:root {
    --bg-primary: #ffffff;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --accent: #65a8ff;
    --accent-secondary: #0c1a9c;
    --accent-tertiary: #87ceeb;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: rgba(43, 125, 233, 0.15);
    --border-glow: rgba(0, 119, 255, 0.3);
    --radius: 16px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

.bg-grid {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: 
        radial-gradient(ellipse at 20% 80%, rgba(43, 125, 233, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(91, 184, 232, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(135, 206, 235, 0.04) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

#particleCanvas {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    z-index: 1;
}

.scan-line {
    display: none;
}

.navbar {
    position: fixed;
    top: 0; left: 0; width: 100%;
    z-index: 100;
    border-bottom: 1px solid rgba(43, 125, 233, 0.08);
    backdrop-filter: blur(20px) saturate(180%);
    background: rgba(255, 255, 255, 0.7);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px 0 8px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: 1px;
    color: var(--text-primary);
}

.logo img {
    width: 32px; height: 32px;
    border-radius: 8px;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px; left: 50%;
    transform: translateX(-50%);
    width: 0; height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-secondary));
    border-radius: 3px;
    transition: width 0.3s ease;
}

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

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

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    z-index: 10;
    padding: 120px 24px 80px;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    width: 100%;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    border: 1px solid var(--border);
    background: linear-gradient(135deg, rgba(43, 125, 233, 0.08), rgba(91, 184, 232, 0.08));
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 24px;
    border-radius: 50px;
    box-shadow: 0 0 20px rgba(43, 125, 233, 0.1);
}

.badge-dot {
    width: 8px; height: 8px;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    border-radius: 50%;
    animation: pulse 3s infinite;
    box-shadow: 0 0 10px rgba(43, 125, 233, 0.5);
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(0.8); }
}




.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -1px;
    position: relative;
    filter: drop-shadow(0 0 60px rgba(43, 125, 233, 0.3));
}

.title-line:not(.accent) {
    font-size: 1.8rem;
    color: var(--text-primary);
    display: block;
    animation: fadeInUp 0.8s ease-out both;
    position: relative;
}

.title-line:nth-child(1) {
    animation-delay: 0.2s;
}

.title-line:nth-child(2) {
    animation-delay: 0.4s;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.title-line.accent {
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary), var(--accent-tertiary), var(--accent));
    background-size: 300% 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 8s ease-in-out infinite, textGlow 6s ease-in-out infinite;
    filter: drop-shadow(0 0 20px rgba(0, 100, 200, 0.5));
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

@keyframes textGlow {
    0%, 100% { filter: drop-shadow(0 0 20px rgba(0, 80, 180, 0.5)) drop-shadow(0 0 50px rgba(0, 150, 220, 0.3)) drop-shadow(0 0 80px rgba(255, 255, 255, 0.2)); }
    10% { filter: drop-shadow(0 0 40px rgba(95, 165, 252, 0.7)) drop-shadow(0 0 80px rgba(0, 150, 220, 0.5)) drop-shadow(0 0 120px rgba(255, 255, 255, 0.35)); }
}

.title-line.accent::after {
    content: '联信交友';
    position: absolute;
    left: 0; top: 10px;
    background: linear-gradient(90deg, transparent 0%, rgba(0, 174, 255, 0.8) 50%, transparent 100%);
    background-size: 200% 100%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmer 6s ease-in-out infinite;
    pointer-events: none;
    filter: drop-shadow(0 0 10px rgba(0, 132, 255, 0.8));
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.hero-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 480px;
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 50px;
    font-family: inherit;
}

.btn-icon {
    width: 18px; height: 18px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    color: #fff;
    box-shadow: 0 4px 20px rgba(43, 125, 233, 0.3), 0 0 40px rgba(43, 125, 233, 0.15);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(43, 125, 233, 0.4), 0 0 60px rgba(43, 125, 233, 0.25);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(43, 125, 233, 0.05);
    box-shadow: 0 0 20px rgba(43, 125, 233, 0.1);
}


.version-info {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-muted);
    animation: fadeInUp 0.8s ease-out 0.8s both;
}

.version-tag {
    padding: 2px 8px;
    background: linear-gradient(135deg, rgba(43, 125, 233, 0.1), rgba(91, 184, 232, 0.1));
    color: var(--accent);
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.75rem;
    border-radius: 6px;
}

.version-separator {
    color: var(--text-muted);
}

.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 400px;
}

.icon-frame {
    position: relative;
    z-index: 10;
}

.frame-glow {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 160%; height: 160%;
    background: radial-gradient(circle, rgba(43, 125, 233, 0.4) 0%, rgba(91, 184, 232, 0.25) 30%, transparent 70%);
    animation: glow-pulse 6s ease-in-out infinite;
    filter: blur(20px);
}

@keyframes glow-pulse {
    0%, 100% { opacity: 0.6; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 1; transform: translate(-50%, -50%) scale(1.15); }
}

.app-icon {
    width: 180px; height: 180px;
    border-radius: 24px;
    position: relative;
    z-index: 10;
    box-shadow: 0 20px 60px rgba(43, 125, 233, 0.2), 0 0 0 1px rgba(255, 255, 255, 0.5) inset;
    animation: iconFloat 8s ease-in-out infinite, iconFadeIn 1s ease-out 0.5s both;
    cursor: pointer;
    transition: opacity 0.3s ease;
}

.intro-video-mask {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: 2147483646;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    pointer-events: none;
    cursor: pointer;
}

.intro-video-mask.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

/* 视频显示时，隐藏导航栏和底部的毛玻璃效果避免层叠冲突 */
body.video-open .navbar,
body.video-open .footer {
    visibility: hidden;
}

.intro-video-mask.active {
    opacity: 1;
    visibility: visible;
}

.intro-video-wrap {
    position: fixed;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%) scale(0.8);
    z-index: 2147483647;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
    pointer-events: none;
    padding-bottom: 56px;
}

.intro-video-wrap.active {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
    pointer-events: auto;
}

.intro-video-wrap.active {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.intro-close-btn {
    position: absolute;
    top: -16px;
    right: -16px;
    width: 40px;
    height: 40px;
    font-size: 1.6rem;
    line-height: 1;
    color: #fff;
    background: rgba(43, 125, 233, 0.9);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    pointer-events: auto;
    z-index: 2147483647;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s, transform 0.2s;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.intro-close-btn:hover {
    background: rgba(43, 125, 233, 1);
    transform: scale(1.1);
}

.intro-video {
    display: block;
    max-width: 90vw;
    max-height: 85vh;
    width: auto;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
}

.intro-unmute-btn {
    position: absolute;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    padding: 10px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    color: #fff;
    background: rgba(43, 125, 233, 0.9);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    pointer-events: auto;
    transition: background 0.2s, opacity 0.3s;
    white-space: nowrap;
}

.intro-unmute-btn:hover {
    background: rgba(43, 125, 233, 1);
}

.intro-unmute-btn.hidden {
    opacity: 0;
    pointer-events: none;
}

@keyframes iconFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-10px) rotate(2deg); }
}

@keyframes iconFadeIn {
    from { opacity: 0; transform: scale(0.9) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.orbit-ring, .orbit-ring-2 {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
}

.orbit-ring {
    width: 300px; height: 300px;
    border: 1px solid rgba(43, 125, 233, 0.15);
    animation: orbit 20s linear infinite;
    box-shadow: 0 0 30px rgba(43, 125, 233, 0.1);
}

.orbit-ring-2 {
    width: 380px; height: 380px;
    border: 1px solid rgba(91, 184, 232, 0.12);
    animation: orbit 30s linear infinite reverse;
    box-shadow: 0 0 40px rgba(91, 184, 232, 0.1);
}

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

.scroll-indicator {
    position: absolute;
    bottom: 40px; left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--accent), transparent);
    animation: scroll-bounce 2s infinite;
}

@keyframes scroll-bounce {
    0%, 100% { opacity: 0.3; transform: translateY(0); }
    50% { opacity: 1; transform: translateY(10px); }
}

.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 10;
}

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

.section-label {
    display: inline-block;
    padding: 4px 12px;
    border: 1px solid var(--border);
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 16px;
    border-radius: 50px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.video-section {
    padding: 120px 0;
    position: relative;
    z-index: 10;
}

.video-frame {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    border: 1px solid var(--border);
    background: var(--bg-card);
    padding: 8px;
    border-radius: var(--radius);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
}

.video-frame-border {
    position: absolute;
    top: -1px; left: -1px; right: -1px; bottom: -1px;
    pointer-events: none;
}

.video-frame-corner {
    position: absolute;
    width: 20px; height: 20px;
    border: 2px solid var(--accent);
}

.video-frame-corner.tl { top: 0; left: 0; border-right: none; border-bottom: none; }
.video-frame-corner.tr { top: 0; right: 0; border-left: none; border-bottom: none; }
.video-frame-corner.bl { bottom: 0; left: 0; border-right: none; border-top: none; }
.video-frame-corner.br { bottom: 0; right: 0; border-left: none; border-top: none; }

.video-frame video {
    width: 100%;
    display: block;
    border-radius: 12px;
    background: #000;
}

.download-section {
    padding: 120px 0;
    position: relative;
    z-index: 10;
}

.download-card {
    position: relative;
    max-width: 700px;
    margin: 0 auto;
    border: 1px solid var(--border);
    background: var(--bg-card);
    padding: 48px;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.06), 0 0 0 1px rgba(255, 255, 255, 0.8) inset;
}

.card-glow {
    position: absolute;
    top: -50%; left: -50%;
    width: 200%; height: 200%;
    background: radial-gradient(circle at 50% 50%, rgba(43, 125, 233, 0.06), transparent 60%);
    pointer-events: none;
}

.download-content {
    display: flex;
    align-items: center;
    gap: 32px;
    position: relative;
    z-index: 1;
    flex-wrap: wrap;
    justify-content: center;
    text-align: center;
}

.download-icon img {
    width: 80px; height: 80px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(43, 125, 233, 0.15);
}

.download-info h3 {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.download-meta {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.download-features {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.feature-tag {
    padding: 4px 12px;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.75rem;
    border-radius: 50px;
}

.btn-download {
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    color: #fff;
    font-size: 1.1rem;
    padding: 16px 36px;
    box-shadow: 0 4px 20px rgba(43, 125, 233, 0.3), 0 0 40px rgba(43, 125, 233, 0.15);
    border-radius: 50px;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(43, 125, 233, 0.4), 0 0 60px rgba(43, 125, 233, 0.25);
}

.install-guide {
    margin-top: 40px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
    position: relative;
    z-index: 1;
}

.install-guide h4 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.install-guide ol {
    list-style: none;
    counter-reset: step;
}

.install-guide li {
    position: relative;
    padding-left: 40px;
    margin-bottom: 12px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

.install-guide li::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 0; top: 0;
    width: 24px; height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 700;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    border-radius: 6px;
}

.footer {
    border-top: 1px solid var(--border);
    padding: 40px 24px;
    position: relative;
    z-index: 10;
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    color: var(--text-primary);
}

.footer-brand img {
    width: 28px; height: 28px;
    border-radius: 8px;
}

.footer-copy {
    color: var(--text-muted);
    font-size: 0.8rem;
}

@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 60px;
        text-align: center;
    }

    .hero-title {
        font-size: 2.5rem;
    }

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

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

    .version-info {
        justify-content: center;
    }

    .hero-visual {
        height: 300px;
    }

    .app-icon {
        width: 140px; height: 140px;
    }

    .orbit-ring {
        width: 240px; height: 240px;
    }

    .orbit-ring-2 {
        width: 300px; height: 300px;
    }

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

    .download-content {
        flex-direction: column;
    }

    .download-card {
        padding: 32px 24px;
    }

    .nav-links {
        gap: 20px;
    }

    .footer-container {
        flex-direction: column;
        text-align: center;
    }
}

/* Password Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    background: rgba(13, 18, 30, 0.95);
    border: 1px solid rgba(43, 125, 233, 0.2);
    border-radius: 16px;
    padding: 32px;
    width: 90%;
    max-width: 420px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), 0 0 30px rgba(43, 125, 233, 0.1);
    transform: translateY(20px);
    transition: transform 0.3s ease;
    position: relative;
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
    position: relative;
}

.modal-header h3 {
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    position: absolute;
    right: 0;
    top: 0;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
    padding: 0;
    transition: color 0.2s;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    margin-bottom: 24px;
}

.modal-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 20px;
}

.modal-input {
    width: 100%;
    padding: 12px 16px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(43, 125, 233, 0.2);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    box-sizing: border-box;
}

.modal-input:focus {
    border-color: rgba(43, 125, 233, 0.5);
    box-shadow: 0 0 0 3px rgba(43, 125, 233, 0.1);
}

.modal-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.modal-error {
    color: #ff6b6b;
    font-size: 0.85rem;
    margin-top: 10px;
    min-height: 1.2em;
    display: none;
}

.modal-error.active {
    display: block;
}

.modal-footer {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.btn-secondary {
    padding: 10px 20px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

/* ===== 从 index.html 内联 <style> 迁移 ===== */

/* 禁止文字选中，但保留输入框可用 */
body {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}
input, textarea {
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    user-select: text;
}
/* 禁止图片拖拽 */
img {
    -webkit-user-drag: none;
    pointer-events: none;
}
/* APP图标需要接收鼠标悬停事件 */
#appIcon {
    pointer-events: auto;
}
/* 底部备案号链接与正文统一风格（继承颜色、无下划线） */
.footer-copy a {
    color: inherit;
    text-decoration: none;
}

/* ===== 工具类：替代内联 style 属性 ===== */
.link-inherit {
    color: inherit;
    text-decoration: none;
}
.footer-centered {
    justify-content: center;
}
.text-center {
    text-align: center;
}
.beian-icon {
    width: 14px;
    height: 14px;
    vertical-align: middle;
    margin-right: 4px;
}