/* CSS Variables & Global Resets */
:root {
    /* Colors */
    --bg-dark: #0a0e17;
    --bg-darker: #05070a;
    --bg-card: rgba(16, 23, 41, 0.7);
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;

    --primary: #E31E24;
    /* Corporate Red */
    --primary-glow: rgba(227, 30, 36, 0.4);
    --secondary: #008F4C;
    /* Corporate Green */
    --accent: #808080;
    /* Corporate Gray */

    /* Specific Gases */
    --argon: #3b82f6;
    /* Blue */
    --oxygen: #10b981;
    /* Green */
    --nitrogen: #8b5cf6;
    /* Purple */
    --mixes: #f59e0b;
    /* Orange */

    /* Typography */
    --font-main: 'Outfit', sans-serif;

    /* Effects */
    --glass-border: 1px solid rgba(255, 255, 255, 0.08);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-padding {
    padding: 6rem 0;
}

/* Typography Utilities */
h1,
h2,
h3,
h4 {
    color: #fff;
    font-weight: 800;
    line-height: 1.2;
}

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

.text-accent {
    color: var(--primary);
}

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

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-primary-outline {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    font-size: 1rem;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    border: none;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(56, 189, 248, 0.7);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.btn-primary-outline {
    border: 1px solid var(--primary);
    color: var(--primary);
    padding: 0.5rem 1.2rem;
}

.btn-primary-outline:hover,
.nav-links a.btn-primary-outline:hover {
    background: var(--primary);
    color: #fff;
}

.w-100 {
    width: 100%;
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: all 0.3s ease;
    padding: 1.5rem 0;
}

header.scrolled {
    background: rgba(10, 14, 23, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: var(--glass-border);
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    display: none;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    font-weight: 600;
    font-size: 0.95rem;
    transition: color 0.3s;
}

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

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background-color: var(--bg-darker);
    overflow: hidden;
    padding-top: 5rem;
}

.hero-bg-animated {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 30%, rgba(227, 30, 36, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(0, 143, 76, 0.05) 0%, transparent 40%);
    z-index: 1;
    animation: pulse 10s infinite alternate;
}

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

    100% {
        transform: scale(1.1);
        opacity: 1;
    }
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    padding: 0 2rem;
}

.hero-content h1 {
    font-size: 4rem;
    margin-bottom: 1.5rem;
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-btns {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
}

/* About / Features Section */
.section-title {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

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

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

.feature-card {
    background: var(--bg-card);
    border: var(--glass-border);
    border-radius: 20px;
    padding: 2.5rem 2rem;
    text-align: center;
    box-shadow: var(--glass-shadow);
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease, border-color 0.3s;
}

.feature-card:hover {
    transform: translateY(-10px);
    border-color: rgba(56, 189, 248, 0.3);
}

.feature-icon {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-muted);
}

/* Products Section */
.products {
    background-color: var(--bg-darker);
    position: relative;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
}

.product-card {
    background: var(--bg-card);
    border: var(--glass-border);
    border-radius: 20px;
    padding: 2.5rem 2rem;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    transition: all 0.4s ease;
}

.card-glow {
    position: absolute;
    top: -50px;
    right: -50px;
    width: 150px;
    height: 150px;
    border-radius: 50%;
    filter: blur(50px);
    opacity: 0.15;
    transition: opacity 0.4s;
}

.product-card:hover .card-glow {
    opacity: 0.4;
}

.glow-blue {
    background-color: var(--argon);
}

.glow-green {
    background-color: var(--oxygen);
}

.glow-purple {
    background-color: var(--nitrogen);
}

.glow-orange {
    background-color: var(--mixes);
}

.product-icon {
    width: 60px;
    height: 60px;
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: #fff;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.icon-argon {
    background: linear-gradient(135deg, #60a5fa, var(--argon));
}

.icon-oxygen {
    background: linear-gradient(135deg, #34d399, var(--oxygen));
}

.icon-nitrogen {
    background: linear-gradient(135deg, #a78bfa, var(--nitrogen));
}

.icon-others {
    background: linear-gradient(135deg, #fbbf24, var(--mixes));
}

.product-card h3 {
    font-size: 1.6rem;
    margin-bottom: 1rem;
}

.product-card p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.product-features {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 1rem;
}

.product-features li {
    font-size: 0.9rem;
    color: #cbd5e1;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.product-features i {
    color: var(--accent);
    font-size: 0.8rem;
}

.product-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.15);
}

/* Contact Section */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.contact-info h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.contact-info p {
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    font-size: 1.1rem;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    font-size: 1.1rem;
}

.contact-item i {
    width: 50px;
    height: 50px;
    background: rgba(56, 189, 248, 0.1);
    color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    border: var(--glass-border);
}

.contact-form-wrapper {
    background: var(--bg-card);
    border: var(--glass-border);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: var(--glass-shadow);
    backdrop-filter: blur(10px);
}

.contact-form h3 {
    margin-bottom: 2rem;
    font-size: 1.5rem;
}

.form-message {
    padding: 1rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.form-message.success {
    background: rgba(16, 185, 129, 0.2);
    color: #10b981;
    border: 1px solid #10b981;
}

.form-message.error {
    background: rgba(244, 63, 94, 0.2);
    color: #f43f5e;
    border: 1px solid #f43f5e;
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group input,
.input-group select,
.input-group textarea {
    width: 100%;
    padding: 1rem 1.5rem;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    color: #fff;
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s;
}

.input-group input:focus,
.input-group select:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(0, 0, 0, 0.4);
}

.input-group select {
    appearance: none;
    cursor: pointer;
}

.input-group select option {
    background: var(--bg-dark);
    color: #fff;
}

/* Staff Section */
.staff {
    background: radial-gradient(circle at bottom right, rgba(56, 189, 248, 0.05) 0%, transparent 40%);
}

.staff-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    max-width: 900px;
    margin: 0 auto;
}

.staff-card {
    background: var(--bg-card);
    border: var(--glass-border);
    border-radius: 20px;
    padding: 3rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    transition: all 0.4s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.staff-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

.staff-icon {
    width: 90px;
    height: 90px;
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.8rem;
    margin-bottom: 2rem;
    color: #fff;
    position: relative;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.icon-sales {
    background: linear-gradient(135deg, var(--accent), #14b8a6);
    box-shadow: 0 10px 25px rgba(45, 212, 191, 0.3);
}

.icon-logistics {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    box-shadow: 0 10px 25px rgba(56, 189, 248, 0.3);
}

.staff-card:hover .staff-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
}

.staff-card h3 {
    font-size: 1.7rem;
    margin-bottom: 1.2rem;
}

.staff-card p {
    color: var(--text-muted);
    margin-bottom: 2rem;
    font-size: 1rem;
}

.btn-staff {
    padding: 0.8rem 1.5rem;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #fff;
    font-weight: 600;
    transition: all 0.3s;
}

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

/* Footer */
footer {
    background: #000;
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-bottom {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 900px) {
    .contact-container {
        grid-template-columns: 1fr;
    }

    .hero-content h1 {
        font-size: 3rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        /* simple hidden for mobile, could add hamburger */
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

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

    .section-padding {
        padding: 4rem 0;
    }
}