:root {
  --primary-color: #6200ee;
  --primary-light: #bb86fc;
  --primary-dark: #3700b3;
  --secondary-color: #03dac6;
  --secondary-dark: #018786;
  --background-color: #f5f5f5;
  --surface-color: #ffffff;
  --error-color: #b00020;
  --success-color: #00c853;
  --on-primary: #ffffff;
  --on-secondary: #000000;
  --on-background: #000000;
  --on-surface: #000000;
  --on-error: #ffffff;

  --shadow-1: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  --shadow-2: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
  --shadow-3: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
  --shadow-4: 0 14px 28px rgba(0,0,0,0.25), 0 10px 10px rgba(0,0,0,0.22);
  --shadow-5: 0 19px 38px rgba(0,0,0,0.30), 0 15px 12px rgba(0,0,0,0.22);

  --transition-standard: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
  --transition-decelerate: all 0.3s cubic-bezier(0.0, 0.0, 0.2, 1);
  --transition-accelerate: all 0.3s cubic-bezier(0.4, 0.0, 1, 1);
}

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

body {
  font-family: 'Roboto', sans-serif;
  line-height: 1.6;
  color: var(--on-background);
  margin: 0;
  padding: 0;
  background-color: var(--background-color);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

header {
  background-color: var(--primary-color);
  color: var(--on-primary);
  padding: 16px 0;
  box-shadow: var(--shadow-2);
  position: sticky;
  top: 0;
  z-index: 100;
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 500;
  display: flex;
  align-items: center;
}

header h1 .material-icons {
  margin-right: 8px;
}

nav ul {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
}

nav ul li {
  margin-left: 16px;
}

nav ul li a {
  color: var(--on-primary);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 4px;
  transition: var(--transition-standard);
  display: flex;
  align-items: center;
  font-weight: 500;
}

nav ul li a .material-icons {
  margin-right: 8px;
  font-size: 18px;
}

nav ul li a:hover, nav ul li a:focus {
  background-color: rgba(255,255,255,0.1);
  outline: none;
}

main {
  padding: 32px 0;
}

.card {
  background-color: var(--surface-color);
  border-radius: 8px;
  box-shadow: var(--shadow-1);
  padding: 24px;
  margin-bottom: 24px;
  transition: var(--transition-standard);
  overflow: hidden;
}

.card:hover {
  box-shadow: var(--shadow-2);
  transform: translateY(-2px);
}

.card-title {
  margin-top: 0;
  margin-bottom: 16px;
  color: var(--on-surface);
  font-size: 1.5rem;
  font-weight: 500;
  border-bottom: 1px solid rgba(0,0,0,0.1);
  padding-bottom: 16px;
  display: flex;
  align-items: center;
}

.card-title .material-icons {
  margin-right: 8px;
  color: var(--primary-color);
}

.form-group {
  margin-bottom: 24px;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--on-surface);
}

input[type="text"],
input[type="email"],
input[type="file"],
textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid rgba(0,0,0,0.2);
  border-radius: 4px;
  font-size: 1rem;
  font-family: 'Roboto', sans-serif;
  transition: var(--transition-standard);
  background-color: rgba(0,0,0,0.02);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="file"]:focus,
textarea:focus {
  border-color: var(--primary-color);
  outline: none;
  box-shadow: 0 0 0 2px rgba(98, 0, 238, 0.2);
  background-color: var(--surface-color);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--primary-color);
  color: var(--on-primary);
  border: none;
  padding: 10px 24px;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.0892857143em;
  text-transform: uppercase;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition-standard);
  box-shadow: var(--shadow-1);
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255,255,255,0.3);
  opacity: 0;
  transition: var(--transition-standard);
}

.btn:hover {
  box-shadow: var(--shadow-2);
  transform: translateY(-1px);
}

.btn:hover::after {
  opacity: 0.1;
}

.btn:active {
  box-shadow: var(--shadow-1);
  transform: translateY(0);
}

.btn:active::after {
  opacity: 0.2;
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 2px rgba(98, 0, 238, 0.4), var(--shadow-1);
}

.btn .material-icons {
  margin-right: 8px;
  font-size: 18px;
}

.btn-secondary {
  background-color: transparent;
  color: var(--primary-color);
  box-shadow: none;
  border: 1px solid var(--primary-color);
}

.btn-secondary:hover {
  background-color: rgba(98, 0, 238, 0.04);
  box-shadow: none;
}

.btn-secondary:focus {
  box-shadow: 0 0 0 2px rgba(98, 0, 238, 0.4);
}

.btn-success {
  background-color: var(--success-color);
}

.btn-error {
  background-color: var(--error-color);
}

.alert {
  padding: 16px;
  border-radius: 4px;
  margin-bottom: 24px;
  display: flex;
  align-items: flex-start;
  animation: fadeIn 0.3s ease-in-out;
}

.alert .material-icons {
  margin-right: 16px;
  font-size: 24px;
}

.alert-danger {
  background-color: rgba(176, 0, 32, 0.08);
  color: var(--error-color);
  border-left: 4px solid var(--error-color);
}

.alert-success {
  background-color: rgba(0, 200, 83, 0.08);
  color: var(--success-color);
  border-left: 4px solid var(--success-color);
}

.public-key-display {
  background-color: rgba(0,0,0,0.04);
  padding: 16px;
  border-radius: 4px;
  font-family: 'Roboto Mono', monospace;
  font-size: 0.875rem;
  white-space: pre-wrap;
  word-break: break-all;
  margin-bottom: 16px;
  position: relative;
  border-left: 4px solid var(--primary-light);
  transition: var(--transition-standard);
}

.public-key-display:hover {
  background-color: rgba(0,0,0,0.06);
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background-color: var(--primary-color);
  color: var(--on-primary);
  border: none;
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 0.75rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  transition: var(--transition-standard);
  box-shadow: var(--shadow-1);
}

.copy-btn .material-icons {
  font-size: 16px;
  margin-right: 4px;
}

.copy-btn:hover {
  background-color: var(--primary-dark);
  box-shadow: var(--shadow-2);
}

.verification-result {
  text-align: center;
  padding: 32px;
  margin-top: 32px;
}

.verification-success {
  color: var(--success-color);
  font-size: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.verification-success .material-icons {
  font-size: 2.5rem;
  margin-right: 16px;
}

.verification-failure {
  color: var(--error-color);
  font-size: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.verification-failure .material-icons {
  font-size: 2.5rem;
  margin-right: 16px;
}

footer {
  background-color: var(--primary-dark);
  color: var(--on-primary);
  padding: 24px 0;
  text-align: center;
  margin-top: 48px;
  box-shadow: var(--shadow-2);
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes ripple {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* Toast notification */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background-color: #323232;
  color: white;
  padding: 12px 24px;
  border-radius: 4px;
  box-shadow: var(--shadow-2);
  z-index: 1000;
  display: flex;
  align-items: center;
  animation: toastIn 0.3s ease-out forwards;
}

.toast.hide {
  animation: toastOut 0.3s ease-in forwards;
}

.toast .material-icons {
  margin-right: 12px;
}

@keyframes toastIn {
  from { transform: translate(-50%, 100px); opacity: 0; }
  to { transform: translate(-50%, 0); opacity: 1; }
}

@keyframes toastOut {
  from { transform: translate(-50%, 0); opacity: 1; }
  to { transform: translate(-50%, 100px); opacity: 0; }
}

/* Tabs */
.nav-tabs {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0 0 24px 0;
  border-bottom: 1px solid rgba(0,0,0,0.1);
}

.nav-item {
  margin-bottom: -1px;
}

.nav-link {
  display: block;
  padding: 12px 24px;
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  cursor: pointer;
  background: none;
  color: var(--on-surface);
  font-weight: 500;
  transition: var(--transition-standard);
  text-transform: uppercase;
  letter-spacing: 0.0892857143em;
  font-size: 0.875rem;
}

.nav-link:hover, .nav-link:focus {
  color: var(--primary-color);
  outline: none;
}

.nav-link.active {
  color: var(--primary-color);
  border-bottom-color: var(--primary-color);
}

.tab-content > .tab-pane {
  display: none;
  animation: fadeIn 0.3s ease-out;
}

.tab-content > .active {
  display: block;
}

/* Responsive */
@media (max-width: 768px) {
  header .container {
    flex-direction: column;
    text-align: center;
  }

  nav ul {
    margin-top: 16px;
  }

  .card {
    padding: 16px;
  }

  .btn {
    width: 100%;
    margin-bottom: 8px;
  }
}

/* Code input container styles */
.code-input-container {
  position: relative;
  display: flex;
  align-items: center;
}

.code-input-container .material-icons {
  position: absolute;
  left: 12px;
  color: rgba(0,0,0,0.5);
}

.code-input-container input {
  padding-left: 40px;
  letter-spacing: 2px;
  font-size: 1.2rem;
  text-align: center;
}

/* Verification details styles */
.verification-details {
  background-color: rgba(0,0,0,0.02);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 24px;
  border-left: 4px solid var(--primary-light);
}

.verification-details .form-group:last-child {
  margin-bottom: 0;
}

.verification-details label {
  display: flex;
  align-items: center;
  color: var(--primary-color);
}

.verification-details label .material-icons {
  margin-right: 8px;
}

.action-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
}

.action-buttons .form-group {
  margin-bottom: 0;
}

.json-data-section {
  border-top: 1px solid rgba(0,0,0,0.1);
  padding-top: 24px;
}

@media (max-width: 768px) {
  .action-buttons {
    flex-direction: column;
    gap: 8px;
  }
}

/* File input container styles */
.file-input-container {
  position: relative;
  display: flex;
  align-items: center;
  margin-bottom: 8px;
}

.file-input-container input[type="file"] {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
  z-index: 2;
}

.file-input-button {
  display: flex;
  align-items: center;
  background-color: var(--primary-color);
  color: var(--on-primary);
  padding: 8px 16px;
  border-radius: 4px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-standard);
}

.file-input-button .material-icons {
  margin-right: 8px;
  font-size: 18px;
}

.file-input-name {
  margin-left: 16px;
  color: rgba(0,0,0,0.6);
  font-size: 0.875rem;
}

.file-input-container:hover .file-input-button {
  background-color: var(--primary-dark);
}