/* =========================================================
   edwardschmitzsoftware.com base stylesheet
   Product-inspired industrial palette
   ========================================================= */

:root {
    --color-bg: #e5e0d6;
    --color-surface: #faf7f0;
    --color-surface-soft: #f0e9dd;
    --color-header: #232a31;
    --color-header-dark: #151a1f;
    --color-footer: #151a1f;
    --color-accent: #3f8d63;
    --color-accent-dark: #2f6b4b;
    --color-accent-soft: #dcebe2;
    --color-text: #1f2933;
    --color-muted: #5f6b73;
    --color-border: #d4dce1;
    --font-main: Arial, Helvetica, sans-serif;
    --space-xs: 0.35rem;
    --space-sm: 0.65rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2.25rem;
    --space-xxl: 3.25rem;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --shadow-card: 0 8px 22px rgba(15, 20, 25, 0.12);
    --shadow-soft: 0 3px 10px rgba(15, 20, 25, 0.10);
    --container-width: 1120px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-main);
    font-size: 17px;
    line-height: 1.65;
    color: var(--color-text);
    background: var(--color-bg);
}

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

a {
    color: var(--color-accent);
    text-decoration: none;
}

    a:hover,
    a:focus {
        color: var(--color-accent-dark);
        text-decoration: underline;
    }

h1,
h2,
h3,
h4 {
    margin: 0 0 var(--space-md);
    line-height: 1.2;
    color: var(--color-header-dark);
}

h1 {
    font-size: clamp(2.1rem, 4vw, 3.15rem);
}

h2 {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
}

h3 {
    font-size: 1.25rem;
}

p {
    margin: 0 0 var(--space-md);
    font-size: 1.2rem;
}

ul,
ol {
    margin-top: 0;
    padding-left: 1.35rem;
}

li + li {
    margin-top: var(--space-xs);
}

/* Layout */

.container {
    width: min(var(--container-width), calc(100% - 2rem));
    margin-inline: auto;
}

.section {
    padding: var(--space-xxl) 0;
}

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

.section-heading {
    max-width: 760px;
    margin-bottom: var(--space-xl);
}

    .section-heading p {
        color: var(--color-muted);
        font-size: 1.05rem;
    }

.two-column {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--space-xl);
    align-items: start;
}

.centered {
    text-align: center;
}

/* Header */

.site-header {
    background: var(--color-header);
    color: #ffffff;
    box-shadow: var(--shadow-soft);
}

    .site-header .container {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: var(--space-lg);
        min-height: 72px;
    }

.site-brand {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    color: #ffffff;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

    .site-brand:hover,
    .site-brand:focus {
        color: #ffffff;
        text-decoration: none;
    }

.site-nav {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

    .site-nav a {
        color: #d8e3dc;
        font-weight: 600;
        font-size: 0.95rem;
    }

        .site-nav a:hover,
        .site-nav a:focus,
        .site-nav a.active {
            color: #ffffff;
            text-decoration: none;
        }

/* Page title / hero */

.page-title {
    background: linear-gradient(180deg, var(--color-header) 0%, var(--color-header-dark) 100%);
    color: #ffffff;
    padding: 3rem 0;
    text-align: center;
}

.page-title-kicker {
    display: block;
    margin-bottom: var(--space-sm);
    color: #7fcf9f;
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.page-title h1,
.page-title-heading {
    color: #ffffff;
    margin-bottom: var(--space-md);
}

.page-title-subtitle {
    max-width: 760px;
    margin: 0 auto;
    color: #dce6df;
    font-size: 1.15rem;
}

/* Cards */

.card-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-lg);
    margin-bottom: 2rem;
}

    .card-grid.two-up {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .card-grid.four-up {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    box-shadow: var(--shadow-card);
    transition: transform 160ms ease, box-shadow 160ms ease;
}

    .card:hover {
        transform: translateY(-2px);
        box-shadow: 0 12px 28px rgba(15, 20, 25, 0.16);
    }

.card-title {
    margin-bottom: var(--space-sm);
    color: var(--color-header-dark);
    font-size: 1.15rem;
    font-weight: 700;
}

.card-text {
    color: var(--color-muted);
    line-height: 1.75;
}

.card-link {
    display: inline-block;
    margin-top: var(--space-sm);
    font-weight: 700;
}

.card-media {
    margin: calc(var(--space-lg) * -1) calc(var(--space-lg) * -1) var(--space-lg);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    overflow: hidden;
    background: var(--color-surface-soft);
}

/* Technical content blocks */

.spec-list {
    margin: 0;
    padding-left: 3rem;
    padding-bottom: 1rem;
}

    .spec-list strong {
        color: var(--color-header-dark);
    }

.callout {
    background: var(--color-surface-soft);
    border-left: 5px solid var(--color-accent);
    border-radius: var(--radius-sm);
    padding: var(--space-lg);
}

    .callout p:last-child,
    .card p:last-child {
        margin-bottom: 0;
    }

/* Buttons */

.button,
a.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0.65rem 1rem;
    border-radius: var(--radius-sm);
    background: #00ff00;
    color: black;
    font-weight: 700;
    line-height: 1.2;
    text-decoration: none;
    border: 2px solid #000000;
    cursor: pointer;
}

    .button:hover,
    .button:focus,
    a.button:hover,
    a.button:focus {
        background: #008000;
        color: white;
        text-decoration: none;
    }

    .button.secondary {
        background: #ffffff;
        color: var(--color-accent-dark);
        border: 1px solid var(--color-border);
    }

        .button.secondary:hover,
        .button.secondary:focus {
            background: var(--color-accent-soft);
            color: var(--color-accent-dark);
        }

/* Footer */

.site-footer {
    background: var(--color-footer);
    color: #d8e2dc;
    padding: 1.5rem 0;
    margin-top: var(--space-xxl);
}

    .site-footer .container {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: var(--space-lg);
        flex-wrap: wrap;
    }

    .site-footer a {
        color: #ffffff;
        font-weight: 600;
    }

.footer-links {
    display: flex;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

/* Utilities */

.muted {
    color: var(--color-muted);
}

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

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

.no-margin {
    margin: 0;
}

/* Responsive */

@media (max-width: 900px) {
    .site-header .container {
        flex-direction: column;
        align-items: flex-start;
        padding: var(--space-md) 0;
    }

    .site-nav {
        gap: var(--space-md);
    }

    .two-column,
    .card-grid,
    .card-grid.two-up,
    .card-grid.four-up {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 640px) {
    body {
        font-size: 15px;
    }

    .container {
        width: min(100% - 1.25rem, var(--container-width));
    }

    .page-title,
    .section {
        padding: var(--space-xl) 0;
    }

    .two-column,
    .card-grid,
    .card-grid.two-up,
    .card-grid.four-up {
        grid-template-columns: 1fr;
    }

    .site-nav,
    .footer-links {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }

    .site-footer .container {
        align-items: flex-start;
    }
}

/* =========================================================
   Feature Cards
   ========================================================= */

.feature-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 18px;
    padding: 1.5rem;
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
}

.feature-card-image {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border-radius: 12px;
    border: 2px solid #5a5a5a;
    margin-bottom: 1.5rem;
}

.feature-card-body {
    flex-grow: 1;
}

.feature-card-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    color: var(--color-header-dark);
    margin-bottom: 1rem;
}

.feature-card-text {
    text-align: center;
    font-size: 1.1rem;
    line-height: 1.5;
    color: var(--color-text);
    margin-bottom: 2rem;
}

.feature-card-button {
    display: block;
    background: var(--color-header);
    color: white;
    text-align: center;
    text-decoration: none;
    padding: 1rem;
    border-radius: 8px;
    font-size: 1.2rem;
    font-weight: 700;
    transition: background 0.2s ease;
}

    .feature-card-button:hover {
        background: var(--color-header-dark);
        color: white;
        text-decoration: none;
    }

.diagram-callout {
    padding: 1.5rem;
}

.diagram-image {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 14px;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.image-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.82);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 3rem;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
    z-index: 5000;
    overflow-y: auto;
}

    .image-overlay.visible {
        opacity: 1;
        visibility: visible;
    }

#overlayDiagramImage {
    width: 100%;
    max-width: 1200px;
    height: auto;
    border-radius: 18px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
}

    .diagram-image:hover {
        transform: scale(1.01);
    }

.spec-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

@media (max-width: 768px) {
    .spec-columns {
        grid-template-columns: 1fr;
        gap: 0;
    }
}

.contact-phone {
    margin-bottom: 0rem;
}

.contact-note {
    color: gray;
    margin-top: 0;
    font-size: 0.9rem;
    opacity: 0.72;
}