/* =========================================================
   禁漫天堂 JMComic 下载页
   纯静态样式，无外部字体、无框架依赖
   ========================================================= */

:root {
    --ink: #11151b;
    --ink-2: #1a2027;
    --paper: #eef1f5;
    --paper-deep: #e2e8ef;
    --cream: #ffffff;
    --orange: #ff5a36;
    --orange-dark: #b9381d;
    --acid: #d9f36a;
    --muted: #5c6570;
    --muted-light: #9aa4af;
    --line: rgba(17, 21, 27, 0.16);
    --line-light: rgba(255, 255, 255, 0.17);
    --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
    --font-display: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Arial Black", sans-serif;
    --font-mono: "SFMono-Regular", "Cascadia Mono", Consolas, "Liberation Mono", monospace;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 94px;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    color: var(--ink);
    background-color: var(--paper);
    background-image: radial-gradient(rgba(17, 21, 27, 0.06) 0.7px, transparent 0.7px);
    background-size: 9px 9px;
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.65;
    overflow-x: hidden;
}

body.modal-open {
    overflow: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
}

button {
    color: inherit;
    font: inherit;
}

h1,
h2,
h3,
p,
dl,
dd,
figure {
    margin: 0;
}

ul,
ol {
    margin: 0;
    padding: 0;
    list-style: none;
}

::selection {
    background: var(--orange);
    color: var(--ink);
}

:focus-visible {
    outline: 3px solid var(--cream);
    outline-offset: 2px;
    box-shadow: 0 0 0 5px var(--ink);
}

.svg-sprite {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

.icon {
    display: inline-block;
    width: 1.2em;
    height: 1.2em;
    flex: 0 0 auto;
    vertical-align: -0.15em;
}

.skip-link {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 9999;
    padding: 10px 16px;
    border: 1.5px solid var(--ink);
    border-radius: 8px;
    background: var(--orange);
    color: var(--ink);
    font-weight: 800;
    transform: translateY(-160%);
    transition: transform 0.2s ease;
}

.skip-link:focus {
    transform: translateY(0);
}

#main:focus {
    outline: none;
}

.container {
    width: min(1160px, calc(100% - 56px));
    margin: 0 auto;
}

/* ========== 按钮 ========== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-height: 50px;
    padding: 0 22px;
    border: 1.5px solid var(--ink);
    border-radius: 9px;
    background: var(--orange);
    color: var(--ink);
    box-shadow: 4px 4px 0 var(--ink);
    font-size: 0.94rem;
    font-weight: 800;
    line-height: 1.1;
    text-align: center;
    cursor: pointer;
    transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.btn:hover {
    background: #ff7252;
    box-shadow: 6px 6px 0 var(--ink);
    transform: translate(-1px, -1px);
}

.btn:active {
    box-shadow: 2px 2px 0 var(--ink);
    transform: translate(2px, 2px);
}

.btn .icon {
    width: 18px;
    height: 18px;
}

.btn--small {
    min-height: 40px;
    padding: 0 15px;
    border-radius: 8px;
    box-shadow: 3px 3px 0 var(--ink);
    font-size: 0.8rem;
}

.btn--hero {
    min-height: 58px;
    padding: 0 27px;
    font-size: 1rem;
    box-shadow: 5px 5px 0 var(--cream);
}

.btn--hero:hover {
    box-shadow: 7px 7px 0 var(--cream);
}

.btn--ghost {
    border-color: rgba(255, 255, 255, 0.5);
    background: transparent;
    color: var(--cream);
    box-shadow: none;
}

.btn--ghost:hover {
    border-color: var(--cream);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: none;
    transform: none;
}

.btn--outline {
    background: transparent;
    box-shadow: 4px 4px 0 var(--ink);
}

.btn--light {
    background: var(--cream);
    color: var(--ink);
    box-shadow: 4px 4px 0 var(--orange);
}

.btn--light:hover {
    background: #f4f7fa;
    box-shadow: 6px 6px 0 var(--orange);
}

.btn--ghost-light {
    border-color: rgba(255, 255, 255, 0.42);
    background: transparent;
    color: var(--cream);
    box-shadow: none;
}

.btn--ghost-light:hover {
    border-color: var(--cream);
    background: rgba(255, 255, 255, 0.07);
    box-shadow: none;
    transform: none;
}

/* ========== 顶部导航 ========== */

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--line);
    background: rgba(238, 241, 245, 0.94);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    transition: box-shadow 0.25s ease;
}

.site-header.is-scrolled {
    box-shadow: 0 10px 30px rgba(17, 21, 27, 0.09);
}

.header-inner {
    display: flex;
    position: relative;
    align-items: center;
    justify-content: space-between;
    width: min(1264px, calc(100% - 48px));
    min-height: 76px;
    margin: 0 auto;
    gap: 24px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    flex: 0 0 auto;
}

.brand img {
    width: 44px;
    height: 44px;
    border: 1.5px solid var(--ink);
    border-radius: 10px;
    object-fit: cover;
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1;
}

.brand-text strong {
    font-family: var(--font-display);
    font-size: 1.06rem;
    font-weight: 900;
    letter-spacing: -0.02em;
}

.brand-text small {
    margin-top: 6px;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.55rem;
    font-weight: 700;
    letter-spacing: 0.11em;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 27px;
}

.main-nav a {
    position: relative;
    padding: 5px 0;
    color: #434c56;
    font-size: 0.88rem;
    font-weight: 700;
}

.main-nav a::after {
    content: "";
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    height: 2px;
    background: var(--orange);
    transform: scaleX(0);
    transform-origin: right center;
    transition: transform 0.2s ease;
}

.main-nav a:hover {
    color: var(--ink);
}

.main-nav a:hover::after {
    transform: scaleX(1);
    transform-origin: left center;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 0 0 auto;
}

.nav-toggle {
    display: none;
    place-items: center;
    width: 42px;
    height: 42px;
    padding: 0;
    border: 1.5px solid var(--ink);
    border-radius: 8px;
    background: transparent;
    cursor: pointer;
}

.nav-toggle .icon {
    width: 22px;
    height: 22px;
}

.nav-toggle .icon--close {
    display: none;
}

body.nav-open .nav-toggle .icon--menu {
    display: none;
}

body.nav-open .nav-toggle .icon--close {
    display: block;
}

/* ========== 首屏 ========== */

.hero {
    position: relative;
    isolation: isolate;
    overflow: hidden;
    background: var(--ink);
    color: var(--cream);
}

.hero::before {
    content: "";
    position: absolute;
    z-index: 0;
    inset: 0;
    background-image: radial-gradient(rgba(255, 255, 255, 0.14) 0.8px, transparent 0.8px);
    background-size: 12px 12px;
    opacity: 0.5;
    -webkit-mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.55) 62%, transparent 100%);
    mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.55) 62%, transparent 100%);
    pointer-events: none;
}

.hero::after {
    content: "";
    position: absolute;
    z-index: 0;
    top: -38%;
    left: 50%;
    width: min(920px, 86vw);
    aspect-ratio: 1;
    border-radius: 50%;
    background: repeating-conic-gradient(from 4deg at 50% 50%,
            rgba(255, 90, 54, 0.11) 0deg 1.1deg,
            transparent 1.1deg 8deg);
    transform: translateX(-50%);
    pointer-events: none;
}

.hero-inner {
    display: grid;
    position: relative;
    z-index: 1;
    grid-template-columns: minmax(160px, 238px) minmax(0, 680px) minmax(160px, 238px);
    align-items: center;
    justify-content: center;
    width: min(1320px, calc(100% - 44px));
    min-height: clamp(610px, calc(100svh - 122px), 780px);
    margin: 0 auto;
    padding: 52px 0 44px;
    gap: clamp(18px, 3.2vw, 48px);
}

.hero-copy {
    position: relative;
    z-index: 2;
    max-width: 690px;
}

.kicker {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--orange);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.kicker::before {
    content: "";
    width: 28px;
    height: 2px;
    background: var(--orange);
}

.hero h1 {
    margin: 20px 0 24px;
    font-family: var(--font-display);
    font-size: clamp(3.1rem, 5.1vw, 4.8rem);
    font-weight: 900;
    line-height: 0.98;
    letter-spacing: -0.055em;
}

.hero h1 span {
    display: inline-block;
    position: relative;
    isolation: isolate;
    color: var(--orange);
}

.hero h1 span::after {
    content: "";
    position: absolute;
    z-index: -1;
    right: 0.02em;
    bottom: 0.08em;
    left: 0.02em;
    height: 0.1em;
    background: rgba(255, 90, 54, 0.28);
    transform: rotate(-1deg);
}

.hero-lede {
    max-width: 620px;
    color: #c1cbd5;
    font-size: 1.01rem;
    line-height: 1.86;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
    margin-top: 29px;
}

.hero-facts {
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    gap: 0;
    margin-top: 30px;
    padding-top: 19px;
    border-top: 1px solid var(--line-light);
}

.hero-facts li {
    display: flex;
    flex-direction: column;
    gap: 2px;
    margin-right: 24px;
    padding-right: 24px;
    border-right: 1px solid var(--line-light);
}

.hero-facts li:last-child {
    margin-right: 0;
    padding-right: 0;
    border-right: 0;
}

.hero-facts strong {
    color: var(--cream);
    font-family: var(--font-mono);
    font-size: 0.95rem;
    font-weight: 700;
}

.hero-facts span {
    color: #8e99a5;
    font-size: 0.68rem;
    letter-spacing: 0.04em;
}

.hero-note {
    margin-top: 21px;
    color: #8e99a5;
    font-size: 0.72rem;
    line-height: 1.65;
}

.hero-note span {
    color: #d4dde6;
    font-family: var(--font-mono);
    font-size: 0.68rem;
}

.hero-page {
    position: relative;
    width: 100%;
    max-width: 238px;
    padding: 8px 8px 29px;
    border: 1.5px solid #05070a;
    border-radius: 3px;
    background: #fbfcfe;
    box-shadow: 9px 9px 0 var(--orange);
    transform: rotate(-3.2deg);
    transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.hero-page--left {
    justify-self: end;
    animation: page-left-in 0.85s 0.1s cubic-bezier(0.2, 0.7, 0.2, 1) backwards;
}

.hero-page--right {
    justify-self: start;
    box-shadow: -9px 9px 0 var(--orange);
    transform: rotate(3.2deg);
    animation: page-right-in 0.85s 0.2s cubic-bezier(0.2, 0.7, 0.2, 1) backwards;
}

.hero-page:hover {
    z-index: 3;
    box-shadow: 13px 13px 0 var(--orange);
    transform: translateY(-7px) rotate(0deg);
}

.hero-page--right:hover {
    box-shadow: -13px 13px 0 var(--orange);
}

.hero-page img {
    width: 100%;
    aspect-ratio: 810 / 1440;
    border: 1px solid rgba(17, 21, 27, 0.24);
    object-fit: cover;
    object-position: top center;
    filter: contrast(1.03);
}

.hero-page--left img {
    aspect-ratio: 938 / 1440;
}

.hero-page--right img {
    aspect-ratio: 810 / 1440;
}

.hero-page figcaption {
    display: flex;
    position: absolute;
    right: 11px;
    bottom: 8px;
    left: 11px;
    align-items: center;
    justify-content: space-between;
    color: #333a43;
    font-family: var(--font-mono);
    font-size: 0.52rem;
    font-weight: 700;
    letter-spacing: 0.13em;
}

.page-tape {
    position: absolute;
    z-index: 2;
    top: -11px;
    left: 50%;
    width: 74px;
    height: 23px;
    background: rgba(207, 217, 227, 0.9);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.16);
    transform: translateX(-50%) rotate(-1.5deg);
}

@keyframes page-left-in {
    from {
        opacity: 0;
        transform: translateY(24px) rotate(-7deg);
    }

    to {
        opacity: 1;
        transform: translateY(0) rotate(-3.2deg);
    }
}

@keyframes page-right-in {
    from {
        opacity: 0;
        transform: translateY(24px) rotate(7deg);
    }

    to {
        opacity: 1;
        transform: translateY(0) rotate(3.2deg);
    }
}

.hero-strip {
    display: flex;
    position: relative;
    z-index: 1;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 12px clamp(22px, 4vw, 56px);
    border-top: 1px solid var(--line-light);
    background: #0b0e12;
    color: #8e99a5;
    font-size: 0.73rem;
}

.hero-strip p {
    display: flex;
    align-items: center;
    gap: 9px;
}

.age-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 31px;
    height: 20px;
    padding: 0 6px;
    border-radius: 3px;
    background: var(--orange);
    color: var(--ink);
    font-family: var(--font-mono);
    font-size: 0.58rem;
    font-weight: 800;
    letter-spacing: 0.03em;
}

.hero-strip-node {
    flex: 0 0 auto;
    font-family: var(--font-mono);
    font-size: 0.65rem;
}

/* ========== 通用版块 ========== */

.section {
    padding: 96px 0;
}

.section-head {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(280px, 380px);
    align-items: end;
    gap: 56px;
    margin-bottom: 46px;
}

.eyebrow {
    display: flex;
    align-items: center;
    gap: 9px;
    margin-bottom: 13px;
    color: var(--orange-dark);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.16em;
}

.eyebrow::before {
    content: "";
    width: 18px;
    height: 1.5px;
    background: currentColor;
}

.section h2 {
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 4vw, 3.7rem);
    font-weight: 900;
    line-height: 1.04;
    letter-spacing: -0.052em;
}

.section-intro {
    max-width: 36em;
    color: var(--muted);
    font-size: 0.93rem;
    line-height: 1.82;
}

.section-side .section-intro {
    margin-bottom: 16px;
}

.text-link {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding-bottom: 3px;
    border-bottom: 1.5px solid var(--ink);
    font-size: 0.85rem;
    font-weight: 800;
    transition: color 0.18s ease, border-color 0.18s ease, gap 0.18s ease;
}

.text-link .icon {
    width: 16px;
    height: 16px;
}

.text-link:hover {
    gap: 11px;
    border-color: var(--orange-dark);
    color: var(--orange-dark);
}

/* ========== 下载 ========== */

.download-panel {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
    overflow: hidden;
    border: 1.5px solid var(--ink);
    border-radius: 16px;
    background: var(--cream);
    box-shadow: 9px 9px 0 var(--ink);
}

.download-main {
    padding: 38px;
    border-right: 1.5px solid var(--ink);
    background:
        radial-gradient(circle at 100% 0%, rgba(255, 90, 54, 0.16), transparent 36%),
        var(--cream);
}

.dl-title {
    display: flex;
    align-items: center;
    gap: 15px;
}

.dl-icon {
    display: grid;
    place-items: center;
    width: 58px;
    height: 58px;
    flex: 0 0 auto;
    border: 1.5px solid var(--ink);
    border-radius: 14px;
    background: var(--orange);
    box-shadow: 3px 3px 0 var(--ink);
}

.dl-icon .icon {
    width: 28px;
    height: 28px;
}

.dl-title h3 {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 900;
    line-height: 1.25;
    letter-spacing: -0.03em;
}

.dl-title p {
    margin-top: 3px;
    color: var(--muted);
    font-size: 0.78rem;
}

.dl-status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-left: auto;
    padding: 4px 9px;
    border: 1px solid rgba(17, 21, 27, 0.22);
    border-radius: 999px;
    background: var(--acid);
    color: #303b0b;
    font-size: 0.66rem;
    font-weight: 700;
    white-space: nowrap;
}

.dl-status i {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #566b13;
    box-shadow: 0 0 0 3px rgba(86, 107, 19, 0.13);
}

.btn--download {
    width: 100%;
    min-height: 60px;
    margin: 25px 0 14px;
    font-size: 1.06rem;
}

.btn--download .icon {
    width: 21px;
    height: 21px;
}

.btn-version {
    margin-left: 4px;
    padding: 3px 7px;
    border: 1px solid rgba(17, 21, 27, 0.35);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 700;
}

.url-row {
    display: flex;
    align-items: stretch;
    gap: 0;
    border: 1px dashed #9eabb8;
    border-radius: 7px;
    background: #eaf0f5;
    overflow: hidden;
}

.url-row code {
    display: flex;
    align-items: center;
    flex: 1 1 auto;
    min-width: 0;
    padding: 9px 11px;
    color: #4b5662;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    word-break: break-all;
}

.copy-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    flex: 0 0 auto;
    min-width: 80px;
    padding: 0 12px;
    border: 0;
    border-left: 1px dashed #9eabb8;
    background: transparent;
    color: #3e4955;
    font-size: 0.7rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.18s ease, color 0.18s ease;
}

.copy-btn .icon {
    width: 14px;
    height: 14px;
}

.copy-btn:hover {
    background: rgba(255, 90, 54, 0.12);
    color: var(--orange-dark);
}

.copy-btn:focus-visible {
    outline: 2px solid var(--ink);
    outline-offset: -4px;
    box-shadow: none;
}

.copy-btn.is-copied {
    background: var(--orange);
    color: var(--ink);
}

.dl-facts {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    margin-top: 24px;
}

.dl-facts div {
    padding-top: 10px;
    border-top: 1px solid #cbd4de;
}

.dl-facts dt {
    margin-bottom: 3px;
    color: var(--muted);
    font-size: 0.65rem;
    letter-spacing: 0.06em;
}

.dl-facts dd {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 700;
}

.download-side {
    padding: 34px 32px;
    background: #e3e9f0;
}

.side-label {
    color: var(--orange-dark);
    font-family: var(--font-mono);
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.16em;
}

.download-side h3 {
    margin: 7px 0 21px;
    font-family: var(--font-display);
    font-size: 1.18rem;
    font-weight: 900;
    letter-spacing: -0.025em;
}

.check-list {
    display: grid;
    gap: 17px;
}

.check-list li {
    display: grid;
    grid-template-columns: 30px minmax(0, 1fr);
    gap: 11px;
}

.check-list li > span {
    padding-top: 1px;
    color: var(--orange-dark);
    font-family: var(--font-mono);
    font-size: 0.66rem;
    font-weight: 700;
}

.check-list strong {
    display: block;
    margin-bottom: 3px;
    font-size: 0.86rem;
}

.check-list p {
    color: #56616d;
    font-size: 0.78rem;
    line-height: 1.7;
}

.side-note {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid #c3ccd6;
    color: #54606c;
    font-size: 0.72rem;
    line-height: 1.65;
}

.side-note .icon {
    width: 16px;
    height: 16px;
    margin-top: 2px;
    color: var(--orange-dark);
}

/* ========== 使用说明 ========== */

.section--features {
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    background: var(--paper-deep);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.feature-card {
    position: relative;
    overflow: hidden;
    padding: 27px 25px 29px;
    border: 1.5px solid var(--ink);
    border-radius: 14px;
    background: var(--cream);
    box-shadow: 5px 5px 0 var(--ink);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover {
    box-shadow: 8px 8px 0 var(--ink);
    transform: translate(-2px, -2px);
}

.feature-card--accent {
    background: var(--orange);
}

.feature-no {
    position: absolute;
    top: 22px;
    right: 23px;
    color: rgba(17, 21, 27, 0.42);
    font-family: var(--font-mono);
    font-size: 0.66rem;
    font-weight: 700;
    letter-spacing: 0.06em;
}

.feature-icon {
    display: grid;
    place-items: center;
    width: 47px;
    height: 47px;
    margin-bottom: 29px;
    border: 1.5px solid var(--ink);
    border-radius: 11px;
    background: var(--paper);
}

.feature-icon .icon {
    width: 23px;
    height: 23px;
}

.feature-card--accent .feature-icon {
    background: var(--ink);
    color: var(--cream);
}

.feature-card h3 {
    margin-bottom: 9px;
    font-family: var(--font-display);
    font-size: 1.06rem;
    font-weight: 900;
    line-height: 1.42;
    letter-spacing: -0.02em;
}

.feature-card p {
    color: var(--muted);
    font-size: 0.82rem;
    line-height: 1.78;
}

.feature-card--accent p {
    color: rgba(17, 21, 27, 0.76);
}

/* ========== 书架 ========== */

.section--shelf {
    border-top: 1px solid var(--line);
    background: #f7f9fb;
}

.book-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
}

.book-card {
    overflow: hidden;
    border: 1.5px solid var(--ink);
    border-radius: 13px;
    background: var(--cream);
    box-shadow: 5px 5px 0 var(--ink);
    transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.book-card:hover {
    box-shadow: 8px 8px 0 var(--ink);
    transform: translate(-2px, -2px);
}

.book-cover {
    position: relative;
    overflow: hidden;
    aspect-ratio: 3 / 4;
    border-bottom: 1.5px solid var(--ink);
    background: #dce3ea;
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    filter: grayscale(1) contrast(1.02);
    transition: transform 0.5s ease, filter 0.3s ease;
}

.book-card:hover .book-cover img {
    filter: grayscale(0.25) contrast(1.02);
    transform: scale(1.035);
}

.book-no {
    position: absolute;
    top: 10px;
    left: 10px;
    padding: 4px 7px;
    border-radius: 3px;
    background: var(--ink);
    color: var(--cream);
    font-family: var(--font-mono);
    font-size: 0.58rem;
    font-weight: 700;
    letter-spacing: 0.08em;
}

.book-info {
    padding: 18px 17px 20px;
}

.book-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

.book-tags span {
    padding: 2px 7px;
    border: 1px solid #b8c3ce;
    border-radius: 999px;
    color: var(--muted);
    font-size: 0.62rem;
    line-height: 1.55;
}

.book-info h3 {
    margin: 9px 0 7px;
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 900;
    letter-spacing: -0.02em;
}

.book-info p {
    color: var(--muted);
    font-size: 0.78rem;
    line-height: 1.68;
}

.shelf-note {
    margin-top: 24px;
    color: var(--muted);
    font-size: 0.72rem;
}

/* ========== 安装 ========== */

.section--install {
    position: relative;
    isolation: isolate;
    overflow: hidden;
    background: var(--ink);
    color: var(--cream);
}

.section--install::before {
    content: "";
    position: absolute;
    z-index: -1;
    top: -20%;
    right: -12%;
    width: 680px;
    height: 680px;
    border-radius: 50%;
    background: repeating-conic-gradient(from 0deg at 50% 50%,
            rgba(255, 90, 54, 0.08) 0deg 1deg,
            transparent 1deg 9deg);
}

.section--install .eyebrow {
    color: var(--orange);
}

.section--install h2 {
    margin-bottom: 19px;
}

.install-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.8fr);
    align-items: center;
    gap: 76px;
}

.install-content {
    min-width: 0;
}

.install-lede {
    max-width: 36em;
    margin-bottom: 27px;
    color: #a3aeb9;
    font-size: 0.92rem;
    line-height: 1.85;
}

.step-list {
    border-top: 1px solid var(--line-light);
}

.step {
    display: grid;
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 16px;
    padding: 23px 0;
    border-bottom: 1px solid var(--line-light);
}

.step-num {
    color: var(--orange);
    font-family: var(--font-mono);
    font-size: 1.08rem;
    font-weight: 700;
    line-height: 1.4;
}

.step h3 {
    margin-bottom: 6px;
    font-family: var(--font-display);
    font-size: 1.03rem;
    font-weight: 900;
    letter-spacing: -0.015em;
}

.step p {
    color: #a3aeb9;
    font-size: 0.82rem;
    line-height: 1.75;
}

.install-note {
    display: flex;
    align-items: flex-start;
    gap: 9px;
    margin-top: 24px;
    padding: 13px 15px;
    border-left: 2px solid var(--orange);
    background: rgba(255, 90, 54, 0.09);
    color: #cbd5df;
    font-size: 0.76rem;
    line-height: 1.7;
}

.install-note .icon {
    width: 16px;
    height: 16px;
    margin-top: 2px;
    color: var(--orange);
}

.phone-stage {
    display: flex;
    position: relative;
    align-items: center;
    justify-content: center;
    padding: 18px 20px 28px;
}

.phone-stage::before {
    content: "";
    position: absolute;
    width: min(360px, 78vw);
    height: min(555px, 118vw);
    border: 1.5px solid rgba(255, 90, 54, 0.34);
    border-radius: 42px;
    transform: rotate(-5deg);
}

.phone {
    position: relative;
    z-index: 1;
    width: min(306px, 72vw);
    padding: 9px;
    border: 1.5px solid var(--cream);
    border-radius: 38px;
    background: #090c10;
    box-shadow: 16px 16px 0 var(--orange);
    transform: rotate(2.5deg);
}

.phone-notch {
    position: absolute;
    z-index: 4;
    top: 17px;
    left: 50%;
    width: 88px;
    height: 21px;
    border-radius: 999px;
    background: #090c10;
    transform: translateX(-50%);
}

.phone-screen {
    position: relative;
    overflow: hidden;
    aspect-ratio: 9 / 17;
    border-radius: 29px;
    background: #242b33;
}

.phone-screen > img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    filter: grayscale(1) contrast(1.06) brightness(0.82);
}

.phone-topbar {
    display: flex;
    position: absolute;
    top: 50px;
    right: 13px;
    left: 13px;
    align-items: center;
    justify-content: space-between;
    padding: 7px 10px;
    border: 1px solid rgba(255, 250, 240, 0.22);
    border-radius: 7px;
    background: rgba(12, 10, 9, 0.52);
    color: var(--cream);
    font-size: 0.64rem;
    font-weight: 700;
    backdrop-filter: blur(5px);
}

.phone-topbar .icon {
    width: 14px;
    height: 14px;
}

.phone-bottombar {
    position: absolute;
    right: 10px;
    bottom: 12px;
    left: 10px;
    padding: 11px 12px;
    border: 1px solid rgba(255, 250, 240, 0.18);
    border-radius: 10px;
    background: rgba(12, 10, 9, 0.72);
    color: var(--cream);
    backdrop-filter: blur(5px);
}

.phone-cache {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 10px;
    font-size: 0.62rem;
}

.phone-cache strong {
    font-size: 0.67rem;
}

.phone-cache span {
    color: #b9c3cd;
    font-family: var(--font-mono);
    font-size: 0.54rem;
}

.phone-progress {
    overflow: hidden;
    height: 4px;
    margin-top: 8px;
    border-radius: 999px;
    background: rgba(255, 250, 240, 0.18);
}

.phone-progress i {
    display: block;
    width: 68%;
    height: 100%;
    border-radius: inherit;
    background: var(--orange);
}

.phone-sticker {
    position: absolute;
    z-index: 3;
    top: 11%;
    right: 1%;
    padding: 8px 11px;
    border: 1.5px solid var(--ink);
    background: var(--orange);
    color: var(--ink);
    box-shadow: 3px 3px 0 var(--cream);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 700;
    line-height: 1.15;
    text-align: center;
    transform: rotate(7deg);
}

.phone-sticker small {
    display: block;
    margin-top: 3px;
    font-size: 0.46rem;
    letter-spacing: 0.11em;
}

/* ========== 版本记录 ========== */

.log-list {
    border-top: 1.5px solid var(--ink);
}

.log-row {
    display: grid;
    grid-template-columns: 145px minmax(0, 1fr) 76px;
    align-items: start;
    gap: 30px;
    padding: 26px 0;
    border-bottom: 1px solid var(--line);
}

.log-ver {
    display: flex;
    align-items: center;
    gap: 8px;
    padding-top: 1px;
}

.log-ver strong {
    font-family: var(--font-mono);
    font-size: 1rem;
}

.tag-new {
    padding: 2px 6px;
    border-radius: 3px;
    background: var(--acid);
    color: #303b0b;
    font-size: 0.56rem;
    font-weight: 800;
    line-height: 1.5;
}

.log-main h3 {
    margin-bottom: 6px;
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 900;
    letter-spacing: -0.015em;
}

.log-main p {
    max-width: 58em;
    color: var(--muted);
    font-size: 0.83rem;
    line-height: 1.76;
}

.log-row time {
    padding-top: 3px;
    color: #6b7682;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-align: right;
}

.log-note {
    margin-top: 25px;
    color: var(--muted);
    font-size: 0.76rem;
    line-height: 1.75;
}

/* ========== 常见问题 ========== */

.section--faq {
    border-top: 1px solid var(--line);
    background: #e5ebf2;
}

.faq-layout {
    display: grid;
    grid-template-columns: minmax(260px, 0.72fr) minmax(0, 1.28fr);
    align-items: start;
    gap: 74px;
}

.faq-intro {
    position: sticky;
    top: 112px;
}

.faq-intro h2 {
    margin-bottom: 18px;
}

.faq-intro > p {
    max-width: 27em;
    margin-bottom: 24px;
    color: var(--muted);
    font-size: 0.86rem;
    line-height: 1.82;
}

.faq-list {
    border-top: 1.5px solid var(--ink);
}

.faq-item {
    border-bottom: 1px solid var(--line);
}

.faq-item summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 22px;
    padding: 21px 0;
    list-style: none;
    font-size: 0.95rem;
    font-weight: 800;
    line-height: 1.55;
    cursor: pointer;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: "";
    position: relative;
    width: 17px;
    height: 17px;
    flex: 0 0 auto;
    background:
        linear-gradient(var(--ink), var(--ink)) center / 17px 1.5px no-repeat,
        linear-gradient(var(--ink), var(--ink)) center / 1.5px 17px no-repeat;
    transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
    background: linear-gradient(var(--ink), var(--ink)) center / 17px 1.5px no-repeat;
    transform: none;
}

.faq-item summary:hover {
    color: var(--orange-dark);
}

.faq-answer {
    padding: 0 40px 23px 0;
}

.faq-answer p {
    color: var(--muted);
    font-size: 0.85rem;
    line-height: 1.86;
}

/* ========== 提醒条 ========== */

.notice-band {
    padding: 32px 0;
    border-top: 1.5px solid var(--ink);
    border-bottom: 1.5px solid var(--ink);
    background: var(--acid);
}

.notice-inner {
    display: grid;
    grid-template-columns: 260px minmax(0, 1fr);
    align-items: center;
    gap: 40px;
}

.notice-title-wrap {
    display: flex;
    align-items: center;
    gap: 14px;
}

.notice-age {
    display: grid;
    place-items: center;
    width: 61px;
    height: 61px;
    flex: 0 0 auto;
    border: 1.5px solid var(--ink);
    border-radius: 50%;
    background: var(--cream);
    font-family: var(--font-mono);
    font-size: 1.02rem;
    font-weight: 800;
    box-shadow: 3px 3px 0 var(--ink);
}

.notice-title-wrap h2 {
    font-family: var(--font-display);
    font-size: 1.24rem;
    font-weight: 900;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

.notice-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
}

.notice-list li {
    padding-left: 17px;
    border-left: 1px solid rgba(17, 21, 27, 0.36);
    font-size: 0.75rem;
    line-height: 1.75;
}

/* ========== 页脚 ========== */

.site-footer {
    padding: 68px 0 28px;
    background: var(--ink);
    color: #d7dee6;
}

.footer-support {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    padding: 28px 30px;
    border: 1px solid var(--line-light);
    border-radius: 14px;
    background: #171c23;
}

.footer-support .eyebrow {
    margin-bottom: 8px;
    color: var(--orange);
}

.footer-support h2 {
    margin-bottom: 6px;
    color: var(--cream);
    font-family: var(--font-display);
    font-size: clamp(1.35rem, 2.3vw, 1.8rem);
    font-weight: 900;
    letter-spacing: -0.03em;
}

.footer-support p:last-child {
    color: #9ea9b5;
    font-size: 0.78rem;
    line-height: 1.7;
}

.footer-support-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    flex: 0 0 auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: minmax(260px, 1.7fr) repeat(3, minmax(120px, 0.7fr));
    gap: 46px;
    padding: 49px 0 38px;
}

.brand--footer img {
    width: 46px;
    height: 46px;
    border-color: rgba(255, 255, 255, 0.4);
}

.brand--footer .brand-text strong {
    color: var(--cream);
}

.brand--footer .brand-text small {
    color: #8b96a2;
}

.footer-brand > p {
    max-width: 35em;
    margin-top: 18px;
    color: #9aa5b1;
    font-size: 0.78rem;
    line-height: 1.78;
}

.footer-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 17px;
}

.footer-badges span {
    padding: 3px 8px;
    border: 1px solid rgba(255, 255, 255, 0.22);
    border-radius: 4px;
    color: #a3aeb9;
    font-family: var(--font-mono);
    font-size: 0.56rem;
    letter-spacing: 0.04em;
}

.footer-col h3 {
    margin-bottom: 15px;
    color: var(--cream);
    font-family: var(--font-mono);
    font-size: 0.67rem;
    font-weight: 700;
    letter-spacing: 0.13em;
}

.footer-col ul {
    display: grid;
    gap: 9px;
}

.footer-col a,
.footer-link {
    padding: 0;
    border: 0;
    background: transparent;
    color: #9ea9b5;
    font-size: 0.78rem;
    line-height: 1.6;
    text-align: left;
    cursor: pointer;
    transition: color 0.18s ease;
}

.footer-col a:hover,
.footer-link:hover {
    color: var(--orange);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 22px;
    padding-top: 21px;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    color: #8b96a2;
    font-size: 0.68rem;
    line-height: 1.7;
}

.legal-links {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    flex: 0 0 auto;
}

.legal-links button {
    padding: 4px 0;
    border: 0;
    background: transparent;
    color: #96a1ad;
    font-family: var(--font-mono);
    font-size: 0.64rem;
    line-height: 1.8;
    cursor: pointer;
    transition: color 0.18s ease;
}

.legal-links button:hover {
    color: var(--orange);
}

.noscript-note {
    margin-top: 14px;
    color: #9ea9b5;
    font-size: 0.72rem;
}

/* ========== 弹窗 ========== */

.support-dialog {
    width: min(620px, calc(100vw - 32px));
    max-height: min(82vh, 760px);
    margin: auto;
    padding: 0;
    border: 1.5px solid var(--ink);
    border-radius: 16px;
    background: var(--cream);
    color: var(--ink);
    box-shadow: 12px 12px 0 var(--orange);
    overflow: hidden;
}

.support-dialog::backdrop {
    background: rgba(7, 11, 16, 0.76);
    backdrop-filter: blur(3px);
}

.support-dialog[open] {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 2000;
    margin: auto;
    animation: dialog-in 0.24s ease both;
}

@keyframes dialog-in {
    from {
        opacity: 0;
        transform: translateY(12px) scale(0.985);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.dialog-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 13px 20px;
    border-bottom: 1.5px solid var(--ink);
    background: var(--orange);
}

.dialog-eyebrow {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.14em;
}

.dialog-close {
    display: grid;
    place-items: center;
    width: 30px;
    height: 30px;
    padding: 0;
    border: 1.5px solid var(--ink);
    border-radius: 6px;
    background: var(--cream);
    cursor: pointer;
    transition: background 0.18s ease, transform 0.18s ease;
}

.dialog-close:hover {
    background: var(--ink);
    color: var(--cream);
    transform: rotate(3deg);
}

.dialog-close .icon {
    width: 16px;
    height: 16px;
}

.dialog-content {
    max-height: calc(min(82vh, 760px) - 58px);
    overflow-y: auto;
    padding: 25px 28px 29px;
    overscroll-behavior: contain;
}

.dialog-content h2 {
    margin-bottom: 15px;
    font-family: var(--font-display);
    font-size: 1.65rem;
    font-weight: 900;
    line-height: 1.25;
    letter-spacing: -0.035em;
}

.dialog-body {
    color: #3e4853;
    font-size: 0.86rem;
    line-height: 1.8;
}

.dialog-body p {
    margin-bottom: 12px;
}

.dialog-body p:last-child {
    margin-bottom: 0;
}

.dialog-body strong {
    color: var(--ink);
}

.dialog-body p a,
.dialog-body li a {
    color: var(--orange-dark);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.modal-lead {
    color: var(--ink);
    font-size: 0.9rem;
}

.modal-card {
    margin: 16px 0;
    padding: 15px 16px;
    border: 1.5px solid var(--ink);
    border-radius: 9px;
    background: #e8eef4;
    box-shadow: 3px 3px 0 var(--ink);
}

.modal-card > span {
    display: block;
    margin-bottom: 3px;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.1em;
}

.modal-card a {
    display: inline-block;
    color: var(--orange-dark);
    font-family: var(--font-mono);
    font-size: 0.98rem;
    font-weight: 700;
    word-break: break-all;
}

.modal-card small {
    display: block;
    margin-top: 6px;
    color: var(--muted);
    font-size: 0.7rem;
    line-height: 1.6;
}

.modal-list {
    display: grid;
    gap: 7px;
    margin: 14px 0;
    padding: 0;
    list-style: none;
}

.modal-list li {
    position: relative;
    padding-left: 16px;
    font-size: 0.82rem;
    line-height: 1.7;
}

.modal-list li::before {
    content: "";
    position: absolute;
    top: 0.7em;
    left: 2px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--orange);
}

.modal-steps {
    display: grid;
    gap: 12px;
    margin: 15px 0;
    padding: 0;
    list-style: none;
    counter-reset: modal-step;
}

.modal-steps li {
    display: grid;
    grid-template-columns: 28px minmax(0, 1fr);
    gap: 9px;
    font-size: 0.82rem;
    line-height: 1.7;
}

.modal-steps li::before {
    counter-increment: modal-step;
    content: "0" counter(modal-step);
    color: var(--orange-dark);
    font-family: var(--font-mono);
    font-size: 0.67rem;
    font-weight: 700;
    line-height: 1.9;
}

.modal-note {
    margin-top: 15px;
    padding: 11px 13px;
    border-left: 2px solid var(--orange);
    background: rgba(255, 90, 54, 0.08);
    color: #5b6672;
    font-size: 0.76rem;
    line-height: 1.7;
}

.modal-cert {
    margin: 14px 0 17px;
    padding: 18px;
    border: 1.5px solid var(--ink);
    background: #f1f5f9;
    box-shadow: 4px 4px 0 var(--ink);
}

.modal-cert > span {
    display: block;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid #c5cfda;
    font-family: var(--font-mono);
    font-size: 0.66rem;
    font-weight: 700;
    letter-spacing: 0.12em;
}

.modal-cert dl {
    display: grid;
    gap: 7px;
}

.modal-cert dl div {
    display: grid;
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 10px;
}

.modal-cert dt {
    color: var(--muted);
    font-size: 0.73rem;
}

.modal-cert dd {
    font-size: 0.78rem;
    font-weight: 600;
    word-break: break-all;
}

/* ========== 响应式 ========== */

@media (max-width: 1180px) {
    .hero-inner {
        grid-template-columns: minmax(145px, 205px) minmax(0, 660px) minmax(145px, 205px);
        gap: 24px;
    }

    .hero h1 {
        font-size: clamp(3rem, 5.2vw, 4.5rem);
    }

    .section-head {
        gap: 40px;
    }

    .install-grid {
        gap: 46px;
    }

    .faq-layout {
        gap: 50px;
    }
}

@media (max-width: 1020px) {
    .main-nav {
        gap: 20px;
    }

    .hero-inner {
        grid-template-columns: minmax(135px, 180px) minmax(0, 1fr) minmax(135px, 180px);
        gap: 18px;
    }

    .hero h1 {
        font-size: clamp(2.9rem, 5.4vw, 4.2rem);
    }

    .feature-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .footer-grid {
        grid-template-columns: minmax(240px, 1.5fr) repeat(3, minmax(100px, 0.7fr));
        gap: 30px;
    }
}

@media (max-width: 960px) {
    body.nav-open {
        overflow: hidden;
    }

    .header-inner {
        min-height: 70px;
    }

    .main-nav {
        display: none;
    }

    .nav-toggle {
        display: grid;
    }

    body.nav-open .main-nav {
        display: flex;
        position: absolute;
        top: calc(100% + 1px);
        right: -24px;
        left: -24px;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 9px 24px 18px;
        border-bottom: 1.5px solid var(--ink);
        background: var(--paper);
        box-shadow: 0 18px 24px rgba(17, 21, 27, 0.1);
    }

    body.nav-open .main-nav a {
        padding: 14px 0;
        border-bottom: 1px solid var(--line);
        font-size: 0.96rem;
    }

    body.nav-open .main-nav a:last-child {
        border-bottom: 0;
    }

    .hero-inner {
        grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
        min-height: 0;
        padding: 47px 0 30px;
        gap: 24px 30px;
    }

    .hero-copy {
        grid-column: 1 / -1;
        max-width: 700px;
        margin: 0 auto;
        text-align: center;
    }

    .kicker {
        justify-content: center;
    }

    .hero-lede {
        margin-right: auto;
        margin-left: auto;
    }

    .hero-actions,
    .hero-facts {
        justify-content: center;
    }

    .hero-note {
        margin-right: auto;
        margin-left: auto;
    }

    .hero-page {
        justify-self: center;
        max-width: 250px;
    }

    .hero-page--left {
        margin-left: auto;
    }

    .hero-page--right {
        margin-right: auto;
    }

    .section {
        padding: 78px 0;
    }

    .section-head {
        grid-template-columns: 1fr;
        gap: 18px;
        margin-bottom: 36px;
    }

    .section-intro {
        max-width: 46em;
    }

    .download-panel {
        grid-template-columns: 1fr;
    }

    .download-main {
        border-right: 0;
        border-bottom: 1.5px solid var(--ink);
    }

    .install-grid {
        grid-template-columns: 1fr;
        gap: 37px;
    }

    .phone-stage {
        order: 2;
    }

    .faq-layout {
        grid-template-columns: 1fr;
        gap: 34px;
    }

    .faq-intro {
        position: static;
    }

    .faq-intro > p {
        max-width: 40em;
    }

    .notice-inner {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .notice-list {
        gap: 18px;
    }

    .footer-support {
        align-items: flex-start;
        flex-direction: column;
    }

    .footer-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 32px;
    }

    .footer-brand {
        grid-column: 1 / -1;
    }

    .footer-bottom {
        align-items: flex-start;
        flex-direction: column;
    }
}

@media (max-width: 760px) {
    .container {
        width: calc(100% - 40px);
    }

    .header-inner {
        width: calc(100% - 40px);
    }

    body.nav-open .main-nav {
        right: -20px;
        left: -20px;
        padding-right: 20px;
        padding-left: 20px;
    }

    .brand-text strong {
        font-size: 1rem;
    }

    .hero-inner {
        width: calc(100% - 40px);
        padding-top: 39px;
        gap: 20px;
    }

    .hero h1 {
        margin-top: 17px;
        margin-bottom: 19px;
        font-size: clamp(2.62rem, 9.2vw, 3.6rem);
        letter-spacing: -0.06em;
    }

    .hero-lede {
        font-size: 0.93rem;
        line-height: 1.8;
    }

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

    .hero-actions .btn {
        flex: 1 1 200px;
    }

    .hero-facts {
        margin-top: 24px;
        padding-top: 16px;
    }

    .hero-facts li {
        margin-right: 16px;
        padding-right: 16px;
    }

    .hero-facts strong {
        font-size: 0.82rem;
    }

    .hero-facts span {
        font-size: 0.62rem;
    }

    .hero-page {
        max-width: none;
        padding: 6px 6px 24px;
    }

    .hero-page img {
        height: 218px;
        aspect-ratio: auto;
    }

    .hero-page figcaption {
        right: 8px;
        bottom: 6px;
        left: 8px;
        font-size: 0.44rem;
    }

    .hero-page--left {
        box-shadow: 6px 6px 0 var(--orange);
    }

    .hero-page--right {
        box-shadow: -6px 6px 0 var(--orange);
    }

    .hero-strip {
        align-items: flex-start;
        flex-direction: column;
        gap: 7px;
        padding: 11px 20px 13px;
        font-size: 0.67rem;
    }

    .section {
        padding: 66px 0;
    }

    .section h2 {
        font-size: clamp(2.05rem, 8vw, 2.8rem);
    }

    .section-head {
        margin-bottom: 30px;
    }

    .download-main {
        padding: 26px 20px;
    }

    .download-side {
        padding: 27px 20px;
    }

    .dl-title {
        flex-wrap: wrap;
        gap: 11px;
    }

    .dl-icon {
        width: 50px;
        height: 50px;
    }

    .dl-title h3 {
        font-size: 1.18rem;
    }

    .dl-status {
        margin-left: 0;
    }

    .dl-facts {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .feature-card {
        padding: 23px 21px 25px;
    }

    .feature-icon {
        margin-bottom: 22px;
    }

    .book-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 13px;
    }

    .book-info {
        padding: 14px 13px 16px;
    }

    .book-info h3 {
        font-size: 0.98rem;
    }

    .book-info p {
        font-size: 0.73rem;
    }

    .book-tags span {
        font-size: 0.57rem;
    }

    .step {
        grid-template-columns: 40px minmax(0, 1fr);
        gap: 12px;
        padding: 20px 0;
    }

    .step-num {
        font-size: 0.94rem;
    }

    .phone-stage {
        padding: 14px 10px 25px;
    }

    .phone {
        width: min(280px, 76vw);
    }

    .phone-sticker {
        right: 2%;
    }

    .log-row {
        grid-template-columns: 92px minmax(0, 1fr);
        gap: 17px;
        padding: 21px 0;
    }

    .log-row time {
        grid-column: 2;
        padding-top: 0;
        text-align: left;
    }

    .log-main h3 {
        font-size: 0.94rem;
    }

    .log-main p {
        font-size: 0.78rem;
    }

    .faq-item summary {
        padding: 18px 0;
        font-size: 0.9rem;
    }

    .faq-answer {
        padding-right: 15px;
    }

    .notice-list {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .notice-list li {
        padding-left: 14px;
    }

    .notice-title-wrap h2 {
        font-size: 1.12rem;
    }

    .footer-support {
        padding: 23px 20px;
    }

    .footer-grid {
        gap: 27px;
        padding-top: 37px;
    }

    .footer-bottom {
        gap: 12px;
    }

    .support-dialog {
        width: calc(100vw - 22px);
        max-height: 86vh;
        box-shadow: 7px 7px 0 var(--orange);
    }

    .dialog-content {
        max-height: calc(86vh - 58px);
        padding: 22px 20px 26px;
    }

    .dialog-content h2 {
        font-size: 1.45rem;
    }

    .modal-cert dl div {
        grid-template-columns: 78px minmax(0, 1fr);
    }
}

@media (max-width: 540px) {
    .header-actions > .btn {
        display: none;
    }

    .hero-page img {
        height: 186px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-actions .btn {
        flex-basis: auto;
        width: 100%;
    }

    .hero-facts {
        justify-content: flex-start;
    }

    .hero-facts li {
        margin-right: 13px;
        padding-right: 13px;
    }

    .hero-facts li:last-child {
        margin-right: 0;
        padding-right: 0;
    }

    .hero-note {
        font-size: 0.67rem;
    }

    .btn--hero {
        min-height: 54px;
    }

    .footer-support-actions {
        width: 100%;
    }

    .footer-support-actions .btn {
        flex: 1 1 170px;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }

    .footer-brand {
        grid-column: 1 / -1;
    }

    .modal-cert {
        padding: 14px;
    }
}

@media (max-width: 395px) {
    .book-grid {
        grid-template-columns: 1fr;
    }

    .btn-version {
        display: none;
    }

    .hero-page img {
        height: 170px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }
}

@media (hover: none) {
    .book-cover img {
        filter: grayscale(0.15) contrast(1.02);
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* =========================================================
   首屏三栏图片排版
   左、中、右各占三分之一，图片铺满首屏
   ========================================================= */

.hero {
    background: #dfe3e7;
}

.hero::before {
    content: "";
    position: absolute;
    z-index: 0;
    inset: -4%;
    background: url("../images/1219385-new.webp") center top / cover no-repeat;
    opacity: 1;
    filter: blur(7px) grayscale(1) contrast(2.3) brightness(0.68);
    transform: scale(1.04);
    mix-blend-mode: multiply;
    -webkit-mask-image: none;
    mask-image: none;
    pointer-events: none;
}

.hero::after {
    content: "";
    display: block;
    position: absolute;
    z-index: 0;
    inset: 0;
    background:
        radial-gradient(circle at 50% 42%, rgba(255, 255, 255, 0.03), rgba(214, 219, 224, 0.08) 62%, rgba(198, 204, 210, 0.16)),
        linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(208, 213, 219, 0.03));
    pointer-events: none;
}

.hero-inner {
    display: grid;
    grid-template-columns: 33.333% 33.334% 33.333%;
    align-items: stretch;
    width: 100%;
    max-width: none;
    min-height: calc(100vh - 76px);
    min-height: calc(100svh - 76px);
    margin: 0;
    padding: 0;
    gap: 0;
}

.hero-page {
    position: relative;
    width: 100%;
    max-width: none;
    height: auto;
    min-height: calc(100vh - 76px);
    min-height: calc(100svh - 76px);
    padding: 0;
    border: 0;
    border-radius: 0;
    background: var(--ink);
    box-shadow: none;
    transform: none;
    animation: none;
    overflow: hidden;
}

.hero-page--left,
.hero-page--right {
    justify-self: stretch;
    margin: 0;
    box-shadow: none;
    transform: none;
}

.hero-page img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    aspect-ratio: auto;
    border: 0;
    object-fit: cover;
    object-position: center top;
    filter: contrast(1.03);
}

.hero-page--left img,
.hero-page--right img {
    aspect-ratio: auto;
}

.hero-page:hover {
    z-index: auto;
    box-shadow: none;
    transform: none;
}

.hero-page::after {
    content: "";
    position: absolute;
    z-index: 1;
    inset: 0;
    background: linear-gradient(90deg, rgba(17, 21, 27, 0) 60%, rgba(17, 21, 27, 0.13) 100%);
    pointer-events: none;
}

.hero-page--right::after {
    background: linear-gradient(270deg, rgba(17, 21, 27, 0) 60%, rgba(17, 21, 27, 0.13) 100%);
}

.hero-copy {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-self: center;
    justify-self: center;
    width: min(94%, 480px);
    max-width: none;
    min-height: 0;
    margin: 0 auto;
    padding: clamp(22px, 2.4vw, 30px);
    overflow: hidden;
    border: 1px solid rgba(17, 21, 27, 0.34);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.04));
    box-shadow:
        0 20px 55px rgba(17, 21, 27, 0.08),
        inset 0 0 0 5px rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(2px) saturate(0.85);
    -webkit-backdrop-filter: blur(2px) saturate(0.85);
    color: var(--ink);
    text-align: left;
}

.hero-copy::before {
    content: "";
    display: block;
    position: absolute;
    inset: -8%;
    z-index: 0;
    background: url("../images/1219385-new.webp") center 22% / 135% auto no-repeat;
    opacity: 0.75;
    filter: blur(4px) grayscale(1) contrast(2.4) brightness(0.66);
    pointer-events: none;
}

.hero-copy::after {
    display: none;
}

.hero-copy > * {
    position: relative;
    z-index: 1;
}

.hero .kicker {
    color: var(--orange-dark);
    font-size: 0.66rem;
    letter-spacing: 0.11em;
}

.hero h1 {
    margin: 17px 0 20px;
    color: var(--ink);
    font-size: clamp(2.45rem, 4vw, 4rem);
    line-height: 1;
    letter-spacing: -0.05em;
}

.hero h1 span {
    white-space: nowrap;
    color: var(--orange-dark);
}

.hero h1 span::after {
    background: rgba(255, 90, 54, 0.18);
}

.hero-lede {
    max-width: 32em;
    margin-right: 0;
    margin-left: 0;
    color: #333c46;
    font-size: 0.9rem;
    line-height: 1.78;
}

.hero-actions {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 10px;
    margin-top: 24px;
}

.hero-actions .btn {
    width: 100%;
    min-height: 52px;
    font-size: 0.9rem;
}

.hero-actions .btn--hero {
    box-shadow: 4px 4px 0 var(--ink);
}

.hero-actions .btn--ghost {
    border-color: rgba(17, 21, 27, 0.5);
    color: var(--ink);
}

.hero-actions .btn--ghost:hover {
    border-color: var(--ink);
    background: rgba(17, 21, 27, 0.06);
}

.hero-facts {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    margin-top: 24px;
    padding-top: 15px;
    border-top: 1px solid rgba(17, 21, 27, 0.2);
}

.hero-facts li {
    margin: 0;
    padding: 0 10px 0 0;
    border-right: 1px solid rgba(17, 21, 27, 0.16);
}

.hero-facts li:last-child {
    padding-right: 0;
    border-right: 0;
}

.hero-facts strong {
    color: var(--ink);
    font-size: 0.78rem;
}

.hero-facts span {
    color: #4d5762;
    font-size: 0.6rem;
    line-height: 1.5;
}

.hero-note {
    margin-top: 15px;
    margin-right: 0;
    margin-left: 0;
    color: #3f4953;
    font-size: 0.68rem;
    line-height: 1.6;
}

.hero-note span {
    color: #3e4853;
}

.hero-strip {
    position: absolute;
    z-index: 4;
    right: 0;
    bottom: 0;
    left: 0;
    padding: 10px clamp(20px, 3vw, 44px);
    border-top: 1px solid rgba(17, 21, 27, 0.12);
    background: rgba(238, 241, 245, 0.93);
    color: #5c6570;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

@media (max-width: 980px) {
    .hero-inner {
        grid-template-columns: 1fr 1fr;
        min-height: 0;
    }

    .hero-page {
        grid-row: 1;
        height: clamp(190px, 28vh, 270px);
        min-height: 0;
    }

    .hero-page--left {
        grid-column: 1;
    }

    .hero-page--right {
        grid-column: 2;
    }

    .hero-page::after,
    .hero-page--right::after {
        background: linear-gradient(180deg, rgba(17, 21, 27, 0), rgba(17, 21, 27, 0.13));
    }

    .hero-copy {
        grid-column: 1 / -1;
        grid-row: 2;
        width: calc(100% - 56px);
        min-height: 0;
        margin: 20px auto 38px;
        padding: 30px 22px;
        background: linear-gradient(180deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0.1));
    }

    .hero-copy::before {
        opacity: 0.55;
    }

    .hero .kicker {
        font-size: 0.68rem;
    }

    .hero h1 {
        font-size: clamp(2.7rem, 8vw, 3.9rem);
    }

    .hero-lede {
        max-width: 42em;
        font-size: 0.95rem;
    }

    .hero-actions {
        flex-direction: row;
        align-items: center;
        gap: 12px;
    }

    .hero-actions .btn {
        width: auto;
    }

    .hero-actions .btn--hero {
        flex: 1 1 220px;
    }

    .hero-actions .btn--ghost {
        flex: 0 0 auto;
    }

    .hero-facts {
        margin-top: 26px;
    }

    .hero-facts strong {
        font-size: 0.82rem;
    }

    .hero-facts span {
        font-size: 0.62rem;
    }

    .hero-note {
        font-size: 0.7rem;
    }

    .hero-strip {
        position: static;
        background: #eef1f5;
    }
}

@media (max-width: 560px) {
    .hero-page {
        height: clamp(160px, 24vh, 220px);
    }

    .hero-copy {
        width: calc(100% - 40px);
        padding: 36px 20px 50px;
    }

    .hero h1 {
        font-size: clamp(2.2rem, 10vw, 3.1rem);
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .hero-facts {
        margin-top: 22px;
    }

    .hero-facts li {
        padding-right: 8px;
        margin-right: 0;
    }

    .hero-facts strong {
        font-size: 0.76rem;
    }

    .hero-facts span {
        font-size: 0.58rem;
    }

    .hero-note {
        font-size: 0.66rem;
    }

    .hero-strip {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }
}

@media (max-height: 700px) and (min-width: 981px) {
    .hero-strip {
        position: static;
    }
}