/* =====================================================
   Email Auth Compliance Site — Main Stylesheet
   Clean, modern, high-trust, mobile-first design
   ===================================================== */

/* CSS Variables */
:root {
  --color-primary: #1a56db;
  --color-primary-dark: #1648b8;
  --color-primary-light: #e8effc;
  --color-success: #059669;
  --color-warning: #d97706;
  --color-danger: #dc2626;
  --color-text: #1f2937;
  --color-text-muted: #6b7280;
  --color-bg: #ffffff;
  --color-bg-alt: #f9fafb;
  --color-border: #e5e7eb;
  --color-border-dark: #d1d5db;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --max-width: 1140px;
  --radius: 8px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  --transition: 150ms ease;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.75em;
  line-height: 1.25;
  font-weight: 700;
}

h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }

p {
  margin: 0 0 1em;
}

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

a:hover, a:focus {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

ul, ol {
  margin: 0 0 1em;
  padding-left: 1.5em;
}

li {
  margin-bottom: 0.5em;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

@media (min-width: 640px) {
  .container {
    padding: 0 1.5rem;
  }
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  padding: 0.5rem 1rem;
  background: var(--color-primary);
  color: #fff;
  z-index: 1000;
}

.skip-link:focus {
  top: 0;
}

/* Header */
.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  gap: 1rem;
}

.brand {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
}

.brand:hover {
  color: var(--color-primary);
  text-decoration: none;
}

/* Navigation */
.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.main-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow);
}

.main-nav.is-open {
  display: block;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list li {
  margin: 0;
}

.nav-list a {
  display: block;
  padding: 0.875rem 1rem;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition);
}

.nav-list a:hover,
.nav-list a[aria-current="page"] {
  background: var(--color-bg-alt);
  color: var(--color-primary);
  text-decoration: none;
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .main-nav {
    display: block;
    position: static;
    background: none;
    border: none;
    box-shadow: none;
  }

  .nav-list {
    display: flex;
    gap: 0.25rem;
  }

  .nav-list a {
    padding: 0.5rem 0.875rem;
    border: none;
    border-radius: var(--radius);
  }
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-bg) 100%);
  padding: 3rem 0 4rem;
  text-align: center;
}

.hero h1 {
  color: var(--color-text);
  margin-bottom: 0.5em;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 700px;
  margin: 0 auto 2rem;
}

.cta-group {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}

@media (min-width: 480px) {
  .cta-group {
    flex-direction: row;
    justify-content: center;
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.btn-primary:hover,
.btn-primary:focus {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #fff;
}

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-secondary:hover,
.btn-secondary:focus {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

/* Sections */
.section {
  padding: 3rem 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-header {
  text-align: center;
  margin-bottom: 2rem;
}

.section-header p {
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* Content Sections */
.content-section {
  margin-bottom: 2.5rem;
}

.content-section:last-child {
  margin-bottom: 0;
}

.content-section h2,
.content-section h3 {
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-primary-light);
  margin-bottom: 1rem;
}

/* Grid */
.grid {
  display: grid;
  gap: 2rem;
}

.grid-2 {
  grid-template-columns: 1fr;
}

.grid-3 {
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Cards */
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}

.card:hover {
  box-shadow: var(--shadow);
}

.card h3 {
  margin-bottom: 0.75rem;
}

/* Pricing Card */
.pricing-card {
  background: var(--color-bg);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  max-width: 480px;
  margin: 0 auto;
  box-shadow: var(--shadow-lg);
}

.pricing-card h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.pricing-price {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.pricing-who {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  margin-bottom: 1.5rem;
}

.pricing-features {
  text-align: left;
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
}

.pricing-features li {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: 0.75rem;
}

.pricing-features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: 700;
}

.pricing-cta {
  margin-top: 1.5rem;
}

.stripe-note {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.fine-print {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.fine-print ul {
  margin-bottom: 0;
}

/* FAQ Accordion */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--color-bg);
  border: none;
  font: inherit;
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: background var(--transition);
}

.faq-question:hover {
  background: var(--color-bg-alt);
}

.faq-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--color-primary);
  transition: transform var(--transition);
}

.faq-item[open] .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 1.25rem 1.25rem;
  color: var(--color-text-muted);
}

/* Contact Info */
.contact-info {
  display: grid;
  gap: 1rem;
  max-width: 500px;
}

.contact-block {
  display: flex;
  gap: 0.75rem;
  padding: 1rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
}

.contact-block-label {
  font-weight: 600;
  min-width: 80px;
  color: var(--color-text-muted);
}

.contact-block-value {
  word-break: break-word;
}

/* Legal Pages */
.legal-content {
  max-width: 800px;
  margin: 0 auto;
}

.legal-content section {
  margin-bottom: 2rem;
}

.legal-content h2 {
  font-size: 1.25rem;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

/* Notice Box */
.notice-box {
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  margin: 1.5rem 0;
}

.notice-box-warning {
  background: #fef3c7;
  border-left: 4px solid var(--color-warning);
  color: #92400e;
}

.notice-box-info {
  background: var(--color-primary-light);
  border-left: 4px solid var(--color-primary);
  color: var(--color-primary-dark);
}

/* Footer */
.site-footer {
  background: var(--color-text);
  color: #d1d5db;
  padding: 3rem 0 1.5rem;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  gap: 2rem;
  margin-bottom: 2rem;
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer-brand h3 {
  color: #fff;
  margin-bottom: 0.5rem;
}

.footer-brand p {
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

.footer-links h4 {
  color: #fff;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.footer-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: #d1d5db;
  font-size: 0.875rem;
}

.footer-links a:hover {
  color: #fff;
}

.footer-notice {
  padding: 1rem;
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius);
  font-size: 0.8125rem;
  text-align: center;
  margin-bottom: 1.5rem;
}

.footer-bottom {
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.8125rem;
  text-align: center;
}

/* Accessibility */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Loading State */
.loading {
  opacity: 0.5;
  pointer-events: none;
}

.loading::after {
  content: "Loading...";
  display: block;
  text-align: center;
  padding: 2rem;
  color: var(--color-text-muted);
}

/* Utilities */
.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-muted {
  color: var(--color-text-muted);
}

.mb-0 {
  margin-bottom: 0;
}

.mb-1 {
  margin-bottom: 0.5rem;
}

.mb-2 {
  margin-bottom: 1rem;
}

.mb-3 {
  margin-bottom: 1.5rem;
}

.mt-2 {
  margin-top: 1rem;
}

.mt-3 {
  margin-top: 1.5rem;
}

/* Confirmation Page Styles */
.confirmation-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.confirmation-check {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  background: var(--color-success);
  color: #fff;
  border-radius: 50%;
  font-size: 2rem;
  font-weight: 700;
}

.reference-info {
  background: var(--color-bg);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: 1rem;
}

.confirmation-steps {
  max-width: 700px;
  margin: 0 auto;
}

.confirmation-step {
  display: flex;
  gap: 1.25rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

.confirmation-step:last-child {
  border-bottom: none;
}

.step-number {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  font-size: 1.125rem;
  font-weight: 700;
}

.step-content {
  flex: 1;
}

.step-content h2 {
  margin-bottom: 0.5rem;
  font-size: 1.25rem;
}

.step-content h3 {
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
  font-size: 1rem;
  color: var(--color-text-muted);
}

.step-list {
  margin: 0.75rem 0;
  padding-left: 1.25rem;
}

.step-list li {
  margin-bottom: 0.5rem;
}

.step-list.checklist {
  list-style: none;
  padding-left: 0;
}

.step-list.checklist li {
  position: relative;
  padding-left: 1.75rem;
}

.step-list.checklist li::before {
  content: "☐";
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

.step-list ul {
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
  padding-left: 1.5rem;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}