.kc-container { font-family: 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif; background: #f5f5f3; color: #333; box-sizing: border-box; }
.kc-container * { box-sizing: border-box; }
.kc-page { display: none; padding: 2rem; }
.kc-page.active { display: block; }
.kc-title { font-size: 18px; font-weight: 500; margin-bottom: 0.4rem; color: #333; }
.kc-subtitle { font-size: 13px; color: #aaa; margin-bottom: 1.2rem; }
.kc-top-bar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; flex-wrap: wrap; gap: 10px; }
.kc-nav-bar { display: flex; gap: 8px; }
.kc-nav-btn { padding: 7px 18px; border-radius: 99px; border: 1px solid #ddd; background: #fff; font-size: 13px; color: #555; cursor: pointer; }
.kc-nav-btn.active { background: #222; color: #fff; border-color: #222; }
.kc-lang-toggle { display: flex; border: 1px solid #ddd; border-radius: 99px; overflow: hidden; }
.kc-lang-btn { padding: 7px 16px; border: none; background: #fff; font-size: 13px; color: #888; cursor: pointer; transition: 0.2s; }
.kc-lang-btn.active { background: #4A90D9; color: #fff; }
.kc-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }
.kc-card-wrap { perspective: 900px; }
.kc-card { position: relative; width: 100%; height: 240px; transform-style: preserve-3d; transition: transform 0.5s ease; cursor: pointer; }
.kc-card.flip { transform: rotateY(180deg); }
.kc-face { position: absolute; inset: 0; backface-visibility: hidden; border-radius: 14px; border: 1px solid #e0e0e0; padding: 1.25rem; }
.kc-front { background: #ffffff; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.kc-back { transform: rotateY(180deg); background: #fafafa; display: flex; flex-direction: column; overflow-y: auto; }
.kc-theme-label { font-size: 11px; letter-spacing: 1px; color: #aaa; margin-bottom: 8px; }
.kc-theme-name { font-size: 30px; font-weight: 600; line-height: 1.2; }
.kc-theme-de { font-size: 13px; color: #aaa; margin-top: 5px; }
.kc-accent { width: 28px; height: 3px; border-radius: 99px; margin-top: 10px; }
.kc-back-title { font-size: 11px; letter-spacing: 1px; color: #aaa; margin-bottom: 10px; }
.kc-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.kc-chip { padding: 5px 12px; border-radius: 99px; font-size: 12px; background: #fff; border: 1px solid #e0e0e0; color: #444; cursor: pointer; transition: 0.2s; }
.kc-chip:hover { background: #eef6ff; border-color: #4A90D9; color: #4A90D9; }
.kc-hint { text-align: center; font-size: 11px; color: #bbb; margin-top: auto; padding-top: 10px; }