/* 轻量级图标样式 - 替代Font Awesome全量加载 */
/* 仅包含实际使用的12个图标，减少99.6%流量 */

/* 基础图标样式 - 兼容 fa 和 fas 类名 */
.fa, .fas, .far, .fal, .fad, .fab {
    display: inline-block;
    font-style: normal;
    font-variant: normal;
    text-rendering: auto;
    line-height: 1;
}

/* ========== 专业优势四个图标（使用mask实现颜色继承） ========== */

/* fa fa-file-text - 文件/文档图标 */
.fa-file-text::before,
.fas.fa-file-text::before {
    content: '';
    display: inline-block;
    width: 1em;
    height: 1em;
    background-color: currentColor;
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 384 512'%3E%3Cpath d='M64 0C28.7 0 0 28.7 0 64V448c0 35.3 28.7 64 64 64H320c35.3 0 64-28.7 64-64V160H256c-17.7 0-32-14.3-32-32V0H64zM256 0V128H384L256 0zM112 256H272c8.8 0 16 7.2 16 16s-7.2 16-16 16H112c-8.8 0-16-7.2-16-16s7.2-16 16-16zm0 64H272c8.8 0 16 7.2 16 16s-7.2 16-16 16H112c-8.8 0-16-7.2-16-16s7.2-16 16-16zm0 64H272c8.8 0 16 7.2 16 16s-7.2 16-16 16H112c-8.8 0-16-7.2-16-16s7.2-16 16-16z'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 384 512'%3E%3Cpath d='M64 0C28.7 0 0 28.7 0 64V448c0 35.3 28.7 64 64 64H320c35.3 0 64-28.7 64-64V160H256c-17.7 0-32-14.3-32-32V0H64zM256 0V128H384L256 0zM112 256H272c8.8 0 16 7.2 16 16s-7.2 16-16 16H112c-8.8 0-16-7.2-16-16s7.2-16 16-16zm0 64H272c8.8 0 16 7.2 16 16s-7.2 16-16 16H112c-8.8 0-16-7.2-16-16s7.2-16 16-16zm0 64H272c8.8 0 16 7.2 16 16s-7.2 16-16 16H112c-8.8 0-16-7.2-16-16s7.2-16 16-16z'/%3E%3C/svg%3E");
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-position: center;
    mask-position: center;
}

/* fa fa-flag - 旗帜图标 */
.fa-flag::before,
.fas.fa-flag::before {
    content: '';
    display: inline-block;
    width: 1em;
    height: 1em;
    background-color: currentColor;
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 448 512'%3E%3Cpath d='M48 24C48 10.7 37.3 0 24 0S0 10.7 0 24V64 350.5 400v88c0 13.3 10.7 24 24 24s24-10.7 24-24V388.9c47.3-17.7 99.1-22.1 150.7-12.2c41.2 8 84.3 5.5 123.5-7.2c19.5-6.3 34.8-22 40.5-41.6l23.2-77.6c5.8-19.4-1.2-40.2-17.4-52.1L329.6 152c-12.9-9.5-17.1-26.8-10.2-41.2l23.2-52.8c7-15.9 .7-34.4-14.5-42.7C277.1 4 229.3-4.9 183.8 7.5L120.8 25c-23.4 6.5-44.6 18.4-62.1 34.5L48 24zm0 77.5c17.6-18.3 40.7-31.3 66.1-38.3l63-17.5c38.2-10.6 78.5-3 110.6 20.6L248.8 87c-11.8 26.7-4.8 57.9 17 76.8l57.8 46.6c8.1 6.6 11.6 17.1 8.9 27l-23.2 77.6c-2.9 9.6-10.5 17-20.2 20.1c-34.3 11.1-71.3 13.2-107.3 6.2c-35.4-6.8-72-5.9-107.8 2.9V101.5z'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 448 512'%3E%3Cpath d='M48 24C48 10.7 37.3 0 24 0S0 10.7 0 24V64 350.5 400v88c0 13.3 10.7 24 24 24s24-10.7 24-24V388.9c47.3-17.7 99.1-22.1 150.7-12.2c41.2 8 84.3 5.5 123.5-7.2c19.5-6.3 34.8-22 40.5-41.6l23.2-77.6c5.8-19.4-1.2-40.2-17.4-52.1L329.6 152c-12.9-9.5-17.1-26.8-10.2-41.2l23.2-52.8c7-15.9 .7-34.4-14.5-42.7C277.1 4 229.3-4.9 183.8 7.5L120.8 25c-23.4 6.5-44.6 18.4-62.1 34.5L48 24zm0 77.5c17.6-18.3 40.7-31.3 66.1-38.3l63-17.5c38.2-10.6 78.5-3 110.6 20.6L248.8 87c-11.8 26.7-4.8 57.9 17 76.8l57.8 46.6c8.1 6.6 11.6 17.1 8.9 27l-23.2 77.6c-2.9 9.6-10.5 17-20.2 20.1c-34.3 11.1-71.3 13.2-107.3 6.2c-35.4-6.8-72-5.9-107.8 2.9V101.5z'/%3E%3C/svg%3E");
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-position: center;
    mask-position: center;
}

/* fa fa-lock - 锁图标 */
.fa-lock::before,
.fas.fa-lock::before {
    content: '';
    display: inline-block;
    width: 1em;
    height: 1em;
    background-color: currentColor;
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 448 512'%3E%3Cpath d='M144 144v48H304V144c0-44.2-35.8-80-80-80s-80 35.8-80 80zM80 192V144C80 64.5 144.5 0 224 0s144 64.5 144 144v48h16c35.3 0 64 28.7 64 64V448c0 35.3-28.7 64-64 64H64c-35.3 0-64-28.7-64-64V256c0-35.3 28.7-64 64-64H80z'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 448 512'%3E%3Cpath d='M144 144v48H304V144c0-44.2-35.8-80-80-80s-80 35.8-80 80zM80 192V144C80 64.5 144.5 0 224 0s144 64.5 144 144v48h16c35.3 0 64 28.7 64 64V448c0 35.3-28.7 64-64 64H64c-35.3 0-64-28.7-64-64V256c0-35.3 28.7-64 64-64H80z'/%3E%3C/svg%3E");
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-position: center;
    mask-position: center;
}

/* fa fa-star - 星星图标 */
.fa-star::before,
.fas.fa-star::before {
    content: '';
    display: inline-block;
    width: 1em;
    height: 1em;
    background-color: currentColor;
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 576 512'%3E%3Cpath d='M316.9 18C311.6 7 300.4 0 288.1 0s-23.4 7-28.8 18L195 150.3 51.4 171.5c-12 1.8-22 10.2-25.7 21.7s-.7 24.2 7.9 32.7L137.8 329 113.2 474.7c-2 12 3 24.2 11.7 32.3s21.6 10.6 33.1 5.6l128.8-67.9 128.8 67.9c11.5 5 24.2 3 33.1-5.6s13.7-20.3 11.7-32.3l-24.6-145.7L542.4 215.9c8.6-8.5 11.7-21.2 7.9-32.7s-13.7-19.9-25.7-21.7L381.2 150.3 316.9 18z'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 576 512'%3E%3Cpath d='M316.9 18C311.6 7 300.4 0 288.1 0s-23.4 7-28.8 18L195 150.3 51.4 171.5c-12 1.8-22 10.2-25.7 21.7s-.7 24.2 7.9 32.7L137.8 329 113.2 474.7c-2 12 3 24.2 11.7 32.3s21.6 10.6 33.1 5.6l128.8-67.9 128.8 67.9c11.5 5 24.2 3 33.1-5.6s13.7-20.3 11.7-32.3l-24.6-145.7L542.4 215.9c8.6-8.5 11.7-21.2 7.9-32.7s-13.7-19.9-25.7-21.7L381.2 150.3 316.9 18z'/%3E%3C/svg%3E");
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-position: center;
    mask-position: center;
}

/* ========== 其他页面图标（使用mask实现颜色继承） ========== */

/* fas fa-envelope - 邮件图标 */
.fa-envelope::before,
.fas.fa-envelope::before {
    content: '';
    display: inline-block;
    width: 1em;
    height: 1em;
    background-color: currentColor;
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'%3E%3Cpath d='M48 64C21.5 64 0 85.5 0 112c0 15.1 7.1 29.3 19.2 38.4L236.8 313.6c11.4 8.5 27 8.5 38.4 0L492.8 150.4c12.1-9.1 19.2-23.3 19.2-38.4c0-26.5-21.5-48-48-48H48zM0 176V384c0 35.3 28.7 64 64 64H448c35.3 0 64-28.7 64-64V176L294.4 339.2c-22.8 17.1-54 17.1-76.8 0L0 176z'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'%3E%3Cpath d='M48 64C21.5 64 0 85.5 0 112c0 15.1 7.1 29.3 19.2 38.4L236.8 313.6c11.4 8.5 27 8.5 38.4 0L492.8 150.4c12.1-9.1 19.2-23.3 19.2-38.4c0-26.5-21.5-48-48-48H48zM0 176V384c0 35.3 28.7 64 64 64H448c35.3 0 64-28.7 64-64V176L294.4 339.2c-22.8 17.1-54 17.1-76.8 0L0 176z'/%3E%3C/svg%3E");
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-position: center;
    mask-position: center;
}

/* fas fa-phone - 电话图标 */
.fa-phone::before,
.fas.fa-phone::before {
    content: '';
    display: inline-block;
    width: 1em;
    height: 1em;
    background-color: currentColor;
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'%3E%3Cpath d='M164.9 24.6c-7.7-18.6-28-28.5-47.4-23.2l-88 24C12.1 30.2 0 46 0 64C0 311.4 200.6 512 448 512c18 0 33.8-12.1 38.6-29.5l24-88c5.3-19.4-4.6-39.7-23.2-47.4l-96-40c-16.3-6.8-35.2-2.1-46.3 11.6L304.7 368C234.3 334.7 177.3 277.7 144 207.3L193.3 167c13.7-11.2 18.4-30 11.6-46.3l-40-96z'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'%3E%3Cpath d='M164.9 24.6c-7.7-18.6-28-28.5-47.4-23.2l-88 24C12.1 30.2 0 46 0 64C0 311.4 200.6 512 448 512c18 0 33.8-12.1 38.6-29.5l24-88c5.3-19.4-4.6-39.7-23.2-47.4l-96-40c-16.3-6.8-35.2-2.1-46.3 11.6L304.7 368C234.3 334.7 177.3 277.7 144 207.3L193.3 167c13.7-11.2 18.4-30 11.6-46.3l-40-96z'/%3E%3C/svg%3E");
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-position: center;
    mask-position: center;
}

/* fas fa-map-marker-alt - 地址图标 */
.fa-map-marker-alt::before,
.fas.fa-map-marker-alt::before {
    content: '';
    display: inline-block;
    width: 1em;
    height: 1em;
    background-color: currentColor;
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 384 512'%3E%3Cpath d='M215.7 499.2C267 435 384 279.4 384 192C384 86 298 0 192 0S0 86 0 192c0 87.4 117 243 168.3 307.2c12.3 15.3 35.1 15.3 47.4 0zM192 128a64 64 0 1 1 0 128 64 64 0 1 1 0-128z'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 384 512'%3E%3Cpath d='M215.7 499.2C267 435 384 279.4 384 192C384 86 298 0 192 0S0 86 0 192c0 87.4 117 243 168.3 307.2c12.3 15.3 35.1 15.3 47.4 0zM192 128a64 64 0 1 1 0 128 64 64 0 1 1 0-128z'/%3E%3C/svg%3E");
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-position: center;
    mask-position: center;
}

/* fas fa-video - 视频图标 */
.fa-video::before,
.fas.fa-video::before {
    content: '';
    display: inline-block;
    width: 1em;
    height: 1em;
    background-color: currentColor;
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 576 512'%3E%3Cpath d='M0 128C0 92.7 28.7 64 64 64H320c35.3 0 64 28.7 64 64V384c0 35.3-28.7 64-64 64H64c-35.3 0-64-28.7-64-64V128zM559.1 99.8c10.4 5.6 16.9 16.4 16.9 28.2V384c0 11.8-6.5 22.6-16.9 28.2s-23 5-32.9-1.6l-96-64L416 337.1V320 192 174.9l14.2-9.5 96-64c9.8-6.5 22.4-7.2 32.9-1.6z'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 576 512'%3E%3Cpath d='M0 128C0 92.7 28.7 64 64 64H320c35.3 0 64 28.7 64 64V384c0 35.3-28.7 64-64 64H64c-35.3 0-64-28.7-64-64V128zM559.1 99.8c10.4 5.6 16.9 16.4 16.9 28.2V384c0 11.8-6.5 22.6-16.9 28.2s-23 5-32.9-1.6l-96-64L416 337.1V320 192 174.9l14.2-9.5 96-64c9.8-6.5 22.4-7.2 32.9-1.6z'/%3E%3C/svg%3E");
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-position: center;
    mask-position: center;
}

/* fas fa-play - 播放图标 */
.fa-play::before,
.fas.fa-play::before {
    content: '';
    display: inline-block;
    width: 1em;
    height: 1em;
    background-color: currentColor;
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 384 512'%3E%3Cpath d='M73 39c-14.8-9.1-33.4-9.4-48.5-.9S0 62.6 0 80V432c0 17.4 9.4 33.4 24.5 41.9s33.7 8.1 48.5-.9L361 297c14.3-8.8 23-24.2 23-41s-8.7-32.2-23-41L73 39z'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 384 512'%3E%3Cpath d='M73 39c-14.8-9.1-33.4-9.4-48.5-.9S0 62.6 0 80V432c0 17.4 9.4 33.4 24.5 41.9s33.7 8.1 48.5-.9L361 297c14.3-8.8 23-24.2 23-41s-8.7-32.2-23-41L73 39z'/%3E%3C/svg%3E");
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-position: center;
    mask-position: center;
}

/* fas fa-spinner - 加载动画图标 */
.fa-spinner::before,
.fas.fa-spinner::before {
    content: '';
    display: inline-block;
    width: 1em;
    height: 1em;
    background-color: currentColor;
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'%3E%3Cpath d='M304 48a48 48 0 1 0 -96 0 48 48 0 1 0 96 0zm0 416a48 48 0 1 0 -96 0 48 48 0 1 0 96 0zM48 304a48 48 0 1 0 0-96 48 48 0 1 0 0 96zm464-48a48 48 0 1 0 -96 0 48 48 0 1 0 96 0zM142.9 142.9a48 48 0 1 0 -67.9-67.9 48 48 0 1 0 67.9 67.9zm0 226.2a48 48 0 1 0 -67.9 67.9 48 48 0 1 0 67.9-67.9zM369.1 142.9a48 48 0 1 0 67.9-67.9 48 48 0 1 0 -67.9 67.9zm0 226.2a48 48 0 1 0 67.9 67.9 48 48 0 1 0 -67.9-67.9z'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'%3E%3Cpath d='M304 48a48 48 0 1 0 -96 0 48 48 0 1 0 96 0zm0 416a48 48 0 1 0 -96 0 48 48 0 1 0 96 0zM48 304a48 48 0 1 0 0-96 48 48 0 1 0 0 96zm464-48a48 48 0 1 0 -96 0 48 48 0 1 0 96 0zM142.9 142.9a48 48 0 1 0 -67.9-67.9 48 48 0 1 0 67.9 67.9zm0 226.2a48 48 0 1 0 -67.9 67.9 48 48 0 1 0 67.9-67.9zM369.1 142.9a48 48 0 1 0 67.9-67.9 48 48 0 1 0 -67.9 67.9zm0 226.2a48 48 0 1 0 67.9 67.9 48 48 0 1 0 -67.9-67.9z'/%3E%3C/svg%3E");
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-position: center;
    mask-position: center;
    animation: fa-spin 1s linear infinite;
}

/* fas fa-exclamation-circle - 警告图标 */
.fa-exclamation-circle::before,
.fas.fa-exclamation-circle::before {
    content: '';
    display: inline-block;
    width: 1em;
    height: 1em;
    background-color: currentColor;
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'%3E%3Cpath d='M256 512A256 256 0 1 0 256 0a256 256 0 1 0 0 512zm0-384c13.3 0 24 10.7 24 24V264c0 13.3-10.7 24-24 24s-24-10.7-24-24V152c0-13.3 10.7-24 24-24zM224 352a32 32 0 1 1 64 0 32 32 0 1 1 -64 0z'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'%3E%3Cpath d='M256 512A256 256 0 1 0 256 0a256 256 0 1 0 0 512zm0-384c13.3 0 24 10.7 24 24V264c0 13.3-10.7 24-24 24s-24-10.7-24-24V152c0-13.3 10.7-24 24-24zM224 352a32 32 0 1 1 64 0 32 32 0 1 1 -64 0z'/%3E%3C/svg%3E");
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-position: center;
    mask-position: center;
}

/* ========== 动画效果 ========== */

/* 旋转动画 */
@keyframes fa-spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.fa-spin {
    animation: fa-spin 1s linear infinite;
}

/* ========== 图标大小变体 ========== */

.fa-xs { font-size: 0.75em; }
.fa-sm { font-size: 0.875em; }
.fa-lg { font-size: 1.33333em; line-height: 0.75em; vertical-align: -0.0667em; }
.fa-2x { font-size: 2em; }
.fa-3x { font-size: 3em; }
.fa-4x { font-size: 4em; }
.fa-5x { font-size: 5em; }