:root {
    --clr-primary-400: #007bff;
    --clr-primary-200: #66b2ff;
    --clr-neutral-900: #333;
    --clr-neutral-100: #f8f9fa;
    --clr-neutral-400: #ced4da;
    --clr-neutral-600: #6c757d;

    --ff-primary: sans-serif;

    --fw-regular: 400;
    --fw-bold: 700;

    --fs-400: 1rem;
    --fs-500: 1.125rem;
    --fs-600: 1.5rem;
    --fs-700: 2rem;
    --fs-800: 2.5rem;
}


*,
*::before,
*::after {
    box-sizing: border-box;
}

body,
h1,
h2,
h3,
p,
ul {
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--ff-primary);
    font-size: var(--fs-400);
    font-weight: var(--fw-regular);
    color: var(--clr-neutral-900);
    background-color: var(--clr-neutral-100);
    line-height: 1.6;
}

a {
    color: var(--clr-primary-400);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

img {
    max-width: 100%;
    display: block;
}


.container {
    width: min(90%, 70rem);
    margin-inline: auto;
}

header {
    background-color: var(--clr-primary-400);
    color: var(--clr-neutral-100);
    padding-block: 1rem;
}

header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

header .logo img {
    height: 50px;
}

header nav ul {
    list-style: none;
    display: flex;
    gap: 1rem;
}

header nav a {
    color: var(--clr-neutral-100);
    font-weight: var(--fw-bold);
    display: block;
    padding: 0.5rem;
    border-radius: 0.25rem;
    transition: background-color 0.3s ease;
}

header nav a:hover {
    background-color: var(--clr-primary-200);
    text-decoration: none;
}



.mobile-nav-toggle {
    display: none;
    background: transparent;
    border: 0;
    cursor: pointer;
    z-index: 1000;
}

.hamburger .line {
    transition: transform 300ms, opacity 200ms;
}

.mobile-nav-toggle[aria-expanded="true"] .hamburger .line.top {
    transform: translateY(20px) rotate(45deg);
}

.mobile-nav-toggle[aria-expanded="true"] .hamburger .line.middle {
    opacity: 0;
}

.mobile-nav-toggle[aria-expanded="true"] .hamburger .line.bottom {
    transform: translateY(-20px) rotate(-45deg);
}

@media (max-width: 767px) {
    header nav {
        position: fixed;
        z-index: 1000;
        inset: 0 0 0 30%;
        background: hsl(0 0% 0% / 0.1);
        backdrop-filter: blur(1rem);

        display: none;
        padding: min(30vh, 10rem) 2em;

    }

    header nav ul {
        flex-direction: column;
        align-items: flex-start;
    }

    header nav a {
        color: var(--clr-neutral-900);
    }

    .mobile-nav-toggle {
        display: block;
    }

    header[data-visible="true"] nav {
        display: block;
    }
}



main {
    padding-block: 2rem;
}



:root {
    
    --fs-base: 16px;
}

html {
    font-size: var(--fs-base);
}


@media (max-width: 600px) {
    html {
        font-size: 4vw;
    }
}

@media (min-width: 1900px) {
    html {
        font-size: 1.2vw;
    }
}


body {
    font-family: var(--ff-primary);
    font-size: 1rem;
    font-weight: var(--fw-regular);
    color: var(--clr-neutral-900);
    background-color: var(--clr-neutral-100);
    line-height: 1.6;
}

p {
    overflow-wrap: break-word;
    hyphens: auto;
    margin-bottom: 1rem;
    line-height: 1.7;
}



.content-section {
    margin-bottom: 2rem;
}

.content-section h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--clr-primary-400);
}

.content-section h4 {
    font-size: 1.25rem;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    color: var(--clr-neutral-900);
}

.content-section ul {
    list-style: disc;
    margin-left: 20px;
    margin-bottom: 1rem;
}


@media (max-width: 768px) {
    .section-list {
        grid-template-columns: 1fr;
    }

    body {
        font-size: 0.9rem;
    }

    .content-section h3 {
        font-size: 1.3rem;
    }
}

/* ... (Previous CSS) ... */

.logical-chain {
    font-weight: bold;
    color: var(--clr-primary-400);
    margin-bottom: 1rem;
    text-align: center;
    line-height: 1.8;
    white-space: pre-wrap;
}

.navigation {
    display: flex;
    width: 100%;
    justify-content: space-between;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--clr-neutral-400);
}

.nav-button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--clr-primary-400);
    color: white;
    text-decoration: none;
    border-radius: 0.25rem;
    transition: background-color 0.2s ease-in-out;
}

.nav-button:hover {
    background-color: var(--clr-primary-200);
}


.introduction {
    margin-bottom: 2rem;
    text-align: center;
}

.introduction h2 {
    font-size: var(--fs-700);
    margin-bottom: 1rem;
    color: var(--clr-primary-400);
}


.gsisom-structure h2 {
    font-size: var(--fs-700);
    margin-bottom: 1rem;
    text-align: center;
    color: var(--clr-primary-400);
}

.section-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.section-item {
    background-color: white;
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.section-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.section-item h3 {
    font-size: var(--fs-600);
    margin-bottom: 0.5rem;
    color: var(--clr-neutral-900);
}

.section-item h3 a.category-link {
    color: inherit;
    text-decoration: none;
}

.section-item h3 a.category-link:hover {
    color: var(--clr-primary-400);
    text-decoration: underline;
}

.section-item p {
    font-size: var(--fs-400);
    color: var(--clr-neutral-600);
    margin-bottom: 1rem;
}

.subcategory-list {
    list-style: none;
    padding-left: 1rem;
    margin-top: 0.5rem;
}

.subcategory-list li {
    margin-bottom: 0.25rem;
}

.subcategory-list li a.topic-link {
    color: var(--clr-primary-400);
    text-decoration: none;
    transition: color 0.3s;

}

.subcategory-list li a.topic-link:hover {
    color: var(--clr-primary-200);
    text-decoration: underline;
}


footer {
    background-color: var(--clr-neutral-900);
    color: var(--clr-neutral-100);
    padding-block: 1rem;
    text-align: center;
}

footer ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 0.5rem;
}

footer a {
    color: var(--clr-neutral-400);
}

footer a:hover {
    color: var(--clr-neutral-100);
}

/*  ... (之前的 style.css 代码) ...  */

/*  About Page Specific Styles  */

.about-page {
    padding-top: 2rem;
    /*  增加顶部内边距  */
}

.hero {
    text-align: center;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--clr-neutral-400);
}

.hero h2 {
    font-size: var(--fs-800);
    color: var(--clr-primary-400);
    margin-bottom: 1rem;
}

.hero .tagline {
    font-size: var(--fs-500);
    color: var(--clr-neutral-600);
    font-style: italic;
}

.introduction {
    margin-bottom: 3rem;
    line-height: 1.8; 
    max-width: 70ch; 
    margin-left: auto;
    margin-right: auto;

}

.introduction p {
    margin-bottom: 1em;
}

.introduction a {
    font-weight: var(--fw-bold);
}

.quote {
    background-color: var(--clr-neutral-200);
    padding: 1.5rem;
    margin: 2rem 0;
    border-left: 5px solid var(--clr-primary-400);
    font-style: italic;
    text-align: center; 
}

.quote p {
     margin-bottom: 0.5em;

}
.quote cite{
    font-size: var(--fs-400);
     color: var(--clr-neutral-600);
     font-style: normal; 
     display: block; 

}

.core-beliefs,
.community, .contact, .legal{
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--clr-neutral-400);

}
.contact {
    border-bottom: none; 
}

.core-beliefs h2,
.community h2, .contact h2, .legal h2{
    font-size: var(--fs-700);
    color: var(--clr-primary-400);
    margin-bottom: 1.5rem;
}

.core-beliefs ul,
.community ul, .contact ul {
    list-style: disc; 
    margin-left: 2rem;
    margin-bottom: 1rem;
}
.contact ul {
      list-style: none; 
      padding: 0;
}
.core-beliefs ul li,
.community ul li, .contact ul li {
    margin-bottom: 0.5rem;
}
.contact ul li strong{
     margin-right: 0.5em;
     display: inline-block;
     min-width: 130px; 
}

.legal p{
  font-size: var(--fs-400);
  color: var(--clr-neutral-600);
}