/* ============================================================
   GERTVANDUINEN.COM — STYLESHEET
   Swiss grid, monochrome, editorial
   ============================================================ */


/* --- CUSTOM PROPERTIES ------------------------------------ */

:root {
    /* Fonts */
    --font-primary:   'Hanken Grotesk', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-mono:      'Geist Mono', 'Courier New', monospace;

    /* Colors — Light mode */
    --color-bg:           #ffffff;
    --color-fg:           #000000;
    --color-fg-muted:     #777777;
    --color-border:       #000000;
    --color-border-light: #dedede;

    /* Layout */
    --page-max:      1400px;
    --page-padding:  clamp(1.5rem, 4vw, 3rem);
    --header-height: 3rem;

    /* Spacing */
    --space-xs:  0.5rem;
    --space-sm:  1rem;
    --space-md:  2rem;
    --space-lg:  4rem;
    --space-xl:  8rem;

    /* Work grid columns — adjust to taste */
    --work-cols: 5;
}

[data-theme="dark"] {
    --color-bg:           #0c0c0c;
    --color-fg:           #f0f0f0;
    --color-fg-muted:     #888888;
    --color-border:       #f0f0f0;
    --color-border-light: #2a2a2a;
}


/* --- RESET ------------------------------------------------ */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-fg);
    transition: background-color 0.2s ease, color 0.2s ease;
    line-height: 1.5;
}

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

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

button {
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    color: inherit;
}


/* --- LAYOUT ----------------------------------------------- */

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


/* --- HEADER ----------------------------------------------- */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.header-inner {
    max-width: var(--page-max);
    margin: 0 auto;
    padding: 0 var(--page-padding);
    height: 100%;
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.site-name {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.site-logo {
    height: 1.4rem;
    width: auto;
    display: block;
    fill: currentColor;
}

.site-nav {
    display: flex;
    gap: var(--space-md);
    margin-left: auto;
}

.site-nav a {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 400;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-fg-muted);
    transition: color 0.15s ease;
}

.site-nav a:hover {
    color: var(--color-fg);
}

.theme-toggle {
    font-size: 0.875rem;
    color: var(--color-fg-muted);
    line-height: 1;
    padding: 0 0.25rem;
    transition: color 0.15s ease;
    user-select: none;
}

.theme-toggle:hover {
    color: var(--color-fg);
}


/* --- SECTION STRUCTURE ------------------------------------ */

section {
    border-bottom: 1px solid var(--color-border);
    transition: border-color 0.2s ease;
}

.section-header {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border-light);
    margin-bottom: var(--space-md);
    transition: border-color 0.2s ease;
}

.section-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-fg-muted);
}


/* --- HERO ------------------------------------------------- */

.hero {
    padding-top: calc(var(--header-height) + var(--space-xl));
    padding-bottom: var(--space-xl);
    min-height: 65vh;
    display: flex;
    align-items: flex-start;
    border-bottom: 1px solid var(--color-border);
}

.hero-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: var(--space-lg);
    align-items: end;
    width: 100%;
}

.hero-headline {
    font-family: var(--font-primary);
    font-size: clamp(2.25rem, 4.5vw, 4rem);
    font-weight: 500;
    line-height: 1.05;
    letter-spacing: -0.025em;
    margin-bottom: var(--space-md);
}

.hero-body {
    font-size: clamp(0.95rem, 1.5vw, 1.125rem);
    font-weight: 400;
    line-height: 1.65;
    color: var(--color-fg-muted);
    max-width: 48ch;
}

.hero-secondary {
    display: flex;
    align-items: flex-end;
    padding-bottom: 0.2em;
}

.secondary-line {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    line-height: 1.7;
    color: var(--color-fg-muted);
    max-width: 44ch;
}


/* --- WORK ------------------------------------------------- */

.work {
    padding: var(--space-lg) 0;
}

.work-grid {
    display: grid;
    grid-template-columns: repeat(var(--work-cols), 1fr);
    border-top: 1px solid var(--color-border-light);
    border-left: 1px solid var(--color-border-light);
    transition: border-color 0.2s ease;
}

.work-item {
    border-right: 1px solid var(--color-border-light);
    border-bottom: 1px solid var(--color-border-light);
    transition: border-color 0.2s ease;
    overflow: hidden;
}

.work-item-inner {
    aspect-ratio: 1 / 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    background-color: var(--color-bg);
    transition: background-color 0.15s ease;
}

.work-item-inner img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.work-item:hover .work-item-inner {
    background-color: var(--color-border-light);
}

.work-item-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.62rem;
    font-weight: 400;
    letter-spacing: 0.04em;
    color: var(--color-fg-muted);
    padding: 0.5rem 0.75rem;
    border-top: 1px solid var(--color-border-light);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: border-color 0.2s ease;
}

.work-item-label em {
    font-style: normal;
    opacity: 0.5;
    margin-left: 0.5em;
}

/* Placeholder state — remove once real work is added */
.work-item.placeholder .work-item-inner {
    background-color: var(--color-border-light);
    opacity: 0.25;
}


/* --- PROCESS ---------------------------------------------- */

.process {
    padding: var(--space-lg) 0;
}

.process-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

.process-text p {
    font-size: 1rem;
    line-height: 1.75;
    max-width: 58ch;
    color: var(--color-fg);
}

.process-text p + p {
    margin-top: var(--space-sm);
}


/* --- CONTACT ---------------------------------------------- */

.contact {
    padding: var(--space-lg) 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-lg);
    align-items: start;
}

.contact-intro p {
    font-size: 1rem;
    line-height: 1.7;
    max-width: 38ch;
}

.contact-intro a {
    border-bottom: 1px solid var(--color-fg-muted);
    transition: border-color 0.15s ease;
}

.contact-intro a:hover {
    border-bottom-color: var(--color-fg);
}

/* Form — tabular grid layout, Swiss-style */
.contact-form {
    display: flex;
    flex-direction: column;
    border-top: 1px solid var(--color-border-light);
    transition: border-color 0.2s ease;
}

.form-row {
    display: grid;
    grid-template-columns: 9rem 1fr;
    border-bottom: 1px solid var(--color-border-light);
    transition: border-color 0.2s ease;
}

.form-row label {
    font-family: var(--font-mono);
    font-size: 0.67rem;
    font-weight: 400;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-fg-muted);
    padding: 0.9rem var(--space-sm) 0.9rem 0;
    display: flex;
    align-items: flex-start;
    padding-top: 0.95rem;
    white-space: nowrap;
}

.form-row input,
.form-row textarea {
    font-family: var(--font-primary);
    font-size: 0.9rem;
    color: var(--color-fg);
    background: transparent;
    border: none;
    outline: none;
    padding: 0.9rem 0;
    width: 100%;
    resize: none;
    line-height: 1.5;
}

.form-row input::placeholder,
.form-row textarea::placeholder {
    color: var(--color-fg-muted);
    opacity: 0.5;
}

.form-row textarea {
    padding-top: 0.95rem;
}

.form-actions {
    padding-top: var(--space-md);
}

.btn-submit {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-fg);
    background: transparent;
    border: 1px solid var(--color-border);
    padding: 0.75rem 2.5rem;
    cursor: pointer;
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.2s ease;
}

.btn-submit:hover {
    background-color: var(--color-fg);
    color: var(--color-bg);
}

.btn-submit:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.form-message {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.04em;
    margin-top: var(--space-sm);
    min-height: 1.5rem;
    color: var(--color-fg-muted);
}


/* --- FOOTER ----------------------------------------------- */

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

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

.footer-copy,
.footer-tagline {
    font-family: var(--font-mono);
    font-size: 0.67rem;
    color: var(--color-fg-muted);
}


/* --- RESPONSIVE ------------------------------------------- */

@media (max-width: 1200px) {
    :root { --work-cols: 4; }
}

@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .hero-secondary {
        align-items: flex-start;
    }

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

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

@media (max-width: 768px) {
    :root { --work-cols: 3; }

    .site-nav { display: none; }

    :root {
        --space-xl: 5rem;
        --space-lg: 3rem;
    }
}

@media (max-width: 520px) {
    :root { --work-cols: 2; }

    .form-row {
        grid-template-columns: 1fr;
    }

    .form-row label {
        padding-bottom: 0;
        padding-top: 0.75rem;
        border-bottom: none;
    }

    .form-row input,
    .form-row textarea {
        padding-top: 0.25rem;
    }
}