*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 14px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    min-height: 100vh;
}

a {
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

input, select, textarea, button {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    outline: none;
}

table {
    border-collapse: collapse;
    width: 100%;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
}

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    border-radius: 3px;
}

.d-flex { display: flex; }
.d-inline-flex { display: inline-flex; }
.d-block { display: block; }
.d-none { display: none; }
.d-grid { display: grid; }

.flex-row { flex-direction: row; }
.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }
.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.align-start { align-items: flex-start; }
.align-center { align-items: center; }
.align-end { align-items: flex-end; }
.align-stretch { align-items: stretch; }
.flex-1 { flex: 1; }
.flex-shrink-0 { flex-shrink: 0; }
.gap-4 { gap: 4px; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.gap-20 { gap: 20px; }
.gap-24 { gap: 24px; }

.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.font-bold { font-weight: 700; }
.font-normal { font-weight: 400; }
.text-ellipsis { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.text-break { word-break: break-all; }

.m-0 { margin: 0; }
.mt-4 { margin-top: 4px; }
.mt-8 { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.mt-20 { margin-top: 20px; }
.mt-24 { margin-top: 24px; }
.mb-4 { margin-bottom: 4px; }
.mb-8 { margin-bottom: 8px; }
.mb-12 { margin-bottom: 12px; }
.mb-16 { margin-bottom: 16px; }
.mb-20 { margin-bottom: 20px; }
.mb-24 { margin-bottom: 24px; }
.ml-4 { margin-left: 4px; }
.ml-8 { margin-left: 8px; }
.ml-12 { margin-left: 12px; }
.ml-16 { margin-left: 16px; }
.mr-4 { margin-right: 4px; }
.mr-8 { margin-right: 8px; }
.mr-12 { margin-right: 12px; }
.mr-16 { margin-right: 16px; }
.mx-auto { margin-left: auto; margin-right: auto; }

.p-0 { padding: 0; }
.p-4 { padding: 4px; }
.p-8 { padding: 8px; }
.p-12 { padding: 12px; }
.p-16 { padding: 16px; }
.p-20 { padding: 20px; }
.p-24 { padding: 24px; }
.pt-4 { padding-top: 4px; }
.pt-8 { padding-top: 8px; }
.pt-12 { padding-top: 12px; }
.pt-16 { padding-top: 16px; }
.pb-4 { padding-bottom: 4px; }
.pb-8 { padding-bottom: 8px; }
.pb-12 { padding-bottom: 12px; }
.pb-16 { padding-bottom: 16px; }
.px-8 { padding-left: 8px; padding-right: 8px; }
.px-12 { padding-left: 12px; padding-right: 12px; }
.px-16 { padding-left: 16px; padding-right: 16px; }
.py-4 { padding-top: 4px; padding-bottom: 4px; }
.py-8 { padding-top: 8px; padding-bottom: 8px; }
.py-12 { padding-top: 12px; padding-bottom: 12px; }

.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }
.overflow-x-auto { overflow-x: auto; }
.overflow-y-auto { overflow-y: auto; }

.position-relative { position: relative; }
.position-absolute { position: absolute; }
.position-fixed { position: fixed; }
.position-sticky { position: sticky; }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

.cursor-pointer { cursor: pointer; }
.user-select-none { user-select: none; }

.transition-all {
    transition: all 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

.fade-in { animation: fadeIn 0.3s ease; }
.fade-out { animation: fadeOut 0.3s ease; }

.clearfix::after {
    content: '';
    display: table;
    clear: both;
}