:root{color-scheme:light;--md-sys-color-primary: #E85D04;--md-sys-color-on-primary: #FFFFFF;--md-sys-color-primary-container: #FFDBCB;--md-sys-color-on-primary-container: #331200;--md-sys-color-secondary: #7B5E57;--md-sys-color-on-secondary: #FFFFFF;--md-sys-color-secondary-container: #FFDBCF;--md-sys-color-on-secondary-container: #2C1512;--md-sys-color-tertiary: #6A5F3C;--md-sys-color-on-tertiary: #FFFFFF;--md-sys-color-tertiary-container: #F3E4B6;--md-sys-color-on-tertiary-container: #231B00;--md-sys-color-surface: #FFFBF8;--md-sys-color-surface-dim: #E4D8D2;--md-sys-color-surface-container-lowest: #FFFFFF;--md-sys-color-surface-container-low: #FFF1E9;--md-sys-color-surface-container: #FFEADF;--md-sys-color-surface-container-high: #FFE2D4;--md-sys-color-surface-container-highest: #FFDAC8;--md-sys-color-on-surface: #231917;--md-sys-color-on-surface-variant: #53433F;--md-sys-color-outline: #857370;--md-sys-color-outline-variant: #D8C2BC;--md-sys-color-error: #BA1A1A;--md-sys-color-on-error: #FFFFFF;--md-sys-color-error-container: #FFDAD6;--md-sys-color-success: #3B8940;--md-sys-color-on-success: #FFFFFF;--md-sys-color-success-container: #B8F5B0;--md-sys-elevation-1: 0 1px 3px rgba(0, 0, 0, .08), 0 1px 2px rgba(0, 0, 0, .06);--md-sys-elevation-2: 0 3px 6px rgba(0, 0, 0, .08), 0 2px 4px rgba(0, 0, 0, .06);--md-sys-elevation-3: 0 6px 12px rgba(0, 0, 0, .07), 0 4px 8px rgba(0, 0, 0, .05);--md-sys-elevation-4: 0 8px 16px rgba(0, 0, 0, .06), 0 6px 12px rgba(0, 0, 0, .04);--md-sys-elevation-5: 0 12px 24px rgba(0, 0, 0, .06), 0 8px 16px rgba(0, 0, 0, .04);--md-sys-shape-corner-none: 0;--md-sys-shape-corner-extra-small: 4px;--md-sys-shape-corner-small: 8px;--md-sys-shape-corner-medium: 16px;--md-sys-shape-corner-large: 20px;--md-sys-shape-corner-extra-large: 28px;--md-sys-shape-corner-full: 9999px;--md-sys-motion-duration-short1: 50ms;--md-sys-motion-duration-short2: .1s;--md-sys-motion-duration-short3: .15s;--md-sys-motion-duration-short4: .2s;--md-sys-motion-duration-medium1: .25s;--md-sys-motion-duration-medium2: .3s;--md-sys-motion-duration-medium3: .35s;--md-sys-motion-duration-medium4: .4s;--md-sys-motion-duration-long1: .45s;--md-sys-motion-duration-long2: .5s;--md-sys-motion-easing-emphasized: cubic-bezier(.2, 0, 0, 1);--md-sys-motion-easing-emphasized-decelerate: cubic-bezier(.05, .7, .1, 1);--md-sys-motion-easing-emphasized-accelerate: cubic-bezier(.3, 0, .8, .15);--md-sys-motion-easing-standard: cubic-bezier(.2, 0, 0, 1);--md-sys-motion-easing-standard-decelerate: cubic-bezier(0, 0, 0, 1);--md-sys-motion-easing-standard-accelerate: cubic-bezier(.3, 0, 1, 1);--md-sys-typescale-font-family: "Nunito", "Inter", -apple-system, BlinkMacSystemFont, sans-serif;--md-sys-typescale-display-large: 700 57px/64px var(--md-sys-typescale-font-family);--md-sys-typescale-display-medium: 700 45px/52px var(--md-sys-typescale-font-family);--md-sys-typescale-display-small: 700 36px/44px var(--md-sys-typescale-font-family);--md-sys-typescale-headline-large: 700 32px/40px var(--md-sys-typescale-font-family);--md-sys-typescale-headline-medium: 700 28px/36px var(--md-sys-typescale-font-family);--md-sys-typescale-headline-small: 600 24px/32px var(--md-sys-typescale-font-family);--md-sys-typescale-title-large: 600 22px/28px var(--md-sys-typescale-font-family);--md-sys-typescale-title-medium: 600 16px/24px var(--md-sys-typescale-font-family);--md-sys-typescale-title-small: 600 14px/20px var(--md-sys-typescale-font-family);--md-sys-typescale-body-large: 400 16px/24px var(--md-sys-typescale-font-family);--md-sys-typescale-body-medium: 400 14px/20px var(--md-sys-typescale-font-family);--md-sys-typescale-body-small: 400 12px/16px var(--md-sys-typescale-font-family);--md-sys-typescale-label-large: 600 14px/20px var(--md-sys-typescale-font-family);--md-sys-typescale-label-medium: 600 12px/16px var(--md-sys-typescale-font-family);--md-sys-typescale-label-small: 600 11px/16px var(--md-sys-typescale-font-family)}#root{width:100%;min-height:100vh;min-height:100dvh}.word-card{perspective:1000px;height:200px;cursor:pointer}.word-card-inner{position:relative;width:100%;height:100%;transition:transform var(--md-sys-motion-duration-medium4) var(--md-sys-motion-easing-emphasized);transform-style:preserve-3d}.word-card.flipped .word-card-inner{transform:rotateY(180deg)}.word-card-front,.word-card-back{position:absolute;width:100%;height:100%;backface-visibility:hidden;border-radius:var(--md-sys-shape-corner-large);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px;box-shadow:var(--md-sys-elevation-2);transition:box-shadow var(--md-sys-motion-duration-short3) var(--md-sys-motion-easing-standard)}.word-card:hover .word-card-front,.word-card:hover .word-card-back{box-shadow:var(--md-sys-elevation-3)}.word-card-front{background:var(--md-sys-color-surface-container-low)}.word-card-back{background:var(--md-sys-color-primary-container);transform:rotateY(180deg);color:var(--md-sys-color-on-primary-container)}.word-text{font:var(--md-sys-typescale-headline-medium);color:var(--md-sys-color-primary);margin-bottom:4px;text-align:center;letter-spacing:-.02em}.word-phonetic{font:var(--md-sys-typescale-body-medium);color:var(--md-sys-color-on-surface-variant);font-style:italic;margin-bottom:20px}.speak-btn{display:flex;align-items:center;justify-content:center;width:52px;height:52px;background:var(--md-sys-color-primary);border:none;border-radius:var(--md-sys-shape-corner-full);color:var(--md-sys-color-on-primary);font-size:22px;cursor:pointer;box-shadow:var(--md-sys-elevation-1);transition:transform var(--md-sys-motion-duration-short3) var(--md-sys-motion-easing-standard),box-shadow var(--md-sys-motion-duration-short3) var(--md-sys-motion-easing-standard)}.speak-btn:hover{box-shadow:var(--md-sys-elevation-2)}.speak-btn:active{transform:scale(.95)}.speak-btn.loading{animation:subtle-pulse 1.2s ease-in-out infinite}@keyframes subtle-pulse{0%,to{opacity:1}50%{opacity:.7}}.tap-hint{position:absolute;bottom:16px;font:var(--md-sys-typescale-label-small);color:var(--md-sys-color-outline)}.word-definition{font:var(--md-sys-typescale-title-medium);text-align:center;margin-bottom:8px;color:var(--md-sys-color-on-primary-container)}.word-example{font:var(--md-sys-typescale-body-small);font-style:italic;text-align:center;opacity:.85;line-height:1.5;color:var(--md-sys-color-on-primary-container)}.word-part-of-speech{position:absolute;top:16px;right:16px;font:var(--md-sys-typescale-label-small);background:#00000014;padding:4px 10px;border-radius:var(--md-sys-shape-corner-full);text-transform:uppercase;letter-spacing:.5px;color:var(--md-sys-color-on-primary-container)}.card-actions{display:flex;gap:12px;margin-top:20px}.action-btn{display:flex;align-items:center;gap:6px;padding:10px 16px;border:1px solid var(--md-sys-color-outline);border-radius:var(--md-sys-shape-corner-full);background:transparent;font:var(--md-sys-typescale-label-large);cursor:pointer;transition:background var(--md-sys-motion-duration-short3) var(--md-sys-motion-easing-standard),border-color var(--md-sys-motion-duration-short3) var(--md-sys-motion-easing-standard),transform var(--md-sys-motion-duration-short2) var(--md-sys-motion-easing-standard)}.action-btn:active{transform:scale(.97)}.action-btn.known{background:var(--md-sys-color-success);border-color:var(--md-sys-color-success);color:var(--md-sys-color-on-success)}.action-btn.known:hover{opacity:.9}.action-btn.learning{background:var(--md-sys-color-secondary-container);border-color:var(--md-sys-color-secondary-container);color:var(--md-sys-color-on-secondary-container)}.action-btn.learning:hover{opacity:.9}@media(max-width:380px){.word-card{height:180px}.word-text{font:var(--md-sys-typescale-headline-small)}.speak-btn{width:44px;height:44px;font-size:18px}.card-actions{gap:8px}.action-btn{padding:8px 12px;font:var(--md-sys-typescale-label-medium)}}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-tap-highlight-color:transparent}body{font:var(--md-sys-typescale-body-large);background-color:var(--md-sys-color-surface);min-height:100vh;min-height:100dvh;color:var(--md-sys-color-on-surface);-webkit-font-smoothing:antialiased}.app-container{max-width:480px;margin:0 auto;padding:16px;min-height:100vh;min-height:100dvh}.app-header{text-align:center;margin-bottom:24px;padding:20px 0 16px}.header-content{display:flex;align-items:center;justify-content:center;gap:12px}.app-title{font:var(--md-sys-typescale-title-large);color:var(--md-sys-color-on-surface);letter-spacing:-.02em}.streak-badge{display:flex;align-items:center;gap:4px;background:var(--md-sys-color-primary-container);padding:6px 12px;border-radius:var(--md-sys-shape-corner-full);color:var(--md-sys-color-on-primary-container)}.streak-icon{font-size:14px}.streak-count{font:var(--md-sys-typescale-label-large)}.date-display{font:var(--md-sys-typescale-body-medium);color:var(--md-sys-color-on-surface-variant);margin-top:8px}.subtitle{font:var(--md-sys-typescale-body-small);color:var(--md-sys-color-outline);margin-top:4px}.progress-section{margin-bottom:24px}.progress-bar-container{height:4px;background:var(--md-sys-color-surface-container-highest);border-radius:var(--md-sys-shape-corner-full);overflow:hidden;margin-bottom:12px}.progress-bar{height:100%;background:var(--md-sys-color-primary);border-radius:var(--md-sys-shape-corner-full);transition:width var(--md-sys-motion-duration-medium2) var(--md-sys-motion-easing-emphasized)}.progress-text{text-align:center;font:var(--md-sys-typescale-label-medium);color:var(--md-sys-color-on-surface-variant)}.loading-container{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:64px 24px;gap:16px}.loading-spinner{width:40px;height:40px;border:3px solid var(--md-sys-color-surface-container-highest);border-top-color:var(--md-sys-color-primary);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading-text{font:var(--md-sys-typescale-body-medium);color:var(--md-sys-color-on-surface)}.loading-hint{font:var(--md-sys-typescale-body-small);color:var(--md-sys-color-outline)}.cards-container{display:flex;flex-direction:column;gap:16px;padding-bottom:48px}.tts-status{position:fixed;bottom:24px;left:50%;transform:translate(-50%);background:var(--md-sys-color-surface-container-high);box-shadow:var(--md-sys-elevation-3);padding:12px 24px;border-radius:var(--md-sys-shape-corner-large);z-index:100;display:flex;align-items:center;gap:8px;color:var(--md-sys-color-on-surface);font:var(--md-sys-typescale-label-large)}.tts-icon{opacity:.7;animation:subtle-pulse 1.5s ease-in-out infinite}@keyframes subtle-pulse{0%,to{opacity:.7}50%{opacity:1}}.empty-state{text-align:center;padding:48px 24px;background:var(--md-sys-color-surface-container-low);border-radius:var(--md-sys-shape-corner-extra-large);box-shadow:var(--md-sys-elevation-1)}.empty-icon{font-size:48px;margin-bottom:16px;opacity:.8}.empty-state h2{font:var(--md-sys-typescale-headline-small);color:var(--md-sys-color-on-surface);margin-bottom:8px}.empty-state p{font:var(--md-sys-typescale-body-medium);color:var(--md-sys-color-on-surface-variant);margin-bottom:24px}.btn-primary{display:inline-flex;align-items:center;justify-content:center;padding:12px 24px;background:var(--md-sys-color-primary);color:var(--md-sys-color-on-primary);border:none;border-radius:var(--md-sys-shape-corner-full);font:var(--md-sys-typescale-label-large);cursor:pointer;box-shadow:var(--md-sys-elevation-1);transition:transform var(--md-sys-motion-duration-short3) var(--md-sys-motion-easing-standard),box-shadow var(--md-sys-motion-duration-short3) var(--md-sys-motion-easing-standard),background var(--md-sys-motion-duration-short3) var(--md-sys-motion-easing-standard)}.btn-primary:hover{box-shadow:var(--md-sys-elevation-2)}.btn-primary:active{transform:scale(.98)}@supports (padding-top: env(safe-area-inset-top)){.app-container{padding-top:calc(16px + env(safe-area-inset-top));padding-bottom:calc(16px + env(safe-area-inset-bottom))}}@media(min-width:768px){.app-container{padding:32px}}.offline-banner{position:fixed;top:0;left:0;right:0;background:var(--md-sys-color-secondary-container);color:var(--md-sys-color-on-secondary-container);padding:10px 16px;text-align:center;font:var(--md-sys-typescale-label-medium);z-index:1000;display:flex;align-items:center;justify-content:center;gap:8px;animation:slideDown var(--md-sys-motion-duration-medium2) var(--md-sys-motion-easing-emphasized-decelerate)}.offline-icon{font-size:14px;opacity:.8}@keyframes slideDown{0%{transform:translateY(-100%)}to{transform:translateY(0)}}.loading-progress-bar{width:160px;height:4px;background:var(--md-sys-color-surface-container-highest);border-radius:var(--md-sys-shape-corner-full);overflow:hidden;margin-top:12px}.loading-progress-fill{height:100%;background:var(--md-sys-color-primary);border-radius:var(--md-sys-shape-corner-full);transition:width var(--md-sys-motion-duration-short4) var(--md-sys-motion-easing-standard)}.error-container{text-align:center;padding:48px 24px;background:var(--md-sys-color-surface-container-low);border-radius:var(--md-sys-shape-corner-extra-large);box-shadow:var(--md-sys-elevation-1)}.error-icon{font-size:40px;margin-bottom:16px;opacity:.7}.error-container h2{font:var(--md-sys-typescale-title-large);color:var(--md-sys-color-error);margin-bottom:8px}.error-container p{font:var(--md-sys-typescale-body-medium);color:var(--md-sys-color-on-surface-variant);margin-bottom:24px}.cache-indicator{display:inline-flex;align-items:center;gap:4px}.source-badge{display:inline-flex;align-items:center;margin-left:8px;padding:2px 8px;border-radius:var(--md-sys-shape-corner-full);font:var(--md-sys-typescale-label-small)}.source-badge.cached{background:var(--md-sys-color-tertiary-container);color:var(--md-sys-color-on-tertiary-container)}.source-badge.local{background:var(--md-sys-color-secondary-container);color:var(--md-sys-color-on-secondary-container)}.complete-stats{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-bottom:24px}.complete-stats span{display:inline-flex;align-items:center;gap:4px;background:var(--md-sys-color-surface-container);padding:6px 12px;border-radius:var(--md-sys-shape-corner-full);font:var(--md-sys-typescale-label-medium);color:var(--md-sys-color-on-surface-variant)}