/* ─── Reset & Base ────────────────────────────────────────────────────────── */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --accent:        #4a7c59;
  --accent-light:  #6a9e77;
  --accent-dark:   #355a40;
  --accent-bg:     #f0f5f1;

  --bg:            #fafafa;
  --bg-tint:       #f3f4f2;
  --surface:       #ffffff;

  --text:          #1a1a18;
  --text-muted:    #6b6b68;
  --text-subtle:   #9b9b98;

  --border:        #e4e4e0;

  --font:          'Inter', system-ui, -apple-system, sans-serif;

  --radius-sm:     6px;
  --radius:        12px;
  --radius-lg:     20px;

  --shadow-sm:     0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow:        0 4px 16px rgba(0,0,0,.07), 0 1px 4px rgba(0,0,0,.04);

  --nav-h:         64px;
  --container:     1100px;
  --section-gap:   96px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 24px);
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dark); }
ul { list-style: none; }

/* ─── Utilities ───────────────────────────────────────────────────────────── */

.container {
  width: min(var(--container), 100% - 3rem);
  margin-inline: auto;
}

/* ─── Navigation ──────────────────────────────────────────────────────────── */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(250,250,250,.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  width: min(var(--container), 100% - 3rem);
  margin-inline: auto;
}

.nav__logo {
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--text);
}

.nav__logo:hover { color: var(--accent); }

.nav__links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav__links a {
  font-size: .9rem;
  font-weight: 400;
  color: var(--text-muted);
  transition: color .2s;
}

.nav__links a:hover { color: var(--text); }

.nav__cta {
  background: var(--accent);
  color: #fff !important;
  padding: .45rem 1.1rem;
  border-radius: var(--radius-sm);
  font-weight: 500 !important;
  transition: background .2s, transform .15s !important;
}

.nav__cta:hover {
  background: var(--accent-dark) !important;
  transform: translateY(-1px);
}

.nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav__burger span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .25s, opacity .25s;
}

/* burger open state */
.nav__burger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__burger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav__burger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ─── Buttons ─────────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .75rem 1.6rem;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: .95rem;
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s, transform .15s, box-shadow .2s;
  white-space: nowrap;
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  border: 2px solid var(--accent);
}

.btn--primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(74,124,89,.25);
}

.btn--ghost {
  background: transparent;
  color: var(--text);
  border: 2px solid var(--border);
}

.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* ─── Sections ────────────────────────────────────────────────────────────── */

.section {
  padding-block: var(--section-gap);
}

.section--tinted {
  background: var(--bg-tint);
}

.section__title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  letter-spacing: -.03em;
  color: var(--text);
  margin-bottom: 2.5rem;
}

.section__title::after {
  content: '';
  display: block;
  width: 2.5rem;
  height: 3px;
  background: var(--accent);
  margin-top: .6rem;
  border-radius: 2px;
}

/* ─── Hero ────────────────────────────────────────────────────────────────── */

.hero {
  padding-block: clamp(72px, 12vw, 140px);
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 4rem;
}

.hero__eyebrow {
  display: inline-block;
  font-size: .8rem;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero__name {
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 600;
  letter-spacing: -.04em;
  line-height: 1.05;
  color: var(--text);
  margin-bottom: 1.25rem;
}

.hero__tagline {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-muted);
  max-width: 38ch;
  margin-bottom: 2.5rem;
  line-height: 1.5;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Avatar */
.avatar {
  position: relative;
  width: clamp(160px, 22vw, 240px);
  aspect-ratio: 1;
  border-radius: 50%;
  overflow: hidden;
  background: var(--accent-bg);
  border: 3px solid var(--border);
  flex-shrink: 0;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  border-radius: 50%;
}

.avatar__initials {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: -.02em;
}

/* show initials when image fails */
.avatar--fallback img { display: none; }
.avatar--fallback .avatar__initials { display: flex; }

/* ─── About ───────────────────────────────────────────────────────────────── */

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about__text p {
  color: var(--text-muted);
  margin-bottom: 1.1rem;
  font-size: 1.05rem;
  line-height: 1.75;
}

.about__text p:last-child { margin-bottom: 0; }

.about__text strong { color: var(--text); font-weight: 500; }

.about__facts {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.fact {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.fact__icon {
  font-size: 1.25rem;
  flex-shrink: 0;
  color: var(--accent);
  font-variation-settings: 'opsz' 20, 'wght' 300, 'FILL' 0, 'GRAD' 0;
  user-select: none;
}

.fact div {
  display: flex;
  flex-direction: column;
  gap: .15rem;
}

.fact strong {
  font-size: .8rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--text-subtle);
  font-weight: 500;
}

.fact span,
.fact a {
  font-size: .95rem;
  color: var(--text-muted);
}

/* ─── Principles (Ansatz) ─────────────────────────────────────────────────── */

.principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.principle {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .2s, transform .2s;
}

.principle:hover {
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.principle__icon {
  display: inline-block;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--accent);
  background: var(--accent-bg);
  padding: .3rem .65rem;
  border-radius: 100px;
  margin-bottom: 1.1rem;
}

.principle__title {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -.02em;
  color: var(--text);
  margin-bottom: .75rem;
}

.principle__desc {
  font-size: .9rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ─── Cards (Werte) ───────────────────────────────────────────────────────── */

.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .2s, transform .2s;
}

.card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.card__title {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -.02em;
  margin-bottom: .9rem;
  color: var(--text);
  padding-bottom: .75rem;
  border-bottom: 2px solid var(--accent-bg);
}

.card__desc {
  font-size: .9rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ─── Projects ────────────────────────────────────────────────────────────── */

.projects {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.project {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .2s, transform .2s, border-color .2s;
}

.project:hover {
  box-shadow: var(--shadow);
  transform: translateY(-3px);
  border-color: var(--accent);
}

.project__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.project__name {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -.02em;
  color: var(--text);
}

.project__link {
  font-size: .85rem;
  font-weight: 500;
  color: var(--accent);
  white-space: nowrap;
  transition: color .2s;
}

.project__link:hover { color: var(--accent-dark); }

.project__desc {
  font-size: .95rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1.25rem;
}

.project__tags {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 0;
}

.project--concept .project__tags {
  margin-bottom: 1.25rem;
}

.project__badge {
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: #b45309;
  background: #fef3c7;
  border: 1px solid #fde68a;
  padding: .25rem .65rem;
  border-radius: 100px;
}

.tag {
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--accent-dark);
  background: var(--accent-bg);
  padding: .3rem .75rem;
  border-radius: 100px;
}

.btn--interest {
  width: 100%;
  justify-content: center;
  background: transparent;
  color: var(--accent);
  border: 2px dashed var(--accent);
  font-size: .9rem;
}

.btn--interest:hover {
  background: var(--accent-bg);
  border-style: solid;
  color: var(--accent-dark);
  transform: translateY(-1px);
}

.btn--interest:disabled {
  background: var(--accent-bg);
  border-style: solid;
  border-color: var(--accent);
  color: var(--accent-dark);
  cursor: default;
  transform: none;
  opacity: .8;
}

/* ─── Modal ───────────────────────────────────────────────────────────────── */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  animation: fadeIn .2s ease;
}

.modal-overlay[hidden] { display: none; }

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.modal {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  width: 100%;
  max-width: 440px;
  position: relative;
  box-shadow: 0 24px 64px rgba(0,0,0,.15);
  animation: slideUp .25s ease;
}

@keyframes slideUp {
  from { transform: translateY(16px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

.modal__close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  width: 32px;
  height: 32px;
  background: var(--bg-tint);
  border: none;
  border-radius: 50%;
  font-size: 1.2rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .2s, color .2s;
}

.modal__close:hover {
  background: var(--border);
  color: var(--text);
}

.modal__title {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -.02em;
  color: var(--text);
  margin-bottom: .6rem;
}

.modal__lead {
  font-size: .95rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.75rem;
}

.modal__form {
  display: flex;
  flex-direction: column;
  gap: .6rem;
}

.modal__label {
  font-size: .8rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: .02em;
}

.modal__optional { font-weight: 400; color: var(--text-subtle); }
.modal__required { color: var(--accent); }

.modal__input {
  width: 100%;
  padding: .7rem 1rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: .95rem;
  color: var(--text);
  background: var(--bg);
  transition: border-color .2s, box-shadow .2s;
  margin-bottom: .5rem;
}

.modal__input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(74,124,89,.12);
}

.modal__input.is-invalid {
  border-color: #dc2626;
}

.modal__error {
  font-size: .82rem;
  color: #dc2626;
  margin-top: -.3rem;
  margin-bottom: .25rem;
}

.modal__error[hidden] { display: none; }

.modal__submit { margin-top: .5rem; }

.modal__success {
  text-align: center;
  padding: 1rem 0;
}

.modal__success[hidden] { display: none; }

.modal__checkmark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: var(--accent-bg);
  color: var(--accent);
  border-radius: 50%;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

/* ─── Kontakt ─────────────────────────────────────────────────────────────── */

.kontakt__lead {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  max-width: 48ch;
}

.kontakt__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* ─── Footer ──────────────────────────────────────────────────────────────── */

.footer {
  padding-block: 2rem;
  border-top: 1px solid var(--border);
}

.footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .75rem;
}

.footer__domain {
  font-size: .9rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: -.01em;
}

.footer__copy {
  font-size: .85rem;
  color: var(--text-subtle);
}

/* ─── Mobile nav overlay ──────────────────────────────────────────────────── */

@media (max-width: 768px) {
  .nav__burger { display: flex; }

  .nav__links {
    display: none;
    flex-direction: column;
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem;
    gap: .25rem;
    box-shadow: var(--shadow);
  }

  .nav__links.is-open { display: flex; }

  .nav__links a {
    display: block;
    padding: .85rem 1rem;
    font-size: 1rem;
    border-radius: var(--radius-sm);
    color: var(--text);
  }

  .nav__links a:hover { background: var(--bg-tint); }

  .nav__cta {
    margin-top: .5rem;
    text-align: center;
  }
}

/* ─── Responsive ──────────────────────────────────────────────────────────── */

@media (max-width: 1000px) {
  .principles {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 900px) {
  .about__grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 700px) {
  :root { --section-gap: 64px; }

  .hero__inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero__photo {
    display: flex;
    justify-content: center;
    order: -1;
  }

  .hero__tagline { max-width: 100%; }
  .hero__actions { justify-content: center; }
  .hero__eyebrow { margin-inline: auto; }

  .cards,
  .projects,
  .principles {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .btn { width: 100%; justify-content: center; }

  .hero__actions,
  .kontakt__actions {
    flex-direction: column;
  }
}