/* ===========================
   ChurnZap Website Styles
   Following Brand Guide v1.0
   =========================== */

/* CSS Variables - From Brand Guide Section 8 */
:root {
  /* Brand Colors */
  --color-purple: #8B5CF6;
  --color-navy: #1E293B;
  --color-cyan: #06B6D4;

  /* Neutrals */
  --color-gray: #9CA3AF;
  --color-white: #FFFFFF;
  --color-black: #111827;
  --color-border: #E5E7EB;
  --color-light-bg: #F3F4F6;

  /* Semantic Colors */
  --color-primary: var(--color-purple);
  --color-text: var(--color-black);
  --color-text-muted: var(--color-gray);
  --color-background: var(--color-white);

  /* Success/Alert */
  --color-success: #10B981;
  --color-purple-light: #F5F3FF;
  --color-purple-dark: #7C3AED;

  /* Font Families */
  --font-display: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Font Sizes */
  --text-h1: 56px;
  --text-h2: 40px;
  --text-h3: 28px;
  --text-h4: 20px;
  --text-h5: 18px;
  --text-body-lg: 18px;
  --text-body: 16px;
  --text-body-sm: 14px;
  --text-caption: 13px;

  /* Font Weights */
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;
  --weight-extrabold: 800;

  /* Line Heights */
  --leading-tight: 1.1;
  --leading-snug: 1.3;
  --leading-normal: 1.5;
  --leading-relaxed: 1.6;

  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-2xl: 64px;
  --spacing-3xl: 96px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: var(--weight-regular);
  font-size: var(--text-body);
  line-height: var(--leading-relaxed);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography - From Brand Guide Section 3 */
h1, .h1 {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--text-h1);
  line-height: var(--leading-tight);
  letter-spacing: -0.02em;
  color: var(--color-navy);
}

h2, .h2 {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--text-h2);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--color-navy);
}

h3, .h3 {
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  font-size: var(--text-h3);
  line-height: var(--leading-snug);
  color: var(--color-navy);
}

h4, .h4 {
  font-family: var(--font-body);
  font-weight: var(--weight-semibold);
  font-size: var(--text-h4);
  line-height: 1.4;
  color: var(--color-navy);
}

h5, .h5 {
  font-family: var(--font-body);
  font-weight: var(--weight-semibold);
  font-size: var(--text-h5);
  line-height: 1.4;
  color: var(--color-navy);
}

p {
  font-family: var(--font-body);
  font-weight: var(--weight-regular);
  font-size: var(--text-body);
  line-height: var(--leading-relaxed);
  color: var(--color-text);
}

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

/* Navigation */
.nav {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

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

.logo {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: 24px;
  color: var(--color-purple);
  text-decoration: none;
  transition: opacity 0.2s ease;
  display: inline-block;
}

.logo:hover {
  opacity: 0.85;
}

.logo-image {
  height: 32px;
  width: auto;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-links a {
  font-family: var(--font-body);
  font-weight: var(--weight-medium);
  font-size: var(--text-body);
  color: var(--color-navy);
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--color-purple);
}

/* Buttons - From Brand Guide Examples */
.btn-primary {
  display: inline-block;
  background: var(--color-purple);
  color: var(--color-white);
  font-family: var(--font-body);
  font-weight: var(--weight-medium);
  font-size: var(--text-body);
  padding: 16px 32px;
  border-radius: 8px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.1s ease;
  letter-spacing: 0.01em;
}

.btn-primary:hover {
  background: var(--color-purple-dark);
  transform: translateY(-1px);
}

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

.btn-secondary {
  display: inline-block;
  background: var(--color-white);
  color: var(--color-purple);
  font-family: var(--font-body);
  font-weight: var(--weight-medium);
  font-size: var(--text-body);
  padding: 16px 32px;
  border-radius: 8px;
  text-decoration: none;
  border: 2px solid var(--color-purple);
  cursor: pointer;
  transition: background 0.2s ease, transform 0.1s ease;
  letter-spacing: 0.01em;
}

.btn-secondary:hover {
  background: var(--color-purple-light);
  transform: translateY(-1px);
}

.btn-secondary-small {
  display: inline-block;
  background: var(--color-purple);
  color: var(--color-white);
  font-family: var(--font-body);
  font-weight: var(--weight-medium);
  font-size: var(--text-body-sm);
  padding: 10px 20px;
  border-radius: 6px;
  text-decoration: none;
  border: none;
  transition: background 0.2s ease;
}

.btn-secondary-small:hover {
  background: var(--color-purple-dark);
}

.btn-full {
  width: 100%;
}

/* Hero Section - From Brand Guide Example 1 */
.hero {
  background: var(--color-white);
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  margin-bottom: var(--spacing-md);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-subheadline {
  font-size: var(--text-h4);
  line-height: var(--leading-relaxed);
  color: var(--color-black);
  margin-bottom: var(--spacing-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  margin-bottom: var(--spacing-2xl);
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: var(--spacing-xl);
  justify-content: center;
  margin-top: var(--spacing-2xl);
  flex-wrap: wrap;
}

.stat {
  text-align: center;
}

.stat-number {
  font-family: var(--font-body);
  font-weight: var(--weight-bold);
  font-size: 48px;
  color: var(--color-purple);
  line-height: 1;
}

.stat-label {
  font-size: var(--text-body-sm);
  color: var(--color-gray);
  margin-top: var(--spacing-xs);
}

/* Problem Section */
.problem {
  background: var(--color-light-bg);
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.problem h2 {
  margin-bottom: var(--spacing-sm);
}

.section-intro {
  font-size: var(--text-body-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-text);
  max-width: 680px;
  margin: 0 auto var(--spacing-xl) auto;
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  max-width: 900px;
  margin: 0 auto;
}

.problem-card {
  background: var(--color-white);
  padding: var(--spacing-lg);
  border-radius: 12px;
  border: 1px solid var(--color-border);
  text-align: left;
}

.problem-card.highlight {
  border: 2px solid var(--color-purple);
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.15);
}

.problem-icon {
  font-size: 40px;
  margin-bottom: var(--spacing-sm);
}

.problem-card h3 {
  margin-bottom: var(--spacing-sm);
  font-size: var(--text-h4);
}

.problem-card p {
  color: var(--color-text);
}

/* Features Section */
.features {
  background: var(--color-white);
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.features h2 {
  margin-bottom: var(--spacing-sm);
}

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

.feature-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: var(--spacing-lg);
  text-align: left;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.feature-number {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: 48px;
  color: var(--color-purple);
  opacity: 0.2;
  line-height: 1;
  margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
  margin-bottom: var(--spacing-sm);
  font-size: var(--text-h4);
}

.feature-card p {
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.feature-list {
  list-style: none;
  margin-top: var(--spacing-sm);
}

.feature-list li {
  font-size: var(--text-body-sm);
  color: var(--color-gray);
  padding-left: 24px;
  position: relative;
  margin-bottom: 6px;
}

.feature-list li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-purple);
  font-weight: var(--weight-bold);
}

/* How It Works Section */
.how-it-works {
  background: var(--color-navy);
  padding: var(--spacing-3xl) 0;
  text-align: center;
  color: var(--color-white);
}

.how-it-works h2 {
  color: var(--color-white);
  margin-bottom: var(--spacing-sm);
}

.how-it-works .section-intro {
  color: var(--color-light-bg);
}

.steps {
  max-width: 800px;
  margin: var(--spacing-xl) auto 0;
  text-align: left;
}

.step {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  align-items: flex-start;
}

.step-number {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: 72px;
  color: var(--color-purple);
  line-height: 1;
  min-width: 80px;
}

.step-content h3 {
  color: var(--color-white);
  margin-bottom: var(--spacing-xs);
}

.step-content p {
  color: var(--color-light-bg);
  line-height: var(--leading-relaxed);
}

/* Target Audience Section */
.target-audience {
  background: var(--color-white);
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.target-audience h2 {
  margin-bottom: var(--spacing-xl);
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  max-width: 1000px;
  margin: 0 auto;
}

.audience-card {
  background: var(--color-light-bg);
  padding: var(--spacing-lg);
  border-radius: 12px;
  text-align: left;
}

.audience-card h4 {
  color: var(--color-purple);
  margin-bottom: var(--spacing-sm);
}

.audience-card p {
  color: var(--color-text);
}

/* Social Proof Section */
.social-proof {
  background: var(--color-purple);
  padding: var(--spacing-3xl) 0;
  text-align: center;
  color: var(--color-white);
}

.social-proof h2 {
  color: var(--color-white);
  margin-bottom: var(--spacing-xl);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  max-width: 1000px;
  margin: 0 auto;
}

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

.stat-large {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: 64px;
  color: var(--color-white);
  line-height: 1;
  margin-bottom: var(--spacing-sm);
}

.stat-card p {
  color: var(--color-white);
  font-size: var(--text-body-lg);
  line-height: var(--leading-relaxed);
}

/* Waitlist Section */
.waitlist {
  background: var(--color-white);
  padding: var(--spacing-3xl) 0;
}

.waitlist-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-2xl);
  align-items: start;
}

.waitlist-text h2 {
  margin-bottom: var(--spacing-sm);
}

.waitlist-text p {
  font-size: var(--text-body-lg);
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

.waitlist-benefits {
  list-style: none;
  margin-top: var(--spacing-md);
}

.waitlist-benefits li {
  font-size: var(--text-body);
  color: var(--color-text);
  padding-left: 32px;
  position: relative;
  margin-bottom: var(--spacing-xs);
  line-height: var(--leading-relaxed);
}

.waitlist-benefits li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-purple);
  font-weight: var(--weight-bold);
  font-size: 20px;
}

/* Form Styles - From Brand Guide Example 4 */
.waitlist-form-container {
  background: var(--color-light-bg);
  padding: var(--spacing-lg);
  border-radius: 12px;
}

.waitlist-form {
  max-width: 500px;
}

.form-group {
  margin-bottom: var(--spacing-md);
  text-align: left;
}

.form-group label {
  display: block;
  font-family: var(--font-body);
  font-weight: var(--weight-medium);
  font-size: var(--text-body-sm);
  color: var(--color-navy);
  margin-bottom: var(--spacing-xs);
  letter-spacing: 0.01em;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 12px 16px;
  font-family: var(--font-body);
  font-weight: var(--weight-regular);
  font-size: var(--text-body);
  color: var(--color-black);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border: 2px solid var(--color-purple);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
  padding: 11px 15px; /* Adjust for border increase */
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-gray);
}

.form-group textarea {
  resize: vertical;
  min-height: 80px;
}

.form-footer {
  font-size: var(--text-caption);
  color: var(--color-gray);
  text-align: center;
  margin-top: var(--spacing-sm);
}

/* Footer */
.footer {
  background: var(--color-navy);
  padding: var(--spacing-2xl) 0 var(--spacing-md) 0;
  color: var(--color-white);
}

.footer-content {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-lg);
}

.footer-brand .logo {
  color: var(--color-white);
  margin-bottom: var(--spacing-xs);
}

.footer-brand .logo:hover {
  color: var(--color-purple);
}

.footer-brand p {
  color: var(--color-gray);
  font-size: var(--text-body-sm);
}

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

.footer-column h5 {
  color: var(--color-white);
  margin-bottom: var(--spacing-sm);
  font-size: var(--text-body);
}

.footer-column a {
  display: block;
  color: var(--color-gray);
  text-decoration: none;
  font-size: var(--text-body-sm);
  margin-bottom: 8px;
  transition: color 0.2s ease;
}

.footer-column a:hover {
  color: var(--color-purple);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-md);
  text-align: center;
}

.footer-bottom p {
  color: var(--color-gray);
  font-size: var(--text-body-sm);
}

.footer-credit {
  margin-top: var(--spacing-xs);
}

.footer-credit a {
  color: var(--color-purple);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-credit a:hover {
  color: var(--color-white);
  text-decoration: underline;
}

/* Responsive Design - From Brand Guide Section 3 */
@media (max-width: 768px) {
  :root {
    --text-h1: 40px;
    --text-h2: 32px;
    --text-h3: 24px;
  }

  .nav-links {
    gap: var(--spacing-sm);
  }

  .nav-links a {
    font-size: var(--text-body-sm);
  }

  .hero {
    padding: var(--spacing-2xl) 0;
  }

  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-stats {
    gap: var(--spacing-md);
  }

  .features-grid,
  .audience-grid {
    grid-template-columns: 1fr;
  }

  .waitlist-content {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }

  .footer-links {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  :root {
    --text-h1: 32px;
    --text-h2: 28px;
    --text-h3: 22px;
  }

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

  .btn-primary,
  .btn-secondary {
    padding: 14px 24px;
  }

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

  .problem-grid {
    grid-template-columns: 1fr;
  }

  .step {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .step-number {
    font-size: 48px;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}

/* Focus visible for keyboard navigation */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-purple);
  outline-offset: 2px;
}