/* CSS Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* CSS Variables for Modern Green Theme */
:root {
  --primary-green: #10b981;
  --primary-green-hover: #059669;
  --primary-green-dark: #047857;
  --secondary-green: #34d399;
  --light-green: #d1fae5;
  --very-light-green: #ecfdf5;
  --accent-green: #065f46;

  --background-primary: #f8fafc;
  --background-secondary: #ffffff;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-light: #9ca3af;
  --border-color: #e5e7eb;
  --border-focus: #10b981;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md:
    0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg:
    0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl:
    0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Hide all app sections by default */
#loginForm,
#registrationForm,
#stepsForm,
#individualLeaderboardSection,
#groupLeaderboardSection,
#options,
#changePasswordOptions,
#changeGroupOptions,
#changeStepsOptions,
#optionBtn,
#logoutBtn {
  display: none;
}

/* Body styling */
body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
  margin: 0;
  background: linear-gradient(
    135deg,
    var(--background-primary) 0%,
    #f1f5f9 100%
  );
  min-height: 100vh;
  color: var(--text-primary);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Header styling */
header {
  background: linear-gradient(
    135deg,
    var(--primary-green) 0%,
    var(--primary-green-dark) 100%
  );
  color: white;
  width: 100%;
  padding: 1.5rem 2rem;
  text-align: center;
  position: relative;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(10px);
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin: 0;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-buttons {
  position: absolute;
  top: 50%;
  right: 2rem;
  transform: translateY(-50%);
  display: flex;
  gap: 0.75rem;
}

/* Main content area */
main {
  width: 100%;
  max-width: 28rem;
  padding: 2rem 1rem;
  flex: 1;
}

/* Form styling */
form,
section {
  background: var(--background-secondary);
  margin: 1.5rem 0;
  padding: 2rem;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

form:hover,
section:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

form h2,
section h2 {
  color: var(--text-primary);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  text-align: center;
  position: relative;
}

form h2::after,
section h2::after {
  content: "";
  position: absolute;
  bottom: -0.5rem;
  left: 50%;
  transform: translateX(-50%);
  width: 3rem;
  height: 2px;
  background: linear-gradient(
    90deg,
    var(--primary-green),
    var(--secondary-green)
  );
  border-radius: 1px;
}

/* Input styling */
input[type="text"],
input[type="password"],
input[type="number"],
input[type="date"] {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: inherit;
  background: var(--background-secondary);
  color: var(--text-primary);
  transition: var(--transition);
  outline: none;
}

input[type="text"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
input[type="date"]:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
  transform: translateY(-1px);
}

input[type="text"]:hover,
input[type="password"]:hover,
input[type="number"]:hover,
input[type="date"]:hover {
  border-color: var(--primary-green);
}

input::placeholder {
  color: var(--text-light);
  font-weight: 400;
}

/* Label styling */
label {
  display: block;
  margin-bottom: 0.5rem;
  margin-top: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

label:first-of-type {
  margin-top: 0;
}

/* Button styling */
button {
  background: linear-gradient(
    135deg,
    var(--primary-green) 0%,
    var(--secondary-green) 100%
  );
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 600;
  font-family: inherit;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

button::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: left 0.5s;
}

button:hover::before {
  left: 100%;
}

button:hover {
  background: linear-gradient(
    135deg,
    var(--primary-green-hover) 0%,
    var(--primary-green) 100%
  );
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

button:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

/* Secondary button styling */
button[type="button"]:not(.toggle-btn) {
  background: white;
  color: var(--primary-green);
  border: 2px solid var(--primary-green);
}

button[type="button"]:not(.toggle-btn):hover {
  background: var(--very-light-green);
  border-color: var(--primary-green-hover);
  color: var(--primary-green-hover);
}

/* Toggle password buttons */
#toggleLoginPassword,
#toggleRegisterPassword,
#togglePassword {
  background: var(--text-light);
  color: white;
  padding: 0.5rem 0.75rem;
  font-size: 0.75rem;
  margin-left: 0.5rem;
  border-radius: var(--radius-sm);
}

#toggleLoginPassword:hover,
#toggleRegisterPassword:hover,
#togglePassword:hover {
  background: var(--text-secondary);
}

/* Button layout helpers */
.button-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2rem;
}

.button-container {
  display: flex;
  margin-top: 1rem;
}

/* Table styling */
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

th {
  background: linear-gradient(
    135deg,
    var(--primary-green) 0%,
    var(--primary-green-dark) 100%
  );
  color: white;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.75rem;
  padding: 1rem 0.75rem;
}

td {
  padding: 1rem 0.75rem;
  border-bottom: 1px solid var(--border-color);
  font-weight: 500;
}

tr:last-child td {
  border-bottom: none;
}

tr:nth-child(even) {
  background: var(--very-light-green);
}

tr:hover {
  background: var(--light-green);
  transform: scale(1.01);
  transition: var(--transition);
}

tr.highlight {
  background: var(--light-green);
  font-weight: 600;
  color: var(--accent-green);
}

/* Step log display */
.step-log-display {
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: var(--very-light-green);
  border-radius: var(--radius-md);
  border: 1px solid var(--light-green);
}

.step-log-display ul {
  list-style: none;
}

.step-log-display li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--light-green);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}

.step-log-display li:hover {
  background: var(--light-green);
  margin: 0 -1rem;
  padding-left: 1rem;
  padding-right: 1rem;
  border-radius: var(--radius-sm);
}

.step-log-display li:last-child {
  border-bottom: none;
}

/* Feedback messages */
#stepFeedback,
#loginFeedback {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  text-align: center;
}

#stepFeedback {
  background: var(--light-green);
  color: var(--accent-green);
  border: 1px solid var(--secondary-green);
}

/* Loading states */
.loading {
  opacity: 0.7;
  pointer-events: none;
  position: relative;
}

.loading::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--primary-green);
  border-top: 2px solid transparent;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Apply animations to forms */
form,
section {
  animation: fadeIn 0.5s ease-out;
}

/* Enhanced responsive design */
@media (max-width: 640px) {
  header {
    padding: 1rem;
  }

  header h1 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
  }

  .header-buttons {
    position: static;
    transform: none;
    justify-content: center;
  }

  main {
    padding: 1rem;
    max-width: 100%;
  }

  form,
  section {
    padding: 1.5rem;
    margin: 1rem 0;
  }

  .button-row {
    flex-direction: column;
    gap: 0.75rem;
  }

  table {
    font-size: 0.875rem;
  }

  th,
  td {
    padding: 0.75rem 0.5rem;
  }
}

@media (max-width: 480px) {
  form,
  section {
    padding: 1rem;
    border-radius: var(--radius-lg);
  }

  input[type="text"],
  input[type="password"],
  input[type="number"],
  input[type="date"] {
    padding: 0.75rem;
  }

  button {
    padding: 0.75rem 1rem;
    font-size: 0.8rem;
  }
}

/* Large screen enhancements */
@media (min-width: 1024px) {
  main {
    max-width: 45rem;
  }

  form,
  section {
    padding: 2.5rem;
  }

  header h1 {
    font-size: 2.5rem;
  }
}