body {
    font-family: 'Inter', 'Noto Sans TC', sans-serif;
    background-color: #0F1115;
    color: #E5E7EB;
}
.nav-active {
    border-bottom-color: #C77D56;
    color: #E0DACE;
    font-weight: 600;
}
.nav-inactive {
    border-bottom-color: transparent;
    color: #9CA3AF;
}
.modal-backdrop {
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(6px);
}
.table-header {
    background-color: #1F2937;
}
.table-row-odd {
    background-color: #151A21;
}
.table-row-even {
    background-color: #0F141A;
}
.diagram-node {
    padding: 0.5rem;
    border-width: 1px;
    border-radius: 0.375rem;
    text-align: center;
    background-color: #11161D;
    border-color: #2A333F;
    box-shadow: 0 4px 10px 0 rgb(0 0 0 / 0.45), 0 1px 2px -1px rgb(0 0 0 / 0.3);
    min-width: 100px;
}
.connector-v {
    width: 2px;
    margin-left: auto;
    margin-right: auto;
    background-color: #4B5563; /* slate-600 */
}
.connector-h {
    flex-grow: 1;
    height: 2px;
    background-color: #4B5563; /* slate-600 */
}
.annotation {
    font-size: 0.75rem;
    color: #9CA3AF; /* gray-400 */
    background-color: #0F1115;
    padding: 0 0.25rem;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    white-space: nowrap;
}
.page-nav {
    background-color: #1A1F29;
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 2rem;
}
.page-nav a {
    color: #E0DACE;
    text-decoration: none;
    font-weight: 500;
    margin-right: 1rem;
    padding: 0.5rem 1rem;
    border-radius: 0.25rem;
    transition: background-color 0.3s, color 0.3s;
}
.page-nav a:hover {
    background-color: #2A333F;
}
.page-nav a.active {
    background-color: #C77D56;
    color: white;
}

/* Reading enhancements */
.indent-2em {
    text-indent: 2em;
}
.reading-container {
    max-width: 72ch;
    margin-left: auto;
    margin-right: auto;
}

/* Dark cards for overview */
.card-dark {
    background-color: #11161D;
    border: 1px solid #2A333F;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.card-dark:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.5), 0 0 18px rgba(199, 125, 86, 0.25);
    border-color: #3A4656;
}
.card-title {
    color: #F3F4F6; /* 高對比標題 */
}
.card-subtitle {
    color: #D1D5DB; /* 次要資訊，仍保有對比 */
}