/* ===================================
   星图AI产品官网 - 布局样式
   版本：v2.0
   职责：容器布局、网格系统、导航栏
   =================================== */

/* ===================================
   1. 布局容器与网格系统
   =================================== */
.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--spacing-container);
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-card);
}

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

/* ===================================
   2. 导航栏样式
   =================================== */
.header {
    background-color: var(--color-bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo__img {
    width: 40px;
    height: 40px;
}

.logo__text {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-primary);
}

.nav__list {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav__link {
    color: var(--color-text-primary);
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    position: relative;
}

.nav__link:hover {
    color: var(--color-primary);
    background-color: var(--color-bg-card);
}

.nav__link--cta {
    background-color: var(--color-primary);
    color: var(--color-bg-white);
}

.nav__link--cta:hover {
    background-color: var(--color-secondary);
    color: var(--color-bg-white);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background-color: var(--color-text-primary);
    transition: var(--transition-fast);
}