/* ==========================================================================
   Carbography — design system
   Editorial B2B identity: warm off-white paper, graphite ink, one mineral
   accent (oxide amber), condensed display type, topographic contour motif.
   ========================================================================== */

/* ---- Tokens ---- */
:root {
    /* Surfaces */
    --paper: #FAF6EF;          /* warm off-white */
    --paper-2: #F1EAE0;        /* deeper off-white for alt sections */
    --ink: #16191D;            /* graphite ink — dark sections + headings */
    --ink-2: #21252B;

    /* Text */
    --text: #1A1D21;
    --text-2: #4B5158;
    --muted: #6C727A;

    /* Lines */
    --line: #E5DDCE;
    --line-2: #D5CBB7;
    --line-dark: rgba(235, 230, 219, 0.14);

    /* Accent — muted mineral / oxide amber */
    --accent: #A8531B;
    --accent-strong: #7C3E12;      /* accent for text on light */
    --accent-bright: #E29A5C;      /* accent for text on dark */
    --accent-soft: rgba(168, 83, 27, 0.10);
    --accent-glow: rgba(168, 83, 27, 0.28);

    /* On-dark text */
    --on-dark: #ECE7DD;
    --on-dark-muted: #A6ACB3;

    /* Focus */
    --focus: #A8531B;
    --focus-dark: #E8A668;

    /* Type */
    --font-display: "Barlow Condensed", "Arial Narrow", "Franklin Gothic Medium", sans-serif;
    --font-body: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

    /* Radii / shadows */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --shadow-sm: 0 1px 2px rgba(22, 25, 29, 0.06);
    --shadow-md: 0 6px 20px -6px rgba(22, 25, 29, 0.14);
    --shadow-lg: 0 20px 40px -18px rgba(22, 25, 29, 0.28);

    /* Motion */
    --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html {
    -webkit-text-size-adjust: 100%;
    scroll-padding-top: 84px;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.65;
    color: var(--text);
    background: var(--paper);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }
img { height: auto; }

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.05;
    letter-spacing: -0.01em;
    color: var(--ink);
    text-wrap: balance;
}

p { text-wrap: pretty; }

a { color: inherit; }

ul { list-style: none; }

/* Visible focus everywhere */
:focus-visible {
    outline: 3px solid var(--focus);
    outline-offset: 3px;
    border-radius: 2px;
}
.is-dark :focus-visible {
    outline-color: var(--focus-dark);
}

/* Screen-reader only */
.sr-only {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

/* Skip link */
.skip-link {
    position: absolute;
    left: 16px;
    top: -100px;
    z-index: 2000;
    padding: 12px 20px;
    background: var(--ink);
    color: var(--paper);
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    transition: top 0.2s var(--ease);
}
.skip-link:focus {
    top: 16px;
}

/* ---- Layout ---- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
@media (min-width: 760px) {
    .container { padding: 0 32px; }
}
@media (min-width: 1200px) {
    .container { padding: 0 40px; }
}

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.95rem;
    line-height: 1;
    letter-spacing: 0.01em;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.18s var(--ease), color 0.18s var(--ease),
                border-color 0.18s var(--ease), transform 0.18s var(--ease);
    white-space: nowrap;
}

.btn-sm { padding: 10px 18px; font-size: 0.875rem; }
.btn-lg { padding: 16px 28px; font-size: 1rem; }
.btn-full { width: 100%; }

.btn-primary {
    background: var(--accent);
    color: var(--paper);
}
.btn-primary:hover {
    background: var(--accent-strong);
}
.btn-primary:active {
    transform: translateY(1px);
}

.btn-ghost {
    background: transparent;
    color: var(--ink);
    border-color: var(--line-2);
}
.btn-ghost:hover {
    border-color: var(--ink);
    background: rgba(22, 25, 29, 0.04);
    color: var(--ink);
}

.btn-outline {
    background: transparent;
    color: var(--ink);
    border-color: var(--line-2);
}
.btn-outline:hover {
    border-color: var(--ink);
}

/* Content links (light sections) */
.section a:not(.btn) {
    color: var(--accent-strong);
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-color: rgba(124, 62, 18, 0.32);
    transition: text-decoration-color 0.15s var(--ease), color 0.15s var(--ease);
}
.section a:not(.btn):hover {
    text-decoration-color: var(--accent-strong);
}

/* ---- Navbar ---- */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(22, 25, 29, 0.86);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line-dark);
}
.navbar.scrolled {
    background: rgba(22, 25, 29, 0.97);
    box-shadow: 0 8px 24px -18px rgba(0, 0, 0, 0.8);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
    gap: 16px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--on-dark);
    text-decoration: none;
    line-height: 1;
}
.brand-mark {
    width: 34px;
    height: 34px;
    flex: none;
}
.brand-mark .mark-base { fill: currentColor; }
.brand-mark .mark-top { fill: var(--accent-bright); }
.brand-word {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.35rem;
    letter-spacing: 0.08em;
    color: var(--on-dark);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
}
.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--on-dark-muted);
    transition: color 0.15s var(--ease);
    text-decoration: none;
}
.nav-links a:hover { color: #fff; }
.nav-links .btn-primary { color: var(--paper); }
.nav-links .btn-primary:hover { color: var(--paper); }

.mobile-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: 10px;
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
}
.mobile-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--on-dark);
    border-radius: 2px;
    transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}
.mobile-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- Hero ---- */
.hero {
    position: relative;
    overflow: hidden;
    background: var(--paper);
    color: var(--ink);
    padding: 128px 0 72px;
}
.hero .hero-eyebrow { color: var(--accent-strong); }
.hero .hero-eyebrow::before { background: var(--accent-strong); }
.hero h1 { color: var(--ink); }
.hero-container {
    position: relative;
    z-index: 2;
}
.hero-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 48px;
    align-items: center;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 22px;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-body);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent-bright);
}
.hero-eyebrow::before {
    content: "";
    width: 34px;
    height: 1px;
    background: var(--accent-bright);
}

.hero-headline {
    margin: 0;
    font-size: clamp(2.4rem, 7.5vw, 4.4rem);
    font-weight: 600;
    line-height: 0.98;
    letter-spacing: -0.015em;
    color: var(--ink);
    max-width: 15ch;
}
.hero-headline-main {
    display: block;
}

.hero-lede {
    font-size: 1.06rem;
    line-height: 1.7;
    color: var(--text-2);
    max-width: 54ch;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 4px;
}

.hero-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 18px;
    padding-top: 18px;
    border-top: 1px solid var(--line-2);
    font-size: 0.82rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--text-2);
}
.hero-meta::before {
    content: "";
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--accent);
    flex: none;
}

/* Hero visual — industrial illustration and service sequence */
.hero-visual { position: relative; }

.hero-visual-frame {
    position: relative;
    background: #fff;
    border: 1px solid var(--line-2);
    border-radius: var(--radius-md);
    padding: 12px;
    box-shadow: var(--shadow-sm);
}
.hero-illustration {
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
}
.hero-visual-caption {
    margin-top: 12px;
    padding: 0 4px 2px;
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    color: var(--text-2);
}
.hero-steps {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 20px;
    border-top: 1px solid var(--line-2);
    border-bottom: 1px solid var(--line-2);
}
.hero-step {
    display: grid;
    justify-items: center;
    align-content: center;
    gap: 8px;
    min-height: 88px;
    color: var(--ink);
    font-size: 0.74rem;
    font-weight: 700;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}
.hero-step + .hero-step {
    border-left: 1px solid var(--line-2);
}
.hero-step svg {
    width: 23px;
    height: 23px;
    fill: none;
    stroke: var(--accent-strong);
    stroke-width: 1.6;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* Contour motif */
.hero-contours {
    position: absolute;
    right: -120px;
    bottom: -40px;
    width: 620px;
    height: 620px;
    opacity: 0.5;
    pointer-events: none;
    z-index: 1;
}
.hero-contours path {
    fill: none;
    stroke: var(--accent);
    stroke-width: 1;
    opacity: 0.22;
}

/* ---- Sections (shared) ---- */
.section { padding: 72px 0; }
.section-alt { background: var(--paper-2); }

.section-header {
    max-width: 680px;
    margin: 0 auto 48px;
    text-align: center;
}
.section-header.text-left { margin-left: 0; text-align: left; }

.section-label {
    display: inline-block;
    margin-bottom: 14px;
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent-strong);
}
.section-label::before {
    content: "";
    display: inline-block;
    width: 26px;
    height: 2px;
    background: var(--accent);
    vertical-align: middle;
    margin-right: 10px;
}
.section-header h2 {
    font-size: clamp(2rem, 4.6vw, 3rem);
    margin-bottom: 16px;
    color: var(--ink);
}
.section-subtitle {
    font-size: 1.06rem;
    line-height: 1.7;
    color: var(--text-2);
}

/* ---- CBAM explainer ---- */
.explainer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}
.explainer-col {
    background: var(--paper);
    border: 1px solid var(--line);
    border-top: 3px solid var(--accent);
    border-radius: var(--radius-md);
    padding: 28px 26px;
}
.explainer-col h3 {
    font-size: 1.35rem;
    margin-bottom: 14px;
    color: var(--ink);
}
.explainer-col p {
    font-size: 0.96rem;
    line-height: 1.7;
    color: var(--text-2);
    margin-bottom: 12px;
}
.explainer-col p:last-child { margin-bottom: 0; }

.explainer-col ul.roles { display: grid; gap: 14px; }
.explainer-col ul.roles li {
    font-size: 0.94rem;
    line-height: 1.65;
    color: var(--text-2);
    padding-left: 18px;
    position: relative;
}
.explainer-col ul.roles li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.62em;
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--accent);
}
.explainer-col ul.roles strong { color: var(--text); font-weight: 600; }

.sector-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px 16px;
    margin-bottom: 18px;
}
.sector-list li {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    color: var(--ink);
    padding: 8px 0;
    border-bottom: 1px solid var(--line);
}
.sector-list li:nth-child(1),
.sector-list li:nth-child(2) {
    color: var(--accent-strong);
    font-weight: 600;
}
.explainer-note {
    font-size: 0.86rem !important;
    line-height: 1.6 !important;
    color: var(--muted) !important;
}

/* ---- About ---- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
}
.about-card {
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 28px 26px;
}
.about-card-main {
    grid-column: 1 / -1;
    background: var(--ink);
    color: var(--on-dark);
    border-color: transparent;
    border-left: 4px solid var(--accent);
}
.about-card-main h3 {
    font-size: 1.5rem;
    color: var(--paper);
    margin-bottom: 16px;
}
.about-card-main p {
    color: var(--on-dark);
    line-height: 1.8;
    margin-bottom: 12px;
}
.about-card-main p:last-child { margin-bottom: 0; }
.about-card-main strong { color: var(--accent-bright); font-weight: 600; }

.about-icon {
    width: 42px; height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    margin-bottom: 16px;
}
.about-icon svg { width: 26px; height: 26px; stroke-width: 1.5; }
.about-card h4 {
    font-family: var(--font-body);
    font-size: 1.06rem;
    font-weight: 700;
    color: var(--ink);
    margin-bottom: 8px;
}
.about-card > p {
    color: var(--text-2);
    font-size: 0.94rem;
    line-height: 1.65;
}

/* ---- Services ---- */
.services-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
}
.service-card {
    position: relative;
    background: var(--paper);
    border: 1px solid var(--line);
    border-top: 3px solid var(--accent);
    border-radius: var(--radius-md);
    padding: 30px 26px;
}
.service-card-featured {
    border-color: var(--line-2);
    background: #fffdf8;
}
.service-number {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: 18px;
}
.service-icon-wrap {
    width: 44px; height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    background: var(--accent-soft);
    border-radius: var(--radius-sm);
    margin-bottom: 18px;
}
.service-icon-wrap svg { width: 24px; height: 24px; }
.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
    color: var(--ink);
}
.service-card > p {
    color: var(--text-2);
    font-size: 0.98rem;
    line-height: 1.7;
    margin-bottom: 22px;
}
.service-list {
    padding-top: 20px;
    border-top: 1px solid var(--line);
    display: grid;
    gap: 10px;
}
.service-list li {
    position: relative;
    padding-left: 20px;
    font-size: 0.93rem;
    line-height: 1.55;
    color: var(--text);
}
.service-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--accent);
}
.services-note {
    margin-top: 26px;
    padding: 18px 20px;
    background: var(--accent-soft);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    line-height: 1.65;
    color: var(--text-2);
}

/* ---- Process ---- */
.process-timeline {
    max-width: 720px;
    margin: 0 auto;
    position: relative;
}
.process-timeline::before {
    content: "";
    position: absolute;
    left: 26px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: var(--line-2);
}
.process-step {
    display: flex;
    gap: 22px;
    padding: 16px 0;
}
.process-step-number {
    width: 52px; height: 52px;
    flex: none;
    border-radius: 50%;
    background: var(--ink);
    color: var(--paper);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    position: relative;
    z-index: 1;
}
.process-step-content { padding-top: 2px; }
.process-step-content h4 {
    font-family: var(--font-body);
    font-size: 1.08rem;
    font-weight: 700;
    color: var(--ink);
    margin-bottom: 6px;
}
.process-step-content p {
    color: var(--text-2);
    font-size: 0.95rem;
    line-height: 1.65;
}

/* ---- CTA banner ---- */
.cta-banner {
    position: relative;
    overflow: hidden;
    background: var(--ink);
    color: var(--on-dark);
    padding: 72px 0;
}
.cta-banner-content {
    position: relative;
    z-index: 2;
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
}
.cta-banner-content h2 {
    color: var(--paper);
    font-size: clamp(1.9rem, 4.4vw, 2.8rem);
    margin-bottom: 16px;
}
.cta-banner-content p {
    font-size: 1.04rem;
    line-height: 1.7;
    color: var(--on-dark-muted);
    margin-bottom: 28px;
}
.cta-contours {
    position: absolute;
    left: -80px;
    bottom: -120px;
    width: 560px;
    height: 560px;
    opacity: 0.5;
    pointer-events: none;
    z-index: 1;
}
.cta-contours path {
    fill: none;
    stroke: var(--accent);
    stroke-width: 1;
    opacity: 0.22;
}

/* ---- FAQ ---- */
.faq-container { max-width: 820px; margin: 0 auto; }
.faq-category { margin-bottom: 44px; }
.faq-category:last-child { margin-bottom: 0; }

.faq-category-title {
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent-strong);
    padding-bottom: 12px;
    border-bottom: 2px solid var(--accent);
    margin-bottom: 4px;
}

.faq-item { border-bottom: 1px solid var(--line); }

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 20px 0;
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 1.03rem;
    font-weight: 600;
    color: var(--ink);
    text-align: left;
    line-height: 1.4;
}
.faq-question:hover { color: var(--accent-strong); }

.faq-icon {
    width: 30px; height: 30px;
    flex: none;
    border-radius: 50%;
    background: var(--paper-2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 400;
    line-height: 1;
    color: var(--accent-strong);
    transition: transform 0.2s var(--ease), background-color 0.2s var(--ease);
}
.faq-item.open .faq-icon {
    background: var(--accent);
    color: var(--paper);
    transform: rotate(45deg);
}

.faq-answer {
    display: none;
    padding: 0 0 24px;
}
.faq-item.open .faq-answer {
    display: block;
}
.faq-answer p {
    color: var(--text);
    line-height: 1.75;
    margin-bottom: 12px;
    font-size: 0.95rem;
}
.faq-answer p:last-child { margin-bottom: 0; }
.faq-answer ul {
    margin: 12px 0;
    padding-left: 0;
}
.faq-answer ul li {
    position: relative;
    padding: 6px 0 6px 18px;
    color: var(--text);
    font-size: 0.95rem;
    line-height: 1.65;
}
.faq-answer ul li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.72em;
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--accent);
}
.faq-answer strong { color: var(--ink); }

.faq-disclaimer {
    margin-top: 32px;
    padding-top: 20px;
    border-top: 1px solid var(--line);
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--muted);
    text-align: center;
}

/* ---- Contact ---- */
.contact-layout {
    max-width: 760px;
    margin: 0 auto;
    text-align: center;
}
.contact-info h2 {
    font-size: clamp(1.9rem, 4vw, 2.6rem);
    margin-bottom: 16px;
    color: var(--ink);
}
.contact-info > p {
    color: var(--text-2);
    line-height: 1.7;
    margin: 0 auto 28px;
    max-width: 58ch;
}
.contact-note {
    margin-top: 18px !important;
    font-size: 0.86rem;
    color: var(--muted) !important;
}

/* ---- Footer ---- */
.footer {
    background: var(--ink);
    color: var(--on-dark-muted);
    padding: 56px 0 28px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 36px;
    margin-bottom: 44px;
}
.footer-brand .brand { margin-bottom: 16px; }
.footer-strapline {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent-bright);
    margin-bottom: 10px;
}
.footer-brand > p {
    font-size: 0.9rem;
    line-height: 1.65;
    color: var(--on-dark-muted);
    max-width: 360px;
}
.footer-links h4 {
    font-family: var(--font-body);
    font-size: 0.74rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: rgba(235, 230, 219, 0.5);
    margin-bottom: 16px;
}
.footer-links li { margin-bottom: 10px; }
.footer-links a {
    font-size: 0.9rem;
    color: var(--on-dark-muted);
    text-decoration: none;
    transition: color 0.15s var(--ease);
}
.footer-links a:hover { color: #fff; }
.footer-links a[target="_blank"]::after {
    content: " ↗";
    font-size: 0.75em;
    opacity: 0.6;
}

.footer-bottom {
    border-top: 1px solid var(--line-dark);
    padding-top: 22px;
    font-size: 0.8rem;
    line-height: 1.65;
    color: rgba(235, 230, 219, 0.55);
    display: grid;
    gap: 10px;
}

/* ---- Motion preferences ---- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
}

/* ==========================================================================
   Responsive (mobile-first enhancements)
   ========================================================================== */
@media (min-width: 640px) {
    .form-row {
        grid-template-columns: 1fr 1fr;
        gap: 16px;
    }
    .about-grid { grid-template-columns: 1fr 1fr; }
    .services-grid { grid-template-columns: 1fr 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .sector-list { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 900px) {
    .section { padding: 96px 0; }

    .hero { padding: 168px 0 96px; }
    .hero-grid {
        grid-template-columns: 1.05fr 0.95fr;
        gap: 64px;
    }

    .explainer-grid { grid-template-columns: 1fr 1fr 1fr; }
    .services-grid { grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
}

@media (max-width: 899px) {
    /* Mobile navigation */
    .mobile-toggle { display: flex; }
    .nav-links {
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 8px 20px 20px;
        background: var(--ink);
        border-bottom: 1px solid var(--line-dark);
        box-shadow: 0 24px 40px -24px rgba(0, 0, 0, 0.7);
    }
    .nav-links.open { display: flex; }
    .nav-links a {
        padding: 14px 4px;
        font-size: 1rem;
        border-bottom: 1px solid var(--line-dark);
    }
    .nav-links a.btn {
        margin-top: 16px;
        border-bottom: none;
        justify-content: center;
    }
}