/* Ultra Premium Dark Theme - FIXED INTERACTIONS */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@100;200;300;400;500;600;700&family=JetBrains+Mono:wght@100;200;300;400;500&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:wght@100;200;300;400;500;600;700&display=swap');

:root {
  --bg-primary: #050505;
  --bg-secondary: #0f0f0f;
  --bg-glass: rgba(255, 255, 255, 0.03);
  --accent-primary: #00e5ff;
  --accent-secondary: #00b4d8;
  --accent-tertiary: #0077b6;
  --text-primary: #ffffff;
  --text-secondary: #e0e0e0;
  --text-muted: #8a8a8a;
  --border-glass: rgba(255, 255, 255, 0.08);
  --shadow-primary: rgba(0, 229, 255, 0.3);
  --shadow-secondary: rgba(0, 0, 0, 0.7);
}

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

html, body {
  height: 100%;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  background: radial-gradient(ellipse at center, #0a0a0a 0%, #000000 100%);
  color: var(--text-primary);
  overflow-x: hidden;
  font-weight: 300;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#liquid-bg {
  position: fixed;
  top: 0; left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  opacity: 0.4;
}

body {
  position: relative;
  min-height: 100vh;
  width: 100vw;
  background: var(--bg-primary);
  background: radial-gradient(ellipse at center, #0a0a0a 0%, #000000 100%);
  color: var(--text-primary);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-weight: 300;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

.container {
  text-align: center;
  max-width: 520px;
  width: 92%;
  margin: 80px auto;
  position: relative;
  z-index: 2;
}

h1 {
  font-size: 3rem;
  margin-bottom: 64px;
  color: var(--text-primary);
  font-weight: 200;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-family: 'Inter', sans-serif;
}

.glow {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary), var(--accent-tertiary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 30px var(--shadow-primary));
}

.card {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: 32px;
  padding: 48px 40px;
  margin-bottom: 40px;
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  box-shadow: 
    0 12px 48px var(--shadow-secondary),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 
    0 24px 80px var(--shadow-secondary),
    0 0 60px var(--shadow-primary);
}

h2 {
  margin-bottom: 40px;
  color: var(--text-secondary);
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 0.05em;
  font-family: 'Inter', sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.icon {
  font-size: 1.8rem;
  filter: drop-shadow(0 0 10px var(--shadow-primary));
}

input[type="text"],
input[type="file"],
button {
  display: block;
  margin: 20px auto;
  padding: 20px 24px;
  font-size: 1.1rem;
  width: 100%;
  max-width: 360px;
  background: var(--bg-glass);
  color: var(--text-primary);
  border: 1px solid var(--border-glass);
  border-radius: 16px;
  transition: all 0.3s ease;
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  font-family: 'Inter', sans-serif;
  font-weight: 300;
  letter-spacing: 0.02em;
}

input[type="text"]:focus,
input[type="file"]:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.1);
  background: rgba(255, 255, 255, 0.05);
}

input[type="text"]::placeholder {
  color: var(--text-muted);
  font-weight: 200;
}

button, .neon-btn {
  margin-top: 32px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary), var(--accent-tertiary));
  color: var(--bg-primary);
  font-weight: 500;
  letter-spacing: 0.1em;
  padding: 20px 0;
  border: none;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
  font-family: 'Inter', sans-serif;
  text-transform: uppercase;
  font-size: 1.1rem;
}

button:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 12px 40px rgba(0, 229, 255, 0.5);
}

.download-link {
  margin-top: 24px;
  display: inline-block;
  font-size: 1.2rem;
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 400;
  transition: all 0.3s ease;
  padding: 16px 32px;
  border-radius: 12px;
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.2);
  font-family: 'Inter', sans-serif;
  letter-spacing: 0.02em;
}

.download-link:hover {
  color: var(--text-primary);
  background: rgba(0, 229, 255, 0.2);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 229, 255, 0.3);
}

#status {
  margin-bottom: 32px;
  font-size: 1.2rem;
  color: var(--accent-primary);
  font-weight: 300;
  letter-spacing: 0.02em;
  min-height: 32px;
  transition: all 0.3s ease;
  font-family: 'JetBrains Mono', monospace;
}

/* Premium Font Loading */
.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 300, 'GRAD' 0, 'opsz' 24;
}

/* Responsive Design */
@media (max-width: 520px) {
  .container {
    margin: 60px 20px;
  }
  
  h1 {
    font-size: 2.5rem;
  }
  
  .card {
    padding: 40px 32px;
    border-radius: 24px;
  }
}

/* --- Progress Bar Styling --- */
.progress-group {
  margin-top: 24px;
  text-align: center;
  width: 100%;
}
progress {
  width: 100%;
  height: 18px;
  border-radius: 8px;
  background: var(--bg-glass);
  box-shadow: 0 2px 12px var(--shadow-primary);
  margin-bottom: 8px;
  overflow: hidden;
}
#send-progress::-webkit-progress-value {
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 8px;
}
#receive-progress::-webkit-progress-value {
  background: linear-gradient(90deg, var(--accent-secondary), var(--accent-tertiary));
  border-radius: 8px;
}
progress::-webkit-progress-bar {
  background: var(--bg-glass);
  border-radius: 8px;
}
#send-progress::-moz-progress-bar {
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 8px;
}
#receive-progress::-moz-progress-bar {
  background: linear-gradient(90deg, var(--accent-secondary), var(--accent-tertiary));
  border-radius: 8px;
}
progress {
  color: var(--accent-primary);
  background-color: var(--bg-glass);
  border-radius: 8px;
}