/* 
   SIVACE Landing Page Design System & Stylesheet
   Theme: Ultra-clean modern SaaS (Light theme only)
   Inspiration: Linear, Stripe, Vercel, Arc Browser, modern AI startups
*/

/* --- Google Fonts Import --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Outfit:wght@500;600;700;800&display=swap');

/* --- Custom Variables & Theme Tokens --- */
:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  /* Color Palette */
  --bg-color: #FAFBFD;
  --primary-color: #5B5FFF;
  /* Electric Indigo */
  --primary-glow: rgba(91, 95, 255, 0.15);
  --primary-hover: #474BE0;
  --secondary-color: #39D98A;
  /* Emerald Green */
  --secondary-glow: rgba(57, 217, 138, 0.15);
  --text-primary: #101114;
  /* Near Black */
  --text-secondary: #5C6270;
  /* Muted Grey */
  --border-color: rgba(16, 17, 20, 0.06);
  --border-glow: rgba(91, 95, 255, 0.08);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 16px 40px rgba(91, 95, 255, 0.05), 0 4px 12px rgba(0, 0, 0, 0.03);
  --shadow-premium: 0 24px 60px rgba(91, 95, 255, 0.07), 0 8px 24px rgba(0, 0, 0, 0.02);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);

  /* Layout Spacing */
  --container-max-width: 1200px;
  --section-padding: 140px;
  --section-padding-mobile: 80px;
  --border-radius-lg: 24px;
  --border-radius-md: 16px;
  --border-radius-sm: 12px;
}

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

html,
body {
  overflow-x: hidden;
  width: 100%;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
}

/* Base Headings & Hierarchy */
h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

p {
  color: var(--text-secondary);
  font-size: 1.125rem;
  line-height: 1.7;
}

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

/* --- Global Layout Utility --- */
.container {
  width: 90%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  position: relative;
}

/* --- Premium Buttons System --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: 1px solid transparent;
  gap: 8px;
}

.btn-primary {
  background-color: var(--primary-color);
  color: #FFFFFF;
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--primary-glow);
}

.btn-secondary {
  background-color: #FFFFFF;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: #FAFAFB;
  border-color: rgba(16, 17, 20, 0.12);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-icon {
  width: 20px;
  height: 20px;
  stroke-width: 2px;
}

/* --- Section Formatting --- */
section {
  padding: var(--section-padding) 0;
  position: relative;
  overflow: hidden;
}

@media (max-width: 768px) {
  section {
    padding: var(--section-padding-mobile) 0;
  }
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 80px auto;
}

.section-header h2 {
  font-size: 2.75rem;
  margin-bottom: 16px;
  letter-spacing: -0.03em;
}

@media (max-width: 768px) {
  .section-header h2 {
    font-size: 2.2rem;
  }
}

/* --- Background Gradient Glows --- */
.ambient-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(91, 95, 255, 0.05) 0%, rgba(250, 251, 253, 0) 70%);
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
  z-index: 0;
}

/* --- 1. NAVBAR --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  border-bottom: 1px solid transparent;
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(250, 251, 253, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 0;
  box-shadow: var(--shadow-sm);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  transition: padding var(--transition-normal);
}

.navbar.scrolled .container {
  padding: 8px 0;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-img {
  height: 32px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex: 1;
  margin-left: 48px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
  align-items: center;
}

.nav-link {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-btn-login {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px 16px;
}

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

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
}

@media (max-width: 991px) {
  .mobile-nav-toggle {
    display: block;
    color: var(--text-primary);
    z-index: 1001;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: #FAFBFD;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    flex-direction: column;
    padding: 32px 5%;
    align-items: stretch;
    gap: 28px;
    margin-left: 0;
    z-index: 1000;
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-links {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
    width: 100%;
  }

  .nav-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 100%;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    align-items: stretch;
  }

  .nav-actions .btn {
    width: 100%;
    text-align: center;
  }
}

/* --- 9. FOOTER --- */
.footer {
  background: #FFFFFF;
  border-top: 1px solid var(--border-color);
  padding: 80px 0 40px 0;
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr) 1.5fr;
  gap: 40px;
  margin-bottom: 60px;
}

@media (max-width: 991px) {
  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-logo-col p {
  font-size: 0.9rem;
  margin-top: 16px;
  max-width: 240px;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-col a {
  color: var(--text-secondary);
}

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

.footer-newsletter-col h4 {
  text-transform: none;
  letter-spacing: normal;
}

.footer-newsletter-col p {
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.newsletter-form {
  display: flex;
  gap: 8px;
}

.newsletter-input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  background-color: #FAFBFD;
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition-fast);
}

.newsletter-input:focus {
  border-color: var(--primary-color);
  background-color: #FFFFFF;
}

.newsletter-btn {
  background-color: var(--primary-color);
  color: #FFFFFF;
  border: none;
  padding: 0 16px;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-color);
  padding-top: 40px;
  flex-wrap: wrap;
  gap: 20px;
  color: var(--text-secondary);
}

.footer-socials {
  display: flex;
  gap: 16px;
}

.footer-social-link {
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

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

/* --- FAQ Accordion System --- */
.faq-section {
  background-color: var(--bg-color);
  padding: 100px 0;
  position: relative;
}

.faq-accordion {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.faq-item:hover {
  border-color: rgba(91, 95, 255, 0.2);
  box-shadow: var(--shadow-md);
}

.faq-item.active {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
}

.faq-question {
  width: 100%;
  padding: 24px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

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

.faq-icon-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(16, 17, 20, 0.03);
  color: var(--text-secondary);
  transition: all var(--transition-normal);
}

.faq-item.active .faq-icon-wrapper {
  background: var(--primary-glow);
  color: var(--primary-color);
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

.faq-answer-inner {
  padding: 0 32px 28px 32px;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.6;
}

.faq-action-wrapper {
  text-align: center;
  margin-top: 48px;
}

.faq-action-wrapper .btn {
  padding: 14px 28px;
  font-size: 1rem;
}