/* ============================================
   LESSON PAGE STYLES (Tenses/Grammar/Vocab)
   ============================================ */

:root {
    --lesson-bg: #FDF7E3;
    --lesson-card: #FFFFFF;
}

body {
    background: var(--lesson-bg);
}

header {
    max-width: 1100px;
    margin: 2rem auto 1rem;
    padding: 2.5rem;
    background: var(--lesson-card);
    border: 6px solid var(--color-black);
    border-radius: 24px;
    box-shadow: 12px 12px 0 rgba(0,0,0,1);
    text-align: center;
}

header h1 {
    font-size: var(--text-4xl);
    color: var(--color-primary);
}

.subtitle {
    margin-top: 0.75rem;
    font-size: var(--text-lg);
    color: var(--text-secondary);
}

.header-buttons,
.header-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

.header-buttons a,
.header-links a {
    padding: 0.75rem 1.5rem;
    border: 4px solid var(--color-black);
    border-radius: 14px;
    text-decoration: none;
    font-weight: var(--font-black);
    background: var(--color-info);
    color: var(--text-inverse);
    box-shadow: 6px 6px 0 rgba(0,0,0,1);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.header-buttons a:hover,
.header-links a:hover {
    transform: translate(-3px, -3px);
    box-shadow: 8px 8px 0 rgba(0,0,0,1);
}

.back-link {
    background: var(--color-warning);
    color: var(--text-primary);
}

.quiz-link,
.quiz-link-small {
    background: var(--color-error);
}

.timeline-link {
    background: var(--color-info);
}

main#content {
    max-width: 1100px;
    margin: 0 auto 3rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding: 0 var(--space-4);
}

.tense-card,
.intro-box,
.lesson-block {
    background: var(--lesson-card);
    border: 5px solid var(--color-black);
    border-radius: 20px;
    box-shadow: 10px 10px 0 rgba(0,0,0,1);
    padding: 2.5rem;
}

.tense-card h2 {
    text-transform: uppercase;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.usage {
    background: #DBEAFE;
    border: 3px solid var(--color-black);
    border-radius: 12px;
    padding: 1rem 1.25rem;
    font-weight: var(--font-semibold);
    box-shadow: inset 0 0 0 2px var(--color-black);
}

.lesson-sections {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.formula,
.examples,
.time-signals,
.tips,
.why-indonesian,
.common-mistakes,
.lesson-panel {
    background: #FFF;
    border: 4px solid var(--color-black);
    border-radius: 18px;
    padding: 1.5rem;
    box-shadow: 6px 6px 0 rgba(0,0,0,1);
}

.formula h4,
.examples h4,
.time-signals h4,
.tips h4,
.why-indonesian h4,
.common-mistakes h4 {
    text-transform: uppercase;
    font-size: var(--text-lg);
    margin-bottom: 0.75rem;
}

.examples ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
    padding-left: 0;
}

.examples li {
    background: #F3F4F6;
    border: 3px solid var(--color-black);
    border-radius: 12px;
    padding: 0.75rem 1rem;
}

.positive,
.negative,
.question {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 3px solid var(--color-black);
    border-radius: 999px;
    font-weight: var(--font-bold);
    font-size: var(--text-sm);
    padding: 0.15rem 0.6rem;
    margin-right: 0.4rem;
    min-width: 36px;
}

.positive {
    background: #BBF7D0;
}

.negative {
    background: #FECACA;
}

.question {
    background: #FDE68A;
}

.time-signals p {
    font-family: var(--font-mono);
    background: #FEF3C7;
    border: 3px solid var(--color-black);
    border-radius: 10px;
    padding: 0.85rem;
}

.why-indonesian {
    background: #E0E7FF;
}

.tips {
    background: #FCE7F3;
}

.common-mistakes .mistake-item {
    background: #FFF;
    border: 3px dashed var(--color-black);
    border-radius: 14px;
    padding: 1rem 1.25rem;
    margin-bottom: 1rem;
}

.wrong {
    color: var(--color-error);
    font-weight: var(--font-black);
}

.correct {
    color: var(--color-success);
    font-weight: var(--font-black);
}

footer {
    max-width: 1100px;
    margin: 0 auto 3rem;
    padding: 2rem;
    background: #FFF0D2;
    border: 5px solid var(--color-black);
    border-radius: 18px;
    box-shadow: 8px 8px 0 rgba(0,0,0,1);
    text-align: center;
    font-weight: var(--font-semibold);
}

@media (max-width: 640px) {
    header {
        margin: 1rem;
        padding: 1.25rem;
        border-width: 4px;
        box-shadow: 6px 6px 0 rgba(0,0,0,1);
    }

    header h1 {
        font-size: var(--text-3xl);
        line-height: 1.2;
    }

    main#content {
        margin: 0 0 3rem;
        padding: 0 1rem;
    }

    .tense-card,
    .intro-box,
    .lesson-block {
        padding: 1.75rem;
    }

    .lesson-sections {
        grid-template-columns: 1fr;
    }

    .header-buttons,
    .header-links {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 0.75rem;
    }

    .header-buttons a,
    .header-links a {
        justify-content: center;
        padding: 0.55rem 0.75rem;
        box-shadow: 3px 3px 0 rgba(0,0,0,1);
    }

    .modal-nav {
        margin: 1rem -0.5rem 2rem;
        border-width: 4px;
        padding: 0.75rem 0.5rem 1rem;
        scroll-snap-type: x proximity;
    }

    .modal-nav a {
        min-width: 120px;
        font-size: var(--text-sm);
        padding: 0.45rem 0.5rem;
    }

    .modal-section {
        padding: 1.5rem;
        box-shadow: 6px 6px 0 rgba(0,0,0,1);
    }

    .modal-card {
        padding: 1.25rem;
        box-shadow: 4px 4px 0 rgba(0,0,0,1);
    }

    .usage-grid,
    .exception-grid,
    .rule-box,
    .compare-items {
        grid-template-columns: 1fr;
    }

    .usage-icon {
        width: 30px;
        height: 30px;
    }

    .section-nav {
        text-align: center;
        margin-top: 1rem;
    }
}
.article-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin: 2rem 0;
}

.article-nav a {
    flex: 1 1 140px;
    text-align: center;
    text-decoration: none;
    text-transform: uppercase;
    font-weight: var(--font-black);
    border: 4px solid var(--color-black);
    border-radius: 14px;
    padding: 0.75rem 1rem;
    background: #E0E7FF;
    color: var(--color-black);
    box-shadow: 6px 6px 0 rgba(0,0,0,1);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.article-nav a:hover {
    transform: translate(-2px, -2px);
    box-shadow: 8px 8px 0 rgba(0,0,0,1);
}

.modal-nav {
    display: flex;
    flex-wrap: nowrap;
    gap: 0.85rem;
    overflow-x: auto;
    padding: 0.75rem 1rem 1rem;
    margin: 1.5rem 0 2.5rem;
    border: 4px solid var(--color-black);
    border-radius: 20px;
    background: var(--lesson-card);
    box-shadow: 8px 8px 0 rgba(0,0,0,1);
    scroll-snap-type: x mandatory;
}

.modal-nav::-webkit-scrollbar {
    height: 8px;
}

.modal-nav::-webkit-scrollbar-thumb {
    background: var(--color-black);
}

.modal-nav a {
    scroll-snap-align: start;
    flex: 0 0 auto;
    min-width: 140px;
    text-align: center;
    text-decoration: none;
    font-weight: var(--font-black);
    border: 4px solid var(--color-black);
    border-radius: 14px;
    padding: 0.65rem 0.85rem;
    background: #DCFCE7;
    color: var(--color-black);
    box-shadow: 6px 6px 0 rgba(0,0,0,1);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.modal-nav a:hover {
    transform: translate(-3px, -3px);
    box-shadow: 8px 8px 0 rgba(0,0,0,1);
}

.article-section {
    background: var(--lesson-card);
    border: 5px solid var(--color-black);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: 10px 10px 0 rgba(0,0,0,1);
    margin-bottom: 2rem;
}

.article-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 1rem;
    align-items: center;
    border-bottom: 4px solid var(--color-black);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
}

.article-header h2 {
    text-transform: uppercase;
    font-size: var(--text-3xl);
    color: var(--color-primary);
}

.article-meaning {
    font-weight: var(--font-bold);
    border: 3px solid var(--color-black);
    border-radius: 999px;
    padding: 0.35rem 1rem;
    background: #FEF3C7;
}

.article-card {
    background: #FFF;
    border: 4px dashed var(--color-black);
    border-radius: 18px;
    padding: 1.75rem;
    margin-bottom: 1.5rem;
}

.article-card h3 {
    text-transform: uppercase;
    margin-bottom: 1rem;
    color: var(--color-orange);
}

.modal-section {
    background: var(--lesson-card);
    border: 5px solid var(--color-black);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: 12px 12px 0 rgba(0,0,0,1);
    margin-bottom: 2.5rem;
}

.modal-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 1rem;
    align-items: baseline;
    border-bottom: 4px solid var(--color-black);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
}

.modal-header h2 {
    text-transform: uppercase;
    font-size: var(--text-3xl);
    color: var(--color-primary);
}

.modal-meaning {
    font-weight: var(--font-black);
    border: 3px solid var(--color-black);
    border-radius: 999px;
    padding: 0.35rem 1.1rem;
    background: #FFF4D7;
}

.modal-card {
    background: #FFF;
    border: 4px solid var(--color-black);
    border-radius: 18px;
    padding: 1.75rem;
    box-shadow: 8px 8px 0 rgba(0,0,0,1);
    margin-bottom: 1.5rem;
}

.formula-box {
    border: 3px dashed var(--color-black);
    border-radius: 16px;
    padding: 1.1rem;
    background: #F3F4F6;
}

.examples {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.section-nav {
    margin-top: 1.25rem;
    text-align: right;
}

.back-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
    border: 3px solid var(--color-black);
    border-radius: 999px;
    padding: 0.4rem 0.95rem;
    font-weight: var(--font-black);
    text-decoration: none;
    color: var(--color-black);
    background: #E0E7FF;
    box-shadow: 4px 4px 0 rgba(0,0,0,1);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.back-chip:hover {
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0 rgba(0,0,0,1);
}

.comparison-note {
    border: 4px solid var(--color-black);
    border-radius: 20px;
    padding: 1.5rem;
    background: #FFF7ED;
    box-shadow: 8px 8px 0 rgba(0,0,0,1);
    margin-bottom: 1.5rem;
}

.comparison-note h4 {
    text-transform: uppercase;
    font-size: var(--text-lg);
    color: var(--color-primary);
    margin-bottom: 0.85rem;
}

.compare-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.compare-item {
    border: 3px dashed var(--color-black);
    border-radius: 16px;
    background: #FFFFFF;
    padding: 1rem;
}

.rule-box {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
}

.rule-item {
    border: 3px solid var(--color-black);
    border-radius: 14px;
    padding: 1rem;
    background: #F3F4F6;
    box-shadow: 4px 4px 0 rgba(0,0,0,1);
}

.rule-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 3px solid var(--color-black);
    border-radius: 999px;
    padding: 0.2rem 0.8rem;
    font-weight: var(--font-black);
    background: #FFF;
    margin-bottom: 0.5rem;
}

.examples-inline {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.5rem;
}

.examples-inline span {
    border: 2px solid var(--color-black);
    border-radius: 999px;
    padding: 0.15rem 0.6rem;
    font-size: var(--text-sm);
    background: #FFFFFF;
}

.warning-box {
    margin-top: 1rem;
    padding: 1rem;
    border: 3px solid var(--color-black);
    border-radius: 14px;
    background: #FFE4E6;
}

.exception-grid,
.usage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.25rem;
}

.exception-item,
.usage-item {
    border: 3px solid var(--color-black);
    border-radius: 16px;
    padding: 1rem;
    background: #FFF;
    box-shadow: 4px 4px 0 rgba(0,0,0,1);
}

.usage-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 3px solid var(--color-black);
    font-weight: var(--font-black);
    margin-bottom: 0.4rem;
}

.intro-box,
.why-hard {
    border: 4px solid var(--color-black);
    border-radius: 20px;
    padding: 1.75rem;
    background: var(--lesson-card);
    box-shadow: 8px 8px 0 rgba(0,0,0,1);
    margin-bottom: 1.5rem;
}

.article-type {
    border: 3px solid var(--color-black);
    border-radius: 16px;
    padding: 1rem;
    background: #FFF;
    text-align: center;
}

.article-types {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}

.big-text {
    font-size: var(--text-3xl);
    font-weight: var(--font-black);
}

.comparison-examples,
.comparison-section .examples,
.comparison-section .ce-item {
    display: block;
}

.comparison-section .comparison-examples {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.comparison-section .ce-item {
    border: 3px solid var(--color-black);
    border-radius: 16px;
    padding: 1rem;
    background: #FFF;
    box-shadow: 4px 4px 0 rgba(0,0,0,1);
}

.summary-box {
    background: #F3F4F6;
    border: 4px solid var(--color-black);
    border-radius: 20px;
    padding: 1.75rem;
    box-shadow: 8px 8px 0 rgba(0,0,0,1);
}

.summary-box h3 {
    text-transform: uppercase;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.quick-tips {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.tip-item {
    border: 3px solid var(--color-black);
    border-radius: 16px;
    padding: 1rem;
    background: #FEF3C7;
    box-shadow: 4px 4px 0 rgba(0,0,0,1);
}

.tip-q {
    display: block;
    font-weight: var(--font-black);
    margin-bottom: 0.5rem;
}

.tip-a {
    display: inline-block;
    font-family: var(--font-mono);
    border: 2px solid var(--color-black);
    border-radius: 8px;
    padding: 0.3rem 0.6rem;
    background: #FFF;
    font-size: var(--text-sm);
}