html {
    scroll-behavior: smooth;
}

.body-preface {
    background: #f3e7d2;
    color: #251d16;
}

.body-preface .page-container {
    max-width: none;
    padding: 0;
}

.body-preface main.pb-3 {
    padding-bottom: 0 !important;
}

.body-preface footer {
    background: #eadac0;
    border-top: 1px solid rgba(169, 143, 105, 0.45);
}

.body-preface header {
    background: rgba(252, 248, 240, 0.96);
    border-bottom: 1px solid rgba(178, 151, 111, 0.58);
    box-shadow: 0 3px 18px rgba(56, 42, 25, 0.12);
}

.body-preface .navbar {
    min-height: 64px;
}

.body-preface .navbar .container-fluid {
    max-width: 1640px;
    padding-left: 34px !important;
    padding-right: 34px !important;
}

.body-preface .navbar-brand {
    color: #201913 !important;
    font-family: KaiTi, STKaiti, "Songti SC", SimSun, serif;
    font-size: 1.55rem;
    font-weight: 700;
}

.body-preface .navbar-brand::before {
    background: #a7352b;
    box-shadow: inset 0 0 0 2px rgba(255, 246, 229, 0.86);
    color: #fff8ea;
    content: "卢";
    display: inline-flex;
    font-family: KaiTi, STKaiti, "Songti SC", SimSun, serif;
    font-size: 1.15rem;
    font-weight: 700;
    height: 30px;
    justify-content: center;
    line-height: 30px;
    margin-right: 13px;
    vertical-align: 1px;
    width: 30px;
}

.body-preface .navbar-nav .nav-link {
    background: transparent !important;
    border: 0 !important;
    border-radius: 0;
    color: #251d16 !important;
    font-family: KaiTi, STKaiti, "Songti SC", SimSun, serif;
    font-size: 1.07rem;
    font-weight: 700;
    min-height: auto;
    padding: 8px 9px 10px;
}

.body-preface .navbar-nav .nav-link:hover,
.body-preface .navbar-nav .nav-link.is-active {
    background: transparent !important;
    color: #8f2d27 !important;
}

.body-preface .navbar-nav .nav-link.is-active::after {
    background: #9f2f28;
    content: "";
    display: block;
    height: 2px;
    margin: 7px auto 0;
    width: 28px;
}

.body-preface .nav-main {
    justify-content: center;
}

.body-preface .nav-main .nav-item {
    align-items: center;
    display: flex;
}

.body-preface .nav-main .nav-item + .nav-item::before {
    color: #8a7d68;
    content: "|";
    font-family: SimSun, serif;
    margin: 0 12px 0 8px;
}

.body-preface .nav-utility {
    justify-content: flex-end;
    min-width: 90px;
}

.body-preface .site-gear-link {
    font-family: "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif !important;
    font-size: 1.15rem !important;
}

.body-preface .site-gear-link::after {
    content: " 后台";
    font-size: 0.82rem;
    margin-left: 5px;
    vertical-align: 2px;
}

.preface-page {
    --preface-ink: #241b14;
    --preface-muted: #74634f;
    --preface-light-muted: #958675;
    --preface-red: #a2322b;
    --preface-red-deep: #7c221e;
    --preface-jade: #2f5a50;
    --preface-jade-deep: #24493f;
    --preface-line: #cbb58f;
    --preface-soft-line: rgba(203, 181, 143, 0.58);
    --preface-paper: #fbf3e5;
    --preface-paper-deep: #efe0c6;
    --preface-gold: #b48a46;
    background-color: #f4ead7;
    background-image:
        linear-gradient(180deg, rgba(251, 246, 236, 0.88), rgba(244, 233, 214, 0.94)),
        url("/media/home-source-motif.png");
    background-position: center top;
    background-repeat: repeat-y;
    background-size: 1920px auto;
    color: var(--preface-ink);
    font-family: "Noto Serif SC", "Songti SC", SimSun, serif;
    min-height: 100vh;
    overflow: hidden;
}

.preface-inner {
    margin: 0 auto;
    width: min(1480px, calc(100vw - 112px));
}

.preface-hero {
    background: #f3e7d2;
    border-bottom: 1px solid rgba(187, 160, 119, 0.72);
    isolation: isolate;
    min-height: 620px;
    overflow: hidden;
    position: relative;
}

.preface-hero::before {
    background-image: url("/media/hero-book-left-opening-approved-20260701.png");
    background-position: center center;
    background-repeat: no-repeat;
    background-size: 100% 100%;
    content: "";
    inset: 0;
    opacity: 0.94;
    pointer-events: none;
    position: absolute;
    z-index: 0;
}

.preface-hero::after {
    background:
        linear-gradient(90deg, rgba(247, 238, 221, 0.08) 0%, rgba(247, 238, 221, 0.05) 36%, rgba(247, 238, 221, 0.02) 64%, rgba(247, 238, 221, 0) 100%),
        linear-gradient(180deg, rgba(255, 251, 242, 0.02), rgba(232, 211, 178, 0.04));
    content: "";
    inset: 0;
    pointer-events: none;
    position: absolute;
    z-index: 0;
}

.preface-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 760px) minmax(440px, 1fr);
    min-height: 505px;
    position: relative;
    z-index: 1;
}

.preface-hero-copy {
    align-self: center;
    min-width: 0;
    padding: 42px 0 34px 52px;
    text-shadow: 0 1px 0 rgba(255, 250, 239, 0.84);
}

.preface-title-row {
    align-items: center;
    color: var(--preface-jade);
    display: flex;
    font-family: "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
    font-size: 0.95rem;
    font-weight: 700;
    gap: 12px;
    margin-bottom: 16px;
}

.preface-mark {
    align-items: center;
    background: rgba(255, 250, 240, 0.3);
    border: 1px solid var(--preface-red);
    color: var(--preface-red);
    display: inline-flex;
    font-family: KaiTi, STKaiti, "Songti SC", SimSun, serif;
    font-size: 1.35rem;
    height: 40px;
    justify-content: center;
    line-height: 1;
    width: 40px;
}

.preface-eyebrow,
.preface-kicker,
.preface-section-head span,
.preface-enter span {
    color: var(--preface-red);
    display: block;
    font-family: "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
    font-size: 0.84rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.preface-hero h1 {
    color: var(--preface-ink);
    font-family: STKaiti, KaiTi, "Songti SC", SimSun, serif;
    font-size: 3.78rem;
    font-weight: 500;
    line-height: 1.18;
    margin: 0 0 12px;
    max-width: none;
    white-space: nowrap;
}

.preface-subtitle {
    color: var(--preface-red);
    font-family: STKaiti, KaiTi, "Songti SC", SimSun, serif;
    font-size: 1.22rem;
    line-height: 1.62;
    margin: 0 0 15px;
}

.preface-lead {
    color: var(--preface-muted);
    font-size: 1rem;
    line-height: 1.88;
    margin: 0;
    max-width: 43em;
}

.preface-hero-actions,
.preface-enter-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.preface-hero-actions {
    margin-top: 24px;
}

.preface-action {
    align-items: center;
    background: rgba(255, 248, 235, 0.44);
    border: 1px solid var(--preface-line);
    color: var(--preface-ink);
    display: inline-flex;
    font-family: "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
    font-size: 0.94rem;
    font-weight: 700;
    min-height: 42px;
    padding: 0 20px;
    text-decoration: none;
}

.preface-action:hover {
    background: #efe0c4;
    color: var(--preface-red-deep);
}

.preface-action.primary {
    background: var(--preface-ink);
    border-color: var(--preface-ink);
    color: #fff8e8;
}

.preface-action.primary:hover {
    background: #3b3024;
    color: #fff8e8;
}

.preface-hero-side {
    align-self: stretch;
    min-height: 505px;
    position: relative;
    z-index: 2;
}

.preface-hero-side img {
    bottom: 30px;
    filter: drop-shadow(0 24px 34px rgba(66, 45, 23, 0.24));
    mix-blend-mode: multiply;
    object-fit: contain;
    opacity: 0.98;
    position: absolute;
    right: clamp(78px, 7.8vw, 152px);
    width: min(320px, 22vw);
}

.preface-seal-rail {
    color: var(--preface-red);
    font-family: KaiTi, STKaiti, "Songti SC", SimSun, serif;
    position: absolute;
    right: min(42vw, 590px);
    text-align: center;
    top: 76px;
    writing-mode: vertical-rl;
    z-index: 2;
}

.preface-seal-rail span {
    background: rgba(255, 249, 236, 0.46);
    border: 1px solid rgba(159, 47, 40, 0.72);
    display: inline-block;
    font-size: 1rem;
    line-height: 1.65;
    margin-bottom: 14px;
    padding: 12px 7px;
}

.preface-seal-rail strong {
    background: rgba(255, 249, 236, 0.32);
    border-left: 1px solid rgba(159, 47, 40, 0.28);
    border-right: 1px solid rgba(159, 47, 40, 0.28);
    font-size: 0.9rem;
    font-weight: 500;
    line-height: 1.8;
    padding: 10px 3px;
}

.preface-hero-poem {
    align-items: center;
    background: rgba(255, 249, 236, 0.52);
    backdrop-filter: blur(1.5px);
    border-bottom: 1px solid rgba(203, 181, 143, 0.52);
    border-top: 1px solid rgba(203, 181, 143, 0.7);
    color: #24483f;
    display: grid;
    font-family: KaiTi, STKaiti, "Songti SC", SimSun, serif;
    font-size: 1.13rem;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    min-height: 88px;
    position: relative;
    text-align: center;
    text-shadow: 0 1px 0 rgba(255, 251, 242, 0.9);
    z-index: 1;
}

.preface-hero-poem span {
    border-left: 1px solid rgba(203, 181, 143, 0.45);
    display: block;
    line-height: 1.7;
    padding: 0 20px;
}

.preface-hero-poem span:first-child {
    border-left: 0;
}

.preface-scroll-map {
    background:
        linear-gradient(180deg, rgba(252, 247, 237, 0.94), rgba(246, 235, 216, 0.94)),
        url("/media/home-source-motif.png");
    background-position: center 25%;
    background-repeat: no-repeat;
    background-size: cover;
    border-bottom: 1px solid var(--preface-soft-line);
    position: relative;
}

.preface-scroll-inner {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    min-height: 178px;
    position: relative;
}

.preface-scroll-inner::before {
    background: rgba(171, 144, 101, 0.5);
    content: "";
    height: 1px;
    left: 4%;
    position: absolute;
    right: 4%;
    top: 57px;
}

.preface-scroll-map a {
    align-content: start;
    color: var(--preface-ink);
    display: grid;
    gap: 6px;
    grid-template-rows: 62px auto auto auto;
    min-height: 166px;
    padding: 21px 22px 17px;
    position: relative;
    text-align: center;
    text-decoration: none;
}

.preface-scroll-map a + a {
    border-left: 1px solid rgba(203, 181, 143, 0.48);
}

.preface-scroll-map a:hover {
    background: rgba(255, 249, 236, 0.5);
    color: var(--preface-red-deep);
}

.preface-scroll-map img {
    align-self: center;
    filter: saturate(0.92) contrast(1.02);
    height: 56px;
    justify-self: center;
    mix-blend-mode: multiply;
    object-fit: contain;
    width: 66px;
}

.preface-scroll-map span {
    color: var(--preface-gold);
    display: block;
    font-family: KaiTi, STKaiti, "Songti SC", SimSun, serif;
    font-size: 1.05rem;
    line-height: 1;
}

.preface-scroll-map strong {
    display: block;
    font-family: STKaiti, KaiTi, "Songti SC", SimSun, serif;
    font-size: 1.18rem;
    font-weight: 700;
    line-height: 1.28;
}

.preface-scroll-map em {
    color: var(--preface-muted);
    display: block;
    font-size: 0.85rem;
    font-style: normal;
    line-height: 1.55;
}

.preface-scroll-map b {
    color: var(--preface-red);
    display: block;
    font-family: "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
    font-size: 0.78rem;
    font-weight: 800;
    line-height: 1;
    margin-top: 3px;
}

.preface-ident,
.preface-source,
.preface-zuxun,
.preface-xuba {
    background: rgba(248, 239, 224, 0.92);
    border-bottom: 1px solid var(--preface-soft-line);
}

.preface-ident-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1.35fr;
}

.preface-ident p {
    color: var(--preface-jade);
    font-family: STKaiti, KaiTi, "Songti SC", SimSun, serif;
    font-size: 1.2rem;
    margin: 0;
    padding: 22px 32px;
    text-align: center;
}

.preface-ident p + p {
    border-left: 1px solid var(--preface-soft-line);
}

.preface-ident span {
    color: var(--preface-muted);
    display: block;
    font-family: "Noto Serif SC", "Songti SC", SimSun, serif;
    font-size: 0.9rem;
    line-height: 1.7;
    margin-top: 6px;
}

.preface-opening,
.preface-zipai,
.preface-enter {
    background-image:
        linear-gradient(180deg, rgba(252, 247, 237, 0.86), rgba(250, 242, 229, 0.92)),
        url("/media/home-source-motif.png");
    background-position: center center;
    background-repeat: no-repeat;
    background-size: cover;
    border-bottom: 1px solid var(--preface-soft-line);
}

.preface-opening,
.preface-source,
.preface-zipai,
.preface-zuxun,
.preface-xuba {
    padding: 62px 0 68px;
    scroll-margin-top: 84px;
}

.preface-opening-grid {
    display: grid;
    gap: 36px;
    grid-template-columns: 76px minmax(0, 1fr) 320px;
}

.preface-vertical-title {
    align-self: start;
    border-left: 1px solid var(--preface-line);
    border-right: 1px solid var(--preface-line);
    color: var(--preface-red);
    font-family: KaiTi, STKaiti, "Songti SC", SimSun, serif;
    font-size: 1.2rem;
    justify-self: center;
    line-height: 1.75;
    padding: 16px 8px;
    writing-mode: vertical-rl;
}

.preface-paper {
    background:
        linear-gradient(90deg, rgba(255, 250, 239, 0.72), rgba(255, 247, 231, 0.55));
    border-bottom: 1px solid var(--preface-line);
    border-top: 1px solid var(--preface-line);
    box-shadow: 0 18px 34px rgba(80, 53, 24, 0.07);
}

.preface-paper-large {
    padding: 40px 48px;
}

.preface-paper h2,
.preface-section-head h2,
.preface-enter h2,
.preface-zipai-grid h2 {
    color: var(--preface-ink);
    font-family: KaiTi, STKaiti, "Songti SC", SimSun, serif;
    font-size: 2.08rem;
    line-height: 1.28;
    margin: 0 0 16px;
}

.preface-paper p,
.preface-section-head p,
.preface-source-river p,
.preface-enter p,
.preface-side-note p,
.preface-xuba-list,
.preface-note,
.preface-zipai-grid p {
    color: var(--preface-muted);
    font-size: 0.98rem;
    line-height: 1.92;
    margin: 0;
}

.preface-paper p {
    text-indent: 2em;
}

.preface-paper p + p {
    margin-top: 14px;
}

.preface-side-note {
    align-self: stretch;
    border-left: 1px solid var(--preface-soft-line);
    padding: 36px 0 34px 36px;
}

.preface-side-note span {
    color: var(--preface-red);
    display: block;
    font-size: 0.86rem;
    font-weight: 800;
    margin-bottom: 14px;
}

.preface-side-note strong {
    color: var(--preface-jade);
    display: block;
    font-family: KaiTi, STKaiti, "Songti SC", SimSun, serif;
    font-size: 1.46rem;
    line-height: 1.5;
    margin-bottom: 18px;
}

.preface-section-head {
    margin: 0 auto 36px;
    max-width: 840px;
    position: relative;
    text-align: center;
}

.preface-section-head::before,
.preface-section-head::after {
    background: var(--preface-line);
    content: "";
    display: inline-block;
    height: 1px;
    margin: 0 22px 10px;
    width: 120px;
}

.preface-section-head::after {
    background: var(--preface-red);
    height: 2px;
    margin: 13px auto 0;
    width: 34px;
}

.preface-section-head-left {
    margin: 0;
    max-width: none;
    text-align: left;
}

.preface-section-head-left::before {
    display: none;
}

.preface-section-head-left::after {
    display: block;
    margin-left: 0;
}

.preface-source-river {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    position: relative;
}

.preface-source-river::before {
    background: rgba(203, 181, 143, 0.72);
    content: "";
    height: 1px;
    left: 0;
    position: absolute;
    right: 0;
    top: 93px;
}

.preface-source-river article {
    min-height: 254px;
    padding: 22px 30px 20px;
    position: relative;
    text-align: center;
}

.preface-source-river article + article {
    border-left: 1px solid rgba(203, 181, 143, 0.45);
}

.preface-source-river img {
    display: block;
    filter: saturate(0.84) contrast(1.02);
    height: 64px;
    margin: 0 auto 15px;
    mix-blend-mode: multiply;
    object-fit: contain;
    width: 78px;
}

.preface-source-river span {
    color: var(--preface-gold);
    display: block;
    font-family: KaiTi, STKaiti, "Songti SC", SimSun, serif;
    font-size: 1.18rem;
    margin-bottom: 8px;
}

.preface-source-river h3 {
    color: var(--preface-red-deep);
    font-family: KaiTi, STKaiti, "Songti SC", SimSun, serif;
    font-size: 1.43rem;
    margin: 0 0 10px;
}

.preface-pull {
    border-bottom: 1px solid var(--preface-line);
    border-top: 1px solid var(--preface-line);
    color: var(--preface-jade);
    font-family: KaiTi, STKaiti, "Songti SC", SimSun, serif;
    font-size: 1.2rem;
    line-height: 1.85;
    margin: 34px auto 0;
    max-width: 880px;
    padding: 16px 22px;
    text-align: center;
}

.preface-zipai-grid,
.preface-xuba-grid,
.preface-enter-grid {
    align-items: center;
    display: grid;
    gap: 56px;
    grid-template-columns: minmax(320px, 0.62fr) minmax(0, 1fr);
}

.preface-zipai-scroll {
    background:
        linear-gradient(90deg, rgba(255, 251, 241, 0.78), rgba(247, 235, 213, 0.62));
    border-bottom: 1px solid var(--preface-line);
    border-top: 1px solid var(--preface-line);
    box-shadow: 0 18px 32px rgba(80, 53, 24, 0.06);
    padding: 18px 26px;
}

.preface-zipai-row {
    align-items: center;
    display: grid;
    gap: 8px;
    grid-template-columns: 42px repeat(5, minmax(36px, 1fr));
    min-height: 58px;
}

.preface-zipai-row + .preface-zipai-row {
    border-top: 1px solid rgba(203, 181, 143, 0.42);
}

.preface-zipai-row span {
    color: var(--preface-gold);
    font-family: KaiTi, STKaiti, "Songti SC", SimSun, serif;
    font-size: 1.05rem;
    text-align: center;
}

.preface-zipai-row b {
    color: var(--preface-ink);
    display: block;
    font-family: KaiTi, STKaiti, "Songti SC", SimSun, serif;
    font-size: 1.56rem;
    font-weight: 700;
    line-height: 1;
    text-align: center;
}

.preface-zipai-row b.is-head {
    color: var(--preface-red);
}

.preface-zuxun-grid {
    background: rgba(255, 249, 236, 0.55);
    border-bottom: 1px solid var(--preface-line);
    border-top: 1px solid var(--preface-line);
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
}

.preface-zuxun-grid span {
    align-items: center;
    border-bottom: 1px solid var(--preface-soft-line);
    border-left: 1px solid var(--preface-soft-line);
    color: var(--preface-ink);
    display: flex;
    font-family: KaiTi, STKaiti, "Songti SC", SimSun, serif;
    font-size: 1.16rem;
    gap: 9px;
    justify-content: center;
    line-height: 1.3;
    min-height: 68px;
    padding: 18px 8px;
    text-align: center;
}

.preface-zuxun-grid span:nth-child(6n + 1) {
    border-left: 0;
}

.preface-zuxun-grid span:nth-last-child(-n + 6) {
    border-bottom: 0;
}

.preface-zuxun-grid b {
    color: var(--preface-gold);
    font-family: "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
    font-size: 0.72rem;
    font-weight: 700;
}

.preface-zuxun-excerpt {
    display: grid;
    gap: 22px;
    grid-template-columns: repeat(2, 1fr);
    margin-top: 26px;
}

.preface-zuxun-excerpt article {
    background: rgba(255, 249, 236, 0.58);
    border-bottom: 1px solid var(--preface-line);
    border-top: 1px solid var(--preface-line);
    padding: 23px 28px;
}

.preface-zuxun-excerpt strong {
    color: var(--preface-red-deep);
    display: block;
    font-family: KaiTi, STKaiti, "Songti SC", SimSun, serif;
    font-size: 1.25rem;
    margin-bottom: 10px;
}

.preface-zuxun-excerpt p {
    color: var(--preface-muted);
    font-size: 0.96rem;
    line-height: 1.86;
    margin: 0;
}


.preface-xuba-list {
    border-bottom: 1px solid var(--preface-line);
    border-top: 1px solid var(--preface-line);
    color: var(--preface-jade);
    font-family: KaiTi, STKaiti, "Songti SC", SimSun, serif;
    font-size: 1.18rem;
    line-height: 2.26;
    padding: 24px 0;
}

.preface-enter {
    background-image:
        linear-gradient(180deg, rgba(252, 247, 237, 0.78), rgba(250, 242, 229, 0.86)),
        url("/media/home-source-motif.png");
    background-position: center bottom;
    background-repeat: no-repeat;
    background-size: cover;
    isolation: isolate;
    overflow: hidden;
    padding: 48px 0 84px;
    position: relative;
}

.preface-enter::before {
    background-image: url("/media/home-vine-band.png");
    background-position: center bottom;
    background-repeat: no-repeat;
    background-size: 100% 100%;
    content: "";
    inset: 0;
    mix-blend-mode: multiply;
    opacity: 0.88;
    pointer-events: none;
    position: absolute;
    z-index: 0;
}

.preface-enter > .preface-inner {
    position: relative;
    z-index: 1;
}

.preface-enter-grid {
    border-bottom: 1px solid var(--preface-line);
    border-top: 1px solid var(--preface-line);
    grid-template-columns: minmax(0, 1fr) auto;
    padding: 30px 0;
}

.preface-enter-actions {
    justify-content: flex-end;
}

@media (max-width: 1320px) {
    .body-preface .navbar .container-fluid {
        padding-left: 20px !important;
        padding-right: 20px !important;
    }

    .body-preface .nav-main .nav-item + .nav-item::before {
        margin: 0 7px 0 4px;
    }

    .preface-inner {
        width: min(1120px, calc(100vw - 48px));
    }

    .preface-hero-grid {
        grid-template-columns: minmax(0, 560px) minmax(340px, 1fr);
    }

    .preface-hero-copy {
        padding-left: 18px;
    }

    .preface-hero h1 {
        font-size: 3.24rem;
    }

    .preface-hero-side img {
        right: clamp(22px, 4vw, 70px);
        width: min(280px, 25vw);
    }

    .preface-scroll-inner {
        grid-template-columns: repeat(3, 1fr);
    }

    .preface-scroll-inner::before {
        display: none;
    }

    .preface-scroll-map a:nth-child(4) {
        border-left: 0;
    }

    .preface-opening-grid,
    .preface-zipai-grid,
    .preface-xuba-grid {
        grid-template-columns: 1fr;
    }

    .preface-vertical-title {
        display: none;
    }

    .preface-source-river {
        grid-template-columns: repeat(2, 1fr);
    }

    .preface-source-river::before {
        display: none;
    }

    .preface-source-river article:nth-child(3) {
        border-left: 0;
    }
}

@media (max-width: 760px) {
    .body-preface .navbar .container-fluid {
        padding-left: 14px !important;
        padding-right: 14px !important;
    }

    .body-preface .site-gear-link::after {
        content: "";
    }

    .body-preface .nav-main .nav-item + .nav-item::before {
        display: none;
    }

    .preface-inner {
        width: min(calc(100% - 28px), 640px);
    }

    .preface-hero {
        min-height: auto;
    }

    .preface-hero-grid {
        display: block;
        min-height: auto;
    }

    .preface-hero-copy {
        padding: 42px 0 30px;
    }

    .preface-hero h1 {
        font-size: 2.82rem;
        white-space: normal;
    }

    .preface-subtitle {
        font-size: 1.12rem;
    }

    .preface-hero-side {
        display: none;
    }

    .preface-hero-poem,
    .preface-scroll-inner,
    .preface-ident-grid,
    .preface-source-river,
    .preface-zipai-grid,
    .preface-xuba-grid,
    .preface-enter-grid {
        grid-template-columns: 1fr;
    }

    .preface-hero-poem {
        padding: 14px 0;
    }

    .preface-hero-poem span,
    .preface-scroll-map a,
    .preface-scroll-map a + a,
    .preface-ident p,
    .preface-ident p + p,
    .preface-source-river article,
    .preface-source-river article + article,
    .preface-source-river article:nth-child(3) {
        border-left: 0;
    }

    .preface-hero-poem span + span,
    .preface-scroll-map a + a,
    .preface-ident p + p,
    .preface-source-river article + article {
        border-top: 1px solid var(--preface-soft-line);
    }

    .preface-opening,
    .preface-source,
    .preface-zipai,
    .preface-zuxun,
    .preface-xuba,
    .preface-enter {
        padding: 40px 0 46px;
    }

    .preface-paper-large {
        padding: 28px 22px;
    }

    .preface-side-note {
        border-left: 0;
        border-top: 1px solid var(--preface-soft-line);
        padding: 24px 0 0;
    }

    .preface-section-head::before {
        width: 58px;
    }

    .preface-zipai-scroll {
        padding: 14px 10px;
    }

    .preface-zipai-row {
        gap: 5px;
        grid-template-columns: 28px repeat(7, minmax(24px, 1fr));
    }

    .preface-zipai-row b {
        font-size: 1.22rem;
    }

    .preface-zuxun-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .preface-zuxun-grid span:nth-child(6n + 1) {
        border-left: 1px solid var(--preface-soft-line);
    }

    .preface-zuxun-grid span:nth-child(3n + 1) {
        border-left: 0;
    }

    .preface-zuxun-grid span:nth-last-child(-n + 6) {
        border-bottom: 1px solid var(--preface-soft-line);
    }

    .preface-zuxun-excerpt {
        grid-template-columns: 1fr;
    }

    .preface-enter-actions {
        justify-content: flex-start;
    }
}