/* =========================
   Shared Navigation
   For index / projects / about
========================= */

/* 全局基础 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.nav-container {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 2000;
    min-width: 190px;
}

.brand-trigger {
    background: transparent;
    border: none;
    color: #2f2f2f;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 17px;
    font-weight: 500;
    line-height: 1.1;
    letter-spacing: 0.01em;
    text-align: left;
    cursor: pointer;
    outline: none;
    padding: 0;
    transition: opacity 0.25s ease;
}

.brand-trigger:hover {
    opacity: 0.6;
}

.brand-lines {
    display: inline-block;
    text-align: left;
    line-height: 1.1;
}

.menu-panel {
    position: relative;
    margin-top: 15px;
    margin-left: 12px;   /* 向右移一点 */
    min-width: 200px;
    background: transparent;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
}

.nav-container.open .menu-panel {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.menu-panel ul {
    list-style: none;
}

.menu-panel a {
    display: block;
    position: relative;
    padding: 10px 0;
    color: #2f2f2f;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 15px;
    font-weight: 400;
    letter-spacing: 0.06em;
    text-decoration: none;
    transition: color 0.2s ease;
}

.menu-panel a:hover {
    color: #777;
}

.menu-panel a.active-page::after {
    content: '';
    position: absolute;
    right: 120px;
    top: 50%;
    transform: translateY(-50%);
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: currentColor;
}

@media (max-width: 768px) {
    .nav-container {
        top: 15px;
        left: 5%;
        width: 90%;
        min-width: 0;
    }

    .brand-trigger {
        font-size: 15px;
    }

    .menu-panel {
        margin-top: 14px;
        min-width: 0;
    }

    .menu-panel a {
        font-size: 14px;
        padding: 8px 0;
    }
}