/* === Reset & Variables === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --bg: #0a0a0b;
    --bg-alt: #111114;
    --bg-card: #16161a;
    --bg-card-hover: #1c1c21;
    --text: #e4e4e7;
    --text-muted: #8b8b95;
    --accent: #0ea5e9;
    --accent-glow: rgba(14, 165, 233, 0.15);
    --accent-orange: #f97316;
    --border: rgba(255, 255, 255, 0.06);
    --radius: 12px;
    --radius-sm: 8px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --max-width: 1200px;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 0.8; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.accent { color: var(--accent); }

/* === Navigation === */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 16px 0;
    background: rgba(10, 10, 11, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: padding 0.3s;
}

.nav.scrolled { padding: 10px 0; }

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 0px;
}

.logo-icon { color: var(--accent); font-size: 1rem; }
.logo-svg { flex-shrink: 0; margin-right: -16px; }

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

.nav-links a {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover { color: var(--text); opacity: 1; }

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: 0.3s;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 0 20px var(--accent-glow);
}

.btn-primary:hover {
    background: #0284c7;
    opacity: 1;
    transform: translateY(-1px);
    box-shadow: 0 0 30px var(--accent-glow);
}

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

.btn-ghost:hover {
    border-color: var(--text-muted);
    opacity: 1;
}

.btn-sm { padding: 8px 20px; font-size: 0.8rem; }
.btn-full { width: 100%; }

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

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 60% 50% at 50% 0%, var(--accent-glow), transparent),
        radial-gradient(ellipse 40% 40% at 80% 20%, rgba(249, 115, 22, 0.05), transparent);
    pointer-events: none;
}

.hero-content { position: relative; max-width: 800px; }

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 100px;
    border: 1px solid var(--border);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 24px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.hero h1 {
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.hero-sub {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 560px;
    line-height: 1.7;
    margin-bottom: 40px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 64px;
}

.hero-stats {
    display: flex;
    gap: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
}

.stat-num {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* === Sections === */
.section {
    padding: 100px 0;
}

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

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 12px;
}

.section-header h2 {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.section-header p {
    color: var(--text-muted);
    font-size: 1.05rem;
}

/* === Cards Grid === */
.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 28px;
    transition: all 0.3s;
}

.card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(14, 165, 233, 0.15);
    transform: translateY(-2px);
}

.card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: var(--accent-glow);
    color: var(--accent);
    margin-bottom: 20px;
}

.card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* === Industries === */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.industry-card {
    display: flex;
    gap: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    transition: all 0.3s;
}

.industry-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(14, 165, 233, 0.15);
}

.industry-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.industry-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.industry-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* === Materials === */
.materials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.material {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    text-align: center;
}

.material-tier {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.material-tier.highlight { color: var(--accent); }

.material-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin-bottom: 16px;
}

.material-tag {
    padding: 6px 14px;
    border-radius: 100px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    font-size: 0.8rem;
    font-weight: 500;
}

.material p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* === Steps === */
.steps {
    display: flex;
    align-items: flex-start;
    gap: 24px;
    justify-content: center;
}

.step {
    flex: 1;
    max-width: 320px;
    text-align: center;
}

.step-num {
    font-size: 3rem;
    font-weight: 800;
    color: var(--accent);
    opacity: 0.3;
    line-height: 1;
    margin-bottom: 16px;
}

.step h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.step p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.step-arrow {
    font-size: 1.5rem;
    color: var(--text-muted);
    opacity: 0.3;
    margin-top: 30px;
    flex-shrink: 0;
}

/* === About === */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-grid h2 {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 12px 0 20px;
}

.about-grid > div:first-child p {
    color: var(--text-muted);
    margin-bottom: 16px;
    line-height: 1.7;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.about-feature {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.about-feature .accent { font-size: 1.2rem; margin-top: 2px; }

.about-feature strong {
    display: block;
    margin-bottom: 4px;
    font-size: 0.95rem;
}

.about-feature p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 0;
}

/* === Contact === */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-grid h2 {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 12px 0 16px;
}

.contact-grid > div:first-child > p {
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 32px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.contact-item svg { color: var(--accent); flex-shrink: 0; }
.contact-item a { color: var(--text); }

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
    width: 100%;
    padding: 14px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.9rem;
    transition: border-color 0.2s;
    outline: none;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
    border-color: var(--accent);
}

.contact-form select { cursor: pointer; }
.contact-form select option { background: var(--bg); }
.contact-form textarea { resize: vertical; min-height: 100px; }

/* === Footer === */
.footer {
    padding: 48px 0;
    border-top: 1px solid var(--border);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-brand p {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 4px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-copy {
    text-align: right;
}

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

/* === Animations === */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* === Responsive === */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .materials-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--bg);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 32px;
        z-index: 99;
    }

    .nav-links.open { display: flex; }
    .nav-links a { font-size: 1.2rem; }

    .hamburger { display: flex; z-index: 101; }
    .hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
    .hamburger.open span:nth-child(2) { opacity: 0; }
    .hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

    .hero { padding: 100px 0 60px; }
    .hero h1 { font-size: 2.75rem; }
    .hero-stats { flex-direction: column; gap: 24px; }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { text-align: center; }

    .grid-4 { grid-template-columns: 1fr; }
    .grid-2 { grid-template-columns: 1fr; }
    .materials-grid { grid-template-columns: 1fr; }
    .about-grid { grid-template-columns: 1fr; gap: 40px; }
    .contact-grid { grid-template-columns: 1fr; gap: 40px; }

    .steps { flex-direction: column; align-items: center; }
    .step-arrow { transform: rotate(90deg); }

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

    .section { padding: 72px 0; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 2.25rem; }
    .container { padding: 0 16px; }
}