:root{--font-en: "Nunito", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-th: "Prompt", sans-serif;--duo-green: #58CC02;--duo-green-lip: #46A302;--duo-blue: #1CB0F6;--duo-blue-lip: #1899D6;--duo-red: #FF4B4B;--duo-red-lip: #EA2B2B;--duo-yellow: #FFC800;--duo-yellow-lip: #E5B400;--duo-orange: #FF9600;--duo-orange-lip: #E08500;--bg-app: #F7F7F7;--bg-card: #FFFFFF;--bg-topbar: #FFFFFF;--bg-overlay: rgba(0, 0, 0, .45);--border-card: #E5E5E5;--lip-card: #CECECE;--text-primary: #3C3C3C;--text-secondary: #777777;--text-muted: #AFAFAF;--btn-neutral-bg: #FFFFFF;--btn-neutral-border: #E5E5E5;--btn-neutral-lip: #CECECE;--btn-neutral-text: #4B4B4B;--drawer-bg: #FFFFFF;--drawer-item-bg: #F7F7F7;--drawer-item-border: #E5E5E5}[data-theme=dark]{--bg-app: #131F24;--bg-card: #202F36;--bg-topbar: #131F24;--bg-overlay: rgba(0, 0, 0, .7);--border-card: #37464F;--lip-card: #28373F;--text-primary: #FFFFFF;--text-secondary: #AFAFAF;--text-muted: #778994;--btn-neutral-bg: #202F36;--btn-neutral-border: #37464F;--btn-neutral-lip: #28373F;--btn-neutral-text: #E5E5E5;--drawer-bg: #202F36;--drawer-item-bg: #19262C;--drawer-item-border: #37464F}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent;-webkit-user-select:none;user-select:none}html,body{width:100%;height:100%;background-color:var(--bg-app);color:var(--text-primary);font-family:var(--font-en);overflow-x:hidden;transition:background-color .2s ease,color .2s ease}#root{display:flex;justify-content:center;align-items:center;min-height:100vh;min-height:100dvh;width:100%;background-color:var(--bg-app)}.app-container{width:100%;max-width:440px;height:100vh;height:100dvh;display:flex;flex-direction:column;position:relative;background-color:var(--bg-app);overflow:hidden}.top-bar{height:52px;min-height:52px;display:flex;align-items:center;justify-content:space-between;padding:0 16px;background-color:var(--bg-topbar);border-bottom:2px solid var(--border-card);flex-wrap:nowrap;white-space:nowrap;z-index:10}.top-bar-left,.top-bar-right{display:flex;align-items:center;flex-wrap:nowrap;gap:8px}.duo-btn-level{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:38px;padding:0 12px;background-color:var(--btn-neutral-bg);border:2px solid var(--btn-neutral-border);border-bottom:4px solid var(--btn-neutral-lip);border-radius:14px;color:var(--text-primary);font-family:var(--font-en);font-weight:800;font-size:15px;cursor:pointer;transition:transform .08s ease,border-bottom-width .08s ease,filter .15s ease}.duo-btn-level:active{transform:translateY(2px);border-bottom-width:2px}.duo-btn-fav{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:38px;padding:0 12px;background-color:var(--btn-neutral-bg);border:2px solid var(--btn-neutral-border);border-bottom:4px solid var(--btn-neutral-lip);border-radius:14px;color:var(--duo-red);font-family:var(--font-en);font-weight:800;font-size:14px;cursor:pointer;transition:transform .08s ease,border-bottom-width .08s ease}.duo-btn-fav:active{transform:translateY(2px);border-bottom-width:2px}.duo-btn-theme{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;background-color:var(--btn-neutral-bg);border:2px solid var(--btn-neutral-border);border-bottom:4px solid var(--btn-neutral-lip);border-radius:14px;color:var(--text-primary);cursor:pointer;transition:transform .08s ease,border-bottom-width .08s ease}.duo-btn-theme:active{transform:translateY(2px);border-bottom-width:2px}.main-content{flex:1;display:flex;flex-direction:column;padding:12px 16px 8px;min-height:0;position:relative;overflow:hidden}.flashcard-frame{flex:1;display:flex;flex-direction:column;background-color:var(--bg-card);border:2px solid var(--border-card);border-bottom:6px solid var(--lip-card);border-radius:24px;overflow:hidden;position:relative;box-shadow:0 6px 16px #0000000a;touch-action:pan-y;transition:transform .15s ease,box-shadow .15s ease}.card-top-overlay{position:absolute;top:12px;left:12px;right:12px;display:flex;justify-content:space-between;align-items:center;z-index:5;pointer-events:none}.card-index-badge{pointer-events:auto;display:inline-flex;align-items:center;padding:4px 10px;background-color:#00000073;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);border-radius:12px;color:#fff;font-family:var(--font-en);font-size:13px;font-weight:800;letter-spacing:.5px}.card-favorite-btn{pointer-events:auto;display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;background-color:var(--btn-neutral-bg);border:2px solid var(--btn-neutral-border);border-bottom:4px solid var(--btn-neutral-lip);border-radius:14px;cursor:pointer;transition:transform .08s ease,border-bottom-width .08s ease}.card-favorite-btn:active{transform:translateY(2px);border-bottom-width:2px}.card-visual-area{flex:1;position:relative;background-color:#f0f4f7;overflow:hidden;display:flex;align-items:center;justify-content:center;min-height:180px}[data-theme=dark] .card-visual-area{background-color:#16242b}.card-image{width:100%;height:100%;object-fit:cover;display:block}.card-image--contain{object-fit:contain;padding:16px;background-color:#fff;box-sizing:border-box}[data-theme=dark] .card-image--contain{background-color:#fff}.card-bottom-box{background-color:var(--bg-card);padding:16px;display:flex;flex-direction:column;gap:10px;border-top:2px solid var(--border-card);z-index:4}.card-word-row{display:flex;align-items:center;justify-content:space-between;gap:12px}.card-word-info{flex:1;min-width:0}.card-word-title{font-size:24px;font-weight:900;color:var(--text-primary);line-height:1.2;word-break:break-word;text-transform:capitalize}.card-subhead{display:flex;align-items:center;gap:6px;margin-top:2px;font-size:14px;color:var(--text-secondary);font-weight:700}.card-phonetic{color:var(--duo-blue);font-weight:700}.card-pos{color:var(--text-muted);font-weight:700;text-transform:uppercase;font-size:12px}.duo-btn-audio{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;min-width:44px;background-color:var(--duo-blue);border:2px solid #1480B8;border-bottom:4px solid var(--duo-blue-lip);border-radius:14px;cursor:pointer;transition:transform .08s ease,border-bottom-width .08s ease}.duo-btn-audio:active{transform:translateY(2px);border-bottom-width:2px}.answer-section{display:flex;flex-direction:column;gap:8px;padding-top:4px;animation:answerFadeIn .2s ease-out}@keyframes answerFadeIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.answer-divider{height:2px;background-color:var(--border-card);border-radius:1px;margin:2px 0}.card-thai{font-family:var(--font-th);font-size:22px;font-weight:700;color:var(--duo-green);line-height:1.3}.card-definition{font-size:14px;line-height:1.4;color:var(--text-primary);font-weight:600}.card-example{font-size:13px;line-height:1.4;color:var(--text-secondary);font-style:italic}.bottom-bar{height:64px;min-height:64px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:0 16px 10px}.duo-action-btn{display:inline-flex;align-items:center;justify-content:center;border-radius:16px;cursor:pointer;outline:none;transition:transform .08s ease,border-bottom-width .08s ease,filter .1s ease}.btn-prev{width:56px;height:52px;background-color:var(--btn-neutral-bg);border:2px solid var(--btn-neutral-border);border-bottom:5px solid var(--btn-neutral-lip);color:var(--btn-neutral-text)}.btn-prev:active:not(:disabled){transform:translateY(2px);border-bottom-width:3px}.btn-prev:disabled{opacity:.4;cursor:not-allowed;border-bottom-width:4px}.btn-reveal{flex:1;height:52px;background-color:var(--duo-green);border:2px solid #3F8F02;border-bottom:5px solid var(--duo-green-lip);color:#fff}.btn-reveal:active{transform:translateY(2px);border-bottom-width:3px}.btn-next{width:56px;height:52px;background-color:var(--duo-blue);border:2px solid #1480B8;border-bottom:5px solid var(--duo-blue-lip);color:#fff}.btn-next:active{transform:translateY(2px);border-bottom-width:3px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background-color:var(--bg-overlay);-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);display:flex;align-items:center;justify-content:center;padding:16px;z-index:100;animation:fadeIn .15s ease-out}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal-sheet{width:100%;max-width:400px;max-height:85vh;background-color:var(--drawer-bg);border:2px solid var(--border-card);border-bottom:6px solid var(--lip-card);border-radius:24px;display:flex;flex-direction:column;overflow:hidden;box-shadow:0 12px 32px #0003;animation:slideUp .18s cubic-bezier(.16,1,.3,1)}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}.modal-header{height:54px;display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:2px solid var(--border-card)}.modal-title{font-size:18px;font-weight:800;color:var(--text-primary)}.modal-close-btn{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;background-color:transparent;border:none;border-radius:10px;color:var(--text-secondary);cursor:pointer;transition:background-color .15s ease}.modal-close-btn:hover{background-color:var(--border-card)}.modal-body{padding:16px;overflow-y:auto;display:flex;flex-direction:column;gap:12px}.level-list{display:flex;flex-direction:column;gap:10px}.level-item-btn{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background-color:var(--drawer-item-bg);border:2px solid var(--drawer-item-border);border-bottom:4px solid var(--btn-neutral-lip);border-radius:16px;cursor:pointer;transition:transform .08s ease,border-bottom-width .08s ease,border-color .15s ease}.level-item-btn:active{transform:translateY(2px);border-bottom-width:2px}.level-item-btn.active{border-color:var(--duo-blue);border-bottom-color:var(--duo-blue-lip);background-color:#1cb0f614}.level-item-left{display:flex;align-items:center;gap:12px}.level-badge{display:inline-flex;align-items:center;justify-content:center;width:40px;height:36px;background-color:var(--duo-blue);color:#fff;border-radius:10px;font-weight:900;font-size:16px}.level-info{display:flex;flex-direction:column;text-align:left}.level-name{font-size:15px;font-weight:800;color:var(--text-primary)}.level-progress{font-size:12px;font-weight:700;color:var(--text-secondary)}.level-reset-box{margin-top:8px;padding-top:12px;border-top:2px solid var(--border-card)}.btn-reset-level{width:100%;display:flex;align-items:center;justify-content:center;gap:8px;height:42px;background-color:var(--btn-neutral-bg);border:2px solid var(--border-card);border-bottom:4px solid var(--lip-card);border-radius:14px;color:var(--duo-red);font-family:var(--font-en);font-weight:800;font-size:14px;cursor:pointer;transition:transform .08s ease,border-bottom-width .08s ease}.btn-reset-level:active{transform:translateY(2px);border-bottom-width:2px}.favorites-list{display:flex;flex-direction:column;gap:10px;max-height:420px;overflow-y:auto}.favorite-item{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;background-color:var(--drawer-item-bg);border:2px solid var(--drawer-item-border);border-bottom:3px solid var(--btn-neutral-lip);border-radius:14px;gap:10px}.favorite-info{flex:1;min-width:0;text-align:left}.favorite-word{font-size:16px;font-weight:800;color:var(--text-primary);text-transform:capitalize}.favorite-thai{font-family:var(--font-th);font-size:14px;font-weight:600;color:var(--duo-green)}.favorite-actions{display:flex;align-items:center;gap:6px}.fav-action-btn{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;background-color:var(--btn-neutral-bg);border:2px solid var(--btn-neutral-border);border-bottom:3px solid var(--btn-neutral-lip);border-radius:10px;cursor:pointer;transition:transform .08s ease}.fav-action-btn:active{transform:translateY(1px);border-bottom-width:1px}.fav-empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:36px 16px;text-align:center;gap:10px;color:var(--text-secondary)}.fav-empty-title{font-size:16px;font-weight:800;color:var(--text-primary)}.fav-empty-desc{font-size:13px;max-width:240px;line-height:1.4}.practice-toggle-box{padding-top:10px;border-top:2px solid var(--border-card)}.practice-toggle-btn{width:100%;display:flex;align-items:center;justify-content:center;gap:8px;height:44px;background-color:var(--duo-green);border:2px solid #3F8F02;border-bottom:4px solid var(--duo-green-lip);border-radius:14px;color:#fff;font-family:var(--font-en);font-weight:800;font-size:15px;cursor:pointer;transition:transform .08s ease,border-bottom-width .08s ease}.practice-toggle-btn:active{transform:translateY(2px);border-bottom-width:2px}.practice-toggle-btn.active{background-color:var(--duo-yellow);border-color:#cfa300;border-bottom-color:var(--duo-yellow-lip);color:#3c3c3c}