/* ==========================================================================
   Centra Matrix Innovation Limited — Design System
   Palette: Orange / Ash / Black — signature: blueprint-trace grid motif
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
    --c-orange: #E86A17;
    --c-orange-bright: #FF8A3D;
    --c-ash: #8A8D91;
    --c-ash-light: #C7C9CC;
    --c-black: #101112;
    --c-steel: #1B1D20;
    --c-steel-2: #2A2D31;
    --c-offwhite: #F5F4F2;
    --c-white: #FFFFFF;
    --c-success: #2E9E5B;
    --c-danger: #D64545;

    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;

    --container: 1200px;
    --radius: 6px;
    --transition: 0.25s ease;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: var(--font-body);
    background: var(--c-offwhite);
    color: var(--c-black);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.15;
    margin: 0 0 0.5em;
    letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.4rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3.4vw, 2.6rem); }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1em; }

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

.eyebrow {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--c-orange);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 14px;
}
.eyebrow::before {
    content: '';
    width: 18px;
    height: 1px;
    background: var(--c-orange);
    display: inline-block;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 26px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    border: 1px solid transparent;
    transition: transform var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--c-orange); color: var(--c-white); }
.btn-primary:hover { background: var(--c-orange-bright); }
.btn-outline { border-color: var(--c-ash); color: var(--c-black); background: transparent; }
.btn-outline:hover { border-color: var(--c-black); }
.btn-outline-light { border-color: rgba(255,255,255,0.35); color: var(--c-white); background: transparent; }
.btn-outline-light:hover { border-color: var(--c-white); }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(16,17,18,0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 76px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand img { height: 40px; width: auto; }
.brand-text { font-family: var(--font-display); font-weight: 700; color: var(--c-white); font-size: 1.05rem; line-height: 1.1; }
.brand-text small { display: block; font-family: var(--font-mono); font-weight: 400; font-size: 0.62rem; color: var(--c-ash-light); letter-spacing: 0.08em; text-transform: uppercase; margin-top: 2px; }

.main-nav { display: flex; align-items: center; gap: 32px; }
.main-nav a {
    color: var(--c-ash-light);
    font-size: 0.92rem;
    font-weight: 500;
    position: relative;
    padding: 4px 0;
    transition: color var(--transition);
}
.main-nav a:hover, .main-nav a.active { color: var(--c-white); }
.main-nav a.active::after {
    content: '';
    position: absolute;
    left: 0; bottom: -4px;
    width: 100%; height: 2px;
    background: var(--c-orange);
}
.nav-cta { margin-left: 8px; }

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--c-white);
    font-size: 1.6rem;
    cursor: pointer;
}

@media (max-width: 900px) {
    .main-nav {
        position: fixed;
        top: 76px; left: 0; right: 0; bottom: 0;
        background: var(--c-black);
        flex-direction: column;
        align-items: flex-start;
        padding: 32px 24px;
        gap: 22px;
        transform: translateX(100%);
        transition: transform 0.3s ease;
    }
    .main-nav.open { transform: translateX(0); }
    .nav-toggle { display: block; }
}

/* ==========================================================================
   Hero + blueprint-grid signature motif
   ========================================================================== */
.hero {
    position: relative;
    background: var(--c-black);
    color: var(--c-white);
    padding: 120px 0 100px;
    overflow: hidden;
}
.hero::before {
    /* blueprint dot-grid */
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(232,106,23,0.35) 1px, transparent 1px);
    background-size: 28px 28px;
    mask-image: linear-gradient(to bottom, transparent, black 15%, black 60%, transparent);
    opacity: 0.5;
    pointer-events: none;
}
.hero::after {
    content: '';
    position: absolute;
    top: 0; right: -10%;
    width: 60%; height: 100%;
    background: linear-gradient(120deg, transparent 40%, rgba(232,106,23,0.06) 41%, transparent 42%),
                linear-gradient(120deg, transparent 60%, rgba(138,141,145,0.08) 61%, transparent 62%);
    pointer-events: none;
}
.hero-inner { position: relative; z-index: 2; max-width: 720px; }
.hero h1 { color: var(--c-white); }
.hero h1 .accent { color: var(--c-orange); }
.hero p.lead { color: var(--c-ash-light); font-size: 1.15rem; max-width: 560px; }
.hero-actions { display: flex; gap: 16px; margin-top: 32px; flex-wrap: wrap; }

.hero-stats {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: rgba(255,255,255,0.08);
    margin-top: 72px;
    border: 1px solid rgba(255,255,255,0.08);
}
.hero-stats div { background: var(--c-black); padding: 22px 20px; }
.hero-stats .num { font-family: var(--font-display); font-size: 1.9rem; color: var(--c-orange); font-weight: 700; }
.hero-stats .label { font-size: 0.8rem; color: var(--c-ash-light); margin-top: 4px; }

@media (max-width: 760px) {
    .hero-stats { grid-template-columns: repeat(2, 1fr); }
}

/* ==========================================================================
   Sections
   ========================================================================== */
.section { padding: 96px 0; }
.section-dark { background: var(--c-black); color: var(--c-white); }
.section-alt { background: var(--c-white); }
.section-head { max-width: 640px; margin-bottom: 56px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

/* Service cards */
.service-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1px; background: var(--c-ash-light); border: 1px solid var(--c-ash-light); }
.service-card {
    background: var(--c-white);
    padding: 32px 28px;
    transition: background var(--transition);
}
.service-card:hover { background: var(--c-offwhite); }
.service-card .icon-wrap {
    width: 46px; height: 46px;
    border-radius: var(--radius);
    background: rgba(232,106,23,0.1);
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 20px;
}
.service-card .icon { width: 22px; height: 22px; color: var(--c-orange); }
.service-card h3 { margin-bottom: 8px; }
.service-card p { color: var(--c-ash); font-size: 0.92rem; margin-bottom: 16px; }
.service-card a.learn { font-size: 0.85rem; font-weight: 600; color: var(--c-orange); display: inline-flex; align-items: center; gap: 6px; }

/* Category tabs on services page */
.cat-block { margin-bottom: 64px; }
.cat-block h2 { display: flex; align-items: baseline; gap: 14px; }
.cat-block h2 .count { font-family: var(--font-mono); font-size: 0.9rem; color: var(--c-ash); font-weight: 400; }

/* Cards - generic */
.card-dark {
    background: var(--c-steel);
    border: 1px solid var(--c-steel-2);
    border-radius: var(--radius);
    padding: 28px;
}

/* Project / portfolio */
.project-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 28px; }
.project-card { border-radius: var(--radius); overflow: hidden; background: var(--c-white); border: 1px solid var(--c-ash-light); transition: transform var(--transition), box-shadow var(--transition); }
.project-card:hover { transform: translateY(-4px); box-shadow: 0 16px 32px rgba(0,0,0,0.08); }
.project-card .thumb { height: 190px; background: linear-gradient(135deg, var(--c-steel), var(--c-black)); position: relative; display:flex; align-items:center; justify-content:center; }
.project-card .thumb .icon { width: 40px; height: 40px; color: var(--c-orange); opacity: 0.8; }
.project-card .body { padding: 22px 24px; }
.project-card .tag { font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--c-orange); }
.project-card h3 { margin: 8px 0 6px; font-size: 1.1rem; }
.project-card p { color: var(--c-ash); font-size: 0.9rem; margin-bottom: 0; }

/* Testimonials */
.testimonial-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.testimonial { background: var(--c-white); border: 1px solid var(--c-ash-light); border-radius: var(--radius); padding: 28px; }
.testimonial .stars { color: var(--c-orange); font-size: 0.9rem; margin-bottom: 12px; letter-spacing: 2px; }
.testimonial .who { margin-top: 16px; font-size: 0.85rem; color: var(--c-ash); font-weight: 600; }

/* Stats/why-us */
.why-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 32px; }
.why-item .num { font-family: var(--font-display); font-size: 2.2rem; color: var(--c-orange); font-weight: 700; }

/* CTA band */
.cta-band {
    background: var(--c-orange);
    color: var(--c-black);
    padding: 64px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.cta-band h2 { color: var(--c-black); margin-bottom: 20px; }
.cta-band .btn-primary { background: var(--c-black); color: var(--c-white); }
.cta-band .btn-primary:hover { background: var(--c-steel); }

/* Forms */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { margin-bottom: 20px; grid-column: span 2; }
.form-group.half { grid-column: span 1; }
label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; }
input, textarea, select {
    width: 100%;
    padding: 13px 14px;
    border: 1px solid var(--c-ash-light);
    border-radius: var(--radius);
    font-family: var(--font-body);
    font-size: 0.95rem;
    background: var(--c-white);
    color: var(--c-black);
    transition: border-color var(--transition);
}
input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--c-orange);
}
textarea { resize: vertical; min-height: 130px; }

@media (max-width: 700px) {
    .form-grid { grid-template-columns: 1fr; }
    .form-group, .form-group.half { grid-column: span 1; }
}

.alert { padding: 16px 18px; border-radius: var(--radius); margin-bottom: 24px; font-size: 0.92rem; }
.alert-success { background: rgba(46,158,91,0.12); color: var(--c-success); border: 1px solid rgba(46,158,91,0.3); }
.alert-error { background: rgba(214,69,69,0.1); color: var(--c-danger); border: 1px solid rgba(214,69,69,0.3); }

/* Contact info blocks */
.contact-info-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px,1fr)); gap: 24px; margin-top: 40px; }
.contact-info-item { border-left: 2px solid var(--c-orange); padding-left: 16px; }
.contact-info-item .label { font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--c-ash); }
.contact-info-item .value { font-weight: 600; margin-top: 4px; }

/* Breadcrumb */
.breadcrumb { font-size: 0.85rem; color: var(--c-ash); margin-bottom: 20px; font-family: var(--font-mono); }
.breadcrumb a { color: var(--c-ash); }
.breadcrumb a:hover { color: var(--c-orange); }

/* Footer */
.site-footer { background: var(--c-black); color: var(--c-ash-light); padding: 72px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 56px; }
.footer-grid h4 { color: var(--c-white); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.08em; font-family: var(--font-mono); font-weight: 500; margin-bottom: 18px; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { margin-bottom: 10px; }
.footer-grid a { color: var(--c-ash-light); font-size: 0.9rem; transition: color var(--transition); }
.footer-grid a:hover { color: var(--c-orange); }
.footer-brand p { color: var(--c-ash); font-size: 0.9rem; max-width: 320px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 24px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 0.82rem; color: var(--c-ash); }

@media (max-width: 800px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* Utility */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
@media (max-width: 800px) { .grid-2 { grid-template-columns: 1fr; } }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    * { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}

/* Focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
    outline: 2px solid var(--c-orange);
    outline-offset: 2px;
}