/* =====================================================================
   Dr. Lea Schulz — Academic Identity System
   Shared tokens, typography, layout & components
   Palette: deep navy · petrol/turquoise · warm gold · warm white/grey
   Type:    Bodoni Moda (display) · Newsreader (editorial) · Hanken Grotesk (UI/body)
   ===================================================================== */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}
body { line-height: 1.6; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
img, picture, svg { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }
ul[role="list"] { list-style: none; padding: 0; }

/* ---------- Tokens ---------- */
:root {
  /* Brand */
  --navy:        #0E2238;   /* primary ink / dark sections */
  --navy-700:    #15314f;
  --navy-600:    #1d3f63;
  --petrol:      #0F5C66;   /* secondary */
  --petrol-600:  #137685;
  --teal:        #2E9AA6;   /* turquoise */
  --teal-300:    #6FC4C6;
  --gold:        #B98A33;   /* warm gold accent */
  --gold-soft:   #D8B777;
  --gold-tint:   #F3E9D4;

  /* Neutrals (warm) */
  --paper:       #FBFAF6;   /* warm white background */
  --paper-2:     #F4F1E9;   /* light warm grey panel */
  --paper-3:     #ECE7DB;
  --line:        #E2DCCD;   /* hairlines */
  --line-strong: #C9C2AF;
  --ink:         #14202E;   /* body text */
  --ink-soft:    #4B5663;   /* secondary text */
  --ink-faint:   #7A8492;

  /* On-dark */
  --on-dark:        #F4F1E9;
  --on-dark-soft:   #B7C2CE;
  --on-dark-faint:  #7E8C9C;

  /* Type families — single-family system: Hanken Grotesk everywhere */
  --display: "Hanken Grotesk", system-ui, -apple-system, sans-serif;
  --serif:   "Hanken Grotesk", system-ui, -apple-system, sans-serif;
  --sans:    "Hanken Grotesk", system-ui, -apple-system, sans-serif;

  /* Fluid type scale */
  --fs-eyebrow: clamp(.72rem, .68rem + .15vw, .82rem);
  --fs-body:    clamp(1rem, .97rem + .2vw, 1.12rem);
  --fs-lede:    clamp(1.18rem, 1.05rem + .55vw, 1.5rem);
  --fs-h3:      clamp(1.25rem, 1.1rem + .7vw, 1.7rem);
  --fs-h2:      clamp(1.9rem, 1.4rem + 2vw, 3.1rem);
  --fs-h1:      clamp(2.6rem, 1.6rem + 4.4vw, 5.4rem);
  --fs-mega:    clamp(3.2rem, 1.4rem + 7vw, 8rem);

  /* Spacing & rhythm */
  --container: 1240px;
  --container-wide: 1440px;
  --container-narrow: 880px;
  --gutter: clamp(1.25rem, 1rem + 3vw, 4rem);
  --section-y: clamp(4rem, 3rem + 6vw, 9rem);

  --radius: 4px;
  --radius-lg: 10px;
  --shadow-sm: 0 1px 2px rgba(14,34,56,.05), 0 2px 8px rgba(14,34,56,.04);
  --shadow-md: 0 6px 20px rgba(14,34,56,.08), 0 2px 6px rgba(14,34,56,.05);
  --shadow-lg: 0 24px 60px rgba(14,34,56,.14), 0 6px 16px rgba(14,34,56,.07);

  --ease: cubic-bezier(.22,.61,.36,1);
  --dur: .55s;
}

/* ---------- Base ---------- */
body {
  font-family: var(--sans);
  font-size: var(--fs-body);
  color: var(--ink);
  background: var(--paper);
  font-weight: 400;
  letter-spacing: .002em;
}

::selection { background: var(--gold-soft); color: var(--navy); }

:focus-visible {
  outline: 2.5px solid var(--petrol-600);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute; left: 1rem; top: -120px;
  background: var(--navy); color: var(--on-dark);
  padding: .7rem 1.1rem; border-radius: var(--radius);
  z-index: 200; transition: top .2s var(--ease);
  font: 600 .9rem/1 var(--sans); letter-spacing: .02em;
}
.skip-link:focus { top: 1rem; }

/* ---------- Layout ---------- */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
.container.wide { max-width: var(--container-wide); }
.container.narrow { max-width: var(--container-narrow); }
.section { padding-block: var(--section-y); }
.section.tight { padding-block: clamp(2.5rem, 2rem + 3vw, 5rem); }

.divider { height: 1px; background: var(--line); border: 0; }
.divider.strong { background: var(--line-strong); }

/* ---------- Typography ---------- */
.eyebrow {
  font-family: var(--sans);
  font-size: var(--fs-eyebrow);
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink-faint);
  display: inline-flex; align-items: center; gap: .7em;
}
.eyebrow::before {
  content: ""; width: 1.8em; height: 1px; background: currentColor; opacity: .6;
}
.eyebrow.no-rule::before { display: none; }
.eyebrow.gold { color: var(--gold); }
.eyebrow.on-dark { color: var(--teal-300); }

.display {
  font-family: var(--display);
  font-weight: 600;
  line-height: .98;
  letter-spacing: -.022em;
  color: var(--navy);
}
h1, .h1 { font-family: var(--display); font-weight: 600; font-size: var(--fs-h1); line-height: 1.02; letter-spacing: -.025em; color: var(--navy); }
h2, .h2 { font-family: var(--display); font-weight: 600; font-size: var(--fs-h2); line-height: 1.06; letter-spacing: -.02em; color: var(--navy); }
h3, .h3 { font-family: var(--display); font-weight: 600; font-size: var(--fs-h3); line-height: 1.18; letter-spacing: -.012em; color: var(--navy); }
.mega   { font-family: var(--display); font-weight: 700; font-size: var(--fs-mega); line-height: .94; letter-spacing: -.03em; color: var(--navy); }

.lede {
  font-family: var(--serif);
  font-size: var(--fs-lede);
  line-height: 1.5;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -.005em;
}
.lede em, .serif-em { font-style: italic; }
.serif { font-family: var(--serif); }

p { text-wrap: pretty; }
.muted { color: var(--ink-soft); }
.faint { color: var(--ink-faint); }
.measure { max-width: 64ch; }
.measure-sm { max-width: 46ch; }

.caption {
  font-size: .82rem; letter-spacing: .04em; color: var(--ink-faint);
  font-weight: 500;
}
.tnum { font-variant-numeric: tabular-nums; }

/* ---------- Buttons ---------- */
.btn {
  --btn-bg: var(--navy); --btn-fg: var(--on-dark); --btn-bd: var(--navy);
  display: inline-flex; align-items: center; gap: .6em;
  font-family: var(--sans); font-weight: 600; font-size: .94rem; letter-spacing: .01em;
  padding: .85em 1.5em; border: 1px solid var(--btn-bd); background: var(--btn-bg); color: var(--btn-fg);
  border-radius: 999px; cursor: pointer; text-decoration: none;
  transition: transform .25s var(--ease), background .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease);
  will-change: transform;
}
.btn .arw { transition: transform .3s var(--ease); }
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn:hover .arw { transform: translateX(4px); }
.btn:active { transform: translateY(0); }

.btn--ghost { --btn-bg: transparent; --btn-fg: var(--navy); --btn-bd: var(--line-strong); }
.btn--ghost:hover { --btn-bd: var(--navy); background: var(--navy); color: var(--on-dark); }
.btn--gold { --btn-bg: var(--gold); --btn-bd: var(--gold); --btn-fg: #2a1e07; }
.btn--on-dark { --btn-bg: var(--on-dark); --btn-fg: var(--navy); --btn-bd: var(--on-dark); }
.btn--on-dark-ghost { --btn-bg: transparent; --btn-fg: var(--on-dark); --btn-bd: rgba(244,241,233,.35); }
.btn--on-dark-ghost:hover { --btn-bd: var(--on-dark); background: var(--on-dark); color: var(--navy); }
.btn--sm { padding: .6em 1.1em; font-size: .85rem; }

/* Text link with animated underline */
.link {
  display: inline-flex; align-items: center; gap: .45em;
  font-weight: 600; text-decoration: none; color: var(--navy);
  background-image: linear-gradient(var(--gold), var(--gold));
  background-size: 0% 1.5px; background-position: 0 100%; background-repeat: no-repeat;
  transition: background-size .35s var(--ease), color .25s var(--ease);
  padding-bottom: 2px;
}
.link:hover { background-size: 100% 1.5px; }
.link .arw { transition: transform .3s var(--ease); }
.link:hover .arw { transform: translateX(3px); }
.link.on-dark { color: var(--on-dark); }

/* ---------- Tags / pills ---------- */
.tag {
  display: inline-flex; align-items: center; gap: .4em;
  font-family: var(--sans); font-size: .76rem; font-weight: 600; letter-spacing: .04em;
  padding: .4em .8em; border-radius: 999px; border: 1px solid var(--line-strong);
  color: var(--ink-soft); background: transparent; white-space: nowrap;
}
.tag.solid { background: var(--paper-2); border-color: var(--paper-2); }
.tag.teal { color: var(--ink-soft); border-color: var(--line-strong); background: transparent; }
.tag.gold { color: var(--ink-soft); border-color: var(--line-strong); background: transparent; }

/* ---------- Header / nav ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  transition: background .4s var(--ease), box-shadow .4s var(--ease), border-color .4s var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom-color: var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between; gap: 1.5rem;
  height: 78px;
}
.brand { display: inline-flex; align-items: center; gap: .7rem; text-decoration: none; color: var(--navy); }
.brand .mark { flex: 0 0 auto; }
.brand .brand-name { font-family: var(--display); font-weight: 700; font-size: 1.18rem; letter-spacing: -.01em; line-height: 1.05; white-space: nowrap; }
.brand .brand-sub { font-family: var(--sans); font-size: .62rem; letter-spacing: .26em; text-transform: uppercase; color: var(--petrol-600); font-weight: 600; margin-top: 3px; }
.brand-text { display: flex; flex-direction: column; }

.nav-links { display: flex; align-items: center; gap: clamp(.5rem, .2rem + 1vw, 1.6rem); }
.nav-links a {
  position: relative; text-decoration: none; color: var(--ink); font-weight: 500;
  font-size: .92rem; letter-spacing: .005em; padding: .4em 0;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 1.5px;
  background: var(--gold); transform: scaleX(0); transform-origin: left; transition: transform .3s var(--ease);
}
.nav-links a:hover::after, .nav-links a[aria-current="page"]::after { transform: scaleX(1); }
.nav-links a[aria-current="page"] { color: var(--navy); }

.nav-tools { display: flex; align-items: center; gap: .8rem; }

.lang-toggle {
  display: inline-flex; align-items: center; border: 1px solid var(--line-strong);
  border-radius: 999px; overflow: hidden; background: transparent;
}
.lang-toggle button {
  border: 0; background: transparent; cursor: pointer; padding: .35em .7em;
  font-size: .78rem; font-weight: 700; letter-spacing: .06em; color: var(--ink-faint);
  transition: background .2s var(--ease), color .2s var(--ease);
}
.lang-toggle button[aria-pressed="true"] { background: var(--navy); color: var(--on-dark); }

.menu-btn {
  display: none; align-items: center; justify-content: center; gap: 5px; flex-direction: column;
  width: 44px; height: 44px; border: 1px solid var(--line-strong); border-radius: 999px;
  background: transparent; cursor: pointer;
}
.menu-btn span { display: block; width: 18px; height: 1.5px; background: var(--navy); transition: transform .3s var(--ease), opacity .3s var(--ease); }
.menu-btn[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.menu-btn[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-btn[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Dark header variant (over dark hero) */
.site-header.on-dark:not(.scrolled) .brand { color: var(--on-dark); }
.site-header.on-dark:not(.scrolled) .brand .brand-sub { color: var(--teal-300); }
.site-header.on-dark:not(.scrolled) .nav-links a { color: var(--on-dark); }
.site-header.on-dark:not(.scrolled) .lang-toggle { border-color: rgba(244,241,233,.3); }
.site-header.on-dark:not(.scrolled) .lang-toggle button { color: var(--on-dark-soft); }
.site-header.on-dark:not(.scrolled) .lang-toggle button[aria-pressed="true"] { background: var(--on-dark); color: var(--navy); }
.site-header.on-dark:not(.scrolled) .menu-btn { border-color: rgba(244,241,233,.3); }
.site-header.on-dark:not(.scrolled) .menu-btn span { background: var(--on-dark); }

/* Mobile drawer */
.mobile-menu {
  position: fixed; inset: 0; z-index: 99; background: var(--paper);
  display: flex; flex-direction: column; padding: 96px var(--gutter) 2rem;
  transform: translateY(-100%); opacity: 0; visibility: hidden;
  transition: transform .5s var(--ease), opacity .4s var(--ease), visibility .4s;
  overflow-y: auto;
}
.mobile-menu.open { transform: translateY(0); opacity: 1; visibility: visible; }
.mobile-menu a {
  font-family: var(--display); font-size: clamp(1.6rem, 1.2rem + 3vw, 2.4rem); color: var(--navy);
  text-decoration: none; padding: .35em 0; border-bottom: 1px solid var(--line);
  display: flex; align-items: baseline; justify-content: space-between;
  opacity: 0; transform: translateY(12px);
}
.mobile-menu.open a { animation: drawerIn .5s var(--ease) forwards; }
.mobile-menu a .idx { font-family: var(--sans); font-size: .8rem; color: var(--ink-faint); letter-spacing: .1em; }
@keyframes drawerIn { to { opacity: 1; transform: translateY(0); } }
.mobile-foot { margin-top: auto; padding-top: 2rem; display: flex; gap: 1.2rem; flex-wrap: wrap; }
.mobile-foot a { font-family: var(--sans); font-size: .8rem; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-soft); border: 0; padding: 0; }

/* ---------- Cards ---------- */
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  transition: transform .4s var(--ease), box-shadow .4s var(--ease), border-color .4s var(--ease);
}
.card.hover:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }

/* ---------- Footer ---------- */
.site-footer { background: var(--navy); color: var(--on-dark); margin-top: clamp(4.5rem, 3rem + 5vw, 8rem); padding-block: clamp(4.5rem, 3.2rem + 5vw, 7.5rem) 3rem; }
.site-footer a { color: var(--on-dark-soft); text-decoration: none; transition: color .2s var(--ease); }
.site-footer a:hover { color: var(--on-dark); }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: clamp(2rem, 1rem + 3vw, 4rem); }
.footer-col h4 { font-family: var(--sans); font-size: .74rem; letter-spacing: .18em; text-transform: uppercase; color: var(--teal-300); font-weight: 600; margin-bottom: 1.1rem; }
.footer-col ul { list-style: none; padding: 0; display: flex; flex-direction: column; gap: .65rem; }
.footer-col li a { font-size: .95rem; }
.footer-brand .brand-name { font-family: var(--display); font-size: 1.5rem; color: var(--on-dark); }
.footer-brand p { color: var(--on-dark-soft); margin-top: 1rem; font-size: .95rem; max-width: 34ch; }
.footer-soc { display: flex; gap: .6rem; margin-top: 1.5rem; }
.footer-soc a { width: 42px; height: 42px; border: 1px solid rgba(244,241,233,.2); border-radius: 999px; display: grid; place-items: center; transition: background .25s var(--ease), border-color .25s var(--ease); }
.footer-soc a:hover { background: rgba(244,241,233,.1); border-color: rgba(244,241,233,.45); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; margin-top: clamp(2.5rem, 2rem + 2vw, 4rem); padding-top: 1.6rem; border-top: 1px solid rgba(244,241,233,.14); font-size: .82rem; color: var(--on-dark-faint); }
.footer-bottom a { color: var(--on-dark-faint); }
.footer-bottom .legal { display: flex; gap: 1.4rem; flex-wrap: wrap; }

/* ---------- Scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .08s; }
.reveal.d2 { transition-delay: .16s; }
.reveal.d3 { transition-delay: .24s; }
.reveal.d4 { transition-delay: .32s; }
.reveal.d5 { transition-delay: .40s; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; } }

/* Auto scroll-reveal (site-wide, JS-tagged) */
.areveal { opacity: 0; transform: translateY(22px); transition: opacity .7s cubic-bezier(.22,.61,.36,1), transform .7s cubic-bezier(.22,.61,.36,1); will-change: opacity, transform; }
.areveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .areveal { opacity: 1 !important; transform: none !important; } }

/* ---------- i18n helper ---------- */
[data-de] { display: none; }
html[lang="de"] [data-en] { display: none; }
html[lang="de"] [data-de] { display: inline; }
html[lang="de"] [data-de].block { display: block; }

/* ---------- Portrait treatment ---------- */
.portrait-frame { position: relative; overflow: hidden; background: var(--paper-2); }
.portrait-frame img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 22%; }
.portrait-frame.duo img { filter: grayscale(.18) contrast(1.02); }

/* ---------- Image placeholder slot (user supplies image) ---------- */
.slot {
  position: relative; display: flex; align-items: center; justify-content: center; overflow: hidden;
  background-color: var(--paper-2);
  background-image: radial-gradient(circle at center, color-mix(in srgb, var(--ink-faint) 22%, transparent) .9px, transparent 1.1px);
  background-size: 16px 16px;
  color: var(--ink-faint);
}
.slot::after {
  content: attr(data-label); font-family: var(--sans); font-size: .66rem; letter-spacing: .16em; text-transform: uppercase; font-weight: 700; opacity: .72;
  background: var(--paper-2); padding: .5em .95em; border-radius: 999px; box-shadow: 0 0 0 1px color-mix(in srgb, var(--ink-faint) 20%, transparent);
}
.slot[data-tone="dark"] {
  background-color: var(--navy-700); color: var(--on-dark-soft);
  background-image: radial-gradient(circle at center, rgba(244,241,233,.13) .9px, transparent 1.1px);
}
.slot[data-tone="dark"]::after { background: var(--navy-700); box-shadow: 0 0 0 1px rgba(244,241,233,.18); }
.slot.fill { width: 100%; height: 100%; }

/* ---------- Generic grids ---------- */
.grid { display: grid; gap: clamp(1.2rem, .8rem + 1.5vw, 2rem); }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- Responsive ---------- */
@media (max-width: 1000px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2.5rem; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 860px) {
  .nav-links { display: none; }
  .menu-btn { display: flex; }
  .nav-tools .lang-toggle { display: none; }
  .cols-2, .cols-3, .cols-4 { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}