/* ===== Reset ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ===== Theme Tokens (Style Guide Section 10) ===== */
:root {
  --color-bg: #F3F4F6;
  --color-surface: #FFFFFF;
  --color-input: #F9FAFB;
  --color-text: #111827;
  --color-text-secondary: #6B7280;
  --color-accent: #00BFA5;
  --color-accent-drive: #0099bf;
  --color-platform: #111827;
  --color-platform-text: #FFFFFF;
  --color-error: #D32F2F;
  --color-success: #2ECC71;
  --color-warning: #FF9F0A;
  --color-border: #E5E7EB;
  --color-border-input: #E5E7EB;

  /* Elevation */
  --elevation-1: 0 1px 2px rgba(0,0,0,0.04);
  --elevation-2: 0 1px 3px rgba(0,0,0,0.06);
  --elevation-3: 0 4px 12px rgba(0,0,0,0.1), 0 1px 3px rgba(0,0,0,0.06);

  /* Motion */
  --motion-fast: 150ms;
  --motion-standard: 250ms;
  --motion-slow: 300ms;
  --easing: cubic-bezier(0.4, 0, 0.2, 1);

  /* States */
  --state-hover-opacity: 0.92;
  --state-disabled-opacity: 0.5;
  --state-focus-ring: 0.125rem solid var(--color-accent);
}

[data-theme="dark"] {
  --color-bg: #1A1D23;
  --color-surface: #23272F;
  --color-input: #2A2E38;
  --color-text: #F5F7FA;
  --color-text-secondary: #9AA0A6;
  --color-accent: #00E0B7;
  --color-accent-drive: #00B8E6;
  --color-platform: #F5F7FA;
  --color-platform-text: #1A1D23;
  --color-error: #F03E3E;
  --color-success: #2ECC71;
  --color-warning: #FF9F0A;
  --color-border: #353A45;
  --color-border-input: #3D4350;
}

/* ===== Base ===== */
html {
  scroll-behavior: smooth;
  font-size: 100%;
}

body {
  font-family: "Segoe UI Variable", "Segoe UI", -apple-system, BlinkMacSystemFont, "Inter", "Roboto", "Helvetica Neue", sans-serif;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===== Typography (Style Guide Section 3) ===== */
h1 {
  font-size: 2.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

h2 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

h3 {
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1.4;
}

.text-small {
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--color-text-secondary);
}

/* ===== Screen Reader Only ===== */
.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;
}

/* ===== Skip Link ===== */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 1000;
  padding: 0.75rem 1.25rem;
  background: var(--color-accent);
  color: #0E1116;
  font-weight: 500;
  text-decoration: none;
  border-radius: 0.25rem;
}

.skip-link:focus {
  top: 1rem;
}

/* ===== Layout ===== */
.container {
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 4rem 0;
}

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

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-text);
}

.nav-logo img {
  height: 2rem;
  width: auto;
}

.nav-logo span {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--motion-fast) var(--easing);
}

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

.nav-links a:focus-visible {
  outline: var(--state-focus-ring);
  outline-offset: 0.25rem;
  border-radius: 0.125rem;
}

/* Dark mode toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  border-radius: 0.25rem;
  transition: color var(--motion-fast) var(--easing);
}

.theme-toggle:hover {
  color: var(--color-text);
}

.theme-toggle:focus-visible {
  outline: var(--state-focus-ring);
  outline-offset: 0.125rem;
}

.theme-toggle svg {
  width: 1.25rem;
  height: 1.25rem;
}

/* Hamburger menu */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: none;
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  border-radius: 0.25rem;
}

.nav-toggle:focus-visible {
  outline: var(--state-focus-ring);
  outline-offset: 0.125rem;
}

.nav-toggle svg {
  width: 1.5rem;
  height: 1.5rem;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  overflow: hidden;
  padding: 5rem 0 1.5rem;
  text-align: center;
  background:
    radial-gradient(ellipse 50% 60% at 30% 0%, rgba(0, 191, 165, 0.05) 0%, transparent 60%),
    radial-gradient(ellipse 50% 60% at 70% 0%, rgba(0, 153, 191, 0.05) 0%, transparent 60%),
    var(--color-surface);
}

[data-theme="dark"] .hero {
  background:
    radial-gradient(ellipse 50% 60% at 30% 0%, rgba(0, 224, 183, 0.07) 0%, transparent 60%),
    radial-gradient(ellipse 50% 60% at 70% 0%, rgba(0, 184, 230, 0.07) 0%, transparent 60%),
    var(--color-surface);
}

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

.hero h1 {
  margin-bottom: 1rem;
}

.hero-tagline {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
}

.hero-subtagline {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
}

.hero-product-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 2.5rem;
}

.hero-product-link {
  font-size: 0.875rem;
  text-decoration: underline;
  text-underline-offset: 0.2em;
  transition: color var(--motion-fast) var(--easing);
}

.hero-product-link.link-mail {
  color: var(--color-accent);
}

.hero-product-link.link-drive {
  color: var(--color-accent-drive);
}

.hero-product-link:hover {
  color: var(--color-text);
}

.hero-form {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  max-width: 28rem;
  margin: 0 auto;
}

.hero-form input[type="email"] {
  flex: 1;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  background: var(--color-input);
  color: var(--color-text);
  border: 1px solid var(--color-border-input);
  border-radius: 0.375rem;
  transition: border-color var(--motion-fast) var(--easing);
}

.hero-form input[type="email"]:focus {
  outline: none;
  border-color: var(--color-platform);
  box-shadow: 0 0 0 0.1875rem rgba(17, 24, 39, 0.15);
}

[data-theme="dark"] .hero-form input[type="email"]:focus {
  box-shadow: 0 0 0 0.1875rem rgba(245, 247, 250, 0.15);
}

/* Honeypot */
.hp-field {
  position: absolute;
  left: -9999px;
  opacity: 0;
  height: 0;
  width: 0;
  overflow: hidden;
}

/* ===== Buttons ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #0E1116;
  background: var(--color-accent);
  border: none;
  border-radius: 0.25rem;
  cursor: pointer;
  transition: background var(--motion-fast) var(--easing), opacity var(--motion-fast) var(--easing);
  white-space: nowrap;
}

.btn-primary:hover {
  opacity: var(--state-hover-opacity);
}

.btn-primary:focus-visible {
  outline: var(--state-focus-ring);
  outline-offset: 0.125rem;
}

.btn-primary:disabled {
  opacity: var(--state-disabled-opacity);
  cursor: not-allowed;
}

.btn-platform {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  justify-content: center;
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-platform-text);
  background: var(--color-platform);
  border: none;
  border-radius: 0.25rem;
  cursor: pointer;
  transition: opacity var(--motion-fast) var(--easing);
  white-space: nowrap;
}

.btn-platform:hover {
  opacity: var(--state-hover-opacity);
}

.btn-platform:focus-visible {
  outline: 0.125rem solid var(--color-platform);
  outline-offset: 0.125rem;
}

.btn-platform:disabled {
  opacity: var(--state-disabled-opacity);
  cursor: not-allowed;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  background: transparent;
  border: 0.0625rem solid var(--color-accent);
  border-radius: 0.25rem;
  cursor: pointer;
  text-decoration: none;
  transition: box-shadow var(--motion-fast) var(--easing);
}

.btn-secondary:hover {
  box-shadow: 0 0 0 0.1875rem rgba(0, 224, 183, 0.15);
}

.btn-secondary:focus-visible {
  outline: var(--state-focus-ring);
  outline-offset: 0.125rem;
}

/* ===== Products Section ===== */
.products {
  background: var(--color-bg);
}

.section-heading {
  text-align: center;
  margin-bottom: 3rem;
}

.section-subtitle {
  color: var(--color-text-secondary);
  font-size: 1.125rem;
  margin-top: 0.75rem;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.product-card {
  background: var(--color-surface);
  border-radius: 0.375rem;
  padding: 2rem;
  box-shadow: var(--elevation-1);
  border: 1px solid var(--color-border);
  transition: transform var(--motion-standard) var(--easing), box-shadow var(--motion-standard) var(--easing);
}

.product-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--elevation-3);
}

.product-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.product-card-header img {
  width: 3rem;
  height: 3rem;
}

.product-card h3 {
  margin-bottom: 0.25rem;
}

.product-card .product-tagline {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.product-card p {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.accent-bar-mail {
  border-top: 3px solid #00BFA5;
}

[data-theme="dark"] .accent-bar-mail {
  border-top-color: #00E0B7;
}

.accent-bar-drive {
  border-top: 3px solid #0099bf;
}

[data-theme="dark"] .accent-bar-drive {
  border-top-color: #00B8E6;
}

.product-features {
  list-style: none;
  padding: 0;
}

.product-features li {
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.product-features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85rem;
  width: 0.5rem;
  height: 0.5rem;
  background: var(--color-accent);
  border-radius: 50%;
}

.coming-soon-badge {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  border-radius: 0.25rem;
}

.coming-soon-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

.coming-soon-item {
  background: var(--color-surface);
  border-radius: 0.375rem;
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  text-align: center;
  transition: transform var(--motion-standard) var(--easing), box-shadow var(--motion-standard) var(--easing);
}

.coming-soon-item:hover {
  transform: translateY(-1px);
  box-shadow: var(--elevation-2);
}

.coming-soon-item h3 {
  margin-bottom: 0.5rem;
}

.coming-soon-item p {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.coming-soon-item::after {
  content: "Coming soon";
  display: block;
  margin-top: 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  opacity: 0.6;
}

/* ===== Demo Section ===== */
.demo {
  background: var(--color-surface);
}

.demo-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.demo-item {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.demo-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  border-radius: 0.375rem;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--color-border);
}

.demo-placeholder img {
  width: 3rem;
  height: 3rem;
  opacity: 0.5;
}

.demo-item h3 {
  text-align: center;
}

.demo-caption {
  text-align: center;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ===== Features Section ===== */
.features {
  background: var(--color-bg);
}

.features-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
}

.features-grid > .feature-card {
  flex: 0 1 calc((100% - 4rem) / 3);
  min-width: 16rem;
}

.feature-card {
  background: var(--color-surface);
  border-radius: 0.375rem;
  padding: 2rem;
  box-shadow: var(--elevation-1);
  border: 1px solid var(--color-border);
  text-align: center;
  transition: transform var(--motion-standard) var(--easing), box-shadow var(--motion-standard) var(--easing);
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--elevation-3);
}

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  margin: 0 auto 1rem;
  color: var(--color-platform);
}

.feature-icon svg {
  width: 2rem;
  height: 2rem;
}

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

.feature-card p {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ===== IronMail Spotlight ===== */
.ironmail-spotlight,
.irondrive-spotlight {
  background: var(--color-bg);
  padding: 4rem 0;
}

.spotlight-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.spotlight-header img {
  width: 2.5rem;
  height: 2.5rem;
}

.personas-heading {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* ===== Personas Section ===== */
.personas {
  background: var(--color-surface);
}

.personas-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.persona-card {
  background: var(--color-bg);
  border-radius: 0.375rem;
  padding: 2rem;
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-text-secondary);
  margin: 0;
  transition: transform var(--motion-standard) var(--easing), box-shadow var(--motion-standard) var(--easing);
}

.persona-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--elevation-3);
}

.persona-card p {
  color: var(--color-text-secondary);
  line-height: 1.7;
  font-style: italic;
}

/* ===== Signup Section ===== */
.signup {
  background: var(--color-surface);
  text-align: center;
}

.signup h2 {
  margin-bottom: 0.75rem;
}

.signup-description {
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
  max-width: 32rem;
  margin-left: auto;
  margin-right: auto;
}

.signup-form {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  max-width: 28rem;
  margin: 0 auto 1rem;
}

.signup-form input[type="email"] {
  flex: 1;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  background: var(--color-input);
  color: var(--color-text);
  border: 1px solid var(--color-border-input);
  border-radius: 0.375rem;
  transition: border-color var(--motion-fast) var(--easing);
}

.signup-form input[type="email"]:focus {
  outline: none;
  border-color: var(--color-platform);
  box-shadow: 0 0 0 0.1875rem rgba(17, 24, 39, 0.15);
}

[data-theme="dark"] .signup-form input[type="email"]:focus {
  box-shadow: 0 0 0 0.1875rem rgba(245, 247, 250, 0.15);
}

.signup-help {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.form-status {
  margin-top: 1rem;
  font-size: 0.875rem;
  min-height: 1.5rem;
}

.form-status.success {
  color: var(--color-success);
}

.form-status.error {
  color: var(--color-error);
}

/* ===== About Section ===== */
.about {
  background: var(--color-bg);
}

.about-content {
  max-width: 48rem;
  margin: 0 auto;
}

.about-content h2 {
  margin-bottom: 1.5rem;
}

.about-content p {
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.compare-links {
  list-style: none;
  padding: 0;
  margin-bottom: 2rem;
}

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

.compare-links a {
  color: var(--color-platform);
  text-decoration: underline;
  text-underline-offset: 0.2em;
  font-size: 1rem;
}

.compare-links a:hover {
  color: var(--color-text);
}

/* ===== Comparison Cards ===== */
.compare-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.compare-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
  text-decoration: none;
  color: var(--color-text);
  transition: transform var(--motion-standard) var(--easing), box-shadow var(--motion-standard) var(--easing), border-color var(--motion-standard) var(--easing);
}

.compare-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--elevation-3);
  border-color: var(--color-text-secondary);
}

.compare-card:focus-visible {
  outline: var(--state-focus-ring);
  outline-offset: 0.125rem;
}

.compare-card-title {
  font-size: 1rem;
  font-weight: 600;
}

.compare-card-desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  flex: 1;
}

.compare-card-arrow {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  align-self: flex-end;
  transition: transform var(--motion-fast) var(--easing), color var(--motion-fast) var(--easing);
}

.compare-card:hover .compare-card-arrow {
  color: var(--color-text);
  transform: translateX(4px);
}

.about-status {
  display: inline-block;
  margin-top: 2rem;
  padding: 0.75rem 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.about-status a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.about-status a:hover {
  color: var(--color-text);
}

/* ===== Compliance Row ===== */
.compliance {
  background: var(--color-surface);
  padding: 3rem 0;
}

.compliance h2 {
  text-align: center;
  margin-bottom: 2rem;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  font-weight: 400;
}

.compliance-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3rem;
  flex-wrap: wrap;
}

.compliance-logos span {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.5rem 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: 0.25rem;
  background: var(--color-bg);
}

/* ===== Footer ===== */
.site-footer {
  --footer-bg: #1A1D23;
  --footer-text: #9AA0A6;
  --footer-text-bright: #F5F7FA;
  --footer-border: #353A45;
  --footer-muted: #6B7280;
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 3rem 0;
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-brand img {
  height: 1.5rem;
  width: auto;
}

.footer-brand span {
  font-size: 1rem;
  font-weight: 600;
  color: var(--footer-text-bright);
}

.footer-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.footer-links a {
  color: var(--footer-text);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--motion-fast) var(--easing);
}

.footer-links a:hover {
  color: var(--footer-text-bright);
}

.footer-links a:focus-visible {
  outline: 0.125rem solid var(--color-accent);
  outline-offset: 0.25rem;
  border-radius: 0.125rem;
}

.footer-disclaimer {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--footer-muted);
  border-top: 1px solid var(--footer-border);
  padding-top: 1.5rem;
}

.footer-copyright {
  font-size: 0.8125rem;
  color: var(--footer-muted);
}

/* ===== Particle Background ===== */
.hero-particles {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.particle {
  position: absolute;
  border-radius: 50%;
  background: var(--color-platform);
  opacity: 0.18;
  animation: float linear infinite;
}

.particle:nth-child(1)  { width: 6px; height: 6px; top: 15%; left: 10%; animation-duration: 18s; animation-delay: 0s; }
.particle:nth-child(2)  { width: 4px; height: 4px; top: 25%; left: 85%; animation-duration: 22s; animation-delay: -3s; }
.particle:nth-child(3)  { width: 8px; height: 8px; top: 60%; left: 20%; animation-duration: 20s; animation-delay: -5s; }
.particle:nth-child(4)  { width: 5px; height: 5px; top: 70%; left: 75%; animation-duration: 25s; animation-delay: -8s; }
.particle:nth-child(5)  { width: 7px; height: 7px; top: 40%; left: 50%; animation-duration: 19s; animation-delay: -2s; }
.particle:nth-child(6)  { width: 4px; height: 4px; top: 80%; left: 40%; animation-duration: 23s; animation-delay: -11s; }
.particle:nth-child(7)  { width: 6px; height: 6px; top: 10%; left: 65%; animation-duration: 17s; animation-delay: -7s; }
.particle:nth-child(8)  { width: 5px; height: 5px; top: 50%; left: 30%; animation-duration: 21s; animation-delay: -4s; }
.particle:nth-child(9)  { width: 7px; height: 7px; top: 35%; left: 90%; animation-duration: 24s; animation-delay: -9s; }
.particle:nth-child(10) { width: 4px; height: 4px; top: 85%; left: 55%; animation-duration: 16s; animation-delay: -6s; }

@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  25% { transform: translate(10px, -20px); }
  50% { transform: translate(-5px, 15px); }
  75% { transform: translate(12px, -10px); }
}

/* ===== Mobile Navigation Overlay ===== */
.nav-overlay {
  display: none;
  position: fixed;
  top: 4rem;
  left: 0;
  right: 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 1.5rem;
  z-index: 99;
  box-shadow: var(--elevation-3);
}

.nav-overlay.active {
  display: block;
}

.nav-overlay ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.nav-overlay a {
  display: block;
  padding: 0.75rem 0;
  color: var(--color-text);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  border-bottom: 1px solid var(--color-border);
}

.nav-overlay a:focus-visible {
  outline: var(--state-focus-ring);
  outline-offset: 0.125rem;
}

/* ===== Security Page ===== */
.security-content {
  max-width: 48rem;
  margin: 0 auto;
}

.security-content > p {
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 2rem;
  font-size: 1.125rem;
}

.principle {
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--color-surface);
  border-radius: 0.375rem;
  border: 1px solid var(--color-border);
  transition: transform var(--motion-standard) var(--easing), box-shadow var(--motion-standard) var(--easing);
}

.principle:hover {
  transform: translateY(-1px);
  box-shadow: var(--elevation-2);
}

.principle h2 {
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.principle p {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.security-closing {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  font-style: italic;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.security-closing a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.security-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 2rem;
  border-bottom: 2px solid var(--color-border);
}

.security-tab {
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color 0.2s, border-color 0.2s;
}

.security-tab:hover {
  color: var(--color-text);
}

.security-tab.active {
  color: var(--color-platform);
  border-bottom-color: var(--color-platform);
}

.security-lede {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 2rem;
}

.overview-toc {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
  padding: 1.5rem 2rem;
  margin-bottom: 3rem;
}

.overview-toc ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
}

.overview-toc a {
  color: var(--color-platform);
  text-decoration: underline;
  text-underline-offset: 0.2em;
  font-size: 0.875rem;
}

.overview-toc a:hover {
  color: var(--color-text);
}

.overview-details {
  margin: 1.5rem 0;
}

.overview-details dt {
  font-weight: 600;
  margin-top: 1.25rem;
  margin-bottom: 0.25rem;
}

.overview-details dd {
  margin-left: 0;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.overview-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0;
}

.overview-list li {
  padding: 0.4rem 0 0.4rem 1.5rem;
  position: relative;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.overview-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85rem;
  width: 0.5rem;
  height: 0.5rem;
  background: var(--color-platform);
  border-radius: 50%;
}

.security-content h2 {
  margin-top: 2rem;
  padding-top: 1rem;
}

.security-content h3 {
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

/* ===== Spotlight Feature Grid ===== */
.spotlight-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  max-width: 48rem;
  margin: 0 auto;
}

.spotlight-feature {
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
  transition: transform var(--motion-standard) var(--easing), box-shadow var(--motion-standard) var(--easing);
}

.spotlight-feature:hover {
  transform: translateY(-2px);
  box-shadow: var(--elevation-3);
}

.ironmail-spotlight .spotlight-feature {
  border-top: 2px solid var(--color-accent);
}

.irondrive-spotlight .spotlight-feature {
  border-top: 2px solid var(--color-accent-drive);
}

.spotlight-feature h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.spotlight-feature p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ===== Section Divider ===== */
.section-divider {
  width: 3rem;
  height: 2px;
  background: var(--color-accent);
  margin: 0 auto 2rem;
  border: none;
}

/* ===== Scroll Reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(1.25rem);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-stagger > .reveal:nth-child(2) { transition-delay: 0.08s; }
.reveal-stagger > .reveal:nth-child(3) { transition-delay: 0.16s; }
.reveal-stagger > .reveal:nth-child(4) { transition-delay: 0.24s; }

/* ===== Responsive: Tablet (40em - 64em) ===== */
@media (max-width: 64em) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .personas-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  h1 {
    font-size: 2rem;
  }
}

/* ===== Responsive: Mobile (<40em) ===== */
@media (max-width: 40em) {
  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: 4rem 0;
  }

  h1 {
    font-size: 1.75rem;
  }

  .hero-form,
  .signup-form {
    flex-direction: column;
  }

  .product-grid,
  .demo-grid {
    grid-template-columns: 1fr;
  }

  .features-grid > .feature-card {
    flex: 1 1 100%;
  }

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

  .coming-soon-row {
    grid-template-columns: 1fr;
  }

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

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

  .footer-top {
    flex-direction: column;
    gap: 1.5rem;
  }

  .footer-links {
    flex-direction: column;
    gap: 0.75rem;
  }

  section {
    padding: 3rem 0;
  }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ===== Buttondown Verification Modal ===== */
.bd-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.bd-modal {
  position: relative;
  background: #fff;
  border-radius: 12px;
  width: 90%;
  max-width: 480px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.bd-modal-close {
  position: absolute;
  top: 8px;
  right: 12px;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: #666;
  z-index: 1;
  line-height: 1;
  padding: 4px 8px;
}

.bd-modal-close:hover {
  color: #000;
}

.bd-modal-iframe {
  width: 100%;
  height: 400px;
  border: none;
}