/* ========== 변수 ========== */
:root {
  --bg-main: #0c0c18;
  --bg-surface: #13132a;
  --bg-glass: rgba(255, 255, 255, 0.06);
  --bg-glass-hover: rgba(255, 255, 255, 0.10);
  --glass-border: rgba(255, 255, 255, 0.12);
  --glass-blur: 20px;
  --text-primary: #f0f0f5;
  --text-secondary: #8888a0;
  --text-muted: #555570;
  --accent: #7c6cff;
  --accent-hover: #8d7fff;
  --accent-dim: rgba(124, 108, 255, 0.15);
  --danger: #ff5c5c;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ========== 리셋 ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font);
  background: var(--bg-main);
  color: var(--text-primary);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

input, select, textarea, button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  border: none;
  outline: none;
  background: none;
}

/* ========== 글라스모피즘 ========== */
.glass {
  background: var(--bg-glass);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
}

/* ========== 헤더 ========== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-radius: 0;
  border-left: none;
  border-right: none;
  border-top: none;
}

.logo {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--accent);
}

.header-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.btn-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.btn-icon:hover {
  background: var(--bg-glass-hover);
  color: var(--text-primary);
}

.btn-add {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 22px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, transform 0.15s;
}
.btn-add:hover { background: var(--accent-hover); }
.btn-add:active { transform: scale(0.92); }

/* ========== 검색바 ========== */
.search-bar {
  padding: 0 20px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}
.search-bar.open {
  max-height: 60px;
  padding: 10px 20px;
}
.search-bar input {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--bg-glass);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  font-size: 14px;
}
.search-bar input::placeholder { color: var(--text-muted); }

/* ========== 카테고리 바 ========== */
.category-bar {
  display: flex;
  gap: 8px;
  padding: 14px 20px 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.category-bar::-webkit-scrollbar { display: none; }

.cat-chip {
  flex-shrink: 0;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  color: var(--text-secondary);
  background: var(--bg-glass);
  border: 1px solid var(--glass-border);
  transition: all 0.2s;
  white-space: nowrap;
}
.cat-chip:hover { background: var(--bg-glass-hover); color: var(--text-primary); }
.cat-chip.active {
  background: var(--accent-dim);
  color: var(--accent);
  border-color: var(--accent);
}

/* 카테고리 관리 버튼 */
.cat-chip.manage {
  color: var(--text-muted);
  border-style: dashed;
}

/* ========== 활성 태그 ========== */
.active-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0 20px;
  min-height: 0;
}
.active-tags:not(:empty) {
  padding-top: 8px;
}

.active-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 14px;
  font-size: 12px;
  background: var(--accent-dim);
  color: var(--accent);
  cursor: pointer;
}
.active-tag .remove { font-size: 14px; opacity: 0.7; }

/* ========== 링크 그리드 ========== */
.link-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px 20px 80px;
}

@media (min-width: 768px) {
  .link-grid { padding: 14px 32px 80px; max-width: 720px; margin: 0 auto; }
}

/* ========== 링크 카드 (목차형) ========== */
.link-card {
  display: flex;
  align-items: center;
  gap: 14px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  cursor: pointer;
  padding: 10px 14px;
  transition: transform 0.15s, border-color 0.2s;
  animation: cardIn 0.35s ease both;
}
.link-card:hover {
  transform: translateX(2px);
  border-color: rgba(255, 255, 255, 0.2);
}

.card-thumb {
  width: 56px;
  height: 56px;
  min-width: 56px;
  border-radius: var(--radius-xs);
  background: var(--bg-surface);
  overflow: hidden;
  position: relative;
}
.card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.card-thumb .no-thumb {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--text-muted);
}

.card-body {
  flex: 1;
  min-width: 0;
  padding: 0;
}

.card-domain {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 2px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.card-domain img {
  width: 12px;
  height: 12px;
  border-radius: 2px;
}

.card-title {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.35;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 4px;
}
.tag {
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 11px;
  color: var(--accent);
  background: var(--accent-dim);
  cursor: pointer;
  transition: background 0.15s;
}
.tag:hover { background: rgba(124, 108, 255, 0.25); }

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  color: var(--text-muted);
}

.card-delete {
  opacity: 0;
  color: var(--danger);
  cursor: pointer;
  font-size: 12px;
  transition: opacity 0.2s;
}
.link-card:hover .card-delete { opacity: 1; }

/* 모바일: 삭제 항상 보이기 */
@media (max-width: 639px) {
  .card-delete { opacity: 0.5; }
}

/* ========== 스켈레톤 ========== */
.skeleton-card {
  border-radius: var(--radius);
  height: 220px;
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.7; }
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ========== 빈 상태 ========== */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-secondary);
}
.empty-icon { font-size: 48px; margin-bottom: 16px; }
.empty-sub { font-size: 13px; color: var(--text-muted); margin-top: 6px; }

/* ========== 모달 ========== */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}
@media (min-width: 640px) {
  .modal-overlay { align-items: center; }
}

.modal {
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 24px 20px;
  animation: slideUp 0.3s ease;
}
@media (min-width: 640px) {
  .modal { border-radius: var(--radius); }
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { transform: translateY(100%); } to { transform: translateY(0); } }

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}
.modal-header h2 { font-size: 18px; font-weight: 600; }
.btn-close {
  font-size: 24px;
  cursor: pointer;
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}
.btn-close:hover { background: var(--bg-glass-hover); }

/* OG 미리보기 */
.og-preview {
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 16px;
  position: relative;
  background: var(--bg-surface);
}
.og-preview img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
}
.og-domain {
  position: absolute;
  bottom: 8px;
  left: 8px;
  padding: 2px 8px;
  border-radius: var(--radius-xs);
  background: rgba(0, 0, 0, 0.6);
  font-size: 11px;
  color: #fff;
}

/* 폼 */
.form-group {
  margin-bottom: 16px;
}
.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--radius-xs);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
  font-size: 14px;
  transition: border-color 0.2s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
}
.form-group select {
  appearance: none;
  cursor: pointer;
}
.form-group textarea { resize: vertical; }

.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-muted); }

.url-loading {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
}
.spinner {
  width: 14px;
  height: 14px;
  border: 2px solid var(--glass-border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* 태그 입력 */
.tag-input-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px 10px;
  border-radius: var(--radius-xs);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
  min-height: 42px;
  align-items: center;
  transition: border-color 0.2s;
}
.tag-input-wrap:focus-within { border-color: var(--accent); }

.tag-chips { display: flex; flex-wrap: wrap; gap: 4px; }

.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 3px 8px;
  border-radius: 10px;
  font-size: 12px;
  background: var(--accent-dim);
  color: var(--accent);
}
.tag-chip .remove {
  cursor: pointer;
  opacity: 0.7;
  font-size: 13px;
}
.tag-chip .remove:hover { opacity: 1; }

.tag-input-wrap input {
  flex: 1;
  min-width: 80px;
  border: none;
  background: none;
  padding: 2px 0;
  font-size: 13px;
}

.btn-submit {
  width: 100%;
  padding: 12px;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
.btn-submit:hover { background: var(--accent-hover); }
.btn-submit:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ========== 카테고리 관리 모달 ========== */
.cat-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}
.cat-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-xs);
  background: rgba(255, 255, 255, 0.03);
  transition: background 0.15s, transform 0.15s;
  user-select: none;
}
.cat-item.dragging {
  opacity: 0.5;
  background: var(--accent-dim);
}
.cat-drag-handle {
  cursor: grab;
  color: var(--text-muted);
  font-size: 16px;
  flex-shrink: 0;
  touch-action: none;
}
.cat-drag-handle:active { cursor: grabbing; }
.cat-item-name { font-size: 14px; flex: 1; }
.cat-item-delete {
  color: var(--danger);
  cursor: pointer;
  font-size: 13px;
  opacity: 0.6;
}
.cat-item-delete:hover { opacity: 1; }

.cat-add-row {
  display: flex;
  gap: 8px;
  align-items: center;
}
.input-emoji {
  width: 44px;
  text-align: center;
  padding: 8px;
  border-radius: var(--radius-xs);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
  font-size: 18px;
}
.cat-add-row input:not(.input-emoji) {
  flex: 1;
  padding: 8px 10px;
  border-radius: var(--radius-xs);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
  font-size: 14px;
}
.btn-small {
  padding: 8px 14px;
  border-radius: var(--radius-xs);
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
}

/* ========== 토스트 ========== */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  font-size: 13px;
  color: var(--text-primary);
  z-index: 300;
  transition: transform 0.3s ease;
  pointer-events: none;
}
.toast.show {
  transform: translateX(-50%) translateY(0);
}