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

:root {
    --primary: #00f0ff;
    --secondary: #ff00a0;
    --accent: #ffd700;
    --bg-dark: #0a0a0f;
    --bg-card: #111118;
    --bg-elevated: #1a1a24;
    --text-primary: #e0e0e0;
    --text-secondary: #888899;
    --border: #222233;
    --success: #00ff88;
    --danger: #ff4444;
    --warning: #ffaa00;
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

/* ========== 粒子背景 ========== */
#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ========== 导航栏 ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: #111118;
    border-bottom: 1px solid #222233;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.logo-text {
    font-family: 'Orbitron', sans-serif;
    font-size: 24px;
    font-weight: 900;
    color: var(--primary);
    text-shadow: 0 0 20px rgba(0, 240, 255, 0.5);
}

.logo-sub {
    font-size: 14px;
    color: var(--text-secondary);
    margin-left: 8px;
    padding-left: 8px;
    border-left: 2px solid var(--border);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 15px;
    transition: all 0.3s;
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--primary), #0088ff);
    color: #000 !important;
    padding: 8px 24px;
    border-radius: 6px;
    font-weight: bold;
}

.mobile-menu {
    display: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--primary);
}

/* ========== 英雄区 ========== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 100px 20px 60px;
    position: relative;
    z-index: 1;
    gap: 60px;
    max-width: 1400px;
    margin: 0 auto;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-badge {
    display: inline-block;
    background: linear-gradient(135deg, rgba(255, 0, 160, 0.2), rgba(255, 0, 160, 0.1));
    border: 1px solid var(--secondary);
    color: var(--secondary);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    margin-bottom: 24px;
}

.hero-title {
    font-size: 52px;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 20px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 50px;
}

.btn-glow {
    background: linear-gradient(135deg, var(--primary), #0088ff);
    color: #000;
    padding: 14px 36px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: bold;
    box-shadow: 0 0 30px rgba(0, 240, 255, 0.3);
    transition: all 0.3s;
    display: inline-block;
}

.btn-glow:hover {
    box-shadow: 0 0 50px rgba(0, 240, 255, 0.5);
    transform: translateY(-2px);
}

.btn-outline {
    border: 2px solid var(--primary);
    color: var(--primary);
    padding: 14px 36px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: bold;
    transition: all 0.3s;
    display: inline-block;
}

.btn-outline:hover {
    background: var(--primary);
    color: #000;
}

.hero-stats {
    display: flex;
    gap: 40px;
}

.stat {
    text-align: center;
}

.stat-num {
    display: block;
    font-size: 36px;
    font-weight: 900;
    color: var(--primary);
    font-family: 'Orbitron', sans-serif;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ========== 软件界面展示 ========== */
.hero-showcase {
    flex: 1;
    max-width: 600px;
    perspective: 1000px;
}

.screen-mockup {
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border);
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), 0 0 40px rgba(0, 240, 255, 0.1);
    transform: rotateY(-5deg) rotateX(5deg);
    transition: transform 0.5s;
}

.screen-mockup:hover {
    transform: rotateY(0deg) rotateX(0deg);
}

.screen-header {
    background: var(--bg-elevated);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid var(--border);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27c93f; }

.screen-title {
    margin-left: 10px;
    font-size: 12px;
    color: var(--text-secondary);
}

.screen-body {
    padding: 16px;
    font-size: 12px;
}

.mock-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.mock-status.green {
    color: var(--success);
}

.mock-btn {
    background: var(--bg-elevated);
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 11px;
    color: var(--text-secondary);
}

.mock-platforms {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    margin-bottom: 12px;
}

.plat {
    background: var(--bg-elevated);
    padding: 6px;
    text-align: center;
    border-radius: 4px;
    font-size: 11px;
    border: 1px solid var(--border);
}

.mock-controls {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.ctrl-btn {
    flex: 1;
    padding: 8px;
    text-align: center;
    border-radius: 6px;
    font-size: 12px;
    font-weight: bold;
}

.ctrl-btn.start {
    background: linear-gradient(135deg, #00aa44, #00ff88);
    color: #000;
}

.ctrl-btn.stop {
    background: linear-gradient(135deg, #cc0000, #ff4444);
    color: #fff;
}

.ctrl-btn.photo {
    background: linear-gradient(135deg, #0088ff, #00f0ff);
    color: #000;
}

.mock-info {
    background: var(--bg-elevated);
    padding: 10px;
    border-radius: 6px;
    margin-bottom: 12px;
}

.info-line {
    display: flex;
    justify-content: space-between;
    padding: 4px 0;
    font-size: 11px;
}

.info-line .highlight {
    color: var(--primary);
}

.mock-issues {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
}

.issue {
    padding: 4px 6px;
    text-align: center;
    border-radius: 4px;
    font-size: 10px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
}

.issue:nth-child(1) { color: #ff6b6b; }
.issue:nth-child(2) { color: #ffaa00; }
.issue:nth-child(3) { color: #ffd700; }
.issue:nth-child(4) { color: #00ff88; }
.issue:nth-child(5) { color: #00f0ff; }
.issue:nth-child(6) { color: #0088ff; }
.issue:nth-child(7) { color: #aa66ff; }
.issue:nth-child(8) { color: #ff66aa; }
.issue:nth-child(9) { color: #ff8888; }

/* ========== 功能特性 ========== */
.features {
    padding: 100px 20px;
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
}

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

.section-tag {
    display: inline-block;
    font-family: 'Orbitron', sans-serif;
    font-size: 13px;
    color: var(--primary);
    letter-spacing: 3px;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 40px;
    font-weight: 900;
    margin-bottom: 16px;
}

.section-header p {
    font-size: 18px;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 40px 30px;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    opacity: 0;
    transition: opacity 0.3s;
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary);
    box-shadow: 0 20px 40px rgba(0, 240, 255, 0.1);
}

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

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 22px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
}

/* ========== 截图展示 ========== */
.screenshots {
    padding: 100px 20px;
    position: relative;
    z-index: 1;
    background: linear-gradient(180deg, transparent, rgba(0, 240, 255, 0.03), transparent);
}

.screenshot-showcase {
    max-width: 900px;
    margin: 0 auto;
}

.screenshot-main {
    perspective: 1200px;
}

.screenshot-frame {
    background: var(--bg-card);
    border-radius: 16px;
    border: 1px solid var(--border);
    overflow: hidden;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
}

.frame-header {
    background: var(--bg-elevated);
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border);
}

.frame-dot {
    width: 14px;
    height: 14px;
    background: var(--primary);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--primary);
}

.frame-title {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.frame-content {
    padding: 24px;
    font-size: 13px;
}

.mock-top {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.mock-logo {
    font-size: 28px;
}

.mock-brand {
    font-size: 20px;
    font-weight: bold;
    color: var(--primary);
    flex: 1;
}

.mock-time {
    color: var(--text-secondary);
    font-size: 12px;
}

.mock-obs {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding: 10px 16px;
    background: var(--bg-elevated);
    border-radius: 8px;
}

.obs-status {
    color: var(--success);
    font-weight: bold;
}

.obs-link {
    background: #333;
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 12px;
}

.mock-complete {
    text-align: center;
    padding: 20px;
    background: linear-gradient(135deg, rgba(0, 255, 136, 0.1), rgba(0, 255, 136, 0.05));
    border: 1px solid rgba(0, 255, 136, 0.2);
    border-radius: 8px;
    margin-bottom: 16px;
}

.complete-text {
    font-size: 24px;
    font-weight: bold;
    color: var(--success);
}

.complete-sub {
    color: var(--text-secondary);
    margin-top: 4px;
}

.mock-stats {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 16px;
    padding: 12px;
    background: var(--bg-elevated);
    border-radius: 8px;
}

.mock-stats b {
    color: var(--primary);
    font-size: 18px;
}

.mock-prev {
    background: var(--bg-elevated);
    padding: 16px;
    border-radius: 8px;
    margin-bottom: 16px;
}

.prev-title {
    font-weight: bold;
    margin-bottom: 10px;
    color: var(--primary);
}

.prev-row {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    border-bottom: 1px solid var(--border);
}

.prev-row .file {
    color: var(--primary);
    font-size: 12px;
}

.mock-log {
    background: var(--bg-elevated);
    padding: 16px;
    border-radius: 8px;
    font-family: 'Consolas', monospace;
}

.log-title {
    font-weight: bold;
    margin-bottom: 10px;
    color: var(--accent);
}

.log-line {
    padding: 4px 0;
    font-size: 12px;
    color: var(--text-secondary);
}

/* ========== 价格套餐 ========== */
.pricing {
    padding: 100px 20px;
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.pricing-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 40px 30px;
    position: relative;
    transition: all 0.3s;
}

.pricing-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary);
}

.pricing-card.popular {
    border-color: var(--secondary);
    box-shadow: 0 0 40px rgba(255, 0, 160, 0.1);
}

.popular-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--secondary), #ff0066);
    color: #fff;
    padding: 6px 24px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: bold;
}

.pricing-header {
    text-align: center;
    margin-bottom: 30px;
}

.pricing-header h3 {
    font-size: 24px;
    margin-bottom: 16px;
}

.pricing-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.currency {
    font-size: 24px;
    color: var(--primary);
}

.amount {
    font-size: 56px;
    font-weight: 900;
    color: var(--primary);
    font-family: 'Orbitron', sans-serif;
}

.period {
    font-size: 18px;
    color: var(--text-secondary);
}

.pricing-features {
    margin-bottom: 30px;
}

.pf-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    font-size: 15px;
}

.pf-item:last-child {
    border-bottom: none;
}

.check {
    color: var(--success);
    font-weight: bold;
}

.pricing-btn {
    display: block;
    text-align: center;
    padding: 14px;
    border-radius: 10px;
    background: var(--bg-elevated);
    border: 2px solid var(--primary);
    color: var(--primary);
    font-size: 16px;
    font-weight: bold;
    transition: all 0.3s;
}

.pricing-btn:hover {
    background: var(--primary);
    color: #000;
}

.btn-popular {
    background: linear-gradient(135deg, var(--secondary), #ff0066);
    border: none;
    color: #fff;
}

.btn-popular:hover {
    background: linear-gradient(135deg, #ff0066, var(--secondary));
    color: #fff;
    box-shadow: 0 0 30px rgba(255, 0, 160, 0.3);
}

/* ========== 下载区 ========== */
.download {
    padding: 100px 20px;
    position: relative;
    z-index: 1;
    background: linear-gradient(180deg, transparent, rgba(0, 240, 255, 0.03));
    text-align: center;
}

.download-area {
    max-width: 500px;
    margin: 0 auto;
}

.download-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 50px 40px;
}

.download-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.download-card h3 {
    font-size: 24px;
    margin-bottom: 16px;
}

.download-card p {
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-size: 14px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--primary), #0088ff);
    color: #000;
    padding: 16px 40px;
    border-radius: 10px;
    font-size: 18px;
    font-weight: bold;
    margin: 24px 0;
    box-shadow: 0 0 30px rgba(0, 240, 255, 0.3);
    transition: all 0.3s;
}

.download-btn:hover {
    box-shadow: 0 0 50px rgba(0, 240, 255, 0.5);
    transform: translateY(-2px);
}

.download-note {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 16px;
}

/* ========== 页脚 ========== */
.footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    padding: 60px 20px 20px;
    position: relative;
    z-index: 1;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand .logo-text {
    font-size: 28px;
}

.footer-brand p {
    color: var(--text-secondary);
    margin-top: 10px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.link-group h4 {
    color: var(--text-primary);
    margin-bottom: 16px;
    font-size: 16px;
}

.link-group a {
    display: block;
    color: var(--text-secondary);
    padding: 6px 0;
    font-size: 14px;
    transition: color 0.3s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 13px;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .nav-links {
        display: flex;
        gap: 8px;
        overflow-x: auto;
        white-space: nowrap;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        flex-shrink: 0;
    }
    .nav-links::-webkit-scrollbar {
        display: none;
    }
    .nav-links a {
        font-size: 12px;
        padding: 2px 6px;
    }

    .mobile-menu {
        display: none !important;
    }

    .nav-container {
        padding: 0 8px;
        height: 55px;
        gap: 8px;
    }
    .logo-text {
        font-size: 16px;
    }
    .logo-sub {
        display: none;
    }
    .logo img {
        width: 32px;
        height: 32px;
    }

    .hero {
        flex-direction: column;
        padding-top: 80px;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-buttons {
        flex-direction: column;
    }

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

    .screen-mockup {
        transform: none;
    }

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

    .footer-links {
        grid-template-columns: 1fr;
    }

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

/* ========== 动画 ========== */
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 20px rgba(0, 240, 255, 0.2); }
    50% { box-shadow: 0 0 40px rgba(0, 240, 255, 0.4); }
}

/* ========== 二维码展示 ========== */
.footer-qr {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.qr-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.qr-item img {
    border: 2px solid var(--border);
    transition: all 0.3s;
}

.qr-item img:hover {
    border-color: var(--primary);
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.2);
}

.qr-item span {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Logo适配 */
.logo img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--primary);
    box-shadow: 0 0 15px rgba(0, 240, 255, 0.3);
}

/* 下载区logo */
.download-icon img {
    border: 3px solid var(--primary);
    box-shadow: 0 0 30px rgba(0, 240, 255, 0.3);
    transition: all 0.3s;
}

.download-icon img:hover {
    box-shadow: 0 0 50px rgba(0, 240, 255, 0.5);
    transform: scale(1.05);
}

/* 截图区logo */
.mock-logo img {
    border: 2px solid var(--primary);
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
}

/* 页脚品牌 */
.footer-brand {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
}

.footer-brand .logo-text {
    font-size: 28px;
    display: inline-block;
}

/* ========== 回到顶部按钮 ========== */
.back-to-top {
    position: fixed;
    right: 24px;
    bottom: 28px;
    z-index: 9999;
    width: 52px;
    height: 52px;
    padding: 0;
    border: none;
    background: transparent;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(22px) scale(0.88);
    transition: opacity 0.35s ease, transform 0.35s ease, visibility 0.35s;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.back-to-top__ring {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: conic-gradient(from 0deg, var(--primary), #bf00ff, var(--secondary), var(--success), var(--primary));
    animation: backToTopSpin 3.5s linear infinite;
    box-shadow: 0 0 18px rgba(0, 240, 255, 0.35);
}

.back-to-top__ring::after {
    content: '';
    position: absolute;
    inset: 2px;
    border-radius: 50%;
    background: var(--bg-dark);
}

.back-to-top__inner {
    position: absolute;
    inset: 3px;
    border-radius: 50%;
    background: rgba(13, 13, 22, 0.94);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow:
        0 0 22px rgba(0, 240, 255, 0.18),
        inset 0 0 14px rgba(0, 240, 255, 0.06);
    transition: box-shadow 0.3s ease, transform 0.25s ease;
}

.back-to-top__icon {
    width: 22px;
    height: 22px;
    color: var(--primary);
    filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.65));
    transition: transform 0.3s ease, color 0.3s ease;
}

.back-to-top.show .back-to-top__inner {
    animation: backToTopPulse 2.4s ease-in-out infinite;
}

.back-to-top:hover .back-to-top__inner {
    box-shadow:
        0 0 32px rgba(191, 0, 255, 0.45),
        inset 0 0 18px rgba(0, 240, 255, 0.12);
    transform: translateY(-3px);
}

.back-to-top:hover .back-to-top__icon {
    transform: translateY(-2px);
    color: #fff;
}

.back-to-top:active .back-to-top__inner {
    transform: translateY(0) scale(0.94);
}

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

@keyframes backToTopPulse {
    0%, 100% { box-shadow: 0 0 22px rgba(0, 240, 255, 0.18), inset 0 0 14px rgba(0, 240, 255, 0.06); }
    50% { box-shadow: 0 0 30px rgba(191, 0, 255, 0.32), inset 0 0 18px rgba(0, 240, 255, 0.1); }
}

@media (max-width: 768px) {
    .back-to-top {
        right: 16px;
        bottom: 20px;
        width: 44px;
        height: 44px;
    }

    .back-to-top__icon {
        width: 18px;
        height: 18px;
    }
}