:root {
    --ielts-primary: #2563eb;
    --ielts-primary-dark: #1d4ed8;
    --ielts-accent: #0ea5e9;
    --ielts-surface: #ffffff;
    --ielts-border: #e2e8f0;
    --ielts-text: #0f172a;
    --ielts-muted: #64748b;
    --ielts-success: #22c55e;
    --ielts-radius-lg: 1.5rem;
    --ielts-radius-md: 1rem;
    --ielts-radius-sm: 0.75rem;
    --ielts-shadow-sm: 0 8px 24px rgba(15, 23, 42, 0.08);
    --ielts-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;
}

.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;
}

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

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

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

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

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

.breadcrumbs-link:hover {
    color: var(--ielts-primary-dark);
}

.breadcrumbs-current {
    color: var(--ielts-text);
    font-size: 0.9rem;
    font-weight: 600;
}

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

.ielts-hero {
    text-align: center;
    margin-bottom: clamp(1.5rem, 2vw, 2.25rem);
}

.ielts-title {
    font-size: clamp(2.5rem, 6vw, 3.5rem);
    font-weight: 800;
    color: var(--ielts-text);
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.ielts-subtitle {
    font-size: clamp(1.05rem, 2.4vw, 1.35rem);
    color: var(--ielts-muted);
    max-width: 860px;
    margin: 0 auto 1.5rem;
    line-height: 1.6;
}

.ielts-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    padding: 0;
    list-style: none;
    margin: 0;
}

.ielts-pill {
    background: var(--ielts-surface);
    border-radius: 999px;
    padding: 0.55rem 1.25rem;
    font-weight: 600;
    color: var(--ielts-muted);
    border: 1px solid var(--ielts-border);
    box-shadow: var(--ielts-shadow-sm);
    font-size: 0.95rem;
}

.ielts-converter {
    background: var(--ielts-surface);
    border-radius: var(--ielts-radius-lg);
    padding: clamp(1.75rem, 3vw, 2.75rem);
    box-shadow: var(--ielts-shadow-lg);
    border: 1px solid rgba(148, 163, 184, 0.25);
}

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

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

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

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

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

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

.tooltip-trigger {
    border: none;
    background: rgba(37, 99, 235, 0.12);
    color: var(--ielts-primary);
    border-radius: 999px;
    width: 1.75rem;
    height: 1.75rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    cursor: help;
    font-size: 0.85rem;
}

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

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

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

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

.form-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
}

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

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

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

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

.result-card {
    background: linear-gradient(135deg, #1e40af 0%, #2563eb 100%);
    color: #ffffff;
    border-radius: var(--ielts-radius-lg);
    padding: clamp(1.5rem, 3vw, 2rem);
    box-shadow: 0 30px 40px rgba(15, 23, 42, 0.25);
    position: relative;
    overflow: hidden;
}

.result-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top right, rgba(255, 255, 255, 0.1), transparent 55%);
    pointer-events: none;
}

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

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

.result-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-top: 1rem;
}

.result-item {
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--ielts-radius-sm);
    padding: 1rem;
    backdrop-filter: blur(10px);
}

.result-item-label {
    font-size: 0.85rem;
    opacity: 0.9;
    margin-bottom: 0.5rem;
}

.result-item-value {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.result-equation {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-top: 1rem;
    line-height: 1.6;
}

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

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

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

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

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

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

.share-container {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--ielts-radius-md);
    padding: 1rem 1.25rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.share-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: rgba(255, 255, 255, 0.9);
}

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

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

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

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

.conversion-table-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--ielts-text);
    margin-bottom: 1rem;
}

.conversion-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.conversion-table th {
    background: #f8fafc;
    padding: 0.85rem;
    text-align: left;
    font-weight: 700;
    color: var(--ielts-text);
    border-bottom: 2px solid var(--ielts-border);
}

.conversion-table td {
    padding: 0.85rem;
    border-bottom: 1px solid var(--ielts-border);
    color: var(--ielts-text);
}

.conversion-table tr:hover {
    background: #f8fafc;
}

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

.mistakes-card {
    background: var(--ielts-surface);
    border-radius: var(--ielts-radius-lg);
    padding: clamp(2rem, 4vw, 2.75rem);
    border: 1px solid rgba(148, 163, 184, 0.25);
    box-shadow: var(--ielts-shadow-sm);
}

.mistakes-title {
    font-size: 1.65rem;
    font-weight: 800;
    color: var(--ielts-text);
    margin-bottom: 2rem;
}

.mistake-item {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--ielts-border);
}

.mistake-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.mistake-heading {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--ielts-text);
    margin-bottom: 0.75rem;
}

.mistake-item p {
    font-size: 1rem;
    color: var(--ielts-muted);
    line-height: 1.7;
    margin-bottom: 0.75rem;
}

.mistake-item p:last-child {
    margin-bottom: 0;
}

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

.examples-card {
    background: var(--ielts-surface);
    border-radius: var(--ielts-radius-lg);
    padding: clamp(2rem, 4vw, 2.75rem);
    border: 1px solid rgba(148, 163, 184, 0.25);
    box-shadow: var(--ielts-shadow-sm);
}

.examples-title {
    font-size: 1.65rem;
    font-weight: 800;
    color: var(--ielts-text);
    margin-bottom: 2rem;
}

.example-item {
    margin-bottom: 2.5rem;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid var(--ielts-border);
}

.example-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.example-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.example-label {
    background: var(--ielts-primary);
    color: #ffffff;
    padding: 0.4rem 0.85rem;
    border-radius: var(--ielts-radius-sm);
    font-size: 0.85rem;
    font-weight: 700;
}

.example-program {
    font-size: 1rem;
    font-weight: 600;
    color: var(--ielts-text);
}

.example-content {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 1.5rem;
    align-items: start;
    margin-bottom: 1rem;
}

.example-before,
.example-after {
    background: #f8fafc;
    border-radius: var(--ielts-radius-md);
    padding: 1.25rem;
    border: 1px solid var(--ielts-border);
}

.example-subtitle {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--ielts-text);
    margin-bottom: 0.75rem;
}

.example-scores {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.example-scores li {
    font-size: 0.95rem;
    color: var(--ielts-muted);
    font-weight: 600;
}

.example-arrow {
    font-size: 1.5rem;
    color: var(--ielts-primary);
    font-weight: 700;
    display: flex;
    align-items: center;
    padding-top: 1.25rem;
}

.example-note {
    font-size: 0.95rem;
    color: var(--ielts-muted);
    line-height: 1.6;
    margin-top: 1rem;
    padding-left: 1rem;
    border-left: 3px solid var(--ielts-primary);
}

.ielts-how-it-works {
    margin-top: clamp(2.5rem, 4vw, 3.5rem);
    margin-bottom: clamp(2.5rem, 4vw, 3.5rem);
}

.how-it-works-card {
    background: var(--ielts-surface);
    border-radius: var(--ielts-radius-lg);
    padding: clamp(2rem, 4vw, 2.75rem);
    border: 1px solid rgba(148, 163, 184, 0.25);
    box-shadow: var(--ielts-shadow-sm);
}

.how-it-works-title {
    font-size: 1.65rem;
    font-weight: 800;
    color: var(--ielts-text);
    margin-bottom: 1.5rem;
}

.how-it-works-card > p {
    font-size: 1rem;
    color: var(--ielts-muted);
    line-height: 1.7;
    margin-bottom: 2rem;
}

.process-step {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    align-items: flex-start;
}

.process-step:last-child {
    margin-bottom: 0;
}

.step-number {
    flex-shrink: 0;
    width: 2.5rem;
    height: 2.5rem;
    background: linear-gradient(135deg, var(--ielts-primary) 0%, var(--ielts-primary-dark) 100%);
    color: #ffffff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 800;
}

.step-content {
    flex: 1;
}

.step-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--ielts-text);
    margin-bottom: 0.5rem;
}

.step-content p {
    font-size: 1rem;
    color: var(--ielts-muted);
    line-height: 1.7;
    margin: 0;
}

.accuracy-note {
    margin-top: 2rem;
    padding: 1.25rem 1.5rem;
    background: rgba(34, 197, 94, 0.08);
    border: 1px solid rgba(34, 197, 94, 0.25);
    border-radius: var(--ielts-radius-md);
}

.accuracy-note p {
    font-size: 0.95rem;
    color: var(--ielts-muted);
    line-height: 1.6;
    margin: 0;
}

.accuracy-note strong {
    color: #16a34a;
    font-weight: 700;
}

.ielts-tips-sidebar {
    margin-top: clamp(2.5rem, 4vw, 3.5rem);
    margin-bottom: clamp(2.5rem, 4vw, 3.5rem);
}

.tips-card {
    background: var(--ielts-surface);
    border-radius: var(--ielts-radius-lg);
    padding: clamp(1.75rem, 3vw, 2.25rem);
    border: 1px solid rgba(148, 163, 184, 0.25);
    box-shadow: var(--ielts-shadow-sm);
    border-left: 4px solid var(--ielts-primary);
}

.tips-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--ielts-text);
    margin-bottom: 1.25rem;
}

.tips-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.tips-list li {
    font-size: 0.95rem;
    color: var(--ielts-muted);
    line-height: 1.6;
    padding-left: 1.5rem;
    position: relative;
}

.tips-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--ielts-primary);
    font-weight: 700;
}

.ielts-limitations {
    margin-top: clamp(2.5rem, 4vw, 3.5rem);
    margin-bottom: clamp(2.5rem, 4vw, 3.5rem);
}

.limitations-card {
    background: var(--ielts-surface);
    border-radius: var(--ielts-radius-lg);
    padding: clamp(2rem, 4vw, 2.75rem);
    border: 1px solid rgba(148, 163, 184, 0.25);
    box-shadow: var(--ielts-shadow-sm);
}

.limitations-title {
    font-size: 1.65rem;
    font-weight: 800;
    color: var(--ielts-text);
    margin-bottom: 1.5rem;
}

.limitations-card p {
    font-size: 1rem;
    color: var(--ielts-muted);
    line-height: 1.7;
    margin-bottom: 1.25rem;
}

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

@media (max-width: 991px) {
    .ielts-converter {
        padding: 1.75rem;
    }
}

@media (max-width: 768px) {
    .ielts-page {
        padding: 2rem 0 3rem;
    }

    .breadcrumbs {
        margin-bottom: 1.25rem;
    }

    .breadcrumbs-link,
    .breadcrumbs-current {
        font-size: 0.85rem;
    }

    .form-actions {
        flex-direction: column;
        align-items: stretch;
    }

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

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

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

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

    .result-grid {
        grid-template-columns: 1fr;
    }

    .score-visualization {
        grid-template-columns: 1fr;
    }

    .example-content {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .example-arrow {
        transform: rotate(90deg);
        padding: 0;
        justify-content: center;
    }

    .process-step {
        flex-direction: column;
        gap: 1rem;
    }

    .step-number {
        align-self: flex-start;
    }
}

@media (max-width: 576px) {
    .ielts-converter {
        padding: 1.5rem;
    }

    .result-card {
        border-radius: 1.25rem;
    }

    .ielts-pills {
        gap: 0.5rem;
    }

    .breadcrumbs-link,
    .breadcrumbs-current {
        font-size: 0.8rem;
    }
}

@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;
    }
}