/* CSS Reset & Variables */
:root {
  --bg-primary: #f5f7fb;
  --bg-card: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  
  --primary: #6366f1; /* Lavender / Indigo accent */
  --primary-hover: #4f46e5;
  --primary-light: #e0e7ff;
  --primary-light-hover: #c7d2fe;
  
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  
  --border-color: #e2e8f0;
  --border-focus: #a5b4fc;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 10px 30px rgba(99, 102, 241, 0.05);
  --shadow-lg: 0 20px 40px rgba(99, 102, 241, 0.08);
  
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  
  --font-sans: 'Outfit', 'Noto Sans KR', sans-serif;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Header Styles */
.main-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.header-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.5px;
  transition: var(--transition);
}

.logo-area:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.logo-icon {
  background-color: var(--primary);
  color: var(--text-inverse);
  width: 38px;
  height: 38px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.logo-icon i {
  width: 20px;
  height: 20px;
}

/* Push Status Box */
.push-status-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 0.5rem 0.85rem;
  border-radius: 14px;
  transition: var(--transition);
}

.push-info {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.push-title {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-main);
}

.push-subtitle {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.push-toggle-btn {
  background-color: #cbd5e1;
  border: none;
  width: 44px;
  height: 24px;
  border-radius: 12px;
  position: relative;
  cursor: pointer;
  outline: none;
  transition: var(--transition);
}

.push-toggle-btn.active {
  background-color: var(--success);
}

.toggle-slider {
  background-color: var(--text-inverse);
  width: 18px;
  height: 18px;
  border-radius: 50%;
  position: absolute;
  top: 3px;
  left: 3px;
  transition: var(--transition);
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
}

.push-toggle-btn.active .toggle-slider {
  transform: translateX(20px);
}

/* Main Container */
.main-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* Hero Section */
.hero-section {
  text-align: center;
  padding: 1rem 0;
}

.hero-section h1 {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--primary), #4f46e5);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-section p {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Cards & Panels */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-lg);
}

.card-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary);
}

.card-header i {
  width: 22px;
  height: 22px;
}

.card-header h2 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

/* Forms */
.write-form {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 500px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
}

.form-group label .tip {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--primary);
  margin-left: 0.25rem;
}

.form-group input,
.form-group textarea {
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-primary);
  color: var(--text-main);
  outline: none;
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  background-color: var(--bg-card);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.submit-btn {
  font-family: inherit;
  background-color: var(--primary);
  color: var(--text-inverse);
  border: none;
  font-weight: 600;
  font-size: 1rem;
  padding: 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
  transition: var(--transition);
}

.submit-btn:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(99, 102, 241, 0.35);
}

.submit-btn:active {
  transform: translateY(0);
}

/* Image Preview */
.image-preview-container {
  position: relative;
  border-radius: var(--radius-sm);
  overflow: hidden;
  max-width: 280px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  margin-top: 0.5rem;
  align-self: flex-start;
}

.image-preview-container img {
  width: 100%;
  height: auto;
  display: block;
}

.remove-img-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background-color: rgba(239, 68, 110, 0.9);
  color: var(--text-inverse);
  border: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
  transition: var(--transition);
}

.remove-img-btn:hover {
  background-color: var(--danger);
  transform: scale(1.1);
}

.remove-img-btn i {
  width: 16px;
  height: 16px;
}

/* Feed & Posts */
.feed-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.feed-title-area {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.feed-title-area i {
  color: var(--primary);
  width: 22px;
  height: 22px;
}

.feed-title-area h2 {
  font-size: 1.25rem;
  font-weight: 700;
}

.search-box {
  position: relative;
  min-width: 260px;
}

@media (max-width: 500px) {
  .search-box {
    width: 100%;
  }
}

.search-box input {
  font-family: inherit;
  font-size: 0.9rem;
  padding: 0.6rem 1rem 0.6rem 2.25rem;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  width: 100%;
  outline: none;
  background-color: var(--bg-card);
  transition: var(--transition);
}

.search-box input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  width: 16px;
  height: 16px;
}

.feed-loading {
  text-align: center;
  padding: 3rem;
  color: var(--text-muted);
}

.loading-spinner {
  border: 3px solid var(--border-color);
  border-top: 3px solid var(--primary);
  border-radius: 50%;
  width: 28px;
  height: 28px;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 0.75rem;
}

.spinner {
  border: 2px solid rgba(255,255,255,0.3);
  border-top: 2px solid #ffffff;
  border-radius: 50%;
  width: 16px;
  height: 16px;
  animation: spin 0.8s linear infinite;
}

/* Post Item Card */
.posts-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.post-card {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.post-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.meta-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.user-avatar {
  background-color: var(--primary-light);
  color: var(--primary);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
}

.user-name {
  font-weight: 600;
  font-size: 0.9rem;
}

.post-time {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.btn-delete-post {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.btn-delete-post:hover {
  color: var(--danger);
  background-color: rgba(239, 68, 68, 0.08);
}

.btn-delete-post i {
  width: 16px;
  height: 16px;
}

.post-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.35;
}

.post-content {
  font-size: 0.95rem;
  color: #334155;
  white-space: pre-wrap;
  word-break: break-all;
}

.post-image {
  max-width: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  align-self: flex-start;
  max-height: 400px;
  object-fit: contain;
}

/* Comments Section */
.comments-divider {
  height: 1px;
  background-color: var(--border-color);
  margin: 0.5rem 0;
}

.comments-header {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.comments-header i {
  width: 16px;
  height: 16px;
}

.comments-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 1rem;
}

.comment-item {
  background-color: var(--bg-primary);
  padding: 0.75rem 1rem;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.comment-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.comment-author {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-main);
}

.comment-time {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.comment-body {
  font-size: 0.9rem;
  color: #334155;
  white-space: pre-wrap;
  word-break: break-all;
}

/* Comment Form */
.comment-form {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.comment-form-row {
  display: grid;
  grid-template-columns: 140px 1fr auto;
  gap: 0.5rem;
  align-items: stretch;
}

@media (max-width: 500px) {
  .comment-form-row {
    grid-template-columns: 1fr;
  }
}

.comment-form input {
  font-family: inherit;
  font-size: 0.85rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-primary);
  outline: none;
  transition: var(--transition);
}

.comment-form input:focus {
  border-color: var(--primary);
  background-color: var(--bg-card);
}

.btn-comment-submit {
  font-family: inherit;
  background-color: var(--primary-light);
  color: var(--primary);
  border: none;
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

/* Modal Window */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
  background-color: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.modal-content {
  width: 100%;
  max-width: 400px;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  animation: modal-pop 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
}

.modal-content p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.modal-content input {
  font-family: inherit;
  font-size: 0.95rem;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  outline: none;
}

.modal-content input:focus {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

.btn {
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.btn-muted {
  background-color: #f1f5f9;
  color: var(--text-muted);
}

.btn-muted:hover {
  background-color: #e2e8f0;
}

.btn-danger {
  background-color: var(--danger);
  color: var(--text-inverse);
  box-shadow: 0 2px 6px rgba(239, 68, 68, 0.2);
}

.btn-danger:hover {
  background-color: #dc2626;
}

/* Animations */
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes modal-pop {
  from {
    transform: scale(0.95);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.animate-fade-in {
  animation: fade-in 0.4s ease;
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.main-footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border-color);
  margin-top: 2rem;
}