/* Reset & Base */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: "Microsoft YaHei", "Heiti SC", sans-serif;
    color: #fff;
    background-color: #000510;
    line-height: 1.6;
    font-size: 14px;
}

/* Background Effect */
.tech-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background:
        linear-gradient(90deg, rgba(0, 100, 255, 0.05) 1px, transparent 1px),
        linear-gradient(rgba(0, 100, 255, 0.05) 1px, transparent 1px),
        radial-gradient(circle at 50% 50%, rgba(0, 40, 100, 0.4) 0%, #000510 100%);
    background-size: 100px 100px, 100px 100px, 100% 100%;
    /* Add some "light beams" */
    background-image: url('./background.png');
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.main-header {
    text-align: center;
    margin-bottom: 30px;
    padding-top: 20px;
}

.main-header h1 {
    font-size: 28px;
    font-weight: bold;
    margin-bottom: 5px;
    letter-spacing: 2px;
}

.main-header p {
    font-size: 14px;
    color: #8aa;
    opacity: 0.8;
}

/* Cards */
.card {
    background: rgba(10, 25, 50, 0.7);
    border: 1px solid rgba(0, 150, 255, 0.3);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 0 15px rgba(0, 100, 255, 0.1);
    backdrop-filter: blur(5px);
}

.card h2 {
    font-size: 16px;
    font-weight: bold;
    margin-bottom: 15px;
    color: #fff;
}

/* Join Section */
.join-section p {
    font-size: 12px;
    color: #ccc;
    margin-bottom: 20px;
}

.whatsapp-btn {
    display: block;
    width: 100%;
    background-color: #25D366;
    color: #fff;
    text-align: center;
    padding: 12px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    font-size: 16px;
    transition: background 0.3s;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.whatsapp-btn:hover {
    background-color: #1ebc57;
}

/* Lists */
.bullet-list,
.numbered-list {
    padding-left: 20px;
    color: #ddd;
    font-size: 13px;
}

.bullet-list li,
.numbered-list li {
    margin-bottom: 8px;
}

.bullet-list li strong,
.numbered-list li strong {
    color: #fff;
}

/* Example Grid */
.example-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.example-box {
    background: rgba(255, 255, 255, 0.1);
    padding: 10px;
    border-radius: 5px;
    font-size: 12px;
    color: #ddd;
}

.example-box strong {
    color: #fff;
}

/* Disclaimer */
.disclaimer-card p {
    font-size: 12px;
    color: #aaa;
    line-height: 1.5;
}

/* Table */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
    margin-top: 10px;
}

.comparison-table th,
.comparison-table td {
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 8px;
    text-align: left;
}

.comparison-table th {
    background: rgba(0, 150, 255, 0.1);
    color: #fff;
}

.comparison-table td {
    color: #ddd;
}

/* Responsive */
@media (max-width: 480px) {
    .container {
        padding: 15px;
    }

    .main-header h1 {
        font-size: 24px;
    }
}