/* 锚点跳转：预留置顶菜单栏高度，避免标题被遮挡 */
section[id],
.about-block[id] {
    scroll-margin-top: 92px;
}
/* ========== 基础变量 ========== */
:root {
    /* 银灰蓝调 · 高级感配色（slate 系） */
    --color-bg: #F4F6F9;
    --color-surface: #FFFFFF;
    --color-text: #171A1F;
    --color-text-secondary: #5A6470;
    --color-text-muted: #8E97A5;
    --color-border: #E2E7EE;
    --color-accent: #66788E;
    --color-accent-dark: #4C5D73;
    --color-accent-light: #EEF2F7;
    --color-dark: #232A36;
    --color-dark-light: #2C3542;
    /* 全站统一使用无衬线字体（assets 内置 Noto Sans SC） */
    --font-serif: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;

    /* 字号阶梯（px）：正文与标题的唯一取值来源，消除零散孤儿值。
       各媒体查询内的缩放值仍用裸 px，便于按断点独立微调。 */
    --fs-64: 64px;   /* 首页主视觉标题 */
    --fs-44: 44px;   /* 内页主标题 */
    --fs-40: 40px;   /* 章节标题 / 主强调数字 */
    --fs-36: 36px;   /* 次级强调数字 */
    --fs-32: 32px;   /* 区块标题 / CTA 标题 */
    --fs-28: 28px;   /* 服务项标题 */
    --fs-24: 24px;   /* 卡片标题 / 品牌名 */
    --fs-20: 20px;   /* 小标题 / 引导语 */
    --fs-18: 18px;   /* 副标题 / 强调正文 */
    --fs-16: 16px;   /* 正文（主） */
    --fs-15: 15px;   /* 正文（次）/ 按钮 / 导航 */
    --fs-14: 14px;   /* 辅助说明 */
    --fs-13: 13px;   /* 标签 / 提示 */
    --fs-12: 12px;   /* 微标签 */

    --radius: 6px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 3px rgba(20, 28, 40, 0.05);
    --shadow: 0 8px 30px rgba(20, 28, 40, 0.07);
    --shadow-lg: 0 20px 50px rgba(20, 28, 40, 0.12);
    --transition: all 0.3s ease;
    --container: 1200px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ========== 工具类 ========== */
.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 120px 0;
}

.section-header {
    margin-bottom: 72px;
}

.section-header.center {
    text-align: center;
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}

.section-label {
    display: inline-block;
    font-family: var(--font-serif);
    font-size: var(--fs-13);
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 16px;
}

.section-title {
    font-family: var(--font-serif);
    font-size: var(--fs-40);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 20px;
}

.section-sub {
    font-size: var(--fs-18);
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.section-header.light .section-title,
.section-header.light .section-sub {
    color: #fff;
}

.section-header.light .section-sub {
    opacity: 0.75;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: var(--radius);
    font-weight: 500;
    font-size: var(--fs-15);
    transition: var(--transition);
    cursor: pointer;
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

.btn-primary:hover {
    background: var(--color-accent-dark);
    border-color: var(--color-accent-dark);
}

.btn-outline-light {
    background: transparent;
    color: #fff;
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #fff;
}

.btn-sm {
    padding: 10px 22px;
    font-size: var(--fs-14);
}

.btn-block {
    width: 100%;
}

/* ========== 导航 ========== */
.header {
    /* 实体置顶菜单：页面内容（含轮播图/视频）从菜单栏下方开始，不再覆盖菜单栏 */
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    background: rgba(255, 255, 255, 0.78);
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(20px) saturate(1.4);
    -webkit-backdrop-filter: blur(20px) saturate(1.4);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 12px;
}

.logo-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

/* 公司 Logo：正方形 PNG，紧跟在「拾年毕业季」标题右侧 */
.logo-mark {
    display: block;
    width: 52px;
    height: 52px;
    flex-shrink: 0;
    object-fit: contain;
    object-position: center;
}

.logo-cn {
    font-family: var(--font-serif);
    font-size: var(--fs-24);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: 1px;
    color: var(--color-text);
}

/* 顶部菜单栏：品牌文字略小，与放大的 logo 图标配比更协调 */
.header .logo-cn {
    font-size: 22px;
}

.logo-en {
    font-size: 10px;
    letter-spacing: 2px;
    color: var(--color-text-muted);
    margin-top: 2px;
}

.logo-light .logo-cn,
.logo-light .logo-en {
    color: #fff;
}

.nav {
    display: flex;
    align-items: center;
    gap: 36px;
}

.nav-link {
    position: relative;
    font-size: var(--fs-15);
    color: rgba(26, 26, 26, 0.85);
    padding: 6px 0;
    transition: var(--transition);
}

.header.scrolled .nav-link,
.nav-link {
    color: var(--color-text);
}

.nav-link::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-accent);
}

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

.nav-cta {
    margin-left: 12px;
}

/* ========== 导航「解决方案」下拉菜单 ========== */
.nav-item {
    position: relative;
}

.nav-trigger {
    background: none;
    border: none;
    font: inherit;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.nav-trigger .nav-caret {
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid currentColor;
    transition: transform 0.25s ease;
}

.nav-item.open .nav-trigger .nav-caret {
    transform: rotate(180deg);
}

.nav-dropdown {
    position: absolute;
    top: calc(100% + 12px);
    left: 50%;
    transform: translate(-50%, 8px);
    min-width: 196px;
    padding: 8px;
    background: rgba(255, 255, 255, 0.86);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(16px) saturate(1.4);
    -webkit-backdrop-filter: blur(16px) saturate(1.4);
    display: flex;
    flex-direction: column;
    gap: 2px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
    z-index: 1001;
}

/* 悬停桥接：填补菜单项与面板之间的空隙，避免鼠标移入过程中面板收起 */
.nav-dropdown::before {
    content: '';
    position: absolute;
    top: -12px;
    left: 0;
    right: 0;
    height: 12px;
}

.nav-item.open .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, 0);
}

.nav-dropdown a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    font-size: var(--fs-14);
    color: var(--color-text);
    border-radius: var(--radius);
    transition: background 0.2s ease, color 0.2s ease;
    white-space: nowrap;
}

.nav-dropdown a:hover {
    background: var(--color-accent-light);
    color: var(--color-accent-dark);
}

.nav-dropdown a.current {
    color: var(--color-accent);
    font-weight: 600;
}

.nav-dropdown .dd-en {
    margin-left: auto;
    font-size: var(--fs-12);
    letter-spacing: 0.4px;
    color: var(--color-text-muted);
    text-transform: uppercase;
}

/* ========== 回到顶部按钮（全站） ========== */
.back-to-top {
    position: fixed;
    right: 28px;
    bottom: 32px;
    z-index: 900;
    width: 46px;
    height: 46px;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    background: var(--color-surface);
    color: var(--color-accent);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s, background 0.3s ease, color 0.3s ease;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-accent);
    color: #fff;
}

@media (max-width: 768px) {
    .back-to-top {
        right: 16px;
        bottom: 20px;
        width: 42px;
        height: 42px;
    }
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition);
}

/* 移动端菜单 */
.mobile-menu {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    z-index: 999;
    padding: 100px 32px 40px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.mobile-menu.open {
    opacity: 1;
    pointer-events: auto;
}

.mobile-menu-inner {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.mobile-link {
    font-family: var(--font-serif);
    font-size: var(--fs-24);
    color: var(--color-text);
    padding: 8px 0;
    border-bottom: 1px solid var(--color-border);
}

/* ========== 首页轮播 ========== */
.hero {
    position: relative;
    /* 78px 约为置顶菜单栏高度，保证首屏在视口内完整呈现 */
    height: calc(100vh - 78px);
    min-height: 620px;
    overflow: hidden;
    background: var(--color-dark);
}

.hero-slides {
    position: absolute;
    inset: 0;
}

.hero-slide {
    position: absolute;
    inset: 0;
    background-image: var(--bg, none);
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 1s ease-in-out;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-slide.active {
    opacity: 1;
}

/* 轮播图背景：变量在 CSS 内定义，url 相对本文件（css/）解析，避免内联变量相对页面路径错误 */
.hero-slide:nth-child(1) {
    --bg: url('../assets/01-home/hero-01-grid.webp');
}

.hero-slide:nth-child(2) {
    --bg: url('../assets/01-home/hero-02-premium.webp');
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: rgba(35, 42, 54, 0.42);
}

.hero-slide-grad {
    background: linear-gradient(135deg, #232A36 0%, #2E3744 50%, #3D4857 100%);
}

.hero-slide-grad .hero-overlay {
    background: linear-gradient(to right, rgba(35, 42, 54, 0.66), rgba(35, 42, 54, 0.2));
}

.hero-slide-video {
    background: linear-gradient(135deg, #2E3744 0%, #232A36 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: #fff;
    max-width: 880px;
    padding: 0 24px;
}

.hero-label {
    display: inline-block;
    font-size: var(--fs-13);
    letter-spacing: 3px;
    text-transform: uppercase;
    color: #FFFFFF;
    margin-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.55);
    padding-bottom: 8px;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: var(--fs-64);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
    text-wrap: balance;
}

.hero-desc {
    font-size: var(--fs-20);
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 40px;
    letter-spacing: 1px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* 宣传片：全屏铺满（与背景图视觉一致），进入该幻灯片时自动播放 */
.hero-video-wrap {
    position: absolute;
    inset: 0;
    z-index: 1;
    overflow: hidden;
}

.hero-video {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: #000;
}

.hero-slide-video .hero-overlay {
    z-index: 2;
}

.hero-content-overlay {
    position: absolute;
    bottom: 120px;
    left: 50%;
    transform: translateX(-50%);
    top: auto;
    z-index: 3;
    width: 100%;
    max-width: 880px;
    padding: 0 24px;
    box-sizing: border-box;
    text-align: center;
    color: #fff;
}

/* 宣传片文字：仅在视频首次开始播放时显示一次，几秒后淡出消失 */
.hero-content-fade {
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.hero-content-fade.is-hidden {
    opacity: 0;
    transform: translate(-50%, 10px);
    pointer-events: none;
}

/* 取消/恢复静音按钮（首页 hero-03 视频右下角） */
.hero-unmute-btn {
    position: absolute;
    bottom: 36px;
    right: 40px;
    z-index: 4;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: 100px;
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: #fff;
    font-size: var(--fs-13);
    font-weight: 500;
    cursor: pointer;
    backdrop-filter: blur(6px);
    transition: background 0.25s ease, transform 0.25s ease, border-color 0.25s ease;
}

.hero-unmute-btn:hover {
    background: rgba(0, 0, 0, 0.7);
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.hero-unmute-btn .ico-unmute { display: none; }
.hero-unmute-btn.is-unmuted .ico-mute { display: none; }
.hero-unmute-btn.is-unmuted .ico-unmute { display: inline-block; }

/* 全屏播放按钮（左下角）：仅触屏设备显示，桌面保留原生全屏控件 */
.hero-fullscreen-btn {
    position: absolute;
    bottom: 36px;
    left: 40px;
    z-index: 4;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: #fff;
    cursor: pointer;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    transition: background 0.25s ease, transform 0.25s ease, border-color 0.25s ease;
}

.hero-fullscreen-btn:hover {
    background: rgba(0, 0, 0, 0.7);
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.hero-fullscreen-btn[hidden] { display: none; }

@media (hover: none) {
    .hero-fullscreen-btn { display: inline-flex; }
}

/* 宣传片播放按钮（点击才播放；未播放时显示在画面中央，播放后隐藏） */
.hero-play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 4;
    width: 84px;
    height: 84px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-left: 4px;
    background: rgba(255, 255, 255, 0.16);
    border: 2px solid rgba(255, 255, 255, 0.65);
    color: #fff;
    cursor: pointer;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
    transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease, opacity 0.3s ease;
}

.hero-play-btn:hover {
    background: rgba(255, 255, 255, 0.32);
    border-color: #fff;
    transform: translate(-50%, -50%) scale(1.08);
}

.hero-play-btn[hidden] { display: none; }

/* 轮播控制 */
.hero-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 3;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.hero-arrow:hover {
    background: rgba(255, 255, 255, 0.2);
}

.hero-arrow-prev {
    left: 32px;
}

.hero-arrow-next {
    right: 32px;
}

.hero-dots {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    display: flex;
    gap: 12px;
}

.hero-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.35);
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.hero-dot.active {
    background: var(--color-accent);
    transform: scale(1.2);
}

/* 轮播 / 视频进度条（视频幻灯片激活时可点击、拖动控制） */
.hero-progress-track {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 18px;
    z-index: 3;
    cursor: pointer;
}

.hero-progress-track::before {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    height: 6px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.3);
}

.hero-progress {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    height: 6px;
    border-radius: 4px;
    /* 亮青蓝渐变：与全站银灰蓝同色系，比主色更亮眼，光晕提升可见度 */
    background: linear-gradient(90deg, #7FA8C9 0%, #6FC6EC 55%, #A9E2F8 100%);
    box-shadow: 0 0 14px rgba(110, 195, 235, 0.9), 0 0 4px rgba(255, 255, 255, 0.55);
    width: 0%;
    z-index: 1;
    transition: width 0.1s linear, height 0.2s ease;
}

.hero-progress-track:hover .hero-progress {
    height: 9px;
}

/* 宣传片小窗：视频随页面滚动滚出视口后，右下角迷你播放；播完自动关闭 */
.hero-mini-player {
    position: fixed;
    right: 28px;
    bottom: 96px;
    width: 360px;
    aspect-ratio: 16 / 9;
    z-index: 1000;
    border-radius: 12px;
    overflow: hidden;
    background: #000;
    box-shadow: 0 12px 40px rgba(15, 23, 42, 0.35);
    opacity: 0;
    transform: translateY(16px) scale(0.94);
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.hero-mini-player.active {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.hero-mini-player video {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-mini-close {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 26px;
    height: 26px;
    z-index: 2;
    border: none;
    border-radius: 50%;
    background: rgba(15, 23, 42, 0.55);
    color: #fff;
    font-size: 18px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.25s ease;
}

.hero-mini-close:hover {
    background: rgba(15, 23, 42, 0.8);
}

@media (max-width: 640px) {
    .hero-mini-player {
        right: 16px;
        bottom: 84px;
        width: min(320px, calc(100vw - 32px));
    }
}

/* ========== 信任条 ========== */
.trust-bar {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 60px 0;
}

.trust-inner {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    text-align: center;
}

.trust-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.trust-item strong {
    font-family: var(--font-serif);
    font-size: var(--fs-40);
    font-weight: 700;
    color: var(--color-accent);
    line-height: 1;
}

.trust-item strong span {
    font-size: var(--fs-18);
    margin-left: 4px;
}

.trust-item > span:last-child {
    font-size: var(--fs-15);
    color: var(--color-text-secondary);
}

/* ========== 解决方案 ========== */
.section-solutions {
    background: var(--color-bg);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.solution-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 48px;
    transition: var(--transition);
}

.solution-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.solution-card h3 {
    font-family: var(--font-serif);
    font-size: var(--fs-24);
    margin-bottom: 12px;
}

.solution-card > p {
    color: var(--color-text-secondary);
    margin-bottom: 28px;
    font-size: var(--fs-15);
}

.solution-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px 24px;
}

.solution-list li {
    position: relative;
    padding-left: 18px;
    font-size: var(--fs-15);
    color: var(--color-text);
}

.solution-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-accent);
}

/* ========== 服务标准 ========== */
.section-standards {
    background: var(--color-dark);
    color: #fff;
}

.standards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.standard-card {
    background: var(--color-dark-light);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-lg);
    padding: 44px;
    transition: var(--transition);
}

.standard-card:hover {
    border-color: rgba(147, 168, 190, 0.4);
}

.standard-card h3 {
    font-family: var(--font-serif);
    font-size: var(--fs-24);
    margin-bottom: 16px;
}

.standard-card > p {
    color: rgba(255, 255, 255, 0.65);
    font-size: var(--fs-15);
    margin-bottom: 28px;
}

.standard-card ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.standard-card li {
    position: relative;
    padding-left: 20px;
    font-size: var(--fs-14);
    color: rgba(255, 255, 255, 0.8);
}

.standard-card li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-accent);
}

/* ========== 关于我们 ========== */
.section-about {
    background: var(--color-bg);
}

.about-block {
    margin-bottom: 100px;
}

.about-block:last-child {
    margin-bottom: 0;
}

.block-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 52px;
}

.block-header h3 {
    font-family: var(--font-serif);
    font-size: var(--fs-32);
    margin-bottom: 14px;
}

.block-header p {
    color: var(--color-text-secondary);
    font-size: var(--fs-16);
}

/* 时间轴 */
.timeline {
    /* 8 个年份节点，取 4 列 → 正好 2 行，每行都能铺满整条刻度线 */
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px 24px;
    position: relative;
}

.timeline-item {
    position: relative;
    padding-top: 56px;
    text-align: center;
}

/* 刻度线：由每个节点各画一段，向左右各延伸半个列间距（gap 24px → 12px），
   相邻节点的线段正好首尾相接，因此无论几列几行都连贯不断。
   比容器整体画一条横线更稳：节点数与列数不一致时也不会出现第二行没有线。 */
.timeline-item::before {
    content: '';
    position: absolute;
    top: 24px;            /* 对齐 48px 年份圆圈的中心 */
    left: -12px;
    right: -12px;
    height: 1px;
    background: var(--color-border);
    z-index: 0;
}

/* 每行的首尾节点贴着容器边缘，线段不外溢。
   省掉 overflow: hidden —— 那会把 fade-up 的位移裁掉。 */
.timeline-item:nth-child(4n + 1)::before {
    left: 0;
}

.timeline-item:nth-child(4n)::before {
    right: 0;
}

.timeline-year {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-accent);
    font-family: var(--font-serif);
    font-size: var(--fs-14);
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
}

.timeline-content h4 {
    font-size: var(--fs-18);
    margin-bottom: 8px;
}

.timeline-content p {
    font-size: var(--fs-14);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* 业务覆盖 */
.coverage-map {
    display: flex;
    justify-content: center;
}

.coverage-map-placeholder {
    width: 100%;
    max-width: 920px;
    aspect-ratio: 4 / 3;
    background-color: var(--color-surface);
    border: 1.5px dashed var(--color-border);
    border-radius: var(--radius-lg);
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    gap: 10px;
    padding: 40px;
    text-align: center;
    overflow: hidden;
    position: relative;
}

.coverage-map-placeholder.has-photo {
    border: none;
    padding: 24px;
}

.coverage-map-placeholder.has-photo > span,
.coverage-map-placeholder.has-photo > small {
    display: none;
}

.coverage-map-placeholder span {
    font-family: var(--font-serif);
    font-size: var(--fs-20);
    color: var(--color-text);
}

.coverage-map-placeholder small {
    font-size: var(--fs-13);
    color: var(--color-text-muted);
    line-height: 1.7;
    max-width: 420px;
}

.coverage-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.coverage-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px;
    text-align: center;
    transition: var(--transition);
}

.coverage-card:hover {
    border-color: var(--color-accent);
}

.coverage-region {
    display: block;
    font-family: var(--font-serif);
    font-size: var(--fs-20);
    color: var(--color-accent);
    margin-bottom: 10px;
}

.coverage-cities {
    font-size: var(--fs-14);
    color: var(--color-text-secondary);
}

/* 公司环境 */
.environment-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 24px;
}

.env-card {
    border-radius: var(--radius-lg);
    overflow: hidden;
    min-height: 320px;
}

.env-placeholder {
    width: 100%;
    height: 100%;
    min-height: 320px;
    background: linear-gradient(135deg, #EDF1F6, #DCE2EA);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    gap: 8px;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.env-placeholder.has-photo {
    background-color: var(--color-bg);
    color: transparent;
}

.env-placeholder.has-photo > span,
.env-placeholder.has-photo > small {
    display: none;
}

.env-placeholder span {
    font-family: var(--font-serif);
    font-size: var(--fs-20);
    color: var(--color-text);
}

.env-placeholder.has-photo span {
    color: #fff;
}

.env-placeholder small {
    font-size: var(--fs-13);
}

/* 团队 */
.team-photo {
    max-width: 1120px;
    margin: 0 auto 48px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
}

.team-photo-placeholder {
    width: 100%;
    /* 与客户评价一致：16:9 画布比例（1120 宽 × 630 高） */
    aspect-ratio: 16 / 9;
    background: linear-gradient(135deg, #EDF1F6, #DCE2EA);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    gap: 8px;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    padding: 60px 24px;
}

.team-photo-placeholder.has-photo {
    /* cover 模式铺满画布不留白，超出部分按中心裁切 */
    background-color: var(--color-surface);
    background-size: cover;
    color: transparent;
    padding: 0;
}

.team-photo-placeholder.has-photo > span,
.team-photo-placeholder.has-photo > small {
    display: none;
}

.team-photo-placeholder.has-photo span {
    color: #fff;
}

.team-photo-placeholder span {
    font-family: var(--font-serif);
    font-size: var(--fs-28);
    color: var(--color-text);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

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

.team-avatar {
    width: 180px;
    height: 220px;
    border-radius: var(--radius);
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-serif);
    font-size: var(--fs-44);
    color: #fff;
    background: var(--color-accent);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

.team-avatar.has-photo {
    color: transparent;
    text-indent: -9999px;
}

.avatar-2 { background: #7C8FA5; }
.avatar-3 { background: #8AA0B8; }
.avatar-4 { background: #6B7E95; }

.team-card h4 {
    font-size: var(--fs-18);
    margin-bottom: 4px;
}

.team-role {
    display: block;
    font-size: var(--fs-13);
    color: var(--color-accent);
    margin-bottom: 12px;
}

.team-card p {
    font-size: var(--fs-14);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ========== 联系我们 ========== */
.section-contact {
    background: var(--color-dark);
    color: #fff;
    padding-bottom: 100px;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 48px;
    max-width: 980px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-cards-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.contact-card {
    display: flex;
    align-items: flex-start;
    gap: 18px;
    background: var(--color-dark-light);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius);
    padding: 24px;
    transition: var(--transition);
}

.contact-card:hover {
    border-color: rgba(147, 168, 190, 0.4);
}

.contact-label {
    display: block;
    font-size: var(--fs-15);
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 6px;
    font-weight: 600;
}

.contact-value {
    display: block;
    font-size: var(--fs-13);
    font-weight: 400;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.65);
    word-break: break-word;
}

.contact-value-sub {
    display: inline-block;
    font-size: var(--fs-12);
    color: rgba(255, 255, 255, 0.45);
}

/* 关注我们 / 二维码 */
.contact-social {
    background: var(--color-dark-light);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius);
    padding: 28px 24px;
}

.contact-social-title {
    font-family: var(--font-serif);
    font-size: var(--fs-18);
    color: #fff;
    margin-bottom: 20px;
}

.contact-social-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.qr-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 6px;
}

.qr-box {
    width: 200px;
    height: 200px;
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.06);
    border: 1px dashed rgba(255, 255, 255, 0.25);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    color: rgba(255, 255, 255, 0.45);
    margin-bottom: 8px;
    overflow: hidden;
    transition: var(--transition);
}

.qr-box:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.qr-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.qr-box small {
    font-size: var(--fs-12);
}

.qr-name {
    font-size: var(--fs-14);
    color: #fff;
    font-weight: 500;
}

.qr-hint {
    font-size: var(--fs-12);
    color: rgba(255, 255, 255, 0.5);
}

/* ========== 页脚 ========== */
.footer {
    background: #1E2430;
    color: rgba(255, 255, 255, 0.65);
    padding: 80px 0 32px;
}

.footer-inner {
    display: flex;
    flex-direction: column;
    gap: 60px;
}

.footer-main {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
}

.footer-brand p {
    font-size: var(--fs-14);
    line-height: 1.8;
    margin-top: 16px;
    max-width: 320px;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links h4 {
    color: #fff;
    font-size: var(--fs-15);
    margin-bottom: 8px;
    font-weight: 600;
}

.footer-links a,
.footer-links p {
    font-size: var(--fs-14);
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.7;
}

.footer-links a {
    display: block;
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 28px;
    text-align: center;
    font-size: var(--fs-13);
    color: rgba(255, 255, 255, 0.45);
}

.footer-icp {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.footer-icp a {
    color: rgba(255, 255, 255, 0.45);
    transition: var(--transition);
}

.footer-icp a:hover {
    color: var(--color-accent);
}

.footer-sep {
    color: rgba(255, 255, 255, 0.25);
}

/* ========== 动画 ========== */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .mobile-menu {
        display: block;
    }

    .hero-title {
        font-size: 48px;
    }

    .solutions-grid,
    .standards-grid,
    .coverage-grid,
    .team-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .timeline {
        /* 2 列 × 4 行正好铺满 8 个节点，每行横线连贯不断 */
        grid-template-columns: repeat(2, 1fr);
        gap: 36px 24px;
    }

    /* 2 列时每行首节点（奇数）贴左边缘、尾节点（偶数）贴右边缘，横线首尾相接 */
    .timeline-item:nth-child(odd)::before {
        left: 0;
    }

    .timeline-item:nth-child(even)::before {
        right: 0;
    }

    .environment-grid {
        grid-template-columns: 1fr 1fr;
    }

    .env-wide {
        grid-column: span 2;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    /* 移动端（≤1024px）：信息卡与二维码改为 2 列，二维码宽度自适应，避免 4 列 200px 固定宽溢出屏幕 */
    .contact-cards-row {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .contact-social-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .qr-box {
        width: 100%;
        height: auto;
        max-width: 200px;
        aspect-ratio: 1 / 1;
        margin: 0 auto 8px;
    }

    .footer-main {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 80px 0;
    }

    .section-title {
        font-size: 32px;
    }

    .hero {
        min-height: 640px;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-desc {
        font-size: 16px;
    }

    .hero-content-overlay {
        bottom: 100px;
    }


    .trust-inner {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px 16px;
    }

    .trust-item strong {
        font-size: 32px;
    }

    .solutions-grid,
    .standards-grid,
    .coverage-grid,
    .team-grid,
    .environment-grid {
        grid-template-columns: 1fr;
    }

    .env-wide {
        grid-column: span 1;
    }

    .solution-card {
        padding: 32px;
    }

    .solution-list {
        grid-template-columns: 1fr;
    }

    .timeline {
        grid-template-columns: 1fr;
        text-align: left;
    }

    .timeline-item {
        padding-top: 0;
        padding-left: 64px;
        min-height: 80px;
    }

    .timeline-year {
        left: 0;
        transform: none;
    }

    /* 1 列布局：容器左侧画一条连续竖线（穿过行间距，不分段） */
    .timeline::before {
        content: '';
        position: absolute;
        left: 24px;
        top: 24px;
        bottom: 24px;
        width: 1px;
        background: var(--color-border);
    }

    /* 关掉每个节点各自的横线段，避免与竖线叠加 */
    .timeline-item::before {
        display: none;
    }

    .contact-cards-row {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .contact-card {
        padding: 16px;
        gap: 12px;
    }

    .footer-main {
        grid-template-columns: 1fr;
        gap: 36px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }

    .section-title {
        font-size: 28px;
    }

    .trust-inner {
        grid-template-columns: 1fr;
    }

    .contact-card {
        padding: 14px;
        gap: 10px;
    }

    .contact-value {
        font-size: 12px;
    }

    .qr-box {
        max-width: 150px;
    }

    .contact-social {
        padding: 20px 16px;
    }
}

/* ========== 解决方案卡片链接态 ========== */
a.solution-card {
    display: block;
    color: inherit;
    text-decoration: none;
}

.solution-more {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 28px;
    padding-top: 22px;
    border-top: 1px solid var(--color-border);
    font-size: var(--fs-14);
    font-weight: 500;
    color: var(--color-accent);
    transition: var(--transition);
}

.solution-more .arrow {
    transition: transform 0.3s ease;
}

a.solution-card:hover .solution-more .arrow {
    transform: translateX(4px);
}

/* ========== 子方案详情页 ========== */
.page-hero {
    position: relative;
    padding: 80px 0 80px;
    background: var(--color-dark);
    color: #fff;
    overflow: hidden;
}

.page-hero::before {
    content: '';
    position: absolute;
    right: -120px;
    top: -120px;
    width: 420px;
    height: 420px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(102, 120, 142, 0.28) 0%, transparent 70%);
}

.page-hero::after {
    content: '';
    position: absolute;
    left: -80px;
    bottom: -160px;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(102, 120, 142, 0.14) 0%, transparent 70%);
}

.page-hero .container {
    position: relative;
    z-index: 1;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: var(--fs-13);
    color: rgba(255, 255, 255, 0.55);
    margin-bottom: 24px;
}

.breadcrumb a {
    color: rgba(255, 255, 255, 0.55);
    text-decoration: none;
    transition: var(--transition);
}

.breadcrumb a:hover {
    color: var(--color-accent);
}

.breadcrumb .sep {
    color: rgba(255, 255, 255, 0.3);
}

.breadcrumb .current {
    color: #fff;
}

.page-hero-label {
    font-size: var(--fs-13);
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 16px;
}

.page-hero-title {
    font-family: var(--font-serif);
    font-size: var(--fs-44);
    font-weight: 700;
    margin-bottom: 18px;
    line-height: 1.2;
}

.page-hero-desc {
    max-width: 640px;
    font-size: var(--fs-16);
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.72);
}

/* 方案概述 */
.detail-overview {
    padding: 90px 0;
    background: var(--color-bg);
}

.detail-overview-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 60px;
    align-items: start;
}

.detail-overview-text p {
    font-size: var(--fs-16);
    line-height: 1.9;
    color: var(--color-text-secondary);
    margin-bottom: 20px;
}

.detail-overview-aside {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px;
}

.detail-overview-aside h3 {
    font-family: var(--font-serif);
    font-size: var(--fs-20);
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
}

.overview-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.overview-tag {
    display: inline-block;
    padding: 7px 16px;
    border-radius: 100px;
    background: var(--color-accent-light);
    color: var(--color-accent-dark);
    font-size: var(--fs-13);
    font-weight: 500;
}

/* 子服务与示例 */
.section-services {
    padding: 90px 0;
    background: var(--color-surface);
}

.service-item {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 48px;
    padding: 48px 0;
    border-bottom: 1px solid var(--color-border);
    align-items: center;
}

.service-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.service-item:first-of-type {
    padding-top: 24px;
}

.service-info h3 {
    font-family: var(--font-serif);
    font-size: var(--fs-28);
    margin-bottom: 14px;
}

.service-info p {
    font-size: var(--fs-15);
    line-height: 1.8;
    color: var(--color-text-secondary);
}

.service-info ul {
    margin-top: 18px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.service-info ul li {
    padding: 5px 14px;
    border-radius: 4px;
    background: var(--color-accent-light);
    color: var(--color-accent-dark);
    font-size: var(--fs-13);
    font-weight: 500;
}

/* 示例预留位 */
.example-placeholder {
    position: relative;
    border-radius: var(--radius-lg);
    border: 1.5px dashed #D3DAE3;
    background: repeating-linear-gradient(45deg, #F6F8FB, #F6F8FB 12px, #EDF1F6 12px, #EDF1F6 24px);
    min-height: 280px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    text-align: center;
    padding: 30px;
    transition: var(--transition);
    overflow: hidden;
}

.example-placeholder:hover {
    border-color: var(--color-accent);
}

.example-placeholder.has-photo {
    border: none;
    padding: 0;
    background: transparent;
}

.example-placeholder.has-photo > *:not(.example-photo) {
    display: none;
}

.example-placeholder .example-photo {
    display: none;
    width: 100%;
    height: 100%;
    min-height: 280px;
    object-fit: cover;
}

.example-placeholder.has-photo .example-photo {
    display: block;
}

.example-placeholder .example-icon {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--color-accent-light);
    color: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
}

.example-placeholder .example-title {
    font-family: var(--font-serif);
    font-size: var(--fs-18);
    color: var(--color-text);
}

.example-placeholder .example-hint {
    font-size: var(--fs-13);
    color: var(--color-text-muted);
    line-height: 1.7;
    max-width: 340px;
}

/* 详情页 CTA */
.cta-banner {
    padding: 90px 0;
    background: linear-gradient(135deg, #EEF2F7 0%, #E2E9F1 100%);
    color: var(--color-text);
    text-align: center;
}

.cta-banner h2 {
    font-family: var(--font-serif);
    font-size: var(--fs-32);
    margin-bottom: 16px;
    text-wrap: balance;
}

.cta-banner p {
    color: var(--color-text-secondary);
    margin-bottom: 32px;
    font-size: var(--fs-16);
}

.cta-banner .btn + .btn {
    margin-left: 14px;
}

/* 浅色底上的电话按钮（覆盖 .btn-outline-light 的白字白边） */
.cta-banner .btn-outline-light {
    color: var(--color-accent-dark);
    border-color: var(--color-accent);
    background: transparent;
}

.cta-banner .btn-outline-light:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: #fff;
}

@media (max-width: 992px) {
    .detail-overview-grid {
        grid-template-columns: 1fr;
        gap: 36px;
    }

    .service-item {
        grid-template-columns: 1fr;
        gap: 28px;
    }
}

@media (max-width: 768px) {
    .page-hero {
        padding: 120px 0 64px;
    }

    .page-hero-title {
        font-size: 32px;
    }
}

/* ========== 视频示例位（校园影视宣传详情页） ========== */
.example-video {
    position: relative;
    border-radius: var(--radius-lg);
    border: 1.5px dashed #D3DAE3;
    background: repeating-linear-gradient(45deg, #F6F8FB, #F6F8FB 12px, #EDF1F6 12px, #EDF1F6 24px);
    min-height: 280px;
    overflow: hidden;
    transition: var(--transition);
}

.example-video .ev-pending {
    min-height: 280px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    text-align: center;
    padding: 30px;
}

.example-video .ev-pending .example-icon {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--color-accent-light);
    color: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
}

.example-video .ev-pending .example-title {
    font-family: var(--font-serif);
    font-size: var(--fs-18);
    color: var(--color-text);
}

.example-video .ev-pending .example-hint {
    font-size: var(--fs-13);
    color: var(--color-text-muted);
    line-height: 1.7;
    max-width: 340px;
}

/* mp4 就位后：显示海报 + 播放按钮，隐藏待上传提示 */
.example-video.has-video {
    border-style: solid;
    border-color: var(--color-border);
    background: #000;
}

.example-video.has-video .ev-pending {
    display: none;
}

.example-video:not(.has-video) .ev-video,
.example-video:not(.has-video) .ev-play-btn {
    display: none;
}

.example-video .ev-video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: #000;
}

.example-video .ev-play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
    width: 72px;
    height: 72px;
    border-radius: 50%;
    border: none;
    background: rgba(102, 120, 142, 0.92);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 32px rgba(0, 0, 0, 0.35);
    transition: transform 0.3s ease, background 0.3s ease;
}

.example-video .ev-play-btn svg {
    margin-left: 3px;
}

.example-video .ev-play-btn:hover {
    transform: translate(-50%, -50%) scale(1.08);
    background: var(--color-accent);
}

/* 播放中：隐藏播放按钮，让原生 controls 接管 */
.example-video.is-playing .ev-play-btn {
    opacity: 0;
    pointer-events: none;
}

/* 播放中：无论就位检测是否成功，都不再显示「待上传」文字提示 */
.example-video.is-playing .ev-pending {
    display: none;
}

@media (max-width: 992px) {
    .example-video .ev-pending,
    .example-video {
        min-height: 220px;
    }
}


/* ========== 整图展示位（详情页 service 01 等需要完整显示的图） ========== */
.example-wide {
    position: relative;
    width: 100%;
    /* 锁定 16:9 画布，按容器宽度自适应高度；contain 模式保证图片按原比例完整显示 */
    aspect-ratio: 16 / 9;
    border-radius: var(--radius-lg);
    border: 1.5px dashed #D3DAE3;
    background: #F6F8FB;
    overflow: hidden;
}

/* 院校团体照专用：大幅横幅团体照（如 3:1 / 4:1）需要更扁的画布，
   同时让 contain 模式按原比例完整显示，必要时给大图设 max-height 兜底避免拉爆页面 */
.example-wide-banner {
    aspect-ratio: 3 / 1;
    max-height: 1080px;/*600px;*/
}

.example-wide-banner.has-photo {
    /* 真实图加载后，容器比例已由 JS 跟随图片自适应；
       极端情况（如 max-height 兜底生效）下 cover 保证铺满容器、不留白 */
    background-color: var(--color-surface);
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center center;
    background-color: #F6F8FB;
}

.example-wide .ew-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    text-align: center;
    padding: 30px;
    color: var(--color-text-muted);
}

.example-wide.has-photo {
    border-style: solid;
    border-color: var(--color-border);
    background-color: var(--color-surface);
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center center;
}

.example-wide.has-photo > .ew-placeholder {
    display: none;
}

/* ========== 详情页子方案轮播（混动显示 N 张） ========== */
.example-carousel {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: var(--radius-lg);
    border: 1.5px dashed #D3DAE3;
    background: #F6F8FB;
    overflow: hidden;
}
.env-carousel {
    max-width: 1120px;
    margin: 0 auto;
}

.example-carousel .ec-slides {
    position: absolute;
    inset: 0;
}

.example-carousel .ec-slide {
    position: absolute;
    inset: 0;
    /* 深色兜底：图片未加载完成时显示深灰蓝，避免浅色背景造成的"留白"观感 */
    background-color: #232A36;
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    opacity: 0;
    transition: opacity 0.8s ease;
    pointer-events: none;
}

.example-carousel .ec-slide.active {
    opacity: 1;
    pointer-events: auto;
}

.example-carousel .ec-empty {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    text-align: center;
    padding: 30px;
    color: var(--color-text-muted);
    transition: opacity 0.3s ease;
    z-index: 1;
}

.example-carousel.has-photo .ec-empty {
    opacity: 0;
    pointer-events: none;
}

.example-carousel .ec-dots {
    position: absolute;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    z-index: 3;
    padding: 6px 12px;
    background: rgba(0, 0, 0, 0.35);
    border-radius: 100px;
    backdrop-filter: blur(6px);
}

.example-carousel .ec-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    border: none;
    padding: 0;
    cursor: pointer;
    transition: all 0.3s ease;
}

.example-carousel .ec-dot:hover {
    background: rgba(255, 255, 255, 0.8);
}

.example-carousel .ec-dot.active {
    background: #fff;
    width: 24px;
    border-radius: 4px;
}

/* 默认不静音的视频示例位：进度条和静音按钮依旧显示在原生控件 */
.example-video[data-unmuted] .ev-play-btn {
    /* 视觉无差异，仅标识 */
}

@media (max-width: 768px) {
    .example-carousel,
    .example-wide {
        aspect-ratio: 4 / 3;
    }
}

/* ========== 客户评价（首页） ========== */

.testimonial-slider {
    position: relative;
    max-width: 1120px;
    margin: 0 auto;
}
.testimonial-viewport {
    position: relative;
    aspect-ratio: 16 / 9;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-dark-light);
    box-shadow: var(--shadow-lg);
}
.testimonial-slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.8s ease;
    pointer-events: none;
}
.testimonial-slide.active {
    opacity: 1;
    pointer-events: auto;
}
.testimonial-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.testimonial-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 3;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.78);
    border: 1px solid var(--color-border);
    color: var(--color-accent-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}
.testimonial-arrow:hover {
    background: #fff;
    color: var(--color-accent);
    box-shadow: var(--shadow);
}
.testimonial-arrow-prev { left: 16px; }
.testimonial-arrow-next { right: 16px; }
.testimonial-dots {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 22px;
}
.testimonial-dot {
    width: 8px;
    height: 8px;
    padding: 0;
    border: none;
    border-radius: 50%;
    background: var(--color-border);
    cursor: pointer;
    transition: var(--transition);
}
.testimonial-dot.active {
    width: 26px;
    border-radius: 4px;
    background: var(--color-accent);
}
@media (max-width: 767px) {
    .testimonial-arrow {
        width: 40px;
        height: 40px;
    }
    .testimonial-arrow-prev { left: 10px; }
    .testimonial-arrow-next { right: 10px; }
}

/* ===== 客户评价灯箱 ===== */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 1200;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10, 14, 20, 0.92);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
}
.lightbox.open { opacity: 1; visibility: visible; }
.lightbox-stage {
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 94vw;
    max-height: 90vh;
}
.lightbox-stage img {
    display: block;
    max-width: 94vw;
    max-height: 90vh;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
    background: #ffffff;
}
.lightbox-close {
    position: absolute;
    top: 18px;
    right: 22px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
    cursor: pointer;
    transition: background 0.25s ease, transform 0.25s ease;
    z-index: 2;
}
.lightbox-close:hover { background: rgba(255, 255, 255, 0.24); transform: rotate(90deg); }
.lightbox-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
    cursor: pointer;
    transition: background 0.25s ease;
    z-index: 2;
}
.lightbox-arrow:hover { background: rgba(255, 255, 255, 0.24); }
.lightbox-prev { left: 22px; }
.lightbox-next { right: 22px; }
.lightbox-counter {
    position: absolute;
    bottom: 22px;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 16px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.14);
    color: rgba(255, 255, 255, 0.92);
    font-size: 13px;
    letter-spacing: 1px;
    z-index: 2;
}
/* 轮播图片可点击提示 */
.testimonial-slide img { cursor: zoom-in; }
.testimonial-hint {
    margin: 16px 0 0;
    text-align: center;
    font-size: 13px;
    color: var(--color-muted, #8a94a6);
    letter-spacing: 0.5px;
}
@media (max-width: 767px) {
    .lightbox-arrow { width: 42px; height: 42px; }
    .lightbox-prev { left: 10px; }
    .lightbox-next { right: 10px; }
    .lightbox-close { top: 12px; right: 12px; }
}

.hero-mini-mute {
    position: absolute;
    bottom: 8px;
    right: 8px;
    z-index: 2;
    border: none;
    border-radius: 6px;
    padding: 4px 10px;
    background: rgba(15, 23, 42, 0.55);
    color: #fff;
    font-size: 12px;
    line-height: 1.6;
    cursor: pointer;
    transition: background 0.25s ease;
}
.hero-mini-mute:hover { background: rgba(15, 23, 42, 0.78); }
.hero-mini-mute.is-unmuted { background: rgba(102, 120, 142, 0.78); }

/* 竖屏手机：与桌面一致 cover 铺满（不再 contain+模糊背板） */
@media (max-aspect-ratio: 3 / 4) {
    .hero-slide {
        background-size: cover;
    }

    .hero-slide-video {
        background-image: linear-gradient(135deg, #2E3744 0%, #232A36 100%);
    }

    .hero-video {
        position: relative;
        z-index: 1;
        object-fit: contain;
        background: transparent;
    }
}


/* ========== 移动端 / 平板端：字体层级与留白统一收束（置于末尾确保优先级） ========== */
@media (max-width: 1024px) {
    .service-info h3 {
        font-size: 30px;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 64px 0;
    }

    .section-sub {
        font-size: 16px;
    }

    .block-header {
        margin-bottom: 36px;
    }

    .block-header h3 {
        font-size: 26px;
    }

    .block-header p {
        font-size: 15px;
    }

    .about-block {
        margin-bottom: 64px;
    }

    .service-info h3 {
        font-size: 24px;
        text-wrap: balance;
    }

    .service-info p {
        font-size: 15px;
    }

    .page-hero {
        padding: 96px 0 56px;
    }

    .page-hero-title {
        font-size: 32px;
    }

    .page-hero-desc {
        font-size: 15px;
        line-height: 1.85;
        text-wrap: balance;
    }

    .detail-overview {
        padding: 64px 0;
    }

    .cta-banner {
        padding: 64px 0;
    }

    .cta-banner p {
        font-size: 15px;
    }

    .footer {
        padding: 56px 0 32px;
    }
}

/* ========== 横屏矮视口（横屏手机 / 矮窗口） ========== */
@media (max-height: 560px) {
    /* 导航栏压缩：横屏下减少占屏比例（约 78px -> 48px） */
    .header {
        padding: 6px 0;
    }

    .logo {
        gap: 8px;
    }

    .logo-mark {
        width: 36px;
        height: 36px;
    }

    .header .logo-cn {
        font-size: 17px;
    }

    .logo-en {
        font-size: 9px;
    }

    .menu-toggle {
        padding: 4px;
        gap: 4px;
    }

    .menu-toggle span {
        width: 20px;
        height: 2px;
    }

    section[id],
    .about-block[id] {
        scroll-margin-top: 60px;
    }

    /* hero 高度随压缩后的导航重新贴合一屏（48px ≈ 36px logo + 12px padding） */
    .hero {
        height: calc(100vh - 48px);
        min-height: 0;
    }

    .hero-content-overlay {
        bottom: 72px;
    }

    .hero-unmute-btn,
    .hero-fullscreen-btn {
        bottom: 20px;
    }

    .hero-title {
        margin-bottom: 14px;
    }

    .hero-desc {
        margin-bottom: 22px;
    }

    .hero-play-btn {
        width: 64px;
        height: 64px;
    }
}

/* ========== 导航汉堡触发断点下移到 819：平板竖屏(820+)显示完整导航 ========== */
@media (max-width: 819px) {
    .nav, .nav-cta {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }
}

/* ========== 时间轴：移动端/平板入场动画不可靠，直接立即可见 ========== */
.timeline-item.fade-up {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
}