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

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: #0f172a;
    color: #94a3b8;
    line-height: 1.6;
    overflow-x: hidden;
    width: 100%;
}

header {
    width: 100%;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: #ffffff;
    font-weight: 700;
    font-size: 18px;
}

.brand-logo {
    width: 34px;
    height: 34px;
    border-radius: 9px;
    overflow: hidden; 
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.brand-logo img {
    width: 100%;
    height: 100%;
    object-fit: cover; 
    display: block;
}

.nav-btn {
    background: rgba(56, 189, 248, 0.1);
    color: #38bdf8;
    border: 1px solid rgba(56, 189, 248, 0.3);
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.nav-btn:hover {
    background: #38bdf8;
    color: #0f172a;
}

.hero {
    position: relative;
    max-width: 1100px;
    margin: 0 auto;
    padding: 60px 24px;
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 48px;
    align-items: center;
}

.hero-text h1 {
    font-size: 38px;
    font-weight: 800;
    color: #ffffff;
    line-height: 1.25;
    margin-bottom: 18px;
    letter-spacing: -0.5px;
}

.hero-text h1 span {
    background: linear-gradient(135deg, #38bdf8 0%, #60a5fa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-text p {
    font-size: 16px;
    color: #cbd5e1;
    margin-bottom: 24px;
}

.hero-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}

.tag {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #94a3b8;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 13px;
}

.action-card {
    background: rgba(30, 41, 59, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 32px 24px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
    text-align: center;
}

.card-title {
    font-size: 20px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 8px;
}

.card-desc {
    font-size: 13px;
    color: #94a3b8;
    margin-bottom: 24px;
}

.btn-main {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    background: linear-gradient(135deg, #38bdf8 0%, #2563eb 100%);
    color: #ffffff;
    font-size: 16px;
    font-weight: 600;
    padding: 16px 0;
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.25s ease;
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
    -webkit-tap-highlight-color: transparent;
}

.btn-main:active {
    transform: scale(0.98);
}

.icon-arrow {
    margin-left: 8px;
}

.security-tip {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 12px;
    color: #10b981;
    margin-top: 16px;
}

.security-tip i {
    font-size: 14px;
    color: #10b981;
}

.features-section {
    max-width: 1100px;
    margin: 40px auto;
    padding: 0 24px;
}

.section-header {
    text-align: center;
    margin-bottom: 36px;
}

.section-header h2 {
    font-size: 28px;
    color: #ffffff;
    margin-bottom: 8px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: rgba(30, 41, 59, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    padding: 24px;
}

.feature-icon {
    width: 44px;
    height: 44px;
    background: rgba(56, 189, 248, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.feature-icon i {
    font-size: 20px;
    color: #38bdf8;
}

.feature-card h3 {
    font-size: 18px;
    color: #ffffff;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 14px;
    color: #94a3b8;
}

.faq-section {
    max-width: 800px;
    margin: 50px auto;
    padding: 0 24px;
}

.faq-item {
    background: rgba(30, 41, 59, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 20px 24px;
    margin-bottom: 16px;
}

.faq-item h3 {
    font-size: 16px;
    color: #ffffff;
    margin-bottom: 8px;
}

.faq-item p {
    font-size: 14px;
    color: #94a3b8;
}

footer {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 28px 20px;
    text-align: center;
    font-size: 13px;
    color: #64748b;
}

@media (max-width: 900px) {
    .hero {
        grid-template-columns: 1fr;
        padding: 32px 20px;
        gap: 32px;
        text-align: center;
    }
    .hero-text h1 {
        font-size: 28px;
    }
    .hero-text p {
        font-size: 15px;
    }
    .hero-highlights {
        justify-content: center;
    }
    .grid-3 {
        grid-template-columns: 1fr;
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 12px 16px;
    }
    .brand span {
        font-size: 16px;
    }
    .hero-text h1 {
        font-size: 24px;
    }
    .action-card {
        padding: 24px 18px;
    }
    .btn-main {
        font-size: 15px;
        padding: 14px 0;
    }
    .faq-item {
        padding: 16px;
    }
}