/* ════════════════════════════════════════════════════════════════════
   k12.css — Age-Adaptive K-12 Learning Platform Styles
   Segments: primary (1-5) | middle (6-8) | secondary (9-10) | senior (11-12)
   ════════════════════════════════════════════════════════════════════ */

/* ── CSS Custom Properties per segment ──────────────────────────────── */
[data-segment="primary"] {
    --k12-accent:      #f59e0b;
    --k12-accent2:     #fbbf24;
    --k12-bg:          #fffbeb;
    --k12-hero-from:   #451a03;
    --k12-hero-to:     #78350f;
    --k12-hero-glow:   rgba(245,158,11,.22);
    --k12-font-size:   1.05rem;
    --k12-radius:      1.4rem;
    --k12-card-bg:     #fff;
    --k12-card-border: #fcd34d;
    --k12-tag-bg:      rgba(245,158,11,.12);
    --k12-tag-color:   #b45309;
    --k12-prog-color:  #f59e0b;
    --k12-btn-bg:      linear-gradient(135deg,#f59e0b,#d97706);
}
[data-segment="middle"] {
    --k12-accent:      #6366f1;
    --k12-accent2:     #818cf8;
    --k12-bg:          #eef2ff;
    --k12-hero-from:   #0f0c29;
    --k12-hero-to:     #302b63;
    --k12-hero-glow:   rgba(99,102,241,.22);
    --k12-font-size:   1rem;
    --k12-radius:      1.25rem;
    --k12-card-bg:     #fff;
    --k12-card-border: #c7d2fe;
    --k12-tag-bg:      rgba(99,102,241,.12);
    --k12-tag-color:   #4338ca;
    --k12-prog-color:  #6366f1;
    --k12-btn-bg:      linear-gradient(135deg,#6366f1,#4338ca);
}
[data-segment="secondary"] {
    --k12-accent:      #22c55e;
    --k12-accent2:     #4ade80;
    --k12-bg:          #f0fdf4;
    --k12-hero-from:   #052e16;
    --k12-hero-to:     #14532d;
    --k12-hero-glow:   rgba(34,197,94,.2);
    --k12-font-size:   .98rem;
    --k12-radius:      1.1rem;
    --k12-card-bg:     #fff;
    --k12-card-border: #bbf7d0;
    --k12-tag-bg:      rgba(34,197,94,.12);
    --k12-tag-color:   #15803d;
    --k12-prog-color:  #22c55e;
    --k12-btn-bg:      linear-gradient(135deg,#22c55e,#16a34a);
}
[data-segment="senior"] {
    --k12-accent:      #7c3aed;
    --k12-accent2:     #a78bfa;
    --k12-bg:          #f5f3ff;
    --k12-hero-from:   #0f0921;
    --k12-hero-to:     #1e1b4b;
    --k12-hero-glow:   rgba(124,58,237,.2);
    --k12-font-size:   .96rem;
    --k12-radius:      1rem;
    --k12-card-bg:     #fff;
    --k12-card-border: #ddd6fe;
    --k12-tag-bg:      rgba(124,58,237,.1);
    --k12-tag-color:   #6d28d9;
    --k12-prog-color:  #7c3aed;
    --k12-btn-bg:      linear-gradient(135deg,#7c3aed,#4338ca);
}

/* ── Hero ────────────────────────────────────────────────────────────── */
.k12-hub-hero {
    background: linear-gradient(135deg, var(--k12-hero-from,#06030f) 0%, var(--k12-hero-to,#1e1b4b) 100%);
    padding: 3.5rem 0 2.5rem;
    position: relative;
    overflow: hidden;
}
.k12-hub-hero::before {
    content:'';
    position:absolute;inset:0;
    background: radial-gradient(ellipse 55% 60% at 50% 0%, var(--k12-hero-glow,rgba(99,102,241,.2)) 0%, transparent 70%);
    pointer-events:none;
}
.k12-hub-title {
    font-size: clamp(1.6rem, 4vw, 2.6rem);
    font-weight: 900;
    color: #fff;
    margin: .5rem 0 .6rem;
}
.k12-hub-sub {
    color: rgba(255,255,255,.7);
    font-size: .95rem;
    margin: 0;
}

/* ── Segment badge ───────────────────────────────────────────────────── */
.k12-seg-badge {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    padding: .3rem .9rem;
    border-radius: 2rem;
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .05em;
    text-transform: uppercase;
    background: var(--k12-tag-bg, rgba(99,102,241,.15));
    color: var(--k12-accent2, #a5b4fc);
    border: 1px solid rgba(255,255,255,.15);
    margin-bottom: .5rem;
}

/* ── Stats row ───────────────────────────────────────────────────────── */
.k12-stats-row {
    display: flex;
    gap: .75rem;
    flex-wrap: wrap;
}
.k12-stat-card {
    flex: 1 1 80px;
    background: rgba(255,255,255,.08);
    border: 1px solid rgba(255,255,255,.12);
    border-radius: 1rem;
    padding: .75rem;
    text-align: center;
}
.k12-stat-num {
    font-size: 1.4rem;
    font-weight: 900;
    color: var(--k12-accent, #6366f1);
}
.k12-stat-lbl {
    font-size: .72rem;
    color: rgba(255,255,255,.65);
    margin-top: .15rem;
}

/* ── Progress bar ────────────────────────────────────────────────────── */
.k12-progress-wrap {
    display: flex;
    align-items: center;
    gap: .75rem;
}
.k12-progress-bar {
    flex: 1;
    height: 8px;
    background: rgba(255,255,255,.15);
    border-radius: 4px;
    overflow: hidden;
}
.k12-progress-fill {
    height: 100%;
    background: var(--k12-accent, #6366f1);
    border-radius: 4px;
    transition: width .6s ease;
}
.k12-progress-label {
    font-size: .78rem;
    font-weight: 700;
    color: var(--k12-accent, #6366f1);
    white-space: nowrap;
}

/* ── Class switcher pills ────────────────────────────────────────────── */
.k12-cls-switch {
    min-width: 34px;
    height: 34px;
    border-radius: .6rem;
    border: 1.5px solid #e2e8f0;
    background: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: .82rem;
    font-weight: 700;
    color: #475569;
    text-decoration: none;
    transition: background .2s, border-color .2s, color .2s, transform .15s;
}
.k12-cls-switch:hover {
    text-decoration: none;
    transform: scale(1.1);
}
.k12-cls-switch.active, .k12-cls-switch.seg-primary.active  { background: #fef3c7; border-color: #f59e0b; color: #b45309; }
.k12-cls-switch.seg-middle.active  { background: #eef2ff; border-color: #6366f1; color: #4338ca; }
.k12-cls-switch.seg-secondary.active { background: #f0fdf4; border-color: #22c55e; color: #15803d; }
.k12-cls-switch.seg-senior.active  { background: #f5f3ff; border-color: #7c3aed; color: #6d28d9; }

/* ── Subjects section ────────────────────────────────────────────────── */
.k12-subjects-section {
    padding: 2.5rem 0 3.5rem;
    background: var(--k12-bg, #f8fafc);
}

/* ── Subject grid ────────────────────────────────────────────────────── */
.k12-subject-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.25rem;
}
.k12-subject-card {
    background: var(--k12-card-bg, #fff);
    border: 1.5px solid var(--k12-card-border, #e2e8f0);
    border-radius: var(--k12-radius, 1.25rem);
    padding: 1.5rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: .6rem;
    text-decoration: none;
    color: inherit;
    box-shadow: 0 2px 12px rgba(0,0,0,.05);
    transition: transform .2s, box-shadow .2s, border-color .2s;
}
.k12-subject-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 32px rgba(0,0,0,.1);
    text-decoration: none;
    color: inherit;
    border-color: var(--k12-accent, #6366f1);
}
.k12-subj-icon {
    width: 48px; height: 48px;
    border-radius: .9rem;
    display: flex; align-items: center; justify-content: center;
    color: #fff;
    font-size: 1.2rem;
}
.k12-subj-name {
    font-weight: 700;
    font-size: var(--k12-font-size, 1rem);
    color: #1e293b;
}
.k12-subj-topics {
    font-size: .78rem;
    color: #94a3b8;
}
.k12-subj-prog-wrap {
    display: flex;
    align-items: center;
    gap: .5rem;
    margin-top: .25rem;
}
.k12-subj-prog-bar {
    flex: 1;
    height: 5px;
    background: #f1f5f9;
    border-radius: 3px;
    overflow: hidden;
}
.k12-subj-prog-fill {
    height: 100%;
    border-radius: 3px;
    transition: width .5s ease;
}
/* Use same ck-* gradient classes from Index page */
.ck-indigo  { background: linear-gradient(135deg,#6366f1,#4338ca); }
.ck-blue    { background: linear-gradient(135deg,#3b82f6,#1d4ed8); }
.ck-purple  { background: linear-gradient(135deg,#a855f7,#7c3aed); }
.ck-teal    { background: linear-gradient(135deg,#14b8a6,#0d9488); }
.ck-orange  { background: linear-gradient(135deg,#f97316,#ea580c); }
.ck-red     { background: linear-gradient(135deg,#ef4444,#dc2626); }
.ck-amber   { background: linear-gradient(135deg,#f59e0b,#d97706); }
.ck-green   { background: linear-gradient(135deg,#22c55e,#16a34a); }
.ck-cyan    { background: linear-gradient(135deg,#06b6d4,#0891b2); }
.ck-pink    { background: linear-gradient(135deg,#ec4899,#db2777); }
.ck-sky     { background: linear-gradient(135deg,#38bdf8,#0284c7); }
.ck-lime    { background: linear-gradient(135deg,#84cc16,#65a30d); }
.ck-violet  { background: linear-gradient(135deg,#8b5cf6,#7c3aed); }
.ck-emerald { background: linear-gradient(135deg,#10b981,#059669); }
.ck-rose    { background: linear-gradient(135deg,#f43f5e,#e11d48); }
.ck-fuchsia { background: linear-gradient(135deg,#d946ef,#c026d3); }

/* fill variant (for progress bars) */
.ck-indigo.k12-subj-prog-fill  { background: #6366f1; }
.ck-blue.k12-subj-prog-fill    { background: #3b82f6; }
.ck-orange.k12-subj-prog-fill  { background: #f97316; }
.ck-green.k12-subj-prog-fill   { background: #22c55e; }
.ck-amber.k12-subj-prog-fill   { background: #f59e0b; }
.ck-red.k12-subj-prog-fill     { background: #ef4444; }
.ck-teal.k12-subj-prog-fill    { background: #14b8a6; }
.ck-purple.k12-subj-prog-fill  { background: #a855f7; }
.ck-cyan.k12-subj-prog-fill    { background: #06b6d4; }
.ck-pink.k12-subj-prog-fill    { background: #ec4899; }

.k12-subj-pct { font-size: .72rem; font-weight: 700; color: var(--k12-accent,#6366f1); }
.k12-subj-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
}

/* ── Topic row list ───────────────────────────────────────────────────── */
.k12-topic-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--k12-card-bg, #fff);
    border: 1.5px solid var(--k12-card-border, #e2e8f0);
    border-radius: var(--k12-radius, 1.1rem);
    padding: 1rem 1.25rem;
    text-decoration: none;
    color: inherit;
    transition: transform .2s, box-shadow .2s, border-color .2s;
}
.k12-topic-row:hover {
    transform: translateX(4px);
    box-shadow: 0 4px 20px rgba(0,0,0,.08);
    border-color: var(--k12-accent, #6366f1);
    text-decoration: none;
    color: inherit;
}
.k12-topic-row.completed {
    background: rgba(34,197,94,.04);
    border-color: #bbf7d0;
}
.k12-topic-num {
    width: 36px; height: 36px; min-width: 36px;
    border-radius: 50%;
    background: var(--k12-tag-bg, rgba(99,102,241,.1));
    display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: .88rem;
    color: var(--k12-accent, #6366f1);
}
.k12-topic-info { flex: 1; min-width: 0; }
.k12-topic-title { font-weight: 700; font-size: .95rem; color: #1e293b; }
.k12-topic-sub   { font-size: .8rem; color: #64748b; margin-top: .15rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.k12-topic-right { display: flex; align-items: center; gap: .75rem; }
.k12-topic-done  { font-size: .8rem; font-weight: 700; color: #22c55e; white-space: nowrap; }
.k12-topic-xp    { font-size: .8rem; font-weight: 700; color: var(--k12-accent,#6366f1); white-space: nowrap; }
.k12-topic-arrow { color: #cbd5e1; font-size: .9rem; }

/* ── Daily challenge strip ────────────────────────────────────────────── */
.k12-daily-section {
    padding: 2rem 0 2.5rem;
    background: #fff;
}
.k12-daily-card {
    background: linear-gradient(135deg, var(--k12-hero-from,#0f172a), var(--k12-hero-to,#1e1b4b));
    border-radius: var(--k12-radius, 1.25rem);
    padding: 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    position: relative;
    overflow: hidden;
}
.k12-daily-card::before {
    content:'';
    position:absolute;inset:0;
    background: radial-gradient(ellipse 40% 60% at 80% 50%, var(--k12-hero-glow,rgba(99,102,241,.2)) 0%,transparent 70%);
    pointer-events:none;
}
.k12-daily-badge {
    display: inline-block;
    background: var(--k12-accent,#6366f1);
    color: #fff;
    font-size: .72rem;
    font-weight: 800;
    letter-spacing: .08em;
    border-radius: 2rem;
    padding: .25rem .75rem;
    margin-bottom: .6rem;
}
.k12-daily-title {
    font-size: 1.25rem;
    font-weight: 800;
    color: #fff;
    margin: 0 0 .4rem;
}
.k12-daily-sub {
    font-size: .85rem;
    color: rgba(255,255,255,.65);
    margin-bottom: 1.25rem;
}
.k12-daily-btn {
    background: var(--k12-btn-bg, linear-gradient(135deg,#6366f1,#4338ca));
    color: #fff;
    border: none;
    border-radius: .85rem;
    padding: .65rem 1.75rem;
    font-weight: 700;
    font-size: .9rem;
    cursor: pointer;
    transition: transform .2s, box-shadow .2s;
}
.k12-daily-btn:hover { transform: scale(1.03); box-shadow: 0 6px 20px rgba(0,0,0,.3); }
.k12-daily-right { flex-shrink: 0; }
.k12-daily-orb {
    width: 90px; height: 90px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--k12-accent,#6366f1), var(--k12-accent2,#818cf8));
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    box-shadow: 0 0 40px rgba(99,102,241,.5);
}

/* ── Challenge MCQ ────────────────────────────────────────────────────── */
.k12-challenge-area, .k12-mcq-card {
    background: var(--k12-card-bg,#fff);
    border: 1.5px solid var(--k12-card-border,#e2e8f0);
    border-radius: var(--k12-radius, 1.1rem);
    padding: 1.5rem;
}
.k12-mcq-q {
    font-weight: 700;
    font-size: var(--k12-font-size, 1rem);
    color: #1e293b;
    margin-bottom: 1rem;
}
.k12-mcq-opts {
    display: flex;
    flex-direction: column;
    gap: .6rem;
}
.k12-mcq-opt {
    display: flex;
    align-items: center;
    gap: .75rem;
    background: #f8fafc;
    border: 1.5px solid #e2e8f0;
    border-radius: .85rem;
    padding: .7rem 1rem;
    text-align: left;
    cursor: pointer;
    font-size: .88rem;
    font-weight: 500;
    color: #334155;
    transition: background .15s, border-color .15s;
}
.k12-mcq-opt:hover:not([disabled]) { background: var(--k12-tag-bg,rgba(99,102,241,.08)); border-color: var(--k12-accent,#6366f1); }
.k12-mcq-letter {
    width: 28px; height: 28px; min-width: 28px;
    border-radius: 50%;
    background: var(--k12-accent,#6366f1);
    color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: .78rem; font-weight: 800;
}
.k12-opt-correct { background: rgba(34,197,94,.1) !important; border-color: #22c55e !important; color: #15803d !important; }
.k12-opt-correct .k12-mcq-letter { background: #22c55e !important; }
.k12-opt-wrong   { background: rgba(239,68,68,.08) !important; border-color: #ef4444 !important; color: #b91c1c !important; }
.k12-opt-wrong .k12-mcq-letter   { background: #ef4444 !important; }
.k12-mcq-exp {
    margin-top: .75rem;
    background: rgba(99,102,241,.07);
    border-left: 3px solid var(--k12-accent,#6366f1);
    border-radius: 0 .5rem .5rem 0;
    padding: .6rem .9rem;
    font-size: .82rem;
    color: #475569;
}

/* ── MCQ inline (Learn page) ──────────────────────────────────────────── */
.k12-mcq-item { margin-bottom: 1.25rem; }

/* ── Tip cards ────────────────────────────────────────────────────────── */
.k12-tip-card {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    background: #fff;
    border-radius: 1rem;
    padding: 1.25rem;
    box-shadow: 0 2px 10px rgba(0,0,0,.05);
}
.k12-tip-icon { font-size: 1.5rem; flex-shrink: 0; }
.k12-tip-title { font-weight: 700; font-size: .9rem; color: #1e293b; margin-bottom: .25rem; }
.k12-tip-text  { font-size: .82rem; color: #64748b; }

/* ── Learn page content cards ─────────────────────────────────────────── */
.k12-content-card {
    background: var(--k12-card-bg,#fff);
    border: 1.5px solid var(--k12-card-border,#e2e8f0);
    border-radius: var(--k12-radius,1.25rem);
    padding: 2rem 2rem 1.75rem;
    margin-bottom: 1.75rem;
    box-shadow: 0 4px 20px rgba(0,0,0,.05), 0 1px 3px rgba(0,0,0,.04);
    animation: fadeSlideUp .5s ease both;
    position: relative;
    overflow: hidden;
}
.k12-content-card::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; height: 4px;
    background: linear-gradient(90deg, var(--k12-accent,#6366f1), #a78bfa, #22d3ee);
    border-radius: 1.25rem 1.25rem 0 0;
}
.k12-content-type {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    font-size: .7rem;
    font-weight: 800;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: #fff;
    background: var(--k12-accent,#6366f1);
    padding: .3rem .75rem;
    border-radius: 2rem;
    margin-bottom: .75rem;
}
.k12-content-title {
    font-size: 1.25rem;
    font-weight: 900;
    color: #0f172a;
    margin-bottom: 1.25rem;
    line-height: 1.3;
}

/* ── Lesson body — rich text styling ─────────────────────────── */
.k12-lesson-body {
    font-size: var(--k12-font-size,.95rem);
    color: #334155;
    line-height: 1.8;
}
.k12-lesson-body h4 {
    font-size: 1.15rem;
    font-weight: 800;
    color: #1e293b;
    margin: 1.5rem 0 .75rem;
    padding-bottom: .4rem;
    border-bottom: 2px solid rgba(99,102,241,.15);
}
.k12-lesson-body p { margin-bottom: .75rem; }
.k12-lesson-body strong { color: #1e293b; }
.k12-lesson-body ul, .k12-lesson-body ol { padding-left: 1.25rem; margin-bottom: 1rem; }
.k12-lesson-body li { margin-bottom: .35rem; }
.k12-lesson-body table {
    width: 100%;
    border-collapse: collapse;
    font-size: .88rem;
    margin: 1rem 0;
    border-radius: .75rem;
    overflow: hidden;
    box-shadow: 0 1px 6px rgba(0,0,0,.06);
}
.k12-lesson-body table th {
    background: var(--k12-accent,#6366f1);
    color: #fff;
    padding: .65rem .75rem;
    font-weight: 700;
    text-align: left;
}
.k12-lesson-body table td {
    padding: .55rem .75rem;
    border: 1px solid #e2e8f0;
}
.k12-lesson-body table tr:nth-child(even) td { background: #f8fafc; }
.k12-lesson-body code {
    background: #f1f5f9;
    padding: .15rem .4rem;
    border-radius: .3rem;
    font-size: .88em;
    color: #6366f1;
    font-weight: 600;
}
.k12-lesson-body img { max-width: 100%; border-radius: .75rem; margin: 1rem 0; }

/* ── Mnemonic card ───────────────────────────────────────────── */
.k12-mnemonic-card {
    border-left: 5px solid #f59e0b;
    background: linear-gradient(135deg, #fffbeb, #fff);
}
.k12-mnemonic-card::before { background: linear-gradient(90deg, #f59e0b, #fbbf24, #f59e0b); }
.k12-mnemonic-body { font-size: .95rem; color: #78350f; line-height: 1.8; }
.k12-mnemonic-body strong { color: #92400e; }

/* ── Summary card ────────────────────────────────────────────── */
.k12-summary-card {
    border-left: 5px solid var(--k12-accent,#6366f1);
    background: linear-gradient(135deg, #eef2ff, #fff);
}
.k12-summary-card::before { background: linear-gradient(90deg, #6366f1, #818cf8, #6366f1); }
.k12-summary-body { font-size: .92rem; color: #334155; line-height: 1.8; }

/* ── MCQ card in Learn page ─────────────────────────────────── */
.k12-content-card:has(.k12-mcq-inline)::before {
    background: linear-gradient(90deg, #22c55e, #4ade80, #22c55e);
}

/* ── Mark complete button ─────────────────────────────────────── */
.k12-complete-btn {
    background: linear-gradient(135deg, #6366f1, #4338ca);
    color: #fff;
    border: none;
    border-radius: 1.25rem;
    padding: 1rem 2.5rem;
    font-size: 1.05rem;
    font-weight: 800;
    cursor: pointer;
    transition: transform .2s, box-shadow .3s;
    box-shadow: 0 4px 16px rgba(99,102,241,.35);
    letter-spacing: .01em;
}
.k12-complete-btn:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 28px rgba(99,102,241,.45);
}

/* ── Sidebar card ─────────────────────────────────────────────── */
.k12-sidebar-card {
    background: #fff;
    border: 1.5px solid #e2e8f0;
    border-radius: 1.25rem;
    padding: 1.5rem;
    box-shadow: 0 4px 16px rgba(0,0,0,.04);
}

/* ── MCQ items in Learn page ─────────────────────────────────── */
.k12-mcq-item {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #f1f5f9;
}
.k12-mcq-item:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.k12-mcq-q {
    font-size: 1rem;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: .75rem;
    line-height: 1.5;
}
.k12-mcq-opts { display: flex; flex-direction: column; gap: .5rem; }
.k12-mcq-opt {
    display: flex;
    align-items: center;
    gap: .75rem;
    padding: .65rem 1rem;
    border: 2px solid #e2e8f0;
    border-radius: .75rem;
    background: #fff;
    cursor: pointer;
    font-size: .9rem;
    font-weight: 500;
    color: #334155;
    transition: all .2s;
    text-align: left;
    width: 100%;
}
.k12-mcq-opt:hover:not([disabled]) {
    border-color: var(--k12-accent,#6366f1);
    background: rgba(99,102,241,.04);
    transform: translateX(4px);
}
.k12-mcq-letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px; height: 30px;
    border-radius: 50%;
    background: #f1f5f9;
    font-weight: 800;
    font-size: .8rem;
    color: #64748b;
    flex-shrink: 0;
    transition: all .2s;
}
.k12-opt-correct {
    background: rgba(34,197,94,.08) !important;
    border-color: #22c55e !important;
    color: #15803d !important;
}
.k12-opt-correct .k12-mcq-letter {
    background: #22c55e !important;
    color: #fff !important;
}
.k12-opt-wrong {
    background: rgba(239,68,68,.06) !important;
    border-color: #ef4444 !important;
    color: #b91c1c !important;
}
.k12-opt-wrong .k12-mcq-letter {
    background: #ef4444 !important;
    color: #fff !important;
}

/* ── Primary segment enrichments ─────────────────────────────── */
[data-segment="primary"] .k12-content-card { border-radius: 1.5rem; padding: 2rem; }
[data-segment="primary"] .k12-content-title { font-size: 1.35rem; }
[data-segment="primary"] .k12-lesson-body { font-size: 1.05rem; line-height: 2; }
[data-segment="primary"] .k12-mcq-q { font-size: 1.1rem; }
[data-segment="primary"] .k12-mcq-opt { padding: .75rem 1rem; font-size: .95rem; border-radius: 1rem; }

/* ── Interactive Activities ──────────────────────────────────── */
.k12-activity-card { position: relative; }
.k12-activity-card::before {
    background: linear-gradient(90deg, #ec4899, #f43f5e, #ec4899) !important;
}
.k12-act-tabs {
    display: flex;
    gap: .4rem;
    flex-wrap: wrap;
}
.k12-act-tab {
    padding: .45rem .85rem;
    border: 2px solid #e2e8f0;
    border-radius: 2rem;
    background: #fff;
    font-size: .8rem;
    font-weight: 700;
    color: #64748b;
    cursor: pointer;
    transition: all .2s;
}
.k12-act-tab:hover { border-color: #ec4899; color: #ec4899; }
.k12-act-tab.active {
    background: linear-gradient(135deg, #ec4899, #f43f5e);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 3px 12px rgba(236,72,153,.3);
}

/* Fill-in-blanks option buttons */
.k12-fill-opt {
    padding: .55rem 1.1rem;
    border: 2px solid #e2e8f0;
    border-radius: .75rem;
    background: #fff;
    font-size: .88rem;
    font-weight: 600;
    color: #334155;
    cursor: pointer;
    transition: all .2s;
}
.k12-fill-opt:hover:not([disabled]) {
    border-color: #6366f1;
    background: rgba(99,102,241,.04);
    transform: translateY(-2px);
    box-shadow: 0 3px 10px rgba(99,102,241,.15);
}

/* Match game items */
.k12-match-item {
    padding: .6rem .75rem;
    border: 2px solid #e2e8f0;
    border-radius: .75rem;
    background: #fff;
    cursor: pointer;
    transition: all .2s;
    margin-bottom: .5rem;
    line-height: 1.4;
}
.k12-match-item:hover:not(.k12-match-done) {
    border-color: #6366f1;
    box-shadow: 0 2px 8px rgba(99,102,241,.15);
}
.k12-match-done {
    cursor: default;
    opacity: .85;
}

/* Primary segment: bigger activity buttons */
[data-segment="primary"] .k12-act-tab { padding: .55rem 1rem; font-size: .85rem; }
[data-segment="primary"] .k12-fill-opt { padding: .65rem 1.25rem; font-size: .95rem; border-radius: 1rem; }
[data-segment="primary"] .k12-match-item { padding: .75rem 1rem; font-size: .9rem; border-radius: 1rem; }

/* ── Responsive ──────────────────────────────────────────────── */
@media(max-width:768px) {
    .k12-content-card { padding: 1.25rem 1rem; border-radius: 1rem; }
    .k12-content-title { font-size: 1.05rem; }
    .k12-complete-btn { padding: .85rem 1.5rem; font-size: .95rem; width: 100%; }
}

/* ── XP toast ─────────────────────────────────────────────────────────── */
.k12-xp-toast {
    position: fixed;
    bottom: 2rem; right: 2rem;
    background: linear-gradient(135deg,#6366f1,#4338ca);
    color: #fff;
    font-weight: 800;
    font-size: 1.2rem;
    padding: .75rem 1.5rem;
    border-radius: 1rem;
    box-shadow: 0 8px 24px rgba(99,102,241,.5);
    opacity: 0;
    transform: translateY(0);
    transition: opacity .3s, transform .4s;
    z-index: 9999;
}

/* ── Primary segment special: larger fonts, cartoon feel ─────────────── */
[data-segment="primary"] .k12-hub-title { font-size: clamp(1.8rem, 5vw, 2.8rem); }
[data-segment="primary"] .k12-subject-card { border-width: 2.5px; }
[data-segment="primary"] .k12-subj-name { font-size: 1.1rem; }
[data-segment="primary"] .k12-mcq-q   { font-size: 1.05rem; }
[data-segment="primary"] .k12-topic-title { font-size: 1rem; }

/* ── Senior segment: professional, compact ────────────────────────────── */
[data-segment="senior"] .k12-hub-title  { font-size: clamp(1.4rem, 3.5vw, 2rem); }
[data-segment="senior"] .k12-daily-card { border-radius: .85rem; }

/* ── Responsive ───────────────────────────────────────────────────────── */
@media (max-width: 576px) {
    .k12-hub-hero { padding: 2.5rem 0 2rem; }
    .k12-subject-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
    .k12-stats-row { gap: .5rem; }
    .k12-daily-card { padding: 1.25rem; }
    .k12-complete-btn { padding: .75rem 1.5rem; font-size: .9rem; }
}