/* ==========================================================================
   Wortschatz B1 - Main Stylesheet (Modern, Eye-Friendly Design System)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Tajawal:wght@400;500;700;800&family=Inter:wght@400;500;600;700&display=swap');

:root {
  /* Core Light Palette */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-elevated: #ffffff;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;

  --border-color: #e2e8f0;
  --border-focus: #3b82f6;

  /* Brand Accents */
  --brand-primary: #1e3a5f;
  --brand-secondary: #2563eb;
  --brand-gradient: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%);
  --brand-surface: rgba(37, 99, 235, 0.08);

  /* Semantic Feedback */
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.12);
  --success-border: #10b981;
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.12);
  --danger-border: #ef4444;
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.12);
  --info: #06b6d4;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

  /* Radii & Transitions */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);

  /* Typography */
  --font-arabic: 'Tajawal', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-german: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* Base Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-arabic);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Directionality Classes */
.rtl-text {
  direction: rtl;
  text-align: right;
  font-family: var(--font-arabic);
}

.ltr-text {
  direction: ltr;
  text-align: left;
  font-family: var(--font-german);
}

/* Layout Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Hidden Utility */
.hidden {
  display: none !important;
}

/* App Header & Navbar */
.app-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 800;
  font-size: 1.25rem;
  cursor: pointer;
}

.brand-logo .logo-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--brand-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-size: 1.2rem;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.brand-logo .logo-text span {
  color: var(--brand-secondary);
  font-size: 0.9em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Action Icons */
.icon-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  transition: var(--transition);
  font-size: 1.1rem;
}

.icon-btn:hover {
  background: var(--brand-surface);
  color: var(--brand-secondary);
  border-color: var(--brand-secondary);
}

.icon-btn .badge-count {
  position: absolute;
  top: -4px;
  right: -4px;
  background: var(--danger);
  color: white;
  font-size: 0.7rem;
  font-weight: 700;
  height: 18px;
  min-width: 18px;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
  border: 2px solid var(--bg-secondary);
}

/* Streak Badge */
.streak-pill {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: #b45309;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
}

/* Search Bar in Header */
.search-wrapper {
  position: relative;
  width: 240px;
}

.search-input {
  width: 100%;
  padding: 0.5rem 1rem 0.5rem 2.2rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  transition: var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--brand-secondary);
  background: var(--bg-secondary);
  box-shadow: 0 0 0 3px var(--brand-surface);
}

.search-icon {
  position: absolute;
  left: 0.8rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  font-size: 0.9rem;
}