/* Global Picture Wall Styles */
:root {
  --primary-color: #4285f4;
  --primary-dark: #3367d6;
  --accent-color: #ea4335;
  --bg-color: #f8f9fa;
  --card-bg: #ffffff;
  --text-color: #202124;
  --text-muted: #5f6368;
  --border-color: #dadce0;
  --radius: 8px;
  --shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.5;
}

/* Header & Nav */
header.navbar {
  background-color: #ffffff;
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.nav-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-color);
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--primary-color);
}

.nav-auth {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-color);
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border-color);
}

/* Container */
.container {
  max-width: 1100px;
  margin: 2rem auto;
  padding: 0 1rem;
}

/* Cards & Layout */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
}

.card h2 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--text-color);
}

/* Form Styles */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.form-control {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
}

.form-control:focus {
  border-color: var(--primary-color);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.6rem 1.25rem;
  border: none;
  border-radius: 4px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  transition: background-color 0.2s, opacity 0.2s;
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
}

.btn-secondary {
  background-color: #f1f3f4;
  color: var(--text-color);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: #e8eaed;
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.85rem;
}

/* Alerts & Notices */
.alert {
  padding: 1rem;
  border-radius: 4px;
  margin-bottom: 1rem;
}

.alert-danger {
  background-color: #fce8e6;
  color: #c5221f;
  border: 1px solid #f5c2c7;
}

.alert-info {
  background-color: #e8f0fe;
  color: #1a73e8;
  border: 1px solid #d2e3fc;
}

.alert-success {
  background-color: #e6f4ea;
  color: #137333;
  border: 1px solid #ceead6;
}

/* Modal / Login overlay */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}

.modal-content {
  background: white;
  padding: 2rem;
  border-radius: var(--radius);
  max-width: 420px;
  width: 90%;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

/* Responsive grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}