@charset "UTF-8";

:root {
    --primary: #165dff;
    --primary-dark: #0e42cc;
    --primary-light: #e8f3ff;
    --primary-softer: #84adff;
    --secondary: #f53f3f;
    --secondary-dark: #d82a2a;
    --accent: #ff7d00;
    --accent-dark: #e06a00;
    --text-dark: #1d2129;
    --text-medium: #4e5969;
    --text-light: #86909c;
    --bg-light: #f2f3f5;
    --bg-white: #ffffff;
    --bg-blue-light: #f0f5ff;
    --border: #e5e6eb;
    --shadow: 0 0.25rem 1.25rem rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 0.65rem 2rem rgba(0, 0, 0, 0.13);
    --radius: 0.625rem;
    --container-max: 90rem;
    --header-height: 5rem;
    --focus-ring: 0 0 0 0.2rem rgba(22, 93, 255, 0.24);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-height) + 1rem);
}

body {
    min-width: 20rem;
    margin: 0;
    color: var(--text-dark);
    background: var(--bg-white);
    font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.7;
    overflow-x: hidden;
}

body.nav-open {
    overflow: hidden;
}

img,
svg,
video,
canvas,
iframe {
    max-width: 100%;
}

img {
    height: auto;
}

button,
input,
select,
textarea {
    font: inherit;
}

button {
    color: inherit;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition:
        color 0.2s ease,
        background-color 0.2s ease,
        border-color 0.2s ease,
        box-shadow 0.2s ease,
        transform 0.2s ease,
        opacity 0.2s ease;
}

a:hover {
    color: var(--primary-dark);
}

a:focus-visible {
    outline: 0.125rem solid var(--primary);
    outline-offset: 0.2rem;
    border-radius: 0.25rem;
}

a:active {
    color: var(--primary-dark);
    transform: translateY(0.0625rem);
}

a[aria-disabled="true"],
a.disabled {
    color: var(--text-light);
    pointer-events: none;
    cursor: not-allowed;
    opacity: 0.56;
}

p,
h1,
h2,
h3,
h4,
h5,
h6,
ul,
ol,
figure,
blockquote {
    margin-top: 0;
}

.container {
    width: min(calc(100% - 2rem), var(--container-max));
    margin-inline: auto;
}

.site-main,
main {
    min-width: 0;
}

.inner-section {
    min-height: calc(100vh - var(--header-height));
}

.card {
    position: relative;
    overflow: hidden;
    background: var(--bg-white);
    border: 0.0625rem solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition:
        border-color 0.25s ease,
        box-shadow 0.25s ease,
        transform 0.25s ease;
}

.card::before {
    content: "";
    position: absolute;
    inset: 0 auto auto 0;
    width: 100%;
    height: 0.25rem;
    background: linear-gradient(90deg, var(--primary), var(--primary-softer));
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 0.25s ease;
}

.card:hover {
    border-color: rgba(22, 93, 255, 0.24);
    box-shadow: var(--shadow-hover);
    transform: translateY(-0.25rem);
}

.card:hover::before {
    transform: scaleX(1);
}

.btn {
    display: inline-flex;
    min-height: 2.75rem;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.72rem 1.45rem;
    border: 0.0625rem solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 650;
    line-height: 1.2;
    text-align: center;
    transition:
        color 0.2s ease,
        background-color 0.2s ease,
        border-color 0.2s ease,
        box-shadow 0.2s ease,
        transform 0.2s ease;
}

.btn:hover {
    transform: translateY(-0.125rem);
}

.btn:focus-visible {
    box-shadow: var(--focus-ring);
}

.btn:active {
    transform: translateY(0);
}

.btn[aria-disabled="true"],
.btn.disabled,
.btn:disabled {
    cursor: not-allowed;
    opacity: 0.52;
    pointer-events: none;
}

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

.btn-primary:hover,
.btn-primary:focus-visible {
    color: #ffffff;
    background: var(--primary-dark);
    box-shadow: 0 0.35rem 1rem rgba(22, 93, 255, 0.3);
}

.btn-primary:active {
    background: #0b36aa;
}

.btn-secondary {
    color: #ffffff;
    background: var(--secondary);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
    color: #ffffff;
    background: var(--secondary-dark);
    box-shadow: 0 0.35rem 1rem rgba(245, 63, 63, 0.28);
}

.btn-secondary:active {
    background: #b82424;
}

.btn-accent {
    color: #ffffff;
    background: var(--accent);
}

.btn-accent:hover,
.btn-accent:focus-visible {
    color: #ffffff;
    background: var(--accent-dark);
    box-shadow: 0 0.35rem 1rem rgba(255, 125, 0, 0.28);
}

.btn-accent:active {
    background: #bd5800;
}

.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    color: var(--text-dark);
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 0.0625rem solid rgba(229, 230, 235, 0.9);
    box-shadow: 0 0.15rem 0.7rem rgba(0, 0, 0, 0.05);
    backdrop-filter: blur(0.75rem);
    transition:
        background-color 0.2s ease,
        box-shadow 0.2s ease;
}

.header.is-scrolled {
    background: rgba(255, 255, 255, 0.985);
    box-shadow: 0 0.35rem 1.2rem rgba(0, 0, 0, 0.09);
}

.header-container {
    display: flex;
    min-height: var(--header-height);
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.logo,
.footer-logo-link {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    font-weight: 750;
}

.logo {
    flex: 0 0 auto;
    color: var(--primary);
    font-size: 1.35rem;
}

.logo:hover,
.logo:focus-visible {
    color: var(--primary-dark);
}

.logo:active {
    transform: scale(0.99);
}

.logo i,
.footer-logo i {
    font-size: 1.55rem;
}

.main-navigation {
    min-width: 0;
}

.dnf-nav-list {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: clamp(0.8rem, 1.4vw, 1.75rem);
    margin: 0;
    padding: 0;
    list-style: none;
}

.dnf-nav-list li {
    min-width: 0;
}

.dnf-nav-link {
    position: relative;
    display: inline-flex;
    align-items: center;
    min-height: 2.75rem;
    padding: 0.55rem 0;
    color: var(--text-medium);
    font-weight: 550;
    white-space: nowrap;
}

.dnf-nav-link::after {
    content: "";
    position: absolute;
    inset: auto 0 0;
    height: 0.125rem;
    background: var(--primary);
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 0.2s ease;
}

.dnf-nav-link:hover,
.dnf-nav-link:focus-visible,
.dnf-nav-link.is-current {
    color: var(--primary);
}

.dnf-nav-link:hover::after,
.dnf-nav-link:focus-visible::after,
.dnf-nav-link.is-current::after {
    transform: scaleX(1);
}

.dnf-nav-link:active {
    color: var(--primary-dark);
}

.nav-toggle {
    display: none;
    width: 2.75rem;
    height: 2.75rem;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 0.3rem;
    padding: 0.55rem;
    color: var(--primary);
    background: var(--primary-light);
    border: 0.0625rem solid rgba(22, 93, 255, 0.18);
    border-radius: var(--radius);
    cursor: pointer;
    transition:
        background-color 0.2s ease,
        border-color 0.2s ease,
        box-shadow 0.2s ease;
}

.nav-toggle:hover {
    background: #dceaff;
    border-color: rgba(22, 93, 255, 0.38);
}

.nav-toggle:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.nav-toggle:active {
    background: #cfdeff;
}

.nav-toggle-line {
    display: block;
    width: 1.25rem;
    height: 0.125rem;
    background: currentColor;
    border-radius: 999px;
    transition:
        opacity 0.2s ease,
        transform 0.2s ease;
}

.nav-toggle.is-active .nav-toggle-line:nth-child(1) {
    transform: translateY(0.425rem) rotate(45deg);
}

.nav-toggle.is-active .nav-toggle-line:nth-child(2) {
    opacity: 0;
}

.nav-toggle.is-active .nav-toggle-line:nth-child(3) {
    transform: translateY(-0.425rem) rotate(-45deg);
}

.section-hero,
.section-features,
.section-functions,
.section-efficiency,
.section-faq,
.section-articles {
    padding-block: clamp(3.75rem, 5vw, 5.75rem);
}

.section-hero {
    position: relative;
    overflow: hidden;
    color: #ffffff;
    background: linear-gradient(15deg, #a389d5 0%, var(--primary) 100%);
}

.section-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

.section-features,
.section-efficiency,
.section-articles {
    background: var(--bg-white);
}

.section-functions,
.section-faq {
    background: var(--bg-light);
}

.hero-container {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(20rem, 0.92fr);
    align-items: center;
    gap: clamp(2.5rem, 5vw, 5.5rem);
}

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

.hero-title {
    margin: 0 0 1rem;
    font-size: clamp(2rem, 3vw, 3.5rem);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    margin: 0 0 1rem;
    font-size: clamp(1.05rem, 1.4vw, 1.3rem);
    opacity: 0.94;
}

.hero-features {
    display: grid;
    gap: 0.75rem;
    margin: 1.5rem 0 2rem;
    padding: 0;
    list-style: none;
}

.hero-feature {
    display: flex;
    align-items: flex-start;
    gap: 0.7rem;
}

.hero-feature i {
    margin-top: 0.3rem;
    color: #40cfff;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.9rem;
}

.hero-image {
    min-width: 0;
}

.hero-image img {
    display: block;
    width: 100%;
    border: 0.0625rem solid rgba(255, 255, 255, 0.18);
    border-radius: calc(var(--radius) + 0.15rem);
    box-shadow: 0 1rem 3rem rgba(20, 30, 80, 0.28);
}

.section-title {
    position: relative;
    width: fit-content;
    max-width: 100%;
    margin: 0 auto clamp(2.8rem, 4vw, 4rem);
    color: var(--text-dark);
    font-size: clamp(1.8rem, 2.4vw, 2.55rem);
    line-height: 1.25;
    text-align: center;
}

.section-title::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: -1rem;
    width: 3.75rem;
    height: 0.22rem;
    background: var(--primary);
    border-radius: 999px;
    transform: translateX(-50%);
}

.section-hero .section-title {
    color: #ffffff;
}

.section-hero .section-title::after {
    background: #ffffff;
}

.features-grid,
.functions-grid,
.efficiency-grid {
    display: grid;
    gap: 1.5rem;
}

.features-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.efficiency-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.feature-card,
.efficiency-card {
    padding: clamp(1.6rem, 2.2vw, 2.25rem);
    text-align: center;
}

.feature-icon,
.efficiency-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    background: var(--primary-light);
    border-radius: 50%;
    transition:
        color 0.25s ease,
        background-color 0.25s ease,
        transform 0.25s ease;
}

.feature-icon {
    width: 4.75rem;
    height: 4.75rem;
    margin-bottom: 1.4rem;
    font-size: 1.9rem;
}

.efficiency-icon {
    width: 4.25rem;
    height: 4.25rem;
    margin-bottom: 1.1rem;
    font-size: 1.65rem;
}

.feature-card:hover .feature-icon,
.efficiency-card:hover .efficiency-icon {
    color: #ffffff;
    background: var(--primary);
    transform: scale(1.07);
}

.feature-title,
.function-content h3 {
    color: var(--text-dark);
}

.feature-title {
    margin: 0 0 0.75rem;
    font-size: 1.25rem;
}

.feature-desc,
.function-content p,
.efficiency-desc {
    margin: 0;
    color: var(--text-medium);
}

.function-item {
    display: flex;
    align-items: flex-start;
    gap: 1.2rem;
    padding: 1.5rem;
}

.function-icon {
    display: inline-flex;
    width: 3.25rem;
    height: 3.25rem;
    flex: 0 0 3.25rem;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    background: var(--primary-light);
    border-radius: var(--radius);
    font-size: 1.25rem;
    transition:
        color 0.25s ease,
        background-color 0.25s ease,
        transform 0.25s ease;
}

.function-item:hover .function-icon {
    color: #ffffff;
    background: var(--primary);
    transform: rotate(4deg);
}

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

.function-content h3 {
    margin: 0 0 0.45rem;
    font-size: 1.08rem;
}

.efficiency-card {
    border-color: var(--border);
}

.efficiency-value {
    display: inline-block;
    margin-bottom: 0.55rem;
    color: var(--primary);
    font-size: clamp(2rem, 2.5vw, 2.8rem);
    font-weight: 750;
    line-height: 1;
}

.efficiency-label {
    margin-bottom: 0.45rem;
    color: var(--text-dark);
    font-size: 1.05rem;
    font-weight: 650;
}

.efficiency-desc {
    font-size: 0.92rem;
    line-height: 1.65;
}

.efficiency-note {
    max-width: 48rem;
    margin: 2.75rem auto 0;
    padding-top: 1.5rem;
    color: var(--text-medium);
    border-top: 0.0625rem dashed var(--border);
    text-align: center;
}

.efficiency-note p {
    margin: 0;
}

.efficiency-note strong {
    color: var(--primary);
}

.faq-container {
    max-width: 68rem;
    margin-inline: auto;
}

.faq-list {
    display: grid;
    gap: 1rem;
}

.faq-item {
    position: relative;
    overflow: hidden;
    background: var(--bg-white);
    border: 0.0625rem solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 0.2rem 0.8rem rgba(0, 0, 0, 0.05);
    transition:
        border-color 0.25s ease,
        box-shadow 0.25s ease,
        transform 0.25s ease;
}

.faq-item:hover {
    border-color: rgba(22, 93, 255, 0.22);
    box-shadow: 0 0.5rem 1.3rem rgba(0, 0, 0, 0.08);
    transform: translateY(-0.125rem);
}

.faq-item summary {
    position: relative;
    display: flex;
    min-height: 4.5rem;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.15rem 1.4rem;
    color: var(--text-dark);
    cursor: pointer;
    font-weight: 650;
    list-style: none;
}

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

.faq-item summary::marker {
    content: "";
}

.faq-item summary i {
    display: inline-flex;
    width: 2rem;
    height: 2rem;
    flex: 0 0 2rem;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    background: var(--primary-light);
    border-radius: 50%;
    transition:
        color 0.25s ease,
        background-color 0.25s ease,
        transform 0.25s ease;
}

.faq-item[open] summary i {
    color: #ffffff;
    background: var(--primary);
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 1.4rem 1.35rem;
}

.faq-answer-content {
    padding-top: 1rem;
    color: var(--text-medium);
    border-top: 0.0625rem dashed var(--border);
}

.faq-answer-content p {
    margin: 0;
}

.articles-container {
    max-width: 68rem;
    margin-inline: auto;
}

.article-list {
    display: grid;
    gap: 1.35rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.article-list-page {
    max-width: none;
}

.article-item {
    min-width: 0;
}

.article-list:not(.article-list-page) .article-item {
    padding: clamp(1.4rem, 2vw, 1.9rem);
}

.article-card-content,
.article-item > article {
    padding: clamp(1.35rem, 2vw, 1.9rem);
}

.article-title {
    margin: 0 0 0.65rem;
    color: var(--text-dark);
    font-size: clamp(1.15rem, 1.5vw, 1.4rem);
    line-height: 1.45;
}

.article-title a,
.article-link {
    color: inherit;
    text-decoration: none;
}

.article-title a:hover,
.article-title a:focus-visible,
.article-link:hover,
.article-link:focus-visible {
    color: var(--primary);
}

.article-title a:active,
.article-link:active {
    color: var(--primary-dark);
}

.article-date {
    display: block;
    margin-bottom: 0.65rem;
    color: var(--text-light);
    font-size: 0.9rem;
}

.article-excerpt {
    margin: 0 0 1rem;
    color: var(--text-medium);
}

.articles-container .article-excerpt {
    max-width: 70ch;
}

.read-more {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--primary);
    font-weight: 600;
}

.read-more:hover,
.read-more:focus-visible {
    color: var(--primary-dark);
}

.read-more i {
    transition: transform 0.2s ease;
}

.read-more:hover i,
.read-more:focus-visible i {
    transform: translateX(0.2rem);
}

.read-all {
    margin-top: 1.5rem;
    text-align: center;
}

.footer {
    color: var(--text-light);
    background: var(--text-dark);
    padding: 3.75rem 0 1.5rem;
}

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

.footer-logo {
    margin-bottom: 1.2rem;
    font-size: 1.4rem;
    font-weight: 750;
}

.footer-logo-link {
    color: #ffffff;
}

.footer-logo-link:hover,
.footer-logo-link:focus-visible {
    color: var(--primary-softer);
}

.footer-logo-link:active {
    color: #ffffff;
}

.dnf-footer-nav-links,
.dnf-friend-nav-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.8rem 1.65rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.dnf-footer-nav-links {
    margin-bottom: 1.5rem;
}

.dnf-footer-nav-link {
    position: relative;
    display: inline-flex;
    padding: 0.25rem 0;
    color: var(--text-light);
}

.dnf-footer-nav-link::after {
    content: "";
    position: absolute;
    inset: auto 0 0;
    height: 0.0625rem;
    background: var(--primary-softer);
    transform: scaleX(0);
    transition: transform 0.2s ease;
}

.dnf-footer-nav-link:hover,
.dnf-footer-nav-link:focus-visible {
    color: #ffffff;
}

.dnf-footer-nav-link:hover::after,
.dnf-footer-nav-link:focus-visible::after {
    transform: scaleX(1);
}

.dnf-footer-nav-link:active {
    color: var(--primary-softer);
}

.friend-links {
    width: 100%;
    margin: 0.75rem 0 1.4rem;
    padding: 1.3rem 0;
    border-top: 0.0625rem solid rgba(255, 255, 255, 0.1);
    border-bottom: 0.0625rem solid rgba(255, 255, 255, 0.1);
}

.friend-links-title {
    margin: 0 0 1rem;
    color: #ffffff;
    font-size: 1.08rem;
}

.footer-divider {
    width: 100%;
    height: 0.0625rem;
    margin: 0 0 1.2rem;
    background: rgba(255, 255, 255, 0.1);
}

.footer-copyright {
    max-width: 58rem;
    font-size: 0.9rem;
    line-height: 1.8;
}

.footer-copyright p {
    margin: 0.2rem 0;
}

.footer-copyright a {
    color: var(--primary-softer);
}

.footer-copyright a:hover,
.footer-copyright a:focus-visible {
    color: #ffffff;
}

.footer-copyright a:active {
    color: var(--primary-softer);
}

.breadcrumb {
    width: 100%;
    margin: 0 0 1.75rem;
    padding: 0.8rem 1rem;
    color: var(--text-light);
    background: var(--bg-light);
    border: 0.0625rem solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9rem;
}

.breadcrumb-list {
    display: flex;
    min-width: 0;
    align-items: center;
    gap: 0.65rem;
    margin: 0;
    padding: 0;
    list-style: none;
    overflow: hidden;
}

.breadcrumb-item {
    display: inline-flex;
    min-width: 0;
    align-items: center;
    gap: 0.65rem;
    white-space: nowrap;
}

.breadcrumb-item:not(:last-child)::after {
    content: "/";
    color: var(--text-light);
    opacity: 0.7;
}

.breadcrumb-item:last-child {
    flex: 1 1 auto;
}

.breadcrumb-item:last-child span {
    display: block;
    min-width: 0;
    overflow: hidden;
    color: var(--text-medium);
    font-weight: 600;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.breadcrumb-link {
    color: var(--text-medium);
}

.breadcrumb-link:hover,
.breadcrumb-link:focus-visible {
    color: var(--primary);
}

.breadcrumb-link:active {
    color: var(--primary-dark);
}

.page-header {
    margin-bottom: 2.5rem;
    text-align: center;
}

.page-title {
    margin: 0 0 0.8rem;
    color: var(--text-dark);
    font-size: clamp(1.8rem, 2.6vw, 2.65rem);
    line-height: 1.25;
}

.page-description {
    max-width: 64rem;
    margin: 0 auto;
    color: var(--text-medium);
    font-size: 1.03rem;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem 1.5rem;
    color: var(--text-light);
    font-size: 0.92rem;
}

.article-item .article-meta {
    margin-bottom: 0.9rem;
}

.meta-item {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    min-width: 0;
}

.meta-item i {
    color: var(--primary-softer);
}

.article-detail {
    width: 100%;
    padding: clamp(1.3rem, 2.6vw, 3rem);
}

.article-detail:hover {
    transform: none;
}

.article-detail::before {
    transform: scaleX(1);
}

.article-header {
    max-width: 78rem;
    margin: 0 auto 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 0.0625rem solid var(--border);
    text-align: center;
}

.article-main-title {
    margin: 0 auto 1.1rem;
    color: var(--text-dark);
    font-size: clamp(1.9rem, 3vw, 3rem);
    line-height: 1.3;
    overflow-wrap: break-word;
}

.article-detail .article-meta {
    justify-content: center;
}

.article-summary {
    max-width: 68rem;
    margin: 1.8rem auto 0;
    padding: 1.15rem 1.35rem;
    color: var(--text-medium);
    background: var(--bg-blue-light);
    border-left: 0.25rem solid var(--primary);
    border-radius: 0 var(--radius) var(--radius) 0;
    text-align: left;
}

.summary-title {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    margin-bottom: 0.65rem;
    color: var(--primary-dark);
    font-weight: 650;
}

.summary-content {
    overflow-wrap: break-word;
}

.summary-content p {
    margin: 0;
}

.article-navigation {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
    max-width: 78rem;
    margin: 3rem auto 0;
    padding-top: 1.4rem;
    border-top: 0.0625rem solid var(--border);
}

.nav-prev,
.nav-next {
    min-width: 0;
}

.nav-next {
    text-align: right;
}

.nav-link {
    position: relative;
    display: block;
    min-height: 5rem;
    padding: 0.9rem 1rem;
    color: var(--text-dark);
    background: var(--bg-light);
    border: 0.0625rem solid transparent;
    border-radius: var(--radius);
    overflow: hidden;
}

.nav-link:hover,
.nav-link:focus-visible {
    color: var(--primary);
    background: var(--primary-light);
    border-color: rgba(22, 93, 255, 0.22);
    box-shadow: 0 0.25rem 0.8rem rgba(22, 93, 255, 0.09);
}

.nav-link:active {
    color: var(--primary-dark);
    background: #dceaff;
}

.nav-link-disabled {
    color: var(--text-light);
    cursor: not-allowed;
    opacity: 0.68;
}

.nav-label,
.nav-title {
    display: block;
}

.nav-label {
    margin-bottom: 0.25rem;
    color: var(--text-light);
    font-size: 0.84rem;
}

.nav-title {
    overflow: hidden;
    font-weight: 550;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.pagination,
.pagination ul,
.pagination ol,
ul.pagination,
ol.pagination,
ul.page,
ol.page {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    margin: 3rem auto 0;
    padding: 0;
    list-style: none;
}

.pagination li,
ul.pagination li,
ol.pagination li,
ul.page li,
ol.page li {
    margin: 0;
    padding: 0;
    list-style: none;
}

.pagination a,
.pagination span,
ul.pagination a,
ul.pagination span,
ol.pagination a,
ol.pagination span,
ul.page a,
ul.page span,
ol.page a,
ol.page span {
    display: inline-flex;
    min-width: 2.7rem;
    min-height: 2.7rem;
    align-items: center;
    justify-content: center;
    padding: 0.55rem 0.8rem;
    color: var(--text-medium);
    background: var(--bg-white);
    border: 0.0625rem solid var(--border);
    border-radius: var(--radius);
    line-height: 1;
}

.pagination a:hover,
.pagination a:focus-visible,
ul.pagination a:hover,
ul.pagination a:focus-visible,
ol.pagination a:hover,
ol.pagination a:focus-visible,
ul.page a:hover,
ul.page a:focus-visible,
ol.page a:hover,
ol.page a:focus-visible {
    color: var(--primary);
    background: var(--primary-light);
    border-color: rgba(22, 93, 255, 0.3);
}

.pagination a:active,
ul.pagination a:active,
ol.pagination a:active,
ul.page a:active,
ol.page a:active {
    color: #ffffff;
    background: var(--primary-dark);
}

.pagination .active,
.pagination .current,
.pagination .curpage,
.pagination .page-current,
ul.pagination .active,
ul.pagination .current,
ul.page .active,
ul.page .current {
    color: #ffffff;
    background: var(--primary);
    border-color: var(--primary);
    font-weight: 650;
}

.pagination .disabled,
.pagination .nopage,
.pagination .page-disabled,
.pagination [aria-disabled="true"],
ul.pagination .disabled,
ul.page .disabled {
    color: var(--text-light);
    background: var(--bg-light);
    border-color: var(--border);
    cursor: not-allowed;
    opacity: 0.6;
    pointer-events: none;
}

.pagination .pageinfo,
.pagination .page-info,
.pagination .page-total {
    min-width: auto;
    color: var(--text-light);
    background: transparent;
    border-color: transparent;
}

.article-body {
    width: 100%;
    max-width: 78rem;
    margin: 0 auto;
    color: var(--text-dark);
    font-size: 1.02rem;
    line-height: 1.85;
    overflow-wrap: break-word;
    word-break: normal;
}

.article-body > :first-child {
    margin-top: 0;
}

.article-body > :last-child {
    margin-bottom: 0;
}

.article-body p {
    margin: 0 0 1.3rem;
    color: var(--text-dark);
}

.article-body h1,
.article-body h2,
.article-body h3,
.article-body h4,
.article-body h5,
.article-body h6 {
    max-width: 100%;
    margin: 2rem 0 0.8rem;
    color: var(--text-dark);
    font-weight: 700;
    line-height: 1.35;
    overflow-wrap: break-word;
}

.article-body h1 {
    font-size: clamp(1.75rem, 2.7vw, 2.45rem);
}

.article-body h2 {
    font-size: clamp(1.5rem, 2.2vw, 2rem);
}

.article-body h3 {
    font-size: clamp(1.28rem, 1.8vw, 1.65rem);
}

.article-body h4 {
    font-size: 1.18rem;
}

.article-body h5 {
    font-size: 1.06rem;
}

.article-body h6 {
    color: var(--text-medium);
    font-size: 0.96rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.article-body strong {
    color: var(--text-dark);
    font-weight: 750;
}

.article-body em {
    font-style: italic;
}

.article-body mark {
    padding: 0.08em 0.25em;
    color: inherit;
    background: #fff3bf;
    border-radius: 0.2rem;
}

.article-body ul,
.article-body ol {
    margin: 0 0 1.4rem 1.2rem;
    padding-left: 1.2rem;
}

.article-body ul {
    list-style: disc;
}

.article-body ol {
    list-style: decimal;
}

.article-body li {
    margin: 0.4rem 0;
    padding-left: 0.15rem;
}

.article-body li > ul,
.article-body li > ol {
    margin-top: 0.4rem;
    margin-bottom: 0.4rem;
}

.article-body a {
    color: var(--primary);
    text-decoration: underline;
    text-decoration-thickness: 0.08em;
    text-underline-offset: 0.18em;
    overflow-wrap: anywhere;
}

.article-body a:hover,
.article-body a:focus-visible {
    color: var(--primary-dark);
}

.article-body a:active {
    color: #0b36aa;
}

.article-body a[aria-disabled="true"],
.article-body a.disabled {
    color: var(--text-light);
    text-decoration: none;
}

.article-body img {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 1.5rem auto;
    border-radius: var(--radius);
}

.article-body figure {
    max-width: 100%;
    margin: 1.8rem 0;
}

.article-body figure img {
    margin: 0 auto;
}

.article-body figcaption {
    margin-top: 0.65rem;
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.6;
    text-align: center;
}

.article-body table {
    display: block;
    width: 100%;
    max-width: 100%;
    margin: 1.7rem 0;
    border-collapse: collapse;
    border-spacing: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.article-body caption {
    margin-bottom: 0.7rem;
    color: var(--text-medium);
    font-weight: 650;
    text-align: left;
}

.article-body thead {
    background: var(--bg-light);
}

.article-body tbody {
    background: var(--bg-white);
}

.article-body th,
.article-body td {
    min-width: 8rem;
    padding: 0.8rem 0.95rem;
    border: 0.0625rem solid var(--border);
    vertical-align: top;
    text-align: left;
}

.article-body th {
    color: var(--text-dark);
    font-weight: 700;
}

.article-body blockquote {
    margin: 1.7rem 0;
    padding: 1rem 1.2rem;
    color: var(--text-medium);
    background: var(--bg-blue-light);
    border-left: 0.25rem solid var(--primary);
    border-radius: 0 var(--radius) var(--radius) 0;
}

.article-body blockquote p {
    margin-bottom: 0.8rem;
}

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

.article-body cite {
    display: block;
    margin-top: 0.75rem;
    color: var(--text-light);
    font-size: 0.9rem;
    font-style: normal;
}

.article-body code {
    padding: 0.12em 0.35em;
    color: #b42318;
    background: var(--bg-light);
    border-radius: 0.25rem;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    font-size: 0.92em;
    overflow-wrap: anywhere;
}

.article-body pre {
    max-width: 100%;
    margin: 1.7rem 0;
    padding: 1rem 1.15rem;
    color: var(--text-dark);
    background: var(--bg-light);
    border: 0.0625rem solid var(--border);
    border-radius: var(--radius);
    line-height: 1.7;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.article-body pre code {
    display: block;
    min-width: max-content;
    padding: 0;
    color: inherit;
    background: transparent;
}

.article-body kbd {
    display: inline-block;
    padding: 0.2rem 0.4rem;
    color: var(--text-dark);
    background: var(--bg-white);
    border: 0.0625rem solid var(--border);
    border-bottom-width: 0.15rem;
    border-radius: 0.3rem;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    font-size: 0.85em;
    line-height: 1;
}

.article-body details {
    margin: 1.4rem 0;
    padding: 1rem 1.1rem;
    background: var(--bg-white);
    border: 0.0625rem solid var(--border);
    border-radius: var(--radius);
}

.article-body summary {
    cursor: pointer;
    color: var(--text-dark);
    font-weight: 700;
}

.article-body details[open] summary {
    margin-bottom: 0.8rem;
}

.article-body abbr[title] {
    cursor: help;
    text-decoration: underline dotted;
    text-underline-offset: 0.18em;
}

.article-body time {
    color: var(--text-medium);
    font-variant-numeric: tabular-nums;
}

@media (min-width: 64rem) {
    .article-list-page {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 63.9375rem) {
    .features-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

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

    .hero-container {
        grid-template-columns: 1fr;
    }

    .hero-content,
    .hero-image {
        max-width: 46rem;
        margin-inline: auto;
    }

    .hero-content {
        text-align: center;
    }

    .hero-feature {
        justify-content: center;
        text-align: left;
    }

    .hero-buttons {
        justify-content: center;
    }
}

@media (max-width: 47.9375rem) {
    :root {
        --header-height: 4.5rem;
    }

    .container {
        width: min(calc(100% - 1.25rem), var(--container-max));
    }

    .header-container {
        min-height: var(--header-height);
    }

    .logo {
        max-width: calc(100% - 4rem);
        font-size: 1.08rem;
    }

    .logo span {
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .nav-toggle {
        display: inline-flex;
        flex: 0 0 auto;
    }

    body.nav-open::before {
        content: "";
        position: fixed;
        inset: var(--header-height) 0 0;
        z-index: 999;
        background: rgba(29, 33, 41, 0.2);
        pointer-events: none;
    }

    .main-navigation {
        position: fixed;
        inset: var(--header-height) 0 0;
        z-index: 1001;
        display: grid;
        width: 100%;
        height: calc(100dvh - var(--header-height));
        padding:
            clamp(0.85rem, 3vw, 1.5rem)
            max(0.85rem, env(safe-area-inset-right))
            max(1rem, env(safe-area-inset-bottom))
            max(0.85rem, env(safe-area-inset-left));
        scrollbar-gutter: stable;
        visibility: hidden;
        opacity: 0;
        background: rgba(240, 245, 255, 0.72);
        border-top: 0.0625rem solid rgba(255, 255, 255, 0.78);
        box-shadow: 0 -0.1rem 1.5rem rgba(29, 33, 41, 0.08) inset;
        -webkit-backdrop-filter: blur(1rem) saturate(145%);
        backdrop-filter: blur(1rem) saturate(145%);
        overflow-y: auto;
        overscroll-behavior: contain;
        transform: translateY(-0.5rem);
        transform-origin: top center;
        transition:
            opacity 0.2s ease,
            transform 0.2s ease,
            visibility 0.2s ease;
    }

    .main-navigation.is-open {
        visibility: visible;
        opacity: 1;
        transform: translateY(0);
    }

    .dnf-nav-list {
        display: grid;
        grid-template-columns: minmax(0, 1fr);
        gap: clamp(0.6rem, 1.35vh, 1rem);
        align-self: safe center;
        justify-self: center;
        width: min(100%, 28rem);
        margin: 0;
        padding: clamp(0.75rem, 2vh, 1.2rem);
        background: rgba(255, 255, 255, 0.56);
        border: 0.0625rem solid rgba(255, 255, 255, 0.78);
        border-radius: 1rem;
        box-shadow:
            0 1rem 2.75rem rgba(29, 33, 41, 0.12),
            0 0 0 0.0625rem rgba(22, 93, 255, 0.05) inset;
        -webkit-backdrop-filter: blur(0.75rem);
        backdrop-filter: blur(0.75rem);
    }

    .dnf-nav-list li {
        min-width: 0;
    }

    .dnf-nav-link {
        width: 100%;
        min-height: clamp(2.8rem, 6vh, 3.35rem);
        justify-content: center;
        padding: 0.72rem 1rem;
        color: var(--text-medium);
        background: rgba(255, 255, 255, 0.82);
        border: 0.0625rem solid rgba(22, 93, 255, 0.08);
        border-radius: 0.72rem;
        box-shadow: 0 0.18rem 0.45rem rgba(29, 33, 41, 0.04);
        font-size: clamp(0.94rem, 3.6vw, 1rem);
        font-weight: 600;
        line-height: 1.3;
        text-align: center;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .dnf-nav-link::after {
        display: none;
    }

    .dnf-nav-link:hover,
    .dnf-nav-link:focus-visible {
        color: var(--primary);
        background: var(--primary-light);
        border-color: rgba(22, 93, 255, 0.2);
        transform: translateY(-0.0625rem);
    }

    .dnf-nav-link.is-current {
        color: #ffffff;
        background: linear-gradient(135deg, var(--primary), var(--primary-dark));
        border-color: transparent;
        box-shadow: 0 0.35rem 0.9rem rgba(22, 93, 255, 0.24);
    }

    .dnf-nav-link:active {
        transform: translateY(0);
    }

    .section-hero,
    .section-features,
    .section-functions,
    .section-efficiency,
    .section-faq,
    .section-articles {
        padding-block: 3.25rem;
    }

    .section-hero {
        padding-block: 2.25rem 3rem;
    }

    .hero-container {
        gap: 1.4rem;
    }

    .hero-content {
        width: 100%;
        max-width: 34rem;
        padding: 1.2rem;
        color: #ffffff;
        text-align: left;
        background: rgba(255, 255, 255, 0.1);
        border: 0.0625rem solid rgba(255, 255, 255, 0.2);
        border-radius: 1rem;
        box-shadow: 0 1rem 2.5rem rgba(14, 66, 204, 0.22);
        backdrop-filter: blur(0.45rem);
    }

    .hero-title {
        margin-bottom: 0.7rem;
        font-size: clamp(1.7rem, 7.4vw, 2.2rem);
        line-height: 1.25;
        letter-spacing: -0.015em;
        text-align: center;
        text-wrap: balance;
    }

    .hero-subtitle {
        max-width: 29rem;
        margin: 0 auto;
        font-size: 0.96rem;
        line-height: 1.65;
        text-align: center;
        opacity: 0.92;
    }

    .hero-features {
        gap: 0.55rem;
        margin: 1.1rem 0 1.2rem;
        padding: 0.7rem;
        background: rgba(255, 255, 255, 0.07);
        border: 0.0625rem solid rgba(255, 255, 255, 0.12);
        border-radius: 0.8rem;
    }

    .hero-feature {
        justify-content: flex-start;
        gap: 0.65rem;
        min-height: 2.75rem;
        padding: 0.55rem 0.65rem;
        font-size: 0.9rem;
        line-height: 1.5;
        text-align: left;
        background: rgba(255, 255, 255, 0.07);
        border-radius: 0.6rem;
    }

    .hero-feature i {
        display: inline-flex;
        flex: 0 0 1.55rem;
        align-items: center;
        justify-content: center;
        width: 1.55rem;
        height: 1.55rem;
        margin-top: 0.05rem;
        color: #ffffff;
        background: rgba(64, 207, 255, 0.22);
        border-radius: 50%;
    }

    .hero-buttons {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 0.65rem;
    }

    .hero-buttons .btn {
        width: 100%;
        min-height: 2.9rem;
        padding: 0.7rem 0.75rem;
        border-radius: 0.7rem;
        font-size: 0.92rem;
    }

    .hero-buttons .btn:first-child {
        grid-column: 1 / -1;
    }

    .hero-image {
        width: 100%;
        max-width: 34rem;
    }

    .hero-image img {
        border-radius: 0.9rem;
        box-shadow: 0 0.9rem 2.2rem rgba(20, 30, 80, 0.24);
    }

    .features-grid,
    .functions-grid,
    .efficiency-grid {
        grid-template-columns: 1fr;
    }

    .function-item {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .faq-item summary {
        min-height: 4rem;
        padding: 1rem;
        font-size: 0.98rem;
    }

    .faq-answer {
        padding: 0 1rem 1rem;
    }

    .dnf-footer-nav-links,
    .dnf-friend-nav-list {
        gap: 0.65rem 1.1rem;
    }

    .breadcrumb {
        margin-bottom: 1.25rem;
        padding: 0.75rem 0.85rem;
        background: linear-gradient(135deg, #f8fbff, var(--bg-blue-light));
        border-color: rgba(22, 93, 255, 0.14);
        border-radius: 0.75rem;
        box-shadow: 0 0.2rem 0.7rem rgba(22, 93, 255, 0.06);
        font-size: 0.84rem;
    }

    .breadcrumb-list {
        flex-wrap: wrap;
        gap: 0.35rem 0.5rem;
        overflow: visible;
    }

    .breadcrumb-item {
        gap: 0.5rem;
    }

    .breadcrumb-item:nth-last-child(2)::after {
        display: none;
    }

    .breadcrumb-item:last-child {
        flex: 1 0 100%;
        margin-top: 0.15rem;
        padding-top: 0.5rem;
        border-top: 0.0625rem solid rgba(22, 93, 255, 0.12);
    }

    .breadcrumb-item:last-child span {
        display: -webkit-box;
        overflow: hidden;
        line-height: 1.45;
        white-space: normal;
        -webkit-box-orient: vertical;
        -webkit-line-clamp: 2;
    }

    .page-header {
        margin-bottom: 1.8rem;
    }

    .page-description {
        font-size: 0.96rem;
    }

    .article-detail {
        padding: 1rem;
    }

    .article-header {
        margin-bottom: 1.8rem;
        padding-bottom: 1rem;
    }

    .article-main-title {
        font-size: clamp(1.55rem, 7vw, 2rem);
    }

    .article-detail .article-meta {
        justify-content: flex-start;
        gap: 0.55rem 1rem;
        text-align: left;
    }

    .article-summary {
        margin-top: 1.25rem;
        padding: 1rem;
    }

    .article-navigation {
        grid-template-columns: 1fr;
        margin-top: 2rem;
    }

    .nav-next {
        text-align: left;
    }

    .pagination,
    .pagination ul,
    .pagination ol,
    ul.pagination,
    ol.pagination,
    ul.page,
    ol.page {
        gap: 0.3rem;
        margin-top: 2rem;
    }

    .pagination a,
    .pagination span,
    ul.pagination a,
    ul.pagination span,
    ol.pagination a,
    ol.pagination span,
    ul.page a,
    ul.page span,
    ol.page a,
    ol.page span {
        min-width: 2.4rem;
        min-height: 2.4rem;
        padding: 0.45rem 0.62rem;
        font-size: 0.88rem;
    }

    .article-body {
        font-size: 1rem;
        line-height: 1.8;
    }

    .article-body ul,
    .article-body ol {
        margin-left: 0.8rem;
        padding-left: 1rem;
    }

    .article-body th,
    .article-body td {
        min-width: 7.5rem;
        padding: 0.7rem 0.8rem;
    }
}

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

    *,
    *::before,
    *::after {
        transition-duration: 0.01ms;
        transition-delay: 0ms;
    }
}

@media (max-width: 47.9375rem) and (max-height: 42rem) {
    .main-navigation {
        padding-block: 0.7rem max(0.85rem, env(safe-area-inset-bottom));
    }

    .dnf-nav-list {
        gap: 0.45rem;
        align-self: start;
        padding: 0.65rem;
    }

    .dnf-nav-link {
        min-height: 2.65rem;
        padding-block: 0.6rem;
    }
}

@media (max-width: 22.5rem) {
    .hero-content {
        padding: 1rem;
    }

    .hero-buttons {
        grid-template-columns: 1fr;
    }

    .hero-buttons .btn:first-child {
        grid-column: auto;
    }

    .main-navigation {
        padding:
            0.65rem
            max(0.65rem, env(safe-area-inset-right))
            max(0.85rem, env(safe-area-inset-bottom))
            max(0.65rem, env(safe-area-inset-left));
    }

    .dnf-nav-list {
        gap: 0.42rem;
        padding: 0.6rem;
        border-radius: 0.85rem;
    }

    .dnf-nav-link {
        min-height: 2.6rem;
        padding-inline: 0.7rem;
        font-size: 0.92rem;
    }
}