body.dark{--bg-color: #0f1115;--text-main: #f3f4f6;--text-sub: #8b949e;--card-bg: #16191f;--card-border: #30363d;--card-shadow: 0 16px 32px rgba(0, 0, 0, .4);--primary-accent: #3b82f6;--input-bg: #0d0f12;--input-border: #30363d;--tag-bg: #21262d;--tag-text: #c9d1d9;--tag-active-bg: #f3f4f6;--tag-active-text: #0f1115;--nav-bg: rgba(15, 17, 21, .85)}body.light{--bg-color: #f6f8fa;--text-main: #1f2328;--text-sub: #656d76;--card-bg: #ffffff;--card-border: #d0d7de;--card-shadow: 0 16px 32px rgba(0, 0, 0, .08);--primary-accent: #0969da;--input-bg: #ffffff;--input-border: #d0d7de;--tag-bg: #f3f4f6;--tag-text: #59636e;--tag-active-bg: #1f2328;--tag-active-text: #ffffff;--nav-bg: rgba(246, 248, 250, .85)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Outfit,Noto Sans TC,system-ui,-apple-system,sans-serif;background-color:var(--bg-color);color:var(--text-main);min-height:100vh;overflow-x:hidden;transition:background-color .2s ease,color .2s ease}.app-container{max-width:1080px;margin:0 auto;padding:0 24px 60px}.site-nav{position:sticky;top:0;z-index:50;display:flex;justify-content:space-between;align-items:center;padding:16px 0;border-bottom:1px solid var(--card-border);margin-bottom:60px;background-color:var(--nav-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}.nav-brand{display:flex;align-items:center;gap:10px}.brand-text{font-size:1.2rem;font-weight:700;letter-spacing:.5px;color:var(--text-main)}.theme-toggle-btn{display:flex;align-items:center;justify-content:center;width:36px;height:36px;background:var(--tag-bg);border:1px solid var(--card-border);color:var(--text-main);border-radius:8px;cursor:pointer;transition:all .2s ease}.site-header{text-align:center;margin-bottom:60px}.site-title{font-size:2.6rem;font-weight:800;letter-spacing:-.5px;line-height:1.3;margin-bottom:16px;color:var(--text-main)}.site-title .accent-text{color:var(--primary-accent)}.site-desc{font-size:1.05rem;color:var(--text-sub);max-width:550px;margin:0 auto;line-height:1.6}.control-panel{display:flex;flex-direction:column;align-items:center;gap:20px;margin-bottom:50px}.search-bar-wrapper{position:relative;width:100%;max-width:550px}.search-icon{position:absolute;left:18px;top:50%;transform:translateY(-50%);color:var(--text-sub)}.search-input{width:100%;padding:14px 45px;font-size:1rem;background-color:var(--input-bg);border:1px solid var(--input-border);color:var(--text-main);border-radius:12px;outline:none;transition:all .2s ease}.search-input:focus{border-color:var(--primary-accent);box-shadow:0 0 0 2px #3b82f64d}.tag-chips-wrapper{display:flex;flex-wrap:wrap;justify-content:center;gap:8px}.tag-chip{background-color:var(--tag-bg);border:1px solid var(--card-border);color:var(--tag-text);padding:8px 16px;border-radius:20px;cursor:pointer;font-size:.85rem;font-weight:600;transition:all .2s ease}.tag-chip:hover{border-color:var(--text-sub);transform:translateY(-1px)}.tag-chip.active{background-color:var(--tag-active-bg);color:var(--tag-active-text);border-color:transparent}.mobile-tag-select{display:none;width:100%;max-width:550px;position:relative}.tag-select-input{width:100%;padding:12px 40px 12px 16px;font-size:1rem;font-weight:600;background-color:var(--input-bg);border:1px solid var(--input-border);color:var(--text-main);border-radius:12px;-moz-appearance:none;appearance:none;-webkit-appearance:none;outline:none;cursor:pointer}.select-arrow{position:absolute;right:16px;top:50%;transform:translateY(-50%);color:var(--text-sub);font-size:.8rem;pointer-events:none}.resource-tabs-container{display:flex;gap:12px;margin-bottom:40px;border-bottom:1px solid var(--card-border);padding-bottom:16px;overflow-x:auto}.tab{padding:8px 18px;border-radius:8px;font-weight:600;font-size:.95rem;cursor:pointer;border:none;background:transparent;transition:all .2s ease;white-space:nowrap;color:var(--text-sub)}.tab.active{background-color:var(--text-main);color:var(--bg-color)}.category-title{font-size:1.2rem;font-weight:700;color:var(--text-main);margin-bottom:20px;display:flex;align-items:center;border-left:4px solid var(--primary-accent);padding-left:12px}.item-count-badge{font-size:.8rem;background:var(--tag-bg);color:var(--text-sub);padding:2px 10px;border-radius:12px;margin-left:auto;font-weight:500}.projects-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:28px;margin-bottom:60px}.immersive-card{text-decoration:none;color:inherit;background-color:var(--card-bg);border:1px solid var(--card-border);border-radius:20px;overflow:hidden;display:flex;flex-direction:column;transition:transform .3s cubic-bezier(.2,.8,.2,1),box-shadow .3s ease;cursor:pointer}.immersive-card:hover{transform:translateY(-6px) scale(1.01);border-color:var(--text-sub);box-shadow:var(--card-shadow)}.immersive-card:active{transform:scale(.98)}.card-cover{height:160px;position:relative;display:flex;align-items:center;justify-content:center;overflow:hidden}.cover-physics{background:linear-gradient(135deg,#059669,#064e3b)}.cover-math{background:linear-gradient(135deg,#2563eb,#1e3a8a)}.cover-earth{background:linear-gradient(135deg,#d97706,#78350f)}.cover-tool{background:linear-gradient(135deg,#7c3aed,#4c1d95)}.cover-default{background:linear-gradient(135deg,#4b5563,#1f2937)}.cover-watermark{font-size:3.5rem;font-weight:900;color:#ffffff14;letter-spacing:6px;transform:rotate(-5deg) scale(1.2);-webkit-user-select:none;user-select:none;font-family:Outfit,sans-serif}.cover-glass-badge{position:absolute;top:16px;left:16px;background:#0000004d;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);color:#fff;padding:6px 14px;border-radius:20px;font-size:.8rem;font-weight:700;border:1px solid rgba(255,255,255,.15);box-shadow:0 4px 12px #0000001a;z-index:2}.card-img{width:100%;height:100%;object-fit:cover}.card-content{padding:20px;flex-grow:1;display:flex;flex-direction:column}.card-title{font-size:1.25rem;font-weight:800;margin-bottom:8px;color:var(--text-main);line-height:1.3}.card-desc{font-size:.95rem;color:var(--text-sub);margin-bottom:16px;line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:auto}.tag{font-size:.8rem;color:var(--text-sub);font-weight:500}.site-footer{text-align:center;padding:50px 0;border-top:1px solid var(--card-border);color:var(--text-sub);margin-top:20px}.footer-links a{color:var(--text-sub);text-decoration:none;font-size:.95rem;font-weight:500}@media screen and (max-width:768px){.app-container{padding:0 16px 40px}.site-title{font-size:1.8rem;margin-bottom:12px}.site-desc{font-size:.95rem;padding:0 10px}.desktop-only{display:none!important}.mobile-tag-select{display:block}.resource-tabs-container{display:flex;justify-content:space-between;gap:8px;padding-bottom:12px}.tab{flex:1;padding:12px 4px;text-align:center}.projects-grid{grid-template-columns:1fr;gap:12px}.immersive-card{flex-direction:row;align-items:stretch;height:100px;border-radius:12px}.card-cover{width:100px;height:100%;flex-shrink:0;border-right:1px solid var(--card-border)}.cover-glass-badge{display:none}.cover-watermark{font-size:1.5rem;letter-spacing:2px;transform:rotate(-15deg)}.card-content{padding:10px 14px;display:flex;flex-direction:column;justify-content:center;overflow:hidden}.card-title{font-size:1.05rem;margin-bottom:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.card-desc{font-size:.85rem;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden}.tags{gap:6px;margin-top:auto}.tag{font-size:.75rem;color:var(--text-sub)}}.flashcard-container{max-width:600px;margin:0 auto;padding:40px 20px;display:flex;flex-direction:column;align-items:center}.flashcard-header{width:100%;display:flex;justify-content:space-between;align-items:center;margin-bottom:24px;font-size:.9rem;font-weight:600;color:var(--text-sub)}.flashcard-deck-tag{background-color:var(--tag-bg);padding:4px 10px;border-radius:4px;border:1px solid var(--card-border)}.flashcard-scene{width:100%;height:350px;perspective:1200px;cursor:pointer;margin-bottom:30px}.flashcard-inner{width:100%;height:100%;position:relative;transition:transform .5s cubic-bezier(.4,.2,.2,1);transform-style:preserve-3d}.flashcard-inner.is-flipped{transform:rotateY(180deg)}.flashcard-face{position:absolute;width:100%;height:100%;backface-visibility:hidden;background-color:var(--card-bg);border:1px solid var(--card-border);border-radius:16px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px;text-align:center;box-shadow:var(--card-shadow)}.flashcard-back{transform:rotateY(180deg);background-color:var(--input-bg)}.face-label{position:absolute;top:24px;left:24px;font-size:.75rem;font-weight:800;letter-spacing:2px;color:var(--text-sub);opacity:.6}.card-content{font-size:1.6rem;font-weight:700;color:var(--text-main);line-height:1.5;white-space:pre-wrap}.card-content.accent{color:var(--primary-accent);font-size:2rem}.flip-hint{position:absolute;bottom:24px;font-size:.85rem;color:var(--text-sub);opacity:.5}.flashcard-actions{display:flex;gap:16px;width:100%;transition:opacity .3s ease,transform .3s ease}.flashcard-actions.hidden{opacity:0;pointer-events:none;transform:translateY(10px)}.flashcard-actions.visible{opacity:1;pointer-events:auto;transform:translateY(0)}.btn-flashcard{flex:1;padding:14px;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;background-color:transparent;border:1px solid var(--card-border);color:var(--text-main);transition:all .2s ease}.btn-flashcard.danger:hover{border-color:#ef4444;color:#ef4444;background-color:#ef44440d}.btn-flashcard.warning:hover{border-color:#f59e0b;color:#f59e0b;background-color:#f59e0b0d}.btn-flashcard.success:hover{border-color:#10b981;color:#10b981;background-color:#10b9810d}.btn-flashcard.outline:hover{background-color:var(--tag-bg)}.flashcard-end-screen{text-align:center;padding:60px 20px;background-color:var(--card-bg);border:1px solid var(--card-border);border-radius:16px;width:100%}.flashcard-end-screen .end-icon{font-size:3rem;display:block;margin-bottom:20px}.flashcard-end-screen h2{margin-bottom:12px;color:var(--text-main)}.flashcard-end-screen p{color:var(--text-sub);margin-bottom:24px}@media screen and (max-width:768px){.flashcard-container{padding:20px 16px}div[style*=gridTemplateColumns]{grid-template-columns:repeat(2,1fr)!important;gap:8px!important}.flashcard-container .btn-flashcard{padding:12px 6px!important;font-size:.85rem!important}.flashcard-scene{height:280px;margin-bottom:20px}.flashcard-face{padding:24px 16px}.card-content{font-size:1.2rem}.card-content.accent{font-size:1.5rem}.flashcard-actions{gap:8px}.flashcard-actions .btn-flashcard{padding:12px 4px;font-size:.9rem}}