/* OfficeHub - Complete Stylesheet */
:root {
  --primary: #2563EB;
  --primary-dark: #1d4ed8;
  --secondary: #0F172A;
  --accent: #10B981;
  --background: #F8FAFC;
  --card: #FFFFFF;
  --text: #1E293B;
  --text-light: #64748B;
  --border: #E2E8F0;
  --danger: #EF4444;
  --warning: #F59E0B;
  --success: #10B981;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 2px 8px rgba(15,23,42,0.08);
  --shadow-lg: 0 8px 24px rgba(15,23,42,0.12);
  --transition: 0.2s ease;
  --max-w: 1100px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--background);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ========== HEADER ========== */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

.header {
  background: var(--card);
  border-bottom: 3px solid var(--primary);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header > div {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.logo {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.nav a {
  color: var(--text);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
}

.nav a:hover { background: var(--background); color: var(--primary); }
.nav a.active { color: var(--primary); font-weight: 700; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
  background: none;
  border: none;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--secondary);
  border-radius: 2px;
  transition: var(--transition);
}

.mobile-nav {
  display: none;
  flex-direction: column;
  background: var(--card);
  border-top: 1px solid var(--border);
  padding: 12px 24px;
}

.mobile-nav a {
  color: var(--text);
  text-decoration: none;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-weight: 500;
}

.mobile-nav a:last-child { border-bottom: none; }
.mobile-nav a.active { color: var(--primary); font-weight: 700; }

/* ========== HERO ========== */
.hero {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  padding: 80px 24px;
  text-align: center;
}

.hero .container { max-width: var(--max-w); margin: 0 auto; }

.hero h1 {
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.2;
}

.hero p {
  font-size: 1.15rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}

.btn-white { background: #fff; color: var(--primary); }
.btn-white:hover { background: #f1f5f9; transform: translateY(-2px); }

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); }

.btn-secondary { background: var(--primary); color: #fff; padding: 10px 20px; border-radius: var(--radius); font-size: 0.9rem; }
.btn-secondary:hover { background: var(--primary-dark); }

.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: #059669; transform: translateY(-2px); }

.btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }

.btn-sm { padding: 6px 14px; font-size: 0.85rem; }

/* ========== MAIN ========== */
main { flex: 1; }

/* ========== SECTIONS ========== */
.section { padding: 60px 24px; max-width: var(--max-w); margin: 0 auto; }
.section-title { text-align: center; margin-bottom: 40px; }
.section-title h2 { font-size: 2rem; font-weight: 800; color: var(--secondary); margin-bottom: 8px; }
.section-title p { color: var(--text-light); font-size: 1.05rem; }

/* ========== TOOLS GRID ========== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.tool-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.tool-icon { font-size: 2.5rem; margin-bottom: 16px; }
.tool-card h3 { font-size: 1.1rem; font-weight: 700; color: var(--secondary); margin-bottom: 8px; }
.tool-card p { color: var(--text-light); font-size: 0.9rem; margin-bottom: 16px; line-height: 1.5; }

/* ========== FEATURES GRID ========== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.feature-icon { font-size: 2.5rem; margin-bottom: 12px; }
.feature-card h3 { font-size: 1.05rem; font-weight: 700; color: var(--secondary); margin-bottom: 8px; }
.feature-card p { color: var(--text-light); font-size: 0.88rem; line-height: 1.5; }

/* ========== ARTICLES GRID ========== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.article-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: var(--transition);
  text-decoration: none;
  color: inherit;
  display: block;
}

.article-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }

.article-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.article-card-content { padding: 20px; }

.article-tag {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  padding: 3px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.article-card h3 { font-size: 1rem; font-weight: 700; color: var(--secondary); margin-bottom: 6px; line-height: 1.4; }
.article-card p { color: var(--text-light); font-size: 0.88rem; line-height: 1.5; }

/* ========== PAGE HEADER ========== */
.page-header {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  padding: 60px 24px;
  text-align: center;
}

.page-header h1 { font-size: 2.2rem; font-weight: 800; margin-bottom: 8px; }
.page-header p { font-size: 1.05rem; opacity: 0.9; max-width: 600px; margin: 0 auto; }

/* ========== FAQ ACCORDION ========== */
.faq-item { background: var(--card); border-radius: var(--radius); margin-bottom: 8px; border: 1px solid var(--border); }
.faq-item summary { padding: 18px 24px; cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-size: 1.3rem; color: var(--primary); font-weight: 700; }
.faq-item[open] summary::after { content: '-'; }
.faq-item .faq-answer { padding: 0 24px 18px; color: var(--text-light); line-height: 1.7; }

/* ========== FORMS ========== */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-family: inherit;
  transition: var(--transition);
  background: var(--card);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* ========== FOOTER ========== */
.footer {
  background: var(--secondary);
  color: #fff;
  margin-top: auto;
}

.footer-content {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 48px 24px 24px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 32px;
}

.footer-section h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 12px; }
.footer-section ul { list-style: none; }
.footer-section li { margin-bottom: 8px; }
.footer-section a { color: rgba(255,255,255,0.7); text-decoration: none; font-size: 0.9rem; transition: var(--transition); }
.footer-section a:hover { color: #fff; }

.footer-bottom {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 16px 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
  text-align: center;
  font-size: 0.85rem;
  opacity: 0.6;
}

/* ========== TOOL PAGE ========== */
.tool-page { max-width: 800px; margin: 0 auto; padding: 40px 24px; }
.tool-page h1 { font-size: 1.8rem; font-weight: 800; color: var(--secondary); margin-bottom: 8px; }
.tool-page .subtitle { color: var(--text-light); margin-bottom: 32px; font-size: 1.05rem; }
.tool-card-form { background: var(--card); border-radius: var(--radius-lg); padding: 32px; box-shadow: var(--shadow); border: 1px solid var(--border); margin-bottom: 24px; }

.result-box {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 2px solid var(--primary);
  display: none;
}

.info-box { background: #EFF6FF; border: 1px solid #BFDBFE; border-radius: var(--radius); padding: 16px; margin-top: 16px; font-size: 0.9rem; color: #1E40AF; }
.info-box h4 { font-weight: 700; margin-bottom: 6px; }

/* ========== BADGES ========== */
.badge { display: inline-block; padding: 2px 10px; border-radius: 20px; font-size: 0.75rem; font-weight: 600; }
.badge-primary { background: var(--primary); color: #fff; }
.badge-secondary { background: var(--secondary); color: #fff; }
.badge-accent { background: var(--accent); color: #fff; }
.badge-high { background: #FEE2E2; color: #991B1B; }
.badge-medium { background: #FEF3C7; color: #92400E; }
.badge-low { background: #D1FAE5; color: #065F46; }

/* ========== RESULT DISPLAY ========== */
.result-card { background: var(--card); border-radius: var(--radius); padding: 20px; margin-bottom: 16px; border: 1px solid var(--border); }
.result-card h3 { font-size: 1rem; font-weight: 700; color: var(--secondary); margin-bottom: 8px; }
.result-value { font-size: 2rem; font-weight: 800; color: var(--primary); }
.result-label { color: var(--text-light); font-size: 0.85rem; }

/* ========== TABLES ========== */
table { width: 100%; border-collapse: collapse; background: var(--card); border-radius: var(--radius); overflow: hidden; }
th { background: var(--primary); color: #fff; padding: 12px 16px; text-align: left; font-weight: 600; }
td { padding: 12px 16px; border-bottom: 1px solid var(--border); }
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--background); }

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
  .nav { display: none; }
  .hamburger { display: flex; }
  .mobile-nav.active { display: flex; }
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }
  .section { padding: 40px 16px; }
  .section-title h2 { font-size: 1.6rem; }
  .tools-grid { grid-template-columns: 1fr; }
  .articles-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr 1fr; }
  .footer-content { grid-template-columns: 1fr 1fr; }
  .page-header h1 { font-size: 1.8rem; }
}

@media (max-width: 480px) {
  .hero { padding: 50px 16px; }
  .hero h1 { font-size: 1.6rem; }
  .features-grid { grid-template-columns: 1fr; }
  .footer-content { grid-template-columns: 1fr; }
  .tool-page { padding: 24px 16px; }
  .tool-card-form { padding: 20px; }
}

/* ========== ANIMATIONS ========== */
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.fade-in { animation: fadeIn 0.4s ease forwards; }

/* ========== UTILITY ========== */
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.text-muted { color: var(--text-light); }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }