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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

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

/* Navigation - unified header/dropdown (improved visuals + accessibility) */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(8px);
    box-shadow: 0 6px 20px rgba(16,24,40,0.06);
    border-bottom: 1px solid rgba(16,24,40,0.04);
    z-index: 1000;
    padding: 0.6rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.logo h2 {
    color: #0f172a;
    color: #1e88e5; /* brand blue */
    font-weight: 800;
    font-size: 1.15rem;
    letter-spacing: 0.3px;
}

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

.footer-section img {
    height: 60px;
    width: auto;
    margin-bottom: 1rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 1.25rem;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: #0f172a;
    font-weight: 600;
    padding: 0.45rem 0.6rem;
    border-radius: 8px;
    transition: background-color 180ms ease, color 180ms ease, transform 120ms ease;
}

.nav-menu a:hover,
.nav-menu a:focus {
    background: linear-gradient(90deg,#06b6d4,#3b82f6);
    color: #fff;
    transform: translateY(-1px);
    outline: none;
    box-shadow: 0 8px 24px rgba(59,130,246,0.12);
}

.nav-menu a.active {
    background: linear-gradient(90deg,#06b6d4,#3b82f6);
    color: #fff;
}

/* Dropdown Menu */
.dropdown {
    position: relative;
}

.dropdown > a::after {
    content: '▾';
    display: inline-block;
    margin-left: 8px;
    font-size: 0.72rem;
    transition: transform 220ms ease;
    vertical-align: middle;
    color: rgba(15,23,42,0.7);
}

.dropdown:focus-within > a::after,
.dropdown:hover > a::after {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    background: #fff;
    min-width: 220px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(2,6,23,0.08);
    padding: 6px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px) scale(0.98);
    transform-origin: top left;
    transition: opacity 180ms ease, transform 180ms ease, visibility 180ms;
    z-index: 1100;
    list-style: none;
}

.dropdown:hover .dropdown-menu,
.dropdown:focus-within .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.dropdown-menu li { margin: 0; }

.dropdown-menu a {
    display: block;
    padding: 0.6rem 1rem;
    color: #0f172a;
    text-decoration: none;
    transition: background 120ms ease, color 120ms ease, border-left-color 120ms ease;
    border-left: 4px solid transparent;
}

.dropdown-menu a:hover,
.dropdown-menu a:focus {
    background: linear-gradient(90deg, rgba(6,182,212,0.06), rgba(59,130,246,0.06));
    color: #0369a1;
    border-left-color: #06b6d4;
    outline: none;
}

/* Focus outlines for keyboard users */
.nav-menu a:focus,
.dropdown-menu a:focus {
    box-shadow: 0 0 0 4px rgba(59,130,246,0.12);
}

/* Mobile toggle button */
.nav-toggle {
    display: none;
    background: transparent;
    border: none;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}
.hamburger {
    width: 24px;
    height: 3px;
    background: #1e293b;
    position: relative;
    transition: all 0.3s ease;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 3px;
    background: #1e293b;
    transition: all 0.3s ease;
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    top: 8px;
}

.nav-toggle.active .hamburger {
    background: transparent;
}

.nav-toggle.active .hamburger::before {
    transform: rotate(45deg);
    top: 0;
}

.nav-toggle.active .hamburger::after {
    transform: rotate(-45deg);
    top: 0;
}


/* Responsive tweaks */
@media (max-width: 920px) {
    .nav-menu { gap: 0.6rem; }
    .logo h2 { font-size: 1.05rem; }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: 20px;
        gap: 10px;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-menu li {
        width: 100%;
    }
    
    .nav-menu a {
        display: block;
        width: 100%;
        padding: 12px 16px;
        text-align: left;
    }
    
    .dropdown-menu {
        position: static;
        background: rgba(248, 250, 252, 0.9);
        box-shadow: none;
        border-radius: 8px;
        margin-top: 8px;
        transform: none;
        opacity: 0;
        visibility: hidden;
        max-height: 0;
        overflow: hidden;
        transition: all 0.3s ease;
    }
    
    .dropdown.active .dropdown-menu {
        opacity: 1;
        visibility: visible;
        max-height: 300px;
    }
    
    .dropdown > a::after {
        float: right;
    }
}

/* Hero Sections */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    padding: 0 20px;
    position: relative;
    z-index: 3;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-content p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

/* Oxygen Page Styles */
.oxygen-page .oxygen-hero {
    background: linear-gradient(rgba(59, 130, 246, 0.8), rgba(147, 197, 253, 0.8)), url('Images/hospital1.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.bubble-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.bubble-bg::before {
    content: '';
    position: absolute;
    width: 100px;
    height: 100px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    animation: bubbleFloat1 8s ease-in-out infinite;
    left: 10%;
    top: 20%;
}

.bubble-bg::after {
    content: '';
    position: absolute;
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    animation: bubbleFloat2 6s ease-in-out infinite;
    right: 15%;
    top: 60%;
}

@keyframes bubbleFloat1 {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-20px) scale(1.1); }
}

@keyframes bubbleFloat2 {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-15px) scale(0.9); }
}

/* Nitrogen Page Styles */
.nitrogen-page .nitrogen-hero {
    background: linear-gradient(rgba(226, 232, 240, 0.8), rgba(203, 213, 225, 0.8)), url('Images/industry1.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.frost-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="3" fill="rgba(255,255,255,0.3)"/><circle cx="80" cy="40" r="2" fill="rgba(255,255,255,0.3)"/><circle cx="40" cy="80" r="4" fill="rgba(255,255,255,0.3)"/></svg>');
    animation: frostMove 15s linear infinite;
    z-index: 1;
}

@keyframes frostMove {
    0% { transform: translateX(0) translateY(0); }
    100% { transform: translateX(-50px) translateY(-30px); }
}

.nitrogen-page .hero-content h1,
.nitrogen-page .hero-content p {
    color: #1e293b;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.5);
}

/* Argon Page Styles */
.argon-page .argon-hero {
    background: linear-gradient(rgba(55, 65, 81, 0.8), rgba(107, 114, 128, 0.8)), url('Images/coloredcyclinders.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.sparks-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.sparks-bg::before,
.sparks-bg::after {
    content: '';
    position: absolute;
    width: 4px;
    height: 4px;
    background: #fbbf24;
    border-radius: 50%;
    animation: sparkle 2s ease-in-out infinite;
}

.sparks-bg::before {
    left: 20%;
    top: 30%;
    animation-delay: 0s;
}

.sparks-bg::after {
    right: 25%;
    bottom: 40%;
    animation-delay: 1s;
}

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

/* CO2 Page Styles */
.co2-page .co2-hero {
    background: linear-gradient(rgba(30, 41, 59, 0.8), rgba(59, 130, 246, 0.8)), url('Images/enetrtainment2.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.bubbles-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

/* Isometric grid for CO2 page */
.iso-bg {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    filter: blur(3px);
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='208' viewBox='0 0 240 208'><defs><linearGradient id='g' x1='0' x2='1'><stop offset='0%' stop-color='%23ffffff' stop-opacity='0.06'/><stop offset='100%' stop-color='%23007cf7' stop-opacity='0.02'/></linearGradient></defs><g fill='none' stroke='%23ffffff' stroke-opacity='0.06' stroke-width='1'><path d='M0 52 L60 26 L120 52 L60 78 Z'/><path d='M120 52 L180 26 L240 52 L180 78 Z'/><path d='M0 156 L60 130 L120 156 L60 182 Z'/><path d='M120 156 L180 130 L240 156 L180 182 Z'/></g><g id='nodes' fill='%23ffffff' fill-opacity='0.08'><circle cx='60' cy='26' r='3'/><circle cx='120' cy='52' r='3'/><circle cx='180' cy='26' r='3'/></g></svg>");
    background-repeat: repeat;
}

/* pulsing nodes (simulate carbonation bubbles) */
.iso-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.08), transparent 8%), radial-gradient(circle at 60% 50%, rgba(255,255,255,0.06), transparent 6%), radial-gradient(circle at 85% 25%, rgba(255,255,255,0.05), transparent 6%);
    animation: nodePulse 3.5s ease-in-out infinite;
    z-index: 2;
    mix-blend-mode: screen;
    pointer-events: none;
}

@keyframes nodePulse { 0%{opacity:0.4; transform:scale(0.96)}50%{opacity:0.95; transform:scale(1.06)}100%{opacity:0.4; transform:scale(0.96)} }

/* ensure hero content sits above */
.co2-hero .hero-content { position: relative; z-index: 3; }

.bubbles-bg::before,
.bubbles-bg::after {
    content: '';
    position: absolute;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    animation: co2Bubbles 4s ease-in-out infinite;
}

.bubbles-bg::before {
    width: 80px;
    height: 80px;
    left: 15%;
    bottom: 20%;
}

.bubbles-bg::after {
    width: 60px;
    height: 60px;
    right: 20%;
    top: 30%;
    animation-delay: 2s;
}

@keyframes co2Bubbles {
    0%, 100% { transform: translateY(0) scale(1); opacity: 0.2; }
    50% { transform: translateY(-30px) scale(1.2); opacity: 0.6; }
}

/* Nitrous Oxide Page Styles */
.nitrous-page .nitrous-hero {
    background: linear-gradient(rgba(219, 234, 254, 0.8), rgba(191, 219, 254, 0.8)), url('Images/colorcyc2.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.waves-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 100"><path d="M0,50 Q50,30 100,50 T200,50" stroke="rgba(255,255,255,0.3)" stroke-width="2" fill="none"/></svg>');
    animation: waveMove 8s ease-in-out infinite;
    z-index: 1;
}

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

.nitrous-page .hero-content h1,
.nitrous-page .hero-content p {
    color: #1e293b;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.5);
}

/* Radial concentric background for Nitrous Oxide page */
.rad-bg {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    background-image: radial-gradient(circle at 30% 40%, rgba(99,102,241,0.06) 0%, transparent 20%), radial-gradient(circle at 70% 60%, rgba(14,165,233,0.04) 0%, transparent 18%);
    filter: blur(4px);
    transform-origin: center center;
    animation: scaleRad 12s linear infinite;
}

@keyframes scaleRad { 0%{transform:scale(1)}50%{transform:scale(1.02)}100%{transform:scale(1)} }

/* stack hero content above radial bg */
.nitrous-hero .hero-content { position: relative; z-index: 2; }

/* Hexagonal background for Nitrogen page */
.hex-bg {
    background-image:
        linear-gradient(120deg, rgba(0,0,0,0.02) 12%, transparent 12%),
        linear-gradient(60deg, rgba(0,0,0,0.02) 12%, transparent 12%),
        linear-gradient(120deg, rgba(255,255,255,0.02) 12%, transparent 12%),
        linear-gradient(60deg, rgba(255,255,255,0.02) 12%, transparent 12%);
    background-size: 40px 69px;
    background-position: 0 0, 0 0, 20px 35px, 20px 35px;
    opacity:0.12;
    position:absolute;
    inset:0;
    z-index:1;
    animation: hexPulse 8s infinite linear;
    pointer-events: none;
}

@keyframes hexPulse { 0%{opacity:0.06}50%{opacity:0.16}100%{opacity:0.06} }

/* subtle neon glow accents using SVG overlay approach */
.nitrogen-hero::after {
        content: '';
        position: absolute;
        inset: 0;
        background-image: radial-gradient(circle at 20% 30%, rgba(99,102,241,0.06), transparent 10%), radial-gradient(circle at 80% 70%, rgba(34,197,94,0.04), transparent 12%);
        z-index: 0;
}

/* content panel style (from suggestion) */
.content-panel {
    background: rgba(8,18,30,0.03);
    padding: 28px;
    border-radius: 12px;
}

/* Ensure nitrogen page hero content sits above hex/bg */
.nitrogen-hero .hero-content { position: relative; z-index: 2; }



/* Gas Mixtures Page Styles */
.mixtures-page .mixtures-hero {
    background: linear-gradient(rgba(124, 58, 237, 0.8), rgba(168, 85, 247, 0.8), rgba(236, 72, 153, 0.8), rgba(245, 158, 11, 0.8)), url('Images/colorcys4.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

/* Triangular tessellation background for Argon page */
.tri-bg {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    filter: blur(6px);
    transform: translateZ(0);
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="400" height="350" viewBox="0 0 400 350"><defs><linearGradient id="m" x1="0" x2="1"><stop offset="0%" stop-color="%23d1d5db" stop-opacity="0.06"/><stop offset="100%" stop-color="%236b7280" stop-opacity="0.04"/></linearGradient></defs><g fill="url(%23m)"><path d="M200 0 L240 60 L160 60 Z"/><path d="M120 60 L160 120 L80 120 Z"/><path d="M280 60 L320 120 L240 120 Z"/><path d="M200 120 L240 180 L160 180 Z"/><path d="M120 180 L160 240 L80 240 Z"/><path d="M280 180 L320 240 L240 240 Z"/></g></svg>');
    background-repeat: repeat;
    opacity: 0.12;
    animation: triMove 20s linear infinite;
}

@keyframes triMove { 0%{transform:translateY(0)}50%{transform:translateY(12px)}100%{transform:translateY(0)} }

/* ensure hero content stacks above */
.argon-hero .hero-content { position: relative; z-index: 2; }

/* metallic sheen overlay */
.argon-hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, rgba(255,255,255,0.02), rgba(255,255,255,0.005));
    z-index: 0;
}

.molecules-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="3" fill="rgba(255,255,255,0.3)"/><circle cx="80" cy="40" r="2" fill="rgba(255,255,255,0.3)"/><circle cx="40" cy="80" r="4" fill="rgba(255,255,255,0.3)"/><line x1="20" y1="20" x2="40" y2="80" stroke="rgba(255,255,255,0.2)" stroke-width="1"/><line x1="40" y1="80" x2="80" y2="40" stroke="rgba(255,255,255,0.2)" stroke-width="1"/></svg>');
    animation: moleculeConnect 10s ease-in-out infinite;
    z-index: 1;
}

@keyframes moleculeConnect {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.1); }
}

/* Polygon network background for Gas Mixtures page */
.net-bg {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    filter: blur(2px);
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='400' height='300' viewBox='0 0 400 300'><g fill='none' stroke='%23ffffff' stroke-opacity='0.06' stroke-width='1'><line x1='40' y1='40' x2='120' y2='20'/><line x1='120' y1='20' x2='200' y2='40'/><line x1='200' y1='40' x2='280' y2='20'/><line x1='40' y1='140' x2='120' y2='120'/><line x1='120' y1='120' x2='200' y2='140'/></g><g fill='%23ffffff' fill-opacity='0.06'><circle cx='40' cy='40' r='3'/><circle cx='120' cy='20' r='3'/><circle cx='200' cy='40' r='3'/><circle cx='280' cy='20' r='3'/></g></svg>");
    background-repeat: repeat;
}

/* subtle pulse for network nodes */
.net-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 10% 10%, rgba(59,130,246,0.06), transparent 6%), radial-gradient(circle at 30% 40%, rgba(99,102,241,0.05), transparent 5%), radial-gradient(circle at 70% 20%, rgba(16,185,129,0.04), transparent 5%);
    animation: netPulse 6s ease-in-out infinite;
    z-index: 2;
    mix-blend-mode: screen;
}

@keyframes netPulse { 0%{opacity:0.5;transform:scale(0.98)}50%{opacity:0.95;transform:scale(1.02)}100%{opacity:0.5;transform:scale(0.98)} }

/* ensure mixtures hero content sits above network */
.mixtures-hero .hero-content { position: relative; z-index: 3; }

/* Content Section */
.content-section {
    padding: 100px 0;
    background: #f8fafc;
    position: relative;
}

.poly-bg {
    pointer-events: none;
    width: 100%;
    height: 100%;
}

.content-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
}

/* Lightweight content panel utility for patterned backgrounds */
.content-panel {
    background: rgba(255,255,255,0.75);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border-radius: 16px;
    padding: 28px;
}

/* Inline SVG background helper placed inside hero sections */
.page-svg-bg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    opacity: 0.12;
}

.content-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #3b82f6, #1d4ed8, #3b82f6);
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% { transform: translateX(-100%); }
    50% { transform: translateX(100%); }
}

.content-card h2 {
    color: #1e293b;
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    line-height: 1.3;
}

.content-card p {
    color: #475569;
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.specs {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(147, 197, 253, 0.05));
    padding: 25px;
    border-radius: 15px;
    margin: 25px 0;
    border-left: 5px solid #3b82f6;
    position: relative;
    overflow: hidden;
}

.specs::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.1), transparent);
    border-radius: 50%;
}

.specs h4 {
    color: #1e293b;
    margin-bottom: 10px;
}

.specs ul {
    list-style: none;
    padding: 0;
}

.specs li {
    padding: 5px 0;
    color: #475569;
    position: relative;
    padding-left: 20px;
}

.specs li:before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #10b981;
    font-weight: bold;
}

.cta-section {
    background: linear-gradient(135deg, #3b82f6, #1d4ed8, #2563eb);
    color: white;
    padding: 25px;
    border-radius: 15px;
    margin-top: 30px;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    animation: ctaShine 3s ease-in-out infinite;
}

@keyframes ctaShine {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

.cta-section p {
    position: relative;
    z-index: 2;
    margin: 0;
    font-size: 1.1rem;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    align-items: start;
    max-width: 1400px;
    margin: 0 auto;
}

/* Make the two columns act like equal-height cards using CSS Grid and stretch */
.content-grid > .content-image,
.content-grid > .content-card {
    display: flex;
    flex-direction: column;
}

.content-grid > .content-image {
    justify-content: center;
    align-items: center;
}

.content-grid > .content-card {
    justify-content: flex-start;
}

/* Full-width content card that sits below the two-column grid */
.full-content-card {
    margin-top: 2.5rem;
    background: rgba(255,255,255,0.98);
    border-radius: 20px;
    padding: 35px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.07);
    border: 1px solid rgba(0,0,0,0.03);
    color: #334155;
}

.full-content-card p {
    font-size: 1.05rem;
    line-height: 1.75;
    margin-bottom: 1rem;
}

/* Slightly reduce image size on large screens to keep balanced look */
.content-image img {
    max-width: 360px;
}

.content-text h2 {
    font-size: 2.5rem;
    color: #1e293b;
    margin-bottom: 1.5rem;
}

.content-text p {
    font-size: 1.1rem;
    color: #64748b;
    margin-bottom: 1.5rem;
}

.content-image {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 500px;
}

.content-image img {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: 25px;
    box-shadow: 0 25px 50px rgba(59, 130, 246, 0.3);
    transition: all 0.3s ease;
    border: 3px solid rgba(255, 255, 255, 0.8);
}

.content-image img:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 35px 70px rgba(59, 130, 246, 0.4);
}

.content-image::before {
    content: '';
    position: absolute;
    top: -20px;
    left: -20px;
    right: -20px;
    bottom: -20px;
    background: linear-gradient(45deg, rgba(59, 130, 246, 0.1), rgba(147, 197, 253, 0.1));
    border-radius: 30px;
    z-index: -1;
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.5; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.05); }
}

/* Applications Section */
.applications-section {
    padding: 100px 0;
    background: white;
}

.applications-section h2 {
    text-align: center;
    font-size: 2.5rem;
    color: #1e293b;
    margin-bottom: 3rem;
}

.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.app-card {
    background: #f8fafc;
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.app-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(83, 184, 228, 0.2);
    border-color: #53B8E4;
}

.app-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: iconPulse 3s ease-in-out infinite;
}

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

.app-card h3 {
    color: #1e293b;
    font-size: 1.2rem;
}

/* Footer */
.footer {
    background: #1e293b;
    color: white;
    padding: 50px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    color: #53B8E4;
    margin-bottom: 1rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: #cbd5e1;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: #53B8E4;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    padding: 0.5rem 1rem;
    background: rgba(83, 184, 228, 0.2);
    border-radius: 25px;
    transition: all 0.3s;
}

.social-links a:hover {
    background: #53B8E4;
    transform: translateY(-2px);
}

.quote-contact {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.quote-contact p {
    color: #cbd5e1;
    margin: 0;
}

.whatsapp-btn {
    background: #25d366;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    text-align: center;
}

.whatsapp-btn:hover {
    background: #128c7e;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(37, 211, 102, 0.3);
}

.email-btn {
    background: #ea4335;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    text-align: center;
    margin-top: 0.5rem;
    display: block;
}

.email-btn:hover {
    background: #d33b2c;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(234, 67, 53, 0.3);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #374151;
    color: #9ca3af;
}

/* Argon Mixtures Section */
.argon-mixtures-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #e2e8f0, #f1f5f9);
    position: relative;
    overflow: hidden;
}

.argon-mixtures-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><polygon points="50,10 90,30 90,70 50,90 10,70 10,30" fill="none" stroke="rgba(100,116,139,0.1)" stroke-width="1"/><polygon points="25,25 75,25 87.5,50 75,75 25,75 12.5,50" fill="none" stroke="rgba(148,163,184,0.08)" stroke-width="1"/></svg>');
    opacity: 0.3;
}

.argon-mixtures-section h2 {
    text-align: center;
    font-size: 2.5rem;
    color: #1e293b;
    margin-bottom: 3rem;
    position: relative;
    z-index: 2;
}

.mixtures-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    position: relative;
    z-index: 2;
}

.mixture-card {
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.mixture-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(148, 163, 184, 0.1), rgba(203, 213, 225, 0.05));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.mixture-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(100, 116, 139, 0.2);
    background: rgba(255, 255, 255, 0.35);
}

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

.mixture-card h3 {
    color: #1e293b;
    font-size: 1.3rem;
    margin-bottom: 1rem;
    position: relative;
    z-index: 2;
}

.mixture-card p {
    color: #475569;
    line-height: 1.6;
    position: relative;
    z-index: 2;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .content-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .content-image {
        order: -1;
        min-height: 300px;
    }
    
    .content-card {
        padding: 30px;
    }

    .full-content-card {
        padding: 25px;
    }
    
    .mixtures-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .content-card {
        padding: 25px;
    }
    
    .content-card h2 {
        font-size: 1.8rem;
    }
    
    .content-image {
        min-height: 250px;
    }
    
    .content-image img {
        max-width: 300px;
    }
    
    .applications-grid {
        grid-template-columns: 1fr;
    }
}