/* =====================================================
   DIESTELKAMP CONSULTING GMBH - LANDINGPAGE
   Bold Style | Schwarzer Hintergrund mit Orange & Lila
   Mobile-First CSS
   ===================================================== */

/* =====================================================
   1. CSS CUSTOM PROPERTIES (Design Tokens)
   ===================================================== */
:root {
    /* Farben - abgeleitet vom Brief: Schwarz, Orange, Lila */
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1f1f1f;

    --primary-orange: #ff6b35;
    --primary-orange-hover: #e55a2b;
    --secondary-purple: #9c27b0;
    --secondary-purple-light: #ba68c8;

    --text-primary: #ffffff;
    --text-secondary: #e0e0e0;
    --text-muted: #b8b8b8;

    /* Gradient für Akzente */
    --gradient-accent: linear-gradient(135deg, var(--primary-orange) 0%, var(--secondary-purple) 100%);
    --gradient-card: linear-gradient(180deg, rgba(20, 20, 20, 1) 0%, rgba(18, 18, 18, 1) 100%);

    /* Typografie */
    --font-headline: 'Oswald', sans-serif;
    --font-body: 'Nunito', sans-serif;

    --text-base: 16px;
    --line-height-base: 1.6;
    --line-height-tight: 1.3;

    /* Spacing System */
    --spacing-xs: 0.25rem;   /* 4px */
    --spacing-sm: 0.5rem;    /* 8px */
    --spacing-md: 1rem;      /* 16px */
    --spacing-lg: 1.5rem;    /* 24px */
    --spacing-xl: 2rem;      /* 32px */
    --spacing-2xl: 3rem;     /* 48px */
    --spacing-3xl: 4rem;     /* 64px */

    /* Container */
    --container-max-width: 1400px;
    --container-padding: var(--spacing-lg);

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Shadows */
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.5);
    --shadow-card-hover: 0 8px 40px rgba(0, 0, 0, 0.6);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* Header Height */
    --header-height: 70px;
}

/* =====================================================
   2. RESET & BASE STYLES
   ===================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: var(--text-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-accent);
    border-radius: 5px;
}

/* =====================================================
   3. TYPOGRAPHY
   ===================================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-headline);
    line-height: var(--line-height-tight);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    font-weight: 600;
}

h3 {
    font-size: 1.5rem;
    font-weight: 600;
}

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

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

a:hover {
    color: var(--secondary-purple-light);
}

/* =====================================================
   4. SKIP-LINK (Barrierefreiheit)
   ===================================================== */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-accent);
    color: #fff;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-weight: 700;
    z-index: 10000;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--spacing-md);
    outline: 3px solid #fff;
    outline-offset: 2px;
}

/* =====================================================
   5. UTILITIES & CONTAINER
   ===================================================== */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* =====================================================
   6. HEADER & NAVIGATION
   ===================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--text-primary);
}

.logo-text {
    width: 40px;
    height: 40px;
    background: var(--gradient-accent);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-headline);
    font-size: 1.25rem;
    font-weight: 700;
    color: #fff;
}

.logo-name {
    font-family: var(--font-headline);
    font-size: 1.125rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

/* Hamburger Button */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 48px;
    height: 48px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.hamburger-icon {
    position: relative;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: background var(--transition-fast);
}

.hamburger-icon::before,
.hamburger-icon::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    transition: transform var(--transition-fast);
}

.hamburger-icon::before {
    top: -8px;
}

.hamburger-icon::after {
    bottom: -8px;
}

/* Hamburger Animation when Open */
.nav-toggle[aria-expanded="true"] .hamburger-icon {
    background: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger-icon::before {
    transform: translateY(8px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .hamburger-icon::after {
    transform: translateY(-8px) rotate(-45deg);
}

/* Navigation */
.nav {
    display: flex;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--spacing-xs);
}

.nav-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-headline);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    background: rgba(255, 107, 53, 0.1);
}

.nav-link:focus-visible {
    outline: 2px solid var(--primary-orange);
    outline-offset: 2px;
}

/* =====================================================
   7. HERO SECTION (Fullscreen)
   ===================================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: calc(var(--header-height) + var(--spacing-2xl));
    padding-bottom: var(--spacing-3xl);
    background:
        radial-gradient(ellipse at top right, rgba(156, 39, 176, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at bottom left, rgba(255, 107, 53, 0.1) 0%, transparent 50%),
        var(--bg-primary);
}

.hero-container {
    width: 100%;
}

/* Hero Intro */
.hero-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-3xl);
}

.hero h1 {
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, #fff 0%, rgba(255, 255, 255, 0.8) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.lead {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
}

/* =====================================================
   8. CARDS GRID (4 Service Cards)
   ===================================================== */
.cards-grid {
    display: grid;
    gap: var(--spacing-xl);
    width: 100%;
}

.card {
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.card:hover {
    transform: translateY(-8px);
    border-color: rgba(255, 107, 53, 0.3);
    box-shadow: var(--shadow-card-hover);
}

/* Card Header */
.card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.card-icon {
    flex-shrink: 0;
    color: var(--primary-orange);
    transition: color var(--transition-fast), transform var(--transition-normal);
}

.card:hover .card-icon {
    color: var(--secondary-purple-light);
    transform: scale(1.1);
}

.card-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
    color: var(--text-primary);
}

/* Card Body */
.card-body {
    flex-grow: 1;
}

.services-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.services-list li {
    font-size: 0.9375rem;
    color: var(--text-muted);
    line-height: 1.6;
    padding-left: var(--spacing-lg);
    position: relative;
}

.services-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 6px;
    height: 6px;
    background: var(--primary-orange);
    border-radius: 50%;
}

.services-list li strong {
    color: var(--text-secondary);
}

/* Card Footer */
.card-footer {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* =====================================================
   9. BUTTONS
   ===================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    font-family: var(--font-headline);
    font-size: 0.9375rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    min-height: 48px;
    min-width: 44px;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 107, 53, 0.4);
    color: #fff;
}

.btn-primary:focus-visible {
    outline: 3px solid var(--secondary-purple-light);
    outline-offset: 3px;
}

/* =====================================================
   10. FOOTER
   ===================================================== */
.footer {
    background: var(--bg-secondary);
    padding: var(--spacing-2xl) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-container {
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-copyright {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
}

.footer-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

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

.footer-links a:hover {
    color: var(--primary-orange);
}

.separator {
    color: rgba(255, 255, 255, 0.1);
}

/* =====================================================
   11. RESPONSIVE BREAKPOINTS
   ===================================================== */

/* Navigation: Mobile/Tablet (bis 1023px) als Hamburger-Menü */
@media screen and (max-width: 1023px) {
    .nav-toggle {
        display: flex;
    }

    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: rgba(10, 10, 10, 0.98);
        flex-direction: column;
        padding: var(--spacing-xl);
        transform: translateY(-150%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

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

    .nav-list {
        flex-direction: column;
        width: 100%;
    }

    .nav-link {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: 1.125rem;
        text-align: center;
        border-radius: var(--radius-sm);
    }
}

/* Tablet (min-width: 768px) */
@media screen and (min-width: 768px) {
    /* Cards Grid - 2 Spalten */
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Footer horizontal */
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
    }
}

/* Desktop (min-width: 1024px) */
@media screen and (min-width: 1024px) {
    /* Navigation - Desktop View */
    .nav-toggle {
        display: none;
    }

    .nav {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        background: transparent;
        flex-direction: row;
        padding: 0;
        border: none;
    }

    .nav-list {
        gap: var(--spacing-xs);
    }

    /* Cards Grid - 4 Spalten */
    .cards-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    /* Hero Intro größer auf Desktop */
    .hero-intro {
        margin-bottom: var(--spacing-3xl);
    }
}

/* Large Desktop (min-width: 1200px) */
@media screen and (min-width: 1200px) {
    :root {
        --container-max-width: 1400px;
    }

    .hero h1 {
        font-size: clamp(2.5rem, 6vw, 4rem);
    }
}

/* =====================================================
   12. ACCESSIBILITY & MOTION PREFERENCES
   ===================================================== */

/* Focus Visible Styles */
a:focus-visible,
button:focus-visible {
    outline: 3px solid var(--primary-orange);
    outline-offset: 3px;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }

    .card:hover {
        transform: none;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --bg-primary: #000000;
        --bg-secondary: #1a1a1a;
        --primary-orange: #ff8c42;
        --secondary-purple: #bb6bd9;
    }

    .card {
        border-width: 2px;
    }
}

/* =====================================================
   13. SCROLL MARGIN FOR ANCHOR TARGETS
   ===================================================== */
section[id],
article[id] {
    scroll-margin-top: calc(var(--header-height) + var(--spacing-xl));
}