/* ============================================
   盐城铁旗科技有限公司 - 官网首页样式
   Color: Deep Navy + Tech Blue + Gold Accent
   ============================================ */

:root {
    --deep-navy: #0A1628;
    --steel-blue: #122240;
    --card-dark: #152238;
    --tech-blue: #2E86DE;
    --cyan-glow: #00D2FF;
    --gold: #D4A843;
    --gold-light: #E8C97A;
    --white: #FFFFFF;
    --off-white: #F0F4F8;
    --light-gray: #E8ECF1;
    --text-gray: #8896A8;
    --dark-gray: #2C3E50;
    --gradient-tech: linear-gradient(135deg, #2E86DE 0%, #00D2FF 100%);
    --gradient-gold: linear-gradient(135deg, #D4A843 0%, #E8C97A 100%);
    --gradient-dark: linear-gradient(180deg, #0A1628 0%, #122240 100%);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 30px rgba(46, 134, 222, 0.15);
    --transition-base: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
    background: var(--deep-navy);
}

.serif-font {
    font-family: 'Noto Serif SC', serif;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-base);
}

img {
    max-width: 100%;
    height: auto;
}

/* ===== 页面加载动画 ===== */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--deep-navy);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

.page-loader.loaded {
    opacity: 0;
    visibility: hidden;
}

.loader-ring {
    width: 60px;
    height: 60px;
    border: 3px solid rgba(46, 134, 222, 0.2);
    border-top-color: var(--cyan-glow);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loader-text {
    color: var(--gold);
    font-size: 14px;
    letter-spacing: 6px;
    margin-top: 20px;
    text-align: center;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== 顶部信息栏 ===== */
.top-bar {
    background: rgba(10, 22, 40, 0.95);
    padding: 8px 0;
    font-size: 13px;
    border-bottom: 1px solid rgba(46, 134, 222, 0.1);
}

.top-bar a {
    color: var(--text-gray);
}

.top-bar a:hover {
    color: var(--cyan-glow);
}

.top-bar i {
    color: var(--tech-blue);
    margin-right: 6px;
    font-size: 12px;
}

.top-bar-left span {
    color: var(--text-gray);
    margin-right: 25px;
}

.top-bar-right a {
    margin-left: 18px;
    font-size: 14px;
}

/* ===== 导航栏 ===== */
.navbar-custom {
    background: rgba(10, 22, 40, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 14px 0;
    transition: var(--transition-base);
    border-bottom: 1px solid rgba(46, 134, 222, 0.08);
    z-index: 1000;
}

.navbar-custom.scrolled {
    background: rgba(10, 22, 40, 0.98);
    padding: 10px 0;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.brand-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-icon {
    width: 42px;
    height: 42px;
    background: var(--gradient-tech);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.brand-icon::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent 40%, rgba(255,255,255,0.15) 50%, transparent 60%);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%) rotate(45deg); }
    100% { transform: translateX(100%) rotate(45deg); }
}

.brand-text {
    font-size: 22px;
    font-weight: 700;
    color: var(--white);
    letter-spacing: 2px;
}

.brand-text small {
    display: block;
    font-size: 10px;
    font-weight: 400;
    color: var(--text-gray);
    letter-spacing: 3px;
    margin-top: -2px;
}

.navbar-custom .nav-link {
    color: rgba(255, 255, 255, 0.8);
    font-size: 15px;
    font-weight: 500;
    padding: 8px 18px !important;
    position: relative;
    letter-spacing: 0.5px;
}

.navbar-custom .nav-link::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 18px;
    right: 18px;
    height: 2px;
    background: var(--gradient-tech);
    transform: scaleX(0);
    transition: transform 0.3s ease;
    border-radius: 2px;
}

.navbar-custom .nav-link:hover,
.navbar-custom .nav-link.active {
    color: var(--white);
}

.navbar-custom .nav-link:hover::after,
.navbar-custom .nav-link.active::after {
    transform: scaleX(1);
}

.nav-cta {
    background: var(--gradient-tech) !important;
    color: var(--white) !important;
    border-radius: 6px !important;
    padding: 8px 24px !important;
    font-weight: 600 !important;
    letter-spacing: 1px !important;
}

.nav-cta::after {
    display: none !important;
}

.nav-cta:hover {
    box-shadow: 0 4px 20px rgba(46, 134, 222, 0.4);
    transform: translateY(-1px);
}

.navbar-toggler {
    border: 1px solid rgba(46, 134, 222, 0.3);
    padding: 6px 10px;
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0, 210, 255, 0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* ===== Hero 区 ===== */
.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--deep-navy);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(ellipse 80% 60% at 20% 50%, rgba(46, 134, 222, 0.12) 0%, transparent 60%),
        radial-gradient(ellipse 60% 50% at 80% 30%, rgba(0, 210, 255, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse 40% 40% at 60% 80%, rgba(212, 168, 67, 0.06) 0%, transparent 50%);
}

.hero-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(46, 134, 222, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(46, 134, 222, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 70%);
}

.hero-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: var(--cyan-glow);
    border-radius: 50%;
    opacity: 0;
    animation: float-particle 8s infinite;
}

.particle:nth-child(1) { left: 10%; top: 20%; animation-delay: 0s; animation-duration: 7s; }
.particle:nth-child(2) { left: 25%; top: 60%; animation-delay: 1s; animation-duration: 9s; }
.particle:nth-child(3) { left: 40%; top: 30%; animation-delay: 2s; animation-duration: 6s; }
.particle:nth-child(4) { left: 55%; top: 70%; animation-delay: 3s; animation-duration: 8s; }
.particle:nth-child(5) { left: 70%; top: 40%; animation-delay: 0.5s; animation-duration: 10s; }
.particle:nth-child(6) { left: 85%; top: 55%; animation-delay: 2.5s; animation-duration: 7.5s; }
.particle:nth-child(7) { left: 15%; top: 80%; animation-delay: 4s; animation-duration: 6.5s; }
.particle:nth-child(8) { left: 60%; top: 15%; animation-delay: 1.5s; animation-duration: 8.5s; }
.particle:nth-child(9) { left: 90%; top: 75%; animation-delay: 3.5s; animation-duration: 9.5s; }
.particle:nth-child(10) { left: 35%; top: 90%; animation-delay: 5s; animation-duration: 7s; }

@keyframes float-particle {
    0% { opacity: 0; transform: translateY(0) scale(0.5); }
    20% { opacity: 0.8; }
    80% { opacity: 0.3; }
    100% { opacity: 0; transform: translateY(-120px) scale(1.2); }
}

.hero-content {
    position: relative;
    z-index: 2;
    padding-top: 80px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(46, 134, 222, 0.1);
    border: 1px solid rgba(46, 134, 222, 0.25);
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 13px;
    color: var(--cyan-glow);
    margin-bottom: 28px;
    letter-spacing: 1px;
}

.hero-badge i {
    font-size: 10px;
    animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.hero-title {
    font-size: clamp(36px, 5vw, 64px);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--white);
}

.hero-title .highlight {
    background: var(--gradient-tech);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title .gold {
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(16px, 2vw, 20px);
    color: var(--text-gray);
    max-width: 600px;
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-btns {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn-tech {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 36px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 1px;
    transition: var(--transition-base);
    border: none;
    cursor: pointer;
}

.btn-tech-primary {
    background: var(--gradient-tech);
    color: var(--white);
    box-shadow: 0 4px 20px rgba(46, 134, 222, 0.3);
}

.btn-tech-primary:hover {
    box-shadow: 0 8px 30px rgba(46, 134, 222, 0.5);
    transform: translateY(-2px);
    color: var(--white);
}

.btn-tech-outline {
    background: transparent;
    color: var(--white);
    border: 1.5px solid rgba(255, 255, 255, 0.2);
}

.btn-tech-outline:hover {
    border-color: var(--cyan-glow);
    color: var(--cyan-glow);
    box-shadow: 0 0 20px rgba(0, 210, 255, 0.1);
}

/* Hero右侧装饰 */
.hero-visual {
    position: relative;
    z-index: 2;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

.hero-graphic {
    position: relative;
    width: 420px;
    height: 420px;
}

.hero-circle-outer {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 380px;
    height: 380px;
    border: 1px solid rgba(46, 134, 222, 0.15);
    border-radius: 50%;
    animation: rotate-slow 30s linear infinite;
}

.hero-circle-inner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 260px;
    height: 260px;
    border: 1px dashed rgba(0, 210, 255, 0.1);
    border-radius: 50%;
    animation: rotate-slow 20s linear infinite reverse;
}

@keyframes rotate-slow {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.hero-center-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 140px;
    height: 140px;
    background: var(--gradient-tech);
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 56px;
    color: var(--white);
    box-shadow: 0 0 60px rgba(46, 134, 222, 0.3);
}

.hero-float-card {
    position: absolute;
    background: rgba(18, 34, 64, 0.9);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(46, 134, 222, 0.15);
    border-radius: 12px;
    padding: 14px 18px;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    animation: float-y 4s ease-in-out infinite;
    white-space: nowrap;
}

.hero-float-card i {
    font-size: 18px;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.float-card-1 {
    top: 10%;
    right: -10%;
    animation-delay: 0s;
}

.float-card-1 i {
    background: rgba(46, 134, 222, 0.15);
    color: var(--tech-blue);
}

.float-card-2 {
    bottom: 20%;
    left: -15%;
    animation-delay: 1.5s;
}

.float-card-2 i {
    background: rgba(212, 168, 67, 0.15);
    color: var(--gold);
}

.float-card-3 {
    top: 55%;
    right: -20%;
    animation-delay: 3s;
}

.float-card-3 i {
    background: rgba(0, 210, 255, 0.15);
    color: var(--cyan-glow);
}

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

/* ===== 通用区块 ===== */
.section-padding {
    padding: 100px 0;
}

.section-dark {
    background: var(--deep-navy);
}

.section-darker {
    background: var(--steel-blue);
}

.section-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--cyan-glow);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.section-label::before {
    content: '';
    width: 24px;
    height: 2px;
    background: var(--gradient-tech);
    border-radius: 2px;
}

.section-title {
    font-size: clamp(28px, 3.5vw, 42px);
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
    line-height: 1.3;
}

.section-desc {
    font-size: 16px;
    color: var(--text-gray);
    max-width: 600px;
    line-height: 1.8;
}

/* ===== 关于铁旗 ===== */
.about-section {
    position: relative;
    overflow: hidden;
}

.about-section::before {
    content: '';
    position: absolute;
    top: -200px;
    right: -200px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(46, 134, 222, 0.06) 0%, transparent 60%);
    border-radius: 50%;
}

.about-highlight {
    background: rgba(46, 134, 222, 0.08);
    border-left: 3px solid var(--tech-blue);
    padding: 20px 24px;
    border-radius: 0 8px 8px 0;
    margin: 24px 0;
    font-size: 16px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.9);
}

.about-stats {
    display: flex;
    gap: 40px;
    margin-top: 30px;
}

.about-stat {
    text-align: left;
}

.about-stat-num {
    font-size: 36px;
    font-weight: 700;
    background: var(--gradient-tech);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.about-stat-label {
    font-size: 14px;
    color: var(--text-gray);
    margin-top: 4px;
}

.about-image-wrap {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
}

.about-image-placeholder {
    width: 100%;
    height: 420px;
    background: linear-gradient(135deg, var(--steel-blue) 0%, var(--card-dark) 100%);
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(46, 134, 222, 0.1);
    position: relative;
    overflow: hidden;
}

.about-image-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(46, 134, 222, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(46, 134, 222, 0.04) 1px, transparent 1px);
    background-size: 30px 30px;
}

.about-image-placeholder i {
    font-size: 64px;
    color: rgba(46, 134, 222, 0.2);
    margin-bottom: 16px;
}

.about-image-placeholder span {
    font-size: 14px;
    color: var(--text-gray);
}

.about-float-badge {
    position: absolute;
    bottom: 24px;
    right: 24px;
    background: rgba(10, 22, 40, 0.9);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(212, 168, 67, 0.2);
    border-radius: 12px;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.about-float-badge i {
    font-size: 24px;
    color: var(--gold);
}

.about-float-badge .badge-text {
    font-size: 12px;
    color: var(--text-gray);
}

.about-float-badge .badge-num {
    font-size: 22px;
    font-weight: 700;
    color: var(--gold);
}

/* ===== 三大品牌 ===== */
.brands-section {
    position: relative;
    overflow: hidden;
}

.brand-card {
    background: rgba(18, 34, 64, 0.6);
    border: 1px solid rgba(46, 134, 222, 0.1);
    border-radius: 16px;
    padding: 40px 30px;
    text-align: center;
    transition: var(--transition-base);
    height: 100%;
    position: relative;
    overflow: hidden;
}

.brand-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-tech);
    opacity: 0;
    transition: var(--transition-base);
}

.brand-card:hover {
    background: rgba(18, 34, 64, 0.9);
    border-color: rgba(46, 134, 222, 0.25);
    transform: translateY(-6px);
    box-shadow: var(--shadow-glow);
}

.brand-card:hover::before {
    opacity: 1;
}

.brand-card.gold-theme::before {
    background: var(--gradient-gold);
}

.brand-card.gold-theme:hover {
    border-color: rgba(212, 168, 67, 0.25);
    box-shadow: 0 0 30px rgba(212, 168, 67, 0.15);
}

.brand-card.cyan-theme::before {
    background: linear-gradient(135deg, #00D2FF 0%, #0EA5E9 100%);
}

.brand-card.cyan-theme:hover {
    border-color: rgba(0, 210, 255, 0.25);
    box-shadow: 0 0 30px rgba(0, 210, 255, 0.15);
}

.brand-icon-wrap {
    width: 72px;
    height: 72px;
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    margin: 0 auto 24px;
    position: relative;
}

.brand-icon-wrap.blue {
    background: rgba(46, 134, 222, 0.12);
    color: var(--tech-blue);
}

.brand-icon-wrap.gold {
    background: rgba(212, 168, 67, 0.12);
    color: var(--gold);
}

.brand-icon-wrap.cyan {
    background: rgba(0, 210, 255, 0.12);
    color: var(--cyan-glow);
}

.brand-card-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--white);
}

.brand-card-desc {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 20px;
}

.brand-tag {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 4px;
    font-size: 12px;
    margin: 3px;
    background: rgba(46, 134, 222, 0.08);
    color: var(--tech-blue);
    border: 1px solid rgba(46, 134, 222, 0.12);
}

.brand-tag.gold {
    background: rgba(212, 168, 67, 0.08);
    color: var(--gold);
    border-color: rgba(212, 168, 67, 0.12);
}

.brand-tag.cyan {
    background: rgba(0, 210, 255, 0.08);
    color: var(--cyan-glow);
    border-color: rgba(0, 210, 255, 0.12);
}

/* ===== 主营业务 ===== */
.services-section {
    position: relative;
    overflow: hidden;
}

.services-section::before {
    content: '';
    position: absolute;
    bottom: -200px;
    left: -200px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(0, 210, 255, 0.05) 0%, transparent 60%);
    border-radius: 50%;
}

.service-card {
    background: var(--card-dark);
    border: 1px solid rgba(46, 134, 222, 0.08);
    border-radius: 14px;
    padding: 32px 28px;
    transition: var(--transition-base);
    height: 100%;
    position: relative;
    overflow: hidden;
}

.service-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-tech);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.service-card:hover {
    border-color: rgba(46, 134, 222, 0.2);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

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

.service-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 20px;
    background: rgba(46, 134, 222, 0.1);
    color: var(--tech-blue);
}

.service-card:nth-child(2) .service-icon { background: rgba(0, 210, 255, 0.1); color: var(--cyan-glow); }
.service-card:nth-child(3) .service-icon { background: rgba(212, 168, 67, 0.1); color: var(--gold); }
.service-card:nth-child(4) .service-icon { background: rgba(16, 185, 129, 0.1); color: #10B981; }
.service-card:nth-child(5) .service-icon { background: rgba(236, 72, 153, 0.1); color: #EC4899; }
.service-card:nth-child(6) .service-icon { background: rgba(139, 92, 246, 0.1); color: #8B5CF6; }

.service-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 10px;
}

.service-desc {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.7;
    margin-bottom: 16px;
}

.service-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.service-tag {
    font-size: 11px;
    padding: 3px 10px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-gray);
    border: 1px solid rgba(255, 255, 255, 0.06);
}

/* ===== 发展历程 ===== */
.timeline-section {
    position: relative;
    overflow: hidden;
}

.timeline-line {
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, transparent, rgba(46, 134, 222, 0.3), rgba(46, 134, 222, 0.3), transparent);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    padding: 0 0 50px 0;
    display: flex;
    align-items: flex-start;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: 50%;
    top: 8px;
    width: 14px;
    height: 14px;
    background: var(--tech-blue);
    border: 3px solid var(--deep-navy);
    border-radius: 50%;
    transform: translateX(-50%);
    z-index: 2;
    box-shadow: 0 0 12px rgba(46, 134, 222, 0.4);
}

.timeline-dot.gold {
    background: var(--gold);
    box-shadow: 0 0 12px rgba(212, 168, 67, 0.4);
}

.timeline-content {
    width: 44%;
    background: rgba(18, 34, 64, 0.6);
    border: 1px solid rgba(46, 134, 222, 0.1);
    border-radius: 12px;
    padding: 20px 24px;
    transition: var(--transition-base);
}

.timeline-content:hover {
    border-color: rgba(46, 134, 222, 0.25);
    box-shadow: var(--shadow-glow);
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-right: auto;
    text-align: right;
}

.timeline-item:nth-child(even) .timeline-content {
    margin-left: auto;
}

.timeline-year {
    font-size: 24px;
    font-weight: 700;
    color: var(--cyan-glow);
    margin-bottom: 6px;
}

.timeline-item:nth-child(odd) .timeline-year {
    background: var(--gradient-tech);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.timeline-item:nth-child(even) .timeline-year {
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.timeline-text {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.7;
}

/* ===== 数据统计 ===== */
.stats-section {
    position: relative;
    background: linear-gradient(135deg, var(--steel-blue) 0%, #0D1F3C 100%);
    overflow: hidden;
}

.stats-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(46, 134, 222, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(46, 134, 222, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
}

.stat-item {
    text-align: center;
    padding: 30px 20px;
    position: relative;
}

.stat-item::after {
    content: '';
    position: absolute;
    right: 0;
    top: 20%;
    height: 60%;
    width: 1px;
    background: rgba(46, 134, 222, 0.15);
}

.stat-item:last-child::after {
    display: none;
}

.stat-number {
    font-size: clamp(36px, 4vw, 52px);
    font-weight: 700;
    background: var(--gradient-tech);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.stat-number.gold {
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 15px;
    color: var(--text-gray);
    margin-top: 8px;
    letter-spacing: 1px;
}

/* ===== 企业文化 ===== */
.culture-section {
    position: relative;
    overflow: hidden;
}

.culture-card {
    background: rgba(18, 34, 64, 0.5);
    border: 1px solid rgba(46, 134, 222, 0.1);
    border-radius: 16px;
    padding: 40px 30px;
    text-align: center;
    transition: var(--transition-base);
    height: 100%;
}

.culture-card:hover {
    border-color: rgba(46, 134, 222, 0.25);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.culture-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    margin: 0 auto 20px;
    background: rgba(46, 134, 222, 0.1);
    color: var(--tech-blue);
}

.culture-card:nth-child(2) .culture-icon {
    background: rgba(212, 168, 67, 0.1);
    color: var(--gold);
}

.culture-card:nth-child(3) .culture-icon {
    background: rgba(0, 210, 255, 0.1);
    color: var(--cyan-glow);
}

.culture-label {
    font-size: 13px;
    color: var(--text-gray);
    letter-spacing: 2px;
    margin-bottom: 10px;
}

.culture-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--white);
    line-height: 1.5;
}

/* ===== CTA区 ===== */
.cta-section {
    position: relative;
    background: linear-gradient(135deg, #0D2137 0%, #122A4E 50%, #0D2137 100%);
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse 50% 50% at 30% 50%, rgba(46, 134, 222, 0.1) 0%, transparent 60%),
        radial-gradient(ellipse 50% 50% at 70% 50%, rgba(212, 168, 67, 0.06) 0%, transparent 60%);
}

.cta-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta-title {
    font-size: clamp(26px, 3vw, 38px);
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.cta-desc {
    font-size: 16px;
    color: var(--text-gray);
    margin-bottom: 36px;
    line-height: 1.8;
}

.cta-contacts {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
    margin-top: 30px;
}

.cta-contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-gray);
    font-size: 15px;
}

.cta-contact-item i {
    font-size: 18px;
    color: var(--tech-blue);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(46, 134, 222, 0.1);
}

/* ===== Footer ===== */
.footer {
    background: #060E1A;
    padding: 60px 0 0;
    border-top: 1px solid rgba(46, 134, 222, 0.08);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-brand-icon {
    width: 36px;
    height: 36px;
    background: var(--gradient-tech);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 700;
    color: var(--white);
}

.footer-brand-name {
    font-size: 20px;
    font-weight: 700;
    color: var(--white);
    letter-spacing: 2px;
}

.footer-desc {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 20px;
    max-width: 320px;
}

.footer-social {
    display: flex;
    gap: 10px;
}

.footer-social a {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    border: 1px solid rgba(46, 134, 222, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-gray);
    font-size: 14px;
    transition: var(--transition-base);
}

.footer-social a:hover {
    border-color: var(--tech-blue);
    color: var(--tech-blue);
    background: rgba(46, 134, 222, 0.08);
}

.footer-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 12px;
}

.footer-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--gradient-tech);
    border-radius: 2px;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    font-size: 14px;
    color: var(--text-gray);
    transition: var(--transition-base);
    display: flex;
    align-items: center;
    gap: 6px;
}

.footer-links a::before {
    content: '';
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: rgba(46, 134, 222, 0.3);
    transition: var(--transition-base);
}

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

.footer-links a:hover::before {
    background: var(--cyan-glow);
}

.footer-contact-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 14px;
    font-size: 14px;
    color: var(--text-gray);
}

.footer-contact-item i {
    font-size: 14px;
    color: var(--tech-blue);
    margin-top: 4px;
    width: 16px;
    text-align: center;
}

.footer-bottom {
    border-top: 1px solid rgba(46, 134, 222, 0.08);
    padding: 20px 0;
    margin-top: 40px;
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(136, 150, 168, 0.6);
    margin: 0;
}

/* ===== 回到顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background: var(--gradient-tech);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 18px;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
    cursor: pointer;
    border: none;
    box-shadow: 0 4px 20px rgba(46, 134, 222, 0.3);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(46, 134, 222, 0.5);
}

/* ===== 滚动动画 ===== */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.fade-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.fade-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* ===== 响应式 ===== */
@media (max-width: 991px) {
    .hero-visual {
        display: none;
    }

    .hero-content {
        text-align: center;
        padding-top: 120px;
    }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-btns {
        justify-content: center;
    }

    .about-stats {
        justify-content: center;
    }

    .about-image-wrap {
        margin-top: 40px;
    }

    .timeline-line {
        left: 20px;
    }

    .timeline-dot {
        left: 20px;
    }

    .timeline-item:nth-child(odd) .timeline-content,
    .timeline-item:nth-child(even) .timeline-content {
        width: calc(100% - 50px);
        margin-left: 50px;
        text-align: left;
    }

    .stat-item::after {
        display: none;
    }
}

@media (max-width: 767px) {
    .section-padding {
        padding: 70px 0;
    }

    .top-bar {
        display: none;
    }

    .about-stats {
        flex-direction: column;
        gap: 20px;
    }

    .about-stat {
        text-align: center;
    }

    .cta-contacts {
        flex-direction: column;
        align-items: center;
        gap: 20px;
    }

    .hero-section {
        min-height: 85vh;
    }

    .hero-content {
        padding-top: 100px;
    }

    .footer {
        text-align: center;
    }

    .footer-desc {
        max-width: 100%;
    }

    .footer-social {
        justify-content: center;
    }

    .footer-title::after {
        left: 50%;
        transform: translateX(-50%);
    }
}

/* ===== 暗色滚动条 ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--deep-navy);
}

::-webkit-scrollbar-thumb {
    background: rgba(46, 134, 222, 0.3);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(46, 134, 222, 0.5);
}


/* ===== 客户案例 ===== */
.cases-section {
    position: relative;
    overflow: hidden;
    background: var(--steel-blue);
}

.cases-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.cases-tab {
    padding: 10px 28px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-base);
    border: 1.5px solid rgba(46, 134, 222, 0.15);
    background: rgba(18, 34, 64, 0.5);
    color: var(--text-gray);
    letter-spacing: 0.5px;
}

.cases-tab:hover {
    border-color: rgba(46, 134, 222, 0.35);
    color: var(--white);
}

.cases-tab.active {
    background: var(--gradient-tech);
    border-color: transparent;
    color: var(--white);
    box-shadow: 0 4px 16px rgba(46, 134, 222, 0.3);
}

.cases-tab i {
    margin-right: 6px;
}

.cases-panel {
    display: none;
}

.cases-panel.active {
    display: block;
    animation: fadeInPanel 0.4s ease;
}

@keyframes fadeInPanel {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: 16px;
}

.case-item {
    background: rgba(10, 22, 40, 0.6);
    border: 1px solid rgba(46, 134, 222, 0.08);
    border-radius: 10px;
    padding: 20px 16px;
    text-align: center;
    transition: var(--transition-base);
    cursor: default;
    position: relative;
    overflow: hidden;
}

.case-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-tech);
    opacity: 0;
    transition: var(--transition-base);
}

.case-item:hover {
    border-color: rgba(46, 134, 222, 0.25);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.case-item:hover::before {
    opacity: 1;
}

.case-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
    font-size: 20px;
    background: rgba(46, 134, 222, 0.1);
    color: var(--tech-blue);
}

.case-item:nth-child(even) .case-icon {
    background: rgba(0, 210, 255, 0.1);
    color: var(--cyan-glow);
}

.case-item:nth-child(3n) .case-icon {
    background: rgba(212, 168, 67, 0.1);
    color: var(--gold);
}

.case-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 4px;
}

.case-tag {
    font-size: 11px;
    color: var(--text-gray);
}

/* 高德案例无具体客户时 */
.case-empty-hint {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-gray);
    font-size: 15px;
}

.case-empty-hint i {
    font-size: 32px;
    color: rgba(46, 134, 222, 0.2);
    margin-bottom: 12px;
    display: block;
}

@media (max-width: 767px) {
    .case-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 12px;
    }

    .cases-tab {
        padding: 8px 18px;
        font-size: 13px;
    }
}