/* ===== 基础配置 ===== */
:root {
    --navy: #0A1F44;
    --sky-500: #1E90FF;
    --sky-400: #00BFFF;
    --font-heading: 'Poppins', 'Noto Sans SC', sans-serif;
    --font-body: 'Inter', 'Noto Sans SC', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.font-heading {
    font-family: var(--font-heading);
}

/* ===== 文字渐变 ===== */
.text-gradient {
    background: linear-gradient(135deg, var(--sky-500), var(--sky-400));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== 导航栏 ===== */
#navbar {
    background: transparent;
}

#navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(10, 31, 68, 0.08);
}

.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(135deg, var(--sky-500), var(--sky-400));
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

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

/* ===== 动画 ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes pulse-slow {
    0%, 100% { opacity: 0.4; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.05); }
}

@keyframes spin-slow {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes spin-reverse-slow {
    from { transform: rotate(360deg); }
    to { transform: rotate(0deg); }
}

@keyframes orbit-node-1 {
    0% { transform: rotate(0deg) translateX(160px) rotate(0deg); }
    100% { transform: rotate(360deg) translateX(160px) rotate(-360deg); }
}

@keyframes orbit-node-2 {
    0% { transform: rotate(0deg) translateX(120px) rotate(0deg); }
    100% { transform: rotate(360deg) translateX(120px) rotate(-360deg); }
}

@keyframes orbit-node-3 {
    0% { transform: rotate(0deg) translateX(80px) rotate(0deg); }
    100% { transform: rotate(360deg) translateX(80px) rotate(-360deg); }
}

.animate-fade-in-up {
    animation: fadeInUp 0.8s ease-out forwards;
}

.animate-fade-in {
    animation: fadeIn 1s ease-out 0.3s forwards;
    opacity: 0;
}

.animate-pulse-slow {
    animation: pulse-slow 4s ease-in-out infinite;
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== SVG 轨道动画 ===== */
.orbit-1 {
    animation: spin-slow 30s linear infinite;
    transform-origin: 200px 200px;
}

.orbit-2 {
    animation: spin-reverse-slow 20s linear infinite;
    transform-origin: 200px 200px;
}

.orbit-3 {
    animation: spin-slow 15s linear infinite;
    transform-origin: 200px 200px;
}

.pulse-dot {
    animation: pulse-slow 2s ease-in-out infinite;
    transform-origin: 200px 200px;
}

.node-1 {
    animation: orbit-node-1 25s linear infinite;
    transform-origin: 200px 200px;
}

.node-2 {
    animation: orbit-node-2 18s linear infinite;
    transform-origin: 200px 200px;
}

.node-3 {
    animation: orbit-node-3 12s linear infinite;
    transform-origin: 200px 200px;
}

.node-4 {
    animation: orbit-node-2 15s linear reverse infinite;
    transform-origin: 200px 200px;
}

.connect-line {
    animation: pulse-slow 3s ease-in-out infinite;
}

/* ===== 服务卡片 ===== */
.service-card {
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--sky-500), var(--sky-400));
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(10, 31, 68, 0.1);
    border-color: var(--sky-500);
}

.service-card:hover::before {
    transform: scaleX(1);
}

/* ===== 优势卡片 ===== */
.advantage-card {
    transition: all 0.3s ease;
}

.advantage-card:hover {
    transform: translateY(-4px);
}

.advantage-card:hover .w-14 {
    transform: scale(1.1) rotate(5deg);
}

.advantage-card .w-14 {
    transition: all 0.3s ease;
}

/* ===== 数字动画 ===== */
.counter {
    display: inline-block;
}

/* ===== 联系表单 ===== */
#contactForm input:focus,
#contactForm textarea:focus {
    border-color: var(--sky-500);
    box-shadow: 0 0 0 3px rgba(30, 144, 255, 0.1);
}

#contactForm input,
#contactForm textarea {
    transition: all 0.3s ease;
}

/* ===== 返回顶部按钮 ===== */
#backToTop.show {
    opacity: 1;
    visibility: visible;
}

/* ===== 语言切换按钮 ===== */
.lang-toggle {
    min-width: 60px;
}

/* ===== 移动端菜单 ===== */
#mobileMenu {
    transform-origin: top;
    transition: all 0.3s ease;
}

#mobileMenu.open {
    display: block;
}

#mobileMenuBtn.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

#mobileMenuBtn.active span:nth-child(2) {
    opacity: 0;
}

#mobileMenuBtn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
    width: 1.5rem;
}

/* ===== Hero 粒子 Canvas ===== */
#heroCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

/* ===== Hero 渐变光晕层 ===== */
.hero-gradient-overlay {
    position: absolute;
    inset: 0;
    z-index: 2;
    pointer-events: none;
    background: 
        radial-gradient(ellipse at 0% 0%, rgba(10, 31, 68, 0.05) 0%, transparent 50%),
        radial-gradient(ellipse at 100% 100%, rgba(30, 144, 255, 0.08) 0%, transparent 50%);
}

/* ===== 浮动光球 ===== */
.hero-orb {
    position: absolute;
    border-radius: 50%;
    z-index: 3;
    pointer-events: none;
    will-change: transform;
}

@keyframes orbFloat1 {
    0%, 100% { transform: translateY(0) translateX(0); }
    50% { transform: translateY(-20px) translateX(5px); }
}

@keyframes orbFloat2 {
    0%, 100% { transform: translateY(0) translateX(0); }
    50% { transform: translateY(-15px) translateX(-8px); }
}

@keyframes orbFloat3 {
    0%, 100% { transform: translateY(0) translateX(0); }
    50% { transform: translateY(-25px) translateX(3px); }
}

/* ===== 打字机效果 ===== */
.typewriter-text {
    color: var(--sky-500);
    font-family: var(--font-heading);
    font-size: 1.125rem;
    min-height: 1.75rem;
}

.typewriter-cursor {
    display: inline-block;
    width: 2px;
    height: 1.2em;
    background: var(--sky-500);
    margin-left: 2px;
    vertical-align: text-bottom;
    animation: cursorBlink 0.8s ease-in-out infinite;
}

@keyframes cursorBlink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* ===== 入场动画 - 依次触发 ===== */
.hero-stagger {
    opacity: 0;
    transform: translateY(30px);
}

.hero-stagger.animate-in {
    animation: heroFadeInUp 0.7s ease-out forwards;
}

@keyframes heroFadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== CTA 按钮涟漪效果 ===== */
.btn-primary-ripple {
    position: relative;
    overflow: hidden;
}

.btn-primary-ripple::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(30, 144, 255, 0.4) 0%, transparent 70%);
    transform: translate(-50%, -50%) scale(0);
    opacity: 0;
    border-radius: inherit;
    transition: transform 0.6s ease-out, opacity 0.6s ease-out;
    pointer-events: none;
}

.btn-primary-ripple:hover::after {
    transform: translate(-50%, -50%) scale(1.5);
    opacity: 0;
}

.btn-secondary-fill {
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.btn-secondary-fill::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background: var(--navy);
    transition: width 0.3s ease;
    z-index: -1;
    border-radius: inherit;
}

.btn-secondary-fill:hover {
    color: white;
    border-color: var(--navy);
}

.btn-secondary-fill:hover::before {
    width: 100%;
}

/* ===== 浮动功能卡片 ===== */
.float-card {
    position: absolute;
    background: white;
    border: 1px solid rgba(30, 144, 255, 0.2);
    border-radius: 12px;
    padding: 8px 12px;
    box-shadow: 0 4px 16px rgba(10, 31, 68, 0.08);
    opacity: 0;
    transform: translateY(15px);
    will-change: transform;
    z-index: 10;
    white-space: nowrap;
    font-size: 0.8rem;
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.float-card.show {
    opacity: 1;
    transform: translateY(0);
}

@keyframes cardFloat1 {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

@keyframes cardFloat2 {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes cardFloat3 {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

@keyframes cardFloat4 {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

/* ===== 滚动指示器 ===== */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    opacity: 0.5;
    transition: opacity 0.3s ease;
    cursor: pointer;
}

.scroll-indicator:hover {
    opacity: 1;
}

@keyframes scrollBounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* ===== Hero SVG 轨道动画 ===== */
.hex-spin {
    animation: hexSpin 20s linear infinite;
    transform-origin: center;
}

@keyframes hexSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes pulseExpand {
    0% { r: 8; opacity: 1; }
    100% { r: 20; opacity: 0; }
}

.pulse-ring {
    animation: pulseExpand 3s ease-out infinite;
    transform-origin: center;
}

.data-flow-dot {
    will-change: transform;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .hero-content {
        text-align: center;
    }
    
    .cta-btn {
        justify-content: center;
    }
    
    #hero {
        min-height: auto;
        padding-top: 100px;
        padding-bottom: 60px;
    }
    
    .hero-svg-container {
        display: none !important;
    }
    
    .float-card {
        display: none !important;
    }
}

@media (min-width: 768px) and (max-width: 1024px) {
    .hero-svg-container svg {
        width: 320px !important;
        height: 320px !important;
    }
    
    .float-card {
        display: none !important;
    }
}

/* ===== 平滑滚动偏移 ===== */
section[id] {
    scroll-margin-top: 80px;
}

/* ===== 选择文字样式 ===== */
::selection {
    background: rgba(30, 144, 255, 0.2);
    color: var(--navy);
}
/* ===== AI 模型卡片展示 ===== */
.model-filter-bar {
    scrollbar-width: none;
    -ms-overflow-style: none;
}
.model-filter-bar::-webkit-scrollbar {
    display: none;
}

.model-filter-btn {
    background: #fff;
    color: #6B7280;
    border: 1.5px solid #D1D5DB;
    transition: all 0.25s ease;
}
.model-filter-btn:hover {
    border-color: #1E90FF;
    color: #1E90FF;
}
.model-filter-btn.active {
    background: var(--navy);
    color: #fff;
    border-color: var(--navy);
}

.model-card {
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 2px 12px rgba(10, 31, 68, 0.06);
    border: 1px solid rgba(10, 31, 68, 0.06);
    border-left: 4px solid transparent;
    transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
    overflow: hidden;
}
.model-card:hover {
    transform: translateY(-4px);
    border-left-color: var(--sky-500);
    box-shadow: 0 12px 32px rgba(10, 31, 68, 0.1);
}

.model-logo-circle {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.model-desc-zh { display: none; }
.model-desc-en { display: block; }
html[lang="zh"] .model-desc-zh { display: block; }
html[lang="zh"] .model-desc-en { display: none; }

.model-status-available {
    color: #16A34A;
    background: #F0FDF4;
    border: 1px solid #BBF7D0;
}
.model-status-coming {
    color: #6B7280;
    background: #F3F4F6;
    border: 1px solid #D1D5DB;
}

.model-learn-more-btn {
    color: var(--sky-500);
    font-weight: 500;
    font-size: 0.875rem;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.model-learn-more-btn:hover {
    color: var(--navy);
}
.model-learn-more-btn svg {
    transition: transform 0.2s ease;
}
.model-learn-more-btn:hover svg {
    transform: translateX(3px);
}

#noResults {
    animation: fadeInUp 0.5s ease-out;
}

.model-card-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.model-card-animate.visible {
    opacity: 1;
    transform: translateY(0);
}