html {
    scroll-behavior: smooth;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Inter', sans-serif;
    color: #333;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container-sm {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.25rem;
}

.max-w-site {
    max-width: 1100px;
}

/* Desktop header nav — prevent overlap with language switcher */
.header-desktop-nav {
    flex: 1 1 0%;
    min-width: 0;
}

html[lang="en"] .header-desktop-nav {
    font-size: 0.6875rem;
    letter-spacing: -0.01em;
}

html[lang="zh-CN"] .header-desktop-nav,
html[lang="zh"] .header-desktop-nav {
    font-size: 0.8125rem;
}

@media (min-width: 1280px) {
    html[lang="en"] .header-desktop-nav {
        font-size: 0.75rem;
    }

    html[lang="zh-CN"] .header-desktop-nav,
    html[lang="zh"] .header-desktop-nav {
        font-size: 0.875rem;
    }
}

@media (min-width: 768px) and (max-width: 1279px) {
    html[lang="en"] .header-desktop-nav .nav-link-label {
        position: absolute;
        width: 1px;
        height: 1px;
        padding: 0;
        margin: -1px;
        overflow: hidden;
        clip: rect(0, 0, 0, 0);
        white-space: nowrap;
        border: 0;
    }

    html[lang="en"] .header-desktop-nav .header-nav-link {
        padding-left: 0.5rem;
        padding-right: 0.5rem;
    }
}

html[lang="en"] .header-desktop-nav .header-nav-link {
    padding-left: 0.375rem;
    padding-right: 0.375rem;
}

@media (min-width: 1280px) {
    html[lang="en"] .header-desktop-nav .header-nav-link {
        padding-left: 0.5rem;
        padding-right: 0.5rem;
    }
}

/* Global Transitions */
a, button, .transition-all {
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1) !important;
}

.hero-gradient {
    background: linear-gradient(135deg, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0.4) 100%);
}

[data-i18n] {
    transition: opacity 0.3s ease-in-out;
}

.lang-active {
    color: #EC4636 !important;
    background-color: white;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

/* Language Switcher Animation */
#lang-zh, #lang-en {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

#lang-zh:hover, #lang-en:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(236, 70, 54, 0.2);
}

/* Custom AOS Refinements */
[data-aos] {
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1) !important;
}

/* Hover Effects */
.hover-lift {
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.hover-lift:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
}

/* Mobile Menu Animation */
#mobile-menu {
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateX(100%);
}
#mobile-menu.active {
    transform: translateX(0);
}

#mobile-menu-overlay {
    transition: opacity 0.5s ease;
}

/* Floating Animation for Images */
.image-container {
    position: relative;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.floating-animation {
    animation: float 6s ease-in-out infinite;
}

.floating-animation-delayed {
    animation: float 6s ease-in-out infinite 1.5s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* Hover Effects for Animated Images */
.image-container:hover {
    transform: scale(1.05);
}

.image-container:hover .floating-animation,
.image-container:hover .floating-animation-delayed {
    animation-play-state: paused;
}

/* Mobile Responsive Adjustments */
@media (max-width: 768px) {
    .floating-animation,
    .floating-animation-delayed {
        animation: float-mobile 4s ease-in-out infinite;
    }
    
    .floating-animation-delayed {
        animation-delay: 1s;
    }
    
    @keyframes float-mobile {
        0%, 100% {
            transform: translateY(0px);
        }
        50% {
            transform: translateY(-10px);
        }
    }
    
    .image-container:hover {
        transform: scale(1.02);
    }
}

/* Homepage Robot Intro Animation */
.home-robot-intro {
    position: fixed;
    left: 50%;
    top: 50%;
    width: min(200px, 30vw);
    z-index: 9997;
    pointer-events: auto;
    cursor: pointer;
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.65);
    transition:
        opacity 0.8s ease,
        transform 1s cubic-bezier(0.2, 0.8, 0.2, 1),
        left 1.8s cubic-bezier(0.22, 1, 0.36, 1),
        top 1.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.home-robot-intro .home-robot-image {
    width: 100%;
    height: auto;
    display: block;
    filter: drop-shadow(0 16px 24px rgba(0, 0, 0, 0.24));
    transform-origin: center bottom;
}

.home-robot-intro .home-robot-image.is-bouncing {
    animation: robotImageDampedBounce 1.8s cubic-bezier(0.23, 1, 0.32, 1);
}

.home-robot-intro .home-robot-image.is-bouncing-strong {
    animation: robotImageDampedBounceStrong 2.1s cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes robotImageDampedBounce {
    0% { transform: translateY(0); }
    12% { transform: translateY(-22px); }
    24% { transform: translateY(0); }
    36% { transform: translateY(-14px); }
    48% { transform: translateY(0); }
    60% { transform: translateY(-9px); }
    72% { transform: translateY(0); }
    84% { transform: translateY(-5px); }
    100% { transform: translateY(0); }
}

@keyframes robotImageDampedBounceStrong {
    0% { transform: translateY(0); }
    10% { transform: translateY(-36px); }
    20% { transform: translateY(0); }
    32% { transform: translateY(-24px); }
    44% { transform: translateY(0); }
    56% { transform: translateY(-16px); }
    68% { transform: translateY(0); }
    80% { transform: translateY(-10px); }
    90% { transform: translateY(0); }
    100% { transform: translateY(0); }
}

.home-robot-bubble {
    position: absolute;
    left: -150px;
    top: -34px;
    max-width: 240px;
    padding: 12px 18px;
    border-radius: 999px;
    background: rgba(38, 0, 0, 0.84);
    border: 1px solid rgba(255, 108, 108, 0.5);
    color: #ff8f8f;
    font-size: 18px;
    font-weight: 700;
    line-height: 1.35;
    box-shadow: 0 0 14px rgba(255, 92, 92, 0.35), 0 6px 20px rgba(0, 0, 0, 0.24);
    text-shadow:
        0 0 8px rgba(255, 120, 120, 0.95),
        0 0 16px rgba(255, 105, 105, 0.75),
        0 0 24px rgba(255, 80, 80, 0.5);
    animation: bubbleGlow 2.2s ease-in-out infinite;
    opacity: 1;
    transition: opacity 0.9s ease, transform 0.9s ease;
}

.home-robot-bubble::after {
    content: '';
    position: absolute;
    right: 24px;
    bottom: -12px;
    width: 0;
    height: 0;
    border-left: 11px solid transparent;
    border-right: 11px solid transparent;
    border-top: 16px solid rgba(38, 0, 0, 0.92);
    filter: drop-shadow(0 0 4px rgba(255, 90, 90, 0.45));
}

@keyframes bubbleGlow {
    0%, 100% {
        text-shadow:
            0 0 8px rgba(255, 120, 120, 0.95),
            0 0 16px rgba(255, 105, 105, 0.75),
            0 0 24px rgba(255, 80, 80, 0.5);
    }
    50% {
        text-shadow:
            0 0 10px rgba(255, 160, 160, 1),
            0 0 20px rgba(255, 120, 120, 0.85),
            0 0 30px rgba(255, 90, 90, 0.68);
    }
}

.home-robot-intro.is-landing .home-robot-bubble {
    color: #ff6b6b;
    opacity: 0;
    transform: translateY(8px) scale(0.92);
    pointer-events: none;
    animation: none;
    text-shadow:
        0 0 12px rgba(255, 120, 120, 1),
        0 0 22px rgba(255, 90, 90, 0.92),
        0 0 36px rgba(255, 70, 70, 0.78);
}

.home-robot-intro.is-bubble-exit .home-robot-bubble {
    opacity: 0;
    transform: translateY(10px) scale(0.9);
    pointer-events: none;
    animation: none;
}

.home-robot-intro.is-visible {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

.home-robot-intro.is-landing {
    left: calc(100% - 74px);
    top: calc(100% - 86px);
    transform: translate(-50%, -50%) scale(0.45);
    animation: robotLandingBounce 0.7s ease-out;
}

@keyframes robotLandingBounce {
    0% {
        transform: translate(-50%, -70%) scale(0.6);
    }
    60% {
        transform: translate(-50%, -45%) scale(0.54);
    }
    100% {
        transform: translate(-50%, -50%) scale(0.55);
    }
}

@media (max-width: 768px) {
    .home-robot-intro {
        width: min(148px, 32vw);
        top: 50%;
    }

    .home-robot-intro.is-landing {
        left: calc(100% - 56px);
        top: calc(100% - 68px);
        transform: translate(-50%, -50%) scale(0.42);
    }

    .home-robot-bubble {
        left: -104px;
        top: -26px;
        max-width: 170px;
        padding: 9px 12px;
        border-radius: 999px;
        font-size: 13px;
    }

    .home-robot-bubble::after {
        right: 18px;
        bottom: -10px;
        border-left-width: 8px;
        border-right-width: 8px;
        border-top-width: 12px;
    }
}