/* ==========================================================================
   Dipl. Ing. Katrin Rudolphi - Bauen im Bestand
   Modern, elegant stylesheet - Black on White design
   ========================================================================== */

/* --------------------------------------------------------------------------
   Font Setup
   -------------------------------------------------------------------------- */
@font-face {
    font-family: 'Inter';
    src: url('../fonts/InterVariable.woff2') format('woff2-variations'),
         url('../fonts/Inter-Regular.woff2') format('woff2');
    font-weight: 100 900;
    font-style: normal;
    font-display: swap;
}

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
    /* Black & White color palette */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #fafafa;
    --color-bg-tertiary: #f5f5f5;
    --color-text: #1a1a1a;
    --color-text-muted: #4a4a4a;
    --color-text-subtle: #6a6a6a;
    --color-accent: #000000;
    --color-border: rgba(0, 0, 0, 0.08);
    --color-border-strong: rgba(0, 0, 0, 0.15);
    --color-link: #1a1a1a;
    --color-link-hover: #000000;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 1.0625rem;
    --font-size-sm: 0.9375rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 2.5rem;
    --line-height: 1.7;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;

    /* Layout */
    --container-max: 900px;
    --navbar-height: 60px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--navbar-height);
}

body {
    margin: 0;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    color: var(--color-text);
    background: var(--color-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    margin: 0 0 var(--spacing-md);
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-text);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }

p {
    margin: 0 0 var(--spacing-md);
}

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

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

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

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

address {
    font-style: normal;
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-2xl) 0;
    position: relative;
}

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

.section-alt::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--color-border);
}

.section-alt::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--color-border);
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: background var(--transition-base), box-shadow var(--transition-base);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.06);
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-weight: 600;
    font-size: var(--font-size-lg);
    color: var(--color-text);
}

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

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--spacing-lg);
}

.nav-link {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    padding: var(--spacing-xs) 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-accent);
    transition: width var(--transition-base);
}

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

.nav-link:hover::after {
    width: 100%;
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: transform var(--transition-base);
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
    content: '';
    position: relative;
}

.nav-toggle-icon::before {
    top: -7px;
}

.nav-toggle-icon::after {
    top: 5px;
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
    padding: calc(var(--navbar-height) + var(--spacing-2xl)) 0 var(--spacing-2xl);
    text-align: center;
    min-height: 40vh;
    display: flex;
    align-items: center;
    position: relative;
    background: var(--color-bg-primary);
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--color-border);
}

.hero h1 {
    margin-bottom: var(--spacing-sm);
    font-weight: 300;
    letter-spacing: 0.02em;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-muted);
    margin: 0;
    font-weight: 300;
}

/* --------------------------------------------------------------------------
   Profile Section
   -------------------------------------------------------------------------- */
.profile {
    display: flex;
    gap: var(--spacing-xl);
    align-items: flex-start;
}

.profile-image img {
    border-radius: 4px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.profile-content h3 {
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    font-weight: 400;
}

/* --------------------------------------------------------------------------
   Banner/Figure
   -------------------------------------------------------------------------- */
.banner {
    margin: var(--spacing-xl) 0 0;
}

.banner img {
    border-radius: 4px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

/* --------------------------------------------------------------------------
   Contact Section
   -------------------------------------------------------------------------- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

.contact-info {
    line-height: 1.8;
}

.contact-details {
    margin-top: var(--spacing-md);
}

.contact-item {
    display: block;
    margin-bottom: var(--spacing-xs);
}

.contact-label {
    color: var(--color-text-muted);
    margin-right: var(--spacing-xs);
}

/* Map */
.map-container {
    min-height: 300px;
}

.map-placeholder {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-lg);
}

.map-placeholder-content p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.map {
    height: 300px;
    border-radius: 4px;
    overflow: hidden;
}

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-text);
    color: var(--color-bg-primary);
    border: 1px solid var(--color-text);
    border-radius: 4px;
    font-family: inherit;
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.btn:hover {
    background: transparent;
    color: var(--color-text);
}

.btn:active {
    background: var(--color-text-muted);
    border-color: var(--color-text-muted);
    color: var(--color-bg-primary);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
    background: var(--color-text);
    color: rgba(255, 255, 255, 0.8);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    position: relative;
}

.footer a {
    color: rgba(255, 255, 255, 0.8);
}

.footer a:hover {
    color: #ffffff;
}

.footer strong {
    color: #ffffff;
    font-weight: 500;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    text-align: center;
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.5);
}

.footer-bottom p {
    margin: 0;
}

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 2rem;
        --font-size-2xl: 1.5rem;
        --spacing-2xl: 3rem;
    }

    /* Mobile Navigation */
    .nav-toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: 0;
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-link {
        display: block;
        padding: var(--spacing-sm) 0;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-link::after {
        display: none;
    }

    /* Profile */
    .profile {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .profile-image {
        margin-bottom: var(--spacing-md);
    }

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

    /* Footer */
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-3xl: 1.75rem;
        --font-size-2xl: 1.375rem;
        --font-size-xl: 1.25rem;
    }

    .hero {
        min-height: 30vh;
    }
}

/* --------------------------------------------------------------------------
   Leaflet Map Overrides (when loaded)
   -------------------------------------------------------------------------- */
.leaflet-container {
    font-family: var(--font-family);
}