/* ===== 设计系统 token ===== */
:root {
    /* 颜色语义 token */
    --color-primary: #1E3A8A;
    --color-on-primary: #FFFFFF;
    --color-secondary: #3B82F6;
    --color-accent: #7C3AED;
    --color-background: #F8FAFC;
    --color-surface: #FFFFFF;
    --color-foreground: #1E40AF;
    --color-text: #172554;
    --color-text-secondary: #475569;
    --color-muted: #E9EEF5;
    --color-border: #BFDBFE;
    --color-ring: #1E3A8A;
    --color-danger: #DC2626;
    /* 字体 */
    --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
    /* 间距 4/8 体系 */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-6: 24px;
    --space-8: 32px;
    --space-12: 48px;
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(30, 58, 138, 0.08);
    --shadow-md: 0 6px 16px rgba(30, 58, 138, 0.12);
    /* 动效 */
    --transition-fast: 200ms ease-out;
    /* 布局 */
    --container-max: 1080px;
    /* 用户信息区最小宽度(可调,当前渲染宽度约值) */
    --user-info-min-width: 600px;
}

/* ===== 基础重置 ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* hidden 属性始终生效,避免被布局类 display 声明覆盖 */
[hidden] {
    display: none !important;
}

/* 隐藏浏览器侧边滚动条 */
html {
    scrollbar-width: none;
}
html::-webkit-scrollbar {
    display: none;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

/* 顶部渐变装饰条 */
body::before {
    content: "";
    display: block;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary), var(--color-accent));
}

/* 链接与焦点可见 */
a {
    color: var(--color-primary);
}
a:hover {
    color: var(--color-accent);
}
:focus-visible {
    outline: 2px solid var(--color-ring);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* 仅屏幕阅读器可见 */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 通用图标 */
.icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* ===== 面包屑导航 ===== */
.site-header {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}
.breadcrumb ol {
    list-style: none;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-2);
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--space-2) var(--space-4);
}
.breadcrumb li {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    min-height: 44px;
    font-size: 14px;
    color: var(--color-text-secondary);
}
.breadcrumb li + li::before {
    content: "";
    width: 6px;
    height: 6px;
    border-right: 2px solid var(--color-border);
    border-bottom: 2px solid var(--color-border);
    transform: rotate(45deg);
    margin-right: var(--space-2);
}
.breadcrumb a {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast), background-color var(--transition-fast);
}
.breadcrumb a:hover {
    background-color: var(--color-muted);
}
.breadcrumb li[aria-current="page"] {
    font-weight: 600;
    color: var(--color-primary);
}

/* ===== 容器与 Hero ===== */
.container {
    flex: 1;
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--space-12) var(--space-4) var(--space-8);
}
.hero {
    margin-bottom: var(--space-12);
}
.hero h1 {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--color-foreground);
}
.hero-accent {
    color: var(--color-accent);
}
.hero-desc {
    margin-top: var(--space-4);
    max-width: 60ch;
    font-size: 18px;
    color: var(--color-text-secondary);
}

/* ===== 用户切换表单 ===== */
.user-form {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-6);
    max-width: 560px;
}
.user-form input {
    flex: 1;
    min-width: 0;
    height: 48px;
    padding: 0 var(--space-4);
    font-family: inherit;
    font-size: 16px;
    color: var(--color-text);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.user-form input:focus-visible {
    outline: none;
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}
.user-form input::placeholder {
    color: var(--color-text-secondary);
}
.user-form button {
    height: 48px;
    padding: 0 var(--space-6);
    font-family: inherit;
    font-size: 16px;
    font-weight: 600;
    color: var(--color-on-primary);
    background-color: var(--color-primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}
.user-form button:hover {
    background-color: var(--color-foreground);
}
.user-form button:active {
    transform: scale(0.98);
}
.user-form button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===== 用户信息 ===== */
.user-info {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
    margin-top: var(--space-6);
    padding: var(--space-4);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    width: fit-content;
    min-width: min(var(--user-info-min-width), 100%);
    max-width: 100%;
}
.user-info img {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    border: 2px solid var(--color-border);
    flex-shrink: 0;
}
.user-info-body {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}
.user-info-name {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color var(--transition-fast);
}
.user-info-name:hover {
    color: var(--color-accent);
}
.user-info-avatar {
    display: block;
    flex-shrink: 0;
    line-height: 0;
    border-radius: 50%;
    transition: box-shadow var(--transition-fast);
}
.user-info-avatar:hover {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}
.user-info-login {
    font-size: 14px;
    color: var(--color-text-secondary);
}
.user-info-main {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}
.user-info-top {
    min-width: 0;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
}
.user-info-stats {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
}
.user-info-social {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}
.user-info-count,
.user-info-star,
.user-info-following,
.user-info-followers {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary);
}
.user-info-count .icon,
.user-info-star .icon,
.user-info-following .icon,
.user-info-followers .icon {
    width: 16px;
    height: 16px;
}
.user-info-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}
.user-info-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
    transition: border-color var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
}
.user-info-link:hover {
    border-color: var(--color-secondary);
    background-color: var(--color-muted);
    color: var(--color-primary);
}
.user-info-link .icon {
    width: 16px;
    height: 16px;
}

/* ===== 分类区块 ===== */
.category {
    margin-bottom: var(--space-12);
}
.category h2 {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
    font-size: 24px;
    font-weight: 600;
    color: var(--color-foreground);
}
.category h2::before {
    content: "";
    width: 6px;
    height: 24px;
    border-radius: var(--radius-sm);
    background: linear-gradient(180deg, var(--color-secondary), var(--color-accent));
}

/* ===== 仓库工具条 ===== */
.repo-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}
.repo-toolbar h2 {
    margin-bottom: 0;
}
.repo-sort {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 14px;
    color: var(--color-text-secondary);
}
.repo-sort select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    height: 36px;
    padding: 0 var(--space-6);
    font-family: inherit;
    font-size: 14px;
    color: var(--color-text);
    text-align: center;
    background-color: var(--color-surface);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23475569' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-2) center;
    background-size: 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.repo-sort select:focus-visible {
    outline: none;
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}
.repo-sort select option {
    text-align: center;
}

/* ===== 仓库卡片列表 ===== */
.repo-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-4);
}
@media (min-width: 900px) {
    .repo-list {
        grid-template-columns: repeat(2, 1fr);
    }
}
.repo-card {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    padding: var(--space-4);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}
.repo-head {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    min-width: 0;
}
.repo-name {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color var(--transition-fast);
}
.repo-name:hover {
    color: var(--color-accent);
}
.repo-link-icon {
    width: 16px;
    height: 16px;
    color: var(--color-text-secondary);
    flex-shrink: 0;
}
.repo-desc {
    font-size: 14px;
    color: var(--color-text-secondary);
    overflow-wrap: break-word;
}
.repo-desc:empty {
    display: none;
}
.repo-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
    font-size: 13px;
    color: var(--color-text-secondary);
}
.repo-meta span {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
}
.repo-meta .icon {
    width: 14px;
    height: 14px;
}
.repo-meta .lang-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--color-secondary);
    flex-shrink: 0;
}
.repo-readme {
    padding: var(--space-3) var(--space-4);
    background-color: var(--color-background);
    border-radius: var(--radius-md);
    font-size: 13px;
    line-height: 1.6;
    color: var(--color-text-secondary);
    overflow-wrap: break-word;
}
.repo-readme-label {
    display: block;
    margin-bottom: var(--space-1);
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.repo-readme-empty {
    color: var(--color-text-secondary);
    opacity: 0.8;
}

/* ===== 骨架屏 ===== */
.skeleton {
    position: relative;
    overflow: hidden;
    background-color: var(--color-muted);
    border-radius: var(--radius-sm);
}
.skeleton::after {
    content: "";
    position: absolute;
    inset: 0;
    transform: translateX(-100%);
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.6), transparent);
    animation: skeleton-shimmer 1.4s infinite;
}
@keyframes skeleton-shimmer {
    100% {
        transform: translateX(100%);
    }
}
.skeleton-card {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    padding: var(--space-4);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}
.skeleton-line {
    height: 16px;
}
.skeleton-line.short {
    width: 40%;
}
.skeleton-line.medium {
    width: 70%;
}

/* ===== 状态提示 ===== */
.state-box {
    padding: var(--space-12) var(--space-4);
    background-color: var(--color-surface);
    border: 1px dashed var(--color-border);
    border-radius: var(--radius-lg);
    text-align: center;
    color: var(--color-text-secondary);
}
.state-box .state-title {
    display: block;
    margin-bottom: var(--space-2);
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
}
.state-box.state-error .state-title {
    color: var(--color-danger);
}
.state-box .state-detail {
    font-size: 14px;
}

/* ===== 页脚 ===== */
.site-footer {
    border-top: 1px solid var(--color-border);
    background-color: var(--color-surface);
    padding: var(--space-6) var(--space-4);
    text-align: center;
    font-size: 14px;
    color: var(--color-text-secondary);
}
.site-footer a {
    font-weight: 500;
    text-decoration: none;
}

/* ===== 加载进度条(页面顶部,从左到右) ===== */
.loading-bar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, #22C55E, #4ADE80);
    border-radius: 0 2px 2px 0;
    transition: width 1s linear, opacity 300ms ease-out;
}
.loading-bar.loading {
    width: 100%;
}
.loading-bar.hide {
    opacity: 0;
}

/* ===== 自定义飘窗 ===== */
.toast-container {
    position: fixed;
    top: var(--space-4);
    left: 50%;
    transform: translateX(-50%);
    z-index: 1001;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    max-width: calc(100vw - 32px);
}
.toast {
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-md);
    background-color: var(--color-text);
    color: #FFFFFF;
    font-size: 14px;
    font-weight: 500;
    box-shadow: var(--shadow-md);
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}
.toast-show {
    opacity: 1;
    transform: translateY(0);
}
.toast-hide {
    opacity: 0;
    transform: translateY(-8px);
}
.toast-error {
    background-color: var(--color-danger);
}
.toast-info {
    background-color: var(--color-primary);
}

/* ===== 动效偏好 ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
    .skeleton::after {
        animation: none;
    }
}