/**
 * 星谱智防 - Layout Styles
 * Header, Footer, Navigation, Search Modal
 */

/* ========== Background Decoration ========== */
.bg-mesh {
    background-image: var(--gradient-mesh);
    background-attachment: fixed;
}

/* ========== Reading Progress ========== */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: var(--gradient-primary);
    z-index: 9999;
    transition: width 0.1s linear;
    width: 0;
}

/* ========== Site Header ========== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    z-index: var(--z-fixed);
    transition: all var(--duration-normal) var(--easing);
    background: transparent;
}

.site-header.scrolled {
    background: rgba(10, 22, 40, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 102, 204, 0.15);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.header-inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xl);
}

/* Logo */
.site-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    flex-shrink: 0;
}

.site-logo img {
    height: 80px;
    width: auto;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.logo-text::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    background: var(--color-secondary);
    border-radius: 50%;
    margin-right: 8px;
    box-shadow: 0 0 10px var(--color-secondary);
}

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

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    list-style: none;
    margin: 0;
    padding: 0;
}

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

.nav-list > li > a {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: rgba(255, 255, 255, 0.75);
    border-radius: var(--radius-lg);
    transition: all var(--duration-fast) var(--easing);
    white-space: nowrap;
}

.nav-list > li > a:hover,
.nav-list > li.active > a {
    color: #fff;
    background: rgba(0, 102, 204, 0.2);
}

.nav-list > li > a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--color-secondary);
    border-radius: var(--radius-full);
    transition: width var(--duration-fast) var(--easing);
}

.nav-list > li > a:hover::before,
.nav-list > li.active > a::before {
    width: 24px;
}

/* 桌面端下拉菜单指示箭头 */
.nav-list > li.has-dropdown > a::after {
    content: '';
    width: 6px;
    height: 6px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(45deg) translateY(-2px);
    opacity: 0.7;
    transition: transform var(--duration-fast) var(--easing), opacity var(--duration-fast) var(--easing);
}

.nav-list > li.has-dropdown:hover > a::after {
    transform: rotate(225deg) translateY(-1px);
    opacity: 1;
}

/* Dropdown Menu */
.nav-list .has-dropdown {
    position: relative;
}

.nav-list .dropdown {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    min-width: 200px;
    background: rgba(10, 22, 40, 0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(0, 102, 204, 0.2);
    padding: var(--spacing-sm);
    opacity: 0;
    visibility: hidden;
    transition: all var(--duration-fast) var(--easing);
    list-style: none;
    z-index: var(--z-dropdown);
}

.nav-list .has-dropdown:hover .dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.nav-list .dropdown li a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-md);
    transition: all var(--duration-fast) var(--easing);
}

.nav-list .dropdown li a:hover {
    color: #fff;
    background: rgba(0, 102, 204, 0.15);
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-shrink: 0;
}

/* Header Search */
.header-search .search-trigger {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: rgba(255, 255, 255, 0.7);
    background: rgba(255, 255, 255, 0.08);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--duration-fast) var(--easing);
}

.header-search .search-trigger:hover {
    color: #fff;
    background: rgba(0, 102, 204, 0.3);
}

/* Header CTA */
.header-cta {
    font-size: var(--font-size-xs) !important;
    padding: 6px 16px !important;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 1080;
    width: 40px;
    height: 40px;
    color: #fff;
    background: transparent;
    border: none;
    cursor: pointer;
    touch-action: manipulation;
}

.mobile-menu-toggle .hamburger {
    width: 20px;
    height: 14px;
    position: relative;
}

.mobile-menu-toggle .hamburger span {
    display: block;
    position: absolute;
    height: 2px;
    width: 100%;
    background: currentColor;
    border-radius: var(--radius-full);
    transition: all var(--duration-fast) var(--easing);
}

.mobile-menu-toggle .hamburger span:nth-child(1) { top: 0; }
.mobile-menu-toggle .hamburger span:nth-child(2) { top: 6px; }
.mobile-menu-toggle .hamburger span:nth-child(3) { top: 12px; }

.mobile-menu-toggle.active .hamburger span:nth-child(1) {
    top: 6px;
    transform: rotate(45deg);
}

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

.mobile-menu-toggle.active .hamburger span:nth-child(3) {
    top: 6px;
    transform: rotate(-45deg);
}

/* ========== Site Main ========== */
.site-main {
    min-height: 100vh;
}

/* ========== Site Footer ========== */
.site-footer {
    background: #0a1628;
    color: rgba(255, 255, 255, 0.7);
    position: relative;
    overflow: hidden;
}

.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
}

.footer-main {
    padding: var(--spacing-4xl) 0 var(--spacing-3xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr) 1.6fr;
    gap: var(--spacing-2xl);
}

.footer-about {
    padding-left: var(--spacing-xl);
}

.footer-about .footer-logo {
    margin-bottom: var(--spacing-lg);
}

.footer-brand .logo-text {
    font-size: 1.5rem;
}

.footer-desc {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.5);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
}

.footer-contact-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.footer-contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
}

.footer-contact-item i {
    width: 16px;
    color: var(--color-secondary);
    font-size: 0.875rem;
}

.footer-column h4 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-xl);
    color: #fff;
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.footer-column h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px;
    height: 2px;
    background: var(--color-secondary);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.5);
    transition: all var(--duration-fast) var(--easing);
}

.footer-links a:hover {
    color: var(--color-secondary);
    padding-left: var(--spacing-sm);
}

/* Footer Bottom */
.footer-bottom {
    padding: var(--spacing-lg) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-bottom-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: var(--font-size-xs);
    color: rgba(255, 255, 255, 0.35);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.35);
}

.footer-bottom a:hover {
    color: var(--color-secondary);
}

.footer-divider {
    margin: 0 var(--spacing-sm);
}

/* ========== Back to Top ========== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--duration-normal) var(--easing);
    box-shadow: var(--shadow-glow);
    z-index: var(--z-fixed);
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 102, 204, 0.5);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* ========== Search Modal ========== */
.search-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 15vh;
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: all var(--duration-normal) var(--easing);
}

.search-modal.active {
    opacity: 1;
    visibility: visible;
}

.search-modal-content {
    width: 100%;
    max-width: 640px;
    background: rgba(10, 22, 40, 0.95);
    border-radius: var(--radius-2xl);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(0, 102, 204, 0.2);
    transform: translateY(-20px) scale(0.95);
    transition: transform var(--duration-normal) var(--easing);
}

.search-modal.active .search-modal-content {
    transform: translateY(0) scale(1);
}

.search-modal-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg) var(--spacing-xl);
}

.search-modal-header .search-icon {
    color: var(--color-secondary);
    font-size: 1.125rem;
}

.search-modal-header input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: var(--font-size-lg);
    color: #fff;
    outline: none;
}

.search-modal-header input::placeholder {
    color: rgba(255, 255, 255, 0.35);
}

.search-modal-header .search-close {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
    color: rgba(255, 255, 255, 0.5);
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--duration-fast) var(--easing);
}

.search-modal-header .search-close:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.15);
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-about {
        grid-column: span 2;
    }
}

@media (max-width: 768px) {
    /* 头部毛玻璃/filter 会为 position:fixed 的移动抽屉建立“包含块”，把抽屉锁在头部小盒子内导致无法完整显示 */
    .site-header.scrolled,
    .site-header {
        -webkit-backdrop-filter: none;
        backdrop-filter: none;
    }

    body.nav-open {
        overflow: hidden;
    }

    .main-nav {
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        width: min(84vw, 340px);
        background: rgba(10, 22, 40, 0.985);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: flex-start;
        padding: 1.25rem 16px 1.5rem;
        transform: translateX(100%);
        transition: transform var(--duration-normal) var(--easing);
        z-index: var(--z-modal);
        box-shadow: -10px 0 40px rgba(0, 0, 0, 0.45);
        border-left: 1px solid rgba(0, 102, 204, 0.2);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

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

    .nav-list {
        flex-direction: column;
        align-items: stretch;
        width: 100%;
    }

    .nav-list > li > a {
        position: relative;
        padding: 0.55rem 0.875rem;
        font-size: var(--font-size-base);
        color: rgba(255, 255, 255, 0.85);
        border-radius: var(--radius-lg);
        justify-content: space-between;
    }

    /* 移动端展开箭头 */
    .nav-list > li.has-dropdown > a::after {
        display: block;
        transform: rotate(45deg) translateY(-3px);
    }

    .nav-list > li.has-dropdown.dropdown-open > a::after {
        transform: rotate(225deg) translateY(-1px);
    }

    .nav-list .dropdown {
        position: static;
        left: auto;
        transform: none;
        opacity: 1;
        visibility: visible;
        box-shadow: none;
        border: none;
        background: rgba(0, 102, 204, 0.08);
        padding: 4px;
        border-radius: var(--radius-lg);
        margin: 2px 0.75rem 8px 0.875rem;
        max-height: 0;
        overflow: hidden;
        display: block;
        transition: max-height var(--duration-normal) var(--easing);
    }

    .nav-list .has-dropdown:hover .dropdown,
    .nav-list .has-dropdown.dropdown-open .dropdown {
        transform: none;
        opacity: 1;
        visibility: visible;
    }

    .nav-list .has-dropdown.dropdown-open .dropdown {
        max-height: 520px;
    }

    .nav-list .dropdown li a {
        padding: 8px 14px;
        font-size: 0.9rem;
        color: rgba(255, 255, 255, 0.78);
        border-left: 2px solid rgba(0, 212, 255, 0.35);
        border-radius: 0 var(--radius-md) var(--radius-md) 0;
        margin-bottom: 2px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .nav-list .dropdown li a:hover {
        color: #fff;
        background: rgba(0, 102, 204, 0.15);
        border-left-color: var(--color-secondary);
    }

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

    .header-actions .header-search,
    .header-actions .header-cta {
        display: none;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-brand {
        grid-column: span 1;
    }

    .footer-contact-items {
        align-items: center;
    }

    .footer-column h4::after {
        left: 50%;
        transform: translateX(-50%);
    }

    .footer-bottom-inner {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
    }
}