:root{
  --navy:#0b1730;--navy2:#152a4d;
  --blue:#2563eb;--blue-hover:#1d4ed8;--bluelight:#eff6ff;
  --gold:#f59e0b;
  --bg:#f3f5fa;--white:#fff;
  --text:#111c33;--muted:#64748b;--line:#e5eaf2;
  --green:#059669;--greens:#ecfdf5;
  --red:#dc2626;--reds:#fef2f2;
  --amber:#b45309;--ambers:#fffbeb;
  --shadow-sm:0 1px 3px #0f172a0d,0 1px 2px #0f172a08;
  --shadow-md:0 8px 24px #0f172a0f,0 2px 6px #0f172a08;
  --radius:14px;--radius-sm:10px;--radius-lg:20px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  color:var(--text);background:var(--bg);margin:0;line-height:1.6;
  font-size: 18px; 
  -webkit-font-smoothing:antialiased}
  
button,input,select,textarea{font:inherit}
button{cursor:pointer;transition:all .18s ease}
button:disabled{cursor:not-allowed;opacity:.5}
button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #93c5fd;outline-offset:2px}
[hidden]{display:none!important}
body.auth-locked > :not(#authOverlay),
body.auth-locked #appHeader,
body.auth-locked main,
body.auth-locked #appFooter{display:none!important}
#authOverlay{position:fixed;inset:0;z-index:10000;display:flex;align-items:center;justify-content:center;
  padding:24px;background:rgba(11,23,48,.96)}
#gradeSelectionOverlay{position:fixed;inset:0;z-index:10000;display:flex;align-items:center;justify-content:center;
  padding:24px;background:rgba(11,23,48,.96)}
.question-load-error-overlay{position:fixed;inset:0;z-index:11000;display:flex;align-items:center;justify-content:center;
  padding:24px;background:rgba(11,23,48,.96)}
.auth-card{width:min(100%,460px);padding:38px;background:var(--white);border:1px solid var(--line);
  border-radius:var(--radius-lg);box-shadow:0 24px 70px #0005;text-align:center}
.question-load-error-card{width:min(100%,520px);padding:38px;background:var(--white);border:1px solid #fecaca;
  border-radius:var(--radius-lg);box-shadow:0 24px 70px #0005;text-align:center}
.question-load-error-card h1{margin:0 0 12px;color:var(--red);font-size:28px}
.question-load-error-card p{margin:0;color:var(--text);font-weight:700}
.grade-selection-card{width:min(100%,480px);padding:38px;background:var(--white);border:1px solid var(--line);
  border-radius:var(--radius-lg);box-shadow:0 24px 70px #0005;text-align:center}
.grade-selection-card h1{margin:0 0 12px;font-size:30px}
.grade-selection-card p{margin:0 0 24px;color:var(--muted)}
.grade-selection-label{display:block;margin:0 0 8px;color:var(--text);font-size:15px;font-weight:750;text-align:left}
.grade-selection-card select{margin-bottom:20px;text-align:left}
.auth-card h1{margin-bottom:12px;font-size:30px}
.auth-card p{margin-bottom:24px;color:var(--muted)}
.auth-card .btn{min-height:56px}
.google-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  background-color: #ffffff;
  color: #3c4043;
  border: 1px solid #dadce0;
  border-radius: 8px;
  padding: 12px 24px;
  font-family: 'Roboto', Arial, sans-serif;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s, box-shadow 0.2s;
  margin-top: 20px;
}

.google-btn:hover {
  background-color: #f8f9fa;
  box-shadow: 0 1px 2px rgba(60,64,67,0.3), 0 1px 3px 1px rgba(60,64,67,0.15);
}
.auth-error{margin-top:16px;padding:12px;border:1px solid #fecaca;border-radius:var(--radius-sm);
  background:var(--reds);color:#991b1b;text-align:left;overflow-wrap:anywhere}
.auth-logout{padding:6px 10px;font-size:13px}
h1,h2,h3,p{margin-top:0}
h1,h2,h3{line-height:1.3;font-weight:800;letter-spacing:-.02em}
h1{font-size:clamp(32px,4vw,48px)}
h2{font-size:clamp(26px,3vw,34px)}
h3{font-size:22px}
p{margin-bottom:16px}
.container{max-width:1220px;padding:0 23px;margin:auto}
.small{font-size:16px}.muted{color:var(--muted)}.blue{color:var(--blue)}.semi{font-weight:750}
.eyebrow{color:var(--blue);font-size:14px;font-weight:850;text-transform:uppercase;letter-spacing:1.8px}

/* Botones */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:var(--radius-sm);border:1px solid transparent;
  padding:14px 22px;font-size:16px;font-weight:800;line-height:1.4;
  text-decoration:none;transition:all .18s ease;white-space:nowrap}
.btn:hover:not(:disabled){transform:translateY(-1px)}
.btn-main{background:linear-gradient(180deg,#2563eb,#1d4ed8);color:#fff;
  box-shadow:0 4px 12px #2563eb33,inset 0 1px 0 #ffffff2b}
.btn-main:hover:not(:disabled){background:linear-gradient(180deg,#1d4ed8,#1e40af);
  box-shadow:0 6px 18px #2563eb4d}
.btn-soft{color:#1e40af;background:#eef2ff;border-color:#dbeafe}
.btn-soft:hover:not(:disabled){background:#e0e7ff}
.btn-light{background:#f1f5f9;color:#334155;border-color:var(--line)}
.btn-light:hover:not(:disabled){background:#e2e8f0}
.btn-outline{background:#fff;color:var(--blue);border-color:#bfdbfe}
.btn-danger{background:var(--reds);color:var(--red);border-color:#fecaca; font-weight: 800;}
.btn-danger:hover:not(:disabled){background:#fee2e2; color: #991b1b;}
.btn-full{width:100%}

/* Tarjetas y utilidades */
.card{background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-sm);
  border-radius:var(--radius);padding:28px;transition:box-shadow .25s ease,border-color .25s ease}
.card:hover{box-shadow:var(--shadow-md);border-color:#d7e0ee}
.small-label{display:block;color:#475569;font-weight:800;font-size:15px;margin-bottom:10px}
.input{width:100%;min-height:50px;padding:14px 16px;border-radius:var(--radius-sm);
  border:1px solid #d8e0ec;background:#fff;color:#0f172a;font-size:16px;
  transition:border-color .18s ease,box-shadow .18s ease}
.input:focus{border-color:var(--blue);outline:none;box-shadow:0 0 0 3px #2563eb1f}
.divider{height:1px;background:var(--line);margin:24px 0}
.flex{display:flex;align-items:center;gap:12px}
.between{display:flex;justify-content:space-between;align-items:center;gap:14px}
.wrap{flex-wrap:wrap}.no-margin{margin:0}
.note{background:#eff6ff;border:1px solid #dbeafe;color:#1e40af;
  font-size:16px;line-height:1.6;border-radius:var(--radius-sm);padding:16px 18px}
.notice-warn{background:var(--ambers);color:#92400e;border:1px solid #fde68a}
.badge{display:inline-block;border-radius:7px;padding:6px 12px;font-size:13px;
  font-weight:850;background:var(--bluelight);color:#1e40af;white-space:nowrap}
.badge.overdue{background:var(--reds);color:var(--red)}
.badge.today{background:var(--greens);color:var(--green)}
.badge.gray{background:#f1f5f9;color:#64748b}
.bar{height:14px;background:#e7edf5;border-radius:99px;overflow:hidden}
.bar>span{height:100%;display:block;background:linear-gradient(90deg,#3b82f6,#2563eb);
  border-radius:99px;transition:width .35s cubic-bezier(.4,0,.2,1)}

/* Pantallas */
.screen{display:none;animation:fade .25s ease}
.screen.active{display:block}
@keyframes fade{from{opacity:.7;transform:translateY(4px)}to{opacity:1;transform:none}}

/* Header */
header#appHeader{position:sticky;top:0;z-index:30;background:#fffffff2;
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line)}
.header-row{min-height:85px;display:flex;align-items:center;gap:28px}
.mark{width:44px;height:47px;border-radius:11px;display:grid;place-items:center;
  background:linear-gradient(145deg,#0b1730,#152a4d);color:#fff;font-size:26px;
  box-shadow:0 4px 12px #0b173033,inset 0 1px 0 #ffffff1a}
.brand{display:flex;align-items:center;gap:12px;font-size:22px;letter-spacing:-.6px;
  font-weight:900;white-space:nowrap;color:var(--navy)}
.brand b{color:var(--blue)}
.site-nav{display:flex;align-items:center;gap:8px;flex:1}
.nav-btn{border:0;background:transparent;color:#475569;font-size:16px;
  font-weight:800;padding:12px 16px;border-radius:9px;white-space:nowrap;
  transition:all .18s ease}
.nav-btn:hover{background:#f1f5f9;color:var(--navy);transform:translateY(-1px)}
.nav-btn.active{background:var(--bluelight);color:var(--blue);
  box-shadow:inset 0 0 0 1px #dbeafe}
.user-status{display:flex;align-items:center;gap:10px;
  border:1px solid #dbe3ee;background:#f8fafc;border-radius:11px;
  padding:10px 16px;font-size:16px;font-weight:800;color:#1e3a8a;white-space:nowrap;max-width:25vw}
#currentUsername{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.icon-btn{background:none;border:0;font-size:22px;padding:8px;border-radius:8px;
  cursor:pointer;transition:background .15s ease;line-height:1}
.icon-btn:hover{background:#f1f5f9}
main{padding-top:30px;padding-bottom:65px;min-height:82vh}

/* Dashboard y KPIs */
.hero{background:linear-gradient(115deg,#0b1730 10%,#152a4d 60%,#1e3a8a);
  color:#fff;border-radius:22px;padding:42px 48px;
  display:grid;grid-template-columns:1fr auto;align-items:center;gap:30px;
  position:relative;overflow:hidden;box-shadow:0 20px 50px #0b173033,inset 0 1px 0 #ffffff1a}
.hero:after{content:"";position:absolute;right:-80px;top:-95px;
  width:420px;height:420px;border:1px solid #93c5fd22;border-radius:50%;pointer-events:none}
.hero .eyebrow{color:var(--gold)}
.hero h1{font-size:clamp(34px,4.5vw,52px);margin:14px 0}
.hero p{max-width:700px;color:#cbd5e1;font-size:18px;line-height:1.8}
.hero .datebox{position:relative;z-index:1;background:#ffffff12;
  border:1px solid #ffffff2c;border-radius:16px;padding:24px 28px;min-width:270px}
.hero .datebox strong{display:block;font-size:50px;font-weight:900;line-height:1.1;color:var(--gold)}
.hero .datebox span{font-size:16px;color:#cbd5e1}
.hero .datebox label{display:block;font-size:15px;margin:18px 0 10px;color:#cbd5e1}
.hero input[type=date]{background:#fff;color:#0f172a;width:100%;
  border-radius:8px;border:0;padding:12px;font-size:16px}
.hero .datebox .btn{width:100%;margin-top:14px;font-size:16px}
.kpi-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin:22px 0 32px}
.kpi{padding:24px;background:#fff;border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow-sm);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease}
.kpi:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:#dbe3ee}
.kpi .iconbox{display:inline-grid;place-items:center;width:42px;height:42px;
  border-radius:10px;background:var(--bluelight);color:var(--blue);
  font-size:22px;margin-bottom:14px}
.kpi .num{font-size:38px;font-weight:900;letter-spacing:-.8px;color:var(--navy);line-height:1.1}
.kpi .lab{color:var(--muted);font-size:15px;font-weight:700;margin-top:8px;line-height:1.4}
.dashboard-grid{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(340px,.85fr);gap:24px}
.daily-target{background:linear-gradient(160deg,#f8fbff,#eff6ff);
  border:1px solid #dbeafe;border-radius:var(--radius-sm);
  display:grid;grid-template-columns:1fr 1fr;gap:14px;padding:22px;margin:22px 0}
.daily-target strong{font-size:42px;line-height:1.1;display:block;color:var(--navy)}
.daily-target span{font-size:15px;color:var(--muted)}
.daily-target .numgreen{color:var(--green)}
.sub-grid{display:grid;gap:14px}
.subject-mini{display:grid;grid-template-columns:1fr auto;gap:10px;
  padding:16px 0;border-bottom:1px solid var(--line);transition:padding-left .18s ease}
.subject-mini:hover{padding-left:6px}
.subject-mini:last-child{border:0}
.subject-mini .subject-name{font-size:17px;font-weight:850;color:#1e293b}
.subject-mini .subject-stat{font-size:15px;color:var(--muted);margin-top:6px}
.subject-mini .tag{font-size:15px;font-weight:850;color:var(--blue)}
.seven-days{display:grid;gap:12px;margin-top:16px}
.day-row{display:flex;align-items:center;gap:14px;justify-content:space-between;
  padding:15px 16px;border:1px solid var(--line);border-radius:var(--radius-sm);
  font-size:16px;transition:all .18s ease;background:#fff}
.day-row:hover{border-color:#cbd5e1;background:#fafbff;transform:translateX(2px)}
.day-row.current{background:linear-gradient(90deg,#eff6ff,#f8fbff);border-color:#bfdbfe}
.day-row strong{font-size:16px;color:var(--navy)}
.day-row span{color:var(--muted);font-size:15px}
.day-row b{color:#1e40af;font-weight:800}
.progress-note{font-size:15px;color:var(--muted);display:flex;
  justify-content:space-between;gap:10px;margin:12px 0 10px}

/* Nota y gráficos */
.grade-card{margin:24px 0;background:linear-gradient(135deg,#f0f9ff 0%,#eff6ff 100%);
  border:1px solid #bfdbfe;border-radius:20px;padding:34px;
  display:grid;grid-template-columns:auto 1fr;gap:40px;align-items:center;
  box-shadow:0 8px 24px #2563eb14,inset 0 1px 0 #ffffff;transition:box-shadow .25s ease,transform .25s ease}
.grade-card:hover{box-shadow:0 14px 34px #2563eb24;transform:translateY(-1px)}
.grade-main{text-align:center;padding-right:36px;border-right:1px solid #bfdbfe;min-width:220px}
.grade-label{font-size:15px;font-weight:850;text-transform:uppercase;letter-spacing:1.5px;color:#2563eb;margin-bottom:12px}
.grade-value{font-size:84px;font-weight:900;line-height:1;color:#1e40af;letter-spacing:-2px;font-variant-numeric:tabular-nums}
.grade-scale{font-size:26px;color:#64748b;margin-top:8px;font-weight:700}
.grade-badge{display:inline-block;margin-top:18px;padding:10px 20px;border-radius:99px;font-size:15px;font-weight:850;transition:all .2s ease;letter-spacing:.3px}
.grade-badge.excellent{background:#dcfce7;color:#166534;box-shadow:0 2px 8px #22c55e2e}
.grade-badge.pass     {background:#dbeafe;color:#1e40af;box-shadow:0 2px 8px #3b82f62e}
.grade-badge.warn     {background:#fef3c7;color:#92400e;box-shadow:0 2px 8px #f59e0b2e}
.grade-badge.risk     {background:#fee2e2;color:#991b1b;box-shadow:0 2px 8px #ef44442e}
.grade-badge.neutral  {background:#f1f5f9;color:#475569}
.grade-details{display:grid;gap:8px}
.grade-row{display:flex;justify-content:space-between;align-items:center;font-size:17px;padding:12px 0;border-bottom:1px dashed #dbeafe}
.grade-row:last-of-type{border-bottom:0}
.grade-row span{color:#475569;font-weight:600}
.grade-row strong{color:#1e293b;font-weight:800;font-variant-numeric:tabular-nums}
.grade-note{font-size:15px;color:#64748b;margin-top:14px;line-height:1.6;font-style:italic;padding:12px 16px;background:#ffffffee;border-radius:8px;border:1px solid #e0edff}
.grade-chart{width:100%;height:auto;display:block;margin:18px 0 10px}
.chart-header{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;flex-wrap:wrap;margin-bottom:10px}
.chart-title{font-size:18px;font-weight:850;color:var(--navy);letter-spacing:-.2px}
.chart-subtitle{font-size:15px;color:var(--muted);margin-top:6px}
.chart-trend{font-size:15px;font-weight:800;padding:8px 16px;border-radius:99px;white-space:nowrap}
.chart-trend.trend-up{background:#dcfce7;color:#166534}
.chart-trend.trend-down{background:#fee2e2;color:#991b1b}
.chart-trend.trend-stable{background:#f1f5f9;color:#475569}
.chart-legend{display:flex;gap:24px;font-size:15px;color:var(--muted);flex-wrap:wrap;margin-top:10px;padding-top:14px;border-top:1px solid var(--line)}
.chart-legend span{display:flex;align-items:center;gap:8px}
.legend-dot{display:inline-block;width:14px;height:14px;border-radius:50%}
.legend-dash{display:inline-block;width:20px;height:0;border-top:2px dashed #f59e0b}

/* Switch Simple/Avanzado */
.view-switch{display:flex;align-items:center;justify-content:flex-end;gap:16px;margin-bottom:24px}
.view-switch-label{font-size:16px;font-weight:800;color:#94a3b8;transition:color .2s ease;cursor:pointer;user-select:none}
.view-switch-label.active{color:var(--blue)}
.switch{position:relative;display:inline-block;cursor:pointer}
.switch input{opacity:0;width:0;height:0;position:absolute}
.switch-track{display:block;width:60px;height:34px;background:#cbd5e1;border-radius:99px;transition:background .22s ease;position:relative}
.switch-thumb{position:absolute;top:4px;left:4px;width:26px;height:26px;background:#fff;border-radius:50%;box-shadow:0 1px 3px #0003;transition:transform .22s ease}
.switch input:checked + .switch-track{background:var(--blue)}
.switch input:checked + .switch-track .switch-thumb{transform:translateX(26px)}

/* Vista Minimal */
.minimal-grade-card{display:flex;justify-content:center;align-items:center;gap:3vw;padding:4vh 3vw;background:linear-gradient(135deg,#eff6ff 0%,#dbeafe 100%);border:1px solid #bfdbfe;border-radius:24px;margin-bottom:32px;box-shadow:0 8px 24px #2563eb14,inset 0 1px 0 #ffffff}
.minimal-grade-copy{flex:0 1 24%;min-width:0;text-align:right}
.minimal-grade-label{font-size:clamp(.8rem,1.2vw,1rem);font-weight:850;text-transform:uppercase;letter-spacing:1.8px;color:#2563eb;margin-bottom:8px;line-height:1.35}
.minimal-grade-value{font-size:clamp(4rem,8vw,6rem);font-weight:900;line-height:1;color:#1e40af;letter-spacing:-3px;font-variant-numeric:tabular-nums}
.minimal-grade-scale{font-size:clamp(.9rem,1.5vw,1.3rem);color:#64748b;font-weight:700;margin-top:0}
.minimal-grade-details{flex:0 1 24%;min-width:0;text-align:left}
.minimal-grade-badge{display:inline-block;margin-top:0;padding:8px 14px;border-radius:99px;font-size:clamp(.75rem,1vw,.9rem);font-weight:850}
.minimal-grade-badge.excellent{background:#dcfce7;color:#166534}
.minimal-grade-badge.pass{background:#dbeafe;color:#1e40af}
.minimal-grade-badge.warn{background:#fef3c7;color:#92400e}
.minimal-grade-badge.risk{background:#fee2e2;color:#991b1b}
.minimal-grade-badge.neutral{background:#f1f5f9;color:#475569}
.minimal-grade-sub{font-size:14px;color:#64748b;margin-top:10px;overflow-wrap:anywhere}
.minimal-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:2vw;align-items:stretch}
.minimal-card{background:#fff;border:2px solid var(--line);border-radius:20px;padding:3vh 2vw;text-align:center;cursor:pointer;transition:all .22s ease;font-family:inherit;color:inherit}
.minimal-card:hover{border-color:var(--blue);box-shadow:0 12px 28px #2563eb1f;transform:translateY(-4px)}
.minimal-card:active{transform:translateY(-1px)}
.minimal-card-icon{font-size:clamp(2.5rem,5vw,3.5rem);margin-bottom:16px}
.minimal-card-title{font-size:clamp(1.1rem,2vw,1.4rem);font-weight:850;color:var(--navy);margin-bottom:12px}
.minimal-card-count{font-size:17px;color:var(--muted);margin-bottom:22px;min-height:24px}
.minimal-card-cta{font-size:17px;font-weight:850;color:var(--blue)}
.minimal-subjects-list{display:grid;gap:14px}
.minimal-subject-row{display:flex;align-items:center;gap:18px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px 24px;transition:all .2s ease}
.minimal-subject-row:hover{border-color:var(--blue);box-shadow:0 4px 14px #2563eb14}
.minimal-subject-row .info{flex:1;min-width:0}
.minimal-subject-row .name{font-size:18px;font-weight:800;color:var(--navy);margin-bottom:6px}
.minimal-subject-row .meta{font-size:15px;color:var(--muted)}
.minimal-subject-row .pending{font-size:16px;font-weight:850;color:var(--blue);background:#eff6ff;padding:8px 14px;border-radius:8px;white-space:nowrap}

/* Sesiones de estudio */
.session-shell{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:24px;align-items:start}
.question-panel{min-height:450px}
.question-meta{font-weight:850;font-size:15px;letter-spacing:1px;color:var(--blue);text-transform:uppercase;margin:28px 0 14px}
.question-panel h2{font-size:26px;line-height:1.6;margin-bottom:28px;white-space:pre-wrap}
.options{display:grid;gap:14px}
.option{display:flex;gap:18px;align-items:center;text-align:left;width:100%;background:#fff;color:#1e293b;border:1px solid #dce4ef;border-radius:var(--radius-sm);padding:20px 22px;font-size:20px;line-height:1.6;min-height:70px;transition:all .18s ease}
.option:hover:not(:disabled){border-color:#93c5fd;background:#f8fbff;transform:translateX(3px)}
.option .letter{display:grid;place-items:center;flex:none;width:40px;height:40px;border-radius:8px;background:#f1f5f9;font-size:18px;font-weight:850;color:#475569}
.option.correct{background:var(--greens);border-color:#6ee7b7;color:#065f46}
.option.correct .letter{background:#a7f3d0;color:#065f46}
.option.incorrect{background:var(--reds);border-color:#fca5a5;color:#991b1b}
.option.incorrect .letter{background:#fecaca;color:#991b1b}

/* BARRA LATERAL STICKY Y FEEDBACK */
.session-side {
  position: sticky;
  top: 100px;
  background: #f8fafc; 
}
.answer-feedback {
  background: var(--greens);
  border: 1px solid #a7f3d0;
  border-radius: var(--radius-sm);
  color: #065f46;
  margin: 0;
  padding: 20px;
  font-size: 17px;
  line-height: 1.6;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.answer-feedback.bad {
  background: var(--reds);
  border-color: #fecaca;
  color: #991b1b;
}
.feedback-head {
  font-size: 20px;
  font-weight: 850;
  margin-bottom: 10px;
}
.session-action-row{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-top:28px;flex-wrap:wrap}
.session-side h3{font-size:19px}
.tag-small{font-size:14px;color:var(--muted);font-weight:650}
.summary-score{font-size:80px;line-height:1.1;color:var(--blue);font-weight:900;text-align:center;margin:20px 0 8px}
.summary-card{max-width:760px;margin:0 auto;text-align:center;padding:46px 38px}
.summary-card .goal-line{text-align:left}

/* Tablas y listas */
.goal-line{display:flex;gap:16px;flex-wrap:wrap;margin:20px 0}
.goal-pill{background:#f8fafc;border:1px solid var(--line);border-radius:var(--radius-sm);padding:18px 20px;min-width:180px;flex:1;transition:all .18s ease}
.goal-pill:hover{border-color:#cbd5e1;background:#fff;box-shadow:var(--shadow-sm)}
.goal-pill strong{font-size:28px;display:block;color:var(--navy)}
.goal-pill span{font-size:15px;color:var(--muted)}
.subject-plan-table{width:100%;border-collapse:collapse}
.subject-plan-table th,.subject-plan-table td{padding:16px 12px;border-bottom:1px solid var(--line);text-align:left;font-size:17px}
.subject-plan-table th{color:var(--muted);font-weight:800;font-size:15px}
.subject-plan-table td{font-weight:650}
.subject-plan-table tr:hover td{background:#fafbff}
.subject-plan-table tr:last-child td{border-bottom:0}
.overdue-list{display:grid;gap:12px;margin:22px 0}
.due-item{border:1px solid var(--line);border-radius:var(--radius-sm);padding:18px 20px;display:grid;grid-template-columns:1fr auto;gap:14px;align-items:start;background:#fff;transition:all .18s ease}
.due-item:hover{border-color:#bfdbfe;box-shadow:0 4px 12px #2563eb0f;transform:translateY(-1px)}
.due-item h4{margin:12px 0 6px;font-size:17px;font-weight:800;line-height:1.6;color:#1e293b}
.due-item .meta{font-size:15px;color:var(--muted)}
.due-item .time{font-size:15px;color:var(--blue);white-space:nowrap;font-weight:700}

/* Materias */
.subject-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.subject-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:all .2s ease}
.subject-card:hover{border-color:#cbd5e1;box-shadow:var(--shadow-md);transform:translateY(-2px)}
.subject-card.chosen{border-color:#bfdbfe;background:linear-gradient(160deg,#fbfdff,#f5f9ff)}
.subject-title{display:flex;gap:14px;align-items:flex-start;justify-content:space-between}
.subject-title label{display:flex;gap:14px;align-items:flex-start;cursor:pointer;min-width:0;flex:1}
.subject-title input{accent-color:var(--blue);width:22px;height:22px;margin:2px 0 0;flex:none;cursor:pointer}
.subject-title strong{font-size:17px;font-weight:800;line-height:1.5;color:#0f172a}
.subject-meta{font-size:15px;color:var(--muted);margin:14px 0}
.subject-foot{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:16px;flex-wrap:wrap}
.subject-foot .btn{padding:10px 16px;font-size:15px}

/* Banco de preguntas */
.search-bar{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:16px;margin:24px 0 20px}
.bank-item{border:1px solid var(--line);background:#fff;border-radius:var(--radius-sm);padding:22px 24px;margin-bottom:14px;transition:all .18s ease}
.bank-item:hover{border-color:#cbd5e1;box-shadow:var(--shadow-sm)}
.bank-item h3{font-size:18px;line-height:1.6;white-space:pre-wrap;margin:16px 0}
.bank-item summary{color:var(--blue);font-size:16px;font-weight:800;cursor:pointer}
.bank-item ol{padding-left:26px;font-size:17px;line-height:1.8}
.bank-item li{padding:6px 0}
.bank-item li.correct{font-weight:850;color:var(--green)}
.pagination{display:flex;justify-content:space-between;align-items:center;gap:14px;margin:24px 0}
.history-table{border-collapse:collapse;width:100%;min-width:540px}
.history-table th,.history-table td{border-bottom:1px solid var(--line);text-align:left;padding:16px;font-size:16px}
.history-table th{font-size:15px;color:var(--muted)}
.history-table tr:hover td{background:#fafbff}
.scroll-table{overflow-x:auto}
.empty{border:1px dashed #cbd5e1;border-radius:var(--radius-sm);color:var(--muted);font-size:17px;line-height:1.6;padding:36px;text-align:center;background:#fff}
.backup{display:flex;gap:12px;flex-wrap:wrap}
.file-picker{cursor:pointer}
#fileBackup,#fileQuestions{display:none}

/* Pie de página y notificaciones */
footer{background:#fff;border-top:1px solid var(--line);padding:26px 0;font-size:15px;color:#64748b}
.footrow{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
#toast{position:fixed;z-index:100;bottom:28px;right:28px;width:min(420px,calc(100vw - 40px));display:none;background:#0b1730;color:#fff;padding:18px 22px;box-shadow:0 15px 40px #0b173059;border-radius:12px;font-size:17px;font-weight:600;text-align:center;}
#toast.active{display:block}

/* Panel de Ajustes */
.drawer{position:fixed;inset:0;z-index:60}
.drawer-overlay{position:absolute;inset:0;background:#0b173066;animation:fadeIn .22s ease}
.drawer-panel{position:absolute;top:0;right:0;bottom:0;width:min(400px,100%);background:#fff;box-shadow:-20px 0 50px #0b173029;display:flex;flex-direction:column;animation:slideIn .28s cubic-bezier(.4,0,.2,1)}
.drawer-header{display:flex;justify-content:space-between;align-items:center;padding:24px 28px;border-bottom:1px solid var(--line)}
.drawer-header h3{margin:0;font-size:21px}
.drawer-body{padding:28px;overflow-y:auto;flex:1}
.setting-group{margin-bottom:28px}
.setting-group > label{display:block;font-size:15px;font-weight:850;text-transform:uppercase;letter-spacing:1.2px;color:var(--muted);margin-bottom:14px}
.setting-toggle-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.setting-toggle-option{padding:16px;border-radius:10px;border:2px solid var(--line);background:#fff;font-size:17px;font-weight:800;color:var(--muted);cursor:pointer;transition:all .18s ease;font-family:inherit}
.setting-toggle-option:hover{border-color:#93c5fd;color:var(--blue)}
.setting-toggle-option.active{border-color:var(--blue);background:#eff6ff;color:var(--blue)}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes slideIn{from{transform:translateX(100%)}to{transform:translateX(0)}}

/* Responsive (Móviles y Tablets) */
@media(max-width:1100px){
  .header-row{flex-wrap:wrap;gap:14px;padding:14px 0}
  .site-nav{order:3;flex-basis:100%;overflow:auto}
  .user-status{margin-left:auto}
  .dashboard-grid{grid-template-columns:1fr}
  .nav-btn{padding:10px 14px}
}
@media(max-width:780px){
  .hero{grid-template-columns:1fr;padding:28px}
  .hero .datebox{max-width:380px}
  .kpi-grid{grid-template-columns:repeat(2,1fr);gap:14px}
  .subject-list{grid-template-columns:1fr}
  .session-shell{grid-template-columns:1fr} 
  .session-side { position: static; }
  .search-bar{grid-template-columns:1fr}
  .minimal-subject-row{flex-wrap:wrap}
  .grade-card{grid-template-columns:1fr;gap:26px;padding:28px}
  .grade-main{padding-right:0;border-right:0;border-bottom:1px solid #bfdbfe;padding-bottom:24px}
  .grade-value{font-size:72px}
  .option { font-size: 18px; padding: 16px; } 
}
@media(max-width:490px){
  .container{padding:0 16px}main{padding-top:18px}
  .minimal-grade-card{flex-wrap:wrap;gap:1.5vh 3vw;padding:2.5vh 2vw}
  .minimal-grade-copy{flex:1 1 25%;text-align:center}
  .minimal-grade-details{flex:1 1 100%;text-align:center}
  .hero{padding:28px 24px;border-radius:17px}
  .hero h1{font-size:34px}
  .card{padding:22px}
  .kpi{padding:18px}
  .kpi .num{font-size:28px}
  .goal-pill{min-width:140px;padding:14px}
  .question-panel h2{font-size:22px}
  .hide-mobile{display:none}
}