/* ========== 基础变量 ========== */
:root {
    --blue-50:  #EFF6FF;
    --blue-200: #BFDBFE;
    --blue-300: #93C5FD;
    --blue-400: #60A5FA;
    --blue-500: #3B82F6;
    --blue-600: #2563EB;
    --blue-700: #1D4ED8;
    --ink-900:  #0F172A;
    --ink-700:  #334155;
    --ink-500:  #64748B;
    --ink-300:  #CBD5E1;
    --bg:       #F5F8FD;
    --radius:   14px;
    --radius-lg:20px;
    --shadow:   0 6px 20px rgba(37, 99, 235, 0.08);
    --shadow-lg:0 12px 32px rgba(37, 99, 235, 0.12);
    --container: 1180px;
    --focus-ring: 0 0 0 3px rgba(59, 130, 246, .35);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
button, a, [role="button"], video, input, textarea, select, label {
    -webkit-tap-highlight-color: transparent;
}
video { -webkit-tap-highlight-color: transparent; outline: none; }
video::-webkit-media-controls-enclosure { -webkit-tap-highlight-color: transparent; }
button:focus { outline: none; }
input:focus, textarea:focus, select:focus { outline: none; box-shadow: none; }
html { scroll-padding-top: 80px; }
body {
    font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont,
                 "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--ink-900);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
a:visited { color: inherit; }
ul, ol { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4 { margin: 0; line-height: 1.3; }

:focus { outline: none; }
:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
    border-radius: 8px;
}
/* 输入类元素不需要全局聚焦光环 */
input:focus,
input:focus-visible,
textarea:focus,
textarea:focus-visible,
select:focus,
select:focus-visible {
    outline: none;
    box-shadow: none;
}

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

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background-color .2s ease, border-color .2s ease, color .2s ease, transform .2s ease, box-shadow .2s ease;
    white-space: nowrap;
}
.btn-lg { padding: 13px 26px; font-size: 15px; }
.btn-primary,
.btn-primary:visited {
    background: var(--blue-600);
    color: #fff;
    box-shadow: 0 6px 16px rgba(37, 99, 235, .3);
}
.btn-primary:hover { background: var(--blue-700); color: #fff; transform: translateY(-1px); }
.btn-soft,
.btn-soft:visited {
    background: #fff;
    color: var(--blue-700);
    border-color: var(--blue-200);
}
.btn-soft:hover { background: var(--blue-50); border-color: var(--blue-400); color: var(--blue-700); }
.btn-ghost,
.btn-ghost:visited {
    background: #fff;
    color: var(--ink-700);
    border-color: var(--ink-300);
}
.btn-ghost:hover { border-color: var(--blue-400); color: var(--blue-600); }
.btn-ghost-light,
.btn-ghost-light:visited {
    background: transparent;
    color: #fff;
    border-color: rgba(255,255,255,.5);
}
.btn-ghost-light:hover { background: rgba(255,255,255,.12); border-color: #fff; color: #fff; }

/* ========== 顶部导航 ========== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.92);
    backdrop-filter: saturate(180%) blur(10px);
    border-bottom: 1px solid #E7EEF9;
}
.nav-wrap {
    display: flex;
    align-items: center;
    gap: 24px;
    height: 96px;
}
.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 22px;
    color: var(--ink-900);
    letter-spacing: 0.5px;
    flex-shrink: 0;
}
.logo-img {
    width: 210px;
    height: auto;
    display: block;
}
.logo-img-dark {
    width: auto;
    height: 32px;
    filter: brightness(1.15);
}
.logo-text { line-height: 1; }
.main-nav { flex: 1; }
.main-nav ul {
    display: flex;
    gap: 6px;
    justify-content: center;
}
.main-nav a {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 8px 14px;
    color: #0F172A;
    font-size: 15px;
    font-weight: 700;
    border-radius: 8px;
    white-space: nowrap;
    transition: color .15s ease, background-color .15s ease;
}
.main-nav a:visited { color: #0F172A; }
.main-nav a:hover,
.has-menu:hover > a { color: var(--blue-600); background: var(--blue-50); }
.main-nav a.active { color: var(--blue-600); background: var(--blue-50); }
.caret {
    display: inline-flex;
    align-items: center;
    color: var(--ink-500);
    transition: transform .2s;
}

/* ---- 下拉菜单 ---- */
.has-menu { position: relative; }
/* 桥接间隙:防止鼠标移向下拉菜单时经过 gap 导致 hover 丢失 */
.has-menu::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    height: 10px;
    background: transparent;
}
.submenu {
    position: absolute;
    top: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%) translateY(6px);
    min-width: 260px;
    background: #fff;
    border: 1px solid #E7EEF9;
    border-radius: 12px;
    box-shadow: 0 16px 40px rgba(15, 23, 42, .12);
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .18s ease, transform .18s ease, visibility .18s;
    z-index: 60;
}
.has-menu:hover > .submenu,
.has-menu.open > .submenu {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}
.has-menu:hover > a .caret,
.has-menu.open > a .caret { transform: rotate(180deg); }

.submenu a {
    display: flex !important;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 12px !important;
    border-radius: 8px;
    color: var(--ink-700) !important;
    background: transparent !important;
}
.submenu a:hover {
    background: var(--blue-50) !important;
    color: var(--blue-700) !important;
}
.sm-ico {
    width: 30px; height: 30px;
    flex-shrink: 0;
    background: var(--blue-50);
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--blue-600);
}
.submenu a span:last-child {
    display: flex;
    flex-direction: column;
    gap: 2px;
    line-height: 1.35;
}
.submenu b { font-size: 14px; font-weight: 600; }
.submenu em {
    font-style: normal;
    font-size: 12px;
    color: var(--ink-500);
}

.nav-cta { display: flex; gap: 10px; flex-shrink: 0; }

.main-nav-mobile-cta { display: none; }

.nav-toggle {
    display: none;
    width: 40px; height: 40px;
    background: transparent;
    border: 1px solid var(--ink-300);
    border-radius: 8px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    margin-left: auto;
}
.nav-toggle span {
    display: block;
    width: 18px; height: 2px;
    background: var(--ink-700);
    transition: transform .2s;
}
.nav-toggle.is-active span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.is-active span:nth-child(2) { opacity: 0; }
.nav-toggle.is-active span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ========== Hero ========== */
.hero {
    background: linear-gradient(180deg, #EEF4FF 0%, #F5F8FD 100%);
    padding: 48px 0 22px;
    position: relative;
    overflow: hidden;
}
.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}
.hero-copy h1 {
    font-size: 46px;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 22px;
}
.hero-copy h1 .hl { color: var(--blue-600); }
.lead {
    font-size: 16px;
    color: var(--ink-500);
    margin: 0 0 22px;
}
.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 28px;
    padding: 0;
}
.tag-list li {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 10px 7px 0;
    background: transparent;
    border: none;
    font-size: 14px;
    color: var(--ink-700);
}
.tag-ico {
    width: 18px;
    height: 18px;
    object-fit: contain;
    display: block;
}
.hero-btns { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 26px; }
.hero-foot { color: var(--ink-500); font-size: 13px; margin: 12px 0 0; }

.hero-art {
    display: flex;
    justify-content: center;
    align-items: center;
}
.hero-img { width: 100%; max-width: 560px; height: auto; }

/* ========== 通用 section ========== */
.section { padding: 26px 0; }
.section-title {
    text-align: center;
    font-size: 30px;
    font-weight: 700;
    margin-bottom: 40px;
}

/* ========== 步骤 ========== */
.steps { background: #fff; }
.step-list {
    display: grid;
    /* 5 张卡(1fr)+ 4 个箭头(auto) */
    grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr auto 1fr;
    gap: 10px;
    align-items: stretch;
}
.step-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 18px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 10px;
    transition: transform .25s ease, box-shadow .25s ease;
}
.step-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}
.step-num {
    font-size: 18px;
    font-weight: 800;
    color: var(--blue-600);
    line-height: 1;
    margin-top: -4px;
    align-self: flex-start;
}
.step-icon {
    width: 44px; height: 44px;
    border-radius: 10px;
    background: var(--blue-50);
    color: var(--blue-600);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}
.step-icon img {
    width: 28px;
    height: 28px;
    object-fit: contain;
}
.step-card h3 { font-size: 16px; font-weight: 700; }
.step-card p { margin: 0; color: var(--ink-500); font-size: 13px; }
.step-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--blue-600);
    font-size: 24px;
    letter-spacing: 2px;
}

/* ========== EVA ========== */
.eva { background: #fff; }
.eva-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: stretch;
}
.eva-intro {
    background: linear-gradient(135deg, #E0ECFE 0%, #F2F7FF 100%);
    border-radius: var(--radius-lg);
    padding: 30px 36px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.eva-title { font-size: 26px; font-weight: 800; color: var(--blue-700); }
.eva-sub { font-size: 13px; color: var(--blue-600); margin-left: 10px; font-weight: 500; background: #fff; border: 1px solid var(--blue-200); border-radius: 999px; padding: 4px 14px; display: inline-block; }
.eva-intro p { margin: 0; color: var(--ink-700); }
.eva-inner {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 6px 0 0;
    flex: 1;
}
.eva-inner-right {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-left: 24px;
}
.eva-robot-img { width: 200px; height: auto; margin-left: -10px; }

/* 放大按钮 */
.eva-robot { position: relative; display: inline-block; }
.eva-play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 56px;
    height: 56px;
    border: 0;
    border-radius: 50%;
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 3;
    transition: transform .15s ease;
}
.eva-play-btn:hover { transform: translate(-50%, -50%) scale(1.1); }
.eva-zoom-btn {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 32px;
    height: 32px;
    border: 0;
    border-radius: 50%;
    background: rgba(0, 0, 0, .55);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transform: translateY(-2px);
    transition: opacity .2s ease, transform .2s ease, background .2s ease;
    z-index: 2;
}
.eva-robot:hover .eva-zoom-btn,
.eva-zoom-btn:focus-visible { opacity: 1; transform: translateY(0); }
.eva-zoom-btn:hover { background: rgba(0, 0, 0, .8); }

/* 放大遮罩 */
.video-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, .82);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    padding: 24px;
}
.video-modal[hidden] { display: none; }
.video-modal-video {
    max-width: min(1200px, 92vw);
    max-height: 88vh;
    width: auto;
    height: auto;
    background: #000;
    border-radius: 8px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, .5);
    outline: none;
}
.video-modal-close {
    position: absolute;
    top: calc(18px + env(safe-area-inset-top, 0px));
    right: calc(22px + env(safe-area-inset-right, 0px));
    width: 40px;
    height: 40px;
    border: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, .12);
    color: #fff;
    font-size: 26px;
    line-height: 1;
    cursor: pointer;
    transition: background .2s ease;
    z-index: 1;
}
.video-modal-close:hover { background: rgba(255, 255, 255, .22); }
/* 打开遮罩时,临时让 sticky header 退到下层,避免在移动端遮挡关闭按钮 */
body.modal-open .site-header { z-index: 1 !important; }
@media (max-width: 768px) {
    .video-modal { padding: 16px; }
    .video-modal-close {
        top: calc(12px + env(safe-area-inset-top, 0px));
        right: calc(12px + env(safe-area-inset-right, 0px));
        width: 44px;
        height: 44px;
        background: rgba(0, 0, 0, .65);
        border: 1px solid rgba(255, 255, 255, .35);
    }
    .video-modal-video { max-height: 80vh; }
}
.eva-features { display: flex; flex-direction: column; gap: 10px; }
.eva-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 15px;
    color: var(--ink-700);
}
.eva-feat-ico {
    width: 18px;
    height: 18px;
    object-fit: contain;
}
.eva-inner-right .btn { align-self: flex-start; }

.eva-chat {
    background: #fff;
    border: 1px solid #E5ECF7;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 420px;
}
.chat-brand {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 700;
    font-size: 15px;
    color: var(--ink-900);
    padding: 16px 18px;
    border-bottom: 1px solid #E5ECF7;
}
.chat-online {
    width: 7px;
    height: 7px;
    background: #10B981;
    border-radius: 50%;
    margin-left: 2px;
}
.chat-logo {
    width: 20px;
    height: 20px;
    object-fit: contain;
}
.chat-body {
    display: grid;
    grid-template-columns: 130px 1fr;
    flex: 1;
    min-height: 390px;
    position: relative;
}
.chat-side {
    background: #fff;
    padding: 14px 12px;
    border-right: 1px solid #E5ECF7;
    z-index: 1;
}
.chat-menu li {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 10px;
    border-radius: 8px;
    font-size: 13px;
    color: var(--ink-500);
    margin-bottom: 2px;
    cursor: pointer;
    transition: background-color .15s ease, color .15s ease;
}
.menu-ico {
    width: 16px;
    height: 16px;
    object-fit: contain;
    flex-shrink: 0;
}
.menu-ico-active { display: none; }
.menu-ico-default { display: block; }
.chat-menu li.active .menu-ico-active { display: block; }
.chat-menu li.active .menu-ico-default { display: none; }
.chat-menu li.active { background: var(--blue-50); color: var(--blue-700); font-weight: 600; }
.chat-menu li:hover { background: #F4F8FF; }
.chat-main {
    padding: 0;
    display: block;
    position: relative;
    height: 390px;
}
.chat-tab {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    overflow-y: auto;
    transition: opacity .2s ease;
    scrollbar-width: none;
    -ms-overflow-style: none;
}
.chat-tab::-webkit-scrollbar { width: 0; height: 0; display: none; }
.chat-tab.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}
.chat-msg {
    max-width: 80%;
    padding: 10px 16px;
    border-radius: 12px;
    font-size: 14px;
}
.chat-msg.bot {
    background: #F0F6FF;
    color: var(--ink-700);
    align-self: flex-start;
}
.chat-msg.user {
    display: flex;
    align-items: center;
    gap: 8px;
    background: #fff;
    border: 1px solid #E5ECF7;
    color: var(--ink-700);
    align-self: flex-start;
    border-radius: 10px;
}
.play-ico {
    width: 12px;
    height: 12px;
    object-fit: contain;
    flex-shrink: 0;
}
.send-ico {
    width: 22px;
    height: 22px;
    object-fit: contain;
    display: block;
}
.chat-input {
    margin-top: auto;
    position: sticky;
    bottom: 0;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    background: #fff;
    border: 1px solid #E5ECF7;
    border-radius: 12px;
}
.chat-input input {
    flex: 1;
    background: transparent;
    border: 0 !important;
    outline: 0 !important;
    -webkit-appearance: none;
    appearance: none;
    box-shadow: none !important;
    font-size: 15px;
    line-height: 22px;
    height: 28px;
    color: var(--ink-700);
    caret-color: var(--blue-600);
    padding: 0;
}
.chat-input input:focus,
.chat-input input:focus-visible,
.chat-input input:active {
    outline: 0 !important;
    box-shadow: none !important;
    border: 0 !important;
    -webkit-appearance: none;
    appearance: none;
}
.chat-input button {
    width: 34px; height: 34px;
    border: none;
    background: transparent;
    border-radius: 8px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* ========== 三栏 features ========== */
.features { background: #fff; }
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.feature-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 14px;
    transition: transform .25s ease, box-shadow .25s ease;
}
.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.feature-card h3 { font-size: 18px; font-weight: 700; }
.feature-card p { margin: 0; color: var(--ink-500); font-size: 14px; }
.feature-card .btn { align-self: center; margin-top: auto; }
.feature-map { background: transparent; border-radius: 12px; padding: 0; }
.channel-list { display: flex; flex-direction: column; gap: 10px; width: 100%; }
.channel-list li {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 16px;
    background: #EBF3FF;
    border-radius: 10px;
    font-size: 14px;
    color: var(--ink-700);
    min-height: 56px;
}
.ch-ico {
    width: 22px; height: 22px;
    background: transparent;
    border-radius: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--blue-600);
    box-shadow: none;
    flex-shrink: 0;
}
.ch-ico img { width: 22px; height: 22px; object-fit: contain; }
.feature-map img { width: 100%; height: auto; display: block; border-radius: 8px; }
.pack-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    text-align: center;
    margin-top: 55px;
    width: 100%;
}
.pack-list li {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 16px 6px;
    background: transparent;
    border-radius: 0;
    font-size: 13px;
    color: var(--ink-700);
    min-height: 92px;
}
.pack-ico img { width: 40px; height: 40px; object-fit: contain; display: block; }

/* ========== CTA ========== */
.cta-band {
    padding: 26px 0;
    background: #fff;
}
.cta-inner {
    background: linear-gradient(180deg, #EEF4FF 0%, #F5F8FD 100%);
    border-radius: var(--radius-lg);
    padding: 36px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    box-shadow: 0 18px 40px rgba(37,99,235,.1);
}
.cta-left {
    display: flex;
    align-items: center;
    gap: 20px;
    color: var(--ink-900);
}
.cta-left h2 { font-size: 30px; }
.cta-left p { margin: 6px 0 0; color: var(--ink-500); font-size: 16px; }
.cta-ico img { width: 56px; height: 56px; object-fit: contain; display: block; }
.cta-right { display: flex; gap: 12px; }

/* ========== Footer ========== */
.site-footer {
    background: #0E1833;
    color: #B6C1DA;
    padding: 54px 0 20px;
    font-size: 13px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr repeat(5, 1fr);
    gap: 30px;
    margin-bottom: 36px;
}
.logo-dark .logo-text { color: #fff; }
.logo-dark { color: #fff; margin-bottom: 14px; font-size: 24px; }
.foot-brand p { margin: 0 0 18px; line-height: 1.8; }

.socials {
    display: flex;
    gap: 10px;
}
.socials a {
    width: 34px; height: 34px;
    border-radius: 50%;
    background: #1B2746;
    color: #B6C1DA;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all .18s ease;
}
.socials a:hover {
    background: var(--blue-600);
    color: #fff;
    transform: translateY(-1px);
}
.foot-col h4 {
    color: #fff;
    font-size: 14px;
    margin-bottom: 14px;
    font-weight: 600;
}
.foot-col li { margin-bottom: 8px; }
.foot-col a { transition: color .15s ease; }
.foot-col a:hover { color: #fff; }
.foot-bottom {
    display: flex;
    align-items: center;
    gap: 40px;
    padding-top: 18px;
    border-top: 1px solid #1E2A4D;
    color: #8793AE;
    flex-wrap: wrap;
}
.foot-links {
    display: flex;
    align-items: center;
    gap: 14px;
}
.foot-sep {
    width: 1px;
    height: 12px;
    background: #3A466A;
}
.foot-lang {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    border: 1px solid #2A3657;
    border-radius: 8px;
    color: #B6C1DA;
    position: relative;
    transition: border-color .15s;
    margin-left: auto;
}
.foot-lang:hover { border-color: #4B5A85; }
.foot-lang-ico { color: #8793AE; }
.foot-lang-btn {
    background: transparent;
    border: none;
    color: #B6C1DA;
    font-size: 13px;
    padding: 0 2px;
    cursor: pointer;
    outline: none;
    display: inline-flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    font-family: inherit;
    min-width: 90px;
}
.foot-lang-caret { color: #8793AE; transition: transform .2s; }
.foot-lang.open .foot-lang-caret { transform: rotate(180deg); }
.foot-lang-menu {
    position: absolute;
    left: 0;
    right: 0;
    bottom: calc(100% + 6px);
    background: #141E3A;
    border: 1px solid #2A3657;
    border-radius: 8px;
    padding: 4px;
    list-style: none;
    margin: 0;
    display: none;
    box-shadow: 0 10px 30px rgba(0,0,0,.35);
    z-index: 10;
}
.foot-lang.open .foot-lang-menu { display: block; }
.foot-lang-menu li {
    padding: 8px 12px;
    font-size: 13px;
    color: #B6C1DA;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color .12s ease, color .12s ease;
}
.foot-lang-menu li:hover { background: #1E2A4D; color: #fff; }
.foot-lang-menu li.active { background: var(--blue-600); color: #fff; }

/* ========== 响应式 ========== */
@media (max-width: 1023px) {
    .main-nav {
        position: absolute;
        top: 68px; left: 0; right: 0;
        background: #fff;
        border-bottom: 1px solid #E7EEF9;
        display: none;
        padding: 10px 0;
        max-height: calc(100vh - 68px);
        overflow-y: auto;
        box-shadow: 0 16px 32px rgba(15, 23, 42, .08);
    }
    .main-nav.open { display: block; }
    .main-nav ul {
        flex-direction: column;
        gap: 2px;
        padding: 6px 12px;
    }
    .main-nav a {
        padding: 12px 14px;
        border-radius: 10px;
        font-size: 15px;
    }
    .nav-toggle { display: flex; }
    .nav-cta { display: none; }

    .main-nav-mobile-cta {
        display: flex;
        gap: 10px;
        padding: 14px 16px 18px;
        margin-top: 8px;
        border-top: 1px solid #E7EEF9;
    }
    .main-nav-mobile-cta .btn {
        flex: 1;
        justify-content: center;
        padding: 10px 16px;
        font-size: 14px;
        border-radius: 10px;
        box-shadow: none;
    }
    .main-nav-mobile-cta .btn-primary,
    .main-nav-mobile-cta .btn-primary:visited {
        background: var(--blue-600);
        color: #fff;
        box-shadow: 0 4px 12px rgba(37, 99, 235, .25);
    }
    .main-nav-mobile-cta .btn-primary:hover { background: var(--blue-700); color: #fff; }
    .main-nav-mobile-cta .btn-ghost,
    .main-nav-mobile-cta .btn-ghost:visited {
        background: #fff;
        color: var(--ink-700);
        border-color: var(--ink-300);
    }
    .main-nav-mobile-cta .btn-ghost:hover { color: var(--blue-600); border-color: var(--blue-400); }

    /* 移动端下拉:改为内联展开 */
    .main-nav .has-menu > a {
        display: flex !important;
        align-items: center;
        justify-content: space-between;
    }
    .main-nav .has-menu > a .caret {
        margin-left: auto;
        color: var(--ink-500);
        transition: transform .25s ease;
    }
    .main-nav .has-menu.open > a {
        color: var(--blue-600);
        background: var(--blue-50);
    }
    .main-nav .has-menu.open > a .caret { transform: rotate(180deg); }

    .submenu,
    .has-menu:hover > .submenu,
    .has-menu.open > .submenu {
        position: static;
        left: auto;
        top: auto;
        transform: none;
        box-shadow: none;
        border: none;
        border-radius: 0;
        min-width: 0;
        width: 100%;
        max-width: 100%;
        background: transparent;
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        padding: 4px 0 10px;
        margin: 2px 0 6px;
        gap: 2px;
        z-index: auto;
    }
    .submenu { display: none; }
    .has-menu:hover > .submenu { display: none; }
    .has-menu.open > .submenu { display: flex; }

    .submenu a {
        display: flex !important;
        align-items: center;
        gap: 12px;
        padding: 10px 14px 10px 28px !important;
        margin: 0 4px;
        border-radius: 10px;
        white-space: normal;
        position: relative;
    }
    .submenu a::before {
        content: '';
        position: absolute;
        left: 16px;
        top: 50%;
        width: 4px;
        height: 4px;
        border-radius: 50%;
        background: var(--blue-300);
        transform: translateY(-50%);
        transition: background .15s;
    }
    .submenu a:hover::before,
    .submenu a:active::before { background: var(--blue-600); }

    .submenu .sm-ico { display: none; }
    .submenu a span:last-child {
        min-width: 0;
        flex: 1;
        display: flex;
        flex-direction: column;
        gap: 2px;
    }
    .submenu b {
        font-size: 14px;
        font-weight: 600;
        word-break: break-word;
    }
    .submenu em {
        font-size: 12px;
        color: var(--ink-500);
        word-break: break-word;
    }

    .hero-copy h1 { font-size: 36px; }
    .section { padding: 40px 0; }
    .section-title { font-size: 24px; margin-bottom: 28px; }

    .step-list {
        grid-template-columns: repeat(3, 1fr);
        gap: 14px;
    }
    .step-arrow { display: none; }

    .eva-grid { grid-template-columns: 1fr; }
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .feature-grid .feature-card:last-child { grid-column: 1 / -1; max-width: 640px; justify-self: center; width: 100%; }

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

@media (max-width: 767px) {
    .hero { padding: 40px 0 50px; }
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    .hero-art { order: -1; }
    .hero-copy h1 { font-size: 30px; }

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

    .feature-grid { grid-template-columns: 1fr; }
    .feature-grid .feature-card:last-child { grid-column: auto; max-width: none; justify-self: stretch; }

    .eva-intro { padding: 20px; }
    .eva-inner {
        flex-direction: column;
        align-items: center;
        gap: 16px;
        margin-left: 0;
    }
    .eva-robot {
        width: auto;
        display: inline-block;
        position: relative;
        margin: 0 auto;
    }
    .eva-robot-img {
        margin-left: 0;
        width: 200px;
        max-width: 80vw;
        height: auto;
        border-radius: 12px;
        flex-shrink: 0;
        background: #e8f0fe;
        display: block;
    }
    .eva-zoom-btn {
        opacity: 1;
        transform: translateY(0);
    }
    .eva-inner-right {
        margin-left: 0;
        align-items: center;
        gap: 10px;
        flex: 1;
        min-width: 0;
        width: 100%;
    }
    .eva-inner-right .btn { align-self: center; padding: 8px 14px; font-size: 13px; }
    .eva-features { gap: 8px; align-items: center; }
    .eva-features li { justify-content: flex-start; font-size: 13px; gap: 6px; }
    .eva-title { font-size: 22px; }
    .eva-sub {
        margin-left: 0;
        display: inline-block;
        padding: 3px 10px;
        font-size: 12px;
    }

    .chat-body { grid-template-columns: 1fr; min-height: auto; }
    .chat-side { border-right: none; border-bottom: 1px solid #E5ECF7; padding: 10px 8px; }
    .chat-menu {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 4px;
    }
    .chat-menu li {
        margin: 0;
        padding: 8px 6px;
        justify-content: center;
        font-size: 12px;
        gap: 4px;
    }
    .chat-main { height: 360px; }

    .pack-list { grid-template-columns: repeat(2, 1fr); margin-top: 20px; }

    .cta-inner {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
        padding: 28px 22px;
        gap: 20px;
    }
    .cta-left { flex-direction: column; align-items: center; }
    .cta-left h2 { font-size: 22px; }
    .cta-right { justify-content: center; flex-wrap: wrap; }

    .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
    .foot-brand { grid-column: 1 / -1; }
    .foot-bottom { flex-direction: column; align-items: flex-start; gap: 14px; }
    .foot-lang { margin-left: 0; }
}