/* Shared site navigation — matches home page title bar */
:root,
html[data-theme="light"] {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #7c3aed;
    --accent: #f59e0b;
    --dark: #1e293b;
    --light: #f8fafc;
    --gray: #64748b;
    --gray-light: #e2e8f0;
    --page-bg: #f8fafc;
    --page-fg: #1e293b;
    --muted: #64748b;
    --surface: #ffffff;
    --surface-2: #f1f5f9;
    --border: #e2e8f0;
    --header-bg: rgba(255, 255, 255, 0.95);
    --header-fg: #1e293b;
    --transition: all 0.3s ease;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 12px;
}

html[data-theme="dark"] {
    --primary: #38bdf8;
    --primary-dark: #0ea5e9;
    --secondary: #818cf8;
    --accent: #f59e0b;
    --dark: #e2e8f0;
    --light: #0c0f14;
    --gray: #94a3b8;
    --gray-light: #1e293b;
    --page-bg: #0c0f14;
    --page-fg: #f1f5f9;
    --muted: #94a3b8;
    --surface: #141a22;
    --surface-2: #1c2430;
    --border: rgba(255, 255, 255, 0.1);
    --header-bg: rgba(12, 15, 20, 0.92);
    --header-fg: #e2e8f0;
}

html[data-theme="midnight"] {
    --primary: #a78bfa;
    --primary-dark: #8b5cf6;
    --secondary: #c084fc;
    --accent: #f472b6;
    --dark: #f1f5f9;
    --light: #050508;
    --gray: #a1a1aa;
    --gray-light: #18181b;
    --page-bg: #050508;
    --page-fg: #fafafa;
    --muted: #a1a1aa;
    --surface: #0c0c10;
    --surface-2: #18181b;
    --border: rgba(255, 255, 255, 0.08);
    --header-bg: rgba(5, 5, 8, 0.94);
    --header-fg: #fafafa;
}

html[data-theme="sepia"] {
    --primary: #9a3412;
    --primary-dark: #7c2d12;
    --secondary: #b45309;
    --accent: #c2410c;
    --dark: #3f2e1f;
    --light: #f4ecd8;
    --gray: #7c6a4f;
    --gray-light: #e8dcc4;
    --page-bg: #f4ecd8;
    --page-fg: #3f2e1f;
    --muted: #7c6a4f;
    --surface: #faf3e4;
    --surface-2: #efe4cc;
    --border: #e0d2b4;
    --header-bg: rgba(250, 243, 228, 0.95);
    --header-fg: #3f2e1f;
}

html[data-theme="ocean"] {
    --primary: #0ea5e9;
    --primary-dark: #0284c7;
    --secondary: #14b8a6;
    --accent: #22d3ee;
    --dark: #ecfeff;
    --light: #042f3a;
    --gray: #99f6e4;
    --gray-light: #0b4a5a;
    --page-bg: #042f3a;
    --page-fg: #ecfeff;
    --muted: #5eead4;
    --surface: #0a3d4a;
    --surface-2: #0e4d5c;
    --border: rgba(34, 211, 238, 0.18);
    --header-bg: rgba(4, 47, 58, 0.94);
    --header-fg: #ecfeff;
}

html[data-theme="forest"] {
    --primary: #4ade80;
    --primary-dark: #22c55e;
    --secondary: #34d399;
    --accent: #a3e635;
    --dark: #ecfdf5;
    --light: #052e16;
    --gray: #86efac;
    --gray-light: #14532d;
    --page-bg: #052e16;
    --page-fg: #ecfdf5;
    --muted: #86efac;
    --surface: #064e3b;
    --surface-2: #14532d;
    --border: rgba(74, 222, 128, 0.2);
    --header-bg: rgba(5, 46, 22, 0.94);
    --header-fg: #ecfdf5;
}

html[data-theme] body {
    background-color: var(--page-bg);
    color: var(--page-fg);
}

html[data-theme] .cheat-sheet-page,
html[data-theme] .tools-page,
html[data-theme] .prompt-page {
    background-color: var(--page-bg);
    background-image: none;
    color: var(--page-fg);
}

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.site-header .nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.site-header .logo {
    font-family: 'Inter', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
}

.site-header .logo span {
    color: var(--accent);
}

.site-header .nav-menu {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    align-items: center;
}

.site-header .nav-link {
    text-decoration: none;
    color: var(--header-fg);
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

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

.site-header .nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

.site-header .nav-link:hover::after {
    width: 100%;
}

.site-header .tutorials-link {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white !important;
    padding: 0.5rem 1rem !important;
    border-radius: 50px;
    transition: var(--transition);
}

.site-header .tutorials-link:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--secondary));
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.site-header .tutorials-link::after {
    display: none;
}

.site-header .mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--header-fg);
    cursor: pointer;
}

.appearance-wrap {
    position: relative;
    margin-left: 0.75rem;
    flex-shrink: 0;
}

.appearance-btn {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--header-fg);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.05rem;
    transition: var(--transition);
}

.appearance-btn:hover,
.appearance-btn[aria-expanded="true"] {
    color: var(--primary);
    border-color: var(--primary);
}

.appearance-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 200px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 0.5rem;
    z-index: 1002;
}

.appearance-menu[hidden] {
    display: none;
}

.appearance-menu-label {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
    padding: 0.35rem 0.5rem 0.5rem;
    margin: 0;
}

.appearance-option {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    width: 100%;
    border: none;
    background: transparent;
    color: var(--page-fg);
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    text-align: left;
    padding: 0.5rem 0.6rem;
    border-radius: 8px;
    cursor: pointer;
}

.appearance-option:hover,
.appearance-option.is-active {
    background: var(--surface-2);
    color: var(--primary);
}

.appearance-swatch {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 1px solid var(--border);
    flex-shrink: 0;
}

.appearance-swatch--light { background: linear-gradient(135deg, #f8fafc 50%, #2563eb 50%); }
.appearance-swatch--dark { background: linear-gradient(135deg, #0c0f14 50%, #38bdf8 50%); }
.appearance-swatch--midnight { background: linear-gradient(135deg, #050508 50%, #a78bfa 50%); }
.appearance-swatch--sepia { background: linear-gradient(135deg, #f4ecd8 50%, #9a3412 50%); }
.appearance-swatch--ocean { background: linear-gradient(135deg, #042f3a 50%, #22d3ee 50%); }
.appearance-swatch--forest { background: linear-gradient(135deg, #052e16 50%, #4ade80 50%); }

/* Dropdown menus */
.site-header .nav-dropdown {
    position: relative;
}

.site-header .nav-dropdown-toggle {
    background: none;
    border: none;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--header-fg);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0;
    transition: var(--transition);
}

.site-header .nav-dropdown-toggle:hover {
    color: var(--primary);
}

.site-header .nav-dropdown-toggle i {
    font-size: 0.65rem;
    transition: transform 0.2s ease;
}

.site-header .nav-dropdown.open .nav-dropdown-toggle i,
.site-header .nav-dropdown:hover .nav-dropdown-toggle i {
    transform: rotate(180deg);
}

.site-header .nav-dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    min-width: 200px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    box-shadow: var(--shadow);
    list-style: none;
    padding: 0.5rem 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(6px);
    transition: all 0.2s ease;
    z-index: 1001;
}

.site-header .nav-dropdown:hover .nav-dropdown-menu,
.site-header .nav-dropdown.open .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Desktop: only show submenu on hover, not when .open is left from mobile */
@media (min-width: 769px) {
    .site-header .nav-dropdown.open:not(:hover) .nav-dropdown-menu {
        opacity: 0;
        visibility: hidden;
        transform: translateY(6px);
    }
}

.site-header .nav-dropdown-menu .nav-link {
    display: block;
    padding: 0.55rem 1rem;
}

.site-header .nav-dropdown-menu .nav-link::after {
    display: none;
}

.site-header .nav-dropdown-menu .nav-link.active-child {
    color: var(--primary);
    background: rgba(37, 99, 235, 0.06);
}

.site-header .nav-dropdown-menu--study {
    min-width: 300px;
    max-height: 70vh;
    overflow-y: auto;
}

.site-header .nav-dropdown-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    padding: 0.55rem 1rem;
    margin: 0.35rem 0.5rem 0.15rem;
    border-radius: 6px;
    list-style: none;
}

.site-header .nav-dropdown-menu--study .nav-link {
    font-size: 0.88rem;
    padding: 0.45rem 1rem;
}

.site-header .nav-dropdown-child .nav-link {
    padding-left: 2rem;
    font-size: 0.86rem;
    color: var(--dark);
}

.site-header .nav-dropdown-child .nav-link:hover {
    color: var(--primary);
    background: rgba(37, 99, 235, 0.05);
}

/* Mega menu — Study Material */
.site-header .nav-dropdown--mega {
    position: relative;
}

.site-header .nav-mega-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    min-width: 340px;
    max-width: 420px;
    background: white;
    border: 1px solid var(--gray-light);
    border-radius: 12px;
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(6px);
    transition: all 0.2s ease;
    z-index: 1001;
    padding: 0;
    list-style: none;
}

.site-header .nav-dropdown--mega:hover .nav-mega-menu,
.site-header .nav-dropdown--mega.open .nav-mega-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

@media (min-width: 769px) {
    .site-header .nav-dropdown--mega.open:not(:hover) .nav-mega-menu {
        opacity: 0;
        visibility: hidden;
        transform: translateY(6px);
    }
}

.site-header .nav-mega-tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--gray-light);
    padding: 0.35rem 0.5rem 0;
    background: var(--light);
    border-radius: 12px 12px 0 0;
}

.site-header .nav-mega-tab {
    flex: 1;
    border: none;
    background: transparent;
    font-family: 'Inter', sans-serif;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--gray);
    padding: 0.5rem 0.4rem;
    cursor: pointer;
    border-radius: 6px 6px 0 0;
    transition: var(--transition);
}

.site-header .nav-mega-tab:hover {
    color: var(--primary);
}

.site-header .nav-mega-tab.active {
    color: var(--primary);
    background: white;
    box-shadow: 0 -2px 0 var(--primary) inset;
}

.site-header .nav-mega-panels {
    padding: 0.65rem 0.75rem 0.5rem;
}

.site-header .nav-mega-panel[hidden] {
    display: none;
}

.site-header .nav-mega-hub {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.55rem 0.65rem;
    margin-bottom: 0.35rem;
    border-radius: 8px;
    text-decoration: none;
    color: var(--dark);
    font-weight: 600;
    font-size: 0.9rem;
    background: rgba(37, 99, 235, 0.06);
    transition: var(--transition);
}

.site-header .nav-mega-hub:hover {
    background: rgba(37, 99, 235, 0.12);
    color: var(--primary);
}

.site-header .nav-mega-hub span {
    font-weight: 500;
    font-size: 0.75rem;
    color: var(--gray);
    margin-left: auto;
}

.site-header .nav-mega-hub i {
    color: var(--primary);
    width: 1.1rem;
    text-align: center;
}

.site-header .nav-mega-label {
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--gray);
    padding: 0.45rem 0.25rem 0.2rem;
}

.site-header .nav-mega-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.15rem 0.5rem;
    padding-bottom: 0.35rem;
}

.site-header .nav-mega-grid .nav-link {
    font-size: 0.84rem;
    padding: 0.35rem 0.5rem;
    border-radius: 6px;
}

.site-header .nav-mega-grid .nav-link:hover {
    background: rgba(37, 99, 235, 0.06);
}

.site-header .nav-mega-footer {
    display: block;
    padding: 0.65rem 1rem;
    border-top: 1px solid var(--gray-light);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    text-decoration: none;
    border-radius: 0 0 12px 12px;
    background: var(--light);
}

.site-header .nav-mega-footer:hover {
    background: rgba(37, 99, 235, 0.08);
}

.site-header .nav-dropdown-divider {
    height: 1px;
    background: var(--gray-light);
    margin: 0.35rem 0.75rem;
    list-style: none;
}

.site-header .nav-mega-hub.active-child,
.site-header .nav-mega-grid .nav-link.active-child {
    color: var(--primary);
    background: rgba(37, 99, 235, 0.1);
}

.site-header .nav-dropdown-menu--cheats {
    min-width: 260px;
    max-height: 70vh;
    overflow-y: auto;
}

.site-header .nav-dropdown-toggle.active-parent {
    color: var(--primary);
}

/* Page offset for fixed header */
body.has-site-nav {
    padding-top: 70px;
}

@media (max-width: 768px) {
    .appearance-wrap {
        margin-left: auto;
        order: 2;
        z-index: 1001;
    }

    .site-header .mobile-menu-btn {
        display: block;
        order: 3;
    }

    .site-header .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--surface);
        flex-direction: column;
        align-items: stretch;
        padding: 1rem 0;
        box-shadow: var(--shadow);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
        gap: 0;
    }

    .site-header .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .site-header .nav-menu > li {
        width: 100%;
    }

    .site-header .nav-link,
    .site-header .nav-dropdown-toggle {
        display: block;
        padding: 0.85rem 2rem;
        width: 100%;
        text-align: left;
    }

    .site-header .tutorials-link {
        margin: 0.5rem 2rem;
        text-align: center;
        display: block;
    }

    .site-header .nav-dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        background: var(--light);
        border-radius: 0;
        max-height: 0;
        overflow: hidden;
        padding: 0;
        transition: max-height 0.3s ease;
    }

    .site-header .nav-dropdown.open .nav-dropdown-menu,
    .site-header .nav-dropdown.open .nav-mega-menu {
        max-height: 80vh;
        overflow-y: auto;
        padding: 0;
    }

    .site-header .nav-mega-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        max-height: 0;
        overflow: hidden;
        min-width: 100%;
    }

    .site-header .nav-dropdown.open .nav-mega-menu {
        max-height: 80vh;
    }

    .site-header .nav-dropdown:hover .nav-dropdown-menu {
        transform: none;
    }

    .site-header .nav-dropdown-menu .nav-link {
        padding: 0.65rem 2.5rem;
        font-size: 0.9rem;
    }
}

html[data-theme="dark"] .tools-card,
html[data-theme="midnight"] .tools-card,
html[data-theme="ocean"] .tools-card,
html[data-theme="forest"] .tools-card,
html[data-theme="sepia"] .tools-card {
    background: var(--surface);
    border-color: var(--border);
    color: var(--page-fg);
}

html[data-theme] .cs-note,
html[data-theme] .cs-card {
    background: var(--surface);
    border-color: var(--border);
    color: var(--page-fg);
}