:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-muted: #f1f5f9;
  --text: #122033;
  --text-muted: #4b5b70;
  --primary: #0f6bff;
  --primary-dark: #0a4ec0;
  --success: #0f9f6e;
  --warning: #e59f00;
  --danger: #d63939;
  --border: #d9e2ec;
  --shadow: 0 10px 30px rgba(15, 30, 60, 0.08);
  --radius: 14px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  width: min(1100px, 92vw);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--primary);
  color: #fff;
  padding: 0.5rem 0.75rem;
  border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; z-index: 1000; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(246, 248, 251, 0.95);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
}

.nav {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 700;
}
.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: linear-gradient(145deg, #0f6bff, #3ea3ff);
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 0.95rem;
  font-weight: 800;
}

.vestel-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.25rem 0.6rem;
  border: 1px solid #8ab7ff;
  border-radius: 999px;
  font-size: 0.8rem;
  color: #0e4cb0;
  background: #eaf2ff;
}

.desktop-nav {
  display: none;
  gap: 0.2rem;
  flex-wrap: wrap;
}
.desktop-nav a {
  padding: 0.5rem 0.7rem;
  border-radius: 8px;
  color: var(--text-muted);
  font-size: 0.92rem;
}
.desktop-nav a:hover,
.desktop-nav a[aria-current="page"] {
  background: #eaf2ff;
  color: #0e4cb0;
}

.menu-btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 10px;
  padding: 0.5rem 0.65rem;
  font-size: 0.92rem;
}

.mobile-drawer {
  position: fixed;
  inset: 0;
  background: rgba(9, 18, 33, 0.45);
  opacity: 0;
  visibility: hidden;
  transition: 0.2s;
}
.mobile-drawer.open {
  opacity: 1;
  visibility: visible;
}
.drawer-panel {
  width: min(320px, 85vw);
  height: 100%;
  background: var(--surface);
  padding: 1rem;
  transform: translateX(-100%);
  transition: 0.25s;
  overflow-y: auto;
}
.mobile-drawer.open .drawer-panel { transform: translateX(0); }
.drawer-links { display: grid; gap: 0.35rem; margin-top: 0.7rem; }
.drawer-links a {
  padding: 0.65rem 0.7rem;
  border-radius: 10px;
  border: 1px solid var(--border);
}

.hero {
  padding: 2.2rem 0 1.6rem;
}
.hero-card {
  background: linear-gradient(150deg, #ffffff 0%, #eaf2ff 100%);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: 20px;
  padding: 1.35rem;
}
.hero h1 { font-size: clamp(1.6rem, 4.5vw, 2.5rem); line-height: 1.2; margin-bottom: 0.7rem; }
.hero p { color: var(--text-muted); }
.cta-row { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1rem; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.72rem 1rem;
  border-radius: 10px;
  border: 1px solid transparent;
  font-weight: 600;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: var(--surface); border-color: var(--border); }

.section { padding: 1.7rem 0; }
.section h2 { font-size: clamp(1.3rem, 3vw, 1.85rem); margin-bottom: 0.4rem; }
.section-intro { color: var(--text-muted); margin-bottom: 1rem; }

.grid {
  display: grid;
  gap: 0.85rem;
}
.grid.cards { grid-template-columns: 1fr; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: 0 6px 16px rgba(20, 40, 80, 0.05);
}
.card h3 { margin-top: 0; margin-bottom: 0.35rem; font-size: 1.04rem; }
.card p, .card li { color: var(--text-muted); }

.card.status-red { border-left: 6px solid var(--danger); }
.card.status-yellow { border-left: 6px solid var(--warning); }
.card.status-blue { border-left: 6px solid #1877f2; }
.card.status-neutral { border-left: 6px solid #6c7b8a; }

.notice {
  background: #fff8e8;
  border: 1px solid #f3dc9e;
  color: #6b4f00;
  padding: 0.95rem;
  border-radius: 12px;
}
.notice.strong {
  background: #fff1f1;
  border-color: #f5b7b7;
  color: #7a1d1d;
}

.list-clean { margin: 0.2rem 0 0; padding-left: 1.1rem; }
.list-clean li { margin: 0.3rem 0; }

.table-like {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
}
.compare-card { border: 1px solid var(--border); border-radius: 12px; padding: 1rem; background: var(--surface); }
.compare-card h3 { margin-top: 0; }

.copy-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
  margin-top: 0.4rem;
}
.code-pill {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  background: var(--surface-muted);
  border-radius: 8px;
  padding: 0.32rem 0.55rem;
  border: 1px solid var(--border);
}
.copy-btn { border: 1px solid var(--border); background: #fff; border-radius: 8px; padding: 0.35rem 0.6rem; }

.accordion details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.8rem 0.9rem;
}
.accordion details + details { margin-top: 0.55rem; }
.accordion summary {
  cursor: pointer;
  font-weight: 600;
}
.accordion p { margin: 0.55rem 0 0; color: var(--text-muted); }

.pricing-card {
  border: 2px solid #90b9ff;
  border-radius: 16px;
  background: #fff;
  padding: 1.2rem;
  box-shadow: var(--shadow);
}
.price {
  font-size: clamp(2rem, 6vw, 2.6rem);
  margin: 0.1rem 0;
  font-weight: 800;
}
.muted { color: var(--text-muted); }

.form-placeholder {
  display: grid;
  gap: 0.7rem;
}
.form-placeholder label { font-size: 0.9rem; font-weight: 600; }
.form-placeholder input {
  width: 100%;
  padding: 0.72rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #f8fafc;
}
.form-placeholder button { opacity: 0.6; cursor: not-allowed; }

footer {
  border-top: 1px solid var(--border);
  padding: 1.4rem 0 2rem;
  margin-top: 2rem;
  background: #f0f4f9;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0.65rem;
}
.footer-links a { color: #18407f; }

.back-to-top {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: #fff;
  box-shadow: var(--shadow);
  display: none;
}
.back-to-top.show { display: inline-grid; place-items: center; }

@media (min-width: 820px) {
  .menu-btn { display: none; }
  .desktop-nav { display: flex; }
  .grid.cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .table-like { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero { padding-top: 2.8rem; }
}

@media (min-width: 1040px) {
  .grid.cards.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}