/* ==========================================================================
   ALEXANDER HUNDENBORN — MINIMALIST EDITORIAL DESIGN
   Inspired by Dieter Rams, Jony Ive, and Swiss International Typographic Style.
   Principles: Honesty, clarity, generous whitespace, strict typography, zero gradients.
   ========================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Inter", "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", Menlo, Consolas, Monaco, monospace;

  /* Strict, non-gradient architectural palette */
  --bg-body: #0d0f12;
  --bg-surface: #14161b;
  --bg-surface-hover: #1a1d24;
  --bg-subtle: #1e222b;

  --border-light: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --border-focus: #ffffff;

  --text-primary: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-tertiary: #71717a;
  --text-muted: #52525b;

  --accent-ink: #3b82f6;        /* Single restrained accent */
  --accent-warm: #d97706;

  --radius-xs: 3px;
  --radius-sm: 6px;
  --radius-md: 10px;

  --space-unit: 8px;
  --container-max: 1120px;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-body);
  color: var(--text-primary);
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 16px;
  letter-spacing: -0.011em;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4 {
  color: var(--text-primary);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.65;
  font-weight: 400;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: #fff;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 2rem;
}

.mono-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  margin-bottom: 1rem;
  display: block;
}

/* Header & Minimalist Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: rgba(13, 15, 18, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  height: 64px;
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand-title {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-desc {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  margin-left: 0.5rem;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-item a {
  font-size: 0.88rem;
  color: var(--text-secondary);
  padding: 0.25rem 0;
  position: relative;
}

.nav-item a:hover,
.nav-item a.active {
  color: var(--text-primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-minimal {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-minimal:hover {
  background: var(--bg-surface-hover);
  border-color: #fff;
  color: #fff;
}

.btn-solid {
  background: #ffffff;
  color: #000000;
  border: 1px solid #ffffff;
}

.btn-solid:hover {
  background: #e4e4e7;
  color: #000000;
  border-color: #e4e4e7;
}

/* Sections */
.section {
  padding: 7rem 0;
  border-bottom: 1px solid var(--border-light);
}

.section-header {
  margin-bottom: 3.5rem;
  max-width: 720px;
}

.section-heading {
  font-size: 2.2rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

/* Hero Section */
.hero-section {
  padding: 10rem 0 7rem 0;
  border-bottom: 1px solid var(--border-light);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 4.5rem;
  align-items: start;
}

.hero-claim {
  font-size: 3.4rem;
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  margin-bottom: 2rem;
}

.hero-body {
  font-size: 1.25rem;
  line-height: 1.65;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 580px;
}

.hero-body strong {
  color: var(--text-primary);
  font-weight: 500;
}

.hero-meta {
  display: flex;
  gap: 2.5rem;
  border-top: 1px solid var(--border-light);
  padding-top: 2rem;
  margin-top: 2.5rem;
}

.meta-col {
  display: flex;
  flex-direction: column;
}

.meta-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 0.35rem;
  letter-spacing: 0.05em;
}

.meta-value {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* Hero Portrait - Honest & Editorial */
.hero-portrait-frame {
  position: relative;
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
}

.portrait-container {
  width: 100%;
  aspect-ratio: 4 / 5;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
}

.portrait-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 15%;
  display: block;
}

.portrait-caption-minimal {
  margin-top: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-top: 1px solid var(--border-light);
  padding-top: 0.75rem;
}

.caption-name {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
}

.caption-role {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

/* Numbers & Facts - Clean Minimalist Grid */
.facts-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  padding: 4rem 0;
  border-bottom: 1px solid var(--border-light);
}

.fact-item {
  border-left: 1px solid var(--border-light);
  padding-left: 1.5rem;
}

.fact-number {
  font-size: 2.5rem;
  font-weight: 500;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.fact-label {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* Philosophy & Leitbild */
.philosophy-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.philosophy-quote-block {
  font-size: 1.6rem;
  line-height: 1.4;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  font-weight: 400;
  border-left: 2px solid var(--border-strong);
  padding-left: 1.8rem;
}

.philosophy-text {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Grid of Domains / Focus Areas */
.grid-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.minimal-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.minimal-card:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-strong);
}

.card-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-bottom: 1.5rem;
}

.card-title {
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.85rem;
  letter-spacing: -0.02em;
}

.card-body {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Projects Section - Editorial List */
.projects-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border-light);
}

.project-row {
  display: grid;
  grid-template-columns: 0.3fr 0.9fr 1.3fr 0.5fr;
  gap: 2rem;
  padding: 2.2rem 0;
  border-bottom: 1px solid var(--border-light);
  align-items: baseline;
  transition: background-color 0.15s ease;
}

.project-row:hover {
  background-color: rgba(255, 255, 255, 0.02);
}

.project-year {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-tertiary);
}

.project-name-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.project-name {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text-primary);
}

.project-org {
  font-size: 0.82rem;
  color: var(--text-tertiary);
}

.project-desc-col {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.project-tags-col {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: flex-end;
}

.tag-pill {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.2rem 0.55rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xs);
  color: var(--text-tertiary);
}

/* Photo Switcher in Caption */
.caption-toggle {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 0;
  transition: color 0.15s ease;
}

.caption-toggle:hover,
.caption-toggle.active {
  color: #ffffff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Strengths Grid (Section 01 Positive Marketing) */
.strengths-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 3.5rem;
  border-top: 1px solid var(--border-light);
  padding-top: 2.5rem;
}

.strength-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.strength-title {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-primary);
}

.strength-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Expandable Publications Accordion */
.publications-section {
  margin-top: 3.5rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  overflow: hidden;
}

.publications-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  cursor: pointer;
  background: var(--bg-surface);
  transition: background-color 0.15s ease;
}

.publications-header-bar:hover {
  background: var(--bg-surface-hover);
}

.pub-header-title {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text-primary);
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.pub-count-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.pub-toggle-icon {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--text-secondary);
  transition: transform 0.2s ease;
}

.publications-drawer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
  opacity: 0;
  border-top: 0px solid var(--border-light);
}

.publications-section.expanded .publications-drawer {
  max-height: 2500px;
  opacity: 1;
  border-top: 1px solid var(--border-light);
  padding: 0 2rem 1.5rem 2rem;
}

.publications-section.expanded .pub-toggle-icon {
  transform: rotate(45deg);
}

.pub-row {
  display: grid;
  grid-template-columns: 70px 1fr 180px;
  gap: 1.5rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border-light);
  align-items: baseline;
}

.pub-row:last-child {
  border-bottom: none;
}

.pub-year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.pub-title-col {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.pub-title {
  font-size: 0.98rem;
  font-weight: 500;
  color: var(--text-primary);
}

.pub-publisher {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.pub-type {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-tertiary);
  text-align: right;
}

/* Career Timeline - Typographic Column */
.timeline-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border-light);
}

.timeline-row {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 3rem;
  padding: 2.2rem 0;
  border-bottom: 1px solid var(--border-light);
}

.timeline-period {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-tertiary);
}

.timeline-details {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.timeline-role {
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--text-primary);
}

.timeline-institution {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.timeline-summary {
  font-size: 0.92rem;
  color: var(--text-tertiary);
  line-height: 1.6;
}

/* Talks & Impulses */
.talks-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.talk-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 2rem;
}

.talk-meta-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.talk-heading {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.talk-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Contact & Dialog (Form Only) */
.contact-single-container {
  max-width: 720px;
  margin: 0 auto;
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 2.5rem 3rem;
  box-sizing: border-box;
}

/* Minimalist Form */
.form-minimal {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.form-row-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.input-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
}

.input-field {
  background: var(--bg-body);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-xs);
  padding: 0.8rem 1rem;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: border-color 0.15s ease;
  width: 100%;
  box-sizing: border-box;
}

.input-field:focus {
  outline: none;
  border-color: var(--border-focus);
}

select.input-field {
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238c92a4' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1.2rem center;
  padding-right: 2.5rem;
}

select.input-field option {
  background: #14171d;
  color: #f0f2f5;
}

textarea.input-field {
  min-height: 130px;
  resize: vertical;
  line-height: 1.5;
}

.form-footer-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0.25rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.form-status-msg {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.form-privacy-note {
  font-size: 0.76rem;
  color: var(--text-tertiary);
  line-height: 1.5;
  border-top: 1px solid var(--border-light);
  padding-top: 1.25rem;
  margin-top: 0.5rem;
}

/* Footer */
.site-footer {
  padding: 4rem 0;
  border-top: 1px solid var(--border-light);
  background-color: var(--bg-body);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--text-tertiary);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.footer-link-btn {
  background: none;
  border: none;
  color: var(--text-tertiary);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  cursor: pointer;
  padding: 0;
  transition: color 0.15s ease;
}

.footer-link-btn:hover {
  color: var(--text-primary);
}

/* Minimal Modal */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  padding: 1.5rem;
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.modal-card-minimal {
  background: #14161b;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  max-width: 680px;
  width: 100%;
  padding: 2.5rem;
  position: relative;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.modal-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0.3rem;
}

.modal-close:hover {
  color: #fff;
}

/* Subtle, Quiet Reveal */
.fade-in-section {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.fade-in-section.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .hero-claim {
    font-size: 2.5rem;
  }

  .grid-cards,
  .talks-grid,
  .facts-grid,
  .contact-grid,
  .philosophy-grid {
    grid-template-columns: 1fr;
  }

  .project-row {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .timeline-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .project-tags-col {
    justify-content: flex-start;
  }

  .fact-item {
    border-left: none;
    border-top: 1px solid var(--border-light);
    padding-left: 0;
    padding-top: 1.5rem;
  }
}

@media (max-width: 640px) {
  .nav-list {
    display: none;
  }

  .hero-meta {
    flex-direction: column;
    gap: 1.2rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 1.5rem;
    align-items: flex-start;
  }

  .contact-single-container {
    padding: 1.5rem;
  }

  .form-row-2col {
    grid-template-columns: 1fr;
    gap: 1.4rem;
  }
}

/* Print Stylesheet */
@media print {
  body {
    background: #fff !important;
    color: #000 !important;
  }

  .site-header, .site-footer, .modal-backdrop, .btn-minimal, .copy-link, form {
    display: none !important;
  }

  .hero-section, .section {
    padding: 2rem 0 !important;
    border-bottom: 1px solid #ddd !important;
  }

  .hero-claim {
    font-size: 24pt !important;
    color: #000 !important;
  }

  .text-secondary, .text-tertiary {
    color: #444 !important;
  }

  .minimal-card, .talk-box, .portrait-container {
    background: #fff !important;
    border: 1px solid #ccc !important;
  }
}