/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    font-family: 'Inter', 'Noto Serif SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #1a1a1a;
    background: #fafafa;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: #000;
}

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

button {
    border: none;
    background: none;
    cursor: pointer;
    font: inherit;
    color: inherit;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 32px;
    position: relative;
}

/* ===== Brand Mark ===== */
.brand-mark {
    width: 28px;
    height: 28px;
    border: 2px solid currentColor;
    display: inline-block;
    position: relative;
    flex-shrink: 0;
}

.brand-mark::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 12px;
    height: 12px;
    background: currentColor;
}

/* ===== Header ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 16px 0;
    transition: all 0.3s ease;
    background: rgba(250, 250, 250, 0);
    backdrop-filter: blur(0);
}

.site-header.scrolled {
    background: rgba(250, 250, 250, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    padding: 12px 0;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    letter-spacing: 0.1em;
    font-size: 16px;
}

.nav {
    display: flex;
    align-items: center;
    gap: 32px;
    font-size: 14px;
}

.nav a {
    color: #4a4a4a;
    transition: color 0.2s ease;
    position: relative;
}

.nav a:hover {
    color: #000;
}

.nav a:not(.nav-cta)::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 1px;
    background: currentColor;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.2s ease;
}

.nav a:not(.nav-cta):hover::after {
    transform: scaleX(1);
}

.nav-cta {
    background: #000;
    color: #fff !important;
    padding: 10px 20px;
    border-radius: 999px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.nav-cta:hover {
    background: #1a1a1a;
    transform: translateY(-1px);
}

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

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: #000;
    transition: all 0.2s ease;
}

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(to right, rgba(0, 0, 0, 0.04) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(0, 0, 0, 0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}

.hero-blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
}

.hero-blob-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, #ffe082, transparent);
    top: -100px;
    right: -100px;
}

.hero-blob-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, #b3e5fc, transparent);
    bottom: -50px;
    left: -100px;
}

.hero-inner {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.hero-eyebrow {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 999px;
    font-size: 12px;
    letter-spacing: 0.2em;
    color: #4a4a4a;
    margin-bottom: 32px;
    text-transform: uppercase;
}

.hero-title-cn {
    font-family: 'Noto Serif SC', serif;
    font-size: clamp(56px, 9vw, 100px);
    font-weight: 700;
    line-height: 1.05;
    margin: 0 0 16px;
    letter-spacing: 0.02em;
    color: #000;
}

.hero-title-en {
    font-family: 'Inter', sans-serif;
    font-size: clamp(24px, 3vw, 36px);
    font-weight: 300;
    letter-spacing: 0.4em;
    margin: 0 0 32px;
    color: #4a4a4a;
    text-transform: uppercase;
}

.hero-tagline {
    font-family: 'Noto Serif SC', serif;
    font-size: clamp(20px, 2.4vw, 28px);
    font-weight: 400;
    color: #1a1a1a;
    margin: 0 0 24px;
    letter-spacing: 0.05em;
}

.hero-desc {
    font-size: 16px;
    color: #4a4a4a;
    max-width: 640px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 64px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.2s ease;
    cursor: pointer;
    border: 1px solid transparent;
}

.btn-primary {
    background: #000;
    color: #fff;
}

.btn-primary:hover {
    background: #1a1a1a;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    color: #fff;
}

.btn-ghost {
    background: transparent;
    color: #1a1a1a;
    border-color: rgba(0, 0, 0, 0.15);
}

.btn-ghost:hover {
    border-color: #000;
    background: rgba(0, 0, 0, 0.04);
    color: #000;
}

.hero-meta {
    display: flex;
    justify-content: center;
    gap: 64px;
    flex-wrap: wrap;
    padding-top: 48px;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.hero-meta-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    text-align: center;
}

.hero-meta-item strong {
    font-family: 'Inter', sans-serif;
    font-size: 28px;
    font-weight: 600;
    color: #000;
    letter-spacing: -0.02em;
}

.hero-meta-item span {
    font-size: 13px;
    color: #4a4a4a;
    letter-spacing: 0.05em;
}

.hero-scroll {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 40px;
    border: 2px solid rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    padding-top: 6px;
}

.hero-scroll span {
    width: 2px;
    height: 8px;
    background: #000;
    border-radius: 1px;
    animation: scroll-dot 1.5s ease-in-out infinite;
}

@keyframes scroll-dot {
    0%, 100% { transform: translateY(0); opacity: 1; }
    50% { transform: translateY(8px); opacity: 0.3; }
}

/* ===== Section Common ===== */
.section {
    padding: 120px 0;
    position: relative;
}

.section-head {
    margin-bottom: 64px;
}

.section-num {
    display: inline-block;
    font-family: 'Inter', sans-serif;
    font-size: 13px;
    letter-spacing: 0.2em;
    color: #4a4a4a;
    margin-bottom: 16px;
    font-weight: 500;
}

.section-title {
    font-family: 'Noto Serif SC', serif;
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 600;
    color: #000;
    margin: 0 0 20px;
    line-height: 1.2;
    letter-spacing: 0.02em;
}

.section-divider {
    width: 60px;
    height: 2px;
    background: #000;
}

.section-sub {
    font-size: 16px;
    color: #4a4a4a;
    margin-top: 16px;
    max-width: 640px;
}

/* ===== About ===== */
.about-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 80px;
    align-items: start;
}

.about-text p {
    font-size: 17px;
    color: #1a1a1a;
    margin: 0 0 20px;
    line-height: 1.8;
}

.about-text .about-lead {
    font-size: 22px;
    line-height: 1.6;
    color: #000;
    margin-bottom: 24px;
}

.about-text strong {
    font-weight: 600;
}

.about-card {
    background: #000;
    color: #fff;
    padding: 40px;
    border-radius: 4px;
    position: relative;
}

.about-card-num {
    font-family: 'Inter', sans-serif;
    font-size: 64px;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.1);
    line-height: 1;
    margin-bottom: 16px;
}

.about-card h3 {
    font-family: 'Noto Serif SC', serif;
    font-size: 28px;
    font-weight: 600;
    margin: 0 0 16px;
    letter-spacing: 0.02em;
}

.about-card p {
    font-size: 15px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.7);
    margin: 0;
}

/* ===== Value ===== */
.value-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.value-card {
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.08);
    padding: 40px 32px;
    border-radius: 4px;
    transition: all 0.3s ease;
    position: relative;
}

.value-card:hover {
    transform: translateY(-4px);
    border-color: #000;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
}

.value-card-featured {
    background: #000;
    color: #fff;
    border-color: #000;
}

.value-card-featured:hover {
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.value-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 24px;
    color: #000;
}

.value-card-featured .value-icon {
    color: #fff;
}

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

.value-card h3 {
    font-family: 'Noto Serif SC', serif;
    font-size: 24px;
    font-weight: 600;
    margin: 0 0 16px;
    letter-spacing: 0.02em;
}

.value-card p {
    font-size: 15px;
    color: #4a4a4a;
    line-height: 1.8;
    margin: 0 0 24px;
}

.value-card-featured p {
    color: rgba(255, 255, 255, 0.7);
}

.value-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.value-tags li {
    font-size: 12px;
    padding: 4px 12px;
    border: 1px solid rgba(0, 0, 0, 0.15);
    border-radius: 999px;
    color: #4a4a4a;
}

.value-card-featured .value-tags li {
    border-color: rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.7);
}

/* ===== Content ===== */
.content-feature {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    margin-bottom: 80px;
    padding: 60px;
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 4px;
}

.feature-label {
    display: inline-block;
    font-family: 'Inter', sans-serif;
    font-size: 12px;
    letter-spacing: 0.2em;
    color: #4a4a4a;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.feature-text h3 {
    font-family: 'Noto Serif SC', serif;
    font-size: 36px;
    font-weight: 600;
    line-height: 1.3;
    margin: 0 0 20px;
    letter-spacing: 0.02em;
}

.feature-text > p {
    font-size: 16px;
    color: #4a4a4a;
    line-height: 1.8;
    margin: 0 0 24px;
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.feature-list li {
    font-size: 15px;
    color: #1a1a1a;
    padding-left: 20px;
    position: relative;
}

.feature-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: #000;
    font-weight: 600;
}

.visual-card {
    background: #f5f5f5;
    border: 1px solid rgba(0, 0, 0, 0.08);
    padding: 40px;
    border-radius: 4px;
    aspect-ratio: 4 / 3;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.visual-page {
    font-family: 'Inter', sans-serif;
    font-size: 13px;
    color: #4a4a4a;
    letter-spacing: 0.1em;
}

.visual-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 32px;
    font-weight: 600;
    color: #000;
    margin: 0;
    letter-spacing: 0.02em;
}

.visual-body {
    font-size: 15px;
    color: #4a4a4a;
    line-height: 1.8;
}

.visual-bar {
    width: 100%;
    height: 4px;
    background: rgba(0, 0, 0, 0.08);
    border-radius: 2px;
    overflow: hidden;
}

.visual-bar span {
    display: block;
    height: 100%;
    background: #000;
    border-radius: 2px;
}

.article-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.article-card {
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.08);
    padding: 28px;
    border-radius: 4px;
    transition: all 0.2s ease;
    display: block;
    color: inherit;
}

.article-card:hover {
    transform: translateY(-2px);
    border-color: #000;
    color: inherit;
}

.article-num {
    font-family: 'Inter', sans-serif;
    font-size: 12px;
    letter-spacing: 0.2em;
    color: #4a4a4a;
    font-weight: 500;
}

.article-card h4 {
    font-family: 'Noto Serif SC', serif;
    font-size: 20px;
    font-weight: 600;
    margin: 12px 0 8px;
    color: #000;
    line-height: 1.4;
}

.article-card p {
    font-size: 14px;
    color: #4a4a4a;
    line-height: 1.6;
    margin: 0;
}

/* ===== Follow ===== */
.follow {
    background: #000;
    color: #fff;
}

.follow .section-title {
    color: #fff;
}

.follow .section-num {
    color: rgba(255, 255, 255, 0.5);
}

.follow .section-divider {
    background: #fff;
}

.follow-card {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 80px;
    align-items: center;
    background: #1a1a1a;
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 60px;
    border-radius: 4px;
    margin-top: 40px;
}

.follow-eyebrow {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 999px;
    font-size: 12px;
    letter-spacing: 0.2em;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 24px;
    text-transform: uppercase;
}

.follow-title {
    font-family: 'Noto Serif SC', serif;
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 700;
    line-height: 1.2;
    margin: 0 0 20px;
    color: #fff;
    letter-spacing: 0.02em;
}

.follow-desc {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin: 0 0 32px;
}

.follow-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 32px;
}

.follow-list li {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.9);
    padding-left: 20px;
    position: relative;
}

.follow-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #fff;
    font-weight: 600;
}

.follow-domain {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

.follow-domain-label {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 0.1em;
}

.follow-domain a {
    font-family: 'Inter', sans-serif;
    font-size: 18px;
    font-weight: 500;
    color: #fff;
    letter-spacing: 0.05em;
}

.follow-domain a:hover {
    color: rgba(255, 255, 255, 0.8);
}

.follow-qr {
    text-align: center;
}

.qr-frame {
    display: inline-block;
    background: #fff;
    padding: 24px;
    border-radius: 4px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.qr-frame img {
    width: 280px;
    height: 280px;
    display: block;
}

.qr-tip {
    margin: 20px 0 0;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    letter-spacing: 0.1em;
}

/* ===== Footer ===== */
.site-footer {
    padding: 60px 0 40px;
    background: #fafafa;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    letter-spacing: 0.05em;
}

.footer-meta {
    font-family: 'Noto Serif SC', serif;
    color: #4a4a4a;
    margin: 0;
    font-size: 14px;
}

.footer-copyright {
    margin: 0;
    font-size: 13px;
    color: #4a4a4a;
    width: 100%;
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
    margin-top: 24px;
}

/* ===== Animation ===== */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 968px) {
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(250, 250, 250, 0.95);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-bottom: 1px solid rgba(0, 0, 0, 0.06);
        padding: 24px 32px;
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
    }

    .nav.open {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-cta {
        text-align: center;
    }

    .about-grid,
    .content-feature,
    .follow-card {
        grid-template-columns: 1fr;
        gap: 48px;
        padding: 40px;
    }

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

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

    .hero-meta {
        gap: 32px;
    }

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

@media (max-width: 600px) {
    .container {
        padding: 0 20px;
    }

    .section {
        padding: 80px 0;
    }

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

    .hero-title-cn {
        font-size: 48px;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

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

    .qr-frame img {
        width: 200px;
        height: 200px;
    }

    .content-feature,
    .follow-card {
        padding: 28px;
    }
}