:root {
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text-main: #1e293b;
  --text-sub: #64748b;
  --danger: #ef4444;
  --border: #e2e8f0;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
  background-color: var(--bg);
  color: var(--text-main);
  padding: 20px;
  min-height: 100vh;
}

/* --- Layout Container: Mobile First --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column; /* Stacks sections on mobile */
  gap: 25px;
}

/* --- Desktop Layout: Two Columns --- */
@media (min-width: 850px) {
  .container {
    flex-direction: row; /* Side-by-side on desktop */
    align-items: flex-start;
  }

  /* Left Column (Form) */
  #appSection > .section:first-child {
    flex: 1; 
    position: sticky;
    top: 20px;
  }

  /* Right Column (Directory) */
  #appSection > .section:last-child {
    flex: 1.6;
  }
}

/* --- Section Styling --- */
.section {
  background: var(--card-bg);
  padding: 25px;
  border-radius: 24px;
  border: 1px solid var(--border);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  width: 100%;
}

h2 {
  color: var(--primary);
  margin-bottom: 20px;
  font-size: 1.5rem;
  font-weight: 800;
}

/* --- Form Elements --- */
.input-group {
  margin-bottom: 15px;
}

label {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 6px;
  color: var(--text-sub);
}

input {
  width: 100%;
  padding: 12px;
  border: 2px solid var(--border);
  border-radius: 12px;
  font-size: 1rem;
  transition: border-color 0.2s;
}

input:focus {
  outline: none;
  border-color: var(--primary);
}

button#addContactBtn {
  width: 100%;
  padding: 14px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 12px;
  font-weight: 700;
  cursor: pointer;
}

/* --- The Auto-Aligning Contact Card --- */
.contact-card {
  background: #fff;
  padding: 20px;
  margin-bottom: 15px;
  border-radius: 16px;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column; /* Stack name and buttons on mobile */
  gap: 15px;
}

/* Align buttons to the right only on larger mobile/desktop */
@media (min-width: 500px) {
  .contact-card {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.contact-info h3 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.contact-info p {
  font-size: 0.9rem;
  color: var(--text-sub);
}

/* --- Action Buttons (Edit/Delete) --- */
.actions {
  display: flex;
  gap: 10px;
}

.icon-btn {
  padding: 8px 16px;
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: transform 0.1s;
  text-align: center;
  min-width: 80px;
}

.edit-btn {
  background: #eef2ff;
  color: var(--primary);
}

.del-btn {
  background: #fee2e2;
  color: var(--danger);
}

.icon-btn:active {
  transform: scale(0.95);
}

/* --- Search Bar --- */
.search-box {
  background: #f1f5f9;
  border: none;
  margin-bottom: 20px;
}