:root {
  --bg-main: #F8FAFC;
  --bg-sec: #EDF7F6;
  --header-footer: #D1FAE5; /* Light green */
  --primary: #0891B2;
  --secondary: #14B8A6;
  --accent: #F97316;
  --card-bg: #FFFFFF;
  --border: #A7F3D0; /* Green */
  --border-hover: #10B981; /* Darker green */
  --highlight: #ECFEFF;
  --sec-highlight: #F0FDFA;
  --text-main: #1E293B;
  --text-sec: #64748B;
  --text-muted: #94A3B8;
  --success: #16A34A;
  --warning: #D97706;
  --btn-primary: #0891B2;
  --btn-primary-hover: #0E7490;
  --btn-sec: #FFFFFF;
  --btn-border: #A7F3D0; /* Green */
  --btn-border-hover: #10B981; /* Darker green */
  --radius-card: 20px;
  --radius-btn: 8px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
  --transition: all 0.3s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 100%; }
body { font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; background-color: var(--bg-main); color: var(--text-main); line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--secondary); }
ul { list-style: none; }
img { max-width: 100%; height: auto; display: block; border-radius: 8px; }

/* Accessibility Focus */
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.skip-link { position: absolute; top: -40px; left: 0; background: var(--accent); color: white; padding: 8px; z-index: 1000; transition: top 0.2s; }
.skip-link:focus { top: 0; }

/* Typography */
h1, h2, h3, h4, h5, h6 { color: var(--text-main); font-weight: 700; line-height: 1.2; margin-bottom: 1rem; }
h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
p { margin-bottom: 1rem; color: var(--text-sec); }
.text-muted { color: var(--text-muted); }

/* Layout & Grid */
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
.section { padding: 5rem 0; }
.section-light { background-color: var(--card-bg); }
.section-sec { background-color: var(--bg-sec); }
.grid { display: grid; gap: 2rem; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

/* Header & Nav */
.site-header { background-color: var(--header-footer); color: var(--text-main); position: sticky; top: 0; z-index: 50; transition: var(--transition); }
.site-header.scrolled { box-shadow: var(--shadow-md); background-color: rgba(209, 250, 229, 0.95); backdrop-filter: blur(10px); }
.nav-container { display: flex; justify-content: space-between; align-items: center; height: 80px; }
.logo { font-size: 1.5rem; font-weight: 700; color: var(--text-main); display: flex; align-items: center; gap: 0.5rem; }
.logo:hover { color: var(--secondary); }
.main-nav ul { display: flex; gap: 1.5rem; align-items: center; }
.main-nav a { color: var(--text-sec); font-weight: 500; font-size: 0.95rem; }
.main-nav a:hover, .main-nav a.active { color: var(--secondary); }
.mobile-menu-btn { display: none; background: none; border: none; color: var(--text-main); font-size: 1.5rem; cursor: pointer; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 0.75rem 1.5rem; border-radius: var(--radius-btn); font-weight: 600; cursor: pointer; transition: var(--transition); border: 2px solid transparent; text-align: center; }
.btn-primary { background-color: var(--btn-primary); color: white; }
.btn-primary:hover { background-color: var(--btn-primary-hover); color: white; transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-secondary { background-color: var(--btn-sec); color: var(--text-main); border-color: var(--btn-border); }
.btn-secondary:hover { border-color: var(--btn-border-hover); color: var(--primary); transform: translateY(-2px); }
.btn-accent { background-color: var(--accent); color: white; }
.btn-accent:hover { background-color: #EA580C; color: white; }

/* Hero Section */
.hero { background: linear-gradient(135deg, var(--bg-sec) 0%, var(--highlight) 100%); padding: 6rem 0; overflow: hidden; position: relative; }
.hero-content { max-width: 800px; text-align: center; margin: 0 auto; position: relative; z-index: 2; }
.hero h1 { font-size: 3rem; margin-bottom: 1.5rem; color: var(--text-main); }
.hero p { font-size: 1.25rem; margin-bottom: 2rem; color: var(--text-sec); }
.hero-cta { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* Glassmorphism Elements */
.glass-panel { background: rgba(255, 255, 255, 0.7); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border: 1px solid rgba(255, 255, 255, 0.5); border-radius: var(--radius-card); padding: 2rem; box-shadow: var(--shadow-lg); }

/* Premium Cards */
.card { background-color: var(--card-bg); border-radius: var(--radius-card); padding: 2rem; box-shadow: var(--shadow-sm); border: 1px solid var(--border); transition: var(--transition); display: flex; flex-direction: column; height: 100%; position: relative; overflow: hidden; }
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: var(--border-hover); }
.card-icon { width: 50px; height: 50px; background-color: var(--sec-highlight); color: var(--primary); border-radius: 12px; display: flex; align-items: center; justify-content: center; margin-bottom: 1.5rem; font-size: 1.5rem; }
.card-title { font-size: 1.25rem; margin-bottom: 1rem; color: var(--text-main); }
.card-body { flex: 1; }
.card-footer { margin-top: 1.5rem; padding-top: 1.5rem; border-top: 1px solid var(--border); }

/* Badges */
.badge { display: inline-block; padding: 0.25rem 0.75rem; border-radius: 999px; font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; }
.badge-primary { background-color: var(--highlight); color: var(--primary); }
.badge-success { background-color: #DCFCE7; color: var(--success); }
.badge-warning { background-color: #FEF3C7; color: var(--warning); }

/* Notices / Alerts */
.notice { padding: 1.5rem; border-radius: 12px; margin-bottom: 2rem; display: flex; gap: 1rem; align-items: flex-start; }
.notice-editor { background-color: var(--highlight); border-left: 4px solid var(--primary); }
.notice-ethics { background-color: #FEF3C7; border-left: 4px solid var(--warning); }
.notice-icon { font-size: 1.5rem; flex-shrink: 0; }

/* Comparison Table */
.table-responsive { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 2rem 0; border-radius: 12px; box-shadow: var(--shadow-sm); border: 1px solid var(--border); background: var(--card-bg); }
.comparison-table { width: 100%; border-collapse: collapse; text-align: left; min-width: 800px; }
.comparison-table th, .comparison-table td { padding: 1rem 1.5rem; border-bottom: 1px solid var(--border); }
.comparison-table th { background-color: var(--bg-sec); font-weight: 600; color: var(--text-main); position: sticky; top: 0; }
.comparison-table tr:last-child td { border-bottom: none; }
.comparison-table tr:hover td { background-color: var(--sec-highlight); }
.check-icon { color: var(--success); font-weight: bold; }
.cross-icon { color: var(--text-muted); }

/* FAQ Accordion */
.faq-item { border: 1px solid var(--border); border-radius: 12px; margin-bottom: 1rem; background: var(--card-bg); overflow: hidden; }
.faq-question { width: 100%; text-align: left; padding: 1.5rem; background: none; border: none; font-size: 1.1rem; font-weight: 600; color: var(--text-main); cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.faq-answer { padding: 0 1.5rem; max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-item.active .faq-answer { padding: 0 1.5rem 1.5rem; max-height: 500px; }
.faq-icon { transition: transform 0.3s ease; }
.faq-item.active .faq-icon { transform: rotate(180deg); }

/* Forms */
.form-group { margin-bottom: 1.5rem; }
.form-label { display: block; margin-bottom: 0.5rem; font-weight: 500; color: var(--text-main); }
.form-control { width: 100%; padding: 0.75rem 1rem; border: 1px solid var(--btn-border); border-radius: var(--radius-btn); font-family: inherit; font-size: 1rem; transition: var(--transition); background-color: var(--card-bg); }
.form-control:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--highlight); }
textarea.form-control { resize: vertical; min-height: 120px; }
.form-message { display: none; padding: 1rem; border-radius: var(--radius-btn); margin-bottom: 1rem; }
.form-message.success { display: block; background-color: #DCFCE7; color: var(--success); border: 1px solid #bbf7d0; }

/* Cookie Banner */
.cookie-banner { position: fixed; bottom: -100%; left: 0; width: 100%; background-color: var(--card-bg); box-shadow: 0 -4px 20px rgba(0,0,0,0.1); z-index: 9999; transition: bottom 0.5s cubic-bezier(0.4, 0, 0.2, 1); padding: 1.5rem 0; border-top: 1px solid var(--border); }
.cookie-banner.show { bottom: 0; }
.cookie-content { display: flex; flex-direction: column; gap: 1rem; }
@media (min-width: 768px) {
  .cookie-content { flex-direction: row; justify-content: space-between; align-items: center; }
}
.cookie-text { max-width: 800px; font-size: 0.9rem; }
.cookie-buttons { display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* Footer */
.site-footer { background-color: var(--header-footer); color: var(--text-sec); padding: 4rem 0 2rem; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 2rem; margin-bottom: 3rem; }
.footer-heading { color: var(--text-main); font-size: 1.2rem; margin-bottom: 1.5rem; }
.footer-links li { margin-bottom: 0.75rem; }
.footer-links a { color: var(--text-sec); }
.footer-links a:hover { color: var(--primary); }
.footer-bottom { border-top: 1px solid var(--border); padding-top: 2rem; text-align: center; font-size: 0.9rem; display: flex; flex-direction: column; gap: 1rem; }
@media (min-width: 768px) {
  .footer-bottom { flex-direction: row; justify-content: space-between; text-align: left; }
}

/* Animations */
@keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.animate-fade-in { animation: fadeIn 0.6s ease forwards; }

/* Content Formatting */
.content-area h2 { margin-top: 2.5rem; margin-bottom: 1rem; }
.content-area h3 { margin-top: 1.5rem; margin-bottom: 0.75rem; }
.content-area ul { list-style-type: disc; padding-left: 1.5rem; margin-bottom: 1rem; }
.content-area li { margin-bottom: 0.5rem; color: var(--text-sec); }

/* Responsive */
@media (max-width: 768px) {
  .mobile-menu-btn { display: block; }
  .main-nav { position: fixed; top: 80px; left: -100%; width: 100%; height: calc(100vh - 80px); background-color: var(--header-footer); transition: left 0.3s ease; padding: 2rem; overflow-y: auto; }
  .main-nav.active { left: 0; }
  .main-nav ul { flex-direction: column; align-items: flex-start; gap: 2rem; }
  .main-nav a { font-size: 1.2rem; }
  .hero h1 { font-size: 2rem; }
  .section { padding: 3rem 0; }
}

/* Print View */
@media print {
  .site-header, .site-footer, .hero, .cookie-banner, .btn { display: none !important; }
  body { background: white; color: black; }
  .container { max-width: 100%; padding: 0; }
  .card, .glass-panel { box-shadow: none; border: 1px solid #ccc; break-inside: avoid; }
}