:root {
    /* Color system — refined consultant dark */
    --primary-bg: #0f1623;
    --secondary-bg: #161f30;
    --surface-bg: #1c2638;
    --border-color: #2a3548;
    --border-strong: #3a475d;

    --text-primary: #f4f6fa;
    --text-secondary: #c9d1de;
    --text-muted: #8a96aa;

    --accent: #1e9bd7;
    --accent-bright: #3eb5ee;
    --accent-soft: rgba(30, 155, 215, 0.12);

    --warm: #d4a056;
    --warm-bright: #e6b876;

    --max-width: 1200px;

    /* Type scale */
    --font-display: 'Source Serif 4', 'Source Serif Pro', Georgia, 'Times New Roman', serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing */
    --section-padding: 6rem 1.25rem;
    --section-padding-sm: 4rem 1.25rem;
}

/* Base */
* { box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--primary-bg);
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.65;
    padding-top: 72px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;

    /* Subtle texture so the dark surface has atmosphere instead of feeling flat */
    background-image:
        radial-gradient(ellipse at top left, rgba(30, 155, 215, 0.06), transparent 50%),
        radial-gradient(ellipse at bottom right, rgba(212, 160, 86, 0.04), transparent 50%);
    background-attachment: fixed;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--accent);
    color: #fff;
    padding: 0.5rem 1rem;
    z-index: 200;
}
.skip-link:focus { top: 0; }

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    color: var(--text-primary);
    font-weight: 600;
    letter-spacing: -0.015em;
    line-height: 1.15;
    margin: 0 0 1rem;
}

h1 {
    font-size: clamp(2.4rem, 5vw, 3.6rem);
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(1.85rem, 3.5vw, 2.6rem);
    margin-bottom: 1.25rem;
}

h3 {
    font-size: 1.2rem;
    font-weight: 600;
}

p { margin: 0 0 1rem; }

.accent-text {
    color: var(--accent-bright);
    font-style: italic;
    font-weight: 400;
}

.eyebrow {
    font-family: var(--font-body);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--warm);
    margin: 0 0 0.85rem;
}

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

.section-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 65ch;
    margin: 0 0 2.5rem;
    line-height: 1.6;
}

/* Navigation */
.navbar {
    background-color: rgba(15, 22, 35, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    width: 100%;
    padding: 0.9rem 0;
    z-index: 50;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
}

.nav-links {
    display: flex;
    gap: 1.75rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s;
    position: relative;
    padding: 0.25rem 0;
}

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

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

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
}

/* Mobile nav toggle */
.nav-toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    width: 42px;
    height: 42px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    padding: 0;
}

.nav-toggle-bar {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-secondary);
    border-radius: 1px;
    transition: transform 0.25s, opacity 0.25s;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 900px) {
    .nav-toggle { display: flex; }

    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--secondary-bg);
        border-bottom: 1px solid var(--border-color);
        gap: 0;
        padding: 0.5rem 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }

    .nav-links.open {
        max-height: 500px;
    }

    .nav-links li {
        border-top: 1px solid var(--border-color);
    }

    .nav-links a {
        display: block;
        padding: 0.9rem 1.5rem;
    }
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    flex-shrink: 0;
}

.logo-text {
    font-family: var(--font-body);
    font-size: 1.85rem;
    font-weight: 700;
    line-height: 1;
    letter-spacing: -0.04em;
}

.logo-main {
    color: var(--text-primary);
    font-weight: 600;
}

.logo-ai {
    color: var(--accent-bright);
    font-weight: 800;
    margin-left: 0.04em;
}

.logo-text-sm { font-size: 1.4rem; }

/* Sections */
.section {
    padding: var(--section-padding);
}

.section-hero {
    padding: 5rem 1.25rem 6rem;
}

.divider {
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border-color) 20%, var(--border-color) 80%, transparent);
    max-width: 1100px;
    margin: 0 auto;
}

/* Hero */
.hero-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-copy h1 {
    margin-bottom: 1.5rem;
}

.hero-sub {
    font-size: 1.2rem;
    color: var(--text-secondary);
    line-height: 1.55;
    margin-bottom: 1.25rem;
    max-width: 38ch;
}

.tagline {
    font-family: var(--font-display);
    font-style: italic;
    font-size: 1.15rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.hero-ctas {
    display: flex;
    gap: 0.85rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.hero-credibility {
    font-size: 0.92rem;
    color: var(--text-muted);
    margin: 0;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    max-width: 50ch;
}

/* Hero portrait */
.hero-portrait {
    display: flex;
    justify-content: center;
}

.portrait-frame {
    position: relative;
    width: 100%;
    max-width: 360px;
    aspect-ratio: 4 / 5;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-strong);
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.04) inset,
        0 30px 60px -20px rgba(0, 0, 0, 0.5);
}

.portrait-frame::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 60%, rgba(30, 155, 215, 0.08));
    pointer-events: none;
}

.portrait-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

@media (max-width: 860px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
    .hero-portrait { order: -1; }
    .portrait-frame { max-width: 260px; }
    .hero-sub { max-width: none; }
}

/* About */
.about-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about-copy p {
    color: var(--text-secondary);
    margin-bottom: 1.1rem;
}

.about-credentials {
    background: var(--surface-bg);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--warm);
    border-radius: 6px;
    padding: 1.75rem;
    position: sticky;
    top: 100px;
}

.about-credentials h3 {
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--warm);
    margin-bottom: 1rem;
}

.credentials-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.credentials-list li {
    padding: 0.65rem 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.98rem;
    color: var(--text-secondary);
}

.credentials-list li:last-child { border-bottom: none; }

.credentials-list strong {
    color: var(--text-primary);
    font-weight: 600;
}

@media (max-width: 860px) {
    .about-grid { grid-template-columns: 1fr; gap: 2rem; }
    .about-credentials { position: static; }
}

/* Proof / Testimonial strip */
.section-proof { background: var(--secondary-bg); }

.proof-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
    align-items: stretch;
}

.testimonial {
    margin: 0;
    padding: 2rem;
    background: var(--surface-bg);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--accent);
    border-radius: 6px;
    position: relative;
}

.testimonial::before {
    content: '\201C';
    position: absolute;
    top: -10px;
    left: 1.25rem;
    font-family: var(--font-display);
    font-size: 4rem;
    line-height: 1;
    color: var(--accent);
    opacity: 0.4;
}

.testimonial blockquote {
    margin: 0 0 1.25rem;
    padding: 0;
}

.testimonial blockquote p {
    font-family: var(--font-display);
    font-size: 1.15rem;
    line-height: 1.5;
    color: var(--text-primary);
    margin: 0;
    font-style: italic;
}

.testimonial figcaption {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.cite-name {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.95rem;
}

.cite-role {
    color: var(--text-muted);
    font-size: 0.88rem;
}

.case-stat {
    margin: 0;
    padding: 2rem;
    background: var(--surface-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.stat-number {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1;
    color: var(--warm);
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
    margin: 0;
}

@media (max-width: 900px) {
    .proof-grid { grid-template-columns: 1fr; }
}

/* Cards Grid (Use Cases / Examples / Topics) */
.cards-grid,
.examples-grid,
.topics-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
    margin-top: 1rem;
}

@media (min-width: 700px) {
    .cards-grid,
    .examples-grid,
    .topics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .cards-grid,
    .examples-grid,
    .topics-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Card */
.card {
    background-color: var(--surface-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.6rem;
    transition: border-color 0.2s, transform 0.2s;
    position: relative;
}

.card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.85rem;
}

.card-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.card-list {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.card-list li {
    position: relative;
    padding: 0.45rem 0 0.45rem 1.1rem;
    color: var(--text-secondary);
    font-size: 0.97rem;
    line-height: 1.5;
}

.card-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 1rem;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--accent);
}

.card-description {
    color: var(--text-secondary);
    font-size: 0.97rem;
    line-height: 1.55;
    margin: 0;
}

[data-lucide] {
    width: 22px;
    height: 22px;
    stroke: var(--accent-bright);
    stroke-width: 2;
    flex-shrink: 0;
}

/* Buttons */
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.85rem 1.5rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.98rem;
    font-family: var(--font-body);
    letter-spacing: 0.005em;
    transition: all 0.2s;
    border: 1px solid transparent;
    cursor: pointer;
    line-height: 1;
}

.button-primary {
    background-color: var(--accent);
    color: #ffffff;
    box-shadow: 0 1px 0 rgba(255,255,255,0.1) inset, 0 8px 16px -8px rgba(30, 155, 215, 0.5);
}

.button-primary:hover {
    background-color: var(--accent-bright);
    transform: translateY(-1px);
    box-shadow: 0 1px 0 rgba(255,255,255,0.15) inset, 0 12px 20px -8px rgba(30, 155, 215, 0.55);
}

.button-ghost {
    background-color: transparent;
    color: var(--text-primary);
    border-color: var(--border-strong);
}

.button-ghost:hover {
    border-color: var(--accent);
    color: var(--accent-bright);
}

.youtube-button { margin-top: 1.5rem; }

/* Process steps */
.process-steps {
    list-style: none;
    padding: 0;
    margin: 2rem 0 0;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    counter-reset: step;
}

.process-step {
    background: var(--surface-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.75rem;
    position: relative;
}

.step-number {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--warm);
    margin-bottom: 1rem;
    letter-spacing: 0.02em;
}

.process-step h3 {
    margin-bottom: 0.6rem;
    font-size: 1.25rem;
}

.process-step p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.97rem;
    line-height: 1.55;
}

@media (max-width: 860px) {
    .process-steps { grid-template-columns: 1fr; }
}

/* Contact */
.contact-wrap { max-width: 800px; }

.contact-card {
    background-color: var(--surface-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 1rem;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.contact-row {
    display: grid;
    grid-template-columns: 140px 1fr;
    align-items: center;
    gap: 1rem;
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--border-color);
}

.contact-row:last-child { border-bottom: none; }

.contact-label {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.85rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.contact-value {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1rem;
}

a.contact-value {
    color: var(--accent-bright);
    transition: color 0.2s;
}

a.contact-value:hover {
    color: var(--accent);
    text-decoration: underline;
}

.contact-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    padding-top: 0.5rem;
}

.contact-secondary-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.contact-secondary-link:hover { color: var(--accent-bright); }
.contact-secondary-link [data-lucide] { width: 18px; height: 18px; }

@media (max-width: 520px) {
    .contact-row {
        grid-template-columns: 1fr;
        gap: 0.2rem;
    }
}

/* Footer */
.site-footer {
    background-color: var(--secondary-bg);
    border-top: 1px solid var(--border-color);
    padding: 2.5rem 1rem 2rem;
    margin-top: 2rem;
}

.footer-inner {
    display: grid;
    grid-template-columns: 1.5fr 1fr auto;
    gap: 2rem;
    align-items: start;
}

.footer-brand .logo-text {
    display: inline-block;
    margin-bottom: 0.5rem;
}

.footer-tagline {
    font-family: var(--font-display);
    font-style: italic;
    color: var(--text-muted);
    font-size: 0.95rem;
    margin: 0;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.92rem;
    transition: color 0.2s;
}

.footer-links a:hover { color: var(--accent-bright); }

.footer-meta {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-align: right;
}

@media (max-width: 760px) {
    .footer-inner {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    .footer-meta { text-align: left; }
}

/* QR start page (preserved) */
.start-page .section { min-height: auto; }
.start-hero { padding-top: 3rem; }
.start-headline {
    font-size: 3rem;
    line-height: 1.15;
    margin: 0 0 1rem;
    color: var(--text-primary);
}
.start-intro {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin: 0 0 2rem;
    max-width: 60ch;
}
.start-card {
    display: block;
    color: inherit;
    text-decoration: none;
    transition: border-color 0.2s ease, transform 0.2s ease;
}
.start-card:hover {
    border-color: rgba(30, 155, 215, 0.65);
    transform: translateY(-2px);
}
.start-cta { margin-top: 2rem; }
.start-links {
    margin-top: 1.25rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}
.start-links a, .start-footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}
.start-links a:hover, .start-footer-link:hover {
    color: var(--accent-bright);
}

@media (max-width: 768px) {
    .start-headline { font-size: 2.35rem; }
    .start-intro { font-size: 1.1rem; }
    :root {
        --section-padding: 4rem 1.25rem;
    }
}