/* ============================================
   Fabian Merz — Personal Website
   Modern, minimal, mobile-first
   ============================================ */

/* --- Custom Properties --- */
:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  --color-accent: #0891b2;
  --color-accent-hover: #0e7490;
  --color-accent-light: #ecfeff;
  --color-accent-subtle: #cffafe;
  --color-border: #e2e8f0;
  --color-hero-bg: #0f172a;
  --color-hero-text: #f8fafc;
  --color-hero-muted: #94a3b8;
  --color-card-shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --color-card-shadow-hover: 0 10px 25px rgba(0,0,0,.08), 0 4px 10px rgba(0,0,0,.04);
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --max-width: 1120px;
  --nav-height: 64px;
  --transition: 0.25s cubic-bezier(.4,0,.2,1);
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-height); }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent-hover); }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 1000;
  padding: 8px 16px;
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.875rem;
}
.skip-link:focus { top: 8px; color: #fff; }

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.9375rem;
  transition: all var(--transition);
  white-space: nowrap;
  line-height: 1.4;
}
.btn--primary {
  background: var(--color-accent);
  color: #fff;
  border: 2px solid var(--color-accent);
}
.btn--primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(8,145,178,.3);
}
.btn--outline {
  background: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}
.btn--outline:hover {
  background: var(--color-accent);
  color: #fff;
  transform: translateY(-1px);
}
.btn--full { width: 100%; justify-content: center; }

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,.06);
  transition: background var(--transition), box-shadow var(--transition);
}
.nav--scrolled {
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 3px rgba(0,0,0,.05);
}
.nav--scrolled .nav__logo { color: var(--color-text); }
.nav--scrolled .nav__link { color: var(--color-text-secondary); }
.nav--scrolled .nav__link:hover,
.nav--scrolled .nav__link--active { color: var(--color-accent); }
.nav--scrolled .nav__toggle-bar { background: var(--color-text); }

.nav__container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.02em;
}
.nav__logo .accent { color: var(--color-accent); }
.nav__toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  z-index: 110;
}
.nav__toggle-bar {
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition);
}
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) {
  opacity: 0;
}
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}
.nav__menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: min(320px, 80vw);
  height: 100vh;
  height: 100dvh;
  background: var(--color-hero-bg);
  padding: calc(var(--nav-height) + 2rem) 2rem 2rem;
  transition: right var(--transition);
  z-index: 105;
}
.nav__menu--open { right: 0; }
.nav__list { display: flex; flex-direction: column; gap: 0; }
.nav__link {
  display: block;
  padding: 14px 0;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--color-hero-muted);
  transition: color var(--transition);
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.nav__link:hover,
.nav__link--active { color: #fff; }

/* Desktop nav */
@media (min-width: 768px) {
  .nav__toggle { display: none; }
  .nav__menu {
    position: static;
    width: auto;
    height: auto;
    background: transparent;
    padding: 0;
  }
  .nav__list { flex-direction: row; gap: 32px; }
  .nav__link {
    padding: 0;
    font-size: 0.875rem;
    font-weight: 500;
    color: rgba(255,255,255,.65);
    border-bottom: none;
  }
  .nav__link:hover { color: #fff; }
  .nav--scrolled .nav__link { color: var(--color-text-secondary); }
  .nav--scrolled .nav__link:hover { color: var(--color-accent); }
}

/* Mobile nav overlay */
.nav__overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 104;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}
.nav__overlay--visible { opacity: 1; visibility: visible; }

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  background: var(--color-hero-bg);
  color: var(--color-hero-text);
  overflow: hidden;
  padding-top: var(--nav-height);
}
.hero__bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(8,145,178,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(8,145,178,.07) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 100%);
}
.hero__content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
  padding-top: 3rem;
  padding-bottom: 5rem;
}
.hero__greeting {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}
.hero__name {
  font-size: clamp(2.2rem, 6vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 0.5rem;
}
.hero__title {
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  font-weight: 400;
  color: var(--color-hero-muted);
  margin-bottom: 1.25rem;
}
.hero__tagline {
  font-size: 1rem;
  color: var(--color-hero-muted);
  max-width: 540px;
  margin-bottom: 2rem;
  line-height: 1.7;
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 2.5rem;
}
.hero__actions .btn--outline {
  color: #fff;
  border-color: rgba(255,255,255,.25);
}
.hero__actions .btn--outline:hover {
  background: rgba(255,255,255,.08);
  border-color: rgba(255,255,255,.4);
  color: #fff;
}
.hero__social {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
.hero__social-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-hero-muted);
  transition: color var(--transition);
}
.hero__social-link:hover { color: var(--color-accent); }
.hero__image { display: flex; justify-content: center; }
.hero__image-wrapper {
  position: relative;
  width: 220px;
  height: 220px;
}
.hero__image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  position: relative;
  z-index: 1;
  border: 3px solid rgba(8,145,178,.4);
}
.hero__image-border {
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  border: 2px dashed rgba(8,145,178,.25);
  animation: spin 30s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.hero__scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}
.hero__scroll a { color: var(--color-hero-muted); }
@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-8px); }
  60% { transform: translateX(-50%) translateY(-4px); }
}

@media (min-width: 768px) {
  .hero__content {
    grid-template-columns: 1fr auto;
    padding-top: 0;
    padding-bottom: 0;
  }
  .hero__image-wrapper { width: 280px; height: 280px; }
}
@media (min-width: 1024px) {
  .hero__image-wrapper { width: 320px; height: 320px; }
}

/* --- Animate In --- */
.animate-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  transition-delay: var(--delay, 0s);
}
.animate-in--visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Section --- */
.section {
  padding: 5rem 0;
}
.section--alt { background: var(--color-bg-alt); }
.section__title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  position: relative;
  display: inline-block;
}
.section__title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 48px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
}
.section__subtitle {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: 3rem;
  max-width: 600px;
}

/* --- About --- */
.about__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  margin-top: 2rem;
}
.about__text p {
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}
.about__intro { font-size: 1.0625rem; }
.about__intro strong { color: var(--color-text); }
.about__highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}
.about__highlight { text-align: center; }
.about__highlight-number {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
}
.about__highlight-label {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  font-weight: 500;
}
.about__details-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: var(--color-text);
}
.about__strengths li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
}
.about__strengths li:last-child { border-bottom: none; }
.about__strengths svg { color: var(--color-accent); flex-shrink: 0; }

@media (min-width: 768px) {
  .about__grid { grid-template-columns: 1.2fr 1fr; }
}

/* --- Timeline / Experience --- */
.timeline {
  position: relative;
  margin-top: 2rem;
  padding-left: 2rem;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}
.timeline__item {
  position: relative;
  padding-bottom: 2.5rem;
}
.timeline__item:last-child { padding-bottom: 0; }
.timeline__marker {
  position: absolute;
  left: -2rem;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid var(--color-bg-alt);
  z-index: 1;
}
.timeline__marker--edu {
  background: var(--color-text-muted);
}
.timeline__content {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--color-card-shadow);
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}
.timeline__content:hover {
  box-shadow: var(--color-card-shadow-hover);
}
.timeline__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}
.timeline__role {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-text);
}
.timeline__company {
  font-size: 0.9375rem;
  color: var(--color-accent);
  font-weight: 500;
}
.timeline__date {
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  white-space: nowrap;
}
.timeline__location {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}
.timeline__details {
  list-style: disc;
  padding-left: 1.2rem;
}
.timeline__details li {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.35rem;
  line-height: 1.6;
}

@media (min-width: 768px) {
  .timeline { padding-left: 3rem; }
  .timeline__marker { left: -3rem; }
}

/* --- Skills --- */
.skills__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
}
.skills__category {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: box-shadow var(--transition);
}
.skills__category:hover { box-shadow: var(--color-card-shadow-hover); }
.skills__category-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--color-text);
}
.skills__category-title svg { color: var(--color-accent); }
.skills__tags { display: flex; flex-wrap: wrap; gap: 8px; }
.skill-tag {
  display: inline-block;
  padding: 6px 14px;
  background: var(--color-accent-light);
  color: var(--color-accent-hover);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 500;
  transition: all var(--transition);
}
.skill-tag:hover {
  background: var(--color-accent);
  color: #fff;
}
.skill-tag--vendor {
  background: var(--color-hero-bg);
  color: #fff;
}
.skill-tag--vendor:hover {
  background: var(--color-accent);
}

@media (min-width: 640px) {
  .skills__grid { grid-template-columns: repeat(2, 1fr); }
}

/* --- Certifications / Badges --- */
.certs__tier-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 1.25rem;
  margin-top: 2rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.8125rem;
}
.badges__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}
.badge-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1.25rem 0.75rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
  color: var(--color-text);
}
.badge-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--color-card-shadow-hover);
  border-color: var(--color-accent);
  color: var(--color-text);
}
.badge-card__img {
  width: 80px;
  height: 80px;
  margin-bottom: 0.75rem;
  object-fit: contain;
}
.badge-card__name {
  font-size: 0.8125rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 0.25rem;
}
.badge-card__issuer {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: 0.35rem;
}
.badge-card__date {
  font-size: 0.6875rem;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
}
.certs__cta {
  text-align: center;
  margin-top: 2.5rem;
}

/* --- Projects --- */
.projects__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 2rem;
}
.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: all var(--transition);
}
.project-card:hover {
  box-shadow: var(--color-card-shadow-hover);
  transform: translateY(-2px);
}
.project-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}
.project-card__header > svg { color: var(--color-accent); }
.project-card__links { display: flex; gap: 12px; }
.project-card__links a {
  color: var(--color-text-muted);
  transition: color var(--transition);
}
.project-card__links a:hover { color: var(--color-accent); }
.project-card__title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}
.project-card__subtitle {
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}
.project-card__desc {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 1.25rem;
  line-height: 1.6;
}
.project-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.project-card__tech span {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
}
.project-card__tech span::before {
  content: '#';
  color: var(--color-accent);
}

@media (min-width: 640px) {
  .projects__grid { grid-template-columns: repeat(2, 1fr); }
}

/* --- Contact --- */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  margin-top: 2rem;
}
.contact__form { display: flex; flex-direction: column; gap: 1.25rem; }
.form-group { display: flex; flex-direction: column; gap: 0.5rem; }
.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
}
.form-input {
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-input::placeholder { color: var(--color-text-muted); }
.form-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(8,145,178,.15);
}
.form-textarea { resize: vertical; min-height: 120px; }

.contact__info {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.contact__card {
  background: var(--color-hero-bg);
  color: var(--color-hero-text);
  border-radius: var(--radius-md);
  padding: 2rem;
}
.contact__card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}
.contact__card p {
  color: var(--color-hero-muted);
  font-size: 0.9375rem;
  margin-bottom: 1.5rem;
  line-height: 1.7;
}
.contact__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.contact__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-hero-muted);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
}
.contact__link:hover { color: var(--color-accent); }

.contact__cv-btn {
  border-color: var(--color-border);
  color: var(--color-text);
}
.contact__cv-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-light);
}

@media (min-width: 768px) {
  .contact__grid { grid-template-columns: 1fr 1fr; }
}

/* --- Footer --- */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
}
.footer__content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer__content p {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}
.footer__links {
  display: flex;
  gap: 16px;
}
.footer__links a {
  color: var(--color-text-muted);
  transition: color var(--transition);
}
.footer__links a:hover { color: var(--color-accent); }

/* --- Scroll reveal animation --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Print Styles --- */
@media print {
  .nav, .hero__scroll, .contact__form, .footer, .btn { display: none; }
  .hero { min-height: auto; padding: 2rem 0; }
  .section { padding: 2rem 0; }
  body { font-size: 12pt; }
}