/* ═══════════════════════════════════════════════
   hashblock Solutions SL — Main Stylesheet
   Dark blockchain theme, responsive
═══════════════════════════════════════════════ */

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

:root {
  --bg:         #080d1a;
  --bg-2:       #0d1528;
  --bg-3:       #121e38;
  --surface:    #0f1a2e;
  --surface-2:  #162035;
  --border:     rgba(0, 200, 255, 0.12);
  --border-2:   rgba(0, 200, 255, 0.22);

  --primary:    #00c8ff;
  --primary-d:  #0099cc;
  --accent:     #00ff9d;
  --accent-d:   #00cc7a;

  --text:       #e8edf5;
  --text-2:     #a8b4cc;
  --text-3:     #6a7d9a;

  --radius-sm:  6px;
  --radius:     12px;
  --radius-lg:  20px;

  --shadow:     0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow:0 0 40px rgba(0, 200, 255, 0.15);

  --transition: 0.25s ease;
  --ff-head:    'Space Grotesk', sans-serif;
  --ff-body:    'Inter', sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--ff-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
}

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

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

/* ── Typography ─────────────────────────────── */
h1, h2, h3, h4, h5 {
  font-family: var(--ff-head);
  line-height: 1.2;
  font-weight: 700;
  color: var(--text);
}

/* ── Utilities ──────────────────────────────── */
.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Buttons ─────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-family: var(--ff-head);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn--primary {
  background: var(--primary);
  color: var(--bg);
  border-color: var(--primary);
}
.btn--primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 200, 255, 0.3);
}

.btn--outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--border-2);
}
.btn--outline:hover {
  border-color: var(--primary);
  background: rgba(0, 200, 255, 0.08);
  transform: translateY(-2px);
}

.btn--full { width: 100%; justify-content: center; }

/* ── Section headers ─────────────────────────── */
.section__header {
  text-align: center;
  margin-bottom: 56px;
}
.section__header--left { text-align: left; }

.section__tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary);
  background: rgba(0, 200, 255, 0.1);
  border: 1px solid var(--border-2);
  padding: 6px 16px;
  border-radius: 999px;
  margin-bottom: 16px;
}

.section__title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  margin-bottom: 16px;
}

.section__subtitle {
  font-size: 1.05rem;
  color: var(--text-2);
  max-width: 580px;
  margin: 0 auto;
}

/* ═══════════════════════════════════════════════
   HEADER / NAV
═══════════════════════════════════════════════ */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(8, 13, 26, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.header.scrolled {
  background: rgba(8, 13, 26, 0.95);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 32px;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-family: var(--ff-head);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  flex-shrink: 0;
}
.nav__logo:hover { color: var(--text); }

.logo__icon {
  font-size: 1.6rem;
  color: var(--primary);
  line-height: 1;
}
.logo__accent { color: var(--primary); }

.nav__menu {
  display: flex;
  list-style: none;
  gap: 4px;
  align-items: center;
  margin: 0 auto;
}

.nav__link {
  display: block;
  padding: 8px 14px;
  color: var(--text-2);
  font-size: 0.88rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.nav__link:hover,
.nav__link.active {
  color: var(--text);
  background: rgba(0, 200, 255, 0.08);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.lang-switcher {
  background: var(--border);
  border: 1px solid var(--border-2);
  color: var(--primary);
  font-family: var(--ff-head);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 6px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: all var(--transition);
}
.lang-switcher:hover {
  background: rgba(0, 200, 255, 0.15);
  border-color: var(--primary);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
}
.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-2);
  border-radius: 2px;
  transition: all var(--transition);
}
.nav__toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.open span:nth-child(2) { opacity: 0; }
.nav__toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ═══════════════════════════════════════════════
   HERO
═══════════════════════════════════════════════ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 120px 0 80px;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

#hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 200, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 200, 255, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 40%, transparent 80%);
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 780px;
  margin: 0 auto;
}

.hero__badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(0, 255, 157, 0.08);
  border: 1px solid rgba(0, 255, 157, 0.25);
  padding: 8px 20px;
  border-radius: 999px;
  margin-bottom: 28px;
}

.hero__title {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--text-2);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero__cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.hero__stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 40px;
}
.stat__num {
  font-family: var(--ff-head);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
}
.stat__label {
  font-size: 0.8rem;
  color: var(--text-3);
  text-align: center;
  margin-top: 4px;
}
.stat__divider {
  width: 1px;
  height: 48px;
  background: var(--border-2);
}

.hero__scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
}
.scroll-indicator {
  width: 24px;
  height: 40px;
  border: 2px solid var(--border-2);
  border-radius: 12px;
  position: relative;
}
.scroll-indicator::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: var(--primary);
  border-radius: 2px;
  animation: scroll-pulse 1.8s infinite;
}
@keyframes scroll-pulse {
  0%   { top: 6px; opacity: 1; }
  100% { top: 22px; opacity: 0; }
}

/* ═══════════════════════════════════════════════
   ABOUT
═══════════════════════════════════════════════ */
.about {
  background: var(--bg-2);
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.about__lead {
  font-size: 1.15rem;
  color: var(--text);
  font-weight: 500;
  margin-bottom: 20px;
  line-height: 1.6;
}

.about__text p {
  color: var(--text-2);
  margin-bottom: 16px;
}
.about__text strong { color: var(--primary); }

.about__details {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.detail-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.detail-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
  margin-top: 2px;
}
.detail-item div {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.detail-item strong {
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
  font-weight: 600;
}
.detail-item span, .detail-item a {
  color: var(--text-2);
  font-size: 0.95rem;
}

/* Blockchain visual */
.about__visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.blockchain-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  padding: 24px;
}

.block {
  width: 220px;
  padding: 20px 24px;
  border: 1px solid var(--border-2);
  border-radius: var(--radius);
  background: var(--surface);
  position: relative;
  transition: all 0.3s ease;
}
.block:hover { border-color: var(--primary); transform: scale(1.02); }

.block--active {
  border-color: var(--accent);
  background: rgba(0, 255, 157, 0.05);
  box-shadow: 0 0 32px rgba(0, 255, 157, 0.1);
}

.block__hash {
  font-family: monospace;
  font-size: 0.75rem;
  color: var(--primary);
  margin-bottom: 6px;
}
.block--active .block__hash { color: var(--accent); }

.block__label {
  font-size: 0.85rem;
  color: var(--text-2);
  font-weight: 600;
}

.block__connector {
  width: 2px;
  height: 28px;
  background: linear-gradient(to bottom, var(--border-2), var(--border-2));
  position: relative;
}
.block__connector::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%);
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 7px solid var(--border-2);
}

/* ═══════════════════════════════════════════════
   SERVICES
═══════════════════════════════════════════════ */
.services {
  background: var(--bg);
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: opacity var(--transition);
}
.service-card:hover {
  border-color: var(--border-2);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.service-card:hover::before { opacity: 1; }

.service-card__icon {
  font-size: 2rem;
  margin-bottom: 16px;
  display: block;
}

.service-card h3 {
  font-size: 1.05rem;
  margin-bottom: 12px;
  color: var(--text);
}

.service-card p {
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.7;
}

/* ═══════════════════════════════════════════════
   EDUCATION
═══════════════════════════════════════════════ */
.education {
  background: linear-gradient(135deg, var(--bg-2) 0%, var(--bg-3) 100%);
  position: relative;
  overflow: hidden;
}
.education::before {
  content: '';
  position: absolute;
  top: -200px; right: -200px;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(0, 200, 255, 0.05), transparent 60%);
  pointer-events: none;
}

.education__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.education .section__title { margin-bottom: 20px; }

.education p {
  color: var(--text-2);
  margin-bottom: 16px;
  font-size: 0.98rem;
}

.education__pillars {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.pillar {
  padding: 24px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--transition);
}
.pillar:hover { border-color: var(--border-2); }

.pillar__num {
  font-family: var(--ff-head);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
  opacity: 0.4;
  margin-bottom: 8px;
  line-height: 1;
}

.pillar h4 {
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.pillar p {
  font-size: 0.83rem;
  color: var(--text-3);
  line-height: 1.6;
  margin: 0;
}

/* ═══════════════════════════════════════════════
   WHY US
═══════════════════════════════════════════════ */
.why {
  background: var(--bg);
}

.why__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.why-card {
  text-align: center;
  padding: 36px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: all var(--transition);
}
.why-card:hover {
  border-color: var(--border-2);
  background: var(--surface-2);
  transform: translateY(-4px);
}

.why-card__icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.why-card h4 {
  font-size: 0.95rem;
  margin-bottom: 10px;
}

.why-card p {
  font-size: 0.85rem;
  color: var(--text-3);
  line-height: 1.65;
}

/* ═══════════════════════════════════════════════
   CONTACT
═══════════════════════════════════════════════ */
.contact {
  background: var(--bg-2);
}

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 64px;
  align-items: start;
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.contact-item__icon {
  font-size: 1.3rem;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: rgba(0, 200, 255, 0.08);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-item div {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 8px;
}
.contact-item strong {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
  font-weight: 600;
}
.contact-item span, .contact-item a {
  font-size: 0.95rem;
  color: var(--text-2);
}
.contact-item a:hover { color: var(--primary); }

/* Form */
.contact__form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.form__group {
  margin-bottom: 20px;
}

.form__group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.form__group input,
.form__group select,
.form__group textarea {
  width: 100%;
  background: var(--bg-2);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--text);
  font-family: var(--ff-body);
  font-size: 0.95rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  -webkit-appearance: none;
}

.form__group select {
  cursor: pointer;
}

.form__group input:focus,
.form__group select:focus,
.form__group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 200, 255, 0.1);
}

.form__group textarea { resize: vertical; min-height: 120px; }

.form__group input::placeholder,
.form__group textarea::placeholder {
  color: var(--text-3);
}

.form__group select option {
  background: var(--bg-2);
  color: var(--text);
}

.form__checkbox {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.form__checkbox input[type="checkbox"] {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 1px;
  accent-color: var(--primary);
  cursor: pointer;
}
.form__checkbox label {
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.85rem;
  color: var(--text-3);
  font-weight: 400;
  margin: 0;
  cursor: pointer;
}
.form__checkbox label a { color: var(--primary); }

.form__feedback {
  margin-top: 16px;
  font-size: 0.9rem;
  min-height: 24px;
  border-radius: var(--radius-sm);
  padding: 0;
  transition: all var(--transition);
}
.form__feedback.success {
  color: var(--accent);
  background: rgba(0, 255, 157, 0.08);
  border: 1px solid rgba(0, 255, 157, 0.25);
  padding: 12px 16px;
}
.form__feedback.error {
  color: #ff6b6b;
  background: rgba(255, 107, 107, 0.08);
  border: 1px solid rgba(255, 107, 107, 0.25);
  padding: 12px 16px;
}

/* ═══════════════════════════════════════════════
   FOOTER
═══════════════════════════════════════════════ */
.footer {
  background: var(--bg-3);
  border-top: 1px solid var(--border);
}

.footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 2fr;
  gap: 48px;
  padding: 64px 24px 48px;
}

.footer__brand .nav__logo {
  font-size: 1rem;
  margin-bottom: 14px;
  display: inline-flex;
}

.footer__brand p {
  font-size: 0.87rem;
  color: var(--text-3);
  max-width: 260px;
  line-height: 1.6;
}

.footer__links h5 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
  margin-bottom: 16px;
}
.footer__links ul { list-style: none; }
.footer__links ul li { margin-bottom: 10px; }
.footer__links ul li a {
  font-size: 0.88rem;
  color: var(--text-2);
  transition: color var(--transition);
}
.footer__links ul li a:hover { color: var(--primary); }

.footer__legal-block {
  font-size: 0.85rem;
  color: var(--text-3);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.footer__legal-block a { color: var(--primary); }

.footer__bottom {
  border-top: 1px solid var(--border);
  padding: 20px 24px;
}
.footer__bottom .container {
  display: flex;
  justify-content: center;
  font-size: 0.82rem;
  color: var(--text-3);
}

/* ═══════════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════════ */
@media (max-width: 1024px) {
  .services__grid { grid-template-columns: repeat(2, 1fr); }
  .why__grid { grid-template-columns: repeat(2, 1fr); }
  .footer__inner { grid-template-columns: 1fr 1fr; }
  .about__grid { gap: 40px; }
}

@media (max-width: 768px) {
  .section { padding: 72px 0; }

  /* Nav */
  .nav__menu {
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: rgba(8, 13, 26, 0.97);
    flex-direction: column;
    padding: 24px;
    gap: 8px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    transition: transform 0.3s ease;
    z-index: 999;
  }
  .nav__menu.open { transform: translateY(0); }
  .nav__link { width: 100%; padding: 12px 16px; font-size: 0.95rem; }
  .nav__toggle { display: flex; }

  /* About */
  .about__grid { grid-template-columns: 1fr; gap: 48px; }
  .about__visual { order: -1; }

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

  /* Education */
  .education__inner { grid-template-columns: 1fr; gap: 40px; }
  .education__pillars { grid-template-columns: 1fr; }

  /* Why */
  .why__grid { grid-template-columns: 1fr 1fr; }

  /* Contact */
  .contact__grid { grid-template-columns: 1fr; gap: 40px; }
  .contact__form { padding: 28px 20px; }

  /* Footer */
  .footer__inner { grid-template-columns: 1fr; gap: 32px; padding: 48px 24px 32px; }

  /* Hero stats */
  .hero__stats { flex-direction: column; gap: 16px; }
  .stat__divider { width: 60px; height: 1px; }
}

@media (max-width: 480px) {
  .hero__title { font-size: 2.2rem; }
  .hero__cta { flex-direction: column; align-items: center; }
  .why__grid { grid-template-columns: 1fr; }
  .stat { padding: 0 20px; }
  .block { width: 180px; }
}

/* ═══════════════════════════════════════════════
   ANIMATIONS
═══════════════════════════════════════════════ */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.services__grid .service-card:nth-child(2) { transition-delay: 0.1s; }
.services__grid .service-card:nth-child(3) { transition-delay: 0.2s; }
.services__grid .service-card:nth-child(4) { transition-delay: 0.1s; }
.services__grid .service-card:nth-child(5) { transition-delay: 0.2s; }
.services__grid .service-card:nth-child(6) { transition-delay: 0.3s; }

/* Pulse animation for active block */
@keyframes glow-pulse {
  0%, 100% { box-shadow: 0 0 20px rgba(0, 255, 157, 0.1); }
  50%       { box-shadow: 0 0 40px rgba(0, 255, 157, 0.25); }
}
.block--active { animation: glow-pulse 3s ease-in-out infinite; }