/* ==========================================
   YECO 共享导航栏样式
   响应式设计 + 语言切换器集成 + RTL支持
   ========================================== */

/* ==========================================
   导航栏基础样式
   ========================================== */
.navigation {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(212, 175, 55, 0.1);
    z-index: var(--z-fixed, 1000);
    transition: all var(--transition-base, 0.3s ease);
}

.navigation.scrolled {
    padding: 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    background: rgba(0, 0, 0, 0.98);
}

/* 导航容器 - Flexbox布局支持RTL反转 */
.nav-container {
    max-width: var(--container-xl, 1280px);
    margin: 0 auto;
    padding: var(--spacing-md, 1rem) var(--spacing-xl, 2rem);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg, 1.5rem);
}

.navigation.scrolled .nav-container {
    padding: var(--spacing-sm, 0.75rem) var(--spacing-xl, 2rem);
}

/* ==========================================
   Logo
   ========================================== */
.nav-logo {
    font-family: var(--font-display, 'Playfair Display', serif);
    font-size: var(--text-2xl, 1.5rem);
    font-weight: 700;
    letter-spacing: 2px;
    background: linear-gradient(135deg, var(--accent-gold, #D4AF37), var(--soft-gold, #F4E4C1));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base, 0.3s ease);
    white-space: nowrap;
    flex-shrink: 0;
}

.nav-logo:hover {
    transform: scale(1.05);
    filter: brightness(1.2);
}

/* ==========================================
   导航菜单
   ========================================== */
.nav-menu {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xl, 2rem);
    flex: 1;
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg, 1.5rem);
    align-items: center;
    justify-content: center;
    flex: 1;
}

/* 导航项 */
.nav-item {
    position: relative;
    color: var(--white, #FFFFFF);
    text-decoration: none;
    font-size: var(--text-base, 1rem);
    font-weight: 500;
    padding: 8px 0;
    transition: all var(--transition-base, 0.3s ease);
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.nav-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-gold, #D4AF37), var(--soft-gold, #F4E4C1));
    transition: width var(--transition-base, 0.3s ease);
}

[dir="rtl"] .nav-item::after {
    left: auto;
    right: 0;
}

.nav-item:hover {
    color: var(--accent-gold, #D4AF37);
}

.nav-item:hover::after {
    width: 100%;
}

.nav-item.active {
    color: var(--accent-gold, #D4AF37);
}

.nav-item.active::after {
    width: 100%;
}

/* ==========================================
   语言切换器（奢华优雅的下拉菜单设计）
   ========================================== */
.nav-language-switcher {
    position: relative;
}

/* 下拉按钮 */
.lang-dropdown-button {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.8), rgba(20, 20, 20, 0.9));
    border: 1px solid rgba(212, 175, 55, 0.3);
    border-radius: 8px;
    color: var(--accent-gold, #D4AF37);
    font-size: var(--text-sm, 0.875rem);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base, 0.3s ease);
    backdrop-filter: blur(10px);
    letter-spacing: 0.5px;
    min-width: 120px;
    justify-content: space-between;
}

.lang-dropdown-button:hover {
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.15), rgba(212, 175, 55, 0.1));
    border-color: var(--accent-gold, #D4AF37);
    box-shadow: 0 4px 16px rgba(212, 175, 55, 0.25);
    transform: translateY(-1px);
}

.lang-dropdown-button:active {
    transform: translateY(0);
}

.current-lang-text {
    flex: 1;
    text-align: left;
}

[dir="rtl"] .current-lang-text {
    text-align: right;
}

.lang-dropdown-icon {
    transition: transform var(--transition-base, 0.3s ease);
    flex-shrink: 0;
}

.lang-dropdown-button[aria-expanded="true"] .lang-dropdown-icon {
    transform: rotate(180deg);
}

/* 下拉菜单 */
.lang-dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 140px;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.95), rgba(20, 20, 20, 0.98));
    border: 1px solid rgba(212, 175, 55, 0.3);
    border-radius: 8px;
    backdrop-filter: blur(20px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6),
                0 0 0 1px rgba(212, 175, 55, 0.1) inset;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base, 0.3s ease);
    z-index: 1000;
    overflow: hidden;
}

[dir="rtl"] .lang-dropdown-menu {
    right: auto;
    left: 0;
}

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

/* 语言选项 */
.lang-option {
    display: block;
    width: 100%;
    padding: 12px 16px;
    background: transparent;
    border: none;
    color: var(--white, #FFFFFF);
    font-size: var(--text-sm, 0.875rem);
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-base, 0.3s ease);
    position: relative;
    letter-spacing: 0.5px;
}

[dir="rtl"] .lang-option {
    text-align: right;
}

.lang-option:hover {
    background: linear-gradient(90deg, rgba(212, 175, 55, 0.15), rgba(212, 175, 55, 0.05));
    color: var(--accent-gold, #D4AF37);
    padding-left: 20px;
}

[dir="rtl"] .lang-option:hover {
    padding-left: 16px;
    padding-right: 20px;
}

.lang-option.active {
    background: linear-gradient(90deg, rgba(212, 175, 55, 0.2), rgba(212, 175, 55, 0.1));
    color: var(--accent-gold, #D4AF37);
    font-weight: 600;
}

.lang-option.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--accent-gold, #D4AF37), var(--soft-gold, #F4E4C1));
}

[dir="rtl"] .lang-option.active::before {
    left: auto;
    right: 0;
}

/* 分隔线效果 */
.lang-option:not(:last-child) {
    border-bottom: 1px solid rgba(212, 175, 55, 0.1);
}

/* ==========================================
   汉堡菜单按钮（移动端）
   ========================================== */
.nav-hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: 1px solid rgba(212, 175, 55, 0.3);
    border-radius: var(--radius-sm, 0.25rem);
    cursor: pointer;
    padding: 0;
    transition: all var(--transition-base, 0.3s ease);
    z-index: 1001;
}

.nav-hamburger:hover {
    background: rgba(212, 175, 55, 0.1);
    border-color: var(--accent-gold, #D4AF37);
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background: var(--accent-gold, #D4AF37);
    border-radius: 2px;
    transition: all var(--transition-base, 0.3s ease);
    margin: 3px 0;
}

/* 汉堡菜单激活状态 */
.nav-hamburger[aria-expanded="true"] .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translateY(8px);
}

.nav-hamburger[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
}

.nav-hamburger[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translateY(-8px);
}

/* ==========================================
   平板设备适配
   ========================================== */
@media (max-width: 1024px) {
    .nav-container {
        padding: var(--spacing-sm, 0.75rem) var(--spacing-lg, 1.5rem);
    }

    .nav-links {
        gap: var(--spacing-md, 1rem);
    }

    .nav-menu {
        gap: var(--spacing-lg, 1.5rem);
    }

    .nav-item {
        font-size: var(--text-sm, 0.875rem);
    }
}

/* ==========================================
   移动端适配
   ========================================== */
@media (max-width: 768px) {
    .nav-hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: 0;
        width: 280px;
        height: 100vh;
        background: rgba(0, 0, 0, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: flex-start;
        align-items: stretch;
        gap: 0;
        padding: 80px 0 var(--spacing-xl, 2rem);
        transform: translateX(100%);
        transition: transform var(--transition-base, 0.3s ease);
        border-left: 1px solid rgba(212, 175, 55, 0.2);
        box-shadow: -4px 0 20px rgba(0, 0, 0, 0.5);
    }

    [dir="rtl"] .nav-menu {
        right: auto;
        left: 0;
        transform: translateX(-100%);
        border-left: none;
        border-right: 1px solid rgba(212, 175, 55, 0.2);
    }

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

    .nav-links {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        width: 100%;
        padding: var(--spacing-lg, 1.5rem) 0;
    }

    .nav-item {
        padding: var(--spacing-md, 1rem) var(--spacing-xl, 2rem);
        font-size: var(--text-lg, 1.125rem);
        border-bottom: 1px solid rgba(212, 175, 55, 0.1);
    }

    .nav-item::after {
        display: none;
    }

    .nav-item:hover,
    .nav-item.active {
        background: rgba(212, 175, 55, 0.1);
    }

    .nav-language-switcher {
        margin: var(--spacing-lg, 1.5rem) var(--spacing-xl, 2rem);
    }

    .lang-dropdown-button {
        width: 100%;
        justify-content: center;
    }

    .lang-dropdown-menu {
        width: calc(100% - var(--spacing-xl, 2rem) * 2);
        left: var(--spacing-xl, 2rem);
        right: var(--spacing-xl, 2rem);
    }
}

/* ==========================================
   超小屏幕适配
   ========================================== */
@media (max-width: 480px) {
    .nav-container {
        padding: var(--spacing-sm, 0.75rem) var(--spacing-md, 1rem);
    }

    .nav-logo {
        font-size: var(--text-xl, 1.25rem);
    }

    .nav-menu {
        width: 100%;
    }

    .nav-item {
        font-size: var(--text-base, 1rem);
        padding: var(--spacing-sm, 0.75rem) var(--spacing-lg, 1.5rem);
    }

    .nav-language-switcher {
        margin: var(--spacing-md, 1rem) var(--spacing-lg, 1.5rem);
    }
}

/* ==========================================
   RTL 特定样式调整
   ========================================== */
/* direction: rtl 会反转.nav-container的子元素（Logo和Menu）
   但我们需要保持.nav-links内部链接的原始顺序 */

[dir="rtl"] .nav-links {
    /* 抵消父元素direction的影响，保持链接原始顺序 */
    direction: ltr;
}

[dir="rtl"] .nav-logo,
[dir="rtl"] .nav-item {
    font-family: var(--font-arabic, 'Noto Sans Arabic', sans-serif);
}

/* ==========================================
   打印样式
   ========================================== */
@media print {
    .navigation {
        position: static;
        border-bottom: 1px solid #000;
        background: white;
    }

    .nav-hamburger,
    .nav-language-switcher {
        display: none;
    }

    .nav-menu {
        display: flex;
    }
}

/* ==========================================
   无障碍支持
   ========================================== */
.nav-item:focus,
.lang-dropdown-button:focus,
.lang-option:focus,
.nav-hamburger:focus {
    outline: 2px solid var(--accent-gold, #D4AF37);
    outline-offset: 2px;
}

.nav-item:focus:not(:focus-visible),
.lang-dropdown-button:focus:not(:focus-visible),
.lang-option:focus:not(:focus-visible),
.nav-hamburger:focus:not(:focus-visible) {
    outline: none;
}

/* ==========================================
   减少动画模式
   ========================================== */
@media (prefers-reduced-motion: reduce) {
    .navigation,
    .nav-item,
    .nav-item::after,
    .lang-dropdown-button,
    .lang-dropdown-menu,
    .lang-dropdown-icon,
    .lang-option,
    .nav-hamburger,
    .hamburger-line,
    .nav-menu {
        transition-duration: 0.01ms !important;
    }
}

/* ==========================================
   高对比度模式支持
   ========================================== */
@media (prefers-contrast: high) {
    .navigation {
        border-bottom-width: 2px;
    }

    .lang-dropdown-button,
    .lang-dropdown-menu,
    .nav-hamburger {
        border-width: 2px;
    }
}