:root {
  --bg: #111111;
  --panel: #181818;
  --text: #f7f4ee;
  --muted: #c7c2b8;
  --gold: #d4a017;
  --gold-soft: rgba(212, 160, 23, 0.16);
  --border: rgba(255,255,255,0.1);
  --max: 1040px;
  --radius: 24px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding-top: 74px;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.container {
  width: min(var(--max), calc(100% - 48px));
  margin: 0 auto;
}

/* =========================
   Header
========================= */

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  transition: background 0.25s ease, backdrop-filter 0.25s ease, box-shadow 0.25s ease;
}

.topbar.is-scrolled {
  background: rgba(10, 14, 18, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.24);
}

.nav {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  white-space: nowrap;
  min-width: 0;
  flex: 1 1 auto;
}

.brand-logo {
  height: 34px;
  width: auto;
  object-fit: contain;
  flex-shrink: 0;
}

.brand-wordmark span {
  color: var(--gold);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-left: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 0.95rem;
}

.nav-links a {
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: #fff;
}

.lang-switch {
  display: flex;
  gap: 8px;
  align-items: center;
}

.lang-switch a {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--muted);
  background: rgba(255,255,255,0.03);
  transition: 0.2s ease;
}

.lang-switch a.active {
  color: #111;
  background: var(--gold);
  border-color: var(--gold);
  font-weight: 700;
}

/* Header AI button */
.ai-link {
  color: #f3d98e;
  font-weight: 700;
}

/* =========================
   Mobile menu button
========================= */

.menu-toggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 0;
  margin-left: auto;
  flex-shrink: 0;
}

.menu-toggle span {
  position: absolute;
  left: 10px;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 999px;
  transition: transform 0.25s ease, opacity 0.2s ease, top 0.25s ease;
}

.menu-toggle span:nth-child(1) {
  top: 14px;
}

.menu-toggle span:nth-child(2) {
  top: 21px;
}

.menu-toggle span:nth-child(3) {
  top: 28px;
}

.menu-toggle.is-open span:nth-child(1) {
  top: 21px;
  transform: rotate(45deg);
}

.menu-toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.is-open span:nth-child(3) {
  top: 21px;
  transform: rotate(-45deg);
}

/* =========================
   Shared buttons
========================= */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 18px;
  padding: 14px 22px;
  font-weight: 700;
  transition: 0.2s ease;
  border: 1px solid transparent;
  font-size: 1rem;
}

.btn-primary {
  background: var(--gold);
  color: #111;
}

.btn-primary:hover {
  transform: translateY(-1px);
}

.btn-secondary {
  border-color: rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.06);
  color: var(--text);
  backdrop-filter: blur(4px);
}

/* =========================
   Footer
========================= */

.footer {
  border-top: 1px solid var(--border);
  padding: 34px 0 48px;
  color: var(--muted);
  background: #0b0b0b;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 24px;
}

.contact-links a {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  transition: 0.2s;
}

.contact-links a:hover {
  color: #fff;
  transform: translateX(4px);
}

/* =========================
   Shared content helpers
========================= */

.section {
  padding: 84px 0;
}

.section-header {
  max-width: 860px;
  margin: 0 auto 42px;
  text-align: center;
}

.section-header h2 {
  margin: 0;
  font-size: clamp(1.85rem, 3vw, 2.7rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.section-header p {
  margin: 16px auto 0;
  color: var(--muted);
  max-width: 920px;
  font-size: 1.03rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

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

.panel-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 24px;
}

.panel-box h3 {
  margin: 0 0 10px;
  font-size: 1.2rem;
}

.panel-box p,
.panel-box li {
  color: var(--muted);
}

/* =========================
   Responsive shared
========================= */

@media (max-width: 980px) {
  .grid-2,
  .grid-3,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  body {
    padding-top: 74px;
  }
}

/* =========================
   Mobile header/menu
========================= */

@media (max-width: 900px) {
  .nav {
    min-height: 74px;
    gap: 12px;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 0;
  }

  .brand {
    flex: 1 1 auto;
    min-width: 0;
  }

  .brand-logo {
    height: 28px;
  }

  .brand-wordmark {
    font-size: 1rem;
  }

  .menu-toggle {
    display: block;
    z-index: 1102;
  }

  .nav-right {
    position: absolute;
    top: calc(100% + 10px);
    left: 12px;
    right: 12px;
    margin-left: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 18px;
    padding: 22px 20px 20px;
    background: rgba(30, 25, 22, 0.98);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 24px;
    box-shadow: 0 24px 60px rgba(0,0,0,0.42);
    z-index: 1101;
  }

  .nav-right.open {
    display: flex;
  }

  .nav-links {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    flex-wrap: nowrap;
  }

  .nav-links a {
    font-size: 1.18rem;
    line-height: 1.3;
  }

  .lang-switch {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding-top: 16px;
    border-top: 1px solid rgba(255,255,255,0.08);
  }

  .lang-switch a {
    padding: 10px 14px;
    font-size: 0.96rem;
  }
}