:root {
  /* Color Palette - Medical & Trustworthy but Soothing */
  --blood-red: #d32f2f;
  --blood-red-soft: #ff8a80;
  --teal-primary: #00796b;
  --teal-light: #e0f2f1;
  --slate-900: #1a202c;
  --slate-800: #2d3748;
  --slate-100: #f7fafc;
  --white: #ffffff;
  --border-color: #e2e8f0;
  
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 48px;
  --space-2xl: 80px;
  
  /* Typography */
  --font-display: 'Cairo', sans-serif;
  --font-body: 'Cairo', sans-serif;
}

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

body {
  font-family: var(--font-body);
  background-color: var(--white);
  direction: rtl;
  text-align: right;
  color: var(--slate-800);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3 {
  font-family: var(--font-display);
  color: var(--slate-900);
  line-height: 1.2;
}

a {
  text-decoration: none;
  color: inherit;
  transition: all 0.2s ease;
}

/* Layout Components */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 4rem);
}

section {
  margin-top: var(--space-2xl);
}

main > :first-child {
  margin-top: 0;
}

/* Navigation */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--blood-red);
  border-radius: 50% 50% 50% 0;
  transform: rotate(-45deg);
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
}

.nav-link:hover {
  color: var(--teal-primary);
}

.btn {
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  transition: transform 0.2s ease, background 0.2s ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--teal-primary);
  color: var(--white);
}

.btn-primary:hover {
  background: #004d40;
}

.btn-outline {
  border: 2px solid var(--teal-primary);
  color: var(--teal-primary);
}

/* Hero Section */
.hero {
  padding: var(--space-2xl) 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.hero-content h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin-bottom: var(--space-lg);
}

.hero-content p {
  font-size: 1.2rem;
  margin-bottom: var(--space-xl);
  color: var(--slate-800);
  max-width: 90%;
}

.hero-visual {
  position: relative;
}

.hero-shape {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 120%;
  height: 120%;
  background: radial-gradient(circle, var(--teal-light) 0%, transparent 70%);
  z-index: -1;
}

/* Feature Cards */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.card {
  padding: var(--space-xl);
  border-radius: 24px;
  background: var(--slate-100);
  border: 1px solid var(--border-color);
  transition: transform 0.3s ease;
}

.card:hover {
  transform: translateY(-8px);
  background: var(--white);
  box-shadow: 0 20px 40px rgba(0,0,0,0.05);
}

.card-icon {
  width: 48px;
  height: 48px;
  background: var(--teal-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
  color: var(--teal-primary);
}

/* Dashboard Specifics */
.dashboard-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}

[direction="rtl"] .dashboard-layout {
  grid-template-columns: 1fr 280px;
}

.sidebar {
  background: var(--slate-900);
  color: var(--white);
  padding: var(--space-xl) var(--space-lg);
}

.sidebar-nav {
  margin-top: var(--space-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.sidebar-link {
  padding: var(--space-md);
  border-radius: 12px;
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.sidebar-link.active {
  background: var(--teal-primary);
}

.main-content {
  padding: var(--space-xl);
  background: var(--slate-100);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.stat-card {
  background: var(--white);
  padding: var(--space-lg);
  border-radius: 16px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.02);
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  margin: var(--space-sm) 0;
}

.stat-label {
  color: #64748b;
  font-size: 0.9rem;
}

.placeholder-image {
  width: 100%;
  aspect-ratio: 16/9;
  background: #e2e8f0;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #94a3b8;
  font-weight: 500;
  position: relative;
  overflow: hidden;
}

.placeholder-image::after {
  content: attr(data-label);
}

.placeholder-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #cbd5e1;
}

/* Footer */
footer {
  margin-top: var(--space-2xl);
  padding: var(--space-2xl) 0 var(--space-xl);
  background: var(--slate-900);
  color: var(--white);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-xl);
}

/* Blood Level Indicator */
.blood-meter {
  height: 200px;
  width: 40px;
  background: #eee;
  border-radius: 20px;
  position: relative;
  overflow: hidden;
  margin: 0 auto;
}

.blood-fill {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  background: linear-gradient(to top, var(--blood-red), var(--blood-red-soft));
  transition: height 1s ease-out;
}

@media (max-width: 768px) {
  .hero { grid-template-columns: 1fr; }
  .dashboard-layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}