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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: #1e293b;
  background-color: #f8fafc;
  overflow-x: hidden;
}
@media (max-width: 480px) {
  body {
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
    min-width: 320px;
  }
}

::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: #f1f5f9;
}
::-webkit-scrollbar-thumb {
  background: #94a3b8;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #64748b;
}

input[type=password]::-ms-reveal, input[type=password]::-ms-clear {
  display: none !important;
  width: 0 !important;
  height: 0 !important;
}
input[type=password]::-webkit-credentials-auto-fill-button {
  display: none !important;
  visibility: hidden !important;
  pointer-events: none !important;
  position: absolute !important;
  right: -50px !important;
}
input[type=password]::-moz-reveal {
  display: none !important;
}

/* PWA Install Button Styles */
.install-btn, .install-btn-desktop {
  background: #007bff;
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
  transition: background-color 0.2s ease;
  margin: 8px 0;
  width: 100%;
}

.install-btn:hover, .install-btn-desktop:hover {
  background: #0056b3;
}

.install-btn-desktop {
  width: auto;
  margin: 0;
  padding: 6px 12px;
}
input[type=password]::-webkit-textfield-decoration-container {
  visibility: hidden !important;
}
input[type=password]::--webkit-password-auto-fill-button {
  display: none !important;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  color: #1e293b;
  padding: 20px 0;
}
@media (max-width: 768px) {
  h1, h2, h3, h4, h5, h6 {
    padding: 30px 0;
  }
}
@media (max-width: 480px) {
  h1, h2, h3, h4, h5, h6 {
    padding: 40px 15px;
  }
}

h1 {
  font-size: 3rem;
}

h2 {
  font-size: 2.5rem;
}

h3 {
  font-size: 2rem;
}

h4 {
  font-size: 1.5rem;
}

h5 {
  font-size: 1.25rem;
}

h6 {
  font-size: 1rem;
}

p {
  color: #64748b;
  line-height: 1.6;
  margin-bottom: 15px;
}

a {
  color: #d97706;
  text-decoration: none;
}

ul, ol {
  margin-bottom: 20px;
  padding-left: 30px;
}
@media (max-width: 480px) {
  ul, ol {
    padding-left: 20px;
    margin-bottom: 30px;
  }
}
ul li, ol li {
  margin-bottom: 5px;
  line-height: 1.6;
}
@media (max-width: 480px) {
  ul li, ol li {
    margin-bottom: 10px;
    padding-left: 5px;
  }
}

#wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  padding: 20px 0;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.auto-grid-sm {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.auto-grid-md {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.auto-grid-lg {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 20px;
}

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
}

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

.flex-col {
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

.gap-sm {
  gap: 10px;
}

.gap-md {
  gap: 15px;
}

.gap-lg {
  gap: 20px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.page-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

.auth-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 60vh;
  padding: 40px 20px;
}

.note-view-container,
.note-form-container,
.profile-container,
.share-note-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.page-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

.auth-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 60vh;
  padding: 40px 20px;
}

.note-view-container,
.note-form-container,
.profile-container,
.share-note-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

.mt-10 {
  margin-top: 10px;
}

.mt-20 {
  margin-top: 20px;
}

.mb-10 {
  margin-bottom: 10px;
}

.mb-20 {
  margin-bottom: 20px;
}

.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.hidden {
  display: none;
}

.visible {
  display: block;
}

@keyframes fadeInOut {
  0% {
    opacity: 0;
    transform: translateY(-10px);
  }
  15%, 85% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(-10px);
  }
}
@keyframes slideDown {
  from {
    transform: translateY(-100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}
@keyframes shake {
  0%, 100% {
    transform: translateX(0);
  }
  10%, 30%, 50%, 70%, 90% {
    transform: translateX(-10px);
  }
  20%, 40%, 60%, 80% {
    transform: translateX(10px);
  }
}
.fade-in-out {
  animation: fadeInOut 3s ease-in-out;
}

.slide-down {
  animation: slideDown 0.3s ease-out;
}

.pulse {
  animation: pulse 2s infinite;
}

.shake {
  animation: shake 0.5s ease-in-out;
}

.draft-notification {
  animation: fadeInOut 3s ease-in-out;
}

.field-error {
  animation: slideDown 0.2s ease-out;
}

.btn {
  display: inline-block;
  padding: 10px 20px;
  text-decoration: none;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
  text-align: center;
}
@media (max-width: 480px) {
  .btn {
    padding: 15px 30px;
    font-size: 16px;
    min-height: 44px;
    display: flex;
    justify-content: center;
    align-items: center;
  }
}
.btn-primary {
  display: inline-block;
  padding: 10px 20px;
  text-decoration: none;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
  text-align: center;
  background: #d97706;
  color: white;
}
@media (max-width: 480px) {
  .btn-primary {
    padding: 15px 30px;
    font-size: 16px;
    min-height: 44px;
    display: flex;
    justify-content: center;
    align-items: center;
  }
}
.btn-primary:hover {
  background: #b45309;
  transform: translateY(-1px);
}
.btn-secondary {
  display: inline-block;
  padding: 10px 20px;
  text-decoration: none;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
  text-align: center;
  background: #64748b;
  color: white;
}
@media (max-width: 480px) {
  .btn-secondary {
    padding: 15px 30px;
    font-size: 16px;
    min-height: 44px;
    display: flex;
    justify-content: center;
    align-items: center;
  }
}
.btn-secondary:hover {
  background: #475569;
  transform: translateY(-1px);
}
.btn-outline {
  display: inline-block;
  padding: 10px 20px;
  text-decoration: none;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
  text-align: center;
  background: transparent;
  color: #d97706;
  border: 2px solid #d97706;
}
@media (max-width: 480px) {
  .btn-outline {
    padding: 15px 30px;
    font-size: 16px;
    min-height: 44px;
    display: flex;
    justify-content: center;
    align-items: center;
  }
}
.btn-outline:hover {
  background: #d97706;
  color: white;
}
.btn-danger {
  display: inline-block;
  padding: 10px 20px;
  text-decoration: none;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
  text-align: center;
  background: #dc2626;
  color: white;
}
@media (max-width: 480px) {
  .btn-danger {
    padding: 15px 30px;
    font-size: 16px;
    min-height: 44px;
    display: flex;
    justify-content: center;
    align-items: center;
  }
}
.btn-danger:hover {
  background: #b91c1c;
  transform: translateY(-1px);
}
.btn-small {
  padding: 6px 12px;
  font-size: 13px;
}
@media (max-width: 480px) {
  .btn-small {
    padding: 12px 18px;
    font-size: 14px;
  }
}
.btn-large {
  padding: 14px 28px;
  font-size: 16px;
}
@media (max-width: 480px) {
  .btn-large {
    padding: 18px 32px;
    font-size: 16px;
  }
}
.btn-full {
  width: 100%;
}

.action-btn {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  background: #d97706;
  color: white;
  text-decoration: none;
  border-radius: 8px;
  transition: background 0.3s ease;
  font-weight: 500;
}
.action-btn:hover {
  background: #b45309;
}
@media (max-width: 480px) {
  .action-btn {
    padding: 15px 30px;
    gap: 10px;
    min-height: 48px;
  }
}

.logout-btn {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
  background: #d97706;
  color: white;
  border: none;
  padding: 8px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.3s ease;
  font-size: 14px;
  font-weight: 500;
}
.logout-btn:hover {
  background: #b45309;
}
@media (max-width: 480px) {
  .logout-btn {
    padding: 10px 15px;
    min-height: 44px;
    font-size: 16px;
    gap: 5px;
  }
}

.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  margin-bottom: 5px;
  font-weight: 600;
  color: #1e293b;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px;
  border: 2px solid #e2e8f0;
  border-radius: 4px;
  font-size: 16px;
  transition: border-color 0.3s;
  box-sizing: border-box;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: #d97706;
  box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.1);
}
@media (max-width: 480px) {
  .form-group input,
  .form-group textarea,
  .form-group select {
    padding: 15px;
    font-size: 16px;
    min-height: 44px;
  }
}
.form-group textarea {
  min-height: 300px;
  resize: vertical;
}
.form-group small {
  display: block;
  margin-top: 5px;
  color: #64748b;
  font-size: 12px;
}
.form-group.error input,
.form-group.error textarea,
.form-group.error select {
  border-color: #dc2626;
  background-color: #fef2f2;
}
.form-group.error label {
  color: #dc2626;
}

.form-row {
  display: flex;
  gap: 20px;
}
.form-row .form-group {
  flex: 1;
}
@media (max-width: 768px) {
  .form-row {
    flex-direction: column;
  }
}

.form-actions {
  display: flex;
  gap: 10px;
  margin-top: 30px;
}
@media (max-width: 768px) {
  .form-actions {
    flex-direction: column;
  }
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 10px;
}
.checkbox-group input[type=checkbox] {
  width: auto;
}

.field-error {
  color: #dc2626;
  font-size: 12px;
  margin-top: 5px;
  display: block;
}

.auth-form {
  background: #ffffff;
  border-radius: 10px;
  padding: 40px;
  box-shadow: 0 5px 15px rgba(30, 58, 138, 0.1);
  border: 1px solid #e2e8f0;
  width: 100%;
  max-width: 400px;
}
.auth-form h1 {
  text-align: center;
  margin-bottom: 10px;
  color: #475569;
}
.auth-form p {
  text-align: center;
  margin-bottom: 30px;
  color: #64748b;
}
@media (max-width: 768px) {
  .auth-form {
    padding: 30px 20px;
  }
}

.auth-links {
  text-align: center;
  margin-top: 20px;
}
.auth-links a {
  color: #d97706;
  text-decoration: none;
}

.password-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}
.password-input-wrapper input {
  padding-right: 50px;
  width: 100%;
}
.password-input-wrapper input::-ms-reveal, .password-input-wrapper input::-ms-clear {
  display: none !important;
  width: 0 !important;
  height: 0 !important;
}
.password-input-wrapper input::-webkit-credentials-auto-fill-button {
  display: none !important;
  visibility: hidden !important;
  pointer-events: none !important;
  position: absolute !important;
  right: -100px !important;
}
.password-input-wrapper input::-moz-reveal {
  display: none !important;
}
.password-input-wrapper input::-webkit-textfield-decoration-container {
  visibility: hidden !important;
}
.password-input-wrapper input::--webkit-password-auto-fill-button {
  display: none !important;
}
.password-input-wrapper::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 40px;
  background: #ffffff;
  border: 2px solid #e2e8f0;
  border-left: none;
  border-radius: 0 4px 4px 0;
  pointer-events: none;
  z-index: 1;
}
.password-input-wrapper .password-toggle {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: #ffffff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
  color: #64748b;
  transition: color 0.3s ease;
  font-size: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  z-index: 2;
}
.password-input-wrapper .password-toggle:hover {
  color: #d97706;
  background: rgba(217, 119, 6, 0.1);
}
.password-input-wrapper .password-toggle:focus {
  outline: none;
  color: #d97706;
  background: rgba(217, 119, 6, 0.1);
}
.password-input-wrapper .password-toggle .eye-icon {
  width: 16px;
  height: 16px;
  display: block;
  fill: currentColor;
}

.form-header {
  text-align: center;
  margin-bottom: 40px;
}
.form-header h1 {
  color: #475569;
  margin-bottom: 10px;
}
.form-header p {
  color: #64748b;
}

.note-form {
  background: #ffffff;
  border-radius: 10px;
  padding: 40px;
  box-shadow: 0 5px 15px rgba(30, 58, 138, 0.1);
  border: 1px solid #e2e8f0;
}
.note-form textarea {
  min-height: 300px;
  resize: vertical;
}
@media (max-width: 768px) {
  .note-form {
    padding: 30px 20px;
  }
}

header {
  background: #475569;
  color: white;
  padding: 1rem 0;
  box-shadow: 0 1px 3px rgba(71, 85, 105, 0.12);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  min-height: 60px;
  align-items: center;
}
@media (max-width: 768px) {
  .header-container {
    padding: 0 15px;
    flex-wrap: wrap;
    min-height: 70px;
    position: relative;
  }
}
@media (max-width: 480px) {
  .header-container {
    padding: 0 15px;
    flex-wrap: wrap;
    min-height: 80px;
    gap: 10px;
  }
}

.logo a {
  color: white;
  text-decoration: none;
  font-size: 1.5rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo .logo-icon {
  height: 32px;
  width: auto;
}
@media (max-width: 480px) {
  .logo .logo-icon {
    height: 28px;
  }
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 15px;
}
@media (max-width: 768px) {
  .header-actions {
    gap: 10px;
    flex-wrap: wrap;
  }
}
@media (max-width: 480px) {
  .header-actions {
    width: 100%;
    justify-content: space-between;
    gap: 5px;
    margin-top: 10px;
  }
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-right: 20px;
}
@media (max-width: 768px) {
  .user-info {
    display: none;
  }
}

.user-avatar {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #d97706;
  color: white;
  font-weight: 600;
  font-size: 16px;
}

.user-details {
  display: flex;
  flex-direction: column;
}

.welcome-text {
  font-size: 12px;
  color: #cbd5e1;
}

.user-name {
  font-weight: 600;
  color: white;
}

.user-nav {
  display: flex;
  align-items: center;
  gap: 15px;
}
@media (max-width: 768px) {
  .user-nav {
    gap: 10px;
    flex-wrap: wrap;
  }
}
@media (max-width: 480px) {
  .user-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    width: 100%;
  }
  .user-nav .nav-link,
  .user-nav .logout-form {
    width: 100%;
  }
  .user-nav .logout-btn {
    width: 100%;
  }
}

.nav-link {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
  color: white;
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 6px;
  transition: background 0.3s ease;
  font-size: 14px;
  white-space: nowrap;
}
.nav-link:hover {
  background: rgba(255, 255, 255, 0.12);
}
@media (max-width: 768px) {
  .nav-link {
    padding: 10px 15px;
    font-size: 14px;
    min-height: 44px;
  }
}
@media (max-width: 480px) {
  .nav-link {
    padding: 15px 20px;
    font-size: 16px;
    min-height: 48px;
  }
}

.profile-link,
.login-link,
.register-link {
  color: white;
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 6px;
  transition: background 0.3s ease;
  font-weight: 500;
  white-space: nowrap;
}
.profile-link:hover,
.login-link:hover,
.register-link:hover {
  background: rgba(255, 255, 255, 0.12);
}
@media (max-width: 480px) {
  .profile-link,
  .login-link,
  .register-link {
    padding: 10px 15px;
    font-size: 16px;
    min-height: 44px;
    display: flex;
    justify-content: center;
    align-items: center;
  }
}

.register-link {
  background: #d97706;
}
.register-link:hover {
  background: #b45309;
}

.auth-actions {
  display: flex;
  align-items: center;
  gap: 15px;
}
@media (max-width: 480px) {
  .auth-actions {
    gap: 10px;
    flex-wrap: wrap;
  }
}

.mobile-menu-btn {
  display: none;
  background: #d97706;
  border: none;
}
@media (max-width: 1024px) {
  .mobile-menu-btn {
    display: flex;
  }
}
.mobile-menu-btn:hover {
  background: #b45309;
}

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  z-index: 1001;
  padding: 10px;
  min-height: 44px;
  min-width: 44px;
  justify-content: center;
  align-items: center;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all 0.3s ease;
  order: -1;
}
.hamburger:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.3);
}
.hamburger span {
  width: 22px;
  height: 2px;
  background: white;
  margin: 2px 0;
  transition: 0.3s ease;
  border-radius: 2px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}
.hamburger.active {
  background: rgba(255, 255, 255, 0.2);
}
.hamburger.active span:nth-child(1) {
  transform: rotate(-45deg) translate(-4px, 5px);
}
.hamburger.active span:nth-child(2) {
  opacity: 0;
}
.hamburger.active span:nth-child(3) {
  transform: rotate(45deg) translate(-4px, -5px);
}
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }
}

.nav-container {
  background: #64748b;
  padding: 0;
  position: relative;
}

.sidebar {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 1001;
  top: 0;
  left: 0;
  background-color: #475569;
  overflow-x: hidden;
  transition: 0.5s;
  padding-top: 60px;
}
.sidebar a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 18px;
  color: rgba(255, 255, 255, 0.8);
  display: block;
  transition: 0.3s;
  white-space: nowrap;
}
.sidebar a:hover {
  color: white;
  background: rgba(255, 255, 255, 0.1);
}
.sidebar a.active {
  color: white;
  background: rgba(255, 255, 255, 0.15);
}
.sidebar .closebtn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
  margin-left: 50px;
  padding: 8px;
}
.sidebar .closebtn:hover {
  background: rgba(255, 255, 255, 0.1);
}
@media (min-width: 1025px) {
  .sidebar {
    display: none !important;
  }
}
@media screen and (max-height: 450px) {
  .sidebar {
    padding-top: 15px;
  }
  .sidebar a {
    font-size: 16px;
  }
}

.navigation {
  list-style: none;
  display: flex;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
.navigation li {
  margin: 0;
}
.navigation li a {
  display: block;
  color: white;
  text-decoration: none;
  padding: 14px 18px;
  transition: background 0.3s ease;
  font-weight: 500;
}
.navigation li a:hover, .navigation li a.active {
  background: #475569;
}
.navigation li:last-child {
  border-bottom: none;
}
@media (max-width: 1024px) {
  .navigation {
    display: none !important;
  }
}

.hero-section {
  background: #475569;
  color: white;
  padding: 80px 0;
  text-align: center;
}
@media (max-width: 768px) {
  .hero-section {
    padding: 40px 0;
  }
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}
.hero-content h1 {
  color: white;
  font-size: 3rem;
  margin-bottom: 20px;
  font-weight: 600;
}
@media (max-width: 768px) {
  .hero-content h1 {
    font-size: 2rem;
  }
}
.hero-content p {
  color: white;
}

.hero-subtitle {
  font-size: 1.2rem;
  margin-bottom: 30px;
  opacity: 0.9;
}

.hero-actions {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}
@media (max-width: 768px) {
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
}

.features-section {
  padding: 60px 0;
  background: white;
}
.features-section h2 {
  text-align: center;
  margin-bottom: 50px;
  font-size: 2.5rem;
  color: #1e293b;
  font-weight: 600;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
@media (max-width: 480px) {
  .features-grid {
    padding: 0 10px;
  }
}

.feature-card {
  background: #ffffff;
  border-radius: 10px;
  padding: 30px;
  box-shadow: 0 5px 15px rgba(30, 58, 138, 0.1);
  border: 1px solid #e2e8f0;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  text-align: center;
}
.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(30, 58, 138, 0.1);
}
@media (max-width: 480px) {
  .feature-card {
    padding: 20px;
  }
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 20px;
}

.feature-card h3 {
  margin-bottom: 15px;
  color: #1e293b;
  font-weight: 600;
}
.feature-card p {
  color: #64748b;
  line-height: 1.6;
}

.cta-section {
  background: #334155;
  color: white;
  padding: 60px 0;
  text-align: center;
}
.cta-section h2 {
  margin-bottom: 15px;
  color: white;
}
.cta-section p {
  margin-bottom: 30px;
  opacity: 0.9;
}

.cta-actions {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}
@media (max-width: 768px) {
  .cta-actions {
    flex-direction: column;
    align-items: center;
  }
}

.cta-buttons {
  display: flex;
  gap: 15px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 30px;
}

.notes-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  padding: 0 20px;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}
@media (max-width: 768px) {
  .notes-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }
}

.notes-title h1 {
  color: #475569;
  margin-bottom: 5px;
}
.notes-title p {
  color: #64748b;
}

.notes-filters {
  background: #ffffff;
  border-radius: 10px;
  padding: 30px;
  box-shadow: 0 5px 15px rgba(30, 58, 138, 0.1);
  border: 1px solid #e2e8f0;
  margin-bottom: 30px;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  background: linear-gradient(135deg, #ffffff 0%, #fafbfc 100%);
  border: 2px solid #e2e8f0;
}
@media (max-width: 480px) {
  .notes-filters {
    margin: 0 5px 30px 5px;
    padding: 20px;
  }
}

.filter-form {
  display: flex;
  gap: 15px;
  align-items: end;
  flex-wrap: wrap;
}
@media (max-width: 768px) {
  .filter-form {
    flex-direction: column;
    align-items: stretch;
    gap: 20px;
  }
}
@media (max-width: 480px) {
  .filter-form {
    text-align: center;
    justify-content: center;
  }
  .filter-form .filter-group {
    text-align: left;
    width: 100%;
    max-width: 400px;
    margin: 0 auto 20px auto;
  }
  .filter-form .filter-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    margin-top: 15px;
    width: 100%;
  }
}

.filter-group {
  flex: 1;
  min-width: 200px;
  position: relative;
}
@media (max-width: 768px) {
  .filter-group {
    min-width: auto;
  }
}
.filter-group input[type=text] {
  width: 100%;
  padding: 10px;
  border: 2px solid #e2e8f0;
  border-radius: 4px;
  font-size: 16px;
  transition: border-color 0.3s;
  box-sizing: border-box;
  background: #ffffff;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  padding: 15px 20px;
  font-size: 16px;
  font-weight: 500;
  transition: all 0.3s ease;
  box-shadow: 0 2px 4px rgba(71, 85, 105, 0.06);
}
.filter-group input[type=text]:focus {
  outline: none;
  border-color: #d97706;
  box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.1);
}
@media (max-width: 480px) {
  .filter-group input[type=text] {
    padding: 15px;
    font-size: 16px;
    min-height: 44px;
  }
}
.filter-group input[type=text]::placeholder {
  color: #64748b;
  font-weight: 400;
}
.filter-group input[type=text]:focus {
  border-color: #d97706;
  box-shadow: 0 0 0 4px rgba(217, 119, 6, 0.1), 0 4px 12px rgba(71, 85, 105, 0.15);
  background: #ffffff;
  transform: translateY(-1px);
}
.filter-group input[type=text]:hover:not(:focus) {
  border-color: #94a3b8;
  box-shadow: 0 4px 8px rgba(71, 85, 105, 0.1);
}
@media (max-width: 480px) {
  .filter-group input[type=text] {
    text-align: center;
    font-size: 16px;
  }
  .filter-group input[type=text]::placeholder {
    text-align: center;
  }
  .filter-group input[type=text]:focus::placeholder {
    text-align: left;
  }
}
.filter-group select {
  width: 100%;
  padding: 10px;
  border: 2px solid #e2e8f0;
  border-radius: 4px;
  font-size: 16px;
  transition: border-color 0.3s;
  box-sizing: border-box;
  appearance: none;
  background: #ffffff url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e") no-repeat right 10px center;
  background-size: 20px;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  padding: 15px 30px 15px 20px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 2px 4px rgba(71, 85, 105, 0.06);
}
.filter-group select:focus {
  outline: none;
  border-color: #d97706;
  box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.1);
}
@media (max-width: 480px) {
  .filter-group select {
    padding: 15px;
    font-size: 16px;
    min-height: 44px;
  }
}
.filter-group select:focus {
  border-color: #d97706;
  box-shadow: 0 0 0 4px rgba(217, 119, 6, 0.1), 0 4px 12px rgba(71, 85, 105, 0.15);
  background-color: #ffffff;
  transform: translateY(-1px);
}
.filter-group select:hover:not(:focus) {
  border-color: #94a3b8;
  box-shadow: 0 4px 8px rgba(71, 85, 105, 0.1);
}
.filter-group select option {
  padding: 10px;
  font-weight: 400;
  background: #ffffff;
  color: #1e293b;
}
@media (max-width: 480px) {
  .filter-group select {
    text-align: center;
    font-size: 16px;
  }
}

.filter-form .btn {
  padding: 15px 30px;
  font-weight: 600;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(71, 85, 105, 0.08);
  transition: all 0.3s ease;
}
.filter-form .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(71, 85, 105, 0.15);
}
.filter-form .btn.btn-secondary {
  background: linear-gradient(135deg, #64748b 0%, #475569 100%);
  border: none;
}
.filter-form .btn.btn-secondary:hover {
  background: linear-gradient(135deg, #475569 0%, #334155 100%);
}
.filter-form .btn.btn-outline {
  background: #ffffff;
  border: 2px solid #e2e8f0;
  color: #64748b;
}
.filter-form .btn.btn-outline:hover {
  background: #f1f5f9;
  border-color: #94a3b8;
  color: #1e293b;
}
@media (max-width: 480px) {
  .filter-form .btn {
    min-width: 140px;
    padding: 20px 30px;
    font-size: 16px;
  }
}
@media (max-width: 480px) {
  .filter-form.filter-form {
    flex-direction: column;
    align-items: center;
  }
  .filter-form .btn {
    margin: 5px 10px;
    flex: 0 0 auto;
  }
  .filter-form .btn:not(:last-child) {
    margin-right: 10px;
  }
}

.notes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
@media (max-width: 768px) {
  .notes-grid {
    grid-template-columns: 1fr;
  }
}

.note-card {
  background: #ffffff;
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 5px 15px rgba(30, 58, 138, 0.1);
  border: 1px solid #e2e8f0;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.note-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(30, 58, 138, 0.1);
}
.note-card .note-header {
  margin-bottom: 15px;
}
.note-card .note-header h3 {
  margin-bottom: 10px;
}
.note-card .note-header h3 a {
  color: #475569;
  text-decoration: none;
}
.note-card .note-header h3 a:hover {
  color: #d97706;
}
.note-card .note-meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}
.note-card .note-content {
  margin: 15px 0;
  color: #1e293b;
  line-height: 1.5;
}
.note-card .note-tags {
  margin: 15px 0;
}
.note-card .note-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 15px;
  padding-top: 15px;
  border-top: 1px solid #e2e8f0;
  font-size: 14px;
}
@media (max-width: 768px) {
  .note-card .note-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}
.note-card .note-author,
.note-card .note-date {
  color: #64748b;
}
.note-card .note-actions {
  display: flex;
  gap: 5px;
}

.category {
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
}
.category-personal {
  background: #f0f9ff;
  color: #64748b;
}
.category-work {
  background: #fef3e2;
  color: #d97706;
}
.category-study {
  background: #fefce8;
  color: #ca8a04;
}
.category-project {
  background: #fef2f2;
  color: #dc2626;
}
.category-other {
  background: #f1f5f9;
  color: #64748b;
}

.public-badge {
  background: #f0fdf4;
  color: #059669;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}

.private-badge {
  background: #fef2f2;
  color: #dc2626;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}

.shared-by {
  background: #f1f5f9;
  color: #1e293b;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}

.permission {
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}
.permission-read {
  background: #f0f9ff;
  color: #64748b;
}
.permission-write {
  background: #fef3e2;
  color: #d97706;
}

.tag {
  display: inline-block;
  background: #f1f5f9;
  color: #1e293b;
  padding: 3px 8px;
  border-radius: 3px;
  font-size: 12px;
  margin-right: 5px;
  margin-bottom: 5px;
}

.note-header {
  background: #ffffff;
  border-radius: 10px;
  padding: 30px;
  box-shadow: 0 5px 15px rgba(30, 58, 138, 0.1);
  border: 1px solid #e2e8f0;
  margin-bottom: 20px;
}
@media (max-width: 768px) {
  .note-header {
    padding: 20px;
  }
}

.note-title-section h1 {
  color: #475569;
  margin-bottom: 15px;
}

.note-author,
.note-editor {
  margin-bottom: 10px;
  color: #1e293b;
}

.note-date {
  font-size: 14px;
  color: #64748b;
}

.note-content {
  background: #ffffff;
  border-radius: 10px;
  padding: 30px;
  box-shadow: 0 5px 15px rgba(30, 58, 138, 0.1);
  border: 1px solid #e2e8f0;
  margin-bottom: 20px;
}
@media (max-width: 768px) {
  .note-content {
    padding: 20px;
  }
}

.content-text {
  line-height: 1.8;
  font-size: 16px;
  color: #1e293b;
}

.empty-content {
  text-align: center;
  color: #64748b;
  font-style: italic;
}

.collaborators-section {
  background: #ffffff;
  border-radius: 10px;
  padding: 30px;
  box-shadow: 0 5px 15px rgba(30, 58, 138, 0.1);
  border: 1px solid #e2e8f0;
  margin-bottom: 20px;
}
.collaborators-section h3 {
  color: #475569;
  margin-bottom: 20px;
}

.collaborator-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px;
  background: #f1f5f9;
  border-radius: 8px;
  margin-bottom: 10px;
  flex-wrap: wrap;
  gap: 10px;
}
@media (max-width: 768px) and (min-width: 500px) {
  .collaborator-item {
    flex-direction: row;
    align-items: center;
  }
  .collaborator-item .collaborator-info {
    flex: 1;
    margin-right: 15px;
  }
  .collaborator-item .collaborator-date {
    flex-shrink: 0;
    margin: 0 15px 0 0;
    font-size: 14px;
  }
  .collaborator-item .collaborator-actions {
    flex-shrink: 0;
  }
}
@media (max-width: 480px) {
  .collaborator-item {
    flex-direction: column;
    align-items: stretch;
  }
}
.collaborator-item .collaborator-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px;
}
@media (max-width: 480px) {
  .collaborator-item .collaborator-info {
    margin-bottom: 10px;
    flex-direction: column;
    align-items: flex-start;
    gap: 5px;
  }
}
@media (max-width: 360px) {
  .collaborator-item .collaborator-info {
    flex-direction: column;
    align-items: flex-start;
    gap: 5px;
  }
}
@media (max-width: 480px) {
  .collaborator-item .collaborator-info strong {
    word-break: break-word;
  }
}
.collaborator-item .collaborator-date {
  flex-shrink: 0;
  font-size: 14px;
  color: #64748b;
}
@media (max-width: 480px) {
  .collaborator-item .collaborator-date {
    margin-bottom: 10px;
    order: 2;
    font-size: 13px;
  }
}
.collaborator-item .collaborator-actions {
  flex-shrink: 0;
}
@media (max-width: 480px) {
  .collaborator-item .collaborator-actions {
    order: 3;
    width: 100%;
  }
  .collaborator-item .collaborator-actions .btn {
    width: 100%;
    justify-content: center;
  }
}

.permission {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  white-space: nowrap;
}
.permission.permission-read {
  background: #e0f2fe;
  color: #0277bd;
}
.permission.permission-write {
  background: #e8f5e8;
  color: #2e7d32;
}
@media (max-width: 480px) {
  .permission {
    font-size: 11px;
    padding: 2px 6px;
  }
}
@media (max-width: 360px) {
  .permission {
    font-size: 10px;
    padding: 1px 4px;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
  }
}

.note-stats {
  background: #ffffff;
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 5px 15px rgba(30, 58, 138, 0.1);
  border: 1px solid #e2e8f0;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 30px;
}
.note-stats .stat-item {
  text-align: center;
}
.note-stats .stat-item strong {
  color: #475569;
}

.profile-header {
  text-align: center;
  margin-bottom: 40px;
}
.profile-header h1 {
  color: #475569;
  margin-bottom: 10px;
}
.profile-header p {
  color: #64748b;
}

.profile-section {
  background: #ffffff;
  border-radius: 10px;
  padding: 30px;
  box-shadow: 0 5px 15px rgba(30, 58, 138, 0.1);
  border: 1px solid #e2e8f0;
  margin-bottom: 30px;
}
.profile-section h2 {
  color: #1e293b;
  margin-bottom: 15px;
  font-weight: 600;
}
.profile-section .section-description {
  color: #64748b;
  margin-bottom: 25px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 20px;
}
@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
}

.stat-card {
  text-align: center;
  padding: 20px;
  background: #f1f5f9;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
}

.action-buttons {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
}
@media (max-width: 768px) {
  .action-buttons {
    flex-direction: column;
  }
}

.password-form .form-group {
  margin-bottom: 20px;
}

.danger-section {
  border: 2px solid #fecaca;
  background: #fef2f2;
}
.danger-section h2 {
  color: #dc2626;
}

.danger-actions {
  margin-top: 20px;
}

.danger-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  background: white;
  border-radius: 8px;
  border: 1px solid #fecaca;
}
.danger-item .danger-info h3 {
  color: #dc2626;
  margin-bottom: 5px;
}
.danger-item .danger-info p {
  color: #64748b;
  margin: 0;
}
@media (max-width: 768px) {
  .danger-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 15px;
  }
}

.user-dashboard {
  background: white;
  padding: 60px 0;
}

.quick-actions h3 {
  margin-bottom: 20px;
  color: #1e293b;
}

.action-icon {
  font-size: 18px;
}

.modal {
  display: flex;
  justify-content: center;
  align-items: center;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(71, 85, 105, 0.5);
  z-index: 1000;
}

.modal-content {
  background: #ffffff;
  border-radius: 10px;
  padding: 30px;
  box-shadow: 0 5px 15px rgba(30, 58, 138, 0.1);
  border: 1px solid #e2e8f0;
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
}
@media (max-width: 768px) {
  .modal-content {
    padding: 20px;
    margin: 20px;
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  border-bottom: 1px solid #e2e8f0;
  padding-bottom: 15px;
}
.modal-header h3 {
  color: #dc2626;
  margin: 0;
}

.close-btn {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: #64748b;
}
.close-btn:hover {
  color: #1e293b;
}

.modal-body ul {
  margin: 15px 0;
  padding-left: 20px;
}
.modal-body ul li {
  margin-bottom: 5px;
  color: #64748b;
}

.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 25px;
  padding-top: 20px;
  border-top: 1px solid #e2e8f0;
}
@media (max-width: 768px) {
  .modal-actions {
    flex-direction: column;
  }
}

.messages-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
.messages-container .alert {
  padding: 12px 16px;
  border-radius: 6px;
  margin-bottom: 15px;
  border: 1px solid transparent;
  font-weight: 500;
}
.messages-container .alert-success {
  background-color: #f0fdf4;
  color: #059669;
  border-color: #bbf7d0;
}
.messages-container .alert-error {
  background-color: #fef2f2;
  color: #dc2626;
  border-color: #fecaca;
}
.messages-container .alert-info {
  background-color: #eff6ff;
  color: #2563eb;
  border-color: #bfdbfe;
}
.messages-container .alert-warning {
  background-color: #fffbeb;
  color: #d97706;
  border-color: #fed7aa;
}

.error-message,
.success-message,
.info-message {
  padding: 15px;
  border-radius: 4px;
  margin-bottom: 20px;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.error-message {
  background: #fef2f2;
  color: #dc2626;
  border: 1px solid #fecaca;
}

.success-message {
  background: #f0fdf4;
  color: #059669;
  border: 1px solid #bbf7d0;
}

.info-message {
  background: #eff6ff;
  color: #94a3b8;
  border: 1px solid #bfdbfe;
}

footer {
  background: #334155;
  color: white;
  padding: 40px 0 20px;
  margin-top: 60px;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-bottom: 30px;
}
.footer-content .footer-section h3, .footer-content .footer-section h4 {
  margin-bottom: 15px;
  color: white;
}
.footer-content .footer-section p {
  color: white;
}
.footer-content .footer-section ul {
  list-style: none;
}
.footer-content .footer-section ul li {
  margin-bottom: 8px;
}
.footer-content .footer-section ul li a {
  color: #cbd5e1;
  text-decoration: none;
  transition: color 0.3s;
}
.footer-content .footer-section ul li a:hover {
  color: #f59e0b;
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid #475569;
  color: #cbd5e1;
}

.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 15px;
  margin-top: 40px;
  padding: 20px;
}

.page-info {
  color: #64748b;
  font-size: 14px;
}

.stat-card {
  background: #ffffff;
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 5px 15px rgba(30, 58, 138, 0.1);
  border: 1px solid #e2e8f0;
  text-align: center;
  border: 1px solid #e2e8f0;
}

.stat-number {
  font-size: 2rem;
  font-weight: bold;
  color: #d97706;
  margin-bottom: 5px;
}

.stat-label {
  color: #64748b;
  font-size: 14px;
}

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: #64748b;
}
.empty-state .empty-icon {
  font-size: 4rem;
  margin-bottom: 20px;
}
.empty-state h3 {
  margin-bottom: 15px;
  color: #1e293b;
}
.empty-state p {
  margin-bottom: 25px;
}

.collaborator-card {
  background: #ffffff;
  border-radius: 10px;
  padding: 15px;
  box-shadow: 0 5px 15px rgba(30, 58, 138, 0.1);
  border: 1px solid #e2e8f0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.collaborator-info {
  display: flex;
  align-items: center;
  gap: 20px;
  flex: 1;
}
.collaborator-info .collaborator-details .real-name {
  color: #666;
  font-size: 0.9em;
}
.collaborator-info .collaborator-email {
  color: #888;
  font-size: 0.85em;
}

.collaborator-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.shared-date {
  font-size: 0.8em;
  color: #888;
  margin-top: 4px;
}

.page-header {
  text-align: center;
  margin-bottom: 40px;
  padding: 30px 20px;
}
@media (max-width: 768px) {
  .page-header {
    padding: 40px 15px;
  }
}
@media (max-width: 480px) {
  .page-header {
    padding: 60px 15px;
  }
}
.page-header h1 {
  color: #475569;
  margin-bottom: 10px;
  padding: 20px 0;
}
@media (max-width: 480px) {
  .page-header h1 {
    padding: 30px 0;
  }
}
.page-header p {
  color: #64748b;
}

.page-content {
  background: #ffffff;
  border-radius: 10px;
  padding: 40px;
  box-shadow: 0 5px 15px rgba(30, 58, 138, 0.1);
  border: 1px solid #e2e8f0;
}
@media (max-width: 480px) {
  .page-content {
    padding: 30px 20px;
  }
}

.about-section {
  margin-bottom: 40px;
}
.about-section h2 {
  color: #475569;
  margin-bottom: 20px;
}

.features-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 20px;
}
@media (max-width: 480px) {
  .features-list {
    grid-template-columns: 1fr;
  }
}

.feature-item {
  padding: 20px;
  background: #f1f5f9;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
}
.feature-item h3 {
  color: #d97706;
  margin-bottom: 10px;
}

.use-cases {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-top: 20px;
}
@media (max-width: 480px) {
  .use-cases {
    grid-template-columns: 1fr;
  }
}

.use-case {
  padding: 20px;
  background: #f1f5f9;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
  text-align: center;
}
.use-case h4 {
  color: #475569;
  margin-bottom: 10px;
}

.error-container {
  text-align: center;
  padding: 60px 20px;
  max-width: 600px;
  margin: 0 auto;
}

.error-code {
  font-size: 6rem;
  font-weight: bold;
  color: #d97706;
  margin-bottom: 20px;
}

.error-container h1 {
  color: #475569;
  margin-bottom: 15px;
}
.error-container p {
  color: #64748b;
  margin-bottom: 30px;
}

.error-actions {
  display: flex;
  gap: 15px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 40px;
}
@media (max-width: 768px) {
  .error-actions {
    flex-direction: column;
    align-items: center;
  }
}

.helpful-links {
  background: #ffffff;
  border-radius: 10px;
  padding: 30px;
  box-shadow: 0 5px 15px rgba(30, 58, 138, 0.1);
  border: 1px solid #e2e8f0;
}
.helpful-links h3 {
  color: #475569;
  margin-bottom: 15px;
}
.helpful-links ul {
  list-style: none;
  text-align: left;
  padding-left: 0;
}
.helpful-links ul li {
  margin-bottom: 10px;
  padding-left: 10px;
}
@media (max-width: 480px) {
  .helpful-links ul li {
    margin-bottom: 15px;
    padding-left: 15px;
  }
}
.helpful-links ul li a {
  color: #d97706;
  text-decoration: none;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
  margin-top: 30px;
}
@media (max-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

.contact-info h2 {
  color: #475569;
  margin-bottom: 20px;
}

.contact-methods {
  margin-top: 30px;
}

.contact-method {
  margin-bottom: 25px;
  padding: 20px;
  background: #f1f5f9;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
}
.contact-method h4 {
  color: #d97706;
  margin-bottom: 10px;
}
.contact-method p {
  font-weight: 600;
  color: #1e293b;
  margin-bottom: 5px;
}
.contact-method small {
  color: #64748b;
}

.contact-form-section {
  background: #f1f5f9;
  padding: 30px;
  border-radius: 10px;
  border: 1px solid #e2e8f0;
}
@media (max-width: 480px) {
  .contact-form-section {
    padding: 20px;
  }
}

.contact-form .form-group label {
  color: #1e293b;
}

.help-quick-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
  margin-bottom: 30px;
}

.help-link {
  display: block;
  padding: 15px;
  background: #f1f5f9;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  text-decoration: none;
  color: #475569;
  font-weight: 500;
  text-align: center;
  transition: all 0.2s ease;
}
.help-link:hover {
  background: #475569;
  color: white;
  transform: translateY(-2px);
}

.help-item {
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 1px solid;
}
.help-item:last-child {
  border-bottom: none;
}
.help-item h3 {
  color: #1e293b;
  margin-bottom: 15px;
  font-size: 1.1rem;
}
.help-item ol, .help-item ul {
  margin-bottom: 15px;
}
.help-item li {
  margin-bottom: 10px;
  line-height: 1.6;
  padding-left: 5px;
}
@media (max-width: 480px) {
  .help-item li {
    margin-bottom: 15px;
    padding-left: 10px;
  }
}

.faq-item {
  margin-bottom: 20px;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  overflow: hidden;
}

.faq-question {
  background: #f8fafc;
  padding: 15px 20px;
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: #1e293b;
  cursor: pointer;
  border-bottom: 1px solid #e2e8f0;
  position: relative;
  border: none;
  width: 100%;
  text-align: left;
}
.faq-question::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  font-weight: bold;
  color: #475569;
}
.faq-question:hover {
  background: #f1f5f9;
}

.faq-answer {
  padding: 20px;
  background: #ffffff;
  display: none;
}
.faq-answer p {
  margin: 0;
  line-height: 1.6;
}

.about-section[id] {
  scroll-margin-top: 30px;
}

.terms-list {
  counter-reset: term-counter;
  padding-left: 0;
}
.terms-list li {
  counter-increment: term-counter;
  margin-bottom: 20px;
  padding-left: 0;
  list-style: none;
  position: relative;
}
.terms-list li::before {
  content: counter(term-counter) ". ";
  font-weight: bold;
  color: #475569;
  margin-right: 5px;
}
.terms-list li strong {
  color: #1e293b;
  display: block;
  margin-bottom: 5px;
}

.page-content h3 {
  color: #475569;
  margin-top: 20px;
  margin-bottom: 10px;
  font-size: 1.1rem;
}
.page-content ul {
  margin-bottom: 20px;
}
.page-content ul li {
  margin-bottom: 10px;
  line-height: 1.6;
  padding-left: 5px;
}
@media (max-width: 480px) {
  .page-content ul li {
    margin-bottom: 15px;
    padding-left: 10px;
  }
}

.report-note-info {
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 6px;
  padding: 15px;
  margin-bottom: 20px;
}
.report-note-info h4 {
  color: #dc2626;
  margin-bottom: 5px;
}
.report-note-info p {
  margin-bottom: 5px;
  color: #1e293b;
}

.reporting-info,
.developer-info {
  background: #ffffff;
  border-radius: 10px;
  padding: 30px;
  box-shadow: 0 5px 15px rgba(30, 58, 138, 0.1);
  border: 1px solid #e2e8f0;
  margin-top: 30px;
}
.reporting-info h3,
.developer-info h3 {
  color: #475569;
  margin-bottom: 15px;
}
.reporting-info ul,
.developer-info ul {
  list-style-type: disc;
  padding-left: 20px;
}
.reporting-info ul li,
.developer-info ul li {
  margin-bottom: 10px;
  line-height: 1.6;
}

.developer-info {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  border: 2px solid #bae6fd;
}

.btn-danger:contains("Admin") {
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
}
.btn-danger:contains("Admin"):hover {
  background: linear-gradient(135deg, #b91c1c 0%, #991b1b 100%);
  box-shadow: 0 4px 12px rgba(220, 38, 38, 0.3);
}

@media (max-width: 480px) {
  .help-quick-links {
    grid-template-columns: 1fr;
  }
  .faq-question {
    padding: 10px 15px;
    font-size: 0.9rem;
  }
  .faq-answer {
    padding: 15px;
  }
  .report-note-info {
    padding: 10px;
  }
  .report-note-info h4 {
    font-size: 1rem;
  }
  .reporting-info,
  .developer-info {
    padding: 20px;
  }
  .reporting-info ul,
  .developer-info ul {
    padding-left: 15px;
  }
}
.share-form-section {
  background: #f1f5f9;
  padding: 20px;
  border-radius: 8px;
  margin-bottom: 30px;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 20px;
}
.form-row:first-child {
  grid-template-columns: 2fr 1fr;
}
@media (max-width: 768px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

.permission-badge {
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.8em;
  font-weight: bold;
  text-transform: uppercase;
}

.sharing-tips {
  background: #fff3cd;
  border: 1px solid #ffeaa7;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 30px;
}
.sharing-tips ul {
  margin: 10px 0 0 20px;
}
.sharing-tips ul li {
  margin-bottom: 8px;
}

.note-sharing-info {
  background: #f1f5f9;
  border-radius: 8px;
  padding: 20px;
}

.note-info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 15px;
  margin-top: 15px;
}
@media (max-width: 768px) {
  .note-info-grid {
    grid-template-columns: 1fr;
  }
}

.info-item {
  padding: 10px;
  background: white;
  border-radius: 4px;
  border-left: 3px solid #007bff;
}

.no-collaborators {
  text-align: center;
  padding: 40px;
  color: #666;
}

@media (max-width: 768px) {
  .hero-content h1 {
    font-size: 2rem;
  }
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  .notes-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }
  .filter-form {
    flex-direction: column;
  }
  .filter-group {
    min-width: auto;
  }
  .notes-grid {
    grid-template-columns: 1fr;
  }
  .note-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  .form-row {
    flex-direction: column;
  }
  .form-actions {
    flex-direction: column;
  }
  .auth-form {
    padding: 30px 20px;
  }
  .note-form {
    padding: 30px 20px;
  }
  .note-header,
  .note-content {
    padding: 20px;
  }
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .action-buttons {
    flex-direction: column;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .error-actions {
    flex-direction: column;
    align-items: center;
  }
  .cta-actions {
    flex-direction: column;
    align-items: center;
  }
}
@media (max-width: 480px) {
  .container,
  .notes-filters,
  .notes-grid {
    padding: 0 15px;
    margin: 0 5px;
  }
  .hero-section {
    padding: 40px 15px;
    margin: 0;
  }
  .features-grid {
    padding: 0 15px;
    margin: 0 5px;
  }
  .feature-card {
    padding: 20px;
    margin: 0 5px 20px 5px;
  }
  .page-content {
    padding: 20px 15px;
    margin: 0 5px;
    word-wrap: break-word;
    overflow-wrap: break-word;
  }
  .contact-form-section {
    padding: 15px;
    margin: 0 5px;
  }
  .stats-grid {
    grid-template-columns: 1fr;
    padding: 0 15px;
  }
  .features-list {
    grid-template-columns: 1fr;
    padding: 0 15px;
  }
  .use-cases {
    grid-template-columns: 1fr;
    padding: 0 15px;
  }
  * {
    max-width: 100%;
    box-sizing: border-box;
  }
  button,
  .btn,
  a[role=button],
  input[type=submit],
  input[type=button] {
    min-height: 44px;
    min-width: 44px;
  }
  input,
  textarea,
  select {
    font-size: 16px;
  }
}
@media print {
  .hamburger,
  .navigation,
  header,
  footer,
  .btn,
  .note-actions {
    display: none !important;
  }
  .note-content {
    box-shadow: none;
    border: 1px solid #ccc;
  }
  body {
    background: white;
  }
}
.loading {
  opacity: 0.6;
  pointer-events: none;
}

.spinner {
  border: 2px solid #f3f4f6;
  border-top: 2px solid #d97706;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  animation: spin 1s linear infinite;
  display: inline-block;
  margin-right: 10px;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
.btn:focus,
input:focus,
textarea:focus,
select:focus {
  outline: 2px solid #d97706;
  outline-offset: 2px;
}