*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --p1:#2D0E8A;--p2:#5B21B6;--p3:#7C3AED;--p4:#A78BFA;--p5:#DDD6FE;--p6:#EDE9FE;--p7:#F5F3FF;
  --amber:#F59E0B;--amber2:#FBBF24;--amber-bg:#FEF3C7;
  --green:#059669;--green-bg:#D1FAE5;
  --red:#DC2626;--red-bg:#FEE2E2;
  --dark:#1E1B4B;--gray1:#374151;--gray2:#6B7280;--gray3:#9CA3AF;--gray4:#E5E7EB;--gray5:#F9FAFB;
  --white:#FFFFFF;
  --r:16px;--r-sm:10px;--r-xs:6px;
  --sh:0 4px 24px rgba(91,33,182,0.1);--sh-lg:0 20px 50px rgba(45,14,138,0.18);
}
html{scroll-behavior:smooth}
body{font-family:'DM Sans',sans-serif;background:var(--white);color:var(--dark);overflow-x:hidden;min-height:100vh}

nav{position:fixed;top:0;left:0;right:0;z-index:999;height:68px;background:rgba(255,255,255,0.95);backdrop-filter:blur(16px);border-bottom:1px solid var(--p6);display:flex;align-items:center;justify-content:space-between;padding:0 6%}
.nav-brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.brand-icon{width:38px;height:38px;background:linear-gradient(135deg,var(--p2),var(--p3));border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.1rem;color:var(--white);box-shadow:0 4px 12px rgba(91,33,182,0.3)}
.brand-name{font-family:'Sora',sans-serif;font-weight:800;font-size:1.25rem;background:linear-gradient(135deg,var(--p2),var(--amber));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.nav-actions{display:flex;align-items:center;gap:10px}
.nav-btn{background:var(--p7);color:var(--p2);border:1.5px solid var(--p5);border-radius:20px;padding:7px 18px;font-family:'DM Sans',sans-serif;font-weight:600;font-size:0.82rem;cursor:pointer;transition:all .2s}
.nav-btn:hover{background:var(--p2);color:var(--white);border-color:var(--p2)}
.nav-link{color:var(--gray2);text-decoration:none;font-size:0.85rem;font-weight:600;cursor:pointer;transition:color .2s}
.nav-link:hover{color:var(--p2)}
.user-badge{display:flex;align-items:center;gap:8px;background:var(--p7);border-radius:20px;padding:5px 14px 5px 5px;font-size:0.82rem;font-weight:600;color:var(--p2)}
.avatar{width:30px;height:30px;border-radius:50%;background:var(--p2);color:var(--white);display:flex;align-items:center;justify-content:center;font-size:0.75rem;font-weight:700}

.hero{margin-top:68px;background:linear-gradient(150deg,#F5F3FF 0%,#EDE9FE 50%,#DDD6FE 100%);padding:70px 6% 56px;text-align:center;position:relative;overflow:hidden}
.hero-orb1{position:absolute;top:-100px;right:-80px;width:380px;height:380px;background:radial-gradient(circle,rgba(124,58,237,.18) 0%,transparent 65%);border-radius:50%}
.hero-orb2{position:absolute;bottom:-80px;left:-60px;width:280px;height:280px;background:radial-gradient(circle,rgba(245,158,11,.14) 0%,transparent 65%);border-radius:50%}
.hero-badge{display:inline-flex;align-items:center;gap:6px;background:var(--white);border:1px solid var(--p5);color:var(--p2);font-size:0.78rem;font-weight:700;padding:6px 16px;border-radius:20px;margin-bottom:22px;letter-spacing:.02em;text-transform:uppercase;box-shadow:var(--sh)}
.hero h1{font-family:'Sora',sans-serif;font-weight:800;font-size:clamp(2rem,5.5vw,3.4rem);line-height:1.12;color:var(--dark);margin-bottom:18px;position:relative;z-index:1}
.hero h1 .grad{background:linear-gradient(135deg,var(--p2),var(--amber));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero-sub{font-size:1.05rem;color:var(--gray2);max-width:520px;margin:0 auto 36px;line-height:1.7;position:relative;z-index:1}

.wrap{max-width:820px;margin:0 auto;padding:48px 5%}

.upload-zone{border:2px dashed var(--p4);border-radius:var(--r);background:var(--white);padding:44px 32px;text-align:center;cursor:pointer;transition:all .25s;position:relative;margin-bottom:16px}
.upload-zone:hover,.upload-zone.drag-over{border-color:var(--p3);background:var(--p7);transform:translateY(-3px);box-shadow:var(--sh)}
.upload-zone.loaded{border-style:solid;border-color:var(--green);background:var(--green-bg)}
.upload-icon-wrap{width:72px;height:72px;background:linear-gradient(135deg,var(--p6),var(--p5));border-radius:20px;margin:0 auto 16px;display:flex;align-items:center;justify-content:center;font-size:2rem;transition:transform .3s}
.upload-zone:hover .upload-icon-wrap{transform:scale(1.08)}
.upload-zone h3{font-family:'Sora',sans-serif;font-weight:700;font-size:1.05rem;margin-bottom:6px}
.upload-zone p{color:var(--gray3);font-size:0.85rem;margin-bottom:18px}
.btn-browse{background:linear-gradient(135deg,var(--p2),var(--p3));color:var(--white);border:none;padding:10px 26px;border-radius:var(--r-sm);font-family:'DM Sans',sans-serif;font-weight:600;font-size:0.88rem;cursor:pointer;transition:all .2s;box-shadow:0 6px 18px rgba(91,33,182,.3)}
.btn-browse:hover{transform:translateY(-1px);box-shadow:0 10px 24px rgba(91,33,182,.4)}
#fileInput{display:none}
.file-chip{display:none;align-items:center;gap:8px;background:var(--green-bg);color:var(--green);border:1px solid #A7F3D0;border-radius:20px;padding:6px 14px;font-size:0.82rem;font-weight:600;margin-bottom:4px}
.file-chip.show{display:inline-flex}
.chip-x{cursor:pointer;opacity:.6;margin-left:2px;font-size:1rem;line-height:1;transition:opacity .2s}
.chip-x:hover{opacity:1}

.or-div{display:flex;align-items:center;gap:14px;color:var(--gray3);font-size:0.82rem;font-weight:600;letter-spacing:.04em;margin:20px 0}
.or-div::before,.or-div::after{content:'';flex:1;height:1px;background:var(--gray4)}

.paste-card{background:var(--white);border:1px solid var(--gray4);border-radius:var(--r);padding:22px;box-shadow:var(--sh)}
.paste-card label{font-family:'Sora',sans-serif;font-weight:700;font-size:0.88rem;color:var(--dark);display:block;margin-bottom:10px}
.paste-card textarea{width:100%;min-height:150px;border:1.5px solid var(--gray4);border-radius:var(--r-sm);padding:14px 16px;font-family:'DM Sans',sans-serif;font-size:0.9rem;color:var(--dark);resize:vertical;outline:none;transition:border-color .2s;line-height:1.65;background:var(--gray5)}
.paste-card textarea:focus{border-color:var(--p3);background:var(--white)}

.settings-bar{background:var(--white);border:1px solid var(--gray4);border-radius:var(--r);padding:22px 26px;box-shadow:var(--sh);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:18px;margin:22px 0}
.s-group label{font-family:'Sora',sans-serif;font-weight:700;font-size:0.82rem;color:var(--dark);display:block;margin-bottom:8px}
.q-ctrl{display:flex;align-items:center;gap:14px}
.q-btn{width:34px;height:34px;border-radius:8px;border:1.5px solid var(--p5);background:var(--p7);color:var(--p2);font-size:1.1rem;font-weight:800;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s;line-height:1;user-select:none}
.q-btn:hover{background:var(--p2);color:var(--white);border-color:var(--p2)}
.q-val{font-family:'Sora',sans-serif;font-weight:800;font-size:1.15rem;color:var(--p2);min-width:34px;text-align:center}
.btn-gen{background:linear-gradient(135deg,var(--amber),#F97316);color:var(--white);border:none;padding:14px 34px;border-radius:12px;font-family:'Sora',sans-serif;font-weight:700;font-size:0.95rem;cursor:pointer;display:flex;align-items:center;gap:8px;box-shadow:0 8px 20px rgba(245,158,11,.35);transition:all .2s;white-space:nowrap}
.btn-gen:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 12px 28px rgba(245,158,11,.45)}
.btn-gen:disabled{opacity:.55;cursor:not-allowed;transform:none}

#results{display:none;animation:fadeUp .4s ease}

.tabs{display:flex;gap:4px;background:var(--p7);border-radius:14px;padding:4px;margin-bottom:28px}
.tab{flex:1;padding:11px 14px;border:none;border-radius:11px;font-family:'DM Sans',sans-serif;font-weight:600;font-size:0.84rem;cursor:pointer;background:transparent;color:var(--gray2);transition:all .2s;text-align:center}
.tab.on{background:var(--white);color:var(--p2);box-shadow:var(--sh)}
.tc{display:none}.tc.on{display:block}

.sum-card{background:var(--white);border:1px solid var(--gray4);border-radius:var(--r);padding:30px;box-shadow:var(--sh);margin-bottom:18px}
.sum-card-hd{font-family:'Sora',sans-serif;font-weight:700;font-size:1rem;color:var(--dark);margin-bottom:22px;display:flex;align-items:center;gap:8px}
.punch-list{list-style:none;display:flex;flex-direction:column;gap:10px}
.punch-item{display:flex;gap:12px;align-items:flex-start;padding:13px 16px;background:var(--p7);border-left:3.5px solid var(--p3);border-radius:0 10px 10px 0;animation:fadeUp .3s ease both}
.punch-item:nth-child(even){border-left-color:var(--amber)}
.punch-n{font-family:'Sora',sans-serif;font-weight:800;font-size:0.72rem;color:var(--p3);min-width:26px;height:26px;background:var(--p6);border-radius:6px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.punch-item:nth-child(even) .punch-n{color:var(--amber);background:var(--amber-bg)}
.punch-txt{font-size:0.9rem;color:var(--dark);line-height:1.55}

.btn-row{display:flex;gap:12px;flex-wrap:wrap}
.btn-pri{background:linear-gradient(135deg,var(--p2),var(--p3));color:var(--white);border:none;padding:12px 24px;border-radius:var(--r-sm);font-family:'Sora',sans-serif;font-weight:700;font-size:0.86rem;cursor:pointer;display:flex;align-items:center;gap:7px;box-shadow:0 6px 16px rgba(91,33,182,.3);transition:all .2s}
.btn-pri:hover{transform:translateY(-1px);box-shadow:0 10px 22px rgba(91,33,182,.38)}
.btn-sec{background:var(--white);color:var(--p2);border:1.5px solid var(--p5);padding:12px 22px;border-radius:var(--r-sm);font-family:'Sora',sans-serif;font-weight:700;font-size:0.86rem;cursor:pointer;display:flex;align-items:center;gap:7px;transition:all .2s}
.btn-sec:hover{background:var(--p7)}

.quiz-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px;flex-wrap:wrap;gap:12px}
.quiz-prog{font-family:'Sora',sans-serif;font-weight:700;font-size:0.85rem;color:var(--gray2)}
.q-card{background:var(--white);border:1px solid var(--gray4);border-radius:var(--r);padding:26px;box-shadow:var(--sh);margin-bottom:14px;animation:fadeUp .25s ease both}
.q-num-lbl{font-family:'Sora',sans-serif;font-weight:700;font-size:0.7rem;color:var(--p4);text-transform:uppercase;letter-spacing:.06em;margin-bottom:8px}
.q-txt{font-family:'Sora',sans-serif;font-weight:600;font-size:0.93rem;color:var(--dark);line-height:1.5;margin-bottom:16px}
.q-chapter{font-size:0.72rem;color:var(--p2);font-weight:600;margin-bottom:10px;padding:3px 10px;background:var(--p1-bg);display:inline-block;border-radius:20px;letter-spacing:.02em}
.opts{display:flex;flex-direction:column;gap:8px}
.opt{display:flex;align-items:flex-start;gap:10px;padding:12px 14px;border:1.5px solid var(--gray4);border-radius:10px;background:var(--white);cursor:pointer;text-align:left;font-family:'DM Sans',sans-serif;font-size:0.87rem;color:var(--dark);transition:all .2s;line-height:1.45;width:100%}
.opt:hover:not([disabled]){border-color:var(--p3);background:var(--p7)}
.opt.sel{border-color:var(--p2);background:var(--p6)}
.opt.cor{border-color:var(--green);background:var(--green-bg);color:#065F46}
.opt.wrg{border-color:var(--red);background:var(--red-bg);color:#991B1B}
.opt-ltr{min-width:26px;height:26px;border-radius:7px;background:var(--p6);color:var(--p2);font-family:'Sora',sans-serif;font-weight:800;font-size:0.72rem;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:all .2s}
.opt.cor .opt-ltr{background:var(--green);color:var(--white)}
.opt.wrg .opt-ltr{background:var(--red);color:var(--white)}
.exp-box{margin-top:12px;padding:13px 15px;background:linear-gradient(135deg,var(--p7),var(--amber-bg));border-radius:10px;font-size:0.84rem;color:var(--gray1);line-height:1.6;display:none;border-left:3px solid var(--amber)}
.exp-box.show{display:block}
.sub-wrap{text-align:center;padding:28px 0 8px}
.btn-sub{background:linear-gradient(135deg,var(--p2),var(--p1));color:var(--white);border:none;padding:17px 52px;border-radius:14px;font-family:'Sora',sans-serif;font-weight:700;font-size:1rem;cursor:pointer;box-shadow:var(--sh-lg);transition:all .2s}
.btn-sub:hover{transform:translateY(-3px);box-shadow:0 24px 48px rgba(45,14,138,.28)}

.score-hero{background:linear-gradient(135deg,var(--p2),var(--p1));border-radius:var(--r);padding:40px 30px;text-align:center;color:var(--white);margin-bottom:22px;box-shadow:var(--sh-lg)}
.score-ring{width:120px;height:120px;border-radius:50%;background:rgba(255,255,255,.18);border:4px solid rgba(255,255,255,.45);margin:0 auto 18px;display:flex;flex-direction:column;align-items:center;justify-content:center}
.score-pct{font-family:'Sora',sans-serif;font-weight:800;font-size:2rem;line-height:1}
.score-lbl{font-size:0.68rem;opacity:.75;letter-spacing:.05em;text-transform:uppercase}
.score-hero h2{font-family:'Sora',sans-serif;font-size:1.35rem;margin-bottom:8px}
.score-hero p{opacity:.85;font-size:0.9rem;margin-bottom:22px}
.score-stats{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.sc-stat{background:rgba(255,255,255,.15);border-radius:10px;padding:11px 24px;text-align:center;backdrop-filter:blur(4px)}
.sc-stat .sv{font-family:'Sora',sans-serif;font-weight:800;font-size:1.5rem}
.sc-stat .sl{font-size:0.7rem;opacity:.75;text-transform:uppercase;letter-spacing:.04em}

.rev-list{display:flex;flex-direction:column;gap:10px;margin-top:4px}
.rev-item{border:1px solid var(--gray4);border-radius:12px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,.04)}
.rev-hd{padding:14px 16px;display:flex;gap:10px;align-items:flex-start;cursor:pointer;background:var(--white);transition:background .2s}
.rev-hd:hover{background:var(--gray5)}
.rev-badge{min-width:28px;height:28px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:0.75rem;font-weight:800;flex-shrink:0}
.rbg-ok{background:var(--green-bg);color:var(--green)}
.rbg-no{background:var(--red-bg);color:var(--red)}
.rev-q{font-size:0.87rem;font-weight:600;color:var(--dark);line-height:1.45}
.rev-body{display:none;padding:0 16px 14px;background:var(--white);border-top:1px solid var(--gray4)}
.rev-body.open{display:block}
.rev-ans{padding-top:12px;font-size:0.84rem;color:var(--gray2);line-height:1.6}
.ct{color:var(--green);font-weight:700}
.wt{color:var(--red);font-weight:700}

.ov{position:fixed;inset:0;background:rgba(30,27,75,.75);backdrop-filter:blur(8px);z-index:1000;display:none;align-items:center;justify-content:center}
.ov.show{display:flex}
.ov-box{background:var(--white);border-radius:var(--r);padding:44px 38px;text-align:center;max-width:340px;width:90%;box-shadow:var(--sh-lg)}
.spin{width:52px;height:52px;border:4px solid var(--p6);border-top-color:var(--p3);border-radius:50%;animation:spin .75s linear infinite;margin:0 auto 18px}
.ov-box h3{font-family:'Sora',sans-serif;font-weight:700;font-size:1rem;color:var(--dark);margin-bottom:6px}
.ov-box p{color:var(--gray3);font-size:0.84rem;margin-bottom:18px}
.prog-wrap{background:var(--p6);border-radius:20px;height:7px;overflow:hidden}
.prog-bar{height:100%;background:linear-gradient(90deg,var(--p3),var(--amber));border-radius:20px;transition:width .4s ease;width:0}

.toast{position:fixed;bottom:26px;right:26px;background:var(--dark);color:var(--white);padding:12px 22px;border-radius:12px;font-size:0.84rem;box-shadow:var(--sh-lg);z-index:1100;opacity:0;transform:translateY(8px);transition:all .3s;max-width:300px;pointer-events:none}
.toast.show{opacity:1;transform:translateY(0)}

/* Auth Modal */
.modal{position:fixed;inset:0;background:rgba(30,27,75,.6);backdrop-filter:blur(6px);z-index:2000;display:none;align-items:center;justify-content:center}
.modal.show{display:flex}
.modal-box{background:var(--white);border-radius:var(--r);padding:36px 32px;max-width:420px;width:90%;box-shadow:var(--sh-lg);max-height:90vh;overflow-y:auto}
.modal-box h2{font-family:'Sora',sans-serif;font-weight:800;font-size:1.25rem;margin-bottom:4px;color:var(--dark)}
.modal-box .modal-sub{color:var(--gray3);font-size:0.85rem;margin-bottom:22px}
.form-group{margin-bottom:16px}
.form-group label{display:block;font-size:0.82rem;font-weight:700;color:var(--gray1);margin-bottom:6px;font-family:'Sora',sans-serif}
.form-group input{width:100%;padding:11px 14px;border:1.5px solid var(--gray4);border-radius:10px;font-family:'DM Sans',sans-serif;font-size:0.9rem;outline:none;transition:border-color .2s}
.form-group input:focus{border-color:var(--p3)}
.form-group .error{color:var(--red);font-size:0.78rem;margin-top:4px}
.btn-full{width:100%;padding:13px;border:none;border-radius:10px;font-family:'Sora',sans-serif;font-weight:700;font-size:0.9rem;cursor:pointer;transition:all .2s}
.btn-full.primary{background:linear-gradient(135deg,var(--p2),var(--p3));color:var(--white);box-shadow:0 6px 16px rgba(91,33,182,.3)}
.btn-full.primary:hover{transform:translateY(-1px)}
.btn-full.primary:disabled{opacity:.5;transform:none;cursor:not-allowed}
.modal-switch{text-align:center;margin-top:16px;font-size:0.84rem;color:var(--gray2)}
.modal-switch a{color:var(--p3);font-weight:700;cursor:pointer;text-decoration:none}
.modal-close{float:right;font-size:1.3rem;cursor:pointer;color:var(--gray3);line-height:1;transition:color .2s}
.modal-close:hover{color:var(--dark)}

/* Plan badge */
.plan-badge{display:inline-block;font-size:0.65rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;padding:2px 10px;border-radius:20px}
.plan-badge.free{background:var(--gray4);color:var(--gray2)}
.plan-badge.pro{background:var(--green-bg);color:var(--green)}
.plan-badge.premium{background:var(--amber-bg);color:var(--amber)}

/* Limit banner */
.limit-banner{background:var(--amber-bg);border:1px solid var(--amber);border-radius:var(--r-sm);padding:14px 20px;margin-bottom:18px;display:none;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:0.85rem;color:var(--gray1)}
.limit-banner.show{display:flex}
.limit-banner .btn-upgrade{background:var(--amber);color:var(--white);border:none;padding:7px 18px;border-radius:8px;font-weight:700;font-size:0.82rem;cursor:pointer;white-space:nowrap}

/* Flashcard view */
.deck-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px;margin-bottom:22px}
.deck-card{background:var(--white);border:1px solid var(--gray4);border-radius:12px;padding:18px;cursor:pointer;transition:all .2s;box-shadow:var(--sh)}
.deck-card:hover{transform:translateY(-2px);border-color:var(--p3)}
.deck-card h4{font-family:'Sora',sans-serif;font-weight:700;font-size:0.88rem;color:var(--dark);margin-bottom:4px}
.deck-card p{font-size:0.78rem;color:var(--gray3)}
.flip-card{perspective:1000px;height:260px;cursor:pointer;margin-bottom:22px}
.flip-inner{position:relative;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d}
.flip-card.flipped .flip-inner{transform:rotateY(180deg)}
.flip-front,.flip-back{position:absolute;inset:0;backface-visibility:hidden;border-radius:var(--r);padding:30px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}
.flip-front{background:var(--white);border:1px solid var(--gray4);box-shadow:var(--sh)}
.flip-back{background:linear-gradient(135deg,var(--p6),var(--p5));border:1px solid var(--p4);transform:rotateY(180deg)}
.flip-front .card-label,.flip-back .card-label{font-size:0.65rem;text-transform:uppercase;letter-spacing:.08em;color:var(--gray3);font-weight:700;margin-bottom:12px}
.flip-front .card-text{font-family:'Sora',sans-serif;font-weight:600;font-size:1.1rem;color:var(--dark);line-height:1.5}
.flip-back .card-text{font-size:0.95rem;color:var(--gray1);line-height:1.6}
.rate-btns{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.rate-btn{padding:10px 18px;border-radius:10px;border:none;font-weight:700;font-size:0.82rem;cursor:pointer;transition:all .2s;font-family:'Sora',sans-serif}
.rate-btn:hover{transform:translateY(-1px)}

footer{background:var(--dark);color:rgba(255,255,255,.5);text-align:center;padding:26px 5%;font-size:0.8rem;margin-top:60px}
footer strong{color:var(--p4)}

@keyframes fadeUp{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}
@keyframes spin{to{transform:rotate(360deg)}}

@media(max-width:768px){
  nav{padding:0 4%}
  .nav-actions{gap:6px}
  .nav-btn{font-size:0.75rem;padding:6px 12px}
  .nav-link{font-size:0.78rem}
  .brand-name{font-size:1rem}
  .user-badge{font-size:0.75rem;padding:4px 10px 4px 4px}
  .avatar{width:26px;height:26px;font-size:0.65rem}
}

@media(max-width:600px){
  nav{padding:0 4%}
  .hero{padding:44px 5% 36px}
  .hero h1{font-size:1.6rem}
  .hero-sub{font-size:0.9rem}
  .hero-badge{font-size:0.7rem;padding:4px 12px}
  .wrap{padding:24px 4%}
  .settings-bar{flex-direction:column;align-items:stretch}
  .s-group{width:100%}
  .q-ctrl{justify-content:center}
  .btn-gen{width:100%;justify-content:center}
  .btn-row button{width:100%;justify-content:center}
  .btn-row{flex-direction:column}
  .score-stats{gap:6px}
  .sc-stat{padding:8px 12px}
  .sc-stat .sv{font-size:1.1rem}
  .score-hero{padding:24px 16px}
  .score-hero h2{font-size:1.1rem}
  .score-ring{width:90px;height:90px}
  .score-pct{font-size:1.5rem}
  .tabs{gap:2px;overflow-x:auto;flex-wrap:nowrap}
  .tab{font-size:0.72rem;padding:8px 8px;white-space:nowrap}
  .q-card{padding:16px 14px}
  .q-txt{font-size:0.85rem}
  .opt{font-size:0.82rem;padding:10px 12px}
  .upload-zone{padding:28px 16px}
  .upload-icon-wrap{width:56px;height:56px;font-size:1.5rem}
  .upload-zone h3{font-size:0.95rem}
  .paste-card{padding:16px}
  .paste-card textarea{min-height:120px;font-size:0.85rem}
  .deck-grid{grid-template-columns:1fr}
  .flip-card{height:200px}
  .flip-front,.flip-back{padding:18px}
  .flip-front .card-text{font-size:0.9rem}
  .flip-back .card-text{font-size:0.85rem}
  .rate-btn{padding:7px 12px;font-size:0.75rem}
  .btn-sub{padding:14px 30px;font-size:0.9rem}
  .modal-box{padding:24px 20px}
  .toast{bottom:16px;right:16px;left:16px;max-width:none;font-size:0.8rem}
  footer{font-size:0.72rem;padding:20px 5%}
  .sum-card{padding:20px}
  .punch-item{padding:10px 12px;font-size:0.85rem}
  .hero-orb1{width:200px;height:200px;top:-60px;right:-40px}
  .hero-orb2{width:160px;height:160px;bottom:-50px;left:-30px}
}

/* Tutor Chat */
.chat-fab{position:fixed;bottom:82px;right:26px;z-index:900;width:56px;height:56px;border-radius:50%;background:linear-gradient(135deg,var(--p2),var(--p3));color:var(--white);border:none;font-size:1.4rem;cursor:pointer;box-shadow:0 8px 24px rgba(91,33,182,.4);transition:all .25s;display:flex;align-items:center;justify-content:center}
.chat-fab:hover{transform:scale(1.08);box-shadow:0 12px 32px rgba(91,33,182,.5)}
.chat-fab.hidden{display:none}
.chat-modal{position:fixed;bottom:82px;right:26px;z-index:900;width:360px;height:500px;background:var(--white);border-radius:var(--r);box-shadow:var(--sh-lg);display:none;flex-direction:column;overflow:hidden;border:1px solid var(--gray4);animation:fadeUp .25s ease}
.chat-modal.show{display:flex}
.chat-hd{background:linear-gradient(135deg,var(--p2),var(--p3));color:var(--white);padding:16px 18px;display:flex;justify-content:space-between;align-items:center;flex-shrink:0}
.chat-hd h3{font-family:'Sora',sans-serif;font-weight:700;font-size:0.9rem;display:flex;align-items:center;gap:8px}
.chat-hd button{background:none;border:none;color:var(--white);font-size:1.1rem;cursor:pointer;opacity:.8}
.chat-hd button:hover{opacity:1}
.chat-msgs{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:10px;background:var(--gray5)}
.chat-msg{max-width:85%;padding:10px 14px;border-radius:12px;font-size:0.84rem;line-height:1.5;animation:fadeUp .2s ease}
.chat-msg.user{background:var(--p2);color:var(--white);align-self:flex-end;border-bottom-right-radius:4px}
.chat-msg.bot{background:var(--white);color:var(--dark);align-self:flex-start;border:1px solid var(--gray4);border-bottom-left-radius:4px}
.chat-msg.bot .chat-typing{display:flex;gap:4px;padding:4px 0}
.chat-msg.bot .chat-typing span{width:6px;height:6px;border-radius:50%;background:var(--gray3);animation:chatBounce 1.2s infinite}
.chat-msg.bot .chat-typing span:nth-child(2){animation-delay:.2s}
.chat-msg.bot .chat-typing span:nth-child(3){animation-delay:.4s}
.chat-foot{display:flex;gap:8px;padding:12px 14px;border-top:1px solid var(--gray4);background:var(--white);flex-shrink:0}
.chat-foot input{flex:1;border:1.5px solid var(--gray4);border-radius:10px;padding:10px 14px;font-family:'DM Sans',sans-serif;font-size:0.84rem;outline:none;transition:border-color .2s}
.chat-foot input:focus{border-color:var(--p3)}
.chat-foot button{background:var(--p2);color:var(--white);border:none;border-radius:10px;padding:10px 16px;font-family:'Sora',sans-serif;font-weight:700;font-size:0.82rem;cursor:pointer;transition:all .2s;white-space:nowrap}
.chat-foot button:hover{background:var(--p3)}
.chat-foot button:disabled{opacity:.5;cursor:not-allowed}
.chat-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:var(--gray3);text-align:center;padding:30px}
.chat-empty .chat-empty-icon{font-size:2.5rem;margin-bottom:12px}
.chat-empty p{font-size:0.85rem;line-height:1.5}
.chat-limit{font-size:0.72rem;color:var(--gray3);text-align:center;padding:6px;background:var(--amber-bg);border-top:1px solid var(--amber)}

/* Due Review */
.due-badge{display:inline-flex;align-items:center;gap:4px;background:var(--red-bg);color:var(--red);font-size:0.7rem;font-weight:700;padding:2px 8px;border-radius:10px}
.due-review-header{text-align:center;padding:20px 0}
.due-review-header h2{font-family:'Sora',sans-serif;font-weight:800;font-size:1.2rem;color:var(--dark);margin-bottom:4px}
.due-review-header p{color:var(--gray3);font-size:0.85rem}
.due-empty{text-align:center;padding:50px 20px;color:var(--gray3)}
.due-empty .due-empty-icon{font-size:3rem;margin-bottom:12px}
.due-empty p{font-size:0.9rem;line-height:1.5}

/* Generation mode selector */
.gen-modes{display:flex;gap:6px;background:var(--p7);border-radius:10px;padding:4px;margin-bottom:16px;flex-wrap:wrap}
.gen-mode{flex:1;padding:8px 12px;border:none;border-radius:8px;font-family:'DM Sans',sans-serif;font-weight:600;font-size:0.78rem;cursor:pointer;background:transparent;color:var(--gray2);transition:all .2s;text-align:center;min-width:0}
.gen-mode.on{background:var(--white);color:var(--p2);box-shadow:var(--sh)}

/* Publish toggle */
.publish-toggle{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:20px;font-size:0.78rem;font-weight:600;cursor:pointer;border:1.5px solid var(--gray4);background:var(--white);color:var(--gray2);transition:all .2s;font-family:'DM Sans',sans-serif}
.publish-toggle.on{background:var(--green-bg);border-color:var(--green);color:var(--green)}
.publish-toggle:hover{border-color:var(--p3)}

/* Quiz results history */
.quiz-history-item{padding:14px 16px;border:1px solid var(--gray4);border-radius:10px;margin-bottom:8px;display:flex;align-items:center;justify-content:space-between;gap:12px;cursor:pointer;transition:all .2s}
.quiz-history-item:hover{border-color:var(--p3);background:var(--p7)}

@keyframes chatBounce{0%,80%,100%{transform:scale(1)}40%{transform:scale(1.4)}}

@media(max-width:600px){
  .chat-modal{width:calc(100vw - 32px);right:16px;bottom:76px;height:440px}
  .chat-fab{bottom:76px;right:16px;width:50px;height:50px;font-size:1.2rem}
  .chat-msgs{padding:10px}
  .chat-msg{font-size:0.82rem;max-width:90%}
  .gen-modes{flex-direction:column}
}
}