/* ==========================================
   BOLT AI - MAIN STYLESHEET
   Modern design system — Inter, light surfaces, tech-forward
   ========================================== */

/* ==========================================
   VARIABLES
   ========================================== */
:root {
    /* Core palette */
    --color-dark: #0A1628;
    --color-core: #0B2642;
    --color-coral: #FF5050;
    --color-coral-dim: rgba(255, 80, 80, 0.08);
    --color-electric: #00D4FF;
    --color-electric-dim: rgba(0, 212, 255, 0.08);
    --color-electric-glow: rgba(0, 212, 255, 0.15);

    /* Modern surface colours */
    --color-surface: #FAFBFC;
    --color-surface-raised: #FFFFFF;
    --color-surface-dark: #0D1B2A;
    --color-surface-dark-raised: rgba(255, 255, 255, 0.03);
    --color-border: rgba(10, 22, 40, 0.06);
    --color-border-dark: rgba(255, 255, 255, 0.08);

    /* Legacy compat (used by existing page-specific styles) */
    --color-white: #FFFFFF;
    --color-cream: #FAFBFC;
    --color-white-80: rgba(255,255,255,0.8);
    --color-white-60: rgba(255,255,255,0.6);
    --color-white-40: rgba(255,255,255,0.4);
    --color-white-10: rgba(255,255,255,0.1);
    --color-white-05: rgba(255,255,255,0.05);
    --color-dark-10: rgba(10, 22, 40, 0.1);
    --color-dark-60: rgba(10, 22, 40, 0.6);
    --color-dark-80: rgba(10, 22, 40, 0.8);
    --color-coral-hover: #FF6B6B;
    --color-electric-dim-legacy: rgba(0, 212, 255, 0.15);

    /* Text colours */
    --color-text-primary: #0A1628;
    --color-text-secondary: #475569;
    --color-text-tertiary: #94A3B8;
    --color-text-on-dark: #F1F5F9;
    --color-text-on-dark-secondary: rgba(255, 255, 255, 0.6);

    /* Gradients */
    --gradient-hero: linear-gradient(135deg, #0A1628 0%, #0B2642 40%, #0F2D4F 100%);
    --gradient-glow: radial-gradient(ellipse at 50% 0%, rgba(0, 212, 255, 0.12) 0%, transparent 60%);
    --gradient-coral-glow: radial-gradient(ellipse at 50% 50%, rgba(255, 80, 80, 0.08) 0%, transparent 60%);
    --gradient-mesh: radial-gradient(at 20% 20%, rgba(0, 212, 255, 0.06) 0%, transparent 50%),
                     radial-gradient(at 80% 60%, rgba(255, 80, 80, 0.04) 0%, transparent 50%),
                     radial-gradient(at 50% 100%, rgba(0, 212, 255, 0.04) 0%, transparent 50%);

    /* Typography */
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-editorial: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 5rem;
    --space-3xl: 8rem;
    --space-xxl: 5rem;

    /* Layout */
    --max-width: 1200px;
    --max-width-narrow: 800px;
    --section-padding: clamp(4rem, 8vw, 8rem) clamp(1.5rem, 5vw, 3rem);

    /* Motion */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
    --duration-fast: 150ms;
    --duration-normal: 300ms;
    --duration-slow: 600ms;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(10, 22, 40, 0.04);
    --shadow-md: 0 4px 12px rgba(10, 22, 40, 0.06);
    --shadow-lg: 0 8px 30px rgba(10, 22, 40, 0.08);
    --shadow-glow-electric: 0 0 40px rgba(0, 212, 255, 0.15);
    --shadow-glow-coral: 0 0 40px rgba(255, 80, 80, 0.10);

    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background: var(--color-surface);
    color: var(--color-text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
    font-size: 16px;
}

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

img {
    max-width: 100%;
    height: auto;
}

/* ==========================================
   TYPOGRAPHY
   ========================================== */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    line-height: 1.15;
    font-weight: 800;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
}

h2 {
    font-size: clamp(1.8rem, 3.5vw, 2.8rem);
    font-weight: 700;
    letter-spacing: -0.02em;
}

h3 {
    font-size: clamp(1.25rem, 2vw, 1.5rem);
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.01em;
}

p {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
    max-width: 65ch;
}

.lead {
    font-size: clamp(1.1rem, 1.5vw, 1.25rem);
    line-height: 1.7;
    color: var(--color-text-on-dark-secondary);
    max-width: 55ch;
}

/* ==========================================
   LAYOUT
   ========================================== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.section {
    padding: var(--section-padding);
    position: relative;
}

.section__inner {
    max-width: var(--max-width);
    margin: 0 auto;
}

.section__inner--narrow {
    max-width: var(--max-width-narrow);
}

.section--dark {
    background: var(--color-surface-dark);
    color: var(--color-text-on-dark);
}

.section--dark p {
    color: var(--color-text-on-dark-secondary);
}

.section--surface {
    background: var(--color-surface);
}

.section--mesh {
    background: var(--color-surface);
    background-image: var(--gradient-mesh);
}

.section--cream {
    background: var(--color-surface);
    background-image: var(--gradient-mesh);
    color: var(--color-text-primary);
}

.section--gradient {
    background: var(--gradient-hero);
}

.section--problem {
    background: var(--color-surface);
    background-image: var(--gradient-mesh);
    padding: var(--section-padding);
}

.section--cta {
    background: var(--gradient-hero);
    position: relative;
    text-align: center;
    overflow: hidden;
}

.section--cta::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 150%;
    height: 100%;
    background: radial-gradient(ellipse at center, rgba(255, 80, 80, 0.1) 0%, transparent 60%);
    pointer-events: none;
}

/* ==========================================
   HEADER
   ========================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: background var(--duration-normal) var(--ease-out),
                border-color var(--duration-normal) var(--ease-out),
                backdrop-filter var(--duration-normal) var(--ease-out);
    background: transparent;
    border-bottom: 1px solid transparent;
}

.header--scrolled {
    background: rgba(250, 251, 252, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--color-border);
}

.header__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.header__logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.header__logo-svg {
    height: 28px;
    width: auto;
}

.header__logo-ai {
    color: var(--color-electric);
}

.header__nav {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.header__link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-on-dark-secondary);
    text-decoration: none;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    transition: color var(--duration-fast), background var(--duration-fast);
}

.header--scrolled .header__link {
    color: var(--color-text-secondary);
}

.header__link:hover {
    color: var(--color-text-on-dark);
    background: rgba(255, 255, 255, 0.08);
}

.header--scrolled .header__link:hover {
    color: var(--color-text-primary);
    background: rgba(10, 22, 40, 0.04);
}

.header__link--active {
    color: var(--color-text-on-dark);
}

.header--scrolled .header__link--active {
    color: var(--color-text-primary);
}

.header__cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.6rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-surface-raised);
    background: var(--color-coral);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all var(--duration-normal) var(--ease-out);
    box-shadow: 0 2px 8px rgba(255, 80, 80, 0.25);
}

.header__cta:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow-coral);
}

.header--scrolled .header__cta {
    color: var(--color-surface-raised);
}

.header__menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.header__menu-line {
    width: 22px;
    height: 2px;
    background: var(--color-white);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.header--scrolled .header__menu-line {
    background: var(--color-text-primary);
}

/* ==========================================
   HERO
   ========================================== */
.hero {
    min-height: 85vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: calc(80px + var(--space-3xl)) clamp(1.5rem, 5vw, 3rem) var(--space-3xl);
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    left: 50%;
    transform: translateX(-50%);
    width: 120%;
    height: 80%;
    background: var(--gradient-glow);
    pointer-events: none;
    z-index: 0;
}

.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 0;
}

.hero__content {
    position: relative;
    z-index: 2;
    max-width: var(--max-width-narrow);
}

.hero h1, .hero__headline {
    color: var(--color-surface-raised);
    margin-bottom: var(--space-lg);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
}

.hero h1 .accent, .hero__headline-highlight {
    background: linear-gradient(135deg, var(--color-electric), #60E0FF);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero .lead, .hero__sub {
    font-size: clamp(1.1rem, 2.5vw, 1.25rem);
    font-weight: 400;
    color: var(--color-text-on-dark-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-xl);
    max-width: 55ch;
    margin-left: auto;
    margin-right: auto;
}

.hero__buttons {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ==========================================
   BUTTONS
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    padding: 0.85rem 1.75rem;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--duration-normal) var(--ease-out);
}

.btn--primary {
    background: var(--color-coral);
    color: var(--color-surface-raised);
    box-shadow: 0 2px 8px rgba(255, 80, 80, 0.25);
}

.btn--primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow-coral);
}

.btn--secondary {
    background: rgba(255, 255, 255, 0.06);
    color: var(--color-text-on-dark);
    border: 1px solid rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(8px);
}

.btn--secondary:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.25);
    transform: translateY(-1px);
}

.btn--electric {
    background: var(--color-electric);
    color: var(--color-dark);
    box-shadow: 0 2px 8px rgba(0, 212, 255, 0.25);
}

.btn--electric:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow-electric);
}

.btn--light {
    background: var(--color-text-primary);
    color: var(--color-surface-raised);
}

.btn--light:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

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

.btn--ghost:hover {
    border-color: var(--color-text-tertiary);
    background: rgba(10, 22, 40, 0.02);
}

.btn svg {
    width: 18px;
    height: 18px;
}

/* ==========================================
   CARDS
   ========================================== */
.card {
    background: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: all var(--duration-normal) var(--ease-out);
}

.card:hover {
    border-color: rgba(0, 212, 255, 0.15);
    box-shadow: var(--shadow-md), 0 0 30px rgba(0, 212, 255, 0.04);
    transform: translateY(-2px);
}

.card--dark {
    background: var(--color-surface-dark-raised);
    border-color: var(--color-border-dark);
}

.card--dark:hover {
    border-color: rgba(0, 212, 255, 0.2);
    box-shadow: 0 0 40px rgba(0, 212, 255, 0.06);
}

.card--dark h3 {
    color: var(--color-text-on-dark);
}

.card--dark p {
    color: var(--color-text-on-dark-secondary);
}

.card h3 {
    margin-bottom: var(--space-sm);
    color: var(--color-text-primary);
}

.card p {
    color: var(--color-text-secondary);
    font-size: 1rem;
}

.card--feature {
    position: relative;
    overflow: hidden;
}

.card--feature::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-electric), var(--color-coral));
    opacity: 0;
    transition: opacity var(--duration-normal) var(--ease-out);
}

.card--feature:hover::before {
    opacity: 1;
}

.card--principle {
    border-left: 3px solid var(--color-electric);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-lg);
}

/* ==========================================
   PROBLEM SECTION (legacy compat)
   ========================================== */
.problem {
    background: var(--color-surface);
    background-image: var(--gradient-mesh);
    color: var(--color-text-primary);
    padding: var(--section-padding);
}

.problem__inner {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.problem__headline {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    margin-bottom: var(--space-lg);
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

.problem__text {
    font-size: 1.15rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
}

.problem__text strong {
    color: var(--color-text-primary);
    font-weight: 700;
}

.problem__cta {
    margin-top: var(--space-lg);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-coral);
}

/* ==========================================
   SERVICES SECTION (legacy compat)
   ========================================== */
.services {
    background: var(--color-surface-dark);
    padding: var(--section-padding);
}

.services__header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-xl);
}

.services__label {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-electric);
    margin-bottom: var(--space-sm);
}

.services__title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    color: var(--color-text-on-dark);
    margin-bottom: var(--space-sm);
    letter-spacing: -0.02em;
}

.services__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.service-card {
    background: var(--color-surface-dark-raised);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: all var(--duration-normal) var(--ease-out);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-electric), var(--color-coral));
    opacity: 0;
    transition: opacity var(--duration-normal) var(--ease-out);
}

.service-card:hover {
    border-color: rgba(0, 212, 255, 0.2);
    box-shadow: 0 0 40px rgba(0, 212, 255, 0.06);
    transform: translateY(-2px);
}

.service-card:hover::before {
    opacity: 1;
}

.service-card__icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--color-electric-dim);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
    color: var(--color-electric);
}

.service-card__icon svg {
    width: 24px;
    height: 24px;
}

.service-card__title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--color-text-on-dark);
    letter-spacing: -0.01em;
}

.service-card__desc {
    font-size: 0.95rem;
    color: var(--color-text-on-dark-secondary);
    line-height: 1.7;
    flex: 1;
}

.service-card__price {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border-dark);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-electric);
}

/* ==========================================
   USE CASES (legacy compat)
   ========================================== */
.use-cases {
    background: var(--color-surface-dark);
    padding: var(--section-padding);
}

.use-cases__header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-xl);
}

.use-cases__title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    color: var(--color-text-on-dark);
    margin-bottom: var(--space-sm);
    letter-spacing: -0.02em;
}

.use-cases__subtitle {
    color: var(--color-text-on-dark-secondary);
    font-size: 1.1rem;
}

.use-cases__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    max-width: 1000px;
    margin: 0 auto;
}

.use-case {
    background: var(--color-surface-dark-raised);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-sm);
    padding: var(--space-md);
    font-size: 0.95rem;
    color: var(--color-text-on-dark-secondary);
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    transition: all var(--duration-normal) var(--ease-out);
}

.use-case:hover {
    border-color: rgba(0, 212, 255, 0.2);
    background: rgba(0, 212, 255, 0.04);
}

.use-case__icon {
    color: var(--color-electric);
    flex-shrink: 0;
    margin-top: 2px;
}

.use-case__icon svg {
    width: 18px;
    height: 18px;
}

/* ==========================================
   DIFFERENTIATORS (legacy compat)
   ========================================== */
.differentiators {
    background: var(--color-surface);
    background-image: var(--gradient-mesh);
    color: var(--color-text-primary);
    padding: var(--section-padding);
}

.differentiators__header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-xl);
}

.differentiators__label {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-coral);
    margin-bottom: var(--space-sm);
}

.differentiators__title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

.differentiators__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.differentiator {
    text-align: center;
}

.differentiator__icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-lg);
    background: var(--color-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-md);
    color: var(--color-electric);
}

.differentiator__icon svg {
    width: 32px;
    height: 32px;
}

.differentiator__title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--color-text-primary);
    letter-spacing: -0.01em;
}

.differentiator__text {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
}

/* ==========================================
   CTA SECTION (legacy compat)
   ========================================== */
.cta-section {
    background: var(--gradient-hero);
    padding: var(--section-padding);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 150%;
    height: 100%;
    background: radial-gradient(ellipse at center, rgba(255, 80, 80, 0.1) 0%, transparent 60%);
    pointer-events: none;
}

.cta-section__inner {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.cta-section__title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    color: var(--color-text-on-dark);
    margin-bottom: var(--space-md);
    letter-spacing: -0.02em;
}

.cta-section__text {
    font-size: 1.1rem;
    color: var(--color-text-on-dark-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.7;
}

.cta-section__price {
    font-size: 0.95rem;
    color: var(--color-electric);
    margin-top: var(--space-md);
    font-weight: 600;
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
    background: var(--color-dark);
    color: var(--color-text-on-dark-secondary);
    padding: var(--space-3xl) clamp(1.5rem, 5vw, 3rem) var(--space-xl);
}

.footer__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-2xl);
}

.footer__brand {
    max-width: 350px;
}

.footer__logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: var(--space-sm);
}

.footer__logo .header__logo-svg {
    height: 24px;
    width: auto;
}

.footer__logo-ai {
    color: var(--color-electric);
}

.footer__tagline {
    font-size: 0.9rem;
    color: var(--color-text-on-dark-secondary);
    margin-bottom: var(--space-md);
    max-width: 35ch;
    margin-top: var(--space-sm);
}

.footer__parent {
    font-size: 0.85rem;
    color: var(--color-text-on-dark-secondary);
}

.footer__parent a {
    color: var(--color-coral);
    transition: color var(--duration-fast);
}

.footer__parent a:hover {
    color: var(--color-coral-hover);
}

.footer__contact {
    text-align: right;
}

.footer__contact-title {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-on-dark-secondary);
    margin-bottom: var(--space-md);
}

.footer__contact-item {
    font-size: 0.9rem;
    color: var(--color-text-on-dark-secondary);
    margin-bottom: var(--space-xs);
    padding: var(--space-xs) 0;
}

.footer__contact-item a {
    transition: color var(--duration-fast);
}

.footer__contact-item a:hover {
    color: var(--color-text-on-dark);
}

.footer__bottom {
    max-width: var(--max-width);
    margin: var(--space-2xl) auto 0;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border-dark);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--color-text-on-dark-secondary);
}

.footer__links {
    display: flex;
    gap: var(--space-md);
}

.footer__links a {
    transition: color var(--duration-fast);
}

.footer__links a:hover {
    color: var(--color-text-on-dark);
}

/* ==========================================
   MOBILE NAV
   ========================================== */
.mobile-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-dark);
    z-index: 2000;
    display: none;
    flex-direction: column;
    padding: var(--space-lg);
}

.mobile-nav.active {
    display: flex;
}

.mobile-nav__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xl);
}

.mobile-nav__logo .header__logo-svg {
    height: 24px;
    width: auto;
}

.mobile-nav__close {
    background: none;
    border: none;
    color: var(--color-white);
    cursor: pointer;
    padding: 8px;
}

.mobile-nav__close svg {
    width: 24px;
    height: 24px;
}

.mobile-nav__links {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.mobile-nav__link {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-on-dark-secondary);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border-dark);
    transition: color var(--duration-fast);
}

.mobile-nav__link:hover {
    color: var(--color-text-on-dark);
}

.mobile-nav__cta {
    margin-top: auto;
}

/* ==========================================
   SCROLL REVEAL
   ========================================== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--duration-slow) var(--ease-out),
                transform var(--duration-slow) var(--ease-out);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal-stagger > .reveal:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger > .reveal:nth-child(2) { transition-delay: 100ms; }
.reveal-stagger > .reveal:nth-child(3) { transition-delay: 200ms; }
.reveal-stagger > .reveal:nth-child(4) { transition-delay: 300ms; }
.reveal-stagger > .reveal:nth-child(5) { transition-delay: 400ms; }
.reveal-stagger > .reveal:nth-child(6) { transition-delay: 500ms; }

@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* ==========================================
   EXAMPLE BLOCKS
   ========================================== */
.example-block {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    margin-top: var(--space-lg);
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    position: relative;
}

.example-block::before {
    content: 'In practice';
    display: block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-electric);
    margin-bottom: var(--space-sm);
}

/* ==========================================
   RESPONSIVE
   ========================================== */
@media (max-width: 900px) {
    .services__grid {
        grid-template-columns: 1fr;
        max-width: 500px;
    }

    .use-cases__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .differentiators__grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        gap: var(--space-xl);
    }
}

@media (max-width: 768px) {
    .header__nav {
        display: none;
    }

    .header__menu-btn {
        display: flex;
    }

    .hero {
        min-height: 70vh;
        padding-top: calc(70px + var(--space-2xl));
    }

    .hero__buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    .use-cases__grid {
        grid-template-columns: 1fr;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }

    .footer__inner {
        flex-direction: column;
        gap: var(--space-xl);
    }

    .footer__contact {
        text-align: left;
    }

    .footer__bottom {
        flex-direction: column;
        gap: var(--space-sm);
        text-align: center;
    }
}

@media (max-width: 480px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }

    .section {
        padding: var(--space-2xl) var(--space-sm);
    }

    .header__inner {
        padding: 0 var(--space-sm);
    }
}