/* ============================================================
   aidX AG — Corporate Website
   Design: Professional Swiss Tech / Healthcare AI
   ============================================================ */

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

:root {
  --color-bg:        #0a0f1e;
  --color-bg2:       #0e1628;
  --color-bg3:       #111d35;
  --color-surface:   #162040;
  --color-border:    rgba(255,255,255,0.08);
  --color-primary:   #3b82f6;
  --color-primary2:  #60a5fa;
  --color-accent:    #06b6d4;
  --color-text:      #e8edf5;
  --color-muted:     #8899bb;
  --color-white:     #ffffff;
  --font-sans:       'Inter', 'Helvetica Neue', Arial, sans-serif;
  --radius:          8px;
  --radius-lg:       16px;
  --shadow:          0 4px 24px rgba(0,0,0,0.4);
  --nav-height:      72px;
  --max-w:           1140px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-primary2); text-decoration: none; transition: color .2s; }
a:hover { color: var(--color-accent); }

img { max-width: 100%; height: auto; display: block; }

/* ---- Layout Helpers ---- */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; }
.section--sm { padding: 64px 0; }
.section--lg { padding: 128px 0; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

.text-center { text-align: center; }
.text-muted   { color: var(--color-muted); }

/* ---- Typography ---- */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-white);
}
h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.8rem); }
h3 { font-size: 1.4rem; }
h4 { font-size: 1.1rem; }

.label {
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
  display: block;
}

.lead {
  font-size: 1.2rem;
  color: var(--color-muted);
  margin-top: 20px;
  max-width: 640px;
}

p + p { margin-top: 1em; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  text-decoration: none;
  border: none;
}
.btn--primary {
  background: var(--color-primary);
  color: #fff;
}
.btn--primary:hover {
  background: #2563eb;
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(59,130,246,.35);
}
.btn--outline {
  background: transparent;
  color: var(--color-primary2);
  border: 1.5px solid var(--color-primary);
}
.btn--outline:hover {
  background: rgba(59,130,246,.1);
  color: var(--color-primary2);
}
.btn--ghost {
  background: rgba(255,255,255,.06);
  color: var(--color-text);
}
.btn--ghost:hover {
  background: rgba(255,255,255,.12);
  color: var(--color-white);
}

/* ---- Logo Images ---- */
.nav__logo-img {
  height: 36px;
  width: auto;
  display: block;
  filter: brightness(0) invert(1);
}
.footer__logo-link {
  display: inline-block;
  text-decoration: none;
}
.footer__logo-img {
  height: 40px;
  width: auto;
  display: block;
  filter: brightness(0) invert(1);
}
.footer__logo-chat {
  height: 52px;
  width: auto;
  margin-top: 20px;
  filter: brightness(0) invert(1);
  opacity: 0.85;
}

/* ---- aidX brand styling ---- */
.aidx-x { font-style: italic; }

/* ---- Navigation ---- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 100;
  background: rgba(10,15,30,.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background .3s;
}
.nav__inner {
  display: flex;
  align-items: center;
  height: 100%;
  gap: 0;
}
.nav__logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  margin-right: 48px;
  flex-shrink: 0;
}
.nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  flex: 1;
}
.nav__links a {
  padding: 8px 14px;
  border-radius: var(--radius);
  font-size: .9rem;
  font-weight: 500;
  color: var(--color-muted);
  transition: all .2s;
}
.nav__links a:hover,
.nav__links a.active { color: var(--color-white); background: rgba(255,255,255,.06); }
.nav__cta { margin-left: auto; }
.nav__burger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; }
.nav__burger span { display: block; width: 22px; height: 2px; background: var(--color-text); border-radius: 2px; transition: all .3s; }

/* ---- Hero ---- */
.hero {
  padding: calc(var(--nav-height) + 80px) 0 100px;
  background: var(--color-bg);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -200px; right: -200px;
  width: 700px; height: 700px;
  background: radial-gradient(circle, rgba(59,130,246,.12) 0%, transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -100px; left: -100px;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(6,182,212,.08) 0%, transparent 70%);
  pointer-events: none;
}
.hero__content { position: relative; z-index: 1; }
.hero h1 { margin-bottom: 24px; }
.hero h1 em { font-style: normal; color: var(--color-primary2); }
.hero__ctas { display: flex; gap: 16px; margin-top: 40px; flex-wrap: wrap; }
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(6,182,212,.12);
  border: 1px solid rgba(6,182,212,.3);
  color: var(--color-accent);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: .8rem;
  font-weight: 600;
  margin-bottom: 24px;
}
.hero__badge::before { content: '●'; font-size: .5rem; }

/* ---- Cards ---- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: border-color .3s, transform .2s;
}
.card:hover {
  border-color: rgba(59,130,246,.3);
  transform: translateY(-2px);
}
.card__icon {
  width: 48px; height: 48px;
  background: rgba(59,130,246,.15);
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 20px;
  flex-shrink: 0;
}
.card h3 { margin-bottom: 10px; }
.card p { color: var(--color-muted); font-size: .95rem; }

/* ---- Feature Strip ---- */
.feature-strip {
  display: flex;
  gap: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.feature-strip__item {
  flex: 1;
  padding: 32px 24px;
  text-align: center;
  border-right: 1px solid var(--color-border);
}
.feature-strip__item:last-child { border-right: none; }
.feature-strip__num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary2);
  display: block;
}
.feature-strip__label { font-size: .85rem; color: var(--color-muted); margin-top: 4px; }

/* ---- Section Divider ---- */
.divider { border: none; border-top: 1px solid var(--color-border); margin: 0; }

/* ---- Badge / Tag ---- */
.tag {
  display: inline-block;
  background: rgba(59,130,246,.12);
  color: var(--color-primary2);
  border: 1px solid rgba(59,130,246,.25);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: .8rem;
  font-weight: 600;
}
.tag--green {
  background: rgba(16,185,129,.12);
  color: #34d399;
  border-color: rgba(16,185,129,.25);
}
.tag--cyan {
  background: rgba(6,182,212,.12);
  color: var(--color-accent);
  border-color: rgba(6,182,212,.25);
}

/* ---- Section Headers ---- */
.section-header { margin-bottom: 64px; }
.section-header h2 { margin-bottom: 16px; }
.section-header p { color: var(--color-muted); max-width: 600px; }
.section-header.text-center p { margin: 0 auto; }

/* ---- Checklist ---- */
.checklist { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.checklist li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  color: var(--color-muted);
  font-size: .95rem;
}
.checklist li::before {
  content: '✓';
  color: #34d399;
  font-weight: 700;
  margin-top: 2px;
  flex-shrink: 0;
}

/* ---- Team Card ---- */
.team-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
}
.team-card__avatar {
  width: 80px; height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem;
  margin: 0 auto 20px;
}
.team-card h3 { font-size: 1.1rem; margin-bottom: 4px; }
.team-card__role { color: var(--color-accent); font-size: .85rem; font-weight: 600; }
.team-card p { color: var(--color-muted); font-size: .9rem; margin-top: 12px; }

/* ---- Contact Form ---- */
.form { display: flex; flex-direction: column; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label { font-size: .85rem; font-weight: 600; color: var(--color-muted); }
.form-group input,
.form-group textarea,
.form-group select {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 12px 16px;
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: .95rem;
  transition: border-color .2s;
  width: 100%;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
}
.form-group textarea { min-height: 140px; resize: vertical; }

/* ---- Info Box ---- */
.info-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.info-box h3 { margin-bottom: 16px; }

/* ---- Legal / Prose ---- */
.prose h2 { font-size: 1.5rem; margin-top: 48px; margin-bottom: 16px; }
.prose h3 { font-size: 1.15rem; margin-top: 32px; margin-bottom: 12px; }
.prose p { color: var(--color-muted); margin-bottom: 16px; }
.prose ul { list-style: disc; padding-left: 24px; color: var(--color-muted); margin-bottom: 16px; }
.prose ul li { margin-bottom: 8px; }
.prose a { color: var(--color-primary2); }

/* ---- Page Hero (inner pages) ---- */
.page-hero {
  padding: calc(var(--nav-height) + 64px) 0 64px;
  background: linear-gradient(180deg, var(--color-bg2) 0%, var(--color-bg) 100%);
  border-bottom: 1px solid var(--color-border);
}
.page-hero h1 { font-size: clamp(1.8rem, 4vw, 3rem); }
.page-hero p { color: var(--color-muted); margin-top: 16px; max-width: 640px; font-size: 1.1rem; }

/* ---- Footer ---- */
.footer {
  background: var(--color-bg2);
  border-top: 1px solid var(--color-border);
  padding: 64px 0 32px;
}
.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer__brand p { color: var(--color-muted); font-size: .9rem; margin-top: 12px; max-width: 280px; }
.footer__col h4 { font-size: .85rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--color-muted); margin-bottom: 16px; }
.footer__col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer__col ul a { color: var(--color-muted); font-size: .9rem; }
.footer__col ul a:hover { color: var(--color-text); }
.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
  font-size: .85rem;
  color: var(--color-muted);
}
.footer__bottom a { color: var(--color-muted); }
.footer__bottom a:hover { color: var(--color-text); }

/* ---- Mobile ---- */
@media (max-width: 900px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .feature-strip { flex-direction: column; }
  .feature-strip__item { border-right: none; border-bottom: 1px solid var(--color-border); }
  .feature-strip__item:last-child { border-bottom: none; }
}

@media (max-width: 640px) {
  .nav__links, .nav__cta { display: none; }
  .nav__burger { display: flex; }
  .nav__links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    background: var(--color-bg2);
    border-bottom: 1px solid var(--color-border);
    padding: 16px;
  }
  .hero__ctas { flex-direction: column; }
  .footer__grid { grid-template-columns: 1fr; }
  .footer__bottom { flex-direction: column; gap: 12px; text-align: center; }
}

/* ---- Privacy Chain ---- */
.privacy-chain {
  max-width: 760px;
  margin: 56px auto 0;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0;
}

.chain-boundary {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: 8px 16px;
  border-radius: 6px;
  margin: 12px 0;
}
.chain-boundary--device {
  background: rgba(16,185,129,.08);
  border: 1px solid rgba(16,185,129,.2);
  color: #34d399;
}
.chain-boundary--server {
  background: rgba(59,130,246,.08);
  border: 1px solid rgba(59,130,246,.2);
  color: #60a5fa;
  margin-top: 24px;
}

.chain-arrow {
  text-align: center;
  font-size: 1.4rem;
  color: var(--color-muted);
  line-height: 1;
  margin: 4px 0;
}

.chain-step {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  background: var(--color-surface);
  border: 1px solid rgba(16,185,129,.15);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 4px 0;
}
.chain-step--server {
  border-color: rgba(59,130,246,.2);
  background: rgba(59,130,246,.04);
}

.chain-step__icon {
  font-size: 1.6rem;
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: rgba(255,255,255,.05);
}
.chain-step__icon--green { background: rgba(16,185,129,.12); }
.chain-step__icon--cyan  { background: rgba(6,182,212,.12); }
.chain-step__icon--accent { background: rgba(59,130,246,.12); }

.chain-step__body { flex: 1; min-width: 0; }
.chain-step__body h4 { font-size: 1rem; font-weight: 600; margin-bottom: 6px; }
.chain-step__body p  { font-size: .88rem; color: var(--color-muted); line-height: 1.65; }

.chain-step__badge {
  flex-shrink: 0;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 20px;
  background: rgba(59,130,246,.15);
  color: #60a5fa;
  align-self: flex-start;
}
.chain-step__badge--local {
  background: rgba(16,185,129,.15);
  color: #34d399;
}

@media (max-width: 640px) {
  .chain-step { flex-wrap: wrap; }
  .chain-step__badge { align-self: auto; }
}