:root {
    /* Kit B — Cold & Terracotta */
    --logo-blue:     #0A2E44;   /* Cold Blue — primary / nav / headings */
    --accent:        #C26A4A;   /* Terracotta — CTA / accent */
    --shirt-blue:    #629BB6;   /* Shirt Blue — secondary / tints */
    --cream:         #E8D9B8;   /* Deep Cream — nav fg / light text */
    --deep-cream:    #E8D9B8;   /* page background */
    --deep-cream-dark: #D8C9A4; /* slightly darker surface */
    --cream-white:   #F2EBD4;   /* slightly lighter surface */
    --text-dark:     #0A2E44;   /* body headings */
    --text-light:    #4A7A8A;   /* body secondary text */
    --brown:         #0A2E44;
    --brown-light:   #629BB6;

    /* CTA — terracotta replaces yellow */
    --yellow:        #C26A4A;

    /* Terracotta tokens */
    --terracotta:       #C26A4A;
    --terracotta-dark:  #9B4E33;
    --terracotta-light: #D4906F;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--deep-cream);
    color: var(--text-dark);
    line-height: 1.6;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

header, hapt-header {
    display: block;
    background: linear-gradient(135deg, #0A2E44 0%, #061D2B 100%);
    padding: 20px 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}


.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--cream);
    text-decoration: none;
}

.logo img {
    height: 48px;
    width: auto;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 24px;
}

nav a {
    color: var(--cream);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 0;
    position: relative;
    transition: opacity 0.2s;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--yellow);
    transition: width 0.2s;
}

nav a:hover::after,
nav a.active::after {
    width: 100%;
}

nav a.active {
    color: var(--yellow);
}

.hero {
    background: linear-gradient(180deg, var(--cream-white) 0%, var(--deep-cream-dark) 100%);
    padding: 60px 0;
    text-align: center;
}

.hero-image {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(92, 77, 60, 0.2);
    margin-bottom: 32px;
}

.hero h1 {
    font-size: 3rem;
    color: var(--logo-blue);
    margin-bottom: 16px;
    font-weight: 800;
    letter-spacing: -1px;
}

.hero .tagline {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-button {
    display: inline-block;
    background: var(--yellow);
    color: var(--logo-blue);
    padding: 16px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all 0.2s;
    box-shadow: 0 4px 12px rgba(0, 85, 137, 0.2);
}

.cta-button:hover {
    background: #e8c94a;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 85, 137, 0.3);
}

section {
    padding: 60px 0;
}

section h2 {
    font-size: 2rem;
    color: var(--logo-blue);
    margin-bottom: 16px;
    text-align: center;
}

section .section-intro {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 40px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.goal-section {
    background: var(--cream-white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 40px;
}

.feature-card {
    background: var(--cream-white);
    border-radius: 12px;
    padding: 28px;
    box-shadow: 0 4px 16px rgba(0, 85, 137, 0.08);
    transition: transform 0.2s, box-shadow 0.2s;
    border-left: 4px solid var(--shirt-blue);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(92, 77, 60, 0.12);
}

.feature-card h3 {
    color: var(--logo-blue);
    margin-bottom: 12px;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.feature-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.feature-icon {
    width: 40px;
    height: 40px;
    background: var(--shirt-blue);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.technical-section {
    background: var(--logo-blue);
    color: var(--cream);
}

.technical-section h2 {
    color: var(--cream);
}

.technical-section .section-intro {
    color: var(--shirt-blue);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 40px;
}

.tech-card {
    background: rgba(98, 155, 182, 0.15);
    border-radius: 12px;
    padding: 28px;
    border: 1px solid rgba(98, 155, 182, 0.3);
}

.tech-card h3 {
    color: var(--yellow);
    margin-bottom: 12px;
    font-size: 1.1rem;
}

.tech-card ul {
    list-style: none;
    margin-top: 12px;
}

.tech-card li {
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
    color: var(--deep-cream-dark);
    font-size: 0.9rem;
}

.tech-card li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--yellow);
}

.api-endpoints {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    padding: 20px;
    margin-top: 16px;
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.85rem;
    overflow-x: auto;
}

.api-endpoints code {
    color: var(--terracotta-light);
}

.detail-section {
    background: var(--cream-white);
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
    margin-top: 40px;
}

.detail-card {
    background: var(--deep-cream);
    border-radius: 12px;
    padding: 32px;
    transition: transform 0.2s;
}

.detail-card:hover {
    transform: translateY(-4px);
}

.detail-card h3 {
    color: var(--logo-blue);
    margin-bottom: 16px;
    font-size: 1.3rem;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--shirt-blue);
}

.detail-card h4 {
    color: var(--brown);
    margin: 20px 0 12px;
    font-size: 1rem;
}

.detail-card ul {
    margin-left: 20px;
    color: var(--text-light);
}

.detail-card li {
    margin-bottom: 6px;
    font-size: 0.9rem;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
    margin-top: 16px;
}

.category-tag {
    background: var(--cream-white);
    padding: 10px 16px;
    border-radius: 20px;
    text-align: center;
    font-weight: 500;
    color: var(--brown);
    font-size: 0.9rem;
}

footer, hapt-footer {
    display: block;
    background: var(--logo-blue);
    color: var(--cream);
    padding: 40px 0;
    text-align: center;
}

footer p, hapt-footer p {
    opacity: 0.8;
    font-size: 0.9rem;
}

.footer-links {
    margin-top: 16px;
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--yellow);
    text-decoration: none;
    font-weight: 500;
}

.footer-links a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 12px;
        align-items: center;
    }

    nav {
        width: 100%;
    }

    nav ul {
        gap: 10px 16px;
        flex-wrap: wrap;
        justify-content: center;
        width: 100%;
        padding: 0 8px;
    }

    nav a {
        font-size: 0.9rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .features-grid, .tech-grid, .detail-grid {
        grid-template-columns: 1fr;
    }

    .hero-image {
        margin-bottom: 24px;
    }
}