/* --- Variables --- */
:root {
  --bg: #0f1419;
  --bg-elevated: #1a222c;
  --bg-card: #232d3a;
  --text: #e8ecf0;
  --text-muted: #8b9aab;
  --accent: #f59e0b;
  --accent-hover: #fbbf24;
  --accent-soft: rgba(245, 158, 11, 0.15);
  --success: #22c55e;
  --border: rgba(139, 154, 171, 0.2);
  --font-sans: 'Outfit', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

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

ul, ol {
  list-style: none;
}

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

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(15, 20, 25, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1.125rem;
}

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

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color var(--transition);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition), transform 0.1s ease;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--accent-soft), transparent),
    radial-gradient(ellipse 60% 40% at 100% 50%, rgba(34, 197, 94, 0.08), transparent),
    radial-gradient(ellipse 40% 30% at 0% 80%, rgba(245, 158, 11, 0.06), transparent);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  padding: 6px 14px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.8125rem;
  font-weight: 500;
  border-radius: 100px;
  margin-bottom: 20px;
  font-family: var(--font-mono);
}

.hero-title {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.hero-title em {
  font-style: normal;
  color: var(--accent);
}

.hero-desc {
  color: var(--text-muted);
  font-size: 1.125rem;
  max-width: 440px;
  margin-bottom: 32px;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

/* Phone mockup --- */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.phone-mockup {
  --phone-w: 280px;
  width: var(--phone-w);
  background: var(--bg-elevated);
  border-radius: 36px;
  padding: 12px;
  box-shadow: var(--shadow), 0 0 0 1px var(--border);
}

.phone-screen {
  background: var(--bg-card);
  border-radius: 28px;
  overflow: hidden;
  min-height: 520px;
}

.mockup-header {
  display: flex;
  gap: 6px;
  padding: 16px 20px 12px;
}

.mockup-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  opacity: 0.6;
}

.mockup-content {
  padding: 0 20px 24px;
}

.mockup-challenge {
  background: var(--bg-elevated);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 20px;
  border: 1px solid var(--border);
}

.mockup-label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.mockup-title {
  display: block;
  font-weight: 600;
  font-size: 1rem;
  margin-top: 4px;
}

.mockup-progress {
  height: 6px;
  background: var(--bg);
  border-radius: 3px;
  margin-top: 12px;
  overflow: hidden;
}

.mockup-progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.5s ease;
}

.mockup-streak {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--accent);
  margin-top: 10px;
}

.mockup-tasks {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mockup-task {
  font-size: 0.875rem;
  color: var(--text-muted);
  padding: 10px 12px;
  background: var(--bg-elevated);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.mockup-task.done {
  color: var(--success);
  text-decoration: line-through;
  opacity: 0.85;
}

/* --- Features --- */
.features {
  padding: 100px 0;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  text-align: center;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-desc {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.0625rem;
  margin-bottom: 48px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: border-color var(--transition), transform 0.2s ease;
}

.feature-card:hover {
  border-color: rgba(245, 158, 11, 0.3);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.55;
}

/* --- How it works --- */
.how-it-works {
  padding: 100px 0;
  background: var(--bg-elevated);
}

.steps {
  max-width: 560px;
  margin: 0 auto;
}

.step {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}

.step:last-child {
  border-bottom: none;
}

.step-num {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.125rem;
  border-radius: var(--radius);
}

.step-content h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.step-content p {
  color: var(--text-muted);
  font-size: 0.9375rem;
}

/* --- CTA --- */
.cta {
  padding: 100px 0 80px;
}

.cta-inner {
  text-align: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 56px 32px;
}

.cta-title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  margin-bottom: 12px;
}

.cta-desc {
  color: var(--text-muted);
  font-size: 1.0625rem;
  margin-bottom: 32px;
}

.store-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  margin-bottom: 20px;
}

.store-badge {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 14px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.875rem;
  transition: border-color var(--transition), background var(--transition);
}

.store-badge:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.store-icon {
  font-size: 1.5rem;
}

.store-text strong {
  display: block;
  font-size: 0.9375rem;
}

.cta-note {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* --- Footer --- */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-logo .logo-img {
  width: 28px;
  height: 28px;
}

.footer-copy {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* --- Mobile --- */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.25s ease, opacity 0.25s ease, visibility 0.25s;
  }

  .nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

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

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

  .hero-visual {
    order: -1;
  }

  .phone-mockup {
    --phone-w: 260px;
  }

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

@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .store-badges {
    flex-direction: column;
  }

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