/* ============================================
   Zoltan C. Toth — Personal Consultant Website
   ============================================ */

/* --- Custom Properties --- */
:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f7f8fa;
  --color-text: #1a1a2e;
  --color-text-muted: #5a5a72;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-border: #e5e7eb;
  --color-card-bg: #ffffff;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1120px;
  --nav-height: 64px;
  --radius: 8px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

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

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-accent-hover);
}

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

/* --- Section --- */
.section {
  padding: 80px 0;
}

.section--alt {
  background: var(--color-bg-alt);
}

.section__title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.section__subtitle {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  margin-bottom: 48px;
  max-width: 600px;
}

.section__note {
  margin-top: 32px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  display: flex;
  align-items: center;
}

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

.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
  text-decoration: none;
}

.nav__brand img {
  height: 32px;
  width: auto;
  position: relative;
  top: -4px;
}

.nav__links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav__links a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition);
}

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

.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  margin: 5px 0;
  transition: var(--transition);
}

/* --- Scroll Animations --- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.fade-in {
  opacity: 0;
  transform: translateY(24px);
}

.fade-in.is-visible {
  animation: fadeUp 0.6s ease forwards;
}

/* stagger children */
.fade-in.is-visible:nth-child(2) { animation-delay: 0.08s; }
.fade-in.is-visible:nth-child(3) { animation-delay: 0.16s; }
.fade-in.is-visible:nth-child(4) { animation-delay: 0.24s; }
.fade-in.is-visible:nth-child(5) { animation-delay: 0.32s; }
.fade-in.is-visible:nth-child(6) { animation-delay: 0.40s; }
.fade-in.is-visible:nth-child(7) { animation-delay: 0.48s; }
.fade-in.is-visible:nth-child(8) { animation-delay: 0.56s; }
.fade-in.is-visible:nth-child(9) { animation-delay: 0.64s; }

/* --- Hero --- */
@keyframes heroFadeUp {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hero {
  padding-top: calc(var(--nav-height) + 80px);
  padding-bottom: 80px;
  min-height: 70vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, rgba(37,99,235,0.03) 0%, transparent 50%, rgba(37,99,235,0.02) 100%);
}

.hero__content {
  max-width: 720px;
}

.hero__label {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
  opacity: 0;
  animation: heroFadeUp 0.7s ease forwards 0.1s;
}

.hero__name {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--color-text) 0%, #334155 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  opacity: 0;
  animation: heroFadeUp 0.7s ease forwards 0.25s;
}

.hero__tagline {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 36px;
  max-width: 600px;
  opacity: 0;
  animation: heroFadeUp 0.7s ease forwards 0.4s;
}

.hero__cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  opacity: 0;
  animation: heroFadeUp 0.7s ease forwards 0.55s;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(37,99,235,0.25);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
  box-shadow: 0 4px 16px rgba(37,99,235,0.35);
  transform: translateY(-1px);
}

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}

.btn--outline:hover {
  border-color: var(--color-text);
  color: var(--color-text);
}

/* --- Services --- */
.services__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.services__grid--featured {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 24px;
}

.service-card {
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-card-bg);
  transition: all 0.3s ease;
}

.service-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.service-card--featured {
  border: 1.5px solid var(--color-accent);
  padding: 32px;
  background: linear-gradient(135deg, rgba(37,99,235,0.02) 0%, var(--color-card-bg) 100%);
}

.service-card--featured:hover {
  box-shadow: 0 8px 24px rgba(37,99,235,0.12);
  transform: translateY(-4px);
}

.service-card--featured .service-card__icon {
  color: var(--color-accent);
}

.service-card--featured .service-card__title {
  font-size: 1.15rem;
  font-weight: 700;
}

.service-card__icon {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.service-card__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.service-card__desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* --- Training Catalog --- */
.training__grid {
  display: grid;
  gap: 24px;
}

.training-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-card-bg);
  overflow: hidden;
  transition: box-shadow var(--transition);
}

.training-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.training-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 28px;
  cursor: pointer;
  gap: 16px;
}

.training-card__info {
  flex: 1;
}

.training-card__title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.3;
}

.training-card__meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 600;
}

.badge--duration {
  background: #e0e7ff;
  color: #3730a3;
}

.badge--udemy {
  background: #fef3c7;
  color: #92400e;
}

.training-card__toggle {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1.5px solid var(--color-border);
  background: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  margin-top: 4px;
}

.training-card__toggle svg {
  width: 16px;
  height: 16px;
  transition: transform 0.3s ease;
}

.training-card.is-open .training-card__toggle svg {
  transform: rotate(180deg);
}

.training-card__toggle:hover {
  background: var(--color-bg-alt);
}

.training-card__body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.training-card.is-open .training-card__body {
  max-height: 1200px;
}

.training-card__outline {
  padding: 0 28px 28px;
  border-top: 1px solid var(--color-border);
}

.training-card__summary {
  margin-top: 20px;
  padding: 14px 16px;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  font-size: 0.93rem;
  color: var(--color-text);
  line-height: 1.6;
  font-weight: 500;
}

.training-card__outline h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-top: 20px;
  margin-bottom: 8px;
  color: var(--color-text);
}

.training-card__outline ul {
  list-style: none;
  padding-left: 0;
}

.training-card__outline li {
  position: relative;
  padding-left: 20px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

.training-card__outline li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  opacity: 0.5;
}

.training-card__outline .outline-note {
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* --- Credentials Bar --- */
.credentials {
  padding: 48px 0;
  position: relative;
  border-top: 2px solid transparent;
  border-bottom: 1px solid var(--color-border);
  border-image: linear-gradient(90deg, transparent, var(--color-accent), transparent) 1;
  border-image-slice: 1 0 0 0;
}

.credentials__grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 40px;
  text-align: center;
}

.credential {
  flex: 0 0 auto;
}

.credential__number {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.credential__label {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

.credential__link {
  text-decoration: none;
  color: inherit;
}

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

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

.credential__link .credential__label::after {
  content: ' \2197';
  font-size: 0.7em;
  opacity: 0.35;
  vertical-align: super;
}

.credential__link:hover .credential__label::after {
  opacity: 0.7;
}

/* --- References / Logos --- */
@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.logos__marquee {
  overflow: hidden;
  padding: 32px 0;
  mask-image: linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
}

.logos__track {
  display: flex;
  align-items: center;
  gap: 72px;
  width: max-content;
  animation: marquee 30s linear infinite;
}

.logos__marquee:hover .logos__track {
  animation-play-state: paused;
}

.logo-item {
  height: 40px;
  width: auto;
  opacity: 0.5;
  filter: grayscale(100%);
  transition: all var(--transition);
  flex-shrink: 0;
}

.logo-item:hover {
  opacity: 1;
  filter: grayscale(0%);
}

/* --- Testimonials --- */
.testimonials__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.testimonial-card {
  padding: 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-card-bg);
  transition: all 0.3s ease;
}

.testimonial-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.testimonial-card__project {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.testimonial-card__stars {
  color: #f59e0b;
  font-size: 0.9rem;
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.testimonial-card__quote {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
}

.testimonial-card__author {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
}

.testimonial-card__role {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.testimonials__note {
  margin-top: 32px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* --- Footer --- */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--color-border);
}

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer__brand img {
  height: 28px;
  width: auto;
  position: relative;
  top: -4px;
}

.footer__brand span {
  font-weight: 600;
  font-size: 0.95rem;
}

.footer__info {
  text-align: right;
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.footer__info a {
  color: var(--color-text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

.footer__location {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-top: 4px;
  opacity: 0.7;
}

/* --- Mobile Nav --- */
@media (max-width: 768px) {
  .nav__links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--color-border);
  }

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

  .nav__toggle {
    display: block;
  }

  .hero {
    min-height: auto;
    padding-top: calc(var(--nav-height) + 48px);
    padding-bottom: 48px;
  }

  .hero__name {
    font-size: 2rem;
  }

  .section {
    padding: 56px 0;
  }

  .services__grid {
    grid-template-columns: 1fr;
  }

  .testimonials__grid {
    grid-template-columns: 1fr;
  }

  .credentials__grid {
    gap: 24px 32px;
  }

  .logos__grid {
    gap: 20px 28px;
  }

  .logo-item {
    height: 28px;
  }

  .footer .container {
    flex-direction: column;
    text-align: center;
  }

  .footer__info {
    text-align: center;
  }
}