/* ===================================
   导航栏样式 - 贵州山海同创数字文化传媒有限公司
   =================================== */

@import url('variables.css');

/* ========== 头部导航栏 ========== */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(8, 8, 23, 0.6);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    z-index: var(--z-index-fixed);
    transition: all var(--transition-fast);
}

header.scrolled {
    background: rgba(8, 8, 23, 0.92);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.45);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: 100%;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    flex-wrap: nowrap;
}

/* ========== Logo ========== */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--color-text-dark);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    transition: transform var(--transition-fast), color var(--transition-fast);
    white-space: nowrap;
    flex-shrink: 0;
}

.logo:hover {
    color: var(--color-primary);
    transform: translateY(-1px);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    box-shadow: 0 0 20px rgba(255, 110, 199, 0.45);
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-white);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.logo-text-main {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
}

.logo-text-sub {
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
    font-weight: var(--font-weight-normal);
}

/* ========== 导航菜单 ========== */
nav {
    flex: 1;
    margin-left: var(--spacing-md);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xs);
    align-items: center;
    height: 100%;
    flex-wrap: nowrap;
}

.nav-item {
    position: relative;
    height: 100%;
    display: flex;
    align-items: center;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--color-text-light);
    font-weight: var(--font-weight-medium);
    letter-spacing: 0.02em;
    text-transform: uppercase;
    transition: color var(--transition-fast), transform var(--transition-fast);
    position: relative;
    white-space: nowrap;
    font-size: var(--font-size-sm);
}

.nav-link:hover {
    color: var(--color-text-dark);
    transform: translateY(-2px);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transition: width var(--transition-fast);
}

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

.nav-item.active > .nav-link {
    color: var(--color-text-dark);
}

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

/* ========== 下拉菜单 ========== */
.dropdown-toggle::after {
    content: '▼';
    font-size: var(--font-size-xs);
    margin-left: var(--spacing-xs);
    transition: transform var(--transition-fast);
}

.nav-item:hover .dropdown-toggle::after {
    transform: rotate(-180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: rgba(20, 20, 43, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--border-radius-md);
    box-shadow: 0 24px 50px rgba(0, 0, 0, 0.45);
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    z-index: var(--z-index-dropdown);
    margin-top: var(--spacing-xs);
    backdrop-filter: blur(12px);
}

.nav-item:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-medium);
    text-decoration: none;
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
}

.dropdown-item:hover {
    background: rgba(8, 247, 254, 0.08);
    color: var(--color-text-dark);
    border-left-color: var(--color-primary);
    padding-left: calc(var(--spacing-md) + 4px);
}

.dropdown-item.active {
    background: rgba(255, 110, 199, 0.08);
    color: var(--color-text-dark);
    border-left-color: var(--color-primary);
    font-weight: var(--font-weight-medium);
}

/* ========== 右侧操作区 ========== */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.search-box {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--border-radius-full);
    padding: var(--spacing-xs) var(--spacing-sm);
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

.search-box:hover,
.search-box:focus-within {
    border-color: rgba(8, 247, 254, 0.4);
    box-shadow: 0 0 20px rgba(8, 247, 254, 0.2);
}

.search-box input {
    border: none;
    background: transparent;
    padding: 0;
    width: 100px;
}

.search-box input::placeholder {
    color: var(--color-text-light);
}

.search-box input:focus {
    outline: none;
    box-shadow: none;
}

.search-box button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-light);
    padding: 0;
    transition: color var(--transition-fast);
}

.search-box button:hover {
    color: var(--color-accent);
}

/* ========== 汉堡菜单 (移动端) ========== */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 0;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background-color: var(--color-text-dark);
    transition: all var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ========== 移动端响应 ========== */
@media (max-width: 1100px) {
    .hamburger {
        display: flex;
    }

    nav {
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: rgba(8, 8, 23, 0.96);
        border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-normal);
        z-index: var(--z-index-fixed);
        backdrop-filter: blur(18px);
    }

    nav.active {
        max-height: 500px;
    }

    .nav-menu {
        flex-direction: column;
        gap: 0;
        align-items: stretch;
        padding: var(--spacing-md) 0;
    }

    .nav-item {
        height: auto;
        border-bottom: var(--border-width-thin) solid var(--color-border);
    }

    .nav-link {
        padding: var(--spacing-sm) var(--spacing-md);
        width: 100%;
    }

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

    .dropdown-menu {
        position: static;
        opacity: 0;
        visibility: hidden;
        max-height: 0;
        overflow: hidden;
        border: none;
        border-left: 3px solid var(--color-primary);
        border-radius: 0;
        box-shadow: none;
        margin-top: 0;
        transform: none;
        transition: all var(--transition-fast);
    }

    .nav-item.active .dropdown-menu,
    .nav-item:hover .dropdown-menu {
        opacity: 1;
        visibility: visible;
        max-height: 300px;
    }

    .dropdown-item {
        padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) var(--spacing-lg);
    }

    .search-box {
        display: none;
    }

    .header-container {
        padding: 0 var(--spacing-sm);
    }

    .logo-text-sub {
        display: none;
    }
}

@media (max-width: 480px) {
    .header-actions {
        gap: var(--spacing-sm);
    }

    .logo-text-main {
        font-size: var(--font-size-sm);
    }

    .logo-icon {
        width: 32px;
        height: 32px;
        font-size: var(--font-size-base);
    }
}