/* ==========================================
   首页框架 - 网页端样式 (index.css)
   顶部导航 + 左侧菜单 + iframe 内容区
   ========================================== */

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

body {
    font-family: 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    background-color: #eef3fa;
    background-image: radial-gradient(circle at 85% 8%, rgba(59, 130, 246, 0.08), transparent 40%),
                      radial-gradient(circle at 10% 90%, rgba(14, 165, 233, 0.06), transparent 40%);
    color: #333;
    min-height: 100vh;
}

/* 表单控件默认不继承 body 字体，需显式统一，否则会与正文字体不一致 */
input,
textarea,
select,
button {
    font-family: inherit;
}

/* ================= 顶部导航栏 ================= */
.top-nav {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #e8edf5;
    box-shadow: 0 2px 12px rgba(30, 99, 240, 0.07);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-inner {
    max-width: 1320px;
    margin: 0 auto;
    height: 68px;
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 48px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-logo {
    height: 40px;
    width: auto;
}

.brand-name {
    font-size: 19px;
    font-weight: 700;
    background: linear-gradient(90deg, #1d4ed8, #3b82f6);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: 1px;
    white-space: nowrap;
}

.nav-links {
    display: flex;
    gap: 32px;
    flex: 1;
}

.nav-link {
    color: #5a6478;
    text-decoration: none;
    font-size: 15px;
    padding: 6px 2px;
    position: relative;
    transition: color 0.2s;
}

.nav-link:hover {
    color: #2563eb;
}

.nav-link::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #2563eb, #38bdf8);
    border-radius: 2px;
    transition: width 0.25s;
}

.nav-link:hover::after {
    width: 100%;
}

/* 顶部下拉菜单（个人中心 / AI 智能服务） */
.nav-drop {
    position: relative;
    display: flex;
    align-items: center;
}

.nav-drop-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
}

.nav-drop-toggle > i:first-child {
    font-size: 14px;
}

.nav-drop-arrow {
    font-size: 10px;
    color: #c3cdde;
    transition: transform 0.25s, color 0.2s;
}

.nav-drop.open .nav-drop-arrow {
    transform: rotate(180deg);
    color: #2563eb;
}

.nav-drop-menu {
    position: absolute;
    top: calc(100% + 12px);
    left: 50%;
    transform: translateX(-50%);
    min-width: 168px;
    background: #fff;
    border: 1px solid #eef2f8;
    border-radius: 12px;
    box-shadow: 0 12px 32px rgba(30, 99, 240, 0.12);
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s, transform 0.2s;
    z-index: 200;
}

.nav-drop.open .nav-drop-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.nav-drop-item {
    display: block;
    padding: 9px 14px;
    border-radius: 8px;
    font-size: 14px;
    color: #5a6478;
    text-decoration: none;
    white-space: nowrap;
    text-align: center;
    transition: background 0.2s, color 0.2s;
}

.nav-drop-item:hover {
    background: #f1f6ff;
    color: #2563eb;
}

.nav-drop-item.active {
    background: linear-gradient(90deg, #2563eb, #3b82f6);
    color: #fff;
    font-weight: 600;
}

.user-box {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
}

.avatar-wrap {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    padding: 2px;
    background: linear-gradient(135deg, #3b82f6, #60a5fa);
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.avatar-wrap img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    display: block;
    background: #e8f1ff;
}

.user-meta {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.user-name {
    font-size: 15px;
    font-weight: 600;
    color: #26314a;
}

.user-desc {
    font-size: 12px;
    color: #93a0b8;
}

.user-arrow {
    font-size: 11px;
    color: #c3cdde;
    transition: transform 0.3s;
    margin-left: 2px;
}

/* ----- 用户下拉菜单 ----- */
.user-dropdown {
    position: relative;
    margin-left: auto;
}

.user-dropdown-menu {
    position: absolute;
    right: 0;
    top: calc(100% + 10px);
    min-width: 180px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(30, 99, 240, 0.15);
    border: 1px solid #eef2f8;
    padding: 6px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: all 0.25s;
    z-index: 200;
}

.user-dropdown.open .user-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-dropdown.open .user-arrow {
    transform: rotate(180deg);
    color: #2563eb;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 8px;
    font-size: 14px;
    color: #26314a;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
    white-space: nowrap;
}

.dropdown-item i {
    width: 16px;
    text-align: center;
    font-size: 13px;
    color: #93a0b8;
    transition: color 0.2s;
}

.dropdown-item:hover {
    background: #f1f6ff;
    color: #2563eb;
}

.dropdown-item:hover i {
    color: #2563eb;
}

.dropdown-logout {
    color: #e34d59;
    border-top: 1px solid #f1f5fb;
    margin-top: 4px;
    padding-top: 12px;
    border-radius: 0 0 8px 8px;
}

.dropdown-logout:hover {
    background: #fff6f7;
    color: #e34d59;
}

.dropdown-logout:hover i {
    color: #e34d59;
}

.dropdown-danger {
    color: #e34d59;
}

.dropdown-danger i {
    color: #e34d59;
}

.dropdown-danger:hover {
    background: #fff1f1;
    color: #e34d59;
}

.dropdown-danger:hover i {
    color: #e34d59;
}

/* ================= 主体布局 ================= */
.main-container {
    max-width: 1320px;
    margin: 24px auto 40px;
    padding: 0 24px;
    display: flex;
    gap: 24px;
    align-items: flex-start;
}

/* ================= 右侧内容区 ================= */
.content {
    flex: 1;
    min-width: 0;
}

.iframe-wrap {
    background: #fff;
    border-radius: 18px;
    border: 1px solid #eef2f8;
    box-shadow: 0 8px 32px rgba(30, 99, 240, 0.08);
    overflow: hidden;
    position: relative;
    height: calc(100vh - 132px);
    min-height: 600px;
}

#mainFrame {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
}

#mainFrame.hidden {
    display: none;
}

/* 页面建设中占位 */
.placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    background: #fff;
    color: #94a3b8;
    text-align: center;
    padding: 24px;
}

.placeholder.hidden {
    display: none;
}

.placeholder i {
    font-size: 52px;
    color: #dbe4f5;
    margin-bottom: 6px;
}

.placeholder h3 {
    font-size: 18px;
    font-weight: 600;
    color: #64748b;
}

.placeholder p {
    font-size: 14px;
    color: #a4b0c6;
}

/* ================= 响应式 ================= */
@media (max-width: 900px) {
    .nav-inner {
        justify-content: space-between;
        gap: 20px;
    }

    .nav-links {
        gap: 22px;
        overflow-x: auto;
        padding-bottom: 4px;
    }

    .nav-drop-menu {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        transform: none;
        max-width: 90vw;
        margin: 0 auto;
    }

    .nav-drop.open .nav-drop-menu {
        transform: none;
    }

    .iframe-wrap {
        height: 70vh;
        min-height: 400px;
    }
}

@media (max-width: 600px) {
    .user-meta {
        display: none;
    }
}

/* ================= 移动端深度适配 (768px 以下) ================= */
@media (max-width: 768px) {
    .nav-inner {
        padding: 0 14px;
        height: 56px;
        gap: 10px;
    }
    .nav-links {
        display: none;
    }
    .brand-logo {
        height: 32px;
    }
    .brand-name {
        font-size: 15px;
        letter-spacing: 0.5px;
    }
    .main-container {
        padding: 12px;
        margin: 0 auto 24px;
    }
    .user-dropdown-menu {
        position: fixed;
        right: 12px;
        top: 58px;
        min-width: 160px;
    }
}

/* 超小屏 */
@media (max-width: 480px) {
    .brand-name {
        font-size: 14px;
    }
    .brand-logo {
        height: 28px;
    }
}