:root{--bg-color: #050507;--surface-color: rgba(255, 255, 255, .03);--surface-hover: rgba(255, 255, 255, .08);--border-color: rgba(255, 255, 255, .1);--text-primary: #f0f0f5;--text-secondary: #a0a0b0;--accent-primary: #00f2ff;--accent-secondary: #7000ff;--accent-magenta: #ff00ea;--sidebar-width: 280px;--glass-blur: 16px;--transition-fast: .2s cubic-bezier(.4, 0, .2, 1);--transition-slow: .5s cubic-bezier(.4, 0, .2, 1)}:root.light-mode{--bg-color: #fcf8e8;--surface-color: rgba(67, 52, 34, .05);--surface-hover: rgba(67, 52, 34, .08);--border-color: rgba(67, 52, 34, .15);--text-primary: #3d3021;--text-secondary: #6e5b4b;--accent-primary: #b08d57;--accent-secondary: #7d6b5d;--accent-magenta: #a64d4d;--glass-blur: 8px}:root.light-mode #app{background-image:radial-gradient(circle at 10% 10%,rgba(176,141,87,.1) 0%,transparent 40%),radial-gradient(circle at 90% 90%,rgba(110,91,75,.1) 0%,transparent 40%)}:root.light-mode .sidebar{background:#fcf8e8e6}:root.light-mode .nav-item.active{background:#b08d5726;color:var(--text-primary);border-color:var(--accent-primary)}:root.light-mode .concept-card{box-shadow:0 10px 30px #4334220d}:root.light-mode .welcome-card h2{background:none;-webkit-background-clip:unset;background-clip:unset;-webkit-text-fill-color:var(--text-primary);color:var(--text-primary)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,sans-serif;background-color:var(--bg-color);color:var(--text-primary);overflow:hidden;height:100vh;width:100vw}body.sidebar-open{overflow:hidden}h1,h2,h3{font-family:Outfit,sans-serif;font-weight:800}#constellation-bg{position:fixed;top:0;left:0;width:100vw;height:100vh;z-index:0;pointer-events:none}#app{position:relative;z-index:1;display:flex;height:100vh;width:100vw;background-image:radial-gradient(circle at 10% 10%,rgba(112,0,255,.15) 0%,transparent 40%),radial-gradient(circle at 90% 90%,rgba(0,242,255,.15) 0%,transparent 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1rem;margin-bottom:.5rem;border-radius:12px;cursor:pointer;transition:var(--transition-fast);color:var(--text-secondary);font-weight:500;border:1px solid transparent}.nav-item:hover{background:var(--surface-hover);color:var(--text-primary);border-color:var(--border-color);transform:translate(4px)}.nav-item.active{background:#00f2ff1a;color:var(--accent-primary);border-color:#00f2ff4d}.main-content{flex:1;display:flex;flex-direction:column;height:100%;overflow:hidden}.top-bar{height:70px;padding:0 2rem;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border-color)}.sidebar-toggle-btn{background:var(--surface-color);border:1px solid 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1.25rem;background:var(--surface-color);border:1px solid var(--border-color);border-radius:12px;color:var(--text-primary);font-family:inherit;font-size:.9rem;outline:none;transition:var(--transition-fast)}#concept-search:focus{border-color:var(--accent-primary);background:var(--surface-hover);box-shadow:0 0 20px #00f2ff1a}.content-area{flex:1;padding:2rem;overflow-y:auto;display:flex;flex-direction:column;gap:2rem}.welcome-card{padding:3rem;background:var(--surface-color);border:1px solid var(--border-color);border-radius:24px;text-align:center;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.welcome-card h2{font-size:2.5rem;margin-bottom:1rem;background:linear-gradient(135deg,white,var(--text-secondary));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.welcome-card p{color:var(--text-secondary);font-size:1.1rem}.concept-card{background:var(--surface-color);border:1px solid 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tickerScroll{0%{transform:translate(var(--start-x, 100vw))}to{transform:translate(-100%)}}:root.light-mode .cotd-ticker{border-color:var(--accent-primary);box-shadow:0 0 20px #b08d571f}:root.light-mode .cotd-ticker:hover{box-shadow:0 0 30px #b08d5740}:root.light-mode .cotd-label{color:var(--accent-primary)}@media(max-width:1024px){:root{--sidebar-width: 220px}.welcome-card{padding:2rem}.welcome-card h2{font-size:2rem}.concept-title{font-size:1.6rem}.content-area{padding:1.5rem}.top-bar{padding:0 1.25rem}}@media(max-width:640px){:root{--sidebar-width: 80vw}#app{flex-direction:column;overflow:hidden}.sidebar{position:fixed;top:0;left:0;height:100%;width:var(--sidebar-width)!important;transform:translate(-100%);transition:transform .3s cubic-bezier(.4,0,.2,1);z-index:100;border-right:1px solid var(--border-color)}#app.sidebar-open 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1rem}.cotd-label{font-size:.7rem}.ticker-text{font-size:.95rem}.sidebar-header{padding:1.25rem 1.5rem}}.study-mode-btn{background:var(--surface-color);border:1px solid var(--border-color);width:40px;height:40px;border-radius:10px;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1.2rem;transition:var(--transition-fast)}.study-mode-btn:hover{background:var(--surface-hover);border-color:var(--accent-primary);transform:translateY(-2px)}:root.light-mode .study-mode-btn:hover{border-color:var(--accent-primary)}.lock-btn{width:40px;height:40px;border-radius:10px;background:var(--surface-color);border:1px solid 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.study-mode-overlay{background:#fcf8e8fa}.zen-flow-canvas{position:absolute;top:0;left:0;width:100%;height:100%;z-index:-1}.study-container{width:100%;max-width:600px;height:100vh;display:flex;flex-direction:column;padding:2rem;animation:studyFadeIn .6s ease-out}@keyframes studyFadeIn{0%{opacity:0;transform:scale(.95) translateY(20px)}to{opacity:1;transform:scale(1) translateY(0)}}.study-header{display:flex;align-items:center;justify-content:space-between;padding:1rem 0 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#00f2ff40;transform:translateY(-2px)}.mini-timer-icon{font-size:1rem;flex-shrink:0}.mini-timer-display{font-family:Outfit,sans-serif;font-weight:700;font-size:1rem;color:var(--text-primary);letter-spacing:.05em;font-variant-numeric:tabular-nums;white-space:nowrap}.mini-timer-bar{position:absolute;bottom:0;left:0;width:100%;height:2px;background:#ffffff14}.mini-timer-progress{height:100%;width:100%;background:linear-gradient(90deg,var(--accent-primary),var(--accent-secondary));border-radius:100px;transition:width 1s linear}.mini-stop-btn{width:28px;height:28px;border-radius:50%;background:var(--surface-color);border:1px solid var(--border-color);color:var(--text-secondary);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:.75rem;transition:var(--transition-fast);flex-shrink:0}.mini-stop-btn:hover{background:#ff505026;border-color:#ff505099;color:#ff5050}:root.light-mode .mini-timer-inner{box-shadow:0 4px 24px #b08d5733,0 0 0 1px #b08d5726}:root.light-mode .mini-timer-inner:hover{box-shadow:0 6px 32px #b08d574d}:root.light-mode .mini-timer-bar{background:#0000000f}.study-content{flex:1;display:flex;flex-direction:column;justify-content:center;overflow:hidden}.study-view{display:none;flex-direction:column;align-items:center;gap:2rem;animation:viewFadeIn .4s ease-out}.study-view.active{display:flex}@keyframes viewFadeIn{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}.timer-wrapper{position:relative;display:flex;flex-direction:column;align-items:center;gap:1.5rem}.breathing-ring{position:absolute;width:360px;height:360px;border-radius:50%;background:radial-gradient(circle,var(--accent-primary) 0%,transparent 70%);opacity:0;animation:breathe 4s ease-in-out infinite paused}.timer-wrapper.active .breathing-ring{animation-play-state:running;opacity:.15}@keyframes breathe{0%,to{transform:scale(.9);opacity:.1}50%{transform:scale(1.1);opacity:.2}}.timer-ring{position:relative;width:280px;height:280px}.timer-ring svg{width:100%;height:100%;transform:rotate(-90deg)}.timer-track{fill:none;stroke:var(--surface-color);stroke-width:8}.timer-progress{fill:none;stroke:var(--accent-primary);stroke-width:8;stroke-linecap:round;stroke-dasharray:817;stroke-dashoffset:0;transition:stroke-dashoffset 1s linear}:root.light-mode .timer-progress{stroke:var(--accent-primary)}.timer-display{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);display:flex;align-items:center;gap:.25rem}.timer-digits{font-family:Outfit,sans-serif;font-weight:800;font-size:5.5rem;background:linear-gradient(135deg,var(--text-primary),var(--text-secondary));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;font-variant-numeric:tabular-nums}.timer-sep{font-family:Outfit,sans-serif;font-weight:800;font-size:5.5rem;color:var(--text-secondary);animation:pulse 1s ease-in-out infinite paused}.timer-wrapper.active .timer-sep{animation-play-state:running}@keyframes pulse{0%,to{opacity:1}50%{opacity:.3}}.timer-status{font-family:Inter,sans-serif;font-weight:400;font-size:1rem;color:var(--text-secondary);letter-spacing:.05em}.timer-actions{display:flex;gap:1rem}.primary-btn,.secondary-btn{padding:1rem 2.5rem;border-radius:16px;font-family:Inter,sans-serif;font-weight:600;font-size:1rem;cursor:pointer;transition:var(--transition-fast);border:none}.primary-btn{background:linear-gradient(135deg,var(--accent-primary),var(--accent-secondary));color:#000;box-shadow:0 4px 20px #00f2ff4d}.primary-btn:hover{transform:translateY(-2px);box-shadow:0 6px 30px #00f2ff66}:root.light-mode .primary-btn{background:linear-gradient(135deg,var(--accent-primary),#8b7355);color:#fff;box-shadow:0 4px 20px #b08d574d}:root.light-mode .primary-btn:hover{box-shadow:0 6px 30px #b08d5766}.secondary-btn{background:var(--surface-color);border:1px solid var(--border-color);color:var(--text-primary)}.secondary-btn:hover{background:var(--surface-hover);border-color:var(--accent-primary)}.timer-presets{display:flex;gap:.75rem}.preset-btn{padding:.6rem 1.2rem;border-radius:12px;background:var(--surface-color);border:1px solid var(--border-color);color:var(--text-secondary);font-family:Inter,sans-serif;font-weight:500;font-size:.9rem;cursor:pointer;transition:var(--transition-fast)}.preset-btn:hover{background:var(--surface-hover)}.preset-btn.active{background:#00f2ff26;border-color:var(--accent-primary);color:var(--accent-primary)}:root.light-mode .preset-btn.active{background:#b08d5726;color:var(--accent-primary)}.flashcard-scene{perspective:1000px;width:100%;max-width:400px;height:280px;margin-bottom:1.5rem}.flashcard{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.4,0,.2,1);cursor:pointer}.flashcard.flipped{transform:rotateY(180deg)}.flashcard-face{position:absolute;width:100%;height:100%;backface-visibility:hidden;border-radius:24px;background:var(--surface-color);border:1px solid var(--border-color);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem;box-shadow:0 10px 40px #0000001a}:root.light-mode .flashcard-face{box-shadow:0 10px 40px #43342214}.flashcard-back{transform:rotateY(180deg);background:linear-gradient(135deg,var(--surface-color),var(--surface-hover))}.card-badge{position:absolute;top:1.5rem;padding:.4rem 1rem;background:#00f2ff1a;border-radius:20px;font-family:Inter,sans-serif;font-weight:600;font-size:.75rem;color:var(--accent-primary);letter-spacing:.1em;text-transform:uppercase}:root.light-mode .card-badge{background:#b08d5726;color:var(--accent-primary)}.card-concept{font-family:Outfit,sans-serif;font-weight:800;font-size:1.8rem;text-align:center;background:linear-gradient(135deg,var(--text-primary),var(--text-secondary));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:1rem}.card-hint{color:var(--text-secondary);font-size:.9rem;opacity:.6}.card-description{text-align:center;line-height:1.7;color:var(--text-primary);font-size:1rem;max-width:320px}.flashcard-progress{width:100%;max-width:400px;text-align:center;margin-bottom:1.5rem}.progress-label{display:block;font-family:Inter,sans-serif;font-weight:500;font-size:.9rem;color:var(--text-secondary);margin-bottom:.75rem}.progress-track{width:100%;height:6px;background:var(--surface-color);border-radius:3px;overflow:hidden}.progress-bar{height:100%;background:linear-gradient(90deg,var(--accent-primary),var(--accent-secondary));border-radius:3px;transition:width .3s ease}.flashcard-actions{display:flex;gap:1rem;align-items:center}.nav-btn{width:44px;height:44px;border-radius:12px;background:var(--surface-color);border:1px solid var(--border-color);color:var(--text-primary);font-size:1.2rem;cursor:pointer;transition:var(--transition-fast);display:flex;align-items:center;justify-content:center}.nav-btn:hover{background:var(--surface-hover);border-color:var(--accent-primary);transform:scale(1.05)}.action-btn{padding:1rem 1.8rem;border-radius:14px;font-family:Inter,sans-serif;font-weight:600;font-size:.95rem;cursor:pointer;transition:var(--transition-fast);border:none}.action-btn.known{background:linear-gradient(135deg,#00d4aa,#00a88a);color:#000}.action-btn.known:hover{transform:translateY(-2px);box-shadow:0 4px 20px #00d4aa4d}.action-btn.review{background:var(--surface-color);border:1px solid var(--border-color);color:var(--text-primary)}.action-btn.review:hover{background:var(--surface-hover);border-color:var(--accent-magenta);color:var(--accent-magenta)}.study-footer{display:flex;justify-content:center;gap:1rem;padding:1.5rem 0}.view-switch{display:flex;align-items:center;gap:.5rem;padding:.75rem 1.5rem;border-radius:14px;background:var(--surface-color);border:1px solid var(--border-color);color:var(--text-secondary);font-family:Inter,sans-serif;font-weight:500;font-size:.9rem;cursor:pointer;transition:var(--transition-fast)}.view-switch:hover{background:var(--surface-hover)}.view-switch.active{background:#00f2ff26;border-color:var(--accent-primary);color:var(--accent-primary)}:root.light-mode .view-switch.active{background:#b08d5726;color:var(--accent-primary)}.view-icon{font-size:1.1rem}@media(max-width:640px){.study-container{padding:1rem}.study-header{padding:.5rem 0 1rem;flex-wrap:wrap;gap:.75rem}.study-logo{font-size:1rem}.study-metrics{gap:.75rem}.metric-item{font-size:.8rem}.timer-ring{width:180px;height:180px}.timer-digits,.timer-sep{font-size:2.5rem}.breathing-ring{width:220px;height:220px}.primary-btn,.secondary-btn{padding:.85rem 2rem;font-size:.9rem}.timer-presets{flex-wrap:wrap;justify-content:center}.preset-btn{padding:.5rem 1rem;font-size:.85rem}.flashcard-scene{height:240px}.card-concept{font-size:1.4rem}.card-description{font-size:.9rem}.flashcard-actions{flex-wrap:wrap;justify-content:center}.action-btn{padding:.85rem 1.5rem;font-size:.85rem}.view-switch{padding:.6rem 1rem;font-size:.85rem}}.hidden{display:none!important}