:root {
    --blue-950: #070d1a;
    --blue-900: #0c1a33;
    --blue-800: #132a52;
    --blue-600: #2563eb;
    --blue-500: #3b82f6;
    --blue-100: #e8eef8;
    --gold: #d4af37;
    --gold-light: #f0d78c;
    --text: #1e293b;
    --text-muted: #64748b;
    --white: #ffffff;
    --shadow: 0 12px 40px rgba(7, 13, 26, 0.12);
    --radius: 12px;
}

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

body {
    font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.7;
    color: var(--text);
    background: var(--blue-100);
}

.container {
    width: 100%;
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 20px;
}

h1, h2, h3 {
    font-family: 'Noto Serif SC', 'Microsoft YaHei', serif;
    font-weight: 700;
    color: var(--blue-900);
}

h1 {
    font-size: clamp(2rem, 4vw, 2.75rem);
    line-height: 1.25;
}

h2 {
    font-size: clamp(1.75rem, 3vw, 2.125rem);
}

h3 {
    font-size: 1.25rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-muted);
}

.section {
    padding: 5rem 0;
}

.section-head {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 3rem;
}

.section-head--light h2,
.section-head--light .section-eyebrow {
    color: var(--gold-light);
}

.section-eyebrow {
    display: block;
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    color: var(--gold);
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.section-lead {
    font-size: 1.05rem;
    margin-bottom: 0;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.75rem;
    border-radius: 999px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--gold) 0%, #b8962e 100%);
    color: var(--blue-950);
    box-shadow: 0 8px 24px rgba(212, 175, 55, 0.35);
}

.btn-outline {
    border: 2px solid rgba(255, 255, 255, 0.85);
    color: var(--white);
    margin-left: 0.75rem;
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.12);
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(7, 13, 26, 0.55);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(212, 175, 55, 0.2);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.header--scrolled {
    background: rgba(7, 13, 26, 0.92);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 20px;
}

.logo a {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--white);
    text-decoration: none;
}

.nav ul {
    display: flex;
    list-style: none;
    gap: 1.75rem;
}

.nav ul li a {
    color: rgba(255, 255, 255, 0.88);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
}

.nav ul li a:hover {
    color: var(--gold-light);
}

.banner {
    position: relative;
    margin-top: 0;
    padding: 9rem 0 6rem;
    text-align: center;
    color: var(--white);
    background: var(--blue-900) url('images/banner.jpg') center/cover no-repeat;
    overflow: hidden;
}

.banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        160deg,
        rgba(7, 13, 26, 0.88) 0%,
        rgba(19, 42, 82, 0.75) 45%,
        rgba(37, 99, 235, 0.35) 100%
    );
    z-index: 0;
}

.banner-glow {
    position: absolute;
    top: -20%;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 60%;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.15) 0%, transparent 65%);
    z-index: 0;
    pointer-events: none;
}

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

.banner-eyebrow {
    font-size: 0.7rem;
    letter-spacing: 0.25em;
    color: var(--gold-light);
    margin-bottom: 1rem;
}

.banner h1 {
    color: var(--white);
    margin-bottom: 1.25rem;
    text-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.banner-lead {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.1rem;
    max-width: 640px;
    margin: 0 auto 2rem;
}

.banner-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
}

.services {
    background: var(--white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}

.service-item {
    background: linear-gradient(180deg, #f8fafc 0%, var(--white) 100%);
    padding: 2rem 1.5rem;
    border-radius: var(--radius);
    border: 1px solid rgba(37, 99, 235, 0.12);
    box-shadow: var(--shadow);
    transition: transform 0.25s ease, border-color 0.25s ease;
}

.service-item:hover {
    transform: translateY(-6px);
    border-color: rgba(212, 175, 55, 0.45);
}

.service-icon {
    width: 44px;
    height: 44px;
    line-height: 44px;
    text-align: center;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--blue-600), var(--blue-800));
    color: var(--gold-light);
    font-size: 1rem;
    margin-bottom: 1rem;
}

.service-item h3 {
    margin-bottom: 0.75rem;
}

.service-item p {
    margin-bottom: 0;
    font-size: 0.95rem;
}

.about {
    background: linear-gradient(165deg, var(--blue-950) 0%, var(--blue-800) 50%, var(--blue-600) 100%);
    color: var(--white);
}

.about-layout {
    display: grid;
    gap: 2rem;
}

.about-card {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(212, 175, 55, 0.25);
    border-radius: var(--radius);
    padding: 2.5rem;
    backdrop-filter: blur(8px);
    box-shadow: var(--shadow);
}

.about-card h3 {
    color: var(--gold-light);
    margin-bottom: 1.25rem;
    font-size: 1.5rem;
}

.about-card p {
    color: rgba(255, 255, 255, 0.85);
}

.about-pillars {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.about-pillars li {
    text-align: center;
}

.about-pillars strong {
    display: block;
    color: var(--gold);
    font-size: 1.1rem;
    margin-bottom: 0.35rem;
}

.about-pillars span {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
}

.cases {
    background: var(--blue-100);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.75rem;
}

.case-item {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid rgba(37, 99, 235, 0.08);
    transition: transform 0.25s ease;
}

.case-item:hover {
    transform: translateY(-6px);
}

.case-img img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
}

.case-info {
    padding: 1.5rem;
}

.case-info h3 {
    margin-bottom: 0.5rem;
}

.case-info p {
    margin-bottom: 0;
    font-size: 0.95rem;
}

.is-hidden {
    display: none !important;
}

.footer {
    background: var(--blue-950);
    color: rgba(255, 255, 255, 0.75);
    padding: 2.5rem 0 1.75rem;
    border-top: 3px solid var(--gold);
}

.footer-brand {
    text-align: center;
    margin-bottom: 1.5rem;
}

.footer-name {
    font-family: 'Noto Serif SC', serif;
    color: var(--white);
    font-size: 1.1rem;
    margin-bottom: 0.35rem;
}

.footer-tagline {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.55);
    margin-bottom: 0;
}

.footer-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem 1.5rem;
    margin-bottom: 1.5rem;
}

.footer-nav a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 0.9rem;
}

.footer-nav a:hover {
    color: var(--gold-light);
}

.footer-legal {
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.25rem;
}

.footer-legal-line {
    font-size: 0.85rem;
    margin: 0 0 0.5rem;
    color: rgba(255, 255, 255, 0.55);
}

.footer-legal a {
    color: rgba(255, 255, 255, 0.65);
    text-decoration: none;
}

.footer-legal a:hover {
    color: var(--gold-light);
}

@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 0.75rem;
    }

    .nav ul {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .banner {
        padding: 7.5rem 0 4.5rem;
    }

    .btn-outline {
        margin-left: 0;
    }

    .about-pillars {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 3.5rem 0;
    }
}

@media (max-width: 480px) {
    .services-grid,
    .cases-grid {
        grid-template-columns: 1fr;
    }
}