/* Julian Theis · Apps für die Schule — © 2026 Julian Theis */
@font-face{font-family:"Geist";font-style:normal;font-weight:100 900;font-display:swap;src:url(fonts/geist-latin-wght-normal.woff2) format("woff2")}
@font-face{font-family:"Geist";font-style:normal;font-weight:100 900;font-display:swap;src:url(fonts/geist-latin-ext-wght-normal.woff2) format("woff2");unicode-range:U+0100-02AF,U+0304,U+0308,U+0329,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Geist Mono";font-style:normal;font-weight:100 900;font-display:swap;src:url(fonts/geist-mono-latin-wght-normal.woff2) format("woff2")}

:root{
  --bg:#f7f7f5; --bg-2:#efefec; --card:#ffffff; --ink:#111214; --ink-2:#4a4d55; --ink-3:#7b7f88;
  --line:#e3e3df; --line-2:#d5d5d0; --accent:#2f5bea; --accent-ink:#ffffff; --accent-soft:#e8eeff;
  --ok:#0f7a5a; --ok-soft:#e3f4ec; --warn:#9a5b00; --warn-soft:#fdf1dc;
  --shadow:0 1px 2px rgba(17,18,20,.05),0 8px 24px -12px rgba(17,18,20,.12);
  --shadow-lg:0 2px 4px rgba(17,18,20,.04),0 24px 60px -24px rgba(17,18,20,.28);
  --r:14px; --r-lg:22px;
  --sans:"Geist",-apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif;
  --mono:"Geist Mono",ui-monospace,"SFMono-Regular",Consolas,monospace;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#0c0d10; --bg-2:#131418; --card:#16181d; --ink:#f2f2f0; --ink-2:#b4b7be; --ink-3:#83868e;
  --line:#25272d; --line-2:#30333a; --accent:#7c9bff; --accent-ink:#0c0d10; --accent-soft:#1a2340;
  --ok:#4fd1a1; --ok-soft:#10261f; --warn:#f2b45c; --warn-soft:#2a2112;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px -12px rgba(0,0,0,.6);
  --shadow-lg:0 2px 4px rgba(0,0,0,.3),0 24px 60px -24px rgba(0,0,0,.8);
  color-scheme:dark;
}}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:400 16.5px/1.6 var(--sans);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
p{margin:0 0 1em}
h1,h2,h3{margin:0;text-wrap:balance;letter-spacing:-.025em;line-height:1.1}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px}
.wrap{max-width:1120px;margin:0 auto;padding-inline:24px}
.narrow{max-width:760px}
@media (max-width:560px){.wrap{padding-inline:18px}body{font-size:16px}}

/* Header */
.top{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 82%,transparent);-webkit-backdrop-filter:saturate(1.4) blur(14px);backdrop-filter:saturate(1.4) blur(14px);border-bottom:1px solid transparent;transition:border-color .2s}
.top.scrolled{border-bottom-color:var(--line)}
.top .wrap{display:flex;align-items:center;gap:20px;height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:620;letter-spacing:-.02em;font-size:16px;white-space:nowrap}
.brand .mark{width:26px;height:26px;border-radius:8px;background:var(--ink);color:var(--bg);display:grid;place-items:center;font:700 13px/1 var(--sans);letter-spacing:-.04em}
.brand span{color:var(--ink-3);font-weight:450}
.nav{margin-left:auto;display:flex;gap:4px;align-items:center}
.nav a{text-decoration:none;color:var(--ink-2);font-size:14.5px;padding:7px 11px;border-radius:9px}
.nav a:hover{color:var(--ink);background:var(--bg-2)}
.nav a[aria-current]{color:var(--ink);font-weight:550}
@media (max-width:640px){.nav .hide-sm{display:none}.brand span{display:none}.top .wrap{gap:10px}.nav{gap:0}.nav a{padding:7px 8px;font-size:14px}}
@media (max-width:380px){.brand{font-size:0;gap:0}.brand .mark{font-size:13px}}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 20px;border-radius:12px;font:550 15px/1 var(--sans);text-decoration:none;border:1px solid transparent;cursor:pointer;transition:transform .15s,background .15s,border-color .15s;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--ink);color:var(--bg)}
.btn-primary:hover{background:color-mix(in srgb,var(--ink) 86%,var(--accent))}
.btn-ghost{background:var(--card);color:var(--ink);border-color:var(--line-2)}
.btn-ghost:hover{border-color:var(--ink-3)}
.btn-accent{background:var(--accent);color:var(--accent-ink)}
.btn small{font-weight:450;opacity:.7;font-size:13px}
.btn svg{width:17px;height:17px;flex:none}
.btns{display:flex;flex-wrap:wrap;gap:10px}

/* Hero */
.hero{padding-block:88px 56px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font:500 13px/1 var(--mono);color:var(--ink-2);letter-spacing:.02em;padding:7px 11px;border:1px solid var(--line-2);border-radius:999px;background:var(--card)}
.eyebrow i{width:7px;height:7px;border-radius:50%;background:var(--ok);font-style:normal}
.hero h1{font-size:clamp(40px,6.4vw,72px);font-weight:640;margin:22px 0 20px;max-width:17ch}
.hero h1 em{font-style:normal;color:var(--ink-3)}
.lead{font-size:clamp(17px,2vw,20px);color:var(--ink-2);max-width:56ch;margin-bottom:30px;line-height:1.55}
@media (max-width:560px){.hero{padding-block:56px 36px}}

/* Section */
section{padding-block:56px}
.sec-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:28px;flex-wrap:wrap}
.sec-head h2{font-size:clamp(28px,3.6vw,40px);font-weight:620}
.sec-head p{color:var(--ink-2);margin:0;max-width:46ch}
.label{font:500 12.5px/1 var(--mono);text-transform:uppercase;letter-spacing:.08em;color:var(--ink-3);margin-bottom:12px;display:block}

/* App cards */
.apps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
@media (max-width:920px){.apps{grid-template-columns:1fr}}
.app{position:relative;display:flex;flex-direction:column;gap:14px;padding:26px;border-radius:var(--r-lg);background:var(--card);border:1px solid var(--line);text-decoration:none;box-shadow:var(--shadow);transition:transform .2s,box-shadow .2s,border-color .2s;min-width:0}
.app:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--line-2)}
.app .icon{width:64px;height:64px;border-radius:16px;filter:drop-shadow(0 6px 10px rgba(0,0,0,.18))}
.app h3{font-size:24px;font-weight:620}
.app .tag{color:var(--ink-3);font-size:14.5px;margin-top:-6px}
.app p{color:var(--ink-2);margin:0;font-size:15.5px}
.app .meta{margin-top:auto;padding-top:16px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:14px;color:var(--ink-2)}
.app .go{font-weight:560;color:var(--ink);display:inline-flex;gap:6px;align-items:center}
.app .go::after{content:"→";transition:transform .2s}
.app:hover .go::after{transform:translateX(3px)}
.pill{display:inline-flex;align-items:center;gap:6px;font:500 12.5px/1 var(--sans);padding:6px 9px;border-radius:999px;background:var(--bg-2);color:var(--ink-2);white-space:nowrap}
.pill.ok{background:var(--ok-soft);color:var(--ok)}
.pill.warn{background:var(--warn-soft);color:var(--warn)}
.pills{display:flex;flex-wrap:wrap;gap:6px}

/* Principles */
.principles{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0;border:1px solid var(--line);border-radius:var(--r-lg);background:var(--card);overflow:hidden}
.principles>div{padding:24px;border-right:1px solid var(--line);min-width:0}
.principles>div:last-child{border-right:0}
.principles h3{font-size:17px;font-weight:600;letter-spacing:-.01em;margin:14px 0 6px}
.principles p{color:var(--ink-2);font-size:14.5px;margin:0;line-height:1.5}
.principles svg{width:22px;height:22px;color:var(--ink)}
@media (max-width:920px){.principles{grid-template-columns:1fr 1fr}.principles>div:nth-child(2){border-right:0}.principles>div:nth-child(-n+2){border-bottom:1px solid var(--line)}}
@media (max-width:520px){.principles{grid-template-columns:1fr}.principles>div{border-right:0;border-bottom:1px solid var(--line)}.principles>div:last-child{border-bottom:0}}

/* Split / about / support */
.split{display:grid;grid-template-columns:1.1fr 1fr;gap:48px;align-items:start}
@media (max-width:860px){.split{grid-template-columns:1fr;gap:28px}}
.panel{border-radius:var(--r-lg);border:1px solid var(--line);background:var(--card);padding:30px;box-shadow:var(--shadow)}
.support{background:var(--ink);color:var(--bg);border-color:transparent}
.support h2{font-size:clamp(26px,3vw,34px);font-weight:620;margin-bottom:12px}
.support p{color:color-mix(in srgb,var(--bg) 72%,transparent)}
.support .btn-primary{background:var(--bg);color:var(--ink)}
.support .fine{font-size:13.5px;margin:16px 0 0}
.prose p,.prose li{color:var(--ink-2)}
.prose h2{font-size:clamp(26px,3vw,34px);font-weight:620;margin-bottom:14px}
.prose h3{font-size:19px;font-weight:600;margin:30px 0 8px;letter-spacing:-.01em}
.prose ul,.prose ol{padding-left:1.2em;margin:0 0 1em}
.prose li{margin:.3em 0}
.prose strong{color:var(--ink);font-weight:600}
.prose a{color:var(--accent);text-underline-offset:3px}
.prose code{font:500 .9em var(--mono);background:var(--bg-2);padding:2px 6px;border-radius:6px}
.note{font-size:14.5px;color:var(--ink-2);padding:14px 16px;border-radius:12px;background:var(--bg-2);border:1px solid var(--line)}
.note.warn{background:var(--warn-soft);border-color:transparent;color:var(--ink)}
.todo{background:#fff3a3;color:#3d3300;padding:0 4px;border-radius:4px;font-weight:600}

/* App page */
.apphero{padding-block:64px 32px;display:grid;grid-template-columns:auto 1fr;gap:28px;align-items:center}
.apphero .icon{width:112px;height:112px;border-radius:26px;filter:drop-shadow(0 12px 20px rgba(0,0,0,.2))}
.apphero h1{font-size:clamp(40px,6vw,64px);font-weight:650}
.apphero .sub{font-size:clamp(17px,2vw,20px);color:var(--ink-2);margin:10px 0 0;max-width:52ch}
@media (max-width:620px){.apphero{grid-template-columns:1fr;gap:18px;padding-block:40px 20px}.apphero .icon{width:84px;height:84px;border-radius:20px}}
.cta{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin:8px 0 6px}
.cta .fine{color:var(--ink-3);font-size:14px}
.shot{border-radius:var(--r-lg);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow-lg);background:var(--card)}
.shot img{width:100%}
.shots{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media (max-width:760px){.shots{grid-template-columns:1fr}}
figure{margin:0}
figcaption{font-size:14px;color:var(--ink-3);margin-top:10px}
.features{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px 32px}
@media (max-width:860px){.features{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.features{grid-template-columns:1fr}}
.features h3{font-size:17px;font-weight:600;letter-spacing:-.01em;margin-bottom:6px}
.features p{color:var(--ink-2);font-size:15px;margin:0;line-height:1.55}
.features .n{font:500 13px/1 var(--mono);color:var(--ink-3);display:block;margin-bottom:12px}
.steps{counter-reset:s;list-style:none;padding:0;margin:0;display:grid;gap:12px}
.steps li{counter-increment:s;position:relative;padding:16px 18px 16px 58px;border:1px solid var(--line);border-radius:var(--r);background:var(--card);color:var(--ink-2)}
.steps li::before{content:counter(s);position:absolute;left:16px;top:15px;width:28px;height:28px;border-radius:9px;background:var(--bg-2);color:var(--ink);display:grid;place-items:center;font:600 14px/1 var(--mono)}
.steps li strong{color:var(--ink);font-weight:600}
.specs{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.specs>div{background:var(--card);padding:16px 18px;min-width:0}
.specs dt{font:500 12px/1 var(--mono);text-transform:uppercase;letter-spacing:.07em;color:var(--ink-3);margin-bottom:8px}
.specs dd{margin:0;font-weight:550;font-size:15px}
@media (max-width:760px){.specs{grid-template-columns:1fr 1fr}}
.tabs-os{display:inline-flex;gap:4px;padding:4px;border-radius:12px;background:var(--bg-2);margin-bottom:14px}
.tabs-os button{border:0;background:none;font:500 14px/1 var(--sans);padding:9px 14px;border-radius:9px;color:var(--ink-2);cursor:pointer}
.tabs-os button[aria-selected="true"]{background:var(--card);color:var(--ink);box-shadow:var(--shadow)}

/* Footer */
footer{margin-top:56px;border-top:1px solid var(--line);padding-block:36px 48px;color:var(--ink-3);font-size:14px}
footer .wrap{display:flex;flex-wrap:wrap;gap:12px 28px;align-items:center;justify-content:space-between}
footer nav{display:flex;flex-wrap:wrap;gap:6px 20px}
footer a{text-decoration:none;color:var(--ink-2)}
footer a:hover{color:var(--ink)}
.kicker{font-size:13px;color:var(--ink-3)}

/* ---- theis Branding ---- */
.brand{gap:12px}
.brand .mark{display:none}
.brand .logo{height:24px;width:auto;display:block;color:var(--ink);overflow:visible}
.brand .logo .dot{fill:#2F5BEA}
.brand span{color:var(--ink-3);font-weight:450;font-size:14.5px;padding-left:12px;border-left:1px solid var(--line-2);line-height:1.1}
@media (prefers-color-scheme:dark){.brand .logo .dot{fill:#6E8BFF}}
@media (max-width:640px){.brand span{display:none}}

/* ---- Downloads ---- */
.dls{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:10px 0 4px}
@media (max-width:900px){.dls{grid-template-columns:1fr 1fr}}
@media (max-width:420px){.dls{grid-template-columns:1fr}}
.dl{display:flex;align-items:center;gap:14px;padding:16px 18px;border-radius:var(--r);background:var(--card);border:1px solid var(--line);text-decoration:none;box-shadow:var(--shadow);transition:transform .15s,border-color .15s,box-shadow .15s;min-width:0}
.dl:hover{transform:translateY(-2px);border-color:var(--line-2);box-shadow:var(--shadow-lg)}
.dl:first-child{background:var(--ink);color:var(--bg);border-color:transparent}
.dl-ic{width:40px;height:40px;border-radius:11px;background:var(--bg-2);display:grid;place-items:center;flex:none;color:var(--ink)}
.dl:first-child .dl-ic{background:color-mix(in srgb,var(--bg) 14%,transparent);color:var(--bg)}
.dl-ic svg{width:21px;height:21px}
.dl strong{display:block;font-weight:600;font-size:16px;letter-spacing:-.01em}
.dl small{display:block;font-size:13px;color:var(--ink-3);margin-top:1px}
.dl:first-child small{color:color-mix(in srgb,var(--bg) 65%,transparent)}

/* ---- Installationshinweise ---- */
.howto{display:grid;gap:10px}
.howto details{border:1px solid var(--line);border-radius:var(--r);background:var(--card);overflow:hidden}
.howto summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:10px;padding:15px 18px;font-weight:600}
.howto summary::-webkit-details-marker{display:none}
.howto summary::after{content:"+";margin-left:auto;font:400 20px/1 var(--sans);color:var(--ink-3)}
.howto details[open] summary::after{content:"–"}
.howto summary svg{width:18px;height:18px;color:var(--ink-2)}
.howto .steps{padding:0 14px 14px}
.howto .steps li{background:var(--bg)}