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

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --text: #111827;
  --muted: #6b7280;
  --bg: #f8fafc;
  --card: #ffffff;
  --border: #e5e7eb;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
}

.header {
  height: 70px;
  padding: 0 6%;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 24px;
  font-weight: 800;
}

.logo span {
  color: var(--primary);
}

nav {
  display: flex;
  gap: 22px;
}

nav a {
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
}

main {
  width: min(100%, 1000px);
  margin: auto;
  padding: 60px 20px;
}

.hero {
  text-align: center;
  margin-bottom: 35px;
}

.badge {
  display: inline-block;
  background: #dbeafe;
  color: var(--primary-dark);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 18px;
}

.hero h1 {
  font-size: clamp(34px, 7vw, 58px);
  line-height: 1.05;
  margin-bottom: 18px;
}

.hero p {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.6;
}

.compressor {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 25px;
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.06);
}

.upload-box {
  border: 2px dashed #bfdbfe;
  border-radius: 18px;
  padding: 55px 20px;
  text-align: center;
  background: #f8fbff;
  transition: 0.2s;
}

.upload-box:hover {
  border-color: var(--primary);
  background: #eff6ff;
}

.upload-icon {
  font-size: 48px;
  margin-bottom: 15px;
}

.upload-box h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.upload-box p {
  color: var(--muted);
  margin-bottom: 22px;
}

.upload-btn,
.compress-btn,
.download-btn {
  display: inline-block;
  background: var(--primary);
  color: white;
  border: 0;
  padding: 13px 22px;
  border-radius: 10px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: 0.2s;
}

.upload-btn:hover,
.compress-btn:hover,
.download-btn:hover {
  background: var(--primary-dark);
}

.upload-btn input {
  display: none;
}

.upload-box small {
  display: block;
  margin-top: 14px;
  color: var(--muted);
}

.controls {
  margin-top: 25px;
}

.controls label {
  display: block;
  margin-bottom: 12px;
  font-size: 15px;
}

#quality {
  width: 100%;
  margin-bottom: 20px;
}

#compressBtn {
  width: 100%;
  padding: 14px;
  border: 0;
  border-radius: 10px;
  background: var(--primary);
  color: white;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}

.result {
  margin-top: 25px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.stats div {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  text-align: center;
}

.stats span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 7px;
}

.stats strong {
  font-size: 18px;
}

.download-btn {
  width: 100%;
  text-align: center;
}

.info {
  margin-top: 45px;
  background: white;
  padding: 30px;
  border-radius: 18px;
  border: 1px solid var(--border);
}

.info h2 {
  margin-bottom: 12px;
}

.info p {
  color: var(--muted);
  line-height: 1.7;
}

footer {
  text-align: center;
  padding: 35px 20px;
  color: var(--muted);
  font-size: 13px;
}

footer a {
  color: var(--muted);
  margin-left: 15px;
  text-decoration: none;
}

.hidden {
  display: none;
}

@media (max-width: 600px) {
  .header {
    padding: 0 20px;
  }

  nav {
    gap: 12px;
  }

  nav a {
    font-size: 13px;
  }

  main {
    padding: 40px 14px;
  }

  .compressor {
    padding: 14px;
  }

  .upload-box {
    padding: 45px 15px;
  }

  .stats {
    grid-template-columns: 1fr;
  }
}