:root {
  /* Fluid typography */
  --fs-h1: clamp(2rem, 5vw + 1rem, 3.5rem);
  --fs-h2: clamp(1.7rem, 3.5vw + 0.9rem, 2.8rem);
  --fs-h3: clamp(1.15rem, 1.2vw + 0.9rem, 1.45rem);
  --fs-body: clamp(0.95rem, 1.25vw + 0.5rem, 1.15rem);
  --fs-small: clamp(0.85rem, 0.9vw + 0.45rem, 0.98rem);

  /* Spacing */
  --space-xs: clamp(0.5rem, 0.6vw, 0.8rem);
  --space-sm: clamp(0.9rem, 1vw, 1.25rem);
  --space-md: clamp(1.25rem, 1.6vw, 2.1rem);
  --space-lg: clamp(2rem, 2.4vw, 3rem);
  --container: clamp(320px, 80vw, 1200px);

  /* Colors */
  --brand: #0071bc;
  --brand-dark: #005fa3;
  --text: #111;
  --muted: #666;
  --bg: #fff;
  --panel: #ffffff;
  --border: #eaeaea;
  --shadow: 0 2px 10px rgba(0,0,0,0.08);

  /* Radius */
  --r-sm: 10px;
  --r-md: 14px;
  --r-pill: 999px;

  /* Header sizing */
  --header-h: 72px;
}

/* Base */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  font-size: var(--fs-body);
  line-height: 1.5;
}
a { color: inherit; }
img { max-width: 100%; height: auto; display: block; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--space-sm); }

/* Header */
header {
  position: fixed;
  top: 0;
  width: 100%;
  background: #000;
  z-index: 999;
  height: var(--header-h);
  display: flex;
  align-items: center;
}
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

/* Logo */
.logo-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.logo-wrap img { width: 150px; height: auto; }
.logo-text {
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.2px;
  white-space: nowrap;
}

/* Nav menu */
.menu a {
  color: #fff;
  margin: 0 0.7rem;
  text-decoration: none;
  font-weight: 600;
}
.menu a:hover { color: var(--brand); }

/* Mobile nav */
.hamburger { display: none; cursor: pointer; padding: 6px; }
.hamburger div { width: 26px; height: 3px; background: #fff; margin: 5px 0; }

@media (max-width: 860px) {
  .menu {
    display: none;
    flex-direction: column;
    background: #000;
    position: absolute;
    top: calc(var(--header-h) - 6px);
    right: 12px;
    padding: 14px;
    border-radius: var(--r-md);
    min-width: 220px;
    box-shadow: 0 18px 40px rgba(0,0,0,0.35);
  }
  .menu.open { display: flex; }
  .menu a { padding: 10px 6px; }
  .hamburger { display: block; }
}

/* Main spacing */
.main { padding-top: calc(var(--header-h) + 20px); }

/* Sections */
.section { padding: var(--space-md) 0; }
.section-title {
  font-size: var(--fs-h2);
  text-align: center;
  color: var(--brand);
  margin: 0 0 var(--space-sm);
}
.lead {
  text-align: center;
  max-width: 900px;
  margin: 0 auto var(--space-sm);
  color: var(--muted);
}

/* Global small text helpers */
.text-small { font-size: var(--fs-small); color: var(--muted); }
.section--small { font-size: 0.9em; }
.section--xsmall { font-size: 0.82em; }

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  color: #fff;
  text-align: center;
  padding: 52px 14px;
}
.hero h1 { font-size: var(--fs-h1); margin: 0 0 10px; }
.hero p { margin: 0 auto; max-width: 900px; opacity: 0.95; }

.hero-media {
  margin-top: 18px;
  display: grid;
  place-items: center;
}
.hero-media img {
  width: 100%;
  max-width: 980px;
  border-radius: var(--r-md);
  box-shadow: 0 12px 30px rgba(0,0,0,0.25);
}

/* Cards */
.cards {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
}
.cards--small { font-size: 0.9em; }

.card {
  padding: var(--space-sm);
  width: 290px;
  text-align: left;
  box-shadow: var(--shadow);
  border-radius: var(--r-md);
  background: var(--panel);
  border: 2px solid var(--border);
}
.card h3 {
  margin: 0.5rem 0;
  font-size: var(--fs-h3);
  color: var(--brand);
}
.card p { margin: 0.4rem 0; }

.card ul {
  list-style: none;
  padding-left: 1rem;
  margin: 0.3rem 0 0.8rem;
}
.card li { margin: 0.2rem 0;font-size: 0.9rem;
 }
.card li::before {
  content: "?";
  margin-right: 0.5rem;
  color: var(--brand);
}

/* Badges */
.badge {
  display: inline-block;
  font-size: 0.9rem;
  font-weight: 700;
  padding: 6px 10px;
  border-radius: var(--r-pill);
  background: rgba(0,113,188,0.12);
  color: var(--brand);
}

/* Themed cards */
.card.base-plan { background: #e8f4fc; border-color: var(--brand); }
.card.mid-plan { background: #fff9e6; border-color: #fbbf24; }
.card.premium-plan { background: #e6f9f9; border-color: #0bc5ea; }

.card.smartphones { background: #e8f4fc; border-color: var(--brand); }
.card.tablets { background: #f9f9f9; border-color: #fbbf24; }
.card.hotspot { background: #f1f8ff; border-color: #0bc5ea; }

.card.unlimited { background: #e6f9f9; border-color: var(--brand); }
.card.affordable { background: #fff9e6; border-color: #fbbf24; }
.card.easy-setup { background: #f8f9fc; border-color: #0bc5ea; }

/* Media blocks */
.media-block {
  max-width: 980px;
  margin: 0 auto var(--space-sm);
  display: grid;
  gap: 12px;
}
.media-block img {
  width: 100%;
  border-radius: var(--r-md);
  border: 1px solid var(--border);
}
.small-note {
  text-align: center;
  color: var(--muted);
  font-size: var(--fs-small);
}

/* Buttons */
.btn {
  display: inline-block;
  background: var(--brand);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  padding: 10px 14px;
  border-radius: var(--r-sm);
}
.btn:hover { filter: brightness(1.05); }

/* Map */
.map-wrapper {
  border: 2px solid #ddd;
  border-radius: var(--r-md);
  overflow: hidden;
  height: 380px;
}
.map-wrapper iframe { width: 100%; height: 100%; border: 0; }

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  align-items: start;
}
@media (max-width: 900px) { .contact-grid { grid-template-columns: 1fr; } }

.contact-card {
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 16px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
  background: var(--panel);
}
.contact-card h2 { margin: 0 0 10px; color: var(--brand); font-size: var(--fs-h3); }
.contact-card p { margin: 8px 0; color: var(--muted); }

/* Footer */
footer {
  text-align: center;
  background: #111;
  color: #ccc;
  padding: 1.2rem 0;
  font-size: var(--fs-small);
}

/* Scroll to Top */
#scrollToTopBtn {
  position: fixed;
  bottom: 18px;
  right: 18px;
  background: var(--brand);
  color: #fff;
  border: none;
  padding: 0.7rem 0.85rem;
  border-radius: var(--r-pill);
  cursor: pointer;
  display: none;
  font-size: 1.05rem;
  box-shadow: 0 10px 22px rgba(0,0,0,0.20);
}