/* ============================================
   设计系统 — 深空轨道风格 · 全本地无视频
   世界衛星互聯網有限公司 | Global Satellite Internet (6G)
   ============================================ */
:root {
    --bg: #05070a;
    --bg2: #080c14;
    --fg: #eef0f4;
    --fg-2: #b9c4dd;
    --muted: #7a8299;
    --accent: #4a7cff;
    --accent2: #00d4ff;
    --accent3: #ff6b35;
    --accent-soft: #6e9cff;
    --accent-dim: rgba(74, 124, 255, 0.15);
    --accent-glow: rgba(74, 124, 255, 0.25);
    --border: rgba(255,255,255,0.06);
    --border-hot: rgba(74, 124, 255, 0.32);
    --card-bg: rgba(10, 14, 26, 0.7);
    --card-border: rgba(74, 124, 255, 0.08);

    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, "Noto Sans SC", "Microsoft YaHei", sans-serif;
    --font-mono: "SF Mono", "Consolas", "Courier New", monospace;

    --nav-h: 64px;
    --max-w: 1200px;
}

/* 滚动进度条 */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent2), #a855f7);
    z-index: 200;
    width: 0%;
    transition: width 0.08s linear;
    box-shadow: 0 0 16px var(--accent-glow), 0 0 30px rgba(0, 212, 255, 0.3);
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    border: none;
    border-radius: 50%;
    color: #fff;
    cursor: pointer;
    z-index: 150;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.8);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 20px rgba(74, 124, 255, 0.4), 0 0 40px rgba(74, 124, 255, 0.15);
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}
.back-to-top:hover {
    transform: translateY(-4px) scale(1.1);
    box-shadow: 0 8px 30px rgba(74, 124, 255, 0.5), 0 0 50px rgba(0, 212, 255, 0.25);
}
.back-to-top svg {
    transition: transform 0.3s;
}
.back-to-top:hover svg {
    transform: translateY(-2px);
}

/* 增强浏览器滚动条 */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { 
    background: linear-gradient(180deg, var(--accent), var(--accent2)); 
    border-radius: 4px; 
    box-shadow: 0 0 10px rgba(74, 124, 255, 0.3);
}
::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #5a8cff, #00e5ff);
    box-shadow: 0 0 15px rgba(74, 124, 255, 0.5);
}

/* 星座卫星 Canvas */
#constellation-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

/* Section 视差遮罩层 */
.section-parallax-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

/* Hero 全屏视觉层 */
.hero-vignette {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 80% 50%, rgba(74, 124, 255, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 20% 20%, rgba(0, 212, 255, 0.05) 0%, transparent 40%),
        linear-gradient(180deg, transparent 0%, rgba(5, 7, 10, 0.3) 100%);
    pointer-events: none;
    z-index: 1;
}

/* 网格地板透视效果 */
.grid-floor {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) perspective(500px) rotateX(70deg);
    transform-origin: bottom center;
    width: 200%;
    height: 40%;
    background-image: 
        linear-gradient(rgba(74, 124, 255, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(74, 124, 255, 0.1) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: linear-gradient(to top, rgba(0,0,0,0.5) 0%, transparent 100%);
    -webkit-mask-image: linear-gradient(to top, rgba(0,0,0,0.5) 0%, transparent 100%);
    pointer-events: none;
    z-index: 1;
    opacity: 0;
    transition: opacity 1s ease;
}
.hero.scrolled .grid-floor {
    opacity: 0.6;
}

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

html {
    scroll-behavior: smooth;
    font-size: 18px;
    background: var(--bg);
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--fg);
    line-height: 1.8;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }

::selection { background: var(--accent); color: #fff; }
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: rgba(74,124,255,0.3); border-radius: 2px; }

/* ============================================
   全局 Canvas 星空背景
   ============================================ */
#starfield {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-h);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    background: rgba(5, 7, 10, 0.6);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.navbar.scrolled {
    background: rgba(5, 7, 10, 0.92);
    border-bottom-color: rgba(74, 124, 255, 0.2);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}
.navbar .logo-icon {
    background: rgba(74, 124, 255, 0.08);
    box-shadow: 0 0 20px rgba(74, 124, 255, 0.1);
}
.nav-links a {
    position: relative;
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    transition: width 0.3s;
}
.nav-links a:hover::after { width: 100%; }

.navbar .logo {
    display: flex;
    align-items: center;
    gap: 12px;
}
.navbar .logo-icon {
    width: 36px;
    height: 36px;
    border: 1px solid rgba(74,124,255,0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--accent);
}
.navbar .logo-text {
    display: flex;
    flex-direction: column;
}
.navbar .logo-text .cn {
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: var(--fg);
}
.navbar .logo-text .en {
    font-size: 8px;
    letter-spacing: 1.5px;
    color: var(--muted);
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
    list-style: none;
}
.nav-links a {
    font-size: 15px;
    font-weight: 500;
    color: var(--muted);
    letter-spacing: 2px;
    text-transform: uppercase;
    transition: color 0.3s;
    padding: 6px 0;
}
.nav-links a:hover { color: var(--fg); }

/* 语言切换按钮 */
.lang-toggle {
    background: rgba(74, 124, 255, 0.1);
    border: 1px solid rgba(74, 124, 255, 0.3);
    color: var(--fg);
    padding: 6px 14px;
    border-radius: 20px;
    font-family: var(--font);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 2px;
    margin-right: 12px;
}
.lang-toggle:hover {
    background: rgba(74, 124, 255, 0.2);
    border-color: rgba(74, 124, 255, 0.6);
}
.lang-toggle .lang-active {
    color: var(--accent);
    font-weight: 700;
}
.lang-toggle .lang-sep {
    color: var(--muted);
    margin: 0 2px;
}
.lang-toggle .lang-inactive {
    color: var(--muted);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}
.hamburger span {
    width: 20px;
    height: 1.5px;
    background: var(--fg);
    transition: all 0.3s;
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }

.mobile-menu {
    display: none;
    position: fixed;
    top: var(--nav-h);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--nav-h));
    background: rgba(5, 7, 10, 0.98);
    backdrop-filter: blur(20px);
    z-index: 99;
    flex-direction: column;
    padding: 40px 32px;
    gap: 16px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
    font-size: 20px;
    font-weight: 300;
    color: var(--muted);
    letter-spacing: 2px;
    text-transform: uppercase;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
    transition: color 0.3s;
}
.mobile-menu a:hover { color: var(--fg); }

/* ============================================
   Hero — 卫星交互首屏
   ============================================ */
.hero {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 100px 40px 80px;
    overflow: hidden;
}

/* 两列布局：左文字 / 右卫星 */
.hero-grid {
    max-width: var(--max-w);
    margin: 0 auto;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1.05fr;
    gap: 48px;
    align-items: center;
}

/* 装饰轨道环（在卫星背后） */
.hero-orbits {
    position: absolute;
    top: 50%;
    right: 8%;
    transform: translateY(-50%);
    width: 560px;
    height: 560px;
    pointer-events: none;
    opacity: 0.32;
    z-index: 0;
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}
.hero-orbit {
    position: absolute;
    top: 50%;
    left: 50%;
    border: 1px solid rgba(74, 124, 255, 0.08);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: orbitSpin linear infinite;
    transition: all 0.6s ease;
}
.hero-orbit::before {
    content: '';
    position: absolute;
    width: 5px;
    height: 5px;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 12px var(--accent-glow);
    top: -2.5px;
    left: 50%;
    transform: translateX(-50%);
    transition: all 0.3s;
}
.hero-orbit:nth-child(1) { width: 200px; height: 200px; animation-duration: 22s; border-color: rgba(74, 124, 255, 0.15); }
.hero-orbit:nth-child(2) { width: 360px; height: 360px; animation-duration: 38s; animation-direction: reverse; border-color: rgba(0, 212, 255, 0.1); }
.hero-orbit:nth-child(2)::before { background: var(--accent2); width: 7px; height: 7px; top: -3.5px; box-shadow: 0 0 16px rgba(0, 212, 255, 0.4); }
.hero-orbit:nth-child(3) { width: 540px; height: 540px; animation-duration: 60s; border-color: rgba(110,156,255,0.06); }
.hero-orbit:nth-child(3)::before { width: 4px; height: 4px; background: rgba(110,156,255,0.5); top: -2px; left: 30%; }
.hero-orbit:nth-child(4) { width: 680px; height: 680px; animation-duration: 90s; animation-direction: reverse; border-color: rgba(255, 107, 53, 0.04); opacity: 0; transition: opacity 1s; }
.hero-orbit:nth-child(4)::before { width: 3px; height: 3px; background: var(--accent3); top: -1.5px; left: 70%; box-shadow: 0 0 8px rgba(255, 107, 53, 0.3); }
.hero-orbit:nth-child(5) { width: 800px; height: 800px; animation-duration: 120s; border-color: rgba(74, 124, 255, 0.02); opacity: 0; transition: opacity 1.2s; }
.hero-orbit:nth-child(5)::before { width: 3px; height: 3px; background: rgba(255,255,255,0.3); top: -1.5px; left: 15%; box-shadow: none; }
/* 滚动时轨道平滑展开 */
.hero.scrolled .hero-orbits { opacity: 0.7; transform: translateY(-50%) scale(1.08); }
.hero.scrolled .hero-orbit:nth-child(4),
.hero.scrolled .hero-orbit:nth-child(5) { opacity: 0.5; }
.hero.scrolled-2 .hero-orbits { opacity: 0.3; transform: translateY(-50%) scale(1.15); }
.hero.scrolled-2 .hero-orbit:nth-child(4),
.hero.scrolled-2 .hero-orbit:nth-child(5) { opacity: 0.2; }

@keyframes orbitSpin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.hero-content {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}
/* 滚动时文字平滑视差上移淡出 */
.hero.scrolled .hero-content {
    opacity: 0.3;
    transform: translateY(-80px);
}
.hero.scrolled-2 .hero-content {
    opacity: 0;
    transform: translateY(-120px);
}
.hero h1 .accent {
    background: linear-gradient(135deg, var(--accent), var(--accent2), #6ea8ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: gradientShift 5s ease infinite;
}
@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    border: 1px solid var(--card-border);
    border-radius: 100px;
    font-size: 12px;
    letter-spacing: 2.5px;
    color: var(--accent);
    background: rgba(74,124,255,0.05);
    margin-bottom: 28px;
    opacity: 0;
    animation: fadeUp 0.8s ease 0.3s both;
}
.hero-badge .dot {
    width: 5px; height: 5px;
    border-radius: 50%;
    background: var(--accent);
    animation: blink 2s ease infinite;
}
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.2; }
}

.hero h1 {
    font-size: clamp(2rem, 4.8vw, 4.6rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -1.5px;
    margin-bottom: 20px;
    opacity: 0;
    animation: fadeUp 0.8s ease 0.5s both;
    text-align: left;
}
.hero h1 span {
    display: block;
    white-space: nowrap;
}
.hero h1 .accent {
    background: linear-gradient(135deg, var(--accent), #6ea8ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: clamp(1rem, 1.3vw, 1.15rem);
    color: var(--muted);
    font-weight: 300;
    line-height: 1.9;
    max-width: 540px;
    margin-bottom: 36px;
    opacity: 0;
    animation: fadeUp 0.8s ease 0.7s both;
    text-align: left;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
    opacity: 0;
    animation: fadeUp 0.8s ease 0.9s both;
}
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    font-family: var(--font);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 1px;
    cursor: pointer;
    border: none;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}
.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
    transition: left 0.6s;
}
.btn:hover::before { left: 100%; }
.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    color: #fff;
    box-shadow: 0 4px 20px rgba(74, 124, 255, 0.3);
}
.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(74,124,255,0.45);
}
.btn-outline {
    background: transparent;
    color: var(--fg);
    border: 1px solid rgba(255,255,255,0.1);
}
.btn-outline:hover {
    border-color: var(--accent);
    background: rgba(74,124,255,0.08);
    box-shadow: 0 0 20px rgba(74, 124, 255, 0.15);
}

.scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    opacity: 0;
    animation: fadeUp 0.8s ease 1.2s both;
}
.scroll-indicator span {
    font-size: 9px;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--muted);
}
.scroll-line {
    width: 1px;
    height: 30px;
    background: linear-gradient(to bottom, var(--accent), transparent);
    animation: scrollAnim 2s ease infinite;
}
@keyframes scrollAnim {
    0% { opacity: 1; transform: scaleY(1); }
    50% { opacity: 0.3; transform: scaleY(0.5); }
    100% { opacity: 1; transform: scaleY(1); }
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   Section 通用
   ============================================ */
section {
    position: relative;
    z-index: 1;
    padding: 100px 40px;
    border-bottom: 1px solid var(--border);
}
.container {
    max-width: var(--max-w);
    margin: 0 auto;
}

.section-label {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 12px;
    display: block;
}
.section-title {
    font-size: clamp(1.8rem, 3.5vw, 2.8rem);
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.5px;
    margin-bottom: 16px;
}
.section-desc {
    color: var(--muted);
    font-size: 1.05rem;
    font-weight: 300;
    line-height: 1.9;
    max-width: 650px;
}
.section-header {
    margin-bottom: 64px;
}

/* ============================================
   图片容器 — 限高，居中
   ============================================ */
.img-container {
    text-align: center;
    margin: 40px 0;
}
.img-container img {
    max-width: 100%;
    max-height: 460px;
    width: auto;
    height: auto;
    margin: 0 auto;
    border-radius: 8px;
    box-shadow: 0 5px 30px rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border);
}
.img-caption {
    margin-top: 15px;
    font-style: italic;
    color: var(--muted);
    font-size: 0.9rem;
}

/* ============================================
   About
   ============================================ */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.about-text h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 20px;
    line-height: 1.3;
}
.about-text p {
    color: var(--muted);
    font-size: 1rem;
    font-weight: 300;
    line-height: 1.9;
    margin-bottom: 18px;
}

/* 地球可视化（CSS 纯绘制） */
.earth-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    height: 350px;
}
.earth-ring {
    position: absolute;
    border: 1px solid rgba(74,124,255,0.06);
    border-radius: 50%;
    animation: orbitSpin linear infinite;
}
.earth-ring:nth-child(1) { width: 200px; height: 200px; animation-duration: 25s; }
.earth-ring:nth-child(2) { width: 300px; height: 300px; animation-duration: 40s; animation-direction: reverse; }
.earth-ring:nth-child(3) { width: 340px; height: 340px; animation-duration: 55s; }

.earth-ring .sat-dot {
    position: absolute;
    border-radius: 50%;
}
.earth-ring:nth-child(1) .sat-dot {
    width: 8px; height: 8px;
    background: var(--accent);
    box-shadow: 0 0 16px var(--accent-glow);
    top: -4px; left: 50%;
    transform: translateX(-50%);
}
.earth-ring:nth-child(2) .sat-dot {
    width: 5px; height: 5px;
    background: rgba(74,124,255,0.5);
    top: 50%; right: -2.5px;
    transform: translateY(-50%);
}
.earth-ring:nth-child(3) .sat-dot {
    width: 6px; height: 6px;
    background: rgba(110,168,255,0.4);
    bottom: -3px; left: 50%;
    transform: translateX(-50%);
}

.earth-core {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, rgba(74,124,255,0.4), rgba(5,7,10,0.9));
    box-shadow: 0 0 40px var(--accent-glow), inset 0 0 30px rgba(74,124,255,0.05);
    position: relative;
}

/* Stats */
.stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    margin-top: 60px;
    border-top: 1px solid var(--border);
    padding-top: 48px;
}
.stat-item {
    text-align: center;
    border-right: 1px solid var(--border);
    padding: 0 24px;
}
.stat-item:last-child { border-right: none; }
.stat-number {
    font-size: 2.8rem;
    font-weight: 700;
    letter-spacing: -1px;
    background: linear-gradient(135deg, var(--accent), #6ea8ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-label {
    font-size: 12px;
    color: var(--muted);
    letter-spacing: 1px;
    margin-top: 4px;
    text-transform: uppercase;
}

/* ============================================
   Services / Architecture / Applications
   ============================================ */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.service-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 36px 28px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}
.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), var(--accent2), transparent);
    background-size: 200% 100%;
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}
.service-card:hover::before {
    transform: translateX(100%);
    animation: shimmer 1.5s ease infinite;
}
@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}
.service-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(74, 124, 255, 0.1), transparent 60%);
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}
.service-card:hover::after { opacity: 1; }
.service-card:hover {
    border-color: rgba(74,124,255,0.3);
    transform: translateY(-6px);
    box-shadow: 0 20px 60px rgba(0,0,0,0.4), 0 0 40px rgba(74, 124, 255, 0.08);
}
.service-card .num {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--muted);
    margin-bottom: 16px;
    display: block;
}
.service-card h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
}
.service-card p {
    color: var(--muted);
    font-size: 0.93rem;
    font-weight: 300;
    line-height: 1.7;
}

/* ============================================
   Technology — 交错网格 + 统计数据
   ============================================ */
.tech-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.tech-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 40px 32px;
    transition: all 0.4s ease;
    display: flex;
    flex-direction: column;
}
.tech-card:hover {
    border-color: rgba(74,124,255,0.2);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}
.tech-card .num {
    font-size: 2.6rem;
    font-weight: 700;
    color: #6e9cff;
    line-height: 1;
    margin-bottom: 14px;
    text-shadow: 0 0 24px rgba(74, 124, 255, 0.5);
    letter-spacing: -0.02em;
    font-feature-settings: "tnum";
}
.tech-card h4 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 10px;
}
.tech-card p {
    color: var(--muted);
    font-size: 0.93rem;
    font-weight: 300;
    line-height: 1.8;
}

/* ============================================
   Contact
   ============================================ */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}
.contact-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 36px 28px;
    text-align: left;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}
.contact-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--accent) 50%, transparent 100%);
    opacity: 0.5;
}
.contact-card:hover {
    border-color: rgba(74, 124, 255, 0.35);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}
.contact-card .icon-wrap {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(74, 124, 255, 0.3);
    background: rgba(74, 124, 255, 0.08);
    margin-bottom: 20px;
}
.contact-card .icon-wrap svg {
    width: 22px;
    height: 22px;
    fill: none;
    stroke: var(--accent);
    stroke-width: 1.6;
    stroke-linecap: round;
    stroke-linejoin: round;
}
.contact-card .label {
    font-size: 10px;
    color: var(--muted);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 8px;
}
.contact-card .value {
    font-size: 0.95rem;
    color: var(--fg);
    line-height: 1.6;
    font-weight: 500;
}
.contact-card .value a {
    color: var(--fg);
    border-bottom: 1px dashed rgba(74, 124, 255, 0.4);
    transition: all 0.25s;
}
.contact-card .value a:hover {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.contact-cta {
    background: linear-gradient(135deg, rgba(74, 124, 255, 0.12) 0%, rgba(74, 124, 255, 0.04) 100%);
    border: 1px solid rgba(74, 124, 255, 0.25);
    padding: 56px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.contact-cta::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -10%;
    width: 120%;
    height: 200%;
    background: radial-gradient(ellipse at center, rgba(74, 124, 255, 0.1) 0%, transparent 60%);
    pointer-events: none;
}
.contact-cta h3 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 14px;
    position: relative;
}
.contact-cta p {
    color: var(--muted);
    margin-bottom: 28px;
    position: relative;
    max-width: 540px;
    margin-left: auto;
    margin-right: auto;
}
.contact-cta-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    position: relative;
}

/* ============================================
   Footer
   ============================================ */
footer {
    position: relative;
    z-index: 1;
    padding: 32px 40px;
    border-top: 1px solid var(--border);
}
.footer-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}
.footer-copy {
    font-size: 12px;
    color: var(--muted);
}
.footer-links {
    display: flex;
    gap: 20px;
    list-style: none;
}
.footer-links a {
    font-size: 12px;
    color: var(--muted);
    transition: color 0.3s;
    letter-spacing: 1px;
    text-transform: uppercase;
}
.footer-links a:hover { color: var(--fg); }

/* ============================================
   Hero 卫星交互区
   ============================================ */
.hero-sat {
    position: relative;
    height: 680px;
    background: transparent;
    overflow: visible;
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    animation: fadeUp 1s ease 0.6s both;
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}
/* 滚动时卫星保持原位 */
.hero.scrolled .hero-sat {
    transform: none;
}
.hero.scrolled-2 .hero-sat {
    transform: scale(0.85) translateY(-20px);
    opacity: 0.7;
}
.hero-sat::before {
    display: none;
}
.hero-sat::after {
    display: none;
}
.sat-glow {
    position: absolute;
    top: 50%; left: 50%;
    width: 380px; height: 380px;
    transform: translate(-50%, -50%);
    background:
        radial-gradient(circle, rgba(140, 170, 220, 0.12) 0%, rgba(74, 124, 255, 0.04) 40%, transparent 70%);
    pointer-events: none;
    z-index: 0;
    animation: satGlowPulse 6s ease-in-out infinite;
    filter: blur(8px);
}
@keyframes satGlowPulse {
    0%, 100% { opacity: 0.6; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 1; transform: translate(-50%, -50%) scale(1.08); }
}
@keyframes glowPulse {
    0%, 100% { opacity: 0.7; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 1; transform: translate(-50%, -50%) scale(1.15); }
}

.sat-signal, .sat-trail {
    position: absolute;
    top: 50%; left: 50%;
    width: 600px; height: 600px;
    transform: translate(-50%, -50%);
    pointer-events: none;
}
.sat-signal .sig-ring {
    fill: none;
    stroke: rgba(110, 156, 255, 0.55);
    stroke-width: 1.5;
    transform-origin: 300px 300px;
    opacity: 0;
}
.sat-signal.active .sig-ring {
    animation: sigPulse 1.8s ease-out;
}
.sat-signal.active .sig-ring:nth-child(2) { animation-delay: 0.3s; }
.sat-signal.active .sig-ring:nth-child(3) { animation-delay: 0.6s; }
@keyframes sigPulse {
    0% { transform: scale(0.4); opacity: 0.9; stroke-width: 2; }
    100% { transform: scale(4.2); opacity: 0; stroke-width: 0.5; }
}

/* ============================================
   静态真实卫星图片（只加微动效，布局完全不变）
   ============================================ */
.sat-static-img {
    position: relative;
    z-index: 2;
    width: 750px;
    max-width: 95%;
    height: auto;
    user-select: none;
    -webkit-user-drag: none;
    filter: drop-shadow(0 0 60px rgba(74, 124, 255, 0.3)) drop-shadow(0 0 120px rgba(0, 212, 255, 0.15)) contrast(1.05);
    transform: rotate(-15deg);
    transform-origin: center center;
    /* 仅加极其轻微的浮动和光晕呼吸，transform不改变文档流布局 */
    animation: satImgFloat 8s ease-in-out infinite;
}

/* 极其轻微的上下浮动（仅5px，保持旋转角度完全一致） */
@keyframes satImgFloat {
    0%, 100% {
        transform: rotate(-15deg) translateY(0px);
        filter: drop-shadow(0 0 60px rgba(74, 124, 255, 0.3)) drop-shadow(0 0 120px rgba(0, 212, 255, 0.15)) contrast(1.05);
    }
    50% {
        transform: rotate(-15deg) translateY(-5px);
        filter: drop-shadow(0 0 80px rgba(74, 124, 255, 0.4)) drop-shadow(0 0 150px rgba(0, 212, 255, 0.2)) contrast(1.05);
    }
}

/* 卫星轨道光环（防窥效果） */
.sat-glow-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 520px;
    height: 520px;
    margin: -260px 0 0 -260px;
    border-radius: 50%;
    border: 1px solid rgba(74, 124, 255, 0.12);
    box-shadow:
        0 0 40px rgba(74, 124, 255, 0.08),
        inset 0 0 60px rgba(74, 124, 255, 0.05);
    pointer-events: none;
    z-index: 1;
    animation: ringPulse 6s ease-in-out infinite;
}
.sat-glow-ring::before,
.sat-glow-ring::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(74, 124, 255, 0.08);
}
.sat-glow-ring::before {
    inset: 30px;
    border-color: rgba(100, 160, 255, 0.1);
}
.sat-glow-ring::after {
    inset: 70px;
    border-color: rgba(74, 124, 255, 0.06);
    border-style: dashed;
    animation: ringRotate 30s linear infinite;
}
@keyframes ringPulse {
    0%, 100% { opacity: 0.6; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.03); }
}
@keyframes ringRotate {
    to { transform: rotate(360deg); }
}

.sat-3d-scene {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    transform-style: preserve-3d;
    transition: transform 0.08s linear;
    will-change: transform;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.5));
}

/* ========== 卫星主体（3D长方体 140w x 200h x 70d） ========== */
.sat-body-group {
    position: absolute;
    transform-style: preserve-3d;
}
.sat-face {
    position: absolute;
    transform-style: preserve-3d;
    box-sizing: border-box;
}
/* 正面 */
.sat-face-front {
    width: 140px;
    height: 200px;
    margin: -100px 0 0 -70px;
    background: linear-gradient(180deg,
        #d0d6e2 0%,
        #c0c8d8 12%,
        #98a2b8 38%,
        #6e7890 72%,
        #485064 100%
    );
    border: 1px solid #3a4254;
    transform: translateZ(35px);
}
/* 背面 */
.sat-face-back {
    width: 140px;
    height: 200px;
    margin: -100px 0 0 -70px;
    background: linear-gradient(180deg, #6e7890, #3a4254);
    border: 1px solid #2a3040;
    transform: translateZ(-35px) rotateY(180deg);
}
/* 左面 */
.sat-face-left {
    width: 70px;
    height: 200px;
    margin: -100px 0 0 -35px;
    background: linear-gradient(90deg, #5a6478, #3a4254);
    border: 1px solid #2a3040;
    transform: translateX(-70px) rotateY(-90deg);
}
/* 右面 */
.sat-face-right {
    width: 70px;
    height: 200px;
    margin: -100px 0 0 -35px;
    background: linear-gradient(90deg, #7a8498, #4a5468);
    border: 1px solid #2a3040;
    transform: translateX(70px) rotateY(90deg);
}
/* 顶面 */
.sat-face-top {
    width: 140px;
    height: 70px;
    margin: -35px 0 0 -70px;
    background: linear-gradient(135deg, #e0e6f0, #8894a8);
    border: 1px solid #4a5468;
    transform: translateY(-100px) rotateX(90deg);
}
/* 底面 */
.sat-face-bottom {
    width: 140px;
    height: 70px;
    margin: -35px 0 0 -70px;
    background: linear-gradient(180deg, #505a6e, #282e3c);
    border: 1px solid #2a3040;
    transform: translateY(100px) rotateX(-90deg);
}

/* 正面细节 - 金箔保温层 */
.body-gold-top {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 20px;
    background: linear-gradient(135deg, #c9a062 0%, #a07838 25%, #6e5020 60%, #3d2c10 100%);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.body-gold-top::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, rgba(255,220,160,0.3), transparent);
}
.body-gold-bot {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 20px;
    background: linear-gradient(135deg, #b89050 0%, #9a7030 40%, #5a4018 100%);
    border-top: 1px solid rgba(0,0,0,0.2);
}
.body-gold-bot::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: rgba(0,0,0,0.3);
}

/* 中央设备面板 */
.body-center-panel {
    position: absolute;
    top: 20px;
    left: 12px;
    right: 12px;
    bottom: 20px;
}
/* 主星敏感器镜头 */
.body-lens-main {
    position: absolute;
    top: 10px;
    left: 8px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: radial-gradient(circle at 38% 32%, #7a98c0 0%, #3c5880 18%, #0e1828 55%, #010204 100%);
    border: 1.5px solid #5a6a88;
    box-shadow: inset 0 0 8px rgba(0,0,0,0.8);
}
.lens-reflection {
    position: absolute;
    top: 6px;
    left: 8px;
    width: 10px;
    height: 8px;
    background: radial-gradient(ellipse, rgba(255,255,255,0.7), transparent);
    border-radius: 50%;
}
.lens-reflection::after {
    content: '';
    position: absolute;
    bottom: -4px;
    right: -2px;
    width: 4px;
    height: 4px;
    background: rgba(255,255,255,0.8);
    border-radius: 50%;
}
.lens-hood {
    position: absolute;
    top: -6px;
    left: -4px;
    width: 44px;
    height: 12px;
    background: linear-gradient(180deg, #3a4254, #2a3244);
    border: 0.5px solid #4a5668;
    border-radius: 2px 2px 0 0;
    clip-path: polygon(0 100%, 8% 0, 92% 0, 100% 100%);
}
/* 辅助镜头 */
.body-lens-small {
    position: absolute;
    top: 14px;
    left: 54px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: radial-gradient(circle at 40% 30%, #6080a8, #1a2840 60%, #020408 100%);
    border: 1px solid #4a5668;
    box-shadow: inset 0 0 4px rgba(0,0,0,0.8);
}
.body-lens-small::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 4px;
    width: 4px;
    height: 3px;
    background: rgba(255,255,255,0.4);
    border-radius: 50%;
}
/* LED指示灯 */
.body-leds {
    position: absolute;
    top: 6px;
    right: 8px;
    display: flex;
    gap: 6px;
}
.led {
    width: 6px;
    height: 6px;
    border-radius: 1px;
    animation: ledPulse 2s ease-in-out infinite;
}
.led-g { background: #4ade80; box-shadow: 0 0 6px #4ade80; animation-delay: 0s; }
.led-y { background: #facc15; box-shadow: 0 0 6px #facc15; animation-delay: 0.5s; opacity: 0.7; }
.led-b { background: #60a5fa; box-shadow: 0 0 6px #60a5fa; animation-delay: 1s; }
.led-r { background: #f87171; box-shadow: 0 0 6px #f87171; animation-delay: 1.5s; opacity: 0.6; }
@keyframes ledPulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}
/* 标识带 */
.body-label {
    position: absolute;
    top: 62px;
    left: -12px;
    right: -12px;
    height: 30px;
    background: #050810;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-top: 0.5px solid #1a2848;
    border-bottom: 0.5px solid #1a2848;
}
.body-label b {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: #7098d0;
    letter-spacing: 4px;
    font-weight: 500;
}
.body-label span {
    font-family: 'JetBrains Mono', monospace;
    font-size: 6px;
    color: #4a6898;
    letter-spacing: 2px;
    margin-top: 1px;
}
/* 散热格栅 */
.body-thermal {
    position: absolute;
    top: 104px;
    left: 0;
    right: 0;
    height: 50px;
    background: repeating-linear-gradient(
        0deg,
        transparent 0px,
        transparent 6px,
        rgba(40, 50, 70, 0.8) 6px,
        rgba(40, 50, 70, 0.8) 7px
    );
}
/* 检修舱门 */
.body-hatch {
    position: absolute;
    bottom: 8px;
    left: 4px;
    width: 44px;
    height: 44px;
    border: 1px solid #4a5468;
    border-radius: 2px;
    background: linear-gradient(180deg, rgba(90,100,120,0.1), rgba(50,60,80,0.2));
}
.body-hatch::before,
.body-hatch::after {
    content: '';
    position: absolute;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: #4a5468;
}
.body-hatch::before { top: 4px; left: 4px; box-shadow: 32px 0 0 #4a5468; }
.body-hatch::after { bottom: 4px; left: 4px; box-shadow: 32px 0 0 #4a5468; }
.hatch-handle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 12px;
    height: 8px;
    border: 1px solid #4a5468;
    border-radius: 2px;
    background: #3a4254;
}
/* 数据接口面板 */
.body-ports {
    position: absolute;
    bottom: 8px;
    right: 4px;
    width: 44px;
    height: 44px;
    background: #080c16;
    border: 0.5px solid #3a4254;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: 2px;
    padding: 3px;
    box-sizing: border-box;
}
.body-ports::before {
    content: '';
    display: block;
    background: #1a2438;
    border: 0.5px solid #2a3854;
    border-radius: 1px;
    grid-column: 1; grid-row: 1;
    box-shadow: 10px 0 0 #1a2438, 20px 0 0 #1a2438,
                0 10px 0 #1a2438, 10px 10px 0 #1a2438, 20px 10px 0 #1a2438,
                0 20px 0 #1a2438, 10px 20px 0 #1a2438, 20px 20px 0 #1a2438;
}
/* 顶面金箔 */
.top-gold {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #d4a860, #8a6828);
}
.bot-gold {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 10px;
    background: linear-gradient(180deg, #9a7030, #6a4c1c);
}

/* 主推进器喷管（在底面） */
.main-nozzle {
    position: absolute;
    bottom: -22px;
    left: 50%;
    transform: translateX(-50%);
    width: 52px;
    height: 24px;
    transform-style: preserve-3d;
}
.nozzle-rim {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) rotateX(75deg);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: radial-gradient(circle, #080a10 30%, #2a3244 50%, #4a5468 100%);
    border: 2px solid #5a6478;
    transform-origin: center bottom;
}
/* 喷管钟形 - 用梯形表示 */
.main-nozzle::before {
    content: '';
    position: absolute;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    width: 32px;
    height: 20px;
    background: linear-gradient(180deg, #3a4254, #2a3040);
    clip-path: polygon(15% 0, 85% 0, 100% 100%, 0% 100%);
    border-left: 1px solid #2a3040;
    border-right: 1px solid #2a3040;
}
.nozzle-throat {
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 6px;
    border-radius: 50%;
    background: #04060a;
    box-shadow: 0 0 8px rgba(160,200,255,0);
    transition: box-shadow 0.2s;
}

/* ========== 太阳能板连接臂 ========== */
.sat-boom {
    position: absolute;
    height: 12px;
    width: 30px;
    background: linear-gradient(180deg, #c0c8d8, #4a5264);
    border: 0.5px solid #3a4254;
    transform-style: preserve-3d;
}
.sat-boom-left {
    transform: translateX(-100px) translateY(-6px) translateZ(0);
}
.sat-boom-right {
    transform: translateX(70px) translateY(-6px) translateZ(0);
}
/* 铰链 */
.sat-hinge {
    position: absolute;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, #8090a8, #3a4254);
    border: 0.8px solid #2a3040;
    transform-style: preserve-3d;
}
.sat-hinge::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: #6a7890;
}
.sat-hinge-left {
    transform: translateX(-105px) translateY(-5px) translateZ(0);
}
.sat-hinge-right {
    transform: translateX(95px) translateY(-5px) translateZ(0);
}

/* ========== 太阳能板（3D有厚度） ========== */
.sat-panel {
    position: absolute;
    transform-style: preserve-3d;
}
.sat-panel-left {
    transform: translateX(-310px) translateY(-48px) translateZ(0);
}
.sat-panel-right {
    transform: translateX(105px) translateY(-48px) translateZ(0);
}
.panel-face {
    position: absolute;
    box-sizing: border-box;
}
/* 面板尺寸：200w x 96h x 6d */
.panel-front {
    width: 200px;
    height: 96px;
    margin: 0 0 0 -100px;
    background: linear-gradient(180deg, #0c1220, #0d1525 50%, #080c14);
    border: 1px solid #2a3448;
    transform: translateZ(3px);
    overflow: hidden;
}
.panel-back {
    width: 200px;
    height: 96px;
    margin: 0 0 0 -100px;
    background: linear-gradient(180deg, #0a0f1a, #060a12);
    border: 1px solid #1a2438;
    transform: translateZ(-3px) rotateY(180deg);
}
.panel-edge-t {
    width: 200px;
    height: 6px;
    margin: -3px 0 0 -100px;
    background: linear-gradient(180deg, #2a3858, #1c2842);
    transform: translateY(-48px) rotateX(90deg);
}
.panel-edge-b {
    width: 200px;
    height: 6px;
    margin: -3px 0 0 -100px;
    background: linear-gradient(0deg, #2a3858, #0e1628);
    transform: translateY(48px) rotateX(-90deg);
}
.panel-edge-l {
    width: 6px;
    height: 96px;
    margin: -48px 0 0 -3px;
    background: linear-gradient(90deg, #2a3858, #0e1628);
    transform: translateX(-100px) rotateY(-90deg);
}
.panel-edge-r {
    width: 6px;
    height: 96px;
    margin: -48px 0 0 -3px;
    background: linear-gradient(90deg, #0e1628, #2a3858);
    transform: translateX(100px) rotateY(90deg);
}
/* 电池单元网格 - 5列4行 */
.panel-grid {
    position: absolute;
    top: 4px;
    left: 4px;
    right: 4px;
    bottom: 4px;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    grid-template-rows: repeat(4, 1fr);
    gap: 2px;
}
.panel-grid::before {
    content: '';
    background: linear-gradient(180deg, #1a2640, #070b14);
    border: 0.3px solid #253048;
    box-shadow:
        /* 第1行 */
        38px 0 0 0 linear-gradient(180deg, #152036, #060a12),
        76px 0 0 0 linear-gradient(180deg, #1a2640, #070b14),
        114px 0 0 0 linear-gradient(180deg, #152036, #060a12),
        152px 0 0 0 linear-gradient(180deg, #1a2640, #070b14),
        /* 第2行 */
        0 22px 0 0 linear-gradient(180deg, #152036, #060a12),
        38px 22px 0 0 linear-gradient(180deg, #1a2640, #070b14),
        76px 22px 0 0 linear-gradient(180deg, #152036, #060a12),
        114px 22px 0 0 linear-gradient(180deg, #1a2640, #070b14),
        152px 22px 0 0 linear-gradient(180deg, #152036, #060a12),
        /* 第3行 */
        0 44px 0 0 linear-gradient(180deg, #1a2640, #070b14),
        38px 44px 0 0 linear-gradient(180deg, #152036, #060a12),
        76px 44px 0 0 linear-gradient(180deg, #1a2640, #070b14),
        114px 44px 0 0 linear-gradient(180deg, #152036, #060a12),
        152px 44px 0 0 linear-gradient(180deg, #1a2640, #070b14),
        /* 第4行 */
        0 66px 0 0 linear-gradient(180deg, #152036, #060a12),
        38px 66px 0 0 linear-gradient(180deg, #1a2640, #070b14),
        76px 66px 0 0 linear-gradient(180deg, #152036, #060a12),
        114px 66px 0 0 linear-gradient(180deg, #1a2640, #070b14),
        152px 66px 0 0 linear-gradient(180deg, #152036, #060a12);
    border: 0.3px solid #253048;
}
/* 汇流条 */
.panel-busbar {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: rgba(58, 72, 104, 0.5);
    transform: translateY(-0.5px);
}
/* 面板高光 */
.panel-shine {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg,
        transparent 0%,
        rgba(168, 192, 224, 0.15) 40%,
        rgba(200, 216, 240, 0.22) 50%,
        rgba(168, 192, 224, 0.15) 60%,
        transparent 100%
    );
    animation: panelShineMove 6s ease-in-out infinite;
}
@keyframes panelShineMove {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 0.8; }
}

/* ========== 顶部Ka频段抛物面天线 ========== */
.sat-dish-group {
    position: absolute;
    transform-style: preserve-3d;
    transform: translateY(-130px) translateZ(0);
}
.dish-mast {
    position: absolute;
    left: -6px;
    top: 0;
    width: 12px;
    height: 30px;
    background: linear-gradient(90deg, #808ca0, #b0b8c8 50%, #606a7e);
    border: 0.5px solid #3a4254;
    transform-style: preserve-3d;
}
/* 抛物面反射器 - 用椭圆模拟 */
.dish-reflector {
    position: absolute;
    top: -22px;
    left: -50px;
    width: 100px;
    height: 32px;
    background: linear-gradient(180deg, #d8dde8, #687288);
    border-radius: 50%;
    border: 1px solid #4a5064;
    transform: rotateX(20deg);
    transform-style: preserve-3d;
    box-shadow: inset 0 -4px 8px rgba(0,0,0,0.3);
}
.dish-inner {
    position: absolute;
    top: 6px;
    left: 12px;
    right: 12px;
    bottom: 4px;
    border-radius: 50%;
    background: radial-gradient(ellipse at center top, #202838, #080c14);
    border: 0.5px solid rgba(90, 122, 170, 0.4);
}
.dish-rings {
    position: absolute;
    top: 10px;
    left: 20px;
    right: 20px;
    bottom: 6px;
    border-radius: 50%;
    border: 0.5px solid rgba(90, 122, 170, 0.25);
    box-shadow: inset 0 0 0 8px transparent, inset 0 0 0 9px rgba(90, 122, 170, 0.15);
}
/* 副反射面 */
.dish-subreflector {
    position: absolute;
    top: -48px;
    left: -5px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, #c0cadc, #5a6478);
    border: 0.5px solid #4a5468;
}
/* 支架 */
.dish-strut {
    position: absolute;
    width: 2px;
    background: linear-gradient(180deg, #8a94a8, #606a7e);
    transform-origin: bottom center;
}
.dish-strut-l {
    height: 30px;
    top: -28px;
    left: -18px;
    transform: rotateZ(-25deg);
}
.dish-strut-r {
    height: 30px;
    top: -28px;
    left: 16px;
    transform: rotateZ(25deg);
}
/* 馈源 */
.dish-feed {
    position: absolute;
    top: -56px;
    left: -3px;
    width: 6px;
    height: 18px;
    background: linear-gradient(180deg, #6a7488, #4a5468);
    border: 0.5px solid #3a4254;
}
.dish-feed::after {
    content: '';
    position: absolute;
    top: -6px;
    left: -2px;
    width: 10px;
    height: 6px;
    border-radius: 50%;
    background: radial-gradient(circle, #c0d4f0, #6090d0);
    box-shadow: 0 0 10px rgba(140, 180, 240, 0.5);
}

/* ========== 两侧S频段全向天线 ========== */
.sat-antenna {
    position: absolute;
    transform-style: preserve-3d;
}
.sat-antenna-left {
    transform: translateX(-85px) translateY(-90px) translateZ(0) rotateZ(35deg);
    transform-origin: bottom left;
}
.sat-antenna-right {
    transform: translateX(85px) translateY(-90px) translateZ(0) rotateZ(-35deg);
    transform-origin: bottom right;
}
.antenna-mast {
    width: 2px;
    height: 32px;
    background: linear-gradient(90deg, #6a7488, #9aa9c9, #6a7488);
    margin-left: -1px;
}
.antenna-tip {
    position: absolute;
    top: -10px;
    left: -4px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, #e0e6f0, #606a7e);
    border: 0.5px solid #505a6e;
}
.antenna-tip::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: rgba(255,255,255,0.4);
}

/* ========== 顶部太阳敏感器伸杆 ========== */
.sat-sensor-mast {
    position: absolute;
    transform-style: preserve-3d;
    transform: translateY(-175px) translateZ(0);
}
.sat-sensor-mast::before {
    content: '';
    position: absolute;
    left: -1.5px;
    top: 0;
    width: 3px;
    height: 50px;
    background: linear-gradient(90deg, #5a6478, #8a94a8 50%, #5a6478);
}
.sensor-head {
    position: absolute;
    top: -14px;
    left: -7px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, #d0d8e4, #5a6478);
    border: 0.5px solid #4a5468;
}
.sensor-lens {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: radial-gradient(circle at 40% 30%, #7098d0, #1a2848);
}
.sensor-lens::after {
    content: '';
    position: absolute;
    top: 1px;
    left: 1px;
    width: 2px;
    height: 2px;
    background: rgba(255,255,255,0.6);
    border-radius: 50%;
}

/* ========== 姿态控制推进器 ========== */
.rcs-thruster {
    position: absolute;
    width: 10px;
    height: 7px;
    background: linear-gradient(180deg, #5a6478, #3a4254);
    border: 0.5px solid #2a3040;
    border-radius: 1px;
    transform-style: preserve-3d;
}
.rcs-tl { transform: translateX(-80px) translateY(-92px) translateZ(0) rotateZ(-35deg); }
.rcs-tr { transform: translateX(70px) translateY(-92px) translateZ(0) rotateZ(35deg); }
.rcs-bl { transform: translateX(-80px) translateY(85px) translateZ(0) rotateZ(35deg); }
.rcs-br { transform: translateX(70px) translateY(85px) translateZ(0) rotateZ(-35deg); }

/* ========== 推进器喷焰 ========== */
.sat-thrust-group {
    position: absolute;
    transform-style: preserve-3d;
    transform: translateY(120px) translateZ(0);
}
.thrust-plume {
    position: absolute;
    left: -22px;
    top: 0;
    width: 44px;
    height: 70px;
    background: radial-gradient(ellipse at 50% 0%,
        rgba(160,200,255,0.35) 0%,
        rgba(100,150,220,0.2) 30%,
        rgba(60,100,160,0.08) 60%,
        transparent 100%
    );
    border-radius: 50% 50% 50% 50% / 20% 20% 80% 80%;
    opacity: 0;
    transform: scaleY(0);
    transform-origin: top center;
    transition: opacity 0.2s;
}
.thrust-core {
    position: absolute;
    left: -10px;
    top: 0;
    width: 20px;
    height: 40px;
    background: radial-gradient(ellipse at 50% 0%,
        #ffffff 0%,
        #d0e0ff 25%,
        rgba(130,170,220,0.5) 55%,
        transparent 100%
    );
    border-radius: 50% 50% 50% 50% / 15% 15% 85% 85%;
    opacity: 0;
    transform: scaleY(0);
    transform-origin: top center;
    transition: opacity 0.15s;
}
.thrust-plume.on,
.thrust-core.on {
    opacity: 1;
    transform: scaleY(1);
    animation: thrustFlicker 0.08s ease-in-out infinite alternate;
}
@keyframes thrustFlicker {
    0% { opacity: 0.85; }
    100% { opacity: 1; }
}
.rcs-plume {
    position: absolute;
    width: 6px;
    height: 18px;
    background: radial-gradient(ellipse at 50% 100%,
        rgba(200,220,255,0.9) 0%,
        rgba(130,170,220,0.5) 40%,
        transparent 100%
    );
    border-radius: 50%;
    opacity: 0;
    transform-origin: center bottom;
}
.rcs-tl { left: -84px; top: -80px; transform: rotateZ(-125deg); }
.rcs-tr { left: 78px; top: -80px; transform: rotateZ(125deg); }
.rcs-bl { left: -84px; top: 88px; transform: rotateZ(-55deg); }
.rcs-br { left: 78px; top: 88px; transform: rotateZ(55deg); }
.rcs-plume.on {
    opacity: 1;
    animation: rcsFlicker 0.06s ease-in-out infinite alternate;
}
@keyframes rcsFlicker {
    0% { opacity: 0.7; height: 14px; }
    100% { opacity: 1; height: 20px; }
}

/* ========== Hover交互效果 ========== */
.sat-3d-scene:hover .sat-face-front {
    filter: brightness(1.05);
}
.thrust-on .nozzle-throat {
    box-shadow: 0 0 16px rgba(160,200,255,0.8), 0 0 30px rgba(100,160,255,0.4);
}

.sat-tooltip {
    position: absolute;
    top: 24px; right: 24px;
    background: rgba(5, 8, 19, 0.92);
    border: 1px solid var(--border-hot);
    padding: 12px 16px;
    min-width: 220px;
    max-width: 280px;
    backdrop-filter: blur(10px);
    opacity: 0;
    transform: translateY(-6px);
    transition: opacity 0.25s, transform 0.25s;
    pointer-events: none;
    z-index: 10;
}
.sat-tooltip.show { opacity: 1; transform: translateY(0); }
.sat-tooltip .tt-part {
    font-size: 13px;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 4px;
    letter-spacing: 1px;
}
.sat-tooltip .tt-desc {
    font-size: 11px;
    color: var(--fg-2);
    line-height: 1.5;
}

.sat-hint {
    position: absolute;
    bottom: 18px; left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 3px;
    color: var(--muted);
    padding: 6px 16px;
    background: rgba(5, 8, 19, 0.6);
    border: 1px solid var(--card-border);
    transition: opacity 0.4s;
    z-index: 5;
}
.sat-hint.hide { opacity: 0; }

.sat-controls-overlay {
    position: absolute;
    bottom: 16px; right: 16px;
    display: flex;
    gap: 8px;
    z-index: 10;
}
.sat-readout-overlay {
    position: absolute;
    top: 16px; left: 16px;
    display: flex;
    gap: 18px;
    z-index: 10;
    padding: 10px 14px;
    background: rgba(5, 8, 19, 0.7);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(10px);
}
.sat-readout-overlay span {
    display: flex;
    flex-direction: column;
    gap: 2px;
    line-height: 1.1;
}
.sat-readout-overlay i {
    font-style: normal;
    font-family: var(--font-mono);
    font-size: 8.5px;
    letter-spacing: 2px;
    color: var(--muted);
    text-transform: uppercase;
}
.sat-readout-overlay b {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--accent);
    font-weight: 600;
    text-shadow: 0 0 8px rgba(74, 124, 255, 0.45);
}
.sat-btn {
    background: rgba(5, 8, 19, 0.8);
    border: 1px solid var(--border-hot);
    color: var(--fg-2);
    padding: 8px 12px;
    font-family: var(--font-mono);
    font-size: 10.5px;
    letter-spacing: 1.2px;
    cursor: pointer;
    transition: all 0.25s;
    backdrop-filter: blur(10px);
}
.sat-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(74, 124, 255, 0.12);
}
.sat-btn[data-on="true"] {
    color: var(--accent);
    border-color: var(--accent);
}
.sat-btn.active {
    color: #ffd08a;
    border-color: #ff8a3c;
    box-shadow: 0 0 16px rgba(255, 138, 60, 0.4);
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1024px) {
    .about-grid { grid-template-columns: 1fr; gap: 40px; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .earth-visual { height: 260px; }
    .hero-orbits { transform: translateY(-50%) scale(0.7); right: 0; }

    .hero-grid { grid-template-columns: 1fr; gap: 32px; }
    .hero-content { align-items: center; text-align: center; }
    .hero h1 { text-align: center; }
    .hero p { text-align: center; }
    .hero-sat { height: 500px; }
    .sat-3d { width: 500px; height: 460px; }
    
    /* 移动端视差效果减弱 */
    .hero.scrolled .hero-sat {
        transform: scale(0.95) translateY(-10px);
    }
    .hero.scrolled-2 .hero-sat {
        transform: scale(0.9) translateY(-20px);
        opacity: 0.7;
    }
    .hero.scrolled .hero-content {
        opacity: 0.5;
        transform: translateY(-40px);
    }
    .hero.scrolled-2 .hero-content {
        opacity: 0;
        transform: translateY(-60px);
    }
}

@media (max-width: 768px) {
    html { font-size: 16px; }

    .navbar { padding: 0 16px; }
    .nav-links { display: none; }
    .hamburger { display: flex; }
    .navbar .logo-text .cn { font-size: 13px; }
    .navbar .logo-text .en { font-size: 7px; }

    .hero { padding: 80px 20px 60px; }
    .hero-content { max-width: 100%; }
    .hero h1 { font-size: clamp(1.8rem, 9vw, 2.8rem); }
    .hero p { font-size: 0.95rem; max-width: 100%; }
    .lang-toggle { padding: 5px 10px; font-size: 11px; margin-right: 8px; }
    .hero-badge { font-size: 10px; padding: 6px 14px; }
    .orbit-container { transform: translate(-50%, -50%) scale(0.4); }
    .scroll-indicator { display: none; }

    section { padding: 56px 20px; }
    .section-header { margin-bottom: 32px; }
    .section-title { font-size: clamp(1.5rem, 6vw, 2rem); }
    .section-desc { font-size: 0.95rem; max-width: 100%; }

    .services-grid { grid-template-columns: 1fr; gap: 16px; }
    .service-card { padding: 28px 24px; }

    .tech-grid { grid-template-columns: 1fr; gap: 16px; }
    .tech-card { padding: 32px 24px; }

    .stats-row { grid-template-columns: 1fr; gap: 24px; }
    .stat-item { border-right: none; }
    .stat-number { font-size: 2.2rem; }

    .earth-visual { height: 220px; }
    .earth-core { width: 60px; height: 60px; }
    .earth-ring:nth-child(1) { width: 160px; height: 160px; }
    .earth-ring:nth-child(2) { width: 240px; height: 240px; }
    .earth-ring:nth-child(3) { width: 270px; height: 270px; }

    .contact-grid { grid-template-columns: 1fr; gap: 20px; }
    .contact-card { padding: 28px 22px; }
    .contact-cta { padding: 40px 24px; }
    .contact-cta h3 { font-size: 1.4rem; }

    .hero-sat { height: 420px; }
    .sat-3d { width: 400px; height: 360px; }
    .sat-controls-overlay { flex-wrap: wrap; max-width: 140px; }
    .sat-btn { font-size: 9px; padding: 6px 9px; letter-spacing: 1px; }
    .sat-readout-overlay { gap: 10px; padding: 8px 10px; }
    .sat-readout-overlay i { font-size: 7.5px; }
    .sat-readout-overlay b { font-size: 10px; }
    .sat-tooltip { top: 8px; right: 8px; left: 8px; min-width: 0; max-width: none; padding: 8px 10px; }
    .sat-tooltip .tt-part { font-size: 11px; }
    .sat-tooltip .tt-desc { font-size: 10px; }

    .footer-inner { flex-direction: column; text-align: center; gap: 12px; }
    .footer-copy { font-size: 11px; line-height: 1.6; }

    .img-container img { max-height: 360px; }
}

@media (max-width: 480px) {
    html { font-size: 15px; }

    .hero { padding: 70px 16px 50px; }
    .hero h1 { font-size: clamp(1.5rem, 8vw, 2rem); }
    .hero p { font-size: 0.9rem; }
    .orbit-container { transform: translate(-50%, -50%) scale(0.3); }
    .hero-badge { font-size: 9px; padding: 5px 12px; letter-spacing: 1.5px; }
    .hero-actions { flex-direction: column; align-items: center; gap: 12px; }
    .btn { width: 100%; justify-content: center; padding: 14px 24px; font-size: 14px; }

    section { padding: 40px 16px; }
    .about-text h3 { font-size: 1.2rem; }
    .service-card { padding: 24px 20px; }
    .service-card h4 { font-size: 1rem; }
    .service-card p { font-size: 0.85rem; }
    .tech-card { padding: 28px 20px; }
    .tech-card h4 { font-size: 1rem; }
    .tech-card p { font-size: 0.85rem; }
    .section-title { font-size: 1.4rem; }
    .contact-cta-actions { flex-direction: column; }
    .contact-cta-actions .btn { width: 100%; }

    .img-container img { max-height: 300px; }
}

/* ============================================
   滚动动效
   ============================================ */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.rd-1 { transition-delay: 0.1s; }
.rd-2 { transition-delay: 0.2s; }
.rd-3 { transition-delay: 0.3s; }
.rd-4 { transition-delay: 0.4s; }