/* ==========================================================================
   SRT DRUGSTORE CLUB - DESIGN SYSTEM & CSS FRAMEWORK
   Modern Pharmacy Color Palette with Professional UX
   ========================================================================== */

:root {
  /* === Pharmacy Color Palette === */
  --primary-green: #2E7D32;
  --primary-green-light: #4CAF50;
  --primary-green-dark: #1B5E20;
  --secondary-blue: #1976D2;
  --secondary-blue-light: #42A5F5;
  --accent-teal: #00695C;
  --accent-teal-light: #4DB6AC;
  
  /* === Gradients === */
  --gradient-primary: linear-gradient(135deg, var(--primary-green) 0%, var(--primary-green-light) 100%);
  --gradient-secondary: linear-gradient(135deg, var(--secondary-blue) 0%, var(--secondary-blue-light) 100%);
  --gradient-accent: linear-gradient(135deg, var(--accent-teal) 0%, var(--accent-teal-light) 100%);
  --gradient-overlay: linear-gradient(135deg, rgba(46, 125, 50, 0.9) 0%, rgba(76, 175, 80, 0.9) 100%);
  
  /* === Neutral Colors === */
  --white: #FFFFFF;
  --gray-50: #FAFAFA;
  --gray-100: #F5F5F5;
  --gray-200: #EEEEEE;
  --gray-300: #E0E0E0;
  --gray-400: #BDBDBD;
  --gray-500: #9E9E9E;
  --gray-600: #757575;
  --gray-700: #616161;
  --gray-800: #424242;
  --gray-900: #212121;
  
  /* === Status Colors === */
  --success: #4CAF50;
  --warning: #FF9800;
  --error: #F44336;
  --info: #2196F3;
  
  /* === Shadows === */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.18);
  
  /* === Border Radius === */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 20px;
  
  /* === Spacing === */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  
  /* === Typography === */
  --font-family: 'Sarabun', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  
  /* === Transitions === */
  --transition-fast: 0.15s ease-in-out;
  --transition-base: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
  
  /* === Z-Index === */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */

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

*::before,
*::after {
  box-sizing: border-box;
}

html {
  line-height: 1.15;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--gray-800);
  background: linear-gradient(-45deg, #2E7D32, #4CAF50, #00BCD4, #3F51B5, #9C27B0, #E91E63);
  background-size: 400% 400%;
  animation: gradientShift 8s ease infinite;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   LAYOUT COMPONENTS
   ========================================================================== */

.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-container {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: var(--space-lg);
}

.content-wrapper {
  width: 100%;
  max-width: 450px; /* ลดขนาดอีกจาก 600px เป็น 450px */
  background: rgba(255, 255, 255, 0.95);
  border-radius: var(--radius-2xl);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  overflow: hidden;
  animation: fadeInUp 0.6s ease-out, float 6s ease-in-out infinite;
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  margin: 0 auto; /* จัดกึ่งกลาง */
}

/* ==========================================================================
   HEADER COMPONENT
   ========================================================================== */

.app-header {
  background: var(--gradient-primary);
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.app-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
  pointer-events: none;
}

.header-logo {
  max-width: 200px;
  height: auto;
  margin-bottom: var(--space-md);
  position: relative;
  z-index: 1;
}

.header-title {
  color: var(--white);
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  position: relative;
  z-index: 1;
}

.header-subtitle {
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--font-size-lg);
  font-weight: 400;
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   USER INFO COMPONENT
   ========================================================================== */

.user-info {
  background: var(--gradient-accent);
  padding: var(--space-lg);
  color: var(--white);
  display: none;
  position: relative;
  overflow: hidden;
}

.user-info::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 100px;
  height: 100px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  transform: translate(50%, -50%);
}

.user-info.show {
  display: block;
  animation: slideDown 0.4s ease-out;
}

.user-welcome {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  position: relative;
  z-index: 1;
}

.user-details {
  font-size: var(--font-size-sm);
  opacity: 0.9;
  margin-bottom: var(--space-md);
  position: relative;
  z-index: 1;
}

.user-role {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-xs);
  font-weight: 600;
  margin-left: var(--space-sm);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.user-role.admin {
  background: rgba(255, 215, 0, 0.9);
  color: var(--gray-800);
}

.logout-btn {
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: var(--white);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: var(--transition-base);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  position: relative;
  z-index: 1;
}

.logout-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-1px);
}

/* ==========================================================================
   NAVIGATION COMPONENT
   ========================================================================== */

.main-navigation {
  background: var(--white);
  padding: var(--space-lg);
  border-bottom: 1px solid var(--gray-200);
}

.nav-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--primary-green);
  margin-bottom: var(--space-md);
  text-align: center;
}

.breadcrumb {
  background: var(--gray-50);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  text-align: center;
}

.breadcrumb a {
  color: var(--primary-green);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--primary-green-dark);
}

.nav-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
}

.nav-button {
  display: block;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.nav-button button {
  width: 100%;
  background: var(--gradient-primary);
  color: var(--white);
  border: none;
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  font-family: var(--font-family);
  cursor: pointer;
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
}

.nav-button 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: var(--transition-slow);
}

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

.nav-button:hover button::before {
  left: 100%;
}

.nav-button.current button {
  background: var(--gradient-secondary);
  box-shadow: var(--shadow-md);
}

.nav-button.admin-only {
  display: none;
}

.nav-button.admin-only.show {
  display: block;
}

/* ==========================================================================
   CONTENT AREA
   ========================================================================== */

.content-area {
  padding: var(--space-2xl) var(--space-lg);
  min-height: 400px;
  position: relative;
  text-align: center; /* จัดให้ content อยู่กึ่งกลาง */
}

.page-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--primary-green);
  text-align: center;
  margin-bottom: var(--space-xl);
  position: relative;
}

.page-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
}

.page-subtitle {
  font-size: var(--font-size-lg);
  color: var(--gray-600);
  text-align: center;
  margin-bottom: var(--space-xl);
  line-height: 1.7;
}

/* ==========================================================================
   FORM COMPONENTS
   ========================================================================== */

.form-group {
  margin-bottom: var(--space-2xl);
  position: relative;
  text-align: center; /* จัดให้ content อยู่กึ่งกลาง */
}

.form-label {
  display: block;
  font-weight: 600;
  color: var(--primary-green-dark);
  margin-bottom: var(--space-md);
  font-size: var(--font-size-base);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  position: relative;
  text-align: center; /* จัดข้อความกึ่งกลาง */
  max-width: 320px;
  margin-left: auto;
  margin-right: auto;
}

.form-label::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%; /* จัดกึ่งกลาง */
  transform: translateX(-50%);
  width: 30px;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 1px;
}

.form-input {
  width: 100%;
  max-width: 320px; /* จำกัดความกว้างสูงสุด */
  margin: 0 auto; /* จัดกึ่งกลาง */
  padding: var(--space-md) var(--space-lg);
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-xl);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  transition: all var(--transition-base);
  background: rgba(255, 255, 255, 0.9);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  position: relative;
  display: block;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary-green);
  box-shadow: 0 0 0 4px rgba(46, 125, 50, 0.15), var(--shadow-md);
  transform: translateY(-2px);
  background: var(--white);
}

.form-input:hover {
  border-color: var(--primary-green-light);
  box-shadow: var(--shadow-md);
}

.form-input::placeholder {
  color: var(--gray-400);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md) var(--space-xl);
  border: none;
  border-radius: var(--radius-xl);
  font-size: var(--font-size-base);
  font-weight: 600;
  font-family: var(--font-family);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  position: relative;
  overflow: hidden;
  min-width: 140px;
  max-width: 320px; /* จำกัดความกว้าง */
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: var(--shadow-md);
  margin: 0 auto; /* จัดกึ่งกลาง */
}

.btn::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: var(--transition-slow);
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-xl);
  filter: brightness(110%);
}

.btn-secondary {
  background: var(--gradient-secondary);
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-xl);
  filter: brightness(110%);
}

.btn-outline {
  background: transparent;
  color: var(--primary-green);
  border: 2px solid var(--primary-green);
}

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

.btn-lg {
  padding: var(--space-lg) var(--space-2xl);
  font-size: var(--font-size-lg);
  min-width: 160px;
}

.btn-sm {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  min-width: 80px;
}

/* ==========================================================================
   OVERLAY & LOADING COMPONENTS
   ========================================================================== */

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  z-index: var(--z-modal-backdrop);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-base);
}

.overlay.show {
  opacity: 1;
  visibility: visible;
}

.overlay-content {
  background: var(--white);
  padding: var(--space-2xl);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  text-align: center;
  max-width: 400px;
  width: 90%;
  transform: scale(0.9);
  transition: var(--transition-base);
}

.overlay.show .overlay-content {
  transform: scale(1);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--gray-200);
  border-left: 4px solid var(--primary-green);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--space-md);
}

.status-message {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: var(--space-md);
}

.status-description {
  color: var(--gray-600);
  font-size: var(--font-size-base);
  line-height: 1.5;
}

/* ==========================================================================
   ANIMATIONS
   ========================================================================== */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */

@media (max-width: 768px) {
  .main-container {
    padding: var(--space-md);
  }
  
  .content-wrapper {
    max-width: 90%;
    margin: 0 auto;
  }
  
  .app-header {
    padding: var(--space-lg) var(--space-md);
  }
  
  .header-title {
    font-size: var(--font-size-2xl);
  }
  
  .header-subtitle {
    font-size: var(--font-size-base);
  }
  
  .nav-buttons {
    grid-template-columns: 1fr;
  }
  
  .content-area {
    padding: var(--space-xl) var(--space-md);
  }
  
  .page-title {
    font-size: var(--font-size-2xl);
  }
  
  .overlay-content {
    padding: var(--space-lg);
  }
  
  .form-input, .form-label {
    max-width: 100%;
  }
  
  .btn {
    max-width: 100%;
    font-size: var(--font-size-base);
    padding: var(--space-md) var(--space-lg);
  }
}

@media (max-width: 480px) {
  .main-container {
    padding: var(--space-sm);
  }
  
  .app-header {
    padding: var(--space-md);
  }
  
  .content-area {
    padding: var(--space-md);
  }
  
  .btn {
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--font-size-sm);
  }
}

/* ==========================================================================
   UTILITY CLASSES
   ========================================================================== */

.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

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

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

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-xs); }
.mb-2 { margin-bottom: var(--space-sm); }
.mb-3 { margin-bottom: var(--space-md); }
.mb-4 { margin-bottom: var(--space-lg); }
.mb-5 { margin-bottom: var(--space-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-xs); }
.mt-2 { margin-top: var(--space-sm); }
.mt-3 { margin-top: var(--space-md); }
.mt-4 { margin-top: var(--space-lg); }
.mt-5 { margin-top: var(--space-xl); }