:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f1f4f9;
    --text-primary: #1a1c1e;
    --text-secondary: #333333;
    --accent-primary: #006397;
    --accent-hover: #004d7a;
    --border-color: #e0e4e9;
    --font-heading: 'Archivo', sans-serif;
    --font-body: 'Figtree', sans-serif;
    --radius-card: 40px;
    --radius-pill: 50px;
    --container-width: 1200px;
    --section-padding: 80px 0;
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
    font-family: var(--font-heading);
    font-weight: 700;
}

/* Utils */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

[lang="cn"] {
    display: none;
}

body.lang-cn [lang="cn"] {
    display: block;
}

body.lang-cn [lang="en"] {
    display: none;
}

.logo-img {
    width: 160px;
    height: 40px;
    margin-top: 10px;
}

/* Navbar */
nav {
    height: 80px;
    display: flex;
    align-items: center;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo-text {
    font-family: var(--font-heading);
    color: var(--accent-primary);
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.lang-switch {
    display: flex;
    gap: 8px;
    background: var(--bg-secondary);
    padding: 4px;
    border-radius: var(--radius-pill);
}

.lang-switch button {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 6px 16px;
    height: 36px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: var(--radius-pill);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.lang-switch button:hover {
    color: var(--accent-primary);
}

body.lang-en #btn-en,
body.lang-cn #btn-cn {
    background: var(--bg-primary);
    color: var(--accent-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

/* Hero Section */
#hero-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    padding: 100px 0;
    background:
        radial-gradient(circle at 50% 50%, rgba(0, 99, 151, 0.05) 0%, transparent 50%),
        linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    position: relative;
    overflow: hidden;
    text-align: center;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--border-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
    background-size: 40px 40px;
    mask-image: radial-gradient(circle at 50% 50%, black, transparent 80%);
    opacity: 0.4;
    z-index: 0;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 24px;
    color: var(--text-primary);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.hero p {
    font-size: 1.25rem;
    max-width: 700px;
    color: var(--text-secondary);
    margin: 0 auto 48px;
    font-weight: 400;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-primary);
    color: #fff;
    padding: 14px 32px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    border-radius: var(--radius-pill);
    transition: all 0.3s ease;
    border: none;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 99, 151, 0.2);
}

/* Sections */
section {
    padding: var(--section-padding);
}

h2 {
    font-size: 2.8rem;
    margin-bottom: 48px;
    color: var(--text-primary);
    text-align: center;
}

.about-content {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
}

.about-content p {
    margin-bottom: 24px;
}

/* Photo Wall */
.photo-wall {
    width: 100vw;
    position: relative;
    left: 50%;
    right: 50%;
    margin-left: -50vw;
    margin-right: -50vw;
    overflow: hidden;
    background: var(--bg-secondary);
    padding: 60px 0;
}

.marquee-content {
    display: flex;
    gap: 32px;
    width: max-content;
    animation: scroll-left 60s linear infinite;
}

.marquee-content img {
    height: 320px;
    width: auto;
    border-radius: var(--radius-card);
    object-fit: cover;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

.marquee-content img:hover {
    transform: scale(1.02);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
}

@keyframes scroll-left {
    0% {
        transform: translateX(0);
    }

    100% {
        transform: translateX(-50%);
    }
}

/* Intelligence Cards */
.intelligence-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
}

.card {
    background: var(--bg-secondary);
    border: none;
    padding: 48px;
    border-radius: var(--radius-card);
    transition: all 0.4s ease;
    display: flex;
    flex-direction: column;
}

.card:hover {
    background: #fff;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.06);
    transform: translateY(-4px);
}

.card .date {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: 8px;
    display: block;
}

.card .tag {
    font-size: 12px;
    font-weight: 700;
    background: #fff;
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: var(--radius-pill);
    margin-bottom: 24px;
    display: inline-block;
    align-self: flex-start;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.card h3 {
    font-size: 1.5rem;
    line-height: 1.4;
    margin-bottom: 16px;
    color: var(--text-primary);
}

/* Pillars grid */
.pillars-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.pillar {
    background: var(--bg-primary);
    padding: 40px;
    border-radius: var(--radius-card);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.pillar:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 12px 24px rgba(0, 99, 151, 0.05);
}

.pillar h3 {
    color: var(--accent-primary);
    margin-bottom: 16px;
    font-size: 1.4rem;
}

.pillar p {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Footer */
footer {
    padding: 80px 0;
    background: var(--bg-secondary);
    font-size: 14px;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 48px;
}

.footer-info p {
    margin-bottom: 12px;
}

.footer-info strong {
    color: var(--text-primary);
}

.footer-copy {
    color: #999;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .footer-content {
        flex-direction: column;
    }
}