body {
  font-family: 'Poppins', sans-serif;
  margin: 0;
  background: linear-gradient(120deg, #b0b4b7,#b0b4b7,#b0b4b7);
  background-size: 400% 400%;
  color: #222;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Hero Section */
.hero {
  position: relative;
  width: 100%;
  height: 220px;
  background: url('https://images.unsplash.com/photo-1522202176988-66273c2fd55f?auto=format&fit=crop&w=1400&q=80') center/cover;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  overflow: hidden;
  border-bottom-left-radius: 40px;
  border-bottom-right-radius: 40px;
}

.hero .overlay {
  position: absolute;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(4px);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
}

.hero-content h1 {
  font-size: 2.4em;
  margin-bottom: 10px;
  font-weight: 600;
}

main {
  width: 100%;
  max-width: 1000px;
  margin-top: -40px;
  z-index: 3;
}

/* Reader Box */
.reader-container {
  background: rgba(255, 255, 255, 0.6);
  border-radius: 20px;
  padding: 25px;
  box-shadow: 0 8px 25px rgba(0,0,0,0.15);
  backdrop-filter: blur(10px);
}

textarea {
  width: 96.5%;
  height: 150px;
  border: none;
  border-radius: 15px;
  padding: 15px;
  font-size: 16px;
  background: rgba(255, 255, 255, 0.8);
  box-shadow: inset 0 2px 5px rgba(0,0,0,0.1);
  outline: none;
}

textarea:focus {
  box-shadow: 0 0 8px #2563eb;
}

/* Buttons */
.controls {
  margin: 15px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

button {
  padding: 10px 22px;
  border-radius: 25px;
  border: none;
  font-weight: 500;
  font-size: 15px;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

button:hover {
  transform: scale(1.08);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

button.light { background: #ffffff; color: #111; }
button.dark { background: #111; color: white; }
button.sepia { background: #f4d28f; color: #4a3c2a; }
button.clear { background: #ef4444; color: white; }

.reader {
  margin-top: 15px;
  border-radius: 15px;
  padding: 25px;
  line-height: 1.8;
  font-size: 17px;
  min-height: 200px;
  transition: all 0.3s ease;
}

.glass-card {
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(10px);
}

/* Modes */
.light-mode { background: #f0ecec; color: black; }
.dark-mode { background: #121212; color: white; }
.sepia-mode { background: #f4ecd8; color:#B5651D; }

/* Progress Bar */
.progress-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  height: 5px;
  background: #2563eb;
  width: 0;
  transition: width 0.2s;
  border-radius: 2px;
}

footer {
  margin-top: 40px;
  text-align: center;
  color: #444;
  font-size: 14px;
  padding: 10px;
}