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

:root {
    --primary-blue: #0066ff;
    --secondary-blue: #0099ff;
    --dark-blue: #0a1628;
    --darker-blue: #050d18;
    --cyan: #00d4ff;
    --accent: #00ffcc;
    --text-light: #e0e6ed;
    --text-muted: #94a3b8;
    --gradient-start: #0066ff;
    --gradient-end: #00d4ff;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--darker-blue);
    color: var(--text-light);
    line-height: 1.6;
    overflow-x: hidden;
}

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

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(5, 13, 24, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 153, 255, 0.1);
    padding: 15px 0;
    transition: all 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.nav-logo {
    height: 40px;
    width: auto;
    border-radius: 6px;
}

.nav-brand .logo {
    font-size: 28px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-blue), var(--cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 2px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-link {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-blue), var(--cyan));
    transition: width 0.3s ease;
}

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

.nav-link:hover,
.nav-link.active {
    color: var(--cyan);
}

.nav-pricing {
    background: linear-gradient(135deg, #ffd700, #ffaa00);
    color: #050d18 !important;
    padding: 8px 20px;
    border-radius: 20px;
    font-weight: 600;
}

.nav-pricing:hover {
    background: linear-gradient(135deg, #ffc107, #ff9800);
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(255, 215, 0, 0.4);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 12px;
    z-index: 1001;
    position: relative;
}

.mobile-menu-btn span {
    width: 25px;
    height: 2px;
    background: var(--text-light);
    transition: all 0.3s ease;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.hero-video {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    object-fit: cover;
    opacity: 0.5;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(5, 13, 24, 0.7) 0%, rgba(5, 13, 24, 0.9) 100%);
}

.grid-lines {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(0, 153, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 153, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translateY(0); }
    100% { transform: translateY(50px); }
}

.particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--cyan);
    border-radius: 50%;
    opacity: 0.5;
    animation: float 15s infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) translateX(0); opacity: 0; }
    10% { opacity: 0.5; }
    90% { opacity: 0.5; }
    100% { transform: translateY(-100vh) translateX(20px); opacity: 0; }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-blue), var(--cyan), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 3s ease infinite;
    background-size: 200% 200%;
}

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

.hero-subtitle {
    font-size: 24px;
    color: var(--cyan);
    margin-bottom: 20px;
    font-weight: 600;
}

.hero-description {
    font-size: 18px;
    color: var(--text-muted);
    margin-bottom: 40px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 60px;
}

.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 16px;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    color: white;
    box-shadow: 0 10px 30px rgba(0, 102, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(0, 102, 255, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    color: white;
    border: none;
    box-shadow: 0 10px 30px rgba(0, 102, 255, 0.3);
}

.btn-secondary:hover {
    background: linear-gradient(135deg, #0088ee, #0055bb);
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(0, 102, 255, 0.4);
}

.btn-download {
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    color: white;
    border: none;
    display: flex;
    align-items: center;
    box-shadow: 0 10px 30px rgba(0, 102, 255, 0.3);
}

.btn-download:hover {
    background: linear-gradient(135deg, #0088ee, #0055bb);
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(0, 102, 255, 0.4);
}

.btn-pricing {
    background: linear-gradient(135deg, #ffd700, #ffaa00);
    color: #050d18;
    border: none;
    display: flex;
    align-items: center;
    font-weight: 600;
    box-shadow: 0 10px 30px rgba(255, 215, 0, 0.3);
}

.btn-pricing:hover {
    background: linear-gradient(135deg, #ffc107, #ff9800);
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(255, 215, 0, 0.4);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 80px;
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: 48px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-blue), var(--cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 8px;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
}

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

@keyframes scrollBounce {
    0%, 100% { transform: translateY(0); opacity: 1; }
    50% { transform: translateY(10px); opacity: 0.5; }
}

section {
    padding: 100px 0;
}

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

.section-title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--text-light), var(--cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-muted);
}

.features {
    background: linear-gradient(180deg, var(--darker-blue), var(--dark-blue));
}

.feature-section {
    margin-top: 4rem;
    padding: 2rem;
    background: rgba(0, 153, 255, 0.03);
    border-radius: 12px;
    border: 1px solid rgba(0, 153, 255, 0.1);
}

.feature-section:first-child {
    margin-top: 3rem;
}

.feature-section-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #0099ff;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
}

.feature-section-desc {
    font-size: 1rem;
    color: #888;
    margin-bottom: 2rem;
    line-height: 1.5;
}

.feature-card h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 0.8rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.feature-card {
    background: rgba(10, 22, 40, 0.6);
    border: 1px solid rgba(0, 153, 255, 0.1);
    border-radius: 16px;
    padding: 35px;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-blue), var(--cyan));
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-10px);
    border-color: rgba(0, 153, 255, 0.3);
    box-shadow: 0 20px 50px rgba(0, 102, 255, 0.15);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.2), rgba(0, 212, 255, 0.1));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.feature-icon svg {
    width: 30px;
    height: 30px;
    color: var(--cyan);
}

.feature-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-light);
}

.feature-desc {
    font-size: 15px;
    color: var(--text-muted);
    line-height: 1.7;
}

.tech {
    background: var(--dark-blue);
}

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

.tech-architecture {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.arch-layer {
    background: rgba(10, 22, 40, 0.8);
    border: 1px solid rgba(0, 153, 255, 0.15);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s ease;
}

.arch-layer:hover {
    border-color: rgba(0, 153, 255, 0.4);
}



.arch-layer-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--cyan);
    margin-bottom: 12px;
}

.arch-items {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.arch-item {
    background: rgba(0, 102, 255, 0.1);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-light);
}

.tech-benefits {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.benefit-item {
    background: rgba(10, 22, 40, 0.8);
    border: 1px solid rgba(0, 153, 255, 0.15);
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    transition: all 0.3s ease;
}

.benefit-item:hover {
    transform: translateY(-5px);
    border-color: rgba(0, 153, 255, 0.4);
}

.benefit-icon {
    font-size: 40px;
    margin-bottom: 15px;
}

.benefit-item h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-light);
}

.benefit-item p {
    font-size: 13px;
    color: var(--text-muted);
}

.performance {
    background: linear-gradient(180deg, var(--dark-blue), var(--darker-blue));
}

.performance-table {
    overflow-x: auto;
}

.performance-table table {
    width: 100%;
    border-collapse: collapse;
    background: rgba(10, 22, 40, 0.6);
    border-radius: 16px;
    overflow: hidden;
}

.performance-table th,
.performance-table td {
    padding: 20px;
    text-align: left;
    border-bottom: 1px solid rgba(0, 153, 255, 0.1);
}

.performance-table th {
    background: rgba(0, 102, 255, 0.1);
    font-weight: 600;
    color: var(--cyan);
    font-size: 15px;
}

.performance-table td {
    color: var(--text-light);
    font-size: 15px;
}

.performance-table .highlight {
    color: var(--accent);
    font-weight: 600;
}

.performance-table tbody tr:last-child td {
    border-bottom: none;
}

.performance-table tbody tr:hover {
    background: rgba(0, 153, 255, 0.05);
}

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

.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.doc-card {
    background: rgba(10, 22, 40, 0.6);
    border: 1px solid rgba(0, 153, 255, 0.1);
    border-radius: 16px;
    padding: 30px;
    text-decoration: none;
    transition: all 0.3s ease;
    display: block;
}

.doc-card:hover {
    transform: translateY(-8px);
    border-color: rgba(0, 153, 255, 0.3);
    box-shadow: 0 15px 40px rgba(0, 102, 255, 0.15);
}

.doc-icon {
    font-size: 40px;
    margin-bottom: 15px;
}

.doc-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-light);
}

.doc-desc {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 15px;
    line-height: 1.6;
}

.doc-action {
    color: var(--cyan);
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.doc-card:hover .doc-action {
    color: var(--accent);
}

.contact {
    background: linear-gradient(180deg, var(--darker-blue), var(--dark-blue));
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.info-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.info-icon {
    font-size: 32px;
    flex-shrink: 0;
}

.info-text h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--text-light);
}

.info-text p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
}

.qr-code-section {
    margin-top: 20px;
    display: flex;
    justify-content: center;
}

.qr-code-wrapper {
    background: rgba(10, 22, 40, 0.6);
    border: 1px solid rgba(0, 153, 255, 0.1);
    border-radius: 16px;
    padding: 25px;
    text-align: center;
    transition: all 0.3s ease;
}

.qr-code-wrapper:hover {
    border-color: rgba(0, 153, 255, 0.3);
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 102, 255, 0.15);
}

.qr-code {
    width: 180px;
    height: 180px;
    border-radius: 12px;
    margin-bottom: 12px;
}

.qr-code-label {
    font-size: 14px;
    color: var(--text-light);
    font-weight: 500;
}

.contact-form {
    background: rgba(10, 22, 40, 0.6);
    border: 1px solid rgba(0, 153, 255, 0.1);
    border-radius: 16px;
    padding: 35px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    background: rgba(5, 13, 24, 0.8);
    border: 1px solid rgba(0, 153, 255, 0.2);
    border-radius: 8px;
    color: var(--text-light);
    font-size: 15px;
    transition: all 0.3s ease;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--cyan);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.1);
}

.footer {
    background: var(--darker-blue);
    border-top: 1px solid rgba(0, 153, 255, 0.1);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand .logo {
    font-size: 32px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-blue), var(--cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}

.footer-brand p {
    color: var(--text-muted);
    font-size: 14px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.footer-column h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-light);
}

.footer-column ul {
    list-style: none;
}

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

.footer-column ul li a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s ease;
}

.footer-column ul li a:hover {
    color: var(--cyan);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(0, 153, 255, 0.1);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 13px;
}

.footer-bottom {
    position: relative;
}

.admin-toggle-btn {
    position: absolute;
    right: 20px;
    bottom: 50%;
    transform: translateY(50%);
    background: none;
    border: none;
    font-size: 16px;
    cursor: pointer;
    opacity: 0.3;
    transition: all 0.3s ease;
    padding: 5px;
}

.admin-toggle-btn:hover {
    opacity: 1;
    transform: translateY(50%) scale(1.2);
}

.beian-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 13px;
    transition: all 0.3s ease;
}

.beian-link:hover {
    color: var(--cyan);
}

.beian-icon {
    height: 14px;
    width: auto;
    vertical-align: middle;
    display: inline-block;
}

@media (max-width: 968px) {
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(5, 13, 24, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid rgba(0, 153, 255, 0.2);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: 1000;
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-menu li {
        margin: 10px 0;
    }

    .nav-menu li a {
        font-size: 18px;
        padding: 10px 20px;
        display: block;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero-video {
        opacity: 0.6;
    }

    .video-overlay {
        background: linear-gradient(135deg, rgba(5, 13, 24, 0.7) 0%, rgba(5, 13, 24, 0.85) 100%);
    }

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

    .hero-subtitle {
        font-size: 18px;
    }

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

    .tech-benefits {
        grid-template-columns: 1fr;
    }

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

    .hero-stats {
        gap: 40px;
    }

    .stat-number {
        font-size: 36px;
    }

    .section-title {
        font-size: 32px;
    }

    .qr-code {
        width: 150px;
        height: 150px;
    }

    .nav-brand {
        gap: 8px;
    }

    .nav-logo {
        height: 32px;
    }

    .admin-toggle-btn {
        right: 10px;
    }
}

@media (max-width: 640px) {
    .hero-video {
        opacity: 0.7;
    }

    .video-overlay {
        background: linear-gradient(135deg, rgba(5, 13, 24, 0.6) 0%, rgba(5, 13, 24, 0.8) 100%);
    }

    .hero-title {
        font-size: 28px;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 15px;
    }

    .btn-download {
        justify-content: center;
    }

    .feature-section {
        padding: 1.5rem;
    }

    .feature-section-title {
        font-size: 1.3rem;
    }

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

    .hero-stats {
        flex-direction: column;
        gap: 30px;
    }

    .qr-code {
        width: 120px;
        height: 120px;
    }

    .nav-logo {
        height: 28px;
    }

    .nav-brand .logo {
        font-size: 22px;
    }
}

.admin-panel {
    position: fixed;
    top: 0;
    right: -450px;
    width: 450px;
    height: 100vh;
    background: rgba(10, 22, 40, 0.98);
    backdrop-filter: blur(20px);
    border-left: 1px solid rgba(0, 153, 255, 0.2);
    z-index: 9999;
    transition: right 0.3s ease;
    display: flex;
    flex-direction: column;
}

.admin-panel.active {
    right: 0;
}

.admin-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid rgba(0, 153, 255, 0.1);
}

.admin-panel-header h3 {
    color: var(--cyan);
    font-size: 18px;
    font-weight: 600;
}

.admin-close-btn {
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 24px;
    cursor: pointer;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.admin-close-btn:hover {
    background: rgba(0, 153, 255, 0.1);
    color: var(--cyan);
}

.admin-panel-content {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.admin-count {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 15px;
}

.submissions-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.no-submissions {
    color: var(--text-muted);
    text-align: center;
    padding: 40px 0;
}

.submission-item {
    background: rgba(0, 102, 255, 0.05);
    border: 1px solid rgba(0, 153, 255, 0.1);
    border-radius: 12px;
    padding: 15px;
    transition: all 0.3s ease;
}

.submission-item:hover {
    border-color: rgba(0, 153, 255, 0.3);
    background: rgba(0, 102, 255, 0.1);
}

.submission-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.submission-date {
    color: var(--text-muted);
    font-size: 12px;
}

.delete-btn {
    background: rgba(255, 80, 80, 0.1);
    color: #ff5050;
    border: 1px solid rgba(255, 80, 80, 0.2);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.delete-btn:hover {
    background: rgba(255, 80, 80, 0.2);
}

.submission-content p {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 8px;
    line-height: 1.6;
}

.submission-content strong {
    color: var(--cyan);
}

.submission-message {
    background: rgba(5, 13, 24, 0.5);
    padding: 10px;
    border-radius: 8px;
    margin-top: 5px !important;
}

.back-to-top {
    position: fixed;
    right: 30px;
    bottom: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 999;
    box-shadow: 0 5px 20px rgba(0, 102, 255, 0.3);
}

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

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 102, 255, 0.4);
}

.back-to-top svg {
    width: 22px;
    height: 22px;
    color: white;
}

@media (max-width: 640px) {
    .admin-panel {
        width: 100%;
        right: -100%;
    }
    
    .back-to-top {
        right: 20px;
        bottom: 20px;
        width: 45px;
        height: 45px;
    }
}