/* Base styles */
:root {
  --primary-color: #007BFF;
  --primary-hover: #0056b3;
  --success-color: #28A745;
  --success-hover: #218838;
  --warning-color: #ffc107; /* Added for flash messages */
  --danger-color: #dc3545;  /* Added for flash messages */
  --info-color: #17a2b8;    /* Added for flash messages */
  --text-color: #212529;
  --text-muted: #6C757D;
  --bg-light: #F8F9FA;
  --bg-white: #FFFFFF;
  --border-color: #DEE2E6;
}

.dark {
  --primary-color: #0d6efd; /* Updated blue for dark mode */
  --primary-hover: #0b5ed7;
  --success-color: #198754;
  --success-hover: #157347;
  --warning-color: #ffca2c;
  --danger-color: #e34452;
  --info-color: #31d2f2;
  --text-color: #E9ECEF;
  --text-muted: #ADB5BD;
  --bg-light: #343A40;
  --bg-white: #212529;
  --border-color: #495057;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.5;
  color: var(--text-color);
  background-color: var(--bg-white);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Typography */
h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-color);
}

h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--text-color);
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-color);
}

p {
  margin-bottom: 1rem;
  color: var(--text-muted);
}

a {
    color: var(--primary-color);
    text-decoration: none;
}
a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Header */
header {
  background-color: var(--bg-white);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo {
  display: flex;
  align-items: center;
  font-weight: bold;
  font-size: 1.25rem;
  color: var(--text-color);
  text-decoration: none;
}
.logo:hover {
    text-decoration: none;
}

.logo svg {
  margin-right: 0.5rem;
  color: var(--primary-color);
}

nav ul {
  display: flex;
  list-style: none;
  align-items: center;
}

nav li {
  margin-left: 1.5rem;
}

nav a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

nav a:hover {
  color: var(--text-color);
}

/* Desktop Navigation Styles */
.desktop-nav-wrapper {
  /* Assuming this is the primary navigation for desktop */
  /* No display: none needed here for desktop */
}
.desktop-nav-wrapper ul {
    /* Styles for the desktop ul if needed */
}
.desktop-nav-wrapper li {
    /* Styles for the desktop li if needed */
}

/* Mobile Controls Styles (Hidden on Desktop by Default) */
.mobile-controls {
  display: none;
  align-items: center;
}

/* Mobile Navigation Menu Styles (Hidden on Desktop by Default) */
.mobile-nav {
    display: none; /* <<< ADD THIS RULE TO HIDE BY DEFAULT */
    position: absolute; /* Keep positioning for when it appears */
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    z-index: 101; /* Increased z-index to be above header */
}
.mobile-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.mobile-nav li {
    /* ... existing mobile li styles ... */
}
.mobile-nav a,
.mobile-nav .dropdown-item-text,
.mobile-nav button {
    /* ... existing mobile item styles ... */
}

/* Theme Toggle */
.theme-toggle {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
}

.theme-toggle:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

.dark .theme-toggle:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.theme-toggle .sun {
  opacity: 1;
  transform: scale(1) rotate(0);
  position: absolute;
}

.theme-toggle .moon {
  opacity: 0;
  transform: scale(0) rotate(90deg);
  position: absolute;
}

.dark .theme-toggle .sun {
  opacity: 0;
  transform: scale(0) rotate(-90deg);
}

.dark .theme-toggle .moon {
  opacity: 1;
  transform: scale(1) rotate(0);
}

/* Dropdown Menu */
.dropdown {
  position: relative;
  display: inline-block;
  padding-bottom: 10px;
  margin-bottom: -10px;
}

.dropdown-content {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 5px;
  background-color: var(--bg-white);
  min-width: 160px;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
  z-index: 101;
  padding: 0.5rem 0;
  border-radius: 0.25rem;
}

.dropdown:hover .dropdown-content {
  display: block;
}

.dropdown-divider {
    height: 1px;
    margin: .5rem 0;
    overflow: hidden;
    background-color: var(--border-color);
}

/* 下拉項目樣式 */
.dropdown-content a,
.dropdown-content span.dropdown-item-text,
.dropdown-content button.dropdown-item-text {
    color: var(--text-color);
    padding: 0.5rem 1rem;
    text-decoration: none;
    display: block;
    white-space: nowrap;
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
}

.dropdown-content a:hover,
.dropdown-content span.dropdown-item-text:hover,
.dropdown-content button.dropdown-item-text:hover {
    background-color: var(--bg-light);
}

.dark .dropdown-content a:hover,
.dark .dropdown-content span.dropdown-item-text:hover,
.dark .dropdown-content button.dropdown-item-text:hover {
    background-color: var(--border-color);
}

/* User Menu Specifics */
.user-menu-btn {
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    padding: 0.5rem; /* Add some padding for easier clicking */
}
.user-menu-btn:hover {
    color: var(--text-color);
}
.avatar-small {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    object-fit: cover;
    border: 1px solid var(--border-color); /* Add a subtle border */
}
.user-menu-btn span {
    font-size: 0.875rem;
}
.user-menu-btn svg {
    opacity: 0.7;
}


/* Buttons */
.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 0.25rem;
  text-decoration: none;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s, border-color 0.2s, color 0.2s, opacity 0.2s;
  border: 1px solid transparent;
  text-align: center;
  vertical-align: middle;
  user-select: none;
  line-height: 1.5;
}

.btn:hover {
    text-decoration: none;
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
}

.btn-outline {
  background-color: transparent;
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.btn-outline:hover {
  background-color: var(--primary-color);
  color: white;
}

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

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

.btn-small {
    padding: 0.25rem 0.75rem; 
    font-size: 0.8rem;
    width: auto; 
    margin: 0.5rem auto; 
    display: block;
    min-width: 80px;
}

.btn.disabled,
.btn:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}

/* Hero Section */
.hero {
  padding: 4rem 0;
  text-align: center;
  background-color: var(--bg-white);
}

.hero h1 {
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.hero p {
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  color: var(--text-muted);
  font-size: 1.125rem;
}

.hero-buttons {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.hero-image {
  margin-top: 3rem;
  height: 300px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  background-color: var(--bg-light);
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Features Section */
.features {
  padding: 4rem 0;
  background-color: var(--bg-light);
}

.features h2 {
  text-align: center;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.feature-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1.5rem;
}

.feature-icon {
  width: 60px;
  height: 60px;
  background-color: rgba(0, 123, 255, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.feature-icon svg {
  color: var(--primary-color);
  width: 28px; /* Slightly larger icons */
  height: 28px;
}

/* How it Works */
.how-it-works {
  padding: 4rem 0;
  background-color: var(--bg-white);
}

.how-it-works h2 {
  text-align: center;
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1.5rem;
}

.step-icon {
  width: 60px;
  height: 60px;
  background-color: rgba(0, 123, 255, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.step-icon svg {
  color: var(--primary-color);
  width: 28px;
  height: 28px;
}

/* Pricing */
.pricing {
  padding: 4rem 0;
  background-color: var(--bg-light);
}

.pricing h2 {
  text-align: center;
}

.pricing-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.pricing-card {
  background-color: var(--bg-white);
  border-radius: 0.5rem;
  box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
  padding: 1.5rem;
  position: relative;
  display: flex;
  flex-direction: column;
}

.pricing-card.popular {
  border: 2px solid var(--primary-color);
}

.popular-badge {
  position: absolute;
  top: 0;
  right: 0;
  background-color: var(--primary-color);
  color: white;
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-bottom-left-radius: 0.25rem;
  border-top-right-radius: 0.25rem;
}

.pricing-header {
  margin-bottom: 1.5rem;
}

.price {
  font-size: 2rem;
  font-weight: 700;
  margin: 0.5rem 0;
  color: var(--text-color);
}

.price-description {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.features-list {
  list-style: none;
  margin-bottom: 1.5rem;
  flex-grow: 1; /* Make list grow */
}

.features-list li {
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  color: var(--text-color);
}

.features-list svg {
  color: var(--success-color);
  margin-right: 0.5rem;
  flex-shrink: 0;
}

.pricing-card .btn {
  width: 100%;
  text-align: center;
  margin-top: auto; /* Push button to bottom */
}

/* CTA Section */
.cta {
  padding: 4rem 0;
  text-align: center;
  background-color: rgba(0, 123, 255, 0.05);
}

.dark .cta {
  background-color: #2d3748;
}

/* Footer */
footer {
  background-color: var(--bg-light);
  padding: 2rem 0;
  text-align: center;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

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

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

.footer-links a:hover {
  color: var(--text-color);
}

/* Flash Messages / Alerts */
.flash-messages {
    margin-top: 1rem;
    margin-bottom: 1rem; /* Added margin below */
}
.alert {
  padding: 0.75rem 1.25rem;
  margin-bottom: 1rem;
  border: 1px solid transparent;
  border-radius: 0.25rem;
}
.alert-success { color: var(--success-hover); background-color: #d1e7dd; border-color: #badbcc; }
.alert-danger { color: var(--danger-hover); background-color: #f8d7da; border-color: #f5c2c7; }
.alert-warning { color: var(--warning-hover); background-color: #fff3cd; border-color: #ffecb5; }
.alert-info { color: var(--info-hover); background-color: #cff4fc; border-color: #b6effb; }

.dark .alert-success { color: #75b798; background-color: #051b11; border-color: #072b1a; }
.dark .alert-danger { color: #ea868f; background-color: #2c0b0e; border-color: #58151c; }
.dark .alert-warning { color: #ffda6a; background-color: #332701; border-color: #664d03; }
.dark .alert-info { color: #6edff6; background-color: #032830; border-color: #087990; }

/* Forms */
form {
    margin-top: 1.5rem;
}
fieldset {
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}
legend {
    font-weight: 600;
    padding: 0 0.5rem;
    color: var(--text-color);
}
label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}
input[type="text"],
input[type="file"],
input[type="number"],
select {
    display: block;
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text-color);
    background-color: var(--bg-white);
    background-clip: padding-box;
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
    margin-bottom: 1rem; /* Add margin below inputs */
}
input[type="file"] {
    padding: 0.375rem 0.75rem; /* Adjust padding for file input */
}
input:focus,
select:focus {
    border-color: var(--primary-color);
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* Tables */
table {
    width: 100%; 
    border-collapse: collapse; 
    margin-top: 1rem;
    margin-bottom: 1rem; /* Added */
    background-color: var(--bg-white); /* Ensure table background */
}
thead tr {
    border-bottom: 2px solid var(--border-color); 
    text-align: left;
}
th, td {
    padding: 0.75rem; /* Increased padding */
    vertical-align: top; /* Align top */
    border-bottom: 1px solid var(--border-color);
}
tbody tr:last-child td {
    border-bottom: none; /* Remove border from last row */
}
tbody tr:hover {
    background-color: rgba(0, 0, 0, 0.05);
}
.dark tbody tr:hover {
     background-color: rgba(255, 255, 255, 0.05);
}

/* Responsive */
@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  nav ul {
    display: none;
  }
  
  .mobile-controls {
    display: flex;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .hero-buttons .btn {
    width: 100%;
    max-width: 300px;
  }
  
  .footer-content {
    flex-direction: column;
    gap: 1rem;
  }
  
  .pricing-cards {
      grid-template-columns: 1fr; /* Stack pricing cards */
  }

  /* Hide Desktop Nav, Show Mobile Controls */
  .desktop-nav-wrapper {
      display: none;
  }
  .mobile-controls {
      display: flex; 
  }

  /* Mobile Nav Base Styles (still hidden initially by global rule) */
  .mobile-nav {
      /* display: none; is already set globally, so no need to repeat */
  }

  /* Ensure the mobile nav's UL is displayed when mobile-nav is active */
  /* This rule was missing or incorrect before */
  .mobile-nav ul {
      list-style: none;
      padding: 0;
      margin: 0;
      display: block; /* Explicitly set display for the UL */
  }

  /* Styles for items inside mobile nav (already adjusted for color) */
  .mobile-nav li {
    margin: 0.5rem 0;
    width: 100%; 
    text-align: center;
  }
  
  /* Explicitly set text colors for mobile nav items */
  /* Target links that are NOT buttons */
  .mobile-nav a:not(.btn) {
      display: block;
      width: 100%;
      padding: 0.75rem 1rem;
      text-align: center; 
      color: var(--primary-color); /* Use primary link color for non-button links */
      text-decoration: none;
  }
  .mobile-nav a:not(.btn):hover {
      color: var(--primary-hover);
      background-color: rgba(0, 0, 0, 0.05); /* Add subtle hover */
  }
  .dark .mobile-nav a:not(.btn):hover {
      background-color: rgba(255, 255, 255, 0.05);
  }

  .mobile-nav .dropdown-item-text {
      display: block;
      width: 100%;
      padding: 0.75rem 1rem;
      text-align: center; 
      color: var(--text-muted); /* Use muted color for info text */
  }
  
  /* Styles for buttons remain largely the same */
  .mobile-nav button, 
  .mobile-nav a.btn { /* Also target button links */
      display: block;
      width: auto; 
      padding: 0.75rem 1rem; 
      text-align: center; 
      margin-left: auto;
      margin-right: auto; 
      /* Text color is handled by .btn-* classes */
      text-decoration: none; /* Ensure no underline on button links */
  }
  .mobile-nav .btn {
      width: auto; 
      display: inline-block; 
      margin-top: 0.5rem; 
      margin-bottom: 0.5rem;
      /* Ensure proper styling for btn classes like btn-small */
  }

  .mobile-nav hr {
      border: none;
      border-top: 1px solid var(--border-color);
      margin: 0.5rem 0;
  }

  /* Show mobile nav container when body has the active class */
  body.mobile-nav-active .mobile-nav {
    display: block;
  }

  /* Other responsive rules */
  /* ... */
}