/* ============================================================
   入口页（frontend/index.html）本地化样式：替代原 Tailwind CDN 与 Font Awesome CDN
   遵循白名单原则，仅包含 frontend/index.html 实际用到的类
   ============================================================ */

/* ── 基础重置（对应 Tailwind Preflight 的最小子集） ── */
*, *::before, *::after {
    box-sizing: border-box;
    border-width: 0;
    border-style: solid;
    border-color: #e5e7eb;
}
body {
    margin: 0;
    font-family: ui-sans-serif, system-ui, "Segoe UI", "Microsoft YaHei", sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: #1f2937;
}
/* 标题与段落清除默认外边距，标题字号/字重继承（由 text-*/font-* 工具类显式指定） */
h1, h2, h3, h4, h5, h6 {
    font-size: inherit;
    font-weight: inherit;
    margin: 0;
}
p { margin: 0; }
a { color: inherit; text-decoration: inherit; }
button {
    font: inherit;
    color: inherit;
    background-color: transparent;
    background-image: none;
    border: 0;
    padding: 0;
    cursor: pointer;
}

/* ── 布局与显示 ── */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.inline-block { display: inline-block; }
.grid { display: grid; }
.hidden { display: none; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.text-center { text-align: center; }
.sticky { position: sticky; }
.top-0 { top: 0; }
.z-50 { z-index: 50; }

/* ── 容器（对应 Tailwind container：各断点定宽 + mx-auto 居中） ── */
.container { width: 100%; }
.mx-auto { margin-left: auto; margin-right: auto; }
.max-w-2xl { max-width: 42rem; }
.max-w-3xl { max-width: 48rem; }

/* ── 内边距 ── */
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.px-8 { padding-left: 2rem; padding-right: 2rem; }
.py-3 { padding-top: 0.75rem; padding-bottom: 0.75rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.py-8 { padding-top: 2rem; padding-bottom: 2rem; }
.py-16 { padding-top: 4rem; padding-bottom: 4rem; }
.py-20 { padding-top: 5rem; padding-bottom: 5rem; }
.p-7 { padding: 1.75rem; }
.p-10 { padding: 2.5rem; }

/* ── 外边距与间距 ── */
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-5 { margin-bottom: 1.25rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-12 { margin-bottom: 3rem; }
.ml-2 { margin-left: 0.5rem; }
.gap-2 { gap: 0.5rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }

/* ── 尺寸 ── */
.w-12 { width: 3rem; }
.h-12 { height: 3rem; }
.w-14 { width: 3.5rem; }
.h-14 { height: 3.5rem; }

/* ── 字体 ── */
.font-sans { font-family: ui-sans-serif, system-ui, "Segoe UI", "Microsoft YaHei", sans-serif; }
.text-lg { font-size: 1.125rem; line-height: 1.75rem; }
.text-xl { font-size: 1.25rem; line-height: 1.75rem; }
.text-2xl { font-size: 1.5rem; line-height: 2rem; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
/* 首屏大标题：替代原 text-[clamp(2rem,5vw,3.2rem)] 任意值类 */
.hero-title { font-size: clamp(2rem, 5vw, 3.2rem); }

/* ── 文字颜色 ── */
.text-white { color: #ffffff; }
.text-gray-300 { color: #d1d5db; }
.text-gray-500 { color: #6b7280; }
.text-gray-600 { color: #4b5563; }
.text-primary { color: #2563eb; }
.text-dark { color: #1e293b; }

/* ── 背景颜色 ── */
.bg-white { background-color: #ffffff; }
.bg-gray-50 { background-color: #f9fafb; }
.bg-blue-100 { background-color: #dbeafe; }
.bg-dark { background-color: #1e293b; }
/* 首屏 Banner 渐变：替代原 bg-gradient-to-br from-primary to-blue-700 */
.banner-gradient { background-image: linear-gradient(to bottom right, #2563eb, #1d4ed8); }

/* ── 边框与圆角 ── */
.border { border-width: 1px; }
.border-gray-100 { border-color: #f3f4f6; }
.rounded-lg { border-radius: 0.5rem; }
.rounded-xl { border-radius: 0.75rem; }
.rounded-2xl { border-radius: 1rem; }
.rounded-full { border-radius: 9999px; }

/* ── 阴影与透明度 ── */
.shadow-sm { box-shadow: 0 1px 2px 0 rgb(0 0 0 / 0.05); }
.opacity-90 { opacity: 0.9; }

/* ── 过渡与 hover 变体 ── */
.transition-colors {
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out;
}
.hover\:text-primary:hover { color: #2563eb; }
.hover\:bg-blue-50:hover { background-color: #eff6ff; }

/* ── 自定义工具类（对应原 @layer utilities 中的定义） ── */
.text-shadow { text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1); }
.card-hover { transition: all 0.3s ease; }
.card-hover:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(37, 99, 235, 0.15);
}

/* ── 响应式（md ≥ 768px） ── */
@media (min-width: 768px) {
    .md\:flex { display: flex; }
    .md\:hidden { display: none; }
    .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .md\:py-24 { padding-top: 6rem; padding-bottom: 6rem; }
    .md\:py-28 { padding-top: 7rem; padding-bottom: 7rem; }
    .md\:text-xl { font-size: 1.25rem; line-height: 1.75rem; }
    .md\:text-3xl { font-size: 1.875rem; line-height: 2.25rem; }
}

/* ── container 各断点定宽（对应 Tailwind container 行为） ── */
@media (min-width: 640px) { .container { max-width: 640px; } }
@media (min-width: 768px) { .container { max-width: 768px; } }
@media (min-width: 1024px) { .container { max-width: 1024px; } }
@media (min-width: 1280px) { .container { max-width: 1280px; } }
@media (min-width: 1536px) { .container { max-width: 1536px; } }

/* ============================================================
   图标（mask 方案：颜色跟随 currentColor，可随 text-* 变色）
   替代原 Font Awesome，全部图标统一沿用 Font Awesome Free Solid 路径，风格一致
   ============================================================ */
.icon {
    display: inline-block;
    width: 1em;
    height: 1em;
    background-color: currentColor;
    vertical-align: -0.125em;
    -webkit-mask-image: var(--icon-img);
    mask-image: var(--icon-img);
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-position: center;
    mask-position: center;
}
/* 文件（页首 logo，对应 fa-file-powerpoint-o） */
.icon-file-powerpoint {
    --icon-img: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 384 512'%3E%3Cpath d='M0 64C0 28.7 28.7 0 64 0H224V128c0 17.7 14.3 32 32 32H384V448c0 35.3-28.7 64-64 64H64c-35.3 0-64-28.7-64-64V64zm384 64H256V0L384 128z'/%3E%3C/svg%3E");
}
/* 汉堡菜单（对应 fa-bars） */
.icon-bars {
    --icon-img: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 448 512'%3E%3Cpath d='M0 96C0 78.3 14.3 64 32 64H416c17.7 0 32 14.3 32 32s-14.3 32-32 32H32C14.3 128 0 113.7 0 96zM0 256c0-17.7 14.3-32 32-32H416c17.7 0 32 14.3 32 32s-14.3 32-32 32H32c-17.7 0-32-14.3-32-32zM448 416c0 17.7-14.3 32-32 32H32c-17.7 0-32-14.3-32-32s14.3-32 32-32H416c17.7 0 32 14.3 32 32z'/%3E%3C/svg%3E");
}
/* 右箭头（对应 fa-arrow-right） */
.icon-arrow-right {
    --icon-img: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 448 512'%3E%3Cpath d='M438.6 278.6c12.5-12.5 12.5-32.8 0-45.3l-160-160c-12.5-12.5-32.8-12.5-45.3 0s-12.5 32.8 0 45.3L338.8 224 32 224c-17.7 0-32 14.3-32 32s14.3 32 32 32l306.7 0L233.4 393.4c-12.5 12.5-12.5 32.8 0 45.3s32.8 12.5 45.3 0l160-160z'/%3E%3C/svg%3E");
}
/* 魔法棒星芒（AI 智能生成，对应 fa-magic / wand-magic-sparkles） */
.icon-magic {
    --icon-img: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 576 512'%3E%3Cpath d='M234.7 42.7L197 56.8c-3 1.1-5 4-5 7.2s2 6.1 5 7.2l37.7 14.1L248.8 123c1.1 3 4 5 7.2 5s6.1-2 7.2-5l14.1-37.7L315 71.2c3-1.1 5-4 5-7.2s-2-6.1-5-7.2L277.3 42.7 263.2 5c-1.1-3-4-5-7.2-5s-6.1 2-7.2 5L234.7 42.7zM46.1 395.4c-18.7 18.7-18.7 49.1 0 67.9l34.6 34.6c18.7 18.7 49.1 18.7 67.9 0L529.9 116.5c18.7-18.7 18.7-49.1 0-67.9L495.3 14.1c-18.7-18.7-49.1-18.7-67.9 0L46.1 395.4zM484.6 82.6l-105 105-23.3-23.3 105-105 23.3 23.3zM7.5 117.2C3 118.9 0 123.2 0 128s3 9.1 7.5 10.8L64 160l21.2 56.5c1.7 4.5 6 7.5 10.8 7.5s9.1-3 10.8-7.5L128 160l56.5-21.2c4.5-1.7 7.5-6 7.5-10.8s-3-9.1-7.5-10.8L128 96 106.8 39.5C105.1 35 100.8 32 96 32s-9.1 3-10.8 7.5L64 96 7.5 117.2zm352 256c-4.5 1.7-7.5 6-7.5 10.8s3 9.1 7.5 10.8L416 416l21.2 56.5c1.7 4.5 6 7.5 10.8 7.5s9.1-3 10.8-7.5L480 416l56.5-21.2c4.5-1.7 7.5-6 7.5-10.8s-3-9.1-7.5-10.8L480 352l-21.2-56.5c-1.7-4.5-6-7.5-10.8-7.5s-9.1 3-10.8 7.5L416 352l-56.5 21.2z'/%3E%3C/svg%3E");
}
/* 调节滑杆（个性化配置，对应 fa-sliders） */
.icon-sliders {
    --icon-img: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'%3E%3Cpath d='M0 416c0 17.7 14.3 32 32 32l54.7 0c12.3 28.3 40.5 48 73.3 48s61-19.7 73.3-48L480 448c17.7 0 32-14.3 32-32s-14.3-32-32-32l-246.7 0c-12.3-28.3-40.5-48-73.3-48s-61 19.7-73.3 48L32 384c-17.7 0-32 14.3-32 32zm128 0a32 32 0 1 1 64 0 32 32 0 1 1 -64 0zM320 256a32 32 0 1 1 64 0 32 32 0 1 1 -64 0zm32-80c-32.8 0-61 19.7-73.3 48L32 224c-17.7 0-32 14.3-32 32s14.3 32 32 32l246.7 0c12.3 28.3 40.5 48 73.3 48s61-19.7 73.3-48l54.7 0c17.7 0 32-14.3 32-32s-14.3-32-32-32l-54.7 0c-12.3-28.3-40.5-48-73.3-48zM192 128a32 32 0 1 1 0-64 32 32 0 1 1 0 64zm73.3-64C253 35.7 224.8 16 192 16s-61 19.7-73.3 48L32 64C14.3 64 0 78.3 0 96s14.3 32 32 32l86.7 0c12.3 28.3 40.5 48 73.3 48s61-19.7 73.3-48L480 128c17.7 0 32-14.3 32-32s-14.3-32-32-32L265.3 64z'/%3E%3C/svg%3E");
}
/* 文本文件（文档生成，对应 fa-file-text-o） */
.icon-file-text {
    --icon-img: 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");
}
/* 方框铅笔（内容编辑调整，对应 fa-pencil-square-o / pen-to-square） */
.icon-pencil {
    --icon-img: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'%3E%3Cpath d='M471.6 21.7c-21.9-21.9-57.3-21.9-79.2 0L362.3 51.7l97.9 97.9 30.1-30.1c21.9-21.9 21.9-57.3 0-79.2L471.6 21.7zm-299.2 220c-6.1 6.1-10.8 13.6-13.5 21.9l-29.6 88.8c-2.9 8.6-.6 18.1 5.8 24.6s15.9 8.7 24.6 5.8l88.8-29.6c8.2-2.7 15.7-7.4 21.9-13.5L437.7 172.3 339.7 74.3 172.4 241.7zM96 64C43 64 0 107 0 160L0 416c0 53 43 96 96 96l256 0c53 0 96-43 96-96l0-96c0-17.7-14.3-32-32-32s-32 14.3-32 32l0 96c0 17.7 14.3 32-32 32L96 448c-17.7 0-32-14.3-32-32l0-256c0-17.7 14.3-32 32-32l96 0c17.7 0 32-14.3 32-32s-14.3-32-32-32L96 64z'/%3E%3C/svg%3E");
}
/* 四方格（多种风格模版，对应 fa-th-large） */
.icon-grid {
    --icon-img: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'%3E%3Cpath d='M32 32h192v192H32zM288 32h192v192H288zM32 288h192v192H32zM288 288h192v192H288z'/%3E%3C/svg%3E");
}
/* 下载（导出 PPT 文件，对应 fa-download） */
.icon-download {
    --icon-img: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'%3E%3Cpath d='M288 32c0-17.7-14.3-32-32-32s-32 14.3-32 32V274.7l-73.4-73.4c-12.5-12.5-32.8-12.5-45.3 0s-12.5 32.8 0 45.3l128 128c12.5 12.5 32.8 12.5 45.3 0l128-128c12.5-12.5 12.5-32.8 0-45.3s-32.8-12.5-45.3 0L288 274.7V32zM64 352c-35.3 0-64 28.7-64 64v32c0 35.3 28.7 64 64 64H448c35.3 0 64-28.7 64-64V416c0-35.3-28.7-64-64-64H346.5l-45.3 45.3c-25 25-65.5 25-90.5 0L165.5 352H64zm368 56a24 24 0 1 1 0 48 24 24 0 1 1 0-48z'/%3E%3C/svg%3E");
}
/* 信封（电子邮箱，对应 fa-envelope） */
.icon-envelope {
    --icon-img: 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");
}
/* 电话（联系电话，对应 fa-phone） */
.icon-phone {
    --icon-img: 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");
}
/* 定位（公司地址，对应 fa-map-marker） */
.icon-map-marker {
    --icon-img: 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");
}