/* =========================================================
   DIGIBIT IT — Stylesheet
   Black & white only, modern, high-contrast business design.
   Mobile-first responsive layout.
   ========================================================= */

/* ---------- Self-hosted font (Inter, variable, latin subset) ---------- */
@font-face {
    font-family: "Inter";
    font-style: normal;
    font-weight: 100 900;
    font-display: swap;
    src: url("fonts/inter-var.woff2") format("woff2");
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6,
        U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193,
        U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ---------- Design tokens ---------- */
:root {
    --color-bg: #ffffff;
    --color-surface: #ffffff;
    --color-muted: #f4f4f4;
    --color-border: #e6e6e6;
    --color-border-strong: #111111;
    --color-text: #111111;
    --color-text-soft: #555555;
    --color-invert-bg: #0a0a0a;
    --color-invert-text: #ffffff;

    --max-width: 1180px;
    --radius: 4px;
    --radius-lg: 8px;

    --space-1: 0.5rem;
    --space-2: 1rem;
    --space-3: 1.5rem;
    --space-4: 2rem;
    --space-5: 3rem;
    --space-6: 4rem;
    --space-7: 6rem;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.1);

    --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        Helvetica, Arial, sans-serif;

    --transition: 180ms ease;
    --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

* {
    margin: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.65;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
    padding: 0;
}

h1,
h2,
h3 {
    line-height: 1.15;
    font-weight: 800;
    letter-spacing: -0.02em;
}

p {
    color: var(--color-text);
}

/* ---------- Accessibility helpers ---------- */
.skip-link {
    position: absolute;
    left: 0;
    top: 0;
    background: #000;
    color: #fff;
    padding: 0.75rem 1.25rem;
    font-weight: 600;
    transform: translateY(-120%);
    transition: transform var(--transition);
    z-index: 1000;
}

.skip-link:focus {
    transform: translateY(0);
}

:focus-visible {
    outline: 3px solid #000;
    outline-offset: 3px;
}

/* ---------- Layout ---------- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin-inline: auto;
    padding-inline: 1.25rem;
}

.section {
    padding-block: var(--space-6);
}

.section-muted {
    background: var(--color-muted);
    border-block: 1px solid var(--color-border);
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--color-text-soft);
    margin-bottom: var(--space-2);
}

.eyebrow-light {
    color: #bfbfbf;
}

.section-head {
    max-width: 640px;
    margin-bottom: var(--space-5);
}

.section-title {
    font-size: clamp(1.6rem, 4vw, 2.4rem);
}

.section-lead {
    margin-top: var(--space-2);
    color: var(--color-text-soft);
    font-size: 1.05rem;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.85rem 1.5rem;
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: 0.01em;
    border: 2px solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background var(--transition), color var(--transition),
        border-color var(--transition), transform var(--transition),
        box-shadow var(--transition);
    text-align: center;
}

.btn-primary {
    background: #000;
    color: #fff;
    border-color: #000;
}

.btn-primary:hover {
    background: #2a2a2a;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active {
    transform: translateY(1px);
}

.btn-secondary {
    background: transparent;
    color: #000;
    border-color: #000;
}

.btn-secondary:hover {
    background: #000;
    color: #fff;
    transform: translateY(-1px);
}

.btn-inverse {
    background: #fff;
    color: #000;
    border-color: #fff;
}

.btn-inverse:hover {
    background: #e6e6e6;
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.btn-inverse-outline {
    background: transparent;
    color: #fff;
    border-color: rgba(255, 255, 255, 0.6);
}

.btn-inverse-outline:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: #fff;
    transform: translateY(-1px);
}

/* ---------- Header ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: saturate(180%) blur(10px);
    border-bottom: 1px solid var(--color-border);
    transition: box-shadow var(--transition);
}

.site-header.is-scrolled {
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 68px;
    gap: var(--space-3);
    transition: min-height var(--transition);
}

.site-header.is-scrolled .header-inner {
    min-height: 56px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    font-weight: 800;
    font-size: 1.05rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    line-height: 1;
}

.logo-img {
    display: block;
    height: 64px;
    width: auto;
}

.logo-text strong {
    font-weight: 900;
}

.logo-text {
    font-weight: 800;
    color: inherit;
}

/* Desktop nav */
.primary-nav ul {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.primary-nav a {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-text);
    padding: 0.4rem 0;
    border-bottom: 2px solid transparent;
    transition: border-color var(--transition), color var(--transition);
}

.primary-nav a:hover {
    border-bottom-color: #000;
}

.primary-nav a.is-active {
    border-bottom-color: #000;
}

.primary-nav .nav-cta {
    background: #000;
    color: #fff;
    padding: 0.6rem 1.1rem;
    border-radius: var(--radius);
    border: 2px solid #000;
}

.primary-nav .nav-cta:hover {
    background: #2a2a2a;
    border-bottom-color: transparent;
}

/* Language switcher */
.lang-switch {
    display: inline-flex;
    align-items: center;
    gap: 0.15rem;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.lang-switch a {
    padding: 0.25rem 0.45rem;
    border-radius: var(--radius);
    border-bottom: none;
    color: var(--color-text-soft);
    transition: color var(--transition), background var(--transition);
}

.lang-switch a:hover {
    color: #000;
    background: var(--color-muted);
}

.lang-switch a[aria-current="true"] {
    color: #fff;
    background: #000;
}

.lang-switch .lang-sep {
    color: #999;
}

/* Nav toggle (mobile) */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    cursor: pointer;
    padding: 0 10px;
}

.nav-toggle-bar {
    display: block;
    height: 2px;
    width: 100%;
    background: #000;
    transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Hero ---------- */
.hero {
    padding-block: clamp(3rem, 9vw, 7rem);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: linear-gradient(var(--color-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
    background-size: 44px 44px;
    -webkit-mask-image: radial-gradient(
        ellipse 90% 75% at 75% 15%,
        #000 0%,
        transparent 70%
    );
    mask-image: radial-gradient(
        ellipse 90% 75% at 75% 15%,
        #000 0%,
        transparent 70%
    );
    opacity: 0.55;
    pointer-events: none;
}

.hero-inner {
    max-width: 880px;
    position: relative;
}

.hero-title {
    font-size: clamp(2.1rem, 6vw, 4rem);
    font-weight: 900;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-3);
}

.hero-sub {
    font-size: clamp(1.05rem, 2.2vw, 1.3rem);
    color: var(--color-text-soft);
    max-width: 640px;
    margin-bottom: var(--space-4);
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-5);
}

.hero-cta .btn {
    flex: 1 1 auto;
    min-width: 200px;
}

.trust-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.5rem;
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border);
}

.trust-list li {
    position: relative;
    padding-left: 1.25rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
}

.trust-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 8px;
    height: 8px;
    background: #000;
}

/* ---------- Cards (Leistungen) ---------- */
.card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1px;
    background: var(--color-border);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.card {
    background: var(--color-surface);
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    position: relative;
    transition: background var(--transition), transform var(--transition),
        box-shadow var(--transition);
}

.card:hover {
    background: #fafafa;
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    z-index: 1;
}

.card-num {
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    color: #000;
    margin-bottom: var(--space-2);
}

.card-title {
    font-size: 1.2rem;
    margin-bottom: var(--space-1);
}

.card-text {
    color: var(--color-text-soft);
    font-size: 0.97rem;
}

/* ---------- Audience ---------- */
.audience-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2);
}

.audience-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-left: 4px solid #000;
    padding: var(--space-3);
    border-radius: var(--radius);
    transition: transform var(--transition), box-shadow var(--transition);
}

.audience-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.audience-item h3 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.audience-item p {
    color: var(--color-text-soft);
    font-size: 0.97rem;
}

/* ---------- KI & Automatisierung ---------- */
.ki-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-5);
    align-items: start;
}

.ki-text .btn {
    margin-top: var(--space-3);
}

.ki-tools {
    background: var(--color-invert-bg);
    color: var(--color-invert-text);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
}

.ki-tools-title {
    font-size: 1.1rem;
    margin-bottom: var(--space-3);
    color: #fff;
}

.tool-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tool-list li {
    border: 1px solid rgba(255, 255, 255, 0.25);
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 500;
    color: #f0f0f0;
    transition: background var(--transition), border-color var(--transition);
}

.tool-list li:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.6);
}

.ki-tools-note {
    margin-top: var(--space-3);
    font-size: 0.85rem;
    color: #b0b0b0;
}

/* ---------- Schulungen / Features ---------- */
.feature-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2);
}

.feature {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: var(--space-3);
    border-radius: var(--radius);
    transition: transform var(--transition), box-shadow var(--transition);
}

.feature:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.feature-label {
    display: inline-block;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 0.7rem;
    font-weight: 800;
    color: #000;
    border: 1px solid #000;
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    margin-bottom: var(--space-2);
}

.feature p {
    color: var(--color-text-soft);
    font-size: 0.97rem;
}

/* ---------- Über ---------- */
.about-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-4);
    align-items: center;
}

.about-mark {
    display: none;
}

.about-text p {
    color: var(--color-text-soft);
    margin-bottom: var(--space-2);
}

.about-text p strong {
    color: var(--color-text);
}

.about-meta {
    margin-top: var(--space-3);
    display: grid;
    gap: var(--space-2);
}

.about-meta li {
    display: grid;
    gap: 0.15rem;
    padding-top: var(--space-2);
    border-top: 1px solid var(--color-border);
}

.about-meta span {
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 0.7rem;
    font-weight: 800;
    color: #999;
}

.about-meta strong {
    font-weight: 600;
    color: var(--color-text);
}

/* ---------- Kontakt ---------- */
.contact-section {
    background: var(--color-invert-bg);
    color: var(--color-invert-text);
}

.contact-inner {
    max-width: 760px;
    text-align: center;
}

.contact-title {
    font-size: clamp(1.7rem, 4vw, 2.6rem);
    color: #fff;
    margin-bottom: var(--space-2);
}

.contact-lead {
    color: #cfcfcf;
    margin-bottom: var(--space-4);
}

.contact-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    justify-content: center;
    margin-bottom: var(--space-5);
}

.contact-actions .btn {
    flex: 1 1 auto;
    min-width: 180px;
}

.contact-details {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2);
    margin-inline: auto;
    max-width: 520px;
}

.contact-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding-block: 0.6rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    transition: background var(--transition);
}

.contact-item:hover {
    background: rgba(255, 255, 255, 0.06);
}

.contact-item dt {
    color: #b0b0b0;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.contact-item dd {
    font-weight: 600;
}

.contact-item a {
    color: #fff;
    border-bottom: 1px solid rgba(255, 255, 255, 0.4);
    transition: border-color var(--transition);
}

.contact-item a:hover {
    border-bottom-color: #fff;
}

/* ---------- Footer ---------- */
.site-footer {
    background: #000;
    color: #d0d0d0;
    padding-top: var(--space-5);
}

.footer-inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-4);
    padding-bottom: var(--space-4);
}

.logo-footer {
    color: #fff;
    font-size: 1.1rem;
}

.logo-footer .logo-img {
    height: 120px;
}

@media (max-width: 640px) {
    .logo-footer .logo-img {
        height: 88px;
    }
}

.footer-tagline {
    margin-top: var(--space-1);
    color: #9a9a9a;
    font-size: 0.95rem;
}

.footer-contact p {
    color: #d0d0d0;
    margin-bottom: 0.25rem;
}

.footer-contact a {
    color: #fff;
}

.footer-contact a:hover {
    text-decoration: underline;
}

.footer-legal ul {
    display: flex;
    gap: var(--space-3);
}

.footer-legal a {
    color: #d0d0d0;
    text-decoration: underline;
    text-underline-offset: 3px;
}

.footer-legal a:hover {
    color: #fff;
}

.footer-bottom {
    border-top: 1px solid #2a2a2a;
    padding-block: var(--space-3);
}

.footer-bottom p {
    color: #8a8a8a;
    font-size: 0.85rem;
}

/* =========================================================
   Responsive — Tablet (>= 640px)
   ========================================================= */
@media (min-width: 640px) {
    .section {
        padding-block: var(--space-7);
    }

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

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

    .feature-row {
        grid-template-columns: repeat(3, 1fr);
    }

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

    .footer-inner {
        grid-template-columns: 2fr 1fr 1fr;
        align-items: start;
    }
}

/* =========================================================
   Responsive — Desktop (>= 960px)
   ========================================================= */
@media (min-width: 960px) {
    .container {
        padding-inline: 2rem;
    }

    .card-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .ki-layout {
        grid-template-columns: 1.4fr 1fr;
        gap: var(--space-6);
    }

    .about-layout {
        grid-template-columns: 280px 1fr;
        gap: var(--space-6);
    }

    .about-mark {
        display: flex;
        align-items: center;
        justify-content: center;
        background: var(--color-invert-bg);
        border-radius: var(--radius-lg);
        aspect-ratio: 1 / 1;
        padding: 2.5rem;
    }

    .about-logo {
        width: 100%;
        height: auto;
        max-width: 220px;
        filter: invert(1);
    }

    .hero-cta .btn {
        flex: 0 0 auto;
    }
}

/* =========================================================
   Mobile navigation (<= 860px)
   ========================================================= */
@media (max-width: 860px) {
    .nav-toggle {
        display: flex;
    }

    .primary-nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #fff;
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
        max-height: 0;
        overflow: hidden;
        transition: max-height 260ms ease;
    }

    .primary-nav.is-open {
        max-height: 440px;
    }

    .primary-nav ul {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: var(--space-2) 1.25rem var(--space-3);
    }

    .primary-nav li {
        border-bottom: 1px solid var(--color-border);
    }

    .primary-nav li:last-child {
        border-bottom: none;
    }

    .primary-nav a {
        display: block;
        padding: 0.9rem 0;
        border-bottom: none;
    }

    .primary-nav a.is-active {
        font-weight: 800;
    }

    .primary-nav .nav-cta {
        margin-top: var(--space-2);
        text-align: center;
    }

    .primary-nav .lang-item {
        padding-block: 0.9rem;
        text-align: center;
    }

    .primary-nav .lang-switch a {
        display: inline-block;
        padding: 0.25rem 0.45rem;
    }
}

/* ---------- Legal pages (impressum.html / datenschutz.html) ---------- */
.legal-page {
    padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

.legal-inner {
    max-width: 760px;
}

.legal-title {
    font-size: clamp(1.8rem, 5vw, 2.8rem);
    margin-bottom: 0.5rem;
}

.legal-back {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-weight: 600;
    margin-bottom: 2rem;
    border-bottom: 2px solid #000;
    padding-bottom: 2px;
    transition: color var(--transition), border-color var(--transition);
}

.legal-back:hover {
    color: var(--color-text-soft);
    border-bottom-color: var(--color-text-soft);
}

.legal-body h2 {
    font-size: 1.2rem;
    margin-top: 1.75rem;
    margin-bottom: 0.5rem;
}

.legal-body p,
.legal-body li {
    color: var(--color-text-soft);
    margin-bottom: 0.4rem;
}

.legal-body ul {
    padding-left: 1.2rem;
    list-style: disc;
}

.legal-body strong {
    color: var(--color-text);
}

.legal-note {
    margin-top: 2rem;
    padding: 1rem 1.25rem;
    background: var(--color-muted);
    border-left: 4px solid #000;
    border-radius: var(--radius);
    font-size: 0.9rem;
}

/* ---------- Scroll reveal (only when JS is active) ---------- */
.js .reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 600ms var(--ease-out), transform 600ms var(--ease-out);
    transition-delay: var(--reveal-delay, 0ms);
}

.js .reveal.is-visible {
    opacity: 1;
    transform: none;
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}