/* ── Custom Properties ── */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-dark: #0f172a;
  --color-text: #334155;
  --color-text-light: #64748b;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-border: #e2e8f0;
  --color-success: #10b981;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --font: 'Inter', system-ui, -apple-system, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body.nav-open {
  overflow: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

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

/* ── Container ── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Section Defaults ── */
.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-dark);
  text-align: center;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-light);
  text-align: center;
  max-width: 600px;
  margin: 0 auto 48px;
}

/* ── Header ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.site-header.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 32px;
}

/* ── Logo ── */
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.logo-text {
  color: var(--color-dark);
}

.logo-badge {
  background: var(--color-primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0.02em;
}

/* ── Navigation ── */
.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  transition: color 0.2s;
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.2s;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font);
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

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

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

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

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

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: transparent;
}

.btn-ghost:hover {
  background: var(--color-primary-light);
}

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

.btn-white:hover {
  background: #f1f5f9;
  border-color: #f1f5f9;
}

.btn-outline-white {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline-white:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: #fff;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1rem;
}

.btn-full {
  width: 100%;
}

/* ── Hamburger ── */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-dark);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Mobile Nav ── */
.mobile-nav {
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: var(--color-bg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  transform: translateY(-120%);
  transition: transform 0.3s ease;
  z-index: 99;
}

.mobile-nav.open {
  transform: translateY(0);
}

.mobile-nav-link {
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--color-text);
  padding: 8px 0;
}

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

.mobile-nav-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 8px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

/* ── Hero ── */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #f0f5ff 0%, #e8f0ff 50%, #f8fafc 100%);
  padding: 80px 0;
  overflow: hidden;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-eyebrow {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.hero-title {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--color-dark);
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ── Hero Trust ── */
.hero-trust {
  display: flex;
  gap: 20px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.hero-trust-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-light);
}

.hero-trust-item svg {
  color: var(--color-success);
  flex-shrink: 0;
}

/* ── Hero Visual / Flow ── */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-illustration {
  width: 100%;
}

.hero-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  box-shadow: var(--shadow-lg);
  flex-wrap: wrap;
}

.hero-flow-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
}

.hero-flow-icon {
  width: 44px;
  height: 44px;
  background: var(--color-primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.hero-flow-step span {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-dark);
}

.hero-flow-arrow {
  color: var(--color-text-light);
  font-size: 1.25rem;
  margin: 0 4px;
}

/* ── Pain Section ── */
.pain-section {
  padding: 64px 0;
  background: #fef2f2;
}

.pain-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-top: 40px;
}

.pain-card {
  background: #fff;
  border: 1px solid #fecaca;
  border-radius: var(--radius-md);
  padding: 24px 16px;
  text-align: center;
  opacity: 0;
  transform: translateY(15px);
  transition: opacity 0.4s, transform 0.4s;
}

.pain-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.pain-icon {
  color: #dc2626;
  margin-bottom: 12px;
  display: flex;
  justify-content: center;
}

.pain-card p {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-dark);
  line-height: 1.4;
}

/* ── Solution Section ── */
.solution-section {
  padding: 80px 0;
}

.solution-flow {
  max-width: 700px;
  margin: 0 auto;
}

.solution-step {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  opacity: 0;
  transform: translateY(15px);
  transition: opacity 0.4s, transform 0.4s;
}

.solution-step.visible {
  opacity: 1;
  transform: translateY(0);
}

.solution-step-number {
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  flex-shrink: 0;
}

.solution-step-content h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 6px;
}

.solution-step-content p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

.solution-connector {
  width: 2px;
  height: 32px;
  background: var(--color-border);
  margin-left: 23px;
}

/* ── ROI Section ── */
.roi-section {
  padding: 80px 0;
  background: var(--color-bg-alt);
}

.roi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.roi-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  text-align: center;
  opacity: 0;
  transform: translateY(15px);
  transition: opacity 0.4s, transform 0.4s;
}

.roi-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.roi-metric {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.roi-label {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.roi-desc {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* ── Module Advantages ── */
.modules-section {
  padding: 80px 0;
  background: var(--color-bg-alt);
}

.modules-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.module-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
  opacity: 0;
  transform: translateY(20px);
}

.module-card.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s, transform 0.5s;
}

.module-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.module-icon {
  width: 44px;
  height: 44px;
  background: var(--color-primary-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.module-card-title {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 6px;
}

.module-card-desc {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.module-benefits {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.module-benefits li {
  font-size: 0.875rem;
  color: var(--color-text);
  padding-left: 20px;
  position: relative;
}

.module-benefits li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-success);
  opacity: 0.2;
}

.module-benefits li::after {
  content: '';
  position: absolute;
  left: 3px;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-success);
}

/* ── Use Cases ── */
.use-cases-section {
  padding: 80px 0;
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.use-case-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  position: relative;
  overflow: hidden;
  opacity: 0;
  transform: translateY(20px);
}

.use-case-card.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s, transform 0.5s;
}

.use-case-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-primary);
  opacity: 0.1;
  line-height: 1;
  margin-bottom: 8px;
}

.use-case-title {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.use-case-desc {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.5;
  margin-bottom: 12px;
}

.use-case-audience {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 4px 10px;
  border-radius: 20px;
}

/* ── OneHR Integration Cases ── */
.onehr-cases-section {
  padding: 80px 0;
  background: var(--color-bg-alt);
}

.onehr-cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.onehr-case-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: border-color 0.2s, box-shadow 0.2s, opacity 0.5s, transform 0.5s;
  opacity: 0;
  transform: translateY(20px);
}

.onehr-case-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.onehr-case-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.onehr-case-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.onehr-case-icon {
  width: 40px;
  height: 40px;
  background: var(--color-primary-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.onehr-case-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-dark);
}

.onehr-case-desc {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.5;
  margin-bottom: 16px;
}

.onehr-case-flow {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.flow-step {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 4px 10px;
  border-radius: 20px;
  white-space: nowrap;
}

.flow-arrow {
  color: var(--color-text-light);
  font-size: 0.875rem;
}

/* ── FAQ ── */
.faq-section {
  padding: 80px 0;
}

.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
  opacity: 0;
  transform: translateY(10px);
}

.faq-item.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.4s, transform 0.4s;
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-dark);
  text-align: left;
}

.faq-question:hover {
  color: var(--color-primary);
}

.faq-chevron {
  flex-shrink: 0;
  transition: transform 0.3s;
  color: var(--color-text-light);
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-item.open .faq-answer {
  max-height: 200px;
}

.faq-answer p {
  padding-bottom: 20px;
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ── Trust Section ── */
.trust-section {
  padding: 80px 0;
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.trust-card {
  text-align: center;
  padding: 32px 24px;
  opacity: 0;
  transform: translateY(15px);
  transition: opacity 0.4s, transform 0.4s;
}

.trust-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.trust-icon {
  width: 56px;
  height: 56px;
  background: var(--color-primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  color: var(--color-primary);
}

.trust-card h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.trust-card p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* ── Bottom CTA ── */
.bottom-cta {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  text-align: center;
}

.bottom-cta-title {
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.bottom-cta-text {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 32px;
}

.bottom-cta-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ── Footer ── */
.site-footer {
  background: var(--color-dark);
  color: #fff;
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.footer-logo .logo-text {
  color: #fff;
  font-size: 1.25rem;
  font-weight: 700;
}

.footer-desc {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.6;
  max-width: 280px;
}

.footer-links h4 {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
  color: rgba(255, 255, 255, 0.4);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.7);
  transition: color 0.2s;
}

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

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.4);
  text-align: center;
}

/* ── Animations ── */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Responsive: Tablet ── */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    display: none;
  }

  .pain-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

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

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

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

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

/* ── Responsive: Mobile ── */
@media (max-width: 768px) {
  .main-nav,
  .header-actions {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .hero {
    min-height: 60vh;
    padding: 48px 0;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-title br {
    display: none;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .section-subtitle {
    font-size: 1rem;
    margin-bottom: 32px;
  }

  .pain-section,
  .solution-section,
  .roi-section,
  .modules-section,
  .use-cases-section,
  .onehr-cases-section,
  .trust-section,
  .faq-section {
    padding: 48px 0;
  }

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

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

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

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

  .use-cases-grid {
    grid-template-columns: 1fr;
  }

  .onehr-cases-grid {
    grid-template-columns: 1fr;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .bottom-cta-title {
    font-size: 1.5rem;
  }
}

/* ── Responsive: Small ── */
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

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

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

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

  .bottom-cta-actions {
    flex-direction: column;
    align-items: center;
  }
}