/* CSS Custom Properties (Variables) */
:root {
  /* Colors - YouTube inspired */
  --primary-red: #FF0000;
  --primary-red-dark: #CC0000;
  --primary-red-light: #FF3333;
  --dark-gray: #0F0F0F;
  --medium-gray: #606060;
  --light-gray: #F9F9F9;
  --white: #FFFFFF;
  --border-light: #E5E5E5;
  --shadow-light: rgba(0, 0, 0, 0.1);
  --shadow-medium: rgba(0, 0, 0, 0.15);
  --shadow-dark: rgba(0, 0, 0, 0.25);
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 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;
  --font-size-5xl: 3rem;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
  
  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-bounce: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--dark-gray);
  background-color: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* Section Headers */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-4xl);
}

.section-header h2 {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--dark-gray);
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
}

.section-header p {
  font-size: var(--font-size-lg);
  color: var(--medium-gray);
  max-width: 600px;
  margin: 0 auto;
}

/* Buttons */
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--radius-lg);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-bounce);
  position: relative;
  overflow: hidden;
  min-height: 48px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-red), var(--primary-red-dark));
  color: var(--white);
  box-shadow: 0 4px 12px rgba(255, 0, 0, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 0, 0, 0.4);
  background: linear-gradient(135deg, var(--primary-red-light), var(--primary-red));
}

.btn-secondary {
  background: var(--white);
  color: var(--dark-gray);
  border: 2px solid var(--border-light);
  box-shadow: 0 2px 8px var(--shadow-light);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px var(--shadow-medium);
  border-color: var(--primary-red);
  color: var(--primary-red);
}

.btn-loader {
  display: none;
}

.btn-primary.loading .btn-text {
  opacity: 0;
}

.btn-primary.loading .btn-loader {
  display: block;
  position: absolute;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
  z-index: 1000;
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 2px 20px var(--shadow-light);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--dark-gray);
  text-decoration: none;
}

.nav-logo i {
  color: var(--primary-red);
  font-size: var(--font-size-2xl);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-2xl);
}

.nav-link {
  color: var(--medium-gray);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-normal);
  position: relative;
}

.nav-link:hover {
  color: var(--primary-red);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-red);
  transition: width var(--transition-normal);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 4px;
}

.nav-toggle .bar {
  width: 24px;
  height: 3px;
  background: var(--dark-gray);
  border-radius: 2px;
  transition: all var(--transition-normal);
}

/* Hero Section */
.hero {
  padding: 140px 0 var(--spacing-4xl);
  background: linear-gradient(135deg, #FAFAFA 0%, #F5F5F5 100%);
  position: relative;
  overflow: hidden;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4xl);
  align-items: center;
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 700;
  line-height: 1.1;
  color: var(--dark-gray);
  margin-bottom: var(--spacing-lg);
}

.hero-title .highlight {
  color: var(--primary-red);
  position: relative;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--medium-gray);
  margin-bottom: var(--spacing-2xl);
  line-height: 1.7;
}

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

.feature-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  color: var(--medium-gray);
  font-weight: 500;
}

.feature-item i {
  color: var(--primary-red);
  font-size: var(--font-size-lg);
  width: 20px;
}

/* Form Card */
.form-card {
  background: var(--white);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-2xl);
  box-shadow: 0 20px 40px var(--shadow-light);
  border: 1px solid var(--border-light);
  position: relative;
}

.form-card h3 {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--dark-gray);
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

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

.form-group label {
  display: block;
  font-weight: 500;
  color: var(--dark-gray);
  margin-bottom: var(--spacing-sm);
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-wrapper i {
  position: absolute;
  left: var(--spacing-md);
  color: var(--medium-gray);
  z-index: 1;
}

.input-wrapper input {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 2.5rem;
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  transition: all var(--transition-normal);
  background: var(--white);
}

.input-wrapper input:focus {
  outline: none;
  border-color: var(--primary-red);
  box-shadow: 0 0 0 3px rgba(255, 0, 0, 0.1);
}

.error-message {
  display: block;
  color: var(--primary-red);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
  min-height: 20px;
}

/* New Standard Checkbox Styles */
.checkbox-group-standard {
  display: flex; /* Align checkbox and label on the same line */
  align-items: center; /* Vertically center them */
  margin-bottom: var(--spacing-xl);
  gap: var(--spacing-sm); /* Space between checkbox and label */
}

.standard-checkbox {
  /* Default browser checkbox appearance will be used. */
  /* We can add some margin if needed, but flex gap should handle spacing. */
  /* For custom appearance, more complex styling would be needed, */
  /* but the goal here is reliable layout. */
  margin: 0; /* Reset any default browser margins on the input itself */
  width: auto; /* Override any global input styling that might affect width */
  padding: 0; /* Override any global input styling that might affect padding */
  /* vertical-align is not needed for flex items when parent has align-items */
}

.standard-checkbox-label {
  font-size: var(--font-size-sm);
  color: var(--medium-gray);
  cursor: pointer;
  /* No need for display: block from .form-group label as it's now a direct label */
  margin-bottom: 0; /* Override .form-group label margin-bottom if it was inheriting */
  font-weight: normal; /* Override .form-group label font-weight if it was inheriting */
  line-height: 1.2; /* Adjusted for better perceived vertical centering */
  padding-top: 6px; /* Nudge text down for better alignment with checkbox */
  /* vertical-align is not needed for flex items when parent has align-items */
}

.success-message {
  display: none;
  text-align: center;
  padding: var(--spacing-xl);
  background: linear-gradient(135deg, #F0FDF4, #DCFCE7);
  border-radius: var(--radius-lg);
  border: 1px solid #BBF7D0;
}

.success-message.show {
  display: block;
}

.success-message i {
  color: #16A34A;
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-md);
}

.success-message h4 {
  color: #15803D;
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.success-message p {
  color: #166534;
  font-size: var(--font-size-sm);
}

/* Hero Background */
.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  overflow: hidden;
}

.bg-shape {
  position: absolute;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(255, 0, 0, 0.05), rgba(255, 0, 0, 0.02));
}

.shape-1 {
  width: 300px;
  height: 300px;
  top: -150px;
  right: -150px;
  animation: float 6s ease-in-out infinite;
}

.shape-2 {
  width: 200px;
  height: 200px;
  bottom: -100px;
  left: -100px;
  animation: float 8s ease-in-out infinite reverse;
}

.shape-3 {
  width: 150px;
  height: 150px;
  top: 50%;
  right: 10%;
  animation: float 10s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(180deg); }
}

/* Benefits Section */
.benefits {
  padding: var(--spacing-4xl) 0;
  background: var(--white);
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-2xl);
}

.benefit-card {
  text-align: center;
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  background: var(--white);
  border: 1px solid var(--border-light);
  transition: all var(--transition-bounce);
  position: relative;
  overflow: hidden;
}

.benefit-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-red), var(--primary-red-light));
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.benefit-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px var(--shadow-medium);
}

.benefit-card:hover::before {
  transform: scaleX(1);
}

.benefit-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--spacing-lg);
  background: linear-gradient(135deg, var(--primary-red), var(--primary-red-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: var(--font-size-2xl);
}

.benefit-card h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--dark-gray);
  margin-bottom: var(--spacing-md);
}

.benefit-card p {
  color: var(--medium-gray);
  line-height: 1.7;
}

/* How It Works Section */
.how-it-works {
  padding: var(--spacing-4xl) 0;
  background-image: url('../assets/summarizeit-bg.jpeg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  position: relative;
}

.how-it-works::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.7);
  z-index: 1;
}

.how-it-works .container {
  position: relative;
  z-index: 2;
}

.how-it-works .section-header h2 {
  color: var(--dark-gray);
}

.how-it-works .section-header p {
  color: var(--medium-gray);
}

.steps-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xl);
  max-width: 900px;
  margin: 0 auto;
}

.step {
  flex: 1;
  text-align: center;
  position: relative;
}

.step-number {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary-red), var(--primary-red-dark));
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin: 0 auto var(--spacing-lg);
  box-shadow: 0 8px 20px rgba(255, 0, 0, 0.3);
}

.step-content h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--dark-gray);
  margin-bottom: var(--spacing-sm);
}

.step-content p {
  color: var(--medium-gray);
  font-size: var(--font-size-sm);
  line-height: 1.6;
}

.step-icon {
  margin-top: var(--spacing-lg);
  color: var(--primary-red);
  font-size: var(--font-size-2xl);
}

.step-connector {
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-red), var(--primary-red-light));
  position: relative;
  margin: 0 var(--spacing-md);
}

.step-connector::after {
  content: '';
  position: absolute;
  right: -6px;
  top: -4px;
  width: 0;
  height: 0;
  border-left: 8px solid var(--primary-red-light);
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
}

/* FAQ Section */
.faq {
  padding: var(--spacing-4xl) 0;
  background: var(--white);
}

.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-md);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.faq-item:hover {
  box-shadow: 0 4px 12px var(--shadow-light);
}

.faq-question {
  padding: var(--spacing-xl);
  background: var(--white);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

.faq-question:hover {
  background: var(--light-gray);
}

.faq-question h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--dark-gray);
  margin: 0;
}

.faq-question i {
  color: var(--primary-red);
  transition: transform var(--transition-normal);
}

.faq-item.active .faq-question i {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 var(--spacing-xl);
  background: var(--light-gray);
  max-height: 0;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.faq-item.active .faq-answer {
  padding: var(--spacing-xl);
  max-height: 200px;
}

.faq-answer p {
  color: var(--medium-gray);
  line-height: 1.7;
  margin: 0;
}

/* Footer */
.footer {
  background: var(--dark-gray);
  color: var(--white);
  padding: var(--spacing-4xl) 0 var(--spacing-xl);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--spacing-4xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.footer-logo i {
  color: var(--primary-red);
  font-size: var(--font-size-2xl);
}

.footer-brand p {
  color: var(--medium-gray);
  line-height: 1.7;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-2xl);
}

.footer-section h4 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  color: var(--white);
}

.footer-section a {
  display: block;
  color: var(--medium-gray);
  text-decoration: none;
  margin-bottom: var(--spacing-sm);
  transition: color var(--transition-normal);
}

.footer-section a:hover {
  color: var(--primary-red);
}

.footer-section a i {
  margin-right: var(--spacing-sm);
  width: 16px;
}

.footer-bottom {
  border-top: 1px solid #333;
  padding-top: var(--spacing-xl);
  text-align: center;
  color: var(--medium-gray);
  font-size: var(--font-size-sm);
}

/* Utility Classes */
.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(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.hidden { display: none; }
.visible { display: block; }

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

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

.animate-fade-in {
  animation: fadeIn 0.6s ease-out;
}

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

.scroll-animate.in-view {
  opacity: 1;
  transform: translateY(0);
}