/* Reset + body */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  overflow-x: hidden;
}

/* Background animation */
.background-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}
.floating-shapes {
  position: absolute;
  width: 100%;
  height: 100%;
  overflow: hidden;
}
.shape {
  position: absolute;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  animation: float 6s ease-in-out infinite;
}
.shape:nth-child(1) {
  width: 80px;
  height: 80px;
  top: 20%;
  left: 10%;
  animation-delay: 0s;
}
.shape:nth-child(2) {
  width: 120px;
  height: 120px;
  top: 60%;
  left: 80%;
  animation-delay: 2s;
}
.shape:nth-child(3) {
  width: 100px;
  height: 100px;
  top: 80%;
  left: 20%;
  animation-delay: 4s;
}
.shape:nth-child(4) {
  width: 60px;
  height: 60px;
  top: 10%;
  left: 70%;
  animation-delay: 1s;
}
@keyframes float {
  0%,
  100% {
    transform: translateY(0) rotate(0);
  }
  50% {
    transform: translateY(-20px) rotate(180deg);
  }
}

/* Card container */
.container {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 24px;
  padding: 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(255, 255, 255, 0.1);
  transition: all 0.3s ease;
  position: relative;
  z-index: 1;
}

/* Logo + heading */
.logo {
  text-align: center;
  margin-bottom: 30px;
}
.logo i {
  font-size: 48px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 10px;
}
h1 {
  color: #2d3748;
  font-size: 28px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 8px;
}
.subtitle {
  color: #718096;
  text-align: center;
  margin-bottom: 30px;
  font-size: 16px;
}

/* Form */
.form-group {
  position: relative;
  margin-bottom: 20px;
}
.form-group i {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: #a0aec0;
  font-size: 18px;
  z-index: 2;
}
input {
  width: 100%;
  padding: 16px 16px 16px 50px;
  border: 2px solid #e2e8f0;
  border-radius: 12px;
  font-size: 16px;
  background: rgba(255, 255, 255, 0.9);
  transition: all 0.3s ease;
  font-family: inherit;
}
input:focus {
  outline: none;
  border-color: #667eea;
  background: white;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}
input::placeholder {
  color: #a0aec0;
}

.btn {
  width: 100%;
  padding: 16px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}
.btn:active {
  transform: translateY(0);
}
.btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.error-message {
  background: #fed7d7;
  color: #c53030;
  padding: 12px 16px;
  border-radius: 8px;
  margin-top: 16px;
  font-size: 14px;
  border-left: 4px solid #e53e3e;
  display: none;
}

/* Portal */
.portal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 2px solid #e2e8f0;
}
.welcome-text {
  color: #2d3748;
  font-size: 24px;
  font-weight: 600;
}
.logout-btn {
  background: linear-gradient(135deg, #e53e3e, #c53030);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.3s ease;
}
.logout-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(229, 62, 62, 0.3);
}

.file-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}
.file-card {
  background: white;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e2e8f0;
  transition: all 0.3s ease;
  cursor: pointer;
}
.file-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
  border-color: #667eea;
}
.file-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, #48bb78, #38a169);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
}
.file-icon i {
  color: white;
  font-size: 20px;
}
.file-name {
  font-size: 16px;
  font-weight: 600;
  color: #2d3748;
  margin-bottom: 8px;
  line-height: 1.4;
}
.file-meta {
  font-size: 12px;
  color: #718096;
}
.loading {
  text-align: center;
  padding: 40px;
  color: #718096;
}
.loading i {
  font-size: 32px;
  animation: spin 1s linear infinite;
  margin-bottom: 16px;
  display: block;
}
@keyframes spin {
  from {
    transform: rotate(0);
  }
  to {
    transform: rotate(360deg);
  }
}

/* Animations */
.fade-in {
  animation: fadeInUp 0.6s ease;
}
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 30px 20px;
    margin: 20px;
  }
  .file-grid {
    grid-template-columns: 1fr;
  }
  .portal-header {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}