@import url('https://fonts.googleapis.com/css2?family=inter:wght@400;500;600;700;800&display=swap');

:root {
    font-size: 16px;
    --color-bg: #0f172a;
    --color-text: #e2e8f0;
    --color-text-muted: #94a3b8;
    --color-text-heading: #ffffff;
    --color-text-strong: #f1f5f9;
    --color-glass-bg: rgba(30, 41, 59, 0.5);
    --color-glass-border: rgba(255, 255, 255, 0.1);
    --color-card-bg: rgba(255, 255, 255, 0.05);
    --color-card-hover: rgba(255, 255, 255, 0.08);
    --color-input-bg: rgba(255, 255, 255, 0.05);
    --color-gradient-text: linear-gradient(135deg, #fbbf24, #06b6d4, #8b5cf6);
    --color-code-bg: rgba(6, 182, 212, 0.1);
    --color-code-text: #22d3ee;
    --color-sidebar-bg: rgba(255, 255, 255, 0.03);
    --color-sidebar-border: rgba(255, 255, 255, 0.1);
    --color-highlight-bg: rgba(30, 41, 59, 0.5);
    --color-nav-hover: #ffffff;
    --color-toc-active: #06b6d4;
    --color-toc-hover-bg: rgba(6, 182, 212, 0.1);
}

html.light {
    --color-bg: #f1f5f9;
    --color-text: #1e293b;
    --color-text-muted: #475569;
    --color-text-heading: #0f172a;
    --color-text-strong: #1e293b;
    --color-glass-bg: rgba(255, 255, 255, 0.7);
    --color-glass-border: rgba(0, 0, 0, 0.08);
    --color-card-bg: rgba(255, 255, 255, 0.8);
    --color-card-hover: rgba(255, 255, 255, 1);
    --color-input-bg: rgba(0, 0, 0, 0.05);
    --color-code-bg: rgba(6, 182, 212, 0.08);
    --color-code-text: #0891b2;
    --color-sidebar-bg: rgba(0, 0, 0, 0.02);
    --color-sidebar-border: rgba(0, 0, 0, 0.08);
    --color-highlight-bg: rgba(241, 245, 249, 0.8);
    --color-nav-hover: #0f172a;
    --color-toc-active: #0891b2;
    --color-toc-hover-bg: rgba(6, 182, 212, 0.06);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'inter', sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.glass-morphism {
    background: var(--color-glass-bg);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid var(--color-glass-border);
}

.glass-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-glass-border);
    transition: all 0.3s ease;
    border-radius: 1rem;
}

.glass-card:hover {
    background: var(--color-card-hover);
    transform: translateY(-5px);
}

.form-element {
    background-color: var(--color-input-bg);
    border: 1px solid var(--color-glass-border);
    color: var(--color-text);
}

.form-element::placeholder {
    color: var(--color-text-muted);
}

.form-element:focus {
    border-color: rgba(6, 182, 212, 0.5);
}

.gradient-text {
    background: var(--color-gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.animate-spin {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.cta-button {
    background-color: #fbbf24;
    color: #0f172a;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(251, 191, 36, 0.2);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(251, 191, 36, 0.3);
}

.secondary-button {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
    color: var(--color-text);
}

.light .secondary-button {
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.secondary-button:hover {
    background: rgba(255, 255, 255, 0.2);
}

.light .secondary-button:hover {
    background: rgba(0, 0, 0, 0.1);
}

.text-muted {
    color: var(--color-text-muted);
}

.article-body {
    color: var(--color-text);
    line-height: 1.8;
}

.article-body p {
    margin-bottom: 1rem;
}

.article-body strong {
    color: var(--color-text-strong);
    font-weight: 700;
}

.article-heading {
    color: var(--color-text-heading);
}

.article-highlight {
    background: var(--color-highlight-bg);
    border: 1px solid var(--color-glass-border);
    border-radius: 0.75rem;
    padding: 1.5rem;
}

.article-sidebar {
    background: var(--color-sidebar-bg);
    border: 1px solid var(--color-sidebar-border);
}

.article-code {
    background: var(--color-code-bg);
    color: var(--color-code-text);
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
    font-size: 0.875rem;
    font-family: 'Courier New', monospace;
}

.article-toc {
    position: sticky;
    top: 6rem;
}

.article-toc a {
    display: block;
    padding: 0.5rem 1rem;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    border-left: 2px solid var(--color-glass-border);
    transition: all 0.2s ease;
    text-decoration: none;
}

.article-toc a:hover {
    color: var(--color-toc-active);
    background: var(--color-toc-hover-bg);
    border-left-color: var(--color-toc-active);
}

.article-toc a.active {
    color: var(--color-toc-active);
    border-left-color: var(--color-toc-active);
    font-weight: 600;
}

.nav-link {
    color: var(--color-text-muted);
    transition: color 0.2s ease;
}

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

.phone-mockup {
    transform: perspective(1000px) rotateY(-5deg) rotateX(5deg);
    transition: transform 0.5s ease;
}

.phone-mockup:hover {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg) scale(1.02);
}

.faq-toggle {
    color: var(--color-text-heading);
}

.faq-toggle .material-icons-outlined {
    transition: transform 0.2s ease;
}

.rotate-180 {
    transform: rotate(180deg);
}

.nav-dropdown-trigger:hover .nav-dropdown,
.nav-dropdown:hover {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

select.form-element {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    border-radius: 3px;
    background: var(--color-glass-border);
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #06b6d4;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(6, 182, 212, 0.3);
}

.article-cta {
    background: linear-gradient(135deg, rgba(251, 191, 36, 0.1), rgba(6, 182, 212, 0.1));
    border: 1px solid var(--color-glass-border);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
}

.related-article {
    background: var(--color-card-bg);
    border: 1px solid var(--color-glass-border);
    border-radius: 0.75rem;
    padding: 1.25rem;
    transition: all 0.3s ease;
    text-decoration: none;
    display: block;
    color: inherit;
}

.related-article:hover {
    background: var(--color-card-hover);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.stat-number {
    background: var(--color-gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
}