/* ==========================================================================
   The VFX Mentor — Shared Header & Mobile Menu
   Standalone: can be loaded by any page (landing, quicktips, advisory, etc.)
   Requires: Inter + JetBrains Mono fonts loaded by the consuming page
   ========================================================================== */

/* --- Design Tokens (header needs these) --- */
:root {
    --bg-primary: #0C1017;
    --bg-surface: #131821;
    --bg-elevated: #1A2030;
    --text-primary: #F3F4F6;
    --text-secondary: #A7B0BC;
    --text-muted: #8B929C;
    --accent: #3B97D3;
    --accent-hover: #2880BA;
    --cta: #E0B400;
    --cta-hover: #C9A000;
    --cta-text: #0C1017;
    --border: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 3rem;
    --radius: 8px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Accessibility --- */
.skip-to-content {
    position: absolute;
    left: -9999px;
    top: 0;
    z-index: 9999;
    padding: 8px 16px;
    background: var(--accent);
    color: #fff;
    text-decoration: none;
    font-size: 14px;
    font-family: var(--font-primary);
}

.skip-to-content:focus {
    left: 0;
}

/* --- Header Bar --- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    max-width: 100vw;
    z-index: 1000;
    background: rgba(15, 17, 21, 0.55);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    transition: background var(--transition);
    font-family: var(--font-primary);
    box-sizing: border-box;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow: hidden;
}

.site-header *,
.site-header *::before,
.site-header *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.site-header .container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.site-header .logo {
    text-decoration: none;
    flex-shrink: 0;
}

.site-header .logo img {
    height: 36px;
    width: auto;
    max-width: 100%;
    opacity: 0.9;
    transition: opacity var(--transition);
    display: block;
}

.site-header .logo:hover img {
    opacity: 1;
}

/* --- Desktop Navigation --- */
.site-header .main-nav ul {
    display: flex;
    list-style: none;
    gap: 28px;
    margin: 0;
    padding: 0;
    font-size: 14px;
    align-items: center;
}

.site-header .main-nav a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color var(--transition);
    letter-spacing: 0;
}

.site-header .main-nav a:visited {
    color: var(--text-muted);
}

.site-header .main-nav a:hover {
    color: var(--text-primary);
}

.site-header .main-nav .nav-cta a {
    background: var(--cta) !important;
    color: var(--cta-text) !important;
    padding: 8px 18px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 13px;
    display: inline-block;
}

.site-header .main-nav .nav-cta a:hover {
    background: var(--cta-hover);
    box-shadow: 0 0 16px rgba(224, 180, 0, 0.2);
}

.site-header .main-nav .nav-cta a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.site-header .main-nav .nav-cta:focus,
.site-header .main-nav .nav-cta:focus-visible,
.site-header .main-nav li.nav-cta:focus,
.site-header .main-nav li.nav-cta:focus-visible {
    outline: none !important;
    box-shadow: none !important;
}

.site-header .main-nav .nav-cta {
    outline: none;
    background: transparent !important;
    background-color: transparent !important;
}

/* --- Mobile Menu Toggle (hamburger) --- */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
    position: relative;
    flex-shrink: 0;
}

/* Pure CSS hamburger icon */
.hamburger-icon {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    position: relative;
    transition: background 0.2s ease;
}

.hamburger-icon::before,
.hamburger-icon::after {
    content: '';
    position: absolute;
    left: 0;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    transition: transform 0.3s ease, top 0.3s ease;
}

.hamburger-icon::before { top: -7px; }
.hamburger-icon::after  { top: 7px; }

/* X state when menu is open */
.mobile-menu-toggle[aria-expanded="true"] .hamburger-icon {
    background: transparent;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-icon::before {
    top: 0;
    transform: rotate(45deg);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-icon::after {
    top: 0;
    transform: rotate(-45deg);
}

/* --- Mobile Menu Overlay --- */
.mobile-menu {
    position: fixed;
    inset: 0;
    z-index: 999;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    font-family: var(--font-primary);
}

.mobile-menu.is-open {
    opacity: 1;
    visibility: visible;
}

.mobile-menu-nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.mobile-menu-nav a {
    font-size: 20px;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 12px 24px;
    transition: color var(--transition);
    min-height: 48px;
    display: flex;
    align-items: center;
}

.mobile-menu-nav a:hover,
.mobile-menu-nav a:focus {
    color: var(--text-primary);
}

.mobile-menu-nav a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.mobile-menu-nav .mobile-menu-cta {
    margin-top: var(--space-sm);
    background: var(--cta);
    color: var(--cta-text);
    font-weight: 600;
    font-size: 16px;
    padding: 14px 32px;
    border-radius: var(--radius);
    transition: background var(--transition);
}

.mobile-menu-nav .mobile-menu-cta:hover {
    background: var(--cta-hover);
    color: var(--cta-text);
}

/* --- Responsive: show hamburger, hide desktop nav --- */
@media (max-width: 900px) {
    .site-header .main-nav {
        display: none;
    }

    .mobile-menu-toggle {
        display: block;
    }
}