/* ==========================================================================
   bestnikoncamera.com — Precision 55mm Z-Mount Optical Lab & 3D Kit Builder
   WCAG 2.1 AA Verified Dark & Light Mode Design Tokens
   ========================================================================== */

:root {
    --nikon-bg-primary: #090d16;
    --nikon-bg-secondary: #0f172a;
    --nikon-bg-elevated: #162033;
    --nikon-border: rgba(234, 179, 8, 0.24);
    --nikon-border-subtle: rgba(148, 163, 184, 0.18);
    --nikon-text-primary: #f8fafc;
    --nikon-text-secondary: #cbd5e1;
    --nikon-text-muted: #94a3b8;
    --nikon-gold: #eab308;
    --nikon-gold-bright: #facc15;
    --nikon-red: #dc2626;
    --nikon-cyan: #38bdf8;
    --nikon-emerald: #10b981;
    --nikon-font-sans: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --nikon-font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

html[data-theme='light'],
body.light-theme {
    --nikon-bg-primary: #f8fafc;
    --nikon-bg-secondary: #ffffff;
    --nikon-bg-elevated: #f1f5f9;
    --nikon-border: rgba(180, 83, 9, 0.28);
    --nikon-border-subtle: rgba(15, 23, 42, 0.14);
    --nikon-text-primary: #0f172a;
    --nikon-text-secondary: #334155;
    --nikon-text-muted: #475569;
    --nikon-gold: #b45309;
    --nikon-gold-bright: #92400e;
    --nikon-cyan: #0369a1;
    --nikon-emerald: #047857;
}

* {
    box-sizing: border-box;
}

body.bestnikon-body {
    margin: 0;
    padding: 0;
    background-color: var(--nikon-bg-primary);
    color: var(--nikon-text-primary);
    font-family: var(--nikon-font-sans);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--nikon-gold-bright);
    text-decoration: none;
    transition: color 0.18s ease, opacity 0.18s ease;
}

a:hover {
    color: var(--nikon-cyan);
}

/* Nominative Fair-Use Legal Topbar */
.nikon-legal-topbar {
    background: linear-gradient(90deg, #05080f 0%, #111827 50%, #05080f 100%);
    border-bottom: 1px solid var(--nikon-border-subtle);
    padding: 0.45rem 1.25rem;
    font-size: 0.78rem;
    color: var(--nikon-text-secondary);
    text-align: center;
}

/* Header & Navigation */
.nikon-site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(9, 13, 22, 0.92);
    backdrop-filter: blur(14px);
    border-bottom: 2px solid var(--nikon-gold);
}

.nikon-header-inner {
    max-width: 1380px;
    margin: 0 auto;
    padding: 0.85rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.nikon-brand-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--nikon-text-primary);
    font-weight: 800;
    font-size: 1.2rem;
    letter-spacing: -0.02em;
}

.nikon-z-ring-badge {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: 2.5px solid var(--nikon-gold);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--nikon-font-mono);
    font-weight: 800;
    font-size: 0.92rem;
    color: var(--nikon-gold-bright);
    background: radial-gradient(circle, rgba(234, 179, 8, 0.2) 0%, rgba(9, 13, 22, 0.95) 75%);
    box-shadow: 0 0 14px rgba(234, 179, 8, 0.25);
}

.nikon-brand-sub {
    display: block;
    font-family: var(--nikon-font-mono);
    font-size: 0.68rem;
    color: var(--nikon-cyan);
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.nikon-nav-links {
    display: flex;
    align-items: center;
    gap: 1.15rem;
    flex-wrap: wrap;
}

.nikon-nav-link {
    color: var(--nikon-text-secondary);
    font-weight: 600;
    font-size: 0.92rem;
    padding: 0.35rem 0.6rem;
    border-radius: 6px;
}

.nikon-nav-link:hover {
    color: var(--nikon-text-primary);
    background: rgba(234, 179, 8, 0.12);
}

.nikon-nav-cta {
    background: linear-gradient(135deg, #eab308 0%, #ca8a04 100%);
    color: #090d16 !important;
    font-weight: 800;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.88rem;
    letter-spacing: 0.01em;
}

.nikon-lang-pills {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    border: 1px solid var(--nikon-border-subtle);
    border-radius: 6px;
    padding: 0.2rem;
}

.nikon-lang-pill {
    font-family: var(--nikon-font-mono);
    font-size: 0.74rem;
    padding: 0.2rem 0.45rem;
    border-radius: 4px;
    color: var(--nikon-text-secondary);
}

.nikon-lang-pill.active {
    background: var(--nikon-gold);
    color: #090d16;
    font-weight: 700;
}

/* Main Shell & Grid */
.nikon-main-container {
    max-width: 1380px;
    margin: 0 auto;
    padding: 2rem 1.5rem 4rem;
}

.nikon-content-with-sidebar {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: 2.25rem;
    align-items: start;
}

@media (max-width: 1024px) {
    .nikon-content-with-sidebar {
        grid-template-columns: 1fr;
    }
}

/* Hero Banner */
.nikon-hero {
    background: radial-gradient(circle at 82% 22%, rgba(234, 179, 8, 0.16) 0%, rgba(56, 189, 248, 0.08) 38%, rgba(15, 23, 42, 0.96) 78%);
    border: 1px solid var(--nikon-border);
    border-left: 5px solid var(--nikon-red);
    border-radius: 16px;
    padding: 2.5rem 2.25rem;
    margin-bottom: 2.25rem;
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.42);
}

.nikon-eyebrow {
    display: inline-block;
    font-family: var(--nikon-font-mono);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--nikon-gold-bright);
    background: rgba(234, 179, 8, 0.12);
    border: 1px solid var(--nikon-border);
    padding: 0.3rem 0.75rem;
    border-radius: 999px;
    margin-bottom: 1rem;
}

.nikon-hero h1 {
    font-size: clamp(1.85rem, 3.3vw, 2.75rem);
    line-height: 1.18;
    margin: 0 0 1rem;
    color: var(--nikon-text-primary);
    letter-spacing: -0.025em;
}

.nikon-hero p.lead,
p.lead {
    font-size: 1.1rem;
    color: var(--nikon-text-secondary);
    max-width: 860px;
    margin: 0 0 1.5rem;
}

.nikon-hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.9rem;
    align-items: center;
}

.nikon-btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, #eab308 0%, #ca8a04 100%);
    color: #090d16 !important;
    font-weight: 800;
    padding: 0.8rem 1.45rem;
    border-radius: 10px;
    font-size: 0.96rem;
    border: none;
    cursor: pointer;
    box-shadow: 0 8px 22px rgba(234, 179, 8, 0.28);
}

.nikon-btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--nikon-bg-elevated);
    color: var(--nikon-text-primary) !important;
    border: 1px solid var(--nikon-border-subtle);
    font-weight: 600;
    padding: 0.78rem 1.3rem;
    border-radius: 10px;
    font-size: 0.94rem;
    cursor: pointer;
}

.nikon-btn-secondary.is-active,
.nikon-btn-secondary:hover {
    border-color: var(--nikon-gold);
    color: var(--nikon-gold-bright) !important;
}

/* 3D Kit Builder Workbench */
.nikon-builder-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.95fr);
    gap: 1.75rem;
    margin-bottom: 2.5rem;
}

@media (max-width: 1080px) {
    .nikon-builder-grid {
        grid-template-columns: 1fr;
    }
}

.nikon-viewport-card,
.nikon-controls-card,
.nikon-section-card {
    background: var(--nikon-bg-secondary);
    border: 1px solid var(--nikon-border-subtle);
    border-radius: 14px;
    padding: 1.5rem;
}

.nikon-canvas-stage {
    width: 100%;
    height: 410px;
    background: radial-gradient(circle at 50% 42%, #17233b 0%, #090d16 78%);
    border: 1px solid var(--nikon-border);
    border-radius: 12px;
    position: relative;
    overflow: hidden;
    margin: 1rem 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nikon-hud-overlay {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.6rem 0.9rem;
    background: rgba(9, 13, 22, 0.85);
    border: 1px solid var(--nikon-border-subtle);
    border-radius: 8px;
    font-family: var(--nikon-font-mono);
    font-size: 0.8rem;
    color: var(--nikon-cyan);
}

.nikon-toolbar-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
    margin-top: 0.85rem;
}

.nikon-preset-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.nikon-preset-btn {
    background: var(--nikon-bg-elevated);
    color: var(--nikon-text-primary);
    border: 1px solid var(--nikon-border-subtle);
    border-left: 3px solid var(--nikon-gold);
    border-radius: 9px;
    padding: 0.7rem 0.95rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.86rem;
    cursor: pointer;
}

.nikon-preset-btn:hover {
    border-color: var(--nikon-gold);
    background: rgba(234, 179, 8, 0.1);
}

.nikon-slot-group {
    margin-bottom: 1.05rem;
}

.nikon-slot-label {
    display: block;
    font-size: 0.84rem;
    font-weight: 700;
    color: var(--nikon-gold-bright);
    margin-bottom: 0.35rem;
    font-family: var(--nikon-font-mono);
}

.nikon-slot-select {
    width: 100%;
    padding: 0.68rem 0.85rem;
    border-radius: 8px;
    background: var(--nikon-bg-elevated);
    color: var(--nikon-text-primary);
    border: 1px solid var(--nikon-border-subtle);
    font-size: 0.9rem;
    font-family: var(--nikon-font-sans);
}

/* Telemetry Readout Cards */
.nikon-metrics-strip {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(175px, 1fr));
    gap: 0.85rem;
    margin: 1.25rem 0;
}

.nikon-metric-box {
    background: var(--nikon-bg-elevated);
    border: 1px solid var(--nikon-border-subtle);
    border-radius: 10px;
    padding: 0.85rem 1rem;
}

.nikon-metric-label {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--nikon-text-muted);
    font-family: var(--nikon-font-mono);
}

.nikon-metric-value {
    display: block;
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--nikon-text-primary);
    margin-top: 0.25rem;
    font-family: var(--nikon-font-mono);
}

.nikon-compat-banner {
    padding: 0.8rem 1rem;
    border-radius: 9px;
    font-family: var(--nikon-font-mono);
    font-size: 0.84rem;
    font-weight: 700;
    margin-bottom: 0.85rem;
}

.nikon-compat-banner.compat-pass {
    background: rgba(16, 185, 129, 0.14);
    border: 1px solid rgba(16, 185, 129, 0.45);
    color: #34d399;
}

.nikon-compat-banner.compat-warn {
    background: rgba(245, 158, 11, 0.16);
    border: 1px solid rgba(245, 158, 11, 0.5);
    color: #fbbf24;
}

.nikon-compat-list {
    margin: 0 0 1.25rem;
    padding-left: 1.2rem;
    font-size: 0.88rem;
    color: var(--nikon-text-secondary);
}

.nikon-msg-warn {
    color: #fcd34d;
    margin-bottom: 0.35rem;
}

.nikon-msg-ok {
    color: #a7f3d0;
    margin-bottom: 0.35rem;
}

/* Tables, Callouts & Article Typography */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    margin: 1.5rem 0;
    border-radius: 10px;
    border: 1px solid var(--nikon-border-subtle);
}

table.table {
    width: 100%;
    border-collapse: collapse;
    background: var(--nikon-bg-secondary);
    font-size: 0.9rem;
}

table.table th,
table.table td {
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--nikon-border-subtle);
    text-align: left;
    vertical-align: top;
}

table.table th {
    background: var(--nikon-bg-elevated);
    color: var(--nikon-gold-bright);
    font-family: var(--nikon-font-mono);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

table.table code,
code {
    font-family: var(--nikon-font-mono);
    background: rgba(56, 189, 248, 0.12);
    color: var(--nikon-cyan);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.84em;
}

.callout {
    background: linear-gradient(135deg, rgba(234, 179, 8, 0.1) 0%, rgba(15, 23, 42, 0.9) 100%);
    border-left: 4px solid var(--nikon-gold);
    border-radius: 10px;
    padding: 1.2rem 1.4rem;
    margin: 1.5rem 0;
    color: var(--nikon-text-secondary);
}

.nikon-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.35rem;
    margin: 1.5rem 0;
}

.nikon-card {
    background: var(--nikon-bg-secondary);
    border: 1px solid var(--nikon-border-subtle);
    border-radius: 12px;
    padding: 1.35rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.nikon-card h3 {
    margin-top: 0;
    color: var(--nikon-text-primary);
    font-size: 1.12rem;
}

.nikon-badge {
    display: inline-block;
    font-family: var(--nikon-font-mono);
    font-size: 0.74rem;
    padding: 0.2rem 0.55rem;
    border-radius: 5px;
    background: rgba(234, 179, 8, 0.15);
    color: var(--nikon-gold-bright);
    margin-bottom: 0.6rem;
}

/* Sidebar & Footer */
.nikon-sidebar-box {
    background: var(--nikon-bg-secondary);
    border: 1px solid var(--nikon-border-subtle);
    border-radius: 12px;
    padding: 1.35rem;
    margin-bottom: 1.5rem;
}

.nikon-sidebar-box h3 {
    margin-top: 0;
    font-size: 1rem;
    color: var(--nikon-gold-bright);
    font-family: var(--nikon-font-mono);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nikon-site-footer {
    background: #05080f;
    border-top: 1px solid var(--nikon-border-subtle);
    padding: 3rem 1.5rem;
    margin-top: 4rem;
    color: var(--nikon-text-secondary);
    font-size: 0.88rem;
}

.nikon-footer-inner {
    max-width: 1380px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.nikon-disclaimer-box {
    margin-top: 2rem;
    padding: 1rem 1.25rem;
    border-radius: 8px;
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--nikon-border-subtle);
    font-size: 0.8rem;
    color: var(--nikon-text-muted);
}

/* Contact Form */
.nikon-form-group {
    margin-bottom: 1.15rem;
}

.nikon-form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--nikon-text-primary);
}

.nikon-form-input,
.nikon-form-textarea {
    width: 100%;
    padding: 0.75rem 0.9rem;
    border-radius: 8px;
    border: 1px solid var(--nikon-border-subtle);
    background: var(--nikon-bg-elevated);
    color: var(--nikon-text-primary);
    font-family: var(--nikon-font-sans);
    font-size: 0.95rem;
}

/* Blender 5.2.2 LTS CAD & glTF Asset Showcase */
.nikon-blender-showcase-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 1.5rem;
    align-items: center;
    margin: 1.25rem 0 1.75rem;
}

@media (max-width: 960px) {
    .nikon-blender-showcase-grid {
        grid-template-columns: 1fr;
    }
}

.nikon-blender-render-frame {
    background: #060911;
    border: 1px solid var(--nikon-border);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 14px 32px rgba(0, 0, 0, 0.45);
}

.nikon-blender-render-img {
    display: block;
    width: 100%;
    height: auto;
    border-bottom: 1px solid var(--nikon-border-subtle);
}

.nikon-blender-render-caption {
    padding: 0.65rem 0.95rem;
    font-family: var(--nikon-font-mono);
    font-size: 0.78rem;
    color: var(--nikon-text-secondary);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
}