@import url('https://fonts.googleapis.com/css2?family=Crimson+Pro:wght@400;600;700&family=Work+Sans:wght@300;400;500;600&display=swap');

:root {
  --cream-white: #FDFBF7;
  --warm-gray: #F5F3EF;
  --photo-border: #E8E5DF;
  --charcoal: #2C2C2C;
  --slate: #5A5A5A;
  --grain-blue: #4A90A4;
}

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

body {
  font-family: 'Work Sans', sans-serif;
  background-color: var(--cream-white);
  color: var(--charcoal);
  line-height: 1.6;
  padding-bottom: 80px; /* Space for mobile nav */
}

h1, h2, h3 {
  font-family: 'Crimson Pro', serif;
}

a {
  color: var(--grain-blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Top Navigation (Desktop) */
.top-nav {
  background-color: var(--warm-gray);
  border-bottom: 1px solid var(--photo-border);
  padding: 1rem 2rem;
  display: none;
}

.top-nav-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.top-nav h1 {
  font-size: 1.8rem;
  color: var(--charcoal);
}

.top-nav nav a {
  margin-left: 2rem;
  font-weight: 500;
}

/* Mobile Bottom Navigation */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--warm-gray);
  border-top: 1px solid var(--photo-border);
  display: flex;
  justify-content: space-around;
  padding: 1rem 0;
  z-index: 100;
}

.bottom-nav a {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 0.8rem;
  color: var(--slate);
  gap: 0.25rem;
}

.bottom-nav a:hover {
  color: var(--grain-blue);
  text-decoration: none;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
}

/* Landing/Auth Pages */
.auth-container {
  max-width: 450px;
  margin: 4rem auto;
  padding: 2rem;
  background-color: var(--warm-gray);
  border: 1px solid var(--photo-border);
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.auth-container h1 {
  text-align: center;
  margin-bottom: 0.5rem;
  font-size: 2.5rem;
}

.auth-container p {
  text-align: center;
  color: var(--slate);
  margin-bottom: 2rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--charcoal);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--photo-border);
  border-radius: 4px;
  font-family: 'Work Sans', sans-serif;
  font-size: 1rem;
  background-color: white;
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  background-color: var(--grain-blue);
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-family: 'Work Sans', sans-serif;
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
  width: 100%;
}

.btn:hover {
  background-color: #3a7a8d;
  text-decoration: none;
}

.btn-secondary {
  background-color: var(--slate);
}

.btn-secondary:hover {
  background-color: #4a4a4a;
}

.auth-links {
  text-align: center;
  margin-top: 1.5rem;
  color: var(--slate);
}

.error-message {
  background-color: #fdecea;
  color: #c53030;
  padding: 0.75rem;
  border-radius: 4px;
  margin-bottom: 1rem;
  text-align: center;
}

.success-message {
  background-color: #e6f7ed;
  color: #2d6a4f;
  padding: 0.75rem;
  border-radius: 4px;
  margin-bottom: 1rem;
  text-align: center;
}

/* Photo Feed */
.feed-header {
  text-align: center;
  margin: 2rem 0;
}

.feed-header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.photo-card {
  max-width: 600px;
  margin: 0 auto 2rem;
  background-color: var(--warm-gray);
  border: 1px solid var(--photo-border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.photo-card-header {
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--photo-border);
}

.photo-card-header .username {
  font-weight: 600;
  color: var(--charcoal);
}

.photo-card-header .timestamp {
  font-size: 0.875rem;
  color: var(--slate);
}

.photo-card-image {
  width: 100%;
  height: auto;
  display: block;
  background-color: var(--photo-border);
}

.photo-card-content {
  padding: 1rem;
}

.photo-card-caption {
  color: var(--charcoal);
  line-height: 1.6;
}

.load-more-container {
  text-align: center;
  margin: 2rem 0 3rem;
}

.btn-load-more {
  width: auto;
  padding: 0.75rem 3rem;
}

/* Profile Page */
.profile-header {
  max-width: 600px;
  margin: 2rem auto;
  padding: 2rem;
  background-color: var(--warm-gray);
  border: 1px solid var(--photo-border);
  border-radius: 8px;
}

.profile-header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.profile-header .join-date {
  color: var(--slate);
  font-size: 0.95rem;
}

.profile-photos-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  margin-top: 2rem;
}

.profile-photo-item {
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: 4px;
}

.profile-photo-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Upload Page */
.upload-container {
  max-width: 600px;
  margin: 2rem auto;
  padding: 2rem;
  background-color: var(--warm-gray);
  border: 1px solid var(--photo-border);
  border-radius: 8px;
}

.upload-container h1 {
  margin-bottom: 1.5rem;
}

.file-input-wrapper {
  position: relative;
  margin-bottom: 1rem;
}

.file-input-wrapper input[type="file"] {
  padding: 0.5rem;
}

.image-preview {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  margin-top: 1rem;
  display: none;
}

.image-preview.visible {
  display: block;
}

/* Photo Detail Page */
.photo-detail {
  max-width: 800px;
  margin: 2rem auto;
}

.photo-detail-image {
  width: 100%;
  height: auto;
  border-radius: 8px;
  margin-bottom: 1.5rem;
}

.photo-detail-info {
  background-color: var(--warm-gray);
  padding: 1.5rem;
  border: 1px solid var(--photo-border);
  border-radius: 8px;
}

.photo-detail-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--photo-border);
}

/* Empty States */
.empty-state {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--slate);
}

.empty-state h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--charcoal);
}

/* Desktop Styles */
@media (min-width: 768px) {
  body {
    padding-bottom: 0;
  }

  .top-nav {
    display: block;
  }

  .bottom-nav {
    display: none;
  }

  .container {
    padding: 2rem;
  }

  .photo-card {
    margin-bottom: 2.5rem;
  }
}

/* Mobile Adjustments */
@media (max-width: 767px) {
  .profile-photos-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .auth-container {
    margin: 2rem 1rem;
  }

  .upload-container {
    margin: 1rem;
  }

  .profile-header {
    margin: 1rem;
  }

  .photo-detail {
    margin: 1rem;
  }
}