/* ==========================================================================
   cberthun.de – Designsystem
   ========================================================================== */

@font-face {
    font-family: "Space Grotesk";
    src: url("/assets/fonts/space-grotesk.woff2") format("woff2");
    font-weight: 300 700;
    font-style: normal;
    font-display: swap;
}
@font-face {
    font-family: "JetBrains Mono";
    src: url("/assets/fonts/jetbrains-mono.woff2") format("woff2");
    font-weight: 100 800;
    font-style: normal;
    font-display: swap;
}

:root {
    --bg: #0b0c0e;
    --bg-1: #101216;
    --bg-2: #15181d;
    --line: #22262d;
    --line-2: #31363f;
    --text: #eceef2;
    --muted: #a0a8b4;
    --dim: #7b8493;
    --accent: #3985f6;
    --accent-soft: rgba(57, 133, 246, .12);
    --ok: #4cc38a;
    --warn: #d6a64a;

    --font-sans: "Space Grotesk", system-ui, -apple-system, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
    --font-mono: "JetBrains Mono", ui-monospace, "Cascadia Code", "SF Mono", Consolas, "Liberation Mono", monospace;

    --container: 1160px;
    --gutter: clamp(20px, 4vw, 40px);
    --header-h: 64px;
    --radius: 4px;
    --ease: cubic-bezier(.2, .7, .2, 1);
    --t: 180ms;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-h) + 16px);
    -webkit-text-size-adjust: 100%;
    background: var(--bg);
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

h1, h2, h3, p, ul, ol, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent); color: #fff; }

.mono { font-family: var(--font-mono); letter-spacing: .02em; }

.container {
    width: 100%;
    max-width: calc(var(--container) + var(--gutter) * 2);
    margin-inline: auto;
    padding-inline: var(--gutter);
}

.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;
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 2px;
}

.skip-link {
    position: absolute; left: 12px; top: -60px; z-index: 100;
    background: var(--accent); color: #fff; padding: 10px 16px; border-radius: var(--radius);
    transition: top var(--t) var(--ease);
}
.skip-link:focus { top: 12px; }

/* --- Header ------------------------------------------------------------- */

.site-header {
    position: sticky; top: 0; z-index: 50;
    height: var(--header-h);
    background: rgba(11, 12, 14, .88);
    border-bottom: 1px solid transparent;
    transition: border-color var(--t) var(--ease), background var(--t) var(--ease);
}
@supports (backdrop-filter: blur(1px)) {
    .site-header { background: rgba(11, 12, 14, .72); backdrop-filter: blur(10px); }
}
.site-header.is-scrolled { border-bottom-color: var(--line); background: rgba(11, 12, 14, .92); }

.header-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 24px; }

.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: .14em; font-size: .8125rem; }
.brand-mark { display: block; height: 22px; width: auto; transition: transform var(--t) var(--ease); }
.brand:hover .brand-mark { transform: translateY(-1px); }

.site-nav ul { display: flex; align-items: center; gap: clamp(16px, 2.6vw, 34px); }
.site-nav a {
    position: relative; display: inline-block; padding: 6px 0;
    font-size: .875rem; color: var(--muted);
    transition: color var(--t) var(--ease);
}
.site-nav a::after {
    content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px;
    background: var(--accent); transform: scaleX(0); transform-origin: left;
    transition: transform var(--t) var(--ease);
}
.site-nav a:hover, .site-nav a.is-active { color: var(--text); }
.site-nav a:hover::after, .site-nav a.is-active::after { transform: scaleX(1); }

.site-nav .nav-contact {
    color: var(--text); padding: 7px 14px;
    border: 1px solid var(--line-2); border-radius: var(--radius);
    transition: border-color var(--t) var(--ease), background var(--t) var(--ease);
}
.site-nav .nav-contact::after { display: none; }
.site-nav .nav-contact:hover, .site-nav .nav-contact.is-active { border-color: var(--accent); background: var(--accent-soft); }

.nav-toggle {
    display: none; align-items: center; gap: 10px;
    background: none; border: 1px solid var(--line-2); border-radius: var(--radius);
    color: var(--text); font: inherit; font-size: .8125rem; padding: 7px 12px; cursor: pointer;
    transition: border-color var(--t) var(--ease);
}
.nav-toggle:hover { border-color: var(--accent); }
.nav-toggle-bars { position: relative; width: 16px; height: 8px; }
.nav-toggle-bars i { position: absolute; left: 0; width: 100%; height: 1.5px; background: currentColor; transition: transform var(--t) var(--ease), top var(--t) var(--ease); }
.nav-toggle-bars i:first-child { top: 0; }
.nav-toggle-bars i:last-child { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:first-child { top: 3px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:last-child { top: 3px; transform: rotate(-45deg); }

/* Mobile-Navigation (nur mit JS einklappbar; ohne JS bleibt die Liste sichtbar) */
@media (max-width: 760px) {
    .site-header { height: auto; min-height: var(--header-h); }
    .header-inner { flex-wrap: wrap; padding-block: 14px; height: auto; }
    .site-nav { flex-basis: 100%; }
    .site-nav ul { flex-direction: column; align-items: stretch; gap: 0; padding-top: 8px; }
    .site-nav li { border-top: 1px solid var(--line); }
    .site-nav a { display: block; padding: 14px 0; font-size: 1rem; }
    .site-nav a::after { display: none; }
    .site-nav .nav-contact { margin-top: 12px; padding: 12px 14px; text-align: center; }

    .js .nav-toggle { display: inline-flex; }
    .js .site-nav { display: none; }
    .js .site-nav.is-open { display: block; }
    .js .site-header { position: sticky; }
}

/* --- Buttons ------------------------------------------------------------ */

.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 10px;
    padding: 13px 22px; border-radius: var(--radius);
    font-size: .9375rem; font-weight: 500; line-height: 1.2;
    border: 1px solid transparent;
    transition: background var(--t) var(--ease), border-color var(--t) var(--ease), transform var(--t) var(--ease), color var(--t) var(--ease);
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #4d93fa; }
.btn-ghost { border-color: var(--line-2); color: var(--text); }
.btn-ghost:hover { border-color: var(--muted); background: rgba(255, 255, 255, .03); }

/* --- Hero --------------------------------------------------------------- */

.hero { position: relative; border-bottom: 1px solid var(--line); }
.hero-grid {
    display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center; gap: clamp(24px, 5vw, 72px);
    min-height: min(820px, calc(100svh - var(--header-h)));
    padding-block: clamp(48px, 9vh, 96px);
}

.eyebrow { display: flex; align-items: center; gap: 12px; font-size: .75rem; color: var(--muted); margin-bottom: 28px; }

.dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--dim); flex: none; }
.dot-live { background: var(--ok); box-shadow: 0 0 0 0 rgba(76, 195, 138, .5); animation: pulse 2.6s ease-out infinite; }
@keyframes pulse { 70%, 100% { box-shadow: 0 0 0 7px rgba(76, 195, 138, 0); } }

.hero-title { font-size: clamp(2.6rem, 7.2vw, 5.6rem); line-height: 1.02; letter-spacing: -.035em; font-weight: 600; }
.hero-title .line { display: block; }
.hero-title .line-accent { color: var(--muted); }
.hero-title .period { color: var(--accent); }

.hero-lead { margin-top: 28px; max-width: 54ch; font-size: clamp(1.02rem, 1.4vw, 1.15rem); color: var(--muted); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }

.hero-meta { display: flex; flex-wrap: wrap; gap: 12px 40px; margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--line); font-size: .75rem; }
.hero-meta dt { color: var(--dim); text-transform: uppercase; letter-spacing: .12em; font-size: .6875rem; margin-bottom: 2px; }
.hero-meta dd { display: flex; align-items: center; gap: 8px; color: var(--text); }

.hero-visual { color: var(--line-2); justify-self: end; width: 100%; max-width: 460px; }
.mono-art { width: 100%; height: auto; overflow: visible; }
.mono-art .layer { transition: transform 400ms var(--ease); }
.mono-art .layer-grid { color: var(--line); }
.mono-art .layer-rings circle, .mono-art .layer-rings path { stroke: var(--line-2); }
.mono-art .layer-mark rect { fill: var(--text); }
.mono-art .layer-tags { color: var(--dim); }

@media (min-width: 761px) {
    .mono-art .layer-grid  { transform: translate(calc(var(--mx, 0) * -4px), calc(var(--my, 0) * -4px)); }
    .mono-art .layer-rings { transform: translate(calc(var(--mx, 0) * 8px),  calc(var(--my, 0) * 8px)); }
    .mono-art .layer-mark  { transform: translate(calc(var(--mx, 0) * 16px), calc(var(--my, 0) * 16px)); }
}

.hero-copy > * { animation: rise 700ms var(--ease) both; }
.hero-copy > :nth-child(2) { animation-delay: 70ms; }
.hero-copy > :nth-child(3) { animation-delay: 140ms; }
.hero-copy > :nth-child(4) { animation-delay: 210ms; }
.hero-copy > :nth-child(5) { animation-delay: 280ms; }
.hero-visual { animation: fade 900ms var(--ease) 200ms both; }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } }
@keyframes fade { from { opacity: 0; } }

@media (max-width: 900px) {
    .hero-grid { grid-template-columns: 1fr; min-height: 0; }
    .hero-visual { order: -1; justify-self: start; max-width: 220px; margin-bottom: 8px; }
    .mono-art .layer-tags { display: none; }
}

/* --- Sections ----------------------------------------------------------- */

.section { padding-block: clamp(72px, 12vw, 140px); border-bottom: 1px solid var(--line); }
.section-tight { padding-block: clamp(56px, 8vw, 96px); }
.section-label { font-size: .75rem; color: var(--accent); margin-bottom: 28px; text-transform: uppercase; letter-spacing: .14em; }
.section-title { font-size: clamp(2rem, 4.6vw, 3.4rem); line-height: 1.08; letter-spacing: -.03em; font-weight: 600; }
.section-sub { margin-top: 14px; color: var(--muted); max-width: 52ch; }
.section-intro { margin-bottom: clamp(36px, 6vw, 64px); }
.lead { font-size: clamp(1.05rem, 1.5vw, 1.2rem); color: var(--text); }

/* About */
.about-grid { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 6fr); gap: clamp(28px, 6vw, 96px); align-items: start; }
.about-body { display: grid; gap: 22px; color: var(--muted); max-width: 60ch; }
.about-body .lead { color: var(--text); }
.facts { margin-top: 12px; border-top: 1px solid var(--line); font-size: .8125rem; }
.facts div { display: grid; grid-template-columns: 7rem 1fr; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.facts dt { color: var(--dim); text-transform: uppercase; letter-spacing: .1em; font-size: .6875rem; padding-top: 2px; }
.facts dd { color: var(--text); }
@media (max-width: 860px) { .about-grid { grid-template-columns: 1fr; } }

/* Tech stack */
.stack-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; margin-top: clamp(40px, 6vw, 72px); border-top: 1px solid var(--line); }
.stack-group { padding: 28px 28px 8px 0; }
.stack-group + .stack-group { padding-left: 28px; border-left: 1px solid var(--line); }
.stack-heading { font-size: .75rem; font-weight: 400; color: var(--accent); text-transform: uppercase; letter-spacing: .12em; margin-bottom: 20px; }
.stack-text { margin: -8px 0 22px; color: var(--muted); font-size: .9375rem; max-width: 34ch; }
.stack-list li { display: flex; align-items: baseline; gap: 14px; padding: 12px 0; border-top: 1px solid var(--line); transition: padding-left var(--t) var(--ease); }
.stack-list li:first-child { border-top: 0; padding-top: 0; }
.stack-list li:hover { padding-left: 6px; }
.stack-no { font-size: .6875rem; color: var(--dim); }
.stack-name { font-size: clamp(1.15rem, 1.8vw, 1.45rem); letter-spacing: -.015em; line-height: 1.3; }

@media (max-width: 860px) {
    .stack-grid { grid-template-columns: 1fr; }
    .stack-group, .stack-group + .stack-group { padding: 28px 0 12px; border-left: 0; }
    .stack-group + .stack-group { border-top: 1px solid var(--line); }
}

/* Principles */
.principles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.principle { padding: 28px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-1); }
.principle-no { font-size: .75rem; color: var(--dim); }
.principle h3 { margin-top: 36px; font-size: 1.5rem; letter-spacing: -.02em; font-weight: 600; }
.principle p { margin-top: 10px; color: var(--muted); }
@media (max-width: 860px) { .principles { grid-template-columns: 1fr; } .principle h3 { margin-top: 20px; } }

/* Contact */
#contact { border-bottom: 0; }
.contact-grid { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: clamp(32px, 6vw, 96px); align-items: end; }
.contact-text { margin-top: 24px; color: var(--muted); max-width: 48ch; }
.channels { border-top: 1px solid var(--line); }
.channel {
    display: grid; grid-template-columns: 6rem 1fr auto; align-items: baseline; gap: 16px;
    padding: 20px 0; border-bottom: 1px solid var(--line);
    transition: padding var(--t) var(--ease), color var(--t) var(--ease);
}
.channel-label { font-size: .6875rem; color: var(--dim); text-transform: uppercase; letter-spacing: .12em; }
.channel-value { font-size: 1.1rem; overflow-wrap: anywhere; }
.channel-arrow { color: var(--accent); transition: transform var(--t) var(--ease); }
.channel:hover { padding-inline: 8px; color: var(--accent); }
.channel:hover .channel-arrow { transform: translateX(3px); }
.channel-empty { padding: 18px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); font-size: .8125rem; color: var(--dim); }
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; align-items: start; } }

/* Kontaktformular */
.contact-grid { align-items: start; }
.contact-form { display: grid; gap: 22px; }
.field { display: grid; gap: 8px; }
.field label { font-size: .8125rem; color: var(--muted); }
.field input[type="text"], .field input[type="email"], .field textarea {
    width: 100%; padding: 13px 14px; font: inherit; color: var(--text);
    background: var(--bg-1); border: 1px solid var(--line-2); border-radius: var(--radius);
    transition: border-color var(--t) var(--ease), background var(--t) var(--ease);
}
.field textarea { resize: vertical; min-height: 140px; }
.field input:hover, .field textarea:hover { border-color: var(--dim); }
.field input:focus-visible, .field textarea:focus-visible { outline: none; border-color: var(--accent); background: var(--bg-2); box-shadow: 0 0 0 3px var(--accent-soft); }
.field [aria-invalid="true"] { border-color: #e5645a; }
.field-error { font-size: .8125rem; color: #ef8a82; }
.field-check { grid-template-columns: auto 1fr; align-items: start; column-gap: 12px; }
.field-check input { margin-top: 4px; accent-color: var(--accent); width: 16px; height: 16px; }
.field-check label a { color: var(--text); border-bottom: 1px solid var(--line-2); }
.field-check .field-error { grid-column: 1 / -1; }
.field-trap { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.contact-form .btn { justify-self: start; cursor: pointer; font-family: inherit; }
.contact-form .btn:disabled { opacity: .6; cursor: progress; }
.form-status { margin-bottom: 22px; padding: 14px 16px; border: 1px solid var(--line-2); border-radius: var(--radius); font-size: .9375rem; }
.form-status-ok { border-color: var(--ok); color: var(--ok); }
.form-status-error { border-color: #e5645a; color: #ef8a82; }
.contact-grid .channels { margin-top: 32px; }

/* --- Footer ------------------------------------------------------------- */

.site-footer { border-top: 1px solid var(--line); padding-block: 28px; font-size: .8125rem; color: var(--dim); }
.footer-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 32px; }
.footer-links { display: flex; gap: 24px; }
.footer-links a { color: var(--muted); transition: color var(--t) var(--ease); }
.footer-links a:hover { color: var(--text); }
.footer-meta { font-size: .75rem; }

/* --- Rechtstexte -------------------------------------------------------- */

.legal { padding-block: clamp(56px, 9vw, 112px); min-height: 70svh; }
.legal-inner { max-width: 760px; }
.legal h1 { font-size: clamp(2rem, 5vw, 3rem); letter-spacing: -.03em; line-height: 1.1; font-weight: 600; margin-bottom: 40px; }
.legal h2 { font-size: 1.2rem; margin-top: 40px; margin-bottom: 10px; letter-spacing: -.01em; font-weight: 600; }
.legal p, .legal li { color: var(--muted); }
.legal p + p { margin-top: 12px; }
.legal ul { list-style: disc; padding-left: 1.2em; display: grid; gap: 6px; margin-top: 10px; }
.legal a { color: var(--text); border-bottom: 1px solid var(--line-2); }
.legal a:hover { color: var(--accent); border-color: var(--accent); }
.legal address { font-style: normal; color: var(--text); line-height: 1.8; }
.todo { display: inline-block; padding: 0 6px; border: 1px dashed var(--warn); border-radius: 2px; color: var(--warn); font-family: var(--font-mono); font-size: .85em; }
.notice { margin-bottom: 36px; padding: 14px 16px; border: 1px solid var(--warn); border-radius: var(--radius); color: var(--warn); font-size: .875rem; }
.notfound { display: grid; place-content: start; gap: 16px; }
.notfound .code { font-size: clamp(5rem, 18vw, 11rem); line-height: 1; letter-spacing: -.05em; color: var(--accent); font-weight: 600; }
.notfound .btn { justify-self: start; margin-top: 12px; }

/* --- Scroll-Einblendung (progressive Verbesserung) ---------------------- */

.js .reveal { opacity: 0; transform: translateY(16px); transition: opacity 600ms var(--ease), transform 600ms var(--ease); }
.js .reveal.is-visible { opacity: 1; transform: none; }

/* --- Reduzierte Bewegung ------------------------------------------------ */

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation: none !important; transition-duration: 1ms !important; }
    .js .reveal { opacity: 1; transform: none; }
    .mono-art .layer { transform: none !important; }
}