/* ===========================
   Design-Variablen / Theme
   =========================== */
:root {
    --bg-main: #020617;
    --bg-elevated: rgba(15, 23, 42, 0.85);
    --bg-glass: rgba(15, 23, 42, 0.6);
    --accent: #38bdf8;
    --accent-soft: rgba(56, 189, 248, 0.2);
    --accent-strong: #0ea5e9;
    --text-main: #e5e7eb;
    --text-muted: #9ca3af;
    --border-subtle: rgba(148, 163, 184, 0.25);
    --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.8);
    --radius-lg: 18px;
    --radius-xl: 24px;
    --transition-fast: 0.2s ease-out;
    --transition-normal: 0.3s ease-out;
}

/* ===========================
   Global Defaults
   =========================== */

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

html {
    scroll-behavior: smooth;
}

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text-main);
    background:
        radial-gradient(circle at 0% 0%, rgba(56, 189, 248, 0.15), transparent 55%),
        radial-gradient(circle at 100% 100%, rgba(129, 140, 248, 0.18), transparent 55%),
        #020617;
}

/* dezentes Grid im Hintergrund */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(148, 163, 184, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, 0.08) 1px, transparent 1px);
    background-size: 40px 40px;
    opacity: 0.35;
    pointer-events: none;
    z-index: -1;
}

body {
    display: flex;
    flex-direction: column;
}

/* ===========================
   Container & Sections
   =========================== */

.container {
    width: 100%;
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 5.5rem 0;
    position: relative;
    z-index: 0;
    opacity: 0;
    transform: translateY(24px);
    animation: sectionFadeIn 0.8s var(--transition-normal) forwards;
}

.section:nth-of-type(2) { animation-delay: 0.1s; }
.section:nth-of-type(3) { animation-delay: 0.2s; }
.section:nth-of-type(4) { animation-delay: 0.3s; }
.section:nth-of-type(5) { animation-delay: 0.4s; }
.section:nth-of-type(6) { animation-delay: 0.5s; }

@keyframes sectionFadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===========================
   Navigation / Header
   =========================== */

header {
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(20px);
    background: linear-gradient(
        to bottom,
        rgba(2, 6, 23, 0.92),
        rgba(2, 6, 23, 0.72)
    );
    border-bottom: 1px solid rgba(148, 163, 184, 0.3);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.85rem 1.5rem;
}

.navbar-brand {
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.navbar ul {
    list-style: none;
    display: flex;
    gap: 0.75rem;
    margin: 0;
    padding: 0;
}

.navbar li {
    position: relative;
}

.navbar a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.45rem 0.9rem;
    border-radius: 999px;
    font-size: 0.9rem;
    color: var(--text-muted);
    text-decoration: none;
    border: 1px solid transparent;
    transition: background-color var(--transition-fast),
                border-color var(--transition-fast),
                color var(--transition-fast),
                transform var(--transition-fast),
                box-shadow var(--transition-fast);
}

.navbar a:hover {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: #f9fafb;
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(56, 189, 248, 0.35);
}

.navbar a.active {
    background: linear-gradient(135deg, var(--accent-strong), #6366f1);
    color: #0b1120;
    border-color: transparent;
    box-shadow: 0 16px 40px rgba(59, 130, 246, 0.5);
}

/* ===========================
   Typografie
   =========================== */

h1, h2, h3 {
    margin: 0 0 0.75rem;
    line-height: 1.1;
    color: #f9fafb;
}

h1 {
    font-size: clamp(2.3rem, 3vw + 1rem, 3.2rem);
    letter-spacing: -0.03em;
}

h2 {
    font-size: clamp(1.7rem, 2.4vw, 2.1rem);
    margin-bottom: 1.25rem;
}

h3 {
    font-size: 1.1rem;
}

p, li {
    color: var(--text-muted);
    font-size: 0.98rem;
    line-height: 1.7;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title span {
    display: inline-block;
    font-size: 0.78rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

/* ===========================
   Hero Bereich (#start)
   =========================== */

#start.section {
    padding-top: 6.5rem;
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 2.75rem;
    align-items: center;
}

/* Linke Seite */
.hero-content {
    position: relative;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.85);
    border: 1px solid rgba(148, 163, 184, 0.6);
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.85);
    margin-bottom: 1rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.hero-badge-dot {
    width: 7px;
    height: 7px;
    border-radius: 999px;
    background: radial-gradient(circle, var(--accent-strong), #22c55e);
    box-shadow: 0 0 16px rgba(34, 197, 94, 0.75);
}

.hero-subtitle {
    margin-top: 0.5rem;
    max-width: 510px;
}

/* Hero Actions */
.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.85rem;
    margin-top: 1.75rem;
}

/* ===========================
   Buttons
   =========================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.7rem 1.3rem;
    border-radius: 999px;
    border: 1px solid transparent;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: transform var(--transition-fast),
                box-shadow var(--transition-fast),
                background var(--transition-fast),
                border-color var(--transition-fast),
                color var(--transition-fast);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-strong), #6366f1);
    color: #0b1120;
    box-shadow: 0 18px 38px rgba(59, 130, 246, 0.65);
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 22px 48px rgba(59, 130, 246, 0.8);
}

.btn-ghost {
    background: transparent;
    border-color: rgba(148, 163, 184, 0.6);
    color: var(--text-main);
}

.btn-ghost:hover {
    background: rgba(15, 23, 42, 0.85);
    transform: translateY(-2px);
    box-shadow: 0 14px 32px rgba(15, 23, 42, 0.8);
}

/* ===========================
   Hero Panel (3D-Card)
   =========================== */

.hero-panel {
    position: relative;
    border-radius: var(--radius-xl);
    padding: 1.8rem;
    background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.23), transparent 55%),
                radial-gradient(circle at bottom right, rgba(129, 140, 248, 0.18), transparent 55%),
                var(--bg-glass);
    border: 1px solid rgba(148, 163, 184, 0.4);
    box-shadow: var(--shadow-soft);
    transform-style: preserve-3d;
    transform: perspective(900px) rotateX(10deg) rotateY(-8deg) translateY(6px);
    transition: transform 0.45s ease, box-shadow 0.45s ease, border-color 0.45s ease;
}

.hero-panel:hover {
    transform: perspective(900px) rotateX(2deg) rotateY(-2deg) translateY(0);
    box-shadow: 0 24px 60px rgba(15, 23, 42, 0.95);
    border-color: rgba(56, 189, 248, 0.7);
}

.hero-panel-stat {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.9rem;
}

.hero-panel-stat span:first-child {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: var(--text-muted);
}

.hero-panel-stat strong {
    font-size: 1.5rem;
}

/* ===========================
   Karten / Services / Hosting
   =========================== */

.card-grid,
.services-grid,
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

.card,
.service-card {
    position: relative;
    border-radius: var(--radius-lg);
    padding: 1.4rem;
    background: linear-gradient(145deg, rgba(15, 23, 42, 0.96), rgba(15, 23, 42, 0.88));
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
    overflow: hidden;
    transform-style: preserve-3d;
    transform: translateY(0) translateZ(0);
    transition: transform var(--transition-normal),
                box-shadow var(--transition-normal),
                border-color var(--transition-normal),
                background var(--transition-normal);
}

.card::before,
.service-card::before {
    content: "";
    position: absolute;
    inset: -50%;
    opacity: 0;
    background: radial-gradient(circle at top, rgba(56, 189, 248, 0.25), transparent 60%);
    transform: translate3d(0, 40%, 0);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
    pointer-events: none;
}

.card:hover,
.service-card:hover {
    transform: translateY(-8px) translateZ(10px) rotateX(4deg) rotateY(-3deg);
    box-shadow: 0 26px 70px rgba(15, 23, 42, 0.95);
    border-color: rgba(56, 189, 248, 0.75);
    background: linear-gradient(150deg, rgba(15, 23, 42, 0.98), rgba(15, 23, 42, 1));
}

.card:hover::before,
.service-card:hover::before {
    opacity: 1;
    transform: translate3d(0, 15%, 0);
}

/* ===========================
   Referenzen – Grid & 3D-Karten
   =========================== */

.references-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.6rem;
}

/* Grundstyle für Referenzkarten */
.reference-item {
    position: relative;
    border-radius: 18px;
    padding: 1.4rem;
    background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.16), transparent 55%),
                rgba(15, 23, 42, 0.96);
    border: 1px solid rgba(148, 163, 184, 0.4);
    box-shadow: 0 18px 45px rgba(15, 23, 42, 0.9);
    overflow: hidden;
    transform-style: preserve-3d;
    transform: translateY(10px) scale(0.98);
    opacity: 0;
    animation: refFadeIn 0.7s ease-out forwards;
}

/* Staggered Animation */
.reference-item:nth-child(1) { animation-delay: 0.05s; }
.reference-item:nth-child(2) { animation-delay: 0.12s; }
.reference-item:nth-child(3) { animation-delay: 0.19s; }
.reference-item:nth-child(4) { animation-delay: 0.26s; }
.reference-item:nth-child(5) { animation-delay: 0.33s; }
.reference-item:nth-child(6) { animation-delay: 0.40s; }
.reference-item:nth-child(7) { animation-delay: 0.47s; }

@keyframes refFadeIn {
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Glowing Overlay für Hover */
.reference-item::before {
    content: "";
    position: absolute;
    inset: -40%;
    background: radial-gradient(circle at top, rgba(56, 189, 248, 0.35), transparent 60%);
    opacity: 0;
    transform: translate3d(0, 35%, 0);
    transition: opacity 0.35s ease, transform 0.35s ease;
    pointer-events: none;
}

/* Hover: 3D + Glow */
.reference-item:hover {
    transform: translateY(-10px) scale(1.01) rotateX(5deg) rotateY(-4deg);
    border-color: rgba(56, 189, 248, 0.85);
    box-shadow: 0 26px 70px rgba(15, 23, 42, 0.95);
}

.reference-item:hover::before {
    opacity: 1;
    transform: translate3d(0, 10%, 0);
}

/* Bildcontainer */
.reference-image {
    border-radius: 16px;
    overflow: hidden;
    margin-bottom: 0.9rem;
    border: 1px solid rgba(148, 163, 184, 0.5);
    position: relative;
}

/* Bild: Zoom + Parallax */
.reference-image img {
    display: block;
    width: 100%;
    height: 190px;
    object-fit: cover;
    transform: scale(1.03) translateY(0);
    filter: saturate(1.05) contrast(1.02);
    transition:
        transform 0.6s cubic-bezier(0.19, 1, 0.22, 1),
        filter 0.6s ease;
}

.reference-item:hover .reference-image img {
    transform: scale(1.09) translateY(-6px);
    filter: saturate(1.15) contrast(1.05);
}

/* Texte in Referenzen */
.reference-item h3 {
    margin-bottom: 0.35rem;
}

.reference-item ul {
    margin: 0.5rem 0 0;
    padding-left: 1.1rem;
}

.reference-item li {
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

/* ===========================
   Formular / Kontakt
   =========================== */

form {
    display: grid;
    gap: 1rem;
}

label {
    font-size: 0.87rem;
    color: var(--text-main);
}

input,
textarea {
    width: 100%;
    padding: 0.75rem 0.9rem;
    border-radius: 12px;
    border: 1px solid rgba(148, 163, 184, 0.5);
    background: rgba(15, 23, 42, 0.95);
    color: var(--text-main);
    font-size: 0.9rem;
    outline: none;
    transition: border-color var(--transition-fast),
                box-shadow var(--transition-fast),
                background var(--transition-fast),
                transform var(--transition-fast);
}

input::placeholder,
textarea::placeholder {
    color: rgba(148, 163, 184, 0.8);
}

input:focus,
textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.5), 0 18px 35px rgba(15, 23, 42, 0.9);
    background: rgba(15, 23, 42, 1);
    transform: translateY(-1px);
}

/* ===========================
   Footer
   =========================== */

footer {
    margin-top: auto;
    border-top: 1px solid rgba(148, 163, 184, 0.3);
    background: linear-gradient(
        to top,
        rgba(2, 6, 23, 1),
        rgba(2, 6, 23, 0.92)
    );
    padding: 1.6rem 0 1.4rem;
}

.footer-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 0.75rem;
    align-items: center;
    font-size: 0.82rem;
}

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

footer a:hover {
    opacity: 0.7;
}

/* ===========================
   Sonstiges / Helfer
   =========================== */

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

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    font-size: 0.7rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    background: rgba(15, 23, 42, 0.9);
    border: 1px solid rgba(148, 163, 184, 0.6);
    color: var(--text-muted);
}

/* ===========================
   Responsive
   =========================== */

@media (max-width: 960px) {
    .hero-grid {
        grid-template-columns: 1fr;
    }

    .hero-panel {
        order: -1;
        margin-bottom: 1.5rem;
    }

    .navbar {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.7rem;
    }

    .navbar ul {
        flex-wrap: wrap;
        justify-content: flex-start;
    }
}

@media (max-width: 640px) {
    .section {
        padding: 4rem 0;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .footer-container {
        flex-direction: column;
        align-items: flex-start;
    }
}