:root {
    --ink: #17201d;
    --muted: #5b6863;
    --line: #d8dfdc;
    --surface: #ffffff;
    --surface-soft: #f3f6f4;
    --primary: #146c53;
    --primary-dark: #0d513f;
    --accent: #d95f50;
    --accent-soft: #f9e9e6;
    --shadow: 0 18px 50px rgba(25, 48, 40, 0.12);
    --container: 1180px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--ink);
    background: var(--surface);
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif;
    line-height: 1.7;
    letter-spacing: 0;
}

body.menu-open {
    overflow: hidden;
}

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

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

button,
a {
    -webkit-tap-highlight-color: transparent;
}

.container {
    width: min(var(--container), calc(100% - 40px));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(12px);
}

.header-inner {
    min-height: 72px;
    display: flex;
    align-items: center;
    gap: 28px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    flex: 0 0 auto;
    font-size: 18px;
    font-weight: 750;
}

.brand img,
.footer-brand img {
    border-radius: 8px;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 28px;
    margin-left: auto;
}

.site-nav a {
    position: relative;
    color: #40504a;
    font-size: 15px;
    font-weight: 650;
}

.site-nav a::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -9px;
    height: 2px;
    background: var(--primary);
    transform: scaleX(0);
    transition: transform 0.2s ease;
}

.site-nav a:hover,
.site-nav a.is-active {
    color: var(--primary-dark);
}

.site-nav a:hover::after,
.site-nav a.is-active::after {
    transform: scaleX(1);
}

.header-actions,
.download-actions,
.inline-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.button {
    min-height: 42px;
    padding: 9px 18px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid transparent;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 700;
    line-height: 1.2;
    transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.button:hover {
    transform: translateY(-1px);
}

.button-primary {
    color: #ffffff;
    background: var(--primary);
    border-color: var(--primary);
}

.button-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

.button-secondary {
    color: var(--primary-dark);
    background: #ffffff;
    border-color: #9eb7ae;
}

.button-secondary:hover,
.button-ghost:hover {
    background: var(--surface-soft);
    border-color: var(--primary);
}

.button-ghost {
    color: var(--primary-dark);
    background: transparent;
    border-color: var(--line);
}

.button-large {
    min-width: 136px;
    min-height: 48px;
    padding: 12px 24px;
    font-size: 16px;
}

.menu-toggle {
    display: none;
    width: 42px;
    height: 42px;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: #ffffff;
}

.menu-toggle span {
    display: block;
    height: 2px;
    margin: 4px 0;
    background: var(--ink);
}

.hero {
    overflow: hidden;
    background: linear-gradient(90deg, #f7faf8 0%, #ffffff 56%, #f1f6f4 100%);
    border-bottom: 1px solid var(--line);
}

.hero-grid {
    min-height: 560px;
    display: grid;
    grid-template-columns: minmax(0, 1.02fr) minmax(420px, 0.98fr);
    align-items: center;
    gap: 72px;
    padding-top: 42px;
    padding-bottom: 42px;
}

.eyebrow {
    margin-bottom: 12px;
    color: var(--primary);
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

h1,
h2,
h3 {
    line-height: 1.25;
    letter-spacing: 0;
}

.hero h1 {
    max-width: 620px;
    margin-bottom: 22px;
    font-size: 48px;
    font-weight: 800;
}

.hero h1 span {
    display: inline-block;
}

.hero-copy > p {
    max-width: 620px;
    margin-bottom: 28px;
    color: #4c5d57;
    font-size: 17px;
}

.hero-notes {
    margin-top: 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    color: var(--muted);
    font-size: 13px;
}

.hero-notes span {
    position: relative;
    padding-left: 13px;
}

.hero-notes span::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.68em;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--accent);
}

.hero-media {
    position: relative;
    min-height: 472px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 18px 84px 46px 28px;
    background: #e7efeb;
    border: 1px solid #ccd9d4;
    border-radius: 8px;
}

.phone-lightbox {
    position: relative;
    z-index: 2;
    width: 245px;
    height: 436px;
    overflow: hidden;
    border: 8px solid #18211e;
    border-radius: 26px;
    background: #18211e;
    box-shadow: var(--shadow);
}

.phone-lightbox img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.episode-tabs {
    position: absolute;
    right: 22px;
    top: 82px;
    display: grid;
    gap: 10px;
}

.episode-tabs span {
    width: 72px;
    padding: 10px 8px;
    color: #44534d;
    background: #ffffff;
    border: 1px solid #c8d4cf;
    border-radius: 4px;
    text-align: center;
    font-size: 13px;
    font-weight: 700;
}

.episode-tabs span:nth-child(2) {
    color: #ffffff;
    background: var(--accent);
    border-color: var(--accent);
}

.platform-strip {
    position: absolute;
    left: 24px;
    right: 24px;
    bottom: 16px;
    z-index: 3;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 12px;
    border-top: 1px solid #bccbc5;
    color: #43524c;
    font-size: 12px;
}

.platform-strip strong {
    color: var(--primary-dark);
    font-size: 14px;
}

.section {
    padding: 80px 0;
}

.section:nth-of-type(even) {
    background: var(--surface-soft);
}

.section-heading {
    margin-bottom: 34px;
}

.section-heading h2,
.prep-heading h2,
.final-cta h2 {
    margin-bottom: 0;
    font-size: 32px;
}

.heading-split {
    display: grid;
    grid-template-columns: 1fr minmax(320px, 0.7fr);
    align-items: end;
    gap: 40px;
}

.section-note {
    color: var(--muted);
    font-size: 15px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.feature-item {
    min-height: 260px;
    padding: 28px 24px;
    border-right: 1px solid var(--line);
}

.feature-item:last-child {
    border-right: 0;
}

.feature-index {
    color: var(--accent);
    font-size: 13px;
    font-weight: 800;
}

.feature-item h3 {
    margin: 44px 0 12px;
    font-size: 20px;
}

.feature-item p {
    margin-bottom: 0;
    color: var(--muted);
    font-size: 14px;
}

.section-gallery {
    background: #ffffff !important;
}

.gallery-grid {
    display: grid;
    grid-template-columns: 1.1fr 1fr 1fr;
    gap: 24px;
    align-items: start;
}

.gallery-item {
    margin: 0;
}

.gallery-frame {
    min-height: 460px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 28px;
    overflow: hidden;
    background: #e7eeeb;
    border: 1px solid #d1dbd7;
    border-radius: 8px;
}

.gallery-item-main .gallery-frame {
    background: #dfe8e4;
}

.gallery-frame img {
    width: auto;
    max-width: 400px;
    max-height: 430px;
    border-radius: 6px;
    box-shadow: 0 15px 34px rgba(28, 49, 42, 0.16);
}

.gallery-item figcaption {
    display: grid;
    gap: 4px;
    padding: 14px 2px 0;
}

.gallery-item figcaption strong {
    font-size: 17px;
}

.gallery-item figcaption span {
    color: var(--muted);
    font-size: 13px;
}

.section-prep {
    background: #17201d !important;
    color: #ffffff;
}

.prep-grid {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 80px;
}

.prep-heading .eyebrow,
.final-cta .eyebrow {
    color: #79c6a9;
}

.prep-content > p {
    color: #d8e2de;
    font-size: 16px;
}

.check-list {
    margin: 24px 0;
    padding: 0;
    list-style: none;
    border-top: 1px solid #3c4944;
}

.check-list li {
    padding: 13px 0 13px 28px;
    position: relative;
    border-bottom: 1px solid #3c4944;
    color: #e6ece9;
}

.check-list li::before {
    content: "✓";
    position: absolute;
    left: 2px;
    color: #79c6a9;
    font-weight: 800;
}

.text-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    font-weight: 750;
}

.section-prep .text-link {
    color: #8ed6bb;
}

.text-link span {
    transition: transform 0.2s ease;
}

.text-link:hover span {
    transform: translateX(3px);
}

.route-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.route-item {
    min-height: 210px;
    padding: 28px;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #ffffff;
    transition: border-color 0.2s ease, transform 0.2s ease;
}

.route-item:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
}

.route-item span {
    color: var(--accent);
    font-size: 13px;
    font-weight: 800;
}

.route-item strong {
    max-width: 480px;
    margin: 28px 0;
    font-size: 20px;
    line-height: 1.5;
}

.route-item em {
    margin-top: auto;
    color: var(--primary);
    font-size: 14px;
    font-style: normal;
    font-weight: 750;
}

.faq-preview-grid {
    display: grid;
    grid-template-columns: 0.65fr 1.35fr;
    gap: 70px;
}

.faq-preview-list details,
.faq-group details {
    border-bottom: 1px solid var(--line);
}

summary {
    position: relative;
    padding: 19px 38px 19px 0;
    cursor: pointer;
    list-style: none;
    font-weight: 750;
}

summary::-webkit-details-marker {
    display: none;
}

summary::after {
    content: "+";
    position: absolute;
    right: 4px;
    top: 17px;
    color: var(--primary);
    font-size: 22px;
    line-height: 1;
}

details[open] summary::after {
    content: "−";
}

details p {
    margin-bottom: 20px;
    color: var(--muted);
}

.faq-preview-list .text-link {
    margin-top: 24px;
}

.final-cta {
    padding: 54px 0;
    color: #ffffff;
    background: var(--primary-dark);
}

.final-cta-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

.final-cta .button-primary {
    color: var(--primary-dark);
    background: #ffffff;
    border-color: #ffffff;
}

.final-cta .button-secondary {
    color: #ffffff;
    background: transparent;
    border-color: #86b6a4;
}

.site-footer {
    padding: 48px 0;
    background: #ffffff;
    border-top: 1px solid var(--line);
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-nav {
    display: flex;
    gap: 24px;
    margin: 20px 0;
    color: #42514b;
    font-size: 14px;
}

.footer-inner p {
    max-width: 760px;
    margin-bottom: 10px;
    color: var(--muted);
    font-size: 13px;
}

.footer-inner small {
    color: #78827e;
}

.inner-main {
    background: var(--surface);
}

.inner-hero,
.faq-hero {
    background: var(--surface-soft);
    border-bottom: 1px solid var(--line);
}

.inner-hero-grid {
    min-height: 510px;
    display: grid;
    grid-template-columns: 1fr 330px;
    align-items: center;
    gap: 100px;
    padding-top: 52px;
    padding-bottom: 52px;
}

.inner-hero h1,
.faq-hero h1 {
    margin-bottom: 20px;
    font-size: 43px;
}

.inner-hero p,
.faq-hero p {
    max-width: 680px;
    color: var(--muted);
    font-size: 17px;
}

.inner-hero .download-actions {
    margin-top: 26px;
}

.inner-hero-grid > img {
    width: auto;
    max-width: 260px;
    max-height: 400px;
    justify-self: center;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.article-layout {
    display: grid;
    grid-template-columns: 230px minmax(0, 1fr);
    gap: 70px;
    align-items: start;
}

.article-index {
    position: sticky;
    top: 104px;
    display: grid;
    padding: 20px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #ffffff;
}

.article-index strong {
    margin-bottom: 10px;
}

.article-index a {
    padding: 8px 0;
    color: var(--muted);
    font-size: 14px;
}

.article-index a:hover {
    color: var(--primary);
}

.article-content {
    max-width: 780px;
}

.article-content section {
    padding-bottom: 44px;
    margin-bottom: 44px;
    border-bottom: 1px solid var(--line);
    scroll-margin-top: 100px;
}

.article-content section:last-child {
    padding-bottom: 0;
    margin-bottom: 0;
    border-bottom: 0;
}

.step-number {
    color: var(--accent);
    font-size: 13px;
    font-weight: 800;
}

.article-content h2 {
    margin: 8px 0 18px;
    font-size: 27px;
}

.article-content p {
    color: #4b5a55;
}

.article-content a:not(.button) {
    color: var(--primary);
    font-weight: 700;
}

.inline-actions {
    margin-top: 24px;
    justify-content: space-between;
}

.faq-hero-grid {
    min-height: 390px;
    display: grid;
    grid-template-columns: 1fr 380px;
    align-items: center;
    gap: 80px;
    padding-top: 52px;
    padding-bottom: 52px;
}

.faq-hero-panel {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    border: 1px solid var(--line);
    background: #ffffff;
}

.faq-hero-panel span {
    grid-column: 1 / -1;
    padding: 12px 16px;
    color: var(--muted);
    border-bottom: 1px solid var(--line);
    font-size: 13px;
}

.faq-hero-panel strong {
    padding: 20px 16px;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    font-size: 18px;
}

.faq-hero-panel strong:nth-of-type(even) {
    border-right: 0;
}

.faq-layout {
    max-width: 940px;
}

.faq-group {
    margin-bottom: 62px;
}

.faq-group-title {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.faq-group-title span {
    color: var(--accent);
    font-size: 13px;
    font-weight: 800;
}

.faq-group-title h2 {
    margin: 0;
    font-size: 28px;
}

.faq-group summary {
    font-size: 17px;
}

.faq-help {
    padding: 34px;
    border: 1px solid #bfd0c9;
    border-radius: 8px;
    background: #eef5f2;
}

.faq-help h2 {
    margin-bottom: 18px;
    font-size: 24px;
}

.faq-help ol {
    margin: 0 0 24px;
    padding-left: 22px;
    color: #465650;
}

@media (max-width: 1000px) {
    .header-inner {
        gap: 16px;
    }

    .site-nav {
        gap: 18px;
    }

    .header-actions .button-ghost {
        display: none;
    }

    .hero-grid {
        grid-template-columns: minmax(0, 1fr) minmax(360px, 0.9fr);
        gap: 38px;
    }

    .hero h1 {
        font-size: 42px;
    }

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

    .feature-item:nth-child(2) {
        border-right: 0;
    }

    .feature-item:nth-child(-n+2) {
        border-bottom: 1px solid var(--line);
    }

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

    .gallery-item:last-child {
        grid-column: 1 / -1;
    }

    .inner-hero-grid,
    .faq-hero-grid {
        gap: 40px;
    }
}

@media (max-width: 760px) {
    .container {
        width: min(100% - 28px, var(--container));
    }

    .site-header {
        position: relative;
    }

    .header-inner {
        min-height: 64px;
    }

    .brand img {
        width: 42px;
        height: 42px;
    }

    .brand span {
        font-size: 17px;
    }

    .menu-toggle {
        display: block;
        margin-left: auto;
    }

    .site-nav {
        position: absolute;
        left: 14px;
        right: 14px;
        top: 64px;
        display: none;
        margin: 0;
        padding: 12px;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        background: #ffffff;
        border: 1px solid var(--line);
        border-radius: 8px;
        box-shadow: var(--shadow);
    }

    .site-nav.is-open {
        display: flex;
    }

    .site-nav a {
        padding: 11px 8px;
    }

    .site-nav a::after {
        display: none;
    }

    .header-actions {
        display: none;
    }

    .hero-grid {
        min-height: 0;
        grid-template-columns: 1fr;
        gap: 26px;
        padding-top: 32px;
        padding-bottom: 34px;
    }

    .hero h1 {
        max-width: 350px;
        margin-bottom: 14px;
        font-size: 34px;
    }

    .hero-copy > p {
        margin-bottom: 20px;
        font-size: 15px;
        line-height: 1.65;
    }

    .download-actions {
        align-items: stretch;
    }

    .button-large {
        min-width: 0;
        min-height: 46px;
        padding: 11px 18px;
    }

    .hero-notes {
        margin-top: 14px;
        gap: 4px 14px;
    }

    .hero-media {
        min-height: 286px;
        padding: 14px 56px 38px 16px;
    }

    .phone-lightbox {
        width: 144px;
        height: 256px;
        border-width: 5px;
        border-radius: 18px;
    }

    .episode-tabs {
        right: 12px;
        top: 38px;
        gap: 6px;
    }

    .episode-tabs span {
        width: 53px;
        padding: 6px 4px;
        font-size: 11px;
    }

    .platform-strip {
        left: 14px;
        right: 14px;
        bottom: 10px;
        padding-top: 8px;
    }

    .section {
        padding: 58px 0;
    }

    .section-heading {
        margin-bottom: 24px;
    }

    .section-heading h2,
    .prep-heading h2,
    .final-cta h2 {
        font-size: 27px;
    }

    .heading-split,
    .prep-grid,
    .faq-preview-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .heading-split .section-note {
        display: none;
    }

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

    .feature-item,
    .feature-item:nth-child(2) {
        min-height: 0;
        border-right: 0;
        border-bottom: 1px solid var(--line);
    }

    .feature-item:last-child {
        border-bottom: 0;
    }

    .feature-item h3 {
        margin-top: 22px;
    }

    .gallery-grid,
    .route-grid {
        grid-template-columns: 1fr;
    }

    .gallery-item:last-child {
        grid-column: auto;
    }

    .gallery-frame {
        min-height: 380px;
        padding: 22px;
    }

    .gallery-frame img {
        max-height: 350px;
    }

    .prep-grid {
        gap: 30px;
    }

    .route-item {
        min-height: 180px;
    }

    .final-cta-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .final-cta-inner .download-actions {
        width: 100%;
    }

    .final-cta-inner .button {
        flex: 1;
    }

    .footer-nav {
        gap: 18px;
    }

    .inner-hero-grid,
    .faq-hero-grid {
        min-height: 0;
        grid-template-columns: 1fr;
        gap: 28px;
        padding-top: 38px;
        padding-bottom: 38px;
    }

    .inner-hero h1,
    .faq-hero h1 {
        font-size: 30px;
    }

    .inner-hero-grid > img {
        max-width: 170px;
        max-height: 300px;
    }

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

    .article-index {
        position: static;
        grid-template-columns: repeat(2, 1fr);
    }

    .article-index strong {
        grid-column: 1 / -1;
    }

    .article-content h2 {
        font-size: 24px;
    }

    .inline-actions {
        align-items: flex-start;
        flex-direction: column;
    }

    .faq-hero-panel {
        grid-template-columns: repeat(4, 1fr);
    }

    .faq-hero-panel span {
        grid-column: 1 / -1;
    }

    .faq-hero-panel strong {
        padding: 14px 8px;
        border-bottom: 0;
        font-size: 14px;
        text-align: center;
    }

    .faq-hero-panel strong:nth-of-type(even) {
        border-right: 1px solid var(--line);
    }

    .faq-hero-panel strong:last-child {
        border-right: 0;
    }

    .faq-group {
        margin-bottom: 48px;
    }

    .faq-group-title h2 {
        font-size: 25px;
    }

    .faq-group summary {
        font-size: 16px;
    }

    .faq-help {
        padding: 24px;
    }
}

@media (max-width: 390px) {
    .brand span {
        max-width: 112px;
        line-height: 1.25;
    }

    .download-actions {
        flex-direction: column;
    }

    .hero .download-actions {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }

    .hero h1 {
        font-size: 31px;
    }

    .footer-nav {
        flex-wrap: wrap;
        justify-content: center;
    }
}