* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, Arial, sans-serif;
  background: #0b1020;
  color: #e5e7eb;
  line-height: 1.5; /* Improved readability */
}

/* Header */
header {
  background: #020617;
  padding: 20px 16px; /* Slightly more padding for breathing room */
  border-bottom: 1px solid #1e293b;
  text-align: center;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3); /* Subtle shadow for depth */
}

.logo {
  font-size: 28px; /* Slightly larger for prominence */
  font-weight: 700;
  margin-bottom: 8px;
}

.subtitle {
  color: #94a3b8;
  font-size: 16px; /* Slightly larger for better readability */
}

/* Home */
.home {
  min-height: 80vh;
  display: flex;
  margin: auto;
  flex-direction: column;
  gap: 32px; /* Increased gap for better spacing */
  justify-content: center;
  align-items: center;
  padding: 20px; /* Added padding for mobile edges */
}

.home-btn {
  width: 320px; /* Slightly wider for better presence */
  max-width: 90%;
  padding: 24px;
  font-size: 26px;
  border-radius: 16px;
  border: none;
  cursor: pointer;
  background: linear-gradient(135deg, #2563eb, #1d4ed8); /* Subtle gradient for professionalism */
  color: white;
  transition: all 0.3s ease; /* Smoother transition */
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3); /* Professional shadow */
}

.home-btn:hover {
  transform: translateY(-2px); /* Subtle lift on hover */
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

.home-btn:active {
  transform: translateY(0);
}

/* Layout */
.container {
  max-width: min(600px, 99%);
  margin: auto;
  padding: 16px;
}

.panel {
  background: #020617;
  border: 1px solid #1e293b;
  border-radius: 16px; /* Slightly more rounded for modern look */
  padding: 20px; /* Increased padding */
  margin-top: 16px; /* More margin for separation */
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3); /* Enhanced shadow for depth */
}

.backBtn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  width: auto;
  background: #0f172a;
  border: 1px solid #1e293b;
  color: #e5e7eb;
  font-size: 14px;
  padding: 8px 16px; /* More padding */
  border-radius: 10px;
  cursor: pointer;
  margin-bottom: 16px; /* More margin */
  transition: all 0.2s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.backBtn:hover {
  background: #1e293b;
  border-color: #334155;
  transform: translateX(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.backBtn:active {
  transform: translateX(0);
}

.backIcon {
  font-size: 16px;
  line-height: 1;
}

.backText {
  font-weight: 500;
}

/* Inputs & Buttons */
button,
input {
  width: 100%;
  padding: 14px; /* Slightly more padding */
  border-radius: 12px; /* More rounded */
  border: none;
  font-size: 16px; /* Larger for better touch targets */
  transition: all 0.2s ease;
}

input {
  background: #020617;
  color: #e5e7eb;
  border: 1px solid #1e293b;
  margin-bottom: 12px; /* More margin */
}

input:focus {
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2); /* Focus ring for accessibility */
}

button {
  margin-top: 12px; /* More margin */
  cursor: pointer;
  font-weight: 500;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.primary {
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: white;
}

.primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.secondary {
  background: linear-gradient(135deg, #334155, #475569);
  color: white;
}

.secondary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(51, 65, 85, 0.3);
}

button:disabled {
  background: #1e293b;
  cursor: not-allowed;
  box-shadow: none;
}

button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.3);
}

.big-action {
  font-size: 18px;
  padding: 16px;
}

/* Drop zone */
.drop-zone {
  border: 2px dashed #334155;
  border-radius: 14px;
  padding: 24px; /* More padding */
  text-align: center;
  color: #cbd5f5;
  margin-bottom: 12px; /* More margin */
  transition: 0.3s ease;
  background: rgba(15, 23, 42, 0.5); /* Subtle background */
}

.drop-zone.drag {
  background: #0f172a;
  border-color: #22c55e;
  box-shadow: 0 0 20px rgba(34, 197, 94, 0.3);
}

/* Summary */
.summary {
  font-size: 14px; /* Slightly larger */
  color: #94a3b8;
  margin: 8px 0;
  text-align: center;
}

/* Table */
.table-wrap {
  max-height: 240px;
  overflow-y: auto;
  margin-top: 8px;
  border-radius: 8px;
  background: rgba(2, 6, 23, 0.5); /* Subtle background */
}

.file-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.file-table th,
.file-table td {
  border-bottom: 1px solid #1e293b;
  padding: 8px; /* More padding */
  text-align: left;
  word-break: break-word;
}

.file-table th {
  color: #94a3b8;
  font-weight: 600;
}

/* Progress bar */
.progress {
  height: 8px; /* Slightly taller */
  background: #1e293b;
  border-radius: 6px;
  overflow: hidden;
  margin: 8px 0;
}

.progress span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, #22c55e, #16a34a); /* Gradient for progress */
  width: 0%;
  transition: width 0.3s ease;
}

/* Room box */
.room-box {
  margin-top: 16px; /* More margin */
  background: #0f172a;
  padding: 20px; /* More padding */
  border-radius: 14px;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.room-code {
  font-size: 32px; /* Larger */
  letter-spacing: 4px;
  font-weight: bold;
  margin-bottom: 12px;
  color: #e5e7eb;
}

.room-actions {
  display: flex;
  gap: 12px; /* More gap */
  margin-bottom: 12px;
}

.room-actions button {
  flex: 1;
}

/* QR Code Box - Enhanced */
.qr-box {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 20px 0; /* Neat margins */
  padding: 16px; /* Padding around the box */
  background: #020617; /* Matching panel background */
  border: 1px solid #1e293b;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25); /* Professional shadow */
}

.qr-box img {
  width: 140px;
  height: 140px;
  border-radius: 8px; /* Slight rounding for the image */
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3); /* Shadow on the QR itself */
}

/* Footer */
footer {
  text-align: center;
  padding: 16px; /* More padding */
  color: #93c5fd;
  font-size: 14px;
  background: #020617;
  border-top: 1px solid #1e293b;
}

/* Utility */
.hidden {
  display: none !important;
}

/* Font Awesome spacing */
i {
  margin-right: 8px;
}

/* Buttons with icons */
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

/* Home buttons */
.home-btn i {
  font-size: 24px; /* Slightly larger */
}

/* Back icon tighter */
.backBtn i {
  margin-right: 4px;
  font-size: 16px;
}

/* File icon in table */
.file-table i {
  color: #60a5fa;
}

/* Download icon */
a i {
  margin-right: 6px;
}

/* Professional shadows - already applied above */

/* Subtle hover for actions - enhanced above */

/* OTP Room Code Input */
.otp-wrap {
  display: flex;
  justify-content: center;
  gap: 12px; /* More gap */
  margin: 16px 0;
}

.otp {
  width: 48px; /* Slightly wider */
  height: 58px; /* Slightly taller */
  text-align: center;
  font-size: 24px; /* Larger */
  font-weight: 600;
  border-radius: 12px;
  border: 1px solid #1e293b;
  background: #020617;
  color: #e5e7eb;
  outline: none;
  transition: all 0.2s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.otp:focus {
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.3);
}

/* Shake animation for wrong OTP */
@keyframes shake {
  0% {
    transform: translateX(0);
  }
  20% {
    transform: translateX(-6px);
  }
  40% {
    transform: translateX(6px);
  }
  60% {
    transform: translateX(-6px);
  }
  80% {
    transform: translateX(6px);
  }
  100% {
    transform: translateX(0);
  }
}

.otp-wrap.shake {
  animation: shake 0.4s;
}

::-webkit-scrollbar {
  display: none;
}

.terms {
  color: #94a3b8;
  font-size: 14px;
  text-decoration: underline;
  text-align: center;
  display: block;
  margin: 20px auto 25px; /* Neat margins */
}

.terms1 {
  color: #94a3b8;
  font-size: 14px;
  text-align: center;
  display: block;
  margin: 20px auto; /* Neat margins */
}

/* Responsive Design */

/* Mobile (up to 600px) */
@media (max-width: 600px) {
  .home-btn {
    font-size: 22px;
    padding: 20px;
  }

  .room-code {
    font-size: 26px;
  }

  .panel {
    padding: 16px;
  }

  .otp {
    width: 40px;
    height: 50px;
    font-size: 20px;
  }

  .container {
    padding: 12px;
  }

  .table-wrap {
    max-height: 200px;
  }

  .file-table {
    font-size: 13px;
  }

  .qr-box img {
    width: 120px;
    height: 120px;
  }

  .qr-box {
    padding: 12px;
  }
}

/* Tablet (601px to 1024px) */
@media (min-width: 601px) and (max-width: 1024px) {
  .container {
    max-width: 800px;
    padding: 20px;
  }

  .home-btn {
    width: 350px;
    font-size: 28px;
    padding: 24px;
  }

  .panel {
    padding: 20px;
  }

  .room-code {
    font-size: 32px;
  }

  .qr-box img {
    width: 160px;
    height: 160px;
  }

  .table-wrap {
    max-height: 300px;
  }

  .file-table {
    font-size: 15px;
  }

  .otp {
    width: 50px;
    height: 60px;
    font-size: 24px;
  }

  .qr-box {
    padding: 18px;
  }
}

/* PC and larger screens (1025px+) */
@media (min-width: 1025px) {
  .container {
    max-width: 1000px;
    padding: 24px;
  }

  .home-btn {
    width: 400px;
    font-size: 30px;
    padding: 26px;
  }

  .panel {
    padding: 24px;
  }

  .room-code {
    font-size: 36px;
  }

  .qr-box img {
    width: 180px;
    height: 180px;
  }

  .table-wrap {
    max-height: 350px;
  }

  .file-table {
    font-size: 16px;
  }

  .otp {
    width: 55px;
    height: 65px;
    font-size: 26px;
  }

  .qr-box {
    padding: 20px;
  }

  /* For very large screens, center the home section more */
  .home {
    max-width: 1200px;
    margin: 0 auto;
  }
}