/* =====================================================
   iModel AI — layout.css
   双层 Header（Top Bar + Navbar）浮层模式 + Footer
   ===================================================== */

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

:root {
    --color-navy:        #0d1b2e;
    --color-navy-mid:    #112240;
    --color-gold:        #c9a84c;
    --color-gold-light:  #e2c06d;
    --color-white:       #ffffff;
    --color-text-muted:  rgba(255,255,255,0.6);
    --color-border:      rgba(201,168,76,0.2);
    --color-border-dim:  rgba(255,255,255,0.15);

    --font-display: 'Noto Serif SC', Georgia, serif;
    --font-body:    'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;

    --topbar-height:  38px;
    --navbar-height:  66px;
    --container-max:  1200px;

    --transition-fast: 0.18s ease;
    --transition-base: 0.28s ease;
    --shadow-card:     0 8px 32px rgba(0,0,0,0.35);
}

/* =====================================================
   SITE HEADER — 完全浮层，不占布局空间
   ===================================================== */
.imodel-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 9999;
    /* 透明背景，浮在内容上 */
    background: transparent;
}

/* ── 页面内容从顶部 0 开始，Header 浮在上方 ──────── */
/* 不给 body / main 加 padding-top，让内容从 top:0 开始 */
body {
    margin: 0;
    padding: 0;
}

/* =====================================================
   TOP BAR（信息条）— 半透明深色
   ===================================================== */
.imodel-topbar {
    height: var(--topbar-height);
    /* 深色半透明，不完全遮挡背景 */
    background: rgba(10, 20, 36, 0.55);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    transition: transform var(--transition-base),
                opacity var(--transition-base);
    will-change: transform;
}

/* 滚动后隐藏 top bar（向上滑走） */
.imodel-header.scrolled .imodel-topbar {
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
}

.imodel-topbar__inner {
    max-width: var(--container-max);
    height: 100%;
    margin: 0 auto;
    padding: 0 32px;
    display: flex;
    align-items: center;
}

.imodel-topbar__contacts {
    display: flex;
    align-items: center;
    gap: 28px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.imodel-topbar__item {
    display: flex;
    align-items: center;
    gap: 7px;
    font-family: var(--font-body);
    font-size: 0.78rem;
    color: rgba(255,255,255,0.75);
    line-height: 1;
}

.imodel-topbar__icon {
    width: 14px;
    height: 14px;
    stroke: var(--color-gold);
    flex-shrink: 0;
}

.imodel-topbar__item strong {
    color: rgba(255,255,255,0.9);
    font-weight: 600;
}

.imodel-topbar__item a {
    color: rgba(255,255,255,0.75) !important;
    text-decoration: none;
    transition: color var(--transition-fast);
}
.imodel-topbar__item a:hover,
.imodel-topbar__item a:focus {
    color: var(--color-gold-light) !important;
    text-decoration: none;
}

/* =====================================================
   NAVBAR（主导航）— 完全透明，滚动后加深
   ===================================================== */
.imodel-navbar {
    height: var(--navbar-height);
    background: transparent;
    /* Header 与 Hero 之间的分隔线，半透明白色 */
    border-bottom: 1px solid rgba(255, 255, 255, 0.18);
    transition: background var(--transition-base),
                box-shadow var(--transition-base),
                border-color var(--transition-base);
}

/* 滚动后分隔线改为金色边框色 */
.imodel-header.scrolled .imodel-navbar {
    border-bottom-color: var(--color-border);
}

/* 滚动后 navbar 本身变深色 */
.imodel-header.scrolled .imodel-navbar {
    background: rgba(10, 20, 36, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 2px 20px rgba(0,0,0,0.4);
}

.imodel-navbar__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--container-max);
    height: 100%;
    margin: 0 auto;
    padding: 0 32px;
}

/* ── Logo ─────────────────────────────────────────── */
.imodel-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    flex-shrink: 0;
}

.imodel-logo__img { height: 38px; width: auto; }

.imodel-logo__text {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: 0.02em;
    font-style: normal;
    /* 文字阴影增强透明背景可读性 */
    text-shadow: 0 1px 6px rgba(0,0,0,0.5);
}

.imodel-logo__text em {
    font-style: normal;
    color: var(--color-gold);
}

/* ── Primary Navigation ───────────────────────────── */
.imodel-nav { display: flex; align-items: center; }

.imodel-nav .menu {
    display: flex;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
}

.imodel-nav .menu-item { position: relative; }

.imodel-nav .menu-item > a {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0 16px;
    height: var(--navbar-height);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 500;
    color: rgba(255,255,255,0.9);
    text-decoration: none;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    transition: color var(--transition-fast);
    white-space: nowrap;
    position: relative;
    /* 文字阴影增强透明背景可读性 */
    text-shadow: 0 1px 4px rgba(0,0,0,0.6);
}

/* 金色下划线指示器 */
.imodel-nav .menu-item > a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 16px;
    right: 16px;
    height: 2px;
    background: var(--color-gold);
    transform: scaleX(0);
    transform-origin: center;
    transition: transform var(--transition-fast);
}

.imodel-nav .menu-item > a:hover,
.imodel-nav .menu-item.current-menu-item > a,
.imodel-nav .menu-item.current-menu-ancestor > a {
    color: var(--color-gold-light);
}

.imodel-nav .menu-item > a:hover::after,
.imodel-nav .menu-item.current-menu-item > a::after {
    transform: scaleX(1);
}

/* 下拉箭头 */
.imodel-nav .menu-item-has-children > a::before {
    content: '▾';
    font-size: 0.65rem;
    opacity: 0.7;
    order: 1;
}

/* ── 下拉子菜单 ───────────────────────────────────── */
.imodel-nav .sub-menu {
    position: absolute;
    top: calc(var(--navbar-height) - 2px);
    left: 0;
    min-width: 200px;
    background: rgba(10, 22, 40, 0.96);
    backdrop-filter: blur(12px);
    border: 1px solid var(--color-border);
    border-top: 2px solid var(--color-gold);
    border-radius: 0 0 6px 6px;
    list-style: none;
    margin: 0;
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity var(--transition-fast),
                visibility var(--transition-fast),
                transform var(--transition-fast);
    box-shadow: var(--shadow-card);
}

.imodel-nav .menu-item:hover > .sub-menu,
.imodel-nav .menu-item:focus-within > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.imodel-nav .sub-menu .menu-item > a {
    height: auto;
    line-height: 1.4;
    padding: 3px 20px;
    font-size: 0.83rem;
    text-transform: none;
    letter-spacing: 0.02em;
    color: rgba(255,255,255,0.75);
    text-shadow: none;
}

.imodel-nav .sub-menu .menu-item > a::after { display: none; }
.imodel-nav .sub-menu .menu-item > a::before { display: none !important; }

.imodel-nav .sub-menu .menu-item > a:hover {
    color: var(--color-gold-light);
    background: rgba(201,168,76,0.08);
}

/*
 * ── 下拉菜单「分组标题」样式 ────────────────────────
 * WordPress 菜单中，父级项如果 URL 填 # 或留空，
 * 视觉上需要与普通链接区分：加粗、金色、加上分隔线。
 *
 * 做法：在后台「外观 → 菜单」里，把分组标题的
 * 「导航标签」前加一个特殊 CSS 类 menu-item-group-title
 * （在菜单项展开后的「CSS 类（可选）」字段填入）。
 * 或者：把链接 URL 设为 # ，用下方的 [href="#"] 选择器自动匹配。
 */

/* 方案 A：加了 CSS 类 menu-item-group-title 的菜单项 */
.imodel-nav .sub-menu .menu-item-group-title > a,
/* 方案 B：URL 为 # 的菜单项（无链接分组标题） */
.imodel-nav .sub-menu .menu-item > a[href$="#"] {
    color: var(--color-gold) !important;
    font-weight: 700 !important;
    font-size: 0.72rem !important;
    letter-spacing: 0.1em !important;
    text-transform: uppercase !important;
    cursor: default;
    pointer-events: none;
    /* 上方加分隔线（第一个除外） */
    margin-top: 6px;
    padding-top: 12px !important;
    border-top: 1px solid var(--color-border);
    background: transparent !important;
}

/* 第一个分组标题不需要上边距和上边框 */
.imodel-nav .sub-menu .menu-item:first-child.menu-item-group-title > a,
.imodel-nav .sub-menu .menu-item:first-child > a[href$="#"] {
    margin-top: 0;
    padding-top: 10px !important;
    border-top: none;
}

/* 分组标题 hover 时不改变样式 */
.imodel-nav .sub-menu .menu-item-group-title > a:hover,
.imodel-nav .sub-menu .menu-item > a[href$="#"]:hover {
    background: transparent !important;
    color: var(--color-gold) !important;
}

/* ── CTA 按钮（菜单项加 class: menu-item-cta） ────── */
.imodel-nav .menu-item-cta > a {
    color: var(--color-navy) !important;
    background: var(--color-gold) !important;
    border-radius: 4px;
    padding: 0 20px !important;
    height: 38px !important;
    line-height: 38px;
    margin-left: 8px;
    font-weight: 700 !important;
    font-size: 0.8rem !important;
    text-shadow: none !important;
    transition: background var(--transition-fast), transform var(--transition-fast) !important;
}

.imodel-nav .menu-item-cta > a:hover {
    background: var(--color-gold-light) !important;
    color: var(--color-navy) !important;
    transform: translateY(-1px);
}

.imodel-nav .menu-item-cta > a::after,
.imodel-nav .menu-item-cta > a::before { display: none !important; }

/* ── 汉堡按钮 ─────────────────────────────────────── */
.imodel-hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: rgba(0,0,0,0.25);
    border: 1px solid var(--color-border-dim);
    border-radius: 4px;
    cursor: pointer;
    padding: 0;
    z-index: 10001;
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

.imodel-hamburger:hover {
    border-color: var(--color-gold);
    background: rgba(0,0,0,0.4);
}

.imodel-hamburger__bar {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-white);
    border-radius: 2px;
    transition: transform var(--transition-base), opacity var(--transition-base);
    transform-origin: center;
}

.imodel-hamburger.is-open .imodel-hamburger__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.imodel-hamburger.is-open .imodel-hamburger__bar:nth-child(2) { opacity: 0; transform: scaleX(0); }
.imodel-hamburger.is-open .imodel-hamburger__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =====================================================
   RESPONSIVE
   ===================================================== */
@media (max-width: 900px) {

    .imodel-topbar__contacts { gap: 16px; }
    .imodel-topbar__item:not(:first-child) { display: none; }

    .imodel-hamburger { display: flex; }

    .imodel-nav {
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        width: min(300px, 82vw);
        background: rgba(10, 22, 40, 0.97);
        backdrop-filter: blur(16px);
        border-left: 1px solid var(--color-border);
        flex-direction: column;
        align-items: flex-start;
        justify-content: flex-start;
        padding: calc(var(--topbar-height) + var(--navbar-height) + 16px) 0 40px;
        transform: translateX(100%);
        transition: transform var(--transition-base);
        z-index: 10000;
        overflow-y: auto;
    }

    .imodel-nav.is-open { transform: translateX(0); }

    .imodel-nav .menu {
        flex-direction: column;
        width: 100%;
    }

    .imodel-nav .menu-item > a {
        height: auto !important;
        line-height: 1.4 !important;
        padding: 13px 24px !important;
        font-size: 0.95rem !important;
        text-transform: none;
        text-shadow: none;
        border-bottom: 1px solid rgba(255,255,255,0.06);
        width: 100%;
    }

    .imodel-nav .menu-item > a::after { display: none !important; }
    .imodel-nav .menu-item > a::before { display: none !important; }

    .imodel-nav .sub-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        border-radius: 0;
        background: rgba(0,0,0,0.25);
        backdrop-filter: none;
        padding: 0;
    }

    .imodel-nav .sub-menu .menu-item > a { padding-left: 40px !important; }

    /* 移动端分组标题 */
    .imodel-nav .sub-menu .menu-item-group-title > a,
    .imodel-nav .sub-menu .menu-item > a[href$="#"] {
        padding-left: 40px !important;
        color: var(--color-gold) !important;
        font-size: 0.72rem !important;
        letter-spacing: 0.1em !important;
        text-transform: uppercase !important;
        pointer-events: none;
        cursor: default;
        border-top: 1px solid var(--color-border);
        background: transparent !important;
    }

    .imodel-nav .sub-menu .menu-item:first-child > a[href$="#"],
    .imodel-nav .sub-menu .menu-item:first-child.menu-item-group-title > a {
        border-top: none;
    }

    .imodel-nav .menu-item-cta > a {
        margin: 16px 24px 0 !important;
        width: calc(100% - 48px) !important;
        text-align: center;
        height: 44px !important;
        line-height: 44px !important;
        display: block;
    }

    .imodel-nav-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.55);
        z-index: 9999;
        backdrop-filter: blur(2px);
    }

    .imodel-nav-overlay.is-visible { display: block; }
}

@media (max-width: 480px) {
    .imodel-topbar { display: none; }
    .imodel-navbar__inner { padding: 0 16px; }
}

/* =====================================================
   SITE FOOTER
   ===================================================== */
.imodel-footer {
    background: var(--color-navy);
    border-top: 1px solid var(--color-border);
    font-family: var(--font-body);
    color: var(--color-text-muted);
}

/* ── Footer 主体网格 ──────────────────────────────── */
.imodel-footer__body {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 64px 32px 48px;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    align-items: start;
}

/* ── 品牌列 ───────────────────────────────────────── */
.imodel-footer__brand {}

.imodel-footer__logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    margin-bottom: 14px;
}

/* Logo 图片高度由 inline style 控制（Customizer 设置） */
.imodel-footer__logo-img {
    width: auto;
    display: block;
}

.imodel-footer__logo-text {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-white);
    font-style: normal;
}

.imodel-footer__logo-text em {
    font-style: normal;
    color: var(--color-gold);
}

.imodel-footer__tagline {
    font-size: 0.85rem;
    line-height: 1.75;
    color: var(--color-text-muted);
    max-width: 260px;
    margin: 0 0 24px;
}

/* ── 微信二维码组（横排，最多3个） ──────────────────── */
.imodel-footer__wechat-group {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: flex-start;
}

.imodel-footer__wechat {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.imodel-footer__wechat-qr {
    width: 88px;
    height: 88px;
    border: none;
    border-radius: 5px;
    overflow: hidden;
    background: transparent;
    padding: 0;
    flex-shrink: 0;
}

.imodel-footer__wechat-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    border-radius: 3px;
}

.imodel-footer__wechat-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    font-size: 0.7rem;
    color: var(--color-text-muted) !important;
    margin: 0;
    text-align: center;
    max-width: 88px;
    line-height: 1.3;
}

.imodel-footer__wechat-label svg {
    width: 11px;
    height: 11px;
    stroke: var(--color-gold);
    flex-shrink: 0;
}

/* ── 链接列通用 ───────────────────────────────────── */
.imodel-footer__col {}

/* ★ Footer 标题 — 强制金色，对抗 WordPress/Elementor 全局覆盖 */
.imodel-footer .imodel-footer__col-title,
h3.imodel-footer__col-title {
    font-family: var(--font-body);
    font-size: 0.75rem !important;
    font-weight: 700 !important;
    color: var(--color-gold) !important;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin: 0 0 16px !important;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--color-border);
    line-height: 1.4;
}

.imodel-footer__col .menu {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.imodel-footer__col .menu-item a,
.imodel-footer__col .menu-item a:visited {
    font-size: 0.875rem;
    color: var(--color-text-muted) !important;
    text-decoration: none !important;
    transition: color var(--transition-fast);
    line-height: 1.4;
}

.imodel-footer__col .menu-item a:hover,
.imodel-footer__col .menu-item a:focus {
    color: var(--color-gold-light) !important;
    text-decoration: none !important;
}

/* ── 底部版权 & 备案栏 ────────────────────────────── */
.imodel-footer__bottom {
    border-top: 1px solid var(--color-border);
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 18px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}

.imodel-footer__copyright {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    white-space: nowrap;
}

.imodel-footer__copyright a {
    color: rgba(255,255,255,0.75);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.imodel-footer__copyright a:hover { color: var(--color-gold-light); }

/* 备案信息组 */
.imodel-footer__beian {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.imodel-footer__beian-item {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.78rem;
    color: var(--color-text-muted) !important;
    text-decoration: none !important;
    transition: color var(--transition-fast);
    white-space: nowrap;
}

.imodel-footer__beian-item svg {
    width: 13px;
    height: 13px;
    stroke: var(--color-text-muted);
    flex-shrink: 0;
    transition: stroke var(--transition-fast);
}

.imodel-footer__beian-item:hover,
.imodel-footer__beian-item:focus {
    color: var(--color-gold-light) !important;
    text-decoration: none !important;
}

.imodel-footer__beian-item:hover svg,
.imodel-footer__beian-item:focus svg {
    stroke: var(--color-gold-light);
}

/* 法律链接 */
.imodel-footer__legal {
    display: flex;
    gap: 16px;
    list-style: none;
    margin: 0;
    padding: 0;
    flex-shrink: 0;
}

.imodel-footer__legal li a {
    font-size: 0.78rem;
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
    white-space: nowrap;
}

.imodel-footer__legal li a:hover { color: var(--color-gold-light); }

/* ── Footer 响应式 ────────────────────────────────── */
@media (max-width: 960px) {
    .imodel-footer__body {
        grid-template-columns: 1fr 1fr;
        gap: 36px 32px;
    }
    .imodel-footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 600px) {
    .imodel-footer__body {
        grid-template-columns: 1fr;
        padding: 40px 20px 32px;
    }
    .imodel-footer__brand { grid-column: auto; }
    .imodel-footer__bottom {
        padding: 14px 20px;
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    .imodel-footer__beian { gap: 12px; }
}