:root {
    --bg-page: #0f172a;
    --bg-card: #1e293b;
    --bg-card-alt: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #cbd5e1;
    --brand-primary: #40B3A2;
    --brand-error: #ef4444;
    --brand-warning: #f59e0b;
    --border-color: rgba(255, 255, 255, 0.1);
    --font-sans: 'Poppins', sans-serif;
}

body {
    background-color: var(--bg-page);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    margin: 0;
    -webkit-font-smoothing: antialiased;
}

.skill-page-wrapper {
    max-width: 1100px;
    margin: 0 auto;
    padding: 80px 24px 120px;
}

/* Header Section */
.skill-hero {
    margin-bottom: 48px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border-color);
}

.skill-hero-header {
    display: flex;
    align-items: flex-start;
    gap: 24px;
}

.skill-logo-wrapper {
    width: 80px;
    height: 80px;
    flex-shrink: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.skill-logo-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 8px;
}

.skill-hero-title h1 {
    font-size: 2.75rem;
    font-weight: 800;
    margin: 0 0 16px;
    letter-spacing: -0.025em;
    color: var(--text-primary);
    line-height: 1.1;
}

.skill-hero-desc {
    font-size: 1.3rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* Overview Cards Section */
.overview-cards-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 64px;
}

.overview-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.overview-card-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin: 0 0 20px;
    color: var(--text-primary);
    line-height: 1.3;
}

.overview-card-content {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
}

.overview-card-content p {
    margin: 0 0 16px;
}

.overview-card-content p:last-child {
    margin-bottom: 0;
}

/* Note Card (Full Width) */
.note-card {
    grid-column: 1 / -1;
    background: rgba(64, 179, 162, 0.08);
    border: 1px solid rgba(64, 179, 162, 0.2);
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 24px 32px;
}

.note-icon {
    color: var(--brand-primary);
    font-size: 1.3rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.note-content {
    font-size: 0.95rem;
    color: var(--text-tertiary);
    font-style: italic;
    line-height: 1.6;
}

/* Context Section */
.context-section {
    margin-bottom: 80px;
}

.section-heading {
    font-size: 2rem;
    font-weight: 800;
    margin: 0 0 32px;
    color: var(--text-primary);
    text-align: center;
}

.context-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-items: start;
}

.context-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.context-card-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin: 0 0 20px;
    color: var(--text-primary);
}

.context-card-content,
.context-card-desc {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 24px;
}

.context-card-content p {
    margin: 0 0 16px;
}

.context-card-content p:last-child {
    margin-bottom: 0;
}

.context-lists {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-top: auto;
}

.context-list-group strong {
    display: block;
    color: var(--text-primary);
    font-size: 0.95rem;
    margin-bottom: 12px;
}

.context-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.context-list li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

.context-list li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--brand-primary);
    font-weight: bold;
}

/* Feature Cards Grid */
.feature-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 80px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-primary);
}

.card-desc {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: 0.95rem;
}

.feature-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.feature-list li {
    position: relative;
    padding-left: 28px;
    margin-bottom: 5px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.can-do-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--brand-primary);
    font-weight: bold;
}

.cannot-do-list li::before {
    content: "✕";
    position: absolute;
    left: 0;
    color: var(--brand-error);
    font-weight: bold;
}

.standard-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--text-tertiary);
}

.feature-card-note {
    margin-top: auto;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    font-style: italic;
    color: var(--text-tertiary);
}

/* Oversight Section */
.oversight-card {
    border-left: 3px solid var(--brand-warning);
}

/* Learning Gradient CTA Section */
.learning-gradient-section {
    margin-top: 80px;
    margin-bottom: 60px;
}

.learning-gradient-header {
    text-align: center;
    margin-bottom: 48px;
}

.learning-gradient-header h2 {
    font-size: 2.2rem;
    font-weight: 800;
    margin: 0 0 12px;
    color: var(--text-primary);
}

.learning-gradient-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.6;
}

/* CTA Grid */
.cta-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    max-width: 1100px;
    margin: 0 auto;
}

/* Single CTA - Full Width */
.cta-grid:has(.cta-card:only-child) {
    grid-template-columns: 1fr;
    max-width: 600px;
}

.cta-grid:has(.cta-card:only-child) .cta-card {
    text-align: center;
}

.cta-grid:has(.cta-card:only-child) .cta-badge {
    align-self: center;
}

.cta-grid:has(.cta-card:only-child) .cta-button {
    align-self: center;
}

/* CTA Cards */
.cta-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease;
    position: relative;
}

.cta-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

/* CTA Icon */
.cta-icon-wrapper {
    width: 68px;
    height: 68px;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cta-icon {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* Invert GPT icon specifically */
.cta-icon[alt="ChatGPT"] {
    filter: invert(1);
}

.cta-icon-fallback {
    font-size: 2.2rem;
    color: var(--brand-primary);
}

.cta-discuss .cta-icon-fallback {
    color: var(--text-tertiary);
}

/* Visual Hierarchy - Explore (Lightest) */
.cta-explore {
    border-color: rgba(148, 163, 184, 0.3);
    background: rgba(30, 41, 59, 0.5);
}

/* Visual Hierarchy - Experience (Most Prominent) */
.cta-experience {
    border-color: rgba(64, 179, 162, 0.5);
    border-width: 2px;
    background: rgba(64, 179, 162, 0.05);
    box-shadow: 0 4px 16px rgba(64, 179, 162, 0.15);
}

.cta-experience:hover {
    box-shadow: 0 8px 32px rgba(64, 179, 162, 0.25);
}

/* Visual Hierarchy - Discuss (Softest) */
.cta-discuss {
    border-color: rgba(148, 163, 184, 0.2);
    background: rgba(30, 41, 59, 0.3);
}

/* CTA Badge */
.cta-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
    align-self: flex-start;
}

.cta-explore .cta-badge {
    background: rgba(148, 163, 184, 0.2);
    color: var(--text-tertiary);
}

.cta-experience .cta-badge {
    background: rgba(64, 179, 162, 0.2);
    color: var(--brand-primary);
}

.cta-discuss .cta-badge {
    background: rgba(148, 163, 184, 0.15);
    color: var(--text-tertiary);
}

/* CTA Title */
.cta-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin: 0 0 16px;
    color: var(--text-primary);
    line-height: 1.3;
}

.cta-experience .cta-title {
    font-size: 1.35rem;
}

/* CTA Description */
.cta-description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0 0 24px;
    flex-grow: 1;
}

/* CTA Button */
.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    font-size: 1rem;
    transition: all 0.2s ease;
    margin-bottom: 20px;
}

.cta-button i {
    font-size: 0.85rem;
    transition: transform 0.2s ease;
}

.cta-button:hover i {
    transform: translateX(3px);
}

/* Button Styles by Type */
.cta-button-explore {
    background: rgba(148, 163, 184, 0.15);
    color: var(--text-primary);
    border: 1px solid rgba(148, 163, 184, 0.3);
}

.cta-button-explore:hover {
    background: rgba(148, 163, 184, 0.25);
    border-color: rgba(148, 163, 184, 0.5);
}

.cta-button-experience {
    background: var(--brand-primary);
    color: #0f172a;
    border: 1px solid var(--brand-primary);
    font-weight: 700;
}

.cta-button-experience:hover {
    background: #4fd4c1;
    box-shadow: 0 4px 12px rgba(64, 179, 162, 0.3);
}

.cta-button-discuss {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.cta-button-discuss:hover {
    background: rgba(30, 41, 59, 0.5);
    border-color: rgba(148, 163, 184, 0.4);
}

/* CTA Limitation Note */
.cta-limitation {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    font-style: italic;
    line-height: 1.6;
    margin: 0;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.cta-experience .cta-limitation {
    border-top-color: rgba(64, 179, 162, 0.2);
}

@media (max-width: 768px) {

    .skill-page-wrapper {
        padding: 60px 16px 80px;
    }

    .skill-hero-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .skill-hero-title h1 {
        font-size: 2rem;
    }

    .skill-hero-desc {
        font-size: 1.1rem;
    }

    .overview-cards-grid,
    .context-grid,
    .feature-grid,
    .cta-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .overview-card,
    .context-card,
    .cta-card {
        padding: 24px;
    }

    .note-card {
        padding: 20px 24px;
    }

    .section-heading {
        font-size: 1.6rem;
    }

    .learning-gradient-header {
        margin-bottom: 32px;
    }

    .learning-gradient-header h2 {
        font-size: 1.8rem;
    }

    .learning-gradient-header p {
        font-size: 1rem;
    }

    .cta-title {
        font-size: 1.2rem;
    }

    .cta-experience .cta-title {
        font-size: 1.25rem;
    }

    .cta-button {
        padding: 12px 24px;
        font-size: 0.95rem;
    }
}