/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-accent: #1e40af;
    --bg-primary: #ffffff;
    --bg-alt: #f9fafb;
    --border: #e5e7eb;
    --tag-bg: #f3f4f6;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", "Cascadia Code", Consolas, monospace;
    --max-width: 860px;
    --spacing-section: 5rem;
}

/* Dark Mode — folgt der System-/Browser-Einstellung, kein JS */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #e6e8eb;
        --text-secondary: #9aa3af;
        --text-accent: #7aa2ff;
        --bg-primary: #0e1116;
        --bg-alt: #151a21;
        --border: #232a33;
        --tag-bg: #1a2029;
    }
    nav {
        background: rgba(14, 17, 22, 0.92);
    }
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background: var(--bg-primary);
    line-height: 1.7;
    font-size: 1rem;
}

/* Nav */
nav {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 56px;
    z-index: 100;
}

.nav-name {
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 0.02em;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
}

nav a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.875rem;
    transition: color 0.15s;
}

nav a:hover {
    color: var(--text-primary);
}

/* Main */
main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Hero */
.hero {
    padding: 6rem 0 5rem;
    max-width: 700px;
}

.hero-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-accent);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.hero-sub {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.hero-pitch {
    font-size: 1rem;
    line-height: 1.8;
    max-width: 600px;
    margin-bottom: 2.5rem;
}

.cta {
    display: inline-block;
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 0.75rem 1.75rem;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    transition: opacity 0.15s;
}

.cta:hover {
    opacity: 0.75;
}

/* Sections */
.section {
    padding: var(--spacing-section) 0;
    border-top: 1px solid var(--border);
}

.section-alt {
    background: var(--bg-alt);
    margin: 0 -2rem;
    padding: var(--spacing-section) 2rem;
    border-top: 1px solid var(--border);
}

.section-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-secondary);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin-bottom: 3rem;
}

/* Projects */
.project {
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 2rem;
    padding: 2.5rem 0;
    border-bottom: 1px solid var(--border);
}

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

.project-meta {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-secondary);
    padding-top: 0.4rem;
}

.project-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
    letter-spacing: -0.01em;
}

.project-context {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    margin-bottom: 1.25rem;
    letter-spacing: 0.01em;
}

.project-situation {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.project-content p {
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.project-result {
    color: var(--text-accent);
    font-weight: 500;
    margin-bottom: 1.25rem !important;
}

/* Tags */
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.5rem;
}

.tags span {
    background: var(--tag-bg);
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    padding: 0.25rem 0.6rem;
    border-radius: 2px;
}

/* Methodik */
.methodik-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 2.5rem 3rem;
}

.methodik-item h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.methodik-item p {
    font-size: 0.925rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

/* Homelab */
.homelab-header {
    margin-bottom: 2.5rem;
}

.homelab-lead {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.homelab-header p:not(.homelab-lead) {
    color: var(--text-secondary);
    max-width: 600px;
    font-size: 0.95rem;
}

.homelab-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 2.5rem;
}

.homelab-item {
    border-left: 2px solid var(--border);
    padding-left: 1.25rem;
}

.homelab-item h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.homelab-item p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.homelab-close {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    font-style: italic;
    color: var(--text-secondary);
}

/* Zertifizierungen */
.certs {
    margin-bottom: 1.5rem;
}

.cert-item {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
    align-items: baseline;
}

.cert-item:first-child {
    border-top: 1px solid var(--border);
}

.cert-name {
    font-weight: 600;
    font-size: 0.925rem;
}

.cert-desc {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.cert-footer {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-style: italic;
    font-family: var(--font-mono);
}

/* Kontakt */
.kontakt {
    max-width: 500px;
}

.kontakt p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1.75rem;
    line-height: 1.7;
}

.kontakt-email {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    border-bottom: 2px solid var(--text-primary);
    padding-bottom: 2px;
    transition: opacity 0.15s;
}

.kontakt-email:hover {
    opacity: 0.65;
}

/* Inline code */
code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: var(--tag-bg);
    padding: 0.1em 0.4em;
    border-radius: 2px;
}

/* Footer */
footer {
    border-top: 1px solid var(--border);
    padding: 2rem;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-secondary);
    letter-spacing: 0.04em;
}

/* Responsive */
@media (max-width: 640px) {
    nav ul {
        gap: 1.25rem;
    }

    .hero {
        padding: 4rem 0 3rem;
    }

    .project {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .project-meta {
        display: none;
    }

    .cert-item {
        grid-template-columns: 1fr;
        gap: 0.2rem;
    }

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

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

    .section-alt {
        margin: 0 -2rem;
    }
}