/* 本地图标系统 - 替代Font Awesome */

/* 图标基础样式 */
.icon {
    display: inline-block;
    font-style: normal;
    font-variant: normal;
    text-rendering: auto;
    line-height: 1;
    font-family: Arial, sans-serif;
}

/* 具体图标定义 */
.icon-robot::before { content: "🤖"; }
.icon-code::before { content: "💻"; }
.icon-mobile::before { content: "📱"; }
.icon-brain::before { content: "🧠"; }
.icon-server::before { content: "🖥️"; }
.icon-envelope::before { content: "✉️"; }
.icon-calendar::before { content: "📅"; }
.icon-clock::before { content: "⏰"; }
.icon-arrow-right::before { content: "→"; }
.icon-arrow-up::before { content: "↑"; }

/* GitHub图标 */
.icon-github::before { 
    content: "";
    display: inline-block;
    width: 1em;
    height: 1em;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='currentColor'%3E%3Cpath d='M12 0c-6.626 0-12 5.373-12 12 0 5.302 3.438 9.8 8.207 11.387.599.111.793-.261.793-.577v-2.234c-3.338.726-4.033-1.416-4.033-1.416-.546-1.387-1.333-1.756-1.333-1.756-1.089-.745.083-.729.083-.729 1.205.084 1.839 1.237 1.839 1.237 1.07 1.834 2.807 1.304 3.492.997.107-.775.418-1.305.762-1.604-2.665-.305-5.467-1.334-5.467-5.931 0-1.311.469-2.381 1.236-3.221-.124-.303-.535-1.524.117-3.176 0 0 1.008-.322 3.301 1.23.957-.266 1.983-.399 3.003-.404 1.02.005 2.047.138 3.006.404 2.291-1.552 3.297-1.23 3.297-1.23.653 1.653.242 2.874.118 3.176.77.84 1.235 1.911 1.235 3.221 0 4.609-2.807 5.624-5.479 5.921.43.372.823 1.102.823 2.222v3.293c0 .319.192.694.801.576 4.765-1.589 8.199-6.086 8.199-11.386 0-6.627-5.373-12-12-12z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-size: contain;
}

/* Twitter图标 */
.icon-twitter::before { 
    content: "";
    display: inline-block;
    width: 1em;
    height: 1em;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='currentColor'%3E%3Cpath d='M23.953 4.57a10 10 0 01-2.825.775 4.958 4.958 0 002.163-2.723c-.951.555-2.005.959-3.127 1.184a4.92 4.92 0 00-8.384 4.482C7.69 8.095 4.067 6.13 1.64 3.162a4.822 4.822 0 00-.666 2.475c0 1.71.87 3.213 2.188 4.096a4.904 4.904 0 01-2.228-.616v.06a4.923 4.923 0 003.946 4.827 4.996 4.996 0 01-2.212.085 4.936 4.936 0 004.604 3.417 9.867 9.867 0 01-6.102 2.105c-.39 0-.779-.023-1.17-.067a13.995 13.995 0 007.557 2.209c9.053 0 13.998-7.496 13.998-13.985 0-.21 0-.42-.015-.63A9.935 9.935 0 0024 4.59z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-size: contain;
}

/* LinkedIn图标 */
.icon-linkedin::before { 
    content: "";
    display: inline-block;
    width: 1em;
    height: 1em;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='currentColor'%3E%3Cpath d='M20.447 20.452h-3.554v-5.569c0-1.328-.027-3.037-1.852-3.037-1.853 0-2.136 1.445-2.136 2.939v5.667H9.351V9h3.414v1.561h.046c.477-.9 1.637-1.85 3.37-1.85 3.601 0 4.267 2.37 4.267 5.455v6.286zM5.337 7.433c-1.144 0-2.063-.926-2.063-2.065 0-1.138.92-2.063 2.063-2.063 1.14 0 2.064.925 2.064 2.063 0 1.139-.925 2.065-2.064 2.065zm1.782 13.019H3.555V9h3.564v11.452zM22.225 0H1.771C.792 0 0 .774 0 1.729v20.542C0 23.227.792 24 1.771 24h20.451C23.2 24 24 23.227 24 22.271V1.729C24 .774 23.2 0 22.222 0h.003z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-size: contain;
}

/* YouTube图标 */
.icon-youtube::before { 
    content: "";
    display: inline-block;
    width: 1em;
    height: 1em;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='currentColor'%3E%3Cpath d='M23.498 6.186a3.016 3.016 0 0 0-2.122-2.136C19.505 3.545 12 3.545 12 3.545s-7.505 0-9.377.505A3.017 3.017 0 0 0 .502 6.186C0 8.07 0 12 0 12s0 3.93.502 5.814a3.016 3.016 0 0 0 2.122 2.136c1.871.505 9.376.505 9.376.505s7.505 0 9.377-.505a3.015 3.015 0 0 0 2.122-2.136C24 15.93 24 12 24 12s0-3.93-.502-5.814zM9.545 15.568V8.432L15.818 12l-6.273 3.568z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-size: contain;
}

/* 箭头图标使用Unicode字符 */
.icon-arrow-right::before { content: "▶"; }
.icon-arrow-up::before { content: "▲"; }

/* 图标大小调整 */
.icon-sm { font-size: 0.875rem; }
.icon-lg { font-size: 1.25rem; }
.icon-xl { font-size: 1.5rem; }
.icon-2x { font-size: 2rem; }

/* 图标动画 */
.icon-spin {
    animation: icon-spin 2s infinite linear;
}

@keyframes icon-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 图标颜色 */
.icon-primary { color: var(--primary-color, #667eea); }
.icon-secondary { color: var(--secondary-color, #764ba2); }
.icon-success { color: #10B981; }
.icon-warning { color: #F59E0B; }
.icon-danger { color: #EF4444; }