/* ========================================
   CPR Educational Website - Global Styles
   ======================================== */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Sarabun:wght@300;400;600;700;800&family=Inter:wght@400;500;600;700&display=swap');

/* ========================================
   CSS Variables - Design Tokens
   ======================================== */
:root {
  /* Colors - Medical Emergency Palette */
  --color-emergency-red: #E31B23;
  --color-emergency-red-dark: #C41E3A;
  --color-emergency-red-light: #FF4757;

  --color-medical-blue: #0066CC;
  --color-medical-blue-light: #4A90E2;
  --color-medical-blue-lighter: #E3F2FD;

  --color-success-green: #00C853;
  --color-warning-orange: #FF6F00;

  /* Neutrals */
  --color-white: #FFFFFF;
  --color-gray-50: #F9FAFB;
  --color-gray-100: #F3F4F6;
  --color-gray-200: #E5E7EB;
  --color-gray-300: #D1D5DB;
  --color-gray-600: #4B5563;
  --color-gray-700: #374151;
  --color-gray-900: #111827;

  /* Typography */
  --font-thai: 'Sarabun', sans-serif;
  --font-numbers: 'Inter', sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

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

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-emergency: 9999;
}

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

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

body {
  font-family: var(--font-thai);
  color: var(--color-gray-900);
  background-color: var(--color-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Typography
   ======================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: 2.5rem;
  font-weight: 800;
}

h2 {
  font-size: 2rem;
  font-weight: 700;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
}

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

a:hover {
  color: var(--color-medical-blue-light);
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-md);
  z-index: var(--z-sticky);
  padding: var(--spacing-lg) 0;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-emergency-red);
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  margin-right: var(--spacing-2xl);
}

.logo-icon {
  font-size: 2rem;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-link {
  color: var(--color-gray-700);
  font-weight: 600;
  font-size: 1rem;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.nav-link:hover {
  background-color: var(--color-gray-100);
  color: var(--color-emergency-red);
}

.nav-link.active {
  background-color: var(--color-emergency-red);
  color: var(--color-white);
}

/* Emergency Button in Nav */
.nav-emergency-btn {
  background: var(--color-emergency-red);
  color: var(--color-white);
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 1rem;
  box-shadow: 0 2px 8px rgba(227, 27, 35, 0.4);
  border: 2px solid var(--color-emergency-red);
}

.nav-emergency-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(227, 27, 35, 0.5);
  background: var(--color-emergency-red-dark);
  border-color: var(--color-emergency-red-dark);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-gray-700);
}

/* ========================================
   Container & Layout
   ======================================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section {
  padding: var(--spacing-3xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-gray-600);
  max-width: 600px;
  margin: 0 auto;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, rgba(227, 27, 35, 0.95) 0%, rgba(74, 144, 226, 0.95) 100%);
  color: var(--color-white);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('../.gemini/antigravity/brain/5b285219-7079-4e98-b84a-3736db96eee9/hero_background_1768317619339.png');
  background-size: cover;
  background-position: center;
  opacity: 0.15;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: var(--spacing-lg);
  text-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-xl);
  opacity: 0.95;
  animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

.hero-stat {
  margin-top: var(--spacing-2xl);
  padding: var(--spacing-lg);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.2);
  animation: fadeInUp 0.8s ease-out 0.6s backwards;
}

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

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1.125rem;
  font-weight: 700;
  font-family: var(--font-thai);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  box-shadow: var(--shadow-md);
  min-width: 44px;
  min-height: 44px;
  justify-content: center;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-emergency-red) 0%, var(--color-emergency-red-dark) 100%);
  color: var(--color-white);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-emergency-red-dark) 0%, var(--color-emergency-red) 100%);
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-emergency-red);
  border: 2px solid var(--color-white);
}

.btn-secondary:hover {
  background: transparent;
  color: var(--color-white);
}

.btn-outline {
  background: transparent;
  color: var(--color-gray-700);
  border: 2px solid var(--color-gray-300);
}

.btn-outline:hover {
  background: var(--color-gray-900);
  color: var(--color-white);
  border-color: var(--color-gray-900);
}

.btn-large {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: 1.25rem;
}

.btn-icon {
  font-size: 1.25rem;
}

/* ========================================
   Cards
   ======================================== */
.card {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
  border: 1px solid var(--color-gray-200);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.card-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.card-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.card-text {
  color: var(--color-gray-600);
  line-height: 1.8;
}

/* ========================================
   Grid Systems
   ======================================== */
.grid {
  display: grid;
  gap: var(--spacing-xl);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* ========================================
   Steps Section
   ======================================== */
.steps-container {
  max-width: 900px;
  margin: 0 auto;
}

.step {
  display: flex;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
  padding: var(--spacing-xl);
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
  border-left: 4px solid var(--color-medical-blue);
}

.step:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-xl);
}

.step-number {
  flex-shrink: 0;
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--color-emergency-red) 0%, var(--color-emergency-red-dark) 100%);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  font-family: var(--font-numbers);
  box-shadow: 0 4px 12px rgba(227, 27, 35, 0.3);
}

.step-content {
  flex: 1;
}

.step-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--color-gray-900);
}

.step-description {
  color: var(--color-gray-600);
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
}

.step-image {
  margin-top: var(--spacing-md);
  border-radius: var(--radius-lg);
  max-width: 100%;
  height: auto;
  box-shadow: var(--shadow-md);
}

/* ========================================
   Do's and Don'ts
   ======================================== */
.dos-donts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.do-item,
.dont-item {
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
}

.do-item {
  background: linear-gradient(135deg, rgba(0, 200, 83, 0.1) 0%, rgba(0, 200, 83, 0.05) 100%);
  border-left: 4px solid var(--color-success-green);
}

.dont-item {
  background: linear-gradient(135deg, rgba(227, 27, 35, 0.1) 0%, rgba(227, 27, 35, 0.05) 100%);
  border-left: 4px solid var(--color-emergency-red);
}

.do-icon,
.dont-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.do-icon {
  color: var(--color-success-green);
}

.dont-icon {
  color: var(--color-emergency-red);
}

/* ========================================
   Quiz Styles
   ======================================== */
.quiz-container {
  max-width: 700px;
  margin: 0 auto;
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-2xl);
}

.quiz-progress {
  height: 8px;
  background: var(--color-gray-200);
  border-radius: var(--radius-full);
  margin-bottom: var(--spacing-xl);
  overflow: hidden;
}

.quiz-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-medical-blue) 0%, var(--color-medical-blue-light) 100%);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

.quiz-question {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xl);
  color: var(--color-gray-900);
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.quiz-option {
  padding: var(--spacing-lg);
  background: var(--color-gray-50);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 1.125rem;
}

.quiz-option:hover {
  background: var(--color-gray-100);
  border-color: var(--color-medical-blue);
  transform: translateX(4px);
}

.quiz-option.selected {
  background: var(--color-medical-blue-lighter);
  border-color: var(--color-medical-blue);
}

.quiz-option.correct {
  background: rgba(0, 200, 83, 0.1);
  border-color: var(--color-success-green);
}

.quiz-option.incorrect {
  background: rgba(227, 27, 35, 0.1);
  border-color: var(--color-emergency-red);
}

/* ========================================
   Emergency Mode
   ======================================== */
#emergency-mode {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-emergency-red);
  color: var(--color-white);
  z-index: var(--z-emergency);
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-xl);
}

#emergency-mode.active {
  display: flex;
}

.emergency-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.emergency-title {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.emergency-step {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xl);
  text-align: center;
  max-width: 800px;
  line-height: 1.4;
}

.beat-indicator {
  width: 120px;
  height: 120px;
  background: var(--color-white);
  border-radius: 50%;
  margin: var(--spacing-xl) auto;
  transition: all var(--transition-fast);
  box-shadow: 0 0 30px rgba(255, 255, 255, 0.5);
}

.beat-indicator.pulse {
  transform: scale(1.3);
  box-shadow: 0 0 60px rgba(255, 255, 255, 0.8);
}

.compression-count {
  font-size: 4rem;
  font-weight: 800;
  font-family: var(--font-numbers);
  margin: var(--spacing-xl) 0;
  text-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.emergency-controls {
  display: flex;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.btn-emergency-call {
  background: var(--color-white);
  color: var(--color-emergency-red);
  font-size: 1.5rem;
  padding: var(--spacing-lg) var(--spacing-2xl);
}

.btn-emergency-close {
  background: transparent;
  color: var(--color-white);
  border: 2px solid var(--color-white);
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--color-gray-900);
  color: var(--color-white);
  padding: var(--spacing-2xl) 0;
  margin-top: var(--spacing-3xl);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.footer-link {
  color: var(--color-gray-300);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-white);
}

.footer-text {
  color: var(--color-gray-300);
  font-size: 0.875rem;
}

.footer-disclaimer {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.875rem;
  color: var(--color-gray-300);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {

  /* Typography adjustments */
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .hero-subtitle {
    font-size: 1.125rem;
  }

  /* Navigation */
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: var(--color-white);
    flex-direction: column;
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
    transition: left var(--transition-base);
  }

  .nav-menu.active {
    left: 0;
  }

  .menu-toggle {
    display: block;
  }

  /* Hero buttons */
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .hero-buttons .btn {
    width: 100%;
    max-width: 300px;
  }

  /* Steps */
  .step {
    flex-direction: column;
    text-align: center;
  }

  .step-number {
    margin: 0 auto;
  }

  /* Emergency Mode */
  .emergency-title {
    font-size: 2rem;
  }

  .emergency-step {
    font-size: 1.5rem;
  }

  .compression-count {
    font-size: 3rem;
  }

  .emergency-controls {
    flex-direction: column;
    width: 100%;
  }

  .emergency-controls .btn {
    width: 100%;
  }

  /* Spacing adjustments */
  .section {
    padding: var(--spacing-2xl) 0;
  }

  .container {
    padding: 0 var(--spacing-md);
  }
}

/* ========================================
   Utility Classes
   ======================================== */
.text-center {
  text-align: center;
}

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

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

.mt-sm {
  margin-top: var(--spacing-sm);
}

.mt-md {
  margin-top: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mt-xl {
  margin-top: var(--spacing-xl);
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

.mb-md {
  margin-bottom: var(--spacing-md);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.mb-xl {
  margin-bottom: var(--spacing-xl);
}

.hidden {
  display: none;
}

.visible {
  display: block;
}

/* ========================================
   Animations
   ======================================== */
@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-50px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease-out;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}