/* Modern UI Design - Professional Black & White Theme */
:root {
  /* Light theme variables */
  --primary: #000000;
  --primary-light: #333333;
  --secondary: #666666;
  --success: #2ecc71;
  --danger: #e74c3c;
  --warning: #f1c40f;
  --info: #3498db;
  --dark: #000000;
  --light: #ffffff;
  --gray: #666666;
  --white: #ffffff;
  --body-bg: #f5f5f5;
  --shadow: rgba(0, 0, 0, 0.1);
  --shadow-dark: rgba(0, 0, 0, 0.2);
  --border-radius: 8px;
  --font-main: "Inter", "Segoe UI", Roboto, -apple-system, BlinkMacSystemFont, sans-serif;
  --card-bg: #ffffff;
  --text-primary: #000000;
  --text-secondary: #666666;
  --border-color: #e0e0e0;
  --input-bg: #ffffff;
  --input-border: #e0e0e0;
  --input-text: #000000;
  --button-bg: #000000;
  --button-text: #ffffff;
  --button-hover: #333333;
  --container-bg: #ffffff;
  --editor-bg: #ffffff;
  --icon-filter: none;
}

[data-theme="dark"] {
  --primary: #ffffff;
  --primary-light: #cccccc;
  --secondary: #999999;
  --body-bg: #121212;
  --card-bg: #1e1e1e;
  --text-primary: #ffffff;
  --text-secondary: #cccccc;
  --border-color: #333333;
  --input-bg: #2d2d2d;
  --input-border: #404040;
  --input-text: #ffffff;
  --button-bg: #ffffff;
  --button-text: #000000;
  --button-hover: #e0e0e0;
  --container-bg: #1a1a1a;
  --editor-bg: #2d2d2d;
  --icon-filter: invert(1);
}

/* === BASE STYLES === */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-main);
  background: var(--body-bg);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: background-color 0.3s ease, color 0.3s ease;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: all 0.3s ease;
}

a:hover {
  color: var(--primary-light);
  text-decoration: underline;
}

/* === HEADER === */
header {
  background: var(--card-bg);
  color: var(--text-primary);
  box-shadow: 0 4px 12px var(--shadow);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  display: grid;
  grid-template-columns: 200px 1fr auto auto;
  align-items: center;
  gap: 1.5rem;
}

header .logo {
  display: flex;
  align-items: center;
}

header .title {
  text-align: center;
}

header .title h1 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-shadow: 1px 1px 2px var(--shadow-dark);
  margin: 0;
  white-space: nowrap;
}

header .controls {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

header .logo img {
  height: 45px;
  filter: drop-shadow(0 2px 4px var(--shadow-dark));
  transition: transform 0.3s ease;
}

header .logo img:hover {
  transform: scale(1.05);
}

header .user-info {
  background-color: rgba(255, 255, 255, 0.15);
  padding: 0.5rem 1rem;
  border-radius: 30px;
  -webkit-backdrop-filter: blur(5px);
  backdrop-filter: blur(5px);
  font-size: 0.9rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* === CONTAINERS === */
.container {
  max-width: 900px;
  width: 90%;
  margin: 2rem auto;
  background-color: var(--container-bg);
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: 0 8px 24px var(--shadow);
  transition: all 0.3s ease;
  position: relative;
  border: 1px solid var(--border-color);
}

.container:hover {
  transform: translateY(-5px);
}

/* === LOGIN & SIGNUP === */
.login-container,
.signup-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 75vh;
}

.login-box,
.signup-box {
  background: var(--white);
  padding: 2.5rem;
  width: 100%;
  max-width: 450px;
  border-radius: var(--border-radius);
  box-shadow: 0 10px 30px var(--shadow);
  text-align: center;
  transition: all 0.3s ease;
}

.login-box:hover,
.signup-box:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 35px var(--shadow);
}

.login-box h2,
.signup-box h2 {
  color: var(--primary);
  margin-bottom: 1.5rem;
  font-weight: 600;
  font-size: 1.75rem;
}

.form-group {
  position: relative;
  margin-bottom: 1.25rem;
}

.login-box input,
.signup-box input,
.modal-content input,
.form-group input {
  width: 100%;
  padding: 0.75rem 1rem;
  margin-bottom: 0.5rem;
  border: 1px solid var(--input-border);
  border-radius: 6px;
  font-size: 1rem;
  transition: all 0.3s ease;
  background-color: var(--input-bg);
  color: var(--input-text);
}

.login-box input:focus,
.signup-box input:focus,
.modal-content input:focus,
.form-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
}

.form-group.focused label {
  color: var(--primary);
}

.form-group label {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
  font-weight: 500;
}

.login-box p,
.signup-box p {
  margin-top: 1rem;
  color: var(--gray);
  font-size: 0.9rem;
}

#loginMessage,
#signupMessage,
#redeemMessage,
#adminLoginMessage,
.result-message {
  color: var(--danger);
  font-size: 0.9rem;
  margin-top: 0.75rem;
  min-height: 20px;
}

.success-message {
  color: #10b981 !important;
}

.error-message {
  color: var(--danger) !important;
}

/* === BUTTONS === */
button {
  background: var(--button-bg);
  color: var(--button-text);
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

button:hover {
  background: var(--button-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
}

button:active {
  transform: translateY(1px);
  box-shadow: 0 2px 5px rgba(67, 97, 238, 0.3);
}

button[disabled] {
  opacity: 0.7;
  cursor: not-allowed;
}

button.copied,
button.saved {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  box-shadow: 0 4px 10px rgba(16, 185, 129, 0.3);
}

button.replaced {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  box-shadow: 0 4px 10px rgba(16, 185, 129, 0.3);
  animation: pulse 0.5s ease-in-out;
}

button.delete-btn {
  background: linear-gradient(135deg, var(--danger) 0%, #b91c1c 100%);
  box-shadow: 0 4px 10px rgba(247, 37, 133, 0.3);
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

button.delete-btn:hover {
  background: linear-gradient(135deg, #b91c1c 0%, var(--danger) 100%);
}

/* Button groups */
.buttons,
.admin-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

/* === EDITOR === */
.editor-container {
  position: relative;
  margin-bottom: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 4px 12px var(--shadow);
  overflow: hidden;
}

#editor {
  width: 100%;
  min-height: 450px;
  padding: 1.25rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: var(--editor-bg);
  font-size: 1rem;
  line-height: 1.6;
  outline: none;
  transition: all 0.3s ease;
  overflow-y: auto;
  color: var(--text-primary);
}

#editor:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 2px rgba(72, 149, 239, 0.2);
}

.clear-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(255, 255, 255, 0.8);
  border: none;
  color: #777;
  font-size: 16px;
  padding: 8px 12px;
  cursor: pointer;
  border-radius: 50%;
  box-shadow: 0 2px 5px var(--shadow);
  transition: all 0.2s ease;
  z-index: 5;
}

.clear-btn:hover {
  background: var(--danger);
  color: white;
  transform: rotate(90deg);
}

/* === MODALS === */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  -webkit-backdrop-filter: blur(3px);
  backdrop-filter: blur(3px);
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.modal.active {
  opacity: 1;
  display: flex;
}

.modal-content {
  background-color: var(--card-bg);
  color: var(--text-primary);
  padding: 2rem;
  border-radius: 12px;
  width: 90%;
  max-width: 550px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 15px 40px var(--shadow-dark);
  transform: translateY(20px);
  transition: all 0.3s ease;
  position: relative;
  border: 1px solid var(--border-color);
}

.modal.active .modal-content {
  transform: translateY(0);
}

.modal-content h3 {
  color: var(--primary);
  margin-bottom: 1rem;
}

.close-btn {
  position: absolute;
  top: 15px;
  right: 20px;
  font-size: 1.5rem;
  background: none;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  color: var(--gray);
  box-shadow: none;
}

.close-btn:hover {
  color: var(--danger);
  transform: rotate(90deg);
  box-shadow: none;
}

/* === ALERTS === */
.alert {
  padding: 1rem;
  margin: 1rem 0;
  border-radius: var(--border-radius);
  display: none;
  animation: fadeInUp 0.3s ease;
  background-color: var(--card-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.success {
  background-color: rgba(46, 204, 113, 0.1);
  border-left: 4px solid var(--success);
}

.error {
  background-color: rgba(231, 76, 60, 0.1);
  border-left: 4px solid var(--danger);
}

/* === ADMIN PANEL === */
#adminPanelContainer {
  padding: 0;
  margin: 2rem auto;
  max-width: 950px;
  width: 90%;
}

.admin-content {
  background: white;
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: 0 8px 24px var(--shadow);
}

.admin-content h2 {
  color: var(--primary);
  margin-bottom: 1.5rem;
  font-weight: 600;
}

.admin-section {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
}

.admin-section h3 {
  margin-bottom: 1rem;
  font-size: 1.3rem;
  color: var(--dark);
  font-weight: 500;
}

.admin-section h4 {
  margin: 1.5rem 0 0.75rem;
  font-size: 1.1rem;
  color: var(--dark);
  font-weight: 500;
}

.admin-footer {
  display: flex;
  justify-content: flex-end;
  margin-top: 2rem;
}

/* Rules container */
.rules-container {
  margin-bottom: 1rem;
}

.rule-group {
  background: #f8fafc;
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: 0 2px 5px var(--shadow);
  transition: all 0.3s ease;
}

.rule-group:hover {
  box-shadow: 0 4px 12px var(--shadow);
}

.rule-group input {
  flex: 1;
  padding: 0.65rem;
  border: 1px solid #e0e0e0;
  border-radius: 4px;
  transition: all 0.3s ease;
}

.rule-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.15);
}

/* Codes & Users Tables */
.codes-table,
.users-table {
  margin: 1rem 0 2rem;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 6px var(--shadow);
}

.code-row,
.user-row {
  display: grid;
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  transition: all 0.2s ease;
  background-color: var(--card-bg);
}

.code-row {
  grid-template-columns: 2fr 1fr 0.8fr 1fr 1fr;
  gap: 0.5rem;
}

.user-row {
  grid-template-columns: 1fr 1.5fr 1fr 1fr 1fr;
  gap: 0.5rem;
}

.code-row:hover,
.user-row:hover {
  background-color: var(--body-bg);
}

.code-row.active,
.user-row.active {
  border-left: 4px solid #10b981;
}

.code-row.expired,
.user-row.expired {
  border-left: 4px solid #ef4444;
  color: #6b7280;
}

.user-row.no-code {
  border-left: 4px solid #9ca3af;
}

.code-value,
.user-name {
  font-weight: 600;
}

.code-status,
.user-email {
  font-size: 0.9rem;
}

.code-row.active .code-status {
  color: #10b981;
  font-weight: 500;
}

.code-row.expired .code-status {
  color: #ef4444;
}

.code-expires,
.code-devices,
.code-usage,
.user-code,
.user-expiry,
.user-last-login {
  font-size: 0.85rem;
  color: #6b7280;
}

.users-section {
  margin-top: 2rem;
}

/* === FOOTER === */
footer {
  margin-top: auto;
  padding: 1.25rem;
  background: var(--card-bg);
  color: var(--text-primary);
  text-align: center;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  align-items: center;
  width: 100%;
  border-top: 1px solid var(--border-color);
}

footer .footer-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

footer .footer-links a {
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: color 0.3s ease;
}

footer .footer-links a:hover {
  color: var(--info);
  text-decoration: none;
}

footer .footer-copy {
  font-weight: 500;
  font-size: 0.9rem;
}

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

.spinner {
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top: 3px solid white;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  animation: spin 1s linear infinite;
  display: inline-block;
  vertical-align: middle;
  margin-right: 0.5rem;
}

.fade-in {
  animation: fadeIn 0.3s ease-in;
}

/* === ANIMATIONS === */
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  header {
    grid-template-columns: 1fr;
    gap: 0.75rem;
    padding: 1rem;
  }

  header .logo {
    width: 100%;
    justify-content: center;
  }

  header .title {
    margin: 0.5rem 0;
  }

  header .controls {
    justify-content: center;
  }

  header .title h1 {
    font-size: 1.5rem;
  }

  .buttons {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }

  .container {
    padding: 1.5rem;
    margin: 1.5rem auto;
  }

  .code-row,
  .user-row {
    grid-template-columns: 1fr;
    grid-gap: 0.5rem;
    padding: 1rem 0.75rem;
  }

  .code-value,
  .user-name {
    font-size: 1rem;
    margin-bottom: 0.3rem;
  }

  footer {
    flex-direction: column;
    gap: 1rem;
  }

  footer .footer-links {
    margin-bottom: 0.5rem;
    justify-content: center;
  }

  .rule-group {
    flex-direction: column;
    align-items: stretch;
  }

  .admin-buttons {
    flex-direction: column;
  }
}

@media (max-width: 576px) {
  .login-box,
  .signup-box {
    padding: 1.5rem;
  }

  .modal-content {
    padding: 1.5rem 1rem;
  }

  .admin-content {
    padding: 1.5rem 1rem;
  }
}

/* Theme Toggle Button - Improved Design */
.theme-toggle {
  background: var(--card-bg);
  border: 2px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 2px 8px var(--shadow);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  margin: 0;
  z-index: 2;
}

.theme-toggle::before {
  content: '';
  position: absolute;
  inset: 2px;
  border-radius: 50%;
  background: linear-gradient(45deg, var(--primary), var(--primary-light));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.theme-toggle::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid transparent;
  background: linear-gradient(45deg, var(--primary), var(--primary-light)) border-box;
  -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: destination-out;
  mask-composite: exclude;
  opacity: 0.5;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px var(--shadow-dark);
}

.theme-toggle:hover::before {
  opacity: 0.1;
}

.theme-toggle:hover::after {
  opacity: 1;
  border-width: 2px;
}

.theme-toggle img {
  width: 20px;
  height: 20px;
  transition: all 0.3s ease;
  filter: var(--icon-filter);
  position: relative;
  z-index: 2;
}

.theme-toggle:hover img {
  transform: scale(1.1);
}

/* Theme Options Menu */
.theme-options {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 0.5rem;
  box-shadow: 0 4px 16px var(--shadow);
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  z-index: 1000;
  min-width: 160px;
  transform-origin: top right;
  animation: menuSlideIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes menuSlideIn {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(-10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.theme-options.active {
  display: flex;
}

.theme-option {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  color: var(--text-primary);
  position: relative;
  overflow: hidden;
}

.theme-option:hover {
  background: var(--body-bg);
  transform: translateX(3px);
}

.theme-option.active {
  background: var(--primary);
  color: var(--white);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.theme-option i {
  font-size: 1.1rem;
  width: 20px;
  text-align: center;
  transition: all 0.3s ease;
  filter: var(--icon-filter);
}

.theme-option.active i {
  filter: none;
}

.theme-option span {
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.2px;
}

/* User Profile Icon */
.user-profile {
  position: relative;
  cursor: pointer;
}

.profile-icon {
  width: 40px;
  height: 40px;
  background: var(--primary);
  color: var(--card-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 500;
  text-transform: uppercase;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px var(--shadow);
}

.profile-icon:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px var(--shadow-dark);
}

/* Profile Dropdown Menu */
.profile-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 0.5rem;
  min-width: 180px;
  box-shadow: 0 4px 16px var(--shadow);
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  z-index: 1000;
  transform-origin: top right;
  animation: menuSlideIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.profile-menu.active {
  display: flex;
}

.profile-menu-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  border-radius: 8px;
  transition: all 0.2s ease;
  cursor: pointer;
}

.profile-menu-item i {
  font-size: 1.1rem;
  width: 20px;
  text-align: center;
  color: var(--text-secondary);
  transition: all 0.3s ease;
}

.profile-menu-item span {
  font-size: 0.95rem;
  font-weight: 500;
}

.profile-menu-item:hover {
  background: var(--body-bg);
  transform: translateX(3px);
}

.profile-menu-item.signout {
  color: var(--danger);
}

.profile-menu-item.signout i {
  color: var(--danger);
}

/* Profile Info Section */
.profile-info {
  padding: 1rem;
  margin-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.profile-info .name {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.profile-info .email {
  font-size: 0.9rem;
  color: var(--text-secondary);
  word-break: break-all;
}