5rem 0.5rem;
}

#lang-ul li.active {
    background-color: #ffffff;
}

#lang-ul li a {
    color:#ffffff;
    text-decoration: none;
    /* padding: 0.8rem 0.5rem 0.5rem; */
}
#lang-ul li.active a {
    color:var(--primary-tiffany-color);
    font-weight: 700;    
    text-decoration: none;
}

.ebook-subnav-ol {
    margin-left: 1.4rem;
}

#ebook-nav-ol>li {
    margin-bottom: 0.8rem;
    counter-reset: subchapter;
}

.ebook-subnav-ol>li {
    margin-bottom: 0.8rem;
}

#ebook-nav-ol>li a {
    font-size: 1.2rem;
    text-decoration: none;
}

.ebook-subnav-ol>li a {
    font-size: 1.2rem;
    text-decoration: none;
}

#ebook-nav-ol>li a::before {
    counter-increment: chapter;
    content: "0" counter(chapter);
    font-size: 3rem;
    font-weight: 700;
    display: block;
    line-height: 1;
}

#ebook-nav-ol>li>.ebook-subnav-ol>li a::before {
    counter-increment: subchapter;
    content: counter(chapter) "." counter(subchapter);
    font-size: 1.2rem;
    font-weight: 700;
    display: inline-block;
    margin-right: 1rem;
}
#ebook-nav-ol li.no-bullet a::before {
    content: "" !important;
    margin-right: 0 !important;
}
html.zh-tw #ebook-nav-ol>li:last-child a::before {
    content: "附錄";
}
html.en-us #ebook-nav-ol>li:last-child a::before {
    content: "Appendix";
}

#ebook-nav-ol>li:nth-child(odd) a {
    color: var(--primary-blue-color);
}

#ebook-nav-ol>li:nth-child(even) a {
    color: var(--primary-magenta-color);
}

#ebook-nav-ol>li:nth-child(5) a {
    color: var(--primary-tiffany-color);
}
#ebook-subnav-ol li.no-bullet a::before {
    content: "" !important;
    margin-right: 0 !important;
}

.hero-section {
    position: relative;
    width: 100%;
    margin: 0;
    padding: 0;
}

.hero-img {
    /*aspect-ratio: 16/9;*/
    object-fit: cover;
    object-position: center;
}

.hero-overlay-caption {
    position: absolute;
    top: 0;
    left: 0;
    padding-left: 4%;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    width: 100%;
    height: 90%;
}

.en-us .hero-overlay-caption {
    position: absolute;
    top: -20px;
    left: 0;
    padding-left: 4%;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    width: 100%;
    height: 90%;
}

.hero-overlay-img {
    position: absolute;
    top: 0;
    left: 0;
}

.hero-overlay-caption h1 {
    font-size: 6vw;
    color: var(--bs-light-color);
    text-shadow: 2px 2px 2px rgba(0, 0, 0.8);
    z-index: 5;
}

.hero-author {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 100%;
    padding: 3%;
    text-align: right;
    color: var(--bs-light-color);
    font-size: 3vw;
    text-shadow: 2px 2px 2px rgba(0, 0, 0.8);
    z-index: 6;
}

@media (min-width:576px) {
    .hero-author {
        font-size: 2.4vw;
    }
}

@media (min-width:992px) {
    .hero-author {
        font-size: 1.4vw;
    }
}

@media (min-width:1200px) {
    .hero-author {
        font-size: 1vw;
    }
}

.spread-overlay-text {
    position: relative;
}

.spread-img {
    aspect-ratio: 16/9;
    object-fit: cover;
    object-position: center top;
}
.overlay-caption {
    position: relative;
}
@media (min-width:992px) {
    .overlay-caption {
        position: absolute;
        top: 0;
        left: 0;
        padding-left: 4%;
        display: flex;
        align-items: center;
        justify-content: flex-start;
        width: 100%;
        height: 100%;
    }
}

blockquote svg {
    width: 3rem;
    height: auto;
    display: inline-block;
    margin: 0.5rem;
    vertical-align: baseline;
    transform: rotate(180deg);
}

blockquote.content-quote {
    position: relative;
    margin: 0 1.8rem 1rem;
}
blockquote.content-quote svg {
    position: absolute;
    width: 1.5rem;
    top:-1rem;
    left:-2.2rem;
}
blockquote svg.end-quote {
    position: relative;
    top:0;
    left:0;
    transform: rotate(0deg);
}
blockquote svg.end-quote:last-child {
    vertical-align: top;
}

blockquote.magenta svg .st0 {
    fill: var(--primary-magenta-color);
}

blockquote.blue svg .st0 {
    fill: var(--primary-blue-color);
}

blockquote.tiffany svg .st0 {
    fill: var(--primary-tiffany-color);
}

blockquote.navy svg .st0 {
    fill: var(--primary-navy-color);
}

blockquote.orange svg .st0 {
    fill: var(--primary-orange-color);
}

blockquote.white svg .st0 {
    fill: var(--bs-light-color);
}

/*
blockquote {
    position: relative;
}
blockquote:before,
blockquote:after {
	position: absolute;
	color: inherit;
	font-size: 8rem;
	width: 4rem;
	height: 4rem;
    line-height: 1;
}
blockquote.navy:before,
blockquote.navy:after {
	color: var(--primary-navy-color);
}

blockquote:before {
	content: '“';
	left: -5rem;
	top: -2rem;
}

blockquote:after {
	content: '”';
	right: -5rem;
	bottom: -2rem;
}
blockquote.start:after {
    display: none;
}
blockquote.end::before{
    display: none;
}
*/

.chapter-num {
    font-size: 120%;
}

.standard-grid {
    padding: 5rem 0;
}

.avatar-name {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 1rem;
}

.avatar-name img {
    width: 100%;
    max-width: 180px;
}

.avatar-name p {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.avatar-name p span {
    line-height: 1;
    font-size: 1.4rem;
    display: block;
}

.avatar-name p span:first-child {
    font-size: 1rem;
}
.en-us .avatar-name p span:first-child {
    font-size: 1.4rem;
}
.en-us .avatar-name p :not(span:first-child) {
    font-size: 1rem;
}

figcaption {
    font-size: 0.8rem;
    margin-top: 0.5rem;
}

.responsive-table {
    width: 100%;
    overflow-x: scroll;
}

.ratio-square {
    aspect-ratio: 1/1;
    object-fit: cover;
    object-position: center;
}

.ratio3-4 {
    aspect-ratio: 3/4;
    object-fit: cover;
    object-position: center;
}

.ratio4-3 {
    aspect-ratio: 4/3;
    object-fit: cover;
    object-position: center;
}
.ratio16-6 {
    aspect-ratio: 16/6;
    object-fit: cover;
    object-position: center;
}

.ratio16-9 {
    aspect-ratio: 16/9;
    object-fit: cover;
    object-position: center;
}

/** override swiper ***/
.swiper-button-next,
.swiper-button-prev {
    width: 4rem;
    height: 4rem;
    background-color: rgba(255, 255, 255, 0.8);
    border-radius: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.swiper-button-next:after,
.swiper-button-prev:after {
    color: var(--primary-blue-color);
}

.swiper-pagination-bullet-active {
    background: var(--primary-blue-color);
}

.footer-section-nav {
    margin-bottom: 3rem;
}
.footer-section-nav a {
    display: flex;
    color: var(--bs-light-color);
    background-color: var(--primary-blue-color);
    font-size: 0.8rem;
    text-decoration: none;
    padding:0.6rem 1rem;
    border-radius: 0.8rem;
    text-align: center;
    align-items: center;
    justify-content: space-between;
}
.footer-section-nav a:hover {
    background-color: var(--primary-tiffany-color);
}

.info-box p {
    margin-bottom: 0;
    text-align: center;
}

.restart-class {
    display:none;
}

.column-text-1 {
    columns: 1;
}

.unset-ratio {
    aspect-ratio: unset;
}

.superscripts{
    vertical-align:super;
}

@media (min-width:768px) {
    .column-text-md-2 {
        columns: 2;
        gap: 3rem;
    }
}

#backtotop {
    display: none;
    position: fixed;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    bottom: 5rem;
    right: 2rem;
    z-index: 10;
    transition: all 0.8s ease-in-out;
  }

.en-us #ebook-nav-ol>li a::before {
    font-family: 'SourceHanSansHC', sans-serif;
}

.en-us #ebook-nav-ol>li>.ebook-subnav-ol>li a::before {
    font-family: 'SourceHanSansHC', sans-serif;
}