/* ============================================
   Splitora — Landing Page Stylesheet
   Pure CSS, mobile-first, no frameworks
   ============================================ */

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

/* --- CSS Custom Properties --- */
:root {
  /* Brand Colors */
  --color-primary: #4F46E5;
  --color-primary-dark: #3730A3;
  --color-primary-light: #818CF8;
  --color-secondary: #10B981;
  --color-secondary-dark: #059669;

  /* Neutrals */
  --color-white: #FFFFFF;
  --color-gray-50: #F8F8FF;
  --color-gray-100: #F1F0FE;
  --color-gray-200: #E5E4FB;
  --color-gray-400: #9CA3AF;
  --color-gray-600: #4B5563;
  --color-gray-700: #374151;
  --color-gray-800: #1F2937;
  --color-gray-900: #111827;

  /* Semantic */
  --color-surface: var(--color-gray-50);
  --color-text-primary: var(--color-gray-900);
  --color-text-secondary: var(--color-gray-600);
  --color-border: var(--color-gray-200);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(79, 70, 229, 0.10), 0 2px 6px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 30px rgba(79, 70, 229, 0.12), 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-card: 0 2px 8px rgba(79, 70, 229, 0.08), 0 1px 3px rgba(0, 0, 0, 0.05);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;

  /* Layout */
  --container-max: 1120px;
  --nav-height: 64px;
}

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

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  background-color: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* --- Layout Utilities --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-8);
  }
}

/* --- Scroll Fade-In Animation --- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-normal),
              box-shadow var(--transition-normal);
}

.nav.scrolled {
  border-color: var(--color-border);
  box-shadow: 0 1px 12px rgba(79, 70, 229, 0.08);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.nav__logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 18px;
  flex-shrink: 0;
}

/* Support SVG/PNG image logos using the same utility class */
img.nav__logo-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  display: inline-block;
  background: none;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav__links a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  padding: var(--space-1) 0;
  position: relative;
}

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transform: scaleX(0);
  transition: transform var(--transition-fast);
}

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

.nav__links a:hover::after {
  transform: scaleX(1);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  position: relative;
  overflow: hidden;
  padding: var(--space-20) 0 var(--space-24);
  background: linear-gradient(160deg, var(--color-gray-50) 0%, var(--color-gray-100) 50%, #EEF2FF 100%);
}

.hero__bg-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.3;
  pointer-events: none;
}

.hero__bg-blob--1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--color-primary-light), transparent);
  top: -200px;
  right: -100px;
}

.hero__bg-blob--2 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, var(--color-secondary), transparent);
  bottom: -100px;
  left: -50px;
}

.hero__inner {
  position: relative;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-gray-200);
  color: var(--color-primary);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.hero__title {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--color-gray-900);
  margin-bottom: var(--space-5);
}

.hero__title .highlight {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@media (min-width: 640px) {
  .hero__title {
    font-size: var(--font-size-4xl);
  }
}

@media (min-width: 1024px) {
  .hero__title {
    font-size: var(--font-size-5xl);
  }
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 520px;
  margin: 0 auto var(--space-10);
  line-height: 1.7;
}

.hero__cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

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

/* Download Badge Buttons */
.badge-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-gray-900);
  color: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-5);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: background var(--transition-fast),
              transform var(--transition-fast),
              box-shadow var(--transition-fast);
  min-width: 160px;
  text-align: left;
  border: 1.5px solid rgba(255, 255, 255, 0.1);
}

.badge-btn:hover {
  background: var(--color-gray-700);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.badge-btn:active {
  transform: translateY(0);
}

.badge-btn__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
}

.badge-btn__text {
  display: flex;
  flex-direction: column;
}

.badge-btn__label {
  font-size: 10px;
  font-weight: 400;
  opacity: 0.8;
  letter-spacing: 0.02em;
}

.badge-btn__store {
  font-size: var(--font-size-base);
  font-weight: 700;
  line-height: 1.2;
}

/* ============================================
   SECTION SHARED STYLES
   ============================================ */
section {
  padding: var(--space-20) 0;
}

.section-label {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.section-title {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-gray-900);
  margin-bottom: var(--space-4);
  line-height: 1.2;
}

@media (min-width: 768px) {
  .section-title {
    font-size: var(--font-size-3xl);
  }
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 560px;
}

.section-header {
  margin-bottom: var(--space-12);
  text-align: center;
}

.section-header .section-subtitle {
  margin: 0 auto;
}

/* ============================================
   FEATURES SECTION
   ============================================ */
.features {
  background: var(--color-white);
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

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

@media (min-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card {
  background: var(--color-white);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: border-color var(--transition-normal),
              box-shadow var(--transition-normal),
              transform var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.feature-card:hover {
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-card__icon {
  width: 52px;
  height: 52px;
  background: var(--color-gray-100);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: var(--space-5);
  transition: background var(--transition-normal);
}

.feature-card:hover .feature-card__icon {
  background: var(--color-gray-200);
}

.feature-card__title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: var(--space-3);
}

.feature-card__desc {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* ============================================
   HOW IT WORKS SECTION
   ============================================ */
.how-it-works {
  background: var(--color-surface);
}

.steps-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  position: relative;
}

@media (min-width: 768px) {
  .steps-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
  }

  .steps-grid::before {
    content: '';
    position: absolute;
    top: 28px;
    left: calc(16.666% + 28px);
    right: calc(16.666% + 28px);
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary-light), var(--color-primary));
    opacity: 0.3;
    z-index: 0;
  }
}

.step-card {
  text-align: center;
  position: relative;
  z-index: 1;
}

.step-card__number {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: var(--color-white);
  font-size: var(--font-size-xl);
  font-weight: 800;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-5);
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
}

.step-card__emoji {
  font-size: 28px;
  margin-bottom: var(--space-3);
}

.step-card__title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: var(--space-2);
}

.step-card__desc {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.65;
  max-width: 240px;
  margin: 0 auto;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--color-gray-900);
  color: var(--color-white);
  padding: var(--space-12) 0;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-5);
  text-align: center;
}

@media (min-width: 640px) {
  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer__logo {
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: -0.02em;
}

.footer__logo span {
  color: var(--color-primary-light);
}

.footer__links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex-wrap: wrap;
  justify-content: center;
}

.footer__links a {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition-fast);
}

.footer__links a:hover {
  color: var(--color-white);
}

.footer__copy {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.4);
  margin-top: var(--space-6);
  text-align: center;
}

/* Divider above copyright */
.footer__divider {
  width: 100%;
  height: 1px;
  background: rgba(255, 255, 255, 0.08);
  margin-top: var(--space-8);
  margin-bottom: var(--space-6);
}

/* ============================================
   PRIVACY POLICY PAGE
   ============================================ */
.policy-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.policy-page main {
  flex: 1;
}

.policy-hero {
  background: linear-gradient(160deg, var(--color-gray-50) 0%, var(--color-gray-100) 100%);
  padding: var(--space-16) 0 var(--space-12);
  border-bottom: 1px solid var(--color-border);
}

.policy-hero__title {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--color-gray-900);
  margin-bottom: var(--space-3);
}

.policy-hero__meta {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.policy-hero__meta strong {
  color: var(--color-primary);
}

.policy-content {
  padding: var(--space-12) 0 var(--space-20);
  max-width: 760px;
}

.policy-section {
  margin-bottom: var(--space-10);
}

.policy-section h2 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-gray-100);
}

.policy-section p {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: var(--space-4);
}

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

.policy-section ul {
  list-style: disc;
  padding-left: var(--space-6);
  margin-bottom: var(--space-4);
}

.policy-section ul li {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: var(--space-2);
}

.policy-section a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: rgba(79, 70, 229, 0.3);
  transition: text-decoration-color var(--transition-fast);
}

.policy-section a:hover {
  text-decoration-color: var(--color-primary);
}

.policy-toc {
  background: var(--color-gray-100);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-10);
}

.policy-toc h3 {
  font-size: var(--font-size-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-gray-700);
  margin-bottom: var(--space-4);
}

.policy-toc ol {
  padding-left: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.policy-toc ol li a {
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.policy-toc ol li a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* Responsive Typography: Privacy Page */
@media (min-width: 768px) {
  .policy-hero__title {
    font-size: var(--font-size-4xl);
  }
}

/* ============================================
   FOCUS STYLES (Accessibility)
   ============================================ */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ============================================
   MEDIA QUERIES — Additional Breakpoints
   ============================================ */
@media (min-width: 1280px) {
  .container {
    padding: 0 var(--space-10);
  }
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }

  html {
    scroll-behavior: auto;
  }

  .badge-btn:hover,
  .feature-card:hover {
    transform: none;
  }
}