/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #00f2ff;
    --secondary-color: #7928ca;
    --accent-color: #ff0080;
    --bg-dark: #0a0a0a;
    --bg-darker: #050505;
    --text-light: #ffffff;
    --text-gray: #a0a0a0;
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-cyber: linear-gradient(135deg, #00f2ff 0%, #7928ca 50%, #ff0080 100%);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.6;
    overflow-x: hidden;
}

html {
    scroll-behavior: smooth;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 粒子背景 */
#particles-js {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
    background: var(--bg-dark);
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all 0.3s ease;
    border-bottom: 1px solid rgba(0, 242, 255, 0.1);
}

.navbar.scrolled {
    box-shadow: 0 5px 30px rgba(0, 242, 255, 0.2);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand {
    font-size: 1.8rem;
    font-weight: bold;
    background: var(--gradient-cyber);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--text-light);
    text-decoration: none;
    font-size: 1rem;
    position: relative;
    transition: color 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-cyber);
    transition: width 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-color);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    transition: all 0.3s ease;
}

/* 首页区域 */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
    padding: 100px 20px 50px;
}

.hero-content h1 {
    font-size: 5rem;
    margin-bottom: 1rem;
    background: var(--gradient-cyber);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 1s ease;
}

/* 故障效果 */
.glitch {
    position: relative;
}

.glitch::before,
.glitch::after {
    content: attr(data-text);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.glitch::before {
    left: 2px;
    text-shadow: -2px 0 #ff0080;
    clip: rect(44px, 450px, 56px, 0);
    animation: glitch-anim 5s infinite linear alternate-reverse;
}

.glitch::after {
    left: -2px;
    text-shadow: -2px 0 #00f2ff;
    clip: rect(44px, 450px, 56px, 0);
    animation: glitch-anim 5s infinite linear alternate-reverse;
    animation-delay: 2s;
}

@keyframes glitch-anim {
    0% {
        clip: rect(10px, 9999px, 31px, 0);
    }
    20% {
        clip: rect(70px, 9999px, 71px, 0);
    }
    40% {
        clip: rect(64px, 9999px, 29px, 0);
    }
    60% {
        clip: rect(96px, 9999px, 42px, 0);
    }
    80% {
        clip: rect(40px, 9999px, 80px, 0);
    }
    100% {
        clip: rect(31px, 9999px, 92px, 0);
    }
}

.subtitle {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    animation: fadeInUp 1s ease 0.2s both;
}

.description {
    font-size: 1.2rem;
    color: var(--text-gray);
    margin-bottom: 2rem;
    animation: fadeInUp 1s ease 0.4s both;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    animation: fadeInUp 1s ease 0.6s both;
}

.btn {
    padding: 12px 35px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--gradient-cyber);
    color: white;
    box-shadow: 0 5px 20px rgba(0, 242, 255, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 242, 255, 0.6);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--bg-dark);
    transform: translateY(-3px);
}

.btn-block {
    width: 100%;
}

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.mouse {
    width: 25px;
    height: 40px;
    border: 2px solid var(--primary-color);
    border-radius: 15px;
    position: relative;
}

.wheel {
    width: 3px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0%, 20% {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
    100% {
        transform: translateX(-50%) translateY(15px);
        opacity: 0;
    }
}

.arrow {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.arrow span {
    width: 10px;
    height: 10px;
    border-bottom: 2px solid var(--primary-color);
    border-right: 2px solid var(--primary-color);
    transform: rotate(45deg);
    animation: arrowMove 2s infinite;
}

.arrow span:nth-child(2) {
    animation-delay: 0.2s;
}

@keyframes arrowMove {
    0%, 100% {
        opacity: 0;
        transform: rotate(45deg) translate(-10px, -10px);
    }
    50% {
        opacity: 1;
        transform: rotate(45deg) translate(0, 0);
    }
}

@keyframes auroraShift {
    0% {
        transform: translate3d(-6%, -4%, 0) scale(1.05);
    }
    50% {
        transform: translate3d(6%, 5%, 0) scale(1.1);
    }
    100% {
        transform: translate3d(-6%, -4%, 0) scale(1.05);
    }
}

@keyframes auroraShiftReverse {
    0% {
        transform: translate3d(6%, -5%, 0) scale(1.05);
    }
    50% {
        transform: translate3d(-5%, 6%, 0) scale(1.12);
    }
    100% {
        transform: translate3d(6%, -5%, 0) scale(1.05);
    }
}

@keyframes gridDrift {
    0% {
        background-position: 0 0, 0 0;
    }
    50% {
        background-position: 80px 80px, -80px -80px;
    }
    100% {
        background-position: 0 0, 0 0;
    }
}

/* 通用区域样式 */
section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 3rem;
    margin-bottom: 20px;
    background: var(--gradient-cyber);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-line {
    width: 100px;
    height: 4px;
    background: var(--gradient-cyber);
    margin: 0 auto 20px;
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-gray);
}

/* 关于区域 */
.about {
    background: linear-gradient(180deg, rgba(8, 8, 20, 0.98) 0%, rgba(4, 4, 12, 1) 60%, rgba(3, 3, 8, 1) 100%);
    position: relative;
    overflow: hidden;
    z-index: 0;
}

.about::before {
    content: '';
    position: absolute;
    inset: -20% 0 -10% 0;
    background:
        radial-gradient(600px circle at 15% 20%, rgba(0, 242, 255, 0.16) 0%, transparent 60%),
        radial-gradient(500px circle at 85% 10%, rgba(255, 0, 128, 0.18) 0%, transparent 55%),
        radial-gradient(800px circle at 50% 90%, rgba(121, 40, 202, 0.14) 0%, transparent 70%);
    filter: blur(0.5px);
    z-index: -2;
    animation: auroraShift 22s ease-in-out infinite;
    pointer-events: none;
    will-change: transform;
}

.about::after,
.services::after,
.contact::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        repeating-linear-gradient(0deg, rgba(0, 242, 255, 0.06) 0, rgba(0, 242, 255, 0.06) 1px, transparent 1px, transparent 80px),
        repeating-linear-gradient(90deg, rgba(255, 0, 128, 0.05) 0, rgba(255, 0, 128, 0.05) 1px, transparent 1px, transparent 80px);
    opacity: 0.45;
    z-index: -1;
    mix-blend-mode: screen;
    pointer-events: none;
    animation: gridDrift 30s linear infinite;
    will-change: background-position;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    align-items: center;
}

.about-image {
    position: relative;
}

.image-placeholder {
    width: 100%;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.logo-container {
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
    position: relative;
    animation: float 3s ease-in-out infinite;
}

.logo-image {
    width: 100%;
    height: auto;
    display: block;
    filter: drop-shadow(0 0 30px rgba(0, 242, 255, 0.6));
    transition: transform 0.3s ease, filter 0.3s ease;
}

.logo-image:hover {
    transform: scale(1.05);
    filter: drop-shadow(0 0 50px rgba(0, 242, 255, 0.8));
}

/* 保留 avatar 样式以防需要 */
.avatar-circle {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    background: var(--gradient-cyber);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    animation: float 3s ease-in-out infinite;
    box-shadow: 0 0 50px rgba(0, 242, 255, 0.5);
}

.avatar-circle::before {
    content: '';
    position: absolute;
    width: 280px;
    height: 280px;
    border-radius: 50%;
    border: 2px solid var(--primary-color);
    animation: rotate 10s linear infinite;
}

.avatar-text {
    font-size: 4rem;
    font-weight: bold;
    color: white;
}

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

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

.about-text h3 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.about-text p {
    margin-bottom: 15px;
    color: var(--text-gray);
    font-size: 1.1rem;
    line-height: 1.8;
}

.highlight {
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.3rem;
}

/* 技能条 */
.skills {
    margin-top: 40px;
}

.skill-item {
    margin-bottom: 25px;
}

.skill-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    color: var(--text-light);
}

.skill-bar {
    height: 10px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 5px;
    overflow: hidden;
    position: relative;
}

.skill-progress {
    height: 100%;
    background: var(--gradient-cyber);
    border-radius: 5px;
    position: relative;
    animation: progressAnim 2s ease;
    box-shadow: 0 0 20px rgba(0, 242, 255, 0.5);
}

@keyframes progressAnim {
    from {
        width: 0;
    }
}

/* 服务区域 */
.services {
    background: linear-gradient(185deg, rgba(6, 6, 18, 1) 0%, rgba(3, 3, 12, 1) 55%, rgba(2, 2, 8, 1) 100%);
    position: relative;
    overflow: hidden;
    z-index: 0;
}

.services::before {
    content: '';
    position: absolute;
    inset: -25% 0 -15% 0;
    background:
        radial-gradient(700px circle at 10% 35%, rgba(0, 242, 255, 0.14) 0%, transparent 60%),
        radial-gradient(600px circle at 80% 25%, rgba(121, 40, 202, 0.18) 0%, transparent 65%),
        radial-gradient(900px circle at 50% 110%, rgba(255, 0, 128, 0.12) 0%, transparent 70%);
    z-index: -2;
    pointer-events: none;
    animation: auroraShiftReverse 26s ease-in-out infinite;
    will-change: transform;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-bottom: 80px;
}

.service-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(0, 242, 255, 0.2);
    border-radius: 15px;
    padding: 40px 30px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-cyber);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.service-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 40px rgba(0, 242, 255, 0.3);
}

.service-card:hover::before {
    opacity: 0.1;
}

.card-icon {
    width: 80px;
    height: 80px;
    margin-bottom: 25px;
    color: var(--primary-color);
}

.card-icon svg {
    width: 100%;
    height: 100%;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-light);
}

.service-card > p {
    color: var(--text-gray);
    margin-bottom: 20px;
    line-height: 1.8;
}

.service-features {
    list-style: none;
    padding: 0;
}

.service-features li {
    color: var(--text-gray);
    margin-bottom: 10px;
    padding-left: 25px;
    position: relative;
}

.service-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* 技术能力 */
.tech-skills {
    padding: 60px 0 0;
    border-top: 1px solid rgba(0, 242, 255, 0.2);
}

.tech-category-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 50px;
    background: var(--gradient-cyber);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tech-category {
    margin-bottom: 50px;
}

.tech-subtitle {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 30px;
    text-align: center;
    position: relative;
}

.tech-subtitle::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gradient-cyber);
    border-radius: 2px;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    padding: 25px 15px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(0, 242, 255, 0.2);
    border-radius: 12px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.tech-item:hover {
    transform: translateY(-8px);
    border-color: var(--primary-color);
    background: rgba(0, 242, 255, 0.05);
    box-shadow: 0 10px 30px rgba(0, 242, 255, 0.3);
}

.tech-icon {
    width: 50px;
    height: 50px;
    color: var(--primary-color);
    transition: all 0.3s ease;
}

.tech-item:hover .tech-icon {
    color: var(--accent-color);
    transform: scale(1.2) rotate(5deg);
}

.tech-icon svg {
    width: 100%;
    height: 100%;
}

.tech-item span {
    font-size: 0.95rem;
    color: var(--text-light);
    font-weight: 500;
    text-align: center;
}

/* 统计数据（保留以防需要）*/
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    padding: 60px 0;
    border-top: 1px solid rgba(0, 242, 255, 0.2);
}

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

.stat-number {
    font-size: 3.5rem;
    font-weight: bold;
    background: var(--gradient-cyber);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}

.stat-label {
    font-size: 1.1rem;
    color: var(--text-gray);
}

/* 联系区域 */
.contact {
    background: linear-gradient(180deg, rgba(4, 4, 12, 1) 0%, rgba(2, 2, 8, 1) 55%, rgba(1, 1, 5, 1) 100%);
    position: relative;
    overflow: hidden;
    z-index: 0;
}

.contact::before {
    content: '';
    position: absolute;
    inset: -15% 0 -10% 0;
    background:
        radial-gradient(580px circle at 20% 30%, rgba(0, 242, 255, 0.15) 0%, transparent 60%),
        radial-gradient(540px circle at 85% 40%, rgba(255, 0, 128, 0.15) 0%, transparent 65%),
        radial-gradient(720px circle at 50% 100%, rgba(121, 40, 202, 0.18) 0%, transparent 70%);
    z-index: -2;
    pointer-events: none;
    animation: auroraShift 24s ease-in-out infinite;
    will-change: transform;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.contact-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    padding: 40px 25px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(0, 242, 255, 0.2);
    border-radius: 15px;
    transition: all 0.3s ease;
    text-align: center;
}

.contact-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0, 242, 255, 0.3);
    background: rgba(0, 242, 255, 0.05);
}

.contact-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 6px;
}

.contact-value {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-light);
    letter-spacing: 0.5px;
}

.copy-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 999px;
    border: 1px solid rgba(0, 242, 255, 0.4);
    background: rgba(0, 242, 255, 0.08);
    color: var(--text-light);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.copy-btn svg {
    width: 18px;
    height: 18px;
}

.copy-btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(0, 242, 255, 0.15);
    transform: translate(-50%, -50%);
    border-radius: 50%;
    transition: width 0.4s ease, height 0.4s ease;
}

.copy-btn:hover::after,
.copy-btn:focus-visible::after {
    width: 180px;
    height: 180px;
}

.copy-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    box-shadow: 0 8px 25px rgba(0, 242, 255, 0.25);
}

.copy-btn:focus-visible {
    outline: 2px solid rgba(0, 242, 255, 0.6);
    outline-offset: 3px;
}

.copy-btn.copied {
    background: rgba(0, 242, 255, 0.18);
    border-color: rgba(0, 242, 255, 0.7);
    color: var(--text-light);
    box-shadow: 0 10px 30px rgba(0, 242, 255, 0.35);
}

.copy-btn.copy-error {
    background: rgba(255, 0, 128, 0.18);
    border-color: rgba(255, 0, 128, 0.6);
    color: var(--text-light);
    box-shadow: 0 10px 30px rgba(255, 0, 128, 0.35);
}

.copy-btn span {
    position: relative;
    z-index: 1;
}

.contact-link {
    color: var(--primary-color);
    font-size: 1.2rem;
    font-weight: 600;
    text-decoration: none;
    letter-spacing: 0.5px;
    transition: color 0.3s ease;
}

.contact-link:hover,
.contact-link:focus-visible {
    color: var(--accent-color);
}

.contact-link:focus-visible {
    outline: 2px solid rgba(0, 242, 255, 0.6);
    outline-offset: 3px;
}

.contact-icon {
    width: 60px;
    height: 60px;
    color: var(--primary-color);
    transition: all 0.3s ease;
}

.contact-item:hover .contact-icon {
    color: var(--accent-color);
    transform: scale(1.2) rotate(10deg);
}

.contact-icon svg {
    width: 100%;
    height: 100%;
}

.contact-details h4 {
    font-size: 1.3rem;
    margin-bottom: 8px;
    color: var(--text-light);
}

/* 服务时间 */
.service-time {
    text-align: center;
    padding: 50px 40px;
    background: rgba(255, 255, 255, 0.03);
    border: 2px solid rgba(0, 242, 255, 0.3);
    border-radius: 20px;
    position: relative;
    overflow: hidden;
    max-width: 600px;
    margin: 0 auto;
}

.service-time::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-cyber);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.service-time:hover::before {
    opacity: 0.1;
}

.service-time:hover {
    border-color: var(--primary-color);
    box-shadow: 0 10px 40px rgba(0, 242, 255, 0.4);
    transform: translateY(-5px);
}

.time-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    color: var(--primary-color);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.1);
    }
}

.time-icon svg {
    width: 100%;
    height: 100%;
}

.service-time h3 {
    font-size: 2rem;
    margin-bottom: 20px;
    background: var(--gradient-cyber);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.time-text {
    font-size: 1.8rem;
    color: var(--primary-color);
    font-weight: bold;
    margin-bottom: 10px;
    letter-spacing: 1px;
}

.time-note {
    font-size: 1.1rem;
    color: var(--text-gray);
}

/* 页脚 */
.footer {
    background: var(--bg-darker);
    padding: 30px 0;
    border-top: 1px solid rgba(0, 242, 255, 0.2);
}

.footer-content {
    text-align: center;
}

.footer-content p {
    color: var(--text-gray);
    margin-bottom: 5px;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-cyber);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
    box-shadow: 0 5px 20px rgba(0, 242, 255, 0.4);
}

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

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 242, 255, 0.6);
}

.back-to-top svg {
    width: 24px;
    height: 24px;
}

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

/* 响应式设计 */
@media (max-width: 968px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: rgba(10, 10, 10, 0.98);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        padding: 2rem 0;
        border-top: 1px solid rgba(0, 242, 255, 0.2);
    }

    .nav-menu.active {
        left: 0;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }

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

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .hero-content h1 {
        font-size: 3rem;
    }

    .subtitle {
        font-size: 1.5rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .logo-container {
        max-width: 250px;
    }

    .avatar-circle {
        width: 200px;
        height: 200px;
    }

    .avatar-circle::before {
        width: 230px;
        height: 230px;
    }

    .tech-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: 20px;
    }

    .tech-item {
        padding: 20px 10px;
    }

    .tech-icon {
        width: 40px;
        height: 40px;
    }

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

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

    .contact-info {
        gap: 10px;
    }

    .copy-btn {
        width: 100%;
        justify-content: center;
    }

    .service-time {
        padding: 40px 25px;
    }

    .time-icon {
        width: 60px;
        height: 60px;
    }

    .service-time h3 {
        font-size: 1.5rem;
    }

    .time-text {
        font-size: 1.4rem;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
        padding: 0 20px;
    }

    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }

    .nav-brand {
        font-size: 1.5rem;
    }

    .stat-number {
        font-size: 2.5rem;
    }

    .avatar-text {
        font-size: 3rem;
    }

    .tech-category-title {
        font-size: 2rem;
    }

    .tech-subtitle {
        font-size: 1.2rem;
    }

    .tech-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 15px;
    }

    .tech-item {
        padding: 15px 8px;
    }

    .tech-icon {
        width: 35px;
        height: 35px;
    }

    .tech-item span {
        font-size: 0.85rem;
    }

    .service-time {
        padding: 30px 20px;
    }

    .time-icon {
        width: 50px;
        height: 50px;
    }

    .service-time h3 {
        font-size: 1.3rem;
    }

    .time-text {
        font-size: 1.2rem;
    }

    .time-note {
        font-size: 0.95rem;
    }

    .contact-value,
    .contact-link {
        font-size: 1.05rem;
    }

    .copy-btn {
        font-size: 0.9rem;
        padding: 8px 14px;
    }
}