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

:root {
    --text: #1a1a2e;
    --text-light: #555;
    --text-muted: #888;
    --bg: #ffffff;
    --bg-alt: #f8f9fb;
    --bg-dark: #1a1a2e;
    --accent: #2563eb;
    --accent-light: #dbeafe;
    --border: #e5e7eb;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Navigation ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.nav.scrolled {
    border-bottom-color: var(--border);
    box-shadow: var(--shadow);
}

.nav-container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
    letter-spacing: -0.02em;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--text);
    border-radius: 50%;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 8px;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-light);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    transition: var(--transition);
}

.nav-links a:hover { color: var(--text); background: var(--bg-alt); }

.nav-cta {
    background: var(--text) !important;
    color: #fff !important;
    padding: 8px 20px !important;
}

.nav-cta:hover { opacity: 0.85; }

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    flex-direction: column;
    gap: 5px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Hero ===== */
.hero {
    padding: 120px 0 60px;
    min-height: auto;
    display: flex;
    align-items: center;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.hero-image {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    aspect-ratio: 4/5;
    background: var(--bg-alt);
    background-size: cover;
    background-position: center;
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.hero-label {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--accent);
    margin-bottom: 16px;
}

.hero-title {
    font-size: clamp(3rem, 7vw, 5.5rem);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-light);
    max-width: 540px;
    margin-bottom: 40px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 64px;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 14px 28px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
}

.btn-primary {
    background: var(--text);
    color: #fff;
}

.btn-primary:hover { opacity: 0.85; transform: translateY(-1px); }

.btn-outline {
    border: 1.5px solid var(--border);
    color: var(--text);
    background: transparent;
}

.btn-outline:hover { border-color: var(--text); background: var(--bg-alt); }

.hero-stats {
    display: flex;
    gap: 48px;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 500;
}

/* ===== Sections ===== */
.section { padding: 60px 0; }
.section-alt { background: var(--bg-alt); }

.section-dark {
    background: var(--bg-dark);
    color: #fff;
}

.section-dark .section-label { color: #93c5fd; }
.section-dark .section-desc { color: #94a3b8; }

.section-header {
    margin-bottom: 36px;
    max-width: 600px;
}

.section-label {
    font-size: 0.82rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--accent);
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin-bottom: 16px;
}

.section-desc {
    color: var(--text-light);
    font-size: 1.05rem;
}

/* ===== Section Banners ===== */
.section-banner {
    height: 180px;
    background-size: cover;
    background-position: center;
    position: relative;
}

.section-banner-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, rgba(248,249,251,0.3) 0%, rgba(248,249,251,1) 90%);
}

.section:not(.section-alt) > .section-banner .section-banner-overlay {
    background: linear-gradient(to bottom, rgba(255,255,255,0.3) 0%, rgba(255,255,255,1) 90%);
}

/* ===== About ===== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: start;
}

.about-text p {
    color: var(--text-light);
    margin-bottom: 16px;
    font-size: 1.02rem;
}

.about-text blockquote {
    font-style: italic;
    color: var(--text);
    font-size: 1.1rem;
    padding-left: 20px;
    border-left: 3px solid var(--accent);
    margin-top: 24px;
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.highlight-card {
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.highlight-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.highlight-icon {
    color: var(--accent);
    margin-bottom: 12px;
}

.highlight-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.highlight-card p {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ===== Timeline ===== */
.timeline {
    position: relative;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: var(--border);
}

.timeline-item {
    position: relative;
    margin-bottom: 48px;
}

.timeline-item:last-child { margin-bottom: 0; }

.timeline-marker {
    position: absolute;
    left: -40px;
    top: 8px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bg-alt);
    border: 3px solid var(--accent);
    z-index: 1;
}

.timeline-date {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.timeline-content h3 {
    font-size: 1.35rem;
    font-weight: 700;
    margin: 6px 0 12px;
}

.timeline-content > p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.timeline-roles {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.role {
    padding: 16px 20px;
    background: var(--bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.role h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.role p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* ===== Projects Grid ===== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.project-card {
    padding: 28px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
    background: var(--bg);
}

.project-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

.project-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
}

.project-tag {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--accent);
    background: var(--accent-light);
    padding: 3px 10px;
    border-radius: 20px;
}

.project-period {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.project-card > p:not(.project-period) {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 14px;
}

.project-modules {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.project-modules span {
    font-size: 0.72rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 6px;
    background: var(--bg-alt);
    color: var(--text-light);
}

/* ===== Skills ===== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.skill-category h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent);
    display: inline-block;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tags span {
    font-size: 0.85rem;
    padding: 6px 14px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-light);
    font-weight: 500;
    transition: var(--transition);
}

.skill-tags span:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* ===== Education ===== */
.edu-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.edu-card {
    padding: 32px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.edu-card:hover { border-color: var(--accent); box-shadow: var(--shadow-md); }

.edu-icon {
    color: var(--accent);
    margin-bottom: 16px;
}

.edu-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.edu-card p {
    color: var(--text-light);
    font-size: 0.92rem;
    margin-bottom: 8px;
}

.edu-year {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* ===== Contact ===== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.contact-card {
    padding: 28px;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius);
    text-decoration: none;
    color: #fff;
    transition: var(--transition);
    display: block;
}

.contact-card:hover {
    border-color: rgba(255,255,255,0.25);
    background: rgba(255,255,255,0.05);
    transform: translateY(-2px);
}

.contact-card svg {
    margin-bottom: 14px;
    color: #93c5fd;
}

.contact-card h3 {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 6px;
    color: #94a3b8;
}

.contact-card p {
    font-size: 0.95rem;
    color: #e2e8f0;
}

/* ===== Footer ===== */
.footer {
    padding: 24px 0;
    border-top: 1px solid var(--border);
}

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

.footer p {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.footer-impressum-link {
    font-size: 0.82rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}

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

/* ===== Impressum Modal ===== */
.impressum-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 24px;
}

.impressum-content {
    background: #fff;
    border-radius: var(--radius);
    padding: 40px;
    max-width: 600px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
}

.impressum-content h2 {
    font-size: 1.5rem;
    margin-bottom: 16px;
}

.impressum-content h3 {
    font-size: 1rem;
    margin-top: 20px;
    margin-bottom: 8px;
}

.impressum-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 12px;
}

.impressum-content a {
    color: var(--primary);
    text-decoration: none;
}

.impressum-close {
    position: absolute;
    top: 16px;
    right: 20px;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    line-height: 1;
}

.impressum-close:hover {
    color: var(--text);
}

/* ===== Animations ===== */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .about-grid { grid-template-columns: 1fr; gap: 40px; }
    .projects-grid { grid-template-columns: repeat(2, 1fr); }
    .skills-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: repeat(2, 1fr); }
    .hero-stats { gap: 32px; }
}

@media (max-width: 640px) {
    .nav-toggle { display: flex; }

    .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 16px 24px;
        border-bottom: 1px solid var(--border);
        transform: translateY(-120%);
        transition: var(--transition);
        gap: 4px;
    }

    .nav-links.open { transform: translateY(0); }
    .nav-links a { padding: 12px 16px; width: 100%; }

    .hero { padding: 100px 0 40px; }
    .hero-grid { grid-template-columns: 1fr; gap: 40px; }
    .hero-image { max-height: 400px; aspect-ratio: 3/2; }
    .hero-title { font-size: 2.75rem; }
    .hero-actions { flex-direction: column; }
    .hero-stats { flex-direction: column; gap: 16px; }
    .projects-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .edu-grid { grid-template-columns: 1fr; }
    .section { padding: 40px 0; }
}