/* Navigation Styles */
header {
    /* Product UI: calmer border-first glass */
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: none;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition:
        transform 0.28s var(--ease-smooth),
        opacity 0.28s var(--ease-smooth),
        background-color 0.25s var(--ease-smooth),
        border-color 0.25s var(--ease-smooth),
        box-shadow 0.25s var(--ease-smooth);
}

header.scrolled {
    background: rgba(255, 255, 255, 0.92);
    box-shadow: var(--shadow-sm);
}

/* Auto-hide header on scroll (desktop/tablet).
   On mobile we keep a compact "menu button only" state instead (see media query below). */
header.nav-hidden {
    transform: translate3d(0, -120%, 0);
    opacity: 0;
}

@media screen and (max-width: 768px) {
    header.nav-hidden {
        /* Keep the menu button accessible on mobile */
        transform: none;
        opacity: 1;
        background: transparent;
        border-color: transparent;
        box-shadow: none;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }

    header.nav-hidden nav {
        padding: 12px 0;
    }

    header.nav-hidden .logo,
    header.nav-hidden .logo-group {
        opacity: 0;
        transform: translateY(-6px);
        pointer-events: none;
    }

    /* Slightly stronger button surface so it remains legible over content */
    header.nav-hidden .mobile-menu-button {
        background: rgba(255, 255, 255, 0.78);
        border-color: rgba(0, 0, 0, 0.06);
        box-shadow: 0 8px 26px rgba(0, 0, 0, 0.08);
    }
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 0;
    transition: padding 0.25s var(--ease-smooth);
}

header.scrolled nav {
    padding: 10px 0;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
    display: flex;
    align-items: center;
    transition: var(--transition);
    font-family: 'Satoshi', system-ui, -apple-system, sans-serif;
}

.logo:hover {
    transform: none;
}

.logo img, .logo-img {
    height: 36px;
    width: auto; /* prevent distortion from HTML width attribute */
    transition: var(--transition);
}

header.scrolled .logo img,
header.scrolled .logo-img {
    height: 34px;
}

.logo:hover img, .logo:hover .logo-img {
    transform: none;
}

/* Header Navigation Links */
.header-nav {
    display: flex;
    align-items: center;
    gap: 14px;
}

.header-nav-links {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Desktop dropdowns (modern product popover) */
.nav-dropdown {
    position: relative;
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
}

.nav-dropdown-trigger {
    /* Wrapper for link + caret */
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    border: 1px solid transparent;
    background: transparent;
    transition: var(--transition);
}

.nav-dropdown-link {
    display: inline-flex;
    align-items: center;
    padding: 8px 8px 8px 10px;
    border-radius: 999px;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 650;
    line-height: 1;
    transition: var(--transition);
}

.nav-dropdown-caret {
    width: 28px;
    height: 28px;
    padding: 0;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

.nav-dropdown:hover .nav-dropdown-trigger,
.nav-dropdown.open .nav-dropdown-trigger {
    background: rgba(4, 120, 87, 0.06);
    border-color: rgba(4, 120, 87, 0.14);
}

.nav-dropdown-link.active,
.nav-dropdown.open .nav-dropdown-link {
    color: var(--text);
}

.nav-dropdown.is-active .nav-dropdown-trigger {
    background: rgba(4, 120, 87, 0.10);
    border-color: rgba(4, 120, 87, 0.16);
}

.nav-dropdown-caret i {
    font-size: 10px;
    opacity: 0.65;
    transition: transform 0.18s var(--ease-smooth);
}

.nav-dropdown.open .nav-dropdown-caret i {
    transform: rotate(180deg);
}

.nav-dropdown-menu {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    transform: translateY(-2px) scale(0.98);
    transform-origin: top left;
    min-width: 280px;
    max-width: min(340px, 92vw);

    /* Higher opacity for readability on image backgrounds */
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 16px;
    box-shadow: 0 28px 70px rgba(0, 0, 0, 0.16);

    padding: 8px;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    z-index: 1200;

    transition:
        opacity 0.18s var(--ease-smooth),
        transform 0.18s var(--ease-smooth),
        visibility 0.18s;
}

.nav-dropdown.open .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0) scale(1);
}

/* Right-aligned dropdown for items near viewport edge */
.nav-dropdown[data-align="right"] .nav-dropdown-menu {
    left: auto;
    right: 0;
    transform-origin: top right;
}

@media (hover: hover) and (pointer: fine) {
    /* Invisible hover bridge so it doesn't collapse while crossing to the menu */
    .nav-dropdown::after {
        content: '';
        position: absolute;
        left: 0;
        right: 0;
        top: 100%;
        height: 10px;
    }

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

.nav-dropdown-item {
    display: block;
    padding: 10px 12px;
    border-radius: 12px;
    text-decoration: none;
    border: 1px solid transparent;
    transition: var(--transition);
}

.nav-dropdown-title {
    display: block;
    color: var(--text);
    font-weight: 750;
    font-size: 13px;
    line-height: 1.2;
}

.nav-dropdown-desc {
    display: block;
    margin-top: 2px;
    color: var(--text-secondary);
    font-size: 12px;
    line-height: 1.35;
}

.nav-dropdown-item:hover {
    background: rgba(4, 120, 87, 0.06);
    border-color: rgba(4, 120, 87, 0.16);
}

.nav-dropdown-item:focus-visible {
    outline: 2px solid rgba(4, 120, 87, 0.35);
    outline-offset: 3px;
}

.header-nav-links > a {
    font-size: 13px;
    font-weight: 650;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    padding: 8px 10px;
    border-radius: 999px;
    border: 1px solid transparent; /* match dropdown pill height/weight */
    line-height: 1;
}

.header-nav-links > a:hover {
    color: var(--text);
    background: rgba(4, 120, 87, 0.06);
    border-color: rgba(4, 120, 87, 0.14);
}

.header-nav-links > a.active {
    color: var(--text);
    background: rgba(4, 120, 87, 0.10);
    border-color: rgba(4, 120, 87, 0.16);
}

.header-nav-links > a::after {
    /* Product UI: avoid animated underlines in top nav */
    content: none;
}

/* Keyboard focus: consistent product-style ring */
.header-nav-links > a:focus-visible,
.nav-dropdown-link:focus-visible,
.nav-dropdown-caret:focus-visible,
.language-toggle:focus-visible,
.mobile-menu-button:focus-visible,
.menu-close:focus-visible {
    outline: 2px solid rgba(4, 120, 87, 0.35);
    outline-offset: 3px;
}

/* Compact CTA in header */
.header-nav-links > a.nav-cta {
    color: var(--text);
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.60);
}

.header-nav-links > a.nav-cta:hover {
    color: var(--accent);
    border-color: rgba(4, 120, 87, 0.35);
    background: rgba(4, 120, 87, 0.08);
}

/* Responsive header nav - wrap on smaller screens */
@media screen and (max-width: 900px) {
    .header-nav-links {
        gap: 16px;
    }
    
    .header-nav-links > a {
        font-size: 13px;
    }
}

@media screen and (max-width: 700px) {
    .header-nav {
        gap: 16px;
    }
    
    .header-nav-links {
        gap: 12px;
    }
    
    .header-nav-links > a {
        font-size: 12px;
    }
}

@media screen and (max-width: 550px) {
    .header-nav-links {
        gap: 8px;
    }
    
    .header-nav-links > a {
        font-size: 11px;
    }

    .language-toggle {
        height: 36px;
        padding: 6px 8px;
        gap: 6px;
    }

    .language-label {
        font-size: 11px;
        letter-spacing: 0.06em;
    }
}

/* Logo Group with Tagline */
.logo-group {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-tagline {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-secondary);
    padding-left: 16px;
    border-left: 2px solid var(--accent);
    white-space: nowrap;
    line-height: 1.2;
    display: inline-block;
}

@media screen and (max-width: 600px) {
    .header-tagline {
        display: none;
    }
}

/* Language Dropdown */
.language-dropdown {
    position: relative;
}

.language-toggle {
    /* Product UI: pill toggle that shows current state (EN/JA) */
    background: transparent;
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 16px;
    padding: 8px 10px;
    border-radius: 999px;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: auto;
    height: 40px;
}

.language-toggle:hover {
    color: var(--text);
    background: rgba(4, 120, 87, 0.06);
    border-color: rgba(4, 120, 87, 0.20);
}

.language-dropdown.open .language-toggle {
    color: var(--text);
    background: rgba(4, 120, 87, 0.06);
    border-color: rgba(4, 120, 87, 0.20);
}

.language-label {
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.08em;
}

.language-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition:
        opacity 0.2s ease,
        transform 0.2s ease;
    min-width: 120px;
    overflow: hidden;
    z-index: 1001;
}

.language-dropdown.open .language-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.language-menu button {
    display: block;
    width: 100%;
    padding: 12px 16px;
    background: none;
    border: none;
    text-align: left;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    cursor: pointer;
    transition: var(--transition);
    font-family: 'Satoshi', system-ui, -apple-system, sans-serif;
}

.language-menu button:hover {
    background: var(--surface-hover, rgba(0, 0, 0, 0.04));
    color: var(--accent);
}

.language-menu button.active {
    color: var(--accent);
    background: rgba(23, 124, 87, 0.06);
}

.language-menu button:first-child {
    border-radius: 12px 12px 0 0;
}

.language-menu button:last-child {
    border-radius: 0 0 12px 12px;
}

/* Menu Button - Legacy (hidden) */
.menu-button {
    display: none;
}

/* ========================================
   SLEEK MOBILE MENU - Full Screen Overlay
   ======================================== */

/* Animated Hamburger Button */
.mobile-menu-button {
    display: none;
    width: 44px;
    height: 44px;
    background: rgba(255, 255, 255, 0.55);
    border: 1px solid var(--border-subtle);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    cursor: pointer;
    position: relative;
    z-index: 2001;
    padding: 0;
    border-radius: 12px;
    transition: var(--transition);
}

.mobile-menu-button:hover {
    background: rgba(4, 120, 87, 0.06);
    border-color: rgba(4, 120, 87, 0.20);
}

.mobile-menu-button.active {
    background: rgba(4, 120, 87, 0.08);
    border-color: rgba(4, 120, 87, 0.20);
}

/* Floating menu button (desktop when header is hidden) */
.floating-menu-button {
    position: fixed;
    top: calc(14px + env(safe-area-inset-top));
    right: calc(18px + env(safe-area-inset-right));
    width: 44px;
    height: 44px;
    background: rgba(255, 255, 255, 0.72);
    border: 1px solid var(--border-subtle);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    cursor: pointer;
    z-index: 2002;
    padding: 0;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px) scale(0.98);
    box-shadow: none;
    transition:
        opacity 0.22s var(--ease-smooth),
        transform 0.22s var(--ease-smooth),
        background-color 0.22s var(--ease-smooth),
        border-color 0.22s var(--ease-smooth),
        box-shadow 0.22s var(--ease-smooth),
        visibility 0.22s;
}

.floating-menu-button.visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0) scale(1);
    box-shadow: 0 8px 26px rgba(0, 0, 0, 0.08);
}

.floating-menu-button:hover {
    background: rgba(4, 120, 87, 0.06);
    border-color: rgba(4, 120, 87, 0.20);
}

.floating-menu-button.active {
    background: rgba(4, 120, 87, 0.08);
    border-color: rgba(4, 120, 87, 0.20);
}

@media screen and (max-width: 768px) {
    .floating-menu-button {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .floating-menu-button {
        transition: none;
    }
}

.hamburger-bars {
    width: 22px;
    height: 2px;
    background: var(--text);
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    transition: background 0.2s ease 0.1s;
    border-radius: 2px;
}

.hamburger-bars::before,
.hamburger-bars::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background: var(--text);
    left: 0;
    border-radius: 2px;
    transition: transform 0.35s cubic-bezier(0.68, -0.35, 0.27, 1.35),
                width 0.2s ease;
}

.hamburger-bars::before {
    transform: translateY(-7px);
    width: 16px;
}

.hamburger-bars::after {
    transform: translateY(7px);
}

/* Hamburger to X transformation */
.mobile-menu-button.active .hamburger-bars,
.floating-menu-button.active .hamburger-bars {
    background: transparent;
    transition: background 0.1s ease;
}

.mobile-menu-button.active .hamburger-bars::before,
.mobile-menu-button.active .hamburger-bars::after,
.floating-menu-button.active .hamburger-bars::before,
.floating-menu-button.active .hamburger-bars::after {
    width: 22px;
    background: var(--text);
}

.mobile-menu-button.active .hamburger-bars::before,
.floating-menu-button.active .hamburger-bars::before {
    transform: rotate(45deg);
}

.mobile-menu-button.active .hamburger-bars::after,
.floating-menu-button.active .hamburger-bars::after {
    transform: rotate(-45deg);
}

/* ========================================
   FROSTED GLASS SIDE PANEL
   ======================================== */

/* Overlay - subtle dark backdrop */
.menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.24);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.35s ease, visibility 0.35s ease;
    z-index: 1999;
}

.menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Menu Pane - Frosted Glass Side Panel */
.menu-pane {
    position: fixed;
    top: 0;
    right: 0;
    width: 360px;
    max-width: 85vw;
    height: 100vh;
    height: 100dvh;
    background: rgba(255, 255, 255, 0.86);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    flex-direction: column;
    z-index: 2000;
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: -24px 0 70px rgba(0, 0, 0, 0.14);
    border-left: 1px solid var(--border-subtle);
    padding: calc(18px + env(safe-area-inset-top) + 56px) 24px calc(20px + env(safe-area-inset-bottom) + 12px);
}

.menu-pane.active {
    transform: translateX(0);
}

/* Subtle top accent line */
.menu-pane::before {
    display: none;
}

/* Hide decorative elements for this minimal style */
.menu-decoration {
    display: none;
}

/* Close button - minimal style */
.menu-close {
    position: absolute;
    top: 28px;
    right: 28px;
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    border-radius: 12px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition:
        color 0.2s var(--ease-smooth),
        background-color 0.2s var(--ease-smooth),
        border-color 0.2s var(--ease-smooth);
    border: 1px solid var(--border-subtle);
    background: rgba(255, 255, 255, 0.55);
}

.menu-close:hover {
    color: var(--text);
    border-color: rgba(4, 120, 87, 0.20);
    background: rgba(4, 120, 87, 0.06);
}

/* Navigation links container */
.menu-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
    justify-content: flex-start;
    align-items: center; /* keep main menu items centered */
    padding: 0; /* override global nav padding */
    min-height: 0; /* allow flex child to scroll */
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
}

/* Full-width rows for expandable sections (keeps chevrons aligned) */
.menu-nav > .menu-nav-section {
    width: 100%;
    align-self: stretch;
}

/* Individual nav links - clean slide-in */
.menu-nav > a,
.menu-nav .menu-nav-trigger {
    color: var(--text);
    font-size: 28px;
    font-weight: 700;
    font-family: 'Satoshi', system-ui, -apple-system, sans-serif;
    letter-spacing: -0.01em;
    position: relative;
    transition:
        opacity 0.3s ease,
        transform 0.3s ease,
        color 0.3s ease;
    opacity: 0;
    transform: translateX(30px);
}

.menu-nav > a {
    display: block;
    padding: 14px 0;
    text-decoration: none;
}

/* Parent link + expand button (mobile dropdown sections) */
.menu-nav .menu-nav-trigger {
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
}

/* Balance the right-side toggle so the label stays truly centered */
.menu-nav .menu-nav-trigger::before {
    content: '';
    display: block;
    width: 44px;   /* match .menu-nav-toggle */
    height: 44px;  /* match .menu-nav-toggle */
    flex: 0 0 44px;
    pointer-events: none;
}

.menu-nav .menu-nav-link {
    flex: 0 0 auto;
    display: block;
    padding: 14px 0;
    color: inherit;
    text-decoration: none;
    text-align: center;
    position: relative;
}

.menu-nav .menu-nav-toggle {
    width: 44px;
    height: 44px;
    padding: 0;
    border: none;
    background: transparent;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease, transform 0.2s ease;
}

.menu-nav .menu-nav-toggle:hover {
    background: rgba(23, 124, 87, 0.08);
}

.menu-nav .menu-nav-toggle:active {
    transform: scale(0.98);
}

.menu-nav .menu-nav-toggle:focus-visible {
    outline: 2px solid rgba(23, 124, 87, 0.35);
    outline-offset: 3px;
}

.menu-pane.active .menu-nav > a,
.menu-pane.active .menu-nav .menu-nav-trigger {
    opacity: 1;
    transform: translateX(0);
}

/* Staggered reveal delays */
.menu-pane.active .menu-nav > a:nth-child(1) { transition-delay: 0.08s; }
.menu-pane.active .menu-nav > .menu-nav-section:nth-child(2) > .menu-nav-trigger { transition-delay: 0.13s; }
.menu-pane.active .menu-nav > .menu-nav-section:nth-child(3) > .menu-nav-trigger { transition-delay: 0.18s; }
.menu-pane.active .menu-nav > a:nth-child(4) { transition-delay: 0.23s; }
.menu-pane.active .menu-nav > a:nth-child(5) { transition-delay: 0.28s; }

/* Hover: green color + slight shift */
.menu-nav > a:hover,
.menu-nav .menu-nav-trigger:hover {
    color: var(--accent);
    transform: none;
}

/* Product UI: no animated underlines in the mobile menu */
.menu-nav > a::after,
.menu-nav .menu-nav-link::after {
    content: none;
}

/* Active page indicator */
.menu-nav > a.active,
.menu-nav .menu-nav-link.active {
    color: var(--accent);
}

/* Menu footer */
.menu-footer {
    padding-top: 32px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateY(10px);
    transition:
        opacity 0.4s ease,
        transform 0.4s ease;
}

.menu-pane.active .menu-footer {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0.35s;
}

/* Menu footer language dropdown */
.menu-footer .language-dropdown {
    position: relative;
}

.menu-footer .language-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: 8px;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition:
        border-color 0.25s ease,
        background-color 0.25s ease,
        color 0.25s ease;
    width: auto;
    height: auto;
}

.menu-footer .language-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(23, 124, 87, 0.04);
}

.menu-footer .language-toggle i {
    font-size: 14px;
}

.menu-footer .language-label {
    font-size: 14px;
    font-weight: 650;
    letter-spacing: 0.02em;
}

.menu-footer .language-menu {
    bottom: calc(100% + 8px);
    top: auto;
    left: 0;
    transform: translateY(8px);
    min-width: 130px;
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.menu-footer .language-dropdown.open .language-menu {
    transform: translateY(0);
}

.menu-footer .language-menu button {
    color: var(--text);
    font-weight: 500;
}

.menu-footer .language-menu button:hover {
    background: rgba(23, 124, 87, 0.06);
    color: var(--accent);
}

.menu-footer .language-menu button.active {
    color: var(--accent);
    background: rgba(23, 124, 87, 0.06);
}

/* Hide old navigation links */
.nav-links {
    display: none;
}

/* Mobile Navigation Breakpoint */
@media screen and (max-width: 768px) {
    .header-nav-links {
        display: none !important;
    }

    /* Mobile: language is available in the menu footer, so hide the header toggle */
    header .header-nav > .language-dropdown {
        display: none;
    }
    
    .mobile-menu-button {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .header-nav {
        gap: 8px;
    }
}

/* Responsive Design - Tablet */
@media screen and (max-width: 768px) {
    nav {
        padding: 16px 0;
    }
    
    .logo img, .logo-img {
        height: 36px;
    }
    
    .menu-pane {
        padding: calc(18px + env(safe-area-inset-top) + 52px) 22px calc(18px + env(safe-area-inset-bottom) + 12px);
    }
    
    .menu-nav > a,
    .menu-nav .menu-nav-trigger {
        font-size: 26px;
    }
    
    .menu-nav > a {
        padding: 12px 0;
    }

    .menu-nav .menu-nav-link {
        padding: 12px 0;
    }
    
    .menu-close {
        top: calc(14px + env(safe-area-inset-top));
        right: 16px;
    }
}

/* Responsive Design - Mobile */
@media screen and (max-width: 480px) {
    nav {
        padding: 14px 0;
    }
    
    .logo img, .logo-img {
        height: 32px;
    }
    
    .menu-pane {
        width: 100%;
        max-width: 100%;
        padding: calc(16px + env(safe-area-inset-top) + 50px) 18px calc(16px + env(safe-area-inset-bottom) + 12px);
    }
    
    .menu-nav > a,
    .menu-nav .menu-nav-trigger {
        font-size: 24px;
    }
    
    .menu-nav > a {
        padding: 11px 0;
    }

    .menu-nav .menu-nav-link {
        padding: 11px 0;
    }
    
    .menu-close {
        top: calc(12px + env(safe-area-inset-top));
        right: 12px;
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
    
    .menu-footer {
        padding-top: 24px;
    }
    
    .menu-footer .language-toggle {
        padding: 8px 14px;
        font-size: 13px;
    }
}

/* ========================================
   MOBILE EXPANDABLE MENU SECTIONS
   ======================================== */

/* Menu section with expandable sub-items */
.menu-nav-section {
    position: relative;
    width: 100%;
}

.menu-nav-section > .menu-nav-trigger {
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.menu-nav-trigger .expand-icon {
    font-size: 14px;
    transition: transform 0.3s ease;
    color: var(--text-secondary);
}

.menu-nav-section.expanded .menu-nav-trigger .expand-icon {
    transform: rotate(180deg);
}

/* Sub-menu cards container */
.menu-sub-cards {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    padding: 0 0 0 0;
    transform: translateY(-6px);
    visibility: hidden;
    pointer-events: none;
    transition: max-height 0.45s var(--ease-out-back), padding 0.35s ease, opacity 0.25s ease, transform 0.35s var(--ease-out-back);
}

.menu-nav-section.expanded .menu-sub-cards {
    opacity: 1;
    padding: 12px 0 8px 0;
    max-height: 340px;
    transform: translateY(0);
    visibility: visible;
    pointer-events: auto;
}

/* Mobile sub-menu cards */
.menu-sub-card {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 14px 44px 14px 16px; /* room for arrow affordance */
    background: rgba(23, 124, 87, 0.04);
    border: 1px solid var(--border);
    border-radius: 12px;
    text-decoration: none;
    transition: transform 0.35s var(--ease-out-back), opacity 0.3s ease, background 0.2s ease, border-color 0.2s ease;
    position: relative;
}

.menu-sub-card::after {
    content: '';
    position: absolute;
    right: 16px;
    top: 18px;
    width: 9px;
    height: 9px;
    border-right: 2px solid rgba(4, 120, 87, 0.5);
    border-top: 2px solid rgba(4, 120, 87, 0.5);
    transform: rotate(45deg);
    opacity: 0.75;
    transition: transform 0.2s ease, opacity 0.2s ease, border-color 0.2s ease;
}

.menu-sub-card:hover::after {
    transform: translateX(2px) rotate(45deg);
    opacity: 1;
    border-color: var(--accent);
}

/* Sub-card slide-in when section expands (more engaging on mobile) */
.menu-pane.active .menu-sub-cards .menu-sub-card {
    opacity: 0;
    transform: translateX(10px);
}

.menu-pane.active .menu-nav-section.expanded .menu-sub-cards .menu-sub-card {
    opacity: 1;
    transform: translateX(0);
}

.menu-sub-card:hover {
    background: rgba(23, 124, 87, 0.08);
    border-color: var(--accent);
    transform: translateX(4px);
}

.menu-sub-card .sub-card-title {
    display: block;
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    transition: color 0.2s ease;
}

.menu-sub-card:hover .sub-card-title {
    color: var(--accent);
}

.menu-sub-card .sub-card-desc {
    display: block;
    font-size: 13px;
    font-weight: 400;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* Stagger animation for mobile sub-cards */
.menu-nav-section.expanded .menu-sub-card:nth-child(1) {
    transition-delay: 0.05s;
}
.menu-nav-section.expanded .menu-sub-card:nth-child(2) {
    transition-delay: 0.1s;
}

@media (hover: none) {
    .menu-sub-card:active {
        transform: translateX(6px) scale(0.99);
    }
}