/* Font Awesome 回退样式 - 使用系统图标字体 */

/* 基础图标样式 */
.fas, .far, .fab, .fa {
    font-family: 'Segoe UI Symbol', 'Apple Symbols', 'Noto Sans Symbols', 'Arial Unicode MS', sans-serif;
    font-weight: normal;
    font-style: normal;
    display: inline-block;
    text-rendering: auto;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1;
    text-align: center;
}

/* 常用图标映射 */
.fa-atom::before { content: '⚛'; }
.fa-newspaper::before { content: '📰'; }
.fa-calendar-alt::before { content: '📅'; }
.fa-arrow-right::before { content: '→'; }
.fa-star::before { content: '⭐'; }
.fa-chevron-left::before { content: '‹'; }
.fa-chevron-right::before { content: '›'; }
.fa-graduation-cap::before { content: '🎓'; }
.fa-clock::before { content: '🕐'; }
.fa-handshake::before { content: '🤝'; }
.fa-check-circle::before { content: '✅'; }
.fa-comments::before { content: '💬'; }
.fa-laptop-code::before { content: '💻'; }
.fa-file-alt::before { content: '📄'; }
.fa-users::before { content: '👥'; }
.fa-flask::before { content: '🧪'; }
.fa-cog::before { content: '⚙'; }
.fa-rocket::before { content: '🚀'; }
.fa-chart-line::before { content: '📈'; }
.fa-lightbulb::before { content: '💡'; }
.fa-shield-alt::before { content: '🛡'; }
.fa-globe::before { content: '🌍'; }
.fa-envelope::before { content: '✉'; }
.fa-phone::before { content: '📞'; }
.fa-map-marker-alt::before { content: '📍'; }
.fa-share-alt::before { content: '🔗'; }
.fa-download::before { content: '⬇'; }
.fa-upload::before { content: '⬆'; }
.fa-search::before { content: '🔍'; }
.fa-filter::before { content: '🔧'; }
.fa-sort::before { content: '↕'; }
.fa-edit::before { content: '✏'; }
.fa-trash::before { content: '🗑'; }
.fa-plus::before { content: '+'; }
.fa-minus::before { content: '-'; }
.fa-times::before { content: '×'; }
.fa-check::before { content: '✓'; }
.fa-exclamation::before { content: '!'; }
.fa-question::before { content: '?'; }

/* 确保所有Font Awesome类都能正确回退 */
[class*="fa-"]::before {
    font-family: 'Segoe UI Symbol', 'Apple Symbols', 'Noto Sans Symbols', 'Arial Unicode MS', sans-serif;
}

/* 确保图标大小合适 */
.logo-icon i {
    font-size: 20px;
    line-height: 1;
}

.nav-link i {
    margin-right: 4px;
}

.section-header i {
    margin-right: 8px;
}

.slider-btn i {
    font-size: 12px;
}

.feature-icon i {
    font-size: 20px;
}

.social-btn i {
    font-size: 14px;
}

/* 防止图标缺失导致的布局问题 */
.fas, .far, .fab {
    min-width: 16px;
    min-height: 16px;
}

/* 确保图标大小合适 */
.logo-icon i {
    font-size: 20px;
    line-height: 1;
}

.nav-link i {
    margin-right: 4px;
}

.section-header i {
    margin-right: 8px;
}

.slider-btn i {
    font-size: 12px;
}

.feature-icon i {
    font-size: 20px;
}

.social-btn i {
    font-size: 14px;
}