/* ===============================================
   Advanced CSS Page Styles
   =============================================== */

/* Modern Complex Selectors Demos */
.is-demo {
    padding: 24px;
    background: var(--color-surface, #f8fafc);
    border-radius: 12px;
}

.is-demo h4 {
    margin: 0 0 16px 0;
}

.is-demo :is(section, article, aside) h4 {
    color: #2563eb;
    font-weight: 700;
}

.is-demo article,
.is-demo aside {
    padding: 16px;
    background: white;
    border-radius: 8px;
    margin-top: 16px;
    border: 2px solid var(--color-border, #e2e8f0);
}

.dark .is-demo article,
.dark .is-demo aside {
    background: var(--color-background, #0f172a);
}

/* :where() Demo */
.where-demo {
    display: flex;
    gap: 16px;
    padding: 24px;
    background: var(--color-surface, #f8fafc);
    border-radius: 12px;
}

.where-demo :where(a) {
    color: #64748b;
    text-decoration: none;
    padding: 12px 24px;
    background: white;
    border: 2px solid var(--color-border, #e2e8f0);
    border-radius: 8px;
    transition: all 0.2s ease;
}

.where-demo .link-special {
    color: #7c3aed;
    font-weight: 600;
    border-color: #7c3aed;
}

.where-demo a:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* :not() Demo */
.not-demo {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 24px;
    background: var(--color-surface, #f8fafc);
    border-radius: 12px;
}

.not-demo button:not(.primary) {
    background: #f1f5f9;
    color: #334155;
    border: 1px solid #cbd5e1;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.not-demo button:not(.primary):hover {
    background: #e2e8f0;
}

.not-demo button.primary {
    background: #2563eb;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.not-demo button.primary:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

/* Pseudo-elements Demos */
.pseudo-demo {
    padding: 24px;
    background: var(--color-surface, #f8fafc);
    border-radius: 12px;
}

.badge-demo {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.badge {
    padding: 8px 16px;
    background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
    color: white;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.875rem;
}

.badge::before {
    content: '★ ';
    opacity: 0.7;
}

.badge::after {
    content: ' ★';
    opacity: 0.7;
}

.badge-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.badge-warning {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

/* Drop Cap Demo */
.dropcap-demo {
    padding: 24px;
    background: var(--color-surface, #f8fafc);
    border-radius: 12px;
}

.dropcap-text {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--color-text, #1e293b);
}

.dropcap-text::first-letter {
    font-size: 3.5em;
    font-weight: 700;
    float: left;
    line-height: 0.9;
    margin: 0.1em 0.15em 0 0;
    color: #2563eb;
}

.dropcap-text::first-line {
    font-variant: small-caps;
    font-weight: 600;
    color: #475569;
}

/* Selection Demo */
.selection-demo {
    padding: 24px;
    background: var(--color-surface, #f8fafc);
    border-radius: 12px;
}

.selection-demo p {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--color-text, #1e293b);
}

.selection-demo ::selection {
    background: #2563eb;
    color: white;
}

.selection-demo ::-moz-selection {
    background: #2563eb;
    color: white;
}

/* CSS Counters Demos */
.counter-demo {
    counter-reset: step;
    padding: 24px;
    background: var(--color-surface, #f8fafc);
    border-radius: 12px;
}

.step-item {
    padding: 16px;
    margin-bottom: 12px;
    background: white;
    border-radius: 8px;
    border: 2px solid var(--color-border, #e2e8f0);
    transition: all 0.2s ease;
}

.dark .step-item {
    background: var(--color-background, #0f172a);
}

.step-item:hover {
    transform: translateX(8px);
    border-color: #2563eb;
}

.step-item::before {
    counter-increment: step;
    content: 'Step ' counter(step) ': ';
    font-weight: 700;
    color: #2563eb;
}

/* Nested Counters Demo */
.nested-counter-demo {
    counter-reset: section;
    padding: 24px;
    background: var(--color-surface, #f8fafc);
    border-radius: 12px;
}

.section-item {
    counter-reset: subsection;
    counter-increment: section;
    padding: 16px;
    margin-bottom: 12px;
    background: white;
    border-radius: 8px;
    border: 2px solid var(--color-border, #e2e8f0);
    font-weight: 600;
}

.dark .section-item {
    background: var(--color-background, #0f172a);
}

.section-item::before {
    content: counter(section) '. ';
    font-weight: 700;
    color: #2563eb;
}

.subsection-item {
    padding: 12px 16px;
    margin: 8px 0 8px 32px;
    background: var(--color-surface, #f8fafc);
    border-radius: 6px;
    border-left: 3px solid #7c3aed;
}

.subsection-item::before {
    counter-increment: subsection;
    content: counter(section) '.' counter(subsection) ' ';
    font-weight: 600;
    color: #7c3aed;
}

/* Attribute Selectors Demos */
.attribute-demo {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 24px;
    background: var(--color-surface, #f8fafc);
    border-radius: 12px;
}

.attribute-demo input[type] {
    padding: 12px 16px;
    border: 2px solid #cbd5e1;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.2s ease;
}

.attribute-demo input[type]:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.attribute-demo input[type="email"] {
    border-color: #2563eb;
}

.attribute-demo input[type="password"] {
    border-color: #7c3aed;
}

.attribute-demo button[disabled] {
    padding: 12px 24px;
    background: #f1f5f9;
    color: #94a3b8;
    border: 2px solid #cbd5e1;
    border-radius: 8px;
    font-size: 1rem;
    opacity: 0.5;
    cursor: not-allowed;
}

/* Advanced Attribute Demo */
.advanced-attribute-demo {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 24px;
    background: var(--color-surface, #f8fafc);
    border-radius: 12px;
}

.advanced-attribute-demo a {
    padding: 12px 16px;
    background: white;
    border: 2px solid var(--color-border, #e2e8f0);
    border-radius: 8px;
    color: var(--color-text, #1e293b);
    text-decoration: none;
    transition: all 0.2s ease;
}

.dark .advanced-attribute-demo a {
    background: var(--color-background, #0f172a);
}

.advanced-attribute-demo a:hover {
    border-color: #2563eb;
    transform: translateX(4px);
}

.advanced-attribute-demo a[href^="https://"]::after {
    content: ' ↗';
    font-size: 0.85em;
    opacity: 0.7;
}

.advanced-attribute-demo a[href$=".pdf"]::before {
    content: '📄 ';
}

.advanced-attribute-demo a[href*="image"]::before {
    content: '🖼️ ';
}

/* Combinators Demos */
.combinator-demo {
    padding: 24px;
    background: var(--color-surface, #f8fafc);
    border-radius: 12px;
    margin-bottom: 24px;
}

.descendant-demo p {
    color: #2563eb;
    font-weight: 600;
    padding: 12px;
    background: white;
    border-radius: 6px;
    margin: 8px 0;
    border: 2px solid var(--color-border, #e2e8f0);
}

.dark .descendant-demo p {
    background: var(--color-background, #0f172a);
}

.child-demo > p {
    color: #7c3aed;
    font-weight: 600;
    padding: 12px;
    background: white;
    border-radius: 6px;
    margin: 8px 0;
    border: 2px solid #7c3aed;
}

.dark .child-demo > p {
    background: var(--color-background, #0f172a);
}

.child-demo > div p {
    color: var(--color-text-secondary, #64748b);
    font-weight: 400;
    border-color: var(--color-border, #e2e8f0);
}

.sibling-demo h4 {
    margin: 0 0 16px 0;
    color: var(--color-text, #1e293b);
}

.sibling-demo h4 + p {
    font-weight: 700;
    color: #2563eb;
    padding: 12px;
    background: white;
    border-radius: 6px;
    border: 2px solid #2563eb;
}

.dark .sibling-demo h4 + p {
    background: var(--color-background, #0f172a);
}

.sibling-demo h4 ~ p {
    margin-left: 16px;
    border-left: 3px solid #cbd5e1;
    padding-left: 16px;
    padding-top: 8px;
    padding-bottom: 8px;
}

/* Specificity Demos */
.specificity-demo {
    padding: 24px;
    background: var(--color-surface, #f8fafc);
    border-radius: 12px;
}

.specificity-visual {
    display: grid;
    gap: 16px;
}

.spec-level {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: white;
    border-radius: 8px;
    border: 2px solid var(--color-border, #e2e8f0);
    transition: all 0.2s ease;
}

.dark .spec-level {
    background: var(--color-background, #0f172a);
}

.spec-level:hover {
    transform: translateX(8px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.spec-number {
    font-size: 2rem;
    font-weight: 700;
    font-family: 'Space Mono', monospace;
    min-width: 80px;
}

.spec-inline .spec-number {
    color: #dc2626;
}

.spec-id .spec-number {
    color: #2563eb;
}

.spec-class .spec-number {
    color: #7c3aed;
}

.spec-element .spec-number {
    color: #10b981;
}

.spec-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text, #1e293b);
}

/* Specificity Examples */
.specificity-examples {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-top: 24px;
}

.good-example,
.bad-example {
    padding: 20px;
    background: var(--color-surface, #f8fafc);
    border-radius: 8px;
    border: 2px solid var(--color-border, #e2e8f0);
}

.good-example {
    border-color: #10b981;
}

.bad-example {
    border-color: #ef4444;
}

.good-example h4,
.bad-example h4 {
    margin: 0 0 12px 0;
    font-size: 1rem;
}

.good-example pre,
.bad-example pre {
    margin: 0;
    padding: 12px;
    background: white;
    border-radius: 6px;
    font-size: 0.875rem;
}

.dark .good-example pre,
.dark .bad-example pre {
    background: var(--color-background, #0f172a);
}

/* Tip Box */
.tip-box {
    margin-top: 24px;
    padding: 24px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-left: 4px solid #2563eb;
    border-radius: 8px;
}

.dark .tip-box {
    background: linear-gradient(135deg, #1e3a5f 0%, #1e293b 100%);
    border-left-color: #60a5fa;
}

.tip-box h4 {
    margin: 0 0 12px 0;
    color: var(--color-text, #1e293b);
    font-size: 1.125rem;
}

.tip-box p {
    margin: 0;
    color: var(--color-text, #1e293b);
    line-height: 1.8;
}

.tip-box code {
    background: rgba(37, 99, 235, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.875em;
}

/* Related Links Cards */
.related-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 32px;
}

.related-card {
    padding: 32px;
    background: var(--color-surface, #f8fafc);
    border: 2px solid var(--color-border, #e2e8f0);
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.related-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    border-color: #2563eb;
}

.dark .related-card:hover {
    border-color: #60a5fa;
}

.related-card h3 {
    margin: 0 0 12px 0;
    color: var(--color-text, #1e293b);
    font-size: 1.25rem;
}

.related-card p {
    margin: 0;
    color: var(--color-text-secondary, #64748b);
    line-height: 1.6;
}

/* Responsive Design */
@media (max-width: 768px) {
    .where-demo,
    .not-demo {
        flex-direction: column;
    }

    .specificity-examples {
        grid-template-columns: 1fr;
    }

    .sibling-demo h4 ~ p {
        margin-left: 0;
    }

    .related-links {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .spec-level {
        flex-direction: column;
        text-align: center;
    }

    .spec-number {
        min-width: auto;
    }
}

/* Respect reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
    .step-item,
    .not-demo button,
    .attribute-demo input,
    .advanced-attribute-demo a,
    .related-card,
    .spec-level {
        transition: none !important;
    }
}