.portal-page {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    background: radial-gradient(circle at top, #0f172a 0, #020617 45%, #000000 100%);
    min-height: 100vh;
    margin: 0;
    color: var(--um-text-primary);
}

@media (max-width: 640px) {
    /* 移动端：隐藏顶部模式切换标签，交互改由底部导航承担 */
    .portal-tabs {
        display: none !important;
    }
}

.portal-main {
    height: 100vh;
    padding: 0 12px;
    display: flex;
    align-items: stretch;
    justify-content: stretch;
    overflow: hidden;
}

@media (max-width: 640px) {
    /* 手机端登录页：顶部留白更多，允许整体滚动，避免软键盘遮挡表单 */
    .portal-login-root {
        align-items: flex-start;
        justify-content: flex-start;
        padding: 24px 12px 32px;
        overflow-y: auto;
    }

    .portal-login-root .portal-container {
        max-width: 100%;
    }

    .portal-login-root .portal-card {
        max-width: 420px;
        margin: 24px auto 16px;
        border-radius: 16px;
    }
}

.portal-container {
    width: 100%;
    max-width: 420px;
}

/* 登录页专用：整体居中布局 */
.portal-login-root {
    width: 100%;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px 12px;
    box-sizing: border-box;
    position: relative;
    z-index: 1;
}

.portal-login-root .portal-container {
    width: 100%;
    max-width: 420px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
}

.portal-login-root .portal-card {
    border-radius: 18px;
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(14px);
    transform-origin: center bottom;
    /* 初始淡入 + 持续的柔和阳光发光 */
    animation:
        portal-login-card-fadeIn 0.6s ease-out,
        portal-login-hover-glow 1.8s ease-in-out infinite alternate;
    width: 100%;
    max-width: 420px;
    overflow: hidden;
}

@keyframes portal-login-card-fadeIn {
    0% {
        opacity: 0;
        transform: translateY(14px) scale(0.98);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.portal-card,
.portal-home-card {
    background: radial-gradient(circle at top left, #111827 0, #020617 80%);
    border-radius: 10px;
    box-shadow: 0 14px 40px rgba(0, 0, 0, 0.6);
    padding: 20px 20px 22px;
    border: 1px solid rgba(148, 163, 184, 0.18);
    box-sizing: border-box;
}

.portal-title {
    margin: 0 0 8px;
    font-size: 22px;
    font-weight: 600;
    color: #f9fafb;
    text-align: center;
}

.portal-subtitle {
    margin: 0 0 24px;
    font-size: 13px;
    color: #9ca3af;
    text-align: center;
}

.portal-error {
    margin-bottom: 16px;
    padding: 10px 12px;
    border-radius: 8px;
    background: rgba(248, 113, 113, 0.14);
    background: color-mix(in srgb, var(--um-danger) 18%, transparent);
    color: var(--um-text-primary);
    font-size: 13px;
}

.portal-success {
    margin-top: 12px;
    padding: 10px 12px;
    border-radius: 10px;
    background: rgba(34, 197, 94, 0.12);
    background: color-mix(in srgb, var(--um-success) 18%, transparent);
    color: var(--um-text-primary);
}

.portal-modal {
    position: fixed;
    inset: 0;
    z-index: 9999;
}

.portal-modal,
.portal-modal * {
    box-sizing: border-box;
}

.portal-modal__backdrop {
    position: absolute;
    inset: 0;
    background: rgba(2, 6, 23, 0.65);
    background: var(--cm-modal-overlay-bg, rgba(2, 6, 23, 0.65));
}

.portal-modal__dialog {
    position: relative;
    width: min(720px, calc(100% - 24px));
    max-height: calc(100vh - 32px);
    margin: 16px auto;
    background: var(--um-bg-panel);
    border-radius: 14px;
    overflow: hidden;
    overflow-x: hidden;
    box-shadow: var(--um-shadow);
    border: 1px solid var(--um-border);
    display: flex;
    flex-direction: column;
}

.portal-modal__header {
    padding: 12px 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--um-border);
}

.portal-modal__title {
    font-size: 14px;
    font-weight: 700;
    color: var(--um-text-primary);
}

.portal-modal__close {
    appearance: none;
    border: 0;
    background: transparent;
    font-size: 20px;
    line-height: 1;
    cursor: pointer;
    color: var(--um-text-secondary);
}

.portal-modal__close:hover {
    color: var(--um-text-primary);
}

.portal-modal__body {
    padding: 14px;
    overflow: auto;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.portal-modal .portal-field label {
    color: var(--um-text-primary);
}

.portal-modal .portal-field input[type="text"],
.portal-modal .portal-field input[type="password"],
.portal-modal .portal-field input[type="number"],
.portal-modal .portal-field input[type="datetime-local"],
.portal-modal .portal-field select,
.portal-modal .portal-field textarea {
    background: var(--um-bg-secondary);
    background-color: var(--um-bg-secondary);
    background-image: none;
    border-color: var(--um-border);
    color: var(--um-text-primary);
    width: 100%;
}

.portal-modal .portal-field input::placeholder,
.portal-modal .portal-field textarea::placeholder {
    color: var(--um-text-secondary);
    opacity: 0.9;
}

.portal-modal .portal-field input:focus,
.portal-modal .portal-field select:focus,
.portal-modal .portal-field textarea:focus {
    border-color: var(--um-accent);
    box-shadow:
        0 0 0 1px color-mix(in srgb, var(--um-accent) 45%, transparent),
        0 0 18px color-mix(in srgb, var(--um-accent) 30%, transparent);
}

.portal-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 16px;
}

.portal-modal .portal-actions {
    grid-template-columns: 1fr;
    margin-top: 4px;
}

.portal-actions .portal-button {
    min-width: 0;
}

@media (max-width: 640px) {
    .portal-actions {
        grid-template-columns: 1fr;
    }
}

.portal-form {
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding: 0 8px 8px;
}

.portal-field,
.portal-remember {
    padding: 0 2px;
}

.portal-field label {
    display: block;
    margin-bottom: 4px;
    font-size: 13px;
    color: #e5e7eb;
}

.portal-field input[type="text"],
.portal-field input[type="password"] {
    width: 95%;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid #1f2937;
    font-size: 14px;
    outline: none;
    transition: border-color 0.18s, box-shadow 0.18s, background-color 0.18s;
    background-color: rgba(15, 23, 42, 0.96);
    color: #e5e7eb;
}

.portal-field input[type="text"]:focus,
.portal-field input[type="password"]:focus {
    border-color: #38bdf8;
    box-shadow:
        0 0 0 1px rgba(56, 189, 248, 0.45),
        0 0 18px rgba(56, 189, 248, 0.3);
    background-color: rgba(15, 23, 42, 0.98);
}

.portal-remember {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 13px;
    color: #9ca3af;
}

/* 学科详情视图：面包屑与返回按钮 */
/* 学科详情与学习模式相关的样式已拆分至 portal/learning.css，这里仅保留通用门户样式 */

.portal-button {
    width: 100%;
    margin-top: 4px;
    padding: 9px 12px;
    border: none;
    border-radius: 6px;
    background: linear-gradient(135deg, #38bdf8, #0ea5e9);
    color: #0b1120;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.08s ease, box-shadow 0.08s ease, background 0.15s;
}

.portal-button:hover {
    box-shadow: 0 8px 20px rgba(56, 189, 248, 0.35);
    transform: translateY(-1px);
}

.portal-button:active {
    box-shadow: 0 3px 8px rgba(37, 99, 235, 0.25);
    transform: translateY(0);
}

/* 登录页专用：更炫的发光按钮效果，仅作用于登录卡片内部 */
.portal-login-root .portal-button {
    margin-left: 4px;
    margin-right: 4px;
    padding: 11px 14px;
    border-radius: 9999px;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 0.02em;
    box-shadow: 0 10px 30px rgba(56, 189, 248, 0.45);
    animation: portal-login-button-glow 2s ease-in-out infinite alternate;
}

.portal-login-root .portal-button:hover {
    box-shadow: 0 16px 40px rgba(56, 189, 248, 0.6);
    transform: translateY(-1.5px) scale(1.01);
    filter: brightness(1.08);
}

.portal-login-root .portal-button:active {
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.4);
    transform: translateY(0) scale(0.99);
}

@keyframes portal-login-button-glow {
    0% {
        box-shadow: 0 10px 26px rgba(56, 189, 248, 0.38);
    }
    100% {
        box-shadow:
            0 14px 38px rgba(56, 189, 248, 0.65),
            0 0 18px rgba(56, 189, 248, 0.55);
    }
}

/* 欢迎页布局复用通用卡片样式 */
.portal-home-wrapper {
    width: 100%;
    max-width: 720px;
}

.portal-home-header {
    position: relative;
    padding-right: 26px; /* 为右上角折叠按钮预留空间 */
}

.portal-home-header h1 {
    margin: 0 0 4px;
    font-size: 20px;
    color: #f9fafb;
}

.portal-home-header p {
    margin: 0;
    font-size: 14px;
    color: #9ca3af;
}

/* 顶部卡片头部的展开/收起按钮 */
.portal-home-header__toggle {
    position: absolute;
    top: 0;
    right: 0;
    border: none;
    padding: 2px 6px;
    border-radius: 9999px;
    font-size: 11px;
    color: #9ca3af;
    background: transparent;
    cursor: pointer;
    transition: background 0.12s ease, color 0.12s ease, transform 0.08s ease;
}

.portal-home-header__toggle:hover {
    background: rgba(148, 163, 184, 0.16);
    color: #e5e7eb;
    transform: translateY(-0.5px);
}

/* 折叠状态：隐藏描述文本和进度条，仅保留标题一行 */
.portal-home-header.is-collapsed p,
.portal-home-header.is-collapsed .portal-summary-progress {
    display: none;
}

.portal-home-body {
    margin-top: 16px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.portal-home-section h2 {
    margin: 0 0 10px;
    font-size: 16px;
    color: #e5e7eb;
}

.portal-home-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.portal-home-section li {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    font-size: 14px;
    border-bottom: 1px dashed #e5e7eb;
}

.portal-home-section li span:first-child {
    color: #9ca3af;
}

.portal-home-section li span:last-child {
    color: #e5e7eb;
}

.portal-home-hint {
    grid-column: 1 / -1;
    font-size: 13px;
    color: #9ca3af;
    background: rgba(15, 23, 42, 0.8);
    border-radius: 8px;
    padding: 10px 12px;
}

/* 学习平台主页布局 */
.portal-layout {
    width: 100%;
    max-width: 100%;
    display: flex;
    flex-direction: column;
    height: 100%;
    margin: 0;
    padding: 12px 0;
    box-sizing: border-box;
}

.portal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 0 0 16px;
    /* 头部高度与右侧标签按钮接近，整体更紧凑 */
    padding: 6px 16px;
    border-radius: 16px;
    background: radial-gradient(circle at top left, rgba(15,23,42,0.96) 0, rgba(15,23,42,0.9) 80%);
    border: 1px solid rgba(148, 163, 184, 0.35);
    box-shadow: 0 14px 40px rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(14px);
}

.portal-logout-link {
    margin-left: 12px;
    text-decoration: none;
}

.portal-header-left {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 8px;
}

.portal-header-theme {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: 12px;
    font-size: 12px;
    color: #9ca3af;
}

.portal-header-theme-select {
    padding: 4px 10px;
    border-radius: 9999px;
    border: 1px solid rgba(148, 163, 184, 0.7);
    background: rgba(15, 23, 42, 0.9);
    color: #e5e7eb;
    font-size: 12px;
}

.portal-header-title {
    font-size: 18px;
    font-weight: 600;
    color: #f9fafb;
}

@media (max-width: 640px) {
    /* 移动端：隐藏标题，仅保留欢迎 + 主题 + 退出一行，尽量压缩高度 */
    .portal-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 6px 10px;
        row-gap: 0;
        position: sticky;
        top: 0;
        z-index: 30; /* 保证在下面内容和卡片之上 */
    }

    .portal-header-left {
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 6px;
    }

    .portal-header-title {
        display: none;
    }

    .portal-header-subtitle {
        font-size: 11px;
    }

    .portal-header-theme {
        margin-left: 8px;
    }

    .portal-logout-link {
        margin-left: 8px;
    }
}

/* 学习卡片缩略图：位于标题左侧的小圆形封面 */
/* 学习卡片缩略图：矩形封面，比例稍大一些 */
.portal-learning-card__thumb {
    flex: 0 0 112px;
    width: 112px;
    height: 100%;
    border-radius: 14px 0 0 14px;
    overflow: hidden;
    border: 1px solid rgba(148, 163, 184, 0.7);
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.9);
    background: rgba(15, 23, 42, 0.95);
}

.portal-learning-card__thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* 子学科卡片中的缩略图稍微小一点，层级感更强 */
.portal-learning-card--child .portal-learning-card__thumb {
    flex-basis: 80px;
    width: 80px;
    height: 52px;
    box-shadow: 0 6px 16px rgba(15, 23, 42, 0.9);
}

.portal-header-subtitle {
    margin: 0;
    font-size: 12px;
    color: #9ca3af;
}

.portal-tabs {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 2px 6px;
    border-radius: 9999px;
    background: rgba(15, 23, 42, 0.85);
    border: 1px solid rgba(148, 163, 184, 0.45);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.6);
}

.portal-tabs-primary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.portal-tabs-more {
    position: relative;
    display: inline-flex;
    align-items: center;
}

.portal-tab {
    border: none;
    background: transparent;
    font-size: clamp(12px, 0.9vw, 15px);
    padding: 6px clamp(14px, 1.3vw, 22px);
    border-radius: 9999px;
    color: #e5e7eb;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, box-shadow 0.12s, transform 0.1s;
}

.portal-tab:hover {
    background: rgba(148, 163, 184, 0.16);
    transform: translateY(-0.5px);
}

.portal-tab.is-active {
    background: linear-gradient(135deg, #38bdf8, #0ea5e9);
    color: #020617;
    box-shadow: 0 3px 10px rgba(56, 189, 248, 0.45);
}

.portal-tab-more {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-weight: 500;
}

.portal-more-menu {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    min-width: 140px;
    padding: 6px 4px;
    border-radius: 10px;
    background: radial-gradient(circle at top, rgba(15,23,42,0.98) 0, rgba(15,23,42,0.96) 50%, rgba(15,23,42,0.94) 100%);
    border: 1px solid rgba(148, 163, 184, 0.55);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(14px);
    display: none;
    z-index: 10;
}

.portal-tabs-more.is-open .portal-more-menu {
    display: block;
}

.portal-more-item {
    width: 100%;
    padding: 6px 10px;
    border: none;
    background: transparent;
    color: #e5e7eb;
    font-size: 13px;
    text-align: left;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}

.portal-more-item:hover {
    background: rgba(148, 163, 184, 0.22);
}

.portal-body {
    display: grid;
    grid-template-columns: minmax(260px, 340px) minmax(0, 1fr);
    gap: 14px;
    margin-top: 0;
    flex: 1;
    min-height: 0; /* 关键：允许内部区域滚动 */
}

.portal-sidebar {
    background: radial-gradient(circle at top, rgba(15,23,42,0.96) 0, rgba(15,23,42,0.9) 45%, rgba(15,23,42,0.88) 100%);
    border-radius: 16px;
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.78);
    padding: 14px 12px;
    border: 1px solid rgba(209, 213, 219, 0.25);
    backdrop-filter: blur(10px);
    box-sizing: border-box;
    overflow: hidden;
    min-height: 0;
}

.portal-sidebar-title {
    margin: 0 0 6px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.18em;
    color: #facc15;
    text-indent: 0.18em;
}

.portal-content {
    /* 学习视图内部已有独立的滚动容器（如 .portal-kp-detail-scroll、.portal-kp-list），
       这里关闭外层滚动，避免右侧出现双层滚动条。
       作为右侧列容器时拉满当前行高度，便于与左侧侧边栏底部对齐。 */
    overflow: hidden;
    min-height: 0;
    box-sizing: border-box;
    height: 100%;
    display: flex;
    flex-direction: column;
}

/* 题库模式：允许右侧内容根据实际高度向下扩展，由整个页面产生滚动条，
   避免内部列表被固定高度裁剪导致内容看不全。仅在题库模式下生效，
   不影响学习等其它模式原有的内部滚动策略。 */
.portal-content.portal-content--bank {
    overflow: visible;
    height: auto;
    min-height: 100%;
}

/* 右侧主卡片：在学习/题库等模式下统一拉满当前列高度，内部再自行控制滚动区域，
   避免只在题库模式下设置 height:100% 导致两个模式的容器高度看起来不一致。 */
.portal-content > .portal-home-card {
    height: 100%;
    display: flex;
    flex-direction: column;
}

/* 题库主卡片在题库模式下允许高度随内容增长，同时保持最小高度铺满当前视口，
   避免因为统一的 height:100% 限制导致题库列表和分页被裁剪。 */
.portal-content.portal-content--bank > .portal-home-card--bank {
    height: auto;
    min-height: 100%;
}

/* 学习模式相关卡片和知识点样式已拆分到 portal.learning.css */

/* 学习平台树结构：复用班级管理 cm-tree 的样式 */
.cm-tree-wrapper--portal {
    position: relative;
    padding: 14px 10px 10px;
    border-radius: 14px;
    background: var(--um-bg-panel);
    /* 使用主题通用边框颜色，整体更干净 */
    border: 1px solid var(--um-border);
    /* 轻微内阴影，营造嵌入式立体感 */
    box-shadow: inset 0 2px 6px rgba(15, 23, 42, 0.65);
    /* 树结构在自身容器内滚动，避免整块侧边栏滚动 */
    max-height: calc(100vh - 180px);
    overflow: auto;
    scrollbar-width: thin; /* Firefox */
    scrollbar-color: var(--um-accent) var(--um-bg-secondary);
}

.cm-tree-wrapper--portal::-webkit-scrollbar {
    width: 8px;
}

.cm-tree-wrapper--portal::-webkit-scrollbar-track {
    background: var(--um-bg-secondary);
    border-radius: 9999px;
}

.cm-tree-wrapper--portal::-webkit-scrollbar-thumb {
    border-radius: 9999px;
    background: linear-gradient(180deg, var(--um-accent), var(--um-accent-hover));
    box-shadow: 0 0 0 1px var(--um-bg-primary);
}

.cm-tree-wrapper--portal::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--um-accent-hover), var(--um-accent));
}

/* 中式四角花纹：保留注释，但在门户树中取消额外装饰，保持干净边框 */
.cm-tree-wrapper--portal::before,
.cm-tree-wrapper--portal::after {
    content: none;
}

.cm-tree {
    list-style: none;
    margin: 0;
    padding: 0;
}

.cm-empty {
    padding: 28px 10px;
    text-align: center;
    color: var(--um-text-secondary);
    font-size: 13px;
    border-radius: 10px;
    border: 1px dashed var(--um-border);
}

.cm-tree li {
    position: relative;
    margin: 2px 0;
}

.cm-node {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px; /* 与班级管理树保持一致的高度和左右留白 */
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease;
    min-width: 0;
}

.cm-node:hover {
    background: var(--um-bg-hover);
}

.cm-node.cm-node--focused {
    background: var(--um-bg-hover);
    border: 1px solid var(--um-accent);
}

.cm-node__toggle {
    width: 18px;
    height: 18px;
    border-radius: 4px;
    border: 1px solid var(--um-border);
    background: var(--um-bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    cursor: pointer;
    color: var(--um-text-secondary);
}

.cm-node__toggle:hover {
    color: var(--um-text-primary);
    border-color: var(--um-accent);
}

.cm-node__toggle.is-leaf {
    visibility: hidden;
}

.cm-node__title {
    flex: 1 1 auto;
    font-size: 14px; /* 与班级管理树保持一致 */
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--um-text-primary);
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.cm-node__meta {
    font-size: 12px; /* 与班级管理树保持一致 */
    color: var(--um-text-secondary);
    padding: 4px 8px;
    background: var(--um-bg-secondary);
    border-radius: 9999px;
    flex: 0 0 auto;
    min-width: 20px;
    text-align: center;
}

.cm-children {
    margin-left: 22px;
    padding-left: 10px;
    border-left: 1px dashed var(--um-border);
}

.cm-children.is-collapsed {
    display: none;
}

/* 自定义侧边栏滚动条（仅桌面浏览器生效） */
.portal-sidebar::-webkit-scrollbar {
    width: 6px;
}

.portal-sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.portal-sidebar::-webkit-scrollbar-thumb {
    background: rgba(148, 163, 184, 0.45);
    border-radius: 9999px;
}

.portal-sidebar::-webkit-scrollbar-thumb:hover {
    background: rgba(148, 163, 184, 0.7);
}

/* 响应式布局：中小屏幕下侧边栏与内容区域上下堆叠 */
@media (max-width: 960px) {
    .portal-main {
        height: auto;
        min-height: 100vh;
        padding: 16px 10px 24px;
        overflow: visible;
    }

    .portal-layout {
        max-width: 100%;
        height: auto;
    }

    .portal-body {
        grid-template-columns: 1fr;
        gap: 12px;
        flex: none;
    }

    .portal-sidebar,
    .portal-content {
        height: auto;
        min-height: 0;
        overflow: visible;
    }

    .portal-container {
        max-width: 100%;
        padding-top: 40px;
        padding-bottom: 32px;
    }
}

/* 更窄屏幕下的专项适配：
   - 压缩顶部 header 和模式切换区域的高度
   - 减小卡片间距，让「模式切换 + 结构导航 + 当前模式说明」尽量出现在一屏内 */
@media (max-width: 640px) {
    .portal-layout {
        padding: 4px 0;
    }

    .portal-header {
        padding: 6px 10px;
        margin-bottom: 10px;
    }

    .portal-header-title {
        font-size: 16px;
    }

    .portal-header-subtitle {
        font-size: 11px;
    }

    /* 模式切换标签在手机端更紧凑，可适当换行 */
    .portal-tabs {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
        padding: 2px 4px;
        gap: 4px;
    }

    .portal-tabs-primary {
        flex-wrap: wrap;
        justify-content: center;
        row-gap: 4px;
    }

    .portal-tab {
        padding: 5px 10px;
        font-size: 12px;
    }

    .portal-body {
        gap: 10px;
    }

    .portal-sidebar {
        padding: 10px 10px;
    }

    .portal-card,
    .portal-home-card {
        padding: 14px 14px 16px;
    }

    .portal-home-header h1 {
        font-size: 18px;
    }

    .portal-home-header p {
        font-size: 13px;
    }
}

@media (min-width: 1440px) {
    .portal-layout {
        max-width: 100%;
    }
}