/* =========================================================
   Yves Bischofberger — Personal Site
   Dark, minimal, technical
   ========================================================= */

:root {
  --bg: #07090d;
  --bg-2: #0a0e14;
  --bg-3: #0f141c;
  --surface: rgba(255, 255, 255, 0.025);
  --surface-2: rgba(255, 255, 255, 0.045);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #e6edf5;
  --text-dim: #8a94a6;
  --text-mute: #5b6473;
  --accent: #00d9ff;
  --accent-2: #38bdf8;
  --accent-glow: rgba(0, 217, 255, 0.35);
  --navy: #0b1426;

  --radius: 14px;
  --radius-lg: 22px;
  --max-w: 1200px;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  font-size: 16px;
  letter-spacing: -0.005em;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; background: none; border: none; color: inherit; }

::selection { background: var(--accent); color: var(--bg); }

/* =========================================================
   Background layers
   ========================================================= */
.bg-grid {
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 30%, transparent 75%);
  pointer-events: none;
  z-index: 0;
}

.bg-glow {
  position: fixed;
  width: 600px; height: 600px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.35;
  pointer-events: none;
  z-index: 0;
  will-change: transform;
}
.bg-glow-1 {
  background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
  top: -200px; left: -150px;
  animation: floatGlow 18s ease-in-out infinite;
}
.bg-glow-2 {
  background: radial-gradient(circle, #1e3a8a 0%, transparent 70%);
  top: 30%; right: -200px;
  animation: floatGlow 22s ease-in-out infinite reverse;
}

@keyframes floatGlow {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(50px, 80px) scale(1.1); }
}

#particles {
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

main, .nav, .footer { position: relative; z-index: 2; }

/* =========================================================
   Containers
   ========================================================= */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
}

@media (min-width: 720px) { .container { padding: 0 32px; } }
@media (min-width: 1100px) { .container { padding: 0 48px; } }

/* =========================================================
   Navigation
   ========================================================= */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: padding 0.3s var(--ease), background 0.3s var(--ease), backdrop-filter 0.3s var(--ease);
}

.nav.scrolled {
  padding: 10px 0;
  background: rgba(7, 9, 13, 0.7);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
@media (min-width: 720px) { .nav-inner { padding: 0 32px; } }
@media (min-width: 1100px) { .nav-inner { padding: 0 48px; } }

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: -0.01em;
  font-size: 15px;
}
.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px; height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(0,217,255,0.15), rgba(0,217,255,0.04));
  border: 1px solid var(--border-strong);
  color: var(--accent);
}
.logo-text { color: var(--text); }
.logo-dot { color: var(--accent); }

.nav-links {
  display: none;
  gap: 32px;
}
@media (min-width: 920px) { .nav-links { display: flex; } }

.nav-links a {
  font-size: 14px;
  color: var(--text-dim);
  transition: color 0.2s var(--ease);
  position: relative;
}
.nav-links a:hover { color: var(--text); }
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; right: 100%;
  bottom: -6px;
  height: 1px;
  background: var(--accent);
  transition: right 0.3s var(--ease);
}
.nav-links a:hover::after { right: 0; }

.nav-cta {
  display: none;
  font-size: 13px;
  padding: 9px 16px;
  border-radius: 8px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  transition: all 0.2s var(--ease);
}
.nav-cta:hover {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
}
@media (min-width: 920px) { .nav-cta { display: inline-flex; } }

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 28px; height: 18px;
  padding: 0;
}
.nav-toggle span {
  height: 1.5px;
  background: var(--text);
  transition: all 0.3s var(--ease);
  transform-origin: center;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
@media (min-width: 920px) { .nav-toggle { display: none; } }

.mobile-menu {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: rgba(7, 9, 13, 0.95);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  padding: 90px 32px 40px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transform: translateY(-100%);
  transition: transform 0.4s var(--ease-out);
  z-index: 90;
  border-bottom: 1px solid var(--border);
}
.mobile-menu.open { transform: translateY(0); }
.mobile-menu a {
  padding: 18px 0;
  font-size: 22px;
  font-weight: 500;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}
.mobile-menu a:hover { color: var(--accent); padding-left: 8px; }

/* =========================================================
   Buttons
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 22px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.01em;
  transition: all 0.25s var(--ease);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  box-shadow: 0 0 0 0 var(--accent-glow), 0 8px 30px -8px rgba(0, 217, 255, 0.4);
}
.btn-primary:hover {
  background: #1ee0ff;
  box-shadow: 0 0 40px -4px var(--accent-glow), 0 8px 40px -8px rgba(0, 217, 255, 0.6);
  transform: translateY(-1px);
}
.btn-primary svg { transition: transform 0.25s var(--ease); }
.btn-primary:hover svg { transform: translateX(3px); }

.btn-ghost {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border-strong);
}
.btn-ghost:hover {
  background: var(--surface-2);
  border-color: var(--accent);
  color: var(--accent);
}

/* =========================================================
   Hero
   ========================================================= */
.hero {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  position: relative;
  padding: 120px 0 100px;
}

.hero-inner {
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 14px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 100px;
  font-size: 12.5px;
  font-family: var(--font-mono);
  color: var(--text-dim);
  letter-spacing: 0.02em;
  margin-bottom: 32px;
}
.pulse {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.hero-title {
  font-size: clamp(48px, 11vw, 144px);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.04em;
  margin-bottom: 32px;
}
.hero-title .line {
  display: block;
  overflow: hidden;
}
.gradient {
  background: linear-gradient(135deg, var(--accent) 0%, #6366f1 60%, #38bdf8 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero-sub {
  font-family: var(--font-mono);
  font-size: clamp(12px, 1.6vw, 14px);
  color: var(--text-dim);
  letter-spacing: 0.04em;
  margin-bottom: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}
.hero-sub .sep { color: var(--accent); opacity: 0.6; }

.hero-text {
  font-size: clamp(15px, 1.7vw, 18px);
  color: var(--text-dim);
  max-width: 640px;
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 48px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-mute);
  letter-spacing: 0.04em;
}
.meta-item { display: inline-flex; align-items: center; gap: 8px; }
.meta-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 6px #22c55e;
}
.meta-dot-cyan {
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent);
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-mute);
  letter-spacing: 0.2em;
  text-transform: uppercase;
}
.hero-scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(180deg, var(--accent), transparent);
  animation: scrollLine 2.5s ease-in-out infinite;
  transform-origin: top;
}
@keyframes scrollLine {
  0%, 100% { transform: scaleY(1); opacity: 1; }
  50% { transform: scaleY(0.4); opacity: 0.4; }
}
@media (max-width: 720px) { .hero-scroll { display: none; } }

/* =========================================================
   Sections
   ========================================================= */
.section {
  padding: 100px 0;
  position: relative;
}
@media (min-width: 920px) { .section { padding: 140px 0; } }

.section-head {
  margin-bottom: 60px;
  max-width: 720px;
}
@media (min-width: 920px) { .section-head { margin-bottom: 80px; } }

.section-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: 20px;
}

.section-title {
  font-size: clamp(34px, 5vw, 60px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.section-intro {
  font-size: clamp(15px, 1.6vw, 18px);
  color: var(--text-dim);
  line-height: 1.7;
  max-width: 600px;
}

/* =========================================================
   Cards Grid (Kompetenzen)
   ========================================================= */
.grid { display: grid; gap: 16px; }
.grid-cards { grid-template-columns: 1fr; }
@media (min-width: 720px) { .grid-cards { grid-template-columns: repeat(2, 1fr); gap: 20px; } }
@media (min-width: 1080px) { .grid-cards { grid-template-columns: repeat(3, 1fr); } }

.card {
  position: relative;
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.35s var(--ease);
  overflow: hidden;
  isolation: isolate;
}

.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(circle at var(--mx, 50%) var(--my, 0%), rgba(0,217,255,0.08), transparent 60%);
  opacity: 0;
  transition: opacity 0.35s var(--ease);
  pointer-events: none;
  z-index: -1;
}

.card:hover {
  border-color: var(--border-strong);
  background: var(--surface-2);
  transform: translateY(-3px);
}
.card:hover::before { opacity: 1; }

.card-icon {
  width: 44px; height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(0,217,255,0.12), rgba(0,217,255,0.02));
  border: 1px solid var(--border-strong);
  color: var(--accent);
  margin-bottom: 22px;
  transition: all 0.3s var(--ease);
}
.card:hover .card-icon {
  box-shadow: 0 0 20px -6px var(--accent-glow);
  border-color: var(--accent);
}

.card h3 {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin-bottom: 10px;
}

.card-text {
  font-size: 14.5px;
  color: var(--text-dim);
  line-height: 1.6;
  margin-bottom: 20px;
}

.tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.tags li {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 9px;
  border-radius: 5px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  color: var(--text-dim);
  letter-spacing: 0.01em;
}

/* =========================================================
   Claim
   ========================================================= */
.claim-section { padding: 120px 0; }

.claim { max-width: 1100px; }
.claim-title {
  font-size: clamp(28px, 5.5vw, 64px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 32px;
}
.claim-text {
  font-size: clamp(15px, 1.7vw, 19px);
  color: var(--text-dim);
  max-width: 700px;
  line-height: 1.7;
}

/* =========================================================
   Projekte
   ========================================================= */
.grid-projects { grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 720px) { .grid-projects { grid-template-columns: repeat(2, 1fr); gap: 20px; } }

.project {
  display: flex;
  flex-direction: column;
  padding: 36px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all 0.35s var(--ease);
  position: relative;
  overflow: hidden;
  min-height: 240px;
}
.project::after {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
}
.project:hover {
  border-color: var(--border-strong);
  background: var(--surface-2);
  transform: translateY(-4px);
}
.project:hover::after { opacity: 1; }

.project-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-mute);
  margin-bottom: 28px;
}
.project h3 {
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}
.project p {
  font-size: 15px;
  color: var(--text-dim);
  line-height: 1.65;
  margin-bottom: 28px;
  flex: 1;
}

.project-link {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: gap 0.25s var(--ease);
}
.project:hover .project-link { gap: 12px; }
.project-link-static { color: var(--text-mute); }

/* =========================================================
   Technologien Badges
   ========================================================= */
.tech-section .badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.badge {
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 9px 16px;
  border-radius: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-dim);
  transition: all 0.25s var(--ease);
  cursor: default;
  letter-spacing: 0.01em;
}
.badge:hover {
  background: var(--surface-2);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px -10px var(--accent-glow);
}

/* =========================================================
   Philosophie & About
   ========================================================= */
.philo-grid, .about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}
@media (min-width: 920px) {
  .philo-grid, .about-grid {
    grid-template-columns: 1fr 1fr;
    gap: 80px;
  }
}

.philo-text p, .about-text p {
  font-size: clamp(15px, 1.6vw, 18px);
  color: var(--text-dim);
  line-height: 1.75;
  margin-bottom: 18px;
}
.philo-text p:first-child, .about-text p:first-child {
  color: var(--text);
  font-size: clamp(17px, 1.8vw, 20px);
}

/* =========================================================
   Kontakt
   ========================================================= */
.contact-section { padding-bottom: 140px; }

.contact-card {
  background: linear-gradient(135deg, rgba(0,217,255,0.04), rgba(255,255,255,0.02));
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 48px 32px;
  position: relative;
  overflow: hidden;
}
@media (min-width: 720px) { .contact-card { padding: 64px 56px; } }

.contact-card::before {
  content: '';
  position: absolute;
  top: -50%; right: -20%;
  width: 60%; height: 200%;
  background: radial-gradient(ellipse, var(--accent-glow), transparent 60%);
  filter: blur(80px);
  opacity: 0.3;
  pointer-events: none;
}

.contact-title {
  font-size: clamp(28px, 4.5vw, 52px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 20px 0 16px;
}
.contact-sub {
  color: var(--text-dim);
  margin-bottom: 40px;
  font-size: clamp(15px, 1.6vw, 17px);
}

.contact-mail {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 56px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-strong);
  transition: all 0.25s var(--ease);
}
.contact-mail svg { transition: transform 0.25s var(--ease); color: var(--accent); }
.contact-mail:hover { color: var(--accent); border-color: var(--accent); }
.contact-mail:hover svg { transform: translate(4px, -4px); }

.contact-links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  position: relative;
}
@media (min-width: 720px) { .contact-links { grid-template-columns: 1fr 1fr; } }

.contact-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.25s var(--ease);
}
.contact-link:hover {
  border-color: var(--accent);
  background: var(--surface-2);
  transform: translateY(-2px);
}
.contact-link-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-mute);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.contact-link-url {
  font-size: 17px;
  color: var(--text);
  font-weight: 500;
}
.contact-link:hover .contact-link-url { color: var(--accent); }

/* =========================================================
   Footer
   ========================================================= */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  background: rgba(7, 9, 13, 0.5);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: flex-start;
  justify-content: space-between;
}
@media (min-width: 720px) {
  .footer-inner { flex-direction: row; align-items: center; }
}

.footer-name {
  font-weight: 600;
  font-size: 15px;
  margin-bottom: 4px;
}
.footer-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-mute);
  letter-spacing: 0.03em;
}

.footer-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-mute);
  display: flex;
  gap: 12px;
  align-items: center;
}
.footer-sep { color: var(--accent); opacity: 0.5; }

/* =========================================================
   Reveal Animations
   ========================================================= */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* =========================================================
   Focus visible
   ========================================================= */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}