:root {
    --arc-primary: #2563eb;
    --arc-primary-dark: #1d4ed8;
    --arc-accent: #0ea5e9;
    --arc-surface: #ffffff;
    --arc-border: #e2e8f0;
    --arc-text: #0f172a;
    --arc-muted: #64748b;
    --arc-success: #22c55e;
    --arc-warning: #f59e0b;
    --arc-radius-lg: 1.5rem;
    --arc-radius-md: 1rem;
    --arc-radius-sm: 0.75rem;
    --arc-shadow-sm: 0 8px 24px rgba(15, 23, 42, 0.08);
    --arc-shadow-lg: 0 30px 60px rgba(37, 99, 235, 0.12);
    
    /* related to and faqs component variables */
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --border: #e2e8f0;
    --surface: #ffffff;
    --shadow-soft: 0 20px 45px rgba(15, 23, 42, 0.08);
    --surface-muted: #f4f6fb;
    --text-main: #0f172a;
    --text-muted: #64748b;
}

.header-section {
    display: flex;
    flex-wrap: wrap;
    gap: 32px;
    align-items: flex-start;
    margin-bottom: 40px;
}

.header-text {
    flex: 1;
    min-width: 260px;
}

.header-text h1 {
    font-size: 40px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
}

.header-subtitle {
    font-size: 18px;
    color: var(--text-muted);
    max-width: 860px;
    margin-bottom: 24px;
}


.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.arc-page {
    padding: clamp(1rem, 2vw, 2rem) 0;
}

.nav-path {
    margin-bottom: clamp(1.25rem, 2vw, 1.75rem);
    padding: 0;
}

.nav-path-list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-path-item {
    display: inline-flex;
    align-items: center;
}

.nav-path-sep {
    display: inline-flex;
    align-items: center;
    color: var(--arc-muted);
    opacity: 0.4;
    margin: 0 0.5rem;
    font-size: 0.875rem;
    user-select: none;
}

.nav-path-link {
    color: var(--arc-muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-path-link:hover {
    color: var(--arc-primary);
}

.nav-path-current {
    color: var(--arc-text);
    font-size: 0.9rem;
    font-weight: 600;
}

.opening-scenario {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05) 0%, rgba(14, 165, 233, 0.05) 100%);
    border-left: 4px solid var(--arc-primary);
    border-radius: var(--arc-radius-md);
    padding: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: clamp(2rem, 4vw, 3rem);
}

.opening-scenario h1 {
    font-size: clamp(2rem, 5vw, 2.75rem);
    font-weight: 800;
    color: var(--arc-text);
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.opening-scenario p {
    font-size: clamp(1rem, 2vw, 1.15rem);
    color: var(--arc-muted);
    line-height: 1.7;
    margin: 0;
}

.conversion-workspace {
    background: var(--arc-surface);
    border-radius: var(--arc-radius-lg);
    padding: clamp(1.75rem, 3vw, 2.75rem);
    box-shadow: var(--arc-shadow-lg);
    border: 1px solid rgba(148, 163, 184, 0.25);
    margin-bottom: clamp(2.5rem, 4vw, 3.5rem);
}

.workspace-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: clamp(1.75rem, 3vw, 2.75rem);
    align-items: start;
}

.units-output-container {
    margin-top: clamp(2rem, 3vw, 2.5rem);
    grid-column: 1 / -1;
}

.workspace-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.conversion-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.input-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 700;
    color: var(--arc-text);
    font-size: 1rem;
}

.help-tooltip {
    position: relative;
    display: inline-flex;
}

.help-trigger {
    border: none;
    background: rgba(37, 99, 235, 0.12);
    color: var(--arc-primary);
    border-radius: 999px;
    width: 1.75rem;
    height: 1.75rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    cursor: help;
}

.help-text {
    visibility: hidden;
    opacity: 0;
    position: absolute;
    bottom: 140%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--arc-text);
    color: #ffffff;
    padding: 0.8rem;
    border-radius: var(--arc-radius-sm);
    width: 240px;
    font-size: 0.85rem;
    line-height: 1.4;
    transition: opacity 0.2s ease;
    z-index: 40;
}

.help-tooltip:hover .help-text,
.help-tooltip:focus-within .help-text {
    visibility: visible;
    opacity: 1;
}

.value-input {
    width: 100%;
    padding: clamp(0.95rem, 2.5vw, 1.15rem);
    border: 2px solid var(--arc-border);
    border-radius: var(--arc-radius-md);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--arc-text);
    background: #f8fafc;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.value-input:focus {
    outline: none;
    border-color: var(--arc-primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
    background: #ffffff;
}

.unit-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
}

.unit-dropdown {
    appearance: none;
    width: 100%;
    padding: 1rem 1.25rem;
    border-radius: var(--arc-radius-md);
    border: 2px solid var(--arc-border);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--arc-text);
    background: #ffffff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 20 20'%3E%3Cpath fill='%2364748b' d='M5.23 7.21a1 1 0 0 1 1.4-.18L10 9.58l3.37-2.55a1 1 0 1 1 1.22 1.58l-4 3a1 1 0 0 1-1.22 0l-4-3a1 1 0 0 1-.14-1.4Z'/%3E%3C/svg%3E") no-repeat right 1.25rem center;
    cursor: pointer;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.unit-dropdown:focus {
    outline: none;
    border-color: var(--arc-primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

.action-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
}

.btn-primary {
    flex: 1 1 200px;
    background: linear-gradient(135deg, var(--arc-primary) 0%, var(--arc-primary-dark) 100%);
    color: #ffffff;
    border: none;
    padding: 1rem 1.5rem;
    border-radius: var(--arc-radius-md);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 30px rgba(37, 99, 235, 0.25);
}

.btn-secondary {
    flex: 1 1 160px;
    background: #ffffff;
    color: var(--arc-primary);
    border: 2px solid rgba(37, 99, 235, 0.35);
    padding: 1rem 1.5rem;
    border-radius: var(--arc-radius-md);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.btn-secondary:hover {
    background: rgba(37, 99, 235, 0.08);
    transform: translateY(-2px);
}

.output-display {
    background: linear-gradient(135deg, var(--arc-primary) 0%, var(--arc-primary-dark) 100%);
    color: #ffffff;
    border-radius: var(--arc-radius-lg);
    padding: clamp(1.5rem, 3vw, 2rem);
    box-shadow: 0 30px 40px rgba(15, 23, 42, 0.25);
    position: relative;
    overflow: hidden;
}

.output-display::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top right, rgba(37, 99, 235, 0.4), transparent 55%);
    pointer-events: none;
}

.output-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.output-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0;
}

.output-value {
    font-size: clamp(2.25rem, 5vw, 3.25rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    display: inline-flex;
    align-items: baseline;
    gap: 0.75rem;
    position: relative;
}

.output-value::after {
    content: attr(data-unit);
    font-size: 1.15rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.75);
    letter-spacing: 0;
}

.output-description {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.82);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.formula-display {
    background: rgba(15, 23, 42, 0.45);
    border-radius: var(--arc-radius-md);
    padding: 1rem;
    margin-top: 1rem;
}

.formula-content {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
    margin: 0;
}

.output-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1.5rem;
}

.copy-row {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.copy-row .btn-copy {
    flex: 1 1 auto;
    min-width: 140px;
}

.btn-copy {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.85rem 1.25rem;
    border-radius: var(--arc-radius-md);
    border: 1px solid rgba(255, 255, 255, 0.4);
    background: rgba(255, 255, 255, 0.08);
    color: #ffffff;
    font-weight: 600;
    transition: background 0.2s ease, transform 0.2s ease;
    cursor: pointer;
}

.btn-copy:hover {
    background: rgba(255, 255, 255, 0.18);
    transform: translateY(-1px);
}

.btn-copy[data-state="copied"] {
    background: rgba(34, 197, 94, 0.18);
    border-color: rgba(34, 197, 94, 0.6);
}

.share-box {
    background: rgba(255, 255, 255, 0.12);
    border-radius: var(--arc-radius-md);
    padding: 1rem 1.25rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.share-label {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: rgba(255, 255, 255, 0.85);
}

.share-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.5rem;
}

.share-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.65rem 0.75rem;
    border-radius: 0.75rem;
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    color: #ffffff;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.share-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 20px rgba(15, 23, 42, 0.2);
}

.share-x { background: #111827; }
.share-facebook { background: #1877f2; }
.share-linkedin { background: #0a66c2; }
.share-reddit { background: #ff4500; }
.share-telegram { background: #229ed9; }
.share-whatsapp { background: #25d366; color: #0f172a; }

.status-indicator {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.8);
}

.units-grid {
    background: var(--arc-surface);
    border-radius: var(--arc-radius-lg);
    padding: clamp(1.5rem, 3vw, 2rem);
    border: 1px solid rgba(148, 163, 184, 0.25);
    box-shadow: var(--arc-shadow-sm);
}

.units-grid-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--arc-text);
    margin-bottom: 1rem;
}

.units-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.units-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-radius: var(--arc-radius-sm);
    background: #f1f5f9;
    font-size: 1rem;
    font-weight: 600;
    color: var(--arc-text);
}

.units-list li span {
    color: var(--arc-muted);
}

.units-list li span.units-value {
    color: var(--arc-text);
}

.content-section {
    margin-top: clamp(2.5rem, 4vw, 3.5rem);
}

.content-block {
    background: var(--arc-surface);
    border-radius: var(--arc-radius-lg);
    padding: clamp(2rem, 4vw, 2.75rem);
    border: 1px solid rgba(148, 163, 184, 0.25);
    box-shadow: var(--arc-shadow-sm);
    margin-bottom: clamp(2rem, 3vw, 2.5rem);
}

.content-block h2 {
    font-size: clamp(1.5rem, 3vw, 1.85rem);
    font-weight: 800;
    color: var(--arc-text);
    margin-bottom: 1.25rem;
    line-height: 1.3;
}

.content-block h3 {
    font-size: clamp(1.2rem, 2.5vw, 1.4rem);
    font-weight: 700;
    color: var(--arc-text);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.content-block p {
    font-size: 1rem;
    color: var(--arc-muted);
    line-height: 1.8;
    margin-bottom: 1.2rem;
}

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

.angle-type-card {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.03) 0%, rgba(14, 165, 233, 0.03) 100%);
    border: 2px solid rgba(37, 99, 235, 0.15);
    border-radius: var(--arc-radius-md);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.angle-type-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.12);
    border-color: rgba(37, 99, 235, 0.3);
}

.angle-visual {
    width: 90px;
    height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #ffffff;
    border-radius: 50%;
    box-shadow: 0 3px 8px rgba(15, 23, 42, 0.06);
    padding: 0.75rem;
}

.angle-visual svg {
    width: 100%;
    height: 100%;
}

.angle-info {
    text-align: center;
    width: 100%;
}

.angle-info h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--arc-text);
    margin: 0 0 0.75rem 0;
}

.angle-measures {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.4rem;
    align-items: center;
}

.measure-item {
    display: inline-block;
    background: rgba(37, 99, 235, 0.1);
    color: var(--arc-primary);
    padding: 0.35rem 0.6rem;
    border-radius: 0.4rem;
    font-size: 0.85rem;
    font-weight: 600;
    text-align: center;
}

.angle-visual.acute-angle svg line,
.angle-visual.acute-angle svg path {
    stroke: #2563eb;
    fill: #2563eb;
}

.angle-visual.right-angle svg line,
.angle-visual.right-angle svg path {
    stroke: #22c55e;
    fill: #22c55e;
}

.angle-visual.obtuse-angle svg line,
.angle-visual.obtuse-angle svg path {
    stroke: #f59e0b;
    fill: #f59e0b;
}

.angle-visual.straight-angle svg line,
.angle-visual.straight-angle svg path {
    stroke: #64748b;
    fill: #64748b;
}

.angle-visual.reflex-angle svg line,
.angle-visual.reflex-angle svg path {
    stroke: #8b5cf6;
    fill: #8b5cf6;
}

.angle-visual.full-angle svg circle,
.angle-visual.full-angle svg line {
    stroke: #ef4444;
}

@media (max-width: 768px) {
    .angle-types-infographic {
        grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
        gap: 0.85rem;
    }

    .angle-type-card {
        padding: 0.85rem;
    }

    .angle-visual {
        width: 80px;
        height: 80px;
    }

    .angle-info h4 {
        font-size: 1rem;
        margin-bottom: 0.6rem;
    }

    .angle-measures {
        gap: 0.35rem;
    }

    .measure-item {
        font-size: 0.8rem;
        padding: 0.3rem 0.5rem;
    }

    .units-list {
        grid-template-columns: 1fr;
    }

    .action-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
    }

    .copy-row {
        flex-direction: column;
    }

    .copy-row .btn-copy {
        width: 100%;
    }

    .share-grid {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    }
}

@media (max-width: 576px) {
    .angle-types-infographic {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    .angle-type-card {
        padding: 0.75rem;
    }

    .angle-visual {
        width: 70px;
        height: 70px;
        padding: 0.5rem;
    }

    .angle-info h4 {
        font-size: 0.95rem;
        margin-bottom: 0.5rem;
    }

    .angle-measures {
        grid-template-columns: 1fr;
        gap: 0.3rem;
    }

    .measure-item {
        font-size: 0.75rem;
        padding: 0.25rem 0.4rem;
    }

    .conversion-workspace {
        padding: 1.5rem;
    }

    .output-display {
        border-radius: 1.25rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}


.visual-comparison {
    margin: 2rem 0;
    padding: 1.5rem;
    background: #f8fafc;
    border-radius: var(--arc-radius-md);
    border: 1px solid rgba(148, 163, 184, 0.25);
}

.visual-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--arc-text);
    margin-bottom: 1.5rem;
    text-align: center;
}

.circle-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 2rem;
    justify-items: center;
}

.circle-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.circle-svg {
    width: 100%;
    max-width: 180px;
    height: auto;
}