:root {
  --color-bg: #f8f9fa;
  --color-card: #ffffff;
  --color-primary: #4a90e2;
  --color-primary-hover: #357abd;
  --color-danger: #e74c3c;
  --color-text: #333333;
  --color-muted: #6c757d;
  --color-border: #dee2e6;
  --color-active: #e8f4fd;
  --color-active-border: #4a90e2;
  --radius: 8px;
  --shadow: 0 2px 4px rgba(0,0,0,0.1);
}

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

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

/* Header */
.header {
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 10;
}

.header h1 {
  font-size: 1.25rem;
  font-weight: 600;
}

/* Buttons */
button {
  min-height: 44px;
  padding: 0 16px;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: background 0.15s;
}

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

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

.btn-danger {
  background: var(--color-danger);
  color: white;
  min-height: 36px;
  padding: 0 12px;
  font-size: 0.8rem;
}

.btn-ghost {
  background: transparent;
  color: var(--color-muted);
  border: 1px solid var(--color-border);
}

.btn-ghost:hover {
  background: var(--color-bg);
}

/* Login */
.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 16px;
}

.login-card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
  width: 100%;
  max-width: 400px;
}

.login-card h2 {
  margin-bottom: 24px;
  font-size: 1.5rem;
}

/* Forms */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-muted);
}

input[type="text"],
input[type="password"],
textarea {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s;
}

input:focus,
textarea:focus {
  border-color: var(--color-primary);
}

textarea {
  min-height: 80px;
  resize: vertical;
}

/* Main layout */
.main {
  max-width: 700px;
  margin: 0 auto;
  padding: 16px;
}

/* Add meal form */
.add-meal-card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 20px;
}

.add-meal-card h3 {
  margin-bottom: 16px;
  font-size: 1rem;
}

/* Meal card */
.meal-card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 16px;
}

.meal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 8px;
}

.meal-title {
  font-size: 1.1rem;
  font-weight: 600;
}

.meal-meta {
  font-size: 0.8rem;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.meal-description {
  color: var(--color-text);
  margin-bottom: 16px;
  font-size: 0.9rem;
}

/* Reactions */
.reactions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.reaction-btn {
  min-height: 44px;
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: 22px;
  background: transparent;
  cursor: pointer;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s;
}

.reaction-btn:hover {
  background: var(--color-bg);
}

.reaction-btn.active {
  background: var(--color-active);
  border-color: var(--color-active-border);
  color: var(--color-primary);
  font-weight: 600;
}

/* Comments toggle */
.comments-toggle {
  background: transparent;
  border: none;
  color: var(--color-primary);
  cursor: pointer;
  font-size: 0.875rem;
  padding: 6px 0;
  min-height: auto;
  font-weight: 500;
}

/* Comments section */
.comments-section {
  margin-top: 16px;
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

.comment {
  margin-bottom: 12px;
  padding: 10px;
  background: var(--color-bg);
  border-radius: var(--radius);
  font-size: 0.875rem;
}

.comment-author {
  font-weight: 600;
  margin-right: 6px;
}

.comment-date {
  color: var(--color-muted);
  font-size: 0.8rem;
}

.comment-body {
  margin-top: 4px;
}

.add-comment-form {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.add-comment-form input {
  flex: 1;
  min-height: 44px;
}

.add-comment-form button {
  white-space: nowrap;
}

/* Error message */
.error-msg {
  color: var(--color-danger);
  font-size: 0.875rem;
  margin-top: 8px;
}

/* Empty state */
.empty-state {
  text-align: center;
  color: var(--color-muted);
  padding: 48px 16px;
  font-size: 1rem;
}