/* ========================================
   Pilot Colab — Landing Page Styles
   Based on Nabú Design System
   ======================================== */
:root {
  --color-primary: #34A953;
  --color-primary-light: #dcfce7;
  --color-primary-dark: #2d9348;
  --color-dark: #1e293b;
  --color-body: #1e293b;
  --color-muted: #64748b;
  --color-light: #94a3b8;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-border: #e2e8f0;
  --color-nav-bg: #1e293b;
  --color-nav-text: #f8fafc;
  --color-nav-text-muted: #94a3b8;
  --gradient-primary: linear-gradient(135deg, #34A953 0%, #2d9348 100%);
  --font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --radius-sm: 0.375rem; --radius-md: 0.75rem; --radius-lg: 1rem; --radius-xl: 1.5rem; --radius-full: 9999px;
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
  --nav-height: 72px;
  --container-max: 1100px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font-family); font-size: 1rem; line-height: 1.6; color: var(--color-body); background: var(--color-bg); overflow-x: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
code { background: var(--color-bg-alt); padding: 0.15em 0.4em; border-radius: var(--radius-sm); font-size: 0.85em; border: 1px solid var(--color-border); }
.container { width: 100%; max-width: var(--container-max); margin: 0 auto; padding: 0 1.5rem; }

/* Nav */
.nav { position: fixed; top: 0; left: 0; right: 0; height: var(--nav-height); z-index: 1000; background: var(--color-nav-bg); transition: all 0.3s; }
.nav.scrolled { background: rgba(30,41,59,0.97); backdrop-filter: blur(10px); box-shadow: 0 2px 8px rgba(0,0,0,0.2); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; max-width: var(--container-max); margin: 0 auto; padding: 0 1.5rem; }
.nav-logo { height: 28px; width: auto; }
.nav-links { display: flex; align-items: center; gap: 1.75rem; }
.nav-link { font-size: 0.875rem; font-weight: 500; color: var(--color-nav-text-muted); transition: color 0.15s; }
.nav-link:hover { color: var(--color-nav-text); }

/* Buttons */
.btn-primary { padding: 0.6rem 1.5rem; background: var(--color-primary); color: #fff; border-radius: var(--radius-full); font-size: 0.875rem; font-weight: 600; transition: all 0.15s; display: inline-flex; align-items: center; gap: 0.5rem; border: none; cursor: pointer; }
.btn-primary:hover { background: var(--color-primary-dark); transform: translateY(-1px); }
.btn-secondary { padding: 0.6rem 1.5rem; background: transparent; color: var(--color-dark); border: 1.5px solid var(--color-border); border-radius: var(--radius-full); font-size: 0.875rem; font-weight: 600; transition: all 0.15s; display: inline-flex; align-items: center; gap: 0.5rem; cursor: pointer; }
.btn-secondary:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn-large { padding: 0.85rem 2rem; font-size: 1rem; }

/* Lang selector */
.lang-selector { position: relative; }
.lang-toggle { font-size: 0.8rem; font-weight: 600; color: var(--color-nav-text-muted); background: none; border: 1px solid rgba(255,255,255,0.15); border-radius: var(--radius-full); padding: 0.35rem 0.75rem; cursor: pointer; display: flex; align-items: center; gap: 0.4rem; transition: all 0.15s; }
.lang-toggle:hover { background: rgba(255,255,255,0.08); color: var(--color-nav-text); border-color: rgba(255,255,255,0.3); }
.lang-flag { width: 24px; height: 24px; border-radius: 50%; overflow: hidden; display: flex; align-items: center; justify-content: center; border: 1.5px solid rgba(255,255,255,0.2); flex-shrink: 0; }
.lang-flag svg { width: 28px; height: 28px; }
.lang-toggle-arrow { transition: transform 0.15s; }
.lang-selector.open .lang-toggle-arrow { transform: rotate(180deg); }
.lang-dropdown { position: absolute; top: calc(100% + 8px); right: 0; background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-md); box-shadow: 0 8px 24px rgba(0,0,0,0.15); min-width: 160px; opacity: 0; visibility: hidden; transform: translateY(-8px); transition: all 0.15s; z-index: 1001; }
.lang-selector.open .lang-dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.lang-option { display: flex; align-items: center; gap: 10px; padding: 10px 14px; font-size: 0.85rem; font-weight: 500; color: var(--color-body); transition: background 0.15s; }
.lang-option:first-child { border-radius: var(--radius-md) var(--radius-md) 0 0; }
.lang-option:last-child { border-radius: 0 0 var(--radius-md) var(--radius-md); }
.lang-option:hover { background: var(--color-bg-alt); }
.lang-option.active { color: var(--color-primary-dark); font-weight: 700; background: var(--color-primary-light); }
.lang-option .lang-flag { border-color: var(--color-border); }

/* Hero */
.hero { padding-top: calc(var(--nav-height) + 5rem); padding-bottom: 5rem; min-height: 100vh; display: flex; align-items: center; }
.hero-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 4rem; align-items: center; }
.hero-tag { display: inline-flex; align-items: center; gap: 0.5rem; background: var(--color-primary-light); color: var(--color-primary-dark); font-size: 0.8rem; font-weight: 700; padding: 0.4rem 1rem; border-radius: var(--radius-full); margin-bottom: 1.5rem; letter-spacing: 0.02em; }
.hero-title { font-size: 3.5rem; font-weight: 900; line-height: 1.08; color: var(--color-dark); letter-spacing: -0.03em; margin-bottom: 1.25rem; }
.hero-title span { background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-subtitle { font-size: 1.125rem; color: var(--color-muted); margin-bottom: 2rem; max-width: 480px; line-height: 1.7; }
.hero-buttons { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-img { border-radius: var(--radius-lg); box-shadow: var(--shadow-xl); border: 1px solid var(--color-border); }

/* Sections */
.section { padding: 5rem 0; }
.section-alt { background: var(--color-bg-alt); }
.section-label { display: inline-block; font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--color-primary); margin-bottom: 0.75rem; }
.section-title { font-size: 2.25rem; font-weight: 800; color: var(--color-dark); letter-spacing: -0.02em; margin-bottom: 1rem; line-height: 1.15; }
.section-title span { color: var(--color-light); }
.section-subtitle { font-size: 1.05rem; color: var(--color-muted); max-width: 600px; line-height: 1.7; }
.section-header { text-align: center; margin-bottom: 3.5rem; }
.section-header .section-subtitle { margin: 0 auto; }

/* Feature rows */
.feature-row { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; margin-bottom: 5rem; }
.feature-row:last-child { margin-bottom: 0; }
.feature-row.reverse { direction: rtl; }
.feature-row.reverse > * { direction: ltr; }
.feature-img { border-radius: var(--radius-md); box-shadow: var(--shadow-lg); border: 1px solid var(--color-border); }
.feature-caption { font-size: 0.8rem; color: var(--color-light); margin-top: 0.75rem; text-align: center; }

/* Feature cards */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.feature-card { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 2rem; transition: all 0.2s; }
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--color-primary-light); }
.feature-icon { width: 48px; height: 48px; background: var(--color-primary-light); border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin-bottom: 1rem; }
.feature-card h3 { font-size: 1.1rem; font-weight: 700; color: var(--color-dark); margin-bottom: 0.5rem; }
.feature-card p { font-size: 0.9rem; color: var(--color-muted); line-height: 1.6; }

/* Tiers */
.tiers-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.tier-card { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-xl); padding: 2.5rem 2rem; position: relative; transition: all 0.2s; }
.tier-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.tier-card.highlighted { border: 2px solid var(--color-primary); }
.tier-badge { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--color-primary); color: #fff; font-size: 0.7rem; font-weight: 700; padding: 0.3rem 1rem; border-radius: var(--radius-full); white-space: nowrap; }
.tier-name { font-size: 1.25rem; font-weight: 800; color: var(--color-dark); margin-bottom: 0.25rem; }
.tier-sub { font-size: 0.8rem; color: var(--color-light); font-weight: 600; margin-bottom: 1rem; }
.tier-desc { font-size: 0.9rem; color: var(--color-muted); margin-bottom: 1.5rem; line-height: 1.5; }
.tier-features { margin-bottom: 1.5rem; }
.tier-features li { font-size: 0.85rem; color: var(--color-body); padding: 0.35rem 0; display: flex; align-items: center; gap: 0.5rem; }
.tier-features li::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--color-primary); flex-shrink: 0; }

/* FAQ */
.faq-list { max-width: 720px; margin: 0 auto; }
.faq-item { border: 1px solid var(--color-border); border-radius: var(--radius-md); margin-bottom: 0.75rem; overflow: hidden; }
.faq-question { padding: 1.25rem 1.5rem; font-size: 1rem; font-weight: 600; color: var(--color-dark); cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq-question::-webkit-details-marker { display: none; }
.faq-question::after { content: '+'; font-size: 1.25rem; color: var(--color-light); transition: transform 0.2s; }
.faq-item[open] .faq-question::after { content: '\2212'; }
.faq-answer { padding: 0 1.5rem 1.25rem; font-size: 0.95rem; color: var(--color-muted); line-height: 1.7; }

/* CTA */
.cta-section { padding: 5rem 0; background: var(--color-nav-bg); text-align: center; }
.cta-section .section-title { color: var(--color-nav-text); }
.cta-section .section-subtitle { color: var(--color-nav-text-muted); margin: 0 auto 2rem; }

/* Footer */
.footer { padding: 2.5rem 0; background: var(--color-nav-bg); border-top: 1px solid rgba(255,255,255,0.08); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; }
.footer-text { font-size: 0.8rem; color: var(--color-nav-text-muted); }
.footer-links { display: flex; gap: 1.5rem; }
.footer-links a { font-size: 0.8rem; color: var(--color-nav-text-muted); transition: color 0.15s; }
.footer-links a:hover { color: var(--color-nav-text); }

/* Mobile menu */
.nav-hamburger { display: none; flex-direction: column; gap: 5px; padding: 0.5rem; cursor: pointer; background: none; border: none; }
.nav-hamburger span { width: 24px; height: 2px; background: var(--color-nav-text); transition: all 0.15s; }
.mobile-menu { position: fixed; top: var(--nav-height); left: 0; right: 0; background: var(--color-bg); padding: 2rem 1.5rem; display: none; flex-direction: column; gap: 1rem; box-shadow: var(--shadow-lg); z-index: 999; }
.mobile-menu.active { display: flex; }
.mobile-menu a { font-size: 1.05rem; font-weight: 500; color: var(--color-dark); padding: 0.4rem 0; }
.mobile-langs { display: flex; flex-direction: column; gap: 0.25rem; padding-top: 0.5rem; border-top: 1px solid var(--color-border); }
.mobile-langs .lang-option { display: flex; align-items: center; gap: 10px; font-size: 0.95rem; font-weight: 500; color: var(--color-muted); padding: 0.5rem 0; }
.mobile-langs .lang-option:hover { color: var(--color-dark); }
.mobile-langs .lang-option.active { color: var(--color-primary); font-weight: 700; }
.mobile-langs .lang-flag { border-color: var(--color-border); }

/* Animations */
.fade-in { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 768px) {
  .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero-title { font-size: 2.5rem; }
  .hero { min-height: auto; padding-top: calc(var(--nav-height) + 3rem); padding-bottom: 3rem; }
  .feature-row, .feature-row.reverse { grid-template-columns: 1fr; gap: 2rem; direction: ltr; }
  .features-grid { grid-template-columns: 1fr; }
  .tiers-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
  .section { padding: 3.5rem 0; }
  .section-title { font-size: 1.75rem; }
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .footer-inner { flex-direction: column; gap: 1rem; text-align: center; }
}