/* ============================================
   LOCUS - Birdwatching Landing Page CSS
   ============================================ */

/* ── Variables ── */
:root {
  --bw-primary: #1a2332;
  --bw-primary-light: #2a3a4e;
  --bw-accent: #ce2125;
  --bw-accent-light: #e02a2e;
  --bw-green: #2d6a4f;
  --bw-green-light: #40916c;
  --bw-green-bg: rgba(45, 106, 79, 0.08);
  --bw-white: #ffffff;
  --bw-bg: #f9fafb;
  --bw-bg-alt: #f0f2f0;
  --bw-surface: #ffffff;
  --bw-text: #1a1a1a;
  --bw-text-sec: #5a5a5a;
  --bw-text-muted: #8a8a8a;
  --bw-border: #e2e5e0;
  --bw-whatsapp: #25d366;
  --bw-shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --bw-shadow-md: 0 4px 20px rgba(0,0,0,0.08);
  --bw-shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
  --bw-radius: 12px;
  --bw-radius-lg: 20px;
  --bw-transition: all 0.3s ease;
  --bw-font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ── Reset ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  font-family: var(--bw-font);
  color: var(--bw-text);
  background: var(--bw-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: var(--bw-transition); }
ul { list-style: none; }
h1, h2, h3, h4 { font-family: var(--bw-font); font-weight: 700; line-height: 1.2; }
h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.6rem, 4vw, 2.5rem); }

.bw-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.bw-highlight { color: var(--bw-accent); }
.bw-highlight-light { color: var(--bw-whatsapp); }

/* ── Header ── */
.bw-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(26, 35, 50, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  transition: var(--bw-transition);
}
.bw-header.scrolled {
  background: rgba(26, 35, 50, 0.98);
  box-shadow: var(--bw-shadow-lg);
}
.bw-header .bw-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.bw-logo img { height: 44px; width: auto; }

.bw-nav { display: flex; align-items: center; gap: 4px; }
.bw-nav-link {
  color: rgba(255,255,255,0.7);
  padding: 8px 16px;
  border-radius: 100px;
  font-size: 15px;
  font-weight: 500;
}
.bw-nav-link:hover { color: var(--bw-white); background: rgba(255,255,255,0.1); }

.bw-btn-header {
  background: var(--bw-whatsapp);
  color: var(--bw-white);
  padding: 8px 20px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-left: 8px;
}
.bw-btn-header:hover { background: #1fb855; }

.bw-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.bw-menu-toggle span {
  width: 22px;
  height: 2px;
  background: var(--bw-white);
  border-radius: 2px;
  transition: var(--bw-transition);
}
.bw-menu-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.bw-menu-toggle.open span:nth-child(2) { opacity: 0; }
.bw-menu-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ── Buttons ── */
.bw-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 100px;
  font-family: var(--bw-font);
  font-size: 15px;
  font-weight: 600;
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--bw-transition);
  white-space: nowrap;
}
.bw-btn-lg { padding: 16px 36px; font-size: 16px; }

.bw-btn-primary {
  background: var(--bw-accent);
  color: var(--bw-white);
  border-color: var(--bw-accent);
}
.bw-btn-primary:hover {
  background: var(--bw-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(206, 33, 37, 0.35);
}

.bw-btn-whatsapp {
  background: var(--bw-whatsapp);
  color: var(--bw-white);
  border-color: var(--bw-whatsapp);
}
.bw-btn-whatsapp:hover {
  background: #1fb855;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 211, 102, 0.35);
}

.bw-btn-outline {
  background: transparent;
  color: var(--bw-white);
  border-color: rgba(255,255,255,0.3);
}
.bw-btn-outline:hover {
  background: var(--bw-white);
  color: var(--bw-primary);
  border-color: var(--bw-white);
}

.bw-btn-outline-light {
  background: transparent;
  color: var(--bw-white);
  border-color: rgba(255,255,255,0.3);
}
.bw-btn-outline-light:hover {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.5);
}

/* ── Hero ── */
.bw-hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background-color: var(--bw-primary);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  overflow: hidden;
}
.bw-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(13,21,32,0.55) 0%, rgba(13,21,32,0.7) 100%);
}
.bw-hero-content {
  position: relative;
  text-align: center;
  color: var(--bw-white);
  padding: 140px 0 80px;
}

.bw-hero-notice {
  display: inline-block;
  background: rgba(37, 211, 102, 0.12);
  border: 1px solid rgba(37, 211, 102, 0.25);
  color: var(--bw-whatsapp);
  padding: 8px 20px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.3px;
  margin-bottom: 24px;
}

.bw-hero h1 { margin-bottom: 20px; font-weight: 800; }
.bw-hero-sub {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.7);
  max-width: 600px;
  margin: 0 auto 36px;
}
.bw-hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.bw-hero-tags {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.bw-hero-tags span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.7);
  padding: 8px 16px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
}
.bw-hero-tags span i { color: var(--bw-whatsapp); }

/* ── Sections ── */
.bw-section { padding: 80px 0; }
.bw-section-dark { background: var(--bw-primary); color: var(--bw-white); }

.bw-section-img {
  position: relative;
  background-color: var(--bw-primary);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  color: var(--bw-white);
}
.bw-section-img::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(13, 21, 32, 0.7);
  z-index: 1;
}
.bw-section-img > .bw-container {
  position: relative;
  z-index: 2;
}

.bw-section-img-blur::before {
  background: rgba(13, 21, 32, 0.72);
}
.bw-section-for { background: var(--bw-bg-alt); }

.bw-section-field {
  color: var(--bw-white);
}

.bw-section-avistar { background: var(--bw-bg-alt); }

.bw-section-cta {
  color: var(--bw-white);
  background-position: center 30% !important;
}

.bw-section-header { text-align: center; margin-bottom: 48px; }
.bw-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(206, 33, 37, 0.08);
  color: var(--bw-accent);
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.bw-badge-light {
  background: rgba(37, 211, 102, 0.12);
  color: var(--bw-whatsapp);
}
.bw-section-header h2 { margin-bottom: 12px; }
.bw-lead { color: var(--bw-text-sec); font-size: 1.05rem; max-width: 700px; margin: 0 auto; }

/* ── About Grid ── */
.bw-about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.bw-about-card {
  background: var(--bw-surface);
  border: 1px solid var(--bw-border);
  border-radius: var(--bw-radius);
  padding: 32px;
  transition: var(--bw-transition);
}
.bw-about-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--bw-shadow-lg);
  border-color: var(--bw-accent);
}
.bw-about-icon {
  width: 56px;
  height: 56px;
  background: rgba(206, 33, 37, 0.08);
  border-radius: var(--bw-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bw-accent);
  font-size: 22px;
  margin-bottom: 20px;
}
.bw-about-card h3 { margin-bottom: 8px; }
.bw-about-card p { color: var(--bw-text-sec); font-size: 15px; }

/* ── Institutional Grid ── */
.bw-institutional-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 60px;
  align-items: center;
}
.bw-inst-content h2 { margin-bottom: 24px; color: var(--bw-white); }
.bw-check-list { display: flex; flex-direction: column; gap: 14px; margin-bottom: 32px; }
.bw-check-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 16px;
  color: rgba(255,255,255,0.85);
}
.bw-check-list li i { color: var(--bw-whatsapp); margin-top: 4px; flex-shrink: 0; }

.bw-inst-stats { display: flex; flex-direction: column; gap: 20px; }
.bw-stat-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--bw-radius);
  padding: 28px;
  text-align: center;
}
.bw-stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--bw-whatsapp);
  line-height: 1;
  margin-bottom: 6px;
}
.bw-stat-label { font-size: 14px; color: rgba(255,255,255,0.6); }

/* ── Differentials Grid ── */
.bw-diff-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}
.bw-diff-card {
  background: var(--bw-surface);
  border: 1px solid var(--bw-border);
  border-radius: var(--bw-radius);
  padding: 32px;
  transition: var(--bw-transition);
}
.bw-diff-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--bw-shadow-lg);
  border-color: var(--bw-green);
}
.bw-diff-icon {
  width: 56px;
  height: 56px;
  background: var(--bw-green-bg);
  border-radius: var(--bw-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bw-green);
  font-size: 22px;
  margin-bottom: 20px;
}
.bw-diff-card h3 { margin-bottom: 8px; font-size: 1.1rem; }
.bw-diff-card p { color: var(--bw-text-sec); font-size: 15px; }

/* ── Field Section ── */
.bw-field-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}
.bw-field-content h2 { margin-bottom: 20px; }
.bw-field-quote {
  font-size: 1.2rem;
  font-style: italic;
  color: rgba(255,255,255,0.8);
  margin-bottom: 16px;
  padding: 0 20px;
}
.bw-field-text { color: rgba(255,255,255,0.7); margin-bottom: 32px; }

.bw-field-features {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
}
.bw-field-feat {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  padding: 10px 20px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 500;
}
.bw-field-feat i { color: var(--bw-whatsapp); }

/* ── Partnership ── */
.bw-partnership-block {
  text-align: center;
  max-width: 750px;
  margin: 0 auto;
  background: var(--bw-surface);
  border: 1px solid var(--bw-border);
  border-radius: var(--bw-radius-lg);
  padding: 48px;
}
.bw-partnership-icon {
  width: 64px;
  height: 64px;
  background: rgba(206, 33, 37, 0.08);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bw-accent);
  font-size: 24px;
  margin: 0 auto 20px;
}
.bw-partnership-block h2 { margin-bottom: 16px; }
.bw-partnership-block p { color: var(--bw-text-sec); margin-bottom: 28px; font-size: 16px; }

/* ── Avistar ── */
.bw-avistar-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 60px;
  align-items: center;
}
.bw-avistar-content h2 { margin-bottom: 16px; }
.bw-avistar-content p { color: var(--bw-text-sec); margin-bottom: 24px; }
.bw-avistar-details { display: flex; flex-direction: column; gap: 12px; margin-bottom: 28px; }
.bw-avistar-detail {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  font-weight: 500;
}
.bw-avistar-detail i { color: var(--bw-accent); width: 20px; text-align: center; }

.bw-avistar-visual { display: flex; align-items: center; justify-content: center; }
.bw-avistar-img {
  border-radius: var(--bw-radius-lg);
  width: 100%;
  max-width: 380px;
  box-shadow: var(--bw-shadow-lg);
  transition: var(--bw-transition);
}
.bw-avistar-img:hover {
  transform: scale(1.03);
  box-shadow: 0 16px 50px rgba(0,0,0,0.2);
}

/* ── Who Is This For ── */
.bw-for-grid {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}
.bw-for-card {
  background: var(--bw-surface);
  border: 1px solid var(--bw-border);
  border-radius: var(--bw-radius);
  padding: 28px 36px;
  text-align: center;
  transition: var(--bw-transition);
  min-width: 180px;
}
.bw-for-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--bw-shadow-lg);
  border-color: var(--bw-accent);
}
.bw-for-card i {
  font-size: 28px;
  color: var(--bw-accent);
  margin-bottom: 12px;
  display: block;
}
.bw-for-card h3 { font-size: 15px; }

/* ── CTA ── */
.bw-cta-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}
.bw-cta-content h2 { margin-bottom: 12px; }
.bw-cta-content > p { color: rgba(255,255,255,0.7); margin-bottom: 36px; font-size: 1.1rem; }
.bw-cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ── Footer ── */
.bw-footer {
  background: var(--bw-primary);
  color: rgba(255,255,255,0.7);
  padding: 64px 0 24px;
}
.bw-footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.bw-footer-logo { height: 40px; width: auto; margin-bottom: 16px; }
.bw-footer-col p { font-size: 14px; line-height: 1.7; }
.bw-footer-col h4 { color: var(--bw-white); margin-bottom: 16px; font-size: 16px; }
.bw-footer-col ul { display: flex; flex-direction: column; gap: 8px; }
.bw-footer-col ul li { font-size: 14px; display: flex; align-items: center; gap: 8px; }
.bw-footer-col ul li i { color: var(--bw-accent); width: 16px; }
.bw-footer-col ul li a:hover { color: var(--bw-accent); }
.bw-footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  text-align: center;
  font-size: 14px;
}

/* ── WhatsApp Float ── */
.bw-whatsapp-float {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 60px;
  height: 60px;
  background: var(--bw-whatsapp);
  color: var(--bw-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  box-shadow: 0 4px 20px rgba(37, 211, 102, 0.4);
  z-index: 900;
  transition: var(--bw-transition);
  animation: bw-pulse 2s infinite;
}
.bw-whatsapp-float:hover { transform: scale(1.1); }

@keyframes bw-pulse {
  0%, 100% { box-shadow: 0 4px 20px rgba(37, 211, 102, 0.4); }
  50% { box-shadow: 0 4px 30px rgba(37, 211, 102, 0.6); }
}

/* ── Scroll Reveal ── */
.bw-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.bw-reveal.visible { opacity: 1; transform: translateY(0); }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .bw-institutional-grid { grid-template-columns: 1fr; gap: 40px; }
  .bw-avistar-grid { grid-template-columns: 1fr; gap: 40px; }
  .bw-inst-stats { flex-direction: row; }
  .bw-stat-card { flex: 1; }
  .bw-footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .bw-nav {
    display: none;
    flex-direction: column;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bw-primary);
    padding: 20px 24px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    z-index: 1001;
  }
  .bw-nav.open { display: flex; animation: bwSlideDown 0.3s ease; }
  @keyframes bwSlideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
  }
  .bw-btn-header { width: 100%; justify-content: center; margin-left: 0; margin-top: 8px; }
  .bw-menu-toggle { display: flex; }

  .bw-hero-content { padding: 120px 0 60px; }
  .bw-hero h1 { font-size: 1.8rem; }
  .bw-hero-tags { gap: 8px; }
  .bw-hero-tags span { font-size: 12px; padding: 6px 12px; }

  .bw-about-grid { grid-template-columns: 1fr; }
  .bw-diff-grid { grid-template-columns: 1fr; }
  .bw-inst-stats { flex-direction: column; }
  .bw-field-features { gap: 12px; }
  .bw-for-grid { gap: 12px; }
  .bw-for-card { min-width: 140px; padding: 20px 16px; }
  .bw-cta-buttons { flex-direction: column; align-items: center; }
  .bw-footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .bw-section { padding: 60px 0; }
  .bw-avistar-visual { display: none; }
}

@media (max-width: 480px) {
  .bw-hero h1 { font-size: 1.5rem; }
  .bw-hero-buttons { flex-direction: column; align-items: center; }
}