/* ========================================
   CSS Variables
   ======================================== */

:root {
    /* Colors - Monochrome with subtle accent */
    --color-background: #ffffff;
    --color-background-alt: #fafafa;
    --color-text: #1a1a1a;
    --color-text-muted: #666666;
    --color-border: #e5e5e5;
    --color-accent: #0066cc;
    --color-accent-hover: #DA291C;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
    --font-size-small: 0.875rem;
    --font-size-base: 1rem;
    --font-size-large: 1.125rem;
    --font-size-h3: 1.25rem;
    --font-size-h2: 1.5rem;
    --font-size-h1: 2rem;
    --line-height-tight: 1.3;
    --line-height-base: 1.6;
    --line-height-relaxed: 1.75;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;

    /* Layout */
    --container-max: 1200px;
    --header-height: 64px;
    --border-radius: 4px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.2s ease;
}

/* ========================================
   Reset & Base Styles
   ======================================== */

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

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-background);
}

/* ========================================
   Typography
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    line-height: var(--line-height-tight);
    font-weight: 600;
    color: var(--color-text);
}

h1 {
    font-size: var(--font-size-h1);
    margin-bottom: var(--space-md);
}

h2 {
    font-size: var(--font-size-h2);
    margin-bottom: var(--space-md);
}

h3 {
    font-size: var(--font-size-h3);
    margin-bottom: var(--space-sm);
}

p {
    margin-bottom: var(--space-md);
}

p:last-child {
    margin-bottom: 0;
}

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

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

ul, ol {
    margin-left: var(--space-md);
    margin-bottom: var(--space-md);
}

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

strong {
    font-weight: 600;
}

kbd {
    display: inline-block;
    padding: 0.125rem 0.375rem;
    font-family: var(--font-family);
    font-size: 0.875em;
    color: var(--color-text);
    background-color: var(--color-background-alt);
    border: 1px solid var(--color-border);
    border-radius: 3px;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05);
}

/* ========================================
   Layout
   ======================================== */

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

.section {
    padding: var(--space-3xl) 0;
}

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

.section-title {
    font-size: var(--font-size-h2);
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
}

/* ========================================
   Header & Navigation
   ======================================== */

.header {
    position: sticky;
    top: 0;
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    height: var(--header-height);
}

.nav {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-md);
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem; /* Add gap for consistent spacing */
}

.nav-brand {
    font-weight: 600;
    font-size: var(--font-size-large);
    margin-right: 1rem; /* Ensure spacing on the right */
    flex-shrink: 0; /* Prevent logo from shrinking */
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-text);
    text-decoration: none;
}

.brand-link:hover {
    color: var(--color-text);
    text-decoration: none;
}

.brand-logo {
    height: 40px;
    width: auto;
    display: block;
    border: none;
    outline: none;
}

.brand-text {
    font-size: 0.875rem;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: 0.05em;
}

/* CSS-only Mobile Menu (checkbox hack) */
.mobile-menu-checkbox {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

/* Mobile Menu Toggle Label (styled as button) */
.mobile-menu-toggle {
    display: none; /* Hidden on desktop */
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    margin-left: auto; /* Push to right on mobile */
    z-index: 101;
}

.hamburger-icon {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    position: relative;
}

.hamburger-icon::before,
.hamburger-icon::after {
    content: '';
    position: absolute;
    left: 0;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
}

.hamburger-icon::before {
    top: -7px;
}

.hamburger-icon::after {
    top: 7px;
}

/* Hamburger change to X when menu is open (checkbox hack) */
.mobile-menu-checkbox:checked ~ .mobile-menu-toggle .hamburger-icon {
    background-color: transparent;
}

.mobile-menu-checkbox:checked ~ .mobile-menu-toggle .hamburger-icon::before {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-checkbox:checked ~ .mobile-menu-toggle .hamburger-icon::after {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Language Wrapper */
.mobile-lang-wrapper {
    display: none; /* Hidden on desktop */
}

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

.nav-link {
    color: var(--color-text);
    text-decoration: none;
    font-size: var(--font-size-small);
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-accent);
    text-decoration: none;
}

.shortcut {
    color: var(--color-text-muted);
    font-size: 0.8125rem;
}

.lang-switcher {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    border-left: 1px solid var(--color-border);
    padding-left: var(--space-md);
    margin-left: var(--space-xs);
}

/* Hide desktop language switcher on mobile */
@media (max-width: 767px) {
    .lang-switcher:not(.mobile-lang) {
        display: none;
    }
}

.lang-flag {
    display: inline-flex;
    align-items: center;
    line-height: 1;
}

.lang-flag svg {
    vertical-align: middle;
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    padding-top: var(--space-2xl);
    padding-bottom: var(--space-3xl);
}

.hero-title {
    font-size: 2.5rem;
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-md);
}

.hero-subtitle {
    font-size: 1.35rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
}

.hero-intro {
    font-size: var(--font-size-large);
    line-height: var(--line-height-relaxed);
    max-width: 70ch;
    margin-bottom: var(--space-lg);
}

.hero-location {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--color-text-muted);
    font-size: var(--font-size-base);
    margin-bottom: var(--space-xl);
}

.hero-location .icon {
    flex-shrink: 0;
}

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

.hero-actions {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

/* ========================================
   Buttons
   ======================================== */

.button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    text-align: center;
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
    border: 1px solid var(--color-border);
    cursor: pointer;
}

.button-primary {
    background-color: #DA291C;
    color: var(--color-background);
    border-color: #DA291C;
}

.button-primary:hover {
    background-color: #DA291C;
    color: var(--color-background);
    border-color: #555555;
    text-decoration: none;
    transform: translateY(-1px);
}

.button-secondary {
    background-color: var(--color-background);
    color: var(--color-text);
    border-color: var(--color-border);
}

.button-secondary:hover {
    border-color: #555555;
    text-decoration: none;
    transform: translateY(-1px);
}

/* ========================================
   Grid & Cards
   ======================================== */

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

.card {
    padding: var(--space-lg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: var(--color-background);
    transition: border-color var(--transition-fast);
}

.card:hover {
    border-color: var(--color-text-muted);
}

.card-title {
    font-size: var(--font-size-h3);
    margin-bottom: var(--space-sm);
}

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

.card-icon {
    color: var(--color-text);
    margin-bottom: var(--space-md);
    display: block;
}

/* ========================================
   Projects Section
   ======================================== */

.project-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.project {
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
}

.project:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.project-title {
    font-size: var(--font-size-h3);
    margin-bottom: var(--space-md);
}

.project-description {
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-md);
}

.project-meta {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    font-size: var(--font-size-small);
    color: var(--color-text-muted);
}

.meta-item {
    display: block;
}

/* ========================================
   Process Section
   ======================================== */

.process-steps {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.step {
    position: relative;
    padding-left: var(--space-xl);
}

.step-number {
    position: absolute;
    left: 0;
    top: 0;
    font-size: var(--font-size-small);
    font-weight: 600;
    color: var(--color-text-muted);
    font-variant-numeric: tabular-nums;
}

.step-title {
    font-size: var(--font-size-h3);
    margin-bottom: var(--space-sm);
}

.step-description {
    line-height: var(--line-height-relaxed);
    color: var(--color-text-muted);
}

/* ========================================
   Contact Section
   ======================================== */

.contact-content {
    max-width: 70ch;
}

.contact-intro {
    font-size: var(--font-size-large);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-xl);
}

.contact-info {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
    padding: var(--space-lg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
}

.info-item strong {
    display: block;
    margin-bottom: var(--space-xs);
    font-size: var(--font-size-small);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
}

.info-item p {
    margin: 0;
}

.contact-icon {
    display: inline-block;
    vertical-align: middle;
    margin-right: 0.375rem;
    color: var(--color-text);
}

/* ========================================
   Footer
   ======================================== */

.footer {
    border-top: 1px solid var(--color-border);
    padding: var(--space-xl) 0;
    background-color: var(--color-background-alt);
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    align-items: center;
    text-align: center;
    font-size: var(--font-size-small);
    color: var(--color-text-muted);
}

.footer-copyright {
    margin: 0;
}

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

.footer-link {
    color: var(--color-text-muted);
    text-decoration: none;
}

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

.footer-hint {
    margin: 0;
}

/* ========================================
   Keyboard Shortcuts Overlay
   ======================================== */

.shortcuts-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--space-md);
}

.shortcuts-overlay[aria-hidden="false"] {
    display: flex;
}

.shortcuts-modal {
    background-color: var(--color-background);
    border-radius: var(--border-radius);
    max-width: 500px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.shortcuts-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.shortcuts-header h2 {
    font-size: var(--font-size-h3);
    margin: 0;
}

.shortcuts-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius);
    transition: background-color var(--transition-fast);
}

.shortcuts-close:hover {
    background-color: var(--color-background-alt);
    color: var(--color-text);
}

.shortcuts-body {
    padding: var(--space-lg);
}

.shortcuts-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}

.shortcut-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
}

.shortcut-item:last-child {
    border-bottom: none;
}

.shortcut-item dt {
    font-weight: 500;
}

.shortcut-item dd {
    color: var(--color-text-muted);
    margin: 0;
}

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

/* ========================================
   Mobile Navigation (< 768px)
   ======================================== */

@media (max-width: 767px) {
    /* Show mobile menu toggle */
    .mobile-menu-toggle {
        display: block;
        order: 2; /* After logo */
    }

    /* Show mobile language switcher */
    .mobile-lang-wrapper {
        display: flex;
        order: 3; /* After hamburger */
        margin-left: 0.25rem;
    }

    .mobile-lang {
        border-left: 1px solid var(--color-border);
        padding-left: 1.25rem;
        margin-left: 0;
        font-size: 0.875rem;
    }

    /* Reorder nav elements */
    .nav {
        flex-wrap: wrap;
    }

    .nav-brand {
        order: 1;
        margin-right: 0; /* Remove margin, use gap instead */
    }

    /* Hide desktop nav-links by default on mobile */
    .nav-links {
        display: none;
        position: absolute;
        top: var(--header-height); /* 64px */
        left: 0;
        right: 0;
        background-color: var(--color-background);
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        gap: 0;
        padding: 0;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        order: 4; /* Last in order */
        width: 100%;
    }

    /* Show nav-links when checkbox is checked (CSS-only mobile menu) */
    .mobile-menu-checkbox:checked ~ .nav-links {
        display: flex;
    }

    /* Mobile nav link styling */
    .nav-links .nav-link {
        padding: 1rem var(--space-md);
        border-bottom: 1px solid var(--color-border);
        width: 100%;
        justify-content: flex-start;
    }

    .nav-links .nav-link:last-child {
        border-bottom: none;
    }

    /* Hide desktop language switcher in mobile menu */
    .nav-links .lang-switcher:not(.mobile-lang) {
        display: none;
    }

    /* Keyboard shortcuts styling in mobile */
    .nav-links .shortcut {
        margin-right: 0.5rem;
    }

    /* Hero buttons on same line */
    .hero-actions {
        flex-wrap: nowrap;
        align-items: stretch;
    }

    .hero-actions .button {
        flex: 1;
        text-align: center;
        padding: 0.75rem 0.5rem;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    /* Scale up location icon on mobile */
    .hero-location .icon {
        width: 20px;
        height: 20px;
    }
}

@media (min-width: 640px) {
    .hero-title {
        font-size: 3rem;
    }

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

    .contact-info {
        grid-template-columns: repeat(3, 1fr);
    }

    .footer-content {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }

    .project-meta {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .meta-item::after {
        content: " •";
        margin-left: var(--space-sm);
        color: var(--color-border);
    }

    .meta-item:last-child::after {
        content: none;
    }
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--space-lg);
    }

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

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

    .shortcuts-list {
        grid-template-columns: 1fr 1fr;
    }
}

@media (min-width: 1024px) {
    :root {
        --font-size-h1: 2.25rem;
        --font-size-h2: 1.75rem;
    }

    .section {
        padding: var(--space-3xl) 0;
    }

    .hero {
        padding-top: var(--space-3xl);
        padding-bottom: var(--space-3xl);
    }
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
    .header,
    .shortcuts-overlay,
    .hero-actions,
    .contact-form,
    .footer-hint {
        display: none;
    }

    body {
        font-size: 12pt;
        line-height: 1.5;
    }

    .section {
        page-break-inside: avoid;
    }
}