/* ==========================================================================
   PREMIUM CORE BASE STYLING SYSTEM - Healthcare HEALTHCARE
   Vanilla CSS Design Tokens, Light/Dark Modes, Header, Footer & Global Widgets
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

/* --- Design Tokens & Color Palettes --- */
:root {
  --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  /* Light Theme Palette (Premium Medical Teal) */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  
  --primary: #1e5c7b;
  --primary-rgb: 30, 92, 123;
  --primary-hover: #16465f;
  --secondary: #0ea5e9;
  --secondary-rgb: 14, 165, 233;
  --accent: #f43f5e;
  
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --text-on-primary: #ffffff;
  
  --border-color: #e2e8f0;
  --border-focus: #38bdf8;
  
  --card-shadow: 0 10px 30px -10px rgba(30, 92, 123, 0.08);
  --hover-shadow: 0 20px 40px -15px rgba(30, 92, 123, 0.15);
  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-border: rgba(255, 255, 255, 0.5);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme Overrides */
[data-theme="dark"] {
  --bg-primary: #090f1d;
  --bg-secondary: #111a2e;
  --bg-tertiary: #1b263b;
  
  --primary: #38bdf8;
  --primary-rgb: 56, 189, 248;
  --primary-hover: #7dd3fc;
  --secondary: #0ea5e9;
  --secondary-rgb: 14, 165, 233;
  
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-light: #64748b;
  
  --border-color: #1e293b;
  --border-focus: #38bdf8;
  
  --card-shadow: 0 10px 35px -12px rgba(0, 0, 0, 0.5);
  --hover-shadow: 0 25px 50px -15px rgba(56, 189, 248, 0.15);
  --glass-bg: rgba(17, 26, 46, 0.8);
  --glass-border: rgba(255, 255, 255, 0.05);
}

/* --- Core Reset & Styles --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border: 0;
  outline: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

ul {
  list-style: none;
}

/* --- Typography Helpers --- */
.h1, .h2, .h3, .h4 {
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Header & Navigation --- */
.site-header {
  position: sticky;
  top: 0;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  z-index: 1000;
  transition: background var(--transition-normal), border-color var(--transition-normal);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.logo i {
  font-size: 1.8rem;
  color: var(--secondary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-muted);
  position: relative;
  padding: 6px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary);
  transition: width var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* --- Theme Toggle & Action Controls --- */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.theme-toggle-btn {
  background: var(--bg-tertiary);
  color: var(--text-main);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
  cursor: pointer;
  font-size: 1.2rem;
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.theme-toggle-btn:hover {
  transform: translateY(-2px);
  background-color: var(--border-color);
}

.theme-toggle-btn .fa-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle-btn .fa-moon {
  display: none;
}

[data-theme="dark"] .theme-toggle-btn .fa-sun {
  display: block;
  color: #fbbf24;
}

/* --- Breadcrumb Page Header --- */
.hero-breadcrumb-section {
  background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.05) 0%, rgba(14, 165, 233, 0.08) 100%);
  padding: 60px 0;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.hero-breadcrumb-section h1 {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: 12px;
}

.breadcrumb-list {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.breadcrumb-list a {
  color: var(--text-light);
}

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

.breadcrumb-separator {
  color: var(--text-light);
  font-size: 0.8rem;
}

/* --- Core Sections Styling --- */
.section-wrapper {
  padding: 80px 0;
}

/* --- Floating Utilities --- */

/* Scroll to Top */
.back-to-top-widget {
  position: fixed;
  bottom: 100px;
  right: 28px;
  width: 48px;
  height: 48px;
  background-color: var(--secondary);
  color: #fff;
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px);
  z-index: 99;
  transition: opacity var(--transition-normal), transform var(--transition-normal), background-color var(--transition-fast);
}

.back-to-top-widget.visible {
  opacity: 1;
  pointer-events: all;
  transform: translateY(0);
}

.back-to-top-widget:hover {
  background-color: var(--primary);
  transform: translateY(-4px);
}

/* Chat Widget System */
.floating-chat-trigger {
  position: fixed;
  bottom: 28px;
  right: 28px;
  background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
  color: #fff;
  padding: 14px 22px;
  border-radius: var(--radius-full);
  box-shadow: 0 8px 24px rgba(14, 165, 233, 0.4);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 0.95rem;
  z-index: 100;
  user-select: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.floating-chat-trigger:hover {
  transform: scale(1.05) translateY(-2px);
  box-shadow: 0 12px 30px rgba(14, 165, 233, 0.5);
}

.floating-chat-trigger .chat-pulse-indicator {
  width: 8px;
  height: 8px;
  background-color: #22c55e;
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.7);
  animation: pulseGreen 1.6s infinite;
}

@keyframes pulseGreen {
  0% { transform: scale(0.9); box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(34, 197, 94, 0); }
  100% { transform: scale(0.9); box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); }
}

/* Interactive Chat Window panel */
.mock-chat-window-panel {
  position: fixed;
  bottom: 96px;
  right: 28px;
  width: 380px;
  height: 500px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: 0 15px 45px -10px rgba(0, 0, 0, 0.25);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 101;
  opacity: 0;
  pointer-events: none;
  transform: translateY(30px) scale(0.95);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.mock-chat-window-panel.open {
  opacity: 1;
  pointer-events: all;
  transform: translateY(0) scale(1);
}

.chat-panel-header {
  background: var(--primary);
  color: #fff;
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chat-partner-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.chat-partner-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.2);
  display: grid;
  place-items: center;
  font-size: 1.2rem;
  font-weight: 800;
}

.chat-partner-details h4 {
  font-size: 0.95rem;
  font-weight: 700;
}

.chat-partner-details span {
  font-size: 0.75rem;
  opacity: 0.8;
  display: flex;
  align-items: center;
  gap: 4px;
}

.chat-partner-details span::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #22c55e;
}

.chat-close-btn {
  background: transparent;
  color: #fff;
  font-size: 1.1rem;
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.chat-close-btn:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.chat-messages-area {
  flex-grow: 1;
  padding: 20px;
  overflow-y: auto;
  background-color: var(--bg-primary);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.chat-message-bubble {
  max-width: 80%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  line-height: 1.4;
  animation: messageSlide 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.chat-message-bubble.incoming {
  background-color: var(--bg-secondary);
  color: var(--text-main);
  align-self: flex-start;
  border-bottom-left-radius: 2px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.chat-message-bubble.outgoing {
  background-color: var(--primary);
  color: var(--text-on-primary);
  align-self: flex-end;
  border-bottom-right-radius: 2px;
}

/* Typing indicator */
.typing-dots {
  display: flex;
  gap: 4px;
  align-items: center;
  height: 12px;
}

.typing-dots span {
  width: 6px;
  height: 6px;
  background-color: var(--text-light);
  border-radius: 50%;
  animation: typingBounce 1.4s infinite ease-in-out both;
}

.typing-dots span:nth-child(1) { animation-delay: -0.32s; }
.typing-dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes typingBounce {
  0%, 80%, 100% { transform: scale(0); }
  40% { transform: scale(1.0); }
}

.chat-input-area {
  padding: 16px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  display: flex;
  gap: 10px;
}

.chat-input-field {
  flex-grow: 1;
  padding: 10px 16px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  border-radius: var(--radius-full);
  color: var(--text-main);
  font-family: var(--font-main);
  font-size: 0.9rem;
}

.chat-input-field:focus {
  border-color: var(--border-focus);
  background-color: var(--bg-secondary);
}

.chat-send-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--primary);
  color: #fff;
  display: grid;
  place-items: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.chat-send-btn:hover {
  background-color: var(--primary-hover);
  transform: scale(1.05);
}

/* --- Sliding Toast Alerts --- */
.toast-container {
  position: fixed;
  top: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 9999;
  pointer-events: none;
}

.premium-toast-alert {
  pointer-events: all;
  background-color: var(--bg-secondary);
  color: var(--text-main);
  padding: 16px 24px;
  border-radius: var(--radius-sm);
  border-left: 6px solid var(--primary);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 320px;
  max-width: 450px;
  animation: toastSlideIn 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.premium-toast-alert.fade-out {
  opacity: 0;
  transform: translateX(50px) scale(0.9);
}

@keyframes toastSlideIn {
  from { opacity: 0; transform: translateX(100px); }
  to { opacity: 1; transform: translateX(0); }
}

.premium-toast-alert.success { border-left-color: #22c55e; }
.premium-toast-alert.error { border-left-color: var(--accent); }
.premium-toast-alert.info { border-left-color: var(--secondary); }

.toast-icon {
  font-size: 1.4rem;
}

.premium-toast-alert.success .toast-icon { color: #22c55e; }
.premium-toast-alert.error .toast-icon { color: var(--accent); }
.premium-toast-alert.info .toast-icon { color: var(--secondary); }

.toast-message {
  font-size: 0.95rem;
  font-weight: 600;
  flex-grow: 1;
}

.toast-close-icon {
  font-size: 0.9rem;
  color: var(--text-light);
  cursor: pointer;
  padding: 4px;
  transition: color var(--transition-fast);
}

.toast-close-icon:hover {
  color: var(--text-main);
}

/* --- Responsive Adaptability Matrix --- */
@media (max-width: 768px) {
  .header-container {
    height: 70px;
  }
  
  .nav-links {
    display: none; /* Collapsed nav links or hamburger menu can be loaded here */
  }
  
  .hero-breadcrumb-section {
    padding: 40px 0;
  }
  
  .hero-breadcrumb-section h1 {
    font-size: 2rem;
  }
  
  .section-wrapper {
    padding: 50px 0;
  }
  
  .mock-chat-window-panel {
    width: calc(100vw - 32px);
    right: 16px;
    bottom: 84px;
  }
  
  .floating-chat-trigger {
    right: 16px;
    bottom: 16px;
  }
  
  .back-to-top-widget {
    right: 16px;
    bottom: 84px;
  }
}