/* ============================================
   公用工程知识库 - 全局样式
   移动端优先设计
   ============================================ */

/* ===== CSS变量 ===== */
:root {
    /* 主色 */
    --primary: #4F6F8F;
    --primary-light: #E8EEF5;
    --primary-dark: #2C3E50;
    --primary-hover: #3A5A7A;

    /* 功能色 */
    --accent: #D4A574;
    --success: #5B8C5A;
    --warning: #D4A050;
    --danger: #B55A5A;
    --danger-hover: #8A3A3A;

    /* 灰度 */
    --bg: #F7F8FA;
    --card: #FFFFFF;
    --text: #2D2D2D;
    --text-secondary: #6B7A8A;
    --text-light: #9AABBC;
    --border: #E8ECF0;
    --shadow: rgba(0, 0, 0, 0.06);
    --shadow-hover: rgba(0, 0, 0, 0.12);

    /* 圆角 */
    --radius: 12px;
    --radius-sm: 8px;
    --radius-full: 9999px;

    /* 字体 */
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    --font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", "Consolas", monospace;

    /* 间距 */
    --header-height: 56px;
    --max-width: 1200px;
}


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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    padding-top: var(--header-height);
    padding-bottom: 60px;
}

a {
    color: var(--primary);
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
}


/* ===== 布局 ===== */
#app {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 12px;
}

#app-main {
    min-height: calc(100vh - var(--header-height) - 120px);
}


/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    background: var(--card);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 12px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.header-logo {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-dark);
    display: flex;
    align-items: center;
    gap: 6px;
}

.header-logo span {
    font-size: 20px;
}

.header-center {
    flex: 1;
    max-width: 480px;
    margin: 0 12px;
}

.header-center .search-input {
    width: 100%;
    padding: 6px 14px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-full);
    font-size: 14px;
    background: var(--bg);
    transition: all 0.2s;
    outline: none;
}

.header-center .search-input:focus {
    border-color: var(--primary);
    background: var(--card);
    box-shadow: 0 0 0 3px rgba(79, 111, 143, 0.15);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
    font-size: 14px;
}

/* 按钮 - 登录 */
.btn-login {
    color: var(--primary);
    padding: 4px 14px;
    border: 1.5px solid var(--primary);
    border-radius: var(--radius-full);
    font-weight: 500;
    transition: all 0.2s;
    background: transparent;
    font-size: 13px;
}

.btn-login:hover {
    background: var(--primary);
    color: #fff;
}

/* 按钮 - 管理后台（管理员可见） */
.btn-admin {
    background: var(--primary);
    color: #fff;
    padding: 4px 14px;
    border-radius: var(--radius-full);
    font-weight: 500;
    font-size: 13px;
    transition: background 0.2s;
    border: none;
}

.btn-admin:hover {
    background: var(--primary-hover);
}

/* 用户昵称 */
.user-name {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 13px;
}

/* 退出按钮 */
.btn-logout {
    color: var(--danger);
    background: transparent;
    border: none;
    font-size: 13px;
    padding: 4px 8px;
    font-weight: 500;
    transition: color 0.2s;
}

.btn-logout:hover {
    color: var(--danger-hover);
}


/* ===== 分类导航 ===== */
.category-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 0 6px 0;
    background: var(--bg);
    position: sticky;
    top: var(--header-height);
    z-index: 100;
    border-bottom: 1px solid var(--border);
    margin: 0 -12px;
    padding-left: 12px;
    padding-right: 12px;
}

.category-scroll {
    display: flex;
    overflow-x: auto;
    overflow-y: hidden;
    gap: 6px;
    flex: 1;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 2px 0;
}

.category-scroll::-webkit-scrollbar {
    display: none;
}

.category-scroll a {
    flex-shrink: 0;
    padding: 4px 14px;
    font-size: 13px;
    color: var(--text-secondary);
    background: var(--card);
    border-radius: var(--radius-full);
    border: 1px solid var(--border);
    transition: all 0.2s;
    white-space: nowrap;
    font-weight: 500;
    cursor: pointer;
}

.category-scroll a:active {
    transform: scale(0.95);
}

.category-scroll a.active {
    color: #fff;
    background: var(--primary);
    border-color: var(--primary);
}

/* 极窄屏下拉菜单（默认隐藏） */
.category-select-mobile {
    display: none;
    padding: 4px 10px;
    font-size: 13px;
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    background: var(--card);
    color: var(--text);
    outline: none;
    max-width: 100px;
}

.category-select-mobile:focus {
    border-color: var(--primary);
}


/* ===== 文章卡片 ===== */
.article-card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 16px 18px;
    margin-bottom: 12px;
    box-shadow: 0 1px 4px var(--shadow);
    transition: all 0.2s;
    border: 1px solid var(--border);
}

.article-card:active {
    transform: scale(0.99);
}

.article-card .card-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-card .card-title a {
    color: var(--text);
}

.article-card .card-title a:hover {
    color: var(--primary);
}

.article-card .card-summary {
    font-size: 14px;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 8px;
}

.article-card .card-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 12px;
    font-size: 12px;
    color: var(--text-light);
}

.article-card .card-meta .category-badge {
    background: var(--primary-light);
    color: var(--primary);
    padding: 1px 10px;
    border-radius: var(--radius-full);
    font-size: 11px;
    font-weight: 500;
}

.article-card .card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 6px;
}

.article-card .card-tags .tag {
    background: #F0EDE8;
    color: #8A7A6A;
    padding: 1px 10px;
    border-radius: 4px;
    font-size: 11px;
}


/* ===== 文章详情 ===== */
.article-detail {
    max-width: 800px;
    margin: 0 auto;
    padding: 16px 0 40px 0;
}

.article-detail .detail-header {
    margin-bottom: 20px;
}

.article-detail .detail-title {
    font-size: 26px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 10px;
    color: var(--text);
}

.article-detail .detail-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 16px;
    font-size: 14px;
    color: var(--text-secondary);
}

.article-detail .detail-meta .category-badge {
    background: var(--primary-light);
    color: var(--primary);
    padding: 1px 12px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 500;
}

.article-detail .detail-body {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* 正文 Markdown 样式 */
.detail-body h1 {
    font-size: 24px;
    font-weight: 700;
    margin: 28px 0 12px 0;
}

.detail-body h2 {
    font-size: 20px;
    font-weight: 600;
    margin: 24px 0 10px 0;
    padding-bottom: 6px;
    border-bottom: 2px solid var(--border);
}

.detail-body h3 {
    font-size: 18px;
    font-weight: 600;
    margin: 20px 0 8px 0;
}

.detail-body p {
    margin-bottom: 14px;
}

.detail-body ul,
.detail-body ol {
    padding-left: 24px;
    margin-bottom: 14px;
}

.detail-body li {
    margin-bottom: 4px;
}

.detail-body img {
    max-width: 100%;
    border-radius: var(--radius-sm);
    margin: 16px 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.detail-body video {
    max-width: 100%;
    border-radius: var(--radius-sm);
    margin: 16px 0;
}

.detail-body blockquote {
    border-left: 4px solid var(--primary);
    padding-left: 16px;
    margin: 16px 0;
    color: var(--text-secondary);
    background: var(--primary-light);
    padding: 12px 16px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.detail-body pre {
    background: #1A1D23;
    padding: 16px 18px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 16px 0;
    color: #E8E8E8;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.6;
}

.detail-body code {
    font-family: var(--font-mono);
    font-size: 14px;
    background: #F0F0F0;
    padding: 1px 6px;
    border-radius: 4px;
}

.detail-body pre code {
    background: transparent;
    padding: 0;
}

.detail-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 14px;
}

.detail-body table th,
.detail-body table td {
    border: 1px solid var(--border);
    padding: 8px 12px;
    text-align: left;
}

.detail-body table th {
    background: var(--bg);
    font-weight: 600;
}

/* 上一篇/下一篇 */
.detail-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 32px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    font-size: 14px;
}

.detail-nav a {
    color: var(--text-secondary);
    max-width: 45%;
}

.detail-nav a:hover {
    color: var(--primary);
}


/* ===== 登录页 ===== */
.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - var(--header-height) - 100px);
    padding: 20px 16px;
}

.login-card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 36px 28px;
    max-width: 400px;
    width: 100%;
    box-shadow: 0 4px 20px var(--shadow-hover);
    border: 1px solid var(--border);
}

.login-card .login-logo {
    text-align: center;
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 6px;
}

.login-card .login-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 24px;
}

.login-card .form-group {
    margin-bottom: 16px;
}

.login-card .form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 4px;
}

.login-card .form-group input {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 15px;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    background: var(--bg);
}

.login-card .form-group input:focus {
    border-color: var(--primary);
    background: var(--card);
    box-shadow: 0 0 0 3px rgba(79, 111, 143, 0.12);
}

.login-card .btn-submit {
    width: 100%;
    padding: 11px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 600;
    transition: background 0.2s;
}

.login-card .btn-submit:hover {
    background: var(--primary-hover);
}

.login-card .btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.login-card .login-help {
    text-align: center;
    margin-top: 16px;
    font-size: 13px;
    color: var(--text-secondary);
}

.login-card .error-msg {
    background: #FEE8E8;
    color: var(--danger);
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    margin-bottom: 16px;
    display: none;
}

.login-card .error-msg.show {
    display: block;
}


/* ===== Toast 消息 ===== */
#toast-container {
    position: fixed;
    top: calc(var(--header-height) + 12px);
    right: 12px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-width: 340px;
    width: 100%;
    pointer-events: none;
}

.toast {
    padding: 12px 18px;
    border-radius: var(--radius-sm);
    color: #fff;
    font-size: 14px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    animation: slideDown 0.3s ease;
    pointer-events: auto;
    display: flex;
    align-items: center;
    gap: 10px;
}

.toast-success {
    background: var(--success);
}

.toast-error {
    background: var(--danger);
}

.toast-warning {
    background: var(--warning);
}

.toast-info {
    background: var(--primary);
}

.toast-icon {
    font-size: 18px;
    flex-shrink: 0;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}


/* ===== Modal 弹窗 ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    z-index: 9998;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    animation: fadeIn 0.2s ease;
}

.modal-box {
    background: var(--card);
    border-radius: var(--radius);
    max-width: 480px;
    width: 100%;
    padding: 28px 24px;
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.2);
    max-height: 90vh;
    overflow-y: auto;
}

.modal-box .modal-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.modal-box .modal-body {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.modal-box .modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.modal-box .modal-actions button {
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    border: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
}

.modal-box .modal-actions .btn-cancel {
    background: var(--bg);
    color: var(--text-secondary);
}

.modal-box .modal-actions .btn-cancel:hover {
    background: var(--border);
}

.modal-box .modal-actions .btn-confirm {
    background: var(--primary);
    color: #fff;
}

.modal-box .modal-actions .btn-confirm:hover {
    background: var(--primary-hover);
}

.modal-box .modal-actions .btn-danger {
    background: var(--danger);
    color: #fff;
}

.modal-box .modal-actions .btn-danger:hover {
    background: var(--danger-hover);
}

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


/* ===== 错误页 ===== */
.error-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
    padding: 20px;
}

.error-card {
    text-align: center;
}

.error-icon {
    font-size: 56px;
    margin-bottom: 12px;
}

.error-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
}

.error-desc {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 20px;
}

.error-btn {
    display: inline-block;
    padding: 10px 28px;
    background: var(--primary);
    color: #fff;
    border-radius: var(--radius-full);
    font-weight: 500;
    transition: background 0.2s;
}

.error-btn:hover {
    background: var(--primary-hover);
}


/* ===== Footer ===== */
.footer {
    text-align: center;
    padding: 20px 12px;
    font-size: 13px;
    color: var(--text-light);
    border-top: 1px solid var(--border);
    margin-top: 20px;
}


/* ===== 加载状态 ===== */
.loading-spinner {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px 0;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 14px;
}

.loading-spinner .spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}


/* ============================================
   响应式
   ============================================ */

/* 平板及以下 */
@media (max-width: 768px) {
    .header-logo {
        font-size: 16px;
    }

    .header-center {
        max-width: 200px;
    }

    .header-center .search-input {
        font-size: 13px;
        padding: 4px 12px;
    }

    .header-right {
        font-size: 13px;
        gap: 4px;
    }

    .btn-login,
    .btn-admin {
        font-size: 12px;
        padding: 3px 10px;
    }

    .user-name {
        font-size: 12px;
    }

    .btn-logout {
        font-size: 12px;
    }

    .article-detail .detail-title {
        font-size: 22px;
    }

    .article-detail .detail-body {
        font-size: 15px;
    }

    #app {
        padding: 0 10px;
    }

    .category-wrapper {
        padding-left: 10px;
        padding-right: 10px;
        margin: 0 -10px;
    }
}

/* 手机 */
@media (max-width: 640px) {
    :root {
        --header-height: 50px;
    }

    .header-logo {
        font-size: 15px;
    }

    .header-center {
        max-width: 140px;
    }

    .header-center .search-input {
        font-size: 12px;
        padding: 4px 10px;
    }

    .header-right {
        font-size: 12px;
        gap: 4px;
    }

    .btn-login,
    .btn-admin {
        font-size: 11px;
        padding: 3px 10px;
    }

    .user-name {
        font-size: 11px;
    }

    .btn-logout {
        font-size: 11px;
    }

    .category-scroll a {
        font-size: 12px;
        padding: 3px 12px;
    }

    .article-card {
        padding: 14px 14px;
    }

    .article-card .card-title {
        font-size: 15px;
    }

    .article-card .card-summary {
        font-size: 13px;
    }

    .article-detail .detail-title {
        font-size: 20px;
    }

    .article-detail .detail-body {
        font-size: 15px;
        line-height: 1.8;
    }

    .login-card {
        padding: 28px 20px;
    }

    #app {
        padding: 0 8px;
    }

    .category-wrapper {
        padding-left: 8px;
        padding-right: 8px;
        margin: 0 -8px;
    }
}

/* 极窄屏 (< 380px)：切换为下拉菜单 */
@media (max-width: 380px) {
    .category-scroll {
        display: none;
    }

    .category-select-mobile {
        display: block;
        width: 100%;
        max-width: 100%;
    }

    .header-center {
        max-width: 100px;
    }

    .btn-login,
    .btn-admin {
        font-size: 10px;
        padding: 2px 8px;
    }

    .user-name {
        font-size: 10px;
    }

    .btn-logout {
        font-size: 10px;
        padding: 2px 4px;
    }
}

/* 桌面端 */
@media (min-width: 1024px) {
    #app {
        padding: 0 24px;
    }

    .article-list-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }

    .article-card {
        margin-bottom: 0;
    }

    .article-card:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 24px var(--shadow-hover);
    }

    .category-wrapper {
        padding-left: 0;
        padding-right: 0;
        margin: 0;
        background: transparent;
    }

    .category-scroll a:hover {
        background: var(--primary-light);
        color: var(--primary);
    }

    .category-scroll a.active:hover {
        background: var(--primary);
        color: #fff;
    }

    .header-center {
        max-width: 400px;
    }

    .login-card {
        padding: 48px 40px;
    }
}