/* ==========================================================================
   Header & Footer Styles - Wei Gang Photography
   ========================================================================== */

/* CSS Custom Properties (Variables)
   ========================================================================== */
:root {
    /* Colors */
    --color-primary: #146EF5;
    --color-primary-dark: #0A3D8F;
    --color-primary-light: #E6F0FF;
    --color-black: #000000;
    --color-dark-gray: #1A1A1A;
    --color-medium-gray: #666666;
    --color-light-gray: #F5F5F5;
    --color-white: #FFFFFF;

    /* Typography */
    --font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', Oxygen, Ubuntu, Cantarell, sans-serif;

    /* Spacing */
    --container-max-width: 1200px;
    --header-height-desktop: 80px;
    --header-height-mobile: 64px;

    /* Transitions */
    --transition-base: 0.3s ease;
    --transition-fast: 0.2s ease;
}

/* Accessibility helpers */
.skip-link {
    position: absolute;
    left: -999px;
    top: -999px;
    z-index: 1000;
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: 12px 16px;
    border-radius: 4px;
    font-weight: 600;
    text-decoration: none;
    transform: translateY(-10px);
    transition: transform var(--transition-fast);
}

.skip-link:focus {
    left: 16px;
    top: 16px;
    transform: translateY(0);
}

/* ==========================================================================
   HEADER STYLES
   ========================================================================== */

/* Header Container */
.site-header {
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    background: var(--color-white);
    z-index: 1000;
    transition: box-shadow var(--transition-base);
}

.site-header.scrolled {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.header-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height-desktop);
    gap: 32px;
}

/* Logo / Site Branding */
.site-branding {
    flex-shrink: 0;
}

.site-branding .custom-logo-link {
    display: block;
    line-height: 0;
}

.site-branding .custom-logo {
    max-height: 50px;
    width: auto;
    height: auto;
}

.site-logo-text {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: var(--color-black);
    line-height: 1.2;
}

.logo-name {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-black);
}

.logo-tagline {
    font-size: 12px;
    font-weight: 400;
    color: var(--color-medium-gray);
}

/* Main Navigation */
.main-navigation {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-menu > li {
    position: relative;
}

.nav-menu > li > a {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 16px;
    font-weight: 500;
    color: var(--color-black);
    text-decoration: none;
    transition: color var(--transition-fast);
    padding: 8px 0;
}

.nav-menu > li > a:hover,
.nav-menu > li > a:focus {
    color: var(--color-primary);
    outline: none;
}

/* Dropdown Indicator */
.nav-menu .menu-item-has-children > a::after {
    content: '';
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 4px solid currentColor;
    margin-left: 4px;
    transition: transform var(--transition-fast);
}

.nav-menu .menu-item-has-children:hover > a::after {
    transform: rotate(180deg);
}

/* Dropdown Menu */
.nav-menu .sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: var(--color-white);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    border-radius: 8px;
    padding: 8px 0;
    margin: 8px 0 0 0;
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
}

.nav-menu .menu-item-has-children:hover > .sub-menu,
.nav-menu .menu-item-has-children.active > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-menu .sub-menu li {
    margin: 0;
}

.nav-menu .sub-menu a {
    display: block;
    padding: 12px 24px;
    font-size: 15px;
    font-weight: 400;
    color: var(--color-black);
    text-decoration: none;
    transition: background-color var(--transition-fast);
}

.nav-menu .sub-menu a:hover,
.nav-menu .sub-menu a:focus {
    background-color: var(--color-light-gray);
    outline: none;
}

/* Header CTA Button */
.header-cta {
    flex-shrink: 0;
}

.btn {
    display: inline-block;
    font-family: var(--font-family);
    font-size: 16px;
    font-weight: 500;
    text-align: center;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    border-radius: 8px;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
    padding: 12px 28px;
}

.btn-primary:hover,
.btn-primary:focus {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(20, 110, 245, 0.3);
    outline: none;
}

.btn-full {
    width: 100%;
}

/* Language Switcher */
.header-lang {
    flex-shrink: 0;
    margin-left: auto;
    margin-right: 16px;
}

.language-switcher {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    line-height: 1;
}

.current-lang {
    color: var(--color-primary);
    font-weight: 600;
}

.lang-separator {
    color: var(--color-medium-gray);
    opacity: 0.4;
}

.other-lang {
    color: var(--color-medium-gray);
    text-decoration: none;
    transition: color var(--transition-fast);
    font-weight: 400;
}

.other-lang:hover,
.other-lang:focus {
    color: var(--color-primary);
    outline: none;
}

/* Flag style variant (if using flags instead of text) */
.language-switcher.flag-style {
    gap: 12px;
}

.flag-icon {
    font-size: 20px;
    line-height: 1;
}

.current-flag {
    opacity: 1;
}

.other-flag {
    opacity: 0.5;
    transition: opacity var(--transition-fast);
}

.other-flag:hover,
.other-flag:focus {
    opacity: 1;
    outline: none;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    margin: 0;
    z-index: 1001;
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background: var(--color-black);
    transition: all var(--transition-fast);
    border-radius: 2px;
}

.mobile-menu-toggle:hover .hamburger-line {
    background: var(--color-primary);
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-width: 400px;
    background: var(--color-white);
    z-index: 1002;
    transform: translateX(100%);
    transition: transform var(--transition-base);
    display: flex;
    flex-direction: column;
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.1);
}

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

.mobile-menu-header {
    display: flex;
    justify-content: flex-end;
    padding: 12px 16px;
    border-bottom: none;
}

.mobile-menu-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    color: var(--color-black);
    transition: color var(--transition-fast);
}

.mobile-menu-close:hover {
    color: var(--color-primary);
}

.mobile-navigation {
    flex: 1;
    overflow-y: auto;
    padding: 8px 16px;
}

.mobile-nav-menu {
    list-style: none;
    margin: 0;
    padding: 0;
}

.mobile-nav-menu li {
    margin: 0;
    border-bottom: 1px solid var(--color-light-gray);
}

.mobile-nav-menu li:last-child {
    border-bottom: none;
}

.mobile-nav-menu a {
    display: block;
    padding: 10px 0;
    font-size: 16px;
    font-weight: 500;
    color: var(--color-black);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.mobile-menu-footer {
    padding: 12px 16px;
    border-top: 1px solid var(--color-light-gray);
}

.mobile-lang-switcher {
    margin-bottom: 8px;
    display: flex;
    justify-content: center;
}

.mobile-lang-switcher .language-switcher {
    font-size: 16px;
}

/* Body lock when mobile menu is open */
body.mobile-menu-open {
    overflow: hidden;
}

/* ==========================================================================
   FOOTER STYLES
   ========================================================================== */

/* Footer Container */
.site-footer {
    background: var(--color-dark-gray);
    color: rgba(255, 255, 255, 0.9);
    padding: 64px 0 0;
}

.footer-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Footer Main Grid */
.footer-main {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

/* Footer Headings */
.footer-heading {
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-white);
    margin: 0 0 20px 0;
}

/* Footer Brand Column */
.footer-brand .footer-logo {
    margin-bottom: 16px;
}

.footer-brand .custom-logo {
    max-height: 40px;
    width: auto;
}

.footer-logo-text {
    display: flex;
    flex-direction: column;
    margin-bottom: 16px;
}

.footer-logo-text .logo-name {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-white);
}

.footer-logo-text .logo-tagline {
    font-size: 12px;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.7);
}

.footer-tagline {
    font-size: 14px;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.7);
    margin: 0 0 24px 0;
}

/* Social Icons */
.footer-social {
    display: flex;
    gap: 16px;
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--color-white);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.social-icon:hover,
.social-icon:focus {
    background: var(--color-primary);
    transform: scale(1.1);
    outline: none;
}

/* Footer Menus */
.footer-menu {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-menu li {
    margin: 0 0 12px 0;
}

.footer-menu li:last-child {
    margin-bottom: 0;
}

.footer-menu a {
    font-size: 15px;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-menu a:hover,
.footer-menu a:focus {
    color: var(--color-primary);
    outline: none;
}

.footer-link-arrow {
    font-weight: 500;
}

/* Footer Contact List */
.footer-contact-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 15px;
}

.contact-item:last-child {
    margin-bottom: 0;
}

.contact-icon {
    flex-shrink: 0;
    margin-top: 2px;
    color: var(--color-primary);
}

.contact-item a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.contact-item a:hover,
.contact-item a:focus {
    color: var(--color-primary);
    outline: none;
}

/* Footer Bottom Bar */
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 24px 0;
}

.footer-bottom-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-copyright p {
    margin: 0;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
}

.footer-legal {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
}

.footer-legal a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-legal a:hover,
.footer-legal a:focus {
    color: var(--color-white);
    outline: none;
}

.footer-legal .separator {
    color: rgba(255, 255, 255, 0.5);
}

/* Footer Light Style */
.footer-light {
    background: var(--color-light-gray);
    color: var(--color-black);
}

.footer-light .footer-heading {
    color: var(--color-black);
}

.footer-light .footer-logo-text .logo-name {
    color: var(--color-black);
}

.footer-light .footer-logo-text .logo-tagline,
.footer-light .footer-tagline {
    color: var(--color-medium-gray);
}

.footer-light .social-icon {
    background: rgba(0, 0, 0, 0.1);
    color: var(--color-black);
}

.footer-light .social-icon:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

.footer-light .footer-menu a {
    color: var(--color-black);
}

.footer-light .contact-item {
    color: var(--color-black);
}

.footer-light .contact-item a {
    color: var(--color-black);
}

.footer-light .footer-bottom {
    border-top-color: rgba(0, 0, 0, 0.1);
}

.footer-light .footer-copyright p,
.footer-light .footer-legal a {
    color: var(--color-medium-gray);
}

.footer-light .footer-legal a:hover {
    color: var(--color-black);
}

.footer-light .footer-legal .separator {
    color: rgba(0, 0, 0, 0.3);
}

/* ==========================================================================
   RESPONSIVE STYLES
   ========================================================================== */

/* Tablet (< 968px) */
@media (max-width: 968px) {
    /* Header */
    .main-navigation,
    .header-cta,
    .header-lang {
        display: none;
    }

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

    /* Footer */
    .footer-main {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
}

/* Mobile (< 640px) */
@media (max-width: 640px) {
    /* Header */
    .header-inner {
        height: var(--header-height-mobile);
    }

    .site-branding .custom-logo {
        max-height: 40px;
    }

    .logo-name {
        font-size: 20px;
    }

    .logo-tagline {
        font-size: 11px;
    }

    /* Mobile Menu Overlay */
    .mobile-menu-overlay {
        max-width: 100%;
    }

    /* Footer */
    .site-footer {
        padding: 48px 0 0;
    }

    .footer-main {
        grid-template-columns: 1fr;
        gap: 32px;
        margin-bottom: 32px;
        text-align: center;
    }

    .footer-brand {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .footer-social {
        justify-content: center;
    }

    .footer-bottom-inner {
        flex-direction: column;
        text-align: center;
        gap: 12px;
    }

    .footer-legal {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }
}

/* Small Mobile (< 480px) */
@media (max-width: 480px) {
    .header-container,
    .footer-container {
        padding: 0 16px;
    }

    .nav-menu {
        gap: 24px;
    }

    .footer-main {
        gap: 24px;
    }
}

/* Focus Visible for Accessibility */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .mobile-menu-toggle,
    .mobile-menu-overlay {
        display: none;
    }
}