/* ========== 导航栏样式 ========== */

.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    transition: all var(--transition-duration) var(--transition-timing);
}

.navbar-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-logo {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.logo-image {
    height: 42px;
    width: auto;
    object-fit: contain;
    display: block;
}

.logo-label {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 1.5rem;
    line-height: 1;
    display: inline-block;
}

.navbar-menu {
    display: flex;
    gap: 0;
    list-style: none;
}

.nav-link {
    padding: 0.75rem 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.95rem;
    border-radius: 4px;
    transition: all var(--transition-duration) var(--transition-timing);
    position: relative;
    cursor: pointer;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    border-radius: 1px;
    transform: translateX(-50%);
    transition: width var(--transition-duration) var(--transition-timing);
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent-color);
}

.nav-link.active::after,
.nav-link:hover::after {
    width: 40%;
}

/* ========== 导航栏下拉菜单样式 ========== */

.navbar-dropdown-container {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    width: 100%;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
    z-index: 999;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-duration) var(--transition-timing);
    pointer-events: none;
}

.navbar-dropdown-container.active {
    max-height: 350px;
    pointer-events: auto;
}

.dropdown-panel {
    display: none;
    padding: 2rem;
}

.dropdown-panel.active {
    display: block;
}

.dropdown-wrapper {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 220px 1fr;
    grid-template-rows: auto auto;
    gap: 2rem;
    align-items: start;
}

.dropdown-image {
    width: 100%;
    height: 180px;
    border-radius: 8px;
    overflow: hidden;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(0, 0, 0, 0.05) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    grid-row: 2;
    grid-column: 1;
}

.placeholder-image {
    background-color: var(--bg-secondary);
}

.dropdown-header {
    grid-column: 1 / -1;
    grid-row: 1;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding-right: 2rem;
}

.dropdown-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    background: linear-gradient(135deg, var(--accent-color), #7c3aed);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

[data-theme="dark"] .dropdown-title {
    background: linear-gradient(135deg, #3b82f6, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.dropdown-subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.5;
}

.dropdown-content {
    display: flex;
    flex-direction: column;
    gap: 0;
    justify-content: flex-start;
    grid-column: 2;
    grid-row: 2;
}

.dropdown-link {
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.95rem;
    border-left: 3px solid transparent;
    transition: all var(--transition-duration) var(--transition-timing);
    cursor: pointer;
}

.dropdown-link:hover {
    background-color: var(--bg-secondary);
    color: var(--accent-color);
    border-left-color: var(--accent-color);
    padding-left: 1.25rem;
}

/* ========== 导航栏控制按钮 ========== */

.navbar-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: all var(--transition-duration) var(--transition-timing);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2em;
    height: 2em;
    font-size: 1.5rem;
}

.theme-toggle:hover {
    background-color: var(--bg-secondary);
}

.theme-toggle input[type="checkbox"] {
    display: none;
}

.theme-toggle svg {
    width: 100%;
    height: 100%;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--text-primary);
    transition: all var(--transition-duration) var(--transition-timing);
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-duration) var(--transition-timing);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translateY(8px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translateY(-8px);
}

/* ========== 主题切换SVG动画 ========== */

.theme-toggle input[type="checkbox"]:checked~.theme-toggle__classic {
    transform: scale(-1, 1);
}

[data-theme="dark"] .theme-toggle__classic {
    color: var(--text-primary);
}

/* 深色主题下的导航栏下拉菜单阴影 */
[data-theme="dark"] .navbar-dropdown-container {
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
}