/* ===================================
   CSS Variables - Brand Colors
   =================================== */
:root {
    --color-graphite: #2B2B2B;
    --color-arctic-blue: #2E5AAC;
    --color-ice-white: #F4F6F8;
    --color-industrial-silver: #A0A3A8;
    --color-white: #FFFFFF;
    --color-safety-amber: #E7A33D;

    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    --spacing-xxl: 6rem;

    --container-width: 1200px;
    --border-radius: 4px;
    --transition: all 0.3s ease;
}

/* ===================================
   Reset & Base Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-graphite);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: 2.5rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2rem;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--color-arctic-blue);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--color-graphite);
}

/* ===================================
   Layout Components
   =================================== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-xxl) 0;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.section-light {
    background-color: var(--color-ice-white);
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-xl) auto;
}

.section-title {
    color: var(--color-graphite);
    margin-bottom: var(--spacing-md);
}

.section-intro {
    font-size: 1.25rem;
    color: var(--color-industrial-silver);
    line-height: 1.7;
}

/* ===================================
   Header
   =================================== */
.header {
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-ice-white);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

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

.logo {
    height: 40px;
    width: auto;
}

.header-right {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.language-switcher {
    position: relative;
}

.language-switcher select {
    background-color: var(--color-white);
    color: var(--color-graphite);
    border: 1px solid var(--color-ice-white);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-family: var(--font-primary);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.language-switcher select:hover {
    border-color: var(--color-arctic-blue);
}

.language-switcher select:focus {
    outline: none;
    border-color: var(--color-arctic-blue);
}

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

.nav-link {
    color: var(--color-graphite);
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--color-arctic-blue);
}

.nav-link-cta {
    background-color: var(--color-arctic-blue);
    color: var(--color-white);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
}

.nav-link-cta:hover {
    background-color: var(--color-graphite);
    color: var(--color-white);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    padding: calc(var(--spacing-xxl) * 0.67) 0;
    background-color: var(--color-white);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: calc(var(--spacing-xl) * 0.67);
    align-items: center;
}

.hero-title {
    font-size: 2rem;
    color: var(--color-graphite);
    margin-bottom: calc(var(--spacing-md) * 0.67);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--color-industrial-silver);
    margin-bottom: calc(var(--spacing-md) * 0.67);
    line-height: 1.6;
}

.hero-insight {
    font-size: 1rem;
    color: var(--color-graphite);
    font-weight: 600;
    margin-bottom: calc(var(--spacing-md) * 0.67);
}

.hero-stage {
    font-size: 1rem;
    color: var(--color-arctic-blue);
    font-weight: 600;
    margin-bottom: calc(var(--spacing-lg) * 0.67);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border-radius: var(--border-radius);
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--color-arctic-blue);
    color: var(--color-white);
}

.btn-primary:hover {
    background-color: var(--color-graphite);
    color: var(--color-white);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-graphite);
    border: 2px solid var(--color-graphite);
}

.btn-secondary:hover {
    background-color: var(--color-graphite);
    color: var(--color-white);
}

.btn-large {
    padding: 1.125rem 2.5rem;
    font-size: 1.125rem;
}

/* ===================================
   Image Placeholders
   =================================== */
.img-ph {
    background: linear-gradient(135deg, var(--color-ice-white) 0%, var(--color-industrial-silver) 100%);
    border: 2px dashed var(--color-industrial-silver);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.img-ph::before {
    content: attr(aria-label);
    position: absolute;
    color: var(--color-graphite);
    font-size: 0.875rem;
    text-align: center;
    padding: var(--spacing-md);
    opacity: 0.6;
}

.hero-img {
    width: 100%;
    aspect-ratio: 16 / 9;
}

.hero-img img {
    width: 100%;
    height: auto;
    display: block;
}

/* ===================================
   Problem Section
   =================================== */
.problem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.problem-card {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--color-white);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-ice-white);
    transition: var(--transition);
}

.problem-card:hover {
    border-color: var(--color-arctic-blue);
    box-shadow: 0 4px 12px rgba(46, 90, 172, 0.1);
}

.problem-icon {
    margin-bottom: var(--spacing-md);
    display: flex;
    justify-content: center;
}

.problem-title {
    color: var(--color-graphite);
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.problem-text {
    color: var(--color-industrial-silver);
    line-height: 1.6;
}

.value-prop {
    background-color: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--color-arctic-blue);
}

.value-prop-text {
    font-size: 1.25rem;
    color: var(--color-graphite);
    font-weight: 600;
    margin: 0;
    line-height: 1.6;
}

/* ===================================
   How It Works Section
   =================================== */
.how-it-works-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.how-it-works-img {
    width: 100%;
    aspect-ratio: 16 / 9;
}

.how-step {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.step-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background-color: var(--color-arctic-blue);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
}

.step-content {
    flex: 1;
}

.step-title {
    color: var(--color-graphite);
    margin-bottom: var(--spacing-xs);
    font-size: 1.125rem;
}

.step-text {
    color: var(--color-industrial-silver);
    margin: 0;
}

.how-it-works-footer {
    font-size: 1.25rem;
    color: var(--color-graphite);
    font-weight: 700;
    margin-top: var(--spacing-md);
    margin-bottom: 0;
}

/* ===================================
   What This Enables Section
   =================================== */
.enables-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.enable-card {
    background-color: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-ice-white);
    transition: var(--transition);
}

.enable-card:hover {
    border-color: var(--color-arctic-blue);
    box-shadow: 0 4px 12px rgba(46, 90, 172, 0.1);
}

.enable-title {
    color: var(--color-graphite);
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.enable-text {
    color: var(--color-industrial-silver);
    margin: 0;
}

/* ===================================
   Technical Foundation Section
   =================================== */
.section-trust {
    background-color: var(--color-graphite);
    color: var(--color-white);
}

.trust-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.section-trust .section-title {
    color: var(--color-white);
}

.trust-text {
    font-size: 1.125rem;
    color: var(--color-ice-white);
    line-height: 1.7;
}

/* ===================================
   Partner Section
   =================================== */
.section-partner {
    background-color: var(--color-ice-white);
}

.partner-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.partner-intro {
    font-size: 1.125rem;
    color: var(--color-industrial-silver);
    margin-bottom: var(--spacing-md);
}

.partner-description {
    font-weight: 600;
    color: var(--color-graphite);
    margin-bottom: var(--spacing-sm);
}

.partner-list {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.partner-list li {
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    position: relative;
    color: var(--color-industrial-silver);
}

.partner-list li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-arctic-blue);
    font-weight: 700;
}

.partner-commitment {
    color: var(--color-graphite);
    font-weight: 600;
    margin-top: var(--spacing-md);
}

.partner-img {
    width: 100%;
    aspect-ratio: 16 / 9;
}

/* ===================================
   Contact Section
   =================================== */
.section-contact {
    background-color: var(--color-white);
}

.contact-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.contact-intro {
    font-size: 1.125rem;
    color: var(--color-industrial-silver);
    margin-bottom: var(--spacing-xl);
}

.contact-options {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.contact-option {
    text-align: center;
}

.contact-option-title {
    color: var(--color-graphite);
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.contact-option-text {
    color: var(--color-industrial-silver);
    margin-bottom: var(--spacing-md);
}

.contact-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-industrial-silver);
    font-weight: 600;
    font-size: 1.125rem;
}

.contact-email {
    font-size: 1.5rem;
    color: var(--color-arctic-blue);
    font-weight: 600;
    display: inline-block;
    margin-top: var(--spacing-sm);
}

.contact-email:hover {
    color: var(--color-graphite);
}

.contact-note {
    font-size: 0.875rem;
    color: var(--color-industrial-silver);
    font-style: italic;
    margin-top: var(--spacing-sm);
}

.contact-footer {
    color: var(--color-industrial-silver);
    font-style: italic;
    margin-top: var(--spacing-lg);
}

/* ===================================
   Footer
   =================================== */
.footer {
    background-color: var(--color-graphite);
    color: var(--color-ice-white);
    padding: var(--spacing-xl) 0 var(--spacing-md) 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    height: 36px;
    width: auto;
    margin-bottom: var(--spacing-sm);
    filter: brightness(0) invert(1);
}

.footer-tagline {
    color: var(--color-industrial-silver);
    font-size: 0.875rem;
    max-width: 400px;
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-link {
    color: var(--color-ice-white);
    font-weight: 600;
    transition: var(--transition);
}

.footer-link:hover {
    color: var(--color-arctic-blue);
}

.footer-legal {
    text-align: center;
    color: var(--color-industrial-silver);
    font-size: 0.875rem;
}

/* ===================================
   Responsive Design
   =================================== */

/* Tablet */
@media (max-width: 1024px) {
    :root {
        --spacing-xxl: 4rem;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .hero-title {
        font-size: 1.67rem;
    }

    .hero-grid,
    .how-it-works-grid,
    .partner-content {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing-lg) * 0.67);
    }

    .hero-image {
        order: -1;
        width: 66.67%;
        margin: 0 auto;
    }

    .problem-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .contact-options {
        grid-template-columns: 1fr;
    }

    .contact-divider {
        display: none;
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 2rem;
        --spacing-xl: 3rem;
        --spacing-xxl: 3rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .hero-title {
        font-size: 1.33rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-image {
        width: 66.67%;
        margin: 0 auto;
    }

    .nav {
        display: none;
    }

    .header-right {
        gap: var(--spacing-sm);
    }

    .language-switcher select {
        padding: 0.4rem 0.75rem;
        font-size: 0.875rem;
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

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

    .section {
        padding: var(--spacing-xl) 0;
    }

    .how-step {
        flex-direction: column;
        text-align: center;
    }

    .step-number {
        margin: 0 auto;
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .hero-title {
        font-size: 1.17rem;
    }

    .hero-image {
        width: 66.67%;
        margin: 0 auto;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .value-prop-text {
        font-size: 1.125rem;
    }
}