:root {
  --bg: #0f1220;
  --card: #181d30;
  --text: #e9edf7;
  --muted: #b7bfd5;
  --accent: #3ddc97;
  --accent-dark: #2fc180;
  --danger: #ff6b6b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: radial-gradient(circle at top, #1d2440, var(--bg) 45%);
  color: var(--text);
  line-height: 1.6;
}

.container {
  width: min(1060px, 92%);
  margin: 0 auto;
}

header {
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  position: sticky;
  top: 0;
  backdrop-filter: blur(8px);
  background: rgba(15, 18, 32, 0.82);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

.brand {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.2px;
}

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

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
}

.main-nav {
  display: flex;
  align-items: center;
}

.main-nav a {
  color: var(--text);
  text-decoration: none;
  margin-left: 18px;
  opacity: 0.9;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--accent);
  opacity: 1;
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 10px;
  background: #151b30;
  padding: 9px 8px;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  border-radius: 999px;
  background: var(--text);
  margin: 4px 0;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

main {
  padding: 34px 0 50px;
}

.hero {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 26px;
  align-items: center;
}

.hero h1 {
  margin-top: 0;
  margin-bottom: 10px;
  line-height: 1.25;
  font-size: clamp(1.8rem, 3.2vw, 2.5rem);
}

.hero p {
  color: var(--muted);
}

.hero img {
  width: 100%;
  border-radius: 14px;
  display: block;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.card-grid {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.card {
  background: var(--card);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 16px;
}

.card h3 {
  margin-top: 0;
  margin-bottom: 8px;
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.page-title {
  margin-top: 0;
  margin-bottom: 14px;
}

.content {
  background: var(--card);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 22px;
}

.content h2 {
  margin-top: 18px;
}

.content h2:first-child {
  margin-top: 0;
}

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

form {
  display: grid;
  gap: 12px;
}

label {
  font-weight: 600;
}

input,
textarea {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: #12172a;
  color: var(--text);
  border-radius: 10px;
  padding: 11px 12px;
  font: inherit;
}

textarea {
  min-height: 130px;
  resize: vertical;
}

.checkbox {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: var(--muted);
  font-size: 0.95rem;
}

.checkbox input {
  width: auto;
  margin-top: 3px;
}

button {
  border: none;
  background: var(--accent);
  color: #092112;
  padding: 12px 16px;
  border-radius: 10px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  background: var(--accent-dark);
}

.form-message {
  margin: 6px 0 0;
  min-height: 1.3em;
}

.form-message.error {
  color: var(--danger);
}

.form-message.success {
  color: var(--accent);
}

footer {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 18px 0 26px;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .menu-toggle {
    display: block;
  }

  .main-nav {
    position: fixed;
    top: 71px;
    right: 0;
    z-index: 20;
    width: min(84vw, 320px);
    height: calc(100dvh - 71px);
    background: rgba(11, 15, 28, 0.97);
    border-left: 1px solid rgba(255, 255, 255, 0.08);
    transform: translateX(105%);
    transition: transform 0.24s ease;
    padding: 22px 18px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }

  .main-nav a {
    margin-left: 0;
    padding: 10px 12px;
    border-radius: 10px;
  }

  .main-nav a:hover,
  .main-nav a.active {
    background: rgba(61, 220, 151, 0.16);
  }

  .main-nav.is-open {
    transform: translateX(0);
  }

  body.menu-open {
    overflow: hidden;
  }
}