:root {
    --color-primary: #b30d16;
    --color-primary-light: #d4343d;
    --color-primary-dark: #8a0a11;
    --color-ink: #2c2c2c;
    --color-ink-light: #5a5a5a;
    --color-ink-lighter: #8a8a8a;
    --color-bg: #faf8f5;
    --color-bg-warm: #f5f0ea;
    --color-bg-cream: #f0ebe3;
    --color-bg-dark: #e8e0d4;
    --color-gold: #c4a35a;
    --color-gold-light: #d4bc7a;
    --color-jade: #6b8e7b;
    --color-jade-light: #8fb39f;
    --color-white: #ffffff;
    --color-border: rgba(44, 44, 44, 0.08);
    --font-serif: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
    --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --ease-smooth: cubic-bezier(0.25, 0.1, 0.25, 1);
    --ease-out: cubic-bezier(0.0, 0.0, 0.2, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --shadow-soft: 0 2px 20px rgba(0, 0, 0, 0.04);
    --shadow-medium: 0 4px 30px rgba(0, 0, 0, 0.06);
    --shadow-elevated: 0 8px 40px rgba(0, 0, 0, 0.08);
}

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    color: var(--color-ink);
    background-color: var(--color-bg);
    line-height: 1.8;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

.section {
    padding: 80px 0;
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.section-header {
    text-align: center;
    margin-bottom: 100px;
}

.section-tag {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    color: var(--color-primary);
    background: rgba(179, 13, 22, 0.06);
    padding: 6px 20px;
    border-radius: 20px;
    margin-bottom: 20px;
}

.section-title {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    font-weight: 600;
    color: var(--color-ink);
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.section-divider {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.section-divider span {
    display: block;
    width: 40px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
}

.section-desc {
    font-size: 1rem;
    color: var(--color-ink-light);
    max-width: 680px;
    margin: 0 auto;
    line-height: 1.9;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: all 0.4s var(--ease-smooth);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(250, 248, 245, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 10px 0;
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.05);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--color-ink);
}

.nav-logo-img {
    width: 150px;
    height: auto;
    transition: transform 0.3s var(--ease-smooth);
}

.nav-logo:hover .nav-logo-img {
    transform: scale(1.03);
}

.nav-brand {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    color: var(--color-primary);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
}

.nav-menu a {
    text-decoration: none;
    color: var(--color-ink-light);
    font-size: 0.88rem;
    font-weight: 400;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    transition: all 0.3s var(--ease-smooth);
    letter-spacing: 0.03em;
}

.nav-menu a:hover {
    color: var(--color-primary);
    background: rgba(179, 13, 22, 0.05);
}

.nav-cta {
    background: var(--color-primary) !important;
    color: var(--color-white) !important;
    font-weight: 500 !important;
    padding: 8px 24px !important;
}

.nav-cta:hover {
    background: var(--color-primary-dark) !important;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-ink);
    border-radius: 1px;
    transition: all 0.3s var(--ease-smooth);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-warm) 50%, var(--color-bg-cream) 100%);
    overflow: hidden;
}

.hero-bg-elements {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.ink-wash {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.2;
    will-change: transform;
}

.ink-wash-1 {
    width: 650px;
    height: 650px;
    background: var(--color-primary);
    top: -220px;
    right: -120px;
}

.ink-wash-2 {
    width: 450px;
    height: 450px;
    background: var(--color-jade);
    bottom: -120px;
    left: -120px;
}

.ink-wash-3 {
    width: 380px;
    height: 380px;
    background: var(--color-gold);
    top: 35%;
    left: 45%;
}

@keyframes float1 {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(40px, -30px) scale(1.08); }
    100% { transform: translate(0, 0) scale(1); }
}

@keyframes float2 {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(-30px, 25px) scale(1.06); }
    100% { transform: translate(0, 0) scale(1); }
}

@keyframes float3 {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(25px, 30px) scale(1.05); }
    100% { transform: translate(0, 0) scale(1); }
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
    padding: 0 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    animation: fadeInUp 1.2s var(--ease-out) both;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: 4rem;
    font-weight: 900;
    color: var(--color-primary);
    letter-spacing: 0.15em;
    margin-bottom: 24px;
    text-shadow: 0 2px 30px rgba(179, 13, 22, 0.1);
}

.hero-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 28px;
}

.divider-line {
    width: 60px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
}

.divider-dot {
    width: 6px;
    height: 6px;
    background: var(--color-primary);
    border-radius: 50%;
}

.hero-slogan {
    font-family: var(--font-serif);
    font-size: 1.6rem;
    font-weight: 400;
    color: var(--color-ink);
    letter-spacing: 0.3em;
    margin-bottom: 60px;
}

.hero-scroll-hint {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--color-ink-lighter);
    opacity: 0.6;
    text-decoration: none;
    cursor: pointer;
    margin-top: 120px;
}

.hero-scroll-hint:hover {
    opacity: 1;
    color: var(--color-ink-light);
}

.scroll-text {
    font-size: 0.75rem;
    letter-spacing: 0.15em;
}

.scroll-arrow {
    animation: bounceDown 2s ease-in-out infinite;
}

@keyframes bounceDown {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(6px); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.about {
    background: var(--color-white);
    padding: 120px 0;
}

.about-lead {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    line-height: 2.2;
    color: var(--color-ink);
    max-width: 860px;
    margin: 0 auto;
    text-align: justify;
    text-justify: inter-ideograph;
    padding: 0 20px;
    word-break: keep-all;
    overflow-wrap: break-word;
}

.about-lead strong {
    font-weight: 400;
}

.about-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 56px;
}

.about-card {
    padding: 40px 32px;
    border-radius: var(--radius-lg);
    background: var(--color-bg);
    text-align: center;
    transition: all 0.4s var(--ease-smooth);
    border: 1px solid var(--color-border);
}

.about-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-elevated);
    border-color: rgba(179, 13, 22, 0.1);
}

.about-card-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    color: var(--color-primary);
}

.about-card-icon svg {
    width: 100%;
    height: 100%;
}

.about-card h3 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: 12px;
    letter-spacing: 0.08em;
}

.about-card p {
    font-size: 0.92rem;
    color: var(--color-ink-light);
    line-height: 1.8;
}

.platform {
    background: var(--color-bg-warm);
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
    margin-bottom: 64px;
}

.platform-card {
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    background: var(--color-white);
    border: 1px solid var(--color-border);
    transition: all 0.4s var(--ease-smooth);
    position: relative;
    overflow: hidden;
}

.platform-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-gold));
    opacity: 0;
    transition: opacity 0.4s var(--ease-smooth);
}

.platform-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-elevated);
}

.platform-card:hover::before {
    opacity: 1;
}

.platform-card-num {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 200;
    color: var(--color-primary);
    opacity: 0.3;
    margin-bottom: 16px;
    letter-spacing: 0.05em;
}

.platform-card h3 {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: 10px;
    letter-spacing: 0.05em;
}

.platform-card p {
    font-size: 0.88rem;
    color: var(--color-ink-light);
    line-height: 1.8;
}

.service-centers {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: 48px;
    border: 1px solid var(--color-border);
}

.centers-title {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    font-weight: 600;
    text-align: center;
    color: var(--color-ink);
    margin-bottom: 32px;
    letter-spacing: 0.1em;
}

.centers-scroll-wrapper {
    overflow: hidden;
    position: relative;
    mask-image: linear-gradient(to right, transparent, black 3%, black 97%, transparent);
    -webkit-mask-image: linear-gradient(to right, transparent, black 3%, black 97%, transparent);
}

.centers-scroll-wrapper:hover .centers-scroll-track {
    animation-play-state: paused;
}

.centers-scroll-track {
    display: flex;
    gap: 12px;
    animation: scrollLeftInfinite 60s linear infinite;
    width: max-content;
}

.center-item {
    display: inline-block;
    padding: 8px 20px;
    background: var(--color-bg);
    border-radius: 20px;
    font-size: 0.88rem;
    color: var(--color-ink-light);
    border: 1px solid var(--color-border);
    transition: all 0.3s var(--ease-smooth);
    white-space: nowrap;
    flex-shrink: 0;
}

.center-item:hover {
    color: var(--color-primary);
    border-color: rgba(179, 13, 22, 0.2);
    background: rgba(179, 13, 22, 0.03);
}

@keyframes scrollLeftInfinite {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

.advantage {
    background: var(--color-white);
}

.advantage-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.advantage-card {
    padding: 44px 36px;
    border-radius: var(--radius-lg);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    transition: all 0.4s var(--ease-smooth);
    position: relative;
}

.advantage-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-elevated);
    border-color: rgba(179, 13, 22, 0.1);
}

.advantage-icon {
    width: 52px;
    height: 52px;
    margin-bottom: 20px;
    color: var(--color-primary);
}

.advantage-icon svg {
    width: 100%;
    height: 100%;
}

.advantage-card h3 {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: 12px;
    letter-spacing: 0.05em;
}

.advantage-card p {
    font-size: 0.92rem;
    color: var(--color-ink-light);
    line-height: 1.9;
}

.quality {
    background: var(--color-bg-warm);
}

.quality-content {
    max-width: 800px;
    margin: 0 auto;
}

.quality-main {
    display: flex;
    align-items: flex-start;
    gap: 48px;
    margin-bottom: 48px;
}

.quality-seal {
    flex-shrink: 0;
}

.seal-inner {
    width: 120px;
    height: 120px;
    border: 3px solid var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.seal-inner::before {
    content: '';
    position: absolute;
    inset: 6px;
    border: 1px solid var(--color-primary);
    border-radius: 50%;
    opacity: 0.4;
}

.seal-text {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-primary);
    text-align: center;
    letter-spacing: 0.1em;
    line-height: 1.5;
}

.quality-points {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.quality-point {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.quality-point-marker {
    flex-shrink: 0;
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
    margin-top: 10px;
    position: relative;
}

.quality-point-marker::after {
    content: '';
    position: absolute;
    inset: -4px;
    border: 1px solid var(--color-primary);
    border-radius: 50%;
    opacity: 0.2;
}

.quality-point p {
    font-size: 1rem;
    color: var(--color-ink);
    line-height: 1.9;
}

.quality-pledge {
    text-align: center;
    padding: 40px 56px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.quality-pledge p {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    color: var(--color-ink);
    font-weight: 500;
    letter-spacing: 0.05em;
    line-height: 2;
    word-break: keep-all;
    overflow-wrap: break-word;
}

.honor {
    background: var(--color-bg-cream);
    padding: 80px 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.honor-content {
    display: flex;
    align-items: center;
    gap: 64px;
    max-width: 900px;
    margin: 0 auto;
}

.honor-number {
    flex-shrink: 0;
    text-align: center;
}

.honor-num {
    font-family: var(--font-serif);
    font-size: 6rem;
    font-weight: 200;
    color: var(--color-primary);
    line-height: 1;
    display: block;
    letter-spacing: -0.02em;
}

.honor-label {
    font-size: 0.85rem;
    color: var(--color-ink-lighter);
    letter-spacing: 0.25em;
    margin-top: 8px;
    display: block;
    text-transform: uppercase;
}

.honor-text h2 {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
    color: var(--color-ink);
}

.honor-text p {
    font-size: 1rem;
    color: var(--color-ink-light);
    line-height: 1.9;
}

.portfolio {
    background: var(--color-bg-warm);
}

.portfolio-category {
    margin-bottom: 48px;
}

.portfolio-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 40px;
}

.portfolio-tab {
    padding: 8px 22px;
    border: 1px solid var(--color-border);
    border-radius: 24px;
    background: var(--color-white);
    color: var(--color-ink-light);
    font-family: var(--font-sans);
    font-size: 0.88rem;
    cursor: pointer;
    transition: all 0.3s var(--ease-smooth);
    letter-spacing: 0.03em;
}

.portfolio-tab:hover {
    color: var(--color-primary);
    border-color: rgba(179, 13, 22, 0.3);
}

.portfolio-tab.active {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.portfolio-panels {
    position: relative;
}

.portfolio-panel {
    display: none;
    animation: fadeInPanel 0.5s var(--ease-out);
}

.portfolio-panel.active {
    display: block;
}

@keyframes fadeInPanel {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.portfolio-images {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 16px;
}

.portfolio-img-item {
    aspect-ratio: 3 / 4;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-bg-cream);
    border: 1px solid var(--color-border);
    transition: all 0.4s var(--ease-smooth);
}

.portfolio-img-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

.portfolio-img-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s var(--ease-smooth);
}

.portfolio-img-item:hover img {
    transform: scale(1.05);
}

.portfolio-img-item.img-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-cream) 100%);
}

.portfolio-img-item.img-placeholder::before {
    content: attr(data-category);
    font-size: 0.7rem;
    color: var(--color-ink-lighter);
    letter-spacing: 0.1em;
    text-align: center;
    padding: 8px;
}

.custom {
    background: var(--color-bg-warm);
}

.custom-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.custom-card {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    min-height: 320px;
    transition: all 0.4s var(--ease-smooth);
    cursor: default;
}

.custom-card-bg {
    position: absolute;
    inset: 0;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all 0.4s var(--ease-smooth);
}

.custom-card:hover .custom-card-bg {
    box-shadow: var(--shadow-elevated);
    border-color: rgba(179, 13, 22, 0.15);
}

.custom-card:hover {
    transform: translateY(-4px);
}

.custom-card-content {
    position: relative;
    z-index: 1;
    padding: 48px 36px;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.custom-icon {
    width: 52px;
    height: 52px;
    color: var(--color-primary);
    margin-bottom: 24px;
}

.custom-icon svg {
    width: 100%;
    height: 100%;
}

.custom-card-content h3 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: 12px;
    letter-spacing: 0.05em;
}

.custom-card-content p {
    font-size: 0.92rem;
    color: var(--color-ink-light);
    line-height: 1.8;
}

.cta {
    background: linear-gradient(135deg, var(--color-bg-cream) 0%, var(--color-bg-warm) 100%);
    padding: 100px 0;
}

.cta-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    font-family: var(--font-serif);
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 0.1em;
    margin-bottom: 16px;
}

.cta-content p {
    font-size: 1.05rem;
    color: var(--color-ink-light);
    margin-bottom: 36px;
    letter-spacing: 0.05em;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 40px;
    background: var(--color-primary);
    color: var(--color-white);
    text-decoration: none;
    border-radius: 50px;
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    transition: all 0.4s var(--ease-smooth);
    box-shadow: 0 4px 20px rgba(179, 13, 22, 0.25);
}

.cta-button:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(179, 13, 22, 0.35);
}

.footer {
    background: var(--color-bg);
    color: var(--color-ink-light);
    padding: 64px 0 32px;
    border-top: 1px solid var(--color-border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
    justify-items: center;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-logo {
    width: 200px;
    height: auto;
    object-fit: contain;
    margin-bottom: 12px;
}

.footer-brand h3 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-ink);
    letter-spacing: 0.1em;
}

.footer-brand p {
    font-size: 0.88rem;
    letter-spacing: 0.1em;
    color: var(--color-ink-light);
}

.footer-info h4,
.footer-service h4 {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-ink);
    margin-bottom: 16px;
    letter-spacing: 0.08em;
}

.footer-info p,
.footer-service p {
    font-size: 0.88rem;
    line-height: 1.8;
    color: var(--color-ink-light);
}

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--color-ink-lighter);
    letter-spacing: 0.05em;
}

.footer-bottom a {
    color: var(--color-ink-light);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-bottom a:hover {
    color: var(--color-accent);
}

[data-reveal] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 1024px) {
    .platform-grid {
        grid-template-columns: repeat(3, 1fr);
    }

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

    .section-title {
        font-size: 1.8rem;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 60px 0;
        min-height: 100vh;
    }

    .section-header {
        margin-bottom: 48px;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: rgba(250, 248, 245, 0.96);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: stretch;
        padding: 80px 28px 32px;
        gap: 0;
        transition: right 0.4s var(--ease-smooth);
        box-shadow: -4px 0 40px rgba(0, 0, 0, 0.08);
    }

    .nav-menu.open {
        right: 0;
    }

    .nav-menu li {
        margin-bottom: 4px;
    }

    .nav-menu a {
        display: block;
        padding: 14px 20px;
        font-size: 0.95rem;
        border-radius: var(--radius-sm);
        letter-spacing: 0.06em;
        color: var(--color-ink);
        transition: all 0.3s var(--ease-smooth);
    }

    .nav-menu a:hover {
        background: rgba(179, 13, 22, 0.05);
        color: var(--color-primary);
        padding-left: 24px;
    }

    .nav-menu .nav-cta {
        margin-top: 16px;
        text-align: center;
        border-radius: 24px;
    }

    .hero-title {
        font-size: 2.8rem;
    }

    .hero-slogan {
        font-size: 1.2rem;
        letter-spacing: 0.2em;
    }

    .about-cards {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .platform-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .advantage-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .quality-main {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .quality-point {
        justify-content: center;
    }

    .honor-content {
        flex-direction: column;
        text-align: center;
        gap: 32px;
    }

    .honor-num {
        font-size: 4.5rem;
    }

    .portfolio-images {
        grid-template-columns: repeat(3, 1fr);
        gap: 12px;
    }

    .custom-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .custom-card {
        min-height: auto;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
        justify-items: start;
        max-width: 400px;
        margin: 0 auto 48px;
    }

    .footer-brand {
        align-items: flex-start;
    }

    .service-centers {
        padding: 32px 20px;
    }

    .quality-pledge {
        padding: 28px 24px;
    }

    .cta-content h2 {
        font-size: 1.8rem;
    }

    .centers-scroll-wrapper {
        mask-image: linear-gradient(to right, transparent, black 0%, black 100%, transparent);
        -webkit-mask-image: linear-gradient(to right, transparent, black 0%, black 100%, transparent);
    }

    .center-item {
        font-size: 0.82rem;
        padding: 6px 14px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.2rem;
    }

    .hero-slogan {
        font-size: 1.05rem;
        letter-spacing: 0.2em;
        margin-bottom: 40px;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .portfolio-images {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .portfolio-cat-title {
        font-size: 1.1rem;
    }

    .cta-button {
        padding: 14px 28px;
        font-size: 0.92rem;
    }
}

.back-to-top {
    position: fixed;
    bottom: 36px;
    right: 36px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: rgba(250, 248, 245, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--color-ink-light);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.4s var(--ease-smooth);
    box-shadow: var(--shadow-soft);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    color: var(--color-primary);
    border-color: rgba(179, 13, 22, 0.3);
    box-shadow: var(--shadow-medium);
    transform: translateY(-2px);
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}