/* ============================================================
   V1 CSS FOUNDATION — exact copy from ash1x769.github.io
   V2 features appended below
============================================================ */
*{box-sizing:border-box;margin:0;padding:0}
:root{
  --bio:#22C55E;--bio-light:#F0FDF4;--bio-dark:#15803D;
  --chem:#A855F7;--chem-light:#FAF5FF;--chem-dark:#7E22CE;
  --phys:#3B82F6;--phys-light:#EFF6FF;--phys-dark:#1D4ED8;
  --streak:#F97316;--streak-light:#FFF7ED;
  --indigo:#6366F1;--indigo-light:#EEF2FF;
  --good:#22C55E;--ok:#F59E0B;--hard:#EF4444;--again:#A855F7;
  --bg:#F8FAFC;--surface:#fff;--border:#E2E8F0;
  --text:#0F172A;--muted:#64748B;
  --radius:16px;
  --shadow:0 1px 3px rgba(0,0,0,0.07),0 4px 16px rgba(0,0,0,0.05);
  --shadow-lg:0 4px 6px rgba(0,0,0,0.04),0 10px 40px rgba(0,0,0,0.08);
  /* V2 tokens */
  --ss-green:#00C896;--ss-blue:#4F8EF7;--ss-purple:#8B5CF6;
  --ss-red:#EF4444;--ss-orange:#FF7043;--ss-pink:#FF6B9D;
  --bg-card:#FFFFFF;--bg-dark:#1E293B;
  --font:'Nunito',sans-serif;
  --radius-sm:12px;--radius-lg:20px;
  --text-secondary:#64748B;--text-light:#94A3B8;
  --border-focus:#4F8EF7;
}

body{font-family:"Nunito",sans-serif;background:var(--bg);color:var(--text);min-height:100vh;overflow-x:hidden}

/* NAV */
.nav{background:#fff;border-bottom:1px solid #E8EDF2;padding:0 32px;padding-top:env(safe-area-inset-top,0px);display:flex;align-items:center;justify-content:space-between;height:64px;position:sticky;top:0;z-index:200;box-shadow:0 1px 0 #E8EDF2,0 4px 16px rgba(15,23,42,0.06);gap:16px}
.logo{font-size:20px;font-weight:900;display:flex;align-items:center;gap:8px;text-decoration:none;flex-shrink:0}
.logo-text{background:linear-gradient(135deg,#22C55E 0%,#6366F1 60%,#A855F7 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;letter-spacing:-0.3px}
.nav-tabs{display:flex;align-items:center;gap:2px;flex-shrink:0}
.nav-tab{padding:8px 16px;border-radius:10px;border:none;background:transparent;font-family:"Nunito",sans-serif;font-weight:700;font-size:14px;cursor:pointer;color:#64748B;transition:all .18s;white-space:nowrap;letter-spacing:-0.1px}
.nav-tab:hover{background:#F1F5F9;color:#0F172A}
.nav-tab.active{background:#6366F1;color:#fff;box-shadow:0 2px 8px rgba(99,102,241,0.35)}
.nav-right{display:flex;align-items:center;gap:10px;flex-shrink:0}
.streak-pill{display:flex;align-items:center;gap:5px;background:#FFF7ED;border:1.5px solid #F97316;border-radius:24px;padding:6px 14px;font-weight:800;font-size:14px;color:#F97316;flex-shrink:0;letter-spacing:-0.2px}
.fire{animation:flicker 1.5s ease-in-out infinite}
@keyframes flicker{0%,100%{transform:scale(1) rotate(-2deg)}50%{transform:scale(1.15) rotate(2deg)}}
.profile-wrap{position:relative;flex-shrink:0}
.profile-btn{background:#F8FAFC;border:1.5px solid #E2E8F0;border-radius:50%;width:38px;height:38px;display:flex;align-items:center;justify-content:center;cursor:pointer;color:#64748B;transition:all .18s;padding:0;font-size:16px}
.profile-btn:hover{border-color:#6366F1;color:#6366F1;background:#EEF2FF;transform:scale(1.05)}
.profile-dropdown{position:absolute;top:calc(100% + 8px);right:0;background:#fff;border:1px solid #E2E8F0;border-radius:16px;box-shadow:0 8px 32px rgba(15,23,42,0.12),0 2px 8px rgba(15,23,42,0.06);min-width:180px;z-index:999;overflow:hidden;display:none;padding:6px}
.profile-dropdown.open{display:block;animation:dropDown .15s ease}
@keyframes dropDown{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}
.pd-item{display:flex;align-items:center;gap:10px;padding:10px 12px;font-family:"Nunito",sans-serif;font-size:14px;font-weight:700;cursor:pointer;color:#0F172A;border:none;background:none;width:100%;text-align:left;transition:.15s;border-radius:10px}
.pd-item:hover{background:#F1F5F9}
.pd-sep{height:1px;background:#F1F5F9;margin:4px 0}
@media(max-width:600px){.nav{padding:0 16px;gap:8px}.nav-tab{padding:7px 8px;font-size:12px}.logo-text{display:none}}
@media(max-width:380px){.streak-pill{padding:5px 9px;font-size:13px}}

/* SCREENS */
.screen{display:block;padding:20px;max-width:860px;margin:0 auto}

/* AUTH */
.auth-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;background:linear-gradient(135deg,#F0FDF4,#EFF6FF,#FAF5FF)}
.auth-card{background:var(--surface);border-radius:24px;padding:36px;max-width:400px;width:100%;box-shadow:var(--shadow-lg);border:2px solid var(--border)}
.auth-logo{text-align:center;font-size:32px;margin-bottom:6px}
.auth-title{text-align:center;font-size:22px;font-weight:900;margin-bottom:4px}
.auth-sub{text-align:center;color:var(--muted);font-size:14px;font-weight:600;margin-bottom:24px}
.auth-tabs{display:flex;background:#F1F5F9;border-radius:10px;padding:3px;margin-bottom:20px}
.auth-tab{flex:1;padding:8px;border-radius:8px;border:none;background:transparent;font-family:"Nunito",sans-serif;font-weight:700;font-size:12px;cursor:pointer;color:var(--muted);transition:.2s;white-space:nowrap}
.auth-tab.active{background:var(--surface);color:var(--text);box-shadow:0 1px 3px rgba(0,0,0,0.1)}
.form-group{margin-bottom:14px}
.form-label{display:block;font-size:12px;font-weight:800;color:var(--muted);margin-bottom:5px;text-transform:uppercase;letter-spacing:.5px}
.form-input{width:100%;padding:11px 13px;border-radius:10px;border:2px solid var(--border);font-family:"Nunito",sans-serif;font-size:14px;font-weight:600;color:var(--text);background:var(--bg);transition:.2s;outline:none}
.form-input:focus{border-color:var(--indigo);background:var(--surface)}
.form-select{width:100%;padding:11px 13px;border-radius:10px;border:2px solid var(--border);font-family:"Nunito",sans-serif;font-size:14px;font-weight:600;color:var(--text);background:var(--bg);outline:none}
.auth-btn{width:100%;padding:13px;border-radius:12px;border:none;font-family:"Nunito",sans-serif;font-size:15px;font-weight:900;cursor:pointer;background:linear-gradient(135deg,var(--indigo),#8B5CF6);color:#fff;box-shadow:0 4px 16px rgba(99,102,241,.28);transition:.2s;margin-top:6px}
.auth-btn:hover{transform:translateY(-2px)}
.auth-btn:disabled{opacity:.6;cursor:not-allowed;transform:none}
.auth-error{background:#FEF2F2;border:2px solid #FCA5A5;border-radius:10px;padding:10px 13px;font-size:13px;font-weight:700;color:var(--hard);margin-bottom:14px;display:none}
.auth-success{background:#F0FDF4;border:2px solid #86EFAC;border-radius:10px;padding:10px 13px;font-size:13px;font-weight:700;color:var(--bio-dark);margin-bottom:14px;display:none}

/* HOME */
.hero{text-align:center;padding:24px 0 16px}
.hero h1{font-size:24px;font-weight:900;margin-bottom:5px}
.hero p{color:var(--muted);font-size:14px;font-weight:600}
.xp-wrap{background:var(--surface);border:2px solid var(--border);border-radius:12px;padding:11px 15px;margin:10px 0;display:flex;align-items:center;gap:11px}
.xp-lbl{font-size:11px;font-weight:800;color:var(--muted);white-space:nowrap}
.xp-track{flex:1;height:9px;background:#F1F5F9;border-radius:5px;overflow:hidden}
.xp-fill{height:100%;background:linear-gradient(90deg,var(--indigo),#8B5CF6);border-radius:5px;transition:.6s cubic-bezier(.34,1.56,.64,1)}
.xp-pts{font-size:12px;font-weight:800;color:var(--indigo);white-space:nowrap}
.streak-banner{background:linear-gradient(135deg,#F97316,#FB923C);border-radius:var(--radius);padding:15px 18px;margin:10px 0;color:#fff;display:flex;align-items:center;gap:13px;box-shadow:0 6px 20px rgba(249,115,22,.22)}
.s-num{font-size:42px;font-weight:900;line-height:1}
.s-info h3{font-size:16px;font-weight:900}
.s-info p{font-size:12px;opacity:.9;font-weight:600;margin-top:2px}
.s-dots{display:flex;gap:5px;margin-top:7px}
.sdot{width:22px;height:22px;border-radius:50%;background:rgba(255,255,255,.25);display:flex;align-items:center;justify-content:center;font-size:10px;font-weight:800}
.sdot.done{background:#fff;color:var(--streak)}
.sec-label{font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.8px;color:var(--muted);margin:18px 0 8px}
.today-card{background:var(--surface);border:2px solid var(--border);border-radius:var(--radius);padding:16px;margin:12px 0;box-shadow:var(--shadow)}
.today-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}
.today-title{font-size:14px;font-weight:900}
.today-day{font-size:12px;font-weight:700;color:var(--muted)}
.subject-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:12px}
.subj-big{border-radius:var(--radius);padding:18px 12px;border:3px solid transparent;position:relative;text-align:center;transition:.2s}
.subj-big.clickable{cursor:pointer}
.subj-big.clickable:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.subj-big.bio{background:var(--bio-light);border-color:var(--bio)}
.subj-big.chem{background:var(--chem-light);border-color:var(--chem)}
.subj-big.phys{background:var(--phys-light);border-color:var(--phys)}
.subj-big.subj-locked{opacity:.65;background:#F8FAFC;border-color:#CBD5E1;cursor:not-allowed}
.subj-big-icon{font-size:34px;margin-bottom:7px}
.subj-big-name{font-size:15px;font-weight:900;margin-bottom:3px}
.subj-big-detail{font-size:11px;font-weight:700;opacity:.8}
.subj-big-pip{position:absolute;top:8px;right:8px;min-width:20px;height:20px;border-radius:10px;font-size:10px;font-weight:900;display:flex;align-items:center;justify-content:center;padding:0 5px}
.has-cards{background:#EF4444;color:#fff}
.all-done{background:#22C55E;color:#fff}
.today-tag{display:inline-block;background:var(--indigo-light);color:var(--indigo);border-radius:5px;padding:1px 6px;font-size:9px;font-weight:900;margin-bottom:4px}
.start-today{width:100%;padding:14px;border-radius:var(--radius);border:none;font-family:"Nunito",sans-serif;font-size:15px;font-weight:900;cursor:pointer;background:linear-gradient(135deg,var(--indigo),#8B5CF6);color:#fff;box-shadow:0 4px 16px rgba(99,102,241,.28);transition:.2s}
.start-today:hover{transform:translateY(-2px)}
.start-today:disabled{opacity:.5;cursor:not-allowed;transform:none}
.unlock-link{display:block;width:100%;text-align:center;margin-top:10px;background:none;border:none;font-family:"Nunito",sans-serif;font-size:13px;font-weight:800;color:var(--indigo);cursor:pointer;opacity:.8;text-decoration:underline;text-underline-offset:2px}
.badges-wrap{display:flex;gap:6px;flex-wrap:wrap}
.badge{background:#F8FAFC;border:2px solid var(--border);border-radius:9px;padding:5px 10px;font-size:11px;font-weight:800;display:flex;align-items:center;gap:4px;color:var(--muted)}
.badge.earned{background:var(--indigo-light);border-color:var(--indigo);color:#4338CA}

/* TOPIC PICKER */
.back-btn{display:inline-flex;align-items:center;gap:6px;background:none;border:none;font-family:"Nunito",sans-serif;font-weight:800;font-size:14px;cursor:pointer;color:var(--muted);margin-bottom:13px;padding:5px 0}
.back-btn:hover{color:var(--text)}
.picker-title{font-size:21px;font-weight:900;margin-bottom:3px}
.picker-sub{color:var(--muted);font-weight:600;font-size:13px;margin-bottom:13px}
.topic-list{display:flex;flex-direction:column;gap:7px}
.topic-row{background:var(--surface);border-radius:12px;padding:12px 14px;border:2px solid var(--border);display:flex;align-items:center;justify-content:space-between;cursor:pointer;transition:.2s}
.topic-row:hover:not(.locked-row){border-color:#C7D2FE;background:#FAFAFE}
.topic-row.locked-row{opacity:.55;cursor:not-allowed}
.tr-left{display:flex;align-items:center;gap:9px}
.tr-num{width:27px;height:27px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-weight:900;font-size:11px;color:#fff;flex-shrink:0}
.tr-name{font-weight:800;font-size:14px}
.tr-meta{font-size:11px;color:var(--muted);font-weight:600;margin-top:1px}
.tr-prog{height:3px;background:#F1F5F9;border-radius:3px;margin-top:4px;width:140px;overflow:hidden}
.tr-prog-fill{height:100%;border-radius:3px}
.due-pip{background:#FEE2E2;color:#DC2626;border-radius:20px;padding:2px 8px;font-size:11px;font-weight:800}
.done-tag{color:var(--good);font-size:12px;font-weight:800}
.unlock-pct{font-size:11px;font-weight:700;color:var(--muted)}

/* QUIZ */
.quiz-hdr{display:flex;align-items:center;gap:9px;margin-bottom:14px}
.q-exit-btn{background:none;border:2px solid var(--border);border-radius:8px;width:32px;height:32px;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:15px;font-weight:900;color:var(--muted);transition:.2s;flex-shrink:0}
.q-exit-btn:hover{border-color:#FCA5A5;color:var(--hard);background:#FEF2F2}
.qp-track{flex:1;height:8px;background:#F1F5F9;border-radius:5px;overflow:hidden}
.qp-fill{height:100%;border-radius:5px;background:linear-gradient(90deg,var(--indigo),#8B5CF6);transition:.4s}
.q-cnt{font-weight:800;font-size:12px;color:var(--muted);white-space:nowrap}
.q-stag{padding:4px 10px;border-radius:20px;font-weight:800;font-size:11px;flex-shrink:0}
.q-nav{display:flex;gap:6px}
.q-nav-btn{background:var(--surface);border:2px solid var(--border);border-radius:8px;width:32px;height:32px;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:14px;font-weight:800;color:var(--muted);transition:.2s;flex-shrink:0}
.q-nav-btn:hover:not(:disabled){border-color:#C7D2FE;color:var(--indigo)}
.q-nav-btn:disabled{opacity:.3;cursor:not-allowed}
.card-wrap{background:var(--surface);border-radius:18px;padding:22px;box-shadow:var(--shadow);margin-bottom:11px;border:2px solid var(--border)}
.card-meta{display:flex;align-items:center;gap:6px;margin-bottom:12px;flex-wrap:wrap}
.c-topic{padding:3px 9px;border-radius:20px;font-size:10px;font-weight:800}
.c-tier{padding:3px 8px;border-radius:20px;font-size:10px;font-weight:800}
.c-tier.f{background:#F0FDF4;color:#15803D}
.c-tier.h{background:#FEF3C7;color:#92400E}
.c-new{padding:3px 8px;border-radius:20px;font-size:10px;font-weight:800;background:var(--indigo-light);color:var(--indigo)}
.card-q{font-size:16px;font-weight:800;line-height:1.45;margin-bottom:13px}
.reveal-btn{width:100%;padding:13px;border-radius:12px;border:2px dashed #CBD5E1;background:#F8FAFC;font-family:"Nunito",sans-serif;font-size:15px;font-weight:800;cursor:pointer;color:var(--muted);transition:.2s}
.reveal-btn:hover{background:var(--indigo-light);border-color:#A5B4FC;color:var(--indigo)}
.answer-sec{border-top:2px solid #F1F5F9;padding-top:14px;margin-top:3px;animation:fadeUp .3s ease}
@keyframes fadeUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.ans-lbl{font-size:10px;font-weight:800;text-transform:uppercase;letter-spacing:.8px;color:var(--indigo);margin-bottom:9px}
.ans-list{list-style:none;display:flex;flex-direction:column;gap:7px}
.ans-list li{display:block;font-size:14px;font-weight:600;line-height:1.6;padding-left:18px;position:relative}
.ans-list li::before{content:"\2736";color:var(--indigo);font-size:10px;position:absolute;left:0;top:5px}
.ans-list li strong{color:var(--text);font-weight:900}
.rating-wrap{margin-top:11px}
.rating-prompt{text-align:center;font-weight:800;font-size:12px;color:var(--muted);margin-bottom:8px}
.rating-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}
.rate-btn{padding:12px 4px;border-radius:11px;border:none;font-family:"Nunito",sans-serif;font-weight:900;font-size:12px;cursor:pointer;transition:.2s;display:flex;flex-direction:column;align-items:center;gap:3px}
.rate-btn:hover{transform:translateY(-3px)}
.rate-btn .em{font-size:19px}
.rate-btn.again{background:#FAF5FF;color:var(--again)}
.rate-btn.hard{background:#FEF2F2;color:var(--hard)}
.rate-btn.good{background:#FFFBEB;color:var(--ok)}
.rate-btn.easy{background:#F0FDF4;color:var(--good)}
.exam-reveal-btn{width:100%;padding:10px 14px;border-radius:12px;border:2px solid #E0E7FF;background:var(--surface);font-family:"Nunito",sans-serif;font-size:13px;font-weight:800;cursor:pointer;color:var(--indigo);text-align:left;display:flex;align-items:center;gap:8px;transition:.2s;margin-top:10px}
.exam-reveal-btn:hover{background:var(--indigo-light);border-color:#818CF8}
.exam-card{background:var(--surface);border-radius:14px;padding:18px;border:2px solid #C7D2FE;margin-top:8px;box-shadow:var(--shadow);display:none}
.exam-card.open{display:block;animation:fadeUp .3s ease}
.exam-wow{display:inline-block;background:#FEF3C7;color:#92400E;border-radius:6px;padding:3px 9px;font-size:11px;font-weight:900;margin-bottom:8px}
.exam-q-box{background:#F8FAFF;border-radius:10px;padding:13px;border:2px solid #C7D2FE;margin-bottom:10px}
.exam-q-text{font-size:14px;font-weight:700;color:var(--text);font-style:italic;margin-bottom:8px;line-height:1.4}
.exam-marks-pill{display:inline-block;background:var(--indigo);color:#fff;border-radius:5px;padding:2px 9px;font-size:11px;font-weight:800}
.exam-ms-lbl{font-size:10px;font-weight:800;text-transform:uppercase;letter-spacing:.8px;color:var(--indigo);margin-bottom:8px}
.exam-ms-opt{display:flex;align-items:flex-start;gap:8px;font-size:14px;font-weight:600;color:var(--text);margin-bottom:6px}
.exam-ms-opt .tick{color:var(--good);font-size:14px;flex-shrink:0}

/* COMPLETE */
.comp-wrap{text-align:center;padding:32px 14px}
.comp-emoji{font-size:56px;margin-bottom:11px;animation:bounce 1s ease infinite}
@keyframes bounce{0%,100%{transform:translateY(0)}50%{transform:translateY(-11px)}}
.comp-title{font-size:22px;font-weight:900;margin-bottom:5px}
.comp-sub{color:var(--muted);font-weight:600;font-size:14px;margin-bottom:18px}
.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin:12px 0}
.stat-card{background:var(--surface);border-radius:13px;padding:13px;box-shadow:var(--shadow);border:2px solid var(--border)}
.stat-n{font-size:24px;font-weight:900;margin-bottom:3px}
.stat-l{font-size:10px;color:var(--muted);font-weight:700;text-transform:uppercase;letter-spacing:.4px}
.unlock-notice{background:#F0FDF4;border:2px solid var(--good);border-radius:13px;padding:14px;margin:12px 0;text-align:left}
.unlock-notice h4{font-size:14px;font-weight:900;color:var(--bio-dark);margin-bottom:4px}
.unlock-notice p{font-size:13px;font-weight:600;color:var(--bio-dark);opacity:.9}
.streak-cel{background:linear-gradient(135deg,#F97316,#FB923C);border-radius:14px;padding:15px;color:#fff;margin:12px 0}
.comp-btns{display:flex;flex-direction:column;gap:7px;margin-top:11px}
.cbtn{padding:14px;border-radius:var(--radius);border:none;font-family:"Nunito",sans-serif;font-size:15px;font-weight:900;cursor:pointer;transition:.2s}
.cbtn.primary{background:linear-gradient(135deg,var(--indigo),#8B5CF6);color:#fff;box-shadow:0 4px 16px rgba(99,102,241,.28)}
.cbtn.secondary{background:var(--surface);color:var(--indigo);border:2px solid #C7D2FE}
.cbtn:hover{transform:translateY(-2px)}

/* DASHBOARD */
.dash-hdr{margin-bottom:14px}
.dash-hdr h2{font-size:19px;font-weight:900;margin-bottom:3px}
.dash-hdr p{color:var(--muted);font-size:13px;font-weight:600}
.stabs{display:flex;gap:5px;margin-bottom:14px;overflow-x:auto;padding-bottom:3px}
.stab{padding:7px 13px;border-radius:20px;border:2px solid var(--border);background:var(--surface);font-family:"Nunito",sans-serif;font-weight:800;font-size:12px;cursor:pointer;white-space:nowrap;transition:.2s}
.stab.active{background:var(--indigo-light);border-color:var(--indigo);color:#4338CA}
.teacher-section{background:var(--surface);border:2px solid var(--border);border-radius:var(--radius);padding:16px;margin-bottom:12px}
.teacher-section h3{font-size:13px;font-weight:900;margin-bottom:12px}
.tul-row{display:flex;align-items:center;justify-content:space-between;padding:7px 10px;border-radius:8px;background:#F8FAFC;border:1px solid var(--border);margin-bottom:5px}
.tul-name{font-size:12px;font-weight:700}
.tul-pct{font-size:11px;color:var(--muted);font-weight:600}
.toggle-btn{padding:4px 12px;border-radius:20px;border:2px solid;font-family:"Nunito",sans-serif;font-size:11px;font-weight:800;cursor:pointer;transition:.2s}
.toggle-btn.unlocked{background:#F0FDF4;border-color:var(--good);color:var(--bio-dark)}
.toggle-btn.locked{background:#FEF2F2;border-color:var(--hard);color:#B91C1C}
.dash-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px}
.dash-card{background:var(--surface);border-radius:var(--radius);padding:14px;box-shadow:var(--shadow);border:2px solid var(--border)}
.dash-lbl{font-size:10px;font-weight:800;color:var(--muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:9px}
.dash-big{font-size:33px;font-weight:900;margin-bottom:2px}
.dash-sub{font-size:11px;color:var(--muted);font-weight:600}
.dash-full{grid-column:1/-1}
.sbar{margin:7px 0}
.sbar-lbl{display:flex;justify-content:space-between;font-size:11px;font-weight:800;margin-bottom:2px}
.sbar-track{height:7px;background:#F1F5F9;border-radius:4px;overflow:hidden}
.sbar-fill{height:100%;border-radius:4px;transition:.5s}
.heatmap{display:grid;grid-template-columns:repeat(7,1fr);gap:3px;margin-top:7px}
.hcell{aspect-ratio:1;border-radius:3px;background:#F1F5F9}
.hcell.l1{background:#C7D2FE}.hcell.l2{background:#818CF8}.hcell.l3{background:var(--gm-forest)}
.perf-tbl{width:100%;border-collapse:collapse;font-size:11px}
.perf-tbl th{font-weight:800;color:var(--muted);text-align:left;padding:4px 0;border-bottom:2px solid var(--border);font-size:10px;text-transform:uppercase}
.perf-tbl td{padding:8px 0;border-bottom:1px solid #F1F5F9;font-weight:600}
.pbadge{display:inline-block;padding:2px 7px;border-radius:20px;font-weight:800;font-size:10px}
.pbadge.great{background:#F0FDF4;color:#15803D}
.pbadge.ok{background:#FFFBEB;color:#92400E}
.pbadge.needs{background:#FEF2F2;color:#B91C1C}
.insight{background:var(--indigo-light);border-radius:9px;padding:11px 13px;margin-top:9px;border-left:4px solid var(--indigo)}
.insight p{font-size:12px;font-weight:700;color:#4338CA;line-height:1.5}
.student-card{background:var(--surface);border:2px solid var(--border);border-radius:12px;padding:14px;margin-bottom:10px;cursor:pointer;transition:.2s}
.student-card:hover{border-color:var(--indigo);background:#E0E7FF;box-shadow:0 0 0 3px rgba(99,102,241,0.25)}
.student-card.selected{border-color:var(--indigo);background:#E0E7FF;box-shadow:0 0 0 3px rgba(99,102,241,0.25)}
.student-name{font-size:15px;font-weight:900;margin-bottom:2px}
.student-meta{font-size:12px;color:var(--muted);font-weight:600}
.loading-spinner{text-align:center;padding:40px;color:var(--muted);font-weight:700;font-size:14px}
.hcard{background:var(--surface);border:2px solid var(--border);border-radius:12px;padding:12px 14px;margin-bottom:8px;display:flex;align-items:flex-start;gap:10px}
.hcard-left{flex:1;min-width:0}
.hcard-q{font-size:13px;font-weight:700;color:var(--text);margin-bottom:4px;line-height:1.4}
.hcard-meta{font-size:11px;color:var(--muted);font-weight:600;display:flex;gap:8px;flex-wrap:wrap}
.hcard-right{display:flex;flex-direction:column;align-items:flex-end;gap:4px;flex-shrink:0}
.hcard-rating{padding:3px 10px;border-radius:20px;font-size:11px;font-weight:900}
.hcard-due{font-size:10px;font-weight:700;color:var(--muted);text-align:right}
.rating-again{background:#FAF5FF;color:var(--again)}
.rating-hard{background:#FEF2F2;color:var(--hard)}
.rating-good{background:#FFFBEB;color:var(--ok)}
.rating-easy{background:#F0FDF4;color:var(--good)}

/* ============================================================
   UTILITIES
============================================================ */
.hidden { display: none !important; }
.text-center { text-align: center; }

/* ============================================================
   LAYOUT
============================================================ */

.screen {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes gmSkeleton { 0%{background-position:200% 0} 100%{background-position:-200% 0} }

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pop {
  0% { transform: scale(0.9); opacity: 0; }
  70% { transform: scale(1.05); }
  100% { transform: scale(1); opacity: 1; }
}

/* ============================================================
   COMPONENTS
============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all 0.15s ease;
  text-decoration: none;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--ss-green);
  color: white;
  box-shadow: 0 4px 16px rgba(0,200,150,0.3);
}
.btn-primary:hover { background: var(--ss-green-dark); box-shadow: 0 6px 20px rgba(0,200,150,0.4); }

.btn-blue {
  background: var(--ss-blue);
  color: white;
  box-shadow: 0 4px 16px rgba(79,142,247,0.3);
}
.btn-blue:hover { background: var(--ss-blue-dark); }

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 2px solid var(--border);
}
.btn-outline:hover { border-color: var(--ss-green); color: var(--ss-green); }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 10px 16px;
}
.btn-ghost:hover { background: var(--bg); color: var(--text); }

.btn-lg { padding: 18px 32px; font-size: 17px; border-radius: var(--radius); }
.btn-sm { padding: 8px 16px; font-size: 13px; border-radius: 8px; }
.btn-full { width: 100%; }

.btn-grade-again { background: #FF4757; color: white; flex: 1; }
.btn-grade-hard { background: #FF8C42; color: white; flex: 1; }
.btn-grade-good { background: var(--ss-blue); color: white; flex: 1; }
.btn-grade-easy { background: var(--ss-green); color: white; flex: 1; }

.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.input {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 15px;
  color: var(--text);
  background: white;
  transition: border-color 0.15s;
  outline: none;
}
.input:focus { border-color: var(--border-focus); }
.input::placeholder { color: var(--text-light); }

textarea.input { resize: vertical; min-height: 100px; }

.label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}
.pill-green { background: #DCFCE7; color: #15803D; }
.pill-blue { background: #DBEAFE; color: #1D4ED8; }
.pill-purple { background: #F3E8FF; color: var(--gm-forest); }
.pill-orange { background: #FEF3C7; color: #B45309; }
.pill-red { background: #FEE2E2; color: #991B1B; }

/* ============================================================
   TOP BAR (in-screen header for back-button screens)
============================================================ */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: white;
  border-bottom: 1px solid var(--border);
}

.top-bar-title {
  font-size: 18px;
  font-weight: 800;
}

/* ============================================================
   AUTH SCREENS
============================================================ */
#screen-auth {
  background: white;
  min-height: 100vh;
  max-width: 100%;
  padding: 0;
}

.auth-hero {
  background: linear-gradient(135deg, #00C896 0%, #4F8EF7 100%);
  padding: 60px 32px 40px;
  text-align: center;
  color: white;
}

.auth-logo {
  font-size: 32px;
  font-weight: 900;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.auth-tagline {
  font-size: 16px;
  opacity: 0.9;
  font-weight: 600;
}

.auth-body {
  padding: 32px 24px;
  flex: 1;
}

.auth-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 28px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 4px;
}

.auth-tab {
  flex: 1;
  padding: 10px;
  border-radius: 8px;
  border: none;
  background: transparent;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.15s;
}

.auth-tab.active {
  background: white;
  color: var(--text);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.role-selector {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
  margin-bottom: 24px;
}

.role-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 16px 8px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  background: white;
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--font);
}

.role-btn.active {
  border-color: var(--ss-green);
  background: #F0FDF9;
}

.role-btn-icon { font-size: 24px; }
.role-btn-label { font-size: 13px; font-weight: 700; color: var(--text); }

.form-group {
  margin-bottom: 16px;
}

.select {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 15px;
  color: var(--text);
  background: white;
  outline: none;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
}
.select:focus { border-color: var(--border-focus); }

/* ============================================================
   HOME SCREEN
============================================================ */
.home-content {
  padding: 20px 20px 20px;
}

.streak-bar {
  background: linear-gradient(135deg, #FF7043, #FF4757);
  border-radius: var(--radius);
  padding: 16px 20px;
  color: white;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.streak-number {
  font-size: 32px;
  font-weight: 900;
  line-height: 1;
}

.streak-label { font-size: 13px; font-weight: 600; opacity: 0.9; }
.streak-icon { font-size: 40px; }

.xp-bar-wrap {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}

.xp-level {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.xp-track {
  height: 10px;
  background: var(--bg);
  border-radius: 99px;
  overflow: hidden;
}

.xp-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--ss-blue), var(--ss-purple));
  border-radius: 99px;
  transition: width 0.6s cubic-bezier(0.4,0,0.2,1);
}

.section-title {
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.study-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 24px;
}

.study-option {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  cursor: pointer;
  box-shadow: var(--shadow);
  border: 2px solid transparent;
  transition: all 0.2s ease;
  text-align: left;
}

.study-option:hover {
  border-color: var(--ss-green);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.1);
}

.study-option-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.study-option-title {
  font-size: 15px;
  font-weight: 800;
  color: var(--text);
}

.study-option-desc {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 600;
  line-height: 1.4;
}

.today-topic-card {
  background: linear-gradient(135deg, var(--ss-blue) 0%, var(--ss-purple) 100%);
  border-radius: var(--radius);
  padding: 20px;
  color: white;
  margin-bottom: 20px;
  cursor: pointer;
}

.today-topic-label { font-size: 12px; font-weight: 700; opacity: 0.8; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 4px; }
.today-topic-name { font-size: 20px; font-weight: 800; margin-bottom: 4px; }
.today-topic-sub { font-size: 13px; opacity: 0.85; font-weight: 600; }

.topic-pills {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.weekly-activity {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}

.activity-days {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.activity-day {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.activity-dot {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--bg);
}

.activity-dot.done { background: var(--ss-green); }
.activity-dot.today { background: var(--bg); border: 2px solid var(--ss-green); }
.activity-day-label { font-size: 10px; font-weight: 700; color: var(--text-light); text-transform: uppercase; }

.ai-tutor-btn {
  background: linear-gradient(135deg, #FF6B9D, #8B5CF6);
  border-radius: var(--radius);
  padding: 20px;
  color: white;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  margin-bottom: 20px;
  box-shadow: 0 4px 20px rgba(139,92,246,0.3);
  transition: transform 0.15s;
}

.ai-tutor-btn:hover { transform: translateY(-2px); }

.ai-tutor-text { font-size: 16px; font-weight: 800; }
.ai-tutor-sub { font-size: 12px; opacity: 0.85; font-weight: 600; margin-top: 2px; }