/* ==========================================================
   AI LESSON GENERATOR PAGE — Deep Purple Academic Theme
   ========================================================== */

/* ── SCROLL REVEAL ── */
.lesson-reveal {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 0.65s ease, transform 0.65s ease;
}
.lesson-reveal.visible { opacity: 1; transform: translateY(0); }

/* ── HERO ── */
.lesson-hero {
    min-height: 85vh;
    display: flex;
    align-items: center;
    background: #0d0822;
    position: relative;
    overflow: hidden;
}

#lesson-canvas {
    position: absolute;
    inset: 0;
    width: 100%; height: 100%;
    z-index: 0;
    pointer-events: none;
}

.lesson-hero-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(90px);
    pointer-events: none;
    z-index: 0;
}
.lesson-orb-1 {
    width: 480px; height: 480px;
    background: radial-gradient(circle, rgba(168, 85, 247, 0.2) 0%, transparent 70%);
    top: -120px; right: -80px;
    animation: orbFloat 8s ease-in-out infinite;
}
.lesson-orb-2 {
    width: 360px; height: 360px;
    background: radial-gradient(circle, rgba(236,72,153,0.12) 0%, transparent 70%);
    bottom: -80px; left: -80px;
    animation: orbFloat 10s ease-in-out infinite reverse;
}
.lesson-orb-3 {
    width: 280px; height: 280px;
    background: radial-gradient(circle, rgba(99,102,241,0.15) 0%, transparent 70%);
    top: 40%; left: 40%;
    animation: orbFloat 6s ease-in-out infinite 2s;
}
@keyframes orbFloat {
    0%,100% { transform: scale(1) translateY(0); }
    50%      { transform: scale(1.1) translateY(-20px); }
}

.lesson-hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 2;
    padding: 80px 24px;
}

/* Badge */
.lesson-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 1rem;
    background: rgba(168,85,247,0.12);
    border: 1px solid rgba(168,85,247,0.35);
    border-radius: 999px;
    color: #c084fc;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 1.4rem;
    animation: fadeUp 0.8s ease both;
}
.lesson-badge-dot {
    width: 7px; height: 7px;
    border-radius: 50%;
    background: #c084fc;
    animation: dotBlink 1.4s ease-in-out infinite;
}
@keyframes dotBlink { 0%,100%{opacity:1;} 50%{opacity:0.15;} }

.lesson-hero-content h1 {
    font-size: clamp(2.2rem, 4vw, 3.2rem);
    font-weight: 900;
    color: #ffffff;
    line-height: 1.15;
    margin-bottom: 0.6rem;
    animation: fadeUp 0.8s ease 0.15s both;
}
.lesson-hero-content h2 {
    font-size: 1.4rem;
    color: rgba(255,255,255,0.7);
    font-weight: 600;
    margin-bottom: 1.2rem;
    animation: fadeUp 0.8s ease 0.28s both;
}
.lesson-hero-desc {
    font-size: 1rem;
    color: rgba(255,255,255,0.55);
    line-height: 1.8;
    margin-bottom: 1.8rem;
    animation: fadeUp 0.8s ease 0.42s both;
}

/* Stats row */
.lesson-stats-row {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
    animation: fadeUp 0.8s ease 0.55s both;
}
.lesson-stat { text-align: left; }
.lesson-stat-val {
    display: block;
    font-size: 1.6rem;
    font-weight: 900;
    color: #c084fc;
    line-height: 1;
}
.lesson-stat-lbl {
    font-size: 0.75rem;
    color: rgba(255,255,255,0.45);
    font-weight: 600;
}

.lesson-hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    animation: fadeUp 0.8s ease 0.68s both;
}
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(22px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── BUILDER CARD ── */
.lesson-builder-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(168,85,247,0.25);
    border-radius: 22px;
    padding: 1.8rem;
    backdrop-filter: blur(16px);
    box-shadow:
        0 24px 64px rgba(0,0,0,0.6),
        0 0 50px rgba(168,85,247,0.08);
    animation: floatCard 7s ease-in-out infinite;
}
@keyframes floatCard { 0%,100%{transform:translateY(0);} 50%{transform:translateY(-12px);} }

.lbc-topbar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.2rem;
    padding-bottom: 0.9rem;
    border-bottom: 1px solid rgba(255,255,255,0.07);
}
.lbc-icon { font-size: 1.2rem; }
.lbc-title {
    font-weight: 700;
    color: rgba(255,255,255,0.75);
    font-size: 0.88rem;
}
.lbc-status {
    margin-left: auto;
    font-size: 0.72rem;
    color: #a78bfa;
    font-weight: 700;
    animation: statusBlink 1.5s ease-in-out infinite;
}
@keyframes statusBlink { 50% { opacity: 0.4; } }

.lbc-topic-row {
    display: flex;
    flex-direction: column;
    background: rgba(168,85,247,0.08);
    border: 1px solid rgba(168,85,247,0.2);
    border-radius: 10px;
    padding: 0.75rem 1rem;
    margin-bottom: 1.2rem;
    min-height: 64px;
}
.lbc-topic-label {
    font-size: 0.68rem;
    color: #c084fc;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.3rem;
}
.lbc-topic-val {
    font-size: 0.97rem;
    color: #ffffff;
    font-weight: 600;
    border-right: 2px solid #c084fc;
    animation: blink-cursor 0.8s steps(1) infinite;
    min-height: 1.2rem;
}
@keyframes blink-cursor { 50% { border-color: transparent; } }

.lbc-output {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    margin-bottom: 1.2rem;
}
.lbc-out-item {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.55rem 0.85rem;
    border-radius: 9px;
    font-size: 0.83rem;
    color: rgba(255,255,255,0.8);
    border-left: 2px solid;
}
.lbc-out-objective { background: rgba(168,85,247,0.1);   border-color: #a78bfa; }
.lbc-out-activity  { background: rgba(236,72,153,0.08);  border-color: #f472b6; }
.lbc-out-quiz      { background: rgba(59,130,246,0.08);  border-color: #60a5fa; }
.lbc-out-summary   { background: rgba(16,185,129,0.08);  border-color: #34d399; }

.lbc-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 0.9rem;
    border-top: 1px solid rgba(255,255,255,0.07);
}
.lbc-ready { font-size: 0.78rem; color: #34d399; font-weight: 700; }
.lbc-export {
    font-size: 0.78rem;
    color: #c084fc;
    font-weight: 700;
    cursor: pointer;
    transition: color 0.2s;
}
.lbc-export:hover { color: #ffffff; }

@media (max-width: 900px) {
    .lesson-hero-grid { grid-template-columns: 1fr; gap: 40px; padding: 90px 24px 60px; }
    .lesson-stats-row { gap: 1.5rem; }
}

/* ── WHAT YOU GET ── */
.lesson-what-you-get { background: #f4f0ff; padding: 4rem 0 3rem; }
.lesson-what-you-get .section-title { color: #1a0938; }
.lesson-section-sub {
    text-align: center;
    color: #6b46a0;
    font-size: 1rem;
    margin-top: -1.5rem;
    margin-bottom: 3rem;
    font-weight: 600;
}

.lesson-output-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.lesson-output-card {
    background: #ffffff;
    border: 1px solid rgba(168,85,247,0.12);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 8px 28px rgba(168,85,247,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.lesson-output-card:hover {
    transform: translateY(-7px);
    box-shadow: 0 20px 48px rgba(168,85,247,0.15);
}

.lesson-output-preview {
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.lesson-output-preview.preview-purple { background: linear-gradient(135deg, #7c3aed, #a855f7); }
.lesson-output-preview.preview-pink   { background: linear-gradient(135deg, #db2777, #ec4899); }
.lesson-output-preview.preview-blue   { background: linear-gradient(135deg, #1d4ed8, #3b82f6); }
.lesson-output-preview.preview-green  { background: linear-gradient(135deg, #059669, #10b981); }
.lesson-output-preview.preview-amber  { background: linear-gradient(135deg, #d97706, #f59e0b); }
.lesson-output-preview.preview-rose   { background: linear-gradient(135deg, #be123c, #f43f5e); }
.lesson-output-preview-icon { font-size: 2.5rem; }

.lesson-output-body { padding: 1.4rem; }
.lesson-output-body strong {
    display: block;
    font-size: 1.02rem;
    font-weight: 800;
    color: #1a0938;
    margin-bottom: 0.45rem;
}
.lesson-output-body > p {
    font-size: 0.88rem;
    color: #6b7280;
    margin-bottom: 0.75rem;
    line-height: 1.6;
}
.lesson-output-body ul { list-style: none; padding: 0; }
.lesson-output-body li {
    font-size: 0.83rem;
    color: #4b5563;
    padding: 0.25rem 0 0.25rem 1.2rem;
    position: relative;
}
.lesson-output-body li::before {
    content: '✦';
    position: absolute;
    left: 0;
    color: #a855f7;
    font-size: 0.6rem;
    top: 0.4em;
}

/* ── HOW TO GENERATE ── */
.lesson-how { background: #0d0822; padding: 4rem 0 3rem; }
.lesson-how .section-title { color: #ffffff; }

.lesson-flow {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
    flex-wrap: wrap;
    position: relative;
}

.lesson-flow-step {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(168,85,247,0.18);
    border-radius: 20px;
    padding: 1.8rem 1.4rem;
    max-width: 180px;
    text-align: center;
    flex: 0 0 auto;
    position: relative;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.lesson-flow-step:hover {
    transform: translateY(-8px);
    border-color: rgba(168,85,247,0.45);
    box-shadow: 0 18px 40px rgba(168,85,247,0.12);
}

.lesson-flow-icon {
    font-size: 2rem;
    margin-bottom: 0.6rem;
    display: block;
}
.lesson-flow-num {
    width: 32px; height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, #7c3aed, #a855f7);
    color: #ffffff;
    font-size: 0.9rem;
    font-weight: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 0.75rem;
    box-shadow: 0 4px 12px rgba(168,85,247,0.4);
}
.lesson-flow-step h3 {
    font-size: 0.92rem;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 0.35rem;
}
.lesson-flow-step p {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.48);
    margin: 0;
    line-height: 1.5;
}

.lesson-flow-connector {
    display: flex;
    align-items: center;
    color: rgba(168,85,247,0.45);
    font-size: 1.4rem;
    padding: 0 0.25rem;
    margin-top: 80px;
}
.lesson-flow-line { display: none; }

@media (max-width: 900px) {
    .lesson-flow { flex-direction: column; align-items: center; }
    .lesson-flow-connector { transform: rotate(90deg); margin: 0; }
}

/* ── USE CASES ── */
.lesson-use-cases { background: #f4f0ff; padding: 4rem 0 3rem; }
.lesson-use-cases .section-title { color: #1a0938; }

.lesson-usecase-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}
.lesson-usecase-card {
    background: #ffffff;
    border: 1px solid rgba(168,85,247,0.1);
    border-radius: 18px;
    padding: 1.8rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}
.lesson-usecase-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, #7c3aed, #a855f7);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}
.lesson-usecase-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 40px rgba(168,85,247,0.12);
}
.lesson-usecase-card:hover::before { transform: scaleX(1); }

.lesson-uc-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}
.lesson-uc-icon { font-size: 1.6rem; }
.lesson-uc-header h3 {
    font-size: 1rem;
    font-weight: 800;
    color: #1a0938;
}
.lesson-usecase-card > p {
    font-size: 0.87rem;
    color: #6b7280;
    line-height: 1.6;
    margin-bottom: 0.8rem;
}
.lesson-usecase-card ul { list-style: none; padding: 0; }
.lesson-usecase-card li {
    font-size: 0.83rem;
    color: #4b5563;
    padding: 0.2rem 0 0.2rem 1.2rem;
    position: relative;
}
.lesson-usecase-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #7c3aed;
    font-weight: 800;
}

/* ── CUSTOMISATION ── */
.lesson-customise { background: #0d0822; padding: 4rem 0 3rem; }
.lesson-customise .section-title { color: #ffffff; }

.lesson-cust-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: center;
}

.lesson-cust-label {
    display: inline-block;
    padding: 0.3rem 0.85rem;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    background: rgba(168,85,247,0.15);
    color: #c084fc;
    border: 1px solid rgba(168,85,247,0.3);
    margin-bottom: 1rem;
}
.lesson-cust-content h2 {
    font-size: 2rem;
    font-weight: 900;
    color: #ffffff;
    margin-bottom: 0.75rem;
}
.lesson-cust-content > p {
    font-size: 0.95rem;
    color: rgba(255,255,255,0.55);
    line-height: 1.7;
    margin-bottom: 2rem;
}

.lesson-cust-options {
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
}
.lesson-cust-option {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    padding: 0.85rem 1.1rem;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(168,85,247,0.14);
    border-radius: 12px;
    transition: background 0.2s ease, border-color 0.2s ease;
}
.lesson-cust-option:hover {
    background: rgba(168,85,247,0.08);
    border-color: rgba(168,85,247,0.3);
}
.lesson-cust-opt-icon { font-size: 1.3rem; flex-shrink: 0; }
.lesson-cust-option strong {
    display: block;
    color: #ffffff;
    font-size: 0.9rem;
}
.lesson-cust-option span {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.45);
}

.lesson-cust-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(168,85,247,0.22);
    border-radius: 20px;
    padding: 1.6rem;
    backdrop-filter: blur(12px);
    box-shadow: 0 20px 50px rgba(0,0,0,0.4);
}
.lesson-cust-card-header {
    font-size: 0.9rem;
    font-weight: 800;
    color: #c084fc;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    margin-bottom: 1rem;
}
.lesson-cust-card-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.65rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}
.lesson-cust-card-row:last-of-type { border-bottom: none; }
.lesson-cust-card-row-label { font-size: 0.83rem; color: rgba(255,255,255,0.55); }
.lesson-cust-card-row-val {
    font-size: 0.83rem;
    color: #ffffff;
    font-weight: 700;
    background: rgba(168,85,247,0.15);
    padding: 0.2rem 0.65rem;
    border-radius: 999px;
    border: 1px solid rgba(168,85,247,0.3);
}
.lesson-cust-generate-btn {
    margin-top: 1.2rem;
    padding: 0.8rem 1.2rem;
    text-align: center;
    background: linear-gradient(135deg, #7c3aed, #a855f7);
    color: #ffffff;
    border-radius: 12px;
    font-weight: 800;
    font-size: 0.9rem;
    cursor: pointer;
    transition: opacity 0.2s ease;
    box-shadow: 0 6px 20px rgba(168,85,247,0.4);
}
.lesson-cust-generate-btn:hover { opacity: 0.9; }

@media (max-width: 900px) {
    .lesson-cust-grid { grid-template-columns: 1fr; gap: 2.5rem; }
}

/* ── SUBJECTS ── */
.lesson-subjects { background: #f4f0ff; padding: 4rem 0 3rem; }
.lesson-subjects .section-title { color: #1a0938; }

.lesson-subject-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}
.lesson-subject-chip {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 1.1rem;
    border-radius: 999px;
    background: #ffffff;
    border: 1px solid rgba(168,85,247,0.2);
    color: #1a0938;
    font-size: 0.88rem;
    font-weight: 700;
    box-shadow: 0 2px 8px rgba(168,85,247,0.08);
    transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
    cursor: default;
}
.lesson-subject-chip:hover {
    background: linear-gradient(135deg, #7c3aed, #a855f7);
    border-color: transparent;
    color: #ffffff;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(168,85,247,0.3);
}

/* ── CTA ── */
.lesson-cta {
    background: linear-gradient(135deg, #1e0938 0%, #4c1d95 50%, #2e1065 100%);
    padding: 5rem 0;
    position: relative;
    overflow: hidden;
}
.lesson-cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 30% 50%, rgba(168,85,247,0.15) 0%, transparent 50%),
                      radial-gradient(circle at 70% 50%, rgba(236,72,153,0.1) 0%, transparent 50%);
}
.lesson-cta-inner {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}
.lesson-cta-inner h2 {
    font-size: 2.2rem;
    font-weight: 900;
    color: #ffffff;
    margin-bottom: 0.75rem;
}
.lesson-cta-inner p {
    color: rgba(255,255,255,0.65);
    font-size: 1rem;
    margin-bottom: 2rem;
}
.lesson-cta-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ── BUTTON OVERRIDES ── */
.lesson-hero .btn-primary,
.lesson-cta .btn-primary {
    background: linear-gradient(135deg, #7c3aed, #a855f7);
    color: #ffffff;
    border: none;
    font-weight: 800;
    box-shadow: 0 6px 20px rgba(168,85,247,0.4);
}
.lesson-hero .btn-secondary {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(168,85,247,0.3);
    color: #c084fc;
}
.lesson-hero .btn-secondary:hover {
    background: rgba(168,85,247,0.12);
    border-color: #c084fc;
    color: #ffffff;
}
.lesson-cta .btn-secondary {
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.2);
    color: #ffffff;
}
.lesson-cta .btn-secondary:hover {
    background: rgba(255,255,255,0.18);
}