/* Glimpse Design System - Minimal, Monochrome, Photography-First */

/* CSS Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Colors - Monochrome palette */
  --color-black: #000000;
  --color-gray-900: #1a1a1a;
  --color-gray-800: #333333;
  --color-gray-700: #4d4d4d;
  --color-gray-600: #666666;
  --color-gray-500: #808080;
  --color-gray-400: #999999;
  --color-gray-300: #cccccc;
  --color-gray-200: #e5e5e5;
  --color-gray-100: #f5f5f5;
  --color-white: #ffffff;

  /* Typography */
  --font-serif: 'Spectral', Georgia, serif;
  --font-sans: 'Work Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;

  /* Layout */
  --max-width-content: 640px;
  --max-width-wide: 1200px;
  --nav-height: 64px;
}

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-gray-900);
  background: var(--color-white);
  padding-top: var(--nav-height);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--space-sm);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

p {
  margin-bottom: var(--space-sm);
}

a {
  color: var(--color-black);
  text-decoration: none;
  transition: opacity 0.2s;
}

a:hover {
  opacity: 0.6;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  z-index: 1000;
}

.navbar-container {
  max-width: var(--max-width-wide);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.navbar-nav {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
  list-style: none;
}

.navbar-link {
  font-size: 0.9rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Container */
.container {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
}

.container-wide {
  max-width: var(--max-width-wide);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 2px solid var(--color-black);
  background: var(--color-white);
  color: var(--color-black);
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}

.btn:hover {
  background: var(--color-black);
  color: var(--color-white);
  opacity: 1;
}

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

.btn-primary:hover {
  background: var(--color-gray-800);
  border-color: var(--color-gray-800);
  opacity: 1;
}

.btn-block {
  display: block;
  width: 100%;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

/* Forms */
.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  margin-bottom: var(--space-xs);
  font-size: 0.9rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-gray-700);
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  border: 1px solid var(--color-gray-300);
  background: var(--color-white);
  transition: border-color 0.2s;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-black);
}

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

.form-error {
  margin-bottom: var(--space-md);
  padding: var(--space-sm);
  background: var(--color-gray-100);
  border-left: 3px solid var(--color-black);
  font-size: 0.9rem;
}

/* Auth Pages */
.auth-container {
  max-width: 400px;
  margin: var(--space-2xl) auto;
  padding: var(--space-xl) var(--space-lg);
  border: 1px solid var(--color-gray-200);
}

.auth-title {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.auth-footer {
  margin-top: var(--space-lg);
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-gray-600);
}

/* Feed */
.feed {
  padding: var(--space-xl) 0;
}

.photo-card {
  margin-bottom: var(--space-2xl);
  background: var(--color-white);
}

.photo-card-header {
  display: flex;
  align-items: center;
  margin-bottom: var(--space-sm);
  padding: 0 var(--space-xs);
}

.photo-card-username {
  font-weight: 600;
  font-size: 0.95rem;
}

.photo-card-time {
  margin-left: auto;
  font-size: 0.85rem;
  color: var(--color-gray-500);
}

.photo-card-image {
  width: 100%;
  height: auto;
  display: block;
  margin-bottom: var(--space-sm);
}

.photo-card-actions {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
  padding: 0 var(--space-xs);
}

.photo-card-btn {
  background: none;
  border: none;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  cursor: pointer;
  color: var(--color-gray-700);
  transition: color 0.2s;
}

.photo-card-btn:hover {
  color: var(--color-black);
}

.photo-card-btn.liked {
  color: var(--color-black);
  font-weight: 600;
}

.photo-card-stats {
  margin-bottom: var(--space-sm);
  padding: 0 var(--space-xs);
  font-size: 0.9rem;
  font-weight: 600;
}

.photo-card-caption {
  padding: 0 var(--space-xs);
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.6;
}

.photo-card-caption-username {
  font-weight: 600;
  margin-right: var(--space-xs);
}

.photo-card-comments {
  margin-top: var(--space-sm);
  padding: 0 var(--space-xs);
}

.photo-card-comment {
  margin-bottom: var(--space-xs);
  font-size: 0.95rem;
}

.comment-username {
  font-weight: 600;
  margin-right: var(--space-xs);
}

.comment-form {
  margin-top: var(--space-sm);
  padding: var(--space-sm) var(--space-xs) 0;
  border-top: 1px solid var(--color-gray-200);
}

.comment-input-wrapper {
  display: flex;
  gap: var(--space-sm);
}

.comment-input {
  flex: 1;
  border: none;
  padding: var(--space-xs) 0;
  font-family: var(--font-sans);
  font-size: 0.95rem;
}

.comment-input:focus {
  outline: none;
}

.comment-submit {
  background: none;
  border: none;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-gray-500);
  cursor: pointer;
  transition: color 0.2s;
}

.comment-submit:hover:not(:disabled) {
  color: var(--color-black);
}

.comment-submit:disabled {
  cursor: not-allowed;
  opacity: 0.3;
}

/* Profile */
.profile-header {
  display: flex;
  align-items: center;
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-gray-200);
}

.profile-info {
  flex: 1;
}

.profile-username {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

.profile-stats {
  font-size: 0.95rem;
  color: var(--color-gray-600);
  margin-bottom: var(--space-md);
}

.profile-photos {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
}

.profile-photo {
  position: relative;
  padding-bottom: 100%;
  overflow: hidden;
  background: var(--color-gray-100);
}

.profile-photo img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity 0.2s;
}

.profile-photo:hover img {
  opacity: 0.8;
}

/* Upload Page */
.upload-form {
  max-width: 600px;
  margin: 0 auto;
}

.file-input-wrapper {
  position: relative;
  overflow: hidden;
  display: inline-block;
  width: 100%;
  margin-bottom: var(--space-md);
}

.file-input-label {
  display: block;
  padding: var(--space-xl);
  text-align: center;
  border: 2px dashed var(--color-gray-300);
  background: var(--color-gray-100);
  cursor: pointer;
  transition: border-color 0.2s;
}

.file-input-label:hover {
  border-color: var(--color-gray-500);
}

.file-input {
  position: absolute;
  left: -9999px;
}

.preview-image {
  max-width: 100%;
  height: auto;
  margin-bottom: var(--space-md);
}

/* Photo Detail Page */
.photo-detail {
  max-width: 900px;
  margin: 0 auto;
}

.photo-detail-image {
  width: 100%;
  height: auto;
  margin-bottom: var(--space-lg);
}

.photo-detail-info {
  padding: 0 var(--space-md);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--space-2xl) var(--space-md);
  color: var(--color-gray-500);
}

.empty-state-title {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
  color: var(--color-gray-700);
}

.empty-state-text {
  font-size: 1rem;
  margin-bottom: var(--space-lg);
}

/* Utility Classes */
.text-center { text-align: center; }
.text-muted { color: var(--color-gray-600); }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }

/* Responsive */
@media (max-width: 768px) {
  :root {
    --space-xl: 2rem;
    --space-2xl: 3rem;
  }

  .navbar-container {
    padding: 0 var(--space-sm);
  }

  .navbar-nav {
    gap: var(--space-md);
  }

  .profile-photos {
    grid-template-columns: repeat(2, 1fr);
  }

  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
}

@media (max-width: 480px) {
  .navbar-logo {
    font-size: 1.25rem;
  }

  .navbar-nav {
    gap: var(--space-sm);
  }

  .navbar-link {
    font-size: 0.8rem;
  }

  .auth-container {
    border: none;
    padding: var(--space-lg) var(--space-md);
  }
}