/* =====================================================
   VYUD Design System — site.css (investor edition)
   Primary: #0D7EFF · Dark BG: #0D1926
   Display: Syne ExtraBold · Body: DM Sans · Mono: JetBrains Mono
   ===================================================== */

:root {
  --c-bg: #0D1926;
  --c-bg-2: #0F1E30;
  --c-bg-3: #15263A;
  --c-text: #E6EEF7;
  --c-text-dim: #9AAEC2;
  --c-text-mute: #6B7E92;
  --c-primary: #0D7EFF;
  --c-primary-hover: #2A92FF;
  --c-primary-soft: rgba(13, 126, 255, 0.12);
  --c-success: #10B981;
  --c-warning: #F59E0B;
  --c-border: rgba(255, 255, 255, 0.08);
  --c-border-strong: rgba(255, 255, 255, 0.16);

  --f-display: 'Syne', system-ui, sans-serif;
  --f-body: 'DM Sans', system-ui, sans-serif;
  --f-mono: 'JetBrains Mono', ui-monospace, monospace;

  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-xl: 28px;

  --shadow-glow: 0 20px 60px -20px rgba(13, 126, 255, 0.45);
}

/* ============== RESET ============== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--f-body);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; }
em { font-style: italic; color: var(--c-primary); }
.link { color: var(--c-primary); text-decoration: underline; text-underline-offset: 3px; }
.link:hover { color: var(--c-primary-hover); }

/* ============== LAYOUT ============== */
.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}
.section {
  padding: 96px 0;
  position: relative;
}
.section--alt {
  background: linear-gradient(180deg, var(--c-bg) 0%, var(--c-bg-2) 100%);
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}
.section--cta {
  padding: 120px 0;
  background: radial-gradient(circle at 50% 0%, var(--c-primary-soft) 0%, transparent 60%);
}

.section__head {
  margin-bottom: 56px;
  max-width: 760px;
}
.section__kicker {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-primary);
  margin-bottom: 12px;
}
.section__title {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(28px, 4.5vw, 48px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 16px 0;
}
.section__lead {
  color: var(--c-text-dim);
  font-size: 18px;
  margin: 0;
}

/* ============== NAV ============== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 25, 38, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand__mark {
  position: relative;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--c-bg-3);
  border: 1px solid var(--c-border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--f-display);
  font-weight: 800;
}
.brand__v { font-size: 18px; color: var(--c-text); }
.brand__dot {
  position: absolute;
  top: -3px;
  right: -3px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-primary);
  box-shadow: 0 0 12px rgba(13, 126, 255, 0.8);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.brand__name {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 15px;
}
.brand__sub { font-size: 12px; color: var(--c-text-mute); }
.nav__links {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav__links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text-dim);
  transition: color 0.2s;
}
.nav__links a:hover { color: var(--c-text); }
.nav__cta {
  background: var(--c-primary);
  color: #fff !important;
  padding: 10px 18px;
  border-radius: var(--r-sm);
  transition: background 0.2s, transform 0.2s;
}
.nav__cta:hover {
  background: var(--c-primary-hover);
  transform: translateY(-1px);
}
.nav__burger {
  display: none;
  background: none;
  border: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}
.nav__burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
}

/* ============== HERO ============== */
.hero {
  position: relative;
  padding: 120px 0 96px;
  overflow: hidden;
}
.hero__inner {
  position: relative;
  z-index: 2;
  max-width: 920px;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--c-text-dim);
  background: var(--c-bg-3);
  border: 1px solid var(--c-border-strong);
  padding: 8px 16px;
  border-radius: 999px;
  margin-bottom: 32px;
}
.hero__badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-success);
  box-shadow: 0 0 10px var(--c-success);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero__title {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(40px, 7vw, 80px);
  line-height: 1;
  letter-spacing: -0.03em;
  margin: 0 0 24px 0;
}
.hero__title--accent {
  background: linear-gradient(135deg, var(--c-primary) 0%, #5BA8FF 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero__subtitle {
  font-size: clamp(16px, 1.5vw, 19px);
  color: var(--c-text-dim);
  max-width: 720px;
  margin: 0 0 36px 0;
}
.hero__subtitle strong { color: var(--c-text); font-weight: 600; }

.hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 24px 0;
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}
.stat__value {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(24px, 3vw, 36px);
  color: var(--c-text);
  line-height: 1;
  margin-bottom: 6px;
}
.stat__label {
  font-size: 13px;
  color: var(--c-text-mute);
}

.hero__glow {
  position: absolute;
  top: -200px;
  right: -200px;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, var(--c-primary-soft) 0%, transparent 60%);
  z-index: 1;
  pointer-events: none;
}

/* ============== BUTTONS ============== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--r-sm);
  font-family: var(--f-body);
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  transition: all 0.2s ease;
  white-space: nowrap;
}
.btn--primary {
  background: var(--c-primary);
  color: #fff;
}
.btn--primary:hover {
  background: var(--c-primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}
.btn--ghost {
  background: transparent;
  color: var(--c-text);
  border-color: var(--c-border-strong);
}
.btn--ghost:hover {
  background: var(--c-bg-3);
  border-color: var(--c-primary);
}
.btn--lg { padding: 16px 32px; font-size: 16px; }
.btn--xl { padding: 20px 40px; font-size: 18px; }

/* ============== VISION ============== */
.vision {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.vision__card {
  padding: 32px;
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  transition: all 0.3s ease;
}
.vision__card--accent {
  background: linear-gradient(160deg, var(--c-primary-soft) 0%, var(--c-bg-2) 80%);
  border-color: rgba(13, 126, 255, 0.35);
}
.vision__card:hover {
  transform: translateY(-2px);
  border-color: var(--c-border-strong);
}
.vision__num {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--c-primary);
  margin-bottom: 16px;
  letter-spacing: 0.1em;
}
.vision__title {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 24px;
  margin: 0 0 12px 0;
}
.vision__card p {
  margin: 0;
  color: var(--c-text-dim);
  font-size: 16px;
}
.vision__card strong { color: var(--c-text); font-weight: 600; }

/* ============== TRACTION ============== */
.traction {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 64px;
}
.traction__metric {
  padding: 28px;
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  transition: transform 0.2s;
}
.traction__metric:hover { transform: translateY(-4px); }
.traction__number {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 56px;
  line-height: 1;
  color: var(--c-primary);
  margin-bottom: 12px;
  letter-spacing: -0.03em;
}
.traction__label {
  font-weight: 600;
  font-size: 15px;
  margin-bottom: 8px;
  color: var(--c-text);
}
.traction__detail {
  font-size: 13px;
  color: var(--c-text-mute);
  line-height: 1.5;
}
.traction__detail a { color: var(--c-primary); }

.traction__milestones {
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 36px;
}
.traction__h3 {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 22px;
  margin: 0 0 24px 0;
}
.traction__milestones ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.traction__milestones li {
  padding: 14px 0;
  border-bottom: 1px dashed var(--c-border);
  color: var(--c-text-dim);
  font-size: 15px;
  display: flex;
  align-items: baseline;
  gap: 16px;
}
.traction__milestones li:last-child { border-bottom: none; }
.traction__milestones strong { color: var(--c-text); }
.ms__date {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--c-primary);
  font-weight: 600;
  flex-shrink: 0;
  width: 80px;
}

/* ============== PRODUCTS ============== */
.products {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.product {
  padding: 32px;
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}
.product:hover {
  transform: translateY(-4px);
  border-color: var(--c-border-strong);
  background: var(--c-bg-3);
}
.product__icon {
  width: 56px;
  height: 56px;
  border-radius: var(--r-md);
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  color: var(--accent);
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.product__name {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 22px;
  margin: 0 0 12px 0;
}
.product__desc {
  color: var(--c-text-dim);
  font-size: 15px;
  margin: 0 0 20px 0;
  flex-grow: 1;
}
.product__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
}
.product__tag {
  font-size: 12px;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: 999px;
  letter-spacing: 0.02em;
}
.product__tag--live {
  color: var(--c-success);
  background: rgba(16, 185, 129, 0.12);
}
.product__tag--dev {
  color: var(--c-warning);
  background: rgba(245, 158, 11, 0.12);
}
.product__tag--pilot {
  color: var(--c-primary);
  background: rgba(13, 126, 255, 0.12);
}
.product__url {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--c-text-mute);
}

/* ============== ABOUT ============== */
.about {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-bottom: 80px;
}
.about__col p {
  font-size: 16px;
  color: var(--c-text-dim);
  margin: 0 0 20px 0;
}
.about__col strong {
  color: var(--c-text);
  font-weight: 600;
}

/* ============== TIMELINE ============== */
.timeline {
  position: relative;
  padding-left: 32px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--c-border-strong);
}
.timeline__item {
  position: relative;
  padding-bottom: 32px;
}
.timeline__item:last-child { padding-bottom: 0; }
.timeline__item::before {
  content: '';
  position: absolute;
  left: -32px;
  top: 8px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--c-bg-2);
  border: 2px solid var(--c-primary);
  box-shadow: 0 0 0 4px rgba(13, 126, 255, 0.15);
}
.timeline__period {
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--c-primary);
  margin-bottom: 6px;
  letter-spacing: 0.05em;
}
.timeline__role {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 19px;
  margin: 0 0 4px 0;
  color: var(--c-text);
}
.timeline__org {
  font-size: 14px;
  color: var(--c-text-mute);
  margin: 0;
}

/* ============== REPOS ============== */
.repos {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}
.repo {
  padding: 24px;
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  display: flex;
  flex-direction: column;
  transition: all 0.2s ease;
  cursor: pointer;
}
.repo:hover {
  border-color: var(--c-primary);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px -8px rgba(13, 126, 255, 0.3);
}
.repo__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}
.repo__icon { font-size: 22px; }
.repo__lang {
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--c-primary);
  background: var(--c-primary-soft);
  padding: 4px 10px;
  border-radius: 999px;
  letter-spacing: 0.05em;
}
.repo__name {
  font-family: var(--f-mono);
  font-weight: 600;
  font-size: 16px;
  color: var(--c-text);
  margin: 0 0 8px 0;
}
.repo__desc {
  color: var(--c-text-dim);
  font-size: 14px;
  margin: 0 0 16px 0;
  flex-grow: 1;
  line-height: 1.5;
}
.repo__link {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--c-primary);
}
.repos__cta {
  text-align: center;
  margin-bottom: 80px;
}

/* ============== STACK ============== */
.stack {
  padding-top: 48px;
  border-top: 1px solid var(--c-border);
}
.stack__title {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 24px;
  margin: 0 0 32px 0;
}
.stack__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.stack__col {
  padding: 24px;
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
}
.stack__cat {
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--c-primary);
  letter-spacing: 0.1em;
  margin-bottom: 12px;
  text-transform: uppercase;
}
.stack__col p {
  margin: 0;
  font-size: 14px;
  color: var(--c-text-dim);
  line-height: 1.6;
}

/* ============== CTA ============== */
.cta {
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}
.cta__title {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: clamp(40px, 6vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 16px 0 20px 0;
}
.cta__subtitle {
  font-size: 19px;
  color: var(--c-text-dim);
  margin: 0 0 40px 0;
}
.cta__list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 48px auto 24px;
  max-width: 460px;
  text-align: left;
}
.cta__item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 20px;
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  font-size: 15px;
  color: var(--c-text-dim);
}
.cta__bullet {
  color: var(--c-primary);
  font-weight: 700;
  flex-shrink: 0;
}
.cta__hint {
  font-size: 14px;
  color: var(--c-text-mute);
  margin-top: 24px;
  font-style: italic;
}

/* ============== FOOTER ============== */
.footer {
  border-top: 1px solid var(--c-border);
  padding: 32px 0;
}
.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.footer__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: var(--c-text-mute);
}
.footer__links { display: flex; gap: 24px; }
.footer__links a {
  font-size: 14px;
  color: var(--c-text-dim);
  transition: color 0.2s;
}
.footer__links a:hover { color: var(--c-primary); }

/* ============== LANGUAGE SWITCH ============== */
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--c-bg-3);
  border: 1px solid var(--c-border-strong);
  border-radius: 999px;
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
}
.lang-switch__btn {
  background: transparent;
  border: none;
  color: var(--c-text-mute);
  padding: 2px 6px;
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  letter-spacing: inherit;
  transition: color 0.15s ease;
}
.lang-switch__btn:hover { color: var(--c-text); }
.lang-switch__btn[aria-pressed="true"] {
  color: var(--c-primary);
}
.lang-switch__sep {
  color: var(--c-text-mute);
  opacity: 0.5;
}

/* ============== SOCIAL / BLOG CARDS ============== */
.socials {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.social {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 24px;
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}
.social::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--social-color, var(--c-primary)) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}
.social:hover {
  transform: translateY(-3px);
  border-color: var(--social-color, var(--c-primary));
  box-shadow: 0 12px 30px -10px rgba(0, 0, 0, 0.4);
}
.social:hover::before { opacity: 0.08; }

.social__icon {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  border-radius: var(--r-md);
  background: color-mix(in srgb, var(--social-color, var(--c-primary)) 15%, transparent);
  border: 1px solid color-mix(in srgb, var(--social-color, var(--c-primary)) 30%, transparent);
  color: var(--social-color, var(--c-primary));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
}
.social__body {
  flex: 1;
  min-width: 0;
  position: relative;
  z-index: 1;
}
.social__name {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--c-text);
  margin-bottom: 2px;
}
.social__handle {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--social-color, var(--c-primary));
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}
.social__desc {
  font-size: 14px;
  color: var(--c-text-dim);
  line-height: 1.5;
  margin: 0;
}
.social__arrow {
  flex-shrink: 0;
  font-size: 22px;
  color: var(--c-text-mute);
  transition: transform 0.25s ease, color 0.25s ease;
  position: relative;
  z-index: 1;
}
.social:hover .social__arrow {
  transform: translateX(4px);
  color: var(--social-color, var(--c-primary));
}

/* Brand colors per platform */
.social--linkedin { --social-color: #0A66C2; }
.social--telegram { --social-color: #229ED9; }
.social--medium   { --social-color: #FFFFFF; }
.social--github   { --social-color: #9AAEC2; }

/* ============== RESPONSIVE ============== */
@media (max-width: 900px) {
  .nav__links { display: none; }
  .nav__links.open {
    display: flex;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--c-bg-2);
    border-bottom: 1px solid var(--c-border);
    padding: 24px;
    gap: 20px;
  }
  .nav__burger { display: flex; }

  .section { padding: 64px 0; }
  .hero { padding: 64px 0; }
  .hero__stats { grid-template-columns: repeat(2, 1fr); gap: 16px; }

  .vision { grid-template-columns: 1fr; }
  .traction { grid-template-columns: repeat(2, 1fr); }
  .products { grid-template-columns: 1fr; }
  .about { grid-template-columns: 1fr; gap: 24px; }
  .repos { grid-template-columns: 1fr; }
  .stack__grid { grid-template-columns: 1fr; }
  .socials { grid-template-columns: 1fr; }

  /* Lang switch full-visible inside open mobile menu */
  .lang-switch { align-self: flex-start; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .brand__sub { display: none; }
  .hero__actions { flex-direction: column; align-items: stretch; }
  .hero__actions .btn { width: 100%; }
  .traction { grid-template-columns: 1fr; }
  .traction__milestones li { flex-direction: column; gap: 4px; }
  .ms__date { width: auto; }
  .footer__inner { flex-direction: column; text-align: center; }

  /* Social cards: vertical stack on tiny screens */
  .social {
    flex-wrap: wrap;
    gap: 16px;
  }
  .social__arrow { display: none; }
}