/* =============================================
   BISCHOF.ONE – Style Sheet
   Metro Design · Sharp Edges · #ff6700 Accent
   ============================================= */

/* --- CSS Custom Properties (Theme) --- */
:root {
    /* Accent */
    --accent: #ff6700;
    --accent-hover: #e55d00;
    --accent-glow: rgba(255, 103, 0, 0.15);

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;

    /* Layout */
    --container-max: 1200px;
    --nav-height: 72px;

    /* Border radius: NONE */
    --radius: 0;
}

/* --- Dark Theme (Default) --- */
[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --surface: #1a1a1a;
    --surface-alt: #222222;
    --surface-hover: #2a2a2a;
    --border: #333333;
    --border-light: #2a2a2a;
    --text-primary: #f0f0f0;
    --text-secondary: #b0b0b0;
    --text-muted: #666666;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
}

/* --- Light Theme --- */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --surface: #ffffff;
    --surface-alt: #f0f0f0;
    --surface-hover: #e8e8e8;
    --border: #d0d0d0;
    --border-light: #e0e0e0;
    --text-primary: #111111;
    --text-secondary: #555555;
    --text-muted: #999999;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
}

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

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    transition: background-color var(--transition-base), color var(--transition-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

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

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 600;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }

/* =============================================
   NAVIGATION
   ============================================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.navbar.scrolled {
    background: var(--bg-secondary);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.logo-accent {
    color: var(--accent);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--space-lg);
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: relative;
    padding: var(--space-xs) 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width var(--transition-base);
}

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

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

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

/* Theme Toggle */
.theme-toggle {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-primary);
    width: 44px;
    height: 44px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.125rem;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--surface-hover);
    border-color: var(--accent);
}

/* Burger Menu */
.nav-burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
}

.nav-burger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

.nav-burger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-burger.active span:nth-child(2) {
    opacity: 0;
}

.nav-burger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* =============================================
   HERO SECTION
   ============================================= */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--bg-primary);
}

#particleCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    padding-top: calc(var(--nav-height) + var(--space-xl));
    padding-bottom: var(--space-xl);
}

.hero-greeting {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--accent);
    margin-bottom: var(--space-sm);
    letter-spacing: 0.05em;
}

.hero-name {
    margin-bottom: var(--space-md);
    font-weight: 700;
}

.accent {
    color: var(--accent);
}

.hero-tagline {
    font-family: var(--font-mono);
    font-size: clamp(0.875rem, 1.5vw, 1.125rem);
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    letter-spacing: 0.02em;
}

.hero-description {
    max-width: 600px;
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: var(--space-lg);
}

.hero-cta {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

/* Scroll Indicator */
.hero-scroll-indicator {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
}

.hero-scroll-indicator span {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--accent), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 1; transform: scaleY(1); }
    50% { opacity: 0.5; transform: scaleY(0.6); }
}

/* =============================================
   BUTTONS
   ============================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    border-radius: var(--radius);
    text-decoration: none;
}

.btn-primary {
    background: var(--accent);
    color: #ffffff;
    border-color: var(--accent);
}

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    color: #ffffff;
    transform: translateY(-1px);
    box-shadow: 0 4px 20px var(--accent-glow);
}

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

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
}

/* =============================================
   SECTIONS
   ============================================= */
.section {
    padding: var(--space-2xl) 0;
}

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

.section-header {
    margin-bottom: var(--space-xl);
}

.section-label {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--accent);
    display: block;
    margin-bottom: var(--space-xs);
    letter-spacing: 0.05em;
}

.section-line {
    width: 60px;
    height: 2px;
    background: var(--accent);
    margin-top: var(--space-sm);
}

.section-intro {
    max-width: 700px;
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: var(--space-xl);
}

/* =============================================
   ABOUT
   ============================================= */
.about-grid {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
    align-items: start;
}

.about-content h3 {
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.about-content p {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border);
}

.stat-number {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
    display: block;
}

.stat-label {
    font-size: 0.8125rem;
    color: var(--text-muted);
    display: block;
    margin-top: var(--space-xs);
}

/* Philosophy Cards */
.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-md);
}

.philosophy-card {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: var(--space-lg);
    transition: all var(--transition-base);
    border-radius: var(--radius);
}

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

.card-icon {
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
}

.philosophy-card h4 {
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.philosophy-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* =============================================
   PROJECTS
   ============================================= */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: var(--space-lg);
}

.project-card {
    background: var(--surface);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: all var(--transition-base);
    border-radius: var(--radius);
}

.project-card:hover {
    border-color: var(--accent);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.project-content {
    padding: var(--space-lg);
}

.project-tags {
    display: flex;
    gap: var(--space-xs);
    flex-wrap: wrap;
    margin-bottom: var(--space-sm);
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 0.25rem 0.625rem;
    background: var(--accent-glow);
    color: var(--accent);
    border: 1px solid var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    border-radius: var(--radius);
}

.project-content h3 {
    margin-bottom: var(--space-sm);
}

.project-content p {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    font-size: 0.9375rem;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--border-light);
}

.project-tech span {
    font-size: 0.8125rem;
    color: var(--text-muted);
    padding: 0.25rem 0.5rem;
    background: var(--surface-alt);
    border-radius: var(--radius);
}

/* =============================================
   TECH STACK
   ============================================= */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--space-sm);
}

.tech-item {
    display: flex;
    flex-direction: column;
    padding: var(--space-md);
    background: var(--surface);
    border: 1px solid var(--border);
    transition: all var(--transition-fast);
    border-radius: var(--radius);
}

.tech-item:hover {
    border-color: var(--accent);
    background: var(--surface-hover);
}

.tech-name {
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--text-primary);
}

.tech-category {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* =============================================
   CONTACT
   ============================================= */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: start;
}

.contact-text h3 {
    margin-bottom: var(--space-md);
}

.contact-text p {
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-primary);
    transition: all var(--transition-fast);
    border-radius: var(--radius);
}

.contact-item:hover {
    border-color: var(--accent);
    color: var(--text-primary);
    transform: translateX(4px);
}

.contact-icon {
    font-size: 1.25rem;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-glow);
    color: var(--accent);
    flex-shrink: 0;
    border-radius: var(--radius);
}

.contact-label {
    font-size: 0.8125rem;
    color: var(--text-muted);
    display: block;
}

.contact-value {
    font-weight: 500;
    display: block;
}

/* =============================================
   FOOTER
   ============================================= */
.footer {
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--border);
    background: var(--bg-primary);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.footer-logo {
    font-family: var(--font-mono);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.footer-left p {
    color: var(--text-muted);
    font-size: 0.8125rem;
    margin-top: var(--space-xs);
}

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

.footer-right a {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.footer-right a:hover {
    color: var(--accent);
}

/* =============================================
   IMPRINT / PRIVACY PAGES
   ============================================= */
.page-content {
    padding-top: calc(var(--nav-height) + var(--space-xl));
    padding-bottom: var(--space-2xl);
    min-height: 100vh;
}

.page-content h1 {
    margin-bottom: var(--space-lg);
}

.page-content h2 {
    margin-top: var(--space-xl);
    margin-bottom: var(--space-sm);
    font-size: 1.25rem;
}

.page-content p,
.page-content ul {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.page-content ul {
    padding-left: var(--space-md);
}

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

/* =============================================
   IMAGE PLACEHOLDER
   ============================================= */
.image-placeholder {
    border: 1px dashed var(--border);
    border-radius: var(--radius);
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr;
    }

    .about-image {
        max-width: 300px;
    }

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

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: var(--space-md);
        gap: 0;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links a {
        display: block;
        padding: var(--space-sm) 0;
        border-bottom: 1px solid var(--border-light);
    }

    .nav-burger {
        display: flex;
    }

    .about-stats {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

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

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .tech-grid {
        grid-template-columns: 1fr;
    }
}