* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
    background-color: #fefefe;
    color: #1e2b3c;
    line-height: 1.5;
    scroll-behavior: smooth;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* CTA header section */
.hero {
    background: linear-gradient(145deg, #f8fafc 0%, #eef2f6 100%);
    padding: 48px 0 56px;
    border-bottom: 4px solid #ffb347;
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
    max-width: 900px;
    color: #0a1a2b;
}

.hero h1 span {
    color: #c45500;
    border-bottom: 3px solid #ffb347;
    display: inline-block;
    padding-bottom: 4px;
}

.hero p {
    font-size: 1.3rem;
    color: #2c3e50;
    max-width: 700px;
    margin-bottom: 8px;
}

/* primary button – extra prominent */
.btn-primary-block {
    margin: 12px 0 16px;
}

.btn-primary {
    background-color: #ffcc00;  /* vivid yellow */
    color: #0f1c2c !important;
    padding: 22px 48px;
    font-size: 2rem;
    font-weight: 800;
    text-transform: uppercase;
    text-decoration: none;
    border-radius: 60px;
    display: inline-block;
    box-shadow: 0 10px 20px -5px rgba(255, 200, 0, 0.5), 0 4px 10px rgba(0,0,0,0.1);
    border: 2px solid #0f1c2c;
    letter-spacing: 2px;
    transition: 0.2s;
    line-height: 1.2;
}

.btn-primary:hover {
    background-color: #ffdd44;
    transform: scale(1.02);
    box-shadow: 0 18px 25px -8px #f0b300;
}

.btn-group-row {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 10px;
    align-items: center;
}

.btn-social {
    background-color: #1e2b3c;
    color: white !important;
    padding: 16px 36px;
    font-size: 1.35rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 50px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: 0.2s;
    border: 1px solid #33495f;
}

.btn-social:hover {
    background-color: #2b3e54;
}

.btn-social i { font-style: normal; font-weight: 400; opacity: 0.9; }

/* section general */
section {
    padding: 64px 0;
    border-bottom: 1px solid #e2e8f0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 40px;
    color: #0f2a40;
    position: relative;
    padding-bottom: 16px;
}

.section-title:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 5px;
    background: #ffb347;
    border-radius: 4px;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 32px;
}

.card {
    background: white;
    border-radius: 24px;
    padding: 28px 22px;
    box-shadow: 0 12px 26px -8px rgba(0, 20, 40, 0.1);
    transition: 0.15s;
    border: 1px solid #f0f3f7;
}

.card:hover {
    box-shadow: 0 25px 35px -12px #b3c7db;
}

.card h3 {
    font-size: 1.8rem;
    margin-bottom: 16px;
    color: #163a5c;
}

/*图文板块 1 & 2 */
.feature-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.feature-item {
    display: flex;
    flex-direction: column;
    gap: 24px;
    background: #ffffff;
    border-radius: 32px;
    padding: 32px;
    box-shadow: 0 10px 25px rgba(0, 30, 60, 0.05);
}

.feature-image {
    background-color: #d9e2ec;
    height: 240px;
    border-radius: 28px;
    background-size: cover;
    background-position: center;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.3);
}

.feature-item h2 {
    font-size: 2rem;
    font-weight: 700;
    color: #003153;
}

.feature-item p {
    font-size: 1.2rem;
    color: #1f3a57;
}

.img-label {
    background: rgba(0,0,0,0.3);
    color: white;
    display: inline-block;
    padding: 6px 18px;
    border-radius: 40px;
    font-weight: 600;
    backdrop-filter: blur(4px);
}

/* utility */
.text-soft { color: #2d4b6e; }

.link-more {
    color: #c45500;
    font-weight: 600;
    text-decoration: none;
    font-size: 1.1rem;
}

.footer {
    background: #0f1e2f;
    color: #b0c7da;
    padding: 40px 0;
    text-align: center;
}

/* responsive */
@media (max-width: 800px) {
    .hero h1 { font-size: 2.5rem; }
    .btn-primary { font-size: 1.6rem; padding: 18px 32px; }
    .feature-grid { grid-template-columns: 1fr; }
}