/* 基本图标样式 - 当Font Awesome无法加载时的备用方案 */

.fas, .fa {
    font-family: "Font Awesome 6 Free", "Font Awesome 5 Free", sans-serif;
    font-weight: 900;
    display: inline-block;
    font-style: normal;
    font-variant: normal;
    text-rendering: auto;
    line-height: 1;
}

/* 如果Font Awesome无法加载，使用文字替代 */
.fas.fa-shield-alt::before, .fa-shield-alt::before { content: "🛡️"; }
.fas.fa-user::before, .fa-user::before { content: "👤"; }
.fas.fa-sync-alt::before, .fa-sync-alt::before { content: "🔄"; }
.fas.fa-sign-out-alt::before, .fa-sign-out-alt::before { content: "🚪"; }
.fas.fa-database::before, .fa-database::before { content: "💾"; }
.fas.fa-key::before, .fa-key::before { content: "🔑"; }
.fas.fa-lock::before, .fa-lock::before { content: "🔒"; }
.fas.fa-eye::before, .fa-eye::before { content: "👁️"; }
.fas.fa-trash::before, .fa-trash::before { content: "🗑️"; }
.fas.fa-home::before, .fa-home::before { content: "🏠"; }
.fas.fa-save::before, .fa-save::before { content: "💾"; }
.fas.fa-arrow-left::before, .fa-arrow-left::before { content: "←"; }
.fas.fa-check-circle::before, .fa-check-circle::before { content: "✅"; }
.fas.fa-exclamation-circle::before, .fa-exclamation-circle::before { content: "⚠️"; }
.fas.fa-info-circle::before, .fa-info-circle::before { content: "ℹ️"; }
.fas.fa-sign-in-alt::before, .fa-sign-in-alt::before { content: "🔑"; }

/* 图标大小 */
.fa-3x { font-size: 3em; }
.fa-2x { font-size: 2em; }

/* 间距 */
.me-1 { margin-right: 0.25rem; }
.me-2 { margin-right: 0.5rem; }
.me-3 { margin-right: 1rem; }
.mb-3 { margin-bottom: 1rem; }