/* ===================================================================
   KwachaAI Landing Page — Design System
   =================================================================== */

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

/* ---------- Custom Properties ---------- */
:root {
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Brand palette */
  --accent: #e96f3e;
  --accent-light: #ff9a6c;
  --accent-glow: rgba(233, 111, 62, 0.25);
  --accent-subtle: rgba(233, 111, 62, 0.08);

  /* Dark theme */
  --bg-deep: #08080c;
  --bg-primary: #0d0d12;
  --bg-surface: #14141a;
  --bg-card: #1a1a22;
  --bg-card-hover: #1f1f28;
  --border-default: rgba(255, 255, 255, 0.06);
  --border-strong: rgba(255, 255, 255, 0.1);
  --text-primary: #f0f0f4;
  --text-secondary: #a0a0b0;
  --text-tertiary: #6b6b80;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;

  /* Layout */
  --max-width: 1200px;
  --section-padding: var(--space-24) var(--space-6);

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 999px;

  /* Motion */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --duration: 0.3s;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* ---------- Utility ---------- */
.container {
  width: min(var(--max-width), 100%);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.section {
  padding: var(--section-padding);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

/* ---------- Background effects ---------- */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
  z-index: 0;
}

.bg-glow {
  position: fixed;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(ellipse, var(--accent-glow), transparent 70%);
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

/* ===================================================================
   NAVBAR
   =================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-4) 0;
  background: rgba(8, 8, 12, 0.7);
  backdrop-filter: blur(20px) saturate(1.3);
  -webkit-backdrop-filter: blur(20px) saturate(1.3);
  border-bottom: 1px solid var(--border-default);
  transition: background var(--duration) var(--ease);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.navbar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

.navbar__logo {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.navbar__link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--duration) var(--ease);
}

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

.navbar__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-pill);
  background: var(--accent);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--duration) var(--ease);
}

.navbar__cta:hover {
  background: var(--accent-light);
  box-shadow: 0 0 24px var(--accent-glow);
  transform: translateY(-1px);
}

.navbar__mobile-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
}

.navbar__mobile-toggle svg {
  width: 24px;
  height: 24px;
}

/* ===================================================================
   HERO
   =================================================================== */
.hero {
  position: relative;
  padding: calc(100px + var(--space-24)) 0 var(--space-16);
  text-align: center;
  z-index: 1;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-strong);
  background: var(--bg-card);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
}

.hero__badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #34d399;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.2); }
}

.hero__title {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.08;
  margin-bottom: var(--space-6);
  max-width: 800px;
  margin-inline: auto;
}

.hero__title-accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-10);
  line-height: 1.7;
}

.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-16);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-pill);
  font-size: 1rem;
  font-weight: 600;
  transition: all var(--duration) var(--ease);
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 16px rgba(233, 111, 62, 0.3);
}

.btn--primary:hover {
  background: var(--accent-light);
  box-shadow: 0 8px 32px rgba(233, 111, 62, 0.4);
  transform: translateY(-2px);
}

.btn--secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
}

.btn--secondary:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

.btn svg {
  width: 20px;
  height: 20px;
}

.hero__screenshot-wrapper {
  position: relative;
  max-width: 1000px;
  margin: 0 auto;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--border-strong);
  box-shadow:
    0 32px 80px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 255, 255, 0.04) inset;
}

/* ---- Carousel ---- */
.hero__carousel {
  position: relative;
  width: 100%;
  aspect-ratio: 1919 / 1020;
  background: linear-gradient(180deg, rgba(20, 20, 26, 0.96), rgba(13, 13, 18, 0.98));
}

.hero__carousel-slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: linear-gradient(180deg, rgba(20, 20, 26, 0.95), rgba(13, 13, 18, 0.98));
  opacity: 0;
  transition: opacity 0.9s ease;
  pointer-events: none;
}

.hero__carousel-slide--active {
  opacity: 1;
  pointer-events: auto;
}

/* ---- Indicator pills ---- */
.hero__carousel-indicators {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
  z-index: 3;
}

.hero__carousel-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-pill);
  background: rgba(13, 13, 18, 0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
}

.hero__carousel-pill:hover {
  background: rgba(13, 13, 18, 0.85);
  color: var(--text-primary);
}

.hero__carousel-pill--active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.hero__carousel-pill--active:hover {
  background: var(--accent-light);
  border-color: var(--accent-light);
  color: #fff;
}

.hero__carousel-pill svg {
  width: 14px;
  height: 14px;
}

.hero__screenshot-glow {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, var(--bg-deep) 100%);
  pointer-events: none;
}

/* ===================================================================
   TRUST BAR
   =================================================================== */
.trust {
  text-align: center;
  padding: var(--space-12) 0 var(--space-20);
  z-index: 1;
  position: relative;
}

.trust__label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-6);
}

.trust__logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-12);
  flex-wrap: wrap;
  opacity: 0.5;
}

.trust__logo {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.trust__logo svg {
  width: 24px;
  height: 24px;
}

/* ===================================================================
   FEATURES SECTION
   =================================================================== */
.features {
  position: relative;
  z-index: 1;
}

.features__header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-4);
}

.section__title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
}

.section__subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin-inline: auto;
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.feature-card {
  position: relative;
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  transition: all var(--duration) var(--ease);
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--duration) var(--ease);
}

.feature-card:hover {
  border-color: var(--border-strong);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
}

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

.feature-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--accent-subtle);
  color: var(--accent);
  margin-bottom: var(--space-5);
}

.feature-card__icon svg {
  width: 24px;
  height: 24px;
}

.feature-card__title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.feature-card__desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===================================================================
   MODES SECTION
   =================================================================== */
.modes {
  position: relative;
  z-index: 1;
}

.modes__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.mode-card {
  padding: var(--space-10) var(--space-8);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-default);
  background: linear-gradient(160deg, var(--bg-card), var(--bg-surface));
  text-align: center;
  transition: all var(--duration) var(--ease);
}

.mode-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
}

.mode-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--accent-subtle);
  color: var(--accent);
  margin: 0 auto var(--space-5);
}

.mode-card__icon svg {
  width: 28px;
  height: 28px;
}

.mode-card__name {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.mode-card__desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===================================================================
   SHOWCASE SECTION
   =================================================================== */
.showcase {
  position: relative;
  z-index: 1;
}

.showcase__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.showcase__text {
  max-width: 500px;
}

.showcase__visual {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--border-strong);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.4);
  aspect-ratio: 16/10;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
}

.showcase__placeholder {
  text-align: center;
  color: var(--text-tertiary);
  padding: var(--space-8);
}

.showcase__placeholder-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
}

.showcase__placeholder-text {
  font-size: 0.9rem;
}

/* ===================================================================
   GALLERY SECTION
   =================================================================== */
.gallery {
  position: relative;
  z-index: 1;
}

.gallery__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

.gallery__item {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-default);
  background: var(--bg-card);
  aspect-ratio: 16 / 10;
  cursor: default;
  transition: all var(--duration) var(--ease);
}

.gallery__item:hover {
  border-color: var(--border-strong);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  transform: translateY(-3px);
}

.gallery__item img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: linear-gradient(180deg, rgba(20, 20, 26, 0.95), rgba(13, 13, 18, 0.98));
  transition: transform 0.4s var(--ease);
}

.gallery__item:hover img {
  transform: scale(1.04);
}

.gallery__placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  font-size: 0.9rem;
}

.gallery__caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-3) var(--space-4);
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  opacity: 0;
  transform: translateY(4px);
  transition: all var(--duration) var(--ease);
}

.gallery__item:hover .gallery__caption {
  opacity: 1;
  transform: translateY(0);
}

/* ===================================================================
   DOWNLOAD / CTA SECTION
   =================================================================== */
.cta {
  position: relative;
  z-index: 1;
}

.cta__card {
  position: relative;
  padding: var(--space-20) var(--space-12);
  border-radius: var(--radius-xl);
  background: linear-gradient(160deg, #1a1520, #14141a);
  border: 1px solid var(--border-strong);
  text-align: center;
  overflow: hidden;
}

.cta__card::before {
  content: '';
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 300px;
  background: radial-gradient(ellipse, rgba(233, 111, 62, 0.15), transparent 70%);
  pointer-events: none;
}

.cta__title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
  position: relative;
}

.cta__subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto var(--space-10);
  position: relative;
}

.cta__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  position: relative;
}

.cta__note {
  margin-top: var(--space-6);
  font-size: 0.85rem;
  color: var(--text-tertiary);
  position: relative;
}

/* ===================================================================
   FAQ
   =================================================================== */
.faq__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-8);
  margin-top: var(--space-12);
}

.faq__item {
  background: var(--bg-card);
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-default);
}

.faq__question {
  font-size: var(--space-5);
  font-weight: 600;
  margin-bottom: var(--space-4);
  color: var(--text-primary);
}

.faq__answer {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.faq__answer strong {
  color: var(--accent);
}

/* ===================================================================
   FOOTER
   =================================================================== */
.footer {
  position: relative;
  z-index: 1;
  padding: var(--space-12) 0;
  border-top: 1px solid var(--border-default);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 600;
}

.footer__links {
  display: flex;
  gap: var(--space-6);
  list-style: none;
}

.footer__link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--duration) var(--ease);
}

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

.footer__copy {
  font-size: 0.85rem;
  color: var(--text-tertiary);
}

/* ===================================================================
   ANIMATIONS (scroll reveal)
   =================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

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

/* ===================================================================
   RESPONSIVE
   =================================================================== */
@media (max-width: 900px) {
  :root {
    --section-padding: var(--space-16) var(--space-5);
  }

  .features__grid,
  .modes__grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

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

  .showcase__content {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .navbar__links {
    display: none;
  }

  .navbar__cta {
    display: none;
  }

  .navbar__mobile-toggle {
    display: flex;
  }

  .navbar__links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(8, 8, 12, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: var(--space-6);
    border-bottom: 1px solid var(--border-default);
    gap: var(--space-4);
  }

  .hero__actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .cta__card {
    padding: var(--space-12) var(--space-6);
  }

  .footer__inner {
    flex-direction: column;
    text-align: center;
    gap: var(--space-6);
  }
}

@media (max-width: 600px) {
  .hero {
    padding: calc(80px + var(--space-16)) 0 var(--space-12);
  }

  .trust__logos {
    gap: var(--space-6);
  }

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