* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #f4f7f6;
  --white: #ffffff;
  --navy: #374F4E; /* আপনার দেওয়া নতুন কালার */
  --navy-dark: #2a3c3c; /* হোভার করার জন্য সামান্য ডার্ক কালার */
  --text: #17202b;
  --muted: #707782;
  --line: #d9d7d1;
}

body {
  font-family: Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
}

/* Navbar */
.navbar {
  background-color: var(--white);
  padding: 15px 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo { display: flex; align-items: center; gap: 10px; }
.logo-icon {
  background-color: var(--navy);
  color: white;
  width: 35px; height: 35px;
  display: flex; justify-content: center; align-items: center;
  border-radius: 8px; font-weight: bold;
}
.logo h1 { font-size: 18px; color: var(--navy); }

.search-bar input {
  padding: 10px 15px; border: 1px solid var(--line);
  border-radius: 20px; outline: none; width: 250px;
}
.search-bar input:focus { border-color: var(--navy); }

/* Hero Section */
.hero {
  text-align: center; padding: 50px 20px;
  background-color: var(--navy); color: white;
}
.hero h2 { font-size: 32px; margin-bottom: 10px; }
.hero p { color: #eef2f3; }

/* Container & Grid */
.container { width: 90%; max-width: 1200px; margin: 40px auto; }
.section-title h3 { font-size: 22px; margin-bottom: 15px; color: var(--text); }

/* Category Filters */
.category-filters {
  display: flex; gap: 10px; margin-bottom: 25px;
  overflow-x: auto; padding-bottom: 5px;
}
.category-filters::-webkit-scrollbar { display: none; }
.filter-btn {
  padding: 8px 18px; border: 1px solid var(--navy);
  background: transparent; color: var(--navy);
  border-radius: 20px; cursor: pointer; white-space: nowrap;
  transition: 0.3s; font-weight: bold;
}
.filter-btn.active, .filter-btn:hover {
  background: var(--navy); color: white;
}

.apps-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px;
}

/* App Card */
.app-card {
  background: var(--white); border: 1px solid var(--line);
  border-radius: 15px; padding: 20px;
  display: flex; flex-direction: column; gap: 15px;
  transition: transform 0.2s;
}
.app-card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.05); }
.app-card-header { display: flex; gap: 15px; align-items: center; }
.app-icon {
  width: 60px; height: 60px; border-radius: 12px;
  background-color: var(--bg); display: flex;
  justify-content: center; align-items: center; overflow: hidden;
  font-weight: bold; color: var(--navy);
}
.app-icon img { width: 100%; height: 100%; object-fit: cover; }
.app-info h4 { font-size: 16px; margin-bottom: 5px; }
.app-info span { font-size: 12px; color: var(--muted); background: var(--bg); padding: 3px 8px; border-radius: 5px; }
.app-desc { font-size: 13px; color: var(--muted); line-height: 1.4; height: 38px; overflow: hidden; text-overflow: ellipsis; }
.app-meta { display: flex; justify-content: space-between; font-size: 12px; color: var(--navy); font-weight: bold; }
.download-btn {
  display: block; text-align: center; background-color: var(--navy);
  color: white; text-decoration: none; padding: 12px;
  border-radius: 8px; font-weight: bold; transition: 0.2s; cursor: pointer; border: none; width: 100%;
}
.download-btn:hover { background-color: var(--navy-dark); }

/* Skeleton Loading Animation */
.skeleton {
  background: #e2e5e7;
  background-image: linear-gradient(90deg, #e2e5e7 0px, #f0f2f3 40px, #e2e5e7 80px);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite linear;
  border-radius: 8px;
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
.sk-icon { width: 60px; height: 60px; border-radius: 12px; }
.sk-title { height: 16px; width: 60%; margin-bottom: 8px; }
.sk-tag { height: 14px; width: 40%; }
.sk-desc { height: 38px; width: 100%; }
.sk-btn { height: 40px; width: 100%; border-radius: 8px; }

footer { text-align: center; padding: 20px; color: var(--muted); font-size: 14px; margin-top: 50px; }
@media (max-width: 600px) {
  .navbar { flex-direction: column; gap: 15px; }
  .search-bar input { width: 100%; }
}
/* Telegram and WhatsApp Buttons */
.btn-group {
  display: flex;
  gap: 10px;
  margin-top: 5px;
}
.btn-telegram, .btn-whatsapp {
  flex: 1;
  text-align: center;
  color: white;
  text-decoration: none;
  padding: 12px 10px;
  border-radius: 8px;
  font-weight: bold;
  transition: 0.2s;
  cursor: pointer;
  border: none;
  font-size: 14px;
}
.btn-telegram {
  background-color: #0088cc; /* টেলিগ্রাম ব্লু */
}
.btn-telegram:hover {
  background-color: #0077b5;
}
.btn-whatsapp {
  background-color: #25D366; /* হোয়াটসঅ্যাপ গ্রিন */
}
.btn-whatsapp:hover {
  background-color: #20b858;
}