/* MAX Tutor — site styles.
   Light edition of the MAX design language: the app's paper tone, two voices (ochre = MAX, celadon = student),
   Instrument Sans for speech, Geist Mono for every number and label. */
:root {
  --paper: #FFFFFF; --paper-2: #F6F6F4; --card: #FFFFFF; --hairline: #E7E7E4; --hairline-strong: #D3D3CF;
  --max: #8F5512; --max-soft: #C08A4A; --max-wash: #F4F4F2;
  --you: #2E6A5E; --you-wash: #EEF3F1;
  --ink: #0C0C0D; --ink-muted: #55575C; --ink-faint: #8B8D92;
  --sans: "Instrument Sans", ui-sans-serif, sans-serif;
  --mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --label: 176px;
}
* { box-sizing: border-box; }
html { background: var(--paper); scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 18px/1.6 var(--sans); -webkit-font-smoothing: antialiased; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 max(20px, env(safe-area-inset-left)); }
.mono, .label, .num { font-family: var(--mono); font-variant-numeric: tabular-nums; }
a { color: var(--ink); text-decoration-color: var(--hairline-strong); text-decoration-thickness: 1px; text-underline-offset: 4px; }
a:hover { text-decoration-color: var(--ink); }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }
[data-lang="de"] .en, [data-lang="en"] .de { display: none; }
::selection { background: #E6E6E3; }

.skip { position: absolute; left: -9999px; top: 8px; background: var(--ink); color: var(--paper); padding: 8px 12px; font-family: var(--mono); font-size: 13px; z-index: 40; }
.skip:focus { left: 16px; }

/* ── Header ───────────────────────────────────────────── */
.site-header { position: sticky; top: 0; z-index: 30; background: rgba(255, 255, 255, .96); border-bottom: 1px solid var(--hairline); }
.bar { display: flex; align-items: center; justify-content: space-between; gap: 20px; height: 68px; }
.mark { display: inline-flex; align-items: baseline; gap: 8px; font-weight: 600; font-size: 20px; letter-spacing: .01em; text-decoration: none; color: var(--ink); white-space: nowrap; }
.mark svg { width: 26px; height: 14px; align-self: center; }
.mark span { font-family: var(--mono); font-weight: 400; font-size: 11px; color: var(--ink-muted); letter-spacing: .12em; text-transform: uppercase; }
.nav { display: flex; align-items: center; gap: 4px; height: 100%; }
.nav > a, .dd-btn { display: inline-flex; align-items: center; gap: 6px; height: 40px; padding: 0 12px; border-radius: 4px; font: 500 15px var(--sans); color: var(--ink-muted); text-decoration: none; background: none; border: 0; cursor: pointer; transition: color 180ms var(--ease), background 180ms var(--ease); }
.nav > a:hover, .dd-btn:hover, .dd.open .dd-btn { color: var(--ink); background: var(--paper-2); }
.nav > a[aria-current="page"], .dd.current .dd-btn { color: var(--ink); }
.dd.current .dd-btn::before, .nav > a[aria-current="page"]::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--ink); margin-right: 2px; }
.dd-btn .chev { width: 9px; height: 9px; transition: transform 200ms var(--ease); }
.dd.open .dd-btn .chev { transform: rotate(180deg); }
.dd { position: relative; }
.dd-panel { position: absolute; top: calc(100% + 12px); left: -12px; width: 520px; background: var(--card); border: 1px solid var(--hairline); border-radius: 8px; box-shadow: 0 24px 48px -24px rgba(12, 12, 13, .22), 0 2px 6px rgba(12, 12, 13, .04); padding: 10px; display: grid; grid-template-columns: 1fr 1fr; gap: 2px; opacity: 0; visibility: hidden; transform: translateY(-4px); transition: opacity 180ms var(--ease), transform 180ms var(--ease), visibility 180ms; }
.dd.open .dd-panel { opacity: 1; visibility: visible; transform: none; }
.dd.right .dd-panel { left: auto; right: -12px; }
.dd-panel a { display: block; text-decoration: none; padding: 12px 14px; border-radius: 4px; }
.dd-panel a:hover, .dd-panel a:focus-visible { background: var(--paper-2); }
.dd-panel b { display: block; font-weight: 600; font-size: 15px; color: var(--ink); }
.dd-panel small { display: block; font-size: 13.5px; line-height: 1.4; color: var(--ink-muted); margin-top: 2px; }
.dd-panel .all { grid-column: 1 / -1; border-top: 1px solid var(--hairline); border-radius: 0 0 4px 4px; margin-top: 6px; padding-top: 12px; font-family: var(--mono); font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink); }
.tools { display: flex; align-items: center; gap: 16px; }
.lang { font-family: var(--mono); font-size: 12px; letter-spacing: .1em; color: var(--ink-faint); white-space: nowrap; }
.lang button { background: none; border: 0; color: inherit; font: inherit; letter-spacing: inherit; cursor: pointer; padding: 6px 2px; }
.lang button[aria-pressed="true"] { color: var(--ink); border-bottom: 1.5px solid var(--ink); }
.cta { display: inline-flex; align-items: center; gap: 8px; font: 500 14px var(--sans); text-decoration: none; color: var(--paper); background: var(--ink); padding: 10px 16px; border-radius: 4px; white-space: nowrap; transition: background 180ms var(--ease); }
.cta:hover { background: #2A2B2E; }
.cta.ochre { background: var(--ink); color: #FFFFFF; } .cta.ochre:hover { background: #2A2B2E; }
.menu-btn { display: none; align-items: center; gap: 10px; background: none; border: 1px solid var(--hairline-strong); color: var(--ink); font: 500 14px var(--sans); padding: 8px 12px; border-radius: 4px; cursor: pointer; }
.menu-btn i { position: relative; display: block; width: 16px; height: 10px; }
.menu-btn i::before, .menu-btn i::after { content: ""; position: absolute; left: 0; right: 0; height: 1.5px; background: currentColor; transition: transform 220ms var(--ease), top 220ms var(--ease); }
.menu-btn i::before { top: 1px; } .menu-btn i::after { top: 7px; }
.menu-btn[aria-expanded="true"] i::before { top: 4px; transform: rotate(45deg); }
.menu-btn[aria-expanded="true"] i::after { top: 4px; transform: rotate(-45deg); }
.drawer { display: none; }

/* ── Page structure ──────────────────────────────────── */
.page-head { padding: 92px 0 44px; }
.eyebrow { display: flex; align-items: center; gap: 10px; font-family: var(--mono); font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-muted); margin: 0 0 20px; }
.eyebrow::before { content: ""; width: 18px; height: 1px; background: var(--ink); }
.page-head h1 { font-weight: 500; font-size: clamp(38px, 6vw, 72px); line-height: 1.03; letter-spacing: -.028em; margin: 0; max-width: 16ch; }
.page-head .intro { font-size: 22px; line-height: 1.45; color: var(--ink-muted); max-width: 46ch; margin: 26px 0 0; }
h1 em, h2 em { font-style: normal; color: var(--max); }
h1 i, h2 i { font-style: normal; color: var(--you); }
.toc { display: flex; flex-wrap: wrap; gap: 8px 22px; padding: 18px 0 0; margin-top: 36px; border-top: 1px solid var(--hairline); }
.toc a { font-family: var(--mono); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-muted); text-decoration: none; }
.toc a:hover { color: var(--ink); }

section.block { display: grid; grid-template-columns: var(--label) 1fr; gap: 32px; padding: 76px 0; border-top: 1px solid var(--hairline); scroll-margin-top: 80px; }
.label { font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-muted); }
.label b { display: block; color: var(--ink-faint); font-weight: 400; margin-bottom: 6px; }
h2 { font-weight: 500; font-size: clamp(27px, 3.4vw, 42px); line-height: 1.1; letter-spacing: -.018em; margin: 0 0 20px; max-width: 24ch; }
h3 { font-size: 18px; font-weight: 600; margin: 0 0 6px; }
p { margin: 0 0 16px; max-width: 64ch; }
.quiet { color: var(--ink-muted); }
.small { font-size: 15px; }

/* ── Hero ────────────────────────────────────────────── */
.hero { display: grid; grid-template-columns: 1.15fr .85fr; gap: 56px; align-items: center; padding: 76px 0 40px; }
.hero h1 { font-weight: 500; font-size: clamp(38px, 5.6vw, 70px); line-height: 1.02; letter-spacing: -.028em; margin: 0; }
.hero .intro { font-size: 21px; line-height: 1.5; color: var(--ink-muted); margin: 26px 0 30px; max-width: 40ch; }
.hero .actions { display: flex; gap: 12px; flex-wrap: wrap; }
.ghost { display: inline-flex; align-items: center; font: 500 14px var(--sans); text-decoration: none; color: var(--ink); padding: 10px 16px; border-radius: 4px; border: 1px solid var(--hairline-strong); }
.ghost:hover { background: var(--paper-2); }

/* Trace */
.trace { margin: 0; padding: 22px 0 0; }
.trace svg { display: block; width: 100%; height: auto; overflow: visible; }
.trace .axis { stroke: var(--hairline); stroke-width: 1; }
.trace .m { fill: none; stroke: var(--max); stroke-width: 2; }
.trace .y { fill: none; stroke: var(--you); stroke-width: 2; }
.trace .draw { stroke-dasharray: 2600; stroke-dashoffset: 2600; animation: draw 1.2s var(--ease) .2s forwards; }
@keyframes draw { to { stroke-dashoffset: 0; } }
.legend { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px 16px; margin-top: 12px; font-family: var(--mono); font-size: 11.5px; letter-spacing: .06em; color: var(--ink-muted); text-transform: uppercase; }
.legend b { font-weight: 400; } .legend b:first-child { white-space: nowrap; }
.legend .km { color: var(--max); } .legend .ky { color: var(--you); }

/* ── Phone screens ───────────────────────────────────── */
.phone { position: relative; margin: 0 auto; width: 100%; max-width: 300px; aspect-ratio: 520 / 932; border-radius: 36px; background: #0C0C0D; padding: 9px; box-shadow: 0 40px 80px -40px rgba(12, 12, 13, .45), 0 0 0 1px rgba(12,12,13,.08); }
.phone img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: top; border-radius: 25px; background: var(--paper); }
.phone::before { content: ""; position: absolute; top: 17px; left: 50%; width: 64px; height: 6px; margin-left: -32px; border-radius: 6px; background: #0C0C0D; z-index: 2; }
.screens { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; align-items: start; }
.screens figure { margin: 0; }
.screens figcaption { margin-top: 18px; }
.screens figcaption b { display: block; font-size: 16px; font-weight: 600; }
.screens figcaption span.d { display: block; color: var(--ink-muted); font-size: 15px; line-height: 1.45; margin-top: 4px; }
.screens .phone { max-width: 260px; }
.note { font-family: var(--mono); font-size: 12px; letter-spacing: .03em; color: var(--ink-faint); margin-top: 22px; max-width: none; }

/* ── Rows, figures, tables ───────────────────────────── */
.rows { border-top: 1px solid var(--hairline); }
.row { display: grid; grid-template-columns: 240px 1fr; gap: 24px; padding: 20px 0; border-bottom: 1px solid var(--hairline); }
.row p { margin: 0; color: var(--ink-muted); font-size: 16px; }
.row .meta { font-family: var(--mono); font-size: 12px; letter-spacing: .06em; color: var(--ink-faint); text-transform: uppercase; display: block; margin-top: 4px; }

.figures { display: grid; grid-template-columns: repeat(5, 1fr); border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); }
.figures.four { grid-template-columns: repeat(4, 1fr); }
.fig { padding: 24px 18px 22px 0; }
.fig + .fig { padding-left: 18px; border-left: 1px solid var(--hairline); }
.fig .num { display: block; font-size: clamp(27px, 3.2vw, 40px); letter-spacing: -.02em; color: var(--ink); font-weight: 500; }
.fig > span { font-family: var(--mono); font-size: 11.5px; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-muted); }

table.data { width: 100%; border-collapse: collapse; font-size: 16px; }
table.data th { text-align: left; font-family: var(--mono); font-weight: 400; font-size: 11.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-faint); padding: 10px 12px 10px 0; border-bottom: 1px solid var(--hairline-strong); }
table.data td { padding: 15px 12px 15px 0; border-bottom: 1px solid var(--hairline); vertical-align: top; color: var(--ink-muted); }
table.data td:first-child { color: var(--ink); font-weight: 600; }
table.data td.num { color: var(--ink); text-align: right; white-space: nowrap; }
table.data th.r { text-align: right; }

.steps { counter-reset: step; border-top: 1px solid var(--hairline); }
.step { display: grid; grid-template-columns: 56px 1fr; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--hairline); }
.step::before { counter-increment: step; content: counter(step, decimal-leading-zero); font-family: var(--mono); font-size: 13px; color: var(--ink-faint); padding-top: 3px; }
.step p { margin: 4px 0 0; color: var(--ink-muted); font-size: 16px; }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.split p { color: var(--ink-muted); font-size: 16px; }
.price { font-family: var(--mono); color: var(--ink); font-size: 15px; }
.tag { font-family: var(--mono); font-size: 10.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-muted); background: var(--paper-2); border: 1px solid var(--hairline); padding: 3px 7px; border-radius: 3px; margin-left: 8px; vertical-align: 2px; white-space: nowrap; }

/* Dialog + grade */
.dialog { background: var(--paper-2); border: 1px solid var(--hairline); border-radius: 8px; padding: 4px 24px; }
.turn { display: grid; grid-template-columns: 96px 1fr; gap: 20px; padding: 16px 0; border-bottom: 1px solid var(--hairline); }
.turn:last-child { border-bottom: 0; }
.turn .who { font-family: var(--mono); font-size: 11.5px; letter-spacing: .08em; text-transform: uppercase; padding-top: 4px; }
.turn.m .who { color: var(--max); } .turn.y .who { color: var(--you); }
.turn p { margin: 0; font-size: 17px; } .turn.y p { color: var(--ink-muted); }
.grade { display: grid; grid-template-columns: repeat(5, 1fr); margin-top: 24px; border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); }
.grade div { padding: 16px 0; } .grade div + div { padding-left: 16px; border-left: 1px solid var(--hairline); }
.grade .num { display: block; font-size: 30px; color: var(--ink); font-weight: 500; } .grade .num.big { color: var(--ink); font-weight: 600; }
.grade span { font-family: var(--mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-muted); }
.src { font-family: var(--mono); font-size: 12px; letter-spacing: .03em; color: var(--ink-faint); margin-top: 14px; max-width: none; }

/* Architecture */
.arch svg { display: block; width: 100%; height: auto; }
.arch text { font-family: var(--mono); font-size: 13px; letter-spacing: .04em; fill: var(--ink-muted); }
.arch .t { fill: var(--ink); font-family: var(--sans); font-size: 16px; font-weight: 600; letter-spacing: 0; }
.arch .box { fill: var(--card); stroke: var(--hairline-strong); }
.arch .core { fill: var(--paper-2); stroke: var(--ink); }
.arch .ln { stroke: var(--ink-faint); stroke-width: 1.2; fill: none; }
.arch .lm { stroke: var(--max); stroke-width: 1.8; fill: none; }
.arch .ly { stroke: var(--you); stroke-width: 1.8; fill: none; }
.arch-list { display: none; margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--hairline); }
.arch-list li { padding: 12px 0; border-bottom: 1px solid var(--hairline); color: var(--ink-muted); font-size: 16px; }
.arch-list b { color: var(--ink); font-weight: 600; }

/* FAQ */
.faq { border-top: 1px solid var(--hairline); }
.faq details { border-bottom: 1px solid var(--hairline); padding: 18px 0; }
.faq summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-family: var(--mono); font-size: 18px; line-height: 1; color: var(--ink-muted); }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: 10px 0 0; color: var(--ink-muted); font-size: 16px; }

/* Teasers */
.teasers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.teaser { display: flex; flex-direction: column; text-decoration: none; padding: 28px 26px; background: var(--card); border: 1px solid var(--hairline); border-radius: 8px; transition: border-color 180ms var(--ease), transform 180ms var(--ease); }
.teaser:hover { border-color: var(--ink); transform: translateY(-2px); }
.teaser h3 { font-size: 21px; font-weight: 500; }
.teaser p { color: var(--ink-muted); font-size: 16px; margin: 0 0 18px; flex: 1; }
.teaser .go { font-family: var(--mono); font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink); }

/* Callout */
.callout { display: flex; justify-content: space-between; align-items: center; gap: 24px; flex-wrap: wrap; margin: 24px 0 88px; padding: 48px 44px; background: var(--ink); color: #FFFFFF; border-radius: 10px; }
.callout h2 { margin: 0; color: #FFFFFF; }
.callout .mail { color: #FFFFFF; font-size: clamp(22px, 2.8vw, 32px); font-weight: 500; text-decoration-color: rgba(255,255,255,.35); }
.callout .mail:hover { text-decoration-color: #FFFFFF; }
.mail { font-size: clamp(22px, 2.8vw, 34px); font-weight: 500; color: var(--ink); }

/* ── Footer ──────────────────────────────────────────── */
.site-footer { border-top: 1px solid var(--hairline); background: var(--paper-2); padding: 56px 0 calc(40px + env(safe-area-inset-bottom)); }
.foot { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 28px; }
.foot h4 { font-family: var(--mono); font-weight: 400; font-size: 11.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-faint); margin: 0 0 14px; }
.foot ul { list-style: none; margin: 0; padding: 0; }
.foot li { margin-bottom: 9px; }
.foot a { color: var(--ink-muted); text-decoration: none; font-size: 15px; }
.foot a:hover { color: var(--ink); }
.foot p { color: var(--ink-muted); font-size: 15px; }
.legal { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--hairline-strong); font-family: var(--mono); font-size: 11.5px; letter-spacing: .05em; color: var(--ink-faint); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
.legal a { color: var(--ink-muted); }

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 1020px) {
  .nav, .tools .cta { display: none; }
  .menu-btn { display: inline-flex; }
  .drawer { display: block; overflow: hidden; max-height: 0; transition: max-height 320ms var(--ease); }
  .drawer.open { max-height: 1400px; border-top: 1px solid var(--hairline); }
  .drawer-inner { padding: 6px 0 26px; }
  .acc { border-bottom: 1px solid var(--hairline); }
  .acc > a, .acc-btn { display: flex; width: 100%; justify-content: space-between; align-items: center; padding: 16px 0; font: 500 21px var(--sans); color: var(--ink); text-decoration: none; background: none; border: 0; cursor: pointer; text-align: left; }
  .acc-btn .chev { width: 12px; height: 12px; transition: transform 220ms var(--ease); }
  .acc.open .acc-btn .chev { transform: rotate(180deg); }
  .acc-panel { display: none; padding: 0 0 14px; }
  .acc.open .acc-panel { display: block; }
  .acc-panel a { display: block; padding: 9px 0 9px 14px; border-left: 1.5px solid var(--hairline-strong); text-decoration: none; color: var(--ink-muted); font-size: 16px; }
  .acc-panel a:hover { color: var(--ink); border-left-color: var(--ink); }
  .drawer .cta { margin-top: 22px; }
  .hero { grid-template-columns: 1fr; gap: 36px; padding-top: 52px; }
}
@media (max-width: 860px) {
  :root { --label: 1fr; }
  section.block { grid-template-columns: 1fr; gap: 14px; padding: 56px 0; }
  .row, .turn { grid-template-columns: 1fr; gap: 6px; }
  .figures, .figures.four { grid-template-columns: repeat(2, 1fr); }
  .fig, .fig + .fig { padding: 18px 0; border-left: 0; }
  .fig:nth-child(even) { padding-left: 16px; border-left: 1px solid var(--hairline); }
  .split, .teasers, .screens { grid-template-columns: 1fr; }
  .screens { gap: 44px; }
  .grade { grid-template-columns: repeat(3, 1fr); }
  .grade div:nth-child(4) { padding-left: 0; border-left: 0; }
  .arch svg { display: none; } .arch-list { display: block; }
  .foot { grid-template-columns: 1fr 1fr; }
  .page-head { padding-top: 56px; }
  .page-head h1, h2 { hyphens: auto; -webkit-hyphens: auto; overflow-wrap: anywhere; }
  .callout { padding: 32px 24px; }
  table.data { font-size: 15px; }
  table.data .hide-s { display: none; }
  .dialog { padding: 4px 16px; }
}
@media (prefers-reduced-motion: reduce) {
  .trace .draw { animation: none; stroke-dashoffset: 0; }
  .drawer, .dd-panel, .teaser { transition: none; }
  html { scroll-behavior: auto; }
}