/* 
 * Bootstrap 5 Compliant Navigation System - Optimized
 * 符合Bootstrap 5规范的导航系统 - 优化版
 */

/* ===== CSS VARIABLES ===== */
:root {
    --navbar-height: 100px;
    --navbar-height-mobile: 70px;
    --navbar-shadow: var(--bs-box-shadow, 0 0.5rem 1rem rgba(0, 0, 0, 0.15));
    --navbar-transition: all 0.15s ease-in-out;
    --bs-card-bg: color-mix(in srgb, var(--bs-body-bg), black 3%);
}

[data-bs-theme="dark"] {
    --navbar-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.3);
    --bs-card-bg: color-mix(in srgb, var(--bs-body-bg), white 10%);
}

/* .card {
    background-color: var(--bs-card-bg) !important;
} */

/* 自定义卡片背景色：基于页面背景色动态混合 */
:root {
    .card {
        --bs-card-bg: color-mix(in srgb, var(--bs-body-bg), black 3%);
    }
}

[data-bs-theme="dark"] {
    .card {
        --bs-card-bg: color-mix(in srgb, var(--bs-body-bg), white 10%);
    }
}

.text-justify {
    text-align: justify;
    text-justify: inter-word;
}

.bg-gray {
    background-color: rgba(223, 227, 230, 0.3);
}

/* ===== BASE NAVBAR STYLES ===== */
.navbar {
    height: var(--navbar-height);
    background-color: var(--bs-body-bg) !important;
    box-shadow: var(--navbar-shadow);
    transition: var(--navbar-transition);
    padding: 0;
}

.navbar .container {
    height: 100%;
    align-items: center;
    padding: 0 var(--bs-gutter-x, 0.75rem);
    display: flex;
}

/* ===== LOGO SYSTEM ===== */
.navbar-brand {
    padding: 0;
    margin: 0;
}

.logo-container {
    position: relative;
    width: 220px;
    height: 40px;
    display: flex;
    align-items: center;
}

.logo-transparent,
.logo-solid {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: auto;
    transition: opacity 0.3s ease;
}

/* Logo switching logic - consolidated */
.logo-transparent {
    opacity: 0;
}

.logo-solid {
    opacity: 1;
}

.navbar-transparent .logo-transparent,
[data-theme="dark"] .logo-transparent {
    opacity: 1;
}

.navbar-transparent .logo-solid,
[data-theme="dark"] .logo-solid {
    opacity: 0;
}

/* ===== NAVIGATION LINKS ===== */
.navbar-nav .nav-link {
    color: var(--bs-navbar-color, #212529) !important;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 2rem 1rem !important;
    transition: var(--navbar-transition);
}

.navbar-nav .nav-link:hover {
    color: var(--bs-primary, #0d6efd) !important;
}

/* ===== NAVBAR ACTIONS (BUTTONS) ===== */
.navbar-actions {
    gap: 0.25rem;
    align-items: center;
}

/* 统一的按钮样式 */
.navbar-actions .btn,
.navbar-action-btn {
    border-radius: 50%;
    width: 40px;
    height: 40px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    transition: var(--navbar-transition);
}

/* 统一的hover效果 - 自适应颜色 */
.navbar-actions .btn:hover,
.navbar-actions .btn:focus,
.navbar-action-btn:hover,
.navbar-action-btn:focus {
    background-color: var(--bs-secondary-bg, rgba(108, 117, 125, 0.6));
    /* border: 1px solid var(--bs-border-color, rgba(0, 0, 0, 0.8)); */
    /* transform: translateY(-1px);*/
    /* outline: none; */
}

.navbar-actions .dropdown-toggle-split::after {
    display: none;
}

/* ===== DROPDOWN MENUS ===== */
.dropdown-item {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.dropdown-item.active,
.dropdown-item:active {
    background-color: var(--bs-info, #0dcaf0);
    /* color: var(--bs-white, #ffffff); */
}

/* ===== NAVBAR STATES ===== */
/* Transparent state */
.navbar-transparent {
    background-color: transparent !important;
    box-shadow: none !important;
}

.navbar-transparent .navbar-nav .nav-link,
.navbar-transparent .navbar-actions .btn,
.navbar-transparent .navbar-action-btn {
    color: #ffffff !important;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

/* 透明导航栏的hover效果 */
/* .navbar-transparent .navbar-actions .btn:hover,
.navbar-transparent .navbar-actions .btn:focus,
.navbar-transparent .navbar-action-btn:hover,
.navbar-transparent .navbar-action-btn:focus {
    background-color: rgba(255, 255, 255, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.8);
} */

.navbar-transparent .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.8%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Solid state */
.navbar-solid {
    background-color: var(--bs-body-bg, #ffffff) !important;
    box-shadow: var(--navbar-shadow) !important;
}

.navbar-solid .navbar-nav .nav-link,
.navbar-solid .navbar-actions .btn,
.navbar-solid .navbar-action-btn {
    color: var(--bs-navbar-color, #212529) !important;
    text-shadow: none !important;
}

.navbar-solid .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%2833, 37, 41, 0.75%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Scroll behavior */
.navbar-hidden {
    transform: translateY(-100%);
}

.navbar-visible {
    transform: translateY(0);
}

/* ===== THEME ICON ANIMATION ===== */
.theme-icon {
    transition: transform 0.3s ease;
    font-size: 1.1rem;
    line-height: 1;
}

.navbar-actions .btn:hover .theme-icon,
.navbar-action-btn:hover .theme-icon {
    transform: rotate(20deg) scale(1.1);
}

.navbar-actions .btn:hover .language-icon,
.navbar-action-btn:hover .language-icon {
    transform: scale(1.1);
}

/* ===== NAVBAR TOGGLER ===== */
.navbar-toggler {
    border: none;
    padding: 0.25rem 0.5rem;
}

.navbar-toggler:focus {
    box-shadow: none;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 991.98px) {
    .navbar {
        height: var(--navbar-height-mobile);
    }

    .logo-container {
        width: 126px;
        height: 32px;
    }

    /* Mobile navbar collapse */
    .navbar-collapse {
        position: fixed;
        top: 68px;
        left: 0;
        width: 100%;
        background-color: var(--bs-body-bg, #ffffff);
        border-top: 1px solid rgba(0, 0, 0, 0.1);
        margin-top: 1px;
        box-shadow: var(--navbar-shadow);
    }

    .navbar-nav {
        padding: 0.5rem 0;
    }

    .navbar-nav .nav-item {
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }

    .navbar-nav .nav-link {
        padding: 1rem 1.5rem !important;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    /* Mobile dropdown menus */
    .navbar-nav .dropdown-menu {
        position: static !important;
        background-color: #f8f9fa;
        border: none;
        box-shadow: none;
        margin: 0;
        padding: 0;
        width: 100%;
    }

    .navbar-nav .dropdown-item {
        padding: 0.75rem 2rem;
        color: #666;
        position: relative;
    }

    .navbar-nav .dropdown-item::before {
        content: '•';
        color: #ccc;
        margin-right: 0.5rem;
        font-size: 0.8rem;
    }

    .navbar-nav .dropdown-item:hover {
        background-color: #e9ecef;
        color: var(--bs-primary, #0d6efd);
    }

    .navbar-nav .dropdown-item:hover::before {
        color: var(--bs-primary, #0d6efd);
    }
}

@media (min-width: 992px) {

    /* Desktop layout */
    .navbar .container {
        justify-content: space-between;
    }

    .navbar-brand {
        flex: 0 0 auto;
    }

    .navbar-collapse {
        flex: 1;
        display: flex !important;
        justify-content: flex-end;
        align-items: center;
    }

    .navbar-nav {
        flex: 0 0 auto;
        margin-right: 2rem;
        margin-left: 3rem;
    }

    .navbar-actions {
        flex: 0 0 auto;
    }

    /* Desktop dropdown menus */
    .navbar-nav .dropdown-menu {
        position: absolute !important;
        top: 100% !important;
        left: 0 !important;
        margin-top: -0.5rem !important;
        border: none;
        border-top: 1px solid rgba(0, 0, 0, 0.1);
        box-shadow: var(--navbar-shadow);
        border-radius: 8px;
        padding: 0.5rem 0;
        min-width: 220px;
        background-color: var(--bs-body-bg, #ffffff);
        display: none;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.2s ease, visibility 0.2s ease;
    }

    .navbar-nav .dropdown-menu-end {
        left: auto !important;
        right: 0 !important;
    }

    .navbar-nav .dropdown:hover .dropdown-menu {
        display: block !important;
        opacity: 1 !important;
        visibility: visible !important;
    }

    .navbar-nav .dropdown-item:hover {
        background-color: var(--bs-primary-bg-subtle, #cfe2ff);
        color: var(--bs-primary, #0d6efd);
    }
}

/* ===== DARK THEME SUPPORT ===== */
[data-bs-theme="dark"],
[data-theme="dark"] {

    /* Navbar solid state in dark theme */
    .navbar-solid {
        background-color: var(--bs-dark, #212529) !important;
    }

    .navbar-solid .navbar-nav .nav-link,
    .navbar-solid .navbar-actions .btn,
    .navbar-solid .navbar-action-btn {
        color: var(--bs-light, #f8f9fa) !important;
    }

    /* Toggler icon */
    .navbar-toggler-icon,
    .navbar-solid .navbar-toggler-icon {
        background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.8%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }

    /* Dropdown menus */
    .navbar-nav .dropdown-menu {
        background-color: var(--bs-dark, #212529);
    }

    .navbar-nav .dropdown-item {
        color: var(--bs-light, #f8f9fa);
    }

    .navbar-nav .dropdown-item:hover {
        background-color: rgba(255, 255, 255, 0.1);
        color: var(--bs-primary, #0d6efd);
    }
}

/* Mobile dark theme specific */
@media (max-width: 991.98px) {
    [data-theme="dark"] {
        .navbar-nav .dropdown-menu {
            background-color: #2d2d2d;
        }

        .navbar-nav .dropdown-item {
            color: #b0b0b0;
            border-bottom-color: rgba(255, 255, 255, 0.1);
        }
    }
}

/* ===== GLOBAL TRANSITIONS ===== */
.navbar,
.navbar-nav .nav-link,
.navbar-actions .btn,
.navbar-action-btn,
.dropdown-menu,
.dropdown-item {
    transition: var(--navbar-transition);
}