.page-content {
    flex: 1;
    max-width: 1000px;
    margin: 2rem auto;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(4px);
    border-radius: 36px;
    box-shadow: 0 20px 40px rgba(0, 10, 30, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.6)
}

h1 {
    font-size: 2.5rem;
    font-weight: 600;
    background: linear-gradient(135deg, #1e2b4a, #3a4e6b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-top: 0
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0
}

.demo-card {
    background: white;
    padding: 1.5rem;
    border-radius: 28px;
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.05);
    transition: all 0.2s;
    border: 1px solid rgba(255, 255, 255, 0.8)
}

.demo-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 25px -8px rgba(0, 40, 80, 0.2)
}

button {
    background: #1e2b4a;
    color: white;
    border: none;
    padding: 0.6rem 1.5rem;
    border-radius: 40px;
    font-weight: 500;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s;
    box-shadow: 0 4px 8px rgba(0, 20, 50, 0.1)
}

button:hover {
    background: #2c3f64
}

#announcement-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    z-index: 10000
}

.announcement-box {
    background: #ffffff;
    max-width: 380px;
    width: 90%;
    border-radius: 32px;
    box-shadow: 0 35px 70px rgba(0, 0, 0, 0.25), 0 15px 30px rgba(0, 20, 40, 0.2);
    padding: 1.8rem 1.8rem 2rem 1.8rem;
    position: relative;
    pointer-events: auto;
    animation: floatIn 0.3s cubic-bezier(0.15, 1.1, 0.3, 1);
    border: 1px solid rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(2px);
    background: rgba(255, 255, 255, 0.95)
}

.announcement-header {
    display: flex;
    align-items: center;
    margin-bottom: 1rem
}

.announcement-icon {
    background: #f2f5fc;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    margin-right: 12px
}

.announcement-header h2 {
    margin: 0;
    font-size: 1.7rem;
    font-weight: 650;
    letter-spacing: -0.01em;
    color: #121f33
}

.close-announcement {
    position: absolute;
    top: 16px;
    right: 20px;
    background: none;
    border: none;
    font-size: 28px;
    line-height: 1;
    cursor: pointer;
    color: #6b7a8f;
    padding: 4px 8px;
    margin: 0;
    border-radius: 30px;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: none;
    width: auto;
    background: transparent
}

.close-announcement:hover {
    color: #121f33;
    background: rgba(0, 0, 0, 0.04);
    transform: scale(1.1)
}

.announcement-content {
    color: #1f2b3a;
    margin: 1.2rem 0 1.8rem 0;
    font-size: 1rem;
    line-height: 1.6
}

.announcement-content p {
    margin: 0.8rem 0
}

.announcement-content .highlight {
    background: #f0eef9;
    padding: 0.2rem 0.5rem;
    border-radius: 30px;
    font-weight: 500;
    color: #2a3c5e
}

.action-btn {
    background: #1e2b4a;
    color: white;
    border: none;
    padding: 0.6rem 2rem;
    border-radius: 60px;
    font-size: 0.95rem;
    font-weight: 500;
    width: 100%;
    cursor: default;
    opacity: 0.9;
    transition: 0.1s;
    box-shadow: 0 4px 12px rgba(20, 40, 70, 0.15)
}

.action-btn:hover {
    opacity: 1
}

@keyframes floatIn {
    0% {
        opacity: 0;
        transform: scale(0.92) translateY(10px)
    }

    100% {
        opacity: 1;
        transform: scale(1) translateY(0)
    }
}

.hidden-announcement {
    display: none !important
}

.footer-note {
    margin-top: 3rem;
    font-size: 0.9rem;
    color: #3f506e;
    background: rgba(255, 255, 255, 0.5);
    padding: 1rem 2rem;
    border-radius: 100px;
    text-align: center
}