/* ============================================================
   AgriSense AI · Lean Design System (shared across sub-pages)
   ============================================================ */
:root {
  --green: #0F8A3E;
  --green-dark: #047857;
  --gold: #B8860B;
  --ink: #0F172A;
  --ink-mute: #475569;
  --bg: #FFFFFF;
  --bg-soft: #FAFBFC;
  --bg-cream: #FFFDF7;
  --border: #E2E8F0;
  --shadow-sm: 0 1px 2px rgba(15,23,42,.06);
  --shadow-md: 0 8px 24px -8px rgba(15,23,42,.12);
  --shadow-lg: 0 20px 50px -12px rgba(15,23,42,.18);
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 24px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; color: var(--ink); background: var(--bg); line-height: 1.55; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; display: block; }

:focus-visible { outline: 3px solid var(--green); outline-offset: 3px; border-radius: 6px; }
.skip-link { position: absolute; top: -200px; left: 8px; background: var(--green); color: #fff; padding: 10px 16px; border-radius: 8px; z-index: 10000; font-weight: 700; text-decoration: none; }
.skip-link:focus { top: 8px; }

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

/* Header */
.site-header { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,.92); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.nav { display: flex; align-items: center; gap: 24px; padding: 14px 24px; max-width: 1280px; margin: 0 auto; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); flex-shrink: 0; }
.brand-mark { width: 36px; height: 36px; background: linear-gradient(135deg, var(--green) 0%, var(--green-dark) 100%); color: #fff; border-radius: 10px; display: grid; place-items: center; font-weight: 800; font-size: 18px; box-shadow: var(--shadow-sm); }
.brand-name { font-weight: 800; font-size: 18px; letter-spacing: -.01em; }
.menu { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.menu a, .menu button { font-family: inherit; font-size: 14.5px; font-weight: 500; color: var(--ink); text-decoration: none; padding: 8px 14px; border-radius: 8px; border: 0; background: transparent; cursor: pointer; transition: background .15s, color .15s; display: inline-flex; align-items: center; gap: 4px; }
.menu a:hover, .menu button:hover { background: rgba(15,138,62,.08); color: var(--green-dark); }
.menu .dropdown { position: relative; }
.menu .dropdown > button::after { content: '▾'; font-size: 10px; margin-left: 2px; opacity: .7; }
.menu .dropdown-panel { position: absolute; top: calc(100% + 4px); left: 0; min-width: 220px; background: #fff; border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow-lg); padding: 6px; opacity: 0; visibility: hidden; transform: translateY(-4px); transition: opacity .15s, transform .15s, visibility .15s; }
.menu .dropdown:hover .dropdown-panel, .menu .dropdown:focus-within .dropdown-panel { opacity: 1; visibility: visible; transform: translateY(0); }
.menu .dropdown-panel a { display: block; padding: 10px 14px; border-radius: 8px; font-size: 14px; }
.lang-toggle { display: inline-flex; align-items: center; gap: 4px; padding: 6px 12px; border: 1px solid var(--border); border-radius: 8px; background: #fff; font-size: 13px; font-weight: 600; color: var(--ink); cursor: pointer; }
.lang-toggle::before { content: '🌐'; font-size: 14px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 18px; font-family: inherit; font-size: 14.5px; font-weight: 600; border: 0; border-radius: 10px; text-decoration: none; cursor: pointer; transition: transform .12s, box-shadow .15s, background .15s; line-height: 1; }
.btn-primary { background: linear-gradient(135deg, var(--green) 0%, var(--green-dark) 100%); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-ghost { background: transparent; color: var(--ink); border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--bg-soft); }
.btn-lg { padding: 14px 28px; font-size: 16px; border-radius: 12px; }
.mobile-toggle { display: none; background: transparent; border: 1px solid var(--border); padding: 8px; border-radius: 8px; cursor: pointer; }
.mobile-menu { display: none; padding: 12px 24px 18px; background: #fff; border-bottom: 1px solid var(--border); }
.mobile-menu.open { display: block; }
.mobile-menu a { display: block; padding: 10px 12px; color: var(--ink); text-decoration: none; font-size: 15px; border-radius: 8px; }
.mobile-menu a:hover { background: var(--bg-soft); }

/* Page hero (sub-pages) */
.page-hero { padding: clamp(48px, 7vw, 80px) 0 clamp(32px, 4vw, 48px); background: linear-gradient(180deg, var(--bg-cream) 0%, var(--bg) 100%); text-align: center; }
.page-hero .eyebrow { display: inline-block; font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .12em; color: var(--green); margin-bottom: 12px; }
.page-hero h1 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; line-height: 1.1; letter-spacing: -.025em; margin: 0 auto 18px; max-width: 800px; }
.page-hero h1 .grad { background: linear-gradient(135deg, var(--green) 0%, var(--green-dark) 60%, var(--gold) 100%); -webkit-background-clip: text; background-clip: text; color: transparent; }
.page-hero .lead { font-size: 1.1rem; color: var(--ink-mute); max-width: 680px; margin: 0 auto; }

.section { padding: clamp(48px, 6vw, 80px) 0; }
.section-soft { background: var(--bg-soft); }

/* Problems page · filters + grid */
.filters { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-bottom: 36px; }
.chip { padding: 8px 16px; border: 1px solid var(--border); background: #fff; border-radius: 999px; font-size: 13.5px; font-weight: 600; color: var(--ink-mute); cursor: pointer; transition: all .15s; }
.chip:hover { border-color: var(--green); color: var(--green); }
.chip.active { background: var(--green); color: #fff; border-color: var(--green); }

.problems-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.problem-card { background: #fff; border: 1px solid var(--border); border-radius: var(--r-lg); padding: 24px; display: flex; flex-direction: column; transition: transform .2s, box-shadow .2s, border-color .2s; }
.problem-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: rgba(15,138,62,.3); }
.problem-card .num { display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 32px; background: rgba(184,134,11,.12); color: var(--gold); border-radius: 8px; font-weight: 800; font-size: 14px; margin-bottom: 12px; }
.problem-card h3 { font-size: 1.05rem; font-weight: 700; margin: 0 0 10px; color: var(--ink); line-height: 1.3; }
.problem-card .prob { font-size: 13.5px; color: var(--ink-mute); margin: 0 0 12px; line-height: 1.5; }
.problem-card .sol { font-size: 13.5px; color: var(--green-dark); margin: 0 0 12px; line-height: 1.5; font-weight: 500; background: rgba(15,138,62,.06); padding: 10px 12px; border-radius: 8px; }
.problem-card .link { color: var(--green-dark); font-weight: 600; font-size: 13px; text-decoration: none; margin-top: auto; }

/* About page */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.about-card { background: var(--bg-cream); padding: 32px; border-radius: var(--r-xl); border: 1px solid rgba(184,134,11,.18); }
.founder-portrait { width: 96px; height: 96px; background: linear-gradient(135deg, #FFD56B 0%, var(--gold) 100%); color: #fff; border-radius: 50%; display: grid; place-items: center; font-size: 28px; font-weight: 800; margin: 0 auto 20px; box-shadow: var(--shadow-md); }
.mission-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 48px; }
.mission-card { padding: 28px; background: #fff; border: 1px solid var(--border); border-radius: var(--r-lg); text-align: center; }
.mission-card .icon { font-size: 32px; margin-bottom: 12px; }

/* Blog page */
.blog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.blog-card { background: #fff; border: 1px solid var(--border); border-radius: var(--r-lg); overflow: hidden; text-decoration: none; color: inherit; transition: transform .2s, box-shadow .2s; display: flex; flex-direction: column; }
.blog-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.blog-card-img { background: linear-gradient(135deg, var(--bg-cream) 0%, #FFF1C6 100%); aspect-ratio: 16/9; display: grid; place-items: center; font-size: 56px; }
.blog-card-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.blog-card .tag { display: inline-block; background: rgba(15,138,62,.08); color: var(--green-dark); font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; padding: 4px 10px; border-radius: 999px; margin-bottom: 10px; align-self: flex-start; }
.blog-card h3 { font-size: 1.1rem; font-weight: 700; margin: 0 0 8px; line-height: 1.3; }
.blog-card p { font-size: 14px; color: var(--ink-mute); margin: 0 0 14px; line-height: 1.55; flex: 1; }
.blog-card .meta { font-size: 13px; color: var(--ink-mute); }

/* Contact page */
.contact-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 48px; align-items: start; }
.contact-form { background: #fff; padding: 32px; border-radius: var(--r-xl); border: 1px solid var(--border); box-shadow: var(--shadow-sm); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.form-group label { font-size: 13.5px; font-weight: 600; color: var(--ink); }
.form-group input, .form-group select, .form-group textarea { padding: 12px 14px; border: 1px solid var(--border); border-radius: 10px; font-family: inherit; font-size: 14.5px; color: var(--ink); background: #fff; transition: border .15s, box-shadow .15s; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: 0; border-color: var(--green); box-shadow: 0 0 0 3px rgba(15,138,62,.12); }
.form-group textarea { min-height: 120px; resize: vertical; }
.contact-info { padding: 28px; background: linear-gradient(135deg, var(--green-dark) 0%, var(--green) 100%); color: #fff; border-radius: var(--r-xl); }
.contact-info h3 { color: #fff; margin: 0 0 16px; font-size: 1.2rem; }
.contact-info p { color: rgba(255,255,255,.88); margin: 0 0 14px; font-size: 14px; line-height: 1.55; }
.contact-info a { color: #fff; text-decoration: underline; }
.contact-info-row { display: flex; align-items: center; gap: 12px; padding: 12px 0; border-top: 1px solid rgba(255,255,255,.16); }
.contact-info-row:first-of-type { border-top: 0; padding-top: 0; }
.contact-info-row .icon { font-size: 20px; }

/* Footer */
.site-footer { background: #0B1220; color: rgba(255,255,255,.75); padding: 56px 0 24px; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .brand-name { color: #fff; }
.footer-brand p { margin: 12px 0 16px; color: rgba(255,255,255,.55); font-size: 13.5px; line-height: 1.6; }
.footer-col h5 { color: #fff; font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: .1em; margin: 0 0 16px; }
.footer-col a { display: block; color: rgba(255,255,255,.65); text-decoration: none; padding: 5px 0; font-size: 14px; transition: color .15s; }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 13px; color: rgba(255,255,255,.5); }

/* Responsive */
@media (max-width: 1024px) {
  .problems-grid, .blog-grid { grid-template-columns: repeat(2, 1fr); }
  .mission-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 768px) {
  .menu, .nav .btn { display: none; }
  .mobile-toggle { display: block; }
  .problems-grid, .blog-grid, .mission-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; } }