/* ======================================================
   HEADER COMPONENT
   Sticky top navigation shown on every page.
====================================================== */
.site-header {
    background: var(--header-bg);
    color: var(--header-fg);
    padding: 1rem 0;
    min-height: var(--header-height);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-soft);
}

.header-container {
    max-width: var(--header-width);
    margin: 0 auto;
    padding: 0 var(--section-pad-x);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.header-content > * {
    min-width: 0;
}

.header-logo {
    flex-shrink: 0;
    position: relative;
    z-index: 1003;
}

.header-logo-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 1003;
    cursor: pointer;
    text-decoration: none;
    line-height: 0;
    color: var(--header-fg);
    min-width: 44px;
    min-height: 44px;
    padding: 0.35rem;
    margin: -0.35rem;
    pointer-events: auto;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transition: transform 0.3s ease, opacity 0.3s ease, color 0.3s ease;
}

.logo-img {
    height: 60px;
    width: auto;
    opacity: 0.95;
    display: block;
    pointer-events: none;
    transition: filter 0.3s ease, opacity 0.3s ease;
}

@media (hover: hover) and (pointer: fine) {
    .header-logo-link:hover {
        transform: scale(0.96);
        color: var(--color-secondary);
    }

    .header-logo-link:hover .logo-img {
        filter: brightness(0) saturate(100%) invert(70%) sepia(13%) saturate(658%) hue-rotate(12deg) brightness(95%) contrast(87%);
    }
}

.header-logo-link:active {
    transform: scale(0.94);
    color: var(--color-secondary);
}

.header-logo-link:active .logo-img,
.header-logo-link:focus .logo-img,
.header-logo-link:focus-visible .logo-img {
    filter: brightness(0) saturate(100%) invert(70%) sepia(13%) saturate(658%) hue-rotate(12deg) brightness(95%) contrast(87%);
}

.header-logo-link:focus,
.header-logo-link:focus-visible {
    color: var(--color-secondary);
    outline: none;
}

/* ======================================================
   MAIN NAVIGATION LINKS
   Primary shortcuts to key public pages.
====================================================== */
.main-nav {
    display: flex;
    gap: 2.8rem;
    align-items: center;
    margin-left: 2rem;
    flex: 1;
    min-width: 0;
}

.nav-link {
    font-family: 'Lora', serif;
    font-size: 1.14rem;
    font-weight: 600;
    color: var(--header-fg);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    transition: color 0.3s ease, opacity 0.3s ease;
    opacity: 0.9;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--color-secondary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.nav-link:hover {
    color: var(--color-secondary);
    opacity: 1;
}

.nav-link:hover::after {
    transform: scaleX(1);
}

/* Container keeps burger button and dropdown positioned together */
.menu-wrapper {
    position: relative;
    margin-left: auto;
}

/* ======================================================
   BURGER MENU BUTTON
   Mobile-friendly trigger that morphs into an "X" when active.
====================================================== */
.burger-menu {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    transition: all 0.3s ease;
    position: relative;
    z-index: 1002;
    margin-left: auto;
}

.burger-line {
    width: 30px;
    height: 3px;
    background-color: var(--header-fg);
    border-radius: 2px;
    transition: all 0.3s ease;
    display: block;
}

.burger-menu:not(.active) .burger-line {
    background-color: var(--header-fg);
}

.burger-menu.active .burger-line {
    background-color: var(--color-secondary);
}

.burger-menu.active .burger-line:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

.burger-menu.active .burger-line:nth-child(2) {
    opacity: 0;
}

.burger-menu.active .burger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Limit hover styling to pointer devices; avoids sticky hover color on iOS tap. */
@media (hover: hover) and (pointer: fine) {
    .burger-menu:hover {
        transform: scale(1.05);
    }

    .burger-menu:hover .burger-line {
        background-color: var(--color-secondary);
    }
}

/* ======================================================
   FULLSCREEN MENU OVERLAY
   Dark backdrop plus right-aligned chapter dropdown panel.
====================================================== */
.menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: transparent;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    pointer-events: none;
}

body.menu-open {
    overflow: hidden;
}

.menu-overlay.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    background-color: rgba(0, 0, 0, 0.3);
}

.menu-content {
    position: absolute;
    top: calc(var(--header-height) - 3px);
    right: 2rem;
    background: linear-gradient(135deg, var(--menu-bg-start) 0%, var(--menu-bg-end) 100%);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    box-shadow: var(--shadow-panel);
    width: 450px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                box-shadow 0.4s ease;
    border-top: 3px solid var(--menu-accent);
    z-index: 1000;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
}

.menu-overlay.active .menu-content {
    max-height: 650px;
    overflow-y: auto;
}

/* Improves readability when chapter list is longer than viewport */
.menu-content::-webkit-scrollbar {
    width: 8px;
}

.menu-content::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 0 0 12px 0;
}

.menu-content::-webkit-scrollbar-thumb {
    background: var(--color-secondary);
    border-radius: 4px;
}

.menu-content::-webkit-scrollbar-thumb:hover {
    background: var(--color-tertiary);
}

.close-menu {
    display: none;
}

.menu-title {
    font-family: 'Lora', serif;
    font-size: 1.25rem;
    color: #ffffff;
    margin: 0;
    padding: 1.5rem 2rem 1rem;
    text-align: left;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border-bottom: 1px solid var(--menu-divider);
    background: rgba(0, 0, 0, 0.1);
}

.menu-title:first-of-type {
    border-top: none;
}

.menu-title:not(:first-of-type) {
    margin-top: 0.5rem;
}

.chapter-list {
    list-style: none;
    padding: 1rem 0 1.5rem;
    margin: 0;
}

.chapter-list li {
    border-bottom: 1px solid var(--menu-divider-soft);
}

.chapter-list li:last-child {
    border-bottom: none;
}

.chapter-link {
    display: block;
    padding: 1rem 2rem;
    color: var(--header-fg);
    font-size: 0.9375rem;
    font-weight: 400;
    transition: all 0.3s ease;
    position: relative;
    padding-left: 3rem;
    line-height: 1.4;
}

.chapter-link::before {
    content: '\25B8';
    position: absolute;
    left: 1.5rem;
    color: var(--menu-accent);
    font-size: 1rem;
    transition: all 0.3s ease;
    opacity: 0.8;
}

.chapter-link:hover {
    background-color: rgba(197, 188, 160, 0.2);
    color: var(--color-secondary);
    padding-left: 3.5rem;
}

.chapter-link:hover::before {
    transform: translateX(5px);
    color: var(--color-tertiary);
    opacity: 1;
}

/* ------------------------------------------------------
   SPECIAL LINK STYLE
   Used for top-level "MAIN / PHOTO / MAPS" links inside menu.
------------------------------------------------------- */
.nav-main-link {
    font-weight: 500;
    background-color: rgba(197, 188, 160, 0.1);
}

.nav-main-link::before {
    content: '\2192';
    color: var(--color-tertiary);
    font-weight: bold;
}

.nav-main-link:hover {
    background-color: rgba(197, 188, 160, 0.25);
}

/* Disabled link state for chapters that are intentionally unavailable */
.chapter-link-disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

.chapter-link-disabled:hover {
    background-color: transparent;
    color: var(--header-fg);
    padding-left: 3rem;
}

.chapter-link-disabled::before {
    opacity: 0.3;
}

.chapter-link-disabled:hover::before {
    transform: none;
    color: var(--color-secondary);
}