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

/* === Theme Variables === */
:root,
[data-theme="light"] {
  --color-bg: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-bg-tertiary: #f3f4f6;
  --color-text: #111827;
  --color-text-secondary: #6b7280;
  --color-text-muted: #9ca3af;
  --color-border: #e5e7eb;
  --color-border-light: #f3f4f6;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-success: #166534;
  --color-success-bg: #dcfce7;
  --color-error: #991b1b;
  --color-error-bg: #fee2e2;
  --color-warning-bg: #fef9c3;
  --color-card-bg: #ffffff;
  --color-header-bg: rgba(255, 255, 255, 0.95);
  --color-topnav-bg: #0f172a;
  --color-topnav-border: #1e293b;
  --color-nav-text: #94a3b8;
  --color-nav-text-hover: #e2e8f0;
  --color-nav-hover-bg: #1e293b;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
}

[data-theme="dark"] {
  --color-bg: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-bg-tertiary: #334155;
  --color-text: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-border: #334155;
  --color-border-light: #1e293b;
  --color-primary: #3b82f6;
  --color-primary-hover: #60a5fa;
  --color-primary-light: #1e3a5f;
  --color-success: #4ade80;
  --color-success-bg: #14532d;
  --color-error: #f87171;
  --color-error-bg: #7f1d1d;
  --color-warning-bg: #713f12;
  --color-card-bg: #1e293b;
  --color-header-bg: rgba(15, 23, 42, 0.95);
  --color-topnav-bg: #0f172a;
  --color-topnav-border: #1e293b;
  --color-nav-text: #94a3b8;
  --color-nav-text-hover: #e2e8f0;
  --color-nav-hover-bg: #1e293b;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.4);
}

/* === Base === */
html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  padding-top: 64px;
}

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

a:hover {
  color: var(--color-primary-hover);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* === Typography === */
h1, h2, h3 {
  line-height: 1.2;
  font-weight: 700;
}

.section-title {
  font-size: 2rem;
  text-align: center;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--color-text-secondary);
  text-align: center;
  margin-bottom: 2.5rem;
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  border-radius: 0.375rem;
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: inherit;
  border: 1px solid transparent;
}

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

.btn-primary:hover {
  background: var(--color-primary-hover);
  color: #ffffff;
}

.btn-outline {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}

.btn-outline:hover {
  border-color: var(--color-text-secondary);
}

.btn-sm {
  padding: 0.4rem 0.9rem;
  font-size: 0.8rem;
}

.btn-md {
  padding: 0.6rem 1.5rem;
  font-size: 0.9rem;
}

/* === Header === */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: var(--color-header-bg);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 1rem;
}

.logo {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  text-decoration: none;
}

.logo-main {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-primary);
}

.logo:hover .logo-main {
  color: var(--color-primary-hover);
}

.logo-sub {
  font-size: 0.65rem;
  color: var(--color-text-muted);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.main-nav {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color 0.15s;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.lang-selector {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 0.25rem;
}

.lang-selector .lang-code {
  font-weight: 500;
}

/* Theme toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  cursor: pointer;
  user-select: none;
}

.theme-toggle span {
  font-size: 0.6rem;
  line-height: 1;
}

.theme-switch {
  width: 1.5rem;
  height: 0.85rem;
  background: var(--color-primary);
  border-radius: 9999px;
  position: relative;
  transition: background 0.2s;
}

.theme-knob {
  width: 0.6rem;
  height: 0.6rem;
  background: #ffffff;
  border-radius: 50%;
  position: absolute;
  top: 0.125rem;
  right: 0.15rem;
  transition: transform 0.2s;
}

[data-theme="dark"] .theme-knob {
  transform: translateX(-0.6rem);
}

.hamburger {
  display: none;
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--color-text);
}

/* === Hero === */
.hero {
  padding: 4rem 0 3rem;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  padding: 0.3rem 1rem;
  border: 1px solid var(--color-primary);
  border-radius: 9999px;
  font-size: 0.7rem;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
  text-transform: uppercase;
}

.hero-title {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  max-width: 650px;
  margin-left: auto;
  margin-right: auto;
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 3rem;
}

/* === Pillars grid === */
.pillars {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  max-width: 700px;
  margin: 0 auto 3rem;
}

.pillar {
  padding: 0.7rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 0.4rem;
  text-align: left;
}

.pillar-icon {
  font-size: 1rem;
  margin-bottom: 0.15rem;
}

.pillar-title {
  font-weight: 600;
  font-size: 0.75rem;
  margin-bottom: 0.1rem;
}

.pillar-desc {
  font-size: 0.68rem;
  color: var(--color-text-secondary);
  line-height: 1.35;
}

/* === Live-Shield === */
.live-shield {
  margin-top: 1rem;
}

.live-shield-title {
  font-size: 0.8rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 0.75rem;
}

.live-shield-grid {
  display: flex;
  gap: 0.75rem;
  max-width: 750px;
  margin: 0 auto;
}

.shield-col {
  flex: 1;
  border: 1px solid var(--color-border);
  border-radius: 0.3rem;
  overflow: hidden;
}

.shield-col.danger {
  flex: 1.4;
}

.shield-col.success {
  flex: 1;
}

.shield-col-header {
  padding: 0.35rem 0.5rem;
  font-size: 0.65rem;
  font-weight: 600;
  text-align: center;
}

.shield-col.danger .shield-col-header {
  background: var(--color-error-bg);
  color: var(--color-error);
}

.shield-col.success .shield-col-header {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.shield-col-body {
  padding: 0.3rem 0.4rem;
  font-size: 0.6rem;
}

.shield-item {
  padding: 0.25rem 0.35rem;
  border-radius: 0.2rem;
  margin-bottom: 0.2rem;
  line-height: 1.25;
}

.shield-item.danger {
  background: var(--color-error-bg);
}

.shield-item.success {
  background: var(--color-success-bg);
}

.shield-item.warning {
  background: var(--color-warning-bg);
}

.shield-item-meta {
  color: var(--color-text-muted);
  font-size: 0.55rem;
}

/* === How it works === */
.how-it-works {
  padding: 4rem 0;
}

.steps {
  display: flex;
  gap: 1rem;
}

.step {
  flex: 1;
  text-align: center;
  padding: 1.5rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
}

.step.invisible {
  background: var(--color-bg-secondary);
}

.step-icon {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.step-label {
  display: inline-block;
  padding: 0.1rem 0.4rem;
  border-radius: 9999px;
  font-size: 0.55rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.step-label.you {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.step-label.inv {
  background: #f3e8ff;
  color: #6b21a8;
}

.step-title {
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
}

.step-desc {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.step-accents {
  text-align: center;
  margin-top: 1rem;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.step-accent-main {
  font-style: italic;
  margin-bottom: 0.2rem;
}

/* === Pricing === */
.pricing {
  padding: 4rem 0;
}

.pricing-grid {
  display: flex;
  gap: 0.75rem;
  align-items: stretch;
}

.plan-card {
  flex: 1;
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  display: flex;
  flex-direction: column;
}

.plan-card.featured {
  border: 2px solid var(--color-primary);
  position: relative;
}

.plan-badge {
  position: absolute;
  top: -0.65rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: #ffffff;
  padding: 0.2rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.6rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.plan-name {
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.plan-desc {
  font-size: 0.7rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
}

.plan-price {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.plan-price-unit {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--color-text-secondary);
}

.plan-features {
  list-style: none;
  border-top: 1px solid var(--color-border);
  margin-bottom: 1rem;
  padding-top: 0.75rem;
  flex: 1;
}

.plan-features li {
  font-size: 0.75rem;
  padding: 0.25rem 0;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.plan-features .check {
  color: var(--color-success);
}

.plan-features .cross {
  color: var(--color-error);
}

.plan-cta {
  display: block;
  text-align: center;
  padding: 0.5rem;
  border-radius: 0.375rem;
  font-size: 0.8rem;
  font-weight: 500;
}

.plan-card.featured .plan-cta {
  background: var(--color-primary);
  color: #ffffff;
}

.plan-card:not(.featured) .plan-cta {
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.plan-card:not(.featured) .plan-cta:hover {
  border-color: var(--color-text-secondary);
}

.plan-card.enterprise .plan-cta {
  color: var(--color-text-muted);
}

.pricing-guarantee {
  margin-top: 1.25rem;
  padding: 0.75rem;
  background: var(--color-bg-secondary);
  border-radius: 0.4rem;
  text-align: center;
  font-size: 0.8rem;
}

.pricing-guarantee strong {
  color: var(--color-text);
}

/* === Trust === */
.trust {
  padding: 4rem 0;
}

.trust-grid {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 2rem;
}

.trust-card {
  flex: 1;
  text-align: center;
  padding: 1.25rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
}

.trust-icon {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.trust-title {
  font-weight: 600;
  font-size: 0.8rem;
  margin-bottom: 0.15rem;
}

.trust-desc {
  font-size: 0.7rem;
  color: var(--color-text-secondary);
}

.roi-teaser {
  padding: 1.25rem;
  background: var(--color-bg-secondary);
  border-radius: 0.5rem;
  text-align: center;
}

.roi-teaser-title {
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 0.4rem;
}

.roi-teaser-desc {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
}

.roi-inputs {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  align-items: flex-end;
  font-size: 0.7rem;
}

.roi-label {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  text-align: left;
}

.roi-label span {
  font-size: 0.65rem;
  color: var(--color-text-secondary);
}

.roi-input {
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 0.25rem;
  background: var(--color-card-bg);
  color: var(--color-text);
  font-family: inherit;
  font-size: 0.9rem;
  width: 80px;
  text-align: center;
}

.roi-btn {
  padding: 0.4rem 0.9rem;
  background: var(--color-primary);
  color: #ffffff;
  border: none;
  border-radius: 0.25rem;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.7rem;
  font-weight: 500;
  height: 34px;
}

.roi-result {
  margin-top: 0.75rem;
  padding: 0.6rem 1rem;
  background: var(--color-primary-light);
  border-radius: 0.35rem;
  max-width: 320px;
  margin-left: auto;
  margin-right: auto;
}

.roi-result-value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-primary);
}

.roi-result-unit {
  font-size: 0.65rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  margin-left: 0.2rem;
}

.roi-result-detail {
  font-size: 0.65rem;
  color: var(--color-text-secondary);
  margin-top: 0.15rem;
}

/* === Section spacing === */
.section {
  padding: 4rem 0;
}

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

/* === Footer === */
.site-footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 0 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.footer-col {
  flex: 1;
}

.footer-brand {
  flex: 1.5;
}

.footer-logo {
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.footer-tagline {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.footer-heading {
  font-weight: 600;
  font-size: 0.75rem;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.4rem;
}

.footer-links a {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

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

.footer-bottom {
  padding: 1rem 0;
}

.footer-bottom-inner {
  display: flex;
  justify-content: space-between;
  font-size: 0.65rem;
  color: var(--color-text-muted);
}

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

/* === Page placeholder === */
.page-placeholder {
  padding: 4rem 0;
  text-align: center;
}

.page-placeholder h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.page-placeholder p {
  color: var(--color-text-secondary);
}

/* === Responsive === */
@media (max-width: 768px) {
  .main-nav {
    display: none;
  }

  .header-tools .btn {
    display: none;
  }

  .hamburger {
    display: block;
  }

  .hero-title {
    font-size: 1.75rem;
  }

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

  .live-shield-grid {
    flex-direction: column;
  }

  .steps {
    flex-direction: column;
  }

  .pricing-grid {
    flex-direction: column;
  }

  .trust-grid {
    flex-direction: column;
  }

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