/* ============================================
   贵州思南兴黔船业 - 布局样式（江河远航主题）
   ============================================ */

@import url('variables.css');

/* ========== 导航栏 ========== */
.navbar {
    position: fixed;
    inset: 0 0 auto 0;
    height: var(--navbar-height);
    background: var(--navbar-background);
    backdrop-filter: blur(16px);
    box-shadow: 0 12px 30px rgba(0, 8, 64, 0.25);
    z-index: 1000;
    transition: background var(--transition-fast), height var(--transition-fast);
}

.navbar.is-scrolled {
    background: rgba(0, 8, 64, 0.92);
    height: 70px;
}

.navbar-container {
    max-width: var(--container-max-width);
    height: 100%;
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--navbar-text-color);
    text-decoration: none;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
    position: relative;
}

.navbar-brand-logo {
    width: 52px;
    height: 52px;
    border-radius: var(--border-radius-xl);
    background: linear-gradient(135deg, rgba(240, 248, 255, 0.28), rgba(255, 255, 255, 0.08));
    display: grid;
    place-items: center;
    font-size: 1.5rem;
    font-weight: var(--font-weight-extrabold);
    color: var(--color-text-on-primary);
    box-shadow: inset 0 0 0 1px rgba(240, 248, 255, 0.35);
}

.navbar-menu {
    display: flex;
    align-items: center;
    list-style: none;
    gap: var(--spacing-lg);
    margin-left: auto;
}

.navbar-item {
    position: relative;
}

.navbar-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--navbar-text-color);
    font-weight: var(--font-weight-medium);
    padding: var(--spacing-sm) 0;
    position: relative;
    transition: color var(--transition-fast);
}

.navbar-link::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -6px;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent), #FF6B6B);
    transition: width var(--transition-fast);
}

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

.navbar-link:hover::after,
.navbar-link.active::after {
    width: 100%;
}

.navbar-submenu {
    position: absolute;
    top: calc(100% + 16px);
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    opacity: 0;
    visibility: hidden;
    list-style: none;
    min-width: 240px;
    background: rgba(0, 16, 70, 0.95);
    backdrop-filter: blur(18px);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-floating);
    transition: opacity var(--transition-fast), transform var(--transition-fast);
    padding: var(--spacing-sm) 0;
}

.navbar-item:hover .navbar-submenu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.navbar-submenu-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    color: rgba(240, 248, 255, 0.85);
    transition: background var(--transition-fast), color var(--transition-fast);
    font-size: var(--font-size-sm);
}

.navbar-submenu-link:hover {
    background: rgba(240, 248, 255, 0.08);
    color: var(--color-text-on-primary);
}

.navbar-toggle {
    display: none;
    margin-left: auto;
    background: rgba(240, 248, 255, 0.12);
    border: none;
    color: var(--color-text-on-primary);
    width: 44px;
    height: 44px;
    border-radius: var(--border-radius-md);
    font-size: 1.5rem;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.navbar-toggle:hover {
    background: rgba(240, 248, 255, 0.18);
}

@media (max-width: 992px) {
    .navbar-menu {
        position: fixed;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        background: rgba(1, 8, 46, 0.98);
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-slow);
        margin-left: 0;
    }

    .navbar-menu.active {
        max-height: 90vh;
    }

    .navbar-item {
        border-bottom: 1px solid rgba(240, 248, 255, 0.06);
    }

    .navbar-link {
        padding: 18px var(--container-padding);
    }

    .navbar-link::after {
        left: var(--container-padding);
    }

    .navbar-submenu {
        position: static;
        transform: none;
        max-height: 0;
        opacity: 0;
        visibility: hidden;
        border-radius: 0;
        background: rgba(0, 0, 0, 0.18);
        box-shadow: none;
        padding: 0;
    }

    .navbar-item.active .navbar-submenu {
        max-height: 420px;
        opacity: 1;
        visibility: visible;
    }

    .navbar-submenu-link {
        padding: 16px calc(var(--container-padding) + 32px);
    }

    .navbar-toggle {
        display: inline-flex;
        justify-content: center;
        align-items: center;
    }
}

/* ========== 页面主体 ========== */
main {
    margin-top: var(--navbar-height);
}

.page-section {
    position: relative;
    padding: var(--spacing-4xl) 0;
}

.page-section.light {
    background: var(--color-surface);
}

.page-section.dark {
    background: linear-gradient(180deg, #020B26 0%, #081A3E 100%);
    color: var(--color-text-on-primary);
}

.page-section.ocean {
    background: radial-gradient(circle at 20% 20%, rgba(30, 61, 143, 0.45), rgba(0, 8, 64, 0.92));
    color: var(--color-text-on-primary);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title h2 {
    color: inherit;
    margin-bottom: var(--spacing-sm);
}

.section-title p {
    color: inherit;
    opacity: 0.75;
    max-width: 720px;
    margin: 0 auto;
}

/* ========== 波浪装饰 ========== */
.wave-container {
    position: relative;
    overflow: hidden;
}

.wave-container::after,
.wave-container::before {
    content: '';
    position: absolute;
    left: 0;
    width: 200%;
    height: 140px;
    background-repeat: repeat-x;
    background-size: 50% 140px;
    opacity: 0.5;
    animation: waveMotion 18s linear infinite;
}

.wave-container::before {
    top: 0;
    background-image: radial-gradient(circle at 50% 80%, rgba(240, 248, 255, 0.85), rgba(240, 248, 255, 0));
}

.wave-container::after {
    bottom: 0;
    animation-duration: 28s;
    background-image: radial-gradient(circle at 50% 20%, rgba(0, 16, 70, 0.22), rgba(0, 16, 70, 0));
}

/* ========== 英雄区 ========== */
.hero {
    position: relative;
    padding: calc(var(--spacing-5xl) + var(--navbar-height)) 0 var(--spacing-4xl);
    background: radial-gradient(circle at 20% 20%, rgba(30, 61, 143, 0.55), rgba(0, 8, 64, 0.95));
    color: var(--color-text-on-primary);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url('../images/img_12.jpg') center/cover no-repeat;
    mix-blend-mode: soft-light;
    opacity: 0.45;
}

.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 80% 20%, rgba(220, 20, 60, 0.25), transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 880px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.hero-headline {
    font-size: clamp(2.5rem, 5vw, 3.75rem);
    line-height: 1.1;
    color: inherit;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: rgba(240, 248, 255, 0.8);
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

.hero-meta {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-xxl);
    margin-top: var(--spacing-3xl);
}

.hero-meta-block {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    color: rgba(240, 248, 255, 0.78);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: var(--font-size-sm);
}

.hero-meta-block strong {
    font-size: 2.25rem;
    color: var(--color-text-on-primary);
    letter-spacing: normal;
}

.hero-video {
    margin: var(--spacing-4xl) auto 0;
    max-width: 880px;
    position: relative;
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-floating);
}

.hero-video::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0) 40%, rgba(0, 0, 0, 0.65) 100%);
}

.hero-video img,
.hero-video video {
    width: 100%;
    display: block;
}

.hero-video button {
    position: absolute;
    inset: auto 50% 24px 50%;
    transform: translateX(-50%);
    z-index: 2;
}

/* ========== 页脚 ========== */
footer {
    background: linear-gradient(180deg, #020B26 0%, #00051A 100%);
    color: var(--footer-text-color);
    padding: var(--spacing-4xl) var(--container-padding) var(--spacing-xl);
    margin-top: var(--spacing-4xl);
}

.footer-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    color: inherit;
}

.footer-brand span {
    color: inherit;
    font-size: var(--font-size-sm);
    opacity: 0.7;
    line-height: 1.6;
}

.footer-section h4 {
    color: var(--color-text-on-primary);
    margin-bottom: var(--spacing-md);
}

.footer-section ul {
    list-style: none;
    display: grid;
    gap: var(--spacing-sm);
    color: rgba(240, 248, 255, 0.75);
}

.footer-section a {
    color: inherit;
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: var(--color-accent);
}

.footer-meta {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(240, 248, 255, 0.08);
    font-size: var(--font-size-sm);
    color: rgba(240, 248, 255, 0.55);
}

.footer-meta a {
    color: inherit;
}

.footer-meta a:hover {
    color: var(--color-text-on-primary);
}

@media (max-width: 768px) {
    .page-section {
        padding: var(--spacing-3xl) 0;
    }

    .hero {
        padding-top: calc(var(--spacing-4xl) + var(--navbar-height));
    }

    .hero-meta {
        gap: var(--spacing-xl);
    }

    footer {
        text-align: left;
    }

    .footer-meta {
        flex-direction: column;
        align-items: flex-start;
    }
}