/* ================================
   Reset & Base Styles
   ================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0066ff;
    --primary-light: #4d94ff;
    --primary-dark: #0052cc;
    --secondary-color: #00c6ff;
    --accent-blue: #0088ff;
    --text-primary: #1a1a2e;
    --text-secondary: #4a5568;
    --text-light: #718096;
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-gray: #f1f5f9;
    --border-light: #e2e8f0;
    --shadow-light: 0 4px 20px rgba(0, 102, 255, 0.08);
    --shadow-medium: 0 8px 30px rgba(0, 102, 255, 0.12);
    --shadow-hover: 0 12px 40px rgba(0, 102, 255, 0.18);
}

html {
    scroll-behavior: smooth;
}

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

/* ================================
   Tech Background Pattern
   ================================ */
.tech-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background:
        linear-gradient(135deg, rgba(0, 102, 255, 0.03) 0%, transparent 50%),
        linear-gradient(-135deg, rgba(0, 198, 255, 0.03) 0%, transparent 50%);
}

.circuit-pattern {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(0, 102, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 102, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
}

.hidden-seo-text {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    font-size: 1px;
    color: #ffffff;
    letter-spacing: 1px;
    line-height: 1px;
    overflow: hidden;
    z-index: 0;
    pointer-events: none;
    word-wrap: break-word;
    opacity: 0.01;
    user-select: none;
}

/* ================================
   Navigation
   ================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 102, 255, 0.08);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-light);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-img {
    height: 45px;
    width: auto;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
    transition: color 0.3s ease;
}

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

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

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

.nav-icons {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background: rgba(0, 102, 255, 0.05);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.nav-icon:hover {
    background: rgba(0, 102, 255, 0.1);
    color: var(--primary-color);
}

.nav-mail-link {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.5rem 1rem !important;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.1), rgba(0, 198, 255, 0.1));
    border: 1px solid rgba(0, 102, 255, 0.2);
    border-radius: 8px;
    color: var(--primary-color) !important;
    font-weight: 600 !important;
    transition: all 0.3s ease;
}

.nav-mail-link:hover {
    background: linear-gradient(135deg, #0066ff, #00c6ff);
    color: white !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 102, 255, 0.3);
}

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

.hamburger span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
    border-radius: 2px;
}

/* ================================
   Hero Section
   ================================ */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 100px 2rem 4rem;
    position: relative;
    background:
        linear-gradient(180deg, rgba(0, 102, 255, 0.02) 0%, transparent 50%),
        var(--bg-white);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 60%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><path d="M0,50 L20,30 L40,50 L60,20 L80,40 L100,10" stroke="%230066ff" stroke-width="0.3" fill="none" opacity="0.1"/><path d="M0,70 L30,40 L50,60 L70,30 L100,50" stroke="%2300c6ff" stroke-width="0.3" fill="none" opacity="0.1"/></svg>');
    background-size: cover;
    opacity: 0.5;
}

.hero-content {
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    min-height: 60vh;
}

.hero-visual-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.25rem;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.1), rgba(0, 198, 255, 0.1));
    border: 1px solid rgba(0, 102, 255, 0.2);
    border-radius: 50px;
    color: var(--primary-color);
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    margin-bottom: 1rem;
}

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

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: 2rem;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.btn {
    position: relative;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    overflow: hidden;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-blue));
    color: white;
    box-shadow: 0 4px 15px rgba(0, 102, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 102, 255, 0.4);
}

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

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

.hero-visual-center {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    width: 100%;
    max-width: 1000px;
}

.shield-container {
    position: relative;
    width: 500px;
    height: 400px;
    margin-bottom: 2rem;
}

/* Simplified Floating Icons */
.floating-icon {
    position: absolute;
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.95);
    border: 2px solid rgba(0, 102, 255, 0.15);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 1.5rem;
    box-shadow: 0 8px 25px rgba(0, 102, 255, 0.1);
    animation: float-icon 8s ease-in-out infinite;
    z-index: 5;
}

.floating-icon.icon-1 {
    top: 5%;
    left: -50px;
    animation-delay: 0s;
}
.floating-icon.icon-2 {
    top: 25%;
    right: -30px;
    animation-delay: 2s;
}

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

/* Simple Shield Wave */
.shield-wave-simple {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 300px;
    border-radius: 50%;
    border: 2px solid rgba(0, 102, 255, 0.1);
    animation: wave-expand 4s ease-out infinite;
}

.shield-wave-simple::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 380px;
    height: 380px;
    border-radius: 50%;
    border: 1px solid rgba(0, 102, 255, 0.08);
    animation: wave-expand 4s ease-out infinite 1s;
}

@keyframes wave-expand {
    0% { transform: translate(-50%, -50%) scale(0.8); opacity: 1; }
    100% { transform: translate(-50%, -50%) scale(1.3); opacity: 0; }
}

/* Hero Text Content - Centered below shield */
.hero-text-content {
    text-align: center;
    z-index: 10;
}

.hero-main-title {
    font-size: 4rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
    line-height: 1.1;
    letter-spacing: 2px;
}

.hero-tagline {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 500;
    flex-wrap: wrap;
}

.tagline-item {
    padding: 0.5rem 0;
}

.tagline-divider {
    color: var(--primary-color);
    opacity: 0.5;
}

/* Background Lines */
.bg-line {
    position: absolute;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0, 102, 255, 0.15), transparent);
    z-index: 0;
}

.bg-line-1 {
    top: 30%;
    right: 0;
    width: 40%;
    transform: rotate(-15deg);
}

.bg-line-2 {
    bottom: 25%;
    left: 0;
    width: 35%;
    transform: rotate(10deg);
}

.shield-3d {
    position: absolute;
    width: 200px;
    height: 240px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 3;
}

.shield-body {
    width: 100%;
    height: 100%;
    background: transparent;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.shield-inner {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.shield-icon {
    width: 300px;
    height: 300px;
    filter: drop-shadow(0 15px 40px rgba(74, 152, 193, 0.25));
}

.shield-ring {
    position: absolute;
    border: 2px solid;
    border-radius: 50%;
    animation: rotate 20s linear infinite;
}

.ring-1 {
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    border-color: rgba(0, 102, 255, 0.1);
    border-width: 3px;
}

.ring-2 {
    width: 80%;
    height: 80%;
    top: 10%;
    left: 10%;
    border-color: rgba(0, 198, 255, 0.2);
    animation-direction: reverse;
    animation-duration: 15s;
}

.ring-3 {
    width: 60%;
    height: 60%;
    top: 20%;
    left: 20%;
    border-color: rgba(0, 102, 255, 0.15);
    animation-duration: 12s;
}

.base-platform {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    width: 280px;
    height: 80px;
    background: linear-gradient(180deg, #e8f0fe, #d0e1ff);
    border-radius: 20px;
    box-shadow:
        0 20px 60px rgba(0, 102, 255, 0.2),
        inset 0 2px 10px rgba(255, 255, 255, 0.8);
    z-index: 2;
}

.base-platform::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 60px;
    background: linear-gradient(180deg, #f0f7ff, #e0edff);
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 102, 255, 0.1);
}

.base-glow {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 10px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    border-radius: 50%;
    filter: blur(10px);
    opacity: 0.6;
    z-index: 1;
    animation: pulse 3s ease-in-out infinite;
}

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

@keyframes pulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 0.8; }
}


/* ================================
   Section Common Styles
   ================================ */
section {
    padding: 6rem 2rem;
    position: relative;
}

.section-alt {
    background: var(--bg-light);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-badge {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.1), rgba(0, 198, 255, 0.1));
    border: 1px solid rgba(0, 102, 255, 0.2);
    border-radius: 50px;
    color: var(--primary-color);
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

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

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* ================================
   About Section
   ================================ */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text h3 {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.about-text p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.about-highlights {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 2rem;
}

.highlight-item {
    padding: 1.5rem;
    background: white;
    border: 1px solid var(--border-light);
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-light);
}

.highlight-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-medium);
    transform: translateY(-5px);
}

.highlight-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    color: white;
    font-size: 1.5rem;
}

.highlight-item h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.highlight-item p {
    font-size: 0.9rem;
    color: var(--text-light);
    margin: 0;
}

.about-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.cyber-circle {
    position: relative;
    width: 350px;
    height: 350px;
}

/* ================================
   Services Section
   ================================ */
.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.service-card {
    position: relative;
    padding: 2rem;
    background: white;
    border: 1px solid var(--border-light);
    border-radius: 20px;
    overflow: hidden;
    transition: all 0.4s ease;
    box-shadow: var(--shadow-light);
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

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

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

.service-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.1), rgba(0, 198, 255, 0.1));
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    font-size: 1.8rem;
    transition: all 0.3s ease;
}

.service-card:hover .service-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    transform: scale(1.1);
}

.service-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.service-card p {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* ================================
   Team Section
   ================================ */
.team-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.team-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-bottom: 4rem;
}

.team-stat-card {
    text-align: center;
    padding: 2rem;
    background: white;
    border: 1px solid var(--border-light);
    border-radius: 20px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-light);
}

.team-stat-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-medium);
    transform: translateY(-5px);
}

.team-stat-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    color: white;
    font-size: 1.5rem;
}

.team-stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    line-height: 1;
}

.team-stat-label {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.team-skills {
    max-width: 700px;
    margin: 0 auto;
    background: white;
    padding: 2.5rem;
    border-radius: 20px;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-light);
}

.skill-item {
    margin-bottom: 1.5rem;
}

.skill-item:last-child {
    margin-bottom: 0;
}

.skill-name {
    display: block;
    margin-bottom: 0.75rem;
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 500;
}

.skill-bar {
    height: 10px;
    background: var(--bg-gray);
    border-radius: 10px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 10px;
    transition: width 1.5s ease;
    position: relative;
}

/* ================================
   Certificates Section
   ================================ */
.certificates-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.cert-card {
    padding: 2rem;
    background: white;
    border: 1px solid var(--border-light);
    border-radius: 20px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-light);
}

.cert-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-medium);
}

.cert-badge {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 2rem;
}

.cert-card h4 {
    font-size: 1.1rem;
    color: var(--text-primary);
    font-weight: 600;
}

/* ================================
   Cases Section
   ================================ */
.cases-intro {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 3rem;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.clients-logos {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.client-item {
    padding: 2rem;
    background: white;
    border: 1px solid var(--border-light);
    border-radius: 15px;
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-primary);
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-light);
}

.client-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-medium);
    transform: scale(1.05);
}

/* ================================
   Contact Section
   ================================ */
.contact-simple {
    max-width: 600px;
    margin: 0 auto;
}

.contact-simple-card {
    padding: 3rem;
    background: white;
    border: 1px solid var(--border-light);
    border-radius: 20px;
    box-shadow: var(--shadow-light);
    text-align: center;
}

.contact-simple-card h3 {
    font-size: 1.75rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.contact-simple-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 12px;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.contact-simple-item:last-child {
    margin-bottom: 0;
}

.contact-simple-item i {
    color: var(--primary-color);
    font-size: 1.5rem;
}
    justify-content: center;
}

/* ================================
   Footer
   ================================ */
.footer {
    background: linear-gradient(135deg, #0f172a, #1e293b);
    padding: 4rem 2rem 2rem;
    color: white;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.footer-logo-img {
    height: 45px;
    width: auto;
    filter: brightness(1.2);
}

.footer-logo span {
    font-size: 1.25rem;
    font-weight: 600;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 0.95rem;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

.footer-beian {
    margin-top: 0.5rem;
}

.footer-beian a {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.85rem;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-beian a:hover {
    color: var(--primary-color);
}

/* ================================
   Back to Top Button
   ================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: white;
    border: 2px solid var(--border-light);
    border-radius: 50%;
    color: var(--primary-color);
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
    box-shadow: var(--shadow-light);
}

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

.back-to-top:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    box-shadow: var(--shadow-medium);
    transform: translateY(-5px);
}

/* ================================
   Responsive Design
   ================================ */
@media (max-width: 1200px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .certificates-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .shield-container {
        width: 400px;
        height: 350px;
    }

    .hero-main-title {
        font-size: 3.2rem;
    }

    .floating-icon {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }
}

@media (max-width: 992px) {
    .nav-menu {
        position: fixed;
        top: 72px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 72px);
        background: white;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2rem;
        transition: left 0.3s ease;
        box-shadow: var(--shadow-medium);
    }

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

    .hamburger {
        display: flex;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

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

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

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

    .team-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .clients-logos {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-simple-card {
        padding: 2rem;
    }

    .contact-simple-item {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 576px) {
    .services-grid {
        grid-template-columns: 1fr;
    }

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

    .team-stats {
        grid-template-columns: 1fr;
    }

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

    .clients-logos {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .shield-container {
        width: 280px;
        height: 280px;
    }

    .hero-text-right {
        position: relative;
        right: auto;
        top: auto;
        transform: none;
        text-align: center;
        margin-top: 2rem;
    }

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

    .hero-tagline {
        font-size: 0.95rem;
        flex-direction: column;
        gap: 0.25rem;
    }

    .tagline-divider {
        display: none;
    }

    .floating-icon {
        width: 45px;
        height: 45px;
        font-size: 1.1rem;
    }

    .bg-line {
        display: none;
    }
}

@media (max-width: 576px) {
    .shield-container {
        width: 300px;
        height: 280px;
    }

    .hero-main-title {
        font-size: 2rem;
    }

    .hero-tagline {
        font-size: 0.85rem;
        flex-direction: column;
        gap: 0.25rem;
    }

    .tagline-divider {
        display: none;
    }

    .floating-icon {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .floating-icon.icon-1 {
        left: -20px;
    }
    .floating-icon.icon-2 {
        right: -10px;
    }

    .bg-line {
        display: none;
    }

    .base-platform {
        width: 200px;
    }

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

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }

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