/* ===================================
   Vantaguard – Style Sheet
   Farben: Dunkelblau, Anthrazit, Cyan-Akzente
   =================================== */

/* CSS Custom Properties */
:root {
    --color-primary: #0a1628;
    --color-secondary: #1a2a4a;
    --color-accent: #00d4aa;
    --color-accent-hover: #00b894;
    --color-accent-light: rgba(0, 212, 170, 0.1);
    --color-text: #e0e6ed;
    --color-text-muted: #8892a4;
    --color-surface: #0f1f3a;
    --color-surface-light: #162444;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-white: #ffffff;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.75rem;
    --font-size-5xl: 3.5rem;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 30px rgba(0, 212, 170, 0.15);

    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --header-height: 80px;
}

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

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

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

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

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

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===================================
   Header & Navigation
   =================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: 1000;
    background: rgba(10, 22, 40, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition);
}

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

.nav__logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-white);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.logo-icon {
    color: var(--color-accent);
    font-size: var(--font-size-2xl);
}

.nav__menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    list-style: none;
}

.nav__link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    transition: color var(--transition);
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition);
}

.nav__link:hover {
    color: var(--color-white);
}

.nav__link:hover::after {
    width: 100%;
}

.nav__toggle {
    display: none;
    width: 32px;
    height: 32px;
    align-items: center;
    justify-content: center;
}

.hamburger {
    width: 24px;
    height: 2px;
    background: var(--color-white);
    position: relative;
    transition: background var(--transition);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--color-white);
    transition: transform var(--transition);
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 1.75rem;
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition);
    white-space: nowrap;
}

.btn--primary {
    background: var(--color-accent);
    color: var(--color-primary);
    box-shadow: var(--shadow-glow);
}

.btn--primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 0 40px rgba(0, 212, 170, 0.25);
}

.btn--secondary {
    background: var(--color-surface-light);
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    padding: 0.75rem 1.25rem;
    font-size: var(--font-size-xs);
}

.btn--secondary:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.btn__icon {
    width: 16px;
    height: 16px;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(ellipse, rgba(0, 212, 170, 0.05) 0%, transparent 60%);
    pointer-events: none;
}

.hero__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero__subtitle {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: var(--spacing-sm);
}

.hero__title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    color: var(--color-white);
    line-height: 1.1;
    margin-bottom: var(--spacing-sm);
}

.hero__tagline {
    font-size: var(--font-size-2xl);
    font-weight: 300;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
}

.hero__description {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
    max-width: 520px;
}

.hero__visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero__graphic {
    width: 320px;
    height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.hero__graphic::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    animation: pulse 4s ease-in-out infinite;
}

.hero__graphic::after {
    content: '';
    position: absolute;
    width: 80%;
    height: 80%;
    border-radius: 50%;
    border: 1px solid rgba(0, 212, 170, 0.15);
    animation: pulse 4s ease-in-out infinite 1s;
}

.shield-icon {
    width: 120px;
    height: 120px;
    color: var(--color-accent);
    animation: float 6s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.05); opacity: 1; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* ===================================
   Section Header
   =================================== */
.section__header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section__title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.section__subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
}

/* ===================================
   About Section
   =================================== */
.about {
    padding: var(--spacing-3xl) 0;
}

.about__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.about__card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition);
}

.about__card:hover {
    border-color: rgba(0, 212, 170, 0.3);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.about__icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--spacing-md);
    color: var(--color-accent);
}

.about__icon svg {
    width: 100%;
    height: 100%;
}

.about__card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.about__card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* ===================================
   Projects Section
   =================================== */
.projects {
    padding: var(--spacing-3xl) 0;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.projects__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.project__card {
    background: var(--color-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    position: relative;
    transition: all var(--transition);
    overflow: hidden;
}

.project__card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), transparent);
    opacity: 0;
    transition: opacity var(--transition);
}

.project__card:hover {
    border-color: rgba(0, 212, 170, 0.2);
    box-shadow: var(--shadow-lg);
}

.project__card:hover::before {
    opacity: 1;
}

.project__icon {
    width: 56px;
    height: 56px;
    background: var(--color-accent-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    color: var(--color-accent);
}

.project__icon svg {
    width: 28px;
    height: 28px;
}

.project__badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(0, 212, 170, 0.1);
    color: var(--color-accent);
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-md);
    border: 1px solid rgba(0, 212, 170, 0.2);
}

.project__title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.project__description {
    font-size: var(--font-size-base);
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

/* ===================================
   Footer
   =================================== */
.footer {
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.footer__content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--spacing-lg);
}

.footer__logo {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-white);
}

.footer__text {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
}

.footer__links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer__links a {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    transition: color var(--transition);
}

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

.footer__bottom {
    text-align: center;
}

.footer__bottom p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* ===================================
   Legal Pages (Impressum & Datenschutz)
   =================================== */
.legal {
    padding-top: calc(var(--header-height) + var(--spacing-3xl));
    padding-bottom: var(--spacing-3xl);
    min-height: 100vh;
}

.legal__content {
    max-width: 800px;
    margin: 0 auto;
}

.legal__content h1 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-accent);
}

.legal__content h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-white);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
}

.legal__content h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.legal__content p {
    font-size: var(--font-size-base);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.legal__content ul,
.legal__content ol {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

.legal__content li {
    margin-bottom: var(--spacing-xs);
    line-height: 1.7;
}

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

.legal__content a:hover {
    text-decoration: underline;
}

.placeholder {
    background: var(--color-accent-light);
    border: 1px dashed var(--color-accent);
    border-radius: var(--radius-sm);
    padding: 0.125rem 0.5rem;
    font-style: italic;
    color: var(--color-accent);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .hero__container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-xl);
    }

    .hero__description {
        max-width: 100%;
        margin-left: auto;
        margin-right: auto;
    }

    .hero__visual {
        order: -1;
    }

    .hero__graphic {
        width: 240px;
        height: 240px;
    }

    .shield-icon {
        width: 80px;
        height: 80px;
    }

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

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

@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.75rem;
    }

    .nav__toggle {
        display: flex;
    }

    .nav__menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: rgba(10, 22, 40, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: var(--spacing-xl);
        gap: var(--spacing-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition);
        border-bottom: 1px solid var(--color-border);
    }

    .nav__menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav__link {
        font-size: var(--font-size-base);
        padding: var(--spacing-xs) 0;
    }

    .hero {
        min-height: auto;
        padding-top: calc(var(--header-height) + var(--spacing-2xl));
        padding-bottom: var(--spacing-2xl);
    }

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

    .about__card {
        padding: var(--spacing-lg);
    }

    .project__card {
        padding: var(--spacing-lg);
    }

    .footer__content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-lg);
    }

    .footer__links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

/* ===================================
   Scroll Animations
   =================================== */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

.project__card.animate-on-scroll:nth-child(2) {
    transition-delay: 0.15s;
}

.about__card.animate-on-scroll:nth-child(2) {
    transition-delay: 0.1s;
}

.about__card.animate-on-scroll:nth-child(3) {
    transition-delay: 0.2s;
}

/* Hamburger Animation */
.nav__toggle.active .hamburger {
    background: transparent;
}

.nav__toggle.active .hamburger::before {
    transform: rotate(45deg);
    top: 0;
}

.nav__toggle.active .hamburger::after {
    transform: rotate(-45deg);
    top: 0;
}

@media (max-width: 480px) {
    :root {
        --font-size-5xl: 2rem;
        --font-size-3xl: 1.5rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    .btn {
        width: 100%;
        justify-content: center;
    }
}